lodePNG - LodePNG version 20160124 Copyright (c) 2005-2016…

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LodePNG version 20160124 Copyright (c) 2005-2016 Lode Vandevenne LodePNG is a PNG image decoder and encoder, all in one, no dependency or linkage to zlib or libpng required. It's made for C (ISO C90), and has a C++ wrapper with a more convenient interface on top. https://github.com/lvandeve/lodepng

lodePNG.h@0:6b244485c156, 2016-02-23 (annotated)

Committer:: unix_guru
Date:: Tue Feb 23 18:19:20 2016 +0000
Revision:: 0:6b244485c156

First version commit

; LodePNG version 20160124

;

; Copyright (c) 2005-2016 Lode Vandevenne

Who changed what in which revision?

User	Revision	Line number	New contents of line
unix_guru	0:6b244485c156	1	/*
unix_guru	0:6b244485c156	2	LodePNG version 20160124
unix_guru	0:6b244485c156	3
unix_guru	0:6b244485c156	4	Copyright (c) 2005-2016 Lode Vandevenne
unix_guru	0:6b244485c156	5
unix_guru	0:6b244485c156	6	This software is provided 'as-is', without any express or implied
unix_guru	0:6b244485c156	7	warranty. In no event will the authors be held liable for any damages
unix_guru	0:6b244485c156	8	arising from the use of this software.
unix_guru	0:6b244485c156	9
unix_guru	0:6b244485c156	10	Permission is granted to anyone to use this software for any purpose,
unix_guru	0:6b244485c156	11	including commercial applications, and to alter it and redistribute it
unix_guru	0:6b244485c156	12	freely, subject to the following restrictions:
unix_guru	0:6b244485c156	13
unix_guru	0:6b244485c156	14	1. The origin of this software must not be misrepresented; you must not
unix_guru	0:6b244485c156	15	claim that you wrote the original software. If you use this software
unix_guru	0:6b244485c156	16	in a product, an acknowledgment in the product documentation would be
unix_guru	0:6b244485c156	17	appreciated but is not required.
unix_guru	0:6b244485c156	18
unix_guru	0:6b244485c156	19	2. Altered source versions must be plainly marked as such, and must not be
unix_guru	0:6b244485c156	20	misrepresented as being the original software.
unix_guru	0:6b244485c156	21
unix_guru	0:6b244485c156	22	3. This notice may not be removed or altered from any source
unix_guru	0:6b244485c156	23	distribution.
unix_guru	0:6b244485c156	24	*/
unix_guru	0:6b244485c156	25
unix_guru	0:6b244485c156	26	#ifndef LODEPNG_H
unix_guru	0:6b244485c156	27	#define LODEPNG_H
unix_guru	0:6b244485c156	28
unix_guru	0:6b244485c156	29	#include <string.h> /for size_t/
unix_guru	0:6b244485c156	30
unix_guru	0:6b244485c156	31	extern const char* LODEPNG_VERSION_STRING;
unix_guru	0:6b244485c156	32
unix_guru	0:6b244485c156	33	/*
unix_guru	0:6b244485c156	34	The following #defines are used to create code sections. They can be disabled
unix_guru	0:6b244485c156	35	to disable code sections, which can give faster compile time and smaller binary.
unix_guru	0:6b244485c156	36	The "NO_COMPILE" defines are designed to be used to pass as defines to the
unix_guru	0:6b244485c156	37	compiler command to disable them without modifying this header, e.g.
unix_guru	0:6b244485c156	38	-DLODEPNG_NO_COMPILE_ZLIB for gcc.
unix_guru	0:6b244485c156	39	In addition to those below, you can also define LODEPNG_NO_COMPILE_CRC to
unix_guru	0:6b244485c156	40	allow implementing a custom lodepng_crc32.
unix_guru	0:6b244485c156	41	*/
unix_guru	0:6b244485c156	42	/*deflate & zlib. If disabled, you must specify alternative zlib functions in
unix_guru	0:6b244485c156	43	the custom_zlib field of the compress and decompress settings*/
unix_guru	0:6b244485c156	44	#ifndef LODEPNG_NO_COMPILE_ZLIB
unix_guru	0:6b244485c156	45	#define LODEPNG_COMPILE_ZLIB
unix_guru	0:6b244485c156	46	#endif
unix_guru	0:6b244485c156	47	/png encoder and png decoder/
unix_guru	0:6b244485c156	48	#ifndef LODEPNG_NO_COMPILE_PNG
unix_guru	0:6b244485c156	49	#define LODEPNG_COMPILE_PNG
unix_guru	0:6b244485c156	50	#endif
unix_guru	0:6b244485c156	51	/deflate&zlib decoder and png decoder/
unix_guru	0:6b244485c156	52	#ifndef LODEPNG_NO_COMPILE_DECODER
unix_guru	0:6b244485c156	53	#define LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	54	#endif
unix_guru	0:6b244485c156	55	/deflate&zlib encoder and png encoder/
unix_guru	0:6b244485c156	56	#ifndef LODEPNG_NO_COMPILE_ENCODER
unix_guru	0:6b244485c156	57	#define LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	58	#endif
unix_guru	0:6b244485c156	59	/the optional built in harddisk file loading and saving functions/
unix_guru	0:6b244485c156	60	#ifndef LODEPNG_NO_COMPILE_DISK
unix_guru	0:6b244485c156	61	#define LODEPNG_COMPILE_DISK
unix_guru	0:6b244485c156	62	#endif
unix_guru	0:6b244485c156	63	/support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks/
unix_guru	0:6b244485c156	64	#ifndef LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS
unix_guru	0:6b244485c156	65	#define LODEPNG_COMPILE_ANCILLARY_CHUNKS
unix_guru	0:6b244485c156	66	#endif
unix_guru	0:6b244485c156	67	/ability to convert error numerical codes to English text string/
unix_guru	0:6b244485c156	68	#ifndef LODEPNG_NO_COMPILE_ERROR_TEXT
unix_guru	0:6b244485c156	69	#define LODEPNG_COMPILE_ERROR_TEXT
unix_guru	0:6b244485c156	70	#endif
unix_guru	0:6b244485c156	71	/*Compile the default allocators (C's free, malloc and realloc). If you disable this,
unix_guru	0:6b244485c156	72	you can define the functions lodepng_free, lodepng_malloc and lodepng_realloc in your
unix_guru	0:6b244485c156	73	source files with custom allocators.*/
unix_guru	0:6b244485c156	74	#ifndef LODEPNG_NO_COMPILE_ALLOCATORS
unix_guru	0:6b244485c156	75	#define LODEPNG_COMPILE_ALLOCATORS
unix_guru	0:6b244485c156	76	#endif
unix_guru	0:6b244485c156	77	/compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)/
unix_guru	0:6b244485c156	78	#ifdef __cplusplus
unix_guru	0:6b244485c156	79	#ifndef LODEPNG_NO_COMPILE_CPP
unix_guru	0:6b244485c156	80	#define LODEPNG_COMPILE_CPP
unix_guru	0:6b244485c156	81	#endif
unix_guru	0:6b244485c156	82	#endif
unix_guru	0:6b244485c156	83
unix_guru	0:6b244485c156	84	#ifdef LODEPNG_COMPILE_CPP
unix_guru	0:6b244485c156	85	#include <vector>
unix_guru	0:6b244485c156	86	#include <string>
unix_guru	0:6b244485c156	87	#endif /LODEPNG_COMPILE_CPP/
unix_guru	0:6b244485c156	88
unix_guru	0:6b244485c156	89	#ifdef LODEPNG_COMPILE_PNG
unix_guru	0:6b244485c156	90	/The PNG color types (also used for raw)./
unix_guru	0:6b244485c156	91	typedef enum LodePNGColorType
unix_guru	0:6b244485c156	92	{
unix_guru	0:6b244485c156	93	LCT_GREY = 0, /greyscale: 1,2,4,8,16 bit/
unix_guru	0:6b244485c156	94	LCT_RGB = 2, /RGB: 8,16 bit/
unix_guru	0:6b244485c156	95	LCT_PALETTE = 3, /palette: 1,2,4,8 bit/
unix_guru	0:6b244485c156	96	LCT_GREY_ALPHA = 4, /greyscale with alpha: 8,16 bit/
unix_guru	0:6b244485c156	97	LCT_RGBA = 6 /RGB with alpha: 8,16 bit/
unix_guru	0:6b244485c156	98	} LodePNGColorType;
unix_guru	0:6b244485c156	99
unix_guru	0:6b244485c156	100	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	101	/*
unix_guru	0:6b244485c156	102	Converts PNG data in memory to raw pixel data.
unix_guru	0:6b244485c156	103	out: Output parameter. Pointer to buffer that will contain the raw pixel data.
unix_guru	0:6b244485c156	104	After decoding, its size is w * h * (bytes per pixel) bytes larger than
unix_guru	0:6b244485c156	105	initially. Bytes per pixel depends on colortype and bitdepth.
unix_guru	0:6b244485c156	106	Must be freed after usage with free(*out).
unix_guru	0:6b244485c156	107	Note: for 16-bit per channel colors, uses big endian format like PNG does.
