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Example for the LPC4088 QSB Base Board
lodepng.cpp@3:15f457b3bdbd, 2014-04-09 (annotated)
- Committer:
- embeddedartists
- Date:
- Wed Apr 09 09:44:58 2014 +0000
- Revision:
- 3:15f457b3bdbd
- Parent:
- 0:a771927a62fd
Updated to latest version of EALib
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
embeddedartists | 0:a771927a62fd | 1 | /* |
embeddedartists | 0:a771927a62fd | 2 | LodePNG version 20131222 |
embeddedartists | 0:a771927a62fd | 3 | |
embeddedartists | 0:a771927a62fd | 4 | Copyright (c) 2005-2013 Lode Vandevenne |
embeddedartists | 0:a771927a62fd | 5 | |
embeddedartists | 0:a771927a62fd | 6 | This software is provided 'as-is', without any express or implied |
embeddedartists | 0:a771927a62fd | 7 | warranty. In no event will the authors be held liable for any damages |
embeddedartists | 0:a771927a62fd | 8 | arising from the use of this software. |
embeddedartists | 0:a771927a62fd | 9 | |
embeddedartists | 0:a771927a62fd | 10 | Permission is granted to anyone to use this software for any purpose, |
embeddedartists | 0:a771927a62fd | 11 | including commercial applications, and to alter it and redistribute it |
embeddedartists | 0:a771927a62fd | 12 | freely, subject to the following restrictions: |
embeddedartists | 0:a771927a62fd | 13 | |
embeddedartists | 0:a771927a62fd | 14 | 1. The origin of this software must not be misrepresented; you must not |
embeddedartists | 0:a771927a62fd | 15 | claim that you wrote the original software. If you use this software |
embeddedartists | 0:a771927a62fd | 16 | in a product, an acknowledgment in the product documentation would be |
embeddedartists | 0:a771927a62fd | 17 | appreciated but is not required. |
embeddedartists | 0:a771927a62fd | 18 | |
embeddedartists | 0:a771927a62fd | 19 | 2. Altered source versions must be plainly marked as such, and must not be |
embeddedartists | 0:a771927a62fd | 20 | misrepresented as being the original software. |
embeddedartists | 0:a771927a62fd | 21 | |
embeddedartists | 0:a771927a62fd | 22 | 3. This notice may not be removed or altered from any source |
embeddedartists | 0:a771927a62fd | 23 | distribution. |
embeddedartists | 0:a771927a62fd | 24 | */ |
embeddedartists | 0:a771927a62fd | 25 | |
embeddedartists | 0:a771927a62fd | 26 | /* |
embeddedartists | 0:a771927a62fd | 27 | The manual and changelog are in the header file "lodepng.h" |
embeddedartists | 0:a771927a62fd | 28 | Rename this file to lodepng.cpp to use it for C++, or to lodepng.c to use it for C. |
embeddedartists | 0:a771927a62fd | 29 | */ |
embeddedartists | 0:a771927a62fd | 30 | |
embeddedartists | 0:a771927a62fd | 31 | #include "lodepng.h" |
embeddedartists | 0:a771927a62fd | 32 | |
embeddedartists | 0:a771927a62fd | 33 | #include <stdio.h> |
embeddedartists | 0:a771927a62fd | 34 | #include <stdlib.h> |
embeddedartists | 0:a771927a62fd | 35 | |
embeddedartists | 0:a771927a62fd | 36 | #ifdef LODEPNG_COMPILE_CPP |
embeddedartists | 0:a771927a62fd | 37 | #include <fstream> |
embeddedartists | 0:a771927a62fd | 38 | #endif /*LODEPNG_COMPILE_CPP*/ |
embeddedartists | 0:a771927a62fd | 39 | |
embeddedartists | 0:a771927a62fd | 40 | #define VERSION_STRING "20131222" |
embeddedartists | 0:a771927a62fd | 41 | |
embeddedartists | 0:a771927a62fd | 42 | /* |
embeddedartists | 0:a771927a62fd | 43 | This source file is built up in the following large parts. The code sections |
embeddedartists | 0:a771927a62fd | 44 | with the "LODEPNG_COMPILE_" #defines divide this up further in an intermixed way. |
embeddedartists | 0:a771927a62fd | 45 | -Tools for C and common code for PNG and Zlib |
embeddedartists | 0:a771927a62fd | 46 | -C Code for Zlib (huffman, deflate, ...) |
embeddedartists | 0:a771927a62fd | 47 | -C Code for PNG (file format chunks, adam7, PNG filters, color conversions, ...) |
embeddedartists | 0:a771927a62fd | 48 | -The C++ wrapper around all of the above |
embeddedartists | 0:a771927a62fd | 49 | */ |
embeddedartists | 0:a771927a62fd | 50 | |
embeddedartists | 0:a771927a62fd | 51 | /*The malloc, realloc and free functions defined here with "lodepng_" in front |
embeddedartists | 0:a771927a62fd | 52 | of the name, so that you can easily change them to others related to your |
embeddedartists | 0:a771927a62fd | 53 | platform if needed. Everything else in the code calls these. Pass |
embeddedartists | 0:a771927a62fd | 54 | -DLODEPNG_NO_COMPILE_ALLOCATORS to the compiler, or comment out |
embeddedartists | 0:a771927a62fd | 55 | #define LODEPNG_COMPILE_ALLOCATORS in the header, to disable the ones here and |
embeddedartists | 0:a771927a62fd | 56 | define them in your own project's source files without needing to change |
embeddedartists | 0:a771927a62fd | 57 | lodepng source code. Don't forget to remove "static" if you copypaste them |
embeddedartists | 0:a771927a62fd | 58 | from here.*/ |
embeddedartists | 0:a771927a62fd | 59 | |
embeddedartists | 0:a771927a62fd | 60 | #ifdef LODEPNG_COMPILE_ALLOCATORS |
embeddedartists | 0:a771927a62fd | 61 | static void* lodepng_malloc(size_t size) |
embeddedartists | 0:a771927a62fd | 62 | { |
embeddedartists | 0:a771927a62fd | 63 | return malloc(size); |
embeddedartists | 0:a771927a62fd | 64 | } |
embeddedartists | 0:a771927a62fd | 65 | |
embeddedartists | 0:a771927a62fd | 66 | static void* lodepng_realloc(void* ptr, size_t new_size) |
embeddedartists | 0:a771927a62fd | 67 | { |
embeddedartists | 0:a771927a62fd | 68 | return realloc(ptr, new_size); |
embeddedartists | 0:a771927a62fd | 69 | } |
embeddedartists | 0:a771927a62fd | 70 | |
embeddedartists | 0:a771927a62fd | 71 | static void lodepng_free(void* ptr) |
embeddedartists | 0:a771927a62fd | 72 | { |
embeddedartists | 0:a771927a62fd | 73 | free(ptr); |
embeddedartists | 0:a771927a62fd | 74 | } |
embeddedartists | 0:a771927a62fd | 75 | #else /*LODEPNG_COMPILE_ALLOCATORS*/ |
embeddedartists | 0:a771927a62fd | 76 | void* lodepng_malloc(size_t size); |
embeddedartists | 0:a771927a62fd | 77 | void* lodepng_realloc(void* ptr, size_t new_size); |
embeddedartists | 0:a771927a62fd | 78 | void lodepng_free(void* ptr); |
embeddedartists | 0:a771927a62fd | 79 | #endif /*LODEPNG_COMPILE_ALLOCATORS*/ |
embeddedartists | 0:a771927a62fd | 80 | |
embeddedartists | 0:a771927a62fd | 81 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 82 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 83 | /* // Tools for C, and common code for PNG and Zlib. // */ |
embeddedartists | 0:a771927a62fd | 84 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 85 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 86 | |
embeddedartists | 0:a771927a62fd | 87 | /* |
embeddedartists | 0:a771927a62fd | 88 | Often in case of an error a value is assigned to a variable and then it breaks |
embeddedartists | 0:a771927a62fd | 89 | out of a loop (to go to the cleanup phase of a function). This macro does that. |
embeddedartists | 0:a771927a62fd | 90 | It makes the error handling code shorter and more readable. |
embeddedartists | 0:a771927a62fd | 91 | |
embeddedartists | 0:a771927a62fd | 92 | Example: if(!uivector_resizev(&frequencies_ll, 286, 0)) ERROR_BREAK(83); |
embeddedartists | 0:a771927a62fd | 93 | */ |
embeddedartists | 0:a771927a62fd | 94 | #define CERROR_BREAK(errorvar, code)\ |
embeddedartists | 0:a771927a62fd | 95 | {\ |
embeddedartists | 0:a771927a62fd | 96 | errorvar = code;\ |
embeddedartists | 0:a771927a62fd | 97 | break;\ |
embeddedartists | 0:a771927a62fd | 98 | } |
embeddedartists | 0:a771927a62fd | 99 | |
embeddedartists | 0:a771927a62fd | 100 | /*version of CERROR_BREAK that assumes the common case where the error variable is named "error"*/ |
embeddedartists | 0:a771927a62fd | 101 | #define ERROR_BREAK(code) CERROR_BREAK(error, code) |
embeddedartists | 0:a771927a62fd | 102 | |
embeddedartists | 0:a771927a62fd | 103 | /*Set error var to the error code, and return it.*/ |
embeddedartists | 0:a771927a62fd | 104 | #define CERROR_RETURN_ERROR(errorvar, code)\ |
embeddedartists | 0:a771927a62fd | 105 | {\ |
embeddedartists | 0:a771927a62fd | 106 | errorvar = code;\ |
embeddedartists | 0:a771927a62fd | 107 | return code;\ |
embeddedartists | 0:a771927a62fd | 108 | } |
embeddedartists | 0:a771927a62fd | 109 | |
embeddedartists | 0:a771927a62fd | 110 | /*Try the code, if it returns error, also return the error.*/ |
embeddedartists | 0:a771927a62fd | 111 | #define CERROR_TRY_RETURN(call)\ |
embeddedartists | 0:a771927a62fd | 112 | {\ |
embeddedartists | 0:a771927a62fd | 113 | unsigned error = call;\ |
embeddedartists | 0:a771927a62fd | 114 | if(error) return error;\ |
embeddedartists | 0:a771927a62fd | 115 | } |
embeddedartists | 0:a771927a62fd | 116 | |
embeddedartists | 0:a771927a62fd | 117 | /* |
embeddedartists | 0:a771927a62fd | 118 | About uivector, ucvector and string: |
embeddedartists | 0:a771927a62fd | 119 | -All of them wrap dynamic arrays or text strings in a similar way. |
embeddedartists | 0:a771927a62fd | 120 | -LodePNG was originally written in C++. The vectors replace the std::vectors that were used in the C++ version. |
embeddedartists | 0:a771927a62fd | 121 | -The string tools are made to avoid problems with compilers that declare things like strncat as deprecated. |
embeddedartists | 0:a771927a62fd | 122 | -They're not used in the interface, only internally in this file as static functions. |
embeddedartists | 0:a771927a62fd | 123 | -As with many other structs in this file, the init and cleanup functions serve as ctor and dtor. |
embeddedartists | 0:a771927a62fd | 124 | */ |
embeddedartists | 0:a771927a62fd | 125 | |
embeddedartists | 0:a771927a62fd | 126 | #ifdef LODEPNG_COMPILE_ZLIB |
embeddedartists | 0:a771927a62fd | 127 | /*dynamic vector of unsigned ints*/ |
embeddedartists | 0:a771927a62fd | 128 | typedef struct uivector |
embeddedartists | 0:a771927a62fd | 129 | { |
embeddedartists | 0:a771927a62fd | 130 | unsigned* data; |
embeddedartists | 0:a771927a62fd | 131 | size_t size; /*size in number of unsigned longs*/ |
embeddedartists | 0:a771927a62fd | 132 | size_t allocsize; /*allocated size in bytes*/ |
embeddedartists | 0:a771927a62fd | 133 | } uivector; |
embeddedartists | 0:a771927a62fd | 134 | |
embeddedartists | 0:a771927a62fd | 135 | static void uivector_cleanup(void* p) |
embeddedartists | 0:a771927a62fd | 136 | { |
embeddedartists | 0:a771927a62fd | 137 | ((uivector*)p)->size = ((uivector*)p)->allocsize = 0; |
embeddedartists | 0:a771927a62fd | 138 | lodepng_free(((uivector*)p)->data); |
embeddedartists | 0:a771927a62fd | 139 | ((uivector*)p)->data = NULL; |
embeddedartists | 0:a771927a62fd | 140 | } |
embeddedartists | 0:a771927a62fd | 141 | |
embeddedartists | 0:a771927a62fd | 142 | /*returns 1 if success, 0 if failure ==> nothing done*/ |
embeddedartists | 0:a771927a62fd | 143 | static unsigned uivector_resize(uivector* p, size_t size) |
embeddedartists | 0:a771927a62fd | 144 | { |
embeddedartists | 0:a771927a62fd | 145 | if(size * sizeof(unsigned) > p->allocsize) |
embeddedartists | 0:a771927a62fd | 146 | { |
embeddedartists | 0:a771927a62fd | 147 | size_t newsize = size * sizeof(unsigned) * 2; |
embeddedartists | 0:a771927a62fd | 148 | void* data = lodepng_realloc(p->data, newsize); |
embeddedartists | 0:a771927a62fd | 149 | if(data) |
embeddedartists | 0:a771927a62fd | 150 | { |
embeddedartists | 0:a771927a62fd | 151 | p->allocsize = newsize; |
embeddedartists | 0:a771927a62fd | 152 | p->data = (unsigned*)data; |
embeddedartists | 0:a771927a62fd | 153 | p->size = size; |
embeddedartists | 0:a771927a62fd | 154 | } |
embeddedartists | 0:a771927a62fd | 155 | else return 0; |
embeddedartists | 0:a771927a62fd | 156 | } |
embeddedartists | 0:a771927a62fd | 157 | else p->size = size; |
embeddedartists | 0:a771927a62fd | 158 | return 1; |
embeddedartists | 0:a771927a62fd | 159 | } |
embeddedartists | 0:a771927a62fd | 160 | |
embeddedartists | 0:a771927a62fd | 161 | /*resize and give all new elements the value*/ |
embeddedartists | 0:a771927a62fd | 162 | static unsigned uivector_resizev(uivector* p, size_t size, unsigned value) |
embeddedartists | 0:a771927a62fd | 163 | { |
embeddedartists | 0:a771927a62fd | 164 | size_t oldsize = p->size, i; |
embeddedartists | 0:a771927a62fd | 165 | if(!uivector_resize(p, size)) return 0; |
embeddedartists | 0:a771927a62fd | 166 | for(i = oldsize; i < size; i++) p->data[i] = value; |
embeddedartists | 0:a771927a62fd | 167 | return 1; |
embeddedartists | 0:a771927a62fd | 168 | } |
embeddedartists | 0:a771927a62fd | 169 | |
embeddedartists | 0:a771927a62fd | 170 | static void uivector_init(uivector* p) |
embeddedartists | 0:a771927a62fd | 171 | { |
embeddedartists | 0:a771927a62fd | 172 | p->data = NULL; |
embeddedartists | 0:a771927a62fd | 173 | p->size = p->allocsize = 0; |
embeddedartists | 0:a771927a62fd | 174 | } |
embeddedartists | 0:a771927a62fd | 175 | |
embeddedartists | 0:a771927a62fd | 176 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 177 | /*returns 1 if success, 0 if failure ==> nothing done*/ |
embeddedartists | 0:a771927a62fd | 178 | static unsigned uivector_push_back(uivector* p, unsigned c) |
embeddedartists | 0:a771927a62fd | 179 | { |
embeddedartists | 0:a771927a62fd | 180 | if(!uivector_resize(p, p->size + 1)) return 0; |
embeddedartists | 0:a771927a62fd | 181 | p->data[p->size - 1] = c; |
embeddedartists | 0:a771927a62fd | 182 | return 1; |
embeddedartists | 0:a771927a62fd | 183 | } |
embeddedartists | 0:a771927a62fd | 184 | |
embeddedartists | 0:a771927a62fd | 185 | /*copy q to p, returns 1 if success, 0 if failure ==> nothing done*/ |
embeddedartists | 0:a771927a62fd | 186 | static unsigned uivector_copy(uivector* p, const uivector* q) |
embeddedartists | 0:a771927a62fd | 187 | { |
embeddedartists | 0:a771927a62fd | 188 | size_t i; |
embeddedartists | 0:a771927a62fd | 189 | if(!uivector_resize(p, q->size)) return 0; |
embeddedartists | 0:a771927a62fd | 190 | for(i = 0; i < q->size; i++) p->data[i] = q->data[i]; |
embeddedartists | 0:a771927a62fd | 191 | return 1; |
embeddedartists | 0:a771927a62fd | 192 | } |
embeddedartists | 0:a771927a62fd | 193 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 194 | #endif /*LODEPNG_COMPILE_ZLIB*/ |
embeddedartists | 0:a771927a62fd | 195 | |
embeddedartists | 0:a771927a62fd | 196 | /* /////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 197 | |
embeddedartists | 0:a771927a62fd | 198 | /*dynamic vector of unsigned chars*/ |
embeddedartists | 0:a771927a62fd | 199 | typedef struct ucvector |
embeddedartists | 0:a771927a62fd | 200 | { |
embeddedartists | 0:a771927a62fd | 201 | unsigned char* data; |
embeddedartists | 0:a771927a62fd | 202 | size_t size; /*used size*/ |
embeddedartists | 0:a771927a62fd | 203 | size_t allocsize; /*allocated size*/ |
embeddedartists | 0:a771927a62fd | 204 | } ucvector; |
embeddedartists | 0:a771927a62fd | 205 | |
embeddedartists | 0:a771927a62fd | 206 | /*returns 1 if success, 0 if failure ==> nothing done*/ |
embeddedartists | 0:a771927a62fd | 207 | static unsigned ucvector_resize(ucvector* p, size_t size) |
embeddedartists | 0:a771927a62fd | 208 | { |
embeddedartists | 0:a771927a62fd | 209 | if(size * sizeof(unsigned char) > p->allocsize) |
embeddedartists | 0:a771927a62fd | 210 | { |
embeddedartists | 0:a771927a62fd | 211 | size_t newsize = size * sizeof(unsigned char) * 2; |
embeddedartists | 0:a771927a62fd | 212 | void* data = lodepng_realloc(p->data, newsize); |
embeddedartists | 0:a771927a62fd | 213 | if(data) |
embeddedartists | 0:a771927a62fd | 214 | { |
embeddedartists | 0:a771927a62fd | 215 | p->allocsize = newsize; |
embeddedartists | 0:a771927a62fd | 216 | p->data = (unsigned char*)data; |
embeddedartists | 0:a771927a62fd | 217 | p->size = size; |
embeddedartists | 0:a771927a62fd | 218 | } |
embeddedartists | 0:a771927a62fd | 219 | else return 0; /*error: not enough memory*/ |
embeddedartists | 0:a771927a62fd | 220 | } |
embeddedartists | 0:a771927a62fd | 221 | else p->size = size; |
embeddedartists | 0:a771927a62fd | 222 | return 1; |
embeddedartists | 0:a771927a62fd | 223 | } |
embeddedartists | 0:a771927a62fd | 224 | |
embeddedartists | 0:a771927a62fd | 225 | #ifdef LODEPNG_COMPILE_PNG |
embeddedartists | 0:a771927a62fd | 226 | |
embeddedartists | 0:a771927a62fd | 227 | static void ucvector_cleanup(void* p) |
embeddedartists | 0:a771927a62fd | 228 | { |
embeddedartists | 0:a771927a62fd | 229 | ((ucvector*)p)->size = ((ucvector*)p)->allocsize = 0; |
embeddedartists | 0:a771927a62fd | 230 | lodepng_free(((ucvector*)p)->data); |
embeddedartists | 0:a771927a62fd | 231 | ((ucvector*)p)->data = NULL; |
embeddedartists | 0:a771927a62fd | 232 | } |
embeddedartists | 0:a771927a62fd | 233 | |
embeddedartists | 0:a771927a62fd | 234 | static void ucvector_init(ucvector* p) |
embeddedartists | 0:a771927a62fd | 235 | { |
embeddedartists | 0:a771927a62fd | 236 | p->data = NULL; |
embeddedartists | 0:a771927a62fd | 237 | p->size = p->allocsize = 0; |
embeddedartists | 0:a771927a62fd | 238 | } |
embeddedartists | 0:a771927a62fd | 239 | |
embeddedartists | 0:a771927a62fd | 240 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 241 | /*resize and give all new elements the value*/ |
embeddedartists | 0:a771927a62fd | 242 | static unsigned ucvector_resizev(ucvector* p, size_t size, unsigned char value) |
embeddedartists | 0:a771927a62fd | 243 | { |
embeddedartists | 0:a771927a62fd | 244 | size_t oldsize = p->size, i; |
embeddedartists | 0:a771927a62fd | 245 | if(!ucvector_resize(p, size)) return 0; |
embeddedartists | 0:a771927a62fd | 246 | for(i = oldsize; i < size; i++) p->data[i] = value; |
embeddedartists | 0:a771927a62fd | 247 | return 1; |
embeddedartists | 0:a771927a62fd | 248 | } |
embeddedartists | 0:a771927a62fd | 249 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 250 | #endif /*LODEPNG_COMPILE_PNG*/ |
embeddedartists | 0:a771927a62fd | 251 | |
embeddedartists | 0:a771927a62fd | 252 | #ifdef LODEPNG_COMPILE_ZLIB |
embeddedartists | 0:a771927a62fd | 253 | /*you can both convert from vector to buffer&size and vica versa. If you use |
embeddedartists | 0:a771927a62fd | 254 | init_buffer to take over a buffer and size, it is not needed to use cleanup*/ |
embeddedartists | 0:a771927a62fd | 255 | static void ucvector_init_buffer(ucvector* p, unsigned char* buffer, size_t size) |
embeddedartists | 0:a771927a62fd | 256 | { |
embeddedartists | 0:a771927a62fd | 257 | p->data = buffer; |
embeddedartists | 0:a771927a62fd | 258 | p->allocsize = p->size = size; |
embeddedartists | 0:a771927a62fd | 259 | } |
embeddedartists | 0:a771927a62fd | 260 | #endif /*LODEPNG_COMPILE_ZLIB*/ |
embeddedartists | 0:a771927a62fd | 261 | |
embeddedartists | 0:a771927a62fd | 262 | #if (defined(LODEPNG_COMPILE_PNG) && defined(LODEPNG_COMPILE_ANCILLARY_CHUNKS)) || defined(LODEPNG_COMPILE_ENCODER) |
embeddedartists | 0:a771927a62fd | 263 | /*returns 1 if success, 0 if failure ==> nothing done*/ |
embeddedartists | 0:a771927a62fd | 264 | static unsigned ucvector_push_back(ucvector* p, unsigned char c) |
embeddedartists | 0:a771927a62fd | 265 | { |
embeddedartists | 0:a771927a62fd | 266 | if(!ucvector_resize(p, p->size + 1)) return 0; |
embeddedartists | 0:a771927a62fd | 267 | p->data[p->size - 1] = c; |
embeddedartists | 0:a771927a62fd | 268 | return 1; |
embeddedartists | 0:a771927a62fd | 269 | } |
embeddedartists | 0:a771927a62fd | 270 | #endif /*defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER)*/ |
embeddedartists | 0:a771927a62fd | 271 | |
embeddedartists | 0:a771927a62fd | 272 | |
embeddedartists | 0:a771927a62fd | 273 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 274 | |
embeddedartists | 0:a771927a62fd | 275 | #ifdef LODEPNG_COMPILE_PNG |
embeddedartists | 0:a771927a62fd | 276 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 277 | /*returns 1 if success, 0 if failure ==> nothing done*/ |
embeddedartists | 0:a771927a62fd | 278 | static unsigned string_resize(char** out, size_t size) |
embeddedartists | 0:a771927a62fd | 279 | { |
embeddedartists | 0:a771927a62fd | 280 | char* data = (char*)lodepng_realloc(*out, size + 1); |
embeddedartists | 0:a771927a62fd | 281 | if(data) |
embeddedartists | 0:a771927a62fd | 282 | { |
embeddedartists | 0:a771927a62fd | 283 | data[size] = 0; /*null termination char*/ |
embeddedartists | 0:a771927a62fd | 284 | *out = data; |
embeddedartists | 0:a771927a62fd | 285 | } |
embeddedartists | 0:a771927a62fd | 286 | return data != 0; |
embeddedartists | 0:a771927a62fd | 287 | } |
embeddedartists | 0:a771927a62fd | 288 | |
embeddedartists | 0:a771927a62fd | 289 | /*init a {char*, size_t} pair for use as string*/ |
embeddedartists | 0:a771927a62fd | 290 | static void string_init(char** out) |
embeddedartists | 0:a771927a62fd | 291 | { |
embeddedartists | 0:a771927a62fd | 292 | *out = NULL; |
embeddedartists | 0:a771927a62fd | 293 | string_resize(out, 0); |
embeddedartists | 0:a771927a62fd | 294 | } |
embeddedartists | 0:a771927a62fd | 295 | |
embeddedartists | 0:a771927a62fd | 296 | /*free the above pair again*/ |
embeddedartists | 0:a771927a62fd | 297 | static void string_cleanup(char** out) |
embeddedartists | 0:a771927a62fd | 298 | { |
embeddedartists | 0:a771927a62fd | 299 | lodepng_free(*out); |
embeddedartists | 0:a771927a62fd | 300 | *out = NULL; |
embeddedartists | 0:a771927a62fd | 301 | } |
embeddedartists | 0:a771927a62fd | 302 | |
embeddedartists | 0:a771927a62fd | 303 | static void string_set(char** out, const char* in) |
embeddedartists | 0:a771927a62fd | 304 | { |
embeddedartists | 0:a771927a62fd | 305 | size_t insize = strlen(in), i = 0; |
embeddedartists | 0:a771927a62fd | 306 | if(string_resize(out, insize)) |
embeddedartists | 0:a771927a62fd | 307 | { |
embeddedartists | 0:a771927a62fd | 308 | for(i = 0; i < insize; i++) |
embeddedartists | 0:a771927a62fd | 309 | { |
embeddedartists | 0:a771927a62fd | 310 | (*out)[i] = in[i]; |
embeddedartists | 0:a771927a62fd | 311 | } |
embeddedartists | 0:a771927a62fd | 312 | } |
embeddedartists | 0:a771927a62fd | 313 | } |
embeddedartists | 0:a771927a62fd | 314 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 315 | #endif /*LODEPNG_COMPILE_PNG*/ |
embeddedartists | 0:a771927a62fd | 316 | |
embeddedartists | 0:a771927a62fd | 317 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 318 | |
embeddedartists | 0:a771927a62fd | 319 | unsigned lodepng_read32bitInt(const unsigned char* buffer) |
embeddedartists | 0:a771927a62fd | 320 | { |
embeddedartists | 0:a771927a62fd | 321 | return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]; |
embeddedartists | 0:a771927a62fd | 322 | } |
embeddedartists | 0:a771927a62fd | 323 | |
embeddedartists | 0:a771927a62fd | 324 | #if defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER) |
embeddedartists | 0:a771927a62fd | 325 | /*buffer must have at least 4 allocated bytes available*/ |
embeddedartists | 0:a771927a62fd | 326 | static void lodepng_set32bitInt(unsigned char* buffer, unsigned value) |
embeddedartists | 0:a771927a62fd | 327 | { |
embeddedartists | 0:a771927a62fd | 328 | buffer[0] = (unsigned char)((value >> 24) & 0xff); |
embeddedartists | 0:a771927a62fd | 329 | buffer[1] = (unsigned char)((value >> 16) & 0xff); |
embeddedartists | 0:a771927a62fd | 330 | buffer[2] = (unsigned char)((value >> 8) & 0xff); |
embeddedartists | 0:a771927a62fd | 331 | buffer[3] = (unsigned char)((value ) & 0xff); |
embeddedartists | 0:a771927a62fd | 332 | } |
embeddedartists | 0:a771927a62fd | 333 | #endif /*defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER)*/ |
embeddedartists | 0:a771927a62fd | 334 | |
embeddedartists | 0:a771927a62fd | 335 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 336 | static void lodepng_add32bitInt(ucvector* buffer, unsigned value) |
embeddedartists | 0:a771927a62fd | 337 | { |
embeddedartists | 0:a771927a62fd | 338 | ucvector_resize(buffer, buffer->size + 4); /*todo: give error if resize failed*/ |
embeddedartists | 0:a771927a62fd | 339 | lodepng_set32bitInt(&buffer->data[buffer->size - 4], value); |
embeddedartists | 0:a771927a62fd | 340 | } |
embeddedartists | 0:a771927a62fd | 341 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 342 | |
embeddedartists | 0:a771927a62fd | 343 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 344 | /* / File IO / */ |
embeddedartists | 0:a771927a62fd | 345 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 346 | |
embeddedartists | 0:a771927a62fd | 347 | #ifdef LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 348 | |
embeddedartists | 0:a771927a62fd | 349 | unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename) |
embeddedartists | 0:a771927a62fd | 350 | { |
embeddedartists | 0:a771927a62fd | 351 | FILE* file; |
embeddedartists | 0:a771927a62fd | 352 | long size; |
embeddedartists | 0:a771927a62fd | 353 | |
embeddedartists | 0:a771927a62fd | 354 | /*provide some proper output values if error will happen*/ |
embeddedartists | 0:a771927a62fd | 355 | *out = 0; |
embeddedartists | 0:a771927a62fd | 356 | *outsize = 0; |
embeddedartists | 0:a771927a62fd | 357 | |
embeddedartists | 0:a771927a62fd | 358 | file = fopen(filename, "rb"); |
embeddedartists | 0:a771927a62fd | 359 | if(!file) return 78; |
embeddedartists | 0:a771927a62fd | 360 | |
embeddedartists | 0:a771927a62fd | 361 | /*get filesize:*/ |
embeddedartists | 0:a771927a62fd | 362 | fseek(file , 0 , SEEK_END); |
embeddedartists | 0:a771927a62fd | 363 | size = ftell(file); |
embeddedartists | 0:a771927a62fd | 364 | rewind(file); |
embeddedartists | 0:a771927a62fd | 365 | |
embeddedartists | 0:a771927a62fd | 366 | /*read contents of the file into the vector*/ |
embeddedartists | 0:a771927a62fd | 367 | *outsize = 0; |
embeddedartists | 0:a771927a62fd | 368 | *out = (unsigned char*)lodepng_malloc((size_t)size); |
embeddedartists | 0:a771927a62fd | 369 | if(size && (*out)) (*outsize) = fread(*out, 1, (size_t)size, file); |
embeddedartists | 0:a771927a62fd | 370 | |
embeddedartists | 0:a771927a62fd | 371 | fclose(file); |
embeddedartists | 0:a771927a62fd | 372 | if(!(*out) && size) return 83; /*the above malloc failed*/ |
embeddedartists | 0:a771927a62fd | 373 | return 0; |
embeddedartists | 0:a771927a62fd | 374 | } |
embeddedartists | 0:a771927a62fd | 375 | |
embeddedartists | 0:a771927a62fd | 376 | /*write given buffer to the file, overwriting the file, it doesn't append to it.*/ |
embeddedartists | 0:a771927a62fd | 377 | unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename) |
embeddedartists | 0:a771927a62fd | 378 | { |
embeddedartists | 0:a771927a62fd | 379 | FILE* file; |
embeddedartists | 0:a771927a62fd | 380 | file = fopen(filename, "wb" ); |
embeddedartists | 0:a771927a62fd | 381 | if(!file) return 79; |
embeddedartists | 0:a771927a62fd | 382 | fwrite((char*)buffer , 1 , buffersize, file); |
embeddedartists | 0:a771927a62fd | 383 | fclose(file); |
embeddedartists | 0:a771927a62fd | 384 | return 0; |
embeddedartists | 0:a771927a62fd | 385 | } |
embeddedartists | 0:a771927a62fd | 386 | |
embeddedartists | 0:a771927a62fd | 387 | #endif /*LODEPNG_COMPILE_DISK*/ |
embeddedartists | 0:a771927a62fd | 388 | |
embeddedartists | 0:a771927a62fd | 389 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 390 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 391 | /* // End of common code and tools. Begin of Zlib related code. // */ |
embeddedartists | 0:a771927a62fd | 392 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 393 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 394 | |
embeddedartists | 0:a771927a62fd | 395 | #ifdef LODEPNG_COMPILE_ZLIB |
embeddedartists | 0:a771927a62fd | 396 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 397 | /*TODO: this ignores potential out of memory errors*/ |
embeddedartists | 0:a771927a62fd | 398 | #define addBitToStream(/*size_t**/ bitpointer, /*ucvector**/ bitstream, /*unsigned char*/ bit)\ |
embeddedartists | 0:a771927a62fd | 399 | {\ |
embeddedartists | 0:a771927a62fd | 400 | /*add a new byte at the end*/\ |
embeddedartists | 0:a771927a62fd | 401 | if(((*bitpointer) & 7) == 0) ucvector_push_back(bitstream, (unsigned char)0);\ |
embeddedartists | 0:a771927a62fd | 402 | /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/\ |
embeddedartists | 0:a771927a62fd | 403 | (bitstream->data[bitstream->size - 1]) |= (bit << ((*bitpointer) & 0x7));\ |
embeddedartists | 0:a771927a62fd | 404 | (*bitpointer)++;\ |
embeddedartists | 0:a771927a62fd | 405 | } |
embeddedartists | 0:a771927a62fd | 406 | |
embeddedartists | 0:a771927a62fd | 407 | static void addBitsToStream(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits) |
embeddedartists | 0:a771927a62fd | 408 | { |
embeddedartists | 0:a771927a62fd | 409 | size_t i; |
embeddedartists | 0:a771927a62fd | 410 | for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> i) & 1)); |
embeddedartists | 0:a771927a62fd | 411 | } |
embeddedartists | 0:a771927a62fd | 412 | |
embeddedartists | 0:a771927a62fd | 413 | static void addBitsToStreamReversed(size_t* bitpointer, ucvector* bitstream, unsigned value, size_t nbits) |
embeddedartists | 0:a771927a62fd | 414 | { |
embeddedartists | 0:a771927a62fd | 415 | size_t i; |
embeddedartists | 0:a771927a62fd | 416 | for(i = 0; i < nbits; i++) addBitToStream(bitpointer, bitstream, (unsigned char)((value >> (nbits - 1 - i)) & 1)); |
embeddedartists | 0:a771927a62fd | 417 | } |
embeddedartists | 0:a771927a62fd | 418 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 419 | |
embeddedartists | 0:a771927a62fd | 420 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 421 | |
embeddedartists | 0:a771927a62fd | 422 | #define READBIT(bitpointer, bitstream) ((bitstream[bitpointer >> 3] >> (bitpointer & 0x7)) & (unsigned char)1) |
embeddedartists | 0:a771927a62fd | 423 | |
embeddedartists | 0:a771927a62fd | 424 | static unsigned char readBitFromStream(size_t* bitpointer, const unsigned char* bitstream) |
embeddedartists | 0:a771927a62fd | 425 | { |
embeddedartists | 0:a771927a62fd | 426 | unsigned char result = (unsigned char)(READBIT(*bitpointer, bitstream)); |
embeddedartists | 0:a771927a62fd | 427 | (*bitpointer)++; |
embeddedartists | 0:a771927a62fd | 428 | return result; |
embeddedartists | 0:a771927a62fd | 429 | } |
embeddedartists | 0:a771927a62fd | 430 | |
embeddedartists | 0:a771927a62fd | 431 | static unsigned readBitsFromStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) |
embeddedartists | 0:a771927a62fd | 432 | { |
embeddedartists | 0:a771927a62fd | 433 | unsigned result = 0, i; |
embeddedartists | 0:a771927a62fd | 434 | for(i = 0; i < nbits; i++) |
embeddedartists | 0:a771927a62fd | 435 | { |
embeddedartists | 0:a771927a62fd | 436 | result += ((unsigned)READBIT(*bitpointer, bitstream)) << i; |
embeddedartists | 0:a771927a62fd | 437 | (*bitpointer)++; |
embeddedartists | 0:a771927a62fd | 438 | } |
embeddedartists | 0:a771927a62fd | 439 | return result; |
embeddedartists | 0:a771927a62fd | 440 | } |
embeddedartists | 0:a771927a62fd | 441 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 442 | |
embeddedartists | 0:a771927a62fd | 443 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 444 | /* / Deflate - Huffman / */ |
embeddedartists | 0:a771927a62fd | 445 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 446 | |
embeddedartists | 0:a771927a62fd | 447 | #define FIRST_LENGTH_CODE_INDEX 257 |
embeddedartists | 0:a771927a62fd | 448 | #define LAST_LENGTH_CODE_INDEX 285 |
embeddedartists | 0:a771927a62fd | 449 | /*256 literals, the end code, some length codes, and 2 unused codes*/ |
embeddedartists | 0:a771927a62fd | 450 | #define NUM_DEFLATE_CODE_SYMBOLS 288 |
embeddedartists | 0:a771927a62fd | 451 | /*the distance codes have their own symbols, 30 used, 2 unused*/ |
embeddedartists | 0:a771927a62fd | 452 | #define NUM_DISTANCE_SYMBOLS 32 |
embeddedartists | 0:a771927a62fd | 453 | /*the code length codes. 0-15: code lengths, 16: copy previous 3-6 times, 17: 3-10 zeros, 18: 11-138 zeros*/ |
embeddedartists | 0:a771927a62fd | 454 | #define NUM_CODE_LENGTH_CODES 19 |
embeddedartists | 0:a771927a62fd | 455 | |
embeddedartists | 0:a771927a62fd | 456 | /*the base lengths represented by codes 257-285*/ |
embeddedartists | 0:a771927a62fd | 457 | static const unsigned LENGTHBASE[29] |
embeddedartists | 0:a771927a62fd | 458 | = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, |
embeddedartists | 0:a771927a62fd | 459 | 67, 83, 99, 115, 131, 163, 195, 227, 258}; |
embeddedartists | 0:a771927a62fd | 460 | |
embeddedartists | 0:a771927a62fd | 461 | /*the extra bits used by codes 257-285 (added to base length)*/ |
embeddedartists | 0:a771927a62fd | 462 | static const unsigned LENGTHEXTRA[29] |
embeddedartists | 0:a771927a62fd | 463 | = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, |
embeddedartists | 0:a771927a62fd | 464 | 4, 4, 4, 4, 5, 5, 5, 5, 0}; |
embeddedartists | 0:a771927a62fd | 465 | |
embeddedartists | 0:a771927a62fd | 466 | /*the base backwards distances (the bits of distance codes appear after length codes and use their own huffman tree)*/ |
embeddedartists | 0:a771927a62fd | 467 | static const unsigned DISTANCEBASE[30] |
embeddedartists | 0:a771927a62fd | 468 | = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, |
embeddedartists | 0:a771927a62fd | 469 | 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; |
embeddedartists | 0:a771927a62fd | 470 | |
embeddedartists | 0:a771927a62fd | 471 | /*the extra bits of backwards distances (added to base)*/ |
embeddedartists | 0:a771927a62fd | 472 | static const unsigned DISTANCEEXTRA[30] |
embeddedartists | 0:a771927a62fd | 473 | = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, |
embeddedartists | 0:a771927a62fd | 474 | 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; |
embeddedartists | 0:a771927a62fd | 475 | |
embeddedartists | 0:a771927a62fd | 476 | /*the order in which "code length alphabet code lengths" are stored, out of this |
embeddedartists | 0:a771927a62fd | 477 | the huffman tree of the dynamic huffman tree lengths is generated*/ |
embeddedartists | 0:a771927a62fd | 478 | static const unsigned CLCL_ORDER[NUM_CODE_LENGTH_CODES] |
embeddedartists | 0:a771927a62fd | 479 | = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; |
embeddedartists | 0:a771927a62fd | 480 | |
embeddedartists | 0:a771927a62fd | 481 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 482 | |
embeddedartists | 0:a771927a62fd | 483 | /* |
embeddedartists | 0:a771927a62fd | 484 | Huffman tree struct, containing multiple representations of the tree |
embeddedartists | 0:a771927a62fd | 485 | */ |
embeddedartists | 0:a771927a62fd | 486 | typedef struct HuffmanTree |
embeddedartists | 0:a771927a62fd | 487 | { |
embeddedartists | 0:a771927a62fd | 488 | unsigned* tree2d; |
embeddedartists | 0:a771927a62fd | 489 | unsigned* tree1d; |
embeddedartists | 0:a771927a62fd | 490 | unsigned* lengths; /*the lengths of the codes of the 1d-tree*/ |
embeddedartists | 0:a771927a62fd | 491 | unsigned maxbitlen; /*maximum number of bits a single code can get*/ |
embeddedartists | 0:a771927a62fd | 492 | unsigned numcodes; /*number of symbols in the alphabet = number of codes*/ |
embeddedartists | 0:a771927a62fd | 493 | } HuffmanTree; |
embeddedartists | 0:a771927a62fd | 494 | |
embeddedartists | 0:a771927a62fd | 495 | /*function used for debug purposes to draw the tree in ascii art with C++*/ |
embeddedartists | 0:a771927a62fd | 496 | /* |
embeddedartists | 0:a771927a62fd | 497 | static void HuffmanTree_draw(HuffmanTree* tree) |
embeddedartists | 0:a771927a62fd | 498 | { |
embeddedartists | 0:a771927a62fd | 499 | std::cout << "tree. length: " << tree->numcodes << " maxbitlen: " << tree->maxbitlen << std::endl; |
embeddedartists | 0:a771927a62fd | 500 | for(size_t i = 0; i < tree->tree1d.size; i++) |
embeddedartists | 0:a771927a62fd | 501 | { |
embeddedartists | 0:a771927a62fd | 502 | if(tree->lengths.data[i]) |
embeddedartists | 0:a771927a62fd | 503 | std::cout << i << " " << tree->tree1d.data[i] << " " << tree->lengths.data[i] << std::endl; |
embeddedartists | 0:a771927a62fd | 504 | } |
embeddedartists | 0:a771927a62fd | 505 | std::cout << std::endl; |
embeddedartists | 0:a771927a62fd | 506 | }*/ |
embeddedartists | 0:a771927a62fd | 507 | |
embeddedartists | 0:a771927a62fd | 508 | static void HuffmanTree_init(HuffmanTree* tree) |
embeddedartists | 0:a771927a62fd | 509 | { |
embeddedartists | 0:a771927a62fd | 510 | tree->tree2d = 0; |
embeddedartists | 0:a771927a62fd | 511 | tree->tree1d = 0; |
embeddedartists | 0:a771927a62fd | 512 | tree->lengths = 0; |
embeddedartists | 0:a771927a62fd | 513 | } |
embeddedartists | 0:a771927a62fd | 514 | |
embeddedartists | 0:a771927a62fd | 515 | static void HuffmanTree_cleanup(HuffmanTree* tree) |
embeddedartists | 0:a771927a62fd | 516 | { |
embeddedartists | 0:a771927a62fd | 517 | lodepng_free(tree->tree2d); |
embeddedartists | 0:a771927a62fd | 518 | lodepng_free(tree->tree1d); |
embeddedartists | 0:a771927a62fd | 519 | lodepng_free(tree->lengths); |
embeddedartists | 0:a771927a62fd | 520 | } |
embeddedartists | 0:a771927a62fd | 521 | |
embeddedartists | 0:a771927a62fd | 522 | /*the tree representation used by the decoder. return value is error*/ |
embeddedartists | 0:a771927a62fd | 523 | static unsigned HuffmanTree_make2DTree(HuffmanTree* tree) |
embeddedartists | 0:a771927a62fd | 524 | { |
embeddedartists | 0:a771927a62fd | 525 | unsigned nodefilled = 0; /*up to which node it is filled*/ |
embeddedartists | 0:a771927a62fd | 526 | unsigned treepos = 0; /*position in the tree (1 of the numcodes columns)*/ |
embeddedartists | 0:a771927a62fd | 527 | unsigned n, i; |
embeddedartists | 0:a771927a62fd | 528 | |
embeddedartists | 0:a771927a62fd | 529 | tree->tree2d = (unsigned*)lodepng_malloc(tree->numcodes * 2 * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 530 | if(!tree->tree2d) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 531 | |
embeddedartists | 0:a771927a62fd | 532 | /* |
embeddedartists | 0:a771927a62fd | 533 | convert tree1d[] to tree2d[][]. In the 2D array, a value of 32767 means |
embeddedartists | 0:a771927a62fd | 534 | uninited, a value >= numcodes is an address to another bit, a value < numcodes |
embeddedartists | 0:a771927a62fd | 535 | is a code. The 2 rows are the 2 possible bit values (0 or 1), there are as |
embeddedartists | 0:a771927a62fd | 536 | many columns as codes - 1. |
embeddedartists | 0:a771927a62fd | 537 | A good huffmann tree has N * 2 - 1 nodes, of which N - 1 are internal nodes. |
embeddedartists | 0:a771927a62fd | 538 | Here, the internal nodes are stored (what their 0 and 1 option point to). |
embeddedartists | 0:a771927a62fd | 539 | There is only memory for such good tree currently, if there are more nodes |
embeddedartists | 0:a771927a62fd | 540 | (due to too long length codes), error 55 will happen |
embeddedartists | 0:a771927a62fd | 541 | */ |
embeddedartists | 0:a771927a62fd | 542 | for(n = 0; n < tree->numcodes * 2; n++) |
embeddedartists | 0:a771927a62fd | 543 | { |
embeddedartists | 0:a771927a62fd | 544 | tree->tree2d[n] = 32767; /*32767 here means the tree2d isn't filled there yet*/ |
embeddedartists | 0:a771927a62fd | 545 | } |
embeddedartists | 0:a771927a62fd | 546 | |
embeddedartists | 0:a771927a62fd | 547 | for(n = 0; n < tree->numcodes; n++) /*the codes*/ |
embeddedartists | 0:a771927a62fd | 548 | { |
embeddedartists | 0:a771927a62fd | 549 | for(i = 0; i < tree->lengths[n]; i++) /*the bits for this code*/ |
embeddedartists | 0:a771927a62fd | 550 | { |
embeddedartists | 0:a771927a62fd | 551 | unsigned char bit = (unsigned char)((tree->tree1d[n] >> (tree->lengths[n] - i - 1)) & 1); |
embeddedartists | 0:a771927a62fd | 552 | if(treepos > tree->numcodes - 2) return 55; /*oversubscribed, see comment in lodepng_error_text*/ |
embeddedartists | 0:a771927a62fd | 553 | if(tree->tree2d[2 * treepos + bit] == 32767) /*not yet filled in*/ |
embeddedartists | 0:a771927a62fd | 554 | { |
embeddedartists | 0:a771927a62fd | 555 | if(i + 1 == tree->lengths[n]) /*last bit*/ |
embeddedartists | 0:a771927a62fd | 556 | { |
embeddedartists | 0:a771927a62fd | 557 | tree->tree2d[2 * treepos + bit] = n; /*put the current code in it*/ |
embeddedartists | 0:a771927a62fd | 558 | treepos = 0; |
embeddedartists | 0:a771927a62fd | 559 | } |
embeddedartists | 0:a771927a62fd | 560 | else |
embeddedartists | 0:a771927a62fd | 561 | { |
embeddedartists | 0:a771927a62fd | 562 | /*put address of the next step in here, first that address has to be found of course |
embeddedartists | 0:a771927a62fd | 563 | (it's just nodefilled + 1)...*/ |
embeddedartists | 0:a771927a62fd | 564 | nodefilled++; |
embeddedartists | 0:a771927a62fd | 565 | /*addresses encoded with numcodes added to it*/ |
embeddedartists | 0:a771927a62fd | 566 | tree->tree2d[2 * treepos + bit] = nodefilled + tree->numcodes; |
embeddedartists | 0:a771927a62fd | 567 | treepos = nodefilled; |
embeddedartists | 0:a771927a62fd | 568 | } |
embeddedartists | 0:a771927a62fd | 569 | } |
embeddedartists | 0:a771927a62fd | 570 | else treepos = tree->tree2d[2 * treepos + bit] - tree->numcodes; |
embeddedartists | 0:a771927a62fd | 571 | } |
embeddedartists | 0:a771927a62fd | 572 | } |
embeddedartists | 0:a771927a62fd | 573 | |
embeddedartists | 0:a771927a62fd | 574 | for(n = 0; n < tree->numcodes * 2; n++) |
embeddedartists | 0:a771927a62fd | 575 | { |
embeddedartists | 0:a771927a62fd | 576 | if(tree->tree2d[n] == 32767) tree->tree2d[n] = 0; /*remove possible remaining 32767's*/ |
embeddedartists | 0:a771927a62fd | 577 | } |
embeddedartists | 0:a771927a62fd | 578 | |
embeddedartists | 0:a771927a62fd | 579 | return 0; |
embeddedartists | 0:a771927a62fd | 580 | } |
embeddedartists | 0:a771927a62fd | 581 | |
embeddedartists | 0:a771927a62fd | 582 | /* |
embeddedartists | 0:a771927a62fd | 583 | Second step for the ...makeFromLengths and ...makeFromFrequencies functions. |
embeddedartists | 0:a771927a62fd | 584 | numcodes, lengths and maxbitlen must already be filled in correctly. return |
embeddedartists | 0:a771927a62fd | 585 | value is error. |
embeddedartists | 0:a771927a62fd | 586 | */ |
embeddedartists | 0:a771927a62fd | 587 | static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree) |
embeddedartists | 0:a771927a62fd | 588 | { |
embeddedartists | 0:a771927a62fd | 589 | uivector blcount; |
embeddedartists | 0:a771927a62fd | 590 | uivector nextcode; |
embeddedartists | 0:a771927a62fd | 591 | unsigned bits, n, error = 0; |
embeddedartists | 0:a771927a62fd | 592 | |
embeddedartists | 0:a771927a62fd | 593 | uivector_init(&blcount); |
embeddedartists | 0:a771927a62fd | 594 | uivector_init(&nextcode); |
embeddedartists | 0:a771927a62fd | 595 | |
embeddedartists | 0:a771927a62fd | 596 | tree->tree1d = (unsigned*)lodepng_malloc(tree->numcodes * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 597 | if(!tree->tree1d) error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 598 | |
embeddedartists | 0:a771927a62fd | 599 | if(!uivector_resizev(&blcount, tree->maxbitlen + 1, 0) |
embeddedartists | 0:a771927a62fd | 600 | || !uivector_resizev(&nextcode, tree->maxbitlen + 1, 0)) |
embeddedartists | 0:a771927a62fd | 601 | error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 602 | |
embeddedartists | 0:a771927a62fd | 603 | if(!error) |
embeddedartists | 0:a771927a62fd | 604 | { |
embeddedartists | 0:a771927a62fd | 605 | /*step 1: count number of instances of each code length*/ |
embeddedartists | 0:a771927a62fd | 606 | for(bits = 0; bits < tree->numcodes; bits++) blcount.data[tree->lengths[bits]]++; |
embeddedartists | 0:a771927a62fd | 607 | /*step 2: generate the nextcode values*/ |
embeddedartists | 0:a771927a62fd | 608 | for(bits = 1; bits <= tree->maxbitlen; bits++) |
embeddedartists | 0:a771927a62fd | 609 | { |
embeddedartists | 0:a771927a62fd | 610 | nextcode.data[bits] = (nextcode.data[bits - 1] + blcount.data[bits - 1]) << 1; |
embeddedartists | 0:a771927a62fd | 611 | } |
embeddedartists | 0:a771927a62fd | 612 | /*step 3: generate all the codes*/ |
embeddedartists | 0:a771927a62fd | 613 | for(n = 0; n < tree->numcodes; n++) |
embeddedartists | 0:a771927a62fd | 614 | { |
embeddedartists | 0:a771927a62fd | 615 | if(tree->lengths[n] != 0) tree->tree1d[n] = nextcode.data[tree->lengths[n]]++; |
embeddedartists | 0:a771927a62fd | 616 | } |
embeddedartists | 0:a771927a62fd | 617 | } |
embeddedartists | 0:a771927a62fd | 618 | |
embeddedartists | 0:a771927a62fd | 619 | uivector_cleanup(&blcount); |
embeddedartists | 0:a771927a62fd | 620 | uivector_cleanup(&nextcode); |
embeddedartists | 0:a771927a62fd | 621 | |
embeddedartists | 0:a771927a62fd | 622 | if(!error) return HuffmanTree_make2DTree(tree); |
embeddedartists | 0:a771927a62fd | 623 | else return error; |
embeddedartists | 0:a771927a62fd | 624 | } |
embeddedartists | 0:a771927a62fd | 625 | |
embeddedartists | 0:a771927a62fd | 626 | /* |
embeddedartists | 0:a771927a62fd | 627 | given the code lengths (as stored in the PNG file), generate the tree as defined |
embeddedartists | 0:a771927a62fd | 628 | by Deflate. maxbitlen is the maximum bits that a code in the tree can have. |
embeddedartists | 0:a771927a62fd | 629 | return value is error. |
embeddedartists | 0:a771927a62fd | 630 | */ |
embeddedartists | 0:a771927a62fd | 631 | static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen, |
embeddedartists | 0:a771927a62fd | 632 | size_t numcodes, unsigned maxbitlen) |
embeddedartists | 0:a771927a62fd | 633 | { |
embeddedartists | 0:a771927a62fd | 634 | unsigned i; |
embeddedartists | 0:a771927a62fd | 635 | tree->lengths = (unsigned*)lodepng_malloc(numcodes * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 636 | if(!tree->lengths) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 637 | for(i = 0; i < numcodes; i++) tree->lengths[i] = bitlen[i]; |
embeddedartists | 0:a771927a62fd | 638 | tree->numcodes = (unsigned)numcodes; /*number of symbols*/ |
embeddedartists | 0:a771927a62fd | 639 | tree->maxbitlen = maxbitlen; |
embeddedartists | 0:a771927a62fd | 640 | return HuffmanTree_makeFromLengths2(tree); |
embeddedartists | 0:a771927a62fd | 641 | } |
embeddedartists | 0:a771927a62fd | 642 | |
embeddedartists | 0:a771927a62fd | 643 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 644 | |
embeddedartists | 0:a771927a62fd | 645 | /* |
embeddedartists | 0:a771927a62fd | 646 | A coin, this is the terminology used for the package-merge algorithm and the |
embeddedartists | 0:a771927a62fd | 647 | coin collector's problem. This is used to generate the huffman tree. |
embeddedartists | 0:a771927a62fd | 648 | A coin can be multiple coins (when they're merged) |
embeddedartists | 0:a771927a62fd | 649 | */ |
embeddedartists | 0:a771927a62fd | 650 | typedef struct Coin |
embeddedartists | 0:a771927a62fd | 651 | { |
embeddedartists | 0:a771927a62fd | 652 | uivector symbols; |
embeddedartists | 0:a771927a62fd | 653 | float weight; /*the sum of all weights in this coin*/ |
embeddedartists | 0:a771927a62fd | 654 | } Coin; |
embeddedartists | 0:a771927a62fd | 655 | |
embeddedartists | 0:a771927a62fd | 656 | static void coin_init(Coin* c) |
embeddedartists | 0:a771927a62fd | 657 | { |
embeddedartists | 0:a771927a62fd | 658 | uivector_init(&c->symbols); |
embeddedartists | 0:a771927a62fd | 659 | } |
embeddedartists | 0:a771927a62fd | 660 | |
embeddedartists | 0:a771927a62fd | 661 | /*argument c is void* so that this dtor can be given as function pointer to the vector resize function*/ |
embeddedartists | 0:a771927a62fd | 662 | static void coin_cleanup(void* c) |
embeddedartists | 0:a771927a62fd | 663 | { |
embeddedartists | 0:a771927a62fd | 664 | uivector_cleanup(&((Coin*)c)->symbols); |
embeddedartists | 0:a771927a62fd | 665 | } |
embeddedartists | 0:a771927a62fd | 666 | |
embeddedartists | 0:a771927a62fd | 667 | static void coin_copy(Coin* c1, const Coin* c2) |
embeddedartists | 0:a771927a62fd | 668 | { |
embeddedartists | 0:a771927a62fd | 669 | c1->weight = c2->weight; |
embeddedartists | 0:a771927a62fd | 670 | uivector_copy(&c1->symbols, &c2->symbols); |
embeddedartists | 0:a771927a62fd | 671 | } |
embeddedartists | 0:a771927a62fd | 672 | |
embeddedartists | 0:a771927a62fd | 673 | static void add_coins(Coin* c1, const Coin* c2) |
embeddedartists | 0:a771927a62fd | 674 | { |
embeddedartists | 0:a771927a62fd | 675 | size_t i; |
embeddedartists | 0:a771927a62fd | 676 | for(i = 0; i < c2->symbols.size; i++) uivector_push_back(&c1->symbols, c2->symbols.data[i]); |
embeddedartists | 0:a771927a62fd | 677 | c1->weight += c2->weight; |
embeddedartists | 0:a771927a62fd | 678 | } |
embeddedartists | 0:a771927a62fd | 679 | |
embeddedartists | 0:a771927a62fd | 680 | static void init_coins(Coin* coins, size_t num) |
embeddedartists | 0:a771927a62fd | 681 | { |
embeddedartists | 0:a771927a62fd | 682 | size_t i; |
embeddedartists | 0:a771927a62fd | 683 | for(i = 0; i < num; i++) coin_init(&coins[i]); |
embeddedartists | 0:a771927a62fd | 684 | } |
embeddedartists | 0:a771927a62fd | 685 | |
embeddedartists | 0:a771927a62fd | 686 | static void cleanup_coins(Coin* coins, size_t num) |
embeddedartists | 0:a771927a62fd | 687 | { |
embeddedartists | 0:a771927a62fd | 688 | size_t i; |
embeddedartists | 0:a771927a62fd | 689 | for(i = 0; i < num; i++) coin_cleanup(&coins[i]); |
embeddedartists | 0:a771927a62fd | 690 | } |
embeddedartists | 0:a771927a62fd | 691 | |
embeddedartists | 0:a771927a62fd | 692 | static int coin_compare(const void* a, const void* b) { |
embeddedartists | 0:a771927a62fd | 693 | float wa = ((const Coin*)a)->weight; |
embeddedartists | 0:a771927a62fd | 694 | float wb = ((const Coin*)b)->weight; |
embeddedartists | 0:a771927a62fd | 695 | return wa > wb ? 1 : wa < wb ? -1 : 0; |
embeddedartists | 0:a771927a62fd | 696 | } |
embeddedartists | 0:a771927a62fd | 697 | |
embeddedartists | 0:a771927a62fd | 698 | static unsigned append_symbol_coins(Coin* coins, const unsigned* frequencies, unsigned numcodes, size_t sum) |
embeddedartists | 0:a771927a62fd | 699 | { |
embeddedartists | 0:a771927a62fd | 700 | unsigned i; |
embeddedartists | 0:a771927a62fd | 701 | unsigned j = 0; /*index of present symbols*/ |
embeddedartists | 0:a771927a62fd | 702 | for(i = 0; i < numcodes; i++) |
embeddedartists | 0:a771927a62fd | 703 | { |
embeddedartists | 0:a771927a62fd | 704 | if(frequencies[i] != 0) /*only include symbols that are present*/ |
embeddedartists | 0:a771927a62fd | 705 | { |
embeddedartists | 0:a771927a62fd | 706 | coins[j].weight = frequencies[i] / (float)sum; |
embeddedartists | 0:a771927a62fd | 707 | uivector_push_back(&coins[j].symbols, i); |
embeddedartists | 0:a771927a62fd | 708 | j++; |
embeddedartists | 0:a771927a62fd | 709 | } |
embeddedartists | 0:a771927a62fd | 710 | } |
embeddedartists | 0:a771927a62fd | 711 | return 0; |
embeddedartists | 0:a771927a62fd | 712 | } |
embeddedartists | 0:a771927a62fd | 713 | |
embeddedartists | 0:a771927a62fd | 714 | unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies, |
embeddedartists | 0:a771927a62fd | 715 | size_t numcodes, unsigned maxbitlen) |
embeddedartists | 0:a771927a62fd | 716 | { |
embeddedartists | 0:a771927a62fd | 717 | unsigned i, j; |
embeddedartists | 0:a771927a62fd | 718 | size_t sum = 0, numpresent = 0; |
embeddedartists | 0:a771927a62fd | 719 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 720 | Coin* coins; /*the coins of the currently calculated row*/ |
embeddedartists | 0:a771927a62fd | 721 | Coin* prev_row; /*the previous row of coins*/ |
embeddedartists | 0:a771927a62fd | 722 | unsigned numcoins; |
embeddedartists | 0:a771927a62fd | 723 | unsigned coinmem; |
embeddedartists | 0:a771927a62fd | 724 | |
embeddedartists | 0:a771927a62fd | 725 | if(numcodes == 0) return 80; /*error: a tree of 0 symbols is not supposed to be made*/ |
embeddedartists | 0:a771927a62fd | 726 | |
embeddedartists | 0:a771927a62fd | 727 | for(i = 0; i < numcodes; i++) |
embeddedartists | 0:a771927a62fd | 728 | { |
embeddedartists | 0:a771927a62fd | 729 | if(frequencies[i] > 0) |
embeddedartists | 0:a771927a62fd | 730 | { |
embeddedartists | 0:a771927a62fd | 731 | numpresent++; |
embeddedartists | 0:a771927a62fd | 732 | sum += frequencies[i]; |
embeddedartists | 0:a771927a62fd | 733 | } |
embeddedartists | 0:a771927a62fd | 734 | } |
embeddedartists | 0:a771927a62fd | 735 | |
embeddedartists | 0:a771927a62fd | 736 | for(i = 0; i < numcodes; i++) lengths[i] = 0; |
embeddedartists | 0:a771927a62fd | 737 | |
embeddedartists | 0:a771927a62fd | 738 | /*ensure at least two present symbols. There should be at least one symbol |
embeddedartists | 0:a771927a62fd | 739 | according to RFC 1951 section 3.2.7. To decoders incorrectly require two. To |
embeddedartists | 0:a771927a62fd | 740 | make these work as well ensure there are at least two symbols. The |
embeddedartists | 0:a771927a62fd | 741 | Package-Merge code below also doesn't work correctly if there's only one |
embeddedartists | 0:a771927a62fd | 742 | symbol, it'd give it the theoritical 0 bits but in practice zlib wants 1 bit*/ |
embeddedartists | 0:a771927a62fd | 743 | if(numpresent == 0) |
embeddedartists | 0:a771927a62fd | 744 | { |
embeddedartists | 0:a771927a62fd | 745 | lengths[0] = lengths[1] = 1; /*note that for RFC 1951 section 3.2.7, only lengths[0] = 1 is needed*/ |
embeddedartists | 0:a771927a62fd | 746 | } |
embeddedartists | 0:a771927a62fd | 747 | else if(numpresent == 1) |
embeddedartists | 0:a771927a62fd | 748 | { |
embeddedartists | 0:a771927a62fd | 749 | for(i = 0; i < numcodes; i++) |
embeddedartists | 0:a771927a62fd | 750 | { |
embeddedartists | 0:a771927a62fd | 751 | if(frequencies[i]) |
embeddedartists | 0:a771927a62fd | 752 | { |
embeddedartists | 0:a771927a62fd | 753 | lengths[i] = 1; |
embeddedartists | 0:a771927a62fd | 754 | lengths[i == 0 ? 1 : 0] = 1; |
embeddedartists | 0:a771927a62fd | 755 | break; |
embeddedartists | 0:a771927a62fd | 756 | } |
embeddedartists | 0:a771927a62fd | 757 | } |
embeddedartists | 0:a771927a62fd | 758 | } |
embeddedartists | 0:a771927a62fd | 759 | else |
embeddedartists | 0:a771927a62fd | 760 | { |
embeddedartists | 0:a771927a62fd | 761 | /*Package-Merge algorithm represented by coin collector's problem |
embeddedartists | 0:a771927a62fd | 762 | For every symbol, maxbitlen coins will be created*/ |
embeddedartists | 0:a771927a62fd | 763 | |
embeddedartists | 0:a771927a62fd | 764 | coinmem = numpresent * 2; /*max amount of coins needed with the current algo*/ |
embeddedartists | 0:a771927a62fd | 765 | coins = (Coin*)lodepng_malloc(sizeof(Coin) * coinmem); |
embeddedartists | 0:a771927a62fd | 766 | prev_row = (Coin*)lodepng_malloc(sizeof(Coin) * coinmem); |
embeddedartists | 0:a771927a62fd | 767 | if(!coins || !prev_row) |
embeddedartists | 0:a771927a62fd | 768 | { |
embeddedartists | 0:a771927a62fd | 769 | lodepng_free(coins); |
embeddedartists | 0:a771927a62fd | 770 | lodepng_free(prev_row); |
embeddedartists | 0:a771927a62fd | 771 | return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 772 | } |
embeddedartists | 0:a771927a62fd | 773 | init_coins(coins, coinmem); |
embeddedartists | 0:a771927a62fd | 774 | init_coins(prev_row, coinmem); |
embeddedartists | 0:a771927a62fd | 775 | |
embeddedartists | 0:a771927a62fd | 776 | /*first row, lowest denominator*/ |
embeddedartists | 0:a771927a62fd | 777 | error = append_symbol_coins(coins, frequencies, numcodes, sum); |
embeddedartists | 0:a771927a62fd | 778 | numcoins = numpresent; |
embeddedartists | 0:a771927a62fd | 779 | qsort(coins, numcoins, sizeof(Coin), coin_compare); |
embeddedartists | 0:a771927a62fd | 780 | if(!error) |
embeddedartists | 0:a771927a62fd | 781 | { |
embeddedartists | 0:a771927a62fd | 782 | unsigned numprev = 0; |
embeddedartists | 0:a771927a62fd | 783 | for(j = 1; j <= maxbitlen && !error; j++) /*each of the remaining rows*/ |
embeddedartists | 0:a771927a62fd | 784 | { |
embeddedartists | 0:a771927a62fd | 785 | unsigned tempnum; |
embeddedartists | 0:a771927a62fd | 786 | Coin* tempcoins; |
embeddedartists | 0:a771927a62fd | 787 | /*swap prev_row and coins, and their amounts*/ |
embeddedartists | 0:a771927a62fd | 788 | tempcoins = prev_row; prev_row = coins; coins = tempcoins; |
embeddedartists | 0:a771927a62fd | 789 | tempnum = numprev; numprev = numcoins; numcoins = tempnum; |
embeddedartists | 0:a771927a62fd | 790 | |
embeddedartists | 0:a771927a62fd | 791 | cleanup_coins(coins, numcoins); |
embeddedartists | 0:a771927a62fd | 792 | init_coins(coins, numcoins); |
embeddedartists | 0:a771927a62fd | 793 | |
embeddedartists | 0:a771927a62fd | 794 | numcoins = 0; |
embeddedartists | 0:a771927a62fd | 795 | |
embeddedartists | 0:a771927a62fd | 796 | /*fill in the merged coins of the previous row*/ |
embeddedartists | 0:a771927a62fd | 797 | for(i = 0; i + 1 < numprev; i += 2) |
embeddedartists | 0:a771927a62fd | 798 | { |
embeddedartists | 0:a771927a62fd | 799 | /*merge prev_row[i] and prev_row[i + 1] into new coin*/ |
embeddedartists | 0:a771927a62fd | 800 | Coin* coin = &coins[numcoins++]; |
embeddedartists | 0:a771927a62fd | 801 | coin_copy(coin, &prev_row[i]); |
embeddedartists | 0:a771927a62fd | 802 | add_coins(coin, &prev_row[i + 1]); |
embeddedartists | 0:a771927a62fd | 803 | } |
embeddedartists | 0:a771927a62fd | 804 | /*fill in all the original symbols again*/ |
embeddedartists | 0:a771927a62fd | 805 | if(j < maxbitlen) |
embeddedartists | 0:a771927a62fd | 806 | { |
