Wei Chang Shen / DMemWin

Dependencies:   emwin_lib

Fork of DMemWin by Embedded Artists

png/pngwutil.c@2:0e2ef1edf01b, 2016-06-02 (annotated)

Committer:
destinyXfate
Date:
Thu Jun 02 04:52:54 2016 +0000
Revision:
2:0e2ef1edf01b
;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
destinyXfate 2:0e2ef1edf01b 1
destinyXfate 2:0e2ef1edf01b 2 /* pngwutil.c - utilities to write a PNG file
destinyXfate 2:0e2ef1edf01b 3 *
destinyXfate 2:0e2ef1edf01b 4 * Last changed in libpng 1.2.15 January 5, 2007
destinyXfate 2:0e2ef1edf01b 5 * For conditions of distribution and use, see copyright notice in png.h
destinyXfate 2:0e2ef1edf01b 6 * Copyright (c) 1998-2007 Glenn Randers-Pehrson
destinyXfate 2:0e2ef1edf01b 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
destinyXfate 2:0e2ef1edf01b 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
destinyXfate 2:0e2ef1edf01b 9 */
destinyXfate 2:0e2ef1edf01b 10
destinyXfate 2:0e2ef1edf01b 11 #define PNG_INTERNAL
destinyXfate 2:0e2ef1edf01b 12 #include "png.h"
destinyXfate 2:0e2ef1edf01b 13 #ifdef PNG_WRITE_SUPPORTED
destinyXfate 2:0e2ef1edf01b 14
destinyXfate 2:0e2ef1edf01b 15 /* Place a 32-bit number into a buffer in PNG byte order. We work
destinyXfate 2:0e2ef1edf01b 16 * with unsigned numbers for convenience, although one supported
destinyXfate 2:0e2ef1edf01b 17 * ancillary chunk uses signed (two's complement) numbers.
destinyXfate 2:0e2ef1edf01b 18 */
destinyXfate 2:0e2ef1edf01b 19 void PNGAPI
destinyXfate 2:0e2ef1edf01b 20 png_save_uint_32(png_bytep buf, png_uint_32 i)
destinyXfate 2:0e2ef1edf01b 21 {
destinyXfate 2:0e2ef1edf01b 22 buf[0] = (png_byte)((i >> 24) & 0xff);
destinyXfate 2:0e2ef1edf01b 23 buf[1] = (png_byte)((i >> 16) & 0xff);
destinyXfate 2:0e2ef1edf01b 24 buf[2] = (png_byte)((i >> 8) & 0xff);
destinyXfate 2:0e2ef1edf01b 25 buf[3] = (png_byte)(i & 0xff);
destinyXfate 2:0e2ef1edf01b 26 }
destinyXfate 2:0e2ef1edf01b 27
destinyXfate 2:0e2ef1edf01b 28 /* The png_save_int_32 function assumes integers are stored in two's
destinyXfate 2:0e2ef1edf01b 29 * complement format. If this isn't the case, then this routine needs to
destinyXfate 2:0e2ef1edf01b 30 * be modified to write data in two's complement format.
destinyXfate 2:0e2ef1edf01b 31 */
destinyXfate 2:0e2ef1edf01b 32 void PNGAPI
destinyXfate 2:0e2ef1edf01b 33 png_save_int_32(png_bytep buf, png_int_32 i)
destinyXfate 2:0e2ef1edf01b 34 {
destinyXfate 2:0e2ef1edf01b 35 buf[0] = (png_byte)((i >> 24) & 0xff);
destinyXfate 2:0e2ef1edf01b 36 buf[1] = (png_byte)((i >> 16) & 0xff);
destinyXfate 2:0e2ef1edf01b 37 buf[2] = (png_byte)((i >> 8) & 0xff);
destinyXfate 2:0e2ef1edf01b 38 buf[3] = (png_byte)(i & 0xff);
destinyXfate 2:0e2ef1edf01b 39 }
destinyXfate 2:0e2ef1edf01b 40
destinyXfate 2:0e2ef1edf01b 41 /* Place a 16-bit number into a buffer in PNG byte order.
destinyXfate 2:0e2ef1edf01b 42 * The parameter is declared unsigned int, not png_uint_16,
destinyXfate 2:0e2ef1edf01b 43 * just to avoid potential problems on pre-ANSI C compilers.
destinyXfate 2:0e2ef1edf01b 44 */
destinyXfate 2:0e2ef1edf01b 45 void PNGAPI
destinyXfate 2:0e2ef1edf01b 46 png_save_uint_16(png_bytep buf, unsigned int i)
destinyXfate 2:0e2ef1edf01b 47 {
destinyXfate 2:0e2ef1edf01b 48 buf[0] = (png_byte)((i >> 8) & 0xff);
destinyXfate 2:0e2ef1edf01b 49 buf[1] = (png_byte)(i & 0xff);
destinyXfate 2:0e2ef1edf01b 50 }
destinyXfate 2:0e2ef1edf01b 51
destinyXfate 2:0e2ef1edf01b 52 /* Write a PNG chunk all at once. The type is an array of ASCII characters
destinyXfate 2:0e2ef1edf01b 53 * representing the chunk name. The array must be at least 4 bytes in
destinyXfate 2:0e2ef1edf01b 54 * length, and does not need to be null terminated. To be safe, pass the
destinyXfate 2:0e2ef1edf01b 55 * pre-defined chunk names here, and if you need a new one, define it
destinyXfate 2:0e2ef1edf01b 56 * where the others are defined. The length is the length of the data.
destinyXfate 2:0e2ef1edf01b 57 * All the data must be present. If that is not possible, use the
destinyXfate 2:0e2ef1edf01b 58 * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end()
destinyXfate 2:0e2ef1edf01b 59 * functions instead.
destinyXfate 2:0e2ef1edf01b 60 */
destinyXfate 2:0e2ef1edf01b 61 void PNGAPI
destinyXfate 2:0e2ef1edf01b 62 png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
destinyXfate 2:0e2ef1edf01b 63 png_bytep data, png_size_t length)
destinyXfate 2:0e2ef1edf01b 64 {
destinyXfate 2:0e2ef1edf01b 65 if(png_ptr == NULL) return;
destinyXfate 2:0e2ef1edf01b 66 png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length);
destinyXfate 2:0e2ef1edf01b 67 png_write_chunk_data(png_ptr, data, length);
destinyXfate 2:0e2ef1edf01b 68 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 69 }
destinyXfate 2:0e2ef1edf01b 70
destinyXfate 2:0e2ef1edf01b 71 /* Write the start of a PNG chunk. The type is the chunk type.
destinyXfate 2:0e2ef1edf01b 72 * The total_length is the sum of the lengths of all the data you will be
destinyXfate 2:0e2ef1edf01b 73 * passing in png_write_chunk_data().
destinyXfate 2:0e2ef1edf01b 74 */
destinyXfate 2:0e2ef1edf01b 75 void PNGAPI
destinyXfate 2:0e2ef1edf01b 76 png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
destinyXfate 2:0e2ef1edf01b 77 png_uint_32 length)
destinyXfate 2:0e2ef1edf01b 78 {
destinyXfate 2:0e2ef1edf01b 79 png_byte buf[4];
destinyXfate 2:0e2ef1edf01b 80 png_debug2(0, "Writing %s chunk (%lu bytes)\n", chunk_name, length);
destinyXfate 2:0e2ef1edf01b 81 if(png_ptr == NULL) return;
destinyXfate 2:0e2ef1edf01b 82
destinyXfate 2:0e2ef1edf01b 83 /* write the length */
destinyXfate 2:0e2ef1edf01b 84 png_save_uint_32(buf, length);
destinyXfate 2:0e2ef1edf01b 85 png_write_data(png_ptr, buf, (png_size_t)4);
destinyXfate 2:0e2ef1edf01b 86
destinyXfate 2:0e2ef1edf01b 87 /* write the chunk name */
destinyXfate 2:0e2ef1edf01b 88 png_write_data(png_ptr, chunk_name, (png_size_t)4);
destinyXfate 2:0e2ef1edf01b 89 /* reset the crc and run it over the chunk name */
destinyXfate 2:0e2ef1edf01b 90 png_reset_crc(png_ptr);
destinyXfate 2:0e2ef1edf01b 91 png_calculate_crc(png_ptr, chunk_name, (png_size_t)4);
destinyXfate 2:0e2ef1edf01b 92 }
destinyXfate 2:0e2ef1edf01b 93
destinyXfate 2:0e2ef1edf01b 94 /* Write the data of a PNG chunk started with png_write_chunk_start().
destinyXfate 2:0e2ef1edf01b 95 * Note that multiple calls to this function are allowed, and that the
destinyXfate 2:0e2ef1edf01b 96 * sum of the lengths from these calls *must* add up to the total_length
destinyXfate 2:0e2ef1edf01b 97 * given to png_write_chunk_start().
destinyXfate 2:0e2ef1edf01b 98 */
destinyXfate 2:0e2ef1edf01b 99 void PNGAPI
destinyXfate 2:0e2ef1edf01b 100 png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
destinyXfate 2:0e2ef1edf01b 101 {
destinyXfate 2:0e2ef1edf01b 102 /* write the data, and run the CRC over it */
destinyXfate 2:0e2ef1edf01b 103 if(png_ptr == NULL) return;
destinyXfate 2:0e2ef1edf01b 104 if (data != NULL && length > 0)
destinyXfate 2:0e2ef1edf01b 105 {
destinyXfate 2:0e2ef1edf01b 106 png_calculate_crc(png_ptr, data, length);
destinyXfate 2:0e2ef1edf01b 107 png_write_data(png_ptr, data, length);
destinyXfate 2:0e2ef1edf01b 108 }
destinyXfate 2:0e2ef1edf01b 109 }
destinyXfate 2:0e2ef1edf01b 110
destinyXfate 2:0e2ef1edf01b 111 /* Finish a chunk started with png_write_chunk_start(). */
destinyXfate 2:0e2ef1edf01b 112 void PNGAPI
destinyXfate 2:0e2ef1edf01b 113 png_write_chunk_end(png_structp png_ptr)
destinyXfate 2:0e2ef1edf01b 114 {
destinyXfate 2:0e2ef1edf01b 115 png_byte buf[4];
destinyXfate 2:0e2ef1edf01b 116
destinyXfate 2:0e2ef1edf01b 117 if(png_ptr == NULL) return;
destinyXfate 2:0e2ef1edf01b 118
destinyXfate 2:0e2ef1edf01b 119 /* write the crc */
destinyXfate 2:0e2ef1edf01b 120 png_save_uint_32(buf, png_ptr->crc);
destinyXfate 2:0e2ef1edf01b 121
destinyXfate 2:0e2ef1edf01b 122 png_write_data(png_ptr, buf, (png_size_t)4);
destinyXfate 2:0e2ef1edf01b 123 }
destinyXfate 2:0e2ef1edf01b 124
destinyXfate 2:0e2ef1edf01b 125 /* Simple function to write the signature. If we have already written
destinyXfate 2:0e2ef1edf01b 126 * the magic bytes of the signature, or more likely, the PNG stream is
destinyXfate 2:0e2ef1edf01b 127 * being embedded into another stream and doesn't need its own signature,
destinyXfate 2:0e2ef1edf01b 128 * we should call png_set_sig_bytes() to tell libpng how many of the
destinyXfate 2:0e2ef1edf01b 129 * bytes have already been written.
destinyXfate 2:0e2ef1edf01b 130 */
destinyXfate 2:0e2ef1edf01b 131 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 132 png_write_sig(png_structp png_ptr)
destinyXfate 2:0e2ef1edf01b 133 {
destinyXfate 2:0e2ef1edf01b 134 png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
destinyXfate 2:0e2ef1edf01b 135 /* write the rest of the 8 byte signature */
destinyXfate 2:0e2ef1edf01b 136 png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
destinyXfate 2:0e2ef1edf01b 137 (png_size_t)8 - png_ptr->sig_bytes);
destinyXfate 2:0e2ef1edf01b 138 if(png_ptr->sig_bytes < 3)
destinyXfate 2:0e2ef1edf01b 139 png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
destinyXfate 2:0e2ef1edf01b 140 }
destinyXfate 2:0e2ef1edf01b 141
destinyXfate 2:0e2ef1edf01b 142 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 143 /*
destinyXfate 2:0e2ef1edf01b 144 * This pair of functions encapsulates the operation of (a) compressing a
destinyXfate 2:0e2ef1edf01b 145 * text string, and (b) issuing it later as a series of chunk data writes.
destinyXfate 2:0e2ef1edf01b 146 * The compression_state structure is shared context for these functions
destinyXfate 2:0e2ef1edf01b 147 * set up by the caller in order to make the whole mess thread-safe.
destinyXfate 2:0e2ef1edf01b 148 */
destinyXfate 2:0e2ef1edf01b 149
destinyXfate 2:0e2ef1edf01b 150 typedef struct
destinyXfate 2:0e2ef1edf01b 151 {
destinyXfate 2:0e2ef1edf01b 152 char *input; /* the uncompressed input data */
destinyXfate 2:0e2ef1edf01b 153 int input_len; /* its length */
destinyXfate 2:0e2ef1edf01b 154 int num_output_ptr; /* number of output pointers used */
destinyXfate 2:0e2ef1edf01b 155 int max_output_ptr; /* size of output_ptr */
destinyXfate 2:0e2ef1edf01b 156 png_charpp output_ptr; /* array of pointers to output */
destinyXfate 2:0e2ef1edf01b 157 } compression_state;
destinyXfate 2:0e2ef1edf01b 158
destinyXfate 2:0e2ef1edf01b 159 /* compress given text into storage in the png_ptr structure */
destinyXfate 2:0e2ef1edf01b 160 static int /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 161 png_text_compress(png_structp png_ptr,
destinyXfate 2:0e2ef1edf01b 162 png_charp text, png_size_t text_len, int compression,
destinyXfate 2:0e2ef1edf01b 163 compression_state *comp)
destinyXfate 2:0e2ef1edf01b 164 {
destinyXfate 2:0e2ef1edf01b 165 int ret;
destinyXfate 2:0e2ef1edf01b 166
destinyXfate 2:0e2ef1edf01b 167 comp->num_output_ptr = 0;
destinyXfate 2:0e2ef1edf01b 168 comp->max_output_ptr = 0;
destinyXfate 2:0e2ef1edf01b 169 comp->output_ptr = NULL;
destinyXfate 2:0e2ef1edf01b 170 comp->input = NULL;
destinyXfate 2:0e2ef1edf01b 171 comp->input_len = 0;
destinyXfate 2:0e2ef1edf01b 172
destinyXfate 2:0e2ef1edf01b 173 /* we may just want to pass the text right through */
destinyXfate 2:0e2ef1edf01b 174 if (compression == PNG_TEXT_COMPRESSION_NONE)
destinyXfate 2:0e2ef1edf01b 175 {
destinyXfate 2:0e2ef1edf01b 176 comp->input = text;
destinyXfate 2:0e2ef1edf01b 177 comp->input_len = text_len;
destinyXfate 2:0e2ef1edf01b 178 return((int)text_len);
destinyXfate 2:0e2ef1edf01b 179 }
destinyXfate 2:0e2ef1edf01b 180
destinyXfate 2:0e2ef1edf01b 181 if (compression >= PNG_TEXT_COMPRESSION_LAST)
destinyXfate 2:0e2ef1edf01b 182 {
destinyXfate 2:0e2ef1edf01b 183 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
destinyXfate 2:0e2ef1edf01b 184 char msg[50];
destinyXfate 2:0e2ef1edf01b 185 sprintf(msg, "Unknown compression type %d", compression);
destinyXfate 2:0e2ef1edf01b 186 png_warning(png_ptr, msg);
destinyXfate 2:0e2ef1edf01b 187 #else
destinyXfate 2:0e2ef1edf01b 188 png_warning(png_ptr, "Unknown compression type");
destinyXfate 2:0e2ef1edf01b 189 #endif
destinyXfate 2:0e2ef1edf01b 190 }
destinyXfate 2:0e2ef1edf01b 191
destinyXfate 2:0e2ef1edf01b 192 /* We can't write the chunk until we find out how much data we have,
destinyXfate 2:0e2ef1edf01b 193 * which means we need to run the compressor first and save the
destinyXfate 2:0e2ef1edf01b 194 * output. This shouldn't be a problem, as the vast majority of
destinyXfate 2:0e2ef1edf01b 195 * comments should be reasonable, but we will set up an array of
destinyXfate 2:0e2ef1edf01b 196 * malloc'd pointers to be sure.
destinyXfate 2:0e2ef1edf01b 197 *
destinyXfate 2:0e2ef1edf01b 198 * If we knew the application was well behaved, we could simplify this
destinyXfate 2:0e2ef1edf01b 199 * greatly by assuming we can always malloc an output buffer large
destinyXfate 2:0e2ef1edf01b 200 * enough to hold the compressed text ((1001 * text_len / 1000) + 12)
destinyXfate 2:0e2ef1edf01b 201 * and malloc this directly. The only time this would be a bad idea is
destinyXfate 2:0e2ef1edf01b 202 * if we can't malloc more than 64K and we have 64K of random input
destinyXfate 2:0e2ef1edf01b 203 * data, or if the input string is incredibly large (although this
destinyXfate 2:0e2ef1edf01b 204 * wouldn't cause a failure, just a slowdown due to swapping).
destinyXfate 2:0e2ef1edf01b 205 */
destinyXfate 2:0e2ef1edf01b 206
destinyXfate 2:0e2ef1edf01b 207 /* set up the compression buffers */
destinyXfate 2:0e2ef1edf01b 208 png_ptr->zstream.avail_in = (uInt)text_len;
destinyXfate 2:0e2ef1edf01b 209 png_ptr->zstream.next_in = (Bytef *)text;
destinyXfate 2:0e2ef1edf01b 210 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
destinyXfate 2:0e2ef1edf01b 211 png_ptr->zstream.next_out = (Bytef *)png_ptr->zbuf;
destinyXfate 2:0e2ef1edf01b 212
destinyXfate 2:0e2ef1edf01b 213 /* this is the same compression loop as in png_write_row() */
destinyXfate 2:0e2ef1edf01b 214 do
destinyXfate 2:0e2ef1edf01b 215 {
destinyXfate 2:0e2ef1edf01b 216 /* compress the data */
destinyXfate 2:0e2ef1edf01b 217 ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
destinyXfate 2:0e2ef1edf01b 218 if (ret != Z_OK)
destinyXfate 2:0e2ef1edf01b 219 {
destinyXfate 2:0e2ef1edf01b 220 /* error */
destinyXfate 2:0e2ef1edf01b 221 if (png_ptr->zstream.msg != NULL)
destinyXfate 2:0e2ef1edf01b 222 png_error(png_ptr, png_ptr->zstream.msg);
destinyXfate 2:0e2ef1edf01b 223 else
destinyXfate 2:0e2ef1edf01b 224 png_error(png_ptr, "zlib error");
destinyXfate 2:0e2ef1edf01b 225 }
destinyXfate 2:0e2ef1edf01b 226 /* check to see if we need more room */
destinyXfate 2:0e2ef1edf01b 227 if (!(png_ptr->zstream.avail_out))
destinyXfate 2:0e2ef1edf01b 228 {
destinyXfate 2:0e2ef1edf01b 229 /* make sure the output array has room */
destinyXfate 2:0e2ef1edf01b 230 if (comp->num_output_ptr >= comp->max_output_ptr)
destinyXfate 2:0e2ef1edf01b 231 {
destinyXfate 2:0e2ef1edf01b 232 int old_max;
destinyXfate 2:0e2ef1edf01b 233
destinyXfate 2:0e2ef1edf01b 234 old_max = comp->max_output_ptr;
destinyXfate 2:0e2ef1edf01b 235 comp->max_output_ptr = comp->num_output_ptr + 4;
destinyXfate 2:0e2ef1edf01b 236 if (comp->output_ptr != NULL)
destinyXfate 2:0e2ef1edf01b 237 {
destinyXfate 2:0e2ef1edf01b 238 png_charpp old_ptr;
destinyXfate 2:0e2ef1edf01b 239
destinyXfate 2:0e2ef1edf01b 240 old_ptr = comp->output_ptr;
destinyXfate 2:0e2ef1edf01b 241 comp->output_ptr = (png_charpp)png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 242 (png_uint_32)(comp->max_output_ptr *
destinyXfate 2:0e2ef1edf01b 243 png_sizeof (png_charpp)));
destinyXfate 2:0e2ef1edf01b 244 png_memcpy(comp->output_ptr, old_ptr, old_max
destinyXfate 2:0e2ef1edf01b 245 * png_sizeof (png_charp));
destinyXfate 2:0e2ef1edf01b 246 png_free(png_ptr, old_ptr);
destinyXfate 2:0e2ef1edf01b 247 }
destinyXfate 2:0e2ef1edf01b 248 else
destinyXfate 2:0e2ef1edf01b 249 comp->output_ptr = (png_charpp)png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 250 (png_uint_32)(comp->max_output_ptr *
destinyXfate 2:0e2ef1edf01b 251 png_sizeof (png_charp)));
destinyXfate 2:0e2ef1edf01b 252 }
destinyXfate 2:0e2ef1edf01b 253
destinyXfate 2:0e2ef1edf01b 254 /* save the data */
destinyXfate 2:0e2ef1edf01b 255 comp->output_ptr[comp->num_output_ptr] = (png_charp)png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 256 (png_uint_32)png_ptr->zbuf_size);
destinyXfate 2:0e2ef1edf01b 257 png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
destinyXfate 2:0e2ef1edf01b 258 png_ptr->zbuf_size);
destinyXfate 2:0e2ef1edf01b 259 comp->num_output_ptr++;
destinyXfate 2:0e2ef1edf01b 260
destinyXfate 2:0e2ef1edf01b 261 /* and reset the buffer */
destinyXfate 2:0e2ef1edf01b 262 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
destinyXfate 2:0e2ef1edf01b 263 png_ptr->zstream.next_out = png_ptr->zbuf;
destinyXfate 2:0e2ef1edf01b 264 }
destinyXfate 2:0e2ef1edf01b 265 /* continue until we don't have any more to compress */
destinyXfate 2:0e2ef1edf01b 266 } while (png_ptr->zstream.avail_in);
destinyXfate 2:0e2ef1edf01b 267
destinyXfate 2:0e2ef1edf01b 268 /* finish the compression */
destinyXfate 2:0e2ef1edf01b 269 do
destinyXfate 2:0e2ef1edf01b 270 {
destinyXfate 2:0e2ef1edf01b 271 /* tell zlib we are finished */
destinyXfate 2:0e2ef1edf01b 272 ret = deflate(&png_ptr->zstream, Z_FINISH);
destinyXfate 2:0e2ef1edf01b 273
destinyXfate 2:0e2ef1edf01b 274 if (ret == Z_OK)
destinyXfate 2:0e2ef1edf01b 275 {
destinyXfate 2:0e2ef1edf01b 276 /* check to see if we need more room */
destinyXfate 2:0e2ef1edf01b 277 if (!(png_ptr->zstream.avail_out))
destinyXfate 2:0e2ef1edf01b 278 {
destinyXfate 2:0e2ef1edf01b 279 /* check to make sure our output array has room */
destinyXfate 2:0e2ef1edf01b 280 if (comp->num_output_ptr >= comp->max_output_ptr)
destinyXfate 2:0e2ef1edf01b 281 {
destinyXfate 2:0e2ef1edf01b 282 int old_max;
destinyXfate 2:0e2ef1edf01b 283
destinyXfate 2:0e2ef1edf01b 284 old_max = comp->max_output_ptr;
destinyXfate 2:0e2ef1edf01b 285 comp->max_output_ptr = comp->num_output_ptr + 4;
destinyXfate 2:0e2ef1edf01b 286 if (comp->output_ptr != NULL)
destinyXfate 2:0e2ef1edf01b 287 {
destinyXfate 2:0e2ef1edf01b 288 png_charpp old_ptr;
destinyXfate 2:0e2ef1edf01b 289
destinyXfate 2:0e2ef1edf01b 290 old_ptr = comp->output_ptr;
destinyXfate 2:0e2ef1edf01b 291 /* This could be optimized to realloc() */
destinyXfate 2:0e2ef1edf01b 292 comp->output_ptr = (png_charpp)png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 293 (png_uint_32)(comp->max_output_ptr *
destinyXfate 2:0e2ef1edf01b 294 png_sizeof (png_charpp)));
destinyXfate 2:0e2ef1edf01b 295 png_memcpy(comp->output_ptr, old_ptr,
destinyXfate 2:0e2ef1edf01b 296 old_max * png_sizeof (png_charp));
destinyXfate 2:0e2ef1edf01b 297 png_free(png_ptr, old_ptr);
destinyXfate 2:0e2ef1edf01b 298 }
destinyXfate 2:0e2ef1edf01b 299 else
destinyXfate 2:0e2ef1edf01b 300 comp->output_ptr = (png_charpp)png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 301 (png_uint_32)(comp->max_output_ptr *
destinyXfate 2:0e2ef1edf01b 302 png_sizeof (png_charp)));
destinyXfate 2:0e2ef1edf01b 303 }
destinyXfate 2:0e2ef1edf01b 304
destinyXfate 2:0e2ef1edf01b 305 /* save off the data */
destinyXfate 2:0e2ef1edf01b 306 comp->output_ptr[comp->num_output_ptr] =
destinyXfate 2:0e2ef1edf01b 307 (png_charp)png_malloc(png_ptr, (png_uint_32)png_ptr->zbuf_size);
destinyXfate 2:0e2ef1edf01b 308 png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
destinyXfate 2:0e2ef1edf01b 309 png_ptr->zbuf_size);
destinyXfate 2:0e2ef1edf01b 310 comp->num_output_ptr++;
destinyXfate 2:0e2ef1edf01b 311
destinyXfate 2:0e2ef1edf01b 312 /* and reset the buffer pointers */
destinyXfate 2:0e2ef1edf01b 313 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
destinyXfate 2:0e2ef1edf01b 314 png_ptr->zstream.next_out = png_ptr->zbuf;
destinyXfate 2:0e2ef1edf01b 315 }
destinyXfate 2:0e2ef1edf01b 316 }
destinyXfate 2:0e2ef1edf01b 317 else if (ret != Z_STREAM_END)
destinyXfate 2:0e2ef1edf01b 318 {
destinyXfate 2:0e2ef1edf01b 319 /* we got an error */
destinyXfate 2:0e2ef1edf01b 320 if (png_ptr->zstream.msg != NULL)
destinyXfate 2:0e2ef1edf01b 321 png_error(png_ptr, png_ptr->zstream.msg);
destinyXfate 2:0e2ef1edf01b 322 else
destinyXfate 2:0e2ef1edf01b 323 png_error(png_ptr, "zlib error");
destinyXfate 2:0e2ef1edf01b 324 }
destinyXfate 2:0e2ef1edf01b 325 } while (ret != Z_STREAM_END);
destinyXfate 2:0e2ef1edf01b 326
destinyXfate 2:0e2ef1edf01b 327 /* text length is number of buffers plus last buffer */
destinyXfate 2:0e2ef1edf01b 328 text_len = png_ptr->zbuf_size * comp->num_output_ptr;
destinyXfate 2:0e2ef1edf01b 329 if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
destinyXfate 2:0e2ef1edf01b 330 text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out;
destinyXfate 2:0e2ef1edf01b 331
destinyXfate 2:0e2ef1edf01b 332 return((int)text_len);
destinyXfate 2:0e2ef1edf01b 333 }
destinyXfate 2:0e2ef1edf01b 334
destinyXfate 2:0e2ef1edf01b 335 /* ship the compressed text out via chunk writes */
destinyXfate 2:0e2ef1edf01b 336 static void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 337 png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
destinyXfate 2:0e2ef1edf01b 338 {
destinyXfate 2:0e2ef1edf01b 339 int i;
destinyXfate 2:0e2ef1edf01b 340
destinyXfate 2:0e2ef1edf01b 341 /* handle the no-compression case */
destinyXfate 2:0e2ef1edf01b 342 if (comp->input)
destinyXfate 2:0e2ef1edf01b 343 {
destinyXfate 2:0e2ef1edf01b 344 png_write_chunk_data(png_ptr, (png_bytep)comp->input,
destinyXfate 2:0e2ef1edf01b 345 (png_size_t)comp->input_len);
destinyXfate 2:0e2ef1edf01b 346 return;
destinyXfate 2:0e2ef1edf01b 347 }
destinyXfate 2:0e2ef1edf01b 348
destinyXfate 2:0e2ef1edf01b 349 /* write saved output buffers, if any */
destinyXfate 2:0e2ef1edf01b 350 for (i = 0; i < comp->num_output_ptr; i++)
destinyXfate 2:0e2ef1edf01b 351 {
destinyXfate 2:0e2ef1edf01b 352 png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],
destinyXfate 2:0e2ef1edf01b 353 png_ptr->zbuf_size);
destinyXfate 2:0e2ef1edf01b 354 png_free(png_ptr, comp->output_ptr[i]);
destinyXfate 2:0e2ef1edf01b 355 comp->output_ptr[i]=NULL;
destinyXfate 2:0e2ef1edf01b 356 }
destinyXfate 2:0e2ef1edf01b 357 if (comp->max_output_ptr != 0)
destinyXfate 2:0e2ef1edf01b 358 png_free(png_ptr, comp->output_ptr);
destinyXfate 2:0e2ef1edf01b 359 comp->output_ptr=NULL;
destinyXfate 2:0e2ef1edf01b 360 /* write anything left in zbuf */
destinyXfate 2:0e2ef1edf01b 361 if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size)
destinyXfate 2:0e2ef1edf01b 362 png_write_chunk_data(png_ptr, png_ptr->zbuf,
destinyXfate 2:0e2ef1edf01b 363 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
destinyXfate 2:0e2ef1edf01b 364
destinyXfate 2:0e2ef1edf01b 365 /* reset zlib for another zTXt/iTXt or image data */
destinyXfate 2:0e2ef1edf01b 366 deflateReset(&png_ptr->zstream);
destinyXfate 2:0e2ef1edf01b 367 png_ptr->zstream.data_type = Z_BINARY;
destinyXfate 2:0e2ef1edf01b 368 }
destinyXfate 2:0e2ef1edf01b 369 #endif
destinyXfate 2:0e2ef1edf01b 370
destinyXfate 2:0e2ef1edf01b 371 /* Write the IHDR chunk, and update the png_struct with the necessary
destinyXfate 2:0e2ef1edf01b 372 * information. Note that the rest of this code depends upon this
destinyXfate 2:0e2ef1edf01b 373 * information being correct.