unix_guru	0:6b244485c156	108	w: Output parameter. Pointer to width of pixel data.
unix_guru	0:6b244485c156	109	h: Output parameter. Pointer to height of pixel data.
unix_guru	0:6b244485c156	110	in: Memory buffer with the PNG file.
unix_guru	0:6b244485c156	111	insize: size of the in buffer.
unix_guru	0:6b244485c156	112	colortype: the desired color type for the raw output image. See explanation on PNG color types.
unix_guru	0:6b244485c156	113	bitdepth: the desired bit depth for the raw output image. See explanation on PNG color types.
unix_guru	0:6b244485c156	114	Return value: LodePNG error code (0 means no error).
unix_guru	0:6b244485c156	115	*/
unix_guru	0:6b244485c156	116	unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h,
unix_guru	0:6b244485c156	117	const unsigned char* in, size_t insize,
unix_guru	0:6b244485c156	118	LodePNGColorType colortype, unsigned bitdepth);
unix_guru	0:6b244485c156	119
unix_guru	0:6b244485c156	120	/Same as lodepng_decode_memory, but always decodes to 32-bit RGBA raw image/
unix_guru	0:6b244485c156	121	unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h,
unix_guru	0:6b244485c156	122	const unsigned char* in, size_t insize);
unix_guru	0:6b244485c156	123
unix_guru	0:6b244485c156	124	/Same as lodepng_decode_memory, but always decodes to 24-bit RGB raw image/
unix_guru	0:6b244485c156	125	unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h,
unix_guru	0:6b244485c156	126	const unsigned char* in, size_t insize);
unix_guru	0:6b244485c156	127
unix_guru	0:6b244485c156	128	#ifdef LODEPNG_COMPILE_DISK
unix_guru	0:6b244485c156	129	/*
unix_guru	0:6b244485c156	130	Load PNG from disk, from file with given name.
unix_guru	0:6b244485c156	131	Same as the other decode functions, but instead takes a filename as input.
unix_guru	0:6b244485c156	132	*/
unix_guru	0:6b244485c156	133	unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h,
unix_guru	0:6b244485c156	134	const char* filename,
unix_guru	0:6b244485c156	135	LodePNGColorType colortype, unsigned bitdepth);
unix_guru	0:6b244485c156	136
unix_guru	0:6b244485c156	137	/Same as lodepng_decode_file, but always decodes to 32-bit RGBA raw image./
unix_guru	0:6b244485c156	138	unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h,
unix_guru	0:6b244485c156	139	const char* filename);
unix_guru	0:6b244485c156	140
unix_guru	0:6b244485c156	141	/Same as lodepng_decode_file, but always decodes to 24-bit RGB raw image./
unix_guru	0:6b244485c156	142	unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h,
unix_guru	0:6b244485c156	143	const char* filename);
unix_guru	0:6b244485c156	144	#endif /LODEPNG_COMPILE_DISK/
unix_guru	0:6b244485c156	145	#endif /LODEPNG_COMPILE_DECODER/
unix_guru	0:6b244485c156	146
unix_guru	0:6b244485c156	147
unix_guru	0:6b244485c156	148	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	149	/*
unix_guru	0:6b244485c156	150	Converts raw pixel data into a PNG image in memory. The colortype and bitdepth
unix_guru	0:6b244485c156	151	of the output PNG image cannot be chosen, they are automatically determined
unix_guru	0:6b244485c156	152	by the colortype, bitdepth and content of the input pixel data.
unix_guru	0:6b244485c156	153	Note: for 16-bit per channel colors, needs big endian format like PNG does.
unix_guru	0:6b244485c156	154	out: Output parameter. Pointer to buffer that will contain the PNG image data.
unix_guru	0:6b244485c156	155	Must be freed after usage with free(*out).
unix_guru	0:6b244485c156	156	outsize: Output parameter. Pointer to the size in bytes of the out buffer.
unix_guru	0:6b244485c156	157	image: The raw pixel data to encode. The size of this buffer should be
unix_guru	0:6b244485c156	158	w * h * (bytes per pixel), bytes per pixel depends on colortype and bitdepth.
unix_guru	0:6b244485c156	159	w: width of the raw pixel data in pixels.
unix_guru	0:6b244485c156	160	h: height of the raw pixel data in pixels.
unix_guru	0:6b244485c156	161	colortype: the color type of the raw input image. See explanation on PNG color types.
unix_guru	0:6b244485c156	162	bitdepth: the bit depth of the raw input image. See explanation on PNG color types.
unix_guru	0:6b244485c156	163	Return value: LodePNG error code (0 means no error).
unix_guru	0:6b244485c156	164	*/
unix_guru	0:6b244485c156	165	unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize,
unix_guru	0:6b244485c156	166	const unsigned char* image, unsigned w, unsigned h,
unix_guru	0:6b244485c156	167	LodePNGColorType colortype, unsigned bitdepth);
unix_guru	0:6b244485c156	168
unix_guru	0:6b244485c156	169	/Same as lodepng_encode_memory, but always encodes from 32-bit RGBA raw image./
unix_guru	0:6b244485c156	170	unsigned lodepng_encode32(unsigned char** out, size_t* outsize,
unix_guru	0:6b244485c156	171	const unsigned char* image, unsigned w, unsigned h);
unix_guru	0:6b244485c156	172
unix_guru	0:6b244485c156	173	/Same as lodepng_encode_memory, but always encodes from 24-bit RGB raw image./
unix_guru	0:6b244485c156	174	unsigned lodepng_encode24(unsigned char** out, size_t* outsize,
unix_guru	0:6b244485c156	175	const unsigned char* image, unsigned w, unsigned h);
unix_guru	0:6b244485c156	176
unix_guru	0:6b244485c156	177	#ifdef LODEPNG_COMPILE_DISK
unix_guru	0:6b244485c156	178	/*
unix_guru	0:6b244485c156	179	Converts raw pixel data into a PNG file on disk.
unix_guru	0:6b244485c156	180	Same as the other encode functions, but instead takes a filename as output.
unix_guru	0:6b244485c156	181	NOTE: This overwrites existing files without warning!
unix_guru	0:6b244485c156	182	*/
unix_guru	0:6b244485c156	183	unsigned lodepng_encode_file(const char* filename,
unix_guru	0:6b244485c156	184	const unsigned char* image, unsigned w, unsigned h,
unix_guru	0:6b244485c156	185	LodePNGColorType colortype, unsigned bitdepth);
unix_guru	0:6b244485c156	186
unix_guru	0:6b244485c156	187	/Same as lodepng_encode_file, but always encodes from 32-bit RGBA raw image./
unix_guru	0:6b244485c156	188	unsigned lodepng_encode32_file(const char* filename,
unix_guru	0:6b244485c156	189	const unsigned char* image, unsigned w, unsigned h);
unix_guru	0:6b244485c156	190
unix_guru	0:6b244485c156	191	/Same as lodepng_encode_file, but always encodes from 24-bit RGB raw image./
unix_guru	0:6b244485c156	192	unsigned lodepng_encode24_file(const char* filename,
unix_guru	0:6b244485c156	193	const unsigned char* image, unsigned w, unsigned h);
unix_guru	0:6b244485c156	194	#endif /LODEPNG_COMPILE_DISK/
unix_guru	0:6b244485c156	195	#endif /LODEPNG_COMPILE_ENCODER/
unix_guru	0:6b244485c156	196
unix_guru	0:6b244485c156	197
unix_guru	0:6b244485c156	198	#ifdef LODEPNG_COMPILE_CPP
unix_guru	0:6b244485c156	199	namespace lodepng
unix_guru	0:6b244485c156	200	{
unix_guru	0:6b244485c156	201	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	202	/*Same as lodepng_decode_memory, but decodes to an std::vector. The colortype
unix_guru	0:6b244485c156	203	is the format to output the pixels to. Default is RGBA 8-bit per channel.*/
unix_guru	0:6b244485c156	204	unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
unix_guru	0:6b244485c156	205	const unsigned char* in, size_t insize,
unix_guru	0:6b244485c156	206	LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
unix_guru	0:6b244485c156	207	unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
unix_guru	0:6b244485c156	208	const std::vector<unsigned char>& in,
unix_guru	0:6b244485c156	209	LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
unix_guru	0:6b244485c156	210	#ifdef LODEPNG_COMPILE_DISK
unix_guru	0:6b244485c156	211	/*
unix_guru	0:6b244485c156	212	Converts PNG file from disk to raw pixel data in memory.
unix_guru	0:6b244485c156	213	Same as the other decode functions, but instead takes a filename as input.