embeddedartists | 0:a771927a62fd | 807 | error = append_symbol_coins(coins + numcoins, frequencies, numcodes, sum); |
embeddedartists | 0:a771927a62fd | 808 | numcoins += numpresent; |
embeddedartists | 0:a771927a62fd | 809 | } |
embeddedartists | 0:a771927a62fd | 810 | qsort(coins, numcoins, sizeof(Coin), coin_compare); |
embeddedartists | 0:a771927a62fd | 811 | } |
embeddedartists | 0:a771927a62fd | 812 | } |
embeddedartists | 0:a771927a62fd | 813 | |
embeddedartists | 0:a771927a62fd | 814 | if(!error) |
embeddedartists | 0:a771927a62fd | 815 | { |
embeddedartists | 0:a771927a62fd | 816 | /*calculate the lenghts of each symbol, as the amount of times a coin of each symbol is used*/ |
embeddedartists | 0:a771927a62fd | 817 | for(i = 0; i < numpresent - 1; i++) |
embeddedartists | 0:a771927a62fd | 818 | { |
embeddedartists | 0:a771927a62fd | 819 | Coin* coin = &coins[i]; |
embeddedartists | 0:a771927a62fd | 820 | for(j = 0; j < coin->symbols.size; j++) lengths[coin->symbols.data[j]]++; |
embeddedartists | 0:a771927a62fd | 821 | } |
embeddedartists | 0:a771927a62fd | 822 | } |
embeddedartists | 0:a771927a62fd | 823 | |
embeddedartists | 0:a771927a62fd | 824 | cleanup_coins(coins, coinmem); |
embeddedartists | 0:a771927a62fd | 825 | lodepng_free(coins); |
embeddedartists | 0:a771927a62fd | 826 | cleanup_coins(prev_row, coinmem); |
embeddedartists | 0:a771927a62fd | 827 | lodepng_free(prev_row); |
embeddedartists | 0:a771927a62fd | 828 | } |
embeddedartists | 0:a771927a62fd | 829 | |
embeddedartists | 0:a771927a62fd | 830 | return error; |
embeddedartists | 0:a771927a62fd | 831 | } |
embeddedartists | 0:a771927a62fd | 832 | |
embeddedartists | 0:a771927a62fd | 833 | /*Create the Huffman tree given the symbol frequencies*/ |
embeddedartists | 0:a771927a62fd | 834 | static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigned* frequencies, |
embeddedartists | 0:a771927a62fd | 835 | size_t mincodes, size_t numcodes, unsigned maxbitlen) |
embeddedartists | 0:a771927a62fd | 836 | { |
embeddedartists | 0:a771927a62fd | 837 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 838 | while(!frequencies[numcodes - 1] && numcodes > mincodes) numcodes--; /*trim zeroes*/ |
embeddedartists | 0:a771927a62fd | 839 | tree->maxbitlen = maxbitlen; |
embeddedartists | 0:a771927a62fd | 840 | tree->numcodes = (unsigned)numcodes; /*number of symbols*/ |
embeddedartists | 0:a771927a62fd | 841 | tree->lengths = (unsigned*)lodepng_realloc(tree->lengths, numcodes * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 842 | if(!tree->lengths) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 843 | /*initialize all lengths to 0*/ |
embeddedartists | 0:a771927a62fd | 844 | memset(tree->lengths, 0, numcodes * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 845 | |
embeddedartists | 0:a771927a62fd | 846 | error = lodepng_huffman_code_lengths(tree->lengths, frequencies, numcodes, maxbitlen); |
embeddedartists | 0:a771927a62fd | 847 | if(!error) error = HuffmanTree_makeFromLengths2(tree); |
embeddedartists | 0:a771927a62fd | 848 | return error; |
embeddedartists | 0:a771927a62fd | 849 | } |
embeddedartists | 0:a771927a62fd | 850 | |
embeddedartists | 0:a771927a62fd | 851 | static unsigned HuffmanTree_getCode(const HuffmanTree* tree, unsigned index) |
embeddedartists | 0:a771927a62fd | 852 | { |
embeddedartists | 0:a771927a62fd | 853 | return tree->tree1d[index]; |
embeddedartists | 0:a771927a62fd | 854 | } |
embeddedartists | 0:a771927a62fd | 855 | |
embeddedartists | 0:a771927a62fd | 856 | static unsigned HuffmanTree_getLength(const HuffmanTree* tree, unsigned index) |
embeddedartists | 0:a771927a62fd | 857 | { |
embeddedartists | 0:a771927a62fd | 858 | return tree->lengths[index]; |
embeddedartists | 0:a771927a62fd | 859 | } |
embeddedartists | 0:a771927a62fd | 860 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 861 | |
embeddedartists | 0:a771927a62fd | 862 | /*get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/ |
embeddedartists | 0:a771927a62fd | 863 | static unsigned generateFixedLitLenTree(HuffmanTree* tree) |
embeddedartists | 0:a771927a62fd | 864 | { |
embeddedartists | 0:a771927a62fd | 865 | unsigned i, error = 0; |
embeddedartists | 0:a771927a62fd | 866 | unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 867 | if(!bitlen) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 868 | |
embeddedartists | 0:a771927a62fd | 869 | /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/ |
embeddedartists | 0:a771927a62fd | 870 | for(i = 0; i <= 143; i++) bitlen[i] = 8; |
embeddedartists | 0:a771927a62fd | 871 | for(i = 144; i <= 255; i++) bitlen[i] = 9; |
embeddedartists | 0:a771927a62fd | 872 | for(i = 256; i <= 279; i++) bitlen[i] = 7; |
embeddedartists | 0:a771927a62fd | 873 | for(i = 280; i <= 287; i++) bitlen[i] = 8; |
embeddedartists | 0:a771927a62fd | 874 | |
embeddedartists | 0:a771927a62fd | 875 | error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DEFLATE_CODE_SYMBOLS, 15); |
embeddedartists | 0:a771927a62fd | 876 | |
embeddedartists | 0:a771927a62fd | 877 | lodepng_free(bitlen); |
embeddedartists | 0:a771927a62fd | 878 | return error; |
embeddedartists | 0:a771927a62fd | 879 | } |
embeddedartists | 0:a771927a62fd | 880 | |
embeddedartists | 0:a771927a62fd | 881 | /*get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/ |
embeddedartists | 0:a771927a62fd | 882 | static unsigned generateFixedDistanceTree(HuffmanTree* tree) |
embeddedartists | 0:a771927a62fd | 883 | { |
embeddedartists | 0:a771927a62fd | 884 | unsigned i, error = 0; |
embeddedartists | 0:a771927a62fd | 885 | unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 886 | if(!bitlen) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 887 | |
embeddedartists | 0:a771927a62fd | 888 | /*there are 32 distance codes, but 30-31 are unused*/ |
embeddedartists | 0:a771927a62fd | 889 | for(i = 0; i < NUM_DISTANCE_SYMBOLS; i++) bitlen[i] = 5; |
embeddedartists | 0:a771927a62fd | 890 | error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DISTANCE_SYMBOLS, 15); |
embeddedartists | 0:a771927a62fd | 891 | |
embeddedartists | 0:a771927a62fd | 892 | lodepng_free(bitlen); |
embeddedartists | 0:a771927a62fd | 893 | return error; |
embeddedartists | 0:a771927a62fd | 894 | } |
embeddedartists | 0:a771927a62fd | 895 | |
embeddedartists | 0:a771927a62fd | 896 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 897 | |
embeddedartists | 0:a771927a62fd | 898 | /* |
embeddedartists | 0:a771927a62fd | 899 | returns the code, or (unsigned)(-1) if error happened |
embeddedartists | 0:a771927a62fd | 900 | inbitlength is the length of the complete buffer, in bits (so its byte length times 8) |
embeddedartists | 0:a771927a62fd | 901 | */ |
embeddedartists | 0:a771927a62fd | 902 | static unsigned huffmanDecodeSymbol(const unsigned char* in, size_t* bp, |
embeddedartists | 0:a771927a62fd | 903 | const HuffmanTree* codetree, size_t inbitlength) |
embeddedartists | 0:a771927a62fd | 904 | { |
embeddedartists | 0:a771927a62fd | 905 | unsigned treepos = 0, ct; |
embeddedartists | 0:a771927a62fd | 906 | for(;;) |
embeddedartists | 0:a771927a62fd | 907 | { |
embeddedartists | 0:a771927a62fd | 908 | if(*bp >= inbitlength) return (unsigned)(-1); /*error: end of input memory reached without endcode*/ |
embeddedartists | 0:a771927a62fd | 909 | /* |
embeddedartists | 0:a771927a62fd | 910 | decode the symbol from the tree. The "readBitFromStream" code is inlined in |
embeddedartists | 0:a771927a62fd | 911 | the expression below because this is the biggest bottleneck while decoding |
embeddedartists | 0:a771927a62fd | 912 | */ |
embeddedartists | 0:a771927a62fd | 913 | ct = codetree->tree2d[(treepos << 1) + READBIT(*bp, in)]; |
embeddedartists | 0:a771927a62fd | 914 | (*bp)++; |
embeddedartists | 0:a771927a62fd | 915 | if(ct < codetree->numcodes) return ct; /*the symbol is decoded, return it*/ |
embeddedartists | 0:a771927a62fd | 916 | else treepos = ct - codetree->numcodes; /*symbol not yet decoded, instead move tree position*/ |
embeddedartists | 0:a771927a62fd | 917 | |
embeddedartists | 0:a771927a62fd | 918 | if(treepos >= codetree->numcodes) return (unsigned)(-1); /*error: it appeared outside the codetree*/ |
embeddedartists | 0:a771927a62fd | 919 | } |
embeddedartists | 0:a771927a62fd | 920 | } |
embeddedartists | 0:a771927a62fd | 921 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 922 | |
embeddedartists | 0:a771927a62fd | 923 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 924 | |
embeddedartists | 0:a771927a62fd | 925 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 926 | /* / Inflator (Decompressor) / */ |
embeddedartists | 0:a771927a62fd | 927 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 928 | |
embeddedartists | 0:a771927a62fd | 929 | /*get the tree of a deflated block with fixed tree, as specified in the deflate specification*/ |
embeddedartists | 0:a771927a62fd | 930 | static void getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d) |
embeddedartists | 0:a771927a62fd | 931 | { |
embeddedartists | 0:a771927a62fd | 932 | /*TODO: check for out of memory errors*/ |
embeddedartists | 0:a771927a62fd | 933 | generateFixedLitLenTree(tree_ll); |
embeddedartists | 0:a771927a62fd | 934 | generateFixedDistanceTree(tree_d); |
embeddedartists | 0:a771927a62fd | 935 | } |
embeddedartists | 0:a771927a62fd | 936 | |
embeddedartists | 0:a771927a62fd | 937 | /*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/ |
embeddedartists | 0:a771927a62fd | 938 | static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d, |
embeddedartists | 0:a771927a62fd | 939 | const unsigned char* in, size_t* bp, size_t inlength) |
embeddedartists | 0:a771927a62fd | 940 | { |
embeddedartists | 0:a771927a62fd | 941 | /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/ |
embeddedartists | 0:a771927a62fd | 942 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 943 | unsigned n, HLIT, HDIST, HCLEN, i; |
embeddedartists | 0:a771927a62fd | 944 | size_t inbitlength = inlength * 8; |
embeddedartists | 0:a771927a62fd | 945 | |
embeddedartists | 0:a771927a62fd | 946 | /*see comments in deflateDynamic for explanation of the context and these variables, it is analogous*/ |
embeddedartists | 0:a771927a62fd | 947 | unsigned* bitlen_ll = 0; /*lit,len code lengths*/ |
embeddedartists | 0:a771927a62fd | 948 | unsigned* bitlen_d = 0; /*dist code lengths*/ |
embeddedartists | 0:a771927a62fd | 949 | /*code length code lengths ("clcl"), the bit lengths of the huffman tree used to compress bitlen_ll and bitlen_d*/ |
embeddedartists | 0:a771927a62fd | 950 | unsigned* bitlen_cl = 0; |
embeddedartists | 0:a771927a62fd | 951 | HuffmanTree tree_cl; /*the code tree for code length codes (the huffman tree for compressed huffman trees)*/ |
embeddedartists | 0:a771927a62fd | 952 | |
embeddedartists | 0:a771927a62fd | 953 | if((*bp) >> 3 >= inlength - 2) return 49; /*error: the bit pointer is or will go past the memory*/ |
embeddedartists | 0:a771927a62fd | 954 | |
embeddedartists | 0:a771927a62fd | 955 | /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/ |
embeddedartists | 0:a771927a62fd | 956 | HLIT = readBitsFromStream(bp, in, 5) + 257; |
embeddedartists | 0:a771927a62fd | 957 | /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/ |
embeddedartists | 0:a771927a62fd | 958 | HDIST = readBitsFromStream(bp, in, 5) + 1; |
embeddedartists | 0:a771927a62fd | 959 | /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/ |
embeddedartists | 0:a771927a62fd | 960 | HCLEN = readBitsFromStream(bp, in, 4) + 4; |
embeddedartists | 0:a771927a62fd | 961 | |
embeddedartists | 0:a771927a62fd | 962 | HuffmanTree_init(&tree_cl); |
embeddedartists | 0:a771927a62fd | 963 | |
embeddedartists | 0:a771927a62fd | 964 | while(!error) |
embeddedartists | 0:a771927a62fd | 965 | { |
embeddedartists | 0:a771927a62fd | 966 | /*read the code length codes out of 3 * (amount of code length codes) bits*/ |
embeddedartists | 0:a771927a62fd | 967 | |
embeddedartists | 0:a771927a62fd | 968 | bitlen_cl = (unsigned*)lodepng_malloc(NUM_CODE_LENGTH_CODES * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 969 | if(!bitlen_cl) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 970 | |
embeddedartists | 0:a771927a62fd | 971 | for(i = 0; i < NUM_CODE_LENGTH_CODES; i++) |
embeddedartists | 0:a771927a62fd | 972 | { |
embeddedartists | 0:a771927a62fd | 973 | if(i < HCLEN) bitlen_cl[CLCL_ORDER[i]] = readBitsFromStream(bp, in, 3); |
embeddedartists | 0:a771927a62fd | 974 | else bitlen_cl[CLCL_ORDER[i]] = 0; /*if not, it must stay 0*/ |
embeddedartists | 0:a771927a62fd | 975 | } |
embeddedartists | 0:a771927a62fd | 976 | |
embeddedartists | 0:a771927a62fd | 977 | error = HuffmanTree_makeFromLengths(&tree_cl, bitlen_cl, NUM_CODE_LENGTH_CODES, 7); |
embeddedartists | 0:a771927a62fd | 978 | if(error) break; |
embeddedartists | 0:a771927a62fd | 979 | |
embeddedartists | 0:a771927a62fd | 980 | /*now we can use this tree to read the lengths for the tree that this function will return*/ |
embeddedartists | 0:a771927a62fd | 981 | bitlen_ll = (unsigned*)lodepng_malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 982 | bitlen_d = (unsigned*)lodepng_malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned)); |
embeddedartists | 0:a771927a62fd | 983 | if(!bitlen_ll || !bitlen_d) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 984 | for(i = 0; i < NUM_DEFLATE_CODE_SYMBOLS; i++) bitlen_ll[i] = 0; |
embeddedartists | 0:a771927a62fd | 985 | for(i = 0; i < NUM_DISTANCE_SYMBOLS; i++) bitlen_d[i] = 0; |
embeddedartists | 0:a771927a62fd | 986 | |
embeddedartists | 0:a771927a62fd | 987 | /*i is the current symbol we're reading in the part that contains the code lengths of lit/len and dist codes*/ |
embeddedartists | 0:a771927a62fd | 988 | i = 0; |
embeddedartists | 0:a771927a62fd | 989 | while(i < HLIT + HDIST) |
embeddedartists | 0:a771927a62fd | 990 | { |
embeddedartists | 0:a771927a62fd | 991 | unsigned code = huffmanDecodeSymbol(in, bp, &tree_cl, inbitlength); |
embeddedartists | 0:a771927a62fd | 992 | if(code <= 15) /*a length code*/ |
embeddedartists | 0:a771927a62fd | 993 | { |
embeddedartists | 0:a771927a62fd | 994 | if(i < HLIT) bitlen_ll[i] = code; |
embeddedartists | 0:a771927a62fd | 995 | else bitlen_d[i - HLIT] = code; |
embeddedartists | 0:a771927a62fd | 996 | i++; |
embeddedartists | 0:a771927a62fd | 997 | } |
embeddedartists | 0:a771927a62fd | 998 | else if(code == 16) /*repeat previous*/ |
embeddedartists | 0:a771927a62fd | 999 | { |
embeddedartists | 0:a771927a62fd | 1000 | unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/ |
embeddedartists | 0:a771927a62fd | 1001 | unsigned value; /*set value to the previous code*/ |
embeddedartists | 0:a771927a62fd | 1002 | |
embeddedartists | 0:a771927a62fd | 1003 | if(*bp >= inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ |
embeddedartists | 0:a771927a62fd | 1004 | if (i == 0) ERROR_BREAK(54); /*can't repeat previous if i is 0*/ |
embeddedartists | 0:a771927a62fd | 1005 | |
embeddedartists | 0:a771927a62fd | 1006 | replength += readBitsFromStream(bp, in, 2); |
embeddedartists | 0:a771927a62fd | 1007 | |
embeddedartists | 0:a771927a62fd | 1008 | if(i < HLIT + 1) value = bitlen_ll[i - 1]; |
embeddedartists | 0:a771927a62fd | 1009 | else value = bitlen_d[i - HLIT - 1]; |
embeddedartists | 0:a771927a62fd | 1010 | /*repeat this value in the next lengths*/ |
embeddedartists | 0:a771927a62fd | 1011 | for(n = 0; n < replength; n++) |
embeddedartists | 0:a771927a62fd | 1012 | { |
embeddedartists | 0:a771927a62fd | 1013 | if(i >= HLIT + HDIST) ERROR_BREAK(13); /*error: i is larger than the amount of codes*/ |
embeddedartists | 0:a771927a62fd | 1014 | if(i < HLIT) bitlen_ll[i] = value; |
embeddedartists | 0:a771927a62fd | 1015 | else bitlen_d[i - HLIT] = value; |
embeddedartists | 0:a771927a62fd | 1016 | i++; |
embeddedartists | 0:a771927a62fd | 1017 | } |
embeddedartists | 0:a771927a62fd | 1018 | } |
embeddedartists | 0:a771927a62fd | 1019 | else if(code == 17) /*repeat "0" 3-10 times*/ |
embeddedartists | 0:a771927a62fd | 1020 | { |
embeddedartists | 0:a771927a62fd | 1021 | unsigned replength = 3; /*read in the bits that indicate repeat length*/ |
embeddedartists | 0:a771927a62fd | 1022 | if(*bp >= inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ |
embeddedartists | 0:a771927a62fd | 1023 | |
embeddedartists | 0:a771927a62fd | 1024 | replength += readBitsFromStream(bp, in, 3); |
embeddedartists | 0:a771927a62fd | 1025 | |
embeddedartists | 0:a771927a62fd | 1026 | /*repeat this value in the next lengths*/ |
embeddedartists | 0:a771927a62fd | 1027 | for(n = 0; n < replength; n++) |
embeddedartists | 0:a771927a62fd | 1028 | { |
embeddedartists | 0:a771927a62fd | 1029 | if(i >= HLIT + HDIST) ERROR_BREAK(14); /*error: i is larger than the amount of codes*/ |
embeddedartists | 0:a771927a62fd | 1030 | |
embeddedartists | 0:a771927a62fd | 1031 | if(i < HLIT) bitlen_ll[i] = 0; |
embeddedartists | 0:a771927a62fd | 1032 | else bitlen_d[i - HLIT] = 0; |
embeddedartists | 0:a771927a62fd | 1033 | i++; |
embeddedartists | 0:a771927a62fd | 1034 | } |
embeddedartists | 0:a771927a62fd | 1035 | } |
embeddedartists | 0:a771927a62fd | 1036 | else if(code == 18) /*repeat "0" 11-138 times*/ |
embeddedartists | 0:a771927a62fd | 1037 | { |
embeddedartists | 0:a771927a62fd | 1038 | unsigned replength = 11; /*read in the bits that indicate repeat length*/ |
embeddedartists | 0:a771927a62fd | 1039 | if(*bp >= inbitlength) ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ |
embeddedartists | 0:a771927a62fd | 1040 | |
embeddedartists | 0:a771927a62fd | 1041 | replength += readBitsFromStream(bp, in, 7); |
embeddedartists | 0:a771927a62fd | 1042 | |
embeddedartists | 0:a771927a62fd | 1043 | /*repeat this value in the next lengths*/ |
embeddedartists | 0:a771927a62fd | 1044 | for(n = 0; n < replength; n++) |
embeddedartists | 0:a771927a62fd | 1045 | { |
embeddedartists | 0:a771927a62fd | 1046 | if(i >= HLIT + HDIST) ERROR_BREAK(15); /*error: i is larger than the amount of codes*/ |
embeddedartists | 0:a771927a62fd | 1047 | |
embeddedartists | 0:a771927a62fd | 1048 | if(i < HLIT) bitlen_ll[i] = 0; |
embeddedartists | 0:a771927a62fd | 1049 | else bitlen_d[i - HLIT] = 0; |
embeddedartists | 0:a771927a62fd | 1050 | i++; |
embeddedartists | 0:a771927a62fd | 1051 | } |
embeddedartists | 0:a771927a62fd | 1052 | } |
embeddedartists | 0:a771927a62fd | 1053 | else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ |
embeddedartists | 0:a771927a62fd | 1054 | { |
embeddedartists | 0:a771927a62fd | 1055 | if(code == (unsigned)(-1)) |
embeddedartists | 0:a771927a62fd | 1056 | { |
embeddedartists | 0:a771927a62fd | 1057 | /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol |
embeddedartists | 0:a771927a62fd | 1058 | (10=no endcode, 11=wrong jump outside of tree)*/ |
embeddedartists | 0:a771927a62fd | 1059 | error = (*bp) > inbitlength ? 10 : 11; |
embeddedartists | 0:a771927a62fd | 1060 | } |
embeddedartists | 0:a771927a62fd | 1061 | else error = 16; /*unexisting code, this can never happen*/ |
embeddedartists | 0:a771927a62fd | 1062 | break; |
embeddedartists | 0:a771927a62fd | 1063 | } |
embeddedartists | 0:a771927a62fd | 1064 | } |
embeddedartists | 0:a771927a62fd | 1065 | if(error) break; |
embeddedartists | 0:a771927a62fd | 1066 | |
embeddedartists | 0:a771927a62fd | 1067 | if(bitlen_ll[256] == 0) ERROR_BREAK(64); /*the length of the end code 256 must be larger than 0*/ |
embeddedartists | 0:a771927a62fd | 1068 | |
embeddedartists | 0:a771927a62fd | 1069 | /*now we've finally got HLIT and HDIST, so generate the code trees, and the function is done*/ |
embeddedartists | 0:a771927a62fd | 1070 | error = HuffmanTree_makeFromLengths(tree_ll, bitlen_ll, NUM_DEFLATE_CODE_SYMBOLS, 15); |
embeddedartists | 0:a771927a62fd | 1071 | if(error) break; |
embeddedartists | 0:a771927a62fd | 1072 | error = HuffmanTree_makeFromLengths(tree_d, bitlen_d, NUM_DISTANCE_SYMBOLS, 15); |
embeddedartists | 0:a771927a62fd | 1073 | |
embeddedartists | 0:a771927a62fd | 1074 | break; /*end of error-while*/ |
embeddedartists | 0:a771927a62fd | 1075 | } |
embeddedartists | 0:a771927a62fd | 1076 | |
embeddedartists | 0:a771927a62fd | 1077 | lodepng_free(bitlen_cl); |
embeddedartists | 0:a771927a62fd | 1078 | lodepng_free(bitlen_ll); |
embeddedartists | 0:a771927a62fd | 1079 | lodepng_free(bitlen_d); |
embeddedartists | 0:a771927a62fd | 1080 | HuffmanTree_cleanup(&tree_cl); |
embeddedartists | 0:a771927a62fd | 1081 | |
embeddedartists | 0:a771927a62fd | 1082 | return error; |
embeddedartists | 0:a771927a62fd | 1083 | } |
embeddedartists | 0:a771927a62fd | 1084 | |
embeddedartists | 0:a771927a62fd | 1085 | /*inflate a block with dynamic of fixed Huffman tree*/ |
embeddedartists | 0:a771927a62fd | 1086 | static unsigned inflateHuffmanBlock(ucvector* out, const unsigned char* in, size_t* bp, |
embeddedartists | 0:a771927a62fd | 1087 | size_t* pos, size_t inlength, unsigned btype) |
embeddedartists | 0:a771927a62fd | 1088 | { |
embeddedartists | 0:a771927a62fd | 1089 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 1090 | HuffmanTree tree_ll; /*the huffman tree for literal and length codes*/ |
embeddedartists | 0:a771927a62fd | 1091 | HuffmanTree tree_d; /*the huffman tree for distance codes*/ |
embeddedartists | 0:a771927a62fd | 1092 | size_t inbitlength = inlength * 8; |
embeddedartists | 0:a771927a62fd | 1093 | |
embeddedartists | 0:a771927a62fd | 1094 | HuffmanTree_init(&tree_ll); |
embeddedartists | 0:a771927a62fd | 1095 | HuffmanTree_init(&tree_d); |
embeddedartists | 0:a771927a62fd | 1096 | |
embeddedartists | 0:a771927a62fd | 1097 | if(btype == 1) getTreeInflateFixed(&tree_ll, &tree_d); |
embeddedartists | 0:a771927a62fd | 1098 | else if(btype == 2) error = getTreeInflateDynamic(&tree_ll, &tree_d, in, bp, inlength); |
embeddedartists | 0:a771927a62fd | 1099 | |
embeddedartists | 0:a771927a62fd | 1100 | while(!error) /*decode all symbols until end reached, breaks at end code*/ |
embeddedartists | 0:a771927a62fd | 1101 | { |
embeddedartists | 0:a771927a62fd | 1102 | /*code_ll is literal, length or end code*/ |
embeddedartists | 0:a771927a62fd | 1103 | unsigned code_ll = huffmanDecodeSymbol(in, bp, &tree_ll, inbitlength); |
embeddedartists | 0:a771927a62fd | 1104 | if(code_ll <= 255) /*literal symbol*/ |
embeddedartists | 0:a771927a62fd | 1105 | { |
embeddedartists | 0:a771927a62fd | 1106 | if((*pos) >= out->size) |
embeddedartists | 0:a771927a62fd | 1107 | { |
embeddedartists | 0:a771927a62fd | 1108 | /*reserve more room at once*/ |
embeddedartists | 0:a771927a62fd | 1109 | if(!ucvector_resize(out, ((*pos) + 1) * 2)) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1110 | } |
embeddedartists | 0:a771927a62fd | 1111 | out->data[(*pos)] = (unsigned char)(code_ll); |
embeddedartists | 0:a771927a62fd | 1112 | (*pos)++; |
embeddedartists | 0:a771927a62fd | 1113 | } |
embeddedartists | 0:a771927a62fd | 1114 | else if(code_ll >= FIRST_LENGTH_CODE_INDEX && code_ll <= LAST_LENGTH_CODE_INDEX) /*length code*/ |
embeddedartists | 0:a771927a62fd | 1115 | { |
embeddedartists | 0:a771927a62fd | 1116 | unsigned code_d, distance; |
embeddedartists | 0:a771927a62fd | 1117 | unsigned numextrabits_l, numextrabits_d; /*extra bits for length and distance*/ |
embeddedartists | 0:a771927a62fd | 1118 | size_t start, forward, backward, length; |
embeddedartists | 0:a771927a62fd | 1119 | |
embeddedartists | 0:a771927a62fd | 1120 | /*part 1: get length base*/ |
embeddedartists | 0:a771927a62fd | 1121 | length = LENGTHBASE[code_ll - FIRST_LENGTH_CODE_INDEX]; |
embeddedartists | 0:a771927a62fd | 1122 | |
embeddedartists | 0:a771927a62fd | 1123 | /*part 2: get extra bits and add the value of that to length*/ |
embeddedartists | 0:a771927a62fd | 1124 | numextrabits_l = LENGTHEXTRA[code_ll - FIRST_LENGTH_CODE_INDEX]; |
embeddedartists | 0:a771927a62fd | 1125 | if(*bp >= inbitlength) ERROR_BREAK(51); /*error, bit pointer will jump past memory*/ |
embeddedartists | 0:a771927a62fd | 1126 | length += readBitsFromStream(bp, in, numextrabits_l); |
embeddedartists | 0:a771927a62fd | 1127 | |
embeddedartists | 0:a771927a62fd | 1128 | /*part 3: get distance code*/ |
embeddedartists | 0:a771927a62fd | 1129 | code_d = huffmanDecodeSymbol(in, bp, &tree_d, inbitlength); |
embeddedartists | 0:a771927a62fd | 1130 | if(code_d > 29) |
embeddedartists | 0:a771927a62fd | 1131 | { |
embeddedartists | 0:a771927a62fd | 1132 | if(code_ll == (unsigned)(-1)) /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ |
embeddedartists | 0:a771927a62fd | 1133 | { |
embeddedartists | 0:a771927a62fd | 1134 | /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol |
embeddedartists | 0:a771927a62fd | 1135 | (10=no endcode, 11=wrong jump outside of tree)*/ |
embeddedartists | 0:a771927a62fd | 1136 | error = (*bp) > inlength * 8 ? 10 : 11; |
embeddedartists | 0:a771927a62fd | 1137 | } |
embeddedartists | 0:a771927a62fd | 1138 | else error = 18; /*error: invalid distance code (30-31 are never used)*/ |
embeddedartists | 0:a771927a62fd | 1139 | break; |
embeddedartists | 0:a771927a62fd | 1140 | } |
embeddedartists | 0:a771927a62fd | 1141 | distance = DISTANCEBASE[code_d]; |
embeddedartists | 0:a771927a62fd | 1142 | |
embeddedartists | 0:a771927a62fd | 1143 | /*part 4: get extra bits from distance*/ |
embeddedartists | 0:a771927a62fd | 1144 | numextrabits_d = DISTANCEEXTRA[code_d]; |
embeddedartists | 0:a771927a62fd | 1145 | if(*bp >= inbitlength) ERROR_BREAK(51); /*error, bit pointer will jump past memory*/ |
embeddedartists | 0:a771927a62fd | 1146 | |
embeddedartists | 0:a771927a62fd | 1147 | distance += readBitsFromStream(bp, in, numextrabits_d); |
embeddedartists | 0:a771927a62fd | 1148 | |
embeddedartists | 0:a771927a62fd | 1149 | /*part 5: fill in all the out[n] values based on the length and dist*/ |
embeddedartists | 0:a771927a62fd | 1150 | start = (*pos); |
embeddedartists | 0:a771927a62fd | 1151 | if(distance > start) ERROR_BREAK(52); /*too long backward distance*/ |
embeddedartists | 0:a771927a62fd | 1152 | backward = start - distance; |
embeddedartists | 0:a771927a62fd | 1153 | if((*pos) + length >= out->size) |
embeddedartists | 0:a771927a62fd | 1154 | { |
embeddedartists | 0:a771927a62fd | 1155 | /*reserve more room at once*/ |
embeddedartists | 0:a771927a62fd | 1156 | if(!ucvector_resize(out, ((*pos) + length) * 2)) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1157 | } |
embeddedartists | 0:a771927a62fd | 1158 | |
embeddedartists | 0:a771927a62fd | 1159 | for(forward = 0; forward < length; forward++) |
embeddedartists | 0:a771927a62fd | 1160 | { |
embeddedartists | 0:a771927a62fd | 1161 | out->data[(*pos)] = out->data[backward]; |
embeddedartists | 0:a771927a62fd | 1162 | (*pos)++; |
embeddedartists | 0:a771927a62fd | 1163 | backward++; |
embeddedartists | 0:a771927a62fd | 1164 | if(backward >= start) backward = start - distance; |
embeddedartists | 0:a771927a62fd | 1165 | } |
embeddedartists | 0:a771927a62fd | 1166 | } |
embeddedartists | 0:a771927a62fd | 1167 | else if(code_ll == 256) |
embeddedartists | 0:a771927a62fd | 1168 | { |
embeddedartists | 0:a771927a62fd | 1169 | break; /*end code, break the loop*/ |
embeddedartists | 0:a771927a62fd | 1170 | } |
embeddedartists | 0:a771927a62fd | 1171 | else /*if(code == (unsigned)(-1))*/ /*huffmanDecodeSymbol returns (unsigned)(-1) in case of error*/ |
embeddedartists | 0:a771927a62fd | 1172 | { |
embeddedartists | 0:a771927a62fd | 1173 | /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol |
embeddedartists | 0:a771927a62fd | 1174 | (10=no endcode, 11=wrong jump outside of tree)*/ |
embeddedartists | 0:a771927a62fd | 1175 | error = (*bp) > inlength * 8 ? 10 : 11; |
embeddedartists | 0:a771927a62fd | 1176 | break; |
embeddedartists | 0:a771927a62fd | 1177 | } |
embeddedartists | 0:a771927a62fd | 1178 | } |
embeddedartists | 0:a771927a62fd | 1179 | |
embeddedartists | 0:a771927a62fd | 1180 | HuffmanTree_cleanup(&tree_ll); |
embeddedartists | 0:a771927a62fd | 1181 | HuffmanTree_cleanup(&tree_d); |
embeddedartists | 0:a771927a62fd | 1182 | |
embeddedartists | 0:a771927a62fd | 1183 | return error; |
embeddedartists | 0:a771927a62fd | 1184 | } |
embeddedartists | 0:a771927a62fd | 1185 | |
embeddedartists | 0:a771927a62fd | 1186 | static unsigned inflateNoCompression(ucvector* out, const unsigned char* in, size_t* bp, size_t* pos, size_t inlength) |
embeddedartists | 0:a771927a62fd | 1187 | { |
embeddedartists | 0:a771927a62fd | 1188 | /*go to first boundary of byte*/ |
embeddedartists | 0:a771927a62fd | 1189 | size_t p; |
embeddedartists | 0:a771927a62fd | 1190 | unsigned LEN, NLEN, n, error = 0; |
embeddedartists | 0:a771927a62fd | 1191 | while(((*bp) & 0x7) != 0) (*bp)++; |
embeddedartists | 0:a771927a62fd | 1192 | p = (*bp) / 8; /*byte position*/ |
embeddedartists | 0:a771927a62fd | 1193 | |
embeddedartists | 0:a771927a62fd | 1194 | /*read LEN (2 bytes) and NLEN (2 bytes)*/ |
embeddedartists | 0:a771927a62fd | 1195 | if(p >= inlength - 4) return 52; /*error, bit pointer will jump past memory*/ |
embeddedartists | 0:a771927a62fd | 1196 | LEN = in[p] + 256 * in[p + 1]; p += 2; |
embeddedartists | 0:a771927a62fd | 1197 | NLEN = in[p] + 256 * in[p + 1]; p += 2; |
embeddedartists | 0:a771927a62fd | 1198 | |
embeddedartists | 0:a771927a62fd | 1199 | /*check if 16-bit NLEN is really the one's complement of LEN*/ |
embeddedartists | 0:a771927a62fd | 1200 | if(LEN + NLEN != 65535) return 21; /*error: NLEN is not one's complement of LEN*/ |
embeddedartists | 0:a771927a62fd | 1201 | |
embeddedartists | 0:a771927a62fd | 1202 | if((*pos) + LEN >= out->size) |
embeddedartists | 0:a771927a62fd | 1203 | { |
embeddedartists | 0:a771927a62fd | 1204 | if(!ucvector_resize(out, (*pos) + LEN)) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 1205 | } |
embeddedartists | 0:a771927a62fd | 1206 | |
embeddedartists | 0:a771927a62fd | 1207 | /*read the literal data: LEN bytes are now stored in the out buffer*/ |
embeddedartists | 0:a771927a62fd | 1208 | if(p + LEN > inlength) return 23; /*error: reading outside of in buffer*/ |
embeddedartists | 0:a771927a62fd | 1209 | for(n = 0; n < LEN; n++) out->data[(*pos)++] = in[p++]; |
embeddedartists | 0:a771927a62fd | 1210 | |
embeddedartists | 0:a771927a62fd | 1211 | (*bp) = p * 8; |
embeddedartists | 0:a771927a62fd | 1212 | |
embeddedartists | 0:a771927a62fd | 1213 | return error; |
embeddedartists | 0:a771927a62fd | 1214 | } |
embeddedartists | 0:a771927a62fd | 1215 | |
embeddedartists | 0:a771927a62fd | 1216 | static unsigned lodepng_inflatev(ucvector* out, |
embeddedartists | 0:a771927a62fd | 1217 | const unsigned char* in, size_t insize, |
embeddedartists | 0:a771927a62fd | 1218 | const LodePNGDecompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 1219 | { |
embeddedartists | 0:a771927a62fd | 1220 | /*bit pointer in the "in" data, current byte is bp >> 3, current bit is bp & 0x7 (from lsb to msb of the byte)*/ |
embeddedartists | 0:a771927a62fd | 1221 | size_t bp = 0; |
embeddedartists | 0:a771927a62fd | 1222 | unsigned BFINAL = 0; |
embeddedartists | 0:a771927a62fd | 1223 | size_t pos = 0; /*byte position in the out buffer*/ |
embeddedartists | 0:a771927a62fd | 1224 | |
embeddedartists | 0:a771927a62fd | 1225 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 1226 | |
embeddedartists | 0:a771927a62fd | 1227 | (void)settings; |
embeddedartists | 0:a771927a62fd | 1228 | |
embeddedartists | 0:a771927a62fd | 1229 | while(!BFINAL) |
embeddedartists | 0:a771927a62fd | 1230 | { |
embeddedartists | 0:a771927a62fd | 1231 | unsigned BTYPE; |
embeddedartists | 0:a771927a62fd | 1232 | if(bp + 2 >= insize * 8) return 52; /*error, bit pointer will jump past memory*/ |
embeddedartists | 0:a771927a62fd | 1233 | BFINAL = readBitFromStream(&bp, in); |
embeddedartists | 0:a771927a62fd | 1234 | BTYPE = 1 * readBitFromStream(&bp, in); |
embeddedartists | 0:a771927a62fd | 1235 | BTYPE += 2 * readBitFromStream(&bp, in); |
embeddedartists | 0:a771927a62fd | 1236 | |
embeddedartists | 0:a771927a62fd | 1237 | if(BTYPE == 3) return 20; /*error: invalid BTYPE*/ |
embeddedartists | 0:a771927a62fd | 1238 | else if(BTYPE == 0) error = inflateNoCompression(out, in, &bp, &pos, insize); /*no compression*/ |
embeddedartists | 0:a771927a62fd | 1239 | else error = inflateHuffmanBlock(out, in, &bp, &pos, insize, BTYPE); /*compression, BTYPE 01 or 10*/ |
embeddedartists | 0:a771927a62fd | 1240 | |
embeddedartists | 0:a771927a62fd | 1241 | if(error) return error; |
embeddedartists | 0:a771927a62fd | 1242 | } |
embeddedartists | 0:a771927a62fd | 1243 | |
embeddedartists | 0:a771927a62fd | 1244 | /*Only now we know the true size of out, resize it to that*/ |
embeddedartists | 0:a771927a62fd | 1245 | if(!ucvector_resize(out, pos)) error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 1246 | |
embeddedartists | 0:a771927a62fd | 1247 | return error; |
embeddedartists | 0:a771927a62fd | 1248 | } |
embeddedartists | 0:a771927a62fd | 1249 | |
embeddedartists | 0:a771927a62fd | 1250 | unsigned lodepng_inflate(unsigned char** out, size_t* outsize, |
embeddedartists | 0:a771927a62fd | 1251 | const unsigned char* in, size_t insize, |
embeddedartists | 0:a771927a62fd | 1252 | const LodePNGDecompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 1253 | { |
embeddedartists | 0:a771927a62fd | 1254 | unsigned error; |
embeddedartists | 0:a771927a62fd | 1255 | ucvector v; |
embeddedartists | 0:a771927a62fd | 1256 | ucvector_init_buffer(&v, *out, *outsize); |
embeddedartists | 0:a771927a62fd | 1257 | error = lodepng_inflatev(&v, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 1258 | *out = v.data; |
embeddedartists | 0:a771927a62fd | 1259 | *outsize = v.size; |
embeddedartists | 0:a771927a62fd | 1260 | return error; |
embeddedartists | 0:a771927a62fd | 1261 | } |
embeddedartists | 0:a771927a62fd | 1262 | |
embeddedartists | 0:a771927a62fd | 1263 | static unsigned inflate(unsigned char** out, size_t* outsize, |
embeddedartists | 0:a771927a62fd | 1264 | const unsigned char* in, size_t insize, |
embeddedartists | 0:a771927a62fd | 1265 | const LodePNGDecompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 1266 | { |
embeddedartists | 0:a771927a62fd | 1267 | if(settings->custom_inflate) |
embeddedartists | 0:a771927a62fd | 1268 | { |
embeddedartists | 0:a771927a62fd | 1269 | return settings->custom_inflate(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 1270 | } |
embeddedartists | 0:a771927a62fd | 1271 | else |
embeddedartists | 0:a771927a62fd | 1272 | { |
embeddedartists | 0:a771927a62fd | 1273 | return lodepng_inflate(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 1274 | } |
embeddedartists | 0:a771927a62fd | 1275 | } |
embeddedartists | 0:a771927a62fd | 1276 | |
embeddedartists | 0:a771927a62fd | 1277 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 1278 | |
embeddedartists | 0:a771927a62fd | 1279 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 1280 | |
embeddedartists | 0:a771927a62fd | 1281 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 1282 | /* / Deflator (Compressor) / */ |
embeddedartists | 0:a771927a62fd | 1283 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 1284 | |
embeddedartists | 0:a771927a62fd | 1285 | static const size_t MAX_SUPPORTED_DEFLATE_LENGTH = 258; |
embeddedartists | 0:a771927a62fd | 1286 | |
embeddedartists | 0:a771927a62fd | 1287 | /*bitlen is the size in bits of the code*/ |
embeddedartists | 0:a771927a62fd | 1288 | static void addHuffmanSymbol(size_t* bp, ucvector* compressed, unsigned code, unsigned bitlen) |
embeddedartists | 0:a771927a62fd | 1289 | { |
embeddedartists | 0:a771927a62fd | 1290 | addBitsToStreamReversed(bp, compressed, code, bitlen); |
embeddedartists | 0:a771927a62fd | 1291 | } |
embeddedartists | 0:a771927a62fd | 1292 | |
embeddedartists | 0:a771927a62fd | 1293 | /*search the index in the array, that has the largest value smaller than or equal to the given value, |
embeddedartists | 0:a771927a62fd | 1294 | given array must be sorted (if no value is smaller, it returns the size of the given array)*/ |
embeddedartists | 0:a771927a62fd | 1295 | static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value) |
embeddedartists | 0:a771927a62fd | 1296 | { |
embeddedartists | 0:a771927a62fd | 1297 | /*linear search implementation*/ |
embeddedartists | 0:a771927a62fd | 1298 | /*for(size_t i = 1; i < array_size; i++) if(array[i] > value) return i - 1; |
embeddedartists | 0:a771927a62fd | 1299 | return array_size - 1;*/ |
embeddedartists | 0:a771927a62fd | 1300 | |
embeddedartists | 0:a771927a62fd | 1301 | /*binary search implementation (not that much faster) (precondition: array_size > 0)*/ |
embeddedartists | 0:a771927a62fd | 1302 | size_t left = 1; |
embeddedartists | 0:a771927a62fd | 1303 | size_t right = array_size - 1; |
embeddedartists | 0:a771927a62fd | 1304 | while(left <= right) |
embeddedartists | 0:a771927a62fd | 1305 | { |
embeddedartists | 0:a771927a62fd | 1306 | size_t mid = (left + right) / 2; |
embeddedartists | 0:a771927a62fd | 1307 | if(array[mid] <= value) left = mid + 1; /*the value to find is more to the right*/ |
embeddedartists | 0:a771927a62fd | 1308 | else if(array[mid - 1] > value) right = mid - 1; /*the value to find is more to the left*/ |
embeddedartists | 0:a771927a62fd | 1309 | else return mid - 1; |
embeddedartists | 0:a771927a62fd | 1310 | } |
embeddedartists | 0:a771927a62fd | 1311 | return array_size - 1; |
embeddedartists | 0:a771927a62fd | 1312 | } |
embeddedartists | 0:a771927a62fd | 1313 | |
embeddedartists | 0:a771927a62fd | 1314 | static void addLengthDistance(uivector* values, size_t length, size_t distance) |
embeddedartists | 0:a771927a62fd | 1315 | { |
embeddedartists | 0:a771927a62fd | 1316 | /*values in encoded vector are those used by deflate: |
embeddedartists | 0:a771927a62fd | 1317 | 0-255: literal bytes |
embeddedartists | 0:a771927a62fd | 1318 | 256: end |
embeddedartists | 0:a771927a62fd | 1319 | 257-285: length/distance pair (length code, followed by extra length bits, distance code, extra distance bits) |
embeddedartists | 0:a771927a62fd | 1320 | 286-287: invalid*/ |
embeddedartists | 0:a771927a62fd | 1321 | |
embeddedartists | 0:a771927a62fd | 1322 | unsigned length_code = (unsigned)searchCodeIndex(LENGTHBASE, 29, length); |
embeddedartists | 0:a771927a62fd | 1323 | unsigned extra_length = (unsigned)(length - LENGTHBASE[length_code]); |
embeddedartists | 0:a771927a62fd | 1324 | unsigned dist_code = (unsigned)searchCodeIndex(DISTANCEBASE, 30, distance); |
embeddedartists | 0:a771927a62fd | 1325 | unsigned extra_distance = (unsigned)(distance - DISTANCEBASE[dist_code]); |
embeddedartists | 0:a771927a62fd | 1326 | |
embeddedartists | 0:a771927a62fd | 1327 | uivector_push_back(values, length_code + FIRST_LENGTH_CODE_INDEX); |
embeddedartists | 0:a771927a62fd | 1328 | uivector_push_back(values, extra_length); |
embeddedartists | 0:a771927a62fd | 1329 | uivector_push_back(values, dist_code); |
embeddedartists | 0:a771927a62fd | 1330 | uivector_push_back(values, extra_distance); |
embeddedartists | 0:a771927a62fd | 1331 | } |
embeddedartists | 0:a771927a62fd | 1332 | |
embeddedartists | 0:a771927a62fd | 1333 | static const unsigned HASH_BIT_MASK = 65535; |
embeddedartists | 0:a771927a62fd | 1334 | static const unsigned HASH_NUM_VALUES = 65536; |
embeddedartists | 0:a771927a62fd | 1335 | static const unsigned HASH_NUM_CHARACTERS = 3; |
embeddedartists | 0:a771927a62fd | 1336 | static const unsigned HASH_SHIFT = 2; |
embeddedartists | 0:a771927a62fd | 1337 | /* |
embeddedartists | 0:a771927a62fd | 1338 | The HASH_NUM_CHARACTERS value is used to make encoding faster by using longer |
embeddedartists | 0:a771927a62fd | 1339 | sequences to generate a hash value from the stream bytes. Setting it to 3 |
embeddedartists | 0:a771927a62fd | 1340 | gives exactly the same compression as the brute force method, since deflate's |
embeddedartists | 0:a771927a62fd | 1341 | run length encoding starts with lengths of 3. Setting it to higher values, |
embeddedartists | 0:a771927a62fd | 1342 | like 6, can make the encoding faster (not always though!), but will cause the |
embeddedartists | 0:a771927a62fd | 1343 | encoding to miss any length between 3 and this value, so that the compression |
embeddedartists | 0:a771927a62fd | 1344 | may be worse (but this can vary too depending on the image, sometimes it is |
embeddedartists | 0:a771927a62fd | 1345 | even a bit better instead). |
embeddedartists | 0:a771927a62fd | 1346 | The HASH_NUM_VALUES is the amount of unique possible hash values that |
embeddedartists | 0:a771927a62fd | 1347 | combinations of bytes can give, the higher it is the more memory is needed, but |
embeddedartists | 0:a771927a62fd | 1348 | if it's too low the advantage of hashing is gone. |
embeddedartists | 0:a771927a62fd | 1349 | */ |
embeddedartists | 0:a771927a62fd | 1350 | |
embeddedartists | 0:a771927a62fd | 1351 | typedef struct Hash |
embeddedartists | 0:a771927a62fd | 1352 | { |
embeddedartists | 0:a771927a62fd | 1353 | int* head; /*hash value to head circular pos*/ |
embeddedartists | 0:a771927a62fd | 1354 | int* val; /*circular pos to hash value*/ |
embeddedartists | 0:a771927a62fd | 1355 | /*circular pos to prev circular pos*/ |
embeddedartists | 0:a771927a62fd | 1356 | unsigned short* chain; |
embeddedartists | 0:a771927a62fd | 1357 | unsigned short* zeros; |
embeddedartists | 0:a771927a62fd | 1358 | } Hash; |
embeddedartists | 0:a771927a62fd | 1359 | |
embeddedartists | 0:a771927a62fd | 1360 | static unsigned hash_init(Hash* hash, unsigned windowsize) |
embeddedartists | 0:a771927a62fd | 1361 | { |
embeddedartists | 0:a771927a62fd | 1362 | unsigned i; |
embeddedartists | 0:a771927a62fd | 1363 | hash->head = (int*)lodepng_malloc(sizeof(int) * HASH_NUM_VALUES); |
embeddedartists | 0:a771927a62fd | 1364 | hash->val = (int*)lodepng_malloc(sizeof(int) * windowsize); |
embeddedartists | 0:a771927a62fd | 1365 | hash->chain = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize); |
embeddedartists | 0:a771927a62fd | 1366 | hash->zeros = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize); |
embeddedartists | 0:a771927a62fd | 1367 | |
embeddedartists | 0:a771927a62fd | 1368 | if(!hash->head || !hash->val || !hash->chain || !hash->zeros) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 1369 | |
embeddedartists | 0:a771927a62fd | 1370 | /*initialize hash table*/ |
embeddedartists | 0:a771927a62fd | 1371 | for(i = 0; i < HASH_NUM_VALUES; i++) hash->head[i] = -1; |
embeddedartists | 0:a771927a62fd | 1372 | for(i = 0; i < windowsize; i++) hash->val[i] = -1; |
embeddedartists | 0:a771927a62fd | 1373 | for(i = 0; i < windowsize; i++) hash->chain[i] = i; /*same value as index indicates uninitialized*/ |
embeddedartists | 0:a771927a62fd | 1374 | |
embeddedartists | 0:a771927a62fd | 1375 | return 0; |
embeddedartists | 0:a771927a62fd | 1376 | } |
embeddedartists | 0:a771927a62fd | 1377 | |
embeddedartists | 0:a771927a62fd | 1378 | static void hash_cleanup(Hash* hash) |
embeddedartists | 0:a771927a62fd | 1379 | { |
embeddedartists | 0:a771927a62fd | 1380 | lodepng_free(hash->head); |
embeddedartists | 0:a771927a62fd | 1381 | lodepng_free(hash->val); |
embeddedartists | 0:a771927a62fd | 1382 | lodepng_free(hash->chain); |
embeddedartists | 0:a771927a62fd | 1383 | lodepng_free(hash->zeros); |
embeddedartists | 0:a771927a62fd | 1384 | } |
embeddedartists | 0:a771927a62fd | 1385 | |
embeddedartists | 0:a771927a62fd | 1386 | static unsigned getHash(const unsigned char* data, size_t size, size_t pos) |
embeddedartists | 0:a771927a62fd | 1387 | { |
embeddedartists | 0:a771927a62fd | 1388 | unsigned result = 0; |
embeddedartists | 0:a771927a62fd | 1389 | if (HASH_NUM_CHARACTERS == 3 && pos + 2 < size) { |
embeddedartists | 0:a771927a62fd | 1390 | result ^= (data[pos + 0] << (0 * HASH_SHIFT)); |
embeddedartists | 0:a771927a62fd | 1391 | result ^= (data[pos + 1] << (1 * HASH_SHIFT)); |
embeddedartists | 0:a771927a62fd | 1392 | result ^= (data[pos + 2] << (2 * HASH_SHIFT)); |
embeddedartists | 0:a771927a62fd | 1393 | } else { |
embeddedartists | 0:a771927a62fd | 1394 | size_t amount, i; |
embeddedartists | 0:a771927a62fd | 1395 | if(pos >= size) return 0; |
embeddedartists | 0:a771927a62fd | 1396 | amount = HASH_NUM_CHARACTERS; |
embeddedartists | 0:a771927a62fd | 1397 | if(pos + amount >= size) amount = size - pos; |
embeddedartists | 0:a771927a62fd | 1398 | for(i = 0; i < amount; i++) result ^= (data[pos + i] << (i * HASH_SHIFT)); |
embeddedartists | 0:a771927a62fd | 1399 | } |
embeddedartists | 0:a771927a62fd | 1400 | return result & HASH_BIT_MASK; |
embeddedartists | 0:a771927a62fd | 1401 | } |
embeddedartists | 0:a771927a62fd | 1402 | |
embeddedartists | 0:a771927a62fd | 1403 | static unsigned countZeros(const unsigned char* data, size_t size, size_t pos) |
embeddedartists | 0:a771927a62fd | 1404 | { |
embeddedartists | 0:a771927a62fd | 1405 | const unsigned char* start = data + pos; |
embeddedartists | 0:a771927a62fd | 1406 | const unsigned char* end = start + MAX_SUPPORTED_DEFLATE_LENGTH; |
embeddedartists | 0:a771927a62fd | 1407 | if(end > data + size) end = data + size; |
embeddedartists | 0:a771927a62fd | 1408 | data = start; |
embeddedartists | 0:a771927a62fd | 1409 | while (data != end && *data == 0) data++; |
embeddedartists | 0:a771927a62fd | 1410 | /*subtracting two addresses returned as 32-bit number (max value is MAX_SUPPORTED_DEFLATE_LENGTH)*/ |
embeddedartists | 0:a771927a62fd | 1411 | return (unsigned)(data - start); |
embeddedartists | 0:a771927a62fd | 1412 | } |
embeddedartists | 0:a771927a62fd | 1413 | |
embeddedartists | 0:a771927a62fd | 1414 | /*wpos = pos & (windowsize - 1)*/ |
embeddedartists | 0:a771927a62fd | 1415 | static void updateHashChain(Hash* hash, size_t wpos, int hashval) |
embeddedartists | 0:a771927a62fd | 1416 | { |
embeddedartists | 0:a771927a62fd | 1417 | hash->val[wpos] = hashval; |
embeddedartists | 0:a771927a62fd | 1418 | if(hash->head[hashval] != -1) hash->chain[wpos] = hash->head[hashval]; |
embeddedartists | 0:a771927a62fd | 1419 | hash->head[hashval] = wpos; |
embeddedartists | 0:a771927a62fd | 1420 | } |
embeddedartists | 0:a771927a62fd | 1421 | |
embeddedartists | 0:a771927a62fd | 1422 | /* |
embeddedartists | 0:a771927a62fd | 1423 | LZ77-encode the data. Return value is error code. The input are raw bytes, the output |
embeddedartists | 0:a771927a62fd | 1424 | is in the form of unsigned integers with codes representing for example literal bytes, or |
embeddedartists | 0:a771927a62fd | 1425 | length/distance pairs. |
embeddedartists | 0:a771927a62fd | 1426 | It uses a hash table technique to let it encode faster. When doing LZ77 encoding, a |
embeddedartists | 0:a771927a62fd | 1427 | sliding window (of windowsize) is used, and all past bytes in that window can be used as |
embeddedartists | 0:a771927a62fd | 1428 | the "dictionary". A brute force search through all possible distances would be slow, and |
embeddedartists | 0:a771927a62fd | 1429 | this hash technique is one out of several ways to speed this up. |
embeddedartists | 0:a771927a62fd | 1430 | */ |
embeddedartists | 0:a771927a62fd | 1431 | static unsigned encodeLZ77(uivector* out, Hash* hash, |
embeddedartists | 0:a771927a62fd | 1432 | const unsigned char* in, size_t inpos, size_t insize, unsigned windowsize, |
embeddedartists | 0:a771927a62fd | 1433 | unsigned minmatch, unsigned nicematch, unsigned lazymatching) |
embeddedartists | 0:a771927a62fd | 1434 | { |
embeddedartists | 0:a771927a62fd | 1435 | unsigned pos, i, error = 0; |
embeddedartists | 0:a771927a62fd | 1436 | /*for large window lengths, assume the user wants no compression loss. Otherwise, max hash chain length speedup.*/ |
embeddedartists | 0:a771927a62fd | 1437 | unsigned maxchainlength = windowsize >= 8192 ? windowsize : windowsize / 8; |
embeddedartists | 0:a771927a62fd | 1438 | unsigned maxlazymatch = windowsize >= 8192 ? MAX_SUPPORTED_DEFLATE_LENGTH : 64; |
embeddedartists | 0:a771927a62fd | 1439 | |
embeddedartists | 0:a771927a62fd | 1440 | unsigned usezeros = 1; /*not sure if setting it to false for windowsize < 8192 is better or worse*/ |
embeddedartists | 0:a771927a62fd | 1441 | unsigned numzeros = 0; |
embeddedartists | 0:a771927a62fd | 1442 | |
embeddedartists | 0:a771927a62fd | 1443 | unsigned offset; /*the offset represents the distance in LZ77 terminology*/ |
embeddedartists | 0:a771927a62fd | 1444 | unsigned length; |
embeddedartists | 0:a771927a62fd | 1445 | unsigned lazy = 0; |
embeddedartists | 0:a771927a62fd | 1446 | unsigned lazylength = 0, lazyoffset = 0; |
embeddedartists | 0:a771927a62fd | 1447 | unsigned hashval; |
embeddedartists | 0:a771927a62fd | 1448 | unsigned current_offset, current_length; |
embeddedartists | 0:a771927a62fd | 1449 | const unsigned char *lastptr, *foreptr, *backptr; |
embeddedartists | 0:a771927a62fd | 1450 | unsigned hashpos, prevpos; |
embeddedartists | 0:a771927a62fd | 1451 | |
embeddedartists | 0:a771927a62fd | 1452 | if(windowsize <= 0 || windowsize > 32768) return 60; /*error: windowsize smaller/larger than allowed*/ |
embeddedartists | 0:a771927a62fd | 1453 | if((windowsize & (windowsize - 1)) != 0) return 90; /*error: must be power of two*/ |
embeddedartists | 0:a771927a62fd | 1454 | |
embeddedartists | 0:a771927a62fd | 1455 | if(nicematch > MAX_SUPPORTED_DEFLATE_LENGTH) nicematch = MAX_SUPPORTED_DEFLATE_LENGTH; |
embeddedartists | 0:a771927a62fd | 1456 | |
embeddedartists | 0:a771927a62fd | 1457 | for(pos = inpos; pos < insize; pos++) |
embeddedartists | 0:a771927a62fd | 1458 | { |
embeddedartists | 0:a771927a62fd | 1459 | size_t wpos = pos & (windowsize - 1); /*position for in 'circular' hash buffers*/ |
embeddedartists | 0:a771927a62fd | 1460 | unsigned chainlength = 0; |
embeddedartists | 0:a771927a62fd | 1461 | |
embeddedartists | 0:a771927a62fd | 1462 | hashval = getHash(in, insize, pos); |
embeddedartists | 0:a771927a62fd | 1463 | updateHashChain(hash, wpos, hashval); |
embeddedartists | 0:a771927a62fd | 1464 | |
embeddedartists | 0:a771927a62fd | 1465 | if(usezeros && hashval == 0) |
embeddedartists | 0:a771927a62fd | 1466 | { |
embeddedartists | 0:a771927a62fd | 1467 | if (numzeros == 0) numzeros = countZeros(in, insize, pos); |
embeddedartists | 0:a771927a62fd | 1468 | else if (pos + numzeros >= insize || in[pos + numzeros - 1] != 0) numzeros--; |
embeddedartists | 0:a771927a62fd | 1469 | hash->zeros[wpos] = numzeros; |
embeddedartists | 0:a771927a62fd | 1470 | } |
embeddedartists | 0:a771927a62fd | 1471 | else |
embeddedartists | 0:a771927a62fd | 1472 | { |
embeddedartists | 0:a771927a62fd | 1473 | numzeros = 0; |
embeddedartists | 0:a771927a62fd | 1474 | } |
embeddedartists | 0:a771927a62fd | 1475 | |
embeddedartists | 0:a771927a62fd | 1476 | /*the length and offset found for the current position*/ |
embeddedartists | 0:a771927a62fd | 1477 | length = 0; |
embeddedartists | 0:a771927a62fd | 1478 | offset = 0; |
embeddedartists | 0:a771927a62fd | 1479 | |
embeddedartists | 0:a771927a62fd | 1480 | prevpos = hash->head[hashval]; |
embeddedartists | 0:a771927a62fd | 1481 | hashpos = hash->chain[prevpos]; |
embeddedartists | 0:a771927a62fd | 1482 | |
embeddedartists | 0:a771927a62fd | 1483 | lastptr = &in[insize < pos + MAX_SUPPORTED_DEFLATE_LENGTH ? insize : pos + MAX_SUPPORTED_DEFLATE_LENGTH]; |
embeddedartists | 0:a771927a62fd | 1484 | |
embeddedartists | 0:a771927a62fd | 1485 | /*search for the longest string*/ |
embeddedartists | 0:a771927a62fd | 1486 | for(;;) |
embeddedartists | 0:a771927a62fd | 1487 | { |
embeddedartists | 0:a771927a62fd | 1488 | /*stop when went completely around the circular buffer*/ |
embeddedartists | 0:a771927a62fd | 1489 | if(prevpos < wpos && hashpos > prevpos && hashpos <= wpos) break; |
embeddedartists | 0:a771927a62fd | 1490 | if(prevpos > wpos && (hashpos <= wpos || hashpos > prevpos)) break; |
embeddedartists | 0:a771927a62fd | 1491 | if(chainlength++ >= maxchainlength) break; |
embeddedartists | 0:a771927a62fd | 1492 | |
embeddedartists | 0:a771927a62fd | 1493 | current_offset = hashpos <= wpos ? wpos - hashpos : wpos - hashpos + windowsize; |
embeddedartists | 0:a771927a62fd | 1494 | if(current_offset > 0) |
embeddedartists | 0:a771927a62fd | 1495 | { |
embeddedartists | 0:a771927a62fd | 1496 | /*test the next characters*/ |
embeddedartists | 0:a771927a62fd | 1497 | foreptr = &in[pos]; |
embeddedartists | 0:a771927a62fd | 1498 | backptr = &in[pos - current_offset]; |
embeddedartists | 0:a771927a62fd | 1499 | |
embeddedartists | 0:a771927a62fd | 1500 | /*common case in PNGs is lots of zeros. Quickly skip over them as a speedup*/ |
embeddedartists | 0:a771927a62fd | 1501 | if(usezeros && hashval == 0 && hash->val[hashpos] == 0 /*hashval[hashpos] may be out of date*/) |
embeddedartists | 0:a771927a62fd | 1502 | { |
embeddedartists | 0:a771927a62fd | 1503 | unsigned skip = hash->zeros[hashpos]; |
embeddedartists | 0:a771927a62fd | 1504 | if(skip > numzeros) skip = numzeros; |
embeddedartists | 0:a771927a62fd | 1505 | backptr += skip; |
embeddedartists | 0:a771927a62fd | 1506 | foreptr += skip; |
embeddedartists | 0:a771927a62fd | 1507 | } |
embeddedartists | 0:a771927a62fd | 1508 | |
embeddedartists | 0:a771927a62fd | 1509 | while(foreptr != lastptr && *backptr == *foreptr) /*maximum supported length by deflate is max length*/ |
embeddedartists | 0:a771927a62fd | 1510 | { |
embeddedartists | 0:a771927a62fd | 1511 | ++backptr; |
embeddedartists | 0:a771927a62fd | 1512 | ++foreptr; |
embeddedartists | 0:a771927a62fd | 1513 | } |
embeddedartists | 0:a771927a62fd | 1514 | current_length = (unsigned)(foreptr - &in[pos]); |
embeddedartists | 0:a771927a62fd | 1515 | |
embeddedartists | 0:a771927a62fd | 1516 | if(current_length > length) |
embeddedartists | 0:a771927a62fd | 1517 | { |
embeddedartists | 0:a771927a62fd | 1518 | length = current_length; /*the longest length*/ |
embeddedartists | 0:a771927a62fd | 1519 | offset = current_offset; /*the offset that is related to this longest length*/ |
embeddedartists | 0:a771927a62fd | 1520 | /*jump out once a length of max length is found (speed gain). This also jumps |
embeddedartists | 0:a771927a62fd | 1521 | out if length is MAX_SUPPORTED_DEFLATE_LENGTH*/ |
embeddedartists | 0:a771927a62fd | 1522 | if(current_length >= nicematch) break; |
embeddedartists | 0:a771927a62fd | 1523 | } |
embeddedartists | 0:a771927a62fd | 1524 | } |
embeddedartists | 0:a771927a62fd | 1525 | |
embeddedartists | 0:a771927a62fd | 1526 | if(hashpos == hash->chain[hashpos]) break; |
embeddedartists | 0:a771927a62fd | 1527 | |
embeddedartists | 0:a771927a62fd | 1528 | prevpos = hashpos; |
embeddedartists | 0:a771927a62fd | 1529 | hashpos = hash->chain[hashpos]; |
embeddedartists | 0:a771927a62fd | 1530 | } |
embeddedartists | 0:a771927a62fd | 1531 | |
embeddedartists | 0:a771927a62fd | 1532 | if(lazymatching) |
embeddedartists | 0:a771927a62fd | 1533 | { |
embeddedartists | 0:a771927a62fd | 1534 | if(!lazy && length >= 3 && length <= maxlazymatch && length < MAX_SUPPORTED_DEFLATE_LENGTH) |
embeddedartists | 0:a771927a62fd | 1535 | { |
embeddedartists | 0:a771927a62fd | 1536 | lazy = 1; |
embeddedartists | 0:a771927a62fd | 1537 | lazylength = length; |
embeddedartists | 0:a771927a62fd | 1538 | lazyoffset = offset; |
embeddedartists | 0:a771927a62fd | 1539 | continue; /*try the next byte*/ |
embeddedartists | 0:a771927a62fd | 1540 | } |
embeddedartists | 0:a771927a62fd | 1541 | if(lazy) |
embeddedartists | 0:a771927a62fd | 1542 | { |
embeddedartists | 0:a771927a62fd | 1543 | lazy = 0; |
embeddedartists | 0:a771927a62fd | 1544 | if(pos == 0) ERROR_BREAK(81); |
embeddedartists | 0:a771927a62fd | 1545 | if(length > lazylength + 1) |
embeddedartists | 0:a771927a62fd | 1546 | { |
embeddedartists | 0:a771927a62fd | 1547 | /*push the previous character as literal*/ |
embeddedartists | 0:a771927a62fd | 1548 | if(!uivector_push_back(out, in[pos - 1])) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1549 | } |
embeddedartists | 0:a771927a62fd | 1550 | else |
embeddedartists | 0:a771927a62fd | 1551 | { |
embeddedartists | 0:a771927a62fd | 1552 | length = lazylength; |
embeddedartists | 0:a771927a62fd | 1553 | offset = lazyoffset; |
embeddedartists | 0:a771927a62fd | 1554 | hash->head[hashval] = -1; /*the same hashchain update will be done, this ensures no wrong alteration*/ |
embeddedartists | 0:a771927a62fd | 1555 | pos--; |
embeddedartists | 0:a771927a62fd | 1556 | } |
embeddedartists | 0:a771927a62fd | 1557 | } |
embeddedartists | 0:a771927a62fd | 1558 | } |
embeddedartists | 0:a771927a62fd | 1559 | if(length >= 3 && offset > windowsize) ERROR_BREAK(86 /*too big (or overflown negative) offset*/); |
embeddedartists | 0:a771927a62fd | 1560 | |
embeddedartists | 0:a771927a62fd | 1561 | /*encode it as length/distance pair or literal value*/ |
embeddedartists | 0:a771927a62fd | 1562 | if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ |
embeddedartists | 0:a771927a62fd | 1563 | { |
embeddedartists | 0:a771927a62fd | 1564 | if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1565 | } |
embeddedartists | 0:a771927a62fd | 1566 | else if(length < minmatch || (length == 3 && offset > 4096)) |
embeddedartists | 0:a771927a62fd | 1567 | { |
embeddedartists | 0:a771927a62fd | 1568 | /*compensate for the fact that longer offsets have more extra bits, a |