destinyXfate 2:0e2ef1edf01b 374 */
destinyXfate 2:0e2ef1edf01b 375 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 376 png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
destinyXfate 2:0e2ef1edf01b 377 int bit_depth, int color_type, int compression_type, int filter_type,
destinyXfate 2:0e2ef1edf01b 378 int interlace_type)
destinyXfate 2:0e2ef1edf01b 379 {
destinyXfate 2:0e2ef1edf01b 380 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 381 PNG_IHDR;
destinyXfate 2:0e2ef1edf01b 382 #endif
destinyXfate 2:0e2ef1edf01b 383 png_byte buf[13]; /* buffer to store the IHDR info */
destinyXfate 2:0e2ef1edf01b 384
destinyXfate 2:0e2ef1edf01b 385 png_debug(1, "in png_write_IHDR\n");
destinyXfate 2:0e2ef1edf01b 386 /* Check that we have valid input data from the application info */
destinyXfate 2:0e2ef1edf01b 387 switch (color_type)
destinyXfate 2:0e2ef1edf01b 388 {
destinyXfate 2:0e2ef1edf01b 389 case PNG_COLOR_TYPE_GRAY:
destinyXfate 2:0e2ef1edf01b 390 switch (bit_depth)
destinyXfate 2:0e2ef1edf01b 391 {
destinyXfate 2:0e2ef1edf01b 392 case 1:
destinyXfate 2:0e2ef1edf01b 393 case 2:
destinyXfate 2:0e2ef1edf01b 394 case 4:
destinyXfate 2:0e2ef1edf01b 395 case 8:
destinyXfate 2:0e2ef1edf01b 396 case 16: png_ptr->channels = 1; break;
destinyXfate 2:0e2ef1edf01b 397 default: png_error(png_ptr,"Invalid bit depth for grayscale image");
destinyXfate 2:0e2ef1edf01b 398 }
destinyXfate 2:0e2ef1edf01b 399 break;
destinyXfate 2:0e2ef1edf01b 400 case PNG_COLOR_TYPE_RGB:
destinyXfate 2:0e2ef1edf01b 401 if (bit_depth != 8 && bit_depth != 16)
destinyXfate 2:0e2ef1edf01b 402 png_error(png_ptr, "Invalid bit depth for RGB image");
destinyXfate 2:0e2ef1edf01b 403 png_ptr->channels = 3;
destinyXfate 2:0e2ef1edf01b 404 break;
destinyXfate 2:0e2ef1edf01b 405 case PNG_COLOR_TYPE_PALETTE:
destinyXfate 2:0e2ef1edf01b 406 switch (bit_depth)
destinyXfate 2:0e2ef1edf01b 407 {
destinyXfate 2:0e2ef1edf01b 408 case 1:
destinyXfate 2:0e2ef1edf01b 409 case 2:
destinyXfate 2:0e2ef1edf01b 410 case 4:
destinyXfate 2:0e2ef1edf01b 411 case 8: png_ptr->channels = 1; break;
destinyXfate 2:0e2ef1edf01b 412 default: png_error(png_ptr, "Invalid bit depth for paletted image");
destinyXfate 2:0e2ef1edf01b 413 }
destinyXfate 2:0e2ef1edf01b 414 break;
destinyXfate 2:0e2ef1edf01b 415 case PNG_COLOR_TYPE_GRAY_ALPHA:
destinyXfate 2:0e2ef1edf01b 416 if (bit_depth != 8 && bit_depth != 16)
destinyXfate 2:0e2ef1edf01b 417 png_error(png_ptr, "Invalid bit depth for grayscale+alpha image");
destinyXfate 2:0e2ef1edf01b 418 png_ptr->channels = 2;
destinyXfate 2:0e2ef1edf01b 419 break;
destinyXfate 2:0e2ef1edf01b 420 case PNG_COLOR_TYPE_RGB_ALPHA:
destinyXfate 2:0e2ef1edf01b 421 if (bit_depth != 8 && bit_depth != 16)
destinyXfate 2:0e2ef1edf01b 422 png_error(png_ptr, "Invalid bit depth for RGBA image");
destinyXfate 2:0e2ef1edf01b 423 png_ptr->channels = 4;
destinyXfate 2:0e2ef1edf01b 424 break;
destinyXfate 2:0e2ef1edf01b 425 default:
destinyXfate 2:0e2ef1edf01b 426 png_error(png_ptr, "Invalid image color type specified");
destinyXfate 2:0e2ef1edf01b 427 }
destinyXfate 2:0e2ef1edf01b 428
destinyXfate 2:0e2ef1edf01b 429 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
destinyXfate 2:0e2ef1edf01b 430 {
destinyXfate 2:0e2ef1edf01b 431 png_warning(png_ptr, "Invalid compression type specified");
destinyXfate 2:0e2ef1edf01b 432 compression_type = PNG_COMPRESSION_TYPE_BASE;
destinyXfate 2:0e2ef1edf01b 433 }
destinyXfate 2:0e2ef1edf01b 434
destinyXfate 2:0e2ef1edf01b 435 /* Write filter_method 64 (intrapixel differencing) only if
destinyXfate 2:0e2ef1edf01b 436 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
destinyXfate 2:0e2ef1edf01b 437 * 2. Libpng did not write a PNG signature (this filter_method is only
destinyXfate 2:0e2ef1edf01b 438 * used in PNG datastreams that are embedded in MNG datastreams) and
destinyXfate 2:0e2ef1edf01b 439 * 3. The application called png_permit_mng_features with a mask that
destinyXfate 2:0e2ef1edf01b 440 * included PNG_FLAG_MNG_FILTER_64 and
destinyXfate 2:0e2ef1edf01b 441 * 4. The filter_method is 64 and
destinyXfate 2:0e2ef1edf01b 442 * 5. The color_type is RGB or RGBA
destinyXfate 2:0e2ef1edf01b 443 */
destinyXfate 2:0e2ef1edf01b 444 if (
destinyXfate 2:0e2ef1edf01b 445 #if defined(PNG_MNG_FEATURES_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 446 !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
destinyXfate 2:0e2ef1edf01b 447 ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
destinyXfate 2:0e2ef1edf01b 448 (color_type == PNG_COLOR_TYPE_RGB ||
destinyXfate 2:0e2ef1edf01b 449 color_type == PNG_COLOR_TYPE_RGB_ALPHA) &&
destinyXfate 2:0e2ef1edf01b 450 (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&
destinyXfate 2:0e2ef1edf01b 451 #endif
destinyXfate 2:0e2ef1edf01b 452 filter_type != PNG_FILTER_TYPE_BASE)
destinyXfate 2:0e2ef1edf01b 453 {
destinyXfate 2:0e2ef1edf01b 454 png_warning(png_ptr, "Invalid filter type specified");
destinyXfate 2:0e2ef1edf01b 455 filter_type = PNG_FILTER_TYPE_BASE;
destinyXfate 2:0e2ef1edf01b 456 }
destinyXfate 2:0e2ef1edf01b 457
destinyXfate 2:0e2ef1edf01b 458 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
destinyXfate 2:0e2ef1edf01b 459 if (interlace_type != PNG_INTERLACE_NONE &&
destinyXfate 2:0e2ef1edf01b 460 interlace_type != PNG_INTERLACE_ADAM7)
destinyXfate 2:0e2ef1edf01b 461 {
destinyXfate 2:0e2ef1edf01b 462 png_warning(png_ptr, "Invalid interlace type specified");
destinyXfate 2:0e2ef1edf01b 463 interlace_type = PNG_INTERLACE_ADAM7;
destinyXfate 2:0e2ef1edf01b 464 }
destinyXfate 2:0e2ef1edf01b 465 #else
destinyXfate 2:0e2ef1edf01b 466 interlace_type=PNG_INTERLACE_NONE;
destinyXfate 2:0e2ef1edf01b 467 #endif
destinyXfate 2:0e2ef1edf01b 468
destinyXfate 2:0e2ef1edf01b 469 /* save off the relevent information */
destinyXfate 2:0e2ef1edf01b 470 png_ptr->bit_depth = (png_byte)bit_depth;
destinyXfate 2:0e2ef1edf01b 471 png_ptr->color_type = (png_byte)color_type;
destinyXfate 2:0e2ef1edf01b 472 png_ptr->interlaced = (png_byte)interlace_type;
destinyXfate 2:0e2ef1edf01b 473 #if defined(PNG_MNG_FEATURES_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 474 png_ptr->filter_type = (png_byte)filter_type;
destinyXfate 2:0e2ef1edf01b 475 #endif
destinyXfate 2:0e2ef1edf01b 476 png_ptr->compression_type = (png_byte)compression_type;
destinyXfate 2:0e2ef1edf01b 477 png_ptr->width = width;
destinyXfate 2:0e2ef1edf01b 478 png_ptr->height = height;
destinyXfate 2:0e2ef1edf01b 479
destinyXfate 2:0e2ef1edf01b 480 png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels);
destinyXfate 2:0e2ef1edf01b 481 png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);
destinyXfate 2:0e2ef1edf01b 482 /* set the usr info, so any transformations can modify it */
destinyXfate 2:0e2ef1edf01b 483 png_ptr->usr_width = png_ptr->width;
destinyXfate 2:0e2ef1edf01b 484 png_ptr->usr_bit_depth = png_ptr->bit_depth;
destinyXfate 2:0e2ef1edf01b 485 png_ptr->usr_channels = png_ptr->channels;
destinyXfate 2:0e2ef1edf01b 486
destinyXfate 2:0e2ef1edf01b 487 /* pack the header information into the buffer */
destinyXfate 2:0e2ef1edf01b 488 png_save_uint_32(buf, width);
destinyXfate 2:0e2ef1edf01b 489 png_save_uint_32(buf + 4, height);
destinyXfate 2:0e2ef1edf01b 490 buf[8] = (png_byte)bit_depth;
destinyXfate 2:0e2ef1edf01b 491 buf[9] = (png_byte)color_type;
destinyXfate 2:0e2ef1edf01b 492 buf[10] = (png_byte)compression_type;
destinyXfate 2:0e2ef1edf01b 493 buf[11] = (png_byte)filter_type;
destinyXfate 2:0e2ef1edf01b 494 buf[12] = (png_byte)interlace_type;
destinyXfate 2:0e2ef1edf01b 495
destinyXfate 2:0e2ef1edf01b 496 /* write the chunk */
destinyXfate 2:0e2ef1edf01b 497 png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
destinyXfate 2:0e2ef1edf01b 498
destinyXfate 2:0e2ef1edf01b 499 /* initialize zlib with PNG info */
destinyXfate 2:0e2ef1edf01b 500 png_ptr->zstream.zalloc = png_zalloc;
destinyXfate 2:0e2ef1edf01b 501 png_ptr->zstream.zfree = png_zfree;
destinyXfate 2:0e2ef1edf01b 502 png_ptr->zstream.opaque = (voidpf)png_ptr;
destinyXfate 2:0e2ef1edf01b 503 if (!(png_ptr->do_filter))
destinyXfate 2:0e2ef1edf01b 504 {
destinyXfate 2:0e2ef1edf01b 505 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
destinyXfate 2:0e2ef1edf01b 506 png_ptr->bit_depth < 8)
destinyXfate 2:0e2ef1edf01b 507 png_ptr->do_filter = PNG_FILTER_NONE;
destinyXfate 2:0e2ef1edf01b 508 else
destinyXfate 2:0e2ef1edf01b 509 png_ptr->do_filter = PNG_ALL_FILTERS;
destinyXfate 2:0e2ef1edf01b 510 }
destinyXfate 2:0e2ef1edf01b 511 if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY))
destinyXfate 2:0e2ef1edf01b 512 {
destinyXfate 2:0e2ef1edf01b 513 if (png_ptr->do_filter != PNG_FILTER_NONE)
destinyXfate 2:0e2ef1edf01b 514 png_ptr->zlib_strategy = Z_FILTERED;
destinyXfate 2:0e2ef1edf01b 515 else
destinyXfate 2:0e2ef1edf01b 516 png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY;
destinyXfate 2:0e2ef1edf01b 517 }
destinyXfate 2:0e2ef1edf01b 518 if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL))
destinyXfate 2:0e2ef1edf01b 519 png_ptr->zlib_level = Z_DEFAULT_COMPRESSION;
destinyXfate 2:0e2ef1edf01b 520 if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL))
destinyXfate 2:0e2ef1edf01b 521 png_ptr->zlib_mem_level = 8;
destinyXfate 2:0e2ef1edf01b 522 if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS))
destinyXfate 2:0e2ef1edf01b 523 png_ptr->zlib_window_bits = 15;
destinyXfate 2:0e2ef1edf01b 524 if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD))
destinyXfate 2:0e2ef1edf01b 525 png_ptr->zlib_method = 8;
destinyXfate 2:0e2ef1edf01b 526 deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
destinyXfate 2:0e2ef1edf01b 527 png_ptr->zlib_method, png_ptr->zlib_window_bits,
destinyXfate 2:0e2ef1edf01b 528 png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
destinyXfate 2:0e2ef1edf01b 529 png_ptr->zstream.next_out = png_ptr->zbuf;
destinyXfate 2:0e2ef1edf01b 530 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
destinyXfate 2:0e2ef1edf01b 531 /* libpng is not interested in zstream.data_type */
destinyXfate 2:0e2ef1edf01b 532 /* set it to a predefined value, to avoid its evaluation inside zlib */
destinyXfate 2:0e2ef1edf01b 533 png_ptr->zstream.data_type = Z_BINARY;
destinyXfate 2:0e2ef1edf01b 534
destinyXfate 2:0e2ef1edf01b 535 png_ptr->mode = PNG_HAVE_IHDR;
destinyXfate 2:0e2ef1edf01b 536 }
destinyXfate 2:0e2ef1edf01b 537
destinyXfate 2:0e2ef1edf01b 538 /* write the palette. We are careful not to trust png_color to be in the
destinyXfate 2:0e2ef1edf01b 539 * correct order for PNG, so people can redefine it to any convenient
destinyXfate 2:0e2ef1edf01b 540 * structure.