unix_guru	0:6b244485c156	214	*/
unix_guru	0:6b244485c156	215	unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
unix_guru	0:6b244485c156	216	const std::string& filename,
unix_guru	0:6b244485c156	217	LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
unix_guru	0:6b244485c156	218	#endif /* LODEPNG_COMPILE_DISK */
unix_guru	0:6b244485c156	219	#endif /* LODEPNG_COMPILE_DECODER */
unix_guru	0:6b244485c156	220
unix_guru	0:6b244485c156	221	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	222	/*Same as lodepng_encode_memory, but encodes to an std::vector. colortype
unix_guru	0:6b244485c156	223	is that of the raw input data. The output PNG color type will be auto chosen.*/
unix_guru	0:6b244485c156	224	unsigned encode(std::vector<unsigned char>& out,
unix_guru	0:6b244485c156	225	const unsigned char* in, unsigned w, unsigned h,
unix_guru	0:6b244485c156	226	LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
unix_guru	0:6b244485c156	227	unsigned encode(std::vector<unsigned char>& out,
unix_guru	0:6b244485c156	228	const std::vector<unsigned char>& in, unsigned w, unsigned h,
unix_guru	0:6b244485c156	229	LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
unix_guru	0:6b244485c156	230	#ifdef LODEPNG_COMPILE_DISK
unix_guru	0:6b244485c156	231	/*
unix_guru	0:6b244485c156	232	Converts 32-bit RGBA raw pixel data into a PNG file on disk.
unix_guru	0:6b244485c156	233	Same as the other encode functions, but instead takes a filename as output.
unix_guru	0:6b244485c156	234	NOTE: This overwrites existing files without warning!
unix_guru	0:6b244485c156	235	*/
unix_guru	0:6b244485c156	236	unsigned encode(const std::string& filename,
unix_guru	0:6b244485c156	237	const unsigned char* in, unsigned w, unsigned h,
unix_guru	0:6b244485c156	238	LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
unix_guru	0:6b244485c156	239	unsigned encode(const std::string& filename,
unix_guru	0:6b244485c156	240	const std::vector<unsigned char>& in, unsigned w, unsigned h,
unix_guru	0:6b244485c156	241	LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
unix_guru	0:6b244485c156	242	#endif /* LODEPNG_COMPILE_DISK */
unix_guru	0:6b244485c156	243	#endif /* LODEPNG_COMPILE_ENCODER */
unix_guru	0:6b244485c156	244	} /* namespace lodepng */
unix_guru	0:6b244485c156	245	#endif /LODEPNG_COMPILE_CPP/
unix_guru	0:6b244485c156	246	#endif /LODEPNG_COMPILE_PNG/
unix_guru	0:6b244485c156	247
unix_guru	0:6b244485c156	248	#ifdef LODEPNG_COMPILE_ERROR_TEXT
unix_guru	0:6b244485c156	249	/Returns an English description of the numerical error code./
unix_guru	0:6b244485c156	250	const char* lodepng_error_text(unsigned code);
unix_guru	0:6b244485c156	251	#endif /LODEPNG_COMPILE_ERROR_TEXT/
unix_guru	0:6b244485c156	252
unix_guru	0:6b244485c156	253	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	254	/Settings for zlib decompression/
unix_guru	0:6b244485c156	255	typedef struct LodePNGDecompressSettings LodePNGDecompressSettings;
unix_guru	0:6b244485c156	256	struct LodePNGDecompressSettings
unix_guru	0:6b244485c156	257	{
unix_guru	0:6b244485c156	258	unsigned ignore_adler32; /if 1, continue and don't give an error message if the Adler32 checksum is corrupted/
unix_guru	0:6b244485c156	259
unix_guru	0:6b244485c156	260	/use custom zlib decoder instead of built in one (default: null)/
unix_guru	0:6b244485c156	261	unsigned (custom_zlib)(unsigned char, size_t,
unix_guru	0:6b244485c156	262	const unsigned char*, size_t,
unix_guru	0:6b244485c156	263	const LodePNGDecompressSettings*);
unix_guru	0:6b244485c156	264	/*use custom deflate decoder instead of built in one (default: null)
unix_guru	0:6b244485c156	265	if custom_zlib is used, custom_deflate is ignored since only the built in
unix_guru	0:6b244485c156	266	zlib function will call custom_deflate*/
unix_guru	0:6b244485c156	267	unsigned (custom_inflate)(unsigned char, size_t,
unix_guru	0:6b244485c156	268	const unsigned char*, size_t,
unix_guru	0:6b244485c156	269	const LodePNGDecompressSettings*);
unix_guru	0:6b244485c156	270
unix_guru	0:6b244485c156	271	const void* custom_context; /optional custom settings for custom functions/
unix_guru	0:6b244485c156	272	};
unix_guru	0:6b244485c156	273
unix_guru	0:6b244485c156	274	extern const LodePNGDecompressSettings lodepng_default_decompress_settings;
unix_guru	0:6b244485c156	275	void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings);
unix_guru	0:6b244485c156	276	#endif /LODEPNG_COMPILE_DECODER/
unix_guru	0:6b244485c156	277
unix_guru	0:6b244485c156	278	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	279	/*
unix_guru	0:6b244485c156	280	Settings for zlib compression. Tweaking these settings tweaks the balance
unix_guru	0:6b244485c156	281	between speed and compression ratio.
unix_guru	0:6b244485c156	282	*/
unix_guru	0:6b244485c156	283	typedef struct LodePNGCompressSettings LodePNGCompressSettings;
unix_guru	0:6b244485c156	284	struct LodePNGCompressSettings /deflate = compress/
unix_guru	0:6b244485c156	285	{
unix_guru	0:6b244485c156	286	/LZ77 related settings/
unix_guru	0:6b244485c156	287	unsigned btype; /the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression./
unix_guru	0:6b244485c156	288	unsigned use_lz77; /whether or not to use LZ77. Should be 1 for proper compression./
unix_guru	0:6b244485c156	289	unsigned windowsize; /must be a power of two <= 32768. higher compresses more but is slower. Default value: 2048./
unix_guru	0:6b244485c156	290	unsigned minmatch; /mininum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0/
unix_guru	0:6b244485c156	291	unsigned nicematch; /stop searching if >= this length found. Set to 258 for best compression. Default: 128/
unix_guru	0:6b244485c156	292	unsigned lazymatching; /use lazy matching: better compression but a bit slower. Default: true/
unix_guru	0:6b244485c156	293
unix_guru	0:6b244485c156	294	/use custom zlib encoder instead of built in one (default: null)/
unix_guru	0:6b244485c156	295	unsigned (custom_zlib)(unsigned char, size_t,
unix_guru	0:6b244485c156	296	const unsigned char*, size_t,
unix_guru	0:6b244485c156	297	const LodePNGCompressSettings*);
unix_guru	0:6b244485c156	298	/*use custom deflate encoder instead of built in one (default: null)
unix_guru	0:6b244485c156	299	if custom_zlib is used, custom_deflate is ignored since only the built in
unix_guru	0:6b244485c156	300	zlib function will call custom_deflate*/
unix_guru	0:6b244485c156	301	unsigned (custom_deflate)(unsigned char, size_t,
unix_guru	0:6b244485c156	302	const unsigned char*, size_t,
unix_guru	0:6b244485c156	303	const LodePNGCompressSettings*);
unix_guru	0:6b244485c156	304
unix_guru	0:6b244485c156	305	const void* custom_context; /optional custom settings for custom functions/
unix_guru	0:6b244485c156	306	};
unix_guru	0:6b244485c156	307
unix_guru	0:6b244485c156	308	extern const LodePNGCompressSettings lodepng_default_compress_settings;
unix_guru	0:6b244485c156	309	void lodepng_compress_settings_init(LodePNGCompressSettings* settings);
unix_guru	0:6b244485c156	310	#endif /LODEPNG_COMPILE_ENCODER/
unix_guru	0:6b244485c156	311
unix_guru	0:6b244485c156	312	#ifdef LODEPNG_COMPILE_PNG
unix_guru	0:6b244485c156	313	/*
unix_guru	0:6b244485c156	314	Color mode of an image. Contains all information required to decode the pixel
unix_guru	0:6b244485c156	315	bits to RGBA colors. This information is the same as used in the PNG file
unix_guru	0:6b244485c156	316	format, and is used both for PNG and raw image data in LodePNG.
unix_guru	0:6b244485c156	317	*/
unix_guru	0:6b244485c156	318	typedef struct LodePNGColorMode
unix_guru	0:6b244485c156	319	{
unix_guru	0:6b244485c156	320	/header (IHDR)/
unix_guru	0:6b244485c156	321	LodePNGColorType colortype; /color type, see PNG standard or documentation further in this header file/
unix_guru	0:6b244485c156	322	unsigned bitdepth; /bits per sample, see PNG standard or documentation further in this header file/
unix_guru	0:6b244485c156	323
unix_guru	0:6b244485c156	324	/*
unix_guru	0:6b244485c156	325	palette (PLTE and tRNS)
unix_guru	0:6b244485c156	326
unix_guru	0:6b244485c156	327	Dynamically allocated with the colors of the palette, including alpha.
unix_guru	0:6b244485c156	328	When encoding a PNG, to store your colors in the palette of the LodePNGColorMode, first use
unix_guru	0:6b244485c156	329	lodepng_palette_clear, then for each color use lodepng_palette_add.
unix_guru	0:6b244485c156	330	If you encode an image without alpha with palette, don't forget to put value 255 in each A byte of the palette.
unix_guru	0:6b244485c156	331
unix_guru	0:6b244485c156	332	When decoding, by default you can ignore this palette, since LodePNG already
unix_guru	0:6b244485c156	333	fills the palette colors in the pixels of the raw RGBA output.