embeddedartists | 0:a771927a62fd | 1569 | length of only 3 may be not worth it then*/ |
embeddedartists | 0:a771927a62fd | 1570 | if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1571 | } |
embeddedartists | 0:a771927a62fd | 1572 | else |
embeddedartists | 0:a771927a62fd | 1573 | { |
embeddedartists | 0:a771927a62fd | 1574 | addLengthDistance(out, length, offset); |
embeddedartists | 0:a771927a62fd | 1575 | for(i = 1; i < length; i++) |
embeddedartists | 0:a771927a62fd | 1576 | { |
embeddedartists | 0:a771927a62fd | 1577 | pos++; |
embeddedartists | 0:a771927a62fd | 1578 | wpos = pos & (windowsize - 1); |
embeddedartists | 0:a771927a62fd | 1579 | hashval = getHash(in, insize, pos); |
embeddedartists | 0:a771927a62fd | 1580 | updateHashChain(hash, wpos, hashval); |
embeddedartists | 0:a771927a62fd | 1581 | if(usezeros && hashval == 0) |
embeddedartists | 0:a771927a62fd | 1582 | { |
embeddedartists | 0:a771927a62fd | 1583 | if (numzeros == 0) numzeros = countZeros(in, insize, pos); |
embeddedartists | 0:a771927a62fd | 1584 | else if (pos + numzeros >= insize || in[pos + numzeros - 1] != 0) numzeros--; |
embeddedartists | 0:a771927a62fd | 1585 | hash->zeros[wpos] = numzeros; |
embeddedartists | 0:a771927a62fd | 1586 | } |
embeddedartists | 0:a771927a62fd | 1587 | else |
embeddedartists | 0:a771927a62fd | 1588 | { |
embeddedartists | 0:a771927a62fd | 1589 | numzeros = 0; |
embeddedartists | 0:a771927a62fd | 1590 | } |
embeddedartists | 0:a771927a62fd | 1591 | } |
embeddedartists | 0:a771927a62fd | 1592 | } |
embeddedartists | 0:a771927a62fd | 1593 | } /*end of the loop through each character of input*/ |
embeddedartists | 0:a771927a62fd | 1594 | |
embeddedartists | 0:a771927a62fd | 1595 | return error; |
embeddedartists | 0:a771927a62fd | 1596 | } |
embeddedartists | 0:a771927a62fd | 1597 | |
embeddedartists | 0:a771927a62fd | 1598 | /* /////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 1599 | |
embeddedartists | 0:a771927a62fd | 1600 | static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize) |
embeddedartists | 0:a771927a62fd | 1601 | { |
embeddedartists | 0:a771927a62fd | 1602 | /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte, |
embeddedartists | 0:a771927a62fd | 1603 | 2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/ |
embeddedartists | 0:a771927a62fd | 1604 | |
embeddedartists | 0:a771927a62fd | 1605 | size_t i, j, numdeflateblocks = (datasize + 65534) / 65535; |
embeddedartists | 0:a771927a62fd | 1606 | unsigned datapos = 0; |
embeddedartists | 0:a771927a62fd | 1607 | for(i = 0; i < numdeflateblocks; i++) |
embeddedartists | 0:a771927a62fd | 1608 | { |
embeddedartists | 0:a771927a62fd | 1609 | unsigned BFINAL, BTYPE, LEN, NLEN; |
embeddedartists | 0:a771927a62fd | 1610 | unsigned char firstbyte; |
embeddedartists | 0:a771927a62fd | 1611 | |
embeddedartists | 0:a771927a62fd | 1612 | BFINAL = (i == numdeflateblocks - 1); |
embeddedartists | 0:a771927a62fd | 1613 | BTYPE = 0; |
embeddedartists | 0:a771927a62fd | 1614 | |
embeddedartists | 0:a771927a62fd | 1615 | firstbyte = (unsigned char)(BFINAL + ((BTYPE & 1) << 1) + ((BTYPE & 2) << 1)); |
embeddedartists | 0:a771927a62fd | 1616 | ucvector_push_back(out, firstbyte); |
embeddedartists | 0:a771927a62fd | 1617 | |
embeddedartists | 0:a771927a62fd | 1618 | LEN = 65535; |
embeddedartists | 0:a771927a62fd | 1619 | if(datasize - datapos < 65535) LEN = (unsigned)datasize - datapos; |
embeddedartists | 0:a771927a62fd | 1620 | NLEN = 65535 - LEN; |
embeddedartists | 0:a771927a62fd | 1621 | |
embeddedartists | 0:a771927a62fd | 1622 | ucvector_push_back(out, (unsigned char)(LEN % 256)); |
embeddedartists | 0:a771927a62fd | 1623 | ucvector_push_back(out, (unsigned char)(LEN / 256)); |
embeddedartists | 0:a771927a62fd | 1624 | ucvector_push_back(out, (unsigned char)(NLEN % 256)); |
embeddedartists | 0:a771927a62fd | 1625 | ucvector_push_back(out, (unsigned char)(NLEN / 256)); |
embeddedartists | 0:a771927a62fd | 1626 | |
embeddedartists | 0:a771927a62fd | 1627 | /*Decompressed data*/ |
embeddedartists | 0:a771927a62fd | 1628 | for(j = 0; j < 65535 && datapos < datasize; j++) |
embeddedartists | 0:a771927a62fd | 1629 | { |
embeddedartists | 0:a771927a62fd | 1630 | ucvector_push_back(out, data[datapos++]); |
embeddedartists | 0:a771927a62fd | 1631 | } |
embeddedartists | 0:a771927a62fd | 1632 | } |
embeddedartists | 0:a771927a62fd | 1633 | |
embeddedartists | 0:a771927a62fd | 1634 | return 0; |
embeddedartists | 0:a771927a62fd | 1635 | } |
embeddedartists | 0:a771927a62fd | 1636 | |
embeddedartists | 0:a771927a62fd | 1637 | /* |
embeddedartists | 0:a771927a62fd | 1638 | write the lz77-encoded data, which has lit, len and dist codes, to compressed stream using huffman trees. |
embeddedartists | 0:a771927a62fd | 1639 | tree_ll: the tree for lit and len codes. |
embeddedartists | 0:a771927a62fd | 1640 | tree_d: the tree for distance codes. |
embeddedartists | 0:a771927a62fd | 1641 | */ |
embeddedartists | 0:a771927a62fd | 1642 | static void writeLZ77data(size_t* bp, ucvector* out, const uivector* lz77_encoded, |
embeddedartists | 0:a771927a62fd | 1643 | const HuffmanTree* tree_ll, const HuffmanTree* tree_d) |
embeddedartists | 0:a771927a62fd | 1644 | { |
embeddedartists | 0:a771927a62fd | 1645 | size_t i = 0; |
embeddedartists | 0:a771927a62fd | 1646 | for(i = 0; i < lz77_encoded->size; i++) |
embeddedartists | 0:a771927a62fd | 1647 | { |
embeddedartists | 0:a771927a62fd | 1648 | unsigned val = lz77_encoded->data[i]; |
embeddedartists | 0:a771927a62fd | 1649 | addHuffmanSymbol(bp, out, HuffmanTree_getCode(tree_ll, val), HuffmanTree_getLength(tree_ll, val)); |
embeddedartists | 0:a771927a62fd | 1650 | if(val > 256) /*for a length code, 3 more things have to be added*/ |
embeddedartists | 0:a771927a62fd | 1651 | { |
embeddedartists | 0:a771927a62fd | 1652 | unsigned length_index = val - FIRST_LENGTH_CODE_INDEX; |
embeddedartists | 0:a771927a62fd | 1653 | unsigned n_length_extra_bits = LENGTHEXTRA[length_index]; |
embeddedartists | 0:a771927a62fd | 1654 | unsigned length_extra_bits = lz77_encoded->data[++i]; |
embeddedartists | 0:a771927a62fd | 1655 | |
embeddedartists | 0:a771927a62fd | 1656 | unsigned distance_code = lz77_encoded->data[++i]; |
embeddedartists | 0:a771927a62fd | 1657 | |
embeddedartists | 0:a771927a62fd | 1658 | unsigned distance_index = distance_code; |
embeddedartists | 0:a771927a62fd | 1659 | unsigned n_distance_extra_bits = DISTANCEEXTRA[distance_index]; |
embeddedartists | 0:a771927a62fd | 1660 | unsigned distance_extra_bits = lz77_encoded->data[++i]; |
embeddedartists | 0:a771927a62fd | 1661 | |
embeddedartists | 0:a771927a62fd | 1662 | addBitsToStream(bp, out, length_extra_bits, n_length_extra_bits); |
embeddedartists | 0:a771927a62fd | 1663 | addHuffmanSymbol(bp, out, HuffmanTree_getCode(tree_d, distance_code), |
embeddedartists | 0:a771927a62fd | 1664 | HuffmanTree_getLength(tree_d, distance_code)); |
embeddedartists | 0:a771927a62fd | 1665 | addBitsToStream(bp, out, distance_extra_bits, n_distance_extra_bits); |
embeddedartists | 0:a771927a62fd | 1666 | } |
embeddedartists | 0:a771927a62fd | 1667 | } |
embeddedartists | 0:a771927a62fd | 1668 | } |
embeddedartists | 0:a771927a62fd | 1669 | |
embeddedartists | 0:a771927a62fd | 1670 | /*Deflate for a block of type "dynamic", that is, with freely, optimally, created huffman trees*/ |
embeddedartists | 0:a771927a62fd | 1671 | static unsigned deflateDynamic(ucvector* out, size_t* bp, Hash* hash, |
embeddedartists | 0:a771927a62fd | 1672 | const unsigned char* data, size_t datapos, size_t dataend, |
embeddedartists | 0:a771927a62fd | 1673 | const LodePNGCompressSettings* settings, int final) |
embeddedartists | 0:a771927a62fd | 1674 | { |
embeddedartists | 0:a771927a62fd | 1675 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 1676 | |
embeddedartists | 0:a771927a62fd | 1677 | /* |
embeddedartists | 0:a771927a62fd | 1678 | A block is compressed as follows: The PNG data is lz77 encoded, resulting in |
embeddedartists | 0:a771927a62fd | 1679 | literal bytes and length/distance pairs. This is then huffman compressed with |
embeddedartists | 0:a771927a62fd | 1680 | two huffman trees. One huffman tree is used for the lit and len values ("ll"), |
embeddedartists | 0:a771927a62fd | 1681 | another huffman tree is used for the dist values ("d"). These two trees are |
embeddedartists | 0:a771927a62fd | 1682 | stored using their code lengths, and to compress even more these code lengths |
embeddedartists | 0:a771927a62fd | 1683 | are also run-length encoded and huffman compressed. This gives a huffman tree |
embeddedartists | 0:a771927a62fd | 1684 | of code lengths "cl". The code lenghts used to describe this third tree are |
embeddedartists | 0:a771927a62fd | 1685 | the code length code lengths ("clcl"). |
embeddedartists | 0:a771927a62fd | 1686 | */ |
embeddedartists | 0:a771927a62fd | 1687 | |
embeddedartists | 0:a771927a62fd | 1688 | /*The lz77 encoded data, represented with integers since there will also be length and distance codes in it*/ |
embeddedartists | 0:a771927a62fd | 1689 | uivector lz77_encoded; |
embeddedartists | 0:a771927a62fd | 1690 | HuffmanTree tree_ll; /*tree for lit,len values*/ |
embeddedartists | 0:a771927a62fd | 1691 | HuffmanTree tree_d; /*tree for distance codes*/ |
embeddedartists | 0:a771927a62fd | 1692 | HuffmanTree tree_cl; /*tree for encoding the code lengths representing tree_ll and tree_d*/ |
embeddedartists | 0:a771927a62fd | 1693 | uivector frequencies_ll; /*frequency of lit,len codes*/ |
embeddedartists | 0:a771927a62fd | 1694 | uivector frequencies_d; /*frequency of dist codes*/ |
embeddedartists | 0:a771927a62fd | 1695 | uivector frequencies_cl; /*frequency of code length codes*/ |
embeddedartists | 0:a771927a62fd | 1696 | uivector bitlen_lld; /*lit,len,dist code lenghts (int bits), literally (without repeat codes).*/ |
embeddedartists | 0:a771927a62fd | 1697 | uivector bitlen_lld_e; /*bitlen_lld encoded with repeat codes (this is a rudemtary run length compression)*/ |
embeddedartists | 0:a771927a62fd | 1698 | /*bitlen_cl is the code length code lengths ("clcl"). The bit lengths of codes to represent tree_cl |
embeddedartists | 0:a771927a62fd | 1699 | (these are written as is in the file, it would be crazy to compress these using yet another huffman |
embeddedartists | 0:a771927a62fd | 1700 | tree that needs to be represented by yet another set of code lengths)*/ |
embeddedartists | 0:a771927a62fd | 1701 | uivector bitlen_cl; |
embeddedartists | 0:a771927a62fd | 1702 | size_t datasize = dataend - datapos; |
embeddedartists | 0:a771927a62fd | 1703 | |
embeddedartists | 0:a771927a62fd | 1704 | /* |
embeddedartists | 0:a771927a62fd | 1705 | Due to the huffman compression of huffman tree representations ("two levels"), there are some anologies: |
embeddedartists | 0:a771927a62fd | 1706 | bitlen_lld is to tree_cl what data is to tree_ll and tree_d. |
embeddedartists | 0:a771927a62fd | 1707 | bitlen_lld_e is to bitlen_lld what lz77_encoded is to data. |
embeddedartists | 0:a771927a62fd | 1708 | bitlen_cl is to bitlen_lld_e what bitlen_lld is to lz77_encoded. |
embeddedartists | 0:a771927a62fd | 1709 | */ |
embeddedartists | 0:a771927a62fd | 1710 | |
embeddedartists | 0:a771927a62fd | 1711 | unsigned BFINAL = final; |
embeddedartists | 0:a771927a62fd | 1712 | size_t numcodes_ll, numcodes_d, i; |
embeddedartists | 0:a771927a62fd | 1713 | unsigned HLIT, HDIST, HCLEN; |
embeddedartists | 0:a771927a62fd | 1714 | |
embeddedartists | 0:a771927a62fd | 1715 | uivector_init(&lz77_encoded); |
embeddedartists | 0:a771927a62fd | 1716 | HuffmanTree_init(&tree_ll); |
embeddedartists | 0:a771927a62fd | 1717 | HuffmanTree_init(&tree_d); |
embeddedartists | 0:a771927a62fd | 1718 | HuffmanTree_init(&tree_cl); |
embeddedartists | 0:a771927a62fd | 1719 | uivector_init(&frequencies_ll); |
embeddedartists | 0:a771927a62fd | 1720 | uivector_init(&frequencies_d); |
embeddedartists | 0:a771927a62fd | 1721 | uivector_init(&frequencies_cl); |
embeddedartists | 0:a771927a62fd | 1722 | uivector_init(&bitlen_lld); |
embeddedartists | 0:a771927a62fd | 1723 | uivector_init(&bitlen_lld_e); |
embeddedartists | 0:a771927a62fd | 1724 | uivector_init(&bitlen_cl); |
embeddedartists | 0:a771927a62fd | 1725 | |
embeddedartists | 0:a771927a62fd | 1726 | /*This while loop never loops due to a break at the end, it is here to |
embeddedartists | 0:a771927a62fd | 1727 | allow breaking out of it to the cleanup phase on error conditions.*/ |
embeddedartists | 0:a771927a62fd | 1728 | while(!error) |
embeddedartists | 0:a771927a62fd | 1729 | { |
embeddedartists | 0:a771927a62fd | 1730 | if(settings->use_lz77) |
embeddedartists | 0:a771927a62fd | 1731 | { |
embeddedartists | 0:a771927a62fd | 1732 | error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize, |
embeddedartists | 0:a771927a62fd | 1733 | settings->minmatch, settings->nicematch, settings->lazymatching); |
embeddedartists | 0:a771927a62fd | 1734 | if(error) break; |
embeddedartists | 0:a771927a62fd | 1735 | } |
embeddedartists | 0:a771927a62fd | 1736 | else |
embeddedartists | 0:a771927a62fd | 1737 | { |
embeddedartists | 0:a771927a62fd | 1738 | if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1739 | for(i = datapos; i < dataend; i++) lz77_encoded.data[i] = data[i]; /*no LZ77, but still will be Huffman compressed*/ |
embeddedartists | 0:a771927a62fd | 1740 | } |
embeddedartists | 0:a771927a62fd | 1741 | |
embeddedartists | 0:a771927a62fd | 1742 | if(!uivector_resizev(&frequencies_ll, 286, 0)) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1743 | if(!uivector_resizev(&frequencies_d, 30, 0)) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1744 | |
embeddedartists | 0:a771927a62fd | 1745 | /*Count the frequencies of lit, len and dist codes*/ |
embeddedartists | 0:a771927a62fd | 1746 | for(i = 0; i < lz77_encoded.size; i++) |
embeddedartists | 0:a771927a62fd | 1747 | { |
embeddedartists | 0:a771927a62fd | 1748 | unsigned symbol = lz77_encoded.data[i]; |
embeddedartists | 0:a771927a62fd | 1749 | frequencies_ll.data[symbol]++; |
embeddedartists | 0:a771927a62fd | 1750 | if(symbol > 256) |
embeddedartists | 0:a771927a62fd | 1751 | { |
embeddedartists | 0:a771927a62fd | 1752 | unsigned dist = lz77_encoded.data[i + 2]; |
embeddedartists | 0:a771927a62fd | 1753 | frequencies_d.data[dist]++; |
embeddedartists | 0:a771927a62fd | 1754 | i += 3; |
embeddedartists | 0:a771927a62fd | 1755 | } |
embeddedartists | 0:a771927a62fd | 1756 | } |
embeddedartists | 0:a771927a62fd | 1757 | frequencies_ll.data[256] = 1; /*there will be exactly 1 end code, at the end of the block*/ |
embeddedartists | 0:a771927a62fd | 1758 | |
embeddedartists | 0:a771927a62fd | 1759 | /*Make both huffman trees, one for the lit and len codes, one for the dist codes*/ |
embeddedartists | 0:a771927a62fd | 1760 | error = HuffmanTree_makeFromFrequencies(&tree_ll, frequencies_ll.data, 257, frequencies_ll.size, 15); |
embeddedartists | 0:a771927a62fd | 1761 | if(error) break; |
embeddedartists | 0:a771927a62fd | 1762 | /*2, not 1, is chosen for mincodes: some buggy PNG decoders require at least 2 symbols in the dist tree*/ |
embeddedartists | 0:a771927a62fd | 1763 | error = HuffmanTree_makeFromFrequencies(&tree_d, frequencies_d.data, 2, frequencies_d.size, 15); |
embeddedartists | 0:a771927a62fd | 1764 | if(error) break; |
embeddedartists | 0:a771927a62fd | 1765 | |
embeddedartists | 0:a771927a62fd | 1766 | numcodes_ll = tree_ll.numcodes; if(numcodes_ll > 286) numcodes_ll = 286; |
embeddedartists | 0:a771927a62fd | 1767 | numcodes_d = tree_d.numcodes; if(numcodes_d > 30) numcodes_d = 30; |
embeddedartists | 0:a771927a62fd | 1768 | /*store the code lengths of both generated trees in bitlen_lld*/ |
embeddedartists | 0:a771927a62fd | 1769 | for(i = 0; i < numcodes_ll; i++) uivector_push_back(&bitlen_lld, HuffmanTree_getLength(&tree_ll, (unsigned)i)); |
embeddedartists | 0:a771927a62fd | 1770 | for(i = 0; i < numcodes_d; i++) uivector_push_back(&bitlen_lld, HuffmanTree_getLength(&tree_d, (unsigned)i)); |
embeddedartists | 0:a771927a62fd | 1771 | |
embeddedartists | 0:a771927a62fd | 1772 | /*run-length compress bitlen_ldd into bitlen_lld_e by using repeat codes 16 (copy length 3-6 times), |
embeddedartists | 0:a771927a62fd | 1773 | 17 (3-10 zeroes), 18 (11-138 zeroes)*/ |
embeddedartists | 0:a771927a62fd | 1774 | for(i = 0; i < (unsigned)bitlen_lld.size; i++) |
embeddedartists | 0:a771927a62fd | 1775 | { |
embeddedartists | 0:a771927a62fd | 1776 | unsigned j = 0; /*amount of repititions*/ |
embeddedartists | 0:a771927a62fd | 1777 | while(i + j + 1 < (unsigned)bitlen_lld.size && bitlen_lld.data[i + j + 1] == bitlen_lld.data[i]) j++; |
embeddedartists | 0:a771927a62fd | 1778 | |
embeddedartists | 0:a771927a62fd | 1779 | if(bitlen_lld.data[i] == 0 && j >= 2) /*repeat code for zeroes*/ |
embeddedartists | 0:a771927a62fd | 1780 | { |
embeddedartists | 0:a771927a62fd | 1781 | j++; /*include the first zero*/ |
embeddedartists | 0:a771927a62fd | 1782 | if(j <= 10) /*repeat code 17 supports max 10 zeroes*/ |
embeddedartists | 0:a771927a62fd | 1783 | { |
embeddedartists | 0:a771927a62fd | 1784 | uivector_push_back(&bitlen_lld_e, 17); |
embeddedartists | 0:a771927a62fd | 1785 | uivector_push_back(&bitlen_lld_e, j - 3); |
embeddedartists | 0:a771927a62fd | 1786 | } |
embeddedartists | 0:a771927a62fd | 1787 | else /*repeat code 18 supports max 138 zeroes*/ |
embeddedartists | 0:a771927a62fd | 1788 | { |
embeddedartists | 0:a771927a62fd | 1789 | if(j > 138) j = 138; |
embeddedartists | 0:a771927a62fd | 1790 | uivector_push_back(&bitlen_lld_e, 18); |
embeddedartists | 0:a771927a62fd | 1791 | uivector_push_back(&bitlen_lld_e, j - 11); |
embeddedartists | 0:a771927a62fd | 1792 | } |
embeddedartists | 0:a771927a62fd | 1793 | i += (j - 1); |
embeddedartists | 0:a771927a62fd | 1794 | } |
embeddedartists | 0:a771927a62fd | 1795 | else if(j >= 3) /*repeat code for value other than zero*/ |
embeddedartists | 0:a771927a62fd | 1796 | { |
embeddedartists | 0:a771927a62fd | 1797 | size_t k; |
embeddedartists | 0:a771927a62fd | 1798 | unsigned num = j / 6, rest = j % 6; |
embeddedartists | 0:a771927a62fd | 1799 | uivector_push_back(&bitlen_lld_e, bitlen_lld.data[i]); |
embeddedartists | 0:a771927a62fd | 1800 | for(k = 0; k < num; k++) |
embeddedartists | 0:a771927a62fd | 1801 | { |
embeddedartists | 0:a771927a62fd | 1802 | uivector_push_back(&bitlen_lld_e, 16); |
embeddedartists | 0:a771927a62fd | 1803 | uivector_push_back(&bitlen_lld_e, 6 - 3); |
embeddedartists | 0:a771927a62fd | 1804 | } |
embeddedartists | 0:a771927a62fd | 1805 | if(rest >= 3) |
embeddedartists | 0:a771927a62fd | 1806 | { |
embeddedartists | 0:a771927a62fd | 1807 | uivector_push_back(&bitlen_lld_e, 16); |
embeddedartists | 0:a771927a62fd | 1808 | uivector_push_back(&bitlen_lld_e, rest - 3); |
embeddedartists | 0:a771927a62fd | 1809 | } |
embeddedartists | 0:a771927a62fd | 1810 | else j -= rest; |
embeddedartists | 0:a771927a62fd | 1811 | i += j; |
embeddedartists | 0:a771927a62fd | 1812 | } |
embeddedartists | 0:a771927a62fd | 1813 | else /*too short to benefit from repeat code*/ |
embeddedartists | 0:a771927a62fd | 1814 | { |
embeddedartists | 0:a771927a62fd | 1815 | uivector_push_back(&bitlen_lld_e, bitlen_lld.data[i]); |
embeddedartists | 0:a771927a62fd | 1816 | } |
embeddedartists | 0:a771927a62fd | 1817 | } |
embeddedartists | 0:a771927a62fd | 1818 | |
embeddedartists | 0:a771927a62fd | 1819 | /*generate tree_cl, the huffmantree of huffmantrees*/ |
embeddedartists | 0:a771927a62fd | 1820 | |
embeddedartists | 0:a771927a62fd | 1821 | if(!uivector_resizev(&frequencies_cl, NUM_CODE_LENGTH_CODES, 0)) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1822 | for(i = 0; i < bitlen_lld_e.size; i++) |
embeddedartists | 0:a771927a62fd | 1823 | { |
embeddedartists | 0:a771927a62fd | 1824 | frequencies_cl.data[bitlen_lld_e.data[i]]++; |
embeddedartists | 0:a771927a62fd | 1825 | /*after a repeat code come the bits that specify the number of repetitions, |
embeddedartists | 0:a771927a62fd | 1826 | those don't need to be in the frequencies_cl calculation*/ |
embeddedartists | 0:a771927a62fd | 1827 | if(bitlen_lld_e.data[i] >= 16) i++; |
embeddedartists | 0:a771927a62fd | 1828 | } |
embeddedartists | 0:a771927a62fd | 1829 | |
embeddedartists | 0:a771927a62fd | 1830 | error = HuffmanTree_makeFromFrequencies(&tree_cl, frequencies_cl.data, |
embeddedartists | 0:a771927a62fd | 1831 | frequencies_cl.size, frequencies_cl.size, 7); |
embeddedartists | 0:a771927a62fd | 1832 | if(error) break; |
embeddedartists | 0:a771927a62fd | 1833 | |
embeddedartists | 0:a771927a62fd | 1834 | if(!uivector_resize(&bitlen_cl, tree_cl.numcodes)) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1835 | for(i = 0; i < tree_cl.numcodes; i++) |
embeddedartists | 0:a771927a62fd | 1836 | { |
embeddedartists | 0:a771927a62fd | 1837 | /*lenghts of code length tree is in the order as specified by deflate*/ |
embeddedartists | 0:a771927a62fd | 1838 | bitlen_cl.data[i] = HuffmanTree_getLength(&tree_cl, CLCL_ORDER[i]); |
embeddedartists | 0:a771927a62fd | 1839 | } |
embeddedartists | 0:a771927a62fd | 1840 | while(bitlen_cl.data[bitlen_cl.size - 1] == 0 && bitlen_cl.size > 4) |
embeddedartists | 0:a771927a62fd | 1841 | { |
embeddedartists | 0:a771927a62fd | 1842 | /*remove zeros at the end, but minimum size must be 4*/ |
embeddedartists | 0:a771927a62fd | 1843 | if(!uivector_resize(&bitlen_cl, bitlen_cl.size - 1)) ERROR_BREAK(83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 1844 | } |
embeddedartists | 0:a771927a62fd | 1845 | if(error) break; |
embeddedartists | 0:a771927a62fd | 1846 | |
embeddedartists | 0:a771927a62fd | 1847 | /* |
embeddedartists | 0:a771927a62fd | 1848 | Write everything into the output |
embeddedartists | 0:a771927a62fd | 1849 | |
embeddedartists | 0:a771927a62fd | 1850 | After the BFINAL and BTYPE, the dynamic block consists out of the following: |
embeddedartists | 0:a771927a62fd | 1851 | - 5 bits HLIT, 5 bits HDIST, 4 bits HCLEN |
embeddedartists | 0:a771927a62fd | 1852 | - (HCLEN+4)*3 bits code lengths of code length alphabet |
embeddedartists | 0:a771927a62fd | 1853 | - HLIT + 257 code lenghts of lit/length alphabet (encoded using the code length |
embeddedartists | 0:a771927a62fd | 1854 | alphabet, + possible repetition codes 16, 17, 18) |
embeddedartists | 0:a771927a62fd | 1855 | - HDIST + 1 code lengths of distance alphabet (encoded using the code length |
embeddedartists | 0:a771927a62fd | 1856 | alphabet, + possible repetition codes 16, 17, 18) |
embeddedartists | 0:a771927a62fd | 1857 | - compressed data |
embeddedartists | 0:a771927a62fd | 1858 | - 256 (end code) |
embeddedartists | 0:a771927a62fd | 1859 | */ |
embeddedartists | 0:a771927a62fd | 1860 | |
embeddedartists | 0:a771927a62fd | 1861 | /*Write block type*/ |
embeddedartists | 0:a771927a62fd | 1862 | addBitToStream(bp, out, BFINAL); |
embeddedartists | 0:a771927a62fd | 1863 | addBitToStream(bp, out, 0); /*first bit of BTYPE "dynamic"*/ |
embeddedartists | 0:a771927a62fd | 1864 | addBitToStream(bp, out, 1); /*second bit of BTYPE "dynamic"*/ |
embeddedartists | 0:a771927a62fd | 1865 | |
embeddedartists | 0:a771927a62fd | 1866 | /*write the HLIT, HDIST and HCLEN values*/ |
embeddedartists | 0:a771927a62fd | 1867 | HLIT = (unsigned)(numcodes_ll - 257); |
embeddedartists | 0:a771927a62fd | 1868 | HDIST = (unsigned)(numcodes_d - 1); |
embeddedartists | 0:a771927a62fd | 1869 | HCLEN = (unsigned)bitlen_cl.size - 4; |
embeddedartists | 0:a771927a62fd | 1870 | /*trim zeroes for HCLEN. HLIT and HDIST were already trimmed at tree creation*/ |
embeddedartists | 0:a771927a62fd | 1871 | while(!bitlen_cl.data[HCLEN + 4 - 1] && HCLEN > 0) HCLEN--; |
embeddedartists | 0:a771927a62fd | 1872 | addBitsToStream(bp, out, HLIT, 5); |
embeddedartists | 0:a771927a62fd | 1873 | addBitsToStream(bp, out, HDIST, 5); |
embeddedartists | 0:a771927a62fd | 1874 | addBitsToStream(bp, out, HCLEN, 4); |
embeddedartists | 0:a771927a62fd | 1875 | |
embeddedartists | 0:a771927a62fd | 1876 | /*write the code lenghts of the code length alphabet*/ |
embeddedartists | 0:a771927a62fd | 1877 | for(i = 0; i < HCLEN + 4; i++) addBitsToStream(bp, out, bitlen_cl.data[i], 3); |
embeddedartists | 0:a771927a62fd | 1878 | |
embeddedartists | 0:a771927a62fd | 1879 | /*write the lenghts of the lit/len AND the dist alphabet*/ |
embeddedartists | 0:a771927a62fd | 1880 | for(i = 0; i < bitlen_lld_e.size; i++) |
embeddedartists | 0:a771927a62fd | 1881 | { |
embeddedartists | 0:a771927a62fd | 1882 | addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_cl, bitlen_lld_e.data[i]), |
embeddedartists | 0:a771927a62fd | 1883 | HuffmanTree_getLength(&tree_cl, bitlen_lld_e.data[i])); |
embeddedartists | 0:a771927a62fd | 1884 | /*extra bits of repeat codes*/ |
embeddedartists | 0:a771927a62fd | 1885 | if(bitlen_lld_e.data[i] == 16) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 2); |
embeddedartists | 0:a771927a62fd | 1886 | else if(bitlen_lld_e.data[i] == 17) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 3); |
embeddedartists | 0:a771927a62fd | 1887 | else if(bitlen_lld_e.data[i] == 18) addBitsToStream(bp, out, bitlen_lld_e.data[++i], 7); |
embeddedartists | 0:a771927a62fd | 1888 | } |
embeddedartists | 0:a771927a62fd | 1889 | |
embeddedartists | 0:a771927a62fd | 1890 | /*write the compressed data symbols*/ |
embeddedartists | 0:a771927a62fd | 1891 | writeLZ77data(bp, out, &lz77_encoded, &tree_ll, &tree_d); |
embeddedartists | 0:a771927a62fd | 1892 | /*error: the length of the end code 256 must be larger than 0*/ |
embeddedartists | 0:a771927a62fd | 1893 | if(HuffmanTree_getLength(&tree_ll, 256) == 0) ERROR_BREAK(64); |
embeddedartists | 0:a771927a62fd | 1894 | |
embeddedartists | 0:a771927a62fd | 1895 | /*write the end code*/ |
embeddedartists | 0:a771927a62fd | 1896 | addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256)); |
embeddedartists | 0:a771927a62fd | 1897 | |
embeddedartists | 0:a771927a62fd | 1898 | break; /*end of error-while*/ |
embeddedartists | 0:a771927a62fd | 1899 | } |
embeddedartists | 0:a771927a62fd | 1900 | |
embeddedartists | 0:a771927a62fd | 1901 | /*cleanup*/ |
embeddedartists | 0:a771927a62fd | 1902 | uivector_cleanup(&lz77_encoded); |
embeddedartists | 0:a771927a62fd | 1903 | HuffmanTree_cleanup(&tree_ll); |
embeddedartists | 0:a771927a62fd | 1904 | HuffmanTree_cleanup(&tree_d); |
embeddedartists | 0:a771927a62fd | 1905 | HuffmanTree_cleanup(&tree_cl); |
embeddedartists | 0:a771927a62fd | 1906 | uivector_cleanup(&frequencies_ll); |
embeddedartists | 0:a771927a62fd | 1907 | uivector_cleanup(&frequencies_d); |
embeddedartists | 0:a771927a62fd | 1908 | uivector_cleanup(&frequencies_cl); |
embeddedartists | 0:a771927a62fd | 1909 | uivector_cleanup(&bitlen_lld_e); |
embeddedartists | 0:a771927a62fd | 1910 | uivector_cleanup(&bitlen_lld); |
embeddedartists | 0:a771927a62fd | 1911 | uivector_cleanup(&bitlen_cl); |
embeddedartists | 0:a771927a62fd | 1912 | |
embeddedartists | 0:a771927a62fd | 1913 | return error; |
embeddedartists | 0:a771927a62fd | 1914 | } |
embeddedartists | 0:a771927a62fd | 1915 | |
embeddedartists | 0:a771927a62fd | 1916 | static unsigned deflateFixed(ucvector* out, size_t* bp, Hash* hash, |
embeddedartists | 0:a771927a62fd | 1917 | const unsigned char* data, |
embeddedartists | 0:a771927a62fd | 1918 | size_t datapos, size_t dataend, |
embeddedartists | 0:a771927a62fd | 1919 | const LodePNGCompressSettings* settings, int final) |
embeddedartists | 0:a771927a62fd | 1920 | { |
embeddedartists | 0:a771927a62fd | 1921 | HuffmanTree tree_ll; /*tree for literal values and length codes*/ |
embeddedartists | 0:a771927a62fd | 1922 | HuffmanTree tree_d; /*tree for distance codes*/ |
embeddedartists | 0:a771927a62fd | 1923 | |
embeddedartists | 0:a771927a62fd | 1924 | unsigned BFINAL = final; |
embeddedartists | 0:a771927a62fd | 1925 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 1926 | size_t i; |
embeddedartists | 0:a771927a62fd | 1927 | |
embeddedartists | 0:a771927a62fd | 1928 | HuffmanTree_init(&tree_ll); |
embeddedartists | 0:a771927a62fd | 1929 | HuffmanTree_init(&tree_d); |
embeddedartists | 0:a771927a62fd | 1930 | |
embeddedartists | 0:a771927a62fd | 1931 | generateFixedLitLenTree(&tree_ll); |
embeddedartists | 0:a771927a62fd | 1932 | generateFixedDistanceTree(&tree_d); |
embeddedartists | 0:a771927a62fd | 1933 | |
embeddedartists | 0:a771927a62fd | 1934 | addBitToStream(bp, out, BFINAL); |
embeddedartists | 0:a771927a62fd | 1935 | addBitToStream(bp, out, 1); /*first bit of BTYPE*/ |
embeddedartists | 0:a771927a62fd | 1936 | addBitToStream(bp, out, 0); /*second bit of BTYPE*/ |
embeddedartists | 0:a771927a62fd | 1937 | |
embeddedartists | 0:a771927a62fd | 1938 | if(settings->use_lz77) /*LZ77 encoded*/ |
embeddedartists | 0:a771927a62fd | 1939 | { |
embeddedartists | 0:a771927a62fd | 1940 | uivector lz77_encoded; |
embeddedartists | 0:a771927a62fd | 1941 | uivector_init(&lz77_encoded); |
embeddedartists | 0:a771927a62fd | 1942 | error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize, |
embeddedartists | 0:a771927a62fd | 1943 | settings->minmatch, settings->nicematch, settings->lazymatching); |
embeddedartists | 0:a771927a62fd | 1944 | if(!error) writeLZ77data(bp, out, &lz77_encoded, &tree_ll, &tree_d); |
embeddedartists | 0:a771927a62fd | 1945 | uivector_cleanup(&lz77_encoded); |
embeddedartists | 0:a771927a62fd | 1946 | } |
embeddedartists | 0:a771927a62fd | 1947 | else /*no LZ77, but still will be Huffman compressed*/ |
embeddedartists | 0:a771927a62fd | 1948 | { |
embeddedartists | 0:a771927a62fd | 1949 | for(i = datapos; i < dataend; i++) |
embeddedartists | 0:a771927a62fd | 1950 | { |
embeddedartists | 0:a771927a62fd | 1951 | addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, data[i]), HuffmanTree_getLength(&tree_ll, data[i])); |
embeddedartists | 0:a771927a62fd | 1952 | } |
embeddedartists | 0:a771927a62fd | 1953 | } |
embeddedartists | 0:a771927a62fd | 1954 | /*add END code*/ |
embeddedartists | 0:a771927a62fd | 1955 | if(!error) addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256)); |
embeddedartists | 0:a771927a62fd | 1956 | |
embeddedartists | 0:a771927a62fd | 1957 | /*cleanup*/ |
embeddedartists | 0:a771927a62fd | 1958 | HuffmanTree_cleanup(&tree_ll); |
embeddedartists | 0:a771927a62fd | 1959 | HuffmanTree_cleanup(&tree_d); |
embeddedartists | 0:a771927a62fd | 1960 | |
embeddedartists | 0:a771927a62fd | 1961 | return error; |
embeddedartists | 0:a771927a62fd | 1962 | } |
embeddedartists | 0:a771927a62fd | 1963 | |
embeddedartists | 0:a771927a62fd | 1964 | static unsigned lodepng_deflatev(ucvector* out, const unsigned char* in, size_t insize, |
embeddedartists | 0:a771927a62fd | 1965 | const LodePNGCompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 1966 | { |
embeddedartists | 0:a771927a62fd | 1967 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 1968 | size_t i, blocksize, numdeflateblocks; |
embeddedartists | 0:a771927a62fd | 1969 | size_t bp = 0; /*the bit pointer*/ |
embeddedartists | 0:a771927a62fd | 1970 | Hash hash; |
embeddedartists | 0:a771927a62fd | 1971 | |
embeddedartists | 0:a771927a62fd | 1972 | if(settings->btype > 2) return 61; |
embeddedartists | 0:a771927a62fd | 1973 | else if(settings->btype == 0) return deflateNoCompression(out, in, insize); |
embeddedartists | 0:a771927a62fd | 1974 | else if(settings->btype == 1) blocksize = insize; |
embeddedartists | 0:a771927a62fd | 1975 | else /*if(settings->btype == 2)*/ |
embeddedartists | 0:a771927a62fd | 1976 | { |
embeddedartists | 0:a771927a62fd | 1977 | blocksize = insize / 8 + 8; |
embeddedartists | 0:a771927a62fd | 1978 | if(blocksize < 65535) blocksize = 65535; |
embeddedartists | 0:a771927a62fd | 1979 | } |
embeddedartists | 0:a771927a62fd | 1980 | |
embeddedartists | 0:a771927a62fd | 1981 | numdeflateblocks = (insize + blocksize - 1) / blocksize; |
embeddedartists | 0:a771927a62fd | 1982 | if(numdeflateblocks == 0) numdeflateblocks = 1; |
embeddedartists | 0:a771927a62fd | 1983 | |
embeddedartists | 0:a771927a62fd | 1984 | error = hash_init(&hash, settings->windowsize); |
embeddedartists | 0:a771927a62fd | 1985 | if(error) return error; |
embeddedartists | 0:a771927a62fd | 1986 | |
embeddedartists | 0:a771927a62fd | 1987 | for(i = 0; i < numdeflateblocks && !error; i++) |
embeddedartists | 0:a771927a62fd | 1988 | { |
embeddedartists | 0:a771927a62fd | 1989 | int final = i == numdeflateblocks - 1; |
embeddedartists | 0:a771927a62fd | 1990 | size_t start = i * blocksize; |
embeddedartists | 0:a771927a62fd | 1991 | size_t end = start + blocksize; |
embeddedartists | 0:a771927a62fd | 1992 | if(end > insize) end = insize; |
embeddedartists | 0:a771927a62fd | 1993 | |
embeddedartists | 0:a771927a62fd | 1994 | if(settings->btype == 1) error = deflateFixed(out, &bp, &hash, in, start, end, settings, final); |
embeddedartists | 0:a771927a62fd | 1995 | else if(settings->btype == 2) error = deflateDynamic(out, &bp, &hash, in, start, end, settings, final); |
embeddedartists | 0:a771927a62fd | 1996 | } |
embeddedartists | 0:a771927a62fd | 1997 | |
embeddedartists | 0:a771927a62fd | 1998 | hash_cleanup(&hash); |
embeddedartists | 0:a771927a62fd | 1999 | |
embeddedartists | 0:a771927a62fd | 2000 | return error; |
embeddedartists | 0:a771927a62fd | 2001 | } |
embeddedartists | 0:a771927a62fd | 2002 | |
embeddedartists | 0:a771927a62fd | 2003 | unsigned lodepng_deflate(unsigned char** out, size_t* outsize, |
embeddedartists | 0:a771927a62fd | 2004 | const unsigned char* in, size_t insize, |
embeddedartists | 0:a771927a62fd | 2005 | const LodePNGCompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2006 | { |
embeddedartists | 0:a771927a62fd | 2007 | unsigned error; |
embeddedartists | 0:a771927a62fd | 2008 | ucvector v; |
embeddedartists | 0:a771927a62fd | 2009 | ucvector_init_buffer(&v, *out, *outsize); |
embeddedartists | 0:a771927a62fd | 2010 | error = lodepng_deflatev(&v, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2011 | *out = v.data; |
embeddedartists | 0:a771927a62fd | 2012 | *outsize = v.size; |
embeddedartists | 0:a771927a62fd | 2013 | return error; |
embeddedartists | 0:a771927a62fd | 2014 | } |
embeddedartists | 0:a771927a62fd | 2015 | |
embeddedartists | 0:a771927a62fd | 2016 | static unsigned deflate(unsigned char** out, size_t* outsize, |
embeddedartists | 0:a771927a62fd | 2017 | const unsigned char* in, size_t insize, |
embeddedartists | 0:a771927a62fd | 2018 | const LodePNGCompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2019 | { |
embeddedartists | 0:a771927a62fd | 2020 | if(settings->custom_deflate) |
embeddedartists | 0:a771927a62fd | 2021 | { |
embeddedartists | 0:a771927a62fd | 2022 | return settings->custom_deflate(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2023 | } |
embeddedartists | 0:a771927a62fd | 2024 | else |
embeddedartists | 0:a771927a62fd | 2025 | { |
embeddedartists | 0:a771927a62fd | 2026 | return lodepng_deflate(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2027 | } |
embeddedartists | 0:a771927a62fd | 2028 | } |
embeddedartists | 0:a771927a62fd | 2029 | |
embeddedartists | 0:a771927a62fd | 2030 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 2031 | |
embeddedartists | 0:a771927a62fd | 2032 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2033 | /* / Adler32 */ |
embeddedartists | 0:a771927a62fd | 2034 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2035 | |
embeddedartists | 0:a771927a62fd | 2036 | static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len) |
embeddedartists | 0:a771927a62fd | 2037 | { |
embeddedartists | 0:a771927a62fd | 2038 | unsigned s1 = adler & 0xffff; |
embeddedartists | 0:a771927a62fd | 2039 | unsigned s2 = (adler >> 16) & 0xffff; |
embeddedartists | 0:a771927a62fd | 2040 | |
embeddedartists | 0:a771927a62fd | 2041 | while(len > 0) |
embeddedartists | 0:a771927a62fd | 2042 | { |
embeddedartists | 0:a771927a62fd | 2043 | /*at least 5550 sums can be done before the sums overflow, saving a lot of module divisions*/ |
embeddedartists | 0:a771927a62fd | 2044 | unsigned amount = len > 5550 ? 5550 : len; |
embeddedartists | 0:a771927a62fd | 2045 | len -= amount; |
embeddedartists | 0:a771927a62fd | 2046 | while(amount > 0) |
embeddedartists | 0:a771927a62fd | 2047 | { |
embeddedartists | 0:a771927a62fd | 2048 | s1 += (*data++); |
embeddedartists | 0:a771927a62fd | 2049 | s2 += s1; |
embeddedartists | 0:a771927a62fd | 2050 | amount--; |
embeddedartists | 0:a771927a62fd | 2051 | } |
embeddedartists | 0:a771927a62fd | 2052 | s1 %= 65521; |
embeddedartists | 0:a771927a62fd | 2053 | s2 %= 65521; |
embeddedartists | 0:a771927a62fd | 2054 | } |
embeddedartists | 0:a771927a62fd | 2055 | |
embeddedartists | 0:a771927a62fd | 2056 | return (s2 << 16) | s1; |
embeddedartists | 0:a771927a62fd | 2057 | } |
embeddedartists | 0:a771927a62fd | 2058 | |
embeddedartists | 0:a771927a62fd | 2059 | /*Return the adler32 of the bytes data[0..len-1]*/ |
embeddedartists | 0:a771927a62fd | 2060 | static unsigned adler32(const unsigned char* data, unsigned len) |
embeddedartists | 0:a771927a62fd | 2061 | { |
embeddedartists | 0:a771927a62fd | 2062 | return update_adler32(1L, data, len); |
embeddedartists | 0:a771927a62fd | 2063 | } |
embeddedartists | 0:a771927a62fd | 2064 | |
embeddedartists | 0:a771927a62fd | 2065 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2066 | /* / Zlib / */ |
embeddedartists | 0:a771927a62fd | 2067 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2068 | |
embeddedartists | 0:a771927a62fd | 2069 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 2070 | |
embeddedartists | 0:a771927a62fd | 2071 | unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 2072 | size_t insize, const LodePNGDecompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2073 | { |
embeddedartists | 0:a771927a62fd | 2074 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 2075 | unsigned CM, CINFO, FDICT; |
embeddedartists | 0:a771927a62fd | 2076 | |
embeddedartists | 0:a771927a62fd | 2077 | if(insize < 2) return 53; /*error, size of zlib data too small*/ |
embeddedartists | 0:a771927a62fd | 2078 | /*read information from zlib header*/ |
embeddedartists | 0:a771927a62fd | 2079 | if((in[0] * 256 + in[1]) % 31 != 0) |
embeddedartists | 0:a771927a62fd | 2080 | { |
embeddedartists | 0:a771927a62fd | 2081 | /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/ |
embeddedartists | 0:a771927a62fd | 2082 | return 24; |
embeddedartists | 0:a771927a62fd | 2083 | } |
embeddedartists | 0:a771927a62fd | 2084 | |
embeddedartists | 0:a771927a62fd | 2085 | CM = in[0] & 15; |
embeddedartists | 0:a771927a62fd | 2086 | CINFO = (in[0] >> 4) & 15; |
embeddedartists | 0:a771927a62fd | 2087 | /*FCHECK = in[1] & 31;*/ /*FCHECK is already tested above*/ |
embeddedartists | 0:a771927a62fd | 2088 | FDICT = (in[1] >> 5) & 1; |
embeddedartists | 0:a771927a62fd | 2089 | /*FLEVEL = (in[1] >> 6) & 3;*/ /*FLEVEL is not used here*/ |
embeddedartists | 0:a771927a62fd | 2090 | |
embeddedartists | 0:a771927a62fd | 2091 | if(CM != 8 || CINFO > 7) |
embeddedartists | 0:a771927a62fd | 2092 | { |
embeddedartists | 0:a771927a62fd | 2093 | /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/ |
embeddedartists | 0:a771927a62fd | 2094 | return 25; |
embeddedartists | 0:a771927a62fd | 2095 | } |
embeddedartists | 0:a771927a62fd | 2096 | if(FDICT != 0) |
embeddedartists | 0:a771927a62fd | 2097 | { |
embeddedartists | 0:a771927a62fd | 2098 | /*error: the specification of PNG says about the zlib stream: |
embeddedartists | 0:a771927a62fd | 2099 | "The additional flags shall not specify a preset dictionary."*/ |
embeddedartists | 0:a771927a62fd | 2100 | return 26; |
embeddedartists | 0:a771927a62fd | 2101 | } |
embeddedartists | 0:a771927a62fd | 2102 | |
embeddedartists | 0:a771927a62fd | 2103 | error = inflate(out, outsize, in + 2, insize - 2, settings); |
embeddedartists | 0:a771927a62fd | 2104 | if(error) return error; |
embeddedartists | 0:a771927a62fd | 2105 | |
embeddedartists | 0:a771927a62fd | 2106 | if(!settings->ignore_adler32) |
embeddedartists | 0:a771927a62fd | 2107 | { |
embeddedartists | 0:a771927a62fd | 2108 | unsigned ADLER32 = lodepng_read32bitInt(&in[insize - 4]); |
embeddedartists | 0:a771927a62fd | 2109 | unsigned checksum = adler32(*out, (unsigned)(*outsize)); |
embeddedartists | 0:a771927a62fd | 2110 | if(checksum != ADLER32) return 58; /*error, adler checksum not correct, data must be corrupted*/ |
embeddedartists | 0:a771927a62fd | 2111 | } |
embeddedartists | 0:a771927a62fd | 2112 | |
embeddedartists | 0:a771927a62fd | 2113 | return 0; /*no error*/ |
embeddedartists | 0:a771927a62fd | 2114 | } |
embeddedartists | 0:a771927a62fd | 2115 | |
embeddedartists | 0:a771927a62fd | 2116 | static unsigned zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 2117 | size_t insize, const LodePNGDecompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2118 | { |
embeddedartists | 0:a771927a62fd | 2119 | if(settings->custom_zlib) |
embeddedartists | 0:a771927a62fd | 2120 | { |
embeddedartists | 0:a771927a62fd | 2121 | return settings->custom_zlib(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2122 | } |
embeddedartists | 0:a771927a62fd | 2123 | else |
embeddedartists | 0:a771927a62fd | 2124 | { |
embeddedartists | 0:a771927a62fd | 2125 | return lodepng_zlib_decompress(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2126 | } |
embeddedartists | 0:a771927a62fd | 2127 | } |
embeddedartists | 0:a771927a62fd | 2128 | |
embeddedartists | 0:a771927a62fd | 2129 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 2130 | |
embeddedartists | 0:a771927a62fd | 2131 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 2132 | |
embeddedartists | 0:a771927a62fd | 2133 | unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 2134 | size_t insize, const LodePNGCompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2135 | { |
embeddedartists | 0:a771927a62fd | 2136 | /*initially, *out must be NULL and outsize 0, if you just give some random *out |
embeddedartists | 0:a771927a62fd | 2137 | that's pointing to a non allocated buffer, this'll crash*/ |
embeddedartists | 0:a771927a62fd | 2138 | ucvector outv; |
embeddedartists | 0:a771927a62fd | 2139 | size_t i; |
embeddedartists | 0:a771927a62fd | 2140 | unsigned error; |
embeddedartists | 0:a771927a62fd | 2141 | unsigned char* deflatedata = 0; |
embeddedartists | 0:a771927a62fd | 2142 | size_t deflatesize = 0; |
embeddedartists | 0:a771927a62fd | 2143 | |
embeddedartists | 0:a771927a62fd | 2144 | unsigned ADLER32; |
embeddedartists | 0:a771927a62fd | 2145 | /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/ |
embeddedartists | 0:a771927a62fd | 2146 | unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/ |
embeddedartists | 0:a771927a62fd | 2147 | unsigned FLEVEL = 0; |
embeddedartists | 0:a771927a62fd | 2148 | unsigned FDICT = 0; |
embeddedartists | 0:a771927a62fd | 2149 | unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64; |
embeddedartists | 0:a771927a62fd | 2150 | unsigned FCHECK = 31 - CMFFLG % 31; |
embeddedartists | 0:a771927a62fd | 2151 | CMFFLG += FCHECK; |
embeddedartists | 0:a771927a62fd | 2152 | |
embeddedartists | 0:a771927a62fd | 2153 | /*ucvector-controlled version of the output buffer, for dynamic array*/ |
embeddedartists | 0:a771927a62fd | 2154 | ucvector_init_buffer(&outv, *out, *outsize); |
embeddedartists | 0:a771927a62fd | 2155 | |
embeddedartists | 0:a771927a62fd | 2156 | ucvector_push_back(&outv, (unsigned char)(CMFFLG / 256)); |
embeddedartists | 0:a771927a62fd | 2157 | ucvector_push_back(&outv, (unsigned char)(CMFFLG % 256)); |
embeddedartists | 0:a771927a62fd | 2158 | |
embeddedartists | 0:a771927a62fd | 2159 | error = deflate(&deflatedata, &deflatesize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2160 | |
embeddedartists | 0:a771927a62fd | 2161 | if(!error) |
embeddedartists | 0:a771927a62fd | 2162 | { |
embeddedartists | 0:a771927a62fd | 2163 | ADLER32 = adler32(in, (unsigned)insize); |
embeddedartists | 0:a771927a62fd | 2164 | for(i = 0; i < deflatesize; i++) ucvector_push_back(&outv, deflatedata[i]); |
embeddedartists | 0:a771927a62fd | 2165 | lodepng_free(deflatedata); |
embeddedartists | 0:a771927a62fd | 2166 | lodepng_add32bitInt(&outv, ADLER32); |
embeddedartists | 0:a771927a62fd | 2167 | } |
embeddedartists | 0:a771927a62fd | 2168 | |
embeddedartists | 0:a771927a62fd | 2169 | *out = outv.data; |
embeddedartists | 0:a771927a62fd | 2170 | *outsize = outv.size; |
embeddedartists | 0:a771927a62fd | 2171 | |
embeddedartists | 0:a771927a62fd | 2172 | return error; |
embeddedartists | 0:a771927a62fd | 2173 | } |
embeddedartists | 0:a771927a62fd | 2174 | |
embeddedartists | 0:a771927a62fd | 2175 | /* compress using the default or custom zlib function */ |
embeddedartists | 0:a771927a62fd | 2176 | static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 2177 | size_t insize, const LodePNGCompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2178 | { |
embeddedartists | 0:a771927a62fd | 2179 | if(settings->custom_zlib) |
embeddedartists | 0:a771927a62fd | 2180 | { |
embeddedartists | 0:a771927a62fd | 2181 | return settings->custom_zlib(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2182 | } |
embeddedartists | 0:a771927a62fd | 2183 | else |
embeddedartists | 0:a771927a62fd | 2184 | { |
embeddedartists | 0:a771927a62fd | 2185 | return lodepng_zlib_compress(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2186 | } |
embeddedartists | 0:a771927a62fd | 2187 | } |
embeddedartists | 0:a771927a62fd | 2188 | |
embeddedartists | 0:a771927a62fd | 2189 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 2190 | |
embeddedartists | 0:a771927a62fd | 2191 | #else /*no LODEPNG_COMPILE_ZLIB*/ |
embeddedartists | 0:a771927a62fd | 2192 | |
embeddedartists | 0:a771927a62fd | 2193 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 2194 | static unsigned zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 2195 | size_t insize, const LodePNGDecompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2196 | { |
embeddedartists | 0:a771927a62fd | 2197 | if (!settings->custom_zlib) return 87; /*no custom zlib function provided */ |
embeddedartists | 0:a771927a62fd | 2198 | return settings->custom_zlib(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2199 | } |
embeddedartists | 0:a771927a62fd | 2200 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 2201 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 2202 | static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 2203 | size_t insize, const LodePNGCompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2204 | { |
embeddedartists | 0:a771927a62fd | 2205 | if (!settings->custom_zlib) return 87; /*no custom zlib function provided */ |
embeddedartists | 0:a771927a62fd | 2206 | return settings->custom_zlib(out, outsize, in, insize, settings); |
embeddedartists | 0:a771927a62fd | 2207 | } |
embeddedartists | 0:a771927a62fd | 2208 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 2209 | |
embeddedartists | 0:a771927a62fd | 2210 | #endif /*LODEPNG_COMPILE_ZLIB*/ |
embeddedartists | 0:a771927a62fd | 2211 | |
embeddedartists | 0:a771927a62fd | 2212 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2213 | |
embeddedartists | 0:a771927a62fd | 2214 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 2215 | |
embeddedartists | 0:a771927a62fd | 2216 | /*this is a good tradeoff between speed and compression ratio*/ |
embeddedartists | 0:a771927a62fd | 2217 | #define DEFAULT_WINDOWSIZE 2048 |
embeddedartists | 0:a771927a62fd | 2218 | |
embeddedartists | 0:a771927a62fd | 2219 | void lodepng_compress_settings_init(LodePNGCompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2220 | { |
embeddedartists | 0:a771927a62fd | 2221 | /*compress with dynamic huffman tree (not in the mathematical sense, just not the predefined one)*/ |
embeddedartists | 0:a771927a62fd | 2222 | settings->btype = 2; |
embeddedartists | 0:a771927a62fd | 2223 | settings->use_lz77 = 1; |
embeddedartists | 0:a771927a62fd | 2224 | settings->windowsize = DEFAULT_WINDOWSIZE; |
embeddedartists | 0:a771927a62fd | 2225 | settings->minmatch = 3; |
embeddedartists | 0:a771927a62fd | 2226 | settings->nicematch = 128; |
embeddedartists | 0:a771927a62fd | 2227 | settings->lazymatching = 1; |
embeddedartists | 0:a771927a62fd | 2228 | |
embeddedartists | 0:a771927a62fd | 2229 | settings->custom_zlib = 0; |
embeddedartists | 0:a771927a62fd | 2230 | settings->custom_deflate = 0; |
embeddedartists | 0:a771927a62fd | 2231 | settings->custom_context = 0; |
embeddedartists | 0:a771927a62fd | 2232 | } |
embeddedartists | 0:a771927a62fd | 2233 | |
embeddedartists | 0:a771927a62fd | 2234 | const LodePNGCompressSettings lodepng_default_compress_settings = {2, 1, DEFAULT_WINDOWSIZE, 3, 128, 1, 0, 0, 0}; |
embeddedartists | 0:a771927a62fd | 2235 | |
embeddedartists | 0:a771927a62fd | 2236 | |
embeddedartists | 0:a771927a62fd | 2237 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 2238 | |
embeddedartists | 0:a771927a62fd | 2239 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 2240 | |
embeddedartists | 0:a771927a62fd | 2241 | void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings) |
embeddedartists | 0:a771927a62fd | 2242 | { |
embeddedartists | 0:a771927a62fd | 2243 | settings->ignore_adler32 = 0; |
embeddedartists | 0:a771927a62fd | 2244 | |
embeddedartists | 0:a771927a62fd | 2245 | settings->custom_zlib = 0; |
embeddedartists | 0:a771927a62fd | 2246 | settings->custom_inflate = 0; |
embeddedartists | 0:a771927a62fd | 2247 | settings->custom_context = 0; |
embeddedartists | 0:a771927a62fd | 2248 | } |
embeddedartists | 0:a771927a62fd | 2249 | |
embeddedartists | 0:a771927a62fd | 2250 | const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 0, 0, 0}; |
embeddedartists | 0:a771927a62fd | 2251 | |
embeddedartists | 0:a771927a62fd | 2252 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 2253 | |
embeddedartists | 0:a771927a62fd | 2254 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2255 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2256 | /* // End of Zlib related code. Begin of PNG related code. // */ |
embeddedartists | 0:a771927a62fd | 2257 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2258 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2259 | |
embeddedartists | 0:a771927a62fd | 2260 | #ifdef LODEPNG_COMPILE_PNG |
embeddedartists | 0:a771927a62fd | 2261 | |
embeddedartists | 0:a771927a62fd | 2262 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2263 | /* / CRC32 / */ |
embeddedartists | 0:a771927a62fd | 2264 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2265 | |
embeddedartists | 0:a771927a62fd | 2266 | /* CRC polynomial: 0xedb88320 */ |
embeddedartists | 0:a771927a62fd | 2267 | static unsigned lodepng_crc32_table[256] = { |
embeddedartists | 0:a771927a62fd | 2268 | 0u, 1996959894u, 3993919788u, 2567524794u, 124634137u, 1886057615u, 3915621685u, 2657392035u, |
embeddedartists | 0:a771927a62fd | 2269 | 249268274u, 2044508324u, 3772115230u, 2547177864u, 162941995u, 2125561021u, 3887607047u, 2428444049u, |
embeddedartists | 0:a771927a62fd | 2270 | 498536548u, 1789927666u, 4089016648u, 2227061214u, 450548861u, 1843258603u, 4107580753u, 2211677639u, |
embeddedartists | 0:a771927a62fd | 2271 | 325883990u, 1684777152u, 4251122042u, 2321926636u, 335633487u, 1661365465u, 4195302755u, 2366115317u, |
embeddedartists | 0:a771927a62fd | 2272 | 997073096u, 1281953886u, 3579855332u, 2724688242u, 1006888145u, 1258607687u, 3524101629u, 2768942443u, |
embeddedartists | 0:a771927a62fd | 2273 | 901097722u, 1119000684u, 3686517206u, 2898065728u, 853044451u, 1172266101u, 3705015759u, 2882616665u, |
embeddedartists | 0:a771927a62fd | 2274 | 651767980u, 1373503546u, 3369554304u, 3218104598u, 565507253u, 1454621731u, 3485111705u, 3099436303u, |
embeddedartists | 0:a771927a62fd | 2275 | 671266974u, 1594198024u, 3322730930u, 2970347812u, 795835527u, 1483230225u, 3244367275u, 3060149565u, |
embeddedartists | 0:a771927a62fd | 2276 | 1994146192u, 31158534u, 2563907772u, 4023717930u, 1907459465u, 112637215u, 2680153253u, 3904427059u, |
embeddedartists | 0:a771927a62fd | 2277 | 2013776290u, 251722036u, 2517215374u, 3775830040u, 2137656763u, 141376813u, 2439277719u, 3865271297u, |
embeddedartists | 0:a771927a62fd | 2278 | 1802195444u, 476864866u, 2238001368u, 4066508878u, 1812370925u, 453092731u, 2181625025u, 4111451223u, |
embeddedartists | 0:a771927a62fd | 2279 | 1706088902u, 314042704u, 2344532202u, 4240017532u, 1658658271u, 366619977u, 2362670323u, 4224994405u, |
embeddedartists | 0:a771927a62fd | 2280 | 1303535960u, 984961486u, 2747007092u, 3569037538u, 1256170817u, 1037604311u, 2765210733u, 3554079995u, |
embeddedartists | 0:a771927a62fd | 2281 | 1131014506u, 879679996u, 2909243462u, 3663771856u, 1141124467u, 855842277u, 2852801631u, 3708648649u, |
embeddedartists | 0:a771927a62fd | 2282 | 1342533948u, 654459306u, 3188396048u, 3373015174u, 1466479909u, 544179635u, 3110523913u, 3462522015u, |
embeddedartists | 0:a771927a62fd | 2283 | 1591671054u, 702138776u, 2966460450u, 3352799412u, 1504918807u, 783551873u, 3082640443u, 3233442989u, |
embeddedartists | 0:a771927a62fd | 2284 | 3988292384u, 2596254646u, 62317068u, 1957810842u, 3939845945u, 2647816111u, 81470997u, 1943803523u, |
embeddedartists | 0:a771927a62fd | 2285 | 3814918930u, 2489596804u, 225274430u, 2053790376u, 3826175755u, 2466906013u, 167816743u, 2097651377u, |
embeddedartists | 0:a771927a62fd | 2286 | 4027552580u, 2265490386u, 503444072u, 1762050814u, 4150417245u, 2154129355u, 426522225u, 1852507879u, |
embeddedartists | 0:a771927a62fd | 2287 | 4275313526u, 2312317920u, 282753626u, 1742555852u, 4189708143u, 2394877945u, 397917763u, 1622183637u, |
embeddedartists | 0:a771927a62fd | 2288 | 3604390888u, 2714866558u, 953729732u, 1340076626u, 3518719985u, 2797360999u, 1068828381u, 1219638859u, |
embeddedartists | 0:a771927a62fd | 2289 | 3624741850u, 2936675148u, 906185462u, 1090812512u, 3747672003u, 2825379669u, 829329135u, 1181335161u, |
embeddedartists | 0:a771927a62fd | 2290 | 3412177804u, 3160834842u, 628085408u, 1382605366u, 3423369109u, 3138078467u, 570562233u, 1426400815u, |
embeddedartists | 0:a771927a62fd | 2291 | 3317316542u, 2998733608u, 733239954u, 1555261956u, 3268935591u, 3050360625u, 752459403u, 1541320221u, |
embeddedartists | 0:a771927a62fd | 2292 | 2607071920u, 3965973030u, 1969922972u, 40735498u, 2617837225u, 3943577151u, 1913087877u, 83908371u, |
embeddedartists | 0:a771927a62fd | 2293 | 2512341634u, 3803740692u, 2075208622u, 213261112u, 2463272603u, 3855990285u, 2094854071u, 198958881u, |
embeddedartists | 0:a771927a62fd | 2294 | 2262029012u, 4057260610u, 1759359992u, 534414190u, 2176718541u, 4139329115u, 1873836001u, 414664567u, |
embeddedartists | 0:a771927a62fd | 2295 | 2282248934u, 4279200368u, 1711684554u, 285281116u, 2405801727u, 4167216745u, 1634467795u, 376229701u, |
embeddedartists | 0:a771927a62fd | 2296 | 2685067896u, 3608007406u, 1308918612u, 956543938u, 2808555105u, 3495958263u, 1231636301u, 1047427035u, |
embeddedartists | 0:a771927a62fd | 2297 | 2932959818u, 3654703836u, 1088359270u, 936918000u, 2847714899u, 3736837829u, 1202900863u, 817233897u, |
embeddedartists | 0:a771927a62fd | 2298 | 3183342108u, 3401237130u, 1404277552u, 615818150u, 3134207493u, 3453421203u, 1423857449u, 601450431u, |
embeddedartists | 0:a771927a62fd | 2299 | 3009837614u, 3294710456u, 1567103746u, 711928724u, 3020668471u, 3272380065u, 1510334235u, 755167117u |
embeddedartists | 0:a771927a62fd | 2300 | }; |
embeddedartists | 0:a771927a62fd | 2301 | |
embeddedartists | 0:a771927a62fd | 2302 | /*Return the CRC of the bytes buf[0..len-1].*/ |
embeddedartists | 0:a771927a62fd | 2303 | unsigned lodepng_crc32(const unsigned char* buf, size_t len) |
embeddedartists | 0:a771927a62fd | 2304 | { |
embeddedartists | 0:a771927a62fd | 2305 | unsigned c = 0xffffffffL; |
embeddedartists | 0:a771927a62fd | 2306 | size_t n; |
embeddedartists | 0:a771927a62fd | 2307 | |
embeddedartists | 0:a771927a62fd | 2308 | for(n = 0; n < len; n++) |
embeddedartists | 0:a771927a62fd | 2309 | { |
embeddedartists | 0:a771927a62fd | 2310 | c = lodepng_crc32_table[(c ^ buf[n]) & 0xff] ^ (c >> 8); |
embeddedartists | 0:a771927a62fd | 2311 | } |
embeddedartists | 0:a771927a62fd | 2312 | return c ^ 0xffffffffL; |
embeddedartists | 0:a771927a62fd | 2313 | } |
embeddedartists | 0:a771927a62fd | 2314 | |
embeddedartists | 0:a771927a62fd | 2315 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2316 | /* / Reading and writing single bits and bytes from/to stream for LodePNG / */ |
embeddedartists | 0:a771927a62fd | 2317 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2318 | |
embeddedartists | 0:a771927a62fd | 2319 | static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream) |
embeddedartists | 0:a771927a62fd | 2320 | { |
embeddedartists | 0:a771927a62fd | 2321 | unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1); |
embeddedartists | 0:a771927a62fd | 2322 | (*bitpointer)++; |
embeddedartists | 0:a771927a62fd | 2323 | return result; |
embeddedartists | 0:a771927a62fd | 2324 | } |
embeddedartists | 0:a771927a62fd | 2325 | |
embeddedartists | 0:a771927a62fd | 2326 | static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) |