destinyXfate 2:0e2ef1edf01b 541 */
destinyXfate 2:0e2ef1edf01b 542 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 543 png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
destinyXfate 2:0e2ef1edf01b 544 {
destinyXfate 2:0e2ef1edf01b 545 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 546 PNG_PLTE;
destinyXfate 2:0e2ef1edf01b 547 #endif
destinyXfate 2:0e2ef1edf01b 548 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 549 png_colorp pal_ptr;
destinyXfate 2:0e2ef1edf01b 550 png_byte buf[3];
destinyXfate 2:0e2ef1edf01b 551
destinyXfate 2:0e2ef1edf01b 552 png_debug(1, "in png_write_PLTE\n");
destinyXfate 2:0e2ef1edf01b 553 if ((
destinyXfate 2:0e2ef1edf01b 554 #if defined(PNG_MNG_FEATURES_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 555 !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&
destinyXfate 2:0e2ef1edf01b 556 #endif
destinyXfate 2:0e2ef1edf01b 557 num_pal == 0) || num_pal > 256)
destinyXfate 2:0e2ef1edf01b 558 {
destinyXfate 2:0e2ef1edf01b 559 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
destinyXfate 2:0e2ef1edf01b 560 {
destinyXfate 2:0e2ef1edf01b 561 png_error(png_ptr, "Invalid number of colors in palette");
destinyXfate 2:0e2ef1edf01b 562 }
destinyXfate 2:0e2ef1edf01b 563 else
destinyXfate 2:0e2ef1edf01b 564 {
destinyXfate 2:0e2ef1edf01b 565 png_warning(png_ptr, "Invalid number of colors in palette");
destinyXfate 2:0e2ef1edf01b 566 return;
destinyXfate 2:0e2ef1edf01b 567 }
destinyXfate 2:0e2ef1edf01b 568 }
destinyXfate 2:0e2ef1edf01b 569
destinyXfate 2:0e2ef1edf01b 570 if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
destinyXfate 2:0e2ef1edf01b 571 {
destinyXfate 2:0e2ef1edf01b 572 png_warning(png_ptr,
destinyXfate 2:0e2ef1edf01b 573 "Ignoring request to write a PLTE chunk in grayscale PNG");
destinyXfate 2:0e2ef1edf01b 574 return;
destinyXfate 2:0e2ef1edf01b 575 }
destinyXfate 2:0e2ef1edf01b 576
destinyXfate 2:0e2ef1edf01b 577 png_ptr->num_palette = (png_uint_16)num_pal;
destinyXfate 2:0e2ef1edf01b 578 png_debug1(3, "num_palette = %d\n", png_ptr->num_palette);
destinyXfate 2:0e2ef1edf01b 579
destinyXfate 2:0e2ef1edf01b 580 png_write_chunk_start(png_ptr, (png_bytep)png_PLTE, num_pal * 3);
destinyXfate 2:0e2ef1edf01b 581 #ifndef PNG_NO_POINTER_INDEXING
destinyXfate 2:0e2ef1edf01b 582 for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
destinyXfate 2:0e2ef1edf01b 583 {
destinyXfate 2:0e2ef1edf01b 584 buf[0] = pal_ptr->red;
destinyXfate 2:0e2ef1edf01b 585 buf[1] = pal_ptr->green;
destinyXfate 2:0e2ef1edf01b 586 buf[2] = pal_ptr->blue;
destinyXfate 2:0e2ef1edf01b 587 png_write_chunk_data(png_ptr, buf, (png_size_t)3);
destinyXfate 2:0e2ef1edf01b 588 }
destinyXfate 2:0e2ef1edf01b 589 #else
destinyXfate 2:0e2ef1edf01b 590 /* This is a little slower but some buggy compilers need to do this instead */
destinyXfate 2:0e2ef1edf01b 591 pal_ptr=palette;
destinyXfate 2:0e2ef1edf01b 592 for (i = 0; i < num_pal; i++)
destinyXfate 2:0e2ef1edf01b 593 {
destinyXfate 2:0e2ef1edf01b 594 buf[0] = pal_ptr[i].red;
destinyXfate 2:0e2ef1edf01b 595 buf[1] = pal_ptr[i].green;
destinyXfate 2:0e2ef1edf01b 596 buf[2] = pal_ptr[i].blue;
destinyXfate 2:0e2ef1edf01b 597 png_write_chunk_data(png_ptr, buf, (png_size_t)3);
destinyXfate 2:0e2ef1edf01b 598 }
destinyXfate 2:0e2ef1edf01b 599 #endif
destinyXfate 2:0e2ef1edf01b 600 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 601 png_ptr->mode |= PNG_HAVE_PLTE;
destinyXfate 2:0e2ef1edf01b 602 }
destinyXfate 2:0e2ef1edf01b 603
destinyXfate 2:0e2ef1edf01b 604 /* write an IDAT chunk */
destinyXfate 2:0e2ef1edf01b 605 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 606 png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
destinyXfate 2:0e2ef1edf01b 607 {
destinyXfate 2:0e2ef1edf01b 608 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 609 PNG_IDAT;
destinyXfate 2:0e2ef1edf01b 610 #endif
destinyXfate 2:0e2ef1edf01b 611 png_debug(1, "in png_write_IDAT\n");
destinyXfate 2:0e2ef1edf01b 612
destinyXfate 2:0e2ef1edf01b 613 /* Optimize the CMF field in the zlib stream. */
destinyXfate 2:0e2ef1edf01b 614 /* This hack of the zlib stream is compliant to the stream specification. */
destinyXfate 2:0e2ef1edf01b 615 if (!(png_ptr->mode & PNG_HAVE_IDAT) &&
destinyXfate 2:0e2ef1edf01b 616 png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE)
destinyXfate 2:0e2ef1edf01b 617 {
destinyXfate 2:0e2ef1edf01b 618 unsigned int z_cmf = data[0]; /* zlib compression method and flags */
destinyXfate 2:0e2ef1edf01b 619 if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
destinyXfate 2:0e2ef1edf01b 620 {
destinyXfate 2:0e2ef1edf01b 621 /* Avoid memory underflows and multiplication overflows. */
destinyXfate 2:0e2ef1edf01b 622 /* The conditions below are practically always satisfied;
destinyXfate 2:0e2ef1edf01b 623 however, they still must be checked. */
destinyXfate 2:0e2ef1edf01b 624 if (length >= 2 &&
destinyXfate 2:0e2ef1edf01b 625 png_ptr->height < 16384 && png_ptr->width < 16384)
destinyXfate 2:0e2ef1edf01b 626 {
destinyXfate 2:0e2ef1edf01b 627 png_uint_32 uncompressed_idat_size = png_ptr->height *
destinyXfate 2:0e2ef1edf01b 628 ((png_ptr->width *
destinyXfate 2:0e2ef1edf01b 629 png_ptr->channels * png_ptr->bit_depth + 15) >> 3);
destinyXfate 2:0e2ef1edf01b 630 unsigned int z_cinfo = z_cmf >> 4;
destinyXfate 2:0e2ef1edf01b 631 unsigned int half_z_window_size = 1 << (z_cinfo + 7);
destinyXfate 2:0e2ef1edf01b 632 while (uncompressed_idat_size <= half_z_window_size &&
destinyXfate 2:0e2ef1edf01b 633 half_z_window_size >= 256)
destinyXfate 2:0e2ef1edf01b 634 {
destinyXfate 2:0e2ef1edf01b 635 z_cinfo--;
destinyXfate 2:0e2ef1edf01b 636 half_z_window_size >>= 1;
destinyXfate 2:0e2ef1edf01b 637 }
destinyXfate 2:0e2ef1edf01b 638 z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4);
destinyXfate 2:0e2ef1edf01b 639 if (data[0] != (png_byte)z_cmf)
destinyXfate 2:0e2ef1edf01b 640 {
destinyXfate 2:0e2ef1edf01b 641 data[0] = (png_byte)z_cmf;
destinyXfate 2:0e2ef1edf01b 642 data[1] &= 0xe0;
destinyXfate 2:0e2ef1edf01b 643 data[1] += (png_byte)(0x1f - ((z_cmf << 8) + data[1]) % 0x1f);
destinyXfate 2:0e2ef1edf01b 644 }
destinyXfate 2:0e2ef1edf01b 645 }
destinyXfate 2:0e2ef1edf01b 646 }
destinyXfate 2:0e2ef1edf01b 647 else
destinyXfate 2:0e2ef1edf01b 648 png_error(png_ptr,
destinyXfate 2:0e2ef1edf01b 649 "Invalid zlib compression method or flags in IDAT");
destinyXfate 2:0e2ef1edf01b 650 }
destinyXfate 2:0e2ef1edf01b 651
destinyXfate 2:0e2ef1edf01b 652 png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length);
destinyXfate 2:0e2ef1edf01b 653 png_ptr->mode |= PNG_HAVE_IDAT;
destinyXfate 2:0e2ef1edf01b 654 }
destinyXfate 2:0e2ef1edf01b 655
destinyXfate 2:0e2ef1edf01b 656 /* write an IEND chunk */
destinyXfate 2:0e2ef1edf01b 657 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 658 png_write_IEND(png_structp png_ptr)
destinyXfate 2:0e2ef1edf01b 659 {
destinyXfate 2:0e2ef1edf01b 660 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 661 PNG_IEND;
destinyXfate 2:0e2ef1edf01b 662 #endif
destinyXfate 2:0e2ef1edf01b 663 png_debug(1, "in png_write_IEND\n");
destinyXfate 2:0e2ef1edf01b 664 png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
destinyXfate 2:0e2ef1edf01b 665 (png_size_t)0);
destinyXfate 2:0e2ef1edf01b 666 png_ptr->mode |= PNG_HAVE_IEND;
destinyXfate 2:0e2ef1edf01b 667 }
destinyXfate 2:0e2ef1edf01b 668
destinyXfate 2:0e2ef1edf01b 669 #if defined(PNG_WRITE_gAMA_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 670 /* write a gAMA chunk */
destinyXfate 2:0e2ef1edf01b 671 #ifdef PNG_FLOATING_POINT_SUPPORTED
destinyXfate 2:0e2ef1edf01b 672 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 673 png_write_gAMA(png_structp png_ptr, double file_gamma)
destinyXfate 2:0e2ef1edf01b 674 {
destinyXfate 2:0e2ef1edf01b 675 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 676 PNG_gAMA;
destinyXfate 2:0e2ef1edf01b 677 #endif
destinyXfate 2:0e2ef1edf01b 678 png_uint_32 igamma;
destinyXfate 2:0e2ef1edf01b 679 png_byte buf[4];
destinyXfate 2:0e2ef1edf01b 680
destinyXfate 2:0e2ef1edf01b 681 png_debug(1, "in png_write_gAMA\n");
destinyXfate 2:0e2ef1edf01b 682 /* file_gamma is saved in 1/100,000ths */
destinyXfate 2:0e2ef1edf01b 683 igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 684 png_save_uint_32(buf, igamma);
destinyXfate 2:0e2ef1edf01b 685 png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
destinyXfate 2:0e2ef1edf01b 686 }
destinyXfate 2:0e2ef1edf01b 687 #endif
destinyXfate 2:0e2ef1edf01b 688 #ifdef PNG_FIXED_POINT_SUPPORTED
destinyXfate 2:0e2ef1edf01b 689 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 690 png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
destinyXfate 2:0e2ef1edf01b 691 {
destinyXfate 2:0e2ef1edf01b 692 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 693 PNG_gAMA;
destinyXfate 2:0e2ef1edf01b 694 #endif
destinyXfate 2:0e2ef1edf01b 695 png_byte buf[4];
destinyXfate 2:0e2ef1edf01b 696
destinyXfate 2:0e2ef1edf01b 697 png_debug(1, "in png_write_gAMA\n");
destinyXfate 2:0e2ef1edf01b 698 /* file_gamma is saved in 1/100,000ths */
destinyXfate 2:0e2ef1edf01b 699 png_save_uint_32(buf, (png_uint_32)file_gamma);
destinyXfate 2:0e2ef1edf01b 700 png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
destinyXfate 2:0e2ef1edf01b 701 }
destinyXfate 2:0e2ef1edf01b 702 #endif
destinyXfate 2:0e2ef1edf01b 703 #endif
destinyXfate 2:0e2ef1edf01b 704
destinyXfate 2:0e2ef1edf01b 705 #if defined(PNG_WRITE_sRGB_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 706 /* write a sRGB chunk */
destinyXfate 2:0e2ef1edf01b 707 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 708 png_write_sRGB(png_structp png_ptr, int srgb_intent)
destinyXfate 2:0e2ef1edf01b 709 {
destinyXfate 2:0e2ef1edf01b 710 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 711 PNG_sRGB;
destinyXfate 2:0e2ef1edf01b 712 #endif
destinyXfate 2:0e2ef1edf01b 713 png_byte buf[1];
destinyXfate 2:0e2ef1edf01b 714
destinyXfate 2:0e2ef1edf01b 715 png_debug(1, "in png_write_sRGB\n");
destinyXfate 2:0e2ef1edf01b 716 if(srgb_intent >= PNG_sRGB_INTENT_LAST)
destinyXfate 2:0e2ef1edf01b 717 png_warning(png_ptr,
destinyXfate 2:0e2ef1edf01b 718 "Invalid sRGB rendering intent specified");
destinyXfate 2:0e2ef1edf01b 719 buf[0]=(png_byte)srgb_intent;
destinyXfate 2:0e2ef1edf01b 720 png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1);
destinyXfate 2:0e2ef1edf01b 721 }
destinyXfate 2:0e2ef1edf01b 722 #endif
destinyXfate 2:0e2ef1edf01b 723
destinyXfate 2:0e2ef1edf01b 724 #if defined(PNG_WRITE_iCCP_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 725 /* write an iCCP chunk */
destinyXfate 2:0e2ef1edf01b 726 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 727 png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
destinyXfate 2:0e2ef1edf01b 728 png_charp profile, int profile_len)
destinyXfate 2:0e2ef1edf01b 729 {
destinyXfate 2:0e2ef1edf01b 730 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 731 PNG_iCCP;
destinyXfate 2:0e2ef1edf01b 732 #endif
destinyXfate 2:0e2ef1edf01b 733 png_size_t name_len;
destinyXfate 2:0e2ef1edf01b 734 png_charp new_name;
destinyXfate 2:0e2ef1edf01b 735 compression_state comp;
destinyXfate 2:0e2ef1edf01b 736 int embedded_profile_len = 0;
destinyXfate 2:0e2ef1edf01b 737
destinyXfate 2:0e2ef1edf01b 738 png_debug(1, "in png_write_iCCP\n");
destinyXfate 2:0e2ef1edf01b 739
destinyXfate 2:0e2ef1edf01b 740 comp.num_output_ptr = 0;
destinyXfate 2:0e2ef1edf01b 741 comp.max_output_ptr = 0;
destinyXfate 2:0e2ef1edf01b 742 comp.output_ptr = NULL;
destinyXfate 2:0e2ef1edf01b 743 comp.input = NULL;
destinyXfate 2:0e2ef1edf01b 744 comp.input_len = 0;
destinyXfate 2:0e2ef1edf01b 745
destinyXfate 2:0e2ef1edf01b 746 if (name == NULL || (name_len = png_check_keyword(png_ptr, name,
destinyXfate 2:0e2ef1edf01b 747 &new_name)) == 0)
destinyXfate 2:0e2ef1edf01b 748 {
destinyXfate 2:0e2ef1edf01b 749 png_warning(png_ptr, "Empty keyword in iCCP chunk");
destinyXfate 2:0e2ef1edf01b 750 return;
destinyXfate 2:0e2ef1edf01b 751 }
destinyXfate 2:0e2ef1edf01b 752
destinyXfate 2:0e2ef1edf01b 753 if (compression_type != PNG_COMPRESSION_TYPE_BASE)
destinyXfate 2:0e2ef1edf01b 754 png_warning(png_ptr, "Unknown compression type in iCCP chunk");
destinyXfate 2:0e2ef1edf01b 755
destinyXfate 2:0e2ef1edf01b 756 if (profile == NULL)
destinyXfate 2:0e2ef1edf01b 757 profile_len = 0;
destinyXfate 2:0e2ef1edf01b 758
destinyXfate 2:0e2ef1edf01b 759 if (profile_len > 3)
destinyXfate 2:0e2ef1edf01b 760 embedded_profile_len =
destinyXfate 2:0e2ef1edf01b 761 ((*( (png_bytep)profile ))<<24) |
destinyXfate 2:0e2ef1edf01b 762 ((*( (png_bytep)profile+1))<<16) |
destinyXfate 2:0e2ef1edf01b 763 ((*( (png_bytep)profile+2))<< 8) |
destinyXfate 2:0e2ef1edf01b 764 ((*( (png_bytep)profile+3)) );
destinyXfate 2:0e2ef1edf01b 765
destinyXfate 2:0e2ef1edf01b 766 if (profile_len < embedded_profile_len)
destinyXfate 2:0e2ef1edf01b 767 {
destinyXfate 2:0e2ef1edf01b 768 png_warning(png_ptr,
destinyXfate 2:0e2ef1edf01b 769 "Embedded profile length too large in iCCP chunk");
destinyXfate 2:0e2ef1edf01b 770 return;
destinyXfate 2:0e2ef1edf01b 771 }
destinyXfate 2:0e2ef1edf01b 772
destinyXfate 2:0e2ef1edf01b 773 if (profile_len > embedded_profile_len)
destinyXfate 2:0e2ef1edf01b 774 {
destinyXfate 2:0e2ef1edf01b 775 png_warning(png_ptr,
destinyXfate 2:0e2ef1edf01b 776 "Truncating profile to actual length in iCCP chunk");
destinyXfate 2:0e2ef1edf01b 777 profile_len = embedded_profile_len;
destinyXfate 2:0e2ef1edf01b 778 }
destinyXfate 2:0e2ef1edf01b 779
destinyXfate 2:0e2ef1edf01b 780 if (profile_len)
destinyXfate 2:0e2ef1edf01b 781 profile_len = png_text_compress(png_ptr, profile, (png_size_t)profile_len,
destinyXfate 2:0e2ef1edf01b 782 PNG_COMPRESSION_TYPE_BASE, &comp);
destinyXfate 2:0e2ef1edf01b 783
destinyXfate 2:0e2ef1edf01b 784 /* make sure we include the NULL after the name and the compression type */
destinyXfate 2:0e2ef1edf01b 785 png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
destinyXfate 2:0e2ef1edf01b 786 (png_uint_32)name_len+profile_len+2);
destinyXfate 2:0e2ef1edf01b 787 new_name[name_len+1]=0x00;
destinyXfate 2:0e2ef1edf01b 788 png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 2);
destinyXfate 2:0e2ef1edf01b 789
destinyXfate 2:0e2ef1edf01b 790 if (profile_len)
destinyXfate 2:0e2ef1edf01b 791 png_write_compressed_data_out(png_ptr, &comp);
destinyXfate 2:0e2ef1edf01b 792
destinyXfate 2:0e2ef1edf01b 793 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 794 png_free(png_ptr, new_name);
destinyXfate 2:0e2ef1edf01b 795 }
destinyXfate 2:0e2ef1edf01b 796 #endif
destinyXfate 2:0e2ef1edf01b 797
destinyXfate 2:0e2ef1edf01b 798 #if defined(PNG_WRITE_sPLT_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 799 /* write a sPLT chunk */
destinyXfate 2:0e2ef1edf01b 800 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 801 png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
destinyXfate 2:0e2ef1edf01b 802 {
destinyXfate 2:0e2ef1edf01b 803 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 804 PNG_sPLT;
destinyXfate 2:0e2ef1edf01b 805 #endif
destinyXfate 2:0e2ef1edf01b 806 png_size_t name_len;
destinyXfate 2:0e2ef1edf01b 807 png_charp new_name;
destinyXfate 2:0e2ef1edf01b 808 png_byte entrybuf[10];
destinyXfate 2:0e2ef1edf01b 809 int entry_size = (spalette->depth == 8 ? 6 : 10);
destinyXfate 2:0e2ef1edf01b 810 int palette_size = entry_size * spalette->nentries;
destinyXfate 2:0e2ef1edf01b 811 png_sPLT_entryp ep;
destinyXfate 2:0e2ef1edf01b 812 #ifdef PNG_NO_POINTER_INDEXING
destinyXfate 2:0e2ef1edf01b 813 int i;
destinyXfate 2:0e2ef1edf01b 814 #endif
destinyXfate 2:0e2ef1edf01b 815
destinyXfate 2:0e2ef1edf01b 816 png_debug(1, "in png_write_sPLT\n");
destinyXfate 2:0e2ef1edf01b 817 if (spalette->name == NULL || (name_len = png_check_keyword(png_ptr,
destinyXfate 2:0e2ef1edf01b 818 spalette->name, &new_name))==0)
destinyXfate 2:0e2ef1edf01b 819 {
destinyXfate 2:0e2ef1edf01b 820 png_warning(png_ptr, "Empty keyword in sPLT chunk");
destinyXfate 2:0e2ef1edf01b 821 return;
destinyXfate 2:0e2ef1edf01b 822 }
destinyXfate 2:0e2ef1edf01b 823
destinyXfate 2:0e2ef1edf01b 824 /* make sure we include the NULL after the name */
destinyXfate 2:0e2ef1edf01b 825 png_write_chunk_start(png_ptr, (png_bytep)png_sPLT,
destinyXfate 2:0e2ef1edf01b 826 (png_uint_32)(name_len + 2 + palette_size));
destinyXfate 2:0e2ef1edf01b 827 png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1);
destinyXfate 2:0e2ef1edf01b 828 png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, 1);
destinyXfate 2:0e2ef1edf01b 829
destinyXfate 2:0e2ef1edf01b 830 /* loop through each palette entry, writing appropriately */
destinyXfate 2:0e2ef1edf01b 831 #ifndef PNG_NO_POINTER_INDEXING
destinyXfate 2:0e2ef1edf01b 832 for (ep = spalette->entries; ep<spalette->entries+spalette->nentries; ep++)
destinyXfate 2:0e2ef1edf01b 833 {
destinyXfate 2:0e2ef1edf01b 834 if (spalette->depth == 8)
destinyXfate 2:0e2ef1edf01b 835 {
destinyXfate 2:0e2ef1edf01b 836 entrybuf[0] = (png_byte)ep->red;
destinyXfate 2:0e2ef1edf01b 837 entrybuf[1] = (png_byte)ep->green;
destinyXfate 2:0e2ef1edf01b 838 entrybuf[2] = (png_byte)ep->blue;
destinyXfate 2:0e2ef1edf01b 839 entrybuf[3] = (png_byte)ep->alpha;
destinyXfate 2:0e2ef1edf01b 840 png_save_uint_16(entrybuf + 4, ep->frequency);
destinyXfate 2:0e2ef1edf01b 841 }
destinyXfate 2:0e2ef1edf01b 842 else
destinyXfate 2:0e2ef1edf01b 843 {
destinyXfate 2:0e2ef1edf01b 844 png_save_uint_16(entrybuf + 0, ep->red);
destinyXfate 2:0e2ef1edf01b 845 png_save_uint_16(entrybuf + 2, ep->green);
destinyXfate 2:0e2ef1edf01b 846 png_save_uint_16(entrybuf + 4, ep->blue);
destinyXfate 2:0e2ef1edf01b 847 png_save_uint_16(entrybuf + 6, ep->alpha);
destinyXfate 2:0e2ef1edf01b 848 png_save_uint_16(entrybuf + 8, ep->frequency);
destinyXfate 2:0e2ef1edf01b 849 }
destinyXfate 2:0e2ef1edf01b 850 png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);
destinyXfate 2:0e2ef1edf01b 851 }
destinyXfate 2:0e2ef1edf01b 852 #else
destinyXfate 2:0e2ef1edf01b 853 ep=spalette->entries;
destinyXfate 2:0e2ef1edf01b 854 for (i=0; i>spalette->nentries; i++)
destinyXfate 2:0e2ef1edf01b 855 {
destinyXfate 2:0e2ef1edf01b 856 if (spalette->depth == 8)
destinyXfate 2:0e2ef1edf01b 857 {
destinyXfate 2:0e2ef1edf01b 858 entrybuf[0] = (png_byte)ep[i].red;
destinyXfate 2:0e2ef1edf01b 859 entrybuf[1] = (png_byte)ep[i].green;
destinyXfate 2:0e2ef1edf01b 860 entrybuf[2] = (png_byte)ep[i].blue;
destinyXfate 2:0e2ef1edf01b 861 entrybuf[3] = (png_byte)ep[i].alpha;
destinyXfate 2:0e2ef1edf01b 862 png_save_uint_16(entrybuf + 4, ep[i].frequency);
destinyXfate 2:0e2ef1edf01b 863 }
destinyXfate 2:0e2ef1edf01b 864 else
destinyXfate 2:0e2ef1edf01b 865 {
destinyXfate 2:0e2ef1edf01b 866 png_save_uint_16(entrybuf + 0, ep[i].red);
destinyXfate 2:0e2ef1edf01b 867 png_save_uint_16(entrybuf + 2, ep[i].green);
destinyXfate 2:0e2ef1edf01b 868 png_save_uint_16(entrybuf + 4, ep[i].blue);
destinyXfate 2:0e2ef1edf01b 869 png_save_uint_16(entrybuf + 6, ep[i].alpha);
destinyXfate 2:0e2ef1edf01b 870 png_save_uint_16(entrybuf + 8, ep[i].frequency);
destinyXfate 2:0e2ef1edf01b 871 }
destinyXfate 2:0e2ef1edf01b 872 png_write_chunk_data(png_ptr, entrybuf, entry_size);
destinyXfate 2:0e2ef1edf01b 873 }
destinyXfate 2:0e2ef1edf01b 874 #endif
destinyXfate 2:0e2ef1edf01b 875
destinyXfate 2:0e2ef1edf01b 876 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 877 png_free(png_ptr, new_name);
destinyXfate 2:0e2ef1edf01b 878 }
destinyXfate 2:0e2ef1edf01b 879 #endif
destinyXfate 2:0e2ef1edf01b 880
destinyXfate 2:0e2ef1edf01b 881 #if defined(PNG_WRITE_sBIT_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 882 /* write the sBIT chunk */
destinyXfate 2:0e2ef1edf01b 883 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 884 png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
destinyXfate 2:0e2ef1edf01b 885 {
destinyXfate 2:0e2ef1edf01b 886 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 887 PNG_sBIT;
destinyXfate 2:0e2ef1edf01b 888 #endif
destinyXfate 2:0e2ef1edf01b 889 png_byte buf[4];
destinyXfate 2:0e2ef1edf01b 890 png_size_t size;
destinyXfate 2:0e2ef1edf01b 891
destinyXfate 2:0e2ef1edf01b 892 png_debug(1, "in png_write_sBIT\n");
destinyXfate 2:0e2ef1edf01b 893 /* make sure we don't depend upon the order of PNG_COLOR_8 */
destinyXfate 2:0e2ef1edf01b 894 if (color_type & PNG_COLOR_MASK_COLOR)
destinyXfate 2:0e2ef1edf01b 895 {
destinyXfate 2:0e2ef1edf01b 896 png_byte maxbits;
destinyXfate 2:0e2ef1edf01b 897
destinyXfate 2:0e2ef1edf01b 898 maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 :
destinyXfate 2:0e2ef1edf01b 899 png_ptr->usr_bit_depth);
destinyXfate 2:0e2ef1edf01b 900 if (sbit->red == 0 || sbit->red > maxbits ||
destinyXfate 2:0e2ef1edf01b 901 sbit->green == 0 || sbit->green > maxbits ||
destinyXfate 2:0e2ef1edf01b 902 sbit->blue == 0 || sbit->blue > maxbits)
destinyXfate 2:0e2ef1edf01b 903 {
destinyXfate 2:0e2ef1edf01b 904 png_warning(png_ptr, "Invalid sBIT depth specified");
destinyXfate 2:0e2ef1edf01b 905 return;
destinyXfate 2:0e2ef1edf01b 906 }
destinyXfate 2:0e2ef1edf01b 907 buf[0] = sbit->red;
destinyXfate 2:0e2ef1edf01b 908 buf[1] = sbit->green;
destinyXfate 2:0e2ef1edf01b 909 buf[2] = sbit->blue;
destinyXfate 2:0e2ef1edf01b 910 size = 3;
destinyXfate 2:0e2ef1edf01b 911 }
destinyXfate 2:0e2ef1edf01b 912 else
destinyXfate 2:0e2ef1edf01b 913 {
destinyXfate 2:0e2ef1edf01b 914 if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth)
destinyXfate 2:0e2ef1edf01b 915 {
destinyXfate 2:0e2ef1edf01b 916 png_warning(png_ptr, "Invalid sBIT depth specified");
destinyXfate 2:0e2ef1edf01b 917 return;
destinyXfate 2:0e2ef1edf01b 918 }
destinyXfate 2:0e2ef1edf01b 919 buf[0] = sbit->gray;
destinyXfate 2:0e2ef1edf01b 920 size = 1;
destinyXfate 2:0e2ef1edf01b 921 }
destinyXfate 2:0e2ef1edf01b 922
destinyXfate 2:0e2ef1edf01b 923 if (color_type & PNG_COLOR_MASK_ALPHA)
destinyXfate 2:0e2ef1edf01b 924 {
destinyXfate 2:0e2ef1edf01b 925 if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth)
destinyXfate 2:0e2ef1edf01b 926 {
destinyXfate 2:0e2ef1edf01b 927 png_warning(png_ptr, "Invalid sBIT depth specified");
destinyXfate 2:0e2ef1edf01b 928 return;
destinyXfate 2:0e2ef1edf01b 929 }
destinyXfate 2:0e2ef1edf01b 930 buf[size++] = sbit->alpha;
destinyXfate 2:0e2ef1edf01b 931 }
destinyXfate 2:0e2ef1edf01b 932
destinyXfate 2:0e2ef1edf01b 933 png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size);
destinyXfate 2:0e2ef1edf01b 934 }
destinyXfate 2:0e2ef1edf01b 935 #endif
destinyXfate 2:0e2ef1edf01b 936
destinyXfate 2:0e2ef1edf01b 937 #if defined(PNG_WRITE_cHRM_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 938 /* write the cHRM chunk */
destinyXfate 2:0e2ef1edf01b 939 #ifdef PNG_FLOATING_POINT_SUPPORTED
destinyXfate 2:0e2ef1edf01b 940 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 941 png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
destinyXfate 2:0e2ef1edf01b 942 double red_x, double red_y, double green_x, double green_y,
destinyXfate 2:0e2ef1edf01b 943 double blue_x, double blue_y)
destinyXfate 2:0e2ef1edf01b 944 {
destinyXfate 2:0e2ef1edf01b 945 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 946 PNG_cHRM;