unix_guru	0:6b244485c156	334
unix_guru	0:6b244485c156	335	The palette is only supported for color type 3.
unix_guru	0:6b244485c156	336	*/
unix_guru	0:6b244485c156	337	unsigned char* palette; /palette in RGBARGBA... order. When allocated, must be either 0, or have size 1024/
unix_guru	0:6b244485c156	338	size_t palettesize; /palette size in number of colors (amount of bytes is 4 palettesize)*/
unix_guru	0:6b244485c156	339
unix_guru	0:6b244485c156	340	/*
unix_guru	0:6b244485c156	341	transparent color key (tRNS)
unix_guru	0:6b244485c156	342
unix_guru	0:6b244485c156	343	This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit.
unix_guru	0:6b244485c156	344	For greyscale PNGs, r, g and b will all 3 be set to the same.
unix_guru	0:6b244485c156	345
unix_guru	0:6b244485c156	346	When decoding, by default you can ignore this information, since LodePNG sets
unix_guru	0:6b244485c156	347	pixels with this key to transparent already in the raw RGBA output.
unix_guru	0:6b244485c156	348
unix_guru	0:6b244485c156	349	The color key is only supported for color types 0 and 2.
unix_guru	0:6b244485c156	350	*/
unix_guru	0:6b244485c156	351	unsigned key_defined; /is a transparent color key given? 0 = false, 1 = true/
unix_guru	0:6b244485c156	352	unsigned key_r; /red/greyscale component of color key/
unix_guru	0:6b244485c156	353	unsigned key_g; /green component of color key/
unix_guru	0:6b244485c156	354	unsigned key_b; /blue component of color key/
unix_guru	0:6b244485c156	355	} LodePNGColorMode;
unix_guru	0:6b244485c156	356
unix_guru	0:6b244485c156	357	/init, cleanup and copy functions to use with this struct/
unix_guru	0:6b244485c156	358	void lodepng_color_mode_init(LodePNGColorMode* info);
unix_guru	0:6b244485c156	359	void lodepng_color_mode_cleanup(LodePNGColorMode* info);
unix_guru	0:6b244485c156	360	/return value is error code (0 means no error)/
unix_guru	0:6b244485c156	361	unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source);
unix_guru	0:6b244485c156	362
unix_guru	0:6b244485c156	363	void lodepng_palette_clear(LodePNGColorMode* info);
unix_guru	0:6b244485c156	364	/add 1 color to the palette/
unix_guru	0:6b244485c156	365	unsigned lodepng_palette_add(LodePNGColorMode* info,
unix_guru	0:6b244485c156	366	unsigned char r, unsigned char g, unsigned char b, unsigned char a);
unix_guru	0:6b244485c156	367
unix_guru	0:6b244485c156	368	/get the total amount of bits per pixel, based on colortype and bitdepth in the struct/
unix_guru	0:6b244485c156	369	unsigned lodepng_get_bpp(const LodePNGColorMode* info);
unix_guru	0:6b244485c156	370	/*get the amount of color channels used, based on colortype in the struct.
unix_guru	0:6b244485c156	371	If a palette is used, it counts as 1 channel.*/
unix_guru	0:6b244485c156	372	unsigned lodepng_get_channels(const LodePNGColorMode* info);
unix_guru	0:6b244485c156	373	/is it a greyscale type? (only colortype 0 or 4)/
unix_guru	0:6b244485c156	374	unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info);
unix_guru	0:6b244485c156	375	/has it got an alpha channel? (only colortype 2 or 6)/
unix_guru	0:6b244485c156	376	unsigned lodepng_is_alpha_type(const LodePNGColorMode* info);
unix_guru	0:6b244485c156	377	/has it got a palette? (only colortype 3)/
unix_guru	0:6b244485c156	378	unsigned lodepng_is_palette_type(const LodePNGColorMode* info);
unix_guru	0:6b244485c156	379	/*only returns true if there is a palette and there is a value in the palette with alpha < 255.
unix_guru	0:6b244485c156	380	Loops through the palette to check this.*/
unix_guru	0:6b244485c156	381	unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info);
unix_guru	0:6b244485c156	382	/*
unix_guru	0:6b244485c156	383	Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image.
unix_guru	0:6b244485c156	384	Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels).
unix_guru	0:6b244485c156	385	Returns false if the image can only have opaque pixels.
unix_guru	0:6b244485c156	386	In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values,
unix_guru	0:6b244485c156	387	or if "key_defined" is true.
unix_guru	0:6b244485c156	388	*/
unix_guru	0:6b244485c156	389	unsigned lodepng_can_have_alpha(const LodePNGColorMode* info);
unix_guru	0:6b244485c156	390	/Returns the byte size of a raw image buffer with given width, height and color mode/
unix_guru	0:6b244485c156	391	size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color);
unix_guru	0:6b244485c156	392
unix_guru	0:6b244485c156	393	#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
unix_guru	0:6b244485c156	394	/The information of a Time chunk in PNG./
unix_guru	0:6b244485c156	395	typedef struct LodePNGTime
unix_guru	0:6b244485c156	396	{
unix_guru	0:6b244485c156	397	unsigned year; /2 bytes used (0-65535)/
unix_guru	0:6b244485c156	398	unsigned month; /1-12/
unix_guru	0:6b244485c156	399	unsigned day; /1-31/
unix_guru	0:6b244485c156	400	unsigned hour; /0-23/
unix_guru	0:6b244485c156	401	unsigned minute; /0-59/
unix_guru	0:6b244485c156	402	unsigned second; /0-60 (to allow for leap seconds)/
unix_guru	0:6b244485c156	403	} LodePNGTime;
unix_guru	0:6b244485c156	404	#endif /LODEPNG_COMPILE_ANCILLARY_CHUNKS/
unix_guru	0:6b244485c156	405
unix_guru	0:6b244485c156	406	/Information about the PNG image, except pixels, width and height./
unix_guru	0:6b244485c156	407	typedef struct LodePNGInfo
unix_guru	0:6b244485c156	408	{
unix_guru	0:6b244485c156	409	/header (IHDR), palette (PLTE) and transparency (tRNS) chunks/
unix_guru	0:6b244485c156	410	unsigned compression_method;/compression method of the original file. Always 0./
unix_guru	0:6b244485c156	411	unsigned filter_method; /filter method of the original file/
unix_guru	0:6b244485c156	412	unsigned interlace_method; /interlace method of the original file/
unix_guru	0:6b244485c156	413	LodePNGColorMode color; /color type and bits, palette and transparency of the PNG file/
unix_guru	0:6b244485c156	414
unix_guru	0:6b244485c156	415	#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
unix_guru	0:6b244485c156	416	/*
unix_guru	0:6b244485c156	417	suggested background color chunk (bKGD)
unix_guru	0:6b244485c156	418	This color uses the same color mode as the PNG (except alpha channel), which can be 1-bit to 16-bit.
unix_guru	0:6b244485c156	419
unix_guru	0:6b244485c156	420	For greyscale PNGs, r, g and b will all 3 be set to the same. When encoding
unix_guru	0:6b244485c156	421	the encoder writes the red one. For palette PNGs: When decoding, the RGB value
unix_guru	0:6b244485c156	422	will be stored, not a palette index. But when encoding, specify the index of
unix_guru	0:6b244485c156	423	the palette in background_r, the other two are then ignored.
unix_guru	0:6b244485c156	424
unix_guru	0:6b244485c156	425	The decoder does not use this background color to edit the color of pixels.
unix_guru	0:6b244485c156	426	*/
unix_guru	0:6b244485c156	427	unsigned background_defined; /is a suggested background color given?/
unix_guru	0:6b244485c156	428	unsigned background_r; /red component of suggested background color/
unix_guru	0:6b244485c156	429	unsigned background_g; /green component of suggested background color/
unix_guru	0:6b244485c156	430	unsigned background_b; /blue component of suggested background color/
unix_guru	0:6b244485c156	431
unix_guru	0:6b244485c156	432	/*
unix_guru	0:6b244485c156	433	non-international text chunks (tEXt and zTXt)
unix_guru	0:6b244485c156	434
unix_guru	0:6b244485c156	435	The char** arrays each contain num strings. The actual messages are in
unix_guru	0:6b244485c156	436	text_strings, while text_keys are keywords that give a short description what
unix_guru	0:6b244485c156	437	the actual text represents, e.g. Title, Author, Description, or anything else.
unix_guru	0:6b244485c156	438
unix_guru	0:6b244485c156	439	A keyword is minimum 1 character and maximum 79 characters long. It's
unix_guru	0:6b244485c156	440	discouraged to use a single line length longer than 79 characters for texts.
unix_guru	0:6b244485c156	441
unix_guru	0:6b244485c156	442	Don't allocate these text buffers yourself. Use the init/cleanup functions
unix_guru	0:6b244485c156	443	correctly and use lodepng_add_text and lodepng_clear_text.