embeddedartists | 0:a771927a62fd | 2327 | { |
embeddedartists | 0:a771927a62fd | 2328 | unsigned result = 0; |
embeddedartists | 0:a771927a62fd | 2329 | size_t i; |
embeddedartists | 0:a771927a62fd | 2330 | for(i = nbits - 1; i < nbits; i--) |
embeddedartists | 0:a771927a62fd | 2331 | { |
embeddedartists | 0:a771927a62fd | 2332 | result += (unsigned)readBitFromReversedStream(bitpointer, bitstream) << i; |
embeddedartists | 0:a771927a62fd | 2333 | } |
embeddedartists | 0:a771927a62fd | 2334 | return result; |
embeddedartists | 0:a771927a62fd | 2335 | } |
embeddedartists | 0:a771927a62fd | 2336 | |
embeddedartists | 0:a771927a62fd | 2337 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 2338 | static void setBitOfReversedStream0(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) |
embeddedartists | 0:a771927a62fd | 2339 | { |
embeddedartists | 0:a771927a62fd | 2340 | /*the current bit in bitstream must be 0 for this to work*/ |
embeddedartists | 0:a771927a62fd | 2341 | if(bit) |
embeddedartists | 0:a771927a62fd | 2342 | { |
embeddedartists | 0:a771927a62fd | 2343 | /*earlier bit of huffman code is in a lesser significant bit of an earlier byte*/ |
embeddedartists | 0:a771927a62fd | 2344 | bitstream[(*bitpointer) >> 3] |= (bit << (7 - ((*bitpointer) & 0x7))); |
embeddedartists | 0:a771927a62fd | 2345 | } |
embeddedartists | 0:a771927a62fd | 2346 | (*bitpointer)++; |
embeddedartists | 0:a771927a62fd | 2347 | } |
embeddedartists | 0:a771927a62fd | 2348 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 2349 | |
embeddedartists | 0:a771927a62fd | 2350 | static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) |
embeddedartists | 0:a771927a62fd | 2351 | { |
embeddedartists | 0:a771927a62fd | 2352 | /*the current bit in bitstream may be 0 or 1 for this to work*/ |
embeddedartists | 0:a771927a62fd | 2353 | if(bit == 0) bitstream[(*bitpointer) >> 3] &= (unsigned char)(~(1 << (7 - ((*bitpointer) & 0x7)))); |
embeddedartists | 0:a771927a62fd | 2354 | else bitstream[(*bitpointer) >> 3] |= (1 << (7 - ((*bitpointer) & 0x7))); |
embeddedartists | 0:a771927a62fd | 2355 | (*bitpointer)++; |
embeddedartists | 0:a771927a62fd | 2356 | } |
embeddedartists | 0:a771927a62fd | 2357 | |
embeddedartists | 0:a771927a62fd | 2358 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2359 | /* / PNG chunks / */ |
embeddedartists | 0:a771927a62fd | 2360 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2361 | |
embeddedartists | 0:a771927a62fd | 2362 | unsigned lodepng_chunk_length(const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2363 | { |
embeddedartists | 0:a771927a62fd | 2364 | return lodepng_read32bitInt(&chunk[0]); |
embeddedartists | 0:a771927a62fd | 2365 | } |
embeddedartists | 0:a771927a62fd | 2366 | |
embeddedartists | 0:a771927a62fd | 2367 | void lodepng_chunk_type(char type[5], const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2368 | { |
embeddedartists | 0:a771927a62fd | 2369 | unsigned i; |
embeddedartists | 0:a771927a62fd | 2370 | for(i = 0; i < 4; i++) type[i] = chunk[4 + i]; |
embeddedartists | 0:a771927a62fd | 2371 | type[4] = 0; /*null termination char*/ |
embeddedartists | 0:a771927a62fd | 2372 | } |
embeddedartists | 0:a771927a62fd | 2373 | |
embeddedartists | 0:a771927a62fd | 2374 | unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type) |
embeddedartists | 0:a771927a62fd | 2375 | { |
embeddedartists | 0:a771927a62fd | 2376 | if(strlen(type) != 4) return 0; |
embeddedartists | 0:a771927a62fd | 2377 | return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]); |
embeddedartists | 0:a771927a62fd | 2378 | } |
embeddedartists | 0:a771927a62fd | 2379 | |
embeddedartists | 0:a771927a62fd | 2380 | unsigned char lodepng_chunk_ancillary(const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2381 | { |
embeddedartists | 0:a771927a62fd | 2382 | return((chunk[4] & 32) != 0); |
embeddedartists | 0:a771927a62fd | 2383 | } |
embeddedartists | 0:a771927a62fd | 2384 | |
embeddedartists | 0:a771927a62fd | 2385 | unsigned char lodepng_chunk_private(const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2386 | { |
embeddedartists | 0:a771927a62fd | 2387 | return((chunk[6] & 32) != 0); |
embeddedartists | 0:a771927a62fd | 2388 | } |
embeddedartists | 0:a771927a62fd | 2389 | |
embeddedartists | 0:a771927a62fd | 2390 | unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2391 | { |
embeddedartists | 0:a771927a62fd | 2392 | return((chunk[7] & 32) != 0); |
embeddedartists | 0:a771927a62fd | 2393 | } |
embeddedartists | 0:a771927a62fd | 2394 | |
embeddedartists | 0:a771927a62fd | 2395 | unsigned char* lodepng_chunk_data(unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2396 | { |
embeddedartists | 0:a771927a62fd | 2397 | return &chunk[8]; |
embeddedartists | 0:a771927a62fd | 2398 | } |
embeddedartists | 0:a771927a62fd | 2399 | |
embeddedartists | 0:a771927a62fd | 2400 | const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2401 | { |
embeddedartists | 0:a771927a62fd | 2402 | return &chunk[8]; |
embeddedartists | 0:a771927a62fd | 2403 | } |
embeddedartists | 0:a771927a62fd | 2404 | |
embeddedartists | 0:a771927a62fd | 2405 | unsigned lodepng_chunk_check_crc(const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2406 | { |
embeddedartists | 0:a771927a62fd | 2407 | unsigned length = lodepng_chunk_length(chunk); |
embeddedartists | 0:a771927a62fd | 2408 | unsigned CRC = lodepng_read32bitInt(&chunk[length + 8]); |
embeddedartists | 0:a771927a62fd | 2409 | /*the CRC is taken of the data and the 4 chunk type letters, not the length*/ |
embeddedartists | 0:a771927a62fd | 2410 | unsigned checksum = lodepng_crc32(&chunk[4], length + 4); |
embeddedartists | 0:a771927a62fd | 2411 | if(CRC != checksum) return 1; |
embeddedartists | 0:a771927a62fd | 2412 | else return 0; |
embeddedartists | 0:a771927a62fd | 2413 | } |
embeddedartists | 0:a771927a62fd | 2414 | |
embeddedartists | 0:a771927a62fd | 2415 | void lodepng_chunk_generate_crc(unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2416 | { |
embeddedartists | 0:a771927a62fd | 2417 | unsigned length = lodepng_chunk_length(chunk); |
embeddedartists | 0:a771927a62fd | 2418 | unsigned CRC = lodepng_crc32(&chunk[4], length + 4); |
embeddedartists | 0:a771927a62fd | 2419 | lodepng_set32bitInt(chunk + 8 + length, CRC); |
embeddedartists | 0:a771927a62fd | 2420 | } |
embeddedartists | 0:a771927a62fd | 2421 | |
embeddedartists | 0:a771927a62fd | 2422 | unsigned char* lodepng_chunk_next(unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2423 | { |
embeddedartists | 0:a771927a62fd | 2424 | unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12; |
embeddedartists | 0:a771927a62fd | 2425 | return &chunk[total_chunk_length]; |
embeddedartists | 0:a771927a62fd | 2426 | } |
embeddedartists | 0:a771927a62fd | 2427 | |
embeddedartists | 0:a771927a62fd | 2428 | const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2429 | { |
embeddedartists | 0:a771927a62fd | 2430 | unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12; |
embeddedartists | 0:a771927a62fd | 2431 | return &chunk[total_chunk_length]; |
embeddedartists | 0:a771927a62fd | 2432 | } |
embeddedartists | 0:a771927a62fd | 2433 | |
embeddedartists | 0:a771927a62fd | 2434 | unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk) |
embeddedartists | 0:a771927a62fd | 2435 | { |
embeddedartists | 0:a771927a62fd | 2436 | unsigned i; |
embeddedartists | 0:a771927a62fd | 2437 | unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12; |
embeddedartists | 0:a771927a62fd | 2438 | unsigned char *chunk_start, *new_buffer; |
embeddedartists | 0:a771927a62fd | 2439 | size_t new_length = (*outlength) + total_chunk_length; |
embeddedartists | 0:a771927a62fd | 2440 | if(new_length < total_chunk_length || new_length < (*outlength)) return 77; /*integer overflow happened*/ |
embeddedartists | 0:a771927a62fd | 2441 | |
embeddedartists | 0:a771927a62fd | 2442 | new_buffer = (unsigned char*)lodepng_realloc(*out, new_length); |
embeddedartists | 0:a771927a62fd | 2443 | if(!new_buffer) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 2444 | (*out) = new_buffer; |
embeddedartists | 0:a771927a62fd | 2445 | (*outlength) = new_length; |
embeddedartists | 0:a771927a62fd | 2446 | chunk_start = &(*out)[new_length - total_chunk_length]; |
embeddedartists | 0:a771927a62fd | 2447 | |
embeddedartists | 0:a771927a62fd | 2448 | for(i = 0; i < total_chunk_length; i++) chunk_start[i] = chunk[i]; |
embeddedartists | 0:a771927a62fd | 2449 | |
embeddedartists | 0:a771927a62fd | 2450 | return 0; |
embeddedartists | 0:a771927a62fd | 2451 | } |
embeddedartists | 0:a771927a62fd | 2452 | |
embeddedartists | 0:a771927a62fd | 2453 | unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length, |
embeddedartists | 0:a771927a62fd | 2454 | const char* type, const unsigned char* data) |
embeddedartists | 0:a771927a62fd | 2455 | { |
embeddedartists | 0:a771927a62fd | 2456 | unsigned i; |
embeddedartists | 0:a771927a62fd | 2457 | unsigned char *chunk, *new_buffer; |
embeddedartists | 0:a771927a62fd | 2458 | size_t new_length = (*outlength) + length + 12; |
embeddedartists | 0:a771927a62fd | 2459 | if(new_length < length + 12 || new_length < (*outlength)) return 77; /*integer overflow happened*/ |
embeddedartists | 0:a771927a62fd | 2460 | new_buffer = (unsigned char*)lodepng_realloc(*out, new_length); |
embeddedartists | 0:a771927a62fd | 2461 | if(!new_buffer) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 2462 | (*out) = new_buffer; |
embeddedartists | 0:a771927a62fd | 2463 | (*outlength) = new_length; |
embeddedartists | 0:a771927a62fd | 2464 | chunk = &(*out)[(*outlength) - length - 12]; |
embeddedartists | 0:a771927a62fd | 2465 | |
embeddedartists | 0:a771927a62fd | 2466 | /*1: length*/ |
embeddedartists | 0:a771927a62fd | 2467 | lodepng_set32bitInt(chunk, (unsigned)length); |
embeddedartists | 0:a771927a62fd | 2468 | |
embeddedartists | 0:a771927a62fd | 2469 | /*2: chunk name (4 letters)*/ |
embeddedartists | 0:a771927a62fd | 2470 | chunk[4] = type[0]; |
embeddedartists | 0:a771927a62fd | 2471 | chunk[5] = type[1]; |
embeddedartists | 0:a771927a62fd | 2472 | chunk[6] = type[2]; |
embeddedartists | 0:a771927a62fd | 2473 | chunk[7] = type[3]; |
embeddedartists | 0:a771927a62fd | 2474 | |
embeddedartists | 0:a771927a62fd | 2475 | /*3: the data*/ |
embeddedartists | 0:a771927a62fd | 2476 | for(i = 0; i < length; i++) chunk[8 + i] = data[i]; |
embeddedartists | 0:a771927a62fd | 2477 | |
embeddedartists | 0:a771927a62fd | 2478 | /*4: CRC (of the chunkname characters and the data)*/ |
embeddedartists | 0:a771927a62fd | 2479 | lodepng_chunk_generate_crc(chunk); |
embeddedartists | 0:a771927a62fd | 2480 | |
embeddedartists | 0:a771927a62fd | 2481 | return 0; |
embeddedartists | 0:a771927a62fd | 2482 | } |
embeddedartists | 0:a771927a62fd | 2483 | |
embeddedartists | 0:a771927a62fd | 2484 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2485 | /* / Color types and such / */ |
embeddedartists | 0:a771927a62fd | 2486 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2487 | |
embeddedartists | 0:a771927a62fd | 2488 | /*return type is a LodePNG error code*/ |
embeddedartists | 0:a771927a62fd | 2489 | static unsigned checkColorValidity(LodePNGColorType colortype, unsigned bd) /*bd = bitdepth*/ |
embeddedartists | 0:a771927a62fd | 2490 | { |
embeddedartists | 0:a771927a62fd | 2491 | switch(colortype) |
embeddedartists | 0:a771927a62fd | 2492 | { |
embeddedartists | 0:a771927a62fd | 2493 | case 0: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; /*grey*/ |
embeddedartists | 0:a771927a62fd | 2494 | case 2: if(!( bd == 8 || bd == 16)) return 37; break; /*RGB*/ |
embeddedartists | 0:a771927a62fd | 2495 | case 3: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; break; /*palette*/ |
embeddedartists | 0:a771927a62fd | 2496 | case 4: if(!( bd == 8 || bd == 16)) return 37; break; /*grey + alpha*/ |
embeddedartists | 0:a771927a62fd | 2497 | case 6: if(!( bd == 8 || bd == 16)) return 37; break; /*RGBA*/ |
embeddedartists | 0:a771927a62fd | 2498 | default: return 31; |
embeddedartists | 0:a771927a62fd | 2499 | } |
embeddedartists | 0:a771927a62fd | 2500 | return 0; /*allowed color type / bits combination*/ |
embeddedartists | 0:a771927a62fd | 2501 | } |
embeddedartists | 0:a771927a62fd | 2502 | |
embeddedartists | 0:a771927a62fd | 2503 | static unsigned getNumColorChannels(LodePNGColorType colortype) |
embeddedartists | 0:a771927a62fd | 2504 | { |
embeddedartists | 0:a771927a62fd | 2505 | switch(colortype) |
embeddedartists | 0:a771927a62fd | 2506 | { |
embeddedartists | 0:a771927a62fd | 2507 | case 0: return 1; /*grey*/ |
embeddedartists | 0:a771927a62fd | 2508 | case 2: return 3; /*RGB*/ |
embeddedartists | 0:a771927a62fd | 2509 | case 3: return 1; /*palette*/ |
embeddedartists | 0:a771927a62fd | 2510 | case 4: return 2; /*grey + alpha*/ |
embeddedartists | 0:a771927a62fd | 2511 | case 6: return 4; /*RGBA*/ |
embeddedartists | 0:a771927a62fd | 2512 | } |
embeddedartists | 0:a771927a62fd | 2513 | return 0; /*unexisting color type*/ |
embeddedartists | 0:a771927a62fd | 2514 | } |
embeddedartists | 0:a771927a62fd | 2515 | |
embeddedartists | 0:a771927a62fd | 2516 | static unsigned lodepng_get_bpp_lct(LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 2517 | { |
embeddedartists | 0:a771927a62fd | 2518 | /*bits per pixel is amount of channels * bits per channel*/ |
embeddedartists | 0:a771927a62fd | 2519 | return getNumColorChannels(colortype) * bitdepth; |
embeddedartists | 0:a771927a62fd | 2520 | } |
embeddedartists | 0:a771927a62fd | 2521 | |
embeddedartists | 0:a771927a62fd | 2522 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2523 | |
embeddedartists | 0:a771927a62fd | 2524 | void lodepng_color_mode_init(LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2525 | { |
embeddedartists | 0:a771927a62fd | 2526 | info->key_defined = 0; |
embeddedartists | 0:a771927a62fd | 2527 | info->key_r = info->key_g = info->key_b = 0; |
embeddedartists | 0:a771927a62fd | 2528 | info->colortype = LCT_RGBA; |
embeddedartists | 0:a771927a62fd | 2529 | info->bitdepth = 8; |
embeddedartists | 0:a771927a62fd | 2530 | info->palette = 0; |
embeddedartists | 0:a771927a62fd | 2531 | info->palettesize = 0; |
embeddedartists | 0:a771927a62fd | 2532 | } |
embeddedartists | 0:a771927a62fd | 2533 | |
embeddedartists | 0:a771927a62fd | 2534 | void lodepng_color_mode_cleanup(LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2535 | { |
embeddedartists | 0:a771927a62fd | 2536 | lodepng_palette_clear(info); |
embeddedartists | 0:a771927a62fd | 2537 | } |
embeddedartists | 0:a771927a62fd | 2538 | |
embeddedartists | 0:a771927a62fd | 2539 | unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source) |
embeddedartists | 0:a771927a62fd | 2540 | { |
embeddedartists | 0:a771927a62fd | 2541 | size_t i; |
embeddedartists | 0:a771927a62fd | 2542 | lodepng_color_mode_cleanup(dest); |
embeddedartists | 0:a771927a62fd | 2543 | *dest = *source; |
embeddedartists | 0:a771927a62fd | 2544 | if(source->palette) |
embeddedartists | 0:a771927a62fd | 2545 | { |
embeddedartists | 0:a771927a62fd | 2546 | dest->palette = (unsigned char*)lodepng_malloc(1024); |
embeddedartists | 0:a771927a62fd | 2547 | if(!dest->palette && source->palettesize) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 2548 | for(i = 0; i < source->palettesize * 4; i++) dest->palette[i] = source->palette[i]; |
embeddedartists | 0:a771927a62fd | 2549 | } |
embeddedartists | 0:a771927a62fd | 2550 | return 0; |
embeddedartists | 0:a771927a62fd | 2551 | } |
embeddedartists | 0:a771927a62fd | 2552 | |
embeddedartists | 0:a771927a62fd | 2553 | static int lodepng_color_mode_equal(const LodePNGColorMode* a, const LodePNGColorMode* b) |
embeddedartists | 0:a771927a62fd | 2554 | { |
embeddedartists | 0:a771927a62fd | 2555 | size_t i; |
embeddedartists | 0:a771927a62fd | 2556 | if(a->colortype != b->colortype) return 0; |
embeddedartists | 0:a771927a62fd | 2557 | if(a->bitdepth != b->bitdepth) return 0; |
embeddedartists | 0:a771927a62fd | 2558 | if(a->key_defined != b->key_defined) return 0; |
embeddedartists | 0:a771927a62fd | 2559 | if(a->key_defined) |
embeddedartists | 0:a771927a62fd | 2560 | { |
embeddedartists | 0:a771927a62fd | 2561 | if(a->key_r != b->key_r) return 0; |
embeddedartists | 0:a771927a62fd | 2562 | if(a->key_g != b->key_g) return 0; |
embeddedartists | 0:a771927a62fd | 2563 | if(a->key_b != b->key_b) return 0; |
embeddedartists | 0:a771927a62fd | 2564 | } |
embeddedartists | 0:a771927a62fd | 2565 | if(a->palettesize != b->palettesize) return 0; |
embeddedartists | 0:a771927a62fd | 2566 | for(i = 0; i < a->palettesize * 4; i++) |
embeddedartists | 0:a771927a62fd | 2567 | { |
embeddedartists | 0:a771927a62fd | 2568 | if(a->palette[i] != b->palette[i]) return 0; |
embeddedartists | 0:a771927a62fd | 2569 | } |
embeddedartists | 0:a771927a62fd | 2570 | return 1; |
embeddedartists | 0:a771927a62fd | 2571 | } |
embeddedartists | 0:a771927a62fd | 2572 | |
embeddedartists | 0:a771927a62fd | 2573 | void lodepng_palette_clear(LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2574 | { |
embeddedartists | 0:a771927a62fd | 2575 | if(info->palette) lodepng_free(info->palette); |
embeddedartists | 0:a771927a62fd | 2576 | info->palette = 0; |
embeddedartists | 0:a771927a62fd | 2577 | info->palettesize = 0; |
embeddedartists | 0:a771927a62fd | 2578 | } |
embeddedartists | 0:a771927a62fd | 2579 | |
embeddedartists | 0:a771927a62fd | 2580 | unsigned lodepng_palette_add(LodePNGColorMode* info, |
embeddedartists | 0:a771927a62fd | 2581 | unsigned char r, unsigned char g, unsigned char b, unsigned char a) |
embeddedartists | 0:a771927a62fd | 2582 | { |
embeddedartists | 0:a771927a62fd | 2583 | unsigned char* data; |
embeddedartists | 0:a771927a62fd | 2584 | /*the same resize technique as C++ std::vectors is used, and here it's made so that for a palette with |
embeddedartists | 0:a771927a62fd | 2585 | the max of 256 colors, it'll have the exact alloc size*/ |
embeddedartists | 0:a771927a62fd | 2586 | if(!info->palette) /*allocate palette if empty*/ |
embeddedartists | 0:a771927a62fd | 2587 | { |
embeddedartists | 0:a771927a62fd | 2588 | /*room for 256 colors with 4 bytes each*/ |
embeddedartists | 0:a771927a62fd | 2589 | data = (unsigned char*)lodepng_realloc(info->palette, 1024); |
embeddedartists | 0:a771927a62fd | 2590 | if(!data) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 2591 | else info->palette = data; |
embeddedartists | 0:a771927a62fd | 2592 | } |
embeddedartists | 0:a771927a62fd | 2593 | info->palette[4 * info->palettesize + 0] = r; |
embeddedartists | 0:a771927a62fd | 2594 | info->palette[4 * info->palettesize + 1] = g; |
embeddedartists | 0:a771927a62fd | 2595 | info->palette[4 * info->palettesize + 2] = b; |
embeddedartists | 0:a771927a62fd | 2596 | info->palette[4 * info->palettesize + 3] = a; |
embeddedartists | 0:a771927a62fd | 2597 | info->palettesize++; |
embeddedartists | 0:a771927a62fd | 2598 | return 0; |
embeddedartists | 0:a771927a62fd | 2599 | } |
embeddedartists | 0:a771927a62fd | 2600 | |
embeddedartists | 0:a771927a62fd | 2601 | unsigned lodepng_get_bpp(const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2602 | { |
embeddedartists | 0:a771927a62fd | 2603 | /*calculate bits per pixel out of colortype and bitdepth*/ |
embeddedartists | 0:a771927a62fd | 2604 | return lodepng_get_bpp_lct(info->colortype, info->bitdepth); |
embeddedartists | 0:a771927a62fd | 2605 | } |
embeddedartists | 0:a771927a62fd | 2606 | |
embeddedartists | 0:a771927a62fd | 2607 | unsigned lodepng_get_channels(const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2608 | { |
embeddedartists | 0:a771927a62fd | 2609 | return getNumColorChannels(info->colortype); |
embeddedartists | 0:a771927a62fd | 2610 | } |
embeddedartists | 0:a771927a62fd | 2611 | |
embeddedartists | 0:a771927a62fd | 2612 | unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2613 | { |
embeddedartists | 0:a771927a62fd | 2614 | return info->colortype == LCT_GREY || info->colortype == LCT_GREY_ALPHA; |
embeddedartists | 0:a771927a62fd | 2615 | } |
embeddedartists | 0:a771927a62fd | 2616 | |
embeddedartists | 0:a771927a62fd | 2617 | unsigned lodepng_is_alpha_type(const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2618 | { |
embeddedartists | 0:a771927a62fd | 2619 | return (info->colortype & 4) != 0; /*4 or 6*/ |
embeddedartists | 0:a771927a62fd | 2620 | } |
embeddedartists | 0:a771927a62fd | 2621 | |
embeddedartists | 0:a771927a62fd | 2622 | unsigned lodepng_is_palette_type(const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2623 | { |
embeddedartists | 0:a771927a62fd | 2624 | return info->colortype == LCT_PALETTE; |
embeddedartists | 0:a771927a62fd | 2625 | } |
embeddedartists | 0:a771927a62fd | 2626 | |
embeddedartists | 0:a771927a62fd | 2627 | unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2628 | { |
embeddedartists | 0:a771927a62fd | 2629 | size_t i; |
embeddedartists | 0:a771927a62fd | 2630 | for(i = 0; i < info->palettesize; i++) |
embeddedartists | 0:a771927a62fd | 2631 | { |
embeddedartists | 0:a771927a62fd | 2632 | if(info->palette[i * 4 + 3] < 255) return 1; |
embeddedartists | 0:a771927a62fd | 2633 | } |
embeddedartists | 0:a771927a62fd | 2634 | return 0; |
embeddedartists | 0:a771927a62fd | 2635 | } |
embeddedartists | 0:a771927a62fd | 2636 | |
embeddedartists | 0:a771927a62fd | 2637 | unsigned lodepng_can_have_alpha(const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 2638 | { |
embeddedartists | 0:a771927a62fd | 2639 | return info->key_defined |
embeddedartists | 0:a771927a62fd | 2640 | || lodepng_is_alpha_type(info) |
embeddedartists | 0:a771927a62fd | 2641 | || lodepng_has_palette_alpha(info); |
embeddedartists | 0:a771927a62fd | 2642 | } |
embeddedartists | 0:a771927a62fd | 2643 | |
embeddedartists | 0:a771927a62fd | 2644 | size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color) |
embeddedartists | 0:a771927a62fd | 2645 | { |
embeddedartists | 0:a771927a62fd | 2646 | return (w * h * lodepng_get_bpp(color) + 7) / 8; |
embeddedartists | 0:a771927a62fd | 2647 | } |
embeddedartists | 0:a771927a62fd | 2648 | |
embeddedartists | 0:a771927a62fd | 2649 | size_t lodepng_get_raw_size_lct(unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 2650 | { |
embeddedartists | 0:a771927a62fd | 2651 | return (w * h * lodepng_get_bpp_lct(colortype, bitdepth) + 7) / 8; |
embeddedartists | 0:a771927a62fd | 2652 | } |
embeddedartists | 0:a771927a62fd | 2653 | |
embeddedartists | 0:a771927a62fd | 2654 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 2655 | |
embeddedartists | 0:a771927a62fd | 2656 | static void LodePNGUnknownChunks_init(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2657 | { |
embeddedartists | 0:a771927a62fd | 2658 | unsigned i; |
embeddedartists | 0:a771927a62fd | 2659 | for(i = 0; i < 3; i++) info->unknown_chunks_data[i] = 0; |
embeddedartists | 0:a771927a62fd | 2660 | for(i = 0; i < 3; i++) info->unknown_chunks_size[i] = 0; |
embeddedartists | 0:a771927a62fd | 2661 | } |
embeddedartists | 0:a771927a62fd | 2662 | |
embeddedartists | 0:a771927a62fd | 2663 | static void LodePNGUnknownChunks_cleanup(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2664 | { |
embeddedartists | 0:a771927a62fd | 2665 | unsigned i; |
embeddedartists | 0:a771927a62fd | 2666 | for(i = 0; i < 3; i++) lodepng_free(info->unknown_chunks_data[i]); |
embeddedartists | 0:a771927a62fd | 2667 | } |
embeddedartists | 0:a771927a62fd | 2668 | |
embeddedartists | 0:a771927a62fd | 2669 | static unsigned LodePNGUnknownChunks_copy(LodePNGInfo* dest, const LodePNGInfo* src) |
embeddedartists | 0:a771927a62fd | 2670 | { |
embeddedartists | 0:a771927a62fd | 2671 | unsigned i; |
embeddedartists | 0:a771927a62fd | 2672 | |
embeddedartists | 0:a771927a62fd | 2673 | LodePNGUnknownChunks_cleanup(dest); |
embeddedartists | 0:a771927a62fd | 2674 | |
embeddedartists | 0:a771927a62fd | 2675 | for(i = 0; i < 3; i++) |
embeddedartists | 0:a771927a62fd | 2676 | { |
embeddedartists | 0:a771927a62fd | 2677 | size_t j; |
embeddedartists | 0:a771927a62fd | 2678 | dest->unknown_chunks_size[i] = src->unknown_chunks_size[i]; |
embeddedartists | 0:a771927a62fd | 2679 | dest->unknown_chunks_data[i] = (unsigned char*)lodepng_malloc(src->unknown_chunks_size[i]); |
embeddedartists | 0:a771927a62fd | 2680 | if(!dest->unknown_chunks_data[i] && dest->unknown_chunks_size[i]) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 2681 | for(j = 0; j < src->unknown_chunks_size[i]; j++) |
embeddedartists | 0:a771927a62fd | 2682 | { |
embeddedartists | 0:a771927a62fd | 2683 | dest->unknown_chunks_data[i][j] = src->unknown_chunks_data[i][j]; |
embeddedartists | 0:a771927a62fd | 2684 | } |
embeddedartists | 0:a771927a62fd | 2685 | } |
embeddedartists | 0:a771927a62fd | 2686 | |
embeddedartists | 0:a771927a62fd | 2687 | return 0; |
embeddedartists | 0:a771927a62fd | 2688 | } |
embeddedartists | 0:a771927a62fd | 2689 | |
embeddedartists | 0:a771927a62fd | 2690 | /******************************************************************************/ |
embeddedartists | 0:a771927a62fd | 2691 | |
embeddedartists | 0:a771927a62fd | 2692 | static void LodePNGText_init(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2693 | { |
embeddedartists | 0:a771927a62fd | 2694 | info->text_num = 0; |
embeddedartists | 0:a771927a62fd | 2695 | info->text_keys = NULL; |
embeddedartists | 0:a771927a62fd | 2696 | info->text_strings = NULL; |
embeddedartists | 0:a771927a62fd | 2697 | } |
embeddedartists | 0:a771927a62fd | 2698 | |
embeddedartists | 0:a771927a62fd | 2699 | static void LodePNGText_cleanup(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2700 | { |
embeddedartists | 0:a771927a62fd | 2701 | size_t i; |
embeddedartists | 0:a771927a62fd | 2702 | for(i = 0; i < info->text_num; i++) |
embeddedartists | 0:a771927a62fd | 2703 | { |
embeddedartists | 0:a771927a62fd | 2704 | string_cleanup(&info->text_keys[i]); |
embeddedartists | 0:a771927a62fd | 2705 | string_cleanup(&info->text_strings[i]); |
embeddedartists | 0:a771927a62fd | 2706 | } |
embeddedartists | 0:a771927a62fd | 2707 | lodepng_free(info->text_keys); |
embeddedartists | 0:a771927a62fd | 2708 | lodepng_free(info->text_strings); |
embeddedartists | 0:a771927a62fd | 2709 | } |
embeddedartists | 0:a771927a62fd | 2710 | |
embeddedartists | 0:a771927a62fd | 2711 | static unsigned LodePNGText_copy(LodePNGInfo* dest, const LodePNGInfo* source) |
embeddedartists | 0:a771927a62fd | 2712 | { |
embeddedartists | 0:a771927a62fd | 2713 | size_t i = 0; |
embeddedartists | 0:a771927a62fd | 2714 | dest->text_keys = 0; |
embeddedartists | 0:a771927a62fd | 2715 | dest->text_strings = 0; |
embeddedartists | 0:a771927a62fd | 2716 | dest->text_num = 0; |
embeddedartists | 0:a771927a62fd | 2717 | for(i = 0; i < source->text_num; i++) |
embeddedartists | 0:a771927a62fd | 2718 | { |
embeddedartists | 0:a771927a62fd | 2719 | CERROR_TRY_RETURN(lodepng_add_text(dest, source->text_keys[i], source->text_strings[i])); |
embeddedartists | 0:a771927a62fd | 2720 | } |
embeddedartists | 0:a771927a62fd | 2721 | return 0; |
embeddedartists | 0:a771927a62fd | 2722 | } |
embeddedartists | 0:a771927a62fd | 2723 | |
embeddedartists | 0:a771927a62fd | 2724 | void lodepng_clear_text(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2725 | { |
embeddedartists | 0:a771927a62fd | 2726 | LodePNGText_cleanup(info); |
embeddedartists | 0:a771927a62fd | 2727 | } |
embeddedartists | 0:a771927a62fd | 2728 | |
embeddedartists | 0:a771927a62fd | 2729 | unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str) |
embeddedartists | 0:a771927a62fd | 2730 | { |
embeddedartists | 0:a771927a62fd | 2731 | char** new_keys = (char**)(lodepng_realloc(info->text_keys, sizeof(char*) * (info->text_num + 1))); |
embeddedartists | 0:a771927a62fd | 2732 | char** new_strings = (char**)(lodepng_realloc(info->text_strings, sizeof(char*) * (info->text_num + 1))); |
embeddedartists | 0:a771927a62fd | 2733 | if(!new_keys || !new_strings) |
embeddedartists | 0:a771927a62fd | 2734 | { |
embeddedartists | 0:a771927a62fd | 2735 | lodepng_free(new_keys); |
embeddedartists | 0:a771927a62fd | 2736 | lodepng_free(new_strings); |
embeddedartists | 0:a771927a62fd | 2737 | return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 2738 | } |
embeddedartists | 0:a771927a62fd | 2739 | |
embeddedartists | 0:a771927a62fd | 2740 | info->text_num++; |
embeddedartists | 0:a771927a62fd | 2741 | info->text_keys = new_keys; |
embeddedartists | 0:a771927a62fd | 2742 | info->text_strings = new_strings; |
embeddedartists | 0:a771927a62fd | 2743 | |
embeddedartists | 0:a771927a62fd | 2744 | string_init(&info->text_keys[info->text_num - 1]); |
embeddedartists | 0:a771927a62fd | 2745 | string_set(&info->text_keys[info->text_num - 1], key); |
embeddedartists | 0:a771927a62fd | 2746 | |
embeddedartists | 0:a771927a62fd | 2747 | string_init(&info->text_strings[info->text_num - 1]); |
embeddedartists | 0:a771927a62fd | 2748 | string_set(&info->text_strings[info->text_num - 1], str); |
embeddedartists | 0:a771927a62fd | 2749 | |
embeddedartists | 0:a771927a62fd | 2750 | return 0; |
embeddedartists | 0:a771927a62fd | 2751 | } |
embeddedartists | 0:a771927a62fd | 2752 | |
embeddedartists | 0:a771927a62fd | 2753 | /******************************************************************************/ |
embeddedartists | 0:a771927a62fd | 2754 | |
embeddedartists | 0:a771927a62fd | 2755 | static void LodePNGIText_init(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2756 | { |
embeddedartists | 0:a771927a62fd | 2757 | info->itext_num = 0; |
embeddedartists | 0:a771927a62fd | 2758 | info->itext_keys = NULL; |
embeddedartists | 0:a771927a62fd | 2759 | info->itext_langtags = NULL; |
embeddedartists | 0:a771927a62fd | 2760 | info->itext_transkeys = NULL; |
embeddedartists | 0:a771927a62fd | 2761 | info->itext_strings = NULL; |
embeddedartists | 0:a771927a62fd | 2762 | } |
embeddedartists | 0:a771927a62fd | 2763 | |
embeddedartists | 0:a771927a62fd | 2764 | static void LodePNGIText_cleanup(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2765 | { |
embeddedartists | 0:a771927a62fd | 2766 | size_t i; |
embeddedartists | 0:a771927a62fd | 2767 | for(i = 0; i < info->itext_num; i++) |
embeddedartists | 0:a771927a62fd | 2768 | { |
embeddedartists | 0:a771927a62fd | 2769 | string_cleanup(&info->itext_keys[i]); |
embeddedartists | 0:a771927a62fd | 2770 | string_cleanup(&info->itext_langtags[i]); |
embeddedartists | 0:a771927a62fd | 2771 | string_cleanup(&info->itext_transkeys[i]); |
embeddedartists | 0:a771927a62fd | 2772 | string_cleanup(&info->itext_strings[i]); |
embeddedartists | 0:a771927a62fd | 2773 | } |
embeddedartists | 0:a771927a62fd | 2774 | lodepng_free(info->itext_keys); |
embeddedartists | 0:a771927a62fd | 2775 | lodepng_free(info->itext_langtags); |
embeddedartists | 0:a771927a62fd | 2776 | lodepng_free(info->itext_transkeys); |
embeddedartists | 0:a771927a62fd | 2777 | lodepng_free(info->itext_strings); |
embeddedartists | 0:a771927a62fd | 2778 | } |
embeddedartists | 0:a771927a62fd | 2779 | |
embeddedartists | 0:a771927a62fd | 2780 | static unsigned LodePNGIText_copy(LodePNGInfo* dest, const LodePNGInfo* source) |
embeddedartists | 0:a771927a62fd | 2781 | { |
embeddedartists | 0:a771927a62fd | 2782 | size_t i = 0; |
embeddedartists | 0:a771927a62fd | 2783 | dest->itext_keys = 0; |
embeddedartists | 0:a771927a62fd | 2784 | dest->itext_langtags = 0; |
embeddedartists | 0:a771927a62fd | 2785 | dest->itext_transkeys = 0; |
embeddedartists | 0:a771927a62fd | 2786 | dest->itext_strings = 0; |
embeddedartists | 0:a771927a62fd | 2787 | dest->itext_num = 0; |
embeddedartists | 0:a771927a62fd | 2788 | for(i = 0; i < source->itext_num; i++) |
embeddedartists | 0:a771927a62fd | 2789 | { |
embeddedartists | 0:a771927a62fd | 2790 | CERROR_TRY_RETURN(lodepng_add_itext(dest, source->itext_keys[i], source->itext_langtags[i], |
embeddedartists | 0:a771927a62fd | 2791 | source->itext_transkeys[i], source->itext_strings[i])); |
embeddedartists | 0:a771927a62fd | 2792 | } |
embeddedartists | 0:a771927a62fd | 2793 | return 0; |
embeddedartists | 0:a771927a62fd | 2794 | } |
embeddedartists | 0:a771927a62fd | 2795 | |
embeddedartists | 0:a771927a62fd | 2796 | void lodepng_clear_itext(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2797 | { |
embeddedartists | 0:a771927a62fd | 2798 | LodePNGIText_cleanup(info); |
embeddedartists | 0:a771927a62fd | 2799 | } |
embeddedartists | 0:a771927a62fd | 2800 | |
embeddedartists | 0:a771927a62fd | 2801 | unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag, |
embeddedartists | 0:a771927a62fd | 2802 | const char* transkey, const char* str) |
embeddedartists | 0:a771927a62fd | 2803 | { |
embeddedartists | 0:a771927a62fd | 2804 | char** new_keys = (char**)(lodepng_realloc(info->itext_keys, sizeof(char*) * (info->itext_num + 1))); |
embeddedartists | 0:a771927a62fd | 2805 | char** new_langtags = (char**)(lodepng_realloc(info->itext_langtags, sizeof(char*) * (info->itext_num + 1))); |
embeddedartists | 0:a771927a62fd | 2806 | char** new_transkeys = (char**)(lodepng_realloc(info->itext_transkeys, sizeof(char*) * (info->itext_num + 1))); |
embeddedartists | 0:a771927a62fd | 2807 | char** new_strings = (char**)(lodepng_realloc(info->itext_strings, sizeof(char*) * (info->itext_num + 1))); |
embeddedartists | 0:a771927a62fd | 2808 | if(!new_keys || !new_langtags || !new_transkeys || !new_strings) |
embeddedartists | 0:a771927a62fd | 2809 | { |
embeddedartists | 0:a771927a62fd | 2810 | lodepng_free(new_keys); |
embeddedartists | 0:a771927a62fd | 2811 | lodepng_free(new_langtags); |
embeddedartists | 0:a771927a62fd | 2812 | lodepng_free(new_transkeys); |
embeddedartists | 0:a771927a62fd | 2813 | lodepng_free(new_strings); |
embeddedartists | 0:a771927a62fd | 2814 | return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 2815 | } |
embeddedartists | 0:a771927a62fd | 2816 | |
embeddedartists | 0:a771927a62fd | 2817 | info->itext_num++; |
embeddedartists | 0:a771927a62fd | 2818 | info->itext_keys = new_keys; |
embeddedartists | 0:a771927a62fd | 2819 | info->itext_langtags = new_langtags; |
embeddedartists | 0:a771927a62fd | 2820 | info->itext_transkeys = new_transkeys; |
embeddedartists | 0:a771927a62fd | 2821 | info->itext_strings = new_strings; |
embeddedartists | 0:a771927a62fd | 2822 | |
embeddedartists | 0:a771927a62fd | 2823 | string_init(&info->itext_keys[info->itext_num - 1]); |
embeddedartists | 0:a771927a62fd | 2824 | string_set(&info->itext_keys[info->itext_num - 1], key); |
embeddedartists | 0:a771927a62fd | 2825 | |
embeddedartists | 0:a771927a62fd | 2826 | string_init(&info->itext_langtags[info->itext_num - 1]); |
embeddedartists | 0:a771927a62fd | 2827 | string_set(&info->itext_langtags[info->itext_num - 1], langtag); |
embeddedartists | 0:a771927a62fd | 2828 | |
embeddedartists | 0:a771927a62fd | 2829 | string_init(&info->itext_transkeys[info->itext_num - 1]); |
embeddedartists | 0:a771927a62fd | 2830 | string_set(&info->itext_transkeys[info->itext_num - 1], transkey); |
embeddedartists | 0:a771927a62fd | 2831 | |
embeddedartists | 0:a771927a62fd | 2832 | string_init(&info->itext_strings[info->itext_num - 1]); |
embeddedartists | 0:a771927a62fd | 2833 | string_set(&info->itext_strings[info->itext_num - 1], str); |
embeddedartists | 0:a771927a62fd | 2834 | |
embeddedartists | 0:a771927a62fd | 2835 | return 0; |
embeddedartists | 0:a771927a62fd | 2836 | } |
embeddedartists | 0:a771927a62fd | 2837 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 2838 | |
embeddedartists | 0:a771927a62fd | 2839 | void lodepng_info_init(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2840 | { |
embeddedartists | 0:a771927a62fd | 2841 | lodepng_color_mode_init(&info->color); |
embeddedartists | 0:a771927a62fd | 2842 | info->interlace_method = 0; |
embeddedartists | 0:a771927a62fd | 2843 | info->compression_method = 0; |
embeddedartists | 0:a771927a62fd | 2844 | info->filter_method = 0; |
embeddedartists | 0:a771927a62fd | 2845 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 2846 | info->background_defined = 0; |
embeddedartists | 0:a771927a62fd | 2847 | info->background_r = info->background_g = info->background_b = 0; |
embeddedartists | 0:a771927a62fd | 2848 | |
embeddedartists | 0:a771927a62fd | 2849 | LodePNGText_init(info); |
embeddedartists | 0:a771927a62fd | 2850 | LodePNGIText_init(info); |
embeddedartists | 0:a771927a62fd | 2851 | |
embeddedartists | 0:a771927a62fd | 2852 | info->time_defined = 0; |
embeddedartists | 0:a771927a62fd | 2853 | info->phys_defined = 0; |
embeddedartists | 0:a771927a62fd | 2854 | |
embeddedartists | 0:a771927a62fd | 2855 | LodePNGUnknownChunks_init(info); |
embeddedartists | 0:a771927a62fd | 2856 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 2857 | } |
embeddedartists | 0:a771927a62fd | 2858 | |
embeddedartists | 0:a771927a62fd | 2859 | void lodepng_info_cleanup(LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 2860 | { |
embeddedartists | 0:a771927a62fd | 2861 | lodepng_color_mode_cleanup(&info->color); |
embeddedartists | 0:a771927a62fd | 2862 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 2863 | LodePNGText_cleanup(info); |
embeddedartists | 0:a771927a62fd | 2864 | LodePNGIText_cleanup(info); |
embeddedartists | 0:a771927a62fd | 2865 | |
embeddedartists | 0:a771927a62fd | 2866 | LodePNGUnknownChunks_cleanup(info); |
embeddedartists | 0:a771927a62fd | 2867 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 2868 | } |
embeddedartists | 0:a771927a62fd | 2869 | |
embeddedartists | 0:a771927a62fd | 2870 | unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source) |
embeddedartists | 0:a771927a62fd | 2871 | { |
embeddedartists | 0:a771927a62fd | 2872 | lodepng_info_cleanup(dest); |
embeddedartists | 0:a771927a62fd | 2873 | *dest = *source; |
embeddedartists | 0:a771927a62fd | 2874 | lodepng_color_mode_init(&dest->color); |
embeddedartists | 0:a771927a62fd | 2875 | CERROR_TRY_RETURN(lodepng_color_mode_copy(&dest->color, &source->color)); |
embeddedartists | 0:a771927a62fd | 2876 | |
embeddedartists | 0:a771927a62fd | 2877 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 2878 | CERROR_TRY_RETURN(LodePNGText_copy(dest, source)); |
embeddedartists | 0:a771927a62fd | 2879 | CERROR_TRY_RETURN(LodePNGIText_copy(dest, source)); |
embeddedartists | 0:a771927a62fd | 2880 | |
embeddedartists | 0:a771927a62fd | 2881 | LodePNGUnknownChunks_init(dest); |
embeddedartists | 0:a771927a62fd | 2882 | CERROR_TRY_RETURN(LodePNGUnknownChunks_copy(dest, source)); |
embeddedartists | 0:a771927a62fd | 2883 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 2884 | return 0; |
embeddedartists | 0:a771927a62fd | 2885 | } |
embeddedartists | 0:a771927a62fd | 2886 | |
embeddedartists | 0:a771927a62fd | 2887 | void lodepng_info_swap(LodePNGInfo* a, LodePNGInfo* b) |
embeddedartists | 0:a771927a62fd | 2888 | { |
embeddedartists | 0:a771927a62fd | 2889 | LodePNGInfo temp = *a; |
embeddedartists | 0:a771927a62fd | 2890 | *a = *b; |
embeddedartists | 0:a771927a62fd | 2891 | *b = temp; |
embeddedartists | 0:a771927a62fd | 2892 | } |
embeddedartists | 0:a771927a62fd | 2893 | |
embeddedartists | 0:a771927a62fd | 2894 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 2895 | |
embeddedartists | 0:a771927a62fd | 2896 | /*index: bitgroup index, bits: bitgroup size(1, 2 or 4), in: bitgroup value, out: octet array to add bits to*/ |
embeddedartists | 0:a771927a62fd | 2897 | static void addColorBits(unsigned char* out, size_t index, unsigned bits, unsigned in) |
embeddedartists | 0:a771927a62fd | 2898 | { |
embeddedartists | 0:a771927a62fd | 2899 | unsigned m = bits == 1 ? 7 : bits == 2 ? 3 : 1; /*8 / bits - 1*/ |
embeddedartists | 0:a771927a62fd | 2900 | /*p = the partial index in the byte, e.g. with 4 palettebits it is 0 for first half or 1 for second half*/ |
embeddedartists | 0:a771927a62fd | 2901 | unsigned p = index & m; |
embeddedartists | 0:a771927a62fd | 2902 | in &= (1 << bits) - 1; /*filter out any other bits of the input value*/ |
embeddedartists | 0:a771927a62fd | 2903 | in = in << (bits * (m - p)); |
embeddedartists | 0:a771927a62fd | 2904 | if(p == 0) out[index * bits / 8] = in; |
embeddedartists | 0:a771927a62fd | 2905 | else out[index * bits / 8] |= in; |
embeddedartists | 0:a771927a62fd | 2906 | } |
embeddedartists | 0:a771927a62fd | 2907 | |
embeddedartists | 0:a771927a62fd | 2908 | typedef struct ColorTree ColorTree; |
embeddedartists | 0:a771927a62fd | 2909 | |
embeddedartists | 0:a771927a62fd | 2910 | /* |
embeddedartists | 0:a771927a62fd | 2911 | One node of a color tree |
embeddedartists | 0:a771927a62fd | 2912 | This is the data structure used to count the number of unique colors and to get a palette |
embeddedartists | 0:a771927a62fd | 2913 | index for a color. It's like an octree, but because the alpha channel is used too, each |
embeddedartists | 0:a771927a62fd | 2914 | node has 16 instead of 8 children. |
embeddedartists | 0:a771927a62fd | 2915 | */ |
embeddedartists | 0:a771927a62fd | 2916 | struct ColorTree |
embeddedartists | 0:a771927a62fd | 2917 | { |
embeddedartists | 0:a771927a62fd | 2918 | ColorTree* children[16]; /*up to 16 pointers to ColorTree of next level*/ |
embeddedartists | 0:a771927a62fd | 2919 | int index; /*the payload. Only has a meaningful value if this is in the last level*/ |
embeddedartists | 0:a771927a62fd | 2920 | }; |
embeddedartists | 0:a771927a62fd | 2921 | |
embeddedartists | 0:a771927a62fd | 2922 | static void color_tree_init(ColorTree* tree) |
embeddedartists | 0:a771927a62fd | 2923 | { |
embeddedartists | 0:a771927a62fd | 2924 | int i; |
embeddedartists | 0:a771927a62fd | 2925 | for(i = 0; i < 16; i++) tree->children[i] = 0; |
embeddedartists | 0:a771927a62fd | 2926 | tree->index = -1; |
embeddedartists | 0:a771927a62fd | 2927 | } |
embeddedartists | 0:a771927a62fd | 2928 | |
embeddedartists | 0:a771927a62fd | 2929 | static void color_tree_cleanup(ColorTree* tree) |
embeddedartists | 0:a771927a62fd | 2930 | { |
embeddedartists | 0:a771927a62fd | 2931 | int i; |
embeddedartists | 0:a771927a62fd | 2932 | for(i = 0; i < 16; i++) |
embeddedartists | 0:a771927a62fd | 2933 | { |
embeddedartists | 0:a771927a62fd | 2934 | if(tree->children[i]) |
embeddedartists | 0:a771927a62fd | 2935 | { |
embeddedartists | 0:a771927a62fd | 2936 | color_tree_cleanup(tree->children[i]); |
embeddedartists | 0:a771927a62fd | 2937 | lodepng_free(tree->children[i]); |
embeddedartists | 0:a771927a62fd | 2938 | } |
embeddedartists | 0:a771927a62fd | 2939 | } |
embeddedartists | 0:a771927a62fd | 2940 | } |
embeddedartists | 0:a771927a62fd | 2941 | |
embeddedartists | 0:a771927a62fd | 2942 | /*returns -1 if color not present, its index otherwise*/ |
embeddedartists | 0:a771927a62fd | 2943 | static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) |
embeddedartists | 0:a771927a62fd | 2944 | { |
embeddedartists | 0:a771927a62fd | 2945 | int bit = 0; |
embeddedartists | 0:a771927a62fd | 2946 | for(bit = 0; bit < 8; bit++) |
embeddedartists | 0:a771927a62fd | 2947 | { |
embeddedartists | 0:a771927a62fd | 2948 | int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1); |
embeddedartists | 0:a771927a62fd | 2949 | if(!tree->children[i]) return -1; |
embeddedartists | 0:a771927a62fd | 2950 | else tree = tree->children[i]; |
embeddedartists | 0:a771927a62fd | 2951 | } |
embeddedartists | 0:a771927a62fd | 2952 | return tree ? tree->index : -1; |
embeddedartists | 0:a771927a62fd | 2953 | } |
embeddedartists | 0:a771927a62fd | 2954 | |
embeddedartists | 0:a771927a62fd | 2955 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 2956 | static int color_tree_has(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) |
embeddedartists | 0:a771927a62fd | 2957 | { |
embeddedartists | 0:a771927a62fd | 2958 | return color_tree_get(tree, r, g, b, a) >= 0; |
embeddedartists | 0:a771927a62fd | 2959 | } |
embeddedartists | 0:a771927a62fd | 2960 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 2961 | |
embeddedartists | 0:a771927a62fd | 2962 | /*color is not allowed to already exist. |
embeddedartists | 0:a771927a62fd | 2963 | Index should be >= 0 (it's signed to be compatible with using -1 for "doesn't exist")*/ |
embeddedartists | 0:a771927a62fd | 2964 | static void color_tree_add(ColorTree* tree, |
embeddedartists | 0:a771927a62fd | 2965 | unsigned char r, unsigned char g, unsigned char b, unsigned char a, int index) |
embeddedartists | 0:a771927a62fd | 2966 | { |
embeddedartists | 0:a771927a62fd | 2967 | int bit; |
embeddedartists | 0:a771927a62fd | 2968 | for(bit = 0; bit < 8; bit++) |
embeddedartists | 0:a771927a62fd | 2969 | { |
embeddedartists | 0:a771927a62fd | 2970 | int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1); |
embeddedartists | 0:a771927a62fd | 2971 | if(!tree->children[i]) |
embeddedartists | 0:a771927a62fd | 2972 | { |
embeddedartists | 0:a771927a62fd | 2973 | tree->children[i] = (ColorTree*)lodepng_malloc(sizeof(ColorTree)); |
embeddedartists | 0:a771927a62fd | 2974 | color_tree_init(tree->children[i]); |
embeddedartists | 0:a771927a62fd | 2975 | } |
embeddedartists | 0:a771927a62fd | 2976 | tree = tree->children[i]; |
embeddedartists | 0:a771927a62fd | 2977 | } |
embeddedartists | 0:a771927a62fd | 2978 | tree->index = index; |
embeddedartists | 0:a771927a62fd | 2979 | } |
embeddedartists | 0:a771927a62fd | 2980 | |
embeddedartists | 0:a771927a62fd | 2981 | /*put a pixel, given its RGBA color, into image of any color type*/ |
embeddedartists | 0:a771927a62fd | 2982 | static unsigned rgba8ToPixel(unsigned char* out, size_t i, |
embeddedartists | 0:a771927a62fd | 2983 | const LodePNGColorMode* mode, ColorTree* tree /*for palette*/, |
embeddedartists | 0:a771927a62fd | 2984 | unsigned char r, unsigned char g, unsigned char b, unsigned char a) |
embeddedartists | 0:a771927a62fd | 2985 | { |
embeddedartists | 0:a771927a62fd | 2986 | if(mode->colortype == LCT_GREY) |
embeddedartists | 0:a771927a62fd | 2987 | { |
embeddedartists | 0:a771927a62fd | 2988 | unsigned char grey = r; /*((unsigned short)r + g + b) / 3*/; |
embeddedartists | 0:a771927a62fd | 2989 | if(mode->bitdepth == 8) out[i] = grey; |
embeddedartists | 0:a771927a62fd | 2990 | else if(mode->bitdepth == 16) out[i * 2 + 0] = out[i * 2 + 1] = grey; |
embeddedartists | 0:a771927a62fd | 2991 | else |
embeddedartists | 0:a771927a62fd | 2992 | { |
embeddedartists | 0:a771927a62fd | 2993 | /*take the most significant bits of grey*/ |
embeddedartists | 0:a771927a62fd | 2994 | grey = (grey >> (8 - mode->bitdepth)) & ((1 << mode->bitdepth) - 1); |
embeddedartists | 0:a771927a62fd | 2995 | addColorBits(out, i, mode->bitdepth, grey); |
embeddedartists | 0:a771927a62fd | 2996 | } |
embeddedartists | 0:a771927a62fd | 2997 | } |
embeddedartists | 0:a771927a62fd | 2998 | else if(mode->colortype == LCT_RGB) |
embeddedartists | 0:a771927a62fd | 2999 | { |
embeddedartists | 0:a771927a62fd | 3000 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3001 | { |
embeddedartists | 0:a771927a62fd | 3002 | out[i * 3 + 0] = r; |
embeddedartists | 0:a771927a62fd | 3003 | out[i * 3 + 1] = g; |
embeddedartists | 0:a771927a62fd | 3004 | out[i * 3 + 2] = b; |
embeddedartists | 0:a771927a62fd | 3005 | } |
embeddedartists | 0:a771927a62fd | 3006 | else |
embeddedartists | 0:a771927a62fd | 3007 | { |
embeddedartists | 0:a771927a62fd | 3008 | out[i * 6 + 0] = out[i * 6 + 1] = r; |
embeddedartists | 0:a771927a62fd | 3009 | out[i * 6 + 2] = out[i * 6 + 3] = g; |
embeddedartists | 0:a771927a62fd | 3010 | out[i * 6 + 4] = out[i * 6 + 5] = b; |
embeddedartists | 0:a771927a62fd | 3011 | } |
embeddedartists | 0:a771927a62fd | 3012 | } |
embeddedartists | 0:a771927a62fd | 3013 | else if(mode->colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 3014 | { |
embeddedartists | 0:a771927a62fd | 3015 | int index = color_tree_get(tree, r, g, b, a); |
embeddedartists | 0:a771927a62fd | 3016 | if(index < 0) return 82; /*color not in palette*/ |
embeddedartists | 0:a771927a62fd | 3017 | if(mode->bitdepth == 8) out[i] = index; |
embeddedartists | 0:a771927a62fd | 3018 | else addColorBits(out, i, mode->bitdepth, index); |
embeddedartists | 0:a771927a62fd | 3019 | } |
embeddedartists | 0:a771927a62fd | 3020 | else if(mode->colortype == LCT_GREY_ALPHA) |
embeddedartists | 0:a771927a62fd | 3021 | { |
embeddedartists | 0:a771927a62fd | 3022 | unsigned char grey = r; /*((unsigned short)r + g + b) / 3*/; |
embeddedartists | 0:a771927a62fd | 3023 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3024 | { |
embeddedartists | 0:a771927a62fd | 3025 | out[i * 2 + 0] = grey; |
embeddedartists | 0:a771927a62fd | 3026 | out[i * 2 + 1] = a; |
embeddedartists | 0:a771927a62fd | 3027 | } |
embeddedartists | 0:a771927a62fd | 3028 | else if(mode->bitdepth == 16) |
embeddedartists | 0:a771927a62fd | 3029 | { |
embeddedartists | 0:a771927a62fd | 3030 | out[i * 4 + 0] = out[i * 4 + 1] = grey; |
embeddedartists | 0:a771927a62fd | 3031 | out[i * 4 + 2] = out[i * 4 + 3] = a; |
embeddedartists | 0:a771927a62fd | 3032 | } |
embeddedartists | 0:a771927a62fd | 3033 | } |
embeddedartists | 0:a771927a62fd | 3034 | else if(mode->colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 3035 | { |
embeddedartists | 0:a771927a62fd | 3036 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3037 | { |
embeddedartists | 0:a771927a62fd | 3038 | out[i * 4 + 0] = r; |
embeddedartists | 0:a771927a62fd | 3039 | out[i * 4 + 1] = g; |
embeddedartists | 0:a771927a62fd | 3040 | out[i * 4 + 2] = b; |
embeddedartists | 0:a771927a62fd | 3041 | out[i * 4 + 3] = a; |
embeddedartists | 0:a771927a62fd | 3042 | } |
embeddedartists | 0:a771927a62fd | 3043 | else |
embeddedartists | 0:a771927a62fd | 3044 | { |
embeddedartists | 0:a771927a62fd | 3045 | out[i * 8 + 0] = out[i * 8 + 1] = r; |
embeddedartists | 0:a771927a62fd | 3046 | out[i * 8 + 2] = out[i * 8 + 3] = g; |
embeddedartists | 0:a771927a62fd | 3047 | out[i * 8 + 4] = out[i * 8 + 5] = b; |
embeddedartists | 0:a771927a62fd | 3048 | out[i * 8 + 6] = out[i * 8 + 7] = a; |
embeddedartists | 0:a771927a62fd | 3049 | } |
embeddedartists | 0:a771927a62fd | 3050 | } |
embeddedartists | 0:a771927a62fd | 3051 | |
embeddedartists | 0:a771927a62fd | 3052 | return 0; /*no error*/ |
embeddedartists | 0:a771927a62fd | 3053 | } |
embeddedartists | 0:a771927a62fd | 3054 | |
embeddedartists | 0:a771927a62fd | 3055 | /*put a pixel, given its RGBA16 color, into image of any color 16-bitdepth type*/ |
embeddedartists | 0:a771927a62fd | 3056 | static unsigned rgba16ToPixel(unsigned char* out, size_t i, |
embeddedartists | 0:a771927a62fd | 3057 | const LodePNGColorMode* mode, |
embeddedartists | 0:a771927a62fd | 3058 | unsigned short r, unsigned short g, unsigned short b, unsigned short a) |
embeddedartists | 0:a771927a62fd | 3059 | { |
embeddedartists | 0:a771927a62fd | 3060 | if(mode->bitdepth != 16) return 85; /*must be 16 for this function*/ |
embeddedartists | 0:a771927a62fd | 3061 | if(mode->colortype == LCT_GREY) |
embeddedartists | 0:a771927a62fd | 3062 | { |
embeddedartists | 0:a771927a62fd | 3063 | unsigned short grey = r; /*((unsigned)r + g + b) / 3*/; |
embeddedartists | 0:a771927a62fd | 3064 | out[i * 2 + 0] = (grey >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3065 | out[i * 2 + 1] = grey & 255; |
embeddedartists | 0:a771927a62fd | 3066 | } |
embeddedartists | 0:a771927a62fd | 3067 | else if(mode->colortype == LCT_RGB) |
embeddedartists | 0:a771927a62fd | 3068 | { |
embeddedartists | 0:a771927a62fd | 3069 | out[i * 6 + 0] = (r >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3070 | out[i * 6 + 1] = r & 255; |
embeddedartists | 0:a771927a62fd | 3071 | out[i * 6 + 2] = (g >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3072 | out[i * 6 + 3] = g & 255; |
embeddedartists | 0:a771927a62fd | 3073 | out[i * 6 + 4] = (b >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3074 | out[i * 6 + 5] = b & 255; |
embeddedartists | 0:a771927a62fd | 3075 | } |
embeddedartists | 0:a771927a62fd | 3076 | else if(mode->colortype == LCT_GREY_ALPHA) |
embeddedartists | 0:a771927a62fd | 3077 | { |
embeddedartists | 0:a771927a62fd | 3078 | unsigned short grey = r; /*((unsigned)r + g + b) / 3*/; |
embeddedartists | 0:a771927a62fd | 3079 | out[i * 4 + 0] = (grey >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3080 | out[i * 4 + 1] = grey & 255; |
embeddedartists | 0:a771927a62fd | 3081 | out[i * 4 + 2] = (a >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3082 | out[i * 4 + 3] = a & 255; |
embeddedartists | 0:a771927a62fd | 3083 | } |
embeddedartists | 0:a771927a62fd | 3084 | else if(mode->colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 3085 | { |
embeddedartists | 0:a771927a62fd | 3086 | out[i * 8 + 0] = (r >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3087 | out[i * 8 + 1] = r & 255; |
embeddedartists | 0:a771927a62fd | 3088 | out[i * 8 + 2] = (g >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3089 | out[i * 8 + 3] = g & 255; |
embeddedartists | 0:a771927a62fd | 3090 | out[i * 8 + 4] = (b >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3091 | out[i * 8 + 5] = b & 255; |
embeddedartists | 0:a771927a62fd | 3092 | out[i * 8 + 6] = (a >> 8) & 255; |
embeddedartists | 0:a771927a62fd | 3093 | out[i * 8 + 7] = a & 255; |
embeddedartists | 0:a771927a62fd | 3094 | } |
embeddedartists | 0:a771927a62fd | 3095 | |
embeddedartists | 0:a771927a62fd | 3096 | return 0; /*no error*/ |
embeddedartists | 0:a771927a62fd | 3097 | } |
embeddedartists | 0:a771927a62fd | 3098 | |
embeddedartists | 0:a771927a62fd | 3099 | /*Get RGBA8 color of pixel with index i (y * width + x) from the raw image with given color type.*/ |
embeddedartists | 0:a771927a62fd | 3100 | static unsigned getPixelColorRGBA8(unsigned char* r, unsigned char* g, |
embeddedartists | 0:a771927a62fd | 3101 | unsigned char* b, unsigned char* a, |
embeddedartists | 0:a771927a62fd | 3102 | const unsigned char* in, size_t i, |
embeddedartists | 0:a771927a62fd | 3103 | const LodePNGColorMode* mode, |
embeddedartists | 0:a771927a62fd | 3104 | unsigned fix_png) |
embeddedartists | 0:a771927a62fd | 3105 | { |
embeddedartists | 0:a771927a62fd | 3106 | if(mode->colortype == LCT_GREY) |
embeddedartists | 0:a771927a62fd | 3107 | { |
embeddedartists | 0:a771927a62fd | 3108 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3109 | { |
embeddedartists | 0:a771927a62fd | 3110 | *r = *g = *b = in[i]; |
embeddedartists | 0:a771927a62fd | 3111 | if(mode->key_defined && *r == mode->key_r) *a = 0; |
embeddedartists | 0:a771927a62fd | 3112 | else *a = 255; |
embeddedartists | 0:a771927a62fd | 3113 | } |
embeddedartists | 0:a771927a62fd | 3114 | else if(mode->bitdepth == 16) |
embeddedartists | 0:a771927a62fd | 3115 | { |
embeddedartists | 0:a771927a62fd | 3116 | *r = *g = *b = in[i * 2 + 0]; |
embeddedartists | 0:a771927a62fd | 3117 | if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0; |
embeddedartists | 0:a771927a62fd | 3118 | else *a = 255; |
embeddedartists | 0:a771927a62fd | 3119 | } |
embeddedartists | 0:a771927a62fd | 3120 | else |
embeddedartists | 0:a771927a62fd | 3121 | { |
embeddedartists | 0:a771927a62fd | 3122 | unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/ |
embeddedartists | 0:a771927a62fd | 3123 | size_t j = i * mode->bitdepth; |
embeddedartists | 0:a771927a62fd | 3124 | unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); |
embeddedartists | 0:a771927a62fd | 3125 | *r = *g = *b = (value * 255) / highest; |
embeddedartists | 0:a771927a62fd | 3126 | if(mode->key_defined && value == mode->key_r) *a = 0; |
embeddedartists | 0:a771927a62fd | 3127 | else *a = 255; |
embeddedartists | 0:a771927a62fd | 3128 | } |
embeddedartists | 0:a771927a62fd | 3129 | } |
embeddedartists | 0:a771927a62fd | 3130 | else if(mode->colortype == LCT_RGB) |
embeddedartists | 0:a771927a62fd | 3131 | { |
embeddedartists | 0:a771927a62fd | 3132 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3133 | { |
embeddedartists | 0:a771927a62fd | 3134 | *r = in[i * 3 + 0]; *g = in[i * 3 + 1]; *b = in[i * 3 + 2]; |
embeddedartists | 0:a771927a62fd | 3135 | if(mode->key_defined && *r == mode->key_r && *g == mode->key_g && *b == mode->key_b) *a = 0; |
embeddedartists | 0:a771927a62fd | 3136 | else *a = 255; |
embeddedartists | 0:a771927a62fd | 3137 | } |
embeddedartists | 0:a771927a62fd | 3138 | else |
embeddedartists | 0:a771927a62fd | 3139 | { |
embeddedartists | 0:a771927a62fd | 3140 | *r = in[i * 6 + 0]; |
embeddedartists | 0:a771927a62fd | 3141 | *g = in[i * 6 + 2]; |
embeddedartists | 0:a771927a62fd | 3142 | *b = in[i * 6 + 4]; |
embeddedartists | 0:a771927a62fd | 3143 | if(mode->key_defined && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r |
embeddedartists | 0:a771927a62fd | 3144 | && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g |
embeddedartists | 0:a771927a62fd | 3145 | && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0; |
embeddedartists | 0:a771927a62fd | 3146 | else *a = 255; |
embeddedartists | 0:a771927a62fd | 3147 | } |
embeddedartists | 0:a771927a62fd | 3148 | } |
embeddedartists | 0:a771927a62fd | 3149 | else if(mode->colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 3150 | { |
embeddedartists | 0:a771927a62fd | 3151 | unsigned index; |