destinyXfate 2:0e2ef1edf01b 947 #endif
destinyXfate 2:0e2ef1edf01b 948 png_byte buf[32];
destinyXfate 2:0e2ef1edf01b 949 png_uint_32 itemp;
destinyXfate 2:0e2ef1edf01b 950
destinyXfate 2:0e2ef1edf01b 951 png_debug(1, "in png_write_cHRM\n");
destinyXfate 2:0e2ef1edf01b 952 /* each value is saved in 1/100,000ths */
destinyXfate 2:0e2ef1edf01b 953 if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
destinyXfate 2:0e2ef1edf01b 954 white_x + white_y > 1.0)
destinyXfate 2:0e2ef1edf01b 955 {
destinyXfate 2:0e2ef1edf01b 956 png_warning(png_ptr, "Invalid cHRM white point specified");
destinyXfate 2:0e2ef1edf01b 957 #if !defined(PNG_NO_CONSOLE_IO)
destinyXfate 2:0e2ef1edf01b 958 fprintf(stderr,"white_x=%f, white_y=%f\n",white_x, white_y);
destinyXfate 2:0e2ef1edf01b 959 #endif
destinyXfate 2:0e2ef1edf01b 960 return;
destinyXfate 2:0e2ef1edf01b 961 }
destinyXfate 2:0e2ef1edf01b 962 itemp = (png_uint_32)(white_x * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 963 png_save_uint_32(buf, itemp);
destinyXfate 2:0e2ef1edf01b 964 itemp = (png_uint_32)(white_y * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 965 png_save_uint_32(buf + 4, itemp);
destinyXfate 2:0e2ef1edf01b 966
destinyXfate 2:0e2ef1edf01b 967 if (red_x < 0 || red_y < 0 || red_x + red_y > 1.0)
destinyXfate 2:0e2ef1edf01b 968 {
destinyXfate 2:0e2ef1edf01b 969 png_warning(png_ptr, "Invalid cHRM red point specified");
destinyXfate 2:0e2ef1edf01b 970 return;
destinyXfate 2:0e2ef1edf01b 971 }
destinyXfate 2:0e2ef1edf01b 972 itemp = (png_uint_32)(red_x * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 973 png_save_uint_32(buf + 8, itemp);
destinyXfate 2:0e2ef1edf01b 974 itemp = (png_uint_32)(red_y * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 975 png_save_uint_32(buf + 12, itemp);
destinyXfate 2:0e2ef1edf01b 976
destinyXfate 2:0e2ef1edf01b 977 if (green_x < 0 || green_y < 0 || green_x + green_y > 1.0)
destinyXfate 2:0e2ef1edf01b 978 {
destinyXfate 2:0e2ef1edf01b 979 png_warning(png_ptr, "Invalid cHRM green point specified");
destinyXfate 2:0e2ef1edf01b 980 return;
destinyXfate 2:0e2ef1edf01b 981 }
destinyXfate 2:0e2ef1edf01b 982 itemp = (png_uint_32)(green_x * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 983 png_save_uint_32(buf + 16, itemp);
destinyXfate 2:0e2ef1edf01b 984 itemp = (png_uint_32)(green_y * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 985 png_save_uint_32(buf + 20, itemp);
destinyXfate 2:0e2ef1edf01b 986
destinyXfate 2:0e2ef1edf01b 987 if (blue_x < 0 || blue_y < 0 || blue_x + blue_y > 1.0)
destinyXfate 2:0e2ef1edf01b 988 {
destinyXfate 2:0e2ef1edf01b 989 png_warning(png_ptr, "Invalid cHRM blue point specified");
destinyXfate 2:0e2ef1edf01b 990 return;
destinyXfate 2:0e2ef1edf01b 991 }
destinyXfate 2:0e2ef1edf01b 992 itemp = (png_uint_32)(blue_x * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 993 png_save_uint_32(buf + 24, itemp);
destinyXfate 2:0e2ef1edf01b 994 itemp = (png_uint_32)(blue_y * 100000.0 + 0.5);
destinyXfate 2:0e2ef1edf01b 995 png_save_uint_32(buf + 28, itemp);
destinyXfate 2:0e2ef1edf01b 996
destinyXfate 2:0e2ef1edf01b 997 png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
destinyXfate 2:0e2ef1edf01b 998 }
destinyXfate 2:0e2ef1edf01b 999 #endif
destinyXfate 2:0e2ef1edf01b 1000 #ifdef PNG_FIXED_POINT_SUPPORTED
destinyXfate 2:0e2ef1edf01b 1001 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1002 png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
destinyXfate 2:0e2ef1edf01b 1003 png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y,
destinyXfate 2:0e2ef1edf01b 1004 png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,
destinyXfate 2:0e2ef1edf01b 1005 png_fixed_point blue_y)
destinyXfate 2:0e2ef1edf01b 1006 {
destinyXfate 2:0e2ef1edf01b 1007 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1008 PNG_cHRM;
destinyXfate 2:0e2ef1edf01b 1009 #endif
destinyXfate 2:0e2ef1edf01b 1010 png_byte buf[32];
destinyXfate 2:0e2ef1edf01b 1011
destinyXfate 2:0e2ef1edf01b 1012 png_debug(1, "in png_write_cHRM\n");
destinyXfate 2:0e2ef1edf01b 1013 /* each value is saved in 1/100,000ths */
destinyXfate 2:0e2ef1edf01b 1014 if (white_x > 80000L || white_y > 80000L || white_x + white_y > 100000L)
destinyXfate 2:0e2ef1edf01b 1015 {
destinyXfate 2:0e2ef1edf01b 1016 png_warning(png_ptr, "Invalid fixed cHRM white point specified");
destinyXfate 2:0e2ef1edf01b 1017 #if !defined(PNG_NO_CONSOLE_IO)
destinyXfate 2:0e2ef1edf01b 1018 fprintf(stderr,"white_x=%ld, white_y=%ld\n",white_x, white_y);
destinyXfate 2:0e2ef1edf01b 1019 #endif
destinyXfate 2:0e2ef1edf01b 1020 return;
destinyXfate 2:0e2ef1edf01b 1021 }
destinyXfate 2:0e2ef1edf01b 1022 png_save_uint_32(buf, (png_uint_32)white_x);
destinyXfate 2:0e2ef1edf01b 1023 png_save_uint_32(buf + 4, (png_uint_32)white_y);
destinyXfate 2:0e2ef1edf01b 1024
destinyXfate 2:0e2ef1edf01b 1025 if (red_x + red_y > 100000L)
destinyXfate 2:0e2ef1edf01b 1026 {
destinyXfate 2:0e2ef1edf01b 1027 png_warning(png_ptr, "Invalid cHRM fixed red point specified");
destinyXfate 2:0e2ef1edf01b 1028 return;
destinyXfate 2:0e2ef1edf01b 1029 }
destinyXfate 2:0e2ef1edf01b 1030 png_save_uint_32(buf + 8, (png_uint_32)red_x);
destinyXfate 2:0e2ef1edf01b 1031 png_save_uint_32(buf + 12, (png_uint_32)red_y);
destinyXfate 2:0e2ef1edf01b 1032
destinyXfate 2:0e2ef1edf01b 1033 if (green_x + green_y > 100000L)
destinyXfate 2:0e2ef1edf01b 1034 {
destinyXfate 2:0e2ef1edf01b 1035 png_warning(png_ptr, "Invalid fixed cHRM green point specified");
destinyXfate 2:0e2ef1edf01b 1036 return;
destinyXfate 2:0e2ef1edf01b 1037 }
destinyXfate 2:0e2ef1edf01b 1038 png_save_uint_32(buf + 16, (png_uint_32)green_x);
destinyXfate 2:0e2ef1edf01b 1039 png_save_uint_32(buf + 20, (png_uint_32)green_y);
destinyXfate 2:0e2ef1edf01b 1040
destinyXfate 2:0e2ef1edf01b 1041 if (blue_x + blue_y > 100000L)
destinyXfate 2:0e2ef1edf01b 1042 {
destinyXfate 2:0e2ef1edf01b 1043 png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
destinyXfate 2:0e2ef1edf01b 1044 return;
destinyXfate 2:0e2ef1edf01b 1045 }
destinyXfate 2:0e2ef1edf01b 1046 png_save_uint_32(buf + 24, (png_uint_32)blue_x);
destinyXfate 2:0e2ef1edf01b 1047 png_save_uint_32(buf + 28, (png_uint_32)blue_y);
destinyXfate 2:0e2ef1edf01b 1048
destinyXfate 2:0e2ef1edf01b 1049 png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
destinyXfate 2:0e2ef1edf01b 1050 }
destinyXfate 2:0e2ef1edf01b 1051 #endif
destinyXfate 2:0e2ef1edf01b 1052 #endif
destinyXfate 2:0e2ef1edf01b 1053
destinyXfate 2:0e2ef1edf01b 1054 #if defined(PNG_WRITE_tRNS_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1055 /* write the tRNS chunk */
destinyXfate 2:0e2ef1edf01b 1056 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1057 png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
destinyXfate 2:0e2ef1edf01b 1058 int num_trans, int color_type)
destinyXfate 2:0e2ef1edf01b 1059 {
destinyXfate 2:0e2ef1edf01b 1060 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1061 PNG_tRNS;
destinyXfate 2:0e2ef1edf01b 1062 #endif
destinyXfate 2:0e2ef1edf01b 1063 png_byte buf[6];
destinyXfate 2:0e2ef1edf01b 1064
destinyXfate 2:0e2ef1edf01b 1065 png_debug(1, "in png_write_tRNS\n");
destinyXfate 2:0e2ef1edf01b 1066 if (color_type == PNG_COLOR_TYPE_PALETTE)
destinyXfate 2:0e2ef1edf01b 1067 {
destinyXfate 2:0e2ef1edf01b 1068 if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette)
destinyXfate 2:0e2ef1edf01b 1069 {
destinyXfate 2:0e2ef1edf01b 1070 png_warning(png_ptr,"Invalid number of transparent colors specified");
destinyXfate 2:0e2ef1edf01b 1071 return;
destinyXfate 2:0e2ef1edf01b 1072 }
destinyXfate 2:0e2ef1edf01b 1073 /* write the chunk out as it is */
destinyXfate 2:0e2ef1edf01b 1074 png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans, (png_size_t)num_trans);
destinyXfate 2:0e2ef1edf01b 1075 }
destinyXfate 2:0e2ef1edf01b 1076 else if (color_type == PNG_COLOR_TYPE_GRAY)
destinyXfate 2:0e2ef1edf01b 1077 {
destinyXfate 2:0e2ef1edf01b 1078 /* one 16 bit value */
destinyXfate 2:0e2ef1edf01b 1079 if(tran->gray >= (1 << png_ptr->bit_depth))
destinyXfate 2:0e2ef1edf01b 1080 {
destinyXfate 2:0e2ef1edf01b 1081 png_warning(png_ptr,
destinyXfate 2:0e2ef1edf01b 1082 "Ignoring attempt to write tRNS chunk out-of-range for bit_depth");
destinyXfate 2:0e2ef1edf01b 1083 return;
destinyXfate 2:0e2ef1edf01b 1084 }
destinyXfate 2:0e2ef1edf01b 1085 png_save_uint_16(buf, tran->gray);
destinyXfate 2:0e2ef1edf01b 1086 png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
destinyXfate 2:0e2ef1edf01b 1087 }
destinyXfate 2:0e2ef1edf01b 1088 else if (color_type == PNG_COLOR_TYPE_RGB)
destinyXfate 2:0e2ef1edf01b 1089 {
destinyXfate 2:0e2ef1edf01b 1090 /* three 16 bit values */
destinyXfate 2:0e2ef1edf01b 1091 png_save_uint_16(buf, tran->red);
destinyXfate 2:0e2ef1edf01b 1092 png_save_uint_16(buf + 2, tran->green);
destinyXfate 2:0e2ef1edf01b 1093 png_save_uint_16(buf + 4, tran->blue);
destinyXfate 2:0e2ef1edf01b 1094 if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
destinyXfate 2:0e2ef1edf01b 1095 {
destinyXfate 2:0e2ef1edf01b 1096 png_warning(png_ptr,
destinyXfate 2:0e2ef1edf01b 1097 "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
destinyXfate 2:0e2ef1edf01b 1098 return;
destinyXfate 2:0e2ef1edf01b 1099 }
destinyXfate 2:0e2ef1edf01b 1100 png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6);
destinyXfate 2:0e2ef1edf01b 1101 }
destinyXfate 2:0e2ef1edf01b 1102 else
destinyXfate 2:0e2ef1edf01b 1103 {
destinyXfate 2:0e2ef1edf01b 1104 png_warning(png_ptr, "Can't write tRNS with an alpha channel");
destinyXfate 2:0e2ef1edf01b 1105 }
destinyXfate 2:0e2ef1edf01b 1106 }
destinyXfate 2:0e2ef1edf01b 1107 #endif
destinyXfate 2:0e2ef1edf01b 1108
destinyXfate 2:0e2ef1edf01b 1109 #if defined(PNG_WRITE_bKGD_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1110 /* write the background chunk */
destinyXfate 2:0e2ef1edf01b 1111 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1112 png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
destinyXfate 2:0e2ef1edf01b 1113 {
destinyXfate 2:0e2ef1edf01b 1114 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1115 PNG_bKGD;
destinyXfate 2:0e2ef1edf01b 1116 #endif
destinyXfate 2:0e2ef1edf01b 1117 png_byte buf[6];
destinyXfate 2:0e2ef1edf01b 1118
destinyXfate 2:0e2ef1edf01b 1119 png_debug(1, "in png_write_bKGD\n");
destinyXfate 2:0e2ef1edf01b 1120 if (color_type == PNG_COLOR_TYPE_PALETTE)
destinyXfate 2:0e2ef1edf01b 1121 {
destinyXfate 2:0e2ef1edf01b 1122 if (
destinyXfate 2:0e2ef1edf01b 1123 #if defined(PNG_MNG_FEATURES_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1124 (png_ptr->num_palette ||
destinyXfate 2:0e2ef1edf01b 1125 (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&
destinyXfate 2:0e2ef1edf01b 1126 #endif
destinyXfate 2:0e2ef1edf01b 1127 back->index > png_ptr->num_palette)
destinyXfate 2:0e2ef1edf01b 1128 {
destinyXfate 2:0e2ef1edf01b 1129 png_warning(png_ptr, "Invalid background palette index");
destinyXfate 2:0e2ef1edf01b 1130 return;
destinyXfate 2:0e2ef1edf01b 1131 }
destinyXfate 2:0e2ef1edf01b 1132 buf[0] = back->index;
destinyXfate 2:0e2ef1edf01b 1133 png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1);
destinyXfate 2:0e2ef1edf01b 1134 }
destinyXfate 2:0e2ef1edf01b 1135 else if (color_type & PNG_COLOR_MASK_COLOR)
destinyXfate 2:0e2ef1edf01b 1136 {
destinyXfate 2:0e2ef1edf01b 1137 png_save_uint_16(buf, back->red);
destinyXfate 2:0e2ef1edf01b 1138 png_save_uint_16(buf + 2, back->green);
destinyXfate 2:0e2ef1edf01b 1139 png_save_uint_16(buf + 4, back->blue);
destinyXfate 2:0e2ef1edf01b 1140 if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
destinyXfate 2:0e2ef1edf01b 1141 {
destinyXfate 2:0e2ef1edf01b 1142 png_warning(png_ptr,
destinyXfate 2:0e2ef1edf01b 1143 "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
destinyXfate 2:0e2ef1edf01b 1144 return;
destinyXfate 2:0e2ef1edf01b 1145 }
destinyXfate 2:0e2ef1edf01b 1146 png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6);
destinyXfate 2:0e2ef1edf01b 1147 }
destinyXfate 2:0e2ef1edf01b 1148 else
destinyXfate 2:0e2ef1edf01b 1149 {
destinyXfate 2:0e2ef1edf01b 1150 if(back->gray >= (1 << png_ptr->bit_depth))
destinyXfate 2:0e2ef1edf01b 1151 {
destinyXfate 2:0e2ef1edf01b 1152 png_warning(png_ptr,
destinyXfate 2:0e2ef1edf01b 1153 "Ignoring attempt to write bKGD chunk out-of-range for bit_depth");
destinyXfate 2:0e2ef1edf01b 1154 return;
destinyXfate 2:0e2ef1edf01b 1155 }
destinyXfate 2:0e2ef1edf01b 1156 png_save_uint_16(buf, back->gray);
destinyXfate 2:0e2ef1edf01b 1157 png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
destinyXfate 2:0e2ef1edf01b 1158 }
destinyXfate 2:0e2ef1edf01b 1159 }
destinyXfate 2:0e2ef1edf01b 1160 #endif
destinyXfate 2:0e2ef1edf01b 1161
destinyXfate 2:0e2ef1edf01b 1162 #if defined(PNG_WRITE_hIST_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1163 /* write the histogram */
destinyXfate 2:0e2ef1edf01b 1164 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1165 png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
destinyXfate 2:0e2ef1edf01b 1166 {
destinyXfate 2:0e2ef1edf01b 1167 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1168 PNG_hIST;
destinyXfate 2:0e2ef1edf01b 1169 #endif
destinyXfate 2:0e2ef1edf01b 1170 int i;
destinyXfate 2:0e2ef1edf01b 1171 png_byte buf[3];
destinyXfate 2:0e2ef1edf01b 1172
destinyXfate 2:0e2ef1edf01b 1173 png_debug(1, "in png_write_hIST\n");
destinyXfate 2:0e2ef1edf01b 1174 if (num_hist > (int)png_ptr->num_palette)
destinyXfate 2:0e2ef1edf01b 1175 {
destinyXfate 2:0e2ef1edf01b 1176 png_debug2(3, "num_hist = %d, num_palette = %d\n", num_hist,
destinyXfate 2:0e2ef1edf01b 1177 png_ptr->num_palette);
destinyXfate 2:0e2ef1edf01b 1178 png_warning(png_ptr, "Invalid number of histogram entries specified");
destinyXfate 2:0e2ef1edf01b 1179 return;
destinyXfate 2:0e2ef1edf01b 1180 }
destinyXfate 2:0e2ef1edf01b 1181
destinyXfate 2:0e2ef1edf01b 1182 png_write_chunk_start(png_ptr, (png_bytep)png_hIST, (png_uint_32)(num_hist * 2));
destinyXfate 2:0e2ef1edf01b 1183 for (i = 0; i < num_hist; i++)
destinyXfate 2:0e2ef1edf01b 1184 {
destinyXfate 2:0e2ef1edf01b 1185 png_save_uint_16(buf, hist[i]);
destinyXfate 2:0e2ef1edf01b 1186 png_write_chunk_data(png_ptr, buf, (png_size_t)2);
destinyXfate 2:0e2ef1edf01b 1187 }
destinyXfate 2:0e2ef1edf01b 1188 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 1189 }
destinyXfate 2:0e2ef1edf01b 1190 #endif
destinyXfate 2:0e2ef1edf01b 1191
destinyXfate 2:0e2ef1edf01b 1192 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
destinyXfate 2:0e2ef1edf01b 1193 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1194 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
destinyXfate 2:0e2ef1edf01b 1195 * and if invalid, correct the keyword rather than discarding the entire
destinyXfate 2:0e2ef1edf01b 1196 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in
destinyXfate 2:0e2ef1edf01b 1197 * length, forbids leading or trailing whitespace, multiple internal spaces,
destinyXfate 2:0e2ef1edf01b 1198 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
destinyXfate 2:0e2ef1edf01b 1199 *
destinyXfate 2:0e2ef1edf01b 1200 * The new_key is allocated to hold the corrected keyword and must be freed
destinyXfate 2:0e2ef1edf01b 1201 * by the calling routine. This avoids problems with trying to write to
destinyXfate 2:0e2ef1edf01b 1202 * static keywords without having to have duplicate copies of the strings.
destinyXfate 2:0e2ef1edf01b 1203 */
destinyXfate 2:0e2ef1edf01b 1204 png_size_t /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1205 png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
destinyXfate 2:0e2ef1edf01b 1206 {
destinyXfate 2:0e2ef1edf01b 1207 png_size_t key_len;
destinyXfate 2:0e2ef1edf01b 1208 png_charp kp, dp;
destinyXfate 2:0e2ef1edf01b 1209 int kflag;
destinyXfate 2:0e2ef1edf01b 1210 int kwarn=0;
destinyXfate 2:0e2ef1edf01b 1211
destinyXfate 2:0e2ef1edf01b 1212 png_debug(1, "in png_check_keyword\n");
destinyXfate 2:0e2ef1edf01b 1213 *new_key = NULL;
destinyXfate 2:0e2ef1edf01b 1214
destinyXfate 2:0e2ef1edf01b 1215 if (key == NULL || (key_len = png_strlen(key)) == 0)
destinyXfate 2:0e2ef1edf01b 1216 {
destinyXfate 2:0e2ef1edf01b 1217 png_warning(png_ptr, "zero length keyword");
destinyXfate 2:0e2ef1edf01b 1218 return ((png_size_t)0);
destinyXfate 2:0e2ef1edf01b 1219 }
destinyXfate 2:0e2ef1edf01b 1220
destinyXfate 2:0e2ef1edf01b 1221 png_debug1(2, "Keyword to be checked is '%s'\n", key);
destinyXfate 2:0e2ef1edf01b 1222
destinyXfate 2:0e2ef1edf01b 1223 *new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2));
destinyXfate 2:0e2ef1edf01b 1224 if (*new_key == NULL)
destinyXfate 2:0e2ef1edf01b 1225 {
destinyXfate 2:0e2ef1edf01b 1226 png_warning(png_ptr, "Out of memory while procesing keyword");
destinyXfate 2:0e2ef1edf01b 1227 return ((png_size_t)0);
destinyXfate 2:0e2ef1edf01b 1228 }
destinyXfate 2:0e2ef1edf01b 1229
destinyXfate 2:0e2ef1edf01b 1230 /* Replace non-printing characters with a blank and print a warning */
destinyXfate 2:0e2ef1edf01b 1231 for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
destinyXfate 2:0e2ef1edf01b 1232 {
destinyXfate 2:0e2ef1edf01b 1233 if (*kp < 0x20 || (*kp > 0x7E && (png_byte)*kp < 0xA1))
destinyXfate 2:0e2ef1edf01b 1234 {
destinyXfate 2:0e2ef1edf01b 1235 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
destinyXfate 2:0e2ef1edf01b 1236 char msg[40];
destinyXfate 2:0e2ef1edf01b 1237
destinyXfate 2:0e2ef1edf01b 1238 sprintf(msg, "invalid keyword character 0x%02X", *kp);
destinyXfate 2:0e2ef1edf01b 1239 png_warning(png_ptr, msg);
destinyXfate 2:0e2ef1edf01b 1240 #else
destinyXfate 2:0e2ef1edf01b 1241 png_warning(png_ptr, "invalid character in keyword");
destinyXfate 2:0e2ef1edf01b 1242 #endif
destinyXfate 2:0e2ef1edf01b 1243 *dp = ' ';
destinyXfate 2:0e2ef1edf01b 1244 }
destinyXfate 2:0e2ef1edf01b 1245 else
destinyXfate 2:0e2ef1edf01b 1246 {
destinyXfate 2:0e2ef1edf01b 1247 *dp = *kp;
destinyXfate 2:0e2ef1edf01b 1248 }
destinyXfate 2:0e2ef1edf01b 1249 }
destinyXfate 2:0e2ef1edf01b 1250 *dp = '\0';
destinyXfate 2:0e2ef1edf01b 1251
destinyXfate 2:0e2ef1edf01b 1252 /* Remove any trailing white space. */
destinyXfate 2:0e2ef1edf01b 1253 kp = *new_key + key_len - 1;
destinyXfate 2:0e2ef1edf01b 1254 if (*kp == ' ')
destinyXfate 2:0e2ef1edf01b 1255 {
destinyXfate 2:0e2ef1edf01b 1256 png_warning(png_ptr, "trailing spaces removed from keyword");
destinyXfate 2:0e2ef1edf01b 1257
destinyXfate 2:0e2ef1edf01b 1258 while (*kp == ' ')
destinyXfate 2:0e2ef1edf01b 1259 {
destinyXfate 2:0e2ef1edf01b 1260 *(kp--) = '\0';
destinyXfate 2:0e2ef1edf01b 1261 key_len--;
destinyXfate 2:0e2ef1edf01b 1262 }
destinyXfate 2:0e2ef1edf01b 1263 }
destinyXfate 2:0e2ef1edf01b 1264
destinyXfate 2:0e2ef1edf01b 1265 /* Remove any leading white space. */
destinyXfate 2:0e2ef1edf01b 1266 kp = *new_key;
destinyXfate 2:0e2ef1edf01b 1267 if (*kp == ' ')
destinyXfate 2:0e2ef1edf01b 1268 {
destinyXfate 2:0e2ef1edf01b 1269 png_warning(png_ptr, "leading spaces removed from keyword");
destinyXfate 2:0e2ef1edf01b 1270
destinyXfate 2:0e2ef1edf01b 1271 while (*kp == ' ')
destinyXfate 2:0e2ef1edf01b 1272 {
destinyXfate 2:0e2ef1edf01b 1273 kp++;
destinyXfate 2:0e2ef1edf01b 1274 key_len--;
destinyXfate 2:0e2ef1edf01b 1275 }
destinyXfate 2:0e2ef1edf01b 1276 }
destinyXfate 2:0e2ef1edf01b 1277
destinyXfate 2:0e2ef1edf01b 1278 png_debug1(2, "Checking for multiple internal spaces in '%s'\n", kp);
destinyXfate 2:0e2ef1edf01b 1279
destinyXfate 2:0e2ef1edf01b 1280 /* Remove multiple internal spaces. */
destinyXfate 2:0e2ef1edf01b 1281 for (kflag = 0, dp = *new_key; *kp != '\0'; kp++)
destinyXfate 2:0e2ef1edf01b 1282 {
destinyXfate 2:0e2ef1edf01b 1283 if (*kp == ' ' && kflag == 0)
destinyXfate 2:0e2ef1edf01b 1284 {
destinyXfate 2:0e2ef1edf01b 1285 *(dp++) = *kp;
destinyXfate 2:0e2ef1edf01b 1286 kflag = 1;
destinyXfate 2:0e2ef1edf01b 1287 }
destinyXfate 2:0e2ef1edf01b 1288 else if (*kp == ' ')
destinyXfate 2:0e2ef1edf01b 1289 {
destinyXfate 2:0e2ef1edf01b 1290 key_len--;
destinyXfate 2:0e2ef1edf01b 1291 kwarn=1;
destinyXfate 2:0e2ef1edf01b 1292 }
destinyXfate 2:0e2ef1edf01b 1293 else
destinyXfate 2:0e2ef1edf01b 1294 {
destinyXfate 2:0e2ef1edf01b 1295 *(dp++) = *kp;
destinyXfate 2:0e2ef1edf01b 1296 kflag = 0;
destinyXfate 2:0e2ef1edf01b 1297 }
destinyXfate 2:0e2ef1edf01b 1298 }
destinyXfate 2:0e2ef1edf01b 1299 *dp = '\0';
destinyXfate 2:0e2ef1edf01b 1300 if(kwarn)
destinyXfate 2:0e2ef1edf01b 1301 png_warning(png_ptr, "extra interior spaces removed from keyword");
destinyXfate 2:0e2ef1edf01b 1302
destinyXfate 2:0e2ef1edf01b 1303 if (key_len == 0)
destinyXfate 2:0e2ef1edf01b 1304 {
destinyXfate 2:0e2ef1edf01b 1305 png_free(png_ptr, *new_key);
destinyXfate 2:0e2ef1edf01b 1306 *new_key=NULL;
destinyXfate 2:0e2ef1edf01b 1307 png_warning(png_ptr, "Zero length keyword");
destinyXfate 2:0e2ef1edf01b 1308 }
destinyXfate 2:0e2ef1edf01b 1309
destinyXfate 2:0e2ef1edf01b 1310 if (key_len > 79)
destinyXfate 2:0e2ef1edf01b 1311 {
destinyXfate 2:0e2ef1edf01b 1312 png_warning(png_ptr, "keyword length must be 1 - 79 characters");
destinyXfate 2:0e2ef1edf01b 1313 new_key[79] = '\0';
destinyXfate 2:0e2ef1edf01b 1314 key_len = 79;
destinyXfate 2:0e2ef1edf01b 1315 }
destinyXfate 2:0e2ef1edf01b 1316
destinyXfate 2:0e2ef1edf01b 1317 return (key_len);
destinyXfate 2:0e2ef1edf01b 1318 }
destinyXfate 2:0e2ef1edf01b 1319 #endif
destinyXfate 2:0e2ef1edf01b 1320
destinyXfate 2:0e2ef1edf01b 1321 #if defined(PNG_WRITE_tEXt_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1322 /* write a tEXt chunk */
destinyXfate 2:0e2ef1edf01b 1323 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1324 png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
destinyXfate 2:0e2ef1edf01b 1325 png_size_t text_len)
destinyXfate 2:0e2ef1edf01b 1326 {
destinyXfate 2:0e2ef1edf01b 1327 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1328 PNG_tEXt;
destinyXfate 2:0e2ef1edf01b 1329 #endif
destinyXfate 2:0e2ef1edf01b 1330 png_size_t key_len;
destinyXfate 2:0e2ef1edf01b 1331 png_charp new_key;
destinyXfate 2:0e2ef1edf01b 1332
destinyXfate 2:0e2ef1edf01b 1333 png_debug(1, "in png_write_tEXt\n");
destinyXfate 2:0e2ef1edf01b 1334 if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
destinyXfate 2:0e2ef1edf01b 1335 {
destinyXfate 2:0e2ef1edf01b 1336 png_warning(png_ptr, "Empty keyword in tEXt chunk");
destinyXfate 2:0e2ef1edf01b 1337 return;
destinyXfate 2:0e2ef1edf01b 1338 }
destinyXfate 2:0e2ef1edf01b 1339
destinyXfate 2:0e2ef1edf01b 1340 if (text == NULL || *text == '\0')
destinyXfate 2:0e2ef1edf01b 1341 text_len = 0;
destinyXfate 2:0e2ef1edf01b 1342 else
destinyXfate 2:0e2ef1edf01b 1343 text_len = png_strlen(text);
destinyXfate 2:0e2ef1edf01b 1344
destinyXfate 2:0e2ef1edf01b 1345 /* make sure we include the 0 after the key */
destinyXfate 2:0e2ef1edf01b 1346 png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1);
destinyXfate 2:0e2ef1edf01b 1347 /*
destinyXfate 2:0e2ef1edf01b 1348 * We leave it to the application to meet PNG-1.0 requirements on the
destinyXfate 2:0e2ef1edf01b 1349 * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
destinyXfate 2:0e2ef1edf01b 1350 * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.