unix_guru	0:6b244485c156	444	*/
unix_guru	0:6b244485c156	445	size_t text_num; /the amount of texts in these char* buffers (there may be more texts in itext)*/
unix_guru	0:6b244485c156	446	char** text_keys; /the keyword of a text chunk (e.g. "Comment")/
unix_guru	0:6b244485c156	447	char** text_strings; /the actual text/
unix_guru	0:6b244485c156	448
unix_guru	0:6b244485c156	449	/*
unix_guru	0:6b244485c156	450	international text chunks (iTXt)
unix_guru	0:6b244485c156	451	Similar to the non-international text chunks, but with additional strings
unix_guru	0:6b244485c156	452	"langtags" and "transkeys".
unix_guru	0:6b244485c156	453	*/
unix_guru	0:6b244485c156	454	size_t itext_num; /the amount of international texts in this PNG/
unix_guru	0:6b244485c156	455	char** itext_keys; /the English keyword of the text chunk (e.g. "Comment")/
unix_guru	0:6b244485c156	456	char** itext_langtags; /language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag/
unix_guru	0:6b244485c156	457	char** itext_transkeys; /keyword translated to the international language - UTF-8 string/
unix_guru	0:6b244485c156	458	char** itext_strings; /the actual international text - UTF-8 string/
unix_guru	0:6b244485c156	459
unix_guru	0:6b244485c156	460	/time chunk (tIME)/
unix_guru	0:6b244485c156	461	unsigned time_defined; /set to 1 to make the encoder generate a tIME chunk/
unix_guru	0:6b244485c156	462	LodePNGTime time;
unix_guru	0:6b244485c156	463
unix_guru	0:6b244485c156	464	/phys chunk (pHYs)/
unix_guru	0:6b244485c156	465	unsigned phys_defined; /if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one/
unix_guru	0:6b244485c156	466	unsigned phys_x; /pixels per unit in x direction/
unix_guru	0:6b244485c156	467	unsigned phys_y; /pixels per unit in y direction/
unix_guru	0:6b244485c156	468	unsigned phys_unit; /may be 0 (unknown unit) or 1 (metre)/
unix_guru	0:6b244485c156	469
unix_guru	0:6b244485c156	470	/*
unix_guru	0:6b244485c156	471	unknown chunks
unix_guru	0:6b244485c156	472	There are 3 buffers, one for each position in the PNG where unknown chunks can appear
unix_guru	0:6b244485c156	473	each buffer contains all unknown chunks for that position consecutively
unix_guru	0:6b244485c156	474	The 3 buffers are the unknown chunks between certain critical chunks:
unix_guru	0:6b244485c156	475	0: IHDR-PLTE, 1: PLTE-IDAT, 2: IDAT-IEND
unix_guru	0:6b244485c156	476	Do not allocate or traverse this data yourself. Use the chunk traversing functions declared
unix_guru	0:6b244485c156	477	later, such as lodepng_chunk_next and lodepng_chunk_append, to read/write this struct.
unix_guru	0:6b244485c156	478	*/
unix_guru	0:6b244485c156	479	unsigned char* unknown_chunks_data[3];
unix_guru	0:6b244485c156	480	size_t unknown_chunks_size[3]; /size in bytes of the unknown chunks, given for protection/
unix_guru	0:6b244485c156	481	#endif /LODEPNG_COMPILE_ANCILLARY_CHUNKS/
unix_guru	0:6b244485c156	482	} LodePNGInfo;
unix_guru	0:6b244485c156	483
unix_guru	0:6b244485c156	484	/init, cleanup and copy functions to use with this struct/
unix_guru	0:6b244485c156	485	void lodepng_info_init(LodePNGInfo* info);
unix_guru	0:6b244485c156	486	void lodepng_info_cleanup(LodePNGInfo* info);
unix_guru	0:6b244485c156	487	/return value is error code (0 means no error)/
unix_guru	0:6b244485c156	488	unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source);
unix_guru	0:6b244485c156	489
unix_guru	0:6b244485c156	490	#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
unix_guru	0:6b244485c156	491	void lodepng_clear_text(LodePNGInfo* info); /use this to clear the texts again after you filled them in/
unix_guru	0:6b244485c156	492	unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str); /push back both texts at once/
unix_guru	0:6b244485c156	493
unix_guru	0:6b244485c156	494	void lodepng_clear_itext(LodePNGInfo* info); /use this to clear the itexts again after you filled them in/
unix_guru	0:6b244485c156	495	unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag,
unix_guru	0:6b244485c156	496	const char* transkey, const char* str); /push back the 4 texts of 1 chunk at once/
unix_guru	0:6b244485c156	497	#endif /LODEPNG_COMPILE_ANCILLARY_CHUNKS/
unix_guru	0:6b244485c156	498
unix_guru	0:6b244485c156	499	/*
unix_guru	0:6b244485c156	500	Converts raw buffer from one color type to another color type, based on
unix_guru	0:6b244485c156	501	LodePNGColorMode structs to describe the input and output color type.
unix_guru	0:6b244485c156	502	See the reference manual at the end of this header file to see which color conversions are supported.
unix_guru	0:6b244485c156	503	return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported)
unix_guru	0:6b244485c156	504	The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel
unix_guru	0:6b244485c156	505	of the output color type (lodepng_get_bpp).
unix_guru	0:6b244485c156	506	For < 8 bpp images, there should not be padding bits at the end of scanlines.
unix_guru	0:6b244485c156	507	For 16-bit per channel colors, uses big endian format like PNG does.
unix_guru	0:6b244485c156	508	Return value is LodePNG error code
unix_guru	0:6b244485c156	509	*/
unix_guru	0:6b244485c156	510	unsigned lodepng_convert(unsigned char* out, const unsigned char* in,
unix_guru	0:6b244485c156	511	const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in,
unix_guru	0:6b244485c156	512	unsigned w, unsigned h);
unix_guru	0:6b244485c156	513
unix_guru	0:6b244485c156	514	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	515	/*
unix_guru	0:6b244485c156	516	Settings for the decoder. This contains settings for the PNG and the Zlib
unix_guru	0:6b244485c156	517	decoder, but not the Info settings from the Info structs.
unix_guru	0:6b244485c156	518	*/
unix_guru	0:6b244485c156	519	typedef struct LodePNGDecoderSettings
unix_guru	0:6b244485c156	520	{
unix_guru	0:6b244485c156	521	LodePNGDecompressSettings zlibsettings; /in here is the setting to ignore Adler32 checksums/
unix_guru	0:6b244485c156	522
unix_guru	0:6b244485c156	523	unsigned ignore_crc; /ignore CRC checksums/
unix_guru	0:6b244485c156	524
unix_guru	0:6b244485c156	525	unsigned color_convert; /whether to convert the PNG to the color type you want. Default: yes/
unix_guru	0:6b244485c156	526
unix_guru	0:6b244485c156	527	#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
unix_guru	0:6b244485c156	528	unsigned read_text_chunks; /if false but remember_unknown_chunks is true, they're stored in the unknown chunks/
unix_guru	0:6b244485c156	529	/store all bytes from unknown chunks in the LodePNGInfo (off by default, useful for a png editor)/
unix_guru	0:6b244485c156	530	unsigned remember_unknown_chunks;
unix_guru	0:6b244485c156	531	#endif /LODEPNG_COMPILE_ANCILLARY_CHUNKS/
unix_guru	0:6b244485c156	532	} LodePNGDecoderSettings;
unix_guru	0:6b244485c156	533
unix_guru	0:6b244485c156	534	void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings);
unix_guru	0:6b244485c156	535	#endif /LODEPNG_COMPILE_DECODER/
unix_guru	0:6b244485c156	536
unix_guru	0:6b244485c156	537	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	538	/automatically use color type with less bits per pixel if losslessly possible. Default: AUTO/
unix_guru	0:6b244485c156	539	typedef enum LodePNGFilterStrategy
unix_guru	0:6b244485c156	540	{
unix_guru	0:6b244485c156	541	/every filter at zero/
unix_guru	0:6b244485c156	542	LFS_ZERO,
unix_guru	0:6b244485c156	543	/Use filter that gives minimum sum, as described in the official PNG filter heuristic./
unix_guru	0:6b244485c156	544	LFS_MINSUM,
unix_guru	0:6b244485c156	545	/*Use the filter type that gives smallest Shannon entropy for this scanline. Depending
unix_guru	0:6b244485c156	546	on the image, this is better or worse than minsum.*/
unix_guru	0:6b244485c156	547	LFS_ENTROPY,
unix_guru	0:6b244485c156	548	/*
unix_guru	0:6b244485c156	549	Brute-force-search PNG filters by compressing each filter for each scanline.
unix_guru	0:6b244485c156	550	Experimental, very slow, and only rarely gives better compression than MINSUM.
unix_guru	0:6b244485c156	551	*/
unix_guru	0:6b244485c156	552	LFS_BRUTE_FORCE,
unix_guru	0:6b244485c156	553	/use predefined_filters buffer: you specify the filter type for each scanline/
unix_guru	0:6b244485c156	554	LFS_PREDEFINED
unix_guru	0:6b244485c156	555	} LodePNGFilterStrategy;
unix_guru	0:6b244485c156	556
unix_guru	0:6b244485c156	557	/*Gives characteristics about the colors of the image, which helps decide which color model to use for encoding.