embeddedartists | 0:a771927a62fd | 3152 | if(mode->bitdepth == 8) index = in[i]; |
embeddedartists | 0:a771927a62fd | 3153 | else |
embeddedartists | 0:a771927a62fd | 3154 | { |
embeddedartists | 0:a771927a62fd | 3155 | size_t j = i * mode->bitdepth; |
embeddedartists | 0:a771927a62fd | 3156 | index = readBitsFromReversedStream(&j, in, mode->bitdepth); |
embeddedartists | 0:a771927a62fd | 3157 | } |
embeddedartists | 0:a771927a62fd | 3158 | |
embeddedartists | 0:a771927a62fd | 3159 | if(index >= mode->palettesize) |
embeddedartists | 0:a771927a62fd | 3160 | { |
embeddedartists | 0:a771927a62fd | 3161 | /*This is an error according to the PNG spec, but fix_png can ignore it*/ |
embeddedartists | 0:a771927a62fd | 3162 | if(!fix_png) return (mode->bitdepth == 8 ? 46 : 47); /*index out of palette*/ |
embeddedartists | 0:a771927a62fd | 3163 | *r = *g = *b = 0; |
embeddedartists | 0:a771927a62fd | 3164 | *a = 255; |
embeddedartists | 0:a771927a62fd | 3165 | } |
embeddedartists | 0:a771927a62fd | 3166 | else |
embeddedartists | 0:a771927a62fd | 3167 | { |
embeddedartists | 0:a771927a62fd | 3168 | *r = mode->palette[index * 4 + 0]; |
embeddedartists | 0:a771927a62fd | 3169 | *g = mode->palette[index * 4 + 1]; |
embeddedartists | 0:a771927a62fd | 3170 | *b = mode->palette[index * 4 + 2]; |
embeddedartists | 0:a771927a62fd | 3171 | *a = mode->palette[index * 4 + 3]; |
embeddedartists | 0:a771927a62fd | 3172 | } |
embeddedartists | 0:a771927a62fd | 3173 | } |
embeddedartists | 0:a771927a62fd | 3174 | else if(mode->colortype == LCT_GREY_ALPHA) |
embeddedartists | 0:a771927a62fd | 3175 | { |
embeddedartists | 0:a771927a62fd | 3176 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3177 | { |
embeddedartists | 0:a771927a62fd | 3178 | *r = *g = *b = in[i * 2 + 0]; |
embeddedartists | 0:a771927a62fd | 3179 | *a = in[i * 2 + 1]; |
embeddedartists | 0:a771927a62fd | 3180 | } |
embeddedartists | 0:a771927a62fd | 3181 | else |
embeddedartists | 0:a771927a62fd | 3182 | { |
embeddedartists | 0:a771927a62fd | 3183 | *r = *g = *b = in[i * 4 + 0]; |
embeddedartists | 0:a771927a62fd | 3184 | *a = in[i * 4 + 2]; |
embeddedartists | 0:a771927a62fd | 3185 | } |
embeddedartists | 0:a771927a62fd | 3186 | } |
embeddedartists | 0:a771927a62fd | 3187 | else if(mode->colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 3188 | { |
embeddedartists | 0:a771927a62fd | 3189 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3190 | { |
embeddedartists | 0:a771927a62fd | 3191 | *r = in[i * 4 + 0]; |
embeddedartists | 0:a771927a62fd | 3192 | *g = in[i * 4 + 1]; |
embeddedartists | 0:a771927a62fd | 3193 | *b = in[i * 4 + 2]; |
embeddedartists | 0:a771927a62fd | 3194 | *a = in[i * 4 + 3]; |
embeddedartists | 0:a771927a62fd | 3195 | } |
embeddedartists | 0:a771927a62fd | 3196 | else |
embeddedartists | 0:a771927a62fd | 3197 | { |
embeddedartists | 0:a771927a62fd | 3198 | *r = in[i * 8 + 0]; |
embeddedartists | 0:a771927a62fd | 3199 | *g = in[i * 8 + 2]; |
embeddedartists | 0:a771927a62fd | 3200 | *b = in[i * 8 + 4]; |
embeddedartists | 0:a771927a62fd | 3201 | *a = in[i * 8 + 6]; |
embeddedartists | 0:a771927a62fd | 3202 | } |
embeddedartists | 0:a771927a62fd | 3203 | } |
embeddedartists | 0:a771927a62fd | 3204 | |
embeddedartists | 0:a771927a62fd | 3205 | return 0; /*no error*/ |
embeddedartists | 0:a771927a62fd | 3206 | } |
embeddedartists | 0:a771927a62fd | 3207 | |
embeddedartists | 0:a771927a62fd | 3208 | /*Similar to getPixelColorRGBA8, but with all the for loops inside of the color |
embeddedartists | 0:a771927a62fd | 3209 | mode test cases, optimized to convert the colors much faster, when converting |
embeddedartists | 0:a771927a62fd | 3210 | to RGBA or RGB with 8 bit per cannel. buffer must be RGBA or RGB output with |
embeddedartists | 0:a771927a62fd | 3211 | enough memory, if has_alpha is true the output is RGBA. mode has the color mode |
embeddedartists | 0:a771927a62fd | 3212 | of the input buffer.*/ |
embeddedartists | 0:a771927a62fd | 3213 | static unsigned getPixelColorsRGBA8(unsigned char* buffer, size_t numpixels, |
embeddedartists | 0:a771927a62fd | 3214 | unsigned has_alpha, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 3215 | const LodePNGColorMode* mode, |
embeddedartists | 0:a771927a62fd | 3216 | unsigned fix_png) |
embeddedartists | 0:a771927a62fd | 3217 | { |
embeddedartists | 0:a771927a62fd | 3218 | unsigned num_channels = has_alpha ? 4 : 3; |
embeddedartists | 0:a771927a62fd | 3219 | size_t i; |
embeddedartists | 0:a771927a62fd | 3220 | if(mode->colortype == LCT_GREY) |
embeddedartists | 0:a771927a62fd | 3221 | { |
embeddedartists | 0:a771927a62fd | 3222 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3223 | { |
embeddedartists | 0:a771927a62fd | 3224 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3225 | { |
embeddedartists | 0:a771927a62fd | 3226 | buffer[0] = buffer[1] = buffer[2] = in[i]; |
embeddedartists | 0:a771927a62fd | 3227 | if(has_alpha) buffer[3] = mode->key_defined && in[i] == mode->key_r ? 0 : 255; |
embeddedartists | 0:a771927a62fd | 3228 | } |
embeddedartists | 0:a771927a62fd | 3229 | } |
embeddedartists | 0:a771927a62fd | 3230 | else if(mode->bitdepth == 16) |
embeddedartists | 0:a771927a62fd | 3231 | { |
embeddedartists | 0:a771927a62fd | 3232 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3233 | { |
embeddedartists | 0:a771927a62fd | 3234 | buffer[0] = buffer[1] = buffer[2] = in[i * 2]; |
embeddedartists | 0:a771927a62fd | 3235 | if(has_alpha) buffer[3] = mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r ? 0 : 255; |
embeddedartists | 0:a771927a62fd | 3236 | } |
embeddedartists | 0:a771927a62fd | 3237 | } |
embeddedartists | 0:a771927a62fd | 3238 | else |
embeddedartists | 0:a771927a62fd | 3239 | { |
embeddedartists | 0:a771927a62fd | 3240 | unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/ |
embeddedartists | 0:a771927a62fd | 3241 | size_t j = 0; |
embeddedartists | 0:a771927a62fd | 3242 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3243 | { |
embeddedartists | 0:a771927a62fd | 3244 | unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); |
embeddedartists | 0:a771927a62fd | 3245 | buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest; |
embeddedartists | 0:a771927a62fd | 3246 | if(has_alpha) buffer[3] = mode->key_defined && value == mode->key_r ? 0 : 255; |
embeddedartists | 0:a771927a62fd | 3247 | } |
embeddedartists | 0:a771927a62fd | 3248 | } |
embeddedartists | 0:a771927a62fd | 3249 | } |
embeddedartists | 0:a771927a62fd | 3250 | else if(mode->colortype == LCT_RGB) |
embeddedartists | 0:a771927a62fd | 3251 | { |
embeddedartists | 0:a771927a62fd | 3252 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3253 | { |
embeddedartists | 0:a771927a62fd | 3254 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3255 | { |
embeddedartists | 0:a771927a62fd | 3256 | buffer[0] = in[i * 3 + 0]; |
embeddedartists | 0:a771927a62fd | 3257 | buffer[1] = in[i * 3 + 1]; |
embeddedartists | 0:a771927a62fd | 3258 | buffer[2] = in[i * 3 + 2]; |
embeddedartists | 0:a771927a62fd | 3259 | if(has_alpha) buffer[3] = mode->key_defined && buffer[0] == mode->key_r |
embeddedartists | 0:a771927a62fd | 3260 | && buffer[1]== mode->key_g && buffer[2] == mode->key_b ? 0 : 255; |
embeddedartists | 0:a771927a62fd | 3261 | } |
embeddedartists | 0:a771927a62fd | 3262 | } |
embeddedartists | 0:a771927a62fd | 3263 | else |
embeddedartists | 0:a771927a62fd | 3264 | { |
embeddedartists | 0:a771927a62fd | 3265 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3266 | { |
embeddedartists | 0:a771927a62fd | 3267 | buffer[0] = in[i * 6 + 0]; |
embeddedartists | 0:a771927a62fd | 3268 | buffer[1] = in[i * 6 + 2]; |
embeddedartists | 0:a771927a62fd | 3269 | buffer[2] = in[i * 6 + 4]; |
embeddedartists | 0:a771927a62fd | 3270 | if(has_alpha) buffer[3] = mode->key_defined |
embeddedartists | 0:a771927a62fd | 3271 | && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r |
embeddedartists | 0:a771927a62fd | 3272 | && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g |
embeddedartists | 0:a771927a62fd | 3273 | && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b ? 0 : 255; |
embeddedartists | 0:a771927a62fd | 3274 | } |
embeddedartists | 0:a771927a62fd | 3275 | } |
embeddedartists | 0:a771927a62fd | 3276 | } |
embeddedartists | 0:a771927a62fd | 3277 | else if(mode->colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 3278 | { |
embeddedartists | 0:a771927a62fd | 3279 | unsigned index; |
embeddedartists | 0:a771927a62fd | 3280 | size_t j = 0; |
embeddedartists | 0:a771927a62fd | 3281 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3282 | { |
embeddedartists | 0:a771927a62fd | 3283 | if(mode->bitdepth == 8) index = in[i]; |
embeddedartists | 0:a771927a62fd | 3284 | else index = readBitsFromReversedStream(&j, in, mode->bitdepth); |
embeddedartists | 0:a771927a62fd | 3285 | |
embeddedartists | 0:a771927a62fd | 3286 | if(index >= mode->palettesize) |
embeddedartists | 0:a771927a62fd | 3287 | { |
embeddedartists | 0:a771927a62fd | 3288 | /*This is an error according to the PNG spec, but fix_png can ignore it*/ |
embeddedartists | 0:a771927a62fd | 3289 | if(!fix_png) return (mode->bitdepth == 8 ? 46 : 47); /*index out of palette*/ |
embeddedartists | 0:a771927a62fd | 3290 | buffer[0] = buffer[1] = buffer[2] = 0; |
embeddedartists | 0:a771927a62fd | 3291 | if(has_alpha) buffer[3] = 255; |
embeddedartists | 0:a771927a62fd | 3292 | } |
embeddedartists | 0:a771927a62fd | 3293 | else |
embeddedartists | 0:a771927a62fd | 3294 | { |
embeddedartists | 0:a771927a62fd | 3295 | buffer[0] = mode->palette[index * 4 + 0]; |
embeddedartists | 0:a771927a62fd | 3296 | buffer[1] = mode->palette[index * 4 + 1]; |
embeddedartists | 0:a771927a62fd | 3297 | buffer[2] = mode->palette[index * 4 + 2]; |
embeddedartists | 0:a771927a62fd | 3298 | if(has_alpha) buffer[3] = mode->palette[index * 4 + 3]; |
embeddedartists | 0:a771927a62fd | 3299 | } |
embeddedartists | 0:a771927a62fd | 3300 | } |
embeddedartists | 0:a771927a62fd | 3301 | } |
embeddedartists | 0:a771927a62fd | 3302 | else if(mode->colortype == LCT_GREY_ALPHA) |
embeddedartists | 0:a771927a62fd | 3303 | { |
embeddedartists | 0:a771927a62fd | 3304 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3305 | { |
embeddedartists | 0:a771927a62fd | 3306 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3307 | { |
embeddedartists | 0:a771927a62fd | 3308 | buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0]; |
embeddedartists | 0:a771927a62fd | 3309 | if(has_alpha) buffer[3] = in[i * 2 + 1]; |
embeddedartists | 0:a771927a62fd | 3310 | } |
embeddedartists | 0:a771927a62fd | 3311 | } |
embeddedartists | 0:a771927a62fd | 3312 | else |
embeddedartists | 0:a771927a62fd | 3313 | { |
embeddedartists | 0:a771927a62fd | 3314 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3315 | { |
embeddedartists | 0:a771927a62fd | 3316 | buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0]; |
embeddedartists | 0:a771927a62fd | 3317 | if(has_alpha) buffer[3] = in[i * 4 + 2]; |
embeddedartists | 0:a771927a62fd | 3318 | } |
embeddedartists | 0:a771927a62fd | 3319 | } |
embeddedartists | 0:a771927a62fd | 3320 | } |
embeddedartists | 0:a771927a62fd | 3321 | else if(mode->colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 3322 | { |
embeddedartists | 0:a771927a62fd | 3323 | if(mode->bitdepth == 8) |
embeddedartists | 0:a771927a62fd | 3324 | { |
embeddedartists | 0:a771927a62fd | 3325 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3326 | { |
embeddedartists | 0:a771927a62fd | 3327 | buffer[0] = in[i * 4 + 0]; |
embeddedartists | 0:a771927a62fd | 3328 | buffer[1] = in[i * 4 + 1]; |
embeddedartists | 0:a771927a62fd | 3329 | buffer[2] = in[i * 4 + 2]; |
embeddedartists | 0:a771927a62fd | 3330 | if(has_alpha) buffer[3] = in[i * 4 + 3]; |
embeddedartists | 0:a771927a62fd | 3331 | } |
embeddedartists | 0:a771927a62fd | 3332 | } |
embeddedartists | 0:a771927a62fd | 3333 | else |
embeddedartists | 0:a771927a62fd | 3334 | { |
embeddedartists | 0:a771927a62fd | 3335 | for(i = 0; i < numpixels; i++, buffer += num_channels) |
embeddedartists | 0:a771927a62fd | 3336 | { |
embeddedartists | 0:a771927a62fd | 3337 | buffer[0] = in[i * 8 + 0]; |
embeddedartists | 0:a771927a62fd | 3338 | buffer[1] = in[i * 8 + 2]; |
embeddedartists | 0:a771927a62fd | 3339 | buffer[2] = in[i * 8 + 4]; |
embeddedartists | 0:a771927a62fd | 3340 | if(has_alpha) buffer[3] = in[i * 8 + 6]; |
embeddedartists | 0:a771927a62fd | 3341 | } |
embeddedartists | 0:a771927a62fd | 3342 | } |
embeddedartists | 0:a771927a62fd | 3343 | } |
embeddedartists | 0:a771927a62fd | 3344 | |
embeddedartists | 0:a771927a62fd | 3345 | return 0; /*no error*/ |
embeddedartists | 0:a771927a62fd | 3346 | } |
embeddedartists | 0:a771927a62fd | 3347 | |
embeddedartists | 0:a771927a62fd | 3348 | /*Get RGBA16 color of pixel with index i (y * width + x) from the raw image with |
embeddedartists | 0:a771927a62fd | 3349 | given color type, but the given color type must be 16-bit itself.*/ |
embeddedartists | 0:a771927a62fd | 3350 | static unsigned getPixelColorRGBA16(unsigned short* r, unsigned short* g, unsigned short* b, unsigned short* a, |
embeddedartists | 0:a771927a62fd | 3351 | const unsigned char* in, size_t i, const LodePNGColorMode* mode) |
embeddedartists | 0:a771927a62fd | 3352 | { |
embeddedartists | 0:a771927a62fd | 3353 | if(mode->bitdepth != 16) return 85; /*error: this function only supports 16-bit input*/ |
embeddedartists | 0:a771927a62fd | 3354 | |
embeddedartists | 0:a771927a62fd | 3355 | if(mode->colortype == LCT_GREY) |
embeddedartists | 0:a771927a62fd | 3356 | { |
embeddedartists | 0:a771927a62fd | 3357 | *r = *g = *b = 256 * in[i * 2 + 0] + in[i * 2 + 1]; |
embeddedartists | 0:a771927a62fd | 3358 | if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0; |
embeddedartists | 0:a771927a62fd | 3359 | else *a = 65535; |
embeddedartists | 0:a771927a62fd | 3360 | } |
embeddedartists | 0:a771927a62fd | 3361 | else if(mode->colortype == LCT_RGB) |
embeddedartists | 0:a771927a62fd | 3362 | { |
embeddedartists | 0:a771927a62fd | 3363 | *r = 256 * in[i * 6 + 0] + in[i * 6 + 1]; |
embeddedartists | 0:a771927a62fd | 3364 | *g = 256 * in[i * 6 + 2] + in[i * 6 + 3]; |
embeddedartists | 0:a771927a62fd | 3365 | *b = 256 * in[i * 6 + 4] + in[i * 6 + 5]; |
embeddedartists | 0:a771927a62fd | 3366 | if(mode->key_defined && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r |
embeddedartists | 0:a771927a62fd | 3367 | && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g |
embeddedartists | 0:a771927a62fd | 3368 | && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0; |
embeddedartists | 0:a771927a62fd | 3369 | else *a = 65535; |
embeddedartists | 0:a771927a62fd | 3370 | } |
embeddedartists | 0:a771927a62fd | 3371 | else if(mode->colortype == LCT_GREY_ALPHA) |
embeddedartists | 0:a771927a62fd | 3372 | { |
embeddedartists | 0:a771927a62fd | 3373 | *r = *g = *b = 256 * in[i * 4 + 0] + in[i * 4 + 1]; |
embeddedartists | 0:a771927a62fd | 3374 | *a = 256 * in[i * 4 + 2] + in[i * 4 + 3]; |
embeddedartists | 0:a771927a62fd | 3375 | } |
embeddedartists | 0:a771927a62fd | 3376 | else if(mode->colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 3377 | { |
embeddedartists | 0:a771927a62fd | 3378 | *r = 256 * in[i * 8 + 0] + in[i * 8 + 1]; |
embeddedartists | 0:a771927a62fd | 3379 | *g = 256 * in[i * 8 + 2] + in[i * 8 + 3]; |
embeddedartists | 0:a771927a62fd | 3380 | *b = 256 * in[i * 8 + 4] + in[i * 8 + 5]; |
embeddedartists | 0:a771927a62fd | 3381 | *a = 256 * in[i * 8 + 6] + in[i * 8 + 7]; |
embeddedartists | 0:a771927a62fd | 3382 | } |
embeddedartists | 0:a771927a62fd | 3383 | else return 85; /*error: this function only supports 16-bit input, not palettes*/ |
embeddedartists | 0:a771927a62fd | 3384 | |
embeddedartists | 0:a771927a62fd | 3385 | return 0; /*no error*/ |
embeddedartists | 0:a771927a62fd | 3386 | } |
embeddedartists | 0:a771927a62fd | 3387 | |
embeddedartists | 0:a771927a62fd | 3388 | /* |
embeddedartists | 0:a771927a62fd | 3389 | converts from any color type to 24-bit or 32-bit (later maybe more supported). return value = LodePNG error code |
embeddedartists | 0:a771927a62fd | 3390 | the out buffer must have (w * h * bpp + 7) / 8 bytes, where bpp is the bits per pixel of the output color type |
embeddedartists | 0:a771927a62fd | 3391 | (lodepng_get_bpp) for < 8 bpp images, there may _not_ be padding bits at the end of scanlines. |
embeddedartists | 0:a771927a62fd | 3392 | */ |
embeddedartists | 0:a771927a62fd | 3393 | unsigned lodepng_convert(unsigned char* out, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 3394 | LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, |
embeddedartists | 0:a771927a62fd | 3395 | unsigned w, unsigned h, unsigned fix_png) |
embeddedartists | 0:a771927a62fd | 3396 | { |
embeddedartists | 0:a771927a62fd | 3397 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 3398 | size_t i; |
embeddedartists | 0:a771927a62fd | 3399 | ColorTree tree; |
embeddedartists | 0:a771927a62fd | 3400 | size_t numpixels = w * h; |
embeddedartists | 0:a771927a62fd | 3401 | |
embeddedartists | 0:a771927a62fd | 3402 | if(lodepng_color_mode_equal(mode_out, mode_in)) |
embeddedartists | 0:a771927a62fd | 3403 | { |
embeddedartists | 0:a771927a62fd | 3404 | size_t numbytes = lodepng_get_raw_size(w, h, mode_in); |
embeddedartists | 0:a771927a62fd | 3405 | for(i = 0; i < numbytes; i++) out[i] = in[i]; |
embeddedartists | 0:a771927a62fd | 3406 | return error; |
embeddedartists | 0:a771927a62fd | 3407 | } |
embeddedartists | 0:a771927a62fd | 3408 | |
embeddedartists | 0:a771927a62fd | 3409 | if(mode_out->colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 3410 | { |
embeddedartists | 0:a771927a62fd | 3411 | size_t palsize = 1 << mode_out->bitdepth; |
embeddedartists | 0:a771927a62fd | 3412 | if(mode_out->palettesize < palsize) palsize = mode_out->palettesize; |
embeddedartists | 0:a771927a62fd | 3413 | color_tree_init(&tree); |
embeddedartists | 0:a771927a62fd | 3414 | for(i = 0; i < palsize; i++) |
embeddedartists | 0:a771927a62fd | 3415 | { |
embeddedartists | 0:a771927a62fd | 3416 | unsigned char* p = &mode_out->palette[i * 4]; |
embeddedartists | 0:a771927a62fd | 3417 | color_tree_add(&tree, p[0], p[1], p[2], p[3], i); |
embeddedartists | 0:a771927a62fd | 3418 | } |
embeddedartists | 0:a771927a62fd | 3419 | } |
embeddedartists | 0:a771927a62fd | 3420 | |
embeddedartists | 0:a771927a62fd | 3421 | if(mode_in->bitdepth == 16 && mode_out->bitdepth == 16) |
embeddedartists | 0:a771927a62fd | 3422 | { |
embeddedartists | 0:a771927a62fd | 3423 | for(i = 0; i < numpixels; i++) |
embeddedartists | 0:a771927a62fd | 3424 | { |
embeddedartists | 0:a771927a62fd | 3425 | unsigned short r = 0, g = 0, b = 0, a = 0; |
embeddedartists | 0:a771927a62fd | 3426 | error = getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); |
embeddedartists | 0:a771927a62fd | 3427 | if(error) break; |
embeddedartists | 0:a771927a62fd | 3428 | error = rgba16ToPixel(out, i, mode_out, r, g, b, a); |
embeddedartists | 0:a771927a62fd | 3429 | if(error) break; |
embeddedartists | 0:a771927a62fd | 3430 | } |
embeddedartists | 0:a771927a62fd | 3431 | } |
embeddedartists | 0:a771927a62fd | 3432 | else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 3433 | { |
embeddedartists | 0:a771927a62fd | 3434 | error = getPixelColorsRGBA8(out, numpixels, 1, in, mode_in, fix_png); |
embeddedartists | 0:a771927a62fd | 3435 | } |
embeddedartists | 0:a771927a62fd | 3436 | else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGB) |
embeddedartists | 0:a771927a62fd | 3437 | { |
embeddedartists | 0:a771927a62fd | 3438 | error = getPixelColorsRGBA8(out, numpixels, 0, in, mode_in, fix_png); |
embeddedartists | 0:a771927a62fd | 3439 | } |
embeddedartists | 0:a771927a62fd | 3440 | else |
embeddedartists | 0:a771927a62fd | 3441 | { |
embeddedartists | 0:a771927a62fd | 3442 | unsigned char r = 0, g = 0, b = 0, a = 0; |
embeddedartists | 0:a771927a62fd | 3443 | for(i = 0; i < numpixels; i++) |
embeddedartists | 0:a771927a62fd | 3444 | { |
embeddedartists | 0:a771927a62fd | 3445 | error = getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in, fix_png); |
embeddedartists | 0:a771927a62fd | 3446 | if(error) break; |
embeddedartists | 0:a771927a62fd | 3447 | error = rgba8ToPixel(out, i, mode_out, &tree, r, g, b, a); |
embeddedartists | 0:a771927a62fd | 3448 | if(error) break; |
embeddedartists | 0:a771927a62fd | 3449 | } |
embeddedartists | 0:a771927a62fd | 3450 | } |
embeddedartists | 0:a771927a62fd | 3451 | |
embeddedartists | 0:a771927a62fd | 3452 | if(mode_out->colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 3453 | { |
embeddedartists | 0:a771927a62fd | 3454 | color_tree_cleanup(&tree); |
embeddedartists | 0:a771927a62fd | 3455 | } |
embeddedartists | 0:a771927a62fd | 3456 | |
embeddedartists | 0:a771927a62fd | 3457 | return error; |
embeddedartists | 0:a771927a62fd | 3458 | } |
embeddedartists | 0:a771927a62fd | 3459 | |
embeddedartists | 0:a771927a62fd | 3460 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 3461 | |
embeddedartists | 0:a771927a62fd | 3462 | typedef struct ColorProfile |
embeddedartists | 0:a771927a62fd | 3463 | { |
embeddedartists | 0:a771927a62fd | 3464 | unsigned char sixteenbit; /*needs more than 8 bits per channel*/ |
embeddedartists | 0:a771927a62fd | 3465 | unsigned char sixteenbit_done; |
embeddedartists | 0:a771927a62fd | 3466 | |
embeddedartists | 0:a771927a62fd | 3467 | |
embeddedartists | 0:a771927a62fd | 3468 | unsigned char colored; /*not greyscale*/ |
embeddedartists | 0:a771927a62fd | 3469 | unsigned char colored_done; |
embeddedartists | 0:a771927a62fd | 3470 | |
embeddedartists | 0:a771927a62fd | 3471 | unsigned char key; /*a color key is required, or more*/ |
embeddedartists | 0:a771927a62fd | 3472 | unsigned short key_r; /*these values are always in 16-bit bitdepth in the profile*/ |
embeddedartists | 0:a771927a62fd | 3473 | unsigned short key_g; |
embeddedartists | 0:a771927a62fd | 3474 | unsigned short key_b; |
embeddedartists | 0:a771927a62fd | 3475 | unsigned char alpha; /*alpha channel, or alpha palette, required*/ |
embeddedartists | 0:a771927a62fd | 3476 | unsigned char alpha_done; |
embeddedartists | 0:a771927a62fd | 3477 | |
embeddedartists | 0:a771927a62fd | 3478 | unsigned numcolors; |
embeddedartists | 0:a771927a62fd | 3479 | ColorTree tree; /*for listing the counted colors, up to 256*/ |
embeddedartists | 0:a771927a62fd | 3480 | unsigned char* palette; /*size 1024. Remember up to the first 256 RGBA colors*/ |
embeddedartists | 0:a771927a62fd | 3481 | unsigned maxnumcolors; /*if more than that amount counted*/ |
embeddedartists | 0:a771927a62fd | 3482 | unsigned char numcolors_done; |
embeddedartists | 0:a771927a62fd | 3483 | |
embeddedartists | 0:a771927a62fd | 3484 | unsigned greybits; /*amount of bits required for greyscale (1, 2, 4, 8). Does not take 16 bit into account.*/ |
embeddedartists | 0:a771927a62fd | 3485 | unsigned char greybits_done; |
embeddedartists | 0:a771927a62fd | 3486 | |
embeddedartists | 0:a771927a62fd | 3487 | } ColorProfile; |
embeddedartists | 0:a771927a62fd | 3488 | |
embeddedartists | 0:a771927a62fd | 3489 | static void color_profile_init(ColorProfile* profile, const LodePNGColorMode* mode) |
embeddedartists | 0:a771927a62fd | 3490 | { |
embeddedartists | 0:a771927a62fd | 3491 | profile->sixteenbit = 0; |
embeddedartists | 0:a771927a62fd | 3492 | profile->sixteenbit_done = mode->bitdepth == 16 ? 0 : 1; |
embeddedartists | 0:a771927a62fd | 3493 | |
embeddedartists | 0:a771927a62fd | 3494 | profile->colored = 0; |
embeddedartists | 0:a771927a62fd | 3495 | profile->colored_done = lodepng_is_greyscale_type(mode) ? 1 : 0; |
embeddedartists | 0:a771927a62fd | 3496 | |
embeddedartists | 0:a771927a62fd | 3497 | profile->key = 0; |
embeddedartists | 0:a771927a62fd | 3498 | profile->alpha = 0; |
embeddedartists | 0:a771927a62fd | 3499 | profile->alpha_done = lodepng_can_have_alpha(mode) ? 0 : 1; |
embeddedartists | 0:a771927a62fd | 3500 | |
embeddedartists | 0:a771927a62fd | 3501 | profile->numcolors = 0; |
embeddedartists | 0:a771927a62fd | 3502 | color_tree_init(&profile->tree); |
embeddedartists | 0:a771927a62fd | 3503 | profile->palette = (unsigned char*)lodepng_malloc(1024); |
embeddedartists | 0:a771927a62fd | 3504 | profile->maxnumcolors = 257; |
embeddedartists | 0:a771927a62fd | 3505 | if(lodepng_get_bpp(mode) <= 8) |
embeddedartists | 0:a771927a62fd | 3506 | { |
embeddedartists | 0:a771927a62fd | 3507 | int bpp = lodepng_get_bpp(mode); |
embeddedartists | 0:a771927a62fd | 3508 | profile->maxnumcolors = bpp == 1 ? 2 : (bpp == 2 ? 4 : (bpp == 4 ? 16 : 256)); |
embeddedartists | 0:a771927a62fd | 3509 | } |
embeddedartists | 0:a771927a62fd | 3510 | profile->numcolors_done = 0; |
embeddedartists | 0:a771927a62fd | 3511 | |
embeddedartists | 0:a771927a62fd | 3512 | profile->greybits = 1; |
embeddedartists | 0:a771927a62fd | 3513 | profile->greybits_done = lodepng_get_bpp(mode) == 1 ? 1 : 0; |
embeddedartists | 0:a771927a62fd | 3514 | } |
embeddedartists | 0:a771927a62fd | 3515 | |
embeddedartists | 0:a771927a62fd | 3516 | static void color_profile_cleanup(ColorProfile* profile) |
embeddedartists | 0:a771927a62fd | 3517 | { |
embeddedartists | 0:a771927a62fd | 3518 | color_tree_cleanup(&profile->tree); |
embeddedartists | 0:a771927a62fd | 3519 | lodepng_free(profile->palette); |
embeddedartists | 0:a771927a62fd | 3520 | } |
embeddedartists | 0:a771927a62fd | 3521 | |
embeddedartists | 0:a771927a62fd | 3522 | /*function used for debug purposes with C++*/ |
embeddedartists | 0:a771927a62fd | 3523 | /*void printColorProfile(ColorProfile* p) |
embeddedartists | 0:a771927a62fd | 3524 | { |
embeddedartists | 0:a771927a62fd | 3525 | std::cout << "sixteenbit: " << (int)p->sixteenbit << std::endl; |
embeddedartists | 0:a771927a62fd | 3526 | std::cout << "sixteenbit_done: " << (int)p->sixteenbit_done << std::endl; |
embeddedartists | 0:a771927a62fd | 3527 | std::cout << "colored: " << (int)p->colored << std::endl; |
embeddedartists | 0:a771927a62fd | 3528 | std::cout << "colored_done: " << (int)p->colored_done << std::endl; |
embeddedartists | 0:a771927a62fd | 3529 | std::cout << "key: " << (int)p->key << std::endl; |
embeddedartists | 0:a771927a62fd | 3530 | std::cout << "key_r: " << (int)p->key_r << std::endl; |
embeddedartists | 0:a771927a62fd | 3531 | std::cout << "key_g: " << (int)p->key_g << std::endl; |
embeddedartists | 0:a771927a62fd | 3532 | std::cout << "key_b: " << (int)p->key_b << std::endl; |
embeddedartists | 0:a771927a62fd | 3533 | std::cout << "alpha: " << (int)p->alpha << std::endl; |
embeddedartists | 0:a771927a62fd | 3534 | std::cout << "alpha_done: " << (int)p->alpha_done << std::endl; |
embeddedartists | 0:a771927a62fd | 3535 | std::cout << "numcolors: " << (int)p->numcolors << std::endl; |
embeddedartists | 0:a771927a62fd | 3536 | std::cout << "maxnumcolors: " << (int)p->maxnumcolors << std::endl; |
embeddedartists | 0:a771927a62fd | 3537 | std::cout << "numcolors_done: " << (int)p->numcolors_done << std::endl; |
embeddedartists | 0:a771927a62fd | 3538 | std::cout << "greybits: " << (int)p->greybits << std::endl; |
embeddedartists | 0:a771927a62fd | 3539 | std::cout << "greybits_done: " << (int)p->greybits_done << std::endl; |
embeddedartists | 0:a771927a62fd | 3540 | }*/ |
embeddedartists | 0:a771927a62fd | 3541 | |
embeddedartists | 0:a771927a62fd | 3542 | /*Returns how many bits needed to represent given value (max 8 bit)*/ |
embeddedartists | 0:a771927a62fd | 3543 | unsigned getValueRequiredBits(unsigned short value) |
embeddedartists | 0:a771927a62fd | 3544 | { |
embeddedartists | 0:a771927a62fd | 3545 | if(value == 0 || value == 255) return 1; |
embeddedartists | 0:a771927a62fd | 3546 | /*The scaling of 2-bit and 4-bit values uses multiples of 85 and 17*/ |
embeddedartists | 0:a771927a62fd | 3547 | if(value % 17 == 0) return value % 85 == 0 ? 2 : 4; |
embeddedartists | 0:a771927a62fd | 3548 | return 8; |
embeddedartists | 0:a771927a62fd | 3549 | } |
embeddedartists | 0:a771927a62fd | 3550 | |
embeddedartists | 0:a771927a62fd | 3551 | /*profile must already have been inited with mode. |
embeddedartists | 0:a771927a62fd | 3552 | It's ok to set some parameters of profile to done already.*/ |
embeddedartists | 0:a771927a62fd | 3553 | static unsigned get_color_profile(ColorProfile* profile, |
embeddedartists | 0:a771927a62fd | 3554 | const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 3555 | size_t numpixels /*must be full image size, for certain filesize based choices*/, |
embeddedartists | 0:a771927a62fd | 3556 | const LodePNGColorMode* mode, |
embeddedartists | 0:a771927a62fd | 3557 | unsigned fix_png) |
embeddedartists | 0:a771927a62fd | 3558 | { |
embeddedartists | 0:a771927a62fd | 3559 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 3560 | size_t i; |
embeddedartists | 0:a771927a62fd | 3561 | |
embeddedartists | 0:a771927a62fd | 3562 | if(mode->bitdepth == 16) |
embeddedartists | 0:a771927a62fd | 3563 | { |
embeddedartists | 0:a771927a62fd | 3564 | for(i = 0; i < numpixels; i++) |
embeddedartists | 0:a771927a62fd | 3565 | { |
embeddedartists | 0:a771927a62fd | 3566 | unsigned short r, g, b, a; |
embeddedartists | 0:a771927a62fd | 3567 | error = getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode); |
embeddedartists | 0:a771927a62fd | 3568 | if(error) break; |
embeddedartists | 0:a771927a62fd | 3569 | |
embeddedartists | 0:a771927a62fd | 3570 | /*a color is considered good for 8-bit if the first byte and the second byte are equal, |
embeddedartists | 0:a771927a62fd | 3571 | (so if it's divisible through 257), NOT necessarily if the second byte is 0*/ |
embeddedartists | 0:a771927a62fd | 3572 | if(!profile->sixteenbit_done |
embeddedartists | 0:a771927a62fd | 3573 | && (((r & 255) != ((r >> 8) & 255)) |
embeddedartists | 0:a771927a62fd | 3574 | || ((g & 255) != ((g >> 8) & 255)) |
embeddedartists | 0:a771927a62fd | 3575 | || ((b & 255) != ((b >> 8) & 255)))) |
embeddedartists | 0:a771927a62fd | 3576 | { |
embeddedartists | 0:a771927a62fd | 3577 | profile->sixteenbit = 1; |
embeddedartists | 0:a771927a62fd | 3578 | profile->sixteenbit_done = 1; |
embeddedartists | 0:a771927a62fd | 3579 | profile->greybits_done = 1; /*greybits is not applicable anymore at 16-bit*/ |
embeddedartists | 0:a771927a62fd | 3580 | profile->numcolors_done = 1; /*counting colors no longer useful, palette doesn't support 16-bit*/ |
embeddedartists | 0:a771927a62fd | 3581 | } |
embeddedartists | 0:a771927a62fd | 3582 | |
embeddedartists | 0:a771927a62fd | 3583 | if(!profile->colored_done && (r != g || r != b)) |
embeddedartists | 0:a771927a62fd | 3584 | { |
embeddedartists | 0:a771927a62fd | 3585 | profile->colored = 1; |
embeddedartists | 0:a771927a62fd | 3586 | profile->colored_done = 1; |
embeddedartists | 0:a771927a62fd | 3587 | profile->greybits_done = 1; /*greybits is not applicable anymore*/ |
embeddedartists | 0:a771927a62fd | 3588 | } |
embeddedartists | 0:a771927a62fd | 3589 | |
embeddedartists | 0:a771927a62fd | 3590 | if(!profile->alpha_done && a != 65535) |
embeddedartists | 0:a771927a62fd | 3591 | { |
embeddedartists | 0:a771927a62fd | 3592 | /*only use color key if numpixels large enough to justify tRNS chunk size*/ |
embeddedartists | 0:a771927a62fd | 3593 | if(a == 0 && numpixels > 16 && !(profile->key && (r != profile->key_r || g != profile->key_g || b != profile->key_b))) |
embeddedartists | 0:a771927a62fd | 3594 | { |
embeddedartists | 0:a771927a62fd | 3595 | if(!profile->alpha && !profile->key) |
embeddedartists | 0:a771927a62fd | 3596 | { |
embeddedartists | 0:a771927a62fd | 3597 | profile->key = 1; |
embeddedartists | 0:a771927a62fd | 3598 | profile->key_r = r; |
embeddedartists | 0:a771927a62fd | 3599 | profile->key_g = g; |
embeddedartists | 0:a771927a62fd | 3600 | profile->key_b = b; |
embeddedartists | 0:a771927a62fd | 3601 | } |
embeddedartists | 0:a771927a62fd | 3602 | } |
embeddedartists | 0:a771927a62fd | 3603 | else |
embeddedartists | 0:a771927a62fd | 3604 | { |
embeddedartists | 0:a771927a62fd | 3605 | profile->alpha = 1; |
embeddedartists | 0:a771927a62fd | 3606 | profile->alpha_done = 1; |
embeddedartists | 0:a771927a62fd | 3607 | profile->greybits_done = 1; /*greybits is not applicable anymore*/ |
embeddedartists | 0:a771927a62fd | 3608 | } |
embeddedartists | 0:a771927a62fd | 3609 | } |
embeddedartists | 0:a771927a62fd | 3610 | |
embeddedartists | 0:a771927a62fd | 3611 | /* Color key cannot be used if an opaque pixel also has that RGB color. */ |
embeddedartists | 0:a771927a62fd | 3612 | if(!profile->alpha_done && a == 65535 && profile->key |
embeddedartists | 0:a771927a62fd | 3613 | && r == profile->key_r && g == profile->key_g && b == profile->key_b) |
embeddedartists | 0:a771927a62fd | 3614 | { |
embeddedartists | 0:a771927a62fd | 3615 | profile->alpha = 1; |
embeddedartists | 0:a771927a62fd | 3616 | profile->alpha_done = 1; |
embeddedartists | 0:a771927a62fd | 3617 | profile->greybits_done = 1; /*greybits is not applicable anymore*/ |
embeddedartists | 0:a771927a62fd | 3618 | } |
embeddedartists | 0:a771927a62fd | 3619 | |
embeddedartists | 0:a771927a62fd | 3620 | if(!profile->greybits_done) |
embeddedartists | 0:a771927a62fd | 3621 | { |
embeddedartists | 0:a771927a62fd | 3622 | /*assuming 8-bit r, this test does not care about 16-bit*/ |
embeddedartists | 0:a771927a62fd | 3623 | unsigned bits = getValueRequiredBits(r); |
embeddedartists | 0:a771927a62fd | 3624 | if(bits > profile->greybits) profile->greybits = bits; |
embeddedartists | 0:a771927a62fd | 3625 | if(profile->greybits >= 8) profile->greybits_done = 1; |
embeddedartists | 0:a771927a62fd | 3626 | } |
embeddedartists | 0:a771927a62fd | 3627 | |
embeddedartists | 0:a771927a62fd | 3628 | if(!profile->numcolors_done) |
embeddedartists | 0:a771927a62fd | 3629 | { |
embeddedartists | 0:a771927a62fd | 3630 | /*assuming 8-bit rgba, this test does not care about 16-bit*/ |
embeddedartists | 0:a771927a62fd | 3631 | if(!color_tree_has(&profile->tree, (unsigned char)r, (unsigned char)g, (unsigned char)b, (unsigned char)a)) |
embeddedartists | 0:a771927a62fd | 3632 | { |
embeddedartists | 0:a771927a62fd | 3633 | color_tree_add(&profile->tree, (unsigned char)r, (unsigned char)g, (unsigned char)b, (unsigned char)a, |
embeddedartists | 0:a771927a62fd | 3634 | profile->numcolors); |
embeddedartists | 0:a771927a62fd | 3635 | if(profile->numcolors < 256) |
embeddedartists | 0:a771927a62fd | 3636 | { |
embeddedartists | 0:a771927a62fd | 3637 | unsigned char* p = profile->palette; |
embeddedartists | 0:a771927a62fd | 3638 | unsigned i = profile->numcolors; |
embeddedartists | 0:a771927a62fd | 3639 | p[i * 4 + 0] = (unsigned char)r; |
embeddedartists | 0:a771927a62fd | 3640 | p[i * 4 + 1] = (unsigned char)g; |
embeddedartists | 0:a771927a62fd | 3641 | p[i * 4 + 2] = (unsigned char)b; |
embeddedartists | 0:a771927a62fd | 3642 | p[i * 4 + 3] = (unsigned char)a; |
embeddedartists | 0:a771927a62fd | 3643 | } |
embeddedartists | 0:a771927a62fd | 3644 | profile->numcolors++; |
embeddedartists | 0:a771927a62fd | 3645 | if(profile->numcolors >= profile->maxnumcolors) profile->numcolors_done = 1; |
embeddedartists | 0:a771927a62fd | 3646 | } |
embeddedartists | 0:a771927a62fd | 3647 | } |
embeddedartists | 0:a771927a62fd | 3648 | |
embeddedartists | 0:a771927a62fd | 3649 | if(profile->alpha_done && profile->numcolors_done |
embeddedartists | 0:a771927a62fd | 3650 | && profile->colored_done && profile->sixteenbit_done && profile->greybits_done) |
embeddedartists | 0:a771927a62fd | 3651 | { |
embeddedartists | 0:a771927a62fd | 3652 | break; |
embeddedartists | 0:a771927a62fd | 3653 | } |
embeddedartists | 0:a771927a62fd | 3654 | }; |
embeddedartists | 0:a771927a62fd | 3655 | } |
embeddedartists | 0:a771927a62fd | 3656 | else /* < 16-bit */ |
embeddedartists | 0:a771927a62fd | 3657 | { |
embeddedartists | 0:a771927a62fd | 3658 | for(i = 0; i < numpixels; i++) |
embeddedartists | 0:a771927a62fd | 3659 | { |
embeddedartists | 0:a771927a62fd | 3660 | unsigned char r = 0, g = 0, b = 0, a = 0; |
embeddedartists | 0:a771927a62fd | 3661 | error = getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode, fix_png); |
embeddedartists | 0:a771927a62fd | 3662 | if(error) break; |
embeddedartists | 0:a771927a62fd | 3663 | |
embeddedartists | 0:a771927a62fd | 3664 | if(!profile->colored_done && (r != g || r != b)) |
embeddedartists | 0:a771927a62fd | 3665 | { |
embeddedartists | 0:a771927a62fd | 3666 | profile->colored = 1; |
embeddedartists | 0:a771927a62fd | 3667 | profile->colored_done = 1; |
embeddedartists | 0:a771927a62fd | 3668 | profile->greybits_done = 1; /*greybits is not applicable anymore*/ |
embeddedartists | 0:a771927a62fd | 3669 | } |
embeddedartists | 0:a771927a62fd | 3670 | |
embeddedartists | 0:a771927a62fd | 3671 | if(!profile->alpha_done && a != 255) |
embeddedartists | 0:a771927a62fd | 3672 | { |
embeddedartists | 0:a771927a62fd | 3673 | if(a == 0 && !(profile->key && (r != profile->key_r || g != profile->key_g || b != profile->key_b))) |
embeddedartists | 0:a771927a62fd | 3674 | { |
embeddedartists | 0:a771927a62fd | 3675 | if(!profile->key) |
embeddedartists | 0:a771927a62fd | 3676 | { |
embeddedartists | 0:a771927a62fd | 3677 | profile->key = 1; |
embeddedartists | 0:a771927a62fd | 3678 | profile->key_r = r; |
embeddedartists | 0:a771927a62fd | 3679 | profile->key_g = g; |
embeddedartists | 0:a771927a62fd | 3680 | profile->key_b = b; |
embeddedartists | 0:a771927a62fd | 3681 | } |
embeddedartists | 0:a771927a62fd | 3682 | } |
embeddedartists | 0:a771927a62fd | 3683 | else |
embeddedartists | 0:a771927a62fd | 3684 | { |
embeddedartists | 0:a771927a62fd | 3685 | profile->alpha = 1; |
embeddedartists | 0:a771927a62fd | 3686 | profile->alpha_done = 1; |
embeddedartists | 0:a771927a62fd | 3687 | profile->greybits_done = 1; /*greybits is not applicable anymore*/ |
embeddedartists | 0:a771927a62fd | 3688 | } |
embeddedartists | 0:a771927a62fd | 3689 | } |
embeddedartists | 0:a771927a62fd | 3690 | |
embeddedartists | 0:a771927a62fd | 3691 | /* Color key cannot be used if an opaque pixel also has that RGB color. */ |
embeddedartists | 0:a771927a62fd | 3692 | if(!profile->alpha_done && a == 255 && profile->key |
embeddedartists | 0:a771927a62fd | 3693 | && r == profile->key_r && g == profile->key_g && b == profile->key_b) |
embeddedartists | 0:a771927a62fd | 3694 | { |
embeddedartists | 0:a771927a62fd | 3695 | profile->alpha = 1; |
embeddedartists | 0:a771927a62fd | 3696 | profile->alpha_done = 1; |
embeddedartists | 0:a771927a62fd | 3697 | profile->greybits_done = 1; /*greybits is not applicable anymore*/ |
embeddedartists | 0:a771927a62fd | 3698 | } |
embeddedartists | 0:a771927a62fd | 3699 | |
embeddedartists | 0:a771927a62fd | 3700 | if(!profile->greybits_done) |
embeddedartists | 0:a771927a62fd | 3701 | { |
embeddedartists | 0:a771927a62fd | 3702 | unsigned bits = getValueRequiredBits(r); |
embeddedartists | 0:a771927a62fd | 3703 | if(bits > profile->greybits) profile->greybits = bits; |
embeddedartists | 0:a771927a62fd | 3704 | if(profile->greybits >= 8) profile->greybits_done = 1; |
embeddedartists | 0:a771927a62fd | 3705 | } |
embeddedartists | 0:a771927a62fd | 3706 | |
embeddedartists | 0:a771927a62fd | 3707 | if(!profile->numcolors_done) |
embeddedartists | 0:a771927a62fd | 3708 | { |
embeddedartists | 0:a771927a62fd | 3709 | if(!color_tree_has(&profile->tree, r, g, b, a)) |
embeddedartists | 0:a771927a62fd | 3710 | { |
embeddedartists | 0:a771927a62fd | 3711 | |
embeddedartists | 0:a771927a62fd | 3712 | color_tree_add(&profile->tree, r, g, b, a, profile->numcolors); |
embeddedartists | 0:a771927a62fd | 3713 | if(profile->numcolors < 256) |
embeddedartists | 0:a771927a62fd | 3714 | { |
embeddedartists | 0:a771927a62fd | 3715 | unsigned char* p = profile->palette; |
embeddedartists | 0:a771927a62fd | 3716 | unsigned i = profile->numcolors; |
embeddedartists | 0:a771927a62fd | 3717 | p[i * 4 + 0] = r; |
embeddedartists | 0:a771927a62fd | 3718 | p[i * 4 + 1] = g; |
embeddedartists | 0:a771927a62fd | 3719 | p[i * 4 + 2] = b; |
embeddedartists | 0:a771927a62fd | 3720 | p[i * 4 + 3] = a; |
embeddedartists | 0:a771927a62fd | 3721 | } |
embeddedartists | 0:a771927a62fd | 3722 | profile->numcolors++; |
embeddedartists | 0:a771927a62fd | 3723 | if(profile->numcolors >= profile->maxnumcolors) profile->numcolors_done = 1; |
embeddedartists | 0:a771927a62fd | 3724 | } |
embeddedartists | 0:a771927a62fd | 3725 | } |
embeddedartists | 0:a771927a62fd | 3726 | |
embeddedartists | 0:a771927a62fd | 3727 | if(profile->alpha_done && profile->numcolors_done && profile->colored_done && profile->greybits_done) |
embeddedartists | 0:a771927a62fd | 3728 | { |
embeddedartists | 0:a771927a62fd | 3729 | break; |
embeddedartists | 0:a771927a62fd | 3730 | } |
embeddedartists | 0:a771927a62fd | 3731 | }; |
embeddedartists | 0:a771927a62fd | 3732 | } |
embeddedartists | 0:a771927a62fd | 3733 | |
embeddedartists | 0:a771927a62fd | 3734 | /*make the profile's key always 16-bit for consistency*/ |
embeddedartists | 0:a771927a62fd | 3735 | if(mode->bitdepth < 16) |
embeddedartists | 0:a771927a62fd | 3736 | { |
embeddedartists | 0:a771927a62fd | 3737 | /*repeat each byte twice*/ |
embeddedartists | 0:a771927a62fd | 3738 | profile->key_r *= 257; |
embeddedartists | 0:a771927a62fd | 3739 | profile->key_g *= 257; |
embeddedartists | 0:a771927a62fd | 3740 | profile->key_b *= 257; |
embeddedartists | 0:a771927a62fd | 3741 | } |
embeddedartists | 0:a771927a62fd | 3742 | |
embeddedartists | 0:a771927a62fd | 3743 | return error; |
embeddedartists | 0:a771927a62fd | 3744 | } |
embeddedartists | 0:a771927a62fd | 3745 | |
embeddedartists | 0:a771927a62fd | 3746 | static void setColorKeyFrom16bit(LodePNGColorMode* mode_out, unsigned r, unsigned g, unsigned b, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 3747 | { |
embeddedartists | 0:a771927a62fd | 3748 | unsigned mask = (1 << bitdepth) - 1; |
embeddedartists | 0:a771927a62fd | 3749 | mode_out->key_defined = 1; |
embeddedartists | 0:a771927a62fd | 3750 | mode_out->key_r = r & mask; |
embeddedartists | 0:a771927a62fd | 3751 | mode_out->key_g = g & mask; |
embeddedartists | 0:a771927a62fd | 3752 | mode_out->key_b = b & mask; |
embeddedartists | 0:a771927a62fd | 3753 | } |
embeddedartists | 0:a771927a62fd | 3754 | |
embeddedartists | 0:a771927a62fd | 3755 | /*updates values of mode with a potentially smaller color model. mode_out should |
embeddedartists | 0:a771927a62fd | 3756 | contain the user chosen color model, but will be overwritten with the new chosen one.*/ |
embeddedartists | 0:a771927a62fd | 3757 | unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out, |
embeddedartists | 0:a771927a62fd | 3758 | const unsigned char* image, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 3759 | const LodePNGColorMode* mode_in, |
embeddedartists | 0:a771927a62fd | 3760 | LodePNGAutoConvert auto_convert) |
embeddedartists | 0:a771927a62fd | 3761 | { |
embeddedartists | 0:a771927a62fd | 3762 | ColorProfile profile; |
embeddedartists | 0:a771927a62fd | 3763 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 3764 | int no_nibbles = auto_convert == LAC_AUTO_NO_NIBBLES || auto_convert == LAC_AUTO_NO_NIBBLES_NO_PALETTE; |
embeddedartists | 0:a771927a62fd | 3765 | int no_palette = auto_convert == LAC_AUTO_NO_PALETTE || auto_convert == LAC_AUTO_NO_NIBBLES_NO_PALETTE; |
embeddedartists | 0:a771927a62fd | 3766 | |
embeddedartists | 0:a771927a62fd | 3767 | if(auto_convert == LAC_ALPHA) |
embeddedartists | 0:a771927a62fd | 3768 | { |
embeddedartists | 0:a771927a62fd | 3769 | if(mode_out->colortype != LCT_RGBA && mode_out->colortype != LCT_GREY_ALPHA) return 0; |
embeddedartists | 0:a771927a62fd | 3770 | } |
embeddedartists | 0:a771927a62fd | 3771 | |
embeddedartists | 0:a771927a62fd | 3772 | color_profile_init(&profile, mode_in); |
embeddedartists | 0:a771927a62fd | 3773 | if(auto_convert == LAC_ALPHA) |
embeddedartists | 0:a771927a62fd | 3774 | { |
embeddedartists | 0:a771927a62fd | 3775 | profile.colored_done = 1; |
embeddedartists | 0:a771927a62fd | 3776 | profile.greybits_done = 1; |
embeddedartists | 0:a771927a62fd | 3777 | profile.numcolors_done = 1; |
embeddedartists | 0:a771927a62fd | 3778 | profile.sixteenbit_done = 1; |
embeddedartists | 0:a771927a62fd | 3779 | } |
embeddedartists | 0:a771927a62fd | 3780 | error = get_color_profile(&profile, image, w * h, mode_in, 0 /*fix_png*/); |
embeddedartists | 0:a771927a62fd | 3781 | if(!error && auto_convert == LAC_ALPHA) |
embeddedartists | 0:a771927a62fd | 3782 | { |
embeddedartists | 0:a771927a62fd | 3783 | if(!profile.alpha) |
embeddedartists | 0:a771927a62fd | 3784 | { |
embeddedartists | 0:a771927a62fd | 3785 | mode_out->colortype = (mode_out->colortype == LCT_RGBA ? LCT_RGB : LCT_GREY); |
embeddedartists | 0:a771927a62fd | 3786 | if(profile.key) setColorKeyFrom16bit(mode_out, profile.key_r, profile.key_g, profile.key_b, mode_out->bitdepth); |
embeddedartists | 0:a771927a62fd | 3787 | } |
embeddedartists | 0:a771927a62fd | 3788 | } |
embeddedartists | 0:a771927a62fd | 3789 | else if(!error && auto_convert != LAC_ALPHA) |
embeddedartists | 0:a771927a62fd | 3790 | { |
embeddedartists | 0:a771927a62fd | 3791 | mode_out->key_defined = 0; |
embeddedartists | 0:a771927a62fd | 3792 | |
embeddedartists | 0:a771927a62fd | 3793 | if(profile.sixteenbit) |
embeddedartists | 0:a771927a62fd | 3794 | { |
embeddedartists | 0:a771927a62fd | 3795 | mode_out->bitdepth = 16; |
embeddedartists | 0:a771927a62fd | 3796 | if(profile.alpha) |
embeddedartists | 0:a771927a62fd | 3797 | { |
embeddedartists | 0:a771927a62fd | 3798 | mode_out->colortype = profile.colored ? LCT_RGBA : LCT_GREY_ALPHA; |
embeddedartists | 0:a771927a62fd | 3799 | } |
embeddedartists | 0:a771927a62fd | 3800 | else |
embeddedartists | 0:a771927a62fd | 3801 | { |
embeddedartists | 0:a771927a62fd | 3802 | mode_out->colortype = profile.colored ? LCT_RGB : LCT_GREY; |
embeddedartists | 0:a771927a62fd | 3803 | if(profile.key) setColorKeyFrom16bit(mode_out, profile.key_r, profile.key_g, profile.key_b, mode_out->bitdepth); |
embeddedartists | 0:a771927a62fd | 3804 | } |
embeddedartists | 0:a771927a62fd | 3805 | } |
embeddedartists | 0:a771927a62fd | 3806 | else /*less than 16 bits per channel*/ |
embeddedartists | 0:a771927a62fd | 3807 | { |
embeddedartists | 0:a771927a62fd | 3808 | /*don't add palette overhead if image hasn't got a lot of pixels*/ |
embeddedartists | 0:a771927a62fd | 3809 | unsigned n = profile.numcolors; |
embeddedartists | 0:a771927a62fd | 3810 | int palette_ok = !no_palette && n <= 256 && (n * 2 < w * h); |
embeddedartists | 0:a771927a62fd | 3811 | unsigned palettebits = n <= 2 ? 1 : (n <= 4 ? 2 : (n <= 16 ? 4 : 8)); |
embeddedartists | 0:a771927a62fd | 3812 | int grey_ok = !profile.colored && !profile.alpha; /*grey without alpha, with potentially low bits*/ |
embeddedartists | 0:a771927a62fd | 3813 | if(palette_ok || grey_ok) |
embeddedartists | 0:a771927a62fd | 3814 | { |
embeddedartists | 0:a771927a62fd | 3815 | if(!palette_ok || (grey_ok && profile.greybits <= palettebits)) |
embeddedartists | 0:a771927a62fd | 3816 | { |
embeddedartists | 0:a771927a62fd | 3817 | unsigned grey = profile.key_r; |
embeddedartists | 0:a771927a62fd | 3818 | mode_out->colortype = LCT_GREY; |
embeddedartists | 0:a771927a62fd | 3819 | mode_out->bitdepth = profile.greybits; |
embeddedartists | 0:a771927a62fd | 3820 | if(profile.key) setColorKeyFrom16bit(mode_out, grey, grey, grey, mode_out->bitdepth); |
embeddedartists | 0:a771927a62fd | 3821 | } |
embeddedartists | 0:a771927a62fd | 3822 | else |
embeddedartists | 0:a771927a62fd | 3823 | { |
embeddedartists | 0:a771927a62fd | 3824 | /*fill in the palette*/ |
embeddedartists | 0:a771927a62fd | 3825 | unsigned i; |
embeddedartists | 0:a771927a62fd | 3826 | unsigned char* p = profile.palette; |
embeddedartists | 0:a771927a62fd | 3827 | /*remove potential earlier palette*/ |
embeddedartists | 0:a771927a62fd | 3828 | lodepng_palette_clear(mode_out); |
embeddedartists | 0:a771927a62fd | 3829 | for(i = 0; i < profile.numcolors; i++) |
embeddedartists | 0:a771927a62fd | 3830 | { |
embeddedartists | 0:a771927a62fd | 3831 | error = lodepng_palette_add(mode_out, p[i * 4 + 0], p[i * 4 + 1], p[i * 4 + 2], p[i * 4 + 3]); |
embeddedartists | 0:a771927a62fd | 3832 | if(error) break; |
embeddedartists | 0:a771927a62fd | 3833 | } |
embeddedartists | 0:a771927a62fd | 3834 | |
embeddedartists | 0:a771927a62fd | 3835 | mode_out->colortype = LCT_PALETTE; |
embeddedartists | 0:a771927a62fd | 3836 | mode_out->bitdepth = palettebits; |
embeddedartists | 0:a771927a62fd | 3837 | } |
embeddedartists | 0:a771927a62fd | 3838 | } |
embeddedartists | 0:a771927a62fd | 3839 | else /*8-bit per channel*/ |
embeddedartists | 0:a771927a62fd | 3840 | { |
embeddedartists | 0:a771927a62fd | 3841 | mode_out->bitdepth = 8; |
embeddedartists | 0:a771927a62fd | 3842 | if(profile.alpha) |
embeddedartists | 0:a771927a62fd | 3843 | { |
embeddedartists | 0:a771927a62fd | 3844 | mode_out->colortype = profile.colored ? LCT_RGBA : LCT_GREY_ALPHA; |
embeddedartists | 0:a771927a62fd | 3845 | } |
embeddedartists | 0:a771927a62fd | 3846 | else |
embeddedartists | 0:a771927a62fd | 3847 | { |
embeddedartists | 0:a771927a62fd | 3848 | mode_out->colortype = profile.colored ? LCT_RGB : LCT_GREY /*LCT_GREY normally won't occur, already done earlier*/; |
embeddedartists | 0:a771927a62fd | 3849 | if(profile.key) setColorKeyFrom16bit(mode_out, profile.key_r, profile.key_g, profile.key_b, mode_out->bitdepth); |
embeddedartists | 0:a771927a62fd | 3850 | } |
embeddedartists | 0:a771927a62fd | 3851 | } |
embeddedartists | 0:a771927a62fd | 3852 | } |
embeddedartists | 0:a771927a62fd | 3853 | } |
embeddedartists | 0:a771927a62fd | 3854 | |
embeddedartists | 0:a771927a62fd | 3855 | color_profile_cleanup(&profile); |
embeddedartists | 0:a771927a62fd | 3856 | |
embeddedartists | 0:a771927a62fd | 3857 | if(mode_out->colortype == LCT_PALETTE && mode_in->palettesize == mode_out->palettesize) |
embeddedartists | 0:a771927a62fd | 3858 | { |
embeddedartists | 0:a771927a62fd | 3859 | /*In this case keep the palette order of the input, so that the user can choose an optimal one*/ |
embeddedartists | 0:a771927a62fd | 3860 | size_t i; |
embeddedartists | 0:a771927a62fd | 3861 | for(i = 0; i < mode_in->palettesize * 4; i++) |
embeddedartists | 0:a771927a62fd | 3862 | { |
embeddedartists | 0:a771927a62fd | 3863 | mode_out->palette[i] = mode_in->palette[i]; |
embeddedartists | 0:a771927a62fd | 3864 | } |
embeddedartists | 0:a771927a62fd | 3865 | } |
embeddedartists | 0:a771927a62fd | 3866 | |
embeddedartists | 0:a771927a62fd | 3867 | if(no_nibbles && mode_out->bitdepth < 8) |
embeddedartists | 0:a771927a62fd | 3868 | { |
embeddedartists | 0:a771927a62fd | 3869 | /*palette can keep its small amount of colors, as long as no indices use it*/ |
embeddedartists | 0:a771927a62fd | 3870 | mode_out->bitdepth = 8; |
embeddedartists | 0:a771927a62fd | 3871 | } |
embeddedartists | 0:a771927a62fd | 3872 | |
embeddedartists | 0:a771927a62fd | 3873 | return error; |
embeddedartists | 0:a771927a62fd | 3874 | } |
embeddedartists | 0:a771927a62fd | 3875 | |
embeddedartists | 0:a771927a62fd | 3876 | #endif /* #ifdef LODEPNG_COMPILE_ENCODER */ |
embeddedartists | 0:a771927a62fd | 3877 | |
embeddedartists | 0:a771927a62fd | 3878 | /* |
embeddedartists | 0:a771927a62fd | 3879 | Paeth predicter, used by PNG filter type 4 |
embeddedartists | 0:a771927a62fd | 3880 | The parameters are of type short, but should come from unsigned chars, the shorts |
embeddedartists | 0:a771927a62fd | 3881 | are only needed to make the paeth calculation correct. |
embeddedartists | 0:a771927a62fd | 3882 | */ |
embeddedartists | 0:a771927a62fd | 3883 | static unsigned char paethPredictor(short a, short b, short c) |
embeddedartists | 0:a771927a62fd | 3884 | { |
embeddedartists | 0:a771927a62fd | 3885 | short pa = abs(b - c); |
embeddedartists | 0:a771927a62fd | 3886 | short pb = abs(a - c); |
embeddedartists | 0:a771927a62fd | 3887 | short pc = abs(a + b - c - c); |
embeddedartists | 0:a771927a62fd | 3888 | |
embeddedartists | 0:a771927a62fd | 3889 | if(pc < pa && pc < pb) return (unsigned char)c; |
embeddedartists | 0:a771927a62fd | 3890 | else if(pb < pa) return (unsigned char)b; |
embeddedartists | 0:a771927a62fd | 3891 | else return (unsigned char)a; |
embeddedartists | 0:a771927a62fd | 3892 | } |
embeddedartists | 0:a771927a62fd | 3893 | |
embeddedartists | 0:a771927a62fd | 3894 | /*shared values used by multiple Adam7 related functions*/ |
embeddedartists | 0:a771927a62fd | 3895 | |
embeddedartists | 0:a771927a62fd | 3896 | static const unsigned ADAM7_IX[7] = { 0, 4, 0, 2, 0, 1, 0 }; /*x start values*/ |
embeddedartists | 0:a771927a62fd | 3897 | static const unsigned ADAM7_IY[7] = { 0, 0, 4, 0, 2, 0, 1 }; /*y start values*/ |
embeddedartists | 0:a771927a62fd | 3898 | static const unsigned ADAM7_DX[7] = { 8, 8, 4, 4, 2, 2, 1 }; /*x delta values*/ |
embeddedartists | 0:a771927a62fd | 3899 | static const unsigned ADAM7_DY[7] = { 8, 8, 8, 4, 4, 2, 2 }; /*y delta values*/ |
embeddedartists | 0:a771927a62fd | 3900 | |
embeddedartists | 0:a771927a62fd | 3901 | /* |
embeddedartists | 0:a771927a62fd | 3902 | Outputs various dimensions and positions in the image related to the Adam7 reduced images. |
embeddedartists | 0:a771927a62fd | 3903 | passw: output containing the width of the 7 passes |
embeddedartists | 0:a771927a62fd | 3904 | passh: output containing the height of the 7 passes |
embeddedartists | 0:a771927a62fd | 3905 | filter_passstart: output containing the index of the start and end of each |
embeddedartists | 0:a771927a62fd | 3906 | reduced image with filter bytes |
embeddedartists | 0:a771927a62fd | 3907 | padded_passstart output containing the index of the start and end of each |
embeddedartists | 0:a771927a62fd | 3908 | reduced image when without filter bytes but with padded scanlines |
embeddedartists | 0:a771927a62fd | 3909 | passstart: output containing the index of the start and end of each reduced |
embeddedartists | 0:a771927a62fd | 3910 | image without padding between scanlines, but still padding between the images |
embeddedartists | 0:a771927a62fd | 3911 | w, h: width and height of non-interlaced image |
embeddedartists | 0:a771927a62fd | 3912 | bpp: bits per pixel |
embeddedartists | 0:a771927a62fd | 3913 | "padded" is only relevant if bpp is less than 8 and a scanline or image does not |
embeddedartists | 0:a771927a62fd | 3914 | end at a full byte |
embeddedartists | 0:a771927a62fd | 3915 | */ |
embeddedartists | 0:a771927a62fd | 3916 | static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8], |
embeddedartists | 0:a771927a62fd | 3917 | size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp) |
embeddedartists | 0:a771927a62fd | 3918 | { |
embeddedartists | 0:a771927a62fd | 3919 | /*the passstart values have 8 values: the 8th one indicates the byte after the end of the 7th (= last) pass*/ |
embeddedartists | 0:a771927a62fd | 3920 | unsigned i; |
embeddedartists | 0:a771927a62fd | 3921 | |
embeddedartists | 0:a771927a62fd | 3922 | /*calculate width and height in pixels of each pass*/ |
embeddedartists | 0:a771927a62fd | 3923 | for(i = 0; i < 7; i++) |
embeddedartists | 0:a771927a62fd | 3924 | { |
embeddedartists | 0:a771927a62fd | 3925 | passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i]; |
embeddedartists | 0:a771927a62fd | 3926 | passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i]; |
embeddedartists | 0:a771927a62fd | 3927 | if(passw[i] == 0) passh[i] = 0; |
embeddedartists | 0:a771927a62fd | 3928 | if(passh[i] == 0) passw[i] = 0; |
embeddedartists | 0:a771927a62fd | 3929 | } |
embeddedartists | 0:a771927a62fd | 3930 | |
embeddedartists | 0:a771927a62fd | 3931 | filter_passstart[0] = padded_passstart[0] = passstart[0] = 0; |
embeddedartists | 0:a771927a62fd | 3932 | for(i = 0; i < 7; i++) |
embeddedartists | 0:a771927a62fd | 3933 | { |
embeddedartists | 0:a771927a62fd | 3934 | /*if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte)*/ |
embeddedartists | 0:a771927a62fd | 3935 | filter_passstart[i + 1] = filter_passstart[i] |
embeddedartists | 0:a771927a62fd | 3936 | + ((passw[i] && passh[i]) ? passh[i] * (1 + (passw[i] * bpp + 7) / 8) : 0); |
embeddedartists | 0:a771927a62fd | 3937 | /*bits padded if needed to fill full byte at end of each scanline*/ |
embeddedartists | 0:a771927a62fd | 3938 | padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7) / 8); |
embeddedartists | 0:a771927a62fd | 3939 | /*only padded at end of reduced image*/ |
embeddedartists | 0:a771927a62fd | 3940 | passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7) / 8; |
embeddedartists | 0:a771927a62fd | 3941 | } |
embeddedartists | 0:a771927a62fd | 3942 | } |
embeddedartists | 0:a771927a62fd | 3943 | |
embeddedartists | 0:a771927a62fd | 3944 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 3945 | |
embeddedartists | 0:a771927a62fd | 3946 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 3947 | /* / PNG Decoder / */ |
embeddedartists | 0:a771927a62fd | 3948 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 3949 | |