destinyXfate 2:0e2ef1edf01b 1351 * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
destinyXfate 2:0e2ef1edf01b 1352 */
destinyXfate 2:0e2ef1edf01b 1353 png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
destinyXfate 2:0e2ef1edf01b 1354 if (text_len)
destinyXfate 2:0e2ef1edf01b 1355 png_write_chunk_data(png_ptr, (png_bytep)text, text_len);
destinyXfate 2:0e2ef1edf01b 1356
destinyXfate 2:0e2ef1edf01b 1357 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 1358 png_free(png_ptr, new_key);
destinyXfate 2:0e2ef1edf01b 1359 }
destinyXfate 2:0e2ef1edf01b 1360 #endif
destinyXfate 2:0e2ef1edf01b 1361
destinyXfate 2:0e2ef1edf01b 1362 #if defined(PNG_WRITE_zTXt_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1363 /* write a compressed text chunk */
destinyXfate 2:0e2ef1edf01b 1364 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1365 png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
destinyXfate 2:0e2ef1edf01b 1366 png_size_t text_len, int compression)
destinyXfate 2:0e2ef1edf01b 1367 {
destinyXfate 2:0e2ef1edf01b 1368 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1369 PNG_zTXt;
destinyXfate 2:0e2ef1edf01b 1370 #endif
destinyXfate 2:0e2ef1edf01b 1371 png_size_t key_len;
destinyXfate 2:0e2ef1edf01b 1372 char buf[1];
destinyXfate 2:0e2ef1edf01b 1373 png_charp new_key;
destinyXfate 2:0e2ef1edf01b 1374 compression_state comp;
destinyXfate 2:0e2ef1edf01b 1375
destinyXfate 2:0e2ef1edf01b 1376 png_debug(1, "in png_write_zTXt\n");
destinyXfate 2:0e2ef1edf01b 1377
destinyXfate 2:0e2ef1edf01b 1378 comp.num_output_ptr = 0;
destinyXfate 2:0e2ef1edf01b 1379 comp.max_output_ptr = 0;
destinyXfate 2:0e2ef1edf01b 1380 comp.output_ptr = NULL;
destinyXfate 2:0e2ef1edf01b 1381 comp.input = NULL;
destinyXfate 2:0e2ef1edf01b 1382 comp.input_len = 0;
destinyXfate 2:0e2ef1edf01b 1383
destinyXfate 2:0e2ef1edf01b 1384 if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
destinyXfate 2:0e2ef1edf01b 1385 {
destinyXfate 2:0e2ef1edf01b 1386 png_warning(png_ptr, "Empty keyword in zTXt chunk");
destinyXfate 2:0e2ef1edf01b 1387 return;
destinyXfate 2:0e2ef1edf01b 1388 }
destinyXfate 2:0e2ef1edf01b 1389
destinyXfate 2:0e2ef1edf01b 1390 if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE)
destinyXfate 2:0e2ef1edf01b 1391 {
destinyXfate 2:0e2ef1edf01b 1392 png_write_tEXt(png_ptr, new_key, text, (png_size_t)0);
destinyXfate 2:0e2ef1edf01b 1393 png_free(png_ptr, new_key);
destinyXfate 2:0e2ef1edf01b 1394 return;
destinyXfate 2:0e2ef1edf01b 1395 }
destinyXfate 2:0e2ef1edf01b 1396
destinyXfate 2:0e2ef1edf01b 1397 text_len = png_strlen(text);
destinyXfate 2:0e2ef1edf01b 1398
destinyXfate 2:0e2ef1edf01b 1399 png_free(png_ptr, new_key);
destinyXfate 2:0e2ef1edf01b 1400
destinyXfate 2:0e2ef1edf01b 1401 /* compute the compressed data; do it now for the length */
destinyXfate 2:0e2ef1edf01b 1402 text_len = png_text_compress(png_ptr, text, text_len, compression,
destinyXfate 2:0e2ef1edf01b 1403 &comp);
destinyXfate 2:0e2ef1edf01b 1404
destinyXfate 2:0e2ef1edf01b 1405 /* write start of chunk */
destinyXfate 2:0e2ef1edf01b 1406 png_write_chunk_start(png_ptr, (png_bytep)png_zTXt, (png_uint_32)
destinyXfate 2:0e2ef1edf01b 1407 (key_len+text_len+2));
destinyXfate 2:0e2ef1edf01b 1408 /* write key */
destinyXfate 2:0e2ef1edf01b 1409 png_write_chunk_data(png_ptr, (png_bytep)key, key_len + 1);
destinyXfate 2:0e2ef1edf01b 1410 buf[0] = (png_byte)compression;
destinyXfate 2:0e2ef1edf01b 1411 /* write compression */
destinyXfate 2:0e2ef1edf01b 1412 png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
destinyXfate 2:0e2ef1edf01b 1413 /* write the compressed data */
destinyXfate 2:0e2ef1edf01b 1414 png_write_compressed_data_out(png_ptr, &comp);
destinyXfate 2:0e2ef1edf01b 1415
destinyXfate 2:0e2ef1edf01b 1416 /* close the chunk */
destinyXfate 2:0e2ef1edf01b 1417 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 1418 }
destinyXfate 2:0e2ef1edf01b 1419 #endif
destinyXfate 2:0e2ef1edf01b 1420
destinyXfate 2:0e2ef1edf01b 1421 #if defined(PNG_WRITE_iTXt_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1422 /* write an iTXt chunk */
destinyXfate 2:0e2ef1edf01b 1423 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1424 png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
destinyXfate 2:0e2ef1edf01b 1425 png_charp lang, png_charp lang_key, png_charp text)
destinyXfate 2:0e2ef1edf01b 1426 {
destinyXfate 2:0e2ef1edf01b 1427 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1428 PNG_iTXt;
destinyXfate 2:0e2ef1edf01b 1429 #endif
destinyXfate 2:0e2ef1edf01b 1430 png_size_t lang_len, key_len, lang_key_len, text_len;
destinyXfate 2:0e2ef1edf01b 1431 png_charp new_lang, new_key;
destinyXfate 2:0e2ef1edf01b 1432 png_byte cbuf[2];
destinyXfate 2:0e2ef1edf01b 1433 compression_state comp;
destinyXfate 2:0e2ef1edf01b 1434
destinyXfate 2:0e2ef1edf01b 1435 png_debug(1, "in png_write_iTXt\n");
destinyXfate 2:0e2ef1edf01b 1436
destinyXfate 2:0e2ef1edf01b 1437 comp.num_output_ptr = 0;
destinyXfate 2:0e2ef1edf01b 1438 comp.max_output_ptr = 0;
destinyXfate 2:0e2ef1edf01b 1439 comp.output_ptr = NULL;
destinyXfate 2:0e2ef1edf01b 1440 comp.input = NULL;
destinyXfate 2:0e2ef1edf01b 1441
destinyXfate 2:0e2ef1edf01b 1442 if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
destinyXfate 2:0e2ef1edf01b 1443 {
destinyXfate 2:0e2ef1edf01b 1444 png_warning(png_ptr, "Empty keyword in iTXt chunk");
destinyXfate 2:0e2ef1edf01b 1445 return;
destinyXfate 2:0e2ef1edf01b 1446 }
destinyXfate 2:0e2ef1edf01b 1447 if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0)
destinyXfate 2:0e2ef1edf01b 1448 {
destinyXfate 2:0e2ef1edf01b 1449 png_warning(png_ptr, "Empty language field in iTXt chunk");
destinyXfate 2:0e2ef1edf01b 1450 new_lang = NULL;
destinyXfate 2:0e2ef1edf01b 1451 lang_len = 0;
destinyXfate 2:0e2ef1edf01b 1452 }
destinyXfate 2:0e2ef1edf01b 1453
destinyXfate 2:0e2ef1edf01b 1454 if (lang_key == NULL)
destinyXfate 2:0e2ef1edf01b 1455 lang_key_len = 0;
destinyXfate 2:0e2ef1edf01b 1456 else
destinyXfate 2:0e2ef1edf01b 1457 lang_key_len = png_strlen(lang_key);
destinyXfate 2:0e2ef1edf01b 1458
destinyXfate 2:0e2ef1edf01b 1459 if (text == NULL)
destinyXfate 2:0e2ef1edf01b 1460 text_len = 0;
destinyXfate 2:0e2ef1edf01b 1461 else
destinyXfate 2:0e2ef1edf01b 1462 text_len = png_strlen(text);
destinyXfate 2:0e2ef1edf01b 1463
destinyXfate 2:0e2ef1edf01b 1464 /* compute the compressed data; do it now for the length */
destinyXfate 2:0e2ef1edf01b 1465 text_len = png_text_compress(png_ptr, text, text_len, compression-2,
destinyXfate 2:0e2ef1edf01b 1466 &comp);
destinyXfate 2:0e2ef1edf01b 1467
destinyXfate 2:0e2ef1edf01b 1468
destinyXfate 2:0e2ef1edf01b 1469 /* make sure we include the compression flag, the compression byte,
destinyXfate 2:0e2ef1edf01b 1470 * and the NULs after the key, lang, and lang_key parts */
destinyXfate 2:0e2ef1edf01b 1471
destinyXfate 2:0e2ef1edf01b 1472 png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
destinyXfate 2:0e2ef1edf01b 1473 (png_uint_32)(
destinyXfate 2:0e2ef1edf01b 1474 5 /* comp byte, comp flag, terminators for key, lang and lang_key */
destinyXfate 2:0e2ef1edf01b 1475 + key_len
destinyXfate 2:0e2ef1edf01b 1476 + lang_len
destinyXfate 2:0e2ef1edf01b 1477 + lang_key_len
destinyXfate 2:0e2ef1edf01b 1478 + text_len));
destinyXfate 2:0e2ef1edf01b 1479
destinyXfate 2:0e2ef1edf01b 1480 /*
destinyXfate 2:0e2ef1edf01b 1481 * We leave it to the application to meet PNG-1.0 requirements on the
destinyXfate 2:0e2ef1edf01b 1482 * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
destinyXfate 2:0e2ef1edf01b 1483 * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.
destinyXfate 2:0e2ef1edf01b 1484 * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
destinyXfate 2:0e2ef1edf01b 1485 */
destinyXfate 2:0e2ef1edf01b 1486 png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
destinyXfate 2:0e2ef1edf01b 1487
destinyXfate 2:0e2ef1edf01b 1488 /* set the compression flag */
destinyXfate 2:0e2ef1edf01b 1489 if (compression == PNG_ITXT_COMPRESSION_NONE || \
destinyXfate 2:0e2ef1edf01b 1490 compression == PNG_TEXT_COMPRESSION_NONE)
destinyXfate 2:0e2ef1edf01b 1491 cbuf[0] = 0;
destinyXfate 2:0e2ef1edf01b 1492 else /* compression == PNG_ITXT_COMPRESSION_zTXt */
destinyXfate 2:0e2ef1edf01b 1493 cbuf[0] = 1;
destinyXfate 2:0e2ef1edf01b 1494 /* set the compression method */
destinyXfate 2:0e2ef1edf01b 1495 cbuf[1] = 0;
destinyXfate 2:0e2ef1edf01b 1496 png_write_chunk_data(png_ptr, cbuf, 2);
destinyXfate 2:0e2ef1edf01b 1497
destinyXfate 2:0e2ef1edf01b 1498 cbuf[0] = 0;
destinyXfate 2:0e2ef1edf01b 1499 png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), lang_len + 1);
destinyXfate 2:0e2ef1edf01b 1500 png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), lang_key_len + 1);
destinyXfate 2:0e2ef1edf01b 1501 png_write_compressed_data_out(png_ptr, &comp);
destinyXfate 2:0e2ef1edf01b 1502
destinyXfate 2:0e2ef1edf01b 1503 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 1504 png_free(png_ptr, new_key);
destinyXfate 2:0e2ef1edf01b 1505 if (new_lang)
destinyXfate 2:0e2ef1edf01b 1506 png_free(png_ptr, new_lang);
destinyXfate 2:0e2ef1edf01b 1507 }
destinyXfate 2:0e2ef1edf01b 1508 #endif
destinyXfate 2:0e2ef1edf01b 1509
destinyXfate 2:0e2ef1edf01b 1510 #if defined(PNG_WRITE_oFFs_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1511 /* write the oFFs chunk */
destinyXfate 2:0e2ef1edf01b 1512 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1513 png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
destinyXfate 2:0e2ef1edf01b 1514 int unit_type)
destinyXfate 2:0e2ef1edf01b 1515 {
destinyXfate 2:0e2ef1edf01b 1516 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1517 PNG_oFFs;
destinyXfate 2:0e2ef1edf01b 1518 #endif
destinyXfate 2:0e2ef1edf01b 1519 png_byte buf[9];
destinyXfate 2:0e2ef1edf01b 1520
destinyXfate 2:0e2ef1edf01b 1521 png_debug(1, "in png_write_oFFs\n");
destinyXfate 2:0e2ef1edf01b 1522 if (unit_type >= PNG_OFFSET_LAST)
destinyXfate 2:0e2ef1edf01b 1523 png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");
destinyXfate 2:0e2ef1edf01b 1524
destinyXfate 2:0e2ef1edf01b 1525 png_save_int_32(buf, x_offset);
destinyXfate 2:0e2ef1edf01b 1526 png_save_int_32(buf + 4, y_offset);
destinyXfate 2:0e2ef1edf01b 1527 buf[8] = (png_byte)unit_type;
destinyXfate 2:0e2ef1edf01b 1528
destinyXfate 2:0e2ef1edf01b 1529 png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
destinyXfate 2:0e2ef1edf01b 1530 }
destinyXfate 2:0e2ef1edf01b 1531 #endif
destinyXfate 2:0e2ef1edf01b 1532
destinyXfate 2:0e2ef1edf01b 1533 #if defined(PNG_WRITE_pCAL_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1534 /* write the pCAL chunk (described in the PNG extensions document) */
destinyXfate 2:0e2ef1edf01b 1535 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1536 png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
destinyXfate 2:0e2ef1edf01b 1537 png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)
destinyXfate 2:0e2ef1edf01b 1538 {
destinyXfate 2:0e2ef1edf01b 1539 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1540 PNG_pCAL;
destinyXfate 2:0e2ef1edf01b 1541 #endif
destinyXfate 2:0e2ef1edf01b 1542 png_size_t purpose_len, units_len, total_len;
destinyXfate 2:0e2ef1edf01b 1543 png_uint_32p params_len;
destinyXfate 2:0e2ef1edf01b 1544 png_byte buf[10];
destinyXfate 2:0e2ef1edf01b 1545 png_charp new_purpose;
destinyXfate 2:0e2ef1edf01b 1546 int i;
destinyXfate 2:0e2ef1edf01b 1547
destinyXfate 2:0e2ef1edf01b 1548 png_debug1(1, "in png_write_pCAL (%d parameters)\n", nparams);
destinyXfate 2:0e2ef1edf01b 1549 if (type >= PNG_EQUATION_LAST)
destinyXfate 2:0e2ef1edf01b 1550 png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
destinyXfate 2:0e2ef1edf01b 1551
destinyXfate 2:0e2ef1edf01b 1552 purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1;
destinyXfate 2:0e2ef1edf01b 1553 png_debug1(3, "pCAL purpose length = %d\n", (int)purpose_len);
destinyXfate 2:0e2ef1edf01b 1554 units_len = png_strlen(units) + (nparams == 0 ? 0 : 1);
destinyXfate 2:0e2ef1edf01b 1555 png_debug1(3, "pCAL units length = %d\n", (int)units_len);
destinyXfate 2:0e2ef1edf01b 1556 total_len = purpose_len + units_len + 10;
destinyXfate 2:0e2ef1edf01b 1557
destinyXfate 2:0e2ef1edf01b 1558 params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams
destinyXfate 2:0e2ef1edf01b 1559 *png_sizeof(png_uint_32)));
destinyXfate 2:0e2ef1edf01b 1560
destinyXfate 2:0e2ef1edf01b 1561 /* Find the length of each parameter, making sure we don't count the
destinyXfate 2:0e2ef1edf01b 1562 null terminator for the last parameter. */
destinyXfate 2:0e2ef1edf01b 1563 for (i = 0; i < nparams; i++)
destinyXfate 2:0e2ef1edf01b 1564 {
destinyXfate 2:0e2ef1edf01b 1565 params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1);
destinyXfate 2:0e2ef1edf01b 1566 png_debug2(3, "pCAL parameter %d length = %lu\n", i, params_len[i]);
destinyXfate 2:0e2ef1edf01b 1567 total_len += (png_size_t)params_len[i];
destinyXfate 2:0e2ef1edf01b 1568 }
destinyXfate 2:0e2ef1edf01b 1569
destinyXfate 2:0e2ef1edf01b 1570 png_debug1(3, "pCAL total length = %d\n", (int)total_len);
destinyXfate 2:0e2ef1edf01b 1571 png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len);
destinyXfate 2:0e2ef1edf01b 1572 png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len);
destinyXfate 2:0e2ef1edf01b 1573 png_save_int_32(buf, X0);
destinyXfate 2:0e2ef1edf01b 1574 png_save_int_32(buf + 4, X1);
destinyXfate 2:0e2ef1edf01b 1575 buf[8] = (png_byte)type;
destinyXfate 2:0e2ef1edf01b 1576 buf[9] = (png_byte)nparams;
destinyXfate 2:0e2ef1edf01b 1577 png_write_chunk_data(png_ptr, buf, (png_size_t)10);
destinyXfate 2:0e2ef1edf01b 1578 png_write_chunk_data(png_ptr, (png_bytep)units, (png_size_t)units_len);
destinyXfate 2:0e2ef1edf01b 1579
destinyXfate 2:0e2ef1edf01b 1580 png_free(png_ptr, new_purpose);
destinyXfate 2:0e2ef1edf01b 1581
destinyXfate 2:0e2ef1edf01b 1582 for (i = 0; i < nparams; i++)
destinyXfate 2:0e2ef1edf01b 1583 {
destinyXfate 2:0e2ef1edf01b 1584 png_write_chunk_data(png_ptr, (png_bytep)params[i],
destinyXfate 2:0e2ef1edf01b 1585 (png_size_t)params_len[i]);
destinyXfate 2:0e2ef1edf01b 1586 }
destinyXfate 2:0e2ef1edf01b 1587
destinyXfate 2:0e2ef1edf01b 1588 png_free(png_ptr, params_len);
destinyXfate 2:0e2ef1edf01b 1589 png_write_chunk_end(png_ptr);
destinyXfate 2:0e2ef1edf01b 1590 }
destinyXfate 2:0e2ef1edf01b 1591 #endif
destinyXfate 2:0e2ef1edf01b 1592
destinyXfate 2:0e2ef1edf01b 1593 #if defined(PNG_WRITE_sCAL_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1594 /* write the sCAL chunk */
destinyXfate 2:0e2ef1edf01b 1595 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
destinyXfate 2:0e2ef1edf01b 1596 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1597 png_write_sCAL(png_structp png_ptr, int unit, double width, double height)
destinyXfate 2:0e2ef1edf01b 1598 {
destinyXfate 2:0e2ef1edf01b 1599 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1600 PNG_sCAL;
destinyXfate 2:0e2ef1edf01b 1601 #endif
destinyXfate 2:0e2ef1edf01b 1602 char buf[64];
destinyXfate 2:0e2ef1edf01b 1603 png_size_t total_len;
destinyXfate 2:0e2ef1edf01b 1604
destinyXfate 2:0e2ef1edf01b 1605 png_debug(1, "in png_write_sCAL\n");
destinyXfate 2:0e2ef1edf01b 1606
destinyXfate 2:0e2ef1edf01b 1607 buf[0] = (char)unit;
destinyXfate 2:0e2ef1edf01b 1608 #if defined(_WIN32_WCE)
destinyXfate 2:0e2ef1edf01b 1609 /* sprintf() function is not supported on WindowsCE */
destinyXfate 2:0e2ef1edf01b 1610 {
destinyXfate 2:0e2ef1edf01b 1611 wchar_t wc_buf[32];
destinyXfate 2:0e2ef1edf01b 1612 size_t wc_len;
destinyXfate 2:0e2ef1edf01b 1613 swprintf(wc_buf, TEXT("%12.12e"), width);
destinyXfate 2:0e2ef1edf01b 1614 wc_len = wcslen(wc_buf);
destinyXfate 2:0e2ef1edf01b 1615 WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + 1, wc_len, NULL, NULL);
destinyXfate 2:0e2ef1edf01b 1616 total_len = wc_len + 2;
destinyXfate 2:0e2ef1edf01b 1617 swprintf(wc_buf, TEXT("%12.12e"), height);
destinyXfate 2:0e2ef1edf01b 1618 wc_len = wcslen(wc_buf);
destinyXfate 2:0e2ef1edf01b 1619 WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + total_len, wc_len,
destinyXfate 2:0e2ef1edf01b 1620 NULL, NULL);
destinyXfate 2:0e2ef1edf01b 1621 total_len += wc_len;
destinyXfate 2:0e2ef1edf01b 1622 }
destinyXfate 2:0e2ef1edf01b 1623 #else
destinyXfate 2:0e2ef1edf01b 1624 sprintf(buf + 1, "%12.12e", width);
destinyXfate 2:0e2ef1edf01b 1625 total_len = 1 + png_strlen(buf + 1) + 1;
destinyXfate 2:0e2ef1edf01b 1626 sprintf(buf + total_len, "%12.12e", height);
destinyXfate 2:0e2ef1edf01b 1627 total_len += png_strlen(buf + total_len);
destinyXfate 2:0e2ef1edf01b 1628 #endif
destinyXfate 2:0e2ef1edf01b 1629
destinyXfate 2:0e2ef1edf01b 1630 png_debug1(3, "sCAL total length = %u\n", (unsigned int)total_len);
destinyXfate 2:0e2ef1edf01b 1631 png_write_chunk(png_ptr, (png_bytep)png_sCAL, (png_bytep)buf, total_len);
destinyXfate 2:0e2ef1edf01b 1632 }
destinyXfate 2:0e2ef1edf01b 1633 #else
destinyXfate 2:0e2ef1edf01b 1634 #ifdef PNG_FIXED_POINT_SUPPORTED
destinyXfate 2:0e2ef1edf01b 1635 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1636 png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
destinyXfate 2:0e2ef1edf01b 1637 png_charp height)
destinyXfate 2:0e2ef1edf01b 1638 {
destinyXfate 2:0e2ef1edf01b 1639 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1640 PNG_sCAL;
destinyXfate 2:0e2ef1edf01b 1641 #endif
destinyXfate 2:0e2ef1edf01b 1642 png_byte buf[64];
destinyXfate 2:0e2ef1edf01b 1643 png_size_t wlen, hlen, total_len;
destinyXfate 2:0e2ef1edf01b 1644
destinyXfate 2:0e2ef1edf01b 1645 png_debug(1, "in png_write_sCAL_s\n");
destinyXfate 2:0e2ef1edf01b 1646
destinyXfate 2:0e2ef1edf01b 1647 wlen = png_strlen(width);
destinyXfate 2:0e2ef1edf01b 1648 hlen = png_strlen(height);
destinyXfate 2:0e2ef1edf01b 1649 total_len = wlen + hlen + 2;
destinyXfate 2:0e2ef1edf01b 1650 if (total_len > 64)
destinyXfate 2:0e2ef1edf01b 1651 {
destinyXfate 2:0e2ef1edf01b 1652 png_warning(png_ptr, "Can't write sCAL (buffer too small)");
destinyXfate 2:0e2ef1edf01b 1653 return;
destinyXfate 2:0e2ef1edf01b 1654 }
destinyXfate 2:0e2ef1edf01b 1655
destinyXfate 2:0e2ef1edf01b 1656 buf[0] = (png_byte)unit;
destinyXfate 2:0e2ef1edf01b 1657 png_memcpy(buf + 1, width, wlen + 1); /* append the '\0' here */
destinyXfate 2:0e2ef1edf01b 1658 png_memcpy(buf + wlen + 2, height, hlen); /* do NOT append the '\0' here */
destinyXfate 2:0e2ef1edf01b 1659
destinyXfate 2:0e2ef1edf01b 1660 png_debug1(3, "sCAL total length = %u\n", (unsigned int)total_len);
destinyXfate 2:0e2ef1edf01b 1661 png_write_chunk(png_ptr, (png_bytep)png_sCAL, buf, total_len);
destinyXfate 2:0e2ef1edf01b 1662 }
destinyXfate 2:0e2ef1edf01b 1663 #endif
destinyXfate 2:0e2ef1edf01b 1664 #endif
destinyXfate 2:0e2ef1edf01b 1665 #endif
destinyXfate 2:0e2ef1edf01b 1666
destinyXfate 2:0e2ef1edf01b 1667 #if defined(PNG_WRITE_pHYs_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1668 /* write the pHYs chunk */
destinyXfate 2:0e2ef1edf01b 1669 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1670 png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
destinyXfate 2:0e2ef1edf01b 1671 png_uint_32 y_pixels_per_unit,
destinyXfate 2:0e2ef1edf01b 1672 int unit_type)
destinyXfate 2:0e2ef1edf01b 1673 {
destinyXfate 2:0e2ef1edf01b 1674 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1675 PNG_pHYs;
destinyXfate 2:0e2ef1edf01b 1676 #endif
destinyXfate 2:0e2ef1edf01b 1677 png_byte buf[9];
destinyXfate 2:0e2ef1edf01b 1678
destinyXfate 2:0e2ef1edf01b 1679 png_debug(1, "in png_write_pHYs\n");
destinyXfate 2:0e2ef1edf01b 1680 if (unit_type >= PNG_RESOLUTION_LAST)
destinyXfate 2:0e2ef1edf01b 1681 png_warning(png_ptr, "Unrecognized unit type for pHYs chunk");
destinyXfate 2:0e2ef1edf01b 1682
destinyXfate 2:0e2ef1edf01b 1683 png_save_uint_32(buf, x_pixels_per_unit);
destinyXfate 2:0e2ef1edf01b 1684 png_save_uint_32(buf + 4, y_pixels_per_unit);
destinyXfate 2:0e2ef1edf01b 1685 buf[8] = (png_byte)unit_type;
destinyXfate 2:0e2ef1edf01b 1686
destinyXfate 2:0e2ef1edf01b 1687 png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9);
destinyXfate 2:0e2ef1edf01b 1688 }
destinyXfate 2:0e2ef1edf01b 1689 #endif
destinyXfate 2:0e2ef1edf01b 1690
destinyXfate 2:0e2ef1edf01b 1691 #if defined(PNG_WRITE_tIME_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1692 /* Write the tIME chunk. Use either png_convert_from_struct_tm()
destinyXfate 2:0e2ef1edf01b 1693 * or png_convert_from_time_t(), or fill in the structure yourself.