unix_guru	0:6b244485c156	558	Used internally by default if "auto_convert" is enabled. Public because it's useful for custom algorithms.*/
unix_guru	0:6b244485c156	559	typedef struct LodePNGColorProfile
unix_guru	0:6b244485c156	560	{
unix_guru	0:6b244485c156	561	unsigned colored; /not greyscale/
unix_guru	0:6b244485c156	562	unsigned key; /if true, image is not opaque. Only if true and alpha is false, color key is possible./
unix_guru	0:6b244485c156	563	unsigned short key_r; /these values are always in 16-bit bitdepth in the profile/
unix_guru	0:6b244485c156	564	unsigned short key_g;
unix_guru	0:6b244485c156	565	unsigned short key_b;
unix_guru	0:6b244485c156	566	unsigned alpha; /alpha channel or alpha palette required/
unix_guru	0:6b244485c156	567	unsigned numcolors; /amount of colors, up to 257. Not valid if bits == 16./
unix_guru	0:6b244485c156	568	unsigned char palette[1024]; /Remembers up to the first 256 RGBA colors, in no particular order/
unix_guru	0:6b244485c156	569	unsigned bits; /bits per channel (not for palette). 1,2 or 4 for greyscale only. 16 if 16-bit per channel required./
unix_guru	0:6b244485c156	570	} LodePNGColorProfile;
unix_guru	0:6b244485c156	571
unix_guru	0:6b244485c156	572	void lodepng_color_profile_init(LodePNGColorProfile* profile);
unix_guru	0:6b244485c156	573
unix_guru	0:6b244485c156	574	/Get a LodePNGColorProfile of the image./
unix_guru	0:6b244485c156	575	unsigned lodepng_get_color_profile(LodePNGColorProfile* profile,
unix_guru	0:6b244485c156	576	const unsigned char* image, unsigned w, unsigned h,
unix_guru	0:6b244485c156	577	const LodePNGColorMode* mode_in);
unix_guru	0:6b244485c156	578	/*The function LodePNG uses internally to decide the PNG color with auto_convert.
unix_guru	0:6b244485c156	579	Chooses an optimal color model, e.g. grey if only grey pixels, palette if < 256 colors, ...*/
unix_guru	0:6b244485c156	580	unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out,
unix_guru	0:6b244485c156	581	const unsigned char* image, unsigned w, unsigned h,
unix_guru	0:6b244485c156	582	const LodePNGColorMode* mode_in);
unix_guru	0:6b244485c156	583
unix_guru	0:6b244485c156	584	/Settings for the encoder./
unix_guru	0:6b244485c156	585	typedef struct LodePNGEncoderSettings
unix_guru	0:6b244485c156	586	{
unix_guru	0:6b244485c156	587	LodePNGCompressSettings zlibsettings; /settings for the zlib encoder, such as window size, .../
unix_guru	0:6b244485c156	588
unix_guru	0:6b244485c156	589	unsigned auto_convert; /automatically choose output PNG color type. Default: true/
unix_guru	0:6b244485c156	590
unix_guru	0:6b244485c156	591	/*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than
unix_guru	0:6b244485c156	592	8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to
unix_guru	0:6b244485c156	593	completely follow the official PNG heuristic, filter_palette_zero must be true and
unix_guru	0:6b244485c156	594	filter_strategy must be LFS_MINSUM*/
unix_guru	0:6b244485c156	595	unsigned filter_palette_zero;
unix_guru	0:6b244485c156	596	/*Which filter strategy to use when not using zeroes due to filter_palette_zero.
unix_guru	0:6b244485c156	597	Set filter_palette_zero to 0 to ensure always using your chosen strategy. Default: LFS_MINSUM*/
unix_guru	0:6b244485c156	598	LodePNGFilterStrategy filter_strategy;
unix_guru	0:6b244485c156	599	/*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with
unix_guru	0:6b244485c156	600	the same length as the amount of scanlines in the image, and each value must <= 5. You
unix_guru	0:6b244485c156	601	have to cleanup this buffer, LodePNG will never free it. Don't forget that filter_palette_zero
unix_guru	0:6b244485c156	602	must be set to 0 to ensure this is also used on palette or low bitdepth images.*/
unix_guru	0:6b244485c156	603	const unsigned char* predefined_filters;
unix_guru	0:6b244485c156	604
unix_guru	0:6b244485c156	605	/*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette).
unix_guru	0:6b244485c156	606	If colortype is 3, PLTE is _always_ created.*/
unix_guru	0:6b244485c156	607	unsigned force_palette;
unix_guru	0:6b244485c156	608	#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
unix_guru	0:6b244485c156	609	/add LodePNG identifier and version as a text chunk, for debugging/
unix_guru	0:6b244485c156	610	unsigned add_id;
unix_guru	0:6b244485c156	611	/encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks/
unix_guru	0:6b244485c156	612	unsigned text_compression;
unix_guru	0:6b244485c156	613	#endif /LODEPNG_COMPILE_ANCILLARY_CHUNKS/
unix_guru	0:6b244485c156	614	} LodePNGEncoderSettings;
unix_guru	0:6b244485c156	615
unix_guru	0:6b244485c156	616	void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings);
unix_guru	0:6b244485c156	617	#endif /LODEPNG_COMPILE_ENCODER/
unix_guru	0:6b244485c156	618
unix_guru	0:6b244485c156	619
unix_guru	0:6b244485c156	620	#if defined(LODEPNG_COMPILE_DECODER) \|\| defined(LODEPNG_COMPILE_ENCODER)
unix_guru	0:6b244485c156	621	/The settings, state and information for extended encoding and decoding./
unix_guru	0:6b244485c156	622	typedef struct LodePNGState
unix_guru	0:6b244485c156	623	{
unix_guru	0:6b244485c156	624	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	625	LodePNGDecoderSettings decoder; /the decoding settings/
unix_guru	0:6b244485c156	626	#endif /LODEPNG_COMPILE_DECODER/
unix_guru	0:6b244485c156	627	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	628	LodePNGEncoderSettings encoder; /the encoding settings/
unix_guru	0:6b244485c156	629	#endif /LODEPNG_COMPILE_ENCODER/
unix_guru	0:6b244485c156	630	LodePNGColorMode info_raw; /specifies the format in which you would like to get the raw pixel buffer/
unix_guru	0:6b244485c156	631	LodePNGInfo info_png; /info of the PNG image obtained after decoding/
unix_guru	0:6b244485c156	632	unsigned error;
unix_guru	0:6b244485c156	633	#ifdef LODEPNG_COMPILE_CPP
unix_guru	0:6b244485c156	634	/* For the lodepng::State subclass. */
unix_guru	0:6b244485c156	635	virtual ~LodePNGState(){}
unix_guru	0:6b244485c156	636	#endif
unix_guru	0:6b244485c156	637	} LodePNGState;
unix_guru	0:6b244485c156	638
unix_guru	0:6b244485c156	639	/init, cleanup and copy functions to use with this struct/
unix_guru	0:6b244485c156	640	void lodepng_state_init(LodePNGState* state);
unix_guru	0:6b244485c156	641	void lodepng_state_cleanup(LodePNGState* state);
unix_guru	0:6b244485c156	642	void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source);
unix_guru	0:6b244485c156	643	#endif /* defined(LODEPNG_COMPILE_DECODER) \|\| defined(LODEPNG_COMPILE_ENCODER) */
unix_guru	0:6b244485c156	644
unix_guru	0:6b244485c156	645	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	646	/*
unix_guru	0:6b244485c156	647	Same as lodepng_decode_memory, but uses a LodePNGState to allow custom settings and
unix_guru	0:6b244485c156	648	getting much more information about the PNG image and color mode.
unix_guru	0:6b244485c156	649	*/
unix_guru	0:6b244485c156	650	unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h,
unix_guru	0:6b244485c156	651	LodePNGState* state,
unix_guru	0:6b244485c156	652	const unsigned char* in, size_t insize);
unix_guru	0:6b244485c156	653
unix_guru	0:6b244485c156	654	/*
unix_guru	0:6b244485c156	655	Read the PNG header, but not the actual data. This returns only the information
unix_guru	0:6b244485c156	656	that is in the header chunk of the PNG, such as width, height and color type. The
unix_guru	0:6b244485c156	657	information is placed in the info_png field of the LodePNGState.
unix_guru	0:6b244485c156	658	*/
unix_guru	0:6b244485c156	659	unsigned lodepng_inspect(unsigned* w, unsigned* h,
unix_guru	0:6b244485c156	660	LodePNGState* state,
unix_guru	0:6b244485c156	661	const unsigned char* in, size_t insize);
unix_guru	0:6b244485c156	662	#endif /LODEPNG_COMPILE_DECODER/
unix_guru	0:6b244485c156	663
unix_guru	0:6b244485c156	664
unix_guru	0:6b244485c156	665	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	666	/This function allocates the out buffer with standard malloc and stores the size in outsize.*/
unix_guru	0:6b244485c156	667	unsigned lodepng_encode(unsigned char** out, size_t* outsize,
unix_guru	0:6b244485c156	668	const unsigned char* image, unsigned w, unsigned h,
unix_guru	0:6b244485c156	669	LodePNGState* state);
unix_guru	0:6b244485c156	670	#endif /LODEPNG_COMPILE_ENCODER/
unix_guru	0:6b244485c156	671
unix_guru	0:6b244485c156	672	/*
unix_guru	0:6b244485c156	673	The lodepng_chunk functions are normally not needed, except to traverse the
unix_guru	0:6b244485c156	674	unknown chunks stored in the LodePNGInfo struct, or add new ones to it.