embeddedartists | 0:a771927a62fd | 3950 | /*read the information from the header and store it in the LodePNGInfo. return value is error*/ |
embeddedartists | 0:a771927a62fd | 3951 | unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state, |
embeddedartists | 0:a771927a62fd | 3952 | const unsigned char* in, size_t insize) |
embeddedartists | 0:a771927a62fd | 3953 | { |
embeddedartists | 0:a771927a62fd | 3954 | LodePNGInfo* info = &state->info_png; |
embeddedartists | 0:a771927a62fd | 3955 | if(insize == 0 || in == 0) |
embeddedartists | 0:a771927a62fd | 3956 | { |
embeddedartists | 0:a771927a62fd | 3957 | CERROR_RETURN_ERROR(state->error, 48); /*error: the given data is empty*/ |
embeddedartists | 0:a771927a62fd | 3958 | } |
embeddedartists | 0:a771927a62fd | 3959 | if(insize < 29) |
embeddedartists | 0:a771927a62fd | 3960 | { |
embeddedartists | 0:a771927a62fd | 3961 | CERROR_RETURN_ERROR(state->error, 27); /*error: the data length is smaller than the length of a PNG header*/ |
embeddedartists | 0:a771927a62fd | 3962 | } |
embeddedartists | 0:a771927a62fd | 3963 | |
embeddedartists | 0:a771927a62fd | 3964 | /*when decoding a new PNG image, make sure all parameters created after previous decoding are reset*/ |
embeddedartists | 0:a771927a62fd | 3965 | lodepng_info_cleanup(info); |
embeddedartists | 0:a771927a62fd | 3966 | lodepng_info_init(info); |
embeddedartists | 0:a771927a62fd | 3967 | |
embeddedartists | 0:a771927a62fd | 3968 | if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71 |
embeddedartists | 0:a771927a62fd | 3969 | || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) |
embeddedartists | 0:a771927a62fd | 3970 | { |
embeddedartists | 0:a771927a62fd | 3971 | CERROR_RETURN_ERROR(state->error, 28); /*error: the first 8 bytes are not the correct PNG signature*/ |
embeddedartists | 0:a771927a62fd | 3972 | } |
embeddedartists | 0:a771927a62fd | 3973 | if(in[12] != 'I' || in[13] != 'H' || in[14] != 'D' || in[15] != 'R') |
embeddedartists | 0:a771927a62fd | 3974 | { |
embeddedartists | 0:a771927a62fd | 3975 | CERROR_RETURN_ERROR(state->error, 29); /*error: it doesn't start with a IHDR chunk!*/ |
embeddedartists | 0:a771927a62fd | 3976 | } |
embeddedartists | 0:a771927a62fd | 3977 | |
embeddedartists | 0:a771927a62fd | 3978 | /*read the values given in the header*/ |
embeddedartists | 0:a771927a62fd | 3979 | *w = lodepng_read32bitInt(&in[16]); |
embeddedartists | 0:a771927a62fd | 3980 | *h = lodepng_read32bitInt(&in[20]); |
embeddedartists | 0:a771927a62fd | 3981 | info->color.bitdepth = in[24]; |
embeddedartists | 0:a771927a62fd | 3982 | info->color.colortype = (LodePNGColorType)in[25]; |
embeddedartists | 0:a771927a62fd | 3983 | info->compression_method = in[26]; |
embeddedartists | 0:a771927a62fd | 3984 | info->filter_method = in[27]; |
embeddedartists | 0:a771927a62fd | 3985 | info->interlace_method = in[28]; |
embeddedartists | 0:a771927a62fd | 3986 | |
embeddedartists | 0:a771927a62fd | 3987 | if(!state->decoder.ignore_crc) |
embeddedartists | 0:a771927a62fd | 3988 | { |
embeddedartists | 0:a771927a62fd | 3989 | unsigned CRC = lodepng_read32bitInt(&in[29]); |
embeddedartists | 0:a771927a62fd | 3990 | unsigned checksum = lodepng_crc32(&in[12], 17); |
embeddedartists | 0:a771927a62fd | 3991 | if(CRC != checksum) |
embeddedartists | 0:a771927a62fd | 3992 | { |
embeddedartists | 0:a771927a62fd | 3993 | CERROR_RETURN_ERROR(state->error, 57); /*invalid CRC*/ |
embeddedartists | 0:a771927a62fd | 3994 | } |
embeddedartists | 0:a771927a62fd | 3995 | } |
embeddedartists | 0:a771927a62fd | 3996 | |
embeddedartists | 0:a771927a62fd | 3997 | /*error: only compression method 0 is allowed in the specification*/ |
embeddedartists | 0:a771927a62fd | 3998 | if(info->compression_method != 0) CERROR_RETURN_ERROR(state->error, 32); |
embeddedartists | 0:a771927a62fd | 3999 | /*error: only filter method 0 is allowed in the specification*/ |
embeddedartists | 0:a771927a62fd | 4000 | if(info->filter_method != 0) CERROR_RETURN_ERROR(state->error, 33); |
embeddedartists | 0:a771927a62fd | 4001 | /*error: only interlace methods 0 and 1 exist in the specification*/ |
embeddedartists | 0:a771927a62fd | 4002 | if(info->interlace_method > 1) CERROR_RETURN_ERROR(state->error, 34); |
embeddedartists | 0:a771927a62fd | 4003 | |
embeddedartists | 0:a771927a62fd | 4004 | state->error = checkColorValidity(info->color.colortype, info->color.bitdepth); |
embeddedartists | 0:a771927a62fd | 4005 | return state->error; |
embeddedartists | 0:a771927a62fd | 4006 | } |
embeddedartists | 0:a771927a62fd | 4007 | |
embeddedartists | 0:a771927a62fd | 4008 | static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon, |
embeddedartists | 0:a771927a62fd | 4009 | size_t bytewidth, unsigned char filterType, size_t length) |
embeddedartists | 0:a771927a62fd | 4010 | { |
embeddedartists | 0:a771927a62fd | 4011 | /* |
embeddedartists | 0:a771927a62fd | 4012 | For PNG filter method 0 |
embeddedartists | 0:a771927a62fd | 4013 | unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte, |
embeddedartists | 0:a771927a62fd | 4014 | the filter works byte per byte (bytewidth = 1) |
embeddedartists | 0:a771927a62fd | 4015 | precon is the previous unfiltered scanline, recon the result, scanline the current one |
embeddedartists | 0:a771927a62fd | 4016 | the incoming scanlines do NOT include the filtertype byte, that one is given in the parameter filterType instead |
embeddedartists | 0:a771927a62fd | 4017 | recon and scanline MAY be the same memory address! precon must be disjoint. |
embeddedartists | 0:a771927a62fd | 4018 | */ |
embeddedartists | 0:a771927a62fd | 4019 | |
embeddedartists | 0:a771927a62fd | 4020 | size_t i; |
embeddedartists | 0:a771927a62fd | 4021 | switch(filterType) |
embeddedartists | 0:a771927a62fd | 4022 | { |
embeddedartists | 0:a771927a62fd | 4023 | case 0: |
embeddedartists | 0:a771927a62fd | 4024 | for(i = 0; i < length; i++) recon[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 4025 | break; |
embeddedartists | 0:a771927a62fd | 4026 | case 1: |
embeddedartists | 0:a771927a62fd | 4027 | for(i = 0; i < bytewidth; i++) recon[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 4028 | for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth]; |
embeddedartists | 0:a771927a62fd | 4029 | break; |
embeddedartists | 0:a771927a62fd | 4030 | case 2: |
embeddedartists | 0:a771927a62fd | 4031 | if(precon) |
embeddedartists | 0:a771927a62fd | 4032 | { |
embeddedartists | 0:a771927a62fd | 4033 | for(i = 0; i < length; i++) recon[i] = scanline[i] + precon[i]; |
embeddedartists | 0:a771927a62fd | 4034 | } |
embeddedartists | 0:a771927a62fd | 4035 | else |
embeddedartists | 0:a771927a62fd | 4036 | { |
embeddedartists | 0:a771927a62fd | 4037 | for(i = 0; i < length; i++) recon[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 4038 | } |
embeddedartists | 0:a771927a62fd | 4039 | break; |
embeddedartists | 0:a771927a62fd | 4040 | case 3: |
embeddedartists | 0:a771927a62fd | 4041 | if(precon) |
embeddedartists | 0:a771927a62fd | 4042 | { |
embeddedartists | 0:a771927a62fd | 4043 | for(i = 0; i < bytewidth; i++) recon[i] = scanline[i] + precon[i] / 2; |
embeddedartists | 0:a771927a62fd | 4044 | for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) / 2); |
embeddedartists | 0:a771927a62fd | 4045 | } |
embeddedartists | 0:a771927a62fd | 4046 | else |
embeddedartists | 0:a771927a62fd | 4047 | { |
embeddedartists | 0:a771927a62fd | 4048 | for(i = 0; i < bytewidth; i++) recon[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 4049 | for(i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth] / 2; |
embeddedartists | 0:a771927a62fd | 4050 | } |
embeddedartists | 0:a771927a62fd | 4051 | break; |
embeddedartists | 0:a771927a62fd | 4052 | case 4: |
embeddedartists | 0:a771927a62fd | 4053 | if(precon) |
embeddedartists | 0:a771927a62fd | 4054 | { |
embeddedartists | 0:a771927a62fd | 4055 | for(i = 0; i < bytewidth; i++) |
embeddedartists | 0:a771927a62fd | 4056 | { |
embeddedartists | 0:a771927a62fd | 4057 | recon[i] = (scanline[i] + precon[i]); /*paethPredictor(0, precon[i], 0) is always precon[i]*/ |
embeddedartists | 0:a771927a62fd | 4058 | } |
embeddedartists | 0:a771927a62fd | 4059 | for(i = bytewidth; i < length; i++) |
embeddedartists | 0:a771927a62fd | 4060 | { |
embeddedartists | 0:a771927a62fd | 4061 | recon[i] = (scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth])); |
embeddedartists | 0:a771927a62fd | 4062 | } |
embeddedartists | 0:a771927a62fd | 4063 | } |
embeddedartists | 0:a771927a62fd | 4064 | else |
embeddedartists | 0:a771927a62fd | 4065 | { |
embeddedartists | 0:a771927a62fd | 4066 | for(i = 0; i < bytewidth; i++) |
embeddedartists | 0:a771927a62fd | 4067 | { |
embeddedartists | 0:a771927a62fd | 4068 | recon[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 4069 | } |
embeddedartists | 0:a771927a62fd | 4070 | for(i = bytewidth; i < length; i++) |
embeddedartists | 0:a771927a62fd | 4071 | { |
embeddedartists | 0:a771927a62fd | 4072 | /*paethPredictor(recon[i - bytewidth], 0, 0) is always recon[i - bytewidth]*/ |
embeddedartists | 0:a771927a62fd | 4073 | recon[i] = (scanline[i] + recon[i - bytewidth]); |
embeddedartists | 0:a771927a62fd | 4074 | } |
embeddedartists | 0:a771927a62fd | 4075 | } |
embeddedartists | 0:a771927a62fd | 4076 | break; |
embeddedartists | 0:a771927a62fd | 4077 | default: return 36; /*error: unexisting filter type given*/ |
embeddedartists | 0:a771927a62fd | 4078 | } |
embeddedartists | 0:a771927a62fd | 4079 | return 0; |
embeddedartists | 0:a771927a62fd | 4080 | } |
embeddedartists | 0:a771927a62fd | 4081 | |
embeddedartists | 0:a771927a62fd | 4082 | static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) |
embeddedartists | 0:a771927a62fd | 4083 | { |
embeddedartists | 0:a771927a62fd | 4084 | /* |
embeddedartists | 0:a771927a62fd | 4085 | For PNG filter method 0 |
embeddedartists | 0:a771927a62fd | 4086 | this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 seven times) |
embeddedartists | 0:a771927a62fd | 4087 | out must have enough bytes allocated already, in must have the scanlines + 1 filtertype byte per scanline |
embeddedartists | 0:a771927a62fd | 4088 | w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel |
embeddedartists | 0:a771927a62fd | 4089 | in and out are allowed to be the same memory address (but aren't the same size since in has the extra filter bytes) |
embeddedartists | 0:a771927a62fd | 4090 | */ |
embeddedartists | 0:a771927a62fd | 4091 | |
embeddedartists | 0:a771927a62fd | 4092 | unsigned y; |
embeddedartists | 0:a771927a62fd | 4093 | unsigned char* prevline = 0; |
embeddedartists | 0:a771927a62fd | 4094 | |
embeddedartists | 0:a771927a62fd | 4095 | /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ |
embeddedartists | 0:a771927a62fd | 4096 | size_t bytewidth = (bpp + 7) / 8; |
embeddedartists | 0:a771927a62fd | 4097 | size_t linebytes = (w * bpp + 7) / 8; |
embeddedartists | 0:a771927a62fd | 4098 | |
embeddedartists | 0:a771927a62fd | 4099 | for(y = 0; y < h; y++) |
embeddedartists | 0:a771927a62fd | 4100 | { |
embeddedartists | 0:a771927a62fd | 4101 | size_t outindex = linebytes * y; |
embeddedartists | 0:a771927a62fd | 4102 | size_t inindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ |
embeddedartists | 0:a771927a62fd | 4103 | unsigned char filterType = in[inindex]; |
embeddedartists | 0:a771927a62fd | 4104 | |
embeddedartists | 0:a771927a62fd | 4105 | CERROR_TRY_RETURN(unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterType, linebytes)); |
embeddedartists | 0:a771927a62fd | 4106 | |
embeddedartists | 0:a771927a62fd | 4107 | prevline = &out[outindex]; |
embeddedartists | 0:a771927a62fd | 4108 | } |
embeddedartists | 0:a771927a62fd | 4109 | |
embeddedartists | 0:a771927a62fd | 4110 | return 0; |
embeddedartists | 0:a771927a62fd | 4111 | } |
embeddedartists | 0:a771927a62fd | 4112 | |
embeddedartists | 0:a771927a62fd | 4113 | /* |
embeddedartists | 0:a771927a62fd | 4114 | in: Adam7 interlaced image, with no padding bits between scanlines, but between |
embeddedartists | 0:a771927a62fd | 4115 | reduced images so that each reduced image starts at a byte. |
embeddedartists | 0:a771927a62fd | 4116 | out: the same pixels, but re-ordered so that they're now a non-interlaced image with size w*h |
embeddedartists | 0:a771927a62fd | 4117 | bpp: bits per pixel |
embeddedartists | 0:a771927a62fd | 4118 | out has the following size in bits: w * h * bpp. |
embeddedartists | 0:a771927a62fd | 4119 | in is possibly bigger due to padding bits between reduced images. |
embeddedartists | 0:a771927a62fd | 4120 | out must be big enough AND must be 0 everywhere if bpp < 8 in the current implementation |
embeddedartists | 0:a771927a62fd | 4121 | (because that's likely a little bit faster) |
embeddedartists | 0:a771927a62fd | 4122 | NOTE: comments about padding bits are only relevant if bpp < 8 |
embeddedartists | 0:a771927a62fd | 4123 | */ |
embeddedartists | 0:a771927a62fd | 4124 | static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) |
embeddedartists | 0:a771927a62fd | 4125 | { |
embeddedartists | 0:a771927a62fd | 4126 | unsigned passw[7], passh[7]; |
embeddedartists | 0:a771927a62fd | 4127 | size_t filter_passstart[8], padded_passstart[8], passstart[8]; |
embeddedartists | 0:a771927a62fd | 4128 | unsigned i; |
embeddedartists | 0:a771927a62fd | 4129 | |
embeddedartists | 0:a771927a62fd | 4130 | Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); |
embeddedartists | 0:a771927a62fd | 4131 | |
embeddedartists | 0:a771927a62fd | 4132 | if(bpp >= 8) |
embeddedartists | 0:a771927a62fd | 4133 | { |
embeddedartists | 0:a771927a62fd | 4134 | for(i = 0; i < 7; i++) |
embeddedartists | 0:a771927a62fd | 4135 | { |
embeddedartists | 0:a771927a62fd | 4136 | unsigned x, y, b; |
embeddedartists | 0:a771927a62fd | 4137 | size_t bytewidth = bpp / 8; |
embeddedartists | 0:a771927a62fd | 4138 | for(y = 0; y < passh[i]; y++) |
embeddedartists | 0:a771927a62fd | 4139 | for(x = 0; x < passw[i]; x++) |
embeddedartists | 0:a771927a62fd | 4140 | { |
embeddedartists | 0:a771927a62fd | 4141 | size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth; |
embeddedartists | 0:a771927a62fd | 4142 | size_t pixeloutstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; |
embeddedartists | 0:a771927a62fd | 4143 | for(b = 0; b < bytewidth; b++) |
embeddedartists | 0:a771927a62fd | 4144 | { |
embeddedartists | 0:a771927a62fd | 4145 | out[pixeloutstart + b] = in[pixelinstart + b]; |
embeddedartists | 0:a771927a62fd | 4146 | } |
embeddedartists | 0:a771927a62fd | 4147 | } |
embeddedartists | 0:a771927a62fd | 4148 | } |
embeddedartists | 0:a771927a62fd | 4149 | } |
embeddedartists | 0:a771927a62fd | 4150 | else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ |
embeddedartists | 0:a771927a62fd | 4151 | { |
embeddedartists | 0:a771927a62fd | 4152 | for(i = 0; i < 7; i++) |
embeddedartists | 0:a771927a62fd | 4153 | { |
embeddedartists | 0:a771927a62fd | 4154 | unsigned x, y, b; |
embeddedartists | 0:a771927a62fd | 4155 | unsigned ilinebits = bpp * passw[i]; |
embeddedartists | 0:a771927a62fd | 4156 | unsigned olinebits = bpp * w; |
embeddedartists | 0:a771927a62fd | 4157 | size_t obp, ibp; /*bit pointers (for out and in buffer)*/ |
embeddedartists | 0:a771927a62fd | 4158 | for(y = 0; y < passh[i]; y++) |
embeddedartists | 0:a771927a62fd | 4159 | for(x = 0; x < passw[i]; x++) |
embeddedartists | 0:a771927a62fd | 4160 | { |
embeddedartists | 0:a771927a62fd | 4161 | ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp); |
embeddedartists | 0:a771927a62fd | 4162 | obp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; |
embeddedartists | 0:a771927a62fd | 4163 | for(b = 0; b < bpp; b++) |
embeddedartists | 0:a771927a62fd | 4164 | { |
embeddedartists | 0:a771927a62fd | 4165 | unsigned char bit = readBitFromReversedStream(&ibp, in); |
embeddedartists | 0:a771927a62fd | 4166 | /*note that this function assumes the out buffer is completely 0, use setBitOfReversedStream otherwise*/ |
embeddedartists | 0:a771927a62fd | 4167 | setBitOfReversedStream0(&obp, out, bit); |
embeddedartists | 0:a771927a62fd | 4168 | } |
embeddedartists | 0:a771927a62fd | 4169 | } |
embeddedartists | 0:a771927a62fd | 4170 | } |
embeddedartists | 0:a771927a62fd | 4171 | } |
embeddedartists | 0:a771927a62fd | 4172 | } |
embeddedartists | 0:a771927a62fd | 4173 | |
embeddedartists | 0:a771927a62fd | 4174 | static void removePaddingBits(unsigned char* out, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 4175 | size_t olinebits, size_t ilinebits, unsigned h) |
embeddedartists | 0:a771927a62fd | 4176 | { |
embeddedartists | 0:a771927a62fd | 4177 | /* |
embeddedartists | 0:a771927a62fd | 4178 | After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need |
embeddedartists | 0:a771927a62fd | 4179 | to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers |
embeddedartists | 0:a771927a62fd | 4180 | for the Adam7 code, the color convert code and the output to the user. |
embeddedartists | 0:a771927a62fd | 4181 | in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must |
embeddedartists | 0:a771927a62fd | 4182 | have >= ilinebits*h bits, out must have >= olinebits*h bits, olinebits must be <= ilinebits |
embeddedartists | 0:a771927a62fd | 4183 | also used to move bits after earlier such operations happened, e.g. in a sequence of reduced images from Adam7 |
embeddedartists | 0:a771927a62fd | 4184 | only useful if (ilinebits - olinebits) is a value in the range 1..7 |
embeddedartists | 0:a771927a62fd | 4185 | */ |
embeddedartists | 0:a771927a62fd | 4186 | unsigned y; |
embeddedartists | 0:a771927a62fd | 4187 | size_t diff = ilinebits - olinebits; |
embeddedartists | 0:a771927a62fd | 4188 | size_t ibp = 0, obp = 0; /*input and output bit pointers*/ |
embeddedartists | 0:a771927a62fd | 4189 | for(y = 0; y < h; y++) |
embeddedartists | 0:a771927a62fd | 4190 | { |
embeddedartists | 0:a771927a62fd | 4191 | size_t x; |
embeddedartists | 0:a771927a62fd | 4192 | for(x = 0; x < olinebits; x++) |
embeddedartists | 0:a771927a62fd | 4193 | { |
embeddedartists | 0:a771927a62fd | 4194 | unsigned char bit = readBitFromReversedStream(&ibp, in); |
embeddedartists | 0:a771927a62fd | 4195 | setBitOfReversedStream(&obp, out, bit); |
embeddedartists | 0:a771927a62fd | 4196 | } |
embeddedartists | 0:a771927a62fd | 4197 | ibp += diff; |
embeddedartists | 0:a771927a62fd | 4198 | } |
embeddedartists | 0:a771927a62fd | 4199 | } |
embeddedartists | 0:a771927a62fd | 4200 | |
embeddedartists | 0:a771927a62fd | 4201 | /*out must be buffer big enough to contain full image, and in must contain the full decompressed data from |
embeddedartists | 0:a771927a62fd | 4202 | the IDAT chunks (with filter index bytes and possible padding bits) |
embeddedartists | 0:a771927a62fd | 4203 | return value is error*/ |
embeddedartists | 0:a771927a62fd | 4204 | static unsigned postProcessScanlines(unsigned char* out, unsigned char* in, |
embeddedartists | 0:a771927a62fd | 4205 | unsigned w, unsigned h, const LodePNGInfo* info_png) |
embeddedartists | 0:a771927a62fd | 4206 | { |
embeddedartists | 0:a771927a62fd | 4207 | /* |
embeddedartists | 0:a771927a62fd | 4208 | This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype. |
embeddedartists | 0:a771927a62fd | 4209 | Steps: |
embeddedartists | 0:a771927a62fd | 4210 | *) if no Adam7: 1) unfilter 2) remove padding bits (= posible extra bits per scanline if bpp < 8) |
embeddedartists | 0:a771927a62fd | 4211 | *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace |
embeddedartists | 0:a771927a62fd | 4212 | NOTE: the in buffer will be overwritten with intermediate data! |
embeddedartists | 0:a771927a62fd | 4213 | */ |
embeddedartists | 0:a771927a62fd | 4214 | unsigned bpp = lodepng_get_bpp(&info_png->color); |
embeddedartists | 0:a771927a62fd | 4215 | if(bpp == 0) return 31; /*error: invalid colortype*/ |
embeddedartists | 0:a771927a62fd | 4216 | |
embeddedartists | 0:a771927a62fd | 4217 | if(info_png->interlace_method == 0) |
embeddedartists | 0:a771927a62fd | 4218 | { |
embeddedartists | 0:a771927a62fd | 4219 | if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8) |
embeddedartists | 0:a771927a62fd | 4220 | { |
embeddedartists | 0:a771927a62fd | 4221 | CERROR_TRY_RETURN(unfilter(in, in, w, h, bpp)); |
embeddedartists | 0:a771927a62fd | 4222 | removePaddingBits(out, in, w * bpp, ((w * bpp + 7) / 8) * 8, h); |
embeddedartists | 0:a771927a62fd | 4223 | } |
embeddedartists | 0:a771927a62fd | 4224 | /*we can immediatly filter into the out buffer, no other steps needed*/ |
embeddedartists | 0:a771927a62fd | 4225 | else CERROR_TRY_RETURN(unfilter(out, in, w, h, bpp)); |
embeddedartists | 0:a771927a62fd | 4226 | } |
embeddedartists | 0:a771927a62fd | 4227 | else /*interlace_method is 1 (Adam7)*/ |
embeddedartists | 0:a771927a62fd | 4228 | { |
embeddedartists | 0:a771927a62fd | 4229 | unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; |
embeddedartists | 0:a771927a62fd | 4230 | unsigned i; |
embeddedartists | 0:a771927a62fd | 4231 | |
embeddedartists | 0:a771927a62fd | 4232 | Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); |
embeddedartists | 0:a771927a62fd | 4233 | |
embeddedartists | 0:a771927a62fd | 4234 | for(i = 0; i < 7; i++) |
embeddedartists | 0:a771927a62fd | 4235 | { |
embeddedartists | 0:a771927a62fd | 4236 | CERROR_TRY_RETURN(unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp)); |
embeddedartists | 0:a771927a62fd | 4237 | /*TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline, |
embeddedartists | 0:a771927a62fd | 4238 | move bytes instead of bits or move not at all*/ |
embeddedartists | 0:a771927a62fd | 4239 | if(bpp < 8) |
embeddedartists | 0:a771927a62fd | 4240 | { |
embeddedartists | 0:a771927a62fd | 4241 | /*remove padding bits in scanlines; after this there still may be padding |
embeddedartists | 0:a771927a62fd | 4242 | bits between the different reduced images: each reduced image still starts nicely at a byte*/ |
embeddedartists | 0:a771927a62fd | 4243 | removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp, |
embeddedartists | 0:a771927a62fd | 4244 | ((passw[i] * bpp + 7) / 8) * 8, passh[i]); |
embeddedartists | 0:a771927a62fd | 4245 | } |
embeddedartists | 0:a771927a62fd | 4246 | } |
embeddedartists | 0:a771927a62fd | 4247 | |
embeddedartists | 0:a771927a62fd | 4248 | Adam7_deinterlace(out, in, w, h, bpp); |
embeddedartists | 0:a771927a62fd | 4249 | } |
embeddedartists | 0:a771927a62fd | 4250 | |
embeddedartists | 0:a771927a62fd | 4251 | return 0; |
embeddedartists | 0:a771927a62fd | 4252 | } |
embeddedartists | 0:a771927a62fd | 4253 | |
embeddedartists | 0:a771927a62fd | 4254 | static unsigned readChunk_PLTE(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) |
embeddedartists | 0:a771927a62fd | 4255 | { |
embeddedartists | 0:a771927a62fd | 4256 | unsigned pos = 0, i; |
embeddedartists | 0:a771927a62fd | 4257 | if(color->palette) lodepng_free(color->palette); |
embeddedartists | 0:a771927a62fd | 4258 | color->palettesize = chunkLength / 3; |
embeddedartists | 0:a771927a62fd | 4259 | color->palette = (unsigned char*)lodepng_malloc(4 * color->palettesize); |
embeddedartists | 0:a771927a62fd | 4260 | if(!color->palette && color->palettesize) |
embeddedartists | 0:a771927a62fd | 4261 | { |
embeddedartists | 0:a771927a62fd | 4262 | color->palettesize = 0; |
embeddedartists | 0:a771927a62fd | 4263 | return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4264 | } |
embeddedartists | 0:a771927a62fd | 4265 | if(color->palettesize > 256) return 38; /*error: palette too big*/ |
embeddedartists | 0:a771927a62fd | 4266 | |
embeddedartists | 0:a771927a62fd | 4267 | for(i = 0; i < color->palettesize; i++) |
embeddedartists | 0:a771927a62fd | 4268 | { |
embeddedartists | 0:a771927a62fd | 4269 | color->palette[4 * i + 0] = data[pos++]; /*R*/ |
embeddedartists | 0:a771927a62fd | 4270 | color->palette[4 * i + 1] = data[pos++]; /*G*/ |
embeddedartists | 0:a771927a62fd | 4271 | color->palette[4 * i + 2] = data[pos++]; /*B*/ |
embeddedartists | 0:a771927a62fd | 4272 | color->palette[4 * i + 3] = 255; /*alpha*/ |
embeddedartists | 0:a771927a62fd | 4273 | } |
embeddedartists | 0:a771927a62fd | 4274 | |
embeddedartists | 0:a771927a62fd | 4275 | return 0; /* OK */ |
embeddedartists | 0:a771927a62fd | 4276 | } |
embeddedartists | 0:a771927a62fd | 4277 | |
embeddedartists | 0:a771927a62fd | 4278 | static unsigned readChunk_tRNS(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) |
embeddedartists | 0:a771927a62fd | 4279 | { |
embeddedartists | 0:a771927a62fd | 4280 | unsigned i; |
embeddedartists | 0:a771927a62fd | 4281 | if(color->colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 4282 | { |
embeddedartists | 0:a771927a62fd | 4283 | /*error: more alpha values given than there are palette entries*/ |
embeddedartists | 0:a771927a62fd | 4284 | if(chunkLength > color->palettesize) return 38; |
embeddedartists | 0:a771927a62fd | 4285 | |
embeddedartists | 0:a771927a62fd | 4286 | for(i = 0; i < chunkLength; i++) color->palette[4 * i + 3] = data[i]; |
embeddedartists | 0:a771927a62fd | 4287 | } |
embeddedartists | 0:a771927a62fd | 4288 | else if(color->colortype == LCT_GREY) |
embeddedartists | 0:a771927a62fd | 4289 | { |
embeddedartists | 0:a771927a62fd | 4290 | /*error: this chunk must be 2 bytes for greyscale image*/ |
embeddedartists | 0:a771927a62fd | 4291 | if(chunkLength != 2) return 30; |
embeddedartists | 0:a771927a62fd | 4292 | |
embeddedartists | 0:a771927a62fd | 4293 | color->key_defined = 1; |
embeddedartists | 0:a771927a62fd | 4294 | color->key_r = color->key_g = color->key_b = 256 * data[0] + data[1]; |
embeddedartists | 0:a771927a62fd | 4295 | } |
embeddedartists | 0:a771927a62fd | 4296 | else if(color->colortype == LCT_RGB) |
embeddedartists | 0:a771927a62fd | 4297 | { |
embeddedartists | 0:a771927a62fd | 4298 | /*error: this chunk must be 6 bytes for RGB image*/ |
embeddedartists | 0:a771927a62fd | 4299 | if(chunkLength != 6) return 41; |
embeddedartists | 0:a771927a62fd | 4300 | |
embeddedartists | 0:a771927a62fd | 4301 | color->key_defined = 1; |
embeddedartists | 0:a771927a62fd | 4302 | color->key_r = 256 * data[0] + data[1]; |
embeddedartists | 0:a771927a62fd | 4303 | color->key_g = 256 * data[2] + data[3]; |
embeddedartists | 0:a771927a62fd | 4304 | color->key_b = 256 * data[4] + data[5]; |
embeddedartists | 0:a771927a62fd | 4305 | } |
embeddedartists | 0:a771927a62fd | 4306 | else return 42; /*error: tRNS chunk not allowed for other color models*/ |
embeddedartists | 0:a771927a62fd | 4307 | |
embeddedartists | 0:a771927a62fd | 4308 | return 0; /* OK */ |
embeddedartists | 0:a771927a62fd | 4309 | } |
embeddedartists | 0:a771927a62fd | 4310 | |
embeddedartists | 0:a771927a62fd | 4311 | |
embeddedartists | 0:a771927a62fd | 4312 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 4313 | /*background color chunk (bKGD)*/ |
embeddedartists | 0:a771927a62fd | 4314 | static unsigned readChunk_bKGD(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) |
embeddedartists | 0:a771927a62fd | 4315 | { |
embeddedartists | 0:a771927a62fd | 4316 | if(info->color.colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 4317 | { |
embeddedartists | 0:a771927a62fd | 4318 | /*error: this chunk must be 1 byte for indexed color image*/ |
embeddedartists | 0:a771927a62fd | 4319 | if(chunkLength != 1) return 43; |
embeddedartists | 0:a771927a62fd | 4320 | |
embeddedartists | 0:a771927a62fd | 4321 | info->background_defined = 1; |
embeddedartists | 0:a771927a62fd | 4322 | info->background_r = info->background_g = info->background_b = data[0]; |
embeddedartists | 0:a771927a62fd | 4323 | } |
embeddedartists | 0:a771927a62fd | 4324 | else if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) |
embeddedartists | 0:a771927a62fd | 4325 | { |
embeddedartists | 0:a771927a62fd | 4326 | /*error: this chunk must be 2 bytes for greyscale image*/ |
embeddedartists | 0:a771927a62fd | 4327 | if(chunkLength != 2) return 44; |
embeddedartists | 0:a771927a62fd | 4328 | |
embeddedartists | 0:a771927a62fd | 4329 | info->background_defined = 1; |
embeddedartists | 0:a771927a62fd | 4330 | info->background_r = info->background_g = info->background_b |
embeddedartists | 0:a771927a62fd | 4331 | = 256 * data[0] + data[1]; |
embeddedartists | 0:a771927a62fd | 4332 | } |
embeddedartists | 0:a771927a62fd | 4333 | else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 4334 | { |
embeddedartists | 0:a771927a62fd | 4335 | /*error: this chunk must be 6 bytes for greyscale image*/ |
embeddedartists | 0:a771927a62fd | 4336 | if(chunkLength != 6) return 45; |
embeddedartists | 0:a771927a62fd | 4337 | |
embeddedartists | 0:a771927a62fd | 4338 | info->background_defined = 1; |
embeddedartists | 0:a771927a62fd | 4339 | info->background_r = 256 * data[0] + data[1]; |
embeddedartists | 0:a771927a62fd | 4340 | info->background_g = 256 * data[2] + data[3]; |
embeddedartists | 0:a771927a62fd | 4341 | info->background_b = 256 * data[4] + data[5]; |
embeddedartists | 0:a771927a62fd | 4342 | } |
embeddedartists | 0:a771927a62fd | 4343 | |
embeddedartists | 0:a771927a62fd | 4344 | return 0; /* OK */ |
embeddedartists | 0:a771927a62fd | 4345 | } |
embeddedartists | 0:a771927a62fd | 4346 | |
embeddedartists | 0:a771927a62fd | 4347 | /*text chunk (tEXt)*/ |
embeddedartists | 0:a771927a62fd | 4348 | static unsigned readChunk_tEXt(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) |
embeddedartists | 0:a771927a62fd | 4349 | { |
embeddedartists | 0:a771927a62fd | 4350 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 4351 | char *key = 0, *str = 0; |
embeddedartists | 0:a771927a62fd | 4352 | unsigned i; |
embeddedartists | 0:a771927a62fd | 4353 | |
embeddedartists | 0:a771927a62fd | 4354 | while(!error) /*not really a while loop, only used to break on error*/ |
embeddedartists | 0:a771927a62fd | 4355 | { |
embeddedartists | 0:a771927a62fd | 4356 | unsigned length, string2_begin; |
embeddedartists | 0:a771927a62fd | 4357 | |
embeddedartists | 0:a771927a62fd | 4358 | length = 0; |
embeddedartists | 0:a771927a62fd | 4359 | while(length < chunkLength && data[length] != 0) length++; |
embeddedartists | 0:a771927a62fd | 4360 | /*even though it's not allowed by the standard, no error is thrown if |
embeddedartists | 0:a771927a62fd | 4361 | there's no null termination char, if the text is empty*/ |
embeddedartists | 0:a771927a62fd | 4362 | if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/ |
embeddedartists | 0:a771927a62fd | 4363 | |
embeddedartists | 0:a771927a62fd | 4364 | key = (char*)lodepng_malloc(length + 1); |
embeddedartists | 0:a771927a62fd | 4365 | if(!key) CERROR_BREAK(error, 83); /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4366 | |
embeddedartists | 0:a771927a62fd | 4367 | key[length] = 0; |
embeddedartists | 0:a771927a62fd | 4368 | for(i = 0; i < length; i++) key[i] = data[i]; |
embeddedartists | 0:a771927a62fd | 4369 | |
embeddedartists | 0:a771927a62fd | 4370 | string2_begin = length + 1; /*skip keyword null terminator*/ |
embeddedartists | 0:a771927a62fd | 4371 | |
embeddedartists | 0:a771927a62fd | 4372 | length = chunkLength < string2_begin ? 0 : chunkLength - string2_begin; |
embeddedartists | 0:a771927a62fd | 4373 | str = (char*)lodepng_malloc(length + 1); |
embeddedartists | 0:a771927a62fd | 4374 | if(!str) CERROR_BREAK(error, 83); /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4375 | |
embeddedartists | 0:a771927a62fd | 4376 | str[length] = 0; |
embeddedartists | 0:a771927a62fd | 4377 | for(i = 0; i < length; i++) str[i] = data[string2_begin + i]; |
embeddedartists | 0:a771927a62fd | 4378 | |
embeddedartists | 0:a771927a62fd | 4379 | error = lodepng_add_text(info, key, str); |
embeddedartists | 0:a771927a62fd | 4380 | |
embeddedartists | 0:a771927a62fd | 4381 | break; |
embeddedartists | 0:a771927a62fd | 4382 | } |
embeddedartists | 0:a771927a62fd | 4383 | |
embeddedartists | 0:a771927a62fd | 4384 | lodepng_free(key); |
embeddedartists | 0:a771927a62fd | 4385 | lodepng_free(str); |
embeddedartists | 0:a771927a62fd | 4386 | |
embeddedartists | 0:a771927a62fd | 4387 | return error; |
embeddedartists | 0:a771927a62fd | 4388 | } |
embeddedartists | 0:a771927a62fd | 4389 | |
embeddedartists | 0:a771927a62fd | 4390 | /*compressed text chunk (zTXt)*/ |
embeddedartists | 0:a771927a62fd | 4391 | static unsigned readChunk_zTXt(LodePNGInfo* info, const LodePNGDecompressSettings* zlibsettings, |
embeddedartists | 0:a771927a62fd | 4392 | const unsigned char* data, size_t chunkLength) |
embeddedartists | 0:a771927a62fd | 4393 | { |
embeddedartists | 0:a771927a62fd | 4394 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 4395 | unsigned i; |
embeddedartists | 0:a771927a62fd | 4396 | |
embeddedartists | 0:a771927a62fd | 4397 | unsigned length, string2_begin; |
embeddedartists | 0:a771927a62fd | 4398 | char *key = 0; |
embeddedartists | 0:a771927a62fd | 4399 | ucvector decoded; |
embeddedartists | 0:a771927a62fd | 4400 | |
embeddedartists | 0:a771927a62fd | 4401 | ucvector_init(&decoded); |
embeddedartists | 0:a771927a62fd | 4402 | |
embeddedartists | 0:a771927a62fd | 4403 | while(!error) /*not really a while loop, only used to break on error*/ |
embeddedartists | 0:a771927a62fd | 4404 | { |
embeddedartists | 0:a771927a62fd | 4405 | for(length = 0; length < chunkLength && data[length] != 0; length++) ; |
embeddedartists | 0:a771927a62fd | 4406 | if(length + 2 >= chunkLength) CERROR_BREAK(error, 75); /*no null termination, corrupt?*/ |
embeddedartists | 0:a771927a62fd | 4407 | if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/ |
embeddedartists | 0:a771927a62fd | 4408 | |
embeddedartists | 0:a771927a62fd | 4409 | key = (char*)lodepng_malloc(length + 1); |
embeddedartists | 0:a771927a62fd | 4410 | if(!key) CERROR_BREAK(error, 83); /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4411 | |
embeddedartists | 0:a771927a62fd | 4412 | key[length] = 0; |
embeddedartists | 0:a771927a62fd | 4413 | for(i = 0; i < length; i++) key[i] = data[i]; |
embeddedartists | 0:a771927a62fd | 4414 | |
embeddedartists | 0:a771927a62fd | 4415 | if(data[length + 1] != 0) CERROR_BREAK(error, 72); /*the 0 byte indicating compression must be 0*/ |
embeddedartists | 0:a771927a62fd | 4416 | |
embeddedartists | 0:a771927a62fd | 4417 | string2_begin = length + 2; |
embeddedartists | 0:a771927a62fd | 4418 | if(string2_begin > chunkLength) CERROR_BREAK(error, 75); /*no null termination, corrupt?*/ |
embeddedartists | 0:a771927a62fd | 4419 | |
embeddedartists | 0:a771927a62fd | 4420 | length = chunkLength - string2_begin; |
embeddedartists | 0:a771927a62fd | 4421 | /*will fail if zlib error, e.g. if length is too small*/ |
embeddedartists | 0:a771927a62fd | 4422 | error = zlib_decompress(&decoded.data, &decoded.size, |
embeddedartists | 0:a771927a62fd | 4423 | (unsigned char*)(&data[string2_begin]), |
embeddedartists | 0:a771927a62fd | 4424 | length, zlibsettings); |
embeddedartists | 0:a771927a62fd | 4425 | if(error) break; |
embeddedartists | 0:a771927a62fd | 4426 | ucvector_push_back(&decoded, 0); |
embeddedartists | 0:a771927a62fd | 4427 | |
embeddedartists | 0:a771927a62fd | 4428 | error = lodepng_add_text(info, key, (char*)decoded.data); |
embeddedartists | 0:a771927a62fd | 4429 | |
embeddedartists | 0:a771927a62fd | 4430 | break; |
embeddedartists | 0:a771927a62fd | 4431 | } |
embeddedartists | 0:a771927a62fd | 4432 | |
embeddedartists | 0:a771927a62fd | 4433 | lodepng_free(key); |
embeddedartists | 0:a771927a62fd | 4434 | ucvector_cleanup(&decoded); |
embeddedartists | 0:a771927a62fd | 4435 | |
embeddedartists | 0:a771927a62fd | 4436 | return error; |
embeddedartists | 0:a771927a62fd | 4437 | } |
embeddedartists | 0:a771927a62fd | 4438 | |
embeddedartists | 0:a771927a62fd | 4439 | /*international text chunk (iTXt)*/ |
embeddedartists | 0:a771927a62fd | 4440 | static unsigned readChunk_iTXt(LodePNGInfo* info, const LodePNGDecompressSettings* zlibsettings, |
embeddedartists | 0:a771927a62fd | 4441 | const unsigned char* data, size_t chunkLength) |
embeddedartists | 0:a771927a62fd | 4442 | { |
embeddedartists | 0:a771927a62fd | 4443 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 4444 | unsigned i; |
embeddedartists | 0:a771927a62fd | 4445 | |
embeddedartists | 0:a771927a62fd | 4446 | unsigned length, begin, compressed; |
embeddedartists | 0:a771927a62fd | 4447 | char *key = 0, *langtag = 0, *transkey = 0; |
embeddedartists | 0:a771927a62fd | 4448 | ucvector decoded; |
embeddedartists | 0:a771927a62fd | 4449 | ucvector_init(&decoded); |
embeddedartists | 0:a771927a62fd | 4450 | |
embeddedartists | 0:a771927a62fd | 4451 | while(!error) /*not really a while loop, only used to break on error*/ |
embeddedartists | 0:a771927a62fd | 4452 | { |
embeddedartists | 0:a771927a62fd | 4453 | /*Quick check if the chunk length isn't too small. Even without check |
embeddedartists | 0:a771927a62fd | 4454 | it'd still fail with other error checks below if it's too short. This just gives a different error code.*/ |
embeddedartists | 0:a771927a62fd | 4455 | if(chunkLength < 5) CERROR_BREAK(error, 30); /*iTXt chunk too short*/ |
embeddedartists | 0:a771927a62fd | 4456 | |
embeddedartists | 0:a771927a62fd | 4457 | /*read the key*/ |
embeddedartists | 0:a771927a62fd | 4458 | for(length = 0; length < chunkLength && data[length] != 0; length++) ; |
embeddedartists | 0:a771927a62fd | 4459 | if(length + 3 >= chunkLength) CERROR_BREAK(error, 75); /*no null termination char, corrupt?*/ |
embeddedartists | 0:a771927a62fd | 4460 | if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/ |
embeddedartists | 0:a771927a62fd | 4461 | |
embeddedartists | 0:a771927a62fd | 4462 | key = (char*)lodepng_malloc(length + 1); |
embeddedartists | 0:a771927a62fd | 4463 | if(!key) CERROR_BREAK(error, 83); /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4464 | |
embeddedartists | 0:a771927a62fd | 4465 | key[length] = 0; |
embeddedartists | 0:a771927a62fd | 4466 | for(i = 0; i < length; i++) key[i] = data[i]; |
embeddedartists | 0:a771927a62fd | 4467 | |
embeddedartists | 0:a771927a62fd | 4468 | /*read the compression method*/ |
embeddedartists | 0:a771927a62fd | 4469 | compressed = data[length + 1]; |
embeddedartists | 0:a771927a62fd | 4470 | if(data[length + 2] != 0) CERROR_BREAK(error, 72); /*the 0 byte indicating compression must be 0*/ |
embeddedartists | 0:a771927a62fd | 4471 | |
embeddedartists | 0:a771927a62fd | 4472 | /*even though it's not allowed by the standard, no error is thrown if |
embeddedartists | 0:a771927a62fd | 4473 | there's no null termination char, if the text is empty for the next 3 texts*/ |
embeddedartists | 0:a771927a62fd | 4474 | |
embeddedartists | 0:a771927a62fd | 4475 | /*read the langtag*/ |
embeddedartists | 0:a771927a62fd | 4476 | begin = length + 3; |
embeddedartists | 0:a771927a62fd | 4477 | length = 0; |
embeddedartists | 0:a771927a62fd | 4478 | for(i = begin; i < chunkLength && data[i] != 0; i++) length++; |
embeddedartists | 0:a771927a62fd | 4479 | |
embeddedartists | 0:a771927a62fd | 4480 | langtag = (char*)lodepng_malloc(length + 1); |
embeddedartists | 0:a771927a62fd | 4481 | if(!langtag) CERROR_BREAK(error, 83); /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4482 | |
embeddedartists | 0:a771927a62fd | 4483 | langtag[length] = 0; |
embeddedartists | 0:a771927a62fd | 4484 | for(i = 0; i < length; i++) langtag[i] = data[begin + i]; |
embeddedartists | 0:a771927a62fd | 4485 | |
embeddedartists | 0:a771927a62fd | 4486 | /*read the transkey*/ |
embeddedartists | 0:a771927a62fd | 4487 | begin += length + 1; |
embeddedartists | 0:a771927a62fd | 4488 | length = 0; |
embeddedartists | 0:a771927a62fd | 4489 | for(i = begin; i < chunkLength && data[i] != 0; i++) length++; |
embeddedartists | 0:a771927a62fd | 4490 | |
embeddedartists | 0:a771927a62fd | 4491 | transkey = (char*)lodepng_malloc(length + 1); |
embeddedartists | 0:a771927a62fd | 4492 | if(!transkey) CERROR_BREAK(error, 83); /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4493 | |
embeddedartists | 0:a771927a62fd | 4494 | transkey[length] = 0; |
embeddedartists | 0:a771927a62fd | 4495 | for(i = 0; i < length; i++) transkey[i] = data[begin + i]; |
embeddedartists | 0:a771927a62fd | 4496 | |
embeddedartists | 0:a771927a62fd | 4497 | /*read the actual text*/ |
embeddedartists | 0:a771927a62fd | 4498 | begin += length + 1; |
embeddedartists | 0:a771927a62fd | 4499 | |
embeddedartists | 0:a771927a62fd | 4500 | length = chunkLength < begin ? 0 : chunkLength - begin; |
embeddedartists | 0:a771927a62fd | 4501 | |
embeddedartists | 0:a771927a62fd | 4502 | if(compressed) |
embeddedartists | 0:a771927a62fd | 4503 | { |
embeddedartists | 0:a771927a62fd | 4504 | /*will fail if zlib error, e.g. if length is too small*/ |
embeddedartists | 0:a771927a62fd | 4505 | error = zlib_decompress(&decoded.data, &decoded.size, |
embeddedartists | 0:a771927a62fd | 4506 | (unsigned char*)(&data[begin]), |
embeddedartists | 0:a771927a62fd | 4507 | length, zlibsettings); |
embeddedartists | 0:a771927a62fd | 4508 | if(error) break; |
embeddedartists | 0:a771927a62fd | 4509 | if(decoded.allocsize < decoded.size) decoded.allocsize = decoded.size; |
embeddedartists | 0:a771927a62fd | 4510 | ucvector_push_back(&decoded, 0); |
embeddedartists | 0:a771927a62fd | 4511 | } |
embeddedartists | 0:a771927a62fd | 4512 | else |
embeddedartists | 0:a771927a62fd | 4513 | { |
embeddedartists | 0:a771927a62fd | 4514 | if(!ucvector_resize(&decoded, length + 1)) CERROR_BREAK(error, 83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 4515 | |
embeddedartists | 0:a771927a62fd | 4516 | decoded.data[length] = 0; |
embeddedartists | 0:a771927a62fd | 4517 | for(i = 0; i < length; i++) decoded.data[i] = data[begin + i]; |
embeddedartists | 0:a771927a62fd | 4518 | } |
embeddedartists | 0:a771927a62fd | 4519 | |
embeddedartists | 0:a771927a62fd | 4520 | error = lodepng_add_itext(info, key, langtag, transkey, (char*)decoded.data); |
embeddedartists | 0:a771927a62fd | 4521 | |
embeddedartists | 0:a771927a62fd | 4522 | break; |
embeddedartists | 0:a771927a62fd | 4523 | } |
embeddedartists | 0:a771927a62fd | 4524 | |
embeddedartists | 0:a771927a62fd | 4525 | lodepng_free(key); |
embeddedartists | 0:a771927a62fd | 4526 | lodepng_free(langtag); |
embeddedartists | 0:a771927a62fd | 4527 | lodepng_free(transkey); |
embeddedartists | 0:a771927a62fd | 4528 | ucvector_cleanup(&decoded); |
embeddedartists | 0:a771927a62fd | 4529 | |
embeddedartists | 0:a771927a62fd | 4530 | return error; |
embeddedartists | 0:a771927a62fd | 4531 | } |
embeddedartists | 0:a771927a62fd | 4532 | |
embeddedartists | 0:a771927a62fd | 4533 | static unsigned readChunk_tIME(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) |
embeddedartists | 0:a771927a62fd | 4534 | { |
embeddedartists | 0:a771927a62fd | 4535 | if(chunkLength != 7) return 73; /*invalid tIME chunk size*/ |
embeddedartists | 0:a771927a62fd | 4536 | |
embeddedartists | 0:a771927a62fd | 4537 | info->time_defined = 1; |
embeddedartists | 0:a771927a62fd | 4538 | info->time.year = 256 * data[0] + data[+ 1]; |
embeddedartists | 0:a771927a62fd | 4539 | info->time.month = data[2]; |
embeddedartists | 0:a771927a62fd | 4540 | info->time.day = data[3]; |
embeddedartists | 0:a771927a62fd | 4541 | info->time.hour = data[4]; |
embeddedartists | 0:a771927a62fd | 4542 | info->time.minute = data[5]; |
embeddedartists | 0:a771927a62fd | 4543 | info->time.second = data[6]; |
embeddedartists | 0:a771927a62fd | 4544 | |
embeddedartists | 0:a771927a62fd | 4545 | return 0; /* OK */ |
embeddedartists | 0:a771927a62fd | 4546 | } |
embeddedartists | 0:a771927a62fd | 4547 | |
embeddedartists | 0:a771927a62fd | 4548 | static unsigned readChunk_pHYs(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) |
embeddedartists | 0:a771927a62fd | 4549 | { |
embeddedartists | 0:a771927a62fd | 4550 | if(chunkLength != 9) return 74; /*invalid pHYs chunk size*/ |
embeddedartists | 0:a771927a62fd | 4551 | |
embeddedartists | 0:a771927a62fd | 4552 | info->phys_defined = 1; |
embeddedartists | 0:a771927a62fd | 4553 | info->phys_x = 16777216 * data[0] + 65536 * data[1] + 256 * data[2] + data[3]; |
embeddedartists | 0:a771927a62fd | 4554 | info->phys_y = 16777216 * data[4] + 65536 * data[5] + 256 * data[6] + data[7]; |
embeddedartists | 0:a771927a62fd | 4555 | info->phys_unit = data[8]; |
embeddedartists | 0:a771927a62fd | 4556 | |
embeddedartists | 0:a771927a62fd | 4557 | return 0; /* OK */ |
embeddedartists | 0:a771927a62fd | 4558 | } |
embeddedartists | 0:a771927a62fd | 4559 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 4560 | |
embeddedartists | 0:a771927a62fd | 4561 | /*read a PNG, the result will be in the same color type as the PNG (hence "generic")*/ |
embeddedartists | 0:a771927a62fd | 4562 | static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, |
embeddedartists | 0:a771927a62fd | 4563 | LodePNGState* state, |
embeddedartists | 0:a771927a62fd | 4564 | const unsigned char* in, size_t insize) |
embeddedartists | 0:a771927a62fd | 4565 | { |
embeddedartists | 0:a771927a62fd | 4566 | unsigned char IEND = 0; |
embeddedartists | 0:a771927a62fd | 4567 | const unsigned char* chunk; |
embeddedartists | 0:a771927a62fd | 4568 | size_t i; |
embeddedartists | 0:a771927a62fd | 4569 | ucvector idat; /*the data from idat chunks*/ |
embeddedartists | 0:a771927a62fd | 4570 | ucvector scanlines; |
embeddedartists | 0:a771927a62fd | 4571 | |
embeddedartists | 0:a771927a62fd | 4572 | /*for unknown chunk order*/ |
embeddedartists | 0:a771927a62fd | 4573 | unsigned unknown = 0; |
embeddedartists | 0:a771927a62fd | 4574 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 4575 | unsigned critical_pos = 1; /*1 = after IHDR, 2 = after PLTE, 3 = after IDAT*/ |
embeddedartists | 0:a771927a62fd | 4576 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 4577 | |
embeddedartists | 0:a771927a62fd | 4578 | /*provide some proper output values if error will happen*/ |
embeddedartists | 0:a771927a62fd | 4579 | *out = 0; |
embeddedartists | 0:a771927a62fd | 4580 | |
embeddedartists | 0:a771927a62fd | 4581 | state->error = lodepng_inspect(w, h, state, in, insize); /*reads header and resets other parameters in state->info_png*/ |
embeddedartists | 0:a771927a62fd | 4582 | if(state->error) return; |
embeddedartists | 0:a771927a62fd | 4583 | |
embeddedartists | 0:a771927a62fd | 4584 | ucvector_init(&idat); |
embeddedartists | 0:a771927a62fd | 4585 | chunk = &in[33]; /*first byte of the first chunk after the header*/ |
embeddedartists | 0:a771927a62fd | 4586 | |
embeddedartists | 0:a771927a62fd | 4587 | /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. |
embeddedartists | 0:a771927a62fd | 4588 | IDAT data is put at the start of the in buffer*/ |
embeddedartists | 0:a771927a62fd | 4589 | while(!IEND && !state->error) |
embeddedartists | 0:a771927a62fd | 4590 | { |
embeddedartists | 0:a771927a62fd | 4591 | unsigned chunkLength; |
embeddedartists | 0:a771927a62fd | 4592 | const unsigned char* data; /*the data in the chunk*/ |
embeddedartists | 0:a771927a62fd | 4593 | |
embeddedartists | 0:a771927a62fd | 4594 | /*error: size of the in buffer too small to contain next chunk*/ |
embeddedartists | 0:a771927a62fd | 4595 | if((size_t)((chunk - in) + 12) > insize || chunk < in) CERROR_BREAK(state->error, 30); |
embeddedartists | 0:a771927a62fd | 4596 | |
embeddedartists | 0:a771927a62fd | 4597 | /*length of the data of the chunk, excluding the length bytes, chunk type and CRC bytes*/ |
embeddedartists | 0:a771927a62fd | 4598 | chunkLength = lodepng_chunk_length(chunk); |
embeddedartists | 0:a771927a62fd | 4599 | /*error: chunk length larger than the max PNG chunk size*/ |
embeddedartists | 0:a771927a62fd | 4600 | if(chunkLength > 2147483647) CERROR_BREAK(state->error, 63); |
embeddedartists | 0:a771927a62fd | 4601 | |
embeddedartists | 0:a771927a62fd | 4602 | if((size_t)((chunk - in) + chunkLength + 12) > insize || (chunk + chunkLength + 12) < in) |
embeddedartists | 0:a771927a62fd | 4603 | { |
embeddedartists | 0:a771927a62fd | 4604 | CERROR_BREAK(state->error, 64); /*error: size of the in buffer too small to contain next chunk*/ |
embeddedartists | 0:a771927a62fd | 4605 | } |
embeddedartists | 0:a771927a62fd | 4606 | |
embeddedartists | 0:a771927a62fd | 4607 | data = lodepng_chunk_data_const(chunk); |
embeddedartists | 0:a771927a62fd | 4608 | |
embeddedartists | 0:a771927a62fd | 4609 | /*IDAT chunk, containing compressed image data*/ |
embeddedartists | 0:a771927a62fd | 4610 | if(lodepng_chunk_type_equals(chunk, "IDAT")) |
embeddedartists | 0:a771927a62fd | 4611 | { |
embeddedartists | 0:a771927a62fd | 4612 | size_t oldsize = idat.size; |
embeddedartists | 0:a771927a62fd | 4613 | if(!ucvector_resize(&idat, oldsize + chunkLength)) CERROR_BREAK(state->error, 83 /*alloc fail*/); |
embeddedartists | 0:a771927a62fd | 4614 | for(i = 0; i < chunkLength; i++) idat.data[oldsize + i] = data[i]; |
embeddedartists | 0:a771927a62fd | 4615 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 4616 | critical_pos = 3; |
embeddedartists | 0:a771927a62fd | 4617 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 4618 | } |
embeddedartists | 0:a771927a62fd | 4619 | /*IEND chunk*/ |
embeddedartists | 0:a771927a62fd | 4620 | else if(lodepng_chunk_type_equals(chunk, "IEND")) |
embeddedartists | 0:a771927a62fd | 4621 | { |
embeddedartists | 0:a771927a62fd | 4622 | IEND = 1; |
embeddedartists | 0:a771927a62fd | 4623 | } |
embeddedartists | 0:a771927a62fd | 4624 | /*palette chunk (PLTE)*/ |
embeddedartists | 0:a771927a62fd | 4625 | else if(lodepng_chunk_type_equals(chunk, "PLTE")) |
embeddedartists | 0:a771927a62fd | 4626 | { |
embeddedartists | 0:a771927a62fd | 4627 | state->error = readChunk_PLTE(&state->info_png.color, data, chunkLength); |
embeddedartists | 0:a771927a62fd | 4628 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4629 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 4630 | critical_pos = 2; |
embeddedartists | 0:a771927a62fd | 4631 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 4632 | } |
embeddedartists | 0:a771927a62fd | 4633 | /*palette transparency chunk (tRNS)*/ |
embeddedartists | 0:a771927a62fd | 4634 | else if(lodepng_chunk_type_equals(chunk, "tRNS")) |
embeddedartists | 0:a771927a62fd | 4635 | { |
embeddedartists | 0:a771927a62fd | 4636 | state->error = readChunk_tRNS(&state->info_png.color, data, chunkLength); |
embeddedartists | 0:a771927a62fd | 4637 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4638 | } |
embeddedartists | 0:a771927a62fd | 4639 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 4640 | /*background color chunk (bKGD)*/ |
embeddedartists | 0:a771927a62fd | 4641 | else if(lodepng_chunk_type_equals(chunk, "bKGD")) |
embeddedartists | 0:a771927a62fd | 4642 | { |
embeddedartists | 0:a771927a62fd | 4643 | state->error = readChunk_bKGD(&state->info_png, data, chunkLength); |
embeddedartists | 0:a771927a62fd | 4644 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4645 | } |
embeddedartists | 0:a771927a62fd | 4646 | /*text chunk (tEXt)*/ |
embeddedartists | 0:a771927a62fd | 4647 | else if(lodepng_chunk_type_equals(chunk, "tEXt")) |
embeddedartists | 0:a771927a62fd | 4648 | { |
embeddedartists | 0:a771927a62fd | 4649 | if(state->decoder.read_text_chunks) |
embeddedartists | 0:a771927a62fd | 4650 | { |
embeddedartists | 0:a771927a62fd | 4651 | state->error = readChunk_tEXt(&state->info_png, data, chunkLength); |
embeddedartists | 0:a771927a62fd | 4652 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4653 | } |
embeddedartists | 0:a771927a62fd | 4654 | } |
embeddedartists | 0:a771927a62fd | 4655 | /*compressed text chunk (zTXt)*/ |
embeddedartists | 0:a771927a62fd | 4656 | else if(lodepng_chunk_type_equals(chunk, "zTXt")) |
embeddedartists | 0:a771927a62fd | 4657 | { |
embeddedartists | 0:a771927a62fd | 4658 | if(state->decoder.read_text_chunks) |
embeddedartists | 0:a771927a62fd | 4659 | { |
embeddedartists | 0:a771927a62fd | 4660 | state->error = readChunk_zTXt(&state->info_png, &state->decoder.zlibsettings, data, chunkLength); |
embeddedartists | 0:a771927a62fd | 4661 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4662 | } |
embeddedartists | 0:a771927a62fd | 4663 | } |
embeddedartists | 0:a771927a62fd | 4664 | /*international text chunk (iTXt)*/ |
embeddedartists | 0:a771927a62fd | 4665 | else if(lodepng_chunk_type_equals(chunk, "iTXt")) |
embeddedartists | 0:a771927a62fd | 4666 | { |
embeddedartists | 0:a771927a62fd | 4667 | if(state->decoder.read_text_chunks) |
embeddedartists | 0:a771927a62fd | 4668 | { |
embeddedartists | 0:a771927a62fd | 4669 | state->error = readChunk_iTXt(&state->info_png, &state->decoder.zlibsettings, data, chunkLength); |
embeddedartists | 0:a771927a62fd | 4670 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4671 | } |
embeddedartists | 0:a771927a62fd | 4672 | } |
embeddedartists | 0:a771927a62fd | 4673 | else if(lodepng_chunk_type_equals(chunk, "tIME")) |
embeddedartists | 0:a771927a62fd | 4674 | { |
embeddedartists | 0:a771927a62fd | 4675 | state->error = readChunk_tIME(&state->info_png, data, chunkLength); |
embeddedartists | 0:a771927a62fd | 4676 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4677 | } |
embeddedartists | 0:a771927a62fd | 4678 | else if(lodepng_chunk_type_equals(chunk, "pHYs")) |
embeddedartists | 0:a771927a62fd | 4679 | { |
embeddedartists | 0:a771927a62fd | 4680 | state->error = readChunk_pHYs(&state->info_png, data, chunkLength); |
embeddedartists | 0:a771927a62fd | 4681 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4682 | } |
embeddedartists | 0:a771927a62fd | 4683 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 4684 | else /*it's not an implemented chunk type, so ignore it: skip over the data*/ |
embeddedartists | 0:a771927a62fd | 4685 | { |
embeddedartists | 0:a771927a62fd | 4686 | /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/ |
embeddedartists | 0:a771927a62fd | 4687 | if(!lodepng_chunk_ancillary(chunk)) CERROR_BREAK(state->error, 69); |
embeddedartists | 0:a771927a62fd | 4688 | |
embeddedartists | 0:a771927a62fd | 4689 | unknown = 1; |
embeddedartists | 0:a771927a62fd | 4690 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 4691 | if(state->decoder.remember_unknown_chunks) |
embeddedartists | 0:a771927a62fd | 4692 | { |
embeddedartists | 0:a771927a62fd | 4693 | state->error = lodepng_chunk_append(&state->info_png.unknown_chunks_data[critical_pos - 1], |
embeddedartists | 0:a771927a62fd | 4694 | &state->info_png.unknown_chunks_size[critical_pos - 1], chunk); |
embeddedartists | 0:a771927a62fd | 4695 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 4696 | } |
embeddedartists | 0:a771927a62fd | 4697 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 4698 | } |
embeddedartists | 0:a771927a62fd | 4699 | |
embeddedartists | 0:a771927a62fd | 4700 | if(!state->decoder.ignore_crc && !unknown) /*check CRC if wanted, only on known chunk types*/ |
embeddedartists | 0:a771927a62fd | 4701 | { |
embeddedartists | 0:a771927a62fd | 4702 | if(lodepng_chunk_check_crc(chunk)) CERROR_BREAK(state->error, 57); /*invalid CRC*/ |
embeddedartists | 0:a771927a62fd | 4703 | } |
embeddedartists | 0:a771927a62fd | 4704 | |
embeddedartists | 0:a771927a62fd | 4705 | if(!IEND) chunk = lodepng_chunk_next_const(chunk); |
embeddedartists | 0:a771927a62fd | 4706 | } |
embeddedartists | 0:a771927a62fd | 4707 | |
embeddedartists | 0:a771927a62fd | 4708 | ucvector_init(&scanlines); |
embeddedartists | 0:a771927a62fd | 4709 | if(!state->error) |
embeddedartists | 0:a771927a62fd | 4710 | { |
embeddedartists | 0:a771927a62fd | 4711 | /*maximum final image length is already reserved in the vector's length - this is not really necessary*/ |
embeddedartists | 0:a771927a62fd | 4712 | if(!ucvector_resize(&scanlines, lodepng_get_raw_size(*w, *h, &state->info_png.color) + *h)) |
embeddedartists | 0:a771927a62fd | 4713 | { |
embeddedartists | 0:a771927a62fd | 4714 | state->error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4715 | } |
embeddedartists | 0:a771927a62fd | 4716 | } |
embeddedartists | 0:a771927a62fd | 4717 | if(!state->error) |
embeddedartists | 0:a771927a62fd | 4718 | { |
embeddedartists | 0:a771927a62fd | 4719 | /*decompress with the Zlib decompressor*/ |
embeddedartists | 0:a771927a62fd | 4720 | state->error = zlib_decompress(&scanlines.data, &scanlines.size, idat.data, |
embeddedartists | 0:a771927a62fd | 4721 | idat.size, &state->decoder.zlibsettings); |
embeddedartists | 0:a771927a62fd | 4722 | } |
embeddedartists | 0:a771927a62fd | 4723 | ucvector_cleanup(&idat); |
embeddedartists | 0:a771927a62fd | 4724 | |
embeddedartists | 0:a771927a62fd | 4725 | if(!state->error) |
embeddedartists | 0:a771927a62fd | 4726 | { |
embeddedartists | 0:a771927a62fd | 4727 | ucvector outv; |
embeddedartists | 0:a771927a62fd | 4728 | ucvector_init(&outv); |
embeddedartists | 0:a771927a62fd | 4729 | if(!ucvector_resizev(&outv, |
embeddedartists | 0:a771927a62fd | 4730 | lodepng_get_raw_size(*w, *h, &state->info_png.color), 0)) state->error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4731 | if(!state->error) state->error = postProcessScanlines(outv.data, scanlines.data, *w, *h, &state->info_png); |
embeddedartists | 0:a771927a62fd | 4732 | *out = outv.data; |