destinyXfate 2:0e2ef1edf01b 1694 */
destinyXfate 2:0e2ef1edf01b 1695 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1696 png_write_tIME(png_structp png_ptr, png_timep mod_time)
destinyXfate 2:0e2ef1edf01b 1697 {
destinyXfate 2:0e2ef1edf01b 1698 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1699 PNG_tIME;
destinyXfate 2:0e2ef1edf01b 1700 #endif
destinyXfate 2:0e2ef1edf01b 1701 png_byte buf[7];
destinyXfate 2:0e2ef1edf01b 1702
destinyXfate 2:0e2ef1edf01b 1703 png_debug(1, "in png_write_tIME\n");
destinyXfate 2:0e2ef1edf01b 1704 if (mod_time->month > 12 || mod_time->month < 1 ||
destinyXfate 2:0e2ef1edf01b 1705 mod_time->day > 31 || mod_time->day < 1 ||
destinyXfate 2:0e2ef1edf01b 1706 mod_time->hour > 23 || mod_time->second > 60)
destinyXfate 2:0e2ef1edf01b 1707 {
destinyXfate 2:0e2ef1edf01b 1708 png_warning(png_ptr, "Invalid time specified for tIME chunk");
destinyXfate 2:0e2ef1edf01b 1709 return;
destinyXfate 2:0e2ef1edf01b 1710 }
destinyXfate 2:0e2ef1edf01b 1711
destinyXfate 2:0e2ef1edf01b 1712 png_save_uint_16(buf, mod_time->year);
destinyXfate 2:0e2ef1edf01b 1713 buf[2] = mod_time->month;
destinyXfate 2:0e2ef1edf01b 1714 buf[3] = mod_time->day;
destinyXfate 2:0e2ef1edf01b 1715 buf[4] = mod_time->hour;
destinyXfate 2:0e2ef1edf01b 1716 buf[5] = mod_time->minute;
destinyXfate 2:0e2ef1edf01b 1717 buf[6] = mod_time->second;
destinyXfate 2:0e2ef1edf01b 1718
destinyXfate 2:0e2ef1edf01b 1719 png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7);
destinyXfate 2:0e2ef1edf01b 1720 }
destinyXfate 2:0e2ef1edf01b 1721 #endif
destinyXfate 2:0e2ef1edf01b 1722
destinyXfate 2:0e2ef1edf01b 1723 /* initializes the row writing capability of libpng */
destinyXfate 2:0e2ef1edf01b 1724 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1725 png_write_start_row(png_structp png_ptr)
destinyXfate 2:0e2ef1edf01b 1726 {
destinyXfate 2:0e2ef1edf01b 1727 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1728 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
destinyXfate 2:0e2ef1edf01b 1729
destinyXfate 2:0e2ef1edf01b 1730 /* start of interlace block */
destinyXfate 2:0e2ef1edf01b 1731 int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
destinyXfate 2:0e2ef1edf01b 1732
destinyXfate 2:0e2ef1edf01b 1733 /* offset to next interlace block */
destinyXfate 2:0e2ef1edf01b 1734 int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
destinyXfate 2:0e2ef1edf01b 1735
destinyXfate 2:0e2ef1edf01b 1736 /* start of interlace block in the y direction */
destinyXfate 2:0e2ef1edf01b 1737 int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
destinyXfate 2:0e2ef1edf01b 1738
destinyXfate 2:0e2ef1edf01b 1739 /* offset to next interlace block in the y direction */
destinyXfate 2:0e2ef1edf01b 1740 int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
destinyXfate 2:0e2ef1edf01b 1741 #endif
destinyXfate 2:0e2ef1edf01b 1742
destinyXfate 2:0e2ef1edf01b 1743 png_size_t buf_size;
destinyXfate 2:0e2ef1edf01b 1744
destinyXfate 2:0e2ef1edf01b 1745 png_debug(1, "in png_write_start_row\n");
destinyXfate 2:0e2ef1edf01b 1746 buf_size = (png_size_t)(PNG_ROWBYTES(
destinyXfate 2:0e2ef1edf01b 1747 png_ptr->usr_channels*png_ptr->usr_bit_depth,png_ptr->width)+1);
destinyXfate 2:0e2ef1edf01b 1748
destinyXfate 2:0e2ef1edf01b 1749 /* set up row buffer */
destinyXfate 2:0e2ef1edf01b 1750 png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
destinyXfate 2:0e2ef1edf01b 1751 png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
destinyXfate 2:0e2ef1edf01b 1752
destinyXfate 2:0e2ef1edf01b 1753 /* set up filtering buffer, if using this filter */
destinyXfate 2:0e2ef1edf01b 1754 if (png_ptr->do_filter & PNG_FILTER_SUB)
destinyXfate 2:0e2ef1edf01b 1755 {
destinyXfate 2:0e2ef1edf01b 1756 png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 1757 (png_ptr->rowbytes + 1));
destinyXfate 2:0e2ef1edf01b 1758 png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
destinyXfate 2:0e2ef1edf01b 1759 }
destinyXfate 2:0e2ef1edf01b 1760
destinyXfate 2:0e2ef1edf01b 1761 /* We only need to keep the previous row if we are using one of these. */
destinyXfate 2:0e2ef1edf01b 1762 if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))
destinyXfate 2:0e2ef1edf01b 1763 {
destinyXfate 2:0e2ef1edf01b 1764 /* set up previous row buffer */
destinyXfate 2:0e2ef1edf01b 1765 png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
destinyXfate 2:0e2ef1edf01b 1766 png_memset(png_ptr->prev_row, 0, buf_size);
destinyXfate 2:0e2ef1edf01b 1767
destinyXfate 2:0e2ef1edf01b 1768 if (png_ptr->do_filter & PNG_FILTER_UP)
destinyXfate 2:0e2ef1edf01b 1769 {
destinyXfate 2:0e2ef1edf01b 1770 png_ptr->up_row = (png_bytep )png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 1771 (png_ptr->rowbytes + 1));
destinyXfate 2:0e2ef1edf01b 1772 png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
destinyXfate 2:0e2ef1edf01b 1773 }
destinyXfate 2:0e2ef1edf01b 1774
destinyXfate 2:0e2ef1edf01b 1775 if (png_ptr->do_filter & PNG_FILTER_AVG)
destinyXfate 2:0e2ef1edf01b 1776 {
destinyXfate 2:0e2ef1edf01b 1777 png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 1778 (png_ptr->rowbytes + 1));
destinyXfate 2:0e2ef1edf01b 1779 png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
destinyXfate 2:0e2ef1edf01b 1780 }
destinyXfate 2:0e2ef1edf01b 1781
destinyXfate 2:0e2ef1edf01b 1782 if (png_ptr->do_filter & PNG_FILTER_PAETH)
destinyXfate 2:0e2ef1edf01b 1783 {
destinyXfate 2:0e2ef1edf01b 1784 png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
destinyXfate 2:0e2ef1edf01b 1785 (png_ptr->rowbytes + 1));
destinyXfate 2:0e2ef1edf01b 1786 png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
destinyXfate 2:0e2ef1edf01b 1787 }
destinyXfate 2:0e2ef1edf01b 1788 }
destinyXfate 2:0e2ef1edf01b 1789
destinyXfate 2:0e2ef1edf01b 1790 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
destinyXfate 2:0e2ef1edf01b 1791 /* if interlaced, we need to set up width and height of pass */
destinyXfate 2:0e2ef1edf01b 1792 if (png_ptr->interlaced)
destinyXfate 2:0e2ef1edf01b 1793 {
destinyXfate 2:0e2ef1edf01b 1794 if (!(png_ptr->transformations & PNG_INTERLACE))
destinyXfate 2:0e2ef1edf01b 1795 {
destinyXfate 2:0e2ef1edf01b 1796 png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
destinyXfate 2:0e2ef1edf01b 1797 png_pass_ystart[0]) / png_pass_yinc[0];
destinyXfate 2:0e2ef1edf01b 1798 png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 -
destinyXfate 2:0e2ef1edf01b 1799 png_pass_start[0]) / png_pass_inc[0];
destinyXfate 2:0e2ef1edf01b 1800 }
destinyXfate 2:0e2ef1edf01b 1801 else
destinyXfate 2:0e2ef1edf01b 1802 {
destinyXfate 2:0e2ef1edf01b 1803 png_ptr->num_rows = png_ptr->height;
destinyXfate 2:0e2ef1edf01b 1804 png_ptr->usr_width = png_ptr->width;
destinyXfate 2:0e2ef1edf01b 1805 }
destinyXfate 2:0e2ef1edf01b 1806 }
destinyXfate 2:0e2ef1edf01b 1807 else
destinyXfate 2:0e2ef1edf01b 1808 #endif
destinyXfate 2:0e2ef1edf01b 1809 {
destinyXfate 2:0e2ef1edf01b 1810 png_ptr->num_rows = png_ptr->height;
destinyXfate 2:0e2ef1edf01b 1811 png_ptr->usr_width = png_ptr->width;
destinyXfate 2:0e2ef1edf01b 1812 }
destinyXfate 2:0e2ef1edf01b 1813 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
destinyXfate 2:0e2ef1edf01b 1814 png_ptr->zstream.next_out = png_ptr->zbuf;
destinyXfate 2:0e2ef1edf01b 1815 }
destinyXfate 2:0e2ef1edf01b 1816
destinyXfate 2:0e2ef1edf01b 1817 /* Internal use only. Called when finished processing a row of data. */
destinyXfate 2:0e2ef1edf01b 1818 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1819 png_write_finish_row(png_structp png_ptr)
destinyXfate 2:0e2ef1edf01b 1820 {
destinyXfate 2:0e2ef1edf01b 1821 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1822 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
destinyXfate 2:0e2ef1edf01b 1823
destinyXfate 2:0e2ef1edf01b 1824 /* start of interlace block */
destinyXfate 2:0e2ef1edf01b 1825 int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
destinyXfate 2:0e2ef1edf01b 1826
destinyXfate 2:0e2ef1edf01b 1827 /* offset to next interlace block */
destinyXfate 2:0e2ef1edf01b 1828 int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
destinyXfate 2:0e2ef1edf01b 1829
destinyXfate 2:0e2ef1edf01b 1830 /* start of interlace block in the y direction */
destinyXfate 2:0e2ef1edf01b 1831 int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
destinyXfate 2:0e2ef1edf01b 1832
destinyXfate 2:0e2ef1edf01b 1833 /* offset to next interlace block in the y direction */
destinyXfate 2:0e2ef1edf01b 1834 int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
destinyXfate 2:0e2ef1edf01b 1835 #endif
destinyXfate 2:0e2ef1edf01b 1836
destinyXfate 2:0e2ef1edf01b 1837 int ret;
destinyXfate 2:0e2ef1edf01b 1838
destinyXfate 2:0e2ef1edf01b 1839 png_debug(1, "in png_write_finish_row\n");
destinyXfate 2:0e2ef1edf01b 1840 /* next row */
destinyXfate 2:0e2ef1edf01b 1841 png_ptr->row_number++;
destinyXfate 2:0e2ef1edf01b 1842
destinyXfate 2:0e2ef1edf01b 1843 /* see if we are done */
destinyXfate 2:0e2ef1edf01b 1844 if (png_ptr->row_number < png_ptr->num_rows)
destinyXfate 2:0e2ef1edf01b 1845 return;
destinyXfate 2:0e2ef1edf01b 1846
destinyXfate 2:0e2ef1edf01b 1847 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
destinyXfate 2:0e2ef1edf01b 1848 /* if interlaced, go to next pass */
destinyXfate 2:0e2ef1edf01b 1849 if (png_ptr->interlaced)
destinyXfate 2:0e2ef1edf01b 1850 {
destinyXfate 2:0e2ef1edf01b 1851 png_ptr->row_number = 0;
destinyXfate 2:0e2ef1edf01b 1852 if (png_ptr->transformations & PNG_INTERLACE)
destinyXfate 2:0e2ef1edf01b 1853 {
destinyXfate 2:0e2ef1edf01b 1854 png_ptr->pass++;
destinyXfate 2:0e2ef1edf01b 1855 }
destinyXfate 2:0e2ef1edf01b 1856 else
destinyXfate 2:0e2ef1edf01b 1857 {
destinyXfate 2:0e2ef1edf01b 1858 /* loop until we find a non-zero width or height pass */
destinyXfate 2:0e2ef1edf01b 1859 do
destinyXfate 2:0e2ef1edf01b 1860 {
destinyXfate 2:0e2ef1edf01b 1861 png_ptr->pass++;
destinyXfate 2:0e2ef1edf01b 1862 if (png_ptr->pass >= 7)
destinyXfate 2:0e2ef1edf01b 1863 break;
destinyXfate 2:0e2ef1edf01b 1864 png_ptr->usr_width = (png_ptr->width +
destinyXfate 2:0e2ef1edf01b 1865 png_pass_inc[png_ptr->pass] - 1 -
destinyXfate 2:0e2ef1edf01b 1866 png_pass_start[png_ptr->pass]) /
destinyXfate 2:0e2ef1edf01b 1867 png_pass_inc[png_ptr->pass];
destinyXfate 2:0e2ef1edf01b 1868 png_ptr->num_rows = (png_ptr->height +
destinyXfate 2:0e2ef1edf01b 1869 png_pass_yinc[png_ptr->pass] - 1 -
destinyXfate 2:0e2ef1edf01b 1870 png_pass_ystart[png_ptr->pass]) /
destinyXfate 2:0e2ef1edf01b 1871 png_pass_yinc[png_ptr->pass];
destinyXfate 2:0e2ef1edf01b 1872 if (png_ptr->transformations & PNG_INTERLACE)
destinyXfate 2:0e2ef1edf01b 1873 break;
destinyXfate 2:0e2ef1edf01b 1874 } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0);
destinyXfate 2:0e2ef1edf01b 1875
destinyXfate 2:0e2ef1edf01b 1876 }
destinyXfate 2:0e2ef1edf01b 1877
destinyXfate 2:0e2ef1edf01b 1878 /* reset the row above the image for the next pass */
destinyXfate 2:0e2ef1edf01b 1879 if (png_ptr->pass < 7)
destinyXfate 2:0e2ef1edf01b 1880 {
destinyXfate 2:0e2ef1edf01b 1881 if (png_ptr->prev_row != NULL)
destinyXfate 2:0e2ef1edf01b 1882 png_memset(png_ptr->prev_row, 0,
destinyXfate 2:0e2ef1edf01b 1883 (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels*
destinyXfate 2:0e2ef1edf01b 1884 png_ptr->usr_bit_depth,png_ptr->width))+1);
destinyXfate 2:0e2ef1edf01b 1885 return;
destinyXfate 2:0e2ef1edf01b 1886 }
destinyXfate 2:0e2ef1edf01b 1887 }
destinyXfate 2:0e2ef1edf01b 1888 #endif
destinyXfate 2:0e2ef1edf01b 1889
destinyXfate 2:0e2ef1edf01b 1890 /* if we get here, we've just written the last row, so we need
destinyXfate 2:0e2ef1edf01b 1891 to flush the compressor */
destinyXfate 2:0e2ef1edf01b 1892 do
destinyXfate 2:0e2ef1edf01b 1893 {
destinyXfate 2:0e2ef1edf01b 1894 /* tell the compressor we are done */
destinyXfate 2:0e2ef1edf01b 1895 ret = deflate(&png_ptr->zstream, Z_FINISH);
destinyXfate 2:0e2ef1edf01b 1896 /* check for an error */
destinyXfate 2:0e2ef1edf01b 1897 if (ret == Z_OK)
destinyXfate 2:0e2ef1edf01b 1898 {
destinyXfate 2:0e2ef1edf01b 1899 /* check to see if we need more room */
destinyXfate 2:0e2ef1edf01b 1900 if (!(png_ptr->zstream.avail_out))
destinyXfate 2:0e2ef1edf01b 1901 {
destinyXfate 2:0e2ef1edf01b 1902 png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
destinyXfate 2:0e2ef1edf01b 1903 png_ptr->zstream.next_out = png_ptr->zbuf;
destinyXfate 2:0e2ef1edf01b 1904 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
destinyXfate 2:0e2ef1edf01b 1905 }
destinyXfate 2:0e2ef1edf01b 1906 }
destinyXfate 2:0e2ef1edf01b 1907 else if (ret != Z_STREAM_END)
destinyXfate 2:0e2ef1edf01b 1908 {
destinyXfate 2:0e2ef1edf01b 1909 if (png_ptr->zstream.msg != NULL)
destinyXfate 2:0e2ef1edf01b 1910 png_error(png_ptr, png_ptr->zstream.msg);
destinyXfate 2:0e2ef1edf01b 1911 else
destinyXfate 2:0e2ef1edf01b 1912 png_error(png_ptr, "zlib error");
destinyXfate 2:0e2ef1edf01b 1913 }
destinyXfate 2:0e2ef1edf01b 1914 } while (ret != Z_STREAM_END);
destinyXfate 2:0e2ef1edf01b 1915
destinyXfate 2:0e2ef1edf01b 1916 /* write any extra space */
destinyXfate 2:0e2ef1edf01b 1917 if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
destinyXfate 2:0e2ef1edf01b 1918 {
destinyXfate 2:0e2ef1edf01b 1919 png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size -
destinyXfate 2:0e2ef1edf01b 1920 png_ptr->zstream.avail_out);
destinyXfate 2:0e2ef1edf01b 1921 }
destinyXfate 2:0e2ef1edf01b 1922
destinyXfate 2:0e2ef1edf01b 1923 deflateReset(&png_ptr->zstream);
destinyXfate 2:0e2ef1edf01b 1924 png_ptr->zstream.data_type = Z_BINARY;
destinyXfate 2:0e2ef1edf01b 1925 }
destinyXfate 2:0e2ef1edf01b 1926
destinyXfate 2:0e2ef1edf01b 1927 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1928 /* Pick out the correct pixels for the interlace pass.
destinyXfate 2:0e2ef1edf01b 1929 * The basic idea here is to go through the row with a source
destinyXfate 2:0e2ef1edf01b 1930 * pointer and a destination pointer (sp and dp), and copy the
destinyXfate 2:0e2ef1edf01b 1931 * correct pixels for the pass. As the row gets compacted,
destinyXfate 2:0e2ef1edf01b 1932 * sp will always be >= dp, so we should never overwrite anything.
destinyXfate 2:0e2ef1edf01b 1933 * See the default: case for the easiest code to understand.