unix_guru	0:6b244485c156	675	It also allows traversing the chunks of an encoded PNG file yourself.
unix_guru	0:6b244485c156	676
unix_guru	0:6b244485c156	677	PNG standard chunk naming conventions:
unix_guru	0:6b244485c156	678	First byte: uppercase = critical, lowercase = ancillary
unix_guru	0:6b244485c156	679	Second byte: uppercase = public, lowercase = private
unix_guru	0:6b244485c156	680	Third byte: must be uppercase
unix_guru	0:6b244485c156	681	Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy
unix_guru	0:6b244485c156	682	*/
unix_guru	0:6b244485c156	683
unix_guru	0:6b244485c156	684	/*
unix_guru	0:6b244485c156	685	Gets the length of the data of the chunk. Total chunk length has 12 bytes more.
unix_guru	0:6b244485c156	686	There must be at least 4 bytes to read from. If the result value is too large,
unix_guru	0:6b244485c156	687	it may be corrupt data.
unix_guru	0:6b244485c156	688	*/
unix_guru	0:6b244485c156	689	unsigned lodepng_chunk_length(const unsigned char* chunk);
unix_guru	0:6b244485c156	690
unix_guru	0:6b244485c156	691	/puts the 4-byte type in null terminated string/
unix_guru	0:6b244485c156	692	void lodepng_chunk_type(char type[5], const unsigned char* chunk);
unix_guru	0:6b244485c156	693
unix_guru	0:6b244485c156	694	/check if the type is the given type/
unix_guru	0:6b244485c156	695	unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type);
unix_guru	0:6b244485c156	696
unix_guru	0:6b244485c156	697	/0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)/
unix_guru	0:6b244485c156	698	unsigned char lodepng_chunk_ancillary(const unsigned char* chunk);
unix_guru	0:6b244485c156	699
unix_guru	0:6b244485c156	700	/0: public, 1: private (see PNG standard)/
unix_guru	0:6b244485c156	701	unsigned char lodepng_chunk_private(const unsigned char* chunk);
unix_guru	0:6b244485c156	702
unix_guru	0:6b244485c156	703	/0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)/
unix_guru	0:6b244485c156	704	unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk);
unix_guru	0:6b244485c156	705
unix_guru	0:6b244485c156	706	/get pointer to the data of the chunk, where the input points to the header of the chunk/
unix_guru	0:6b244485c156	707	unsigned char* lodepng_chunk_data(unsigned char* chunk);
unix_guru	0:6b244485c156	708	const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk);
unix_guru	0:6b244485c156	709
unix_guru	0:6b244485c156	710	/returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)/
unix_guru	0:6b244485c156	711	unsigned lodepng_chunk_check_crc(const unsigned char* chunk);
unix_guru	0:6b244485c156	712
unix_guru	0:6b244485c156	713	/generates the correct CRC from the data and puts it in the last 4 bytes of the chunk/
unix_guru	0:6b244485c156	714	void lodepng_chunk_generate_crc(unsigned char* chunk);
unix_guru	0:6b244485c156	715
unix_guru	0:6b244485c156	716	/iterate to next chunks. don't use on IEND chunk, as there is no next chunk then/
unix_guru	0:6b244485c156	717	unsigned char* lodepng_chunk_next(unsigned char* chunk);
unix_guru	0:6b244485c156	718	const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk);
unix_guru	0:6b244485c156	719
unix_guru	0:6b244485c156	720	/*
unix_guru	0:6b244485c156	721	Appends chunk to the data in out. The given chunk should already have its chunk header.
unix_guru	0:6b244485c156	722	The out variable and outlength are updated to reflect the new reallocated buffer.
unix_guru	0:6b244485c156	723	Returns error code (0 if it went ok)
unix_guru	0:6b244485c156	724	*/
unix_guru	0:6b244485c156	725	unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk);
unix_guru	0:6b244485c156	726
unix_guru	0:6b244485c156	727	/*
unix_guru	0:6b244485c156	728	Appends new chunk to out. The chunk to append is given by giving its length, type
unix_guru	0:6b244485c156	729	and data separately. The type is a 4-letter string.
unix_guru	0:6b244485c156	730	The out variable and outlength are updated to reflect the new reallocated buffer.
unix_guru	0:6b244485c156	731	Returne error code (0 if it went ok)
unix_guru	0:6b244485c156	732	*/
unix_guru	0:6b244485c156	733	unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length,
unix_guru	0:6b244485c156	734	const char* type, const unsigned char* data);
unix_guru	0:6b244485c156	735
unix_guru	0:6b244485c156	736
unix_guru	0:6b244485c156	737	/Calculate CRC32 of buffer/
unix_guru	0:6b244485c156	738	unsigned lodepng_crc32(const unsigned char* buf, size_t len);
unix_guru	0:6b244485c156	739	#endif /LODEPNG_COMPILE_PNG/
unix_guru	0:6b244485c156	740
unix_guru	0:6b244485c156	741
unix_guru	0:6b244485c156	742	#ifdef LODEPNG_COMPILE_ZLIB
unix_guru	0:6b244485c156	743	/*
unix_guru	0:6b244485c156	744	This zlib part can be used independently to zlib compress and decompress a
unix_guru	0:6b244485c156	745	buffer. It cannot be used to create gzip files however, and it only supports the
unix_guru	0:6b244485c156	746	part of zlib that is required for PNG, it does not support dictionaries.
unix_guru	0:6b244485c156	747	*/
unix_guru	0:6b244485c156	748
unix_guru	0:6b244485c156	749	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	750	/Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use./
unix_guru	0:6b244485c156	751	unsigned lodepng_inflate(unsigned char** out, size_t* outsize,
unix_guru	0:6b244485c156	752	const unsigned char* in, size_t insize,
unix_guru	0:6b244485c156	753	const LodePNGDecompressSettings* settings);
unix_guru	0:6b244485c156	754
unix_guru	0:6b244485c156	755	/*
unix_guru	0:6b244485c156	756	Decompresses Zlib data. Reallocates the out buffer and appends the data. The
unix_guru	0:6b244485c156	757	data must be according to the zlib specification.
unix_guru	0:6b244485c156	758	Either, out must be NULL and outsize must be 0, or, *out must be a valid
unix_guru	0:6b244485c156	759	buffer and *outsize its size in bytes. out must be freed by user after usage.
unix_guru	0:6b244485c156	760	*/
unix_guru	0:6b244485c156	761	unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize,
unix_guru	0:6b244485c156	762	const unsigned char* in, size_t insize,
unix_guru	0:6b244485c156	763	const LodePNGDecompressSettings* settings);
unix_guru	0:6b244485c156	764	#endif /LODEPNG_COMPILE_DECODER/
unix_guru	0:6b244485c156	765
unix_guru	0:6b244485c156	766	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	767	/*
unix_guru	0:6b244485c156	768	Compresses data with Zlib. Reallocates the out buffer and appends the data.
unix_guru	0:6b244485c156	769	Zlib adds a small header and trailer around the deflate data.
unix_guru	0:6b244485c156	770	The data is output in the format of the zlib specification.
unix_guru	0:6b244485c156	771	Either, out must be NULL and outsize must be 0, or, *out must be a valid
unix_guru	0:6b244485c156	772	buffer and *outsize its size in bytes. out must be freed by user after usage.
unix_guru	0:6b244485c156	773	*/
unix_guru	0:6b244485c156	774	unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize,
unix_guru	0:6b244485c156	775	const unsigned char* in, size_t insize,
unix_guru	0:6b244485c156	776	const LodePNGCompressSettings* settings);
unix_guru	0:6b244485c156	777
unix_guru	0:6b244485c156	778	/*
unix_guru	0:6b244485c156	779	Find length-limited Huffman code for given frequencies. This function is in the
unix_guru	0:6b244485c156	780	public interface only for tests, it's used internally by lodepng_deflate.
unix_guru	0:6b244485c156	781	*/
unix_guru	0:6b244485c156	782	unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies,
unix_guru	0:6b244485c156	783	size_t numcodes, unsigned maxbitlen);
unix_guru	0:6b244485c156	784
unix_guru	0:6b244485c156	785	/Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use./
unix_guru	0:6b244485c156	786	unsigned lodepng_deflate(unsigned char** out, size_t* outsize,
unix_guru	0:6b244485c156	787	const unsigned char* in, size_t insize,
unix_guru	0:6b244485c156	788	const LodePNGCompressSettings* settings);
unix_guru	0:6b244485c156	789
unix_guru	0:6b244485c156	790	#endif /LODEPNG_COMPILE_ENCODER/
unix_guru	0:6b244485c156	791	#endif /LODEPNG_COMPILE_ZLIB/
unix_guru	0:6b244485c156	792
unix_guru	0:6b244485c156	793	#ifdef LODEPNG_COMPILE_DISK
unix_guru	0:6b244485c156	794	/*
unix_guru	0:6b244485c156	795	Load a file from disk into buffer. The function allocates the out buffer, and
unix_guru	0:6b244485c156	796	after usage you should free it.