embeddedartists | 0:a771927a62fd | 4733 | } |
embeddedartists | 0:a771927a62fd | 4734 | ucvector_cleanup(&scanlines); |
embeddedartists | 0:a771927a62fd | 4735 | } |
embeddedartists | 0:a771927a62fd | 4736 | |
embeddedartists | 0:a771927a62fd | 4737 | unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, |
embeddedartists | 0:a771927a62fd | 4738 | LodePNGState* state, |
embeddedartists | 0:a771927a62fd | 4739 | const unsigned char* in, size_t insize) |
embeddedartists | 0:a771927a62fd | 4740 | { |
embeddedartists | 0:a771927a62fd | 4741 | *out = 0; |
embeddedartists | 0:a771927a62fd | 4742 | decodeGeneric(out, w, h, state, in, insize); |
embeddedartists | 0:a771927a62fd | 4743 | if(state->error) return state->error; |
embeddedartists | 0:a771927a62fd | 4744 | if(!state->decoder.color_convert || lodepng_color_mode_equal(&state->info_raw, &state->info_png.color)) |
embeddedartists | 0:a771927a62fd | 4745 | { |
embeddedartists | 0:a771927a62fd | 4746 | /*same color type, no copying or converting of data needed*/ |
embeddedartists | 0:a771927a62fd | 4747 | /*store the info_png color settings on the info_raw so that the info_raw still reflects what colortype |
embeddedartists | 0:a771927a62fd | 4748 | the raw image has to the end user*/ |
embeddedartists | 0:a771927a62fd | 4749 | if(!state->decoder.color_convert) |
embeddedartists | 0:a771927a62fd | 4750 | { |
embeddedartists | 0:a771927a62fd | 4751 | state->error = lodepng_color_mode_copy(&state->info_raw, &state->info_png.color); |
embeddedartists | 0:a771927a62fd | 4752 | if(state->error) return state->error; |
embeddedartists | 0:a771927a62fd | 4753 | } |
embeddedartists | 0:a771927a62fd | 4754 | } |
embeddedartists | 0:a771927a62fd | 4755 | else |
embeddedartists | 0:a771927a62fd | 4756 | { |
embeddedartists | 0:a771927a62fd | 4757 | /*color conversion needed; sort of copy of the data*/ |
embeddedartists | 0:a771927a62fd | 4758 | unsigned char* data = *out; |
embeddedartists | 0:a771927a62fd | 4759 | size_t outsize; |
embeddedartists | 0:a771927a62fd | 4760 | |
embeddedartists | 0:a771927a62fd | 4761 | /*TODO: check if this works according to the statement in the documentation: "The converter can convert |
embeddedartists | 0:a771927a62fd | 4762 | from greyscale input color type, to 8-bit greyscale or greyscale with alpha"*/ |
embeddedartists | 0:a771927a62fd | 4763 | if(!(state->info_raw.colortype == LCT_RGB || state->info_raw.colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 4764 | && !(state->info_raw.bitdepth == 8)) |
embeddedartists | 0:a771927a62fd | 4765 | { |
embeddedartists | 0:a771927a62fd | 4766 | return 56; /*unsupported color mode conversion*/ |
embeddedartists | 0:a771927a62fd | 4767 | } |
embeddedartists | 0:a771927a62fd | 4768 | |
embeddedartists | 0:a771927a62fd | 4769 | outsize = lodepng_get_raw_size(*w, *h, &state->info_raw); |
embeddedartists | 0:a771927a62fd | 4770 | *out = (unsigned char*)lodepng_malloc(outsize); |
embeddedartists | 0:a771927a62fd | 4771 | if(!(*out)) |
embeddedartists | 0:a771927a62fd | 4772 | { |
embeddedartists | 0:a771927a62fd | 4773 | state->error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 4774 | } |
embeddedartists | 0:a771927a62fd | 4775 | else state->error = lodepng_convert(*out, data, &state->info_raw, &state->info_png.color, *w, *h, state->decoder.fix_png); |
embeddedartists | 0:a771927a62fd | 4776 | lodepng_free(data); |
embeddedartists | 0:a771927a62fd | 4777 | } |
embeddedartists | 0:a771927a62fd | 4778 | return state->error; |
embeddedartists | 0:a771927a62fd | 4779 | } |
embeddedartists | 0:a771927a62fd | 4780 | |
embeddedartists | 0:a771927a62fd | 4781 | unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 4782 | size_t insize, LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 4783 | { |
embeddedartists | 0:a771927a62fd | 4784 | unsigned error; |
embeddedartists | 0:a771927a62fd | 4785 | LodePNGState state; |
embeddedartists | 0:a771927a62fd | 4786 | lodepng_state_init(&state); |
embeddedartists | 0:a771927a62fd | 4787 | state.info_raw.colortype = colortype; |
embeddedartists | 0:a771927a62fd | 4788 | state.info_raw.bitdepth = bitdepth; |
embeddedartists | 0:a771927a62fd | 4789 | error = lodepng_decode(out, w, h, &state, in, insize); |
embeddedartists | 0:a771927a62fd | 4790 | lodepng_state_cleanup(&state); |
embeddedartists | 0:a771927a62fd | 4791 | return error; |
embeddedartists | 0:a771927a62fd | 4792 | } |
embeddedartists | 0:a771927a62fd | 4793 | |
embeddedartists | 0:a771927a62fd | 4794 | unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) |
embeddedartists | 0:a771927a62fd | 4795 | { |
embeddedartists | 0:a771927a62fd | 4796 | return lodepng_decode_memory(out, w, h, in, insize, LCT_RGBA, 8); |
embeddedartists | 0:a771927a62fd | 4797 | } |
embeddedartists | 0:a771927a62fd | 4798 | |
embeddedartists | 0:a771927a62fd | 4799 | unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) |
embeddedartists | 0:a771927a62fd | 4800 | { |
embeddedartists | 0:a771927a62fd | 4801 | return lodepng_decode_memory(out, w, h, in, insize, LCT_RGB, 8); |
embeddedartists | 0:a771927a62fd | 4802 | } |
embeddedartists | 0:a771927a62fd | 4803 | |
embeddedartists | 0:a771927a62fd | 4804 | #ifdef LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 4805 | unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename, |
embeddedartists | 0:a771927a62fd | 4806 | LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 4807 | { |
embeddedartists | 0:a771927a62fd | 4808 | unsigned char* buffer; |
embeddedartists | 0:a771927a62fd | 4809 | size_t buffersize; |
embeddedartists | 0:a771927a62fd | 4810 | unsigned error; |
embeddedartists | 0:a771927a62fd | 4811 | error = lodepng_load_file(&buffer, &buffersize, filename); |
embeddedartists | 0:a771927a62fd | 4812 | if(!error) error = lodepng_decode_memory(out, w, h, buffer, buffersize, colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 4813 | lodepng_free(buffer); |
embeddedartists | 0:a771927a62fd | 4814 | return error; |
embeddedartists | 0:a771927a62fd | 4815 | } |
embeddedartists | 0:a771927a62fd | 4816 | |
embeddedartists | 0:a771927a62fd | 4817 | unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) |
embeddedartists | 0:a771927a62fd | 4818 | { |
embeddedartists | 0:a771927a62fd | 4819 | return lodepng_decode_file(out, w, h, filename, LCT_RGBA, 8); |
embeddedartists | 0:a771927a62fd | 4820 | } |
embeddedartists | 0:a771927a62fd | 4821 | |
embeddedartists | 0:a771927a62fd | 4822 | unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) |
embeddedartists | 0:a771927a62fd | 4823 | { |
embeddedartists | 0:a771927a62fd | 4824 | return lodepng_decode_file(out, w, h, filename, LCT_RGB, 8); |
embeddedartists | 0:a771927a62fd | 4825 | } |
embeddedartists | 0:a771927a62fd | 4826 | #endif /*LODEPNG_COMPILE_DISK*/ |
embeddedartists | 0:a771927a62fd | 4827 | |
embeddedartists | 0:a771927a62fd | 4828 | void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings) |
embeddedartists | 0:a771927a62fd | 4829 | { |
embeddedartists | 0:a771927a62fd | 4830 | settings->color_convert = 1; |
embeddedartists | 0:a771927a62fd | 4831 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 4832 | settings->read_text_chunks = 1; |
embeddedartists | 0:a771927a62fd | 4833 | settings->remember_unknown_chunks = 0; |
embeddedartists | 0:a771927a62fd | 4834 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 4835 | settings->ignore_crc = 0; |
embeddedartists | 0:a771927a62fd | 4836 | settings->fix_png = 0; |
embeddedartists | 0:a771927a62fd | 4837 | lodepng_decompress_settings_init(&settings->zlibsettings); |
embeddedartists | 0:a771927a62fd | 4838 | } |
embeddedartists | 0:a771927a62fd | 4839 | |
embeddedartists | 0:a771927a62fd | 4840 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 4841 | |
embeddedartists | 0:a771927a62fd | 4842 | #if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) |
embeddedartists | 0:a771927a62fd | 4843 | |
embeddedartists | 0:a771927a62fd | 4844 | void lodepng_state_init(LodePNGState* state) |
embeddedartists | 0:a771927a62fd | 4845 | { |
embeddedartists | 0:a771927a62fd | 4846 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 4847 | lodepng_decoder_settings_init(&state->decoder); |
embeddedartists | 0:a771927a62fd | 4848 | #endif /*LODEPNG_COMPILE_DECODER*/ |
embeddedartists | 0:a771927a62fd | 4849 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 4850 | lodepng_encoder_settings_init(&state->encoder); |
embeddedartists | 0:a771927a62fd | 4851 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 4852 | lodepng_color_mode_init(&state->info_raw); |
embeddedartists | 0:a771927a62fd | 4853 | lodepng_info_init(&state->info_png); |
embeddedartists | 0:a771927a62fd | 4854 | state->error = 1; |
embeddedartists | 0:a771927a62fd | 4855 | } |
embeddedartists | 0:a771927a62fd | 4856 | |
embeddedartists | 0:a771927a62fd | 4857 | void lodepng_state_cleanup(LodePNGState* state) |
embeddedartists | 0:a771927a62fd | 4858 | { |
embeddedartists | 0:a771927a62fd | 4859 | lodepng_color_mode_cleanup(&state->info_raw); |
embeddedartists | 0:a771927a62fd | 4860 | lodepng_info_cleanup(&state->info_png); |
embeddedartists | 0:a771927a62fd | 4861 | } |
embeddedartists | 0:a771927a62fd | 4862 | |
embeddedartists | 0:a771927a62fd | 4863 | void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source) |
embeddedartists | 0:a771927a62fd | 4864 | { |
embeddedartists | 0:a771927a62fd | 4865 | lodepng_state_cleanup(dest); |
embeddedartists | 0:a771927a62fd | 4866 | *dest = *source; |
embeddedartists | 0:a771927a62fd | 4867 | lodepng_color_mode_init(&dest->info_raw); |
embeddedartists | 0:a771927a62fd | 4868 | lodepng_info_init(&dest->info_png); |
embeddedartists | 0:a771927a62fd | 4869 | dest->error = lodepng_color_mode_copy(&dest->info_raw, &source->info_raw); if(dest->error) return; |
embeddedartists | 0:a771927a62fd | 4870 | dest->error = lodepng_info_copy(&dest->info_png, &source->info_png); if(dest->error) return; |
embeddedartists | 0:a771927a62fd | 4871 | } |
embeddedartists | 0:a771927a62fd | 4872 | |
embeddedartists | 0:a771927a62fd | 4873 | #endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */ |
embeddedartists | 0:a771927a62fd | 4874 | |
embeddedartists | 0:a771927a62fd | 4875 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 4876 | |
embeddedartists | 0:a771927a62fd | 4877 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 4878 | /* / PNG Encoder / */ |
embeddedartists | 0:a771927a62fd | 4879 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 4880 | |
embeddedartists | 0:a771927a62fd | 4881 | /*chunkName must be string of 4 characters*/ |
embeddedartists | 0:a771927a62fd | 4882 | static unsigned addChunk(ucvector* out, const char* chunkName, const unsigned char* data, size_t length) |
embeddedartists | 0:a771927a62fd | 4883 | { |
embeddedartists | 0:a771927a62fd | 4884 | CERROR_TRY_RETURN(lodepng_chunk_create(&out->data, &out->size, (unsigned)length, chunkName, data)); |
embeddedartists | 0:a771927a62fd | 4885 | out->allocsize = out->size; /*fix the allocsize again*/ |
embeddedartists | 0:a771927a62fd | 4886 | return 0; |
embeddedartists | 0:a771927a62fd | 4887 | } |
embeddedartists | 0:a771927a62fd | 4888 | |
embeddedartists | 0:a771927a62fd | 4889 | static void writeSignature(ucvector* out) |
embeddedartists | 0:a771927a62fd | 4890 | { |
embeddedartists | 0:a771927a62fd | 4891 | /*8 bytes PNG signature, aka the magic bytes*/ |
embeddedartists | 0:a771927a62fd | 4892 | ucvector_push_back(out, 137); |
embeddedartists | 0:a771927a62fd | 4893 | ucvector_push_back(out, 80); |
embeddedartists | 0:a771927a62fd | 4894 | ucvector_push_back(out, 78); |
embeddedartists | 0:a771927a62fd | 4895 | ucvector_push_back(out, 71); |
embeddedartists | 0:a771927a62fd | 4896 | ucvector_push_back(out, 13); |
embeddedartists | 0:a771927a62fd | 4897 | ucvector_push_back(out, 10); |
embeddedartists | 0:a771927a62fd | 4898 | ucvector_push_back(out, 26); |
embeddedartists | 0:a771927a62fd | 4899 | ucvector_push_back(out, 10); |
embeddedartists | 0:a771927a62fd | 4900 | } |
embeddedartists | 0:a771927a62fd | 4901 | |
embeddedartists | 0:a771927a62fd | 4902 | static unsigned addChunk_IHDR(ucvector* out, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 4903 | LodePNGColorType colortype, unsigned bitdepth, unsigned interlace_method) |
embeddedartists | 0:a771927a62fd | 4904 | { |
embeddedartists | 0:a771927a62fd | 4905 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 4906 | ucvector header; |
embeddedartists | 0:a771927a62fd | 4907 | ucvector_init(&header); |
embeddedartists | 0:a771927a62fd | 4908 | |
embeddedartists | 0:a771927a62fd | 4909 | lodepng_add32bitInt(&header, w); /*width*/ |
embeddedartists | 0:a771927a62fd | 4910 | lodepng_add32bitInt(&header, h); /*height*/ |
embeddedartists | 0:a771927a62fd | 4911 | ucvector_push_back(&header, (unsigned char)bitdepth); /*bit depth*/ |
embeddedartists | 0:a771927a62fd | 4912 | ucvector_push_back(&header, (unsigned char)colortype); /*color type*/ |
embeddedartists | 0:a771927a62fd | 4913 | ucvector_push_back(&header, 0); /*compression method*/ |
embeddedartists | 0:a771927a62fd | 4914 | ucvector_push_back(&header, 0); /*filter method*/ |
embeddedartists | 0:a771927a62fd | 4915 | ucvector_push_back(&header, interlace_method); /*interlace method*/ |
embeddedartists | 0:a771927a62fd | 4916 | |
embeddedartists | 0:a771927a62fd | 4917 | error = addChunk(out, "IHDR", header.data, header.size); |
embeddedartists | 0:a771927a62fd | 4918 | ucvector_cleanup(&header); |
embeddedartists | 0:a771927a62fd | 4919 | |
embeddedartists | 0:a771927a62fd | 4920 | return error; |
embeddedartists | 0:a771927a62fd | 4921 | } |
embeddedartists | 0:a771927a62fd | 4922 | |
embeddedartists | 0:a771927a62fd | 4923 | static unsigned addChunk_PLTE(ucvector* out, const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 4924 | { |
embeddedartists | 0:a771927a62fd | 4925 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 4926 | size_t i; |
embeddedartists | 0:a771927a62fd | 4927 | ucvector PLTE; |
embeddedartists | 0:a771927a62fd | 4928 | ucvector_init(&PLTE); |
embeddedartists | 0:a771927a62fd | 4929 | for(i = 0; i < info->palettesize * 4; i++) |
embeddedartists | 0:a771927a62fd | 4930 | { |
embeddedartists | 0:a771927a62fd | 4931 | /*add all channels except alpha channel*/ |
embeddedartists | 0:a771927a62fd | 4932 | if(i % 4 != 3) ucvector_push_back(&PLTE, info->palette[i]); |
embeddedartists | 0:a771927a62fd | 4933 | } |
embeddedartists | 0:a771927a62fd | 4934 | error = addChunk(out, "PLTE", PLTE.data, PLTE.size); |
embeddedartists | 0:a771927a62fd | 4935 | ucvector_cleanup(&PLTE); |
embeddedartists | 0:a771927a62fd | 4936 | |
embeddedartists | 0:a771927a62fd | 4937 | return error; |
embeddedartists | 0:a771927a62fd | 4938 | } |
embeddedartists | 0:a771927a62fd | 4939 | |
embeddedartists | 0:a771927a62fd | 4940 | static unsigned addChunk_tRNS(ucvector* out, const LodePNGColorMode* info) |
embeddedartists | 0:a771927a62fd | 4941 | { |
embeddedartists | 0:a771927a62fd | 4942 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 4943 | size_t i; |
embeddedartists | 0:a771927a62fd | 4944 | ucvector tRNS; |
embeddedartists | 0:a771927a62fd | 4945 | ucvector_init(&tRNS); |
embeddedartists | 0:a771927a62fd | 4946 | if(info->colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 4947 | { |
embeddedartists | 0:a771927a62fd | 4948 | size_t amount = info->palettesize; |
embeddedartists | 0:a771927a62fd | 4949 | /*the tail of palette values that all have 255 as alpha, does not have to be encoded*/ |
embeddedartists | 0:a771927a62fd | 4950 | for(i = info->palettesize; i > 0; i--) |
embeddedartists | 0:a771927a62fd | 4951 | { |
embeddedartists | 0:a771927a62fd | 4952 | if(info->palette[4 * (i - 1) + 3] == 255) amount--; |
embeddedartists | 0:a771927a62fd | 4953 | else break; |
embeddedartists | 0:a771927a62fd | 4954 | } |
embeddedartists | 0:a771927a62fd | 4955 | /*add only alpha channel*/ |
embeddedartists | 0:a771927a62fd | 4956 | for(i = 0; i < amount; i++) ucvector_push_back(&tRNS, info->palette[4 * i + 3]); |
embeddedartists | 0:a771927a62fd | 4957 | } |
embeddedartists | 0:a771927a62fd | 4958 | else if(info->colortype == LCT_GREY) |
embeddedartists | 0:a771927a62fd | 4959 | { |
embeddedartists | 0:a771927a62fd | 4960 | if(info->key_defined) |
embeddedartists | 0:a771927a62fd | 4961 | { |
embeddedartists | 0:a771927a62fd | 4962 | ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256)); |
embeddedartists | 0:a771927a62fd | 4963 | ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256)); |
embeddedartists | 0:a771927a62fd | 4964 | } |
embeddedartists | 0:a771927a62fd | 4965 | } |
embeddedartists | 0:a771927a62fd | 4966 | else if(info->colortype == LCT_RGB) |
embeddedartists | 0:a771927a62fd | 4967 | { |
embeddedartists | 0:a771927a62fd | 4968 | if(info->key_defined) |
embeddedartists | 0:a771927a62fd | 4969 | { |
embeddedartists | 0:a771927a62fd | 4970 | ucvector_push_back(&tRNS, (unsigned char)(info->key_r / 256)); |
embeddedartists | 0:a771927a62fd | 4971 | ucvector_push_back(&tRNS, (unsigned char)(info->key_r % 256)); |
embeddedartists | 0:a771927a62fd | 4972 | ucvector_push_back(&tRNS, (unsigned char)(info->key_g / 256)); |
embeddedartists | 0:a771927a62fd | 4973 | ucvector_push_back(&tRNS, (unsigned char)(info->key_g % 256)); |
embeddedartists | 0:a771927a62fd | 4974 | ucvector_push_back(&tRNS, (unsigned char)(info->key_b / 256)); |
embeddedartists | 0:a771927a62fd | 4975 | ucvector_push_back(&tRNS, (unsigned char)(info->key_b % 256)); |
embeddedartists | 0:a771927a62fd | 4976 | } |
embeddedartists | 0:a771927a62fd | 4977 | } |
embeddedartists | 0:a771927a62fd | 4978 | |
embeddedartists | 0:a771927a62fd | 4979 | error = addChunk(out, "tRNS", tRNS.data, tRNS.size); |
embeddedartists | 0:a771927a62fd | 4980 | ucvector_cleanup(&tRNS); |
embeddedartists | 0:a771927a62fd | 4981 | |
embeddedartists | 0:a771927a62fd | 4982 | return error; |
embeddedartists | 0:a771927a62fd | 4983 | } |
embeddedartists | 0:a771927a62fd | 4984 | |
embeddedartists | 0:a771927a62fd | 4985 | static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t datasize, |
embeddedartists | 0:a771927a62fd | 4986 | LodePNGCompressSettings* zlibsettings) |
embeddedartists | 0:a771927a62fd | 4987 | { |
embeddedartists | 0:a771927a62fd | 4988 | ucvector zlibdata; |
embeddedartists | 0:a771927a62fd | 4989 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 4990 | |
embeddedartists | 0:a771927a62fd | 4991 | /*compress with the Zlib compressor*/ |
embeddedartists | 0:a771927a62fd | 4992 | ucvector_init(&zlibdata); |
embeddedartists | 0:a771927a62fd | 4993 | error = zlib_compress(&zlibdata.data, &zlibdata.size, data, datasize, zlibsettings); |
embeddedartists | 0:a771927a62fd | 4994 | if(!error) error = addChunk(out, "IDAT", zlibdata.data, zlibdata.size); |
embeddedartists | 0:a771927a62fd | 4995 | ucvector_cleanup(&zlibdata); |
embeddedartists | 0:a771927a62fd | 4996 | |
embeddedartists | 0:a771927a62fd | 4997 | return error; |
embeddedartists | 0:a771927a62fd | 4998 | } |
embeddedartists | 0:a771927a62fd | 4999 | |
embeddedartists | 0:a771927a62fd | 5000 | static unsigned addChunk_IEND(ucvector* out) |
embeddedartists | 0:a771927a62fd | 5001 | { |
embeddedartists | 0:a771927a62fd | 5002 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5003 | error = addChunk(out, "IEND", 0, 0); |
embeddedartists | 0:a771927a62fd | 5004 | return error; |
embeddedartists | 0:a771927a62fd | 5005 | } |
embeddedartists | 0:a771927a62fd | 5006 | |
embeddedartists | 0:a771927a62fd | 5007 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 5008 | |
embeddedartists | 0:a771927a62fd | 5009 | static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring) |
embeddedartists | 0:a771927a62fd | 5010 | { |
embeddedartists | 0:a771927a62fd | 5011 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5012 | size_t i; |
embeddedartists | 0:a771927a62fd | 5013 | ucvector text; |
embeddedartists | 0:a771927a62fd | 5014 | ucvector_init(&text); |
embeddedartists | 0:a771927a62fd | 5015 | for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&text, (unsigned char)keyword[i]); |
embeddedartists | 0:a771927a62fd | 5016 | if(i < 1 || i > 79) return 89; /*error: invalid keyword size*/ |
embeddedartists | 0:a771927a62fd | 5017 | ucvector_push_back(&text, 0); /*0 termination char*/ |
embeddedartists | 0:a771927a62fd | 5018 | for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&text, (unsigned char)textstring[i]); |
embeddedartists | 0:a771927a62fd | 5019 | error = addChunk(out, "tEXt", text.data, text.size); |
embeddedartists | 0:a771927a62fd | 5020 | ucvector_cleanup(&text); |
embeddedartists | 0:a771927a62fd | 5021 | |
embeddedartists | 0:a771927a62fd | 5022 | return error; |
embeddedartists | 0:a771927a62fd | 5023 | } |
embeddedartists | 0:a771927a62fd | 5024 | |
embeddedartists | 0:a771927a62fd | 5025 | static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* textstring, |
embeddedartists | 0:a771927a62fd | 5026 | LodePNGCompressSettings* zlibsettings) |
embeddedartists | 0:a771927a62fd | 5027 | { |
embeddedartists | 0:a771927a62fd | 5028 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5029 | ucvector data, compressed; |
embeddedartists | 0:a771927a62fd | 5030 | size_t i, textsize = strlen(textstring); |
embeddedartists | 0:a771927a62fd | 5031 | |
embeddedartists | 0:a771927a62fd | 5032 | ucvector_init(&data); |
embeddedartists | 0:a771927a62fd | 5033 | ucvector_init(&compressed); |
embeddedartists | 0:a771927a62fd | 5034 | for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]); |
embeddedartists | 0:a771927a62fd | 5035 | if(i < 1 || i > 79) return 89; /*error: invalid keyword size*/ |
embeddedartists | 0:a771927a62fd | 5036 | ucvector_push_back(&data, 0); /*0 termination char*/ |
embeddedartists | 0:a771927a62fd | 5037 | ucvector_push_back(&data, 0); /*compression method: 0*/ |
embeddedartists | 0:a771927a62fd | 5038 | |
embeddedartists | 0:a771927a62fd | 5039 | error = zlib_compress(&compressed.data, &compressed.size, |
embeddedartists | 0:a771927a62fd | 5040 | (unsigned char*)textstring, textsize, zlibsettings); |
embeddedartists | 0:a771927a62fd | 5041 | if(!error) |
embeddedartists | 0:a771927a62fd | 5042 | { |
embeddedartists | 0:a771927a62fd | 5043 | for(i = 0; i < compressed.size; i++) ucvector_push_back(&data, compressed.data[i]); |
embeddedartists | 0:a771927a62fd | 5044 | error = addChunk(out, "zTXt", data.data, data.size); |
embeddedartists | 0:a771927a62fd | 5045 | } |
embeddedartists | 0:a771927a62fd | 5046 | |
embeddedartists | 0:a771927a62fd | 5047 | ucvector_cleanup(&compressed); |
embeddedartists | 0:a771927a62fd | 5048 | ucvector_cleanup(&data); |
embeddedartists | 0:a771927a62fd | 5049 | return error; |
embeddedartists | 0:a771927a62fd | 5050 | } |
embeddedartists | 0:a771927a62fd | 5051 | |
embeddedartists | 0:a771927a62fd | 5052 | static unsigned addChunk_iTXt(ucvector* out, unsigned compressed, const char* keyword, const char* langtag, |
embeddedartists | 0:a771927a62fd | 5053 | const char* transkey, const char* textstring, LodePNGCompressSettings* zlibsettings) |
embeddedartists | 0:a771927a62fd | 5054 | { |
embeddedartists | 0:a771927a62fd | 5055 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5056 | ucvector data; |
embeddedartists | 0:a771927a62fd | 5057 | size_t i, textsize = strlen(textstring); |
embeddedartists | 0:a771927a62fd | 5058 | |
embeddedartists | 0:a771927a62fd | 5059 | ucvector_init(&data); |
embeddedartists | 0:a771927a62fd | 5060 | |
embeddedartists | 0:a771927a62fd | 5061 | for(i = 0; keyword[i] != 0; i++) ucvector_push_back(&data, (unsigned char)keyword[i]); |
embeddedartists | 0:a771927a62fd | 5062 | if(i < 1 || i > 79) return 89; /*error: invalid keyword size*/ |
embeddedartists | 0:a771927a62fd | 5063 | ucvector_push_back(&data, 0); /*null termination char*/ |
embeddedartists | 0:a771927a62fd | 5064 | ucvector_push_back(&data, compressed ? 1 : 0); /*compression flag*/ |
embeddedartists | 0:a771927a62fd | 5065 | ucvector_push_back(&data, 0); /*compression method*/ |
embeddedartists | 0:a771927a62fd | 5066 | for(i = 0; langtag[i] != 0; i++) ucvector_push_back(&data, (unsigned char)langtag[i]); |
embeddedartists | 0:a771927a62fd | 5067 | ucvector_push_back(&data, 0); /*null termination char*/ |
embeddedartists | 0:a771927a62fd | 5068 | for(i = 0; transkey[i] != 0; i++) ucvector_push_back(&data, (unsigned char)transkey[i]); |
embeddedartists | 0:a771927a62fd | 5069 | ucvector_push_back(&data, 0); /*null termination char*/ |
embeddedartists | 0:a771927a62fd | 5070 | |
embeddedartists | 0:a771927a62fd | 5071 | if(compressed) |
embeddedartists | 0:a771927a62fd | 5072 | { |
embeddedartists | 0:a771927a62fd | 5073 | ucvector compressed_data; |
embeddedartists | 0:a771927a62fd | 5074 | ucvector_init(&compressed_data); |
embeddedartists | 0:a771927a62fd | 5075 | error = zlib_compress(&compressed_data.data, &compressed_data.size, |
embeddedartists | 0:a771927a62fd | 5076 | (unsigned char*)textstring, textsize, zlibsettings); |
embeddedartists | 0:a771927a62fd | 5077 | if(!error) |
embeddedartists | 0:a771927a62fd | 5078 | { |
embeddedartists | 0:a771927a62fd | 5079 | for(i = 0; i < compressed_data.size; i++) ucvector_push_back(&data, compressed_data.data[i]); |
embeddedartists | 0:a771927a62fd | 5080 | } |
embeddedartists | 0:a771927a62fd | 5081 | ucvector_cleanup(&compressed_data); |
embeddedartists | 0:a771927a62fd | 5082 | } |
embeddedartists | 0:a771927a62fd | 5083 | else /*not compressed*/ |
embeddedartists | 0:a771927a62fd | 5084 | { |
embeddedartists | 0:a771927a62fd | 5085 | for(i = 0; textstring[i] != 0; i++) ucvector_push_back(&data, (unsigned char)textstring[i]); |
embeddedartists | 0:a771927a62fd | 5086 | } |
embeddedartists | 0:a771927a62fd | 5087 | |
embeddedartists | 0:a771927a62fd | 5088 | if(!error) error = addChunk(out, "iTXt", data.data, data.size); |
embeddedartists | 0:a771927a62fd | 5089 | ucvector_cleanup(&data); |
embeddedartists | 0:a771927a62fd | 5090 | return error; |
embeddedartists | 0:a771927a62fd | 5091 | } |
embeddedartists | 0:a771927a62fd | 5092 | |
embeddedartists | 0:a771927a62fd | 5093 | static unsigned addChunk_bKGD(ucvector* out, const LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 5094 | { |
embeddedartists | 0:a771927a62fd | 5095 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5096 | ucvector bKGD; |
embeddedartists | 0:a771927a62fd | 5097 | ucvector_init(&bKGD); |
embeddedartists | 0:a771927a62fd | 5098 | if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) |
embeddedartists | 0:a771927a62fd | 5099 | { |
embeddedartists | 0:a771927a62fd | 5100 | ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256)); |
embeddedartists | 0:a771927a62fd | 5101 | ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); |
embeddedartists | 0:a771927a62fd | 5102 | } |
embeddedartists | 0:a771927a62fd | 5103 | else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) |
embeddedartists | 0:a771927a62fd | 5104 | { |
embeddedartists | 0:a771927a62fd | 5105 | ucvector_push_back(&bKGD, (unsigned char)(info->background_r / 256)); |
embeddedartists | 0:a771927a62fd | 5106 | ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); |
embeddedartists | 0:a771927a62fd | 5107 | ucvector_push_back(&bKGD, (unsigned char)(info->background_g / 256)); |
embeddedartists | 0:a771927a62fd | 5108 | ucvector_push_back(&bKGD, (unsigned char)(info->background_g % 256)); |
embeddedartists | 0:a771927a62fd | 5109 | ucvector_push_back(&bKGD, (unsigned char)(info->background_b / 256)); |
embeddedartists | 0:a771927a62fd | 5110 | ucvector_push_back(&bKGD, (unsigned char)(info->background_b % 256)); |
embeddedartists | 0:a771927a62fd | 5111 | } |
embeddedartists | 0:a771927a62fd | 5112 | else if(info->color.colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 5113 | { |
embeddedartists | 0:a771927a62fd | 5114 | ucvector_push_back(&bKGD, (unsigned char)(info->background_r % 256)); /*palette index*/ |
embeddedartists | 0:a771927a62fd | 5115 | } |
embeddedartists | 0:a771927a62fd | 5116 | |
embeddedartists | 0:a771927a62fd | 5117 | error = addChunk(out, "bKGD", bKGD.data, bKGD.size); |
embeddedartists | 0:a771927a62fd | 5118 | ucvector_cleanup(&bKGD); |
embeddedartists | 0:a771927a62fd | 5119 | |
embeddedartists | 0:a771927a62fd | 5120 | return error; |
embeddedartists | 0:a771927a62fd | 5121 | } |
embeddedartists | 0:a771927a62fd | 5122 | |
embeddedartists | 0:a771927a62fd | 5123 | static unsigned addChunk_tIME(ucvector* out, const LodePNGTime* time) |
embeddedartists | 0:a771927a62fd | 5124 | { |
embeddedartists | 0:a771927a62fd | 5125 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5126 | unsigned char* data = (unsigned char*)lodepng_malloc(7); |
embeddedartists | 0:a771927a62fd | 5127 | if(!data) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5128 | data[0] = (unsigned char)(time->year / 256); |
embeddedartists | 0:a771927a62fd | 5129 | data[1] = (unsigned char)(time->year % 256); |
embeddedartists | 0:a771927a62fd | 5130 | data[2] = time->month; |
embeddedartists | 0:a771927a62fd | 5131 | data[3] = time->day; |
embeddedartists | 0:a771927a62fd | 5132 | data[4] = time->hour; |
embeddedartists | 0:a771927a62fd | 5133 | data[5] = time->minute; |
embeddedartists | 0:a771927a62fd | 5134 | data[6] = time->second; |
embeddedartists | 0:a771927a62fd | 5135 | error = addChunk(out, "tIME", data, 7); |
embeddedartists | 0:a771927a62fd | 5136 | lodepng_free(data); |
embeddedartists | 0:a771927a62fd | 5137 | return error; |
embeddedartists | 0:a771927a62fd | 5138 | } |
embeddedartists | 0:a771927a62fd | 5139 | |
embeddedartists | 0:a771927a62fd | 5140 | static unsigned addChunk_pHYs(ucvector* out, const LodePNGInfo* info) |
embeddedartists | 0:a771927a62fd | 5141 | { |
embeddedartists | 0:a771927a62fd | 5142 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5143 | ucvector data; |
embeddedartists | 0:a771927a62fd | 5144 | ucvector_init(&data); |
embeddedartists | 0:a771927a62fd | 5145 | |
embeddedartists | 0:a771927a62fd | 5146 | lodepng_add32bitInt(&data, info->phys_x); |
embeddedartists | 0:a771927a62fd | 5147 | lodepng_add32bitInt(&data, info->phys_y); |
embeddedartists | 0:a771927a62fd | 5148 | ucvector_push_back(&data, info->phys_unit); |
embeddedartists | 0:a771927a62fd | 5149 | |
embeddedartists | 0:a771927a62fd | 5150 | error = addChunk(out, "pHYs", data.data, data.size); |
embeddedartists | 0:a771927a62fd | 5151 | ucvector_cleanup(&data); |
embeddedartists | 0:a771927a62fd | 5152 | |
embeddedartists | 0:a771927a62fd | 5153 | return error; |
embeddedartists | 0:a771927a62fd | 5154 | } |
embeddedartists | 0:a771927a62fd | 5155 | |
embeddedartists | 0:a771927a62fd | 5156 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 5157 | |
embeddedartists | 0:a771927a62fd | 5158 | static void filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline, |
embeddedartists | 0:a771927a62fd | 5159 | size_t length, size_t bytewidth, unsigned char filterType) |
embeddedartists | 0:a771927a62fd | 5160 | { |
embeddedartists | 0:a771927a62fd | 5161 | size_t i; |
embeddedartists | 0:a771927a62fd | 5162 | switch(filterType) |
embeddedartists | 0:a771927a62fd | 5163 | { |
embeddedartists | 0:a771927a62fd | 5164 | case 0: /*None*/ |
embeddedartists | 0:a771927a62fd | 5165 | for(i = 0; i < length; i++) out[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 5166 | break; |
embeddedartists | 0:a771927a62fd | 5167 | case 1: /*Sub*/ |
embeddedartists | 0:a771927a62fd | 5168 | if(prevline) |
embeddedartists | 0:a771927a62fd | 5169 | { |
embeddedartists | 0:a771927a62fd | 5170 | for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 5171 | for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth]; |
embeddedartists | 0:a771927a62fd | 5172 | } |
embeddedartists | 0:a771927a62fd | 5173 | else |
embeddedartists | 0:a771927a62fd | 5174 | { |
embeddedartists | 0:a771927a62fd | 5175 | for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 5176 | for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth]; |
embeddedartists | 0:a771927a62fd | 5177 | } |
embeddedartists | 0:a771927a62fd | 5178 | break; |
embeddedartists | 0:a771927a62fd | 5179 | case 2: /*Up*/ |
embeddedartists | 0:a771927a62fd | 5180 | if(prevline) |
embeddedartists | 0:a771927a62fd | 5181 | { |
embeddedartists | 0:a771927a62fd | 5182 | for(i = 0; i < length; i++) out[i] = scanline[i] - prevline[i]; |
embeddedartists | 0:a771927a62fd | 5183 | } |
embeddedartists | 0:a771927a62fd | 5184 | else |
embeddedartists | 0:a771927a62fd | 5185 | { |
embeddedartists | 0:a771927a62fd | 5186 | for(i = 0; i < length; i++) out[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 5187 | } |
embeddedartists | 0:a771927a62fd | 5188 | break; |
embeddedartists | 0:a771927a62fd | 5189 | case 3: /*Average*/ |
embeddedartists | 0:a771927a62fd | 5190 | if(prevline) |
embeddedartists | 0:a771927a62fd | 5191 | { |
embeddedartists | 0:a771927a62fd | 5192 | for(i = 0; i < bytewidth; i++) out[i] = scanline[i] - prevline[i] / 2; |
embeddedartists | 0:a771927a62fd | 5193 | for(i = bytewidth; i < length; i++) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) / 2); |
embeddedartists | 0:a771927a62fd | 5194 | } |
embeddedartists | 0:a771927a62fd | 5195 | else |
embeddedartists | 0:a771927a62fd | 5196 | { |
embeddedartists | 0:a771927a62fd | 5197 | for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 5198 | for(i = bytewidth; i < length; i++) out[i] = scanline[i] - scanline[i - bytewidth] / 2; |
embeddedartists | 0:a771927a62fd | 5199 | } |
embeddedartists | 0:a771927a62fd | 5200 | break; |
embeddedartists | 0:a771927a62fd | 5201 | case 4: /*Paeth*/ |
embeddedartists | 0:a771927a62fd | 5202 | if(prevline) |
embeddedartists | 0:a771927a62fd | 5203 | { |
embeddedartists | 0:a771927a62fd | 5204 | /*paethPredictor(0, prevline[i], 0) is always prevline[i]*/ |
embeddedartists | 0:a771927a62fd | 5205 | for(i = 0; i < bytewidth; i++) out[i] = (scanline[i] - prevline[i]); |
embeddedartists | 0:a771927a62fd | 5206 | for(i = bytewidth; i < length; i++) |
embeddedartists | 0:a771927a62fd | 5207 | { |
embeddedartists | 0:a771927a62fd | 5208 | out[i] = (scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidth])); |
embeddedartists | 0:a771927a62fd | 5209 | } |
embeddedartists | 0:a771927a62fd | 5210 | } |
embeddedartists | 0:a771927a62fd | 5211 | else |
embeddedartists | 0:a771927a62fd | 5212 | { |
embeddedartists | 0:a771927a62fd | 5213 | for(i = 0; i < bytewidth; i++) out[i] = scanline[i]; |
embeddedartists | 0:a771927a62fd | 5214 | /*paethPredictor(scanline[i - bytewidth], 0, 0) is always scanline[i - bytewidth]*/ |
embeddedartists | 0:a771927a62fd | 5215 | for(i = bytewidth; i < length; i++) out[i] = (scanline[i] - scanline[i - bytewidth]); |
embeddedartists | 0:a771927a62fd | 5216 | } |
embeddedartists | 0:a771927a62fd | 5217 | break; |
embeddedartists | 0:a771927a62fd | 5218 | default: return; /*unexisting filter type given*/ |
embeddedartists | 0:a771927a62fd | 5219 | } |
embeddedartists | 0:a771927a62fd | 5220 | } |
embeddedartists | 0:a771927a62fd | 5221 | |
embeddedartists | 0:a771927a62fd | 5222 | /* log2 approximation. A slight bit faster than std::log. */ |
embeddedartists | 0:a771927a62fd | 5223 | static float flog2(float f) |
embeddedartists | 0:a771927a62fd | 5224 | { |
embeddedartists | 0:a771927a62fd | 5225 | float result = 0; |
embeddedartists | 0:a771927a62fd | 5226 | while(f > 32) { result += 4; f /= 16; } |
embeddedartists | 0:a771927a62fd | 5227 | while(f > 2) { result++; f /= 2; } |
embeddedartists | 0:a771927a62fd | 5228 | return result + 1.442695f * (f * f * f / 3 - 3 * f * f / 2 + 3 * f - 1.83333f); |
embeddedartists | 0:a771927a62fd | 5229 | } |
embeddedartists | 0:a771927a62fd | 5230 | |
embeddedartists | 0:a771927a62fd | 5231 | static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 5232 | const LodePNGColorMode* info, const LodePNGEncoderSettings* settings) |
embeddedartists | 0:a771927a62fd | 5233 | { |
embeddedartists | 0:a771927a62fd | 5234 | /* |
embeddedartists | 0:a771927a62fd | 5235 | For PNG filter method 0 |
embeddedartists | 0:a771927a62fd | 5236 | out must be a buffer with as size: h + (w * h * bpp + 7) / 8, because there are |
embeddedartists | 0:a771927a62fd | 5237 | the scanlines with 1 extra byte per scanline |
embeddedartists | 0:a771927a62fd | 5238 | */ |
embeddedartists | 0:a771927a62fd | 5239 | |
embeddedartists | 0:a771927a62fd | 5240 | unsigned bpp = lodepng_get_bpp(info); |
embeddedartists | 0:a771927a62fd | 5241 | /*the width of a scanline in bytes, not including the filter type*/ |
embeddedartists | 0:a771927a62fd | 5242 | size_t linebytes = (w * bpp + 7) / 8; |
embeddedartists | 0:a771927a62fd | 5243 | /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ |
embeddedartists | 0:a771927a62fd | 5244 | size_t bytewidth = (bpp + 7) / 8; |
embeddedartists | 0:a771927a62fd | 5245 | const unsigned char* prevline = 0; |
embeddedartists | 0:a771927a62fd | 5246 | unsigned x, y; |
embeddedartists | 0:a771927a62fd | 5247 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5248 | LodePNGFilterStrategy strategy = settings->filter_strategy; |
embeddedartists | 0:a771927a62fd | 5249 | |
embeddedartists | 0:a771927a62fd | 5250 | /* |
embeddedartists | 0:a771927a62fd | 5251 | There is a heuristic called the minimum sum of absolute differences heuristic, suggested by the PNG standard: |
embeddedartists | 0:a771927a62fd | 5252 | * If the image type is Palette, or the bit depth is smaller than 8, then do not filter the image (i.e. |
embeddedartists | 0:a771927a62fd | 5253 | use fixed filtering, with the filter None). |
embeddedartists | 0:a771927a62fd | 5254 | * (The other case) If the image type is Grayscale or RGB (with or without Alpha), and the bit depth is |
embeddedartists | 0:a771927a62fd | 5255 | not smaller than 8, then use adaptive filtering heuristic as follows: independently for each row, apply |
embeddedartists | 0:a771927a62fd | 5256 | all five filters and select the filter that produces the smallest sum of absolute values per row. |
embeddedartists | 0:a771927a62fd | 5257 | This heuristic is used if filter strategy is LFS_MINSUM and filter_palette_zero is true. |
embeddedartists | 0:a771927a62fd | 5258 | |
embeddedartists | 0:a771927a62fd | 5259 | If filter_palette_zero is true and filter_strategy is not LFS_MINSUM, the above heuristic is followed, |
embeddedartists | 0:a771927a62fd | 5260 | but for "the other case", whatever strategy filter_strategy is set to instead of the minimum sum |
embeddedartists | 0:a771927a62fd | 5261 | heuristic is used. |
embeddedartists | 0:a771927a62fd | 5262 | */ |
embeddedartists | 0:a771927a62fd | 5263 | if(settings->filter_palette_zero && |
embeddedartists | 0:a771927a62fd | 5264 | (info->colortype == LCT_PALETTE || info->bitdepth < 8)) strategy = LFS_ZERO; |
embeddedartists | 0:a771927a62fd | 5265 | |
embeddedartists | 0:a771927a62fd | 5266 | if(bpp == 0) return 31; /*error: invalid color type*/ |
embeddedartists | 0:a771927a62fd | 5267 | |
embeddedartists | 0:a771927a62fd | 5268 | if(strategy == LFS_ZERO) |
embeddedartists | 0:a771927a62fd | 5269 | { |
embeddedartists | 0:a771927a62fd | 5270 | for(y = 0; y < h; y++) |
embeddedartists | 0:a771927a62fd | 5271 | { |
embeddedartists | 0:a771927a62fd | 5272 | size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ |
embeddedartists | 0:a771927a62fd | 5273 | size_t inindex = linebytes * y; |
embeddedartists | 0:a771927a62fd | 5274 | out[outindex] = 0; /*filter type byte*/ |
embeddedartists | 0:a771927a62fd | 5275 | filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, 0); |
embeddedartists | 0:a771927a62fd | 5276 | prevline = &in[inindex]; |
embeddedartists | 0:a771927a62fd | 5277 | } |
embeddedartists | 0:a771927a62fd | 5278 | } |
embeddedartists | 0:a771927a62fd | 5279 | else if(strategy == LFS_MINSUM) |
embeddedartists | 0:a771927a62fd | 5280 | { |
embeddedartists | 0:a771927a62fd | 5281 | /*adaptive filtering*/ |
embeddedartists | 0:a771927a62fd | 5282 | size_t sum[5]; |
embeddedartists | 0:a771927a62fd | 5283 | ucvector attempt[5]; /*five filtering attempts, one for each filter type*/ |
embeddedartists | 0:a771927a62fd | 5284 | size_t smallest = 0; |
embeddedartists | 0:a771927a62fd | 5285 | unsigned type, bestType = 0; |
embeddedartists | 0:a771927a62fd | 5286 | |
embeddedartists | 0:a771927a62fd | 5287 | for(type = 0; type < 5; type++) |
embeddedartists | 0:a771927a62fd | 5288 | { |
embeddedartists | 0:a771927a62fd | 5289 | ucvector_init(&attempt[type]); |
embeddedartists | 0:a771927a62fd | 5290 | if(!ucvector_resize(&attempt[type], linebytes)) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5291 | } |
embeddedartists | 0:a771927a62fd | 5292 | |
embeddedartists | 0:a771927a62fd | 5293 | if(!error) |
embeddedartists | 0:a771927a62fd | 5294 | { |
embeddedartists | 0:a771927a62fd | 5295 | for(y = 0; y < h; y++) |
embeddedartists | 0:a771927a62fd | 5296 | { |
embeddedartists | 0:a771927a62fd | 5297 | /*try the 5 filter types*/ |
embeddedartists | 0:a771927a62fd | 5298 | for(type = 0; type < 5; type++) |
embeddedartists | 0:a771927a62fd | 5299 | { |
embeddedartists | 0:a771927a62fd | 5300 | filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type); |
embeddedartists | 0:a771927a62fd | 5301 | |
embeddedartists | 0:a771927a62fd | 5302 | /*calculate the sum of the result*/ |
embeddedartists | 0:a771927a62fd | 5303 | sum[type] = 0; |
embeddedartists | 0:a771927a62fd | 5304 | if(type == 0) |
embeddedartists | 0:a771927a62fd | 5305 | { |
embeddedartists | 0:a771927a62fd | 5306 | for(x = 0; x < linebytes; x++) sum[type] += (unsigned char)(attempt[type].data[x]); |
embeddedartists | 0:a771927a62fd | 5307 | } |
embeddedartists | 0:a771927a62fd | 5308 | else |
embeddedartists | 0:a771927a62fd | 5309 | { |
embeddedartists | 0:a771927a62fd | 5310 | for(x = 0; x < linebytes; x++) |
embeddedartists | 0:a771927a62fd | 5311 | { |
embeddedartists | 0:a771927a62fd | 5312 | /*For differences, each byte should be treated as signed, values above 127 are negative |
embeddedartists | 0:a771927a62fd | 5313 | (converted to signed char). Filtertype 0 isn't a difference though, so use unsigned there. |
embeddedartists | 0:a771927a62fd | 5314 | This means filtertype 0 is almost never chosen, but that is justified.*/ |
embeddedartists | 0:a771927a62fd | 5315 | signed char s = (signed char)(attempt[type].data[x]); |
embeddedartists | 0:a771927a62fd | 5316 | sum[type] += s < 0 ? -s : s; |
embeddedartists | 0:a771927a62fd | 5317 | } |
embeddedartists | 0:a771927a62fd | 5318 | } |
embeddedartists | 0:a771927a62fd | 5319 | |
embeddedartists | 0:a771927a62fd | 5320 | /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/ |
embeddedartists | 0:a771927a62fd | 5321 | if(type == 0 || sum[type] < smallest) |
embeddedartists | 0:a771927a62fd | 5322 | { |
embeddedartists | 0:a771927a62fd | 5323 | bestType = type; |
embeddedartists | 0:a771927a62fd | 5324 | smallest = sum[type]; |
embeddedartists | 0:a771927a62fd | 5325 | } |
embeddedartists | 0:a771927a62fd | 5326 | } |
embeddedartists | 0:a771927a62fd | 5327 | |
embeddedartists | 0:a771927a62fd | 5328 | prevline = &in[y * linebytes]; |
embeddedartists | 0:a771927a62fd | 5329 | |
embeddedartists | 0:a771927a62fd | 5330 | /*now fill the out values*/ |
embeddedartists | 0:a771927a62fd | 5331 | out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ |
embeddedartists | 0:a771927a62fd | 5332 | for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x]; |
embeddedartists | 0:a771927a62fd | 5333 | } |
embeddedartists | 0:a771927a62fd | 5334 | } |
embeddedartists | 0:a771927a62fd | 5335 | |
embeddedartists | 0:a771927a62fd | 5336 | for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]); |
embeddedartists | 0:a771927a62fd | 5337 | } |
embeddedartists | 0:a771927a62fd | 5338 | else if(strategy == LFS_ENTROPY) |
embeddedartists | 0:a771927a62fd | 5339 | { |
embeddedartists | 0:a771927a62fd | 5340 | float sum[5]; |
embeddedartists | 0:a771927a62fd | 5341 | ucvector attempt[5]; /*five filtering attempts, one for each filter type*/ |
embeddedartists | 0:a771927a62fd | 5342 | float smallest = 0; |
embeddedartists | 0:a771927a62fd | 5343 | unsigned type, bestType = 0; |
embeddedartists | 0:a771927a62fd | 5344 | unsigned count[256]; |
embeddedartists | 0:a771927a62fd | 5345 | |
embeddedartists | 0:a771927a62fd | 5346 | for(type = 0; type < 5; type++) |
embeddedartists | 0:a771927a62fd | 5347 | { |
embeddedartists | 0:a771927a62fd | 5348 | ucvector_init(&attempt[type]); |
embeddedartists | 0:a771927a62fd | 5349 | if(!ucvector_resize(&attempt[type], linebytes)) return 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5350 | } |
embeddedartists | 0:a771927a62fd | 5351 | |
embeddedartists | 0:a771927a62fd | 5352 | for(y = 0; y < h; y++) |
embeddedartists | 0:a771927a62fd | 5353 | { |
embeddedartists | 0:a771927a62fd | 5354 | /*try the 5 filter types*/ |
embeddedartists | 0:a771927a62fd | 5355 | for(type = 0; type < 5; type++) |
embeddedartists | 0:a771927a62fd | 5356 | { |
embeddedartists | 0:a771927a62fd | 5357 | filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type); |
embeddedartists | 0:a771927a62fd | 5358 | for(x = 0; x < 256; x++) count[x] = 0; |
embeddedartists | 0:a771927a62fd | 5359 | for(x = 0; x < linebytes; x++) count[attempt[type].data[x]]++; |
embeddedartists | 0:a771927a62fd | 5360 | count[type]++; /*the filter type itself is part of the scanline*/ |
embeddedartists | 0:a771927a62fd | 5361 | sum[type] = 0; |
embeddedartists | 0:a771927a62fd | 5362 | for(x = 0; x < 256; x++) |
embeddedartists | 0:a771927a62fd | 5363 | { |
embeddedartists | 0:a771927a62fd | 5364 | float p = count[x] / (float)(linebytes + 1); |
embeddedartists | 0:a771927a62fd | 5365 | sum[type] += count[x] == 0 ? 0 : flog2(1 / p) * p; |
embeddedartists | 0:a771927a62fd | 5366 | } |
embeddedartists | 0:a771927a62fd | 5367 | /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/ |
embeddedartists | 0:a771927a62fd | 5368 | if(type == 0 || sum[type] < smallest) |
embeddedartists | 0:a771927a62fd | 5369 | { |
embeddedartists | 0:a771927a62fd | 5370 | bestType = type; |
embeddedartists | 0:a771927a62fd | 5371 | smallest = sum[type]; |
embeddedartists | 0:a771927a62fd | 5372 | } |
embeddedartists | 0:a771927a62fd | 5373 | } |
embeddedartists | 0:a771927a62fd | 5374 | |
embeddedartists | 0:a771927a62fd | 5375 | prevline = &in[y * linebytes]; |
embeddedartists | 0:a771927a62fd | 5376 | |
embeddedartists | 0:a771927a62fd | 5377 | /*now fill the out values*/ |
embeddedartists | 0:a771927a62fd | 5378 | out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ |
embeddedartists | 0:a771927a62fd | 5379 | for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x]; |
embeddedartists | 0:a771927a62fd | 5380 | } |
embeddedartists | 0:a771927a62fd | 5381 | |
embeddedartists | 0:a771927a62fd | 5382 | for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]); |
embeddedartists | 0:a771927a62fd | 5383 | } |
embeddedartists | 0:a771927a62fd | 5384 | else if(strategy == LFS_PREDEFINED) |
embeddedartists | 0:a771927a62fd | 5385 | { |
embeddedartists | 0:a771927a62fd | 5386 | for(y = 0; y < h; y++) |
embeddedartists | 0:a771927a62fd | 5387 | { |
embeddedartists | 0:a771927a62fd | 5388 | size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ |
embeddedartists | 0:a771927a62fd | 5389 | size_t inindex = linebytes * y; |
embeddedartists | 0:a771927a62fd | 5390 | unsigned type = settings->predefined_filters[y]; |
embeddedartists | 0:a771927a62fd | 5391 | out[outindex] = type; /*filter type byte*/ |
embeddedartists | 0:a771927a62fd | 5392 | filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type); |
embeddedartists | 0:a771927a62fd | 5393 | prevline = &in[inindex]; |
embeddedartists | 0:a771927a62fd | 5394 | } |
embeddedartists | 0:a771927a62fd | 5395 | } |
embeddedartists | 0:a771927a62fd | 5396 | else if(strategy == LFS_BRUTE_FORCE) |
embeddedartists | 0:a771927a62fd | 5397 | { |
embeddedartists | 0:a771927a62fd | 5398 | /*brute force filter chooser. |
embeddedartists | 0:a771927a62fd | 5399 | deflate the scanline after every filter attempt to see which one deflates best. |
embeddedartists | 0:a771927a62fd | 5400 | This is very slow and gives only slightly smaller, sometimes even larger, result*/ |
embeddedartists | 0:a771927a62fd | 5401 | size_t size[5]; |
embeddedartists | 0:a771927a62fd | 5402 | ucvector attempt[5]; /*five filtering attempts, one for each filter type*/ |
embeddedartists | 0:a771927a62fd | 5403 | size_t smallest = 0; |
embeddedartists | 0:a771927a62fd | 5404 | unsigned type = 0, bestType = 0; |
embeddedartists | 0:a771927a62fd | 5405 | unsigned char* dummy; |
embeddedartists | 0:a771927a62fd | 5406 | LodePNGCompressSettings zlibsettings = settings->zlibsettings; |
embeddedartists | 0:a771927a62fd | 5407 | /*use fixed tree on the attempts so that the tree is not adapted to the filtertype on purpose, |
embeddedartists | 0:a771927a62fd | 5408 | to simulate the true case where the tree is the same for the whole image. Sometimes it gives |
embeddedartists | 0:a771927a62fd | 5409 | better result with dynamic tree anyway. Using the fixed tree sometimes gives worse, but in rare |
embeddedartists | 0:a771927a62fd | 5410 | cases better compression. It does make this a bit less slow, so it's worth doing this.*/ |
embeddedartists | 0:a771927a62fd | 5411 | zlibsettings.btype = 1; |
embeddedartists | 0:a771927a62fd | 5412 | /*a custom encoder likely doesn't read the btype setting and is optimized for complete PNG |
embeddedartists | 0:a771927a62fd | 5413 | images only, so disable it*/ |
embeddedartists | 0:a771927a62fd | 5414 | zlibsettings.custom_zlib = 0; |
embeddedartists | 0:a771927a62fd | 5415 | zlibsettings.custom_deflate = 0; |
embeddedartists | 0:a771927a62fd | 5416 | for(type = 0; type < 5; type++) |
embeddedartists | 0:a771927a62fd | 5417 | { |
embeddedartists | 0:a771927a62fd | 5418 | ucvector_init(&attempt[type]); |
embeddedartists | 0:a771927a62fd | 5419 | ucvector_resize(&attempt[type], linebytes); /*todo: give error if resize failed*/ |
embeddedartists | 0:a771927a62fd | 5420 | } |
embeddedartists | 0:a771927a62fd | 5421 | for(y = 0; y < h; y++) /*try the 5 filter types*/ |
embeddedartists | 0:a771927a62fd | 5422 | { |
embeddedartists | 0:a771927a62fd | 5423 | for(type = 0; type < 5; type++) |
embeddedartists | 0:a771927a62fd | 5424 | { |
embeddedartists | 0:a771927a62fd | 5425 | unsigned testsize = attempt[type].size; |
embeddedartists | 0:a771927a62fd | 5426 | /*if(testsize > 8) testsize /= 8;*/ /*it already works good enough by testing a part of the row*/ |
embeddedartists | 0:a771927a62fd | 5427 | |
embeddedartists | 0:a771927a62fd | 5428 | filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type); |
embeddedartists | 0:a771927a62fd | 5429 | size[type] = 0; |
embeddedartists | 0:a771927a62fd | 5430 | dummy = 0; |
embeddedartists | 0:a771927a62fd | 5431 | zlib_compress(&dummy, &size[type], attempt[type].data, testsize, &zlibsettings); |
embeddedartists | 0:a771927a62fd | 5432 | lodepng_free(dummy); |
embeddedartists | 0:a771927a62fd | 5433 | /*check if this is smallest size (or if type == 0 it's the first case so always store the values)*/ |
embeddedartists | 0:a771927a62fd | 5434 | if(type == 0 || size[type] < smallest) |
embeddedartists | 0:a771927a62fd | 5435 | { |
embeddedartists | 0:a771927a62fd | 5436 | bestType = type; |
embeddedartists | 0:a771927a62fd | 5437 | smallest = size[type]; |
embeddedartists | 0:a771927a62fd | 5438 | } |
embeddedartists | 0:a771927a62fd | 5439 | } |
embeddedartists | 0:a771927a62fd | 5440 | prevline = &in[y * linebytes]; |
embeddedartists | 0:a771927a62fd | 5441 | out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ |
embeddedartists | 0:a771927a62fd | 5442 | for(x = 0; x < linebytes; x++) out[y * (linebytes + 1) + 1 + x] = attempt[bestType].data[x]; |
embeddedartists | 0:a771927a62fd | 5443 | } |
embeddedartists | 0:a771927a62fd | 5444 | for(type = 0; type < 5; type++) ucvector_cleanup(&attempt[type]); |
embeddedartists | 0:a771927a62fd | 5445 | } |
embeddedartists | 0:a771927a62fd | 5446 | else return 88; /* unknown filter strategy */ |
embeddedartists | 0:a771927a62fd | 5447 | |
embeddedartists | 0:a771927a62fd | 5448 | return error; |
embeddedartists | 0:a771927a62fd | 5449 | } |
embeddedartists | 0:a771927a62fd | 5450 | |
embeddedartists | 0:a771927a62fd | 5451 | static void addPaddingBits(unsigned char* out, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 5452 | size_t olinebits, size_t ilinebits, unsigned h) |
embeddedartists | 0:a771927a62fd | 5453 | { |
embeddedartists | 0:a771927a62fd | 5454 | /*The opposite of the removePaddingBits function |
embeddedartists | 0:a771927a62fd | 5455 | olinebits must be >= ilinebits*/ |
embeddedartists | 0:a771927a62fd | 5456 | unsigned y; |
embeddedartists | 0:a771927a62fd | 5457 | size_t diff = olinebits - ilinebits; |
embeddedartists | 0:a771927a62fd | 5458 | size_t obp = 0, ibp = 0; /*bit pointers*/ |
embeddedartists | 0:a771927a62fd | 5459 | for(y = 0; y < h; y++) |
embeddedartists | 0:a771927a62fd | 5460 | { |
embeddedartists | 0:a771927a62fd | 5461 | size_t x; |
embeddedartists | 0:a771927a62fd | 5462 | for(x = 0; x < ilinebits; x++) |
embeddedartists | 0:a771927a62fd | 5463 | { |
embeddedartists | 0:a771927a62fd | 5464 | unsigned char bit = readBitFromReversedStream(&ibp, in); |
embeddedartists | 0:a771927a62fd | 5465 | setBitOfReversedStream(&obp, out, bit); |
embeddedartists | 0:a771927a62fd | 5466 | } |
embeddedartists | 0:a771927a62fd | 5467 | /*obp += diff; --> no, fill in some value in the padding bits too, to avoid |
embeddedartists | 0:a771927a62fd | 5468 | "Use of uninitialised value of size ###" warning from valgrind*/ |
embeddedartists | 0:a771927a62fd | 5469 | for(x = 0; x < diff; x++) setBitOfReversedStream(&obp, out, 0); |
embeddedartists | 0:a771927a62fd | 5470 | } |
embeddedartists | 0:a771927a62fd | 5471 | } |
embeddedartists | 0:a771927a62fd | 5472 | |
embeddedartists | 0:a771927a62fd | 5473 | /* |
embeddedartists | 0:a771927a62fd | 5474 | in: non-interlaced image with size w*h |
embeddedartists | 0:a771927a62fd | 5475 | out: the same pixels, but re-ordered according to PNG's Adam7 interlacing, with |
embeddedartists | 0:a771927a62fd | 5476 | no padding bits between scanlines, but between reduced images so that each |
embeddedartists | 0:a771927a62fd | 5477 | reduced image starts at a byte. |
embeddedartists | 0:a771927a62fd | 5478 | bpp: bits per pixel |
embeddedartists | 0:a771927a62fd | 5479 | there are no padding bits, not between scanlines, not between reduced images |
embeddedartists | 0:a771927a62fd | 5480 | in has the following size in bits: w * h * bpp. |
embeddedartists | 0:a771927a62fd | 5481 | out is possibly bigger due to padding bits between reduced images |
embeddedartists | 0:a771927a62fd | 5482 | NOTE: comments about padding bits are only relevant if bpp < 8 |
embeddedartists | 0:a771927a62fd | 5483 | */ |
embeddedartists | 0:a771927a62fd | 5484 | static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) |
embeddedartists | 0:a771927a62fd | 5485 | { |
embeddedartists | 0:a771927a62fd | 5486 | unsigned passw[7], passh[7]; |
embeddedartists | 0:a771927a62fd | 5487 | size_t filter_passstart[8], padded_passstart[8], passstart[8]; |
embeddedartists | 0:a771927a62fd | 5488 | unsigned i; |
embeddedartists | 0:a771927a62fd | 5489 | |
embeddedartists | 0:a771927a62fd | 5490 | Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); |
embeddedartists | 0:a771927a62fd | 5491 | |
embeddedartists | 0:a771927a62fd | 5492 | if(bpp >= 8) |
embeddedartists | 0:a771927a62fd | 5493 | { |
embeddedartists | 0:a771927a62fd | 5494 | for(i = 0; i < 7; i++) |
embeddedartists | 0:a771927a62fd | 5495 | { |
embeddedartists | 0:a771927a62fd | 5496 | unsigned x, y, b; |
embeddedartists | 0:a771927a62fd | 5497 | size_t bytewidth = bpp / 8; |
embeddedartists | 0:a771927a62fd | 5498 | for(y = 0; y < passh[i]; y++) |
embeddedartists | 0:a771927a62fd | 5499 | for(x = 0; x < passw[i]; x++) |
embeddedartists | 0:a771927a62fd | 5500 | { |
embeddedartists | 0:a771927a62fd | 5501 | size_t pixelinstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; |
embeddedartists | 0:a771927a62fd | 5502 | size_t pixeloutstart = passstart[i] + (y * passw[i] + x) * bytewidth; |
embeddedartists | 0:a771927a62fd | 5503 | for(b = 0; b < bytewidth; b++) |
embeddedartists | 0:a771927a62fd | 5504 | { |
embeddedartists | 0:a771927a62fd | 5505 | out[pixeloutstart + b] = in[pixelinstart + b]; |
embeddedartists | 0:a771927a62fd | 5506 | } |
embeddedartists | 0:a771927a62fd | 5507 | } |
embeddedartists | 0:a771927a62fd | 5508 | } |
embeddedartists | 0:a771927a62fd | 5509 | } |
embeddedartists | 0:a771927a62fd | 5510 | else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ |
embeddedartists | 0:a771927a62fd | 5511 | { |
embeddedartists | 0:a771927a62fd | 5512 | for(i = 0; i < 7; i++) |
embeddedartists | 0:a771927a62fd | 5513 | { |
embeddedartists | 0:a771927a62fd | 5514 | unsigned x, y, b; |
embeddedartists | 0:a771927a62fd | 5515 | unsigned ilinebits = bpp * passw[i]; |
embeddedartists | 0:a771927a62fd | 5516 | unsigned olinebits = bpp * w; |