destinyXfate 2:0e2ef1edf01b 1934 */
destinyXfate 2:0e2ef1edf01b 1935 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 1936 png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
destinyXfate 2:0e2ef1edf01b 1937 {
destinyXfate 2:0e2ef1edf01b 1938 #ifdef PNG_USE_LOCAL_ARRAYS
destinyXfate 2:0e2ef1edf01b 1939 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
destinyXfate 2:0e2ef1edf01b 1940
destinyXfate 2:0e2ef1edf01b 1941 /* start of interlace block */
destinyXfate 2:0e2ef1edf01b 1942 int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
destinyXfate 2:0e2ef1edf01b 1943
destinyXfate 2:0e2ef1edf01b 1944 /* offset to next interlace block */
destinyXfate 2:0e2ef1edf01b 1945 int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
destinyXfate 2:0e2ef1edf01b 1946 #endif
destinyXfate 2:0e2ef1edf01b 1947
destinyXfate 2:0e2ef1edf01b 1948 png_debug(1, "in png_do_write_interlace\n");
destinyXfate 2:0e2ef1edf01b 1949 /* we don't have to do anything on the last pass (6) */
destinyXfate 2:0e2ef1edf01b 1950 #if defined(PNG_USELESS_TESTS_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 1951 if (row != NULL && row_info != NULL && pass < 6)
destinyXfate 2:0e2ef1edf01b 1952 #else
destinyXfate 2:0e2ef1edf01b 1953 if (pass < 6)
destinyXfate 2:0e2ef1edf01b 1954 #endif
destinyXfate 2:0e2ef1edf01b 1955 {
destinyXfate 2:0e2ef1edf01b 1956 /* each pixel depth is handled separately */
destinyXfate 2:0e2ef1edf01b 1957 switch (row_info->pixel_depth)
destinyXfate 2:0e2ef1edf01b 1958 {
destinyXfate 2:0e2ef1edf01b 1959 case 1:
destinyXfate 2:0e2ef1edf01b 1960 {
destinyXfate 2:0e2ef1edf01b 1961 png_bytep sp;
destinyXfate 2:0e2ef1edf01b 1962 png_bytep dp;
destinyXfate 2:0e2ef1edf01b 1963 int shift;
destinyXfate 2:0e2ef1edf01b 1964 int d;
destinyXfate 2:0e2ef1edf01b 1965 int value;
destinyXfate 2:0e2ef1edf01b 1966 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 1967 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 1968
destinyXfate 2:0e2ef1edf01b 1969 dp = row;
destinyXfate 2:0e2ef1edf01b 1970 d = 0;
destinyXfate 2:0e2ef1edf01b 1971 shift = 7;
destinyXfate 2:0e2ef1edf01b 1972 for (i = png_pass_start[pass]; i < row_width;
destinyXfate 2:0e2ef1edf01b 1973 i += png_pass_inc[pass])
destinyXfate 2:0e2ef1edf01b 1974 {
destinyXfate 2:0e2ef1edf01b 1975 sp = row + (png_size_t)(i >> 3);
destinyXfate 2:0e2ef1edf01b 1976 value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;
destinyXfate 2:0e2ef1edf01b 1977 d |= (value << shift);
destinyXfate 2:0e2ef1edf01b 1978
destinyXfate 2:0e2ef1edf01b 1979 if (shift == 0)
destinyXfate 2:0e2ef1edf01b 1980 {
destinyXfate 2:0e2ef1edf01b 1981 shift = 7;
destinyXfate 2:0e2ef1edf01b 1982 *dp++ = (png_byte)d;
destinyXfate 2:0e2ef1edf01b 1983 d = 0;
destinyXfate 2:0e2ef1edf01b 1984 }
destinyXfate 2:0e2ef1edf01b 1985 else
destinyXfate 2:0e2ef1edf01b 1986 shift--;
destinyXfate 2:0e2ef1edf01b 1987
destinyXfate 2:0e2ef1edf01b 1988 }
destinyXfate 2:0e2ef1edf01b 1989 if (shift != 7)
destinyXfate 2:0e2ef1edf01b 1990 *dp = (png_byte)d;
destinyXfate 2:0e2ef1edf01b 1991 break;
destinyXfate 2:0e2ef1edf01b 1992 }
destinyXfate 2:0e2ef1edf01b 1993 case 2:
destinyXfate 2:0e2ef1edf01b 1994 {
destinyXfate 2:0e2ef1edf01b 1995 png_bytep sp;
destinyXfate 2:0e2ef1edf01b 1996 png_bytep dp;
destinyXfate 2:0e2ef1edf01b 1997 int shift;
destinyXfate 2:0e2ef1edf01b 1998 int d;
destinyXfate 2:0e2ef1edf01b 1999 int value;
destinyXfate 2:0e2ef1edf01b 2000 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2001 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 2002
destinyXfate 2:0e2ef1edf01b 2003 dp = row;
destinyXfate 2:0e2ef1edf01b 2004 shift = 6;
destinyXfate 2:0e2ef1edf01b 2005 d = 0;
destinyXfate 2:0e2ef1edf01b 2006 for (i = png_pass_start[pass]; i < row_width;
destinyXfate 2:0e2ef1edf01b 2007 i += png_pass_inc[pass])
destinyXfate 2:0e2ef1edf01b 2008 {
destinyXfate 2:0e2ef1edf01b 2009 sp = row + (png_size_t)(i >> 2);
destinyXfate 2:0e2ef1edf01b 2010 value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;
destinyXfate 2:0e2ef1edf01b 2011 d |= (value << shift);
destinyXfate 2:0e2ef1edf01b 2012
destinyXfate 2:0e2ef1edf01b 2013 if (shift == 0)
destinyXfate 2:0e2ef1edf01b 2014 {
destinyXfate 2:0e2ef1edf01b 2015 shift = 6;
destinyXfate 2:0e2ef1edf01b 2016 *dp++ = (png_byte)d;
destinyXfate 2:0e2ef1edf01b 2017 d = 0;
destinyXfate 2:0e2ef1edf01b 2018 }
destinyXfate 2:0e2ef1edf01b 2019 else
destinyXfate 2:0e2ef1edf01b 2020 shift -= 2;
destinyXfate 2:0e2ef1edf01b 2021 }
destinyXfate 2:0e2ef1edf01b 2022 if (shift != 6)
destinyXfate 2:0e2ef1edf01b 2023 *dp = (png_byte)d;
destinyXfate 2:0e2ef1edf01b 2024 break;
destinyXfate 2:0e2ef1edf01b 2025 }
destinyXfate 2:0e2ef1edf01b 2026 case 4:
destinyXfate 2:0e2ef1edf01b 2027 {
destinyXfate 2:0e2ef1edf01b 2028 png_bytep sp;
destinyXfate 2:0e2ef1edf01b 2029 png_bytep dp;
destinyXfate 2:0e2ef1edf01b 2030 int shift;
destinyXfate 2:0e2ef1edf01b 2031 int d;
destinyXfate 2:0e2ef1edf01b 2032 int value;
destinyXfate 2:0e2ef1edf01b 2033 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2034 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 2035
destinyXfate 2:0e2ef1edf01b 2036 dp = row;
destinyXfate 2:0e2ef1edf01b 2037 shift = 4;
destinyXfate 2:0e2ef1edf01b 2038 d = 0;
destinyXfate 2:0e2ef1edf01b 2039 for (i = png_pass_start[pass]; i < row_width;
destinyXfate 2:0e2ef1edf01b 2040 i += png_pass_inc[pass])
destinyXfate 2:0e2ef1edf01b 2041 {
destinyXfate 2:0e2ef1edf01b 2042 sp = row + (png_size_t)(i >> 1);
destinyXfate 2:0e2ef1edf01b 2043 value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;
destinyXfate 2:0e2ef1edf01b 2044 d |= (value << shift);
destinyXfate 2:0e2ef1edf01b 2045
destinyXfate 2:0e2ef1edf01b 2046 if (shift == 0)
destinyXfate 2:0e2ef1edf01b 2047 {
destinyXfate 2:0e2ef1edf01b 2048 shift = 4;
destinyXfate 2:0e2ef1edf01b 2049 *dp++ = (png_byte)d;
destinyXfate 2:0e2ef1edf01b 2050 d = 0;
destinyXfate 2:0e2ef1edf01b 2051 }
destinyXfate 2:0e2ef1edf01b 2052 else
destinyXfate 2:0e2ef1edf01b 2053 shift -= 4;
destinyXfate 2:0e2ef1edf01b 2054 }
destinyXfate 2:0e2ef1edf01b 2055 if (shift != 4)
destinyXfate 2:0e2ef1edf01b 2056 *dp = (png_byte)d;
destinyXfate 2:0e2ef1edf01b 2057 break;
destinyXfate 2:0e2ef1edf01b 2058 }
destinyXfate 2:0e2ef1edf01b 2059 default:
destinyXfate 2:0e2ef1edf01b 2060 {
destinyXfate 2:0e2ef1edf01b 2061 png_bytep sp;
destinyXfate 2:0e2ef1edf01b 2062 png_bytep dp;
destinyXfate 2:0e2ef1edf01b 2063 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2064 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 2065 png_size_t pixel_bytes;
destinyXfate 2:0e2ef1edf01b 2066
destinyXfate 2:0e2ef1edf01b 2067 /* start at the beginning */
destinyXfate 2:0e2ef1edf01b 2068 dp = row;
destinyXfate 2:0e2ef1edf01b 2069 /* find out how many bytes each pixel takes up */
destinyXfate 2:0e2ef1edf01b 2070 pixel_bytes = (row_info->pixel_depth >> 3);
destinyXfate 2:0e2ef1edf01b 2071 /* loop through the row, only looking at the pixels that
destinyXfate 2:0e2ef1edf01b 2072 matter */
destinyXfate 2:0e2ef1edf01b 2073 for (i = png_pass_start[pass]; i < row_width;
destinyXfate 2:0e2ef1edf01b 2074 i += png_pass_inc[pass])
destinyXfate 2:0e2ef1edf01b 2075 {
destinyXfate 2:0e2ef1edf01b 2076 /* find out where the original pixel is */
destinyXfate 2:0e2ef1edf01b 2077 sp = row + (png_size_t)i * pixel_bytes;
destinyXfate 2:0e2ef1edf01b 2078 /* move the pixel */
destinyXfate 2:0e2ef1edf01b 2079 if (dp != sp)
destinyXfate 2:0e2ef1edf01b 2080 png_memcpy(dp, sp, pixel_bytes);
destinyXfate 2:0e2ef1edf01b 2081 /* next pixel */
destinyXfate 2:0e2ef1edf01b 2082 dp += pixel_bytes;
destinyXfate 2:0e2ef1edf01b 2083 }
destinyXfate 2:0e2ef1edf01b 2084 break;
destinyXfate 2:0e2ef1edf01b 2085 }
destinyXfate 2:0e2ef1edf01b 2086 }
destinyXfate 2:0e2ef1edf01b 2087 /* set new row width */
destinyXfate 2:0e2ef1edf01b 2088 row_info->width = (row_info->width +
destinyXfate 2:0e2ef1edf01b 2089 png_pass_inc[pass] - 1 -
destinyXfate 2:0e2ef1edf01b 2090 png_pass_start[pass]) /
destinyXfate 2:0e2ef1edf01b 2091 png_pass_inc[pass];
destinyXfate 2:0e2ef1edf01b 2092 row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
destinyXfate 2:0e2ef1edf01b 2093 row_info->width);
destinyXfate 2:0e2ef1edf01b 2094 }
destinyXfate 2:0e2ef1edf01b 2095 }
destinyXfate 2:0e2ef1edf01b 2096 #endif
destinyXfate 2:0e2ef1edf01b 2097
destinyXfate 2:0e2ef1edf01b 2098 /* This filters the row, chooses which filter to use, if it has not already
destinyXfate 2:0e2ef1edf01b 2099 * been specified by the application, and then writes the row out with the
destinyXfate 2:0e2ef1edf01b 2100 * chosen filter.
destinyXfate 2:0e2ef1edf01b 2101 */
destinyXfate 2:0e2ef1edf01b 2102 #define PNG_MAXSUM (((png_uint_32)(-1)) >> 1)
destinyXfate 2:0e2ef1edf01b 2103 #define PNG_HISHIFT 10
destinyXfate 2:0e2ef1edf01b 2104 #define PNG_LOMASK ((png_uint_32)0xffffL)
destinyXfate 2:0e2ef1edf01b 2105 #define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT))
destinyXfate 2:0e2ef1edf01b 2106 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 2107 png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
destinyXfate 2:0e2ef1edf01b 2108 {
destinyXfate 2:0e2ef1edf01b 2109 png_bytep prev_row, best_row, row_buf;
destinyXfate 2:0e2ef1edf01b 2110 png_uint_32 mins, bpp;
destinyXfate 2:0e2ef1edf01b 2111 png_byte filter_to_do = png_ptr->do_filter;
destinyXfate 2:0e2ef1edf01b 2112 png_uint_32 row_bytes = row_info->rowbytes;
destinyXfate 2:0e2ef1edf01b 2113 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2114 int num_p_filters = (int)png_ptr->num_prev_filters;
destinyXfate 2:0e2ef1edf01b 2115 #endif
destinyXfate 2:0e2ef1edf01b 2116
destinyXfate 2:0e2ef1edf01b 2117 png_debug(1, "in png_write_find_filter\n");
destinyXfate 2:0e2ef1edf01b 2118 /* find out how many bytes offset each pixel is */
destinyXfate 2:0e2ef1edf01b 2119 bpp = (row_info->pixel_depth + 7) >> 3;
destinyXfate 2:0e2ef1edf01b 2120
destinyXfate 2:0e2ef1edf01b 2121 prev_row = png_ptr->prev_row;
destinyXfate 2:0e2ef1edf01b 2122 best_row = row_buf = png_ptr->row_buf;
destinyXfate 2:0e2ef1edf01b 2123 mins = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2124
destinyXfate 2:0e2ef1edf01b 2125 /* The prediction method we use is to find which method provides the
destinyXfate 2:0e2ef1edf01b 2126 * smallest value when summing the absolute values of the distances
destinyXfate 2:0e2ef1edf01b 2127 * from zero, using anything >= 128 as negative numbers. This is known
destinyXfate 2:0e2ef1edf01b 2128 * as the "minimum sum of absolute differences" heuristic. Other
destinyXfate 2:0e2ef1edf01b 2129 * heuristics are the "weighted minimum sum of absolute differences"
destinyXfate 2:0e2ef1edf01b 2130 * (experimental and can in theory improve compression), and the "zlib
destinyXfate 2:0e2ef1edf01b 2131 * predictive" method (not implemented yet), which does test compressions
destinyXfate 2:0e2ef1edf01b 2132 * of lines using different filter methods, and then chooses the
destinyXfate 2:0e2ef1edf01b 2133 * (series of) filter(s) that give minimum compressed data size (VERY
destinyXfate 2:0e2ef1edf01b 2134 * computationally expensive).
destinyXfate 2:0e2ef1edf01b 2135 *
destinyXfate 2:0e2ef1edf01b 2136 * GRR 980525: consider also
destinyXfate 2:0e2ef1edf01b 2137 * (1) minimum sum of absolute differences from running average (i.e.,
destinyXfate 2:0e2ef1edf01b 2138 * keep running sum of non-absolute differences & count of bytes)
destinyXfate 2:0e2ef1edf01b 2139 * [track dispersion, too? restart average if dispersion too large?]
destinyXfate 2:0e2ef1edf01b 2140 * (1b) minimum sum of absolute differences from sliding average, probably
destinyXfate 2:0e2ef1edf01b 2141 * with window size <= deflate window (usually 32K)
destinyXfate 2:0e2ef1edf01b 2142 * (2) minimum sum of squared differences from zero or running average
destinyXfate 2:0e2ef1edf01b 2143 * (i.e., ~ root-mean-square approach)
destinyXfate 2:0e2ef1edf01b 2144 */
destinyXfate 2:0e2ef1edf01b 2145
destinyXfate 2:0e2ef1edf01b 2146
destinyXfate 2:0e2ef1edf01b 2147 /* We don't need to test the 'no filter' case if this is the only filter
destinyXfate 2:0e2ef1edf01b 2148 * that has been chosen, as it doesn't actually do anything to the data.
destinyXfate 2:0e2ef1edf01b 2149 */
destinyXfate 2:0e2ef1edf01b 2150 if ((filter_to_do & PNG_FILTER_NONE) &&
destinyXfate 2:0e2ef1edf01b 2151 filter_to_do != PNG_FILTER_NONE)
destinyXfate 2:0e2ef1edf01b 2152 {
destinyXfate 2:0e2ef1edf01b 2153 png_bytep rp;
destinyXfate 2:0e2ef1edf01b 2154 png_uint_32 sum = 0;
destinyXfate 2:0e2ef1edf01b 2155 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2156 int v;
destinyXfate 2:0e2ef1edf01b 2157
destinyXfate 2:0e2ef1edf01b 2158 for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
destinyXfate 2:0e2ef1edf01b 2159 {
destinyXfate 2:0e2ef1edf01b 2160 v = *rp;
destinyXfate 2:0e2ef1edf01b 2161 sum += (v < 128) ? v : 256 - v;
destinyXfate 2:0e2ef1edf01b 2162 }
destinyXfate 2:0e2ef1edf01b 2163
destinyXfate 2:0e2ef1edf01b 2164 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2165 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2166 {
destinyXfate 2:0e2ef1edf01b 2167 png_uint_32 sumhi, sumlo;
destinyXfate 2:0e2ef1edf01b 2168 int j;
destinyXfate 2:0e2ef1edf01b 2169 sumlo = sum & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2170 sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */
destinyXfate 2:0e2ef1edf01b 2171
destinyXfate 2:0e2ef1edf01b 2172 /* Reduce the sum if we match any of the previous rows */
destinyXfate 2:0e2ef1edf01b 2173 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2174 {
destinyXfate 2:0e2ef1edf01b 2175 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
destinyXfate 2:0e2ef1edf01b 2176 {
destinyXfate 2:0e2ef1edf01b 2177 sumlo = (sumlo * png_ptr->filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2178 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2179 sumhi = (sumhi * png_ptr->filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2180 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2181 }
destinyXfate 2:0e2ef1edf01b 2182 }
destinyXfate 2:0e2ef1edf01b 2183
destinyXfate 2:0e2ef1edf01b 2184 /* Factor in the cost of this filter (this is here for completeness,
destinyXfate 2:0e2ef1edf01b 2185 * but it makes no sense to have a "cost" for the NONE filter, as
destinyXfate 2:0e2ef1edf01b 2186 * it has the minimum possible computational cost - none).
destinyXfate 2:0e2ef1edf01b 2187 */
destinyXfate 2:0e2ef1edf01b 2188 sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >>
destinyXfate 2:0e2ef1edf01b 2189 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2190 sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >>
destinyXfate 2:0e2ef1edf01b 2191 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2192
destinyXfate 2:0e2ef1edf01b 2193 if (sumhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2194 sum = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2195 else
destinyXfate 2:0e2ef1edf01b 2196 sum = (sumhi << PNG_HISHIFT) + sumlo;
destinyXfate 2:0e2ef1edf01b 2197 }
destinyXfate 2:0e2ef1edf01b 2198 #endif
destinyXfate 2:0e2ef1edf01b 2199 mins = sum;
destinyXfate 2:0e2ef1edf01b 2200 }
destinyXfate 2:0e2ef1edf01b 2201
destinyXfate 2:0e2ef1edf01b 2202 /* sub filter */
destinyXfate 2:0e2ef1edf01b 2203 if (filter_to_do == PNG_FILTER_SUB)
destinyXfate 2:0e2ef1edf01b 2204 /* it's the only filter so no testing is needed */
destinyXfate 2:0e2ef1edf01b 2205 {
destinyXfate 2:0e2ef1edf01b 2206 png_bytep rp, lp, dp;
destinyXfate 2:0e2ef1edf01b 2207 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2208 for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
destinyXfate 2:0e2ef1edf01b 2209 i++, rp++, dp++)
destinyXfate 2:0e2ef1edf01b 2210 {
destinyXfate 2:0e2ef1edf01b 2211 *dp = *rp;
destinyXfate 2:0e2ef1edf01b 2212 }
destinyXfate 2:0e2ef1edf01b 2213 for (lp = row_buf + 1; i < row_bytes;
destinyXfate 2:0e2ef1edf01b 2214 i++, rp++, lp++, dp++)
destinyXfate 2:0e2ef1edf01b 2215 {
destinyXfate 2:0e2ef1edf01b 2216 *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
destinyXfate 2:0e2ef1edf01b 2217 }
destinyXfate 2:0e2ef1edf01b 2218 best_row = png_ptr->sub_row;
destinyXfate 2:0e2ef1edf01b 2219 }
destinyXfate 2:0e2ef1edf01b 2220
destinyXfate 2:0e2ef1edf01b 2221 else if (filter_to_do & PNG_FILTER_SUB)
destinyXfate 2:0e2ef1edf01b 2222 {
destinyXfate 2:0e2ef1edf01b 2223 png_bytep rp, dp, lp;
destinyXfate 2:0e2ef1edf01b 2224 png_uint_32 sum = 0, lmins = mins;
destinyXfate 2:0e2ef1edf01b 2225 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2226 int v;
destinyXfate 2:0e2ef1edf01b 2227
destinyXfate 2:0e2ef1edf01b 2228 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2229 /* We temporarily increase the "minimum sum" by the factor we
destinyXfate 2:0e2ef1edf01b 2230 * would reduce the sum of this filter, so that we can do the
destinyXfate 2:0e2ef1edf01b 2231 * early exit comparison without scaling the sum each time.
destinyXfate 2:0e2ef1edf01b 2232 */
destinyXfate 2:0e2ef1edf01b 2233 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2234 {
destinyXfate 2:0e2ef1edf01b 2235 int j;
destinyXfate 2:0e2ef1edf01b 2236 png_uint_32 lmhi, lmlo;
destinyXfate 2:0e2ef1edf01b 2237 lmlo = lmins & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2238 lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
destinyXfate 2:0e2ef1edf01b 2239
destinyXfate 2:0e2ef1edf01b 2240 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2241 {
destinyXfate 2:0e2ef1edf01b 2242 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
destinyXfate 2:0e2ef1edf01b 2243 {
destinyXfate 2:0e2ef1edf01b 2244 lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2245 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2246 lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2247 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2248 }
destinyXfate 2:0e2ef1edf01b 2249 }
destinyXfate 2:0e2ef1edf01b 2250
destinyXfate 2:0e2ef1edf01b 2251 lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
destinyXfate 2:0e2ef1edf01b 2252 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2253 lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
destinyXfate 2:0e2ef1edf01b 2254 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2255
destinyXfate 2:0e2ef1edf01b 2256 if (lmhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2257 lmins = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2258 else
destinyXfate 2:0e2ef1edf01b 2259 lmins = (lmhi << PNG_HISHIFT) + lmlo;
destinyXfate 2:0e2ef1edf01b 2260 }
destinyXfate 2:0e2ef1edf01b 2261 #endif
destinyXfate 2:0e2ef1edf01b 2262
destinyXfate 2:0e2ef1edf01b 2263 for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
destinyXfate 2:0e2ef1edf01b 2264 i++, rp++, dp++)
destinyXfate 2:0e2ef1edf01b 2265 {
destinyXfate 2:0e2ef1edf01b 2266 v = *dp = *rp;
destinyXfate 2:0e2ef1edf01b 2267
destinyXfate 2:0e2ef1edf01b 2268 sum += (v < 128) ? v : 256 - v;
destinyXfate 2:0e2ef1edf01b 2269 }
destinyXfate 2:0e2ef1edf01b 2270 for (lp = row_buf + 1; i < row_bytes;
destinyXfate 2:0e2ef1edf01b 2271 i++, rp++, lp++, dp++)
destinyXfate 2:0e2ef1edf01b 2272 {
destinyXfate 2:0e2ef1edf01b 2273 v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
destinyXfate 2:0e2ef1edf01b 2274
destinyXfate 2:0e2ef1edf01b 2275 sum += (v < 128) ? v : 256 - v;
destinyXfate 2:0e2ef1edf01b 2276
destinyXfate 2:0e2ef1edf01b 2277 if (sum > lmins) /* We are already worse, don't continue. */
destinyXfate 2:0e2ef1edf01b 2278 break;
destinyXfate 2:0e2ef1edf01b 2279 }
destinyXfate 2:0e2ef1edf01b 2280
destinyXfate 2:0e2ef1edf01b 2281 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2282 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2283 {
destinyXfate 2:0e2ef1edf01b 2284 int j;
destinyXfate 2:0e2ef1edf01b 2285 png_uint_32 sumhi, sumlo;
destinyXfate 2:0e2ef1edf01b 2286 sumlo = sum & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2287 sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
destinyXfate 2:0e2ef1edf01b 2288
destinyXfate 2:0e2ef1edf01b 2289 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2290 {
destinyXfate 2:0e2ef1edf01b 2291 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
destinyXfate 2:0e2ef1edf01b 2292 {
destinyXfate 2:0e2ef1edf01b 2293 sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2294 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2295 sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2296 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2297 }
destinyXfate 2:0e2ef1edf01b 2298 }
destinyXfate 2:0e2ef1edf01b 2299
destinyXfate 2:0e2ef1edf01b 2300 sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
destinyXfate 2:0e2ef1edf01b 2301 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2302 sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>
destinyXfate 2:0e2ef1edf01b 2303 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2304
destinyXfate 2:0e2ef1edf01b 2305 if (sumhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2306 sum = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2307 else
destinyXfate 2:0e2ef1edf01b 2308 sum = (sumhi << PNG_HISHIFT) + sumlo;
destinyXfate 2:0e2ef1edf01b 2309 }
destinyXfate 2:0e2ef1edf01b 2310 #endif
destinyXfate 2:0e2ef1edf01b 2311
destinyXfate 2:0e2ef1edf01b 2312 if (sum < mins)
destinyXfate 2:0e2ef1edf01b 2313 {
destinyXfate 2:0e2ef1edf01b 2314 mins = sum;
destinyXfate 2:0e2ef1edf01b 2315 best_row = png_ptr->sub_row;
destinyXfate 2:0e2ef1edf01b 2316 }
destinyXfate 2:0e2ef1edf01b 2317 }
destinyXfate 2:0e2ef1edf01b 2318
destinyXfate 2:0e2ef1edf01b 2319 /* up filter */
destinyXfate 2:0e2ef1edf01b 2320 if (filter_to_do == PNG_FILTER_UP)
destinyXfate 2:0e2ef1edf01b 2321 {
destinyXfate 2:0e2ef1edf01b 2322 png_bytep rp, dp, pp;
destinyXfate 2:0e2ef1edf01b 2323 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2324
destinyXfate 2:0e2ef1edf01b 2325 for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
destinyXfate 2:0e2ef1edf01b 2326 pp = prev_row + 1; i < row_bytes;
destinyXfate 2:0e2ef1edf01b 2327 i++, rp++, pp++, dp++)
destinyXfate 2:0e2ef1edf01b 2328 {
destinyXfate 2:0e2ef1edf01b 2329 *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
destinyXfate 2:0e2ef1edf01b 2330 }
destinyXfate 2:0e2ef1edf01b 2331 best_row = png_ptr->up_row;
destinyXfate 2:0e2ef1edf01b 2332 }
destinyXfate 2:0e2ef1edf01b 2333
destinyXfate 2:0e2ef1edf01b 2334 else if (filter_to_do & PNG_FILTER_UP)
destinyXfate 2:0e2ef1edf01b 2335 {
destinyXfate 2:0e2ef1edf01b 2336 png_bytep rp, dp, pp;
destinyXfate 2:0e2ef1edf01b 2337 png_uint_32 sum = 0, lmins = mins;
destinyXfate 2:0e2ef1edf01b 2338 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2339 int v;
destinyXfate 2:0e2ef1edf01b 2340
destinyXfate 2:0e2ef1edf01b 2341
destinyXfate 2:0e2ef1edf01b 2342 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2343 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2344 {
destinyXfate 2:0e2ef1edf01b 2345 int j;
destinyXfate 2:0e2ef1edf01b 2346 png_uint_32 lmhi, lmlo;
destinyXfate 2:0e2ef1edf01b 2347 lmlo = lmins & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2348 lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
destinyXfate 2:0e2ef1edf01b 2349
destinyXfate 2:0e2ef1edf01b 2350 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2351 {
destinyXfate 2:0e2ef1edf01b 2352 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
destinyXfate 2:0e2ef1edf01b 2353 {
destinyXfate 2:0e2ef1edf01b 2354 lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2355 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2356 lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2357 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2358 }
destinyXfate 2:0e2ef1edf01b 2359 }
destinyXfate 2:0e2ef1edf01b 2360
destinyXfate 2:0e2ef1edf01b 2361 lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >>
destinyXfate 2:0e2ef1edf01b 2362 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2363 lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >>
destinyXfate 2:0e2ef1edf01b 2364 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2365
destinyXfate 2:0e2ef1edf01b 2366 if (lmhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2367 lmins = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2368 else
destinyXfate 2:0e2ef1edf01b 2369 lmins = (lmhi << PNG_HISHIFT) + lmlo;
destinyXfate 2:0e2ef1edf01b 2370 }
destinyXfate 2:0e2ef1edf01b 2371 #endif
destinyXfate 2:0e2ef1edf01b 2372
destinyXfate 2:0e2ef1edf01b 2373 for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
destinyXfate 2:0e2ef1edf01b 2374 pp = prev_row + 1; i < row_bytes; i++)
destinyXfate 2:0e2ef1edf01b 2375 {
destinyXfate 2:0e2ef1edf01b 2376 v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
destinyXfate 2:0e2ef1edf01b 2377
destinyXfate 2:0e2ef1edf01b 2378 sum += (v < 128) ? v : 256 - v;
destinyXfate 2:0e2ef1edf01b 2379
destinyXfate 2:0e2ef1edf01b 2380 if (sum > lmins) /* We are already worse, don't continue. */
destinyXfate 2:0e2ef1edf01b 2381 break;
destinyXfate 2:0e2ef1edf01b 2382 }
destinyXfate 2:0e2ef1edf01b 2383
destinyXfate 2:0e2ef1edf01b 2384 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2385 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2386 {
destinyXfate 2:0e2ef1edf01b 2387 int j;
destinyXfate 2:0e2ef1edf01b 2388 png_uint_32 sumhi, sumlo;
destinyXfate 2:0e2ef1edf01b 2389 sumlo = sum & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2390 sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
destinyXfate 2:0e2ef1edf01b 2391
destinyXfate 2:0e2ef1edf01b 2392 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2393 {
destinyXfate 2:0e2ef1edf01b 2394 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
destinyXfate 2:0e2ef1edf01b 2395 {
destinyXfate 2:0e2ef1edf01b 2396 sumlo = (sumlo * png_ptr->filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2397 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2398 sumhi = (sumhi * png_ptr->filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2399 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2400 }
destinyXfate 2:0e2ef1edf01b 2401 }
destinyXfate 2:0e2ef1edf01b 2402
destinyXfate 2:0e2ef1edf01b 2403 sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >>
destinyXfate 2:0e2ef1edf01b 2404 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2405 sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >>
destinyXfate 2:0e2ef1edf01b 2406 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2407
destinyXfate 2:0e2ef1edf01b 2408 if (sumhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2409 sum = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2410 else
destinyXfate 2:0e2ef1edf01b 2411 sum = (sumhi << PNG_HISHIFT) + sumlo;
destinyXfate 2:0e2ef1edf01b 2412 }
destinyXfate 2:0e2ef1edf01b 2413 #endif
destinyXfate 2:0e2ef1edf01b 2414
destinyXfate 2:0e2ef1edf01b 2415 if (sum < mins)
destinyXfate 2:0e2ef1edf01b 2416 {
destinyXfate 2:0e2ef1edf01b 2417 mins = sum;
destinyXfate 2:0e2ef1edf01b 2418 best_row = png_ptr->up_row;
destinyXfate 2:0e2ef1edf01b 2419 }
destinyXfate 2:0e2ef1edf01b 2420 }
destinyXfate 2:0e2ef1edf01b 2421
destinyXfate 2:0e2ef1edf01b 2422 /* avg filter */
destinyXfate 2:0e2ef1edf01b 2423 if (filter_to_do == PNG_FILTER_AVG)
destinyXfate 2:0e2ef1edf01b 2424 {
destinyXfate 2:0e2ef1edf01b 2425 png_bytep rp, dp, pp, lp;
destinyXfate 2:0e2ef1edf01b 2426 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2427 for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
destinyXfate 2:0e2ef1edf01b 2428 pp = prev_row + 1; i < bpp; i++)
destinyXfate 2:0e2ef1edf01b 2429 {
destinyXfate 2:0e2ef1edf01b 2430 *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
destinyXfate 2:0e2ef1edf01b 2431 }
destinyXfate 2:0e2ef1edf01b 2432 for (lp = row_buf + 1; i < row_bytes; i++)
destinyXfate 2:0e2ef1edf01b 2433 {
destinyXfate 2:0e2ef1edf01b 2434 *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
destinyXfate 2:0e2ef1edf01b 2435 & 0xff);
destinyXfate 2:0e2ef1edf01b 2436 }
destinyXfate 2:0e2ef1edf01b 2437 best_row = png_ptr->avg_row;
destinyXfate 2:0e2ef1edf01b 2438 }
destinyXfate 2:0e2ef1edf01b 2439
destinyXfate 2:0e2ef1edf01b 2440 else if (filter_to_do & PNG_FILTER_AVG)
destinyXfate 2:0e2ef1edf01b 2441 {
destinyXfate 2:0e2ef1edf01b 2442 png_bytep rp, dp, pp, lp;
destinyXfate 2:0e2ef1edf01b 2443 png_uint_32 sum = 0, lmins = mins;
destinyXfate 2:0e2ef1edf01b 2444 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2445 int v;
destinyXfate 2:0e2ef1edf01b 2446
destinyXfate 2:0e2ef1edf01b 2447 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2448 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2449 {
destinyXfate 2:0e2ef1edf01b 2450 int j;
destinyXfate 2:0e2ef1edf01b 2451 png_uint_32 lmhi, lmlo;
destinyXfate 2:0e2ef1edf01b 2452 lmlo = lmins & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2453 lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
destinyXfate 2:0e2ef1edf01b 2454
destinyXfate 2:0e2ef1edf01b 2455 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2456 {
destinyXfate 2:0e2ef1edf01b 2457 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG)
destinyXfate 2:0e2ef1edf01b 2458 {
destinyXfate 2:0e2ef1edf01b 2459 lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2460 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2461 lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2462 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2463 }
destinyXfate 2:0e2ef1edf01b 2464 }
destinyXfate 2:0e2ef1edf01b 2465
destinyXfate 2:0e2ef1edf01b 2466 lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >>
destinyXfate 2:0e2ef1edf01b 2467 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2468 lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >>
destinyXfate 2:0e2ef1edf01b 2469 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2470
destinyXfate 2:0e2ef1edf01b 2471 if (lmhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2472 lmins = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2473 else
destinyXfate 2:0e2ef1edf01b 2474 lmins = (lmhi << PNG_HISHIFT) + lmlo;
destinyXfate 2:0e2ef1edf01b 2475 }
destinyXfate 2:0e2ef1edf01b 2476 #endif
destinyXfate 2:0e2ef1edf01b 2477
destinyXfate 2:0e2ef1edf01b 2478 for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
destinyXfate 2:0e2ef1edf01b 2479 pp = prev_row + 1; i < bpp; i++)
destinyXfate 2:0e2ef1edf01b 2480 {
destinyXfate 2:0e2ef1edf01b 2481 v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
destinyXfate 2:0e2ef1edf01b 2482
destinyXfate 2:0e2ef1edf01b 2483 sum += (v < 128) ? v : 256 - v;
destinyXfate 2:0e2ef1edf01b 2484 }
destinyXfate 2:0e2ef1edf01b 2485 for (lp = row_buf + 1; i < row_bytes; i++)
destinyXfate 2:0e2ef1edf01b 2486 {
destinyXfate 2:0e2ef1edf01b 2487 v = *dp++ =
destinyXfate 2:0e2ef1edf01b 2488 (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff);
destinyXfate 2:0e2ef1edf01b 2489
destinyXfate 2:0e2ef1edf01b 2490 sum += (v < 128) ? v : 256 - v;
destinyXfate 2:0e2ef1edf01b 2491
destinyXfate 2:0e2ef1edf01b 2492 if (sum > lmins) /* We are already worse, don't continue. */
destinyXfate 2:0e2ef1edf01b 2493 break;
destinyXfate 2:0e2ef1edf01b 2494 }
destinyXfate 2:0e2ef1edf01b 2495
destinyXfate 2:0e2ef1edf01b 2496 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2497 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2498 {
destinyXfate 2:0e2ef1edf01b 2499 int j;
destinyXfate 2:0e2ef1edf01b 2500 png_uint_32 sumhi, sumlo;
destinyXfate 2:0e2ef1edf01b 2501 sumlo = sum & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2502 sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
destinyXfate 2:0e2ef1edf01b 2503
destinyXfate 2:0e2ef1edf01b 2504 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2505 {
destinyXfate 2:0e2ef1edf01b 2506 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
destinyXfate 2:0e2ef1edf01b 2507 {
destinyXfate 2:0e2ef1edf01b 2508 sumlo = (sumlo * png_ptr->filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2509 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2510 sumhi = (sumhi * png_ptr->filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2511 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2512 }
destinyXfate 2:0e2ef1edf01b 2513 }
destinyXfate 2:0e2ef1edf01b 2514
destinyXfate 2:0e2ef1edf01b 2515 sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >>
destinyXfate 2:0e2ef1edf01b 2516 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2517 sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >>
destinyXfate 2:0e2ef1edf01b 2518 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2519
destinyXfate 2:0e2ef1edf01b 2520 if (sumhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2521 sum = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2522 else
destinyXfate 2:0e2ef1edf01b 2523 sum = (sumhi << PNG_HISHIFT) + sumlo;
destinyXfate 2:0e2ef1edf01b 2524 }
destinyXfate 2:0e2ef1edf01b 2525 #endif
destinyXfate 2:0e2ef1edf01b 2526
destinyXfate 2:0e2ef1edf01b 2527 if (sum < mins)
destinyXfate 2:0e2ef1edf01b 2528 {
destinyXfate 2:0e2ef1edf01b 2529 mins = sum;
destinyXfate 2:0e2ef1edf01b 2530 best_row = png_ptr->avg_row;
destinyXfate 2:0e2ef1edf01b 2531 }
destinyXfate 2:0e2ef1edf01b 2532 }
destinyXfate 2:0e2ef1edf01b 2533
destinyXfate 2:0e2ef1edf01b 2534 /* Paeth filter */
destinyXfate 2:0e2ef1edf01b 2535 if (filter_to_do == PNG_FILTER_PAETH)
destinyXfate 2:0e2ef1edf01b 2536 {
destinyXfate 2:0e2ef1edf01b 2537 png_bytep rp, dp, pp, cp, lp;
destinyXfate 2:0e2ef1edf01b 2538 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2539 for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
destinyXfate 2:0e2ef1edf01b 2540 pp = prev_row + 1; i < bpp; i++)
destinyXfate 2:0e2ef1edf01b 2541 {
destinyXfate 2:0e2ef1edf01b 2542 *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
destinyXfate 2:0e2ef1edf01b 2543 }
destinyXfate 2:0e2ef1edf01b 2544
destinyXfate 2:0e2ef1edf01b 2545 for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
destinyXfate 2:0e2ef1edf01b 2546 {
destinyXfate 2:0e2ef1edf01b 2547 int a, b, c, pa, pb, pc, p;
destinyXfate 2:0e2ef1edf01b 2548
destinyXfate 2:0e2ef1edf01b 2549 b = *pp++;
destinyXfate 2:0e2ef1edf01b 2550 c = *cp++;
destinyXfate 2:0e2ef1edf01b 2551 a = *lp++;
destinyXfate 2:0e2ef1edf01b 2552
destinyXfate 2:0e2ef1edf01b 2553 p = b - c;
destinyXfate 2:0e2ef1edf01b 2554 pc = a - c;
destinyXfate 2:0e2ef1edf01b 2555
destinyXfate 2:0e2ef1edf01b 2556 #ifdef PNG_USE_ABS
destinyXfate 2:0e2ef1edf01b 2557 pa = abs(p);
destinyXfate 2:0e2ef1edf01b 2558 pb = abs(pc);
destinyXfate 2:0e2ef1edf01b 2559 pc = abs(p + pc);
destinyXfate 2:0e2ef1edf01b 2560 #else
destinyXfate 2:0e2ef1edf01b 2561 pa = p < 0 ? -p : p;
destinyXfate 2:0e2ef1edf01b 2562 pb = pc < 0 ? -pc : pc;
destinyXfate 2:0e2ef1edf01b 2563 pc = (p + pc) < 0 ? -(p + pc) : p + pc;
destinyXfate 2:0e2ef1edf01b 2564 #endif
destinyXfate 2:0e2ef1edf01b 2565
destinyXfate 2:0e2ef1edf01b 2566 p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
destinyXfate 2:0e2ef1edf01b 2567
destinyXfate 2:0e2ef1edf01b 2568 *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
destinyXfate 2:0e2ef1edf01b 2569 }
destinyXfate 2:0e2ef1edf01b 2570 best_row = png_ptr->paeth_row;
destinyXfate 2:0e2ef1edf01b 2571 }
destinyXfate 2:0e2ef1edf01b 2572
destinyXfate 2:0e2ef1edf01b 2573 else if (filter_to_do & PNG_FILTER_PAETH)
destinyXfate 2:0e2ef1edf01b 2574 {
destinyXfate 2:0e2ef1edf01b 2575 png_bytep rp, dp, pp, cp, lp;
destinyXfate 2:0e2ef1edf01b 2576 png_uint_32 sum = 0, lmins = mins;
destinyXfate 2:0e2ef1edf01b 2577 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 2578 int v;
destinyXfate 2:0e2ef1edf01b 2579
destinyXfate 2:0e2ef1edf01b 2580 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2581 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2582 {
destinyXfate 2:0e2ef1edf01b 2583 int j;
destinyXfate 2:0e2ef1edf01b 2584 png_uint_32 lmhi, lmlo;
destinyXfate 2:0e2ef1edf01b 2585 lmlo = lmins & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2586 lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
destinyXfate 2:0e2ef1edf01b 2587
destinyXfate 2:0e2ef1edf01b 2588 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2589 {
destinyXfate 2:0e2ef1edf01b 2590 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
destinyXfate 2:0e2ef1edf01b 2591 {
destinyXfate 2:0e2ef1edf01b 2592 lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2593 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2594 lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2595 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2596 }
destinyXfate 2:0e2ef1edf01b 2597 }
destinyXfate 2:0e2ef1edf01b 2598
destinyXfate 2:0e2ef1edf01b 2599 lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >>
destinyXfate 2:0e2ef1edf01b 2600 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2601 lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >>
destinyXfate 2:0e2ef1edf01b 2602 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2603
destinyXfate 2:0e2ef1edf01b 2604 if (lmhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2605 lmins = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2606 else
destinyXfate 2:0e2ef1edf01b 2607 lmins = (lmhi << PNG_HISHIFT) + lmlo;
destinyXfate 2:0e2ef1edf01b 2608 }
destinyXfate 2:0e2ef1edf01b 2609 #endif
destinyXfate 2:0e2ef1edf01b 2610
destinyXfate 2:0e2ef1edf01b 2611 for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
destinyXfate 2:0e2ef1edf01b 2612 pp = prev_row + 1; i < bpp; i++)
destinyXfate 2:0e2ef1edf01b 2613 {
destinyXfate 2:0e2ef1edf01b 2614 v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
destinyXfate 2:0e2ef1edf01b 2615
destinyXfate 2:0e2ef1edf01b 2616 sum += (v < 128) ? v : 256 - v;
destinyXfate 2:0e2ef1edf01b 2617 }
destinyXfate 2:0e2ef1edf01b 2618
destinyXfate 2:0e2ef1edf01b 2619 for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
destinyXfate 2:0e2ef1edf01b 2620 {
destinyXfate 2:0e2ef1edf01b 2621 int a, b, c, pa, pb, pc, p;
destinyXfate 2:0e2ef1edf01b 2622
destinyXfate 2:0e2ef1edf01b 2623 b = *pp++;
destinyXfate 2:0e2ef1edf01b 2624 c = *cp++;
destinyXfate 2:0e2ef1edf01b 2625 a = *lp++;
destinyXfate 2:0e2ef1edf01b 2626
destinyXfate 2:0e2ef1edf01b 2627 #ifndef PNG_SLOW_PAETH
destinyXfate 2:0e2ef1edf01b 2628 p = b - c;
destinyXfate 2:0e2ef1edf01b 2629 pc = a - c;
destinyXfate 2:0e2ef1edf01b 2630 #ifdef PNG_USE_ABS
destinyXfate 2:0e2ef1edf01b 2631 pa = abs(p);
destinyXfate 2:0e2ef1edf01b 2632 pb = abs(pc);
destinyXfate 2:0e2ef1edf01b 2633 pc = abs(p + pc);
destinyXfate 2:0e2ef1edf01b 2634 #else
destinyXfate 2:0e2ef1edf01b 2635 pa = p < 0 ? -p : p;
destinyXfate 2:0e2ef1edf01b 2636 pb = pc < 0 ? -pc : pc;
destinyXfate 2:0e2ef1edf01b 2637 pc = (p + pc) < 0 ? -(p + pc) : p + pc;
destinyXfate 2:0e2ef1edf01b 2638 #endif
destinyXfate 2:0e2ef1edf01b 2639 p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
destinyXfate 2:0e2ef1edf01b 2640 #else /* PNG_SLOW_PAETH */
destinyXfate 2:0e2ef1edf01b 2641 p = a + b - c;
destinyXfate 2:0e2ef1edf01b 2642 pa = abs(p - a);
destinyXfate 2:0e2ef1edf01b 2643 pb = abs(p - b);
destinyXfate 2:0e2ef1edf01b 2644 pc = abs(p - c);
destinyXfate 2:0e2ef1edf01b 2645 if (pa <= pb && pa <= pc)
destinyXfate 2:0e2ef1edf01b 2646 p = a;
destinyXfate 2:0e2ef1edf01b 2647 else if (pb <= pc)
destinyXfate 2:0e2ef1edf01b 2648 p = b;
destinyXfate 2:0e2ef1edf01b 2649 else
destinyXfate 2:0e2ef1edf01b 2650 p = c;
destinyXfate 2:0e2ef1edf01b 2651 #endif /* PNG_SLOW_PAETH */
destinyXfate 2:0e2ef1edf01b 2652
destinyXfate 2:0e2ef1edf01b 2653 v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
destinyXfate 2:0e2ef1edf01b 2654
destinyXfate 2:0e2ef1edf01b 2655 sum += (v < 128) ? v : 256 - v;
destinyXfate 2:0e2ef1edf01b 2656
destinyXfate 2:0e2ef1edf01b 2657 if (sum > lmins) /* We are already worse, don't continue. */
destinyXfate 2:0e2ef1edf01b 2658 break;
destinyXfate 2:0e2ef1edf01b 2659 }
destinyXfate 2:0e2ef1edf01b 2660
destinyXfate 2:0e2ef1edf01b 2661 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2662 if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
destinyXfate 2:0e2ef1edf01b 2663 {
destinyXfate 2:0e2ef1edf01b 2664 int j;
destinyXfate 2:0e2ef1edf01b 2665 png_uint_32 sumhi, sumlo;
destinyXfate 2:0e2ef1edf01b 2666 sumlo = sum & PNG_LOMASK;
destinyXfate 2:0e2ef1edf01b 2667 sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
destinyXfate 2:0e2ef1edf01b 2668
destinyXfate 2:0e2ef1edf01b 2669 for (j = 0; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2670 {
destinyXfate 2:0e2ef1edf01b 2671 if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
destinyXfate 2:0e2ef1edf01b 2672 {
destinyXfate 2:0e2ef1edf01b 2673 sumlo = (sumlo * png_ptr->filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2674 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2675 sumhi = (sumhi * png_ptr->filter_weights[j]) >>
destinyXfate 2:0e2ef1edf01b 2676 PNG_WEIGHT_SHIFT;
destinyXfate 2:0e2ef1edf01b 2677 }
destinyXfate 2:0e2ef1edf01b 2678 }
destinyXfate 2:0e2ef1edf01b 2679
destinyXfate 2:0e2ef1edf01b 2680 sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >>
destinyXfate 2:0e2ef1edf01b 2681 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2682 sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >>
destinyXfate 2:0e2ef1edf01b 2683 PNG_COST_SHIFT;
destinyXfate 2:0e2ef1edf01b 2684
destinyXfate 2:0e2ef1edf01b 2685 if (sumhi > PNG_HIMASK)
destinyXfate 2:0e2ef1edf01b 2686 sum = PNG_MAXSUM;
destinyXfate 2:0e2ef1edf01b 2687 else
destinyXfate 2:0e2ef1edf01b 2688 sum = (sumhi << PNG_HISHIFT) + sumlo;
destinyXfate 2:0e2ef1edf01b 2689 }
destinyXfate 2:0e2ef1edf01b 2690 #endif
destinyXfate 2:0e2ef1edf01b 2691
destinyXfate 2:0e2ef1edf01b 2692 if (sum < mins)
destinyXfate 2:0e2ef1edf01b 2693 {
destinyXfate 2:0e2ef1edf01b 2694 best_row = png_ptr->paeth_row;
destinyXfate 2:0e2ef1edf01b 2695 }
destinyXfate 2:0e2ef1edf01b 2696 }
destinyXfate 2:0e2ef1edf01b 2697
destinyXfate 2:0e2ef1edf01b 2698 /* Do the actual writing of the filtered row data from the chosen filter. */
destinyXfate 2:0e2ef1edf01b 2699
destinyXfate 2:0e2ef1edf01b 2700 png_write_filtered_row(png_ptr, best_row);
destinyXfate 2:0e2ef1edf01b 2701
destinyXfate 2:0e2ef1edf01b 2702 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2703 /* Save the type of filter we picked this time for future calculations */
destinyXfate 2:0e2ef1edf01b 2704 if (png_ptr->num_prev_filters > 0)
destinyXfate 2:0e2ef1edf01b 2705 {
destinyXfate 2:0e2ef1edf01b 2706 int j;
destinyXfate 2:0e2ef1edf01b 2707 for (j = 1; j < num_p_filters; j++)
destinyXfate 2:0e2ef1edf01b 2708 {
destinyXfate 2:0e2ef1edf01b 2709 png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1];
destinyXfate 2:0e2ef1edf01b 2710 }
destinyXfate 2:0e2ef1edf01b 2711 png_ptr->prev_filters[j] = best_row[0];
destinyXfate 2:0e2ef1edf01b 2712 }
destinyXfate 2:0e2ef1edf01b 2713 #endif
destinyXfate 2:0e2ef1edf01b 2714 }
destinyXfate 2:0e2ef1edf01b 2715
destinyXfate 2:0e2ef1edf01b 2716
destinyXfate 2:0e2ef1edf01b 2717 /* Do the actual writing of a previously filtered row. */
destinyXfate 2:0e2ef1edf01b 2718 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 2719 png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
destinyXfate 2:0e2ef1edf01b 2720 {
destinyXfate 2:0e2ef1edf01b 2721 png_debug(1, "in png_write_filtered_row\n");
destinyXfate 2:0e2ef1edf01b 2722 png_debug1(2, "filter = %d\n", filtered_row[0]);
destinyXfate 2:0e2ef1edf01b 2723 /* set up the zlib input buffer */
destinyXfate 2:0e2ef1edf01b 2724
destinyXfate 2:0e2ef1edf01b 2725 png_ptr->zstream.next_in = filtered_row;
destinyXfate 2:0e2ef1edf01b 2726 png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1;
destinyXfate 2:0e2ef1edf01b 2727 /* repeat until we have compressed all the data */
destinyXfate 2:0e2ef1edf01b 2728 do
destinyXfate 2:0e2ef1edf01b 2729 {
destinyXfate 2:0e2ef1edf01b 2730 int ret; /* return of zlib */
destinyXfate 2:0e2ef1edf01b 2731
destinyXfate 2:0e2ef1edf01b 2732 /* compress the data */
destinyXfate 2:0e2ef1edf01b 2733 ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
destinyXfate 2:0e2ef1edf01b 2734 /* check for compression errors */
destinyXfate 2:0e2ef1edf01b 2735 if (ret != Z_OK)
destinyXfate 2:0e2ef1edf01b 2736 {
destinyXfate 2:0e2ef1edf01b 2737 if (png_ptr->zstream.msg != NULL)
destinyXfate 2:0e2ef1edf01b 2738 png_error(png_ptr, png_ptr->zstream.msg);
destinyXfate 2:0e2ef1edf01b 2739 else
destinyXfate 2:0e2ef1edf01b 2740 png_error(png_ptr, "zlib error");
destinyXfate 2:0e2ef1edf01b 2741 }
destinyXfate 2:0e2ef1edf01b 2742
destinyXfate 2:0e2ef1edf01b 2743 /* see if it is time to write another IDAT */
destinyXfate 2:0e2ef1edf01b 2744 if (!(png_ptr->zstream.avail_out))
destinyXfate 2:0e2ef1edf01b 2745 {
destinyXfate 2:0e2ef1edf01b 2746 /* write the IDAT and reset the zlib output buffer */
destinyXfate 2:0e2ef1edf01b 2747 png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
destinyXfate 2:0e2ef1edf01b 2748 png_ptr->zstream.next_out = png_ptr->zbuf;
destinyXfate 2:0e2ef1edf01b 2749 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
destinyXfate 2:0e2ef1edf01b 2750 }
destinyXfate 2:0e2ef1edf01b 2751 /* repeat until all data has been compressed */
destinyXfate 2:0e2ef1edf01b 2752 } while (png_ptr->zstream.avail_in);
destinyXfate 2:0e2ef1edf01b 2753
destinyXfate 2:0e2ef1edf01b 2754 /* swap the current and previous rows */
destinyXfate 2:0e2ef1edf01b 2755 if (png_ptr->prev_row != NULL)
destinyXfate 2:0e2ef1edf01b 2756 {
destinyXfate 2:0e2ef1edf01b 2757 png_bytep tptr;
destinyXfate 2:0e2ef1edf01b 2758
destinyXfate 2:0e2ef1edf01b 2759 tptr = png_ptr->prev_row;
destinyXfate 2:0e2ef1edf01b 2760 png_ptr->prev_row = png_ptr->row_buf;
destinyXfate 2:0e2ef1edf01b 2761 png_ptr->row_buf = tptr;
destinyXfate 2:0e2ef1edf01b 2762 }
destinyXfate 2:0e2ef1edf01b 2763
destinyXfate 2:0e2ef1edf01b 2764 /* finish row - updates counters and flushes zlib if last row */
destinyXfate 2:0e2ef1edf01b 2765 png_write_finish_row(png_ptr);
destinyXfate 2:0e2ef1edf01b 2766
destinyXfate 2:0e2ef1edf01b 2767 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 2768 png_ptr->flush_rows++;
destinyXfate 2:0e2ef1edf01b 2769
destinyXfate 2:0e2ef1edf01b 2770 if (png_ptr->flush_dist > 0 &&
destinyXfate 2:0e2ef1edf01b 2771 png_ptr->flush_rows >= png_ptr->flush_dist)
destinyXfate 2:0e2ef1edf01b 2772 {
destinyXfate 2:0e2ef1edf01b 2773 png_write_flush(png_ptr);
destinyXfate 2:0e2ef1edf01b 2774 }
destinyXfate 2:0e2ef1edf01b 2775 #endif
destinyXfate 2:0e2ef1edf01b 2776 }
destinyXfate 2:0e2ef1edf01b 2777 #endif /* PNG_WRITE_SUPPORTED */
destinyXfate 2:0e2ef1edf01b 2778