embeddedartists | 0:a771927a62fd | 5517 | size_t obp, ibp; /*bit pointers (for out and in buffer)*/ |
embeddedartists | 0:a771927a62fd | 5518 | for(y = 0; y < passh[i]; y++) |
embeddedartists | 0:a771927a62fd | 5519 | for(x = 0; x < passw[i]; x++) |
embeddedartists | 0:a771927a62fd | 5520 | { |
embeddedartists | 0:a771927a62fd | 5521 | ibp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; |
embeddedartists | 0:a771927a62fd | 5522 | obp = (8 * passstart[i]) + (y * ilinebits + x * bpp); |
embeddedartists | 0:a771927a62fd | 5523 | for(b = 0; b < bpp; b++) |
embeddedartists | 0:a771927a62fd | 5524 | { |
embeddedartists | 0:a771927a62fd | 5525 | unsigned char bit = readBitFromReversedStream(&ibp, in); |
embeddedartists | 0:a771927a62fd | 5526 | setBitOfReversedStream(&obp, out, bit); |
embeddedartists | 0:a771927a62fd | 5527 | } |
embeddedartists | 0:a771927a62fd | 5528 | } |
embeddedartists | 0:a771927a62fd | 5529 | } |
embeddedartists | 0:a771927a62fd | 5530 | } |
embeddedartists | 0:a771927a62fd | 5531 | } |
embeddedartists | 0:a771927a62fd | 5532 | |
embeddedartists | 0:a771927a62fd | 5533 | /*out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image. |
embeddedartists | 0:a771927a62fd | 5534 | return value is error**/ |
embeddedartists | 0:a771927a62fd | 5535 | static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 5536 | unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 5537 | const LodePNGInfo* info_png, const LodePNGEncoderSettings* settings) |
embeddedartists | 0:a771927a62fd | 5538 | { |
embeddedartists | 0:a771927a62fd | 5539 | /* |
embeddedartists | 0:a771927a62fd | 5540 | This function converts the pure 2D image with the PNG's colortype, into filtered-padded-interlaced data. Steps: |
embeddedartists | 0:a771927a62fd | 5541 | *) if no Adam7: 1) add padding bits (= posible extra bits per scanline if bpp < 8) 2) filter |
embeddedartists | 0:a771927a62fd | 5542 | *) if adam7: 1) Adam7_interlace 2) 7x add padding bits 3) 7x filter |
embeddedartists | 0:a771927a62fd | 5543 | */ |
embeddedartists | 0:a771927a62fd | 5544 | unsigned bpp = lodepng_get_bpp(&info_png->color); |
embeddedartists | 0:a771927a62fd | 5545 | unsigned error = 0; |
embeddedartists | 0:a771927a62fd | 5546 | |
embeddedartists | 0:a771927a62fd | 5547 | if(info_png->interlace_method == 0) |
embeddedartists | 0:a771927a62fd | 5548 | { |
embeddedartists | 0:a771927a62fd | 5549 | *outsize = h + (h * ((w * bpp + 7) / 8)); /*image size plus an extra byte per scanline + possible padding bits*/ |
embeddedartists | 0:a771927a62fd | 5550 | *out = (unsigned char*)lodepng_malloc(*outsize); |
embeddedartists | 0:a771927a62fd | 5551 | if(!(*out) && (*outsize)) error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5552 | |
embeddedartists | 0:a771927a62fd | 5553 | if(!error) |
embeddedartists | 0:a771927a62fd | 5554 | { |
embeddedartists | 0:a771927a62fd | 5555 | /*non multiple of 8 bits per scanline, padding bits needed per scanline*/ |
embeddedartists | 0:a771927a62fd | 5556 | if(bpp < 8 && w * bpp != ((w * bpp + 7) / 8) * 8) |
embeddedartists | 0:a771927a62fd | 5557 | { |
embeddedartists | 0:a771927a62fd | 5558 | unsigned char* padded = (unsigned char*)lodepng_malloc(h * ((w * bpp + 7) / 8)); |
embeddedartists | 0:a771927a62fd | 5559 | if(!padded) error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5560 | if(!error) |
embeddedartists | 0:a771927a62fd | 5561 | { |
embeddedartists | 0:a771927a62fd | 5562 | addPaddingBits(padded, in, ((w * bpp + 7) / 8) * 8, w * bpp, h); |
embeddedartists | 0:a771927a62fd | 5563 | error = filter(*out, padded, w, h, &info_png->color, settings); |
embeddedartists | 0:a771927a62fd | 5564 | } |
embeddedartists | 0:a771927a62fd | 5565 | lodepng_free(padded); |
embeddedartists | 0:a771927a62fd | 5566 | } |
embeddedartists | 0:a771927a62fd | 5567 | else |
embeddedartists | 0:a771927a62fd | 5568 | { |
embeddedartists | 0:a771927a62fd | 5569 | /*we can immediatly filter into the out buffer, no other steps needed*/ |
embeddedartists | 0:a771927a62fd | 5570 | error = filter(*out, in, w, h, &info_png->color, settings); |
embeddedartists | 0:a771927a62fd | 5571 | } |
embeddedartists | 0:a771927a62fd | 5572 | } |
embeddedartists | 0:a771927a62fd | 5573 | } |
embeddedartists | 0:a771927a62fd | 5574 | else /*interlace_method is 1 (Adam7)*/ |
embeddedartists | 0:a771927a62fd | 5575 | { |
embeddedartists | 0:a771927a62fd | 5576 | unsigned passw[7], passh[7]; |
embeddedartists | 0:a771927a62fd | 5577 | size_t filter_passstart[8], padded_passstart[8], passstart[8]; |
embeddedartists | 0:a771927a62fd | 5578 | unsigned char* adam7; |
embeddedartists | 0:a771927a62fd | 5579 | |
embeddedartists | 0:a771927a62fd | 5580 | Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); |
embeddedartists | 0:a771927a62fd | 5581 | |
embeddedartists | 0:a771927a62fd | 5582 | *outsize = filter_passstart[7]; /*image size plus an extra byte per scanline + possible padding bits*/ |
embeddedartists | 0:a771927a62fd | 5583 | *out = (unsigned char*)lodepng_malloc(*outsize); |
embeddedartists | 0:a771927a62fd | 5584 | if(!(*out)) error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5585 | |
embeddedartists | 0:a771927a62fd | 5586 | adam7 = (unsigned char*)lodepng_malloc(passstart[7]); |
embeddedartists | 0:a771927a62fd | 5587 | if(!adam7 && passstart[7]) error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5588 | |
embeddedartists | 0:a771927a62fd | 5589 | if(!error) |
embeddedartists | 0:a771927a62fd | 5590 | { |
embeddedartists | 0:a771927a62fd | 5591 | unsigned i; |
embeddedartists | 0:a771927a62fd | 5592 | |
embeddedartists | 0:a771927a62fd | 5593 | Adam7_interlace(adam7, in, w, h, bpp); |
embeddedartists | 0:a771927a62fd | 5594 | for(i = 0; i < 7; i++) |
embeddedartists | 0:a771927a62fd | 5595 | { |
embeddedartists | 0:a771927a62fd | 5596 | if(bpp < 8) |
embeddedartists | 0:a771927a62fd | 5597 | { |
embeddedartists | 0:a771927a62fd | 5598 | unsigned char* padded = (unsigned char*)lodepng_malloc(padded_passstart[i + 1] - padded_passstart[i]); |
embeddedartists | 0:a771927a62fd | 5599 | if(!padded) ERROR_BREAK(83); /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5600 | addPaddingBits(padded, &adam7[passstart[i]], |
embeddedartists | 0:a771927a62fd | 5601 | ((passw[i] * bpp + 7) / 8) * 8, passw[i] * bpp, passh[i]); |
embeddedartists | 0:a771927a62fd | 5602 | error = filter(&(*out)[filter_passstart[i]], padded, |
embeddedartists | 0:a771927a62fd | 5603 | passw[i], passh[i], &info_png->color, settings); |
embeddedartists | 0:a771927a62fd | 5604 | lodepng_free(padded); |
embeddedartists | 0:a771927a62fd | 5605 | } |
embeddedartists | 0:a771927a62fd | 5606 | else |
embeddedartists | 0:a771927a62fd | 5607 | { |
embeddedartists | 0:a771927a62fd | 5608 | error = filter(&(*out)[filter_passstart[i]], &adam7[padded_passstart[i]], |
embeddedartists | 0:a771927a62fd | 5609 | passw[i], passh[i], &info_png->color, settings); |
embeddedartists | 0:a771927a62fd | 5610 | } |
embeddedartists | 0:a771927a62fd | 5611 | |
embeddedartists | 0:a771927a62fd | 5612 | if(error) break; |
embeddedartists | 0:a771927a62fd | 5613 | } |
embeddedartists | 0:a771927a62fd | 5614 | } |
embeddedartists | 0:a771927a62fd | 5615 | |
embeddedartists | 0:a771927a62fd | 5616 | lodepng_free(adam7); |
embeddedartists | 0:a771927a62fd | 5617 | } |
embeddedartists | 0:a771927a62fd | 5618 | |
embeddedartists | 0:a771927a62fd | 5619 | return error; |
embeddedartists | 0:a771927a62fd | 5620 | } |
embeddedartists | 0:a771927a62fd | 5621 | |
embeddedartists | 0:a771927a62fd | 5622 | /* |
embeddedartists | 0:a771927a62fd | 5623 | palette must have 4 * palettesize bytes allocated, and given in format RGBARGBARGBARGBA... |
embeddedartists | 0:a771927a62fd | 5624 | returns 0 if the palette is opaque, |
embeddedartists | 0:a771927a62fd | 5625 | returns 1 if the palette has a single color with alpha 0 ==> color key |
embeddedartists | 0:a771927a62fd | 5626 | returns 2 if the palette is semi-translucent. |
embeddedartists | 0:a771927a62fd | 5627 | */ |
embeddedartists | 0:a771927a62fd | 5628 | static unsigned getPaletteTranslucency(const unsigned char* palette, size_t palettesize) |
embeddedartists | 0:a771927a62fd | 5629 | { |
embeddedartists | 0:a771927a62fd | 5630 | size_t i, key = 0; |
embeddedartists | 0:a771927a62fd | 5631 | unsigned r = 0, g = 0, b = 0; /*the value of the color with alpha 0, so long as color keying is possible*/ |
embeddedartists | 0:a771927a62fd | 5632 | for(i = 0; i < palettesize; i++) |
embeddedartists | 0:a771927a62fd | 5633 | { |
embeddedartists | 0:a771927a62fd | 5634 | if(!key && palette[4 * i + 3] == 0) |
embeddedartists | 0:a771927a62fd | 5635 | { |
embeddedartists | 0:a771927a62fd | 5636 | r = palette[4 * i + 0]; g = palette[4 * i + 1]; b = palette[4 * i + 2]; |
embeddedartists | 0:a771927a62fd | 5637 | key = 1; |
embeddedartists | 0:a771927a62fd | 5638 | i = (size_t)(-1); /*restart from beginning, to detect earlier opaque colors with key's value*/ |
embeddedartists | 0:a771927a62fd | 5639 | } |
embeddedartists | 0:a771927a62fd | 5640 | else if(palette[4 * i + 3] != 255) return 2; |
embeddedartists | 0:a771927a62fd | 5641 | /*when key, no opaque RGB may have key's RGB*/ |
embeddedartists | 0:a771927a62fd | 5642 | else if(key && r == palette[i * 4 + 0] && g == palette[i * 4 + 1] && b == palette[i * 4 + 2]) return 2; |
embeddedartists | 0:a771927a62fd | 5643 | } |
embeddedartists | 0:a771927a62fd | 5644 | return key; |
embeddedartists | 0:a771927a62fd | 5645 | } |
embeddedartists | 0:a771927a62fd | 5646 | |
embeddedartists | 0:a771927a62fd | 5647 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 5648 | static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize) |
embeddedartists | 0:a771927a62fd | 5649 | { |
embeddedartists | 0:a771927a62fd | 5650 | unsigned char* inchunk = data; |
embeddedartists | 0:a771927a62fd | 5651 | while((size_t)(inchunk - data) < datasize) |
embeddedartists | 0:a771927a62fd | 5652 | { |
embeddedartists | 0:a771927a62fd | 5653 | CERROR_TRY_RETURN(lodepng_chunk_append(&out->data, &out->size, inchunk)); |
embeddedartists | 0:a771927a62fd | 5654 | out->allocsize = out->size; /*fix the allocsize again*/ |
embeddedartists | 0:a771927a62fd | 5655 | inchunk = lodepng_chunk_next(inchunk); |
embeddedartists | 0:a771927a62fd | 5656 | } |
embeddedartists | 0:a771927a62fd | 5657 | return 0; |
embeddedartists | 0:a771927a62fd | 5658 | } |
embeddedartists | 0:a771927a62fd | 5659 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 5660 | |
embeddedartists | 0:a771927a62fd | 5661 | unsigned lodepng_encode(unsigned char** out, size_t* outsize, |
embeddedartists | 0:a771927a62fd | 5662 | const unsigned char* image, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 5663 | LodePNGState* state) |
embeddedartists | 0:a771927a62fd | 5664 | { |
embeddedartists | 0:a771927a62fd | 5665 | LodePNGInfo info; |
embeddedartists | 0:a771927a62fd | 5666 | ucvector outv; |
embeddedartists | 0:a771927a62fd | 5667 | unsigned char* data = 0; /*uncompressed version of the IDAT chunk data*/ |
embeddedartists | 0:a771927a62fd | 5668 | size_t datasize = 0; |
embeddedartists | 0:a771927a62fd | 5669 | |
embeddedartists | 0:a771927a62fd | 5670 | /*provide some proper output values if error will happen*/ |
embeddedartists | 0:a771927a62fd | 5671 | *out = 0; |
embeddedartists | 0:a771927a62fd | 5672 | *outsize = 0; |
embeddedartists | 0:a771927a62fd | 5673 | state->error = 0; |
embeddedartists | 0:a771927a62fd | 5674 | |
embeddedartists | 0:a771927a62fd | 5675 | lodepng_info_init(&info); |
embeddedartists | 0:a771927a62fd | 5676 | lodepng_info_copy(&info, &state->info_png); |
embeddedartists | 0:a771927a62fd | 5677 | |
embeddedartists | 0:a771927a62fd | 5678 | if((info.color.colortype == LCT_PALETTE || state->encoder.force_palette) |
embeddedartists | 0:a771927a62fd | 5679 | && (info.color.palettesize == 0 || info.color.palettesize > 256)) |
embeddedartists | 0:a771927a62fd | 5680 | { |
embeddedartists | 0:a771927a62fd | 5681 | state->error = 68; /*invalid palette size, it is only allowed to be 1-256*/ |
embeddedartists | 0:a771927a62fd | 5682 | return state->error; |
embeddedartists | 0:a771927a62fd | 5683 | } |
embeddedartists | 0:a771927a62fd | 5684 | |
embeddedartists | 0:a771927a62fd | 5685 | if(state->encoder.auto_convert != LAC_NO) |
embeddedartists | 0:a771927a62fd | 5686 | { |
embeddedartists | 0:a771927a62fd | 5687 | state->error = lodepng_auto_choose_color(&info.color, image, w, h, &state->info_raw, |
embeddedartists | 0:a771927a62fd | 5688 | state->encoder.auto_convert); |
embeddedartists | 0:a771927a62fd | 5689 | } |
embeddedartists | 0:a771927a62fd | 5690 | if(state->error) return state->error; |
embeddedartists | 0:a771927a62fd | 5691 | |
embeddedartists | 0:a771927a62fd | 5692 | if(state->encoder.zlibsettings.btype > 2) |
embeddedartists | 0:a771927a62fd | 5693 | { |
embeddedartists | 0:a771927a62fd | 5694 | CERROR_RETURN_ERROR(state->error, 61); /*error: unexisting btype*/ |
embeddedartists | 0:a771927a62fd | 5695 | } |
embeddedartists | 0:a771927a62fd | 5696 | if(state->info_png.interlace_method > 1) |
embeddedartists | 0:a771927a62fd | 5697 | { |
embeddedartists | 0:a771927a62fd | 5698 | CERROR_RETURN_ERROR(state->error, 71); /*error: unexisting interlace mode*/ |
embeddedartists | 0:a771927a62fd | 5699 | } |
embeddedartists | 0:a771927a62fd | 5700 | |
embeddedartists | 0:a771927a62fd | 5701 | state->error = checkColorValidity(info.color.colortype, info.color.bitdepth); |
embeddedartists | 0:a771927a62fd | 5702 | if(state->error) return state->error; /*error: unexisting color type given*/ |
embeddedartists | 0:a771927a62fd | 5703 | state->error = checkColorValidity(state->info_raw.colortype, state->info_raw.bitdepth); |
embeddedartists | 0:a771927a62fd | 5704 | if(state->error) return state->error; /*error: unexisting color type given*/ |
embeddedartists | 0:a771927a62fd | 5705 | |
embeddedartists | 0:a771927a62fd | 5706 | if(!lodepng_color_mode_equal(&state->info_raw, &info.color)) |
embeddedartists | 0:a771927a62fd | 5707 | { |
embeddedartists | 0:a771927a62fd | 5708 | unsigned char* converted; |
embeddedartists | 0:a771927a62fd | 5709 | size_t size = (w * h * lodepng_get_bpp(&info.color) + 7) / 8; |
embeddedartists | 0:a771927a62fd | 5710 | |
embeddedartists | 0:a771927a62fd | 5711 | converted = (unsigned char*)lodepng_malloc(size); |
embeddedartists | 0:a771927a62fd | 5712 | if(!converted && size) state->error = 83; /*alloc fail*/ |
embeddedartists | 0:a771927a62fd | 5713 | if(!state->error) |
embeddedartists | 0:a771927a62fd | 5714 | { |
embeddedartists | 0:a771927a62fd | 5715 | state->error = lodepng_convert(converted, image, &info.color, &state->info_raw, w, h, 0 /*fix_png*/); |
embeddedartists | 0:a771927a62fd | 5716 | } |
embeddedartists | 0:a771927a62fd | 5717 | if(!state->error) preProcessScanlines(&data, &datasize, converted, w, h, &info, &state->encoder); |
embeddedartists | 0:a771927a62fd | 5718 | lodepng_free(converted); |
embeddedartists | 0:a771927a62fd | 5719 | } |
embeddedartists | 0:a771927a62fd | 5720 | else preProcessScanlines(&data, &datasize, image, w, h, &info, &state->encoder); |
embeddedartists | 0:a771927a62fd | 5721 | |
embeddedartists | 0:a771927a62fd | 5722 | ucvector_init(&outv); |
embeddedartists | 0:a771927a62fd | 5723 | while(!state->error) /*while only executed once, to break on error*/ |
embeddedartists | 0:a771927a62fd | 5724 | { |
embeddedartists | 0:a771927a62fd | 5725 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 5726 | size_t i; |
embeddedartists | 0:a771927a62fd | 5727 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 5728 | /*write signature and chunks*/ |
embeddedartists | 0:a771927a62fd | 5729 | writeSignature(&outv); |
embeddedartists | 0:a771927a62fd | 5730 | /*IHDR*/ |
embeddedartists | 0:a771927a62fd | 5731 | addChunk_IHDR(&outv, w, h, info.color.colortype, info.color.bitdepth, info.interlace_method); |
embeddedartists | 0:a771927a62fd | 5732 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 5733 | /*unknown chunks between IHDR and PLTE*/ |
embeddedartists | 0:a771927a62fd | 5734 | if(info.unknown_chunks_data[0]) |
embeddedartists | 0:a771927a62fd | 5735 | { |
embeddedartists | 0:a771927a62fd | 5736 | state->error = addUnknownChunks(&outv, info.unknown_chunks_data[0], info.unknown_chunks_size[0]); |
embeddedartists | 0:a771927a62fd | 5737 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 5738 | } |
embeddedartists | 0:a771927a62fd | 5739 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 5740 | /*PLTE*/ |
embeddedartists | 0:a771927a62fd | 5741 | if(info.color.colortype == LCT_PALETTE) |
embeddedartists | 0:a771927a62fd | 5742 | { |
embeddedartists | 0:a771927a62fd | 5743 | addChunk_PLTE(&outv, &info.color); |
embeddedartists | 0:a771927a62fd | 5744 | } |
embeddedartists | 0:a771927a62fd | 5745 | if(state->encoder.force_palette && (info.color.colortype == LCT_RGB || info.color.colortype == LCT_RGBA)) |
embeddedartists | 0:a771927a62fd | 5746 | { |
embeddedartists | 0:a771927a62fd | 5747 | addChunk_PLTE(&outv, &info.color); |
embeddedartists | 0:a771927a62fd | 5748 | } |
embeddedartists | 0:a771927a62fd | 5749 | /*tRNS*/ |
embeddedartists | 0:a771927a62fd | 5750 | if(info.color.colortype == LCT_PALETTE && getPaletteTranslucency(info.color.palette, info.color.palettesize) != 0) |
embeddedartists | 0:a771927a62fd | 5751 | { |
embeddedartists | 0:a771927a62fd | 5752 | addChunk_tRNS(&outv, &info.color); |
embeddedartists | 0:a771927a62fd | 5753 | } |
embeddedartists | 0:a771927a62fd | 5754 | if((info.color.colortype == LCT_GREY || info.color.colortype == LCT_RGB) && info.color.key_defined) |
embeddedartists | 0:a771927a62fd | 5755 | { |
embeddedartists | 0:a771927a62fd | 5756 | addChunk_tRNS(&outv, &info.color); |
embeddedartists | 0:a771927a62fd | 5757 | } |
embeddedartists | 0:a771927a62fd | 5758 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 5759 | /*bKGD (must come between PLTE and the IDAt chunks*/ |
embeddedartists | 0:a771927a62fd | 5760 | if(info.background_defined) addChunk_bKGD(&outv, &info); |
embeddedartists | 0:a771927a62fd | 5761 | /*pHYs (must come before the IDAT chunks)*/ |
embeddedartists | 0:a771927a62fd | 5762 | if(info.phys_defined) addChunk_pHYs(&outv, &info); |
embeddedartists | 0:a771927a62fd | 5763 | |
embeddedartists | 0:a771927a62fd | 5764 | /*unknown chunks between PLTE and IDAT*/ |
embeddedartists | 0:a771927a62fd | 5765 | if(info.unknown_chunks_data[1]) |
embeddedartists | 0:a771927a62fd | 5766 | { |
embeddedartists | 0:a771927a62fd | 5767 | state->error = addUnknownChunks(&outv, info.unknown_chunks_data[1], info.unknown_chunks_size[1]); |
embeddedartists | 0:a771927a62fd | 5768 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 5769 | } |
embeddedartists | 0:a771927a62fd | 5770 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 5771 | /*IDAT (multiple IDAT chunks must be consecutive)*/ |
embeddedartists | 0:a771927a62fd | 5772 | state->error = addChunk_IDAT(&outv, data, datasize, &state->encoder.zlibsettings); |
embeddedartists | 0:a771927a62fd | 5773 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 5774 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 5775 | /*tIME*/ |
embeddedartists | 0:a771927a62fd | 5776 | if(info.time_defined) addChunk_tIME(&outv, &info.time); |
embeddedartists | 0:a771927a62fd | 5777 | /*tEXt and/or zTXt*/ |
embeddedartists | 0:a771927a62fd | 5778 | for(i = 0; i < info.text_num; i++) |
embeddedartists | 0:a771927a62fd | 5779 | { |
embeddedartists | 0:a771927a62fd | 5780 | if(strlen(info.text_keys[i]) > 79) |
embeddedartists | 0:a771927a62fd | 5781 | { |
embeddedartists | 0:a771927a62fd | 5782 | state->error = 66; /*text chunk too large*/ |
embeddedartists | 0:a771927a62fd | 5783 | break; |
embeddedartists | 0:a771927a62fd | 5784 | } |
embeddedartists | 0:a771927a62fd | 5785 | if(strlen(info.text_keys[i]) < 1) |
embeddedartists | 0:a771927a62fd | 5786 | { |
embeddedartists | 0:a771927a62fd | 5787 | state->error = 67; /*text chunk too small*/ |
embeddedartists | 0:a771927a62fd | 5788 | break; |
embeddedartists | 0:a771927a62fd | 5789 | } |
embeddedartists | 0:a771927a62fd | 5790 | if(state->encoder.text_compression) |
embeddedartists | 0:a771927a62fd | 5791 | { |
embeddedartists | 0:a771927a62fd | 5792 | addChunk_zTXt(&outv, info.text_keys[i], info.text_strings[i], &state->encoder.zlibsettings); |
embeddedartists | 0:a771927a62fd | 5793 | } |
embeddedartists | 0:a771927a62fd | 5794 | else |
embeddedartists | 0:a771927a62fd | 5795 | { |
embeddedartists | 0:a771927a62fd | 5796 | addChunk_tEXt(&outv, info.text_keys[i], info.text_strings[i]); |
embeddedartists | 0:a771927a62fd | 5797 | } |
embeddedartists | 0:a771927a62fd | 5798 | } |
embeddedartists | 0:a771927a62fd | 5799 | /*LodePNG version id in text chunk*/ |
embeddedartists | 0:a771927a62fd | 5800 | if(state->encoder.add_id) |
embeddedartists | 0:a771927a62fd | 5801 | { |
embeddedartists | 0:a771927a62fd | 5802 | unsigned alread_added_id_text = 0; |
embeddedartists | 0:a771927a62fd | 5803 | for(i = 0; i < info.text_num; i++) |
embeddedartists | 0:a771927a62fd | 5804 | { |
embeddedartists | 0:a771927a62fd | 5805 | if(!strcmp(info.text_keys[i], "LodePNG")) |
embeddedartists | 0:a771927a62fd | 5806 | { |
embeddedartists | 0:a771927a62fd | 5807 | alread_added_id_text = 1; |
embeddedartists | 0:a771927a62fd | 5808 | break; |
embeddedartists | 0:a771927a62fd | 5809 | } |
embeddedartists | 0:a771927a62fd | 5810 | } |
embeddedartists | 0:a771927a62fd | 5811 | if(alread_added_id_text == 0) |
embeddedartists | 0:a771927a62fd | 5812 | { |
embeddedartists | 0:a771927a62fd | 5813 | addChunk_tEXt(&outv, "LodePNG", VERSION_STRING); /*it's shorter as tEXt than as zTXt chunk*/ |
embeddedartists | 0:a771927a62fd | 5814 | } |
embeddedartists | 0:a771927a62fd | 5815 | } |
embeddedartists | 0:a771927a62fd | 5816 | /*iTXt*/ |
embeddedartists | 0:a771927a62fd | 5817 | for(i = 0; i < info.itext_num; i++) |
embeddedartists | 0:a771927a62fd | 5818 | { |
embeddedartists | 0:a771927a62fd | 5819 | if(strlen(info.itext_keys[i]) > 79) |
embeddedartists | 0:a771927a62fd | 5820 | { |
embeddedartists | 0:a771927a62fd | 5821 | state->error = 66; /*text chunk too large*/ |
embeddedartists | 0:a771927a62fd | 5822 | break; |
embeddedartists | 0:a771927a62fd | 5823 | } |
embeddedartists | 0:a771927a62fd | 5824 | if(strlen(info.itext_keys[i]) < 1) |
embeddedartists | 0:a771927a62fd | 5825 | { |
embeddedartists | 0:a771927a62fd | 5826 | state->error = 67; /*text chunk too small*/ |
embeddedartists | 0:a771927a62fd | 5827 | break; |
embeddedartists | 0:a771927a62fd | 5828 | } |
embeddedartists | 0:a771927a62fd | 5829 | addChunk_iTXt(&outv, state->encoder.text_compression, |
embeddedartists | 0:a771927a62fd | 5830 | info.itext_keys[i], info.itext_langtags[i], info.itext_transkeys[i], info.itext_strings[i], |
embeddedartists | 0:a771927a62fd | 5831 | &state->encoder.zlibsettings); |
embeddedartists | 0:a771927a62fd | 5832 | } |
embeddedartists | 0:a771927a62fd | 5833 | |
embeddedartists | 0:a771927a62fd | 5834 | /*unknown chunks between IDAT and IEND*/ |
embeddedartists | 0:a771927a62fd | 5835 | if(info.unknown_chunks_data[2]) |
embeddedartists | 0:a771927a62fd | 5836 | { |
embeddedartists | 0:a771927a62fd | 5837 | state->error = addUnknownChunks(&outv, info.unknown_chunks_data[2], info.unknown_chunks_size[2]); |
embeddedartists | 0:a771927a62fd | 5838 | if(state->error) break; |
embeddedartists | 0:a771927a62fd | 5839 | } |
embeddedartists | 0:a771927a62fd | 5840 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 5841 | addChunk_IEND(&outv); |
embeddedartists | 0:a771927a62fd | 5842 | |
embeddedartists | 0:a771927a62fd | 5843 | break; /*this isn't really a while loop; no error happened so break out now!*/ |
embeddedartists | 0:a771927a62fd | 5844 | } |
embeddedartists | 0:a771927a62fd | 5845 | |
embeddedartists | 0:a771927a62fd | 5846 | lodepng_info_cleanup(&info); |
embeddedartists | 0:a771927a62fd | 5847 | lodepng_free(data); |
embeddedartists | 0:a771927a62fd | 5848 | /*instead of cleaning the vector up, give it to the output*/ |
embeddedartists | 0:a771927a62fd | 5849 | *out = outv.data; |
embeddedartists | 0:a771927a62fd | 5850 | *outsize = outv.size; |
embeddedartists | 0:a771927a62fd | 5851 | |
embeddedartists | 0:a771927a62fd | 5852 | return state->error; |
embeddedartists | 0:a771927a62fd | 5853 | } |
embeddedartists | 0:a771927a62fd | 5854 | |
embeddedartists | 0:a771927a62fd | 5855 | unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, const unsigned char* image, |
embeddedartists | 0:a771927a62fd | 5856 | unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 5857 | { |
embeddedartists | 0:a771927a62fd | 5858 | unsigned error; |
embeddedartists | 0:a771927a62fd | 5859 | LodePNGState state; |
embeddedartists | 0:a771927a62fd | 5860 | lodepng_state_init(&state); |
embeddedartists | 0:a771927a62fd | 5861 | state.info_raw.colortype = colortype; |
embeddedartists | 0:a771927a62fd | 5862 | state.info_raw.bitdepth = bitdepth; |
embeddedartists | 0:a771927a62fd | 5863 | state.info_png.color.colortype = colortype; |
embeddedartists | 0:a771927a62fd | 5864 | state.info_png.color.bitdepth = bitdepth; |
embeddedartists | 0:a771927a62fd | 5865 | lodepng_encode(out, outsize, image, w, h, &state); |
embeddedartists | 0:a771927a62fd | 5866 | error = state.error; |
embeddedartists | 0:a771927a62fd | 5867 | lodepng_state_cleanup(&state); |
embeddedartists | 0:a771927a62fd | 5868 | return error; |
embeddedartists | 0:a771927a62fd | 5869 | } |
embeddedartists | 0:a771927a62fd | 5870 | |
embeddedartists | 0:a771927a62fd | 5871 | unsigned lodepng_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) |
embeddedartists | 0:a771927a62fd | 5872 | { |
embeddedartists | 0:a771927a62fd | 5873 | return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGBA, 8); |
embeddedartists | 0:a771927a62fd | 5874 | } |
embeddedartists | 0:a771927a62fd | 5875 | |
embeddedartists | 0:a771927a62fd | 5876 | unsigned lodepng_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) |
embeddedartists | 0:a771927a62fd | 5877 | { |
embeddedartists | 0:a771927a62fd | 5878 | return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGB, 8); |
embeddedartists | 0:a771927a62fd | 5879 | } |
embeddedartists | 0:a771927a62fd | 5880 | |
embeddedartists | 0:a771927a62fd | 5881 | #ifdef LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 5882 | unsigned lodepng_encode_file(const char* filename, const unsigned char* image, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 5883 | LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 5884 | { |
embeddedartists | 0:a771927a62fd | 5885 | unsigned char* buffer; |
embeddedartists | 0:a771927a62fd | 5886 | size_t buffersize; |
embeddedartists | 0:a771927a62fd | 5887 | unsigned error = lodepng_encode_memory(&buffer, &buffersize, image, w, h, colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 5888 | if(!error) error = lodepng_save_file(buffer, buffersize, filename); |
embeddedartists | 0:a771927a62fd | 5889 | lodepng_free(buffer); |
embeddedartists | 0:a771927a62fd | 5890 | return error; |
embeddedartists | 0:a771927a62fd | 5891 | } |
embeddedartists | 0:a771927a62fd | 5892 | |
embeddedartists | 0:a771927a62fd | 5893 | unsigned lodepng_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) |
embeddedartists | 0:a771927a62fd | 5894 | { |
embeddedartists | 0:a771927a62fd | 5895 | return lodepng_encode_file(filename, image, w, h, LCT_RGBA, 8); |
embeddedartists | 0:a771927a62fd | 5896 | } |
embeddedartists | 0:a771927a62fd | 5897 | |
embeddedartists | 0:a771927a62fd | 5898 | unsigned lodepng_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) |
embeddedartists | 0:a771927a62fd | 5899 | { |
embeddedartists | 0:a771927a62fd | 5900 | return lodepng_encode_file(filename, image, w, h, LCT_RGB, 8); |
embeddedartists | 0:a771927a62fd | 5901 | } |
embeddedartists | 0:a771927a62fd | 5902 | #endif /*LODEPNG_COMPILE_DISK*/ |
embeddedartists | 0:a771927a62fd | 5903 | |
embeddedartists | 0:a771927a62fd | 5904 | void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings) |
embeddedartists | 0:a771927a62fd | 5905 | { |
embeddedartists | 0:a771927a62fd | 5906 | lodepng_compress_settings_init(&settings->zlibsettings); |
embeddedartists | 0:a771927a62fd | 5907 | settings->filter_palette_zero = 1; |
embeddedartists | 0:a771927a62fd | 5908 | settings->filter_strategy = LFS_MINSUM; |
embeddedartists | 0:a771927a62fd | 5909 | settings->auto_convert = LAC_AUTO; |
embeddedartists | 0:a771927a62fd | 5910 | settings->force_palette = 0; |
embeddedartists | 0:a771927a62fd | 5911 | settings->predefined_filters = 0; |
embeddedartists | 0:a771927a62fd | 5912 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS |
embeddedartists | 0:a771927a62fd | 5913 | settings->add_id = 0; |
embeddedartists | 0:a771927a62fd | 5914 | settings->text_compression = 1; |
embeddedartists | 0:a771927a62fd | 5915 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ |
embeddedartists | 0:a771927a62fd | 5916 | } |
embeddedartists | 0:a771927a62fd | 5917 | |
embeddedartists | 0:a771927a62fd | 5918 | #endif /*LODEPNG_COMPILE_ENCODER*/ |
embeddedartists | 0:a771927a62fd | 5919 | #endif /*LODEPNG_COMPILE_PNG*/ |
embeddedartists | 0:a771927a62fd | 5920 | |
embeddedartists | 0:a771927a62fd | 5921 | #ifdef LODEPNG_COMPILE_ERROR_TEXT |
embeddedartists | 0:a771927a62fd | 5922 | /* |
embeddedartists | 0:a771927a62fd | 5923 | This returns the description of a numerical error code in English. This is also |
embeddedartists | 0:a771927a62fd | 5924 | the documentation of all the error codes. |
embeddedartists | 0:a771927a62fd | 5925 | */ |
embeddedartists | 0:a771927a62fd | 5926 | const char* lodepng_error_text(unsigned code) |
embeddedartists | 0:a771927a62fd | 5927 | { |
embeddedartists | 0:a771927a62fd | 5928 | switch(code) |
embeddedartists | 0:a771927a62fd | 5929 | { |
embeddedartists | 0:a771927a62fd | 5930 | case 0: return "no error, everything went ok"; |
embeddedartists | 0:a771927a62fd | 5931 | case 1: return "nothing done yet"; /*the Encoder/Decoder has done nothing yet, error checking makes no sense yet*/ |
embeddedartists | 0:a771927a62fd | 5932 | case 10: return "end of input memory reached without huffman end code"; /*while huffman decoding*/ |
embeddedartists | 0:a771927a62fd | 5933 | case 11: return "error in code tree made it jump outside of huffman tree"; /*while huffman decoding*/ |
embeddedartists | 0:a771927a62fd | 5934 | case 13: return "problem while processing dynamic deflate block"; |
embeddedartists | 0:a771927a62fd | 5935 | case 14: return "problem while processing dynamic deflate block"; |
embeddedartists | 0:a771927a62fd | 5936 | case 15: return "problem while processing dynamic deflate block"; |
embeddedartists | 0:a771927a62fd | 5937 | case 16: return "unexisting code while processing dynamic deflate block"; |
embeddedartists | 0:a771927a62fd | 5938 | case 17: return "end of out buffer memory reached while inflating"; |
embeddedartists | 0:a771927a62fd | 5939 | case 18: return "invalid distance code while inflating"; |
embeddedartists | 0:a771927a62fd | 5940 | case 19: return "end of out buffer memory reached while inflating"; |
embeddedartists | 0:a771927a62fd | 5941 | case 20: return "invalid deflate block BTYPE encountered while decoding"; |
embeddedartists | 0:a771927a62fd | 5942 | case 21: return "NLEN is not ones complement of LEN in a deflate block"; |
embeddedartists | 0:a771927a62fd | 5943 | /*end of out buffer memory reached while inflating: |
embeddedartists | 0:a771927a62fd | 5944 | This can happen if the inflated deflate data is longer than the amount of bytes required to fill up |
embeddedartists | 0:a771927a62fd | 5945 | all the pixels of the image, given the color depth and image dimensions. Something that doesn't |
embeddedartists | 0:a771927a62fd | 5946 | happen in a normal, well encoded, PNG image.*/ |
embeddedartists | 0:a771927a62fd | 5947 | case 22: return "end of out buffer memory reached while inflating"; |
embeddedartists | 0:a771927a62fd | 5948 | case 23: return "end of in buffer memory reached while inflating"; |
embeddedartists | 0:a771927a62fd | 5949 | case 24: return "invalid FCHECK in zlib header"; |
embeddedartists | 0:a771927a62fd | 5950 | case 25: return "invalid compression method in zlib header"; |
embeddedartists | 0:a771927a62fd | 5951 | case 26: return "FDICT encountered in zlib header while it's not used for PNG"; |
embeddedartists | 0:a771927a62fd | 5952 | case 27: return "PNG file is smaller than a PNG header"; |
embeddedartists | 0:a771927a62fd | 5953 | /*Checks the magic file header, the first 8 bytes of the PNG file*/ |
embeddedartists | 0:a771927a62fd | 5954 | case 28: return "incorrect PNG signature, it's no PNG or corrupted"; |
embeddedartists | 0:a771927a62fd | 5955 | case 29: return "first chunk is not the header chunk"; |
embeddedartists | 0:a771927a62fd | 5956 | case 30: return "chunk length too large, chunk broken off at end of file"; |
embeddedartists | 0:a771927a62fd | 5957 | case 31: return "illegal PNG color type or bpp"; |
embeddedartists | 0:a771927a62fd | 5958 | case 32: return "illegal PNG compression method"; |
embeddedartists | 0:a771927a62fd | 5959 | case 33: return "illegal PNG filter method"; |
embeddedartists | 0:a771927a62fd | 5960 | case 34: return "illegal PNG interlace method"; |
embeddedartists | 0:a771927a62fd | 5961 | case 35: return "chunk length of a chunk is too large or the chunk too small"; |
embeddedartists | 0:a771927a62fd | 5962 | case 36: return "illegal PNG filter type encountered"; |
embeddedartists | 0:a771927a62fd | 5963 | case 37: return "illegal bit depth for this color type given"; |
embeddedartists | 0:a771927a62fd | 5964 | case 38: return "the palette is too big"; /*more than 256 colors*/ |
embeddedartists | 0:a771927a62fd | 5965 | case 39: return "more palette alpha values given in tRNS chunk than there are colors in the palette"; |
embeddedartists | 0:a771927a62fd | 5966 | case 40: return "tRNS chunk has wrong size for greyscale image"; |
embeddedartists | 0:a771927a62fd | 5967 | case 41: return "tRNS chunk has wrong size for RGB image"; |
embeddedartists | 0:a771927a62fd | 5968 | case 42: return "tRNS chunk appeared while it was not allowed for this color type"; |
embeddedartists | 0:a771927a62fd | 5969 | case 43: return "bKGD chunk has wrong size for palette image"; |
embeddedartists | 0:a771927a62fd | 5970 | case 44: return "bKGD chunk has wrong size for greyscale image"; |
embeddedartists | 0:a771927a62fd | 5971 | case 45: return "bKGD chunk has wrong size for RGB image"; |
embeddedartists | 0:a771927a62fd | 5972 | /*Is the palette too small?*/ |
embeddedartists | 0:a771927a62fd | 5973 | case 46: return "a value in indexed image is larger than the palette size (bitdepth = 8)"; |
embeddedartists | 0:a771927a62fd | 5974 | /*Is the palette too small?*/ |
embeddedartists | 0:a771927a62fd | 5975 | case 47: return "a value in indexed image is larger than the palette size (bitdepth < 8)"; |
embeddedartists | 0:a771927a62fd | 5976 | /*the input data is empty, maybe a PNG file doesn't exist or is in the wrong path*/ |
embeddedartists | 0:a771927a62fd | 5977 | case 48: return "empty input or file doesn't exist"; |
embeddedartists | 0:a771927a62fd | 5978 | case 49: return "jumped past memory while generating dynamic huffman tree"; |
embeddedartists | 0:a771927a62fd | 5979 | case 50: return "jumped past memory while generating dynamic huffman tree"; |
embeddedartists | 0:a771927a62fd | 5980 | case 51: return "jumped past memory while inflating huffman block"; |
embeddedartists | 0:a771927a62fd | 5981 | case 52: return "jumped past memory while inflating"; |
embeddedartists | 0:a771927a62fd | 5982 | case 53: return "size of zlib data too small"; |
embeddedartists | 0:a771927a62fd | 5983 | case 54: return "repeat symbol in tree while there was no value symbol yet"; |
embeddedartists | 0:a771927a62fd | 5984 | /*jumped past tree while generating huffman tree, this could be when the |
embeddedartists | 0:a771927a62fd | 5985 | tree will have more leaves than symbols after generating it out of the |
embeddedartists | 0:a771927a62fd | 5986 | given lenghts. They call this an oversubscribed dynamic bit lengths tree in zlib.*/ |
embeddedartists | 0:a771927a62fd | 5987 | case 55: return "jumped past tree while generating huffman tree"; |
embeddedartists | 0:a771927a62fd | 5988 | case 56: return "given output image colortype or bitdepth not supported for color conversion"; |
embeddedartists | 0:a771927a62fd | 5989 | case 57: return "invalid CRC encountered (checking CRC can be disabled)"; |
embeddedartists | 0:a771927a62fd | 5990 | case 58: return "invalid ADLER32 encountered (checking ADLER32 can be disabled)"; |
embeddedartists | 0:a771927a62fd | 5991 | case 59: return "requested color conversion not supported"; |
embeddedartists | 0:a771927a62fd | 5992 | case 60: return "invalid window size given in the settings of the encoder (must be 0-32768)"; |
embeddedartists | 0:a771927a62fd | 5993 | case 61: return "invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed)"; |
embeddedartists | 0:a771927a62fd | 5994 | /*LodePNG leaves the choice of RGB to greyscale conversion formula to the user.*/ |
embeddedartists | 0:a771927a62fd | 5995 | case 62: return "conversion from color to greyscale not supported"; |
embeddedartists | 0:a771927a62fd | 5996 | case 63: return "length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk"; /*(2^31-1)*/ |
embeddedartists | 0:a771927a62fd | 5997 | /*this would result in the inability of a deflated block to ever contain an end code. It must be at least 1.*/ |
embeddedartists | 0:a771927a62fd | 5998 | case 64: return "the length of the END symbol 256 in the Huffman tree is 0"; |
embeddedartists | 0:a771927a62fd | 5999 | case 66: return "the length of a text chunk keyword given to the encoder is longer than the maximum of 79 bytes"; |
embeddedartists | 0:a771927a62fd | 6000 | case 67: return "the length of a text chunk keyword given to the encoder is smaller than the minimum of 1 byte"; |
embeddedartists | 0:a771927a62fd | 6001 | case 68: return "tried to encode a PLTE chunk with a palette that has less than 1 or more than 256 colors"; |
embeddedartists | 0:a771927a62fd | 6002 | case 69: return "unknown chunk type with 'critical' flag encountered by the decoder"; |
embeddedartists | 0:a771927a62fd | 6003 | case 71: return "unexisting interlace mode given to encoder (must be 0 or 1)"; |
embeddedartists | 0:a771927a62fd | 6004 | case 72: return "while decoding, unexisting compression method encountering in zTXt or iTXt chunk (it must be 0)"; |
embeddedartists | 0:a771927a62fd | 6005 | case 73: return "invalid tIME chunk size"; |
embeddedartists | 0:a771927a62fd | 6006 | case 74: return "invalid pHYs chunk size"; |
embeddedartists | 0:a771927a62fd | 6007 | /*length could be wrong, or data chopped off*/ |
embeddedartists | 0:a771927a62fd | 6008 | case 75: return "no null termination char found while decoding text chunk"; |
embeddedartists | 0:a771927a62fd | 6009 | case 76: return "iTXt chunk too short to contain required bytes"; |
embeddedartists | 0:a771927a62fd | 6010 | case 77: return "integer overflow in buffer size"; |
embeddedartists | 0:a771927a62fd | 6011 | case 78: return "failed to open file for reading"; /*file doesn't exist or couldn't be opened for reading*/ |
embeddedartists | 0:a771927a62fd | 6012 | case 79: return "failed to open file for writing"; |
embeddedartists | 0:a771927a62fd | 6013 | case 80: return "tried creating a tree of 0 symbols"; |
embeddedartists | 0:a771927a62fd | 6014 | case 81: return "lazy matching at pos 0 is impossible"; |
embeddedartists | 0:a771927a62fd | 6015 | case 82: return "color conversion to palette requested while a color isn't in palette"; |
embeddedartists | 0:a771927a62fd | 6016 | case 83: return "memory allocation failed"; |
embeddedartists | 0:a771927a62fd | 6017 | case 84: return "given image too small to contain all pixels to be encoded"; |
embeddedartists | 0:a771927a62fd | 6018 | case 85: return "internal color conversion bug"; |
embeddedartists | 0:a771927a62fd | 6019 | case 86: return "impossible offset in lz77 encoding (internal bug)"; |
embeddedartists | 0:a771927a62fd | 6020 | case 87: return "must provide custom zlib function pointer if LODEPNG_COMPILE_ZLIB is not defined"; |
embeddedartists | 0:a771927a62fd | 6021 | case 88: return "invalid filter strategy given for LodePNGEncoderSettings.filter_strategy"; |
embeddedartists | 0:a771927a62fd | 6022 | case 89: return "text chunk keyword too short or long: must have size 1-79"; |
embeddedartists | 0:a771927a62fd | 6023 | /*the windowsize in the LodePNGCompressSettings. Requiring POT(==> & instead of %) makes encoding 12% faster.*/ |
embeddedartists | 0:a771927a62fd | 6024 | case 90: return "windowsize must be a power of two"; |
embeddedartists | 0:a771927a62fd | 6025 | } |
embeddedartists | 0:a771927a62fd | 6026 | return "unknown error code"; |
embeddedartists | 0:a771927a62fd | 6027 | } |
embeddedartists | 0:a771927a62fd | 6028 | #endif /*LODEPNG_COMPILE_ERROR_TEXT*/ |
embeddedartists | 0:a771927a62fd | 6029 | |
embeddedartists | 0:a771927a62fd | 6030 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 6031 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 6032 | /* // C++ Wrapper // */ |
embeddedartists | 0:a771927a62fd | 6033 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 6034 | /* ////////////////////////////////////////////////////////////////////////// */ |
embeddedartists | 0:a771927a62fd | 6035 | |
embeddedartists | 0:a771927a62fd | 6036 | #ifdef LODEPNG_COMPILE_CPP |
embeddedartists | 0:a771927a62fd | 6037 | namespace lodepng |
embeddedartists | 0:a771927a62fd | 6038 | { |
embeddedartists | 0:a771927a62fd | 6039 | |
embeddedartists | 0:a771927a62fd | 6040 | #ifdef LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 6041 | void load_file(std::vector<unsigned char>& buffer, const std::string& filename) |
embeddedartists | 0:a771927a62fd | 6042 | { |
embeddedartists | 0:a771927a62fd | 6043 | std::ifstream file(filename.c_str(), std::ios::in|std::ios::binary|std::ios::ate); |
embeddedartists | 0:a771927a62fd | 6044 | |
embeddedartists | 0:a771927a62fd | 6045 | /*get filesize*/ |
embeddedartists | 0:a771927a62fd | 6046 | std::streamsize size = 0; |
embeddedartists | 0:a771927a62fd | 6047 | if(file.seekg(0, std::ios::end).good()) size = file.tellg(); |
embeddedartists | 0:a771927a62fd | 6048 | if(file.seekg(0, std::ios::beg).good()) size -= file.tellg(); |
embeddedartists | 0:a771927a62fd | 6049 | |
embeddedartists | 0:a771927a62fd | 6050 | /*read contents of the file into the vector*/ |
embeddedartists | 0:a771927a62fd | 6051 | buffer.resize(size_t(size)); |
embeddedartists | 0:a771927a62fd | 6052 | if(size > 0) file.read((char*)(&buffer[0]), size); |
embeddedartists | 0:a771927a62fd | 6053 | } |
embeddedartists | 0:a771927a62fd | 6054 | |
embeddedartists | 0:a771927a62fd | 6055 | /*write given buffer to the file, overwriting the file, it doesn't append to it.*/ |
embeddedartists | 0:a771927a62fd | 6056 | void save_file(const std::vector<unsigned char>& buffer, const std::string& filename) |
embeddedartists | 0:a771927a62fd | 6057 | { |
embeddedartists | 0:a771927a62fd | 6058 | std::ofstream file(filename.c_str(), std::ios::out|std::ios::binary); |
embeddedartists | 0:a771927a62fd | 6059 | file.write(buffer.empty() ? 0 : (char*)&buffer[0], std::streamsize(buffer.size())); |
embeddedartists | 0:a771927a62fd | 6060 | } |
embeddedartists | 0:a771927a62fd | 6061 | #endif //LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 6062 | |
embeddedartists | 0:a771927a62fd | 6063 | #ifdef LODEPNG_COMPILE_ZLIB |
embeddedartists | 0:a771927a62fd | 6064 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 6065 | unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize, |
embeddedartists | 0:a771927a62fd | 6066 | const LodePNGDecompressSettings& settings) |
embeddedartists | 0:a771927a62fd | 6067 | { |
embeddedartists | 0:a771927a62fd | 6068 | unsigned char* buffer = 0; |
embeddedartists | 0:a771927a62fd | 6069 | size_t buffersize = 0; |
embeddedartists | 0:a771927a62fd | 6070 | unsigned error = zlib_decompress(&buffer, &buffersize, in, insize, &settings); |
embeddedartists | 0:a771927a62fd | 6071 | if(buffer) |
embeddedartists | 0:a771927a62fd | 6072 | { |
embeddedartists | 0:a771927a62fd | 6073 | out.insert(out.end(), &buffer[0], &buffer[buffersize]); |
embeddedartists | 0:a771927a62fd | 6074 | lodepng_free(buffer); |
embeddedartists | 0:a771927a62fd | 6075 | } |
embeddedartists | 0:a771927a62fd | 6076 | return error; |
embeddedartists | 0:a771927a62fd | 6077 | } |
embeddedartists | 0:a771927a62fd | 6078 | |
embeddedartists | 0:a771927a62fd | 6079 | unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, |
embeddedartists | 0:a771927a62fd | 6080 | const LodePNGDecompressSettings& settings) |
embeddedartists | 0:a771927a62fd | 6081 | { |
embeddedartists | 0:a771927a62fd | 6082 | return decompress(out, in.empty() ? 0 : &in[0], in.size(), settings); |
embeddedartists | 0:a771927a62fd | 6083 | } |
embeddedartists | 0:a771927a62fd | 6084 | #endif //LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 6085 | |
embeddedartists | 0:a771927a62fd | 6086 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 6087 | unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize, |
embeddedartists | 0:a771927a62fd | 6088 | const LodePNGCompressSettings& settings) |
embeddedartists | 0:a771927a62fd | 6089 | { |
embeddedartists | 0:a771927a62fd | 6090 | unsigned char* buffer = 0; |
embeddedartists | 0:a771927a62fd | 6091 | size_t buffersize = 0; |
embeddedartists | 0:a771927a62fd | 6092 | unsigned error = zlib_compress(&buffer, &buffersize, in, insize, &settings); |
embeddedartists | 0:a771927a62fd | 6093 | if(buffer) |
embeddedartists | 0:a771927a62fd | 6094 | { |
embeddedartists | 0:a771927a62fd | 6095 | out.insert(out.end(), &buffer[0], &buffer[buffersize]); |
embeddedartists | 0:a771927a62fd | 6096 | lodepng_free(buffer); |
embeddedartists | 0:a771927a62fd | 6097 | } |
embeddedartists | 0:a771927a62fd | 6098 | return error; |
embeddedartists | 0:a771927a62fd | 6099 | } |
embeddedartists | 0:a771927a62fd | 6100 | |
embeddedartists | 0:a771927a62fd | 6101 | unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, |
embeddedartists | 0:a771927a62fd | 6102 | const LodePNGCompressSettings& settings) |
embeddedartists | 0:a771927a62fd | 6103 | { |
embeddedartists | 0:a771927a62fd | 6104 | return compress(out, in.empty() ? 0 : &in[0], in.size(), settings); |
embeddedartists | 0:a771927a62fd | 6105 | } |
embeddedartists | 0:a771927a62fd | 6106 | #endif //LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 6107 | #endif //LODEPNG_COMPILE_ZLIB |
embeddedartists | 0:a771927a62fd | 6108 | |
embeddedartists | 0:a771927a62fd | 6109 | |
embeddedartists | 0:a771927a62fd | 6110 | #ifdef LODEPNG_COMPILE_PNG |
embeddedartists | 0:a771927a62fd | 6111 | |
embeddedartists | 0:a771927a62fd | 6112 | State::State() |
embeddedartists | 0:a771927a62fd | 6113 | { |
embeddedartists | 0:a771927a62fd | 6114 | lodepng_state_init(this); |
embeddedartists | 0:a771927a62fd | 6115 | } |
embeddedartists | 0:a771927a62fd | 6116 | |
embeddedartists | 0:a771927a62fd | 6117 | State::State(const State& other) |
embeddedartists | 0:a771927a62fd | 6118 | { |
embeddedartists | 0:a771927a62fd | 6119 | lodepng_state_init(this); |
embeddedartists | 0:a771927a62fd | 6120 | lodepng_state_copy(this, &other); |
embeddedartists | 0:a771927a62fd | 6121 | } |
embeddedartists | 0:a771927a62fd | 6122 | |
embeddedartists | 0:a771927a62fd | 6123 | State::~State() |
embeddedartists | 0:a771927a62fd | 6124 | { |
embeddedartists | 0:a771927a62fd | 6125 | lodepng_state_cleanup(this); |
embeddedartists | 0:a771927a62fd | 6126 | } |
embeddedartists | 0:a771927a62fd | 6127 | |
embeddedartists | 0:a771927a62fd | 6128 | State& State::operator=(const State& other) |
embeddedartists | 0:a771927a62fd | 6129 | { |
embeddedartists | 0:a771927a62fd | 6130 | lodepng_state_copy(this, &other); |
embeddedartists | 0:a771927a62fd | 6131 | return *this; |
embeddedartists | 0:a771927a62fd | 6132 | } |
embeddedartists | 0:a771927a62fd | 6133 | |
embeddedartists | 0:a771927a62fd | 6134 | #ifdef LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 6135 | |
embeddedartists | 0:a771927a62fd | 6136 | unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in, |
embeddedartists | 0:a771927a62fd | 6137 | size_t insize, LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 6138 | { |
embeddedartists | 0:a771927a62fd | 6139 | unsigned char* buffer; |
embeddedartists | 0:a771927a62fd | 6140 | unsigned error = lodepng_decode_memory(&buffer, &w, &h, in, insize, colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 6141 | if(buffer && !error) |
embeddedartists | 0:a771927a62fd | 6142 | { |
embeddedartists | 0:a771927a62fd | 6143 | State state; |
embeddedartists | 0:a771927a62fd | 6144 | state.info_raw.colortype = colortype; |
embeddedartists | 0:a771927a62fd | 6145 | state.info_raw.bitdepth = bitdepth; |
embeddedartists | 0:a771927a62fd | 6146 | size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw); |
embeddedartists | 0:a771927a62fd | 6147 | out.insert(out.end(), &buffer[0], &buffer[buffersize]); |
embeddedartists | 0:a771927a62fd | 6148 | lodepng_free(buffer); |
embeddedartists | 0:a771927a62fd | 6149 | } |
embeddedartists | 0:a771927a62fd | 6150 | return error; |
embeddedartists | 0:a771927a62fd | 6151 | } |
embeddedartists | 0:a771927a62fd | 6152 | |
embeddedartists | 0:a771927a62fd | 6153 | unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, |
embeddedartists | 0:a771927a62fd | 6154 | const std::vector<unsigned char>& in, LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 6155 | { |
embeddedartists | 0:a771927a62fd | 6156 | return decode(out, w, h, in.empty() ? 0 : &in[0], (unsigned)in.size(), colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 6157 | } |
embeddedartists | 0:a771927a62fd | 6158 | |
embeddedartists | 0:a771927a62fd | 6159 | unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, |
embeddedartists | 0:a771927a62fd | 6160 | State& state, |
embeddedartists | 0:a771927a62fd | 6161 | const unsigned char* in, size_t insize) |
embeddedartists | 0:a771927a62fd | 6162 | { |
embeddedartists | 0:a771927a62fd | 6163 | unsigned char* buffer = NULL; |
embeddedartists | 0:a771927a62fd | 6164 | unsigned error = lodepng_decode(&buffer, &w, &h, &state, in, insize); |
embeddedartists | 0:a771927a62fd | 6165 | if(buffer && !error) |
embeddedartists | 0:a771927a62fd | 6166 | { |
embeddedartists | 0:a771927a62fd | 6167 | size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw); |
embeddedartists | 0:a771927a62fd | 6168 | out.insert(out.end(), &buffer[0], &buffer[buffersize]); |
embeddedartists | 0:a771927a62fd | 6169 | } |
embeddedartists | 0:a771927a62fd | 6170 | lodepng_free(buffer); |
embeddedartists | 0:a771927a62fd | 6171 | return error; |
embeddedartists | 0:a771927a62fd | 6172 | } |
embeddedartists | 0:a771927a62fd | 6173 | |
embeddedartists | 0:a771927a62fd | 6174 | unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, |
embeddedartists | 0:a771927a62fd | 6175 | State& state, |
embeddedartists | 0:a771927a62fd | 6176 | const std::vector<unsigned char>& in) |
embeddedartists | 0:a771927a62fd | 6177 | { |
embeddedartists | 0:a771927a62fd | 6178 | return decode(out, w, h, state, in.empty() ? 0 : &in[0], in.size()); |
embeddedartists | 0:a771927a62fd | 6179 | } |
embeddedartists | 0:a771927a62fd | 6180 | |
embeddedartists | 0:a771927a62fd | 6181 | #ifdef LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 6182 | unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename, |
embeddedartists | 0:a771927a62fd | 6183 | LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 6184 | { |
embeddedartists | 0:a771927a62fd | 6185 | std::vector<unsigned char> buffer; |
embeddedartists | 0:a771927a62fd | 6186 | load_file(buffer, filename); |
embeddedartists | 0:a771927a62fd | 6187 | return decode(out, w, h, buffer, colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 6188 | } |
embeddedartists | 0:a771927a62fd | 6189 | #endif //LODEPNG_COMPILE_DECODER |
embeddedartists | 0:a771927a62fd | 6190 | #endif //LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 6191 | |
embeddedartists | 0:a771927a62fd | 6192 | #ifdef LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 6193 | unsigned encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 6194 | LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 6195 | { |
embeddedartists | 0:a771927a62fd | 6196 | unsigned char* buffer; |
embeddedartists | 0:a771927a62fd | 6197 | size_t buffersize; |
embeddedartists | 0:a771927a62fd | 6198 | unsigned error = lodepng_encode_memory(&buffer, &buffersize, in, w, h, colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 6199 | if(buffer) |
embeddedartists | 0:a771927a62fd | 6200 | { |
embeddedartists | 0:a771927a62fd | 6201 | out.insert(out.end(), &buffer[0], &buffer[buffersize]); |
embeddedartists | 0:a771927a62fd | 6202 | lodepng_free(buffer); |
embeddedartists | 0:a771927a62fd | 6203 | } |
embeddedartists | 0:a771927a62fd | 6204 | return error; |
embeddedartists | 0:a771927a62fd | 6205 | } |
embeddedartists | 0:a771927a62fd | 6206 | |
embeddedartists | 0:a771927a62fd | 6207 | unsigned encode(std::vector<unsigned char>& out, |
embeddedartists | 0:a771927a62fd | 6208 | const std::vector<unsigned char>& in, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 6209 | LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 6210 | { |
embeddedartists | 0:a771927a62fd | 6211 | if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84; |
embeddedartists | 0:a771927a62fd | 6212 | return encode(out, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 6213 | } |
embeddedartists | 0:a771927a62fd | 6214 | |
embeddedartists | 0:a771927a62fd | 6215 | unsigned encode(std::vector<unsigned char>& out, |
embeddedartists | 0:a771927a62fd | 6216 | const unsigned char* in, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 6217 | State& state) |
embeddedartists | 0:a771927a62fd | 6218 | { |
embeddedartists | 0:a771927a62fd | 6219 | unsigned char* buffer; |
embeddedartists | 0:a771927a62fd | 6220 | size_t buffersize; |
embeddedartists | 0:a771927a62fd | 6221 | unsigned error = lodepng_encode(&buffer, &buffersize, in, w, h, &state); |
embeddedartists | 0:a771927a62fd | 6222 | if(buffer) |
embeddedartists | 0:a771927a62fd | 6223 | { |
embeddedartists | 0:a771927a62fd | 6224 | out.insert(out.end(), &buffer[0], &buffer[buffersize]); |
embeddedartists | 0:a771927a62fd | 6225 | lodepng_free(buffer); |
embeddedartists | 0:a771927a62fd | 6226 | } |
embeddedartists | 0:a771927a62fd | 6227 | return error; |
embeddedartists | 0:a771927a62fd | 6228 | } |
embeddedartists | 0:a771927a62fd | 6229 | |
embeddedartists | 0:a771927a62fd | 6230 | unsigned encode(std::vector<unsigned char>& out, |
embeddedartists | 0:a771927a62fd | 6231 | const std::vector<unsigned char>& in, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 6232 | State& state) |
embeddedartists | 0:a771927a62fd | 6233 | { |
embeddedartists | 0:a771927a62fd | 6234 | if(lodepng_get_raw_size(w, h, &state.info_raw) > in.size()) return 84; |
embeddedartists | 0:a771927a62fd | 6235 | return encode(out, in.empty() ? 0 : &in[0], w, h, state); |
embeddedartists | 0:a771927a62fd | 6236 | } |
embeddedartists | 0:a771927a62fd | 6237 | |
embeddedartists | 0:a771927a62fd | 6238 | #ifdef LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 6239 | unsigned encode(const std::string& filename, |
embeddedartists | 0:a771927a62fd | 6240 | const unsigned char* in, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 6241 | LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 6242 | { |
embeddedartists | 0:a771927a62fd | 6243 | std::vector<unsigned char> buffer; |
embeddedartists | 0:a771927a62fd | 6244 | unsigned error = encode(buffer, in, w, h, colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 6245 | if(!error) save_file(buffer, filename); |
embeddedartists | 0:a771927a62fd | 6246 | return error; |
embeddedartists | 0:a771927a62fd | 6247 | } |
embeddedartists | 0:a771927a62fd | 6248 | |
embeddedartists | 0:a771927a62fd | 6249 | unsigned encode(const std::string& filename, |
embeddedartists | 0:a771927a62fd | 6250 | const std::vector<unsigned char>& in, unsigned w, unsigned h, |
embeddedartists | 0:a771927a62fd | 6251 | LodePNGColorType colortype, unsigned bitdepth) |
embeddedartists | 0:a771927a62fd | 6252 | { |
embeddedartists | 0:a771927a62fd | 6253 | if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84; |
embeddedartists | 0:a771927a62fd | 6254 | return encode(filename, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth); |
embeddedartists | 0:a771927a62fd | 6255 | } |
embeddedartists | 0:a771927a62fd | 6256 | #endif //LODEPNG_COMPILE_DISK |
embeddedartists | 0:a771927a62fd | 6257 | #endif //LODEPNG_COMPILE_ENCODER |
embeddedartists | 0:a771927a62fd | 6258 | #endif //LODEPNG_COMPILE_PNG |
embeddedartists | 0:a771927a62fd | 6259 | } //namespace lodepng |
embeddedartists | 0:a771927a62fd | 6260 | #endif /*LODEPNG_COMPILE_CPP*/ |