unix_guru	0:6b244485c156	797	out: output parameter, contains pointer to loaded buffer.
unix_guru	0:6b244485c156	798	outsize: output parameter, size of the allocated out buffer
unix_guru	0:6b244485c156	799	filename: the path to the file to load
unix_guru	0:6b244485c156	800	return value: error code (0 means ok)
unix_guru	0:6b244485c156	801	*/
unix_guru	0:6b244485c156	802	unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename);
unix_guru	0:6b244485c156	803
unix_guru	0:6b244485c156	804	/*
unix_guru	0:6b244485c156	805	Save a file from buffer to disk. Warning, if it exists, this function overwrites
unix_guru	0:6b244485c156	806	the file without warning!
unix_guru	0:6b244485c156	807	buffer: the buffer to write
unix_guru	0:6b244485c156	808	buffersize: size of the buffer to write
unix_guru	0:6b244485c156	809	filename: the path to the file to save to
unix_guru	0:6b244485c156	810	return value: error code (0 means ok)
unix_guru	0:6b244485c156	811	*/
unix_guru	0:6b244485c156	812	unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename);
unix_guru	0:6b244485c156	813	#endif /LODEPNG_COMPILE_DISK/
unix_guru	0:6b244485c156	814
unix_guru	0:6b244485c156	815	#ifdef LODEPNG_COMPILE_CPP
unix_guru	0:6b244485c156	816	/* The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers. */
unix_guru	0:6b244485c156	817	namespace lodepng
unix_guru	0:6b244485c156	818	{
unix_guru	0:6b244485c156	819	#ifdef LODEPNG_COMPILE_PNG
unix_guru	0:6b244485c156	820	class State : public LodePNGState
unix_guru	0:6b244485c156	821	{
unix_guru	0:6b244485c156	822	public:
unix_guru	0:6b244485c156	823	State();
unix_guru	0:6b244485c156	824	State(const State& other);
unix_guru	0:6b244485c156	825	virtual ~State();
unix_guru	0:6b244485c156	826	State& operator=(const State& other);
unix_guru	0:6b244485c156	827	};
unix_guru	0:6b244485c156	828
unix_guru	0:6b244485c156	829	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	830	/* Same as other lodepng::decode, but using a State for more settings and information. */
unix_guru	0:6b244485c156	831	unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
unix_guru	0:6b244485c156	832	State& state,
unix_guru	0:6b244485c156	833	const unsigned char* in, size_t insize);
unix_guru	0:6b244485c156	834	unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
unix_guru	0:6b244485c156	835	State& state,
unix_guru	0:6b244485c156	836	const std::vector<unsigned char>& in);
unix_guru	0:6b244485c156	837	#endif /LODEPNG_COMPILE_DECODER/
unix_guru	0:6b244485c156	838
unix_guru	0:6b244485c156	839	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	840	/* Same as other lodepng::encode, but using a State for more settings and information. */
unix_guru	0:6b244485c156	841	unsigned encode(std::vector<unsigned char>& out,
unix_guru	0:6b244485c156	842	const unsigned char* in, unsigned w, unsigned h,
unix_guru	0:6b244485c156	843	State& state);
unix_guru	0:6b244485c156	844	unsigned encode(std::vector<unsigned char>& out,
unix_guru	0:6b244485c156	845	const std::vector<unsigned char>& in, unsigned w, unsigned h,
unix_guru	0:6b244485c156	846	State& state);
unix_guru	0:6b244485c156	847	#endif /LODEPNG_COMPILE_ENCODER/
unix_guru	0:6b244485c156	848
unix_guru	0:6b244485c156	849	#ifdef LODEPNG_COMPILE_DISK
unix_guru	0:6b244485c156	850	/*
unix_guru	0:6b244485c156	851	Load a file from disk into an std::vector.
unix_guru	0:6b244485c156	852	return value: error code (0 means ok)
unix_guru	0:6b244485c156	853	*/
unix_guru	0:6b244485c156	854	unsigned load_file(std::vector<unsigned char>& buffer, const std::string& filename);
unix_guru	0:6b244485c156	855
unix_guru	0:6b244485c156	856	/*
unix_guru	0:6b244485c156	857	Save the binary data in an std::vector to a file on disk. The file is overwritten
unix_guru	0:6b244485c156	858	without warning.
unix_guru	0:6b244485c156	859	*/
unix_guru	0:6b244485c156	860	unsigned save_file(const std::vector<unsigned char>& buffer, const std::string& filename);
unix_guru	0:6b244485c156	861	#endif /* LODEPNG_COMPILE_DISK */
unix_guru	0:6b244485c156	862	#endif /* LODEPNG_COMPILE_PNG */
unix_guru	0:6b244485c156	863
unix_guru	0:6b244485c156	864	#ifdef LODEPNG_COMPILE_ZLIB
unix_guru	0:6b244485c156	865	#ifdef LODEPNG_COMPILE_DECODER
unix_guru	0:6b244485c156	866	/* Zlib-decompress an unsigned char buffer */
unix_guru	0:6b244485c156	867	unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
unix_guru	0:6b244485c156	868	const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
unix_guru	0:6b244485c156	869
unix_guru	0:6b244485c156	870	/* Zlib-decompress an std::vector */
unix_guru	0:6b244485c156	871	unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
unix_guru	0:6b244485c156	872	const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
unix_guru	0:6b244485c156	873	#endif /* LODEPNG_COMPILE_DECODER */
unix_guru	0:6b244485c156	874
unix_guru	0:6b244485c156	875	#ifdef LODEPNG_COMPILE_ENCODER
unix_guru	0:6b244485c156	876	/* Zlib-compress an unsigned char buffer */
unix_guru	0:6b244485c156	877	unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
unix_guru	0:6b244485c156	878	const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
unix_guru	0:6b244485c156	879
unix_guru	0:6b244485c156	880	/* Zlib-compress an std::vector */
unix_guru	0:6b244485c156	881	unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
unix_guru	0:6b244485c156	882	const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
unix_guru	0:6b244485c156	883	#endif /* LODEPNG_COMPILE_ENCODER */
unix_guru	0:6b244485c156	884	#endif /* LODEPNG_COMPILE_ZLIB */
unix_guru	0:6b244485c156	885	} /* namespace lodepng */
unix_guru	0:6b244485c156	886	#endif /LODEPNG_COMPILE_CPP/
unix_guru	0:6b244485c156	887
unix_guru	0:6b244485c156	888	/*
unix_guru	0:6b244485c156	889	TODO:
unix_guru	0:6b244485c156	890	[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often
unix_guru	0:6b244485c156	891	[.] check compatibility with various compilers - done but needs to be redone for every newer version
unix_guru	0:6b244485c156	892	[X] converting color to 16-bit per channel types
unix_guru	0:6b244485c156	893	[ ] read all public PNG chunk types (but never let the color profile and gamma ones touch RGB values)
unix_guru	0:6b244485c156	894	[ ] make sure encoder generates no chunks with size > (2^31)-1
unix_guru	0:6b244485c156	895	[ ] partial decoding (stream processing)
unix_guru	0:6b244485c156	896	[X] let the "isFullyOpaque" function check color keys and transparent palettes too
unix_guru	0:6b244485c156	897	[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl"
unix_guru	0:6b244485c156	898	[ ] don't stop decoding on errors like 69, 57, 58 (make warnings)
unix_guru	0:6b244485c156	899	[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes
unix_guru	0:6b244485c156	900	[ ] allow user to provide custom color conversion functions, e.g. for premultiplied alpha, padding bits or not, ...
unix_guru	0:6b244485c156	901	[ ] allow user to give data (void*) to custom allocator
unix_guru	0:6b244485c156	902	*/
unix_guru	0:6b244485c156	903
unix_guru	0:6b244485c156	904	#endif /LODEPNG_H inclusion guard/
unix_guru	0:6b244485c156	905
unix_guru	0:6b244485c156	906	/*
unix_guru	0:6b244485c156	907	LodePNG Documentation
unix_guru	0:6b244485c156	908	---------------------
unix_guru	0:6b244485c156	909
unix_guru	0:6b244485c156	910	0. table of contents
unix_guru	0:6b244485c156	911	--------------------
unix_guru	0:6b244485c156	912
unix_guru	0:6b244485c156	913	1. about
unix_guru	0:6b244485c156	914	1.1. supported features
unix_guru	0:6b244485c156	915	1.2. features not supported
unix_guru	0:6b244485c156	916	2. C and C++ version
unix_guru	0:6b244485c156	917	3. security
unix_guru	0:6b244485c156	918	4. decoding
unix_guru	0:6b244485c156	919	5. encoding
unix_guru	0:6b244485c156	920	6. color conversions
unix_guru	0:6b244485c156	921	6.1. PNG color types
unix_guru	0:6b244485c156	922	6.2. color conversions
unix_guru	0:6b244485c156	923	6.3. padding bits
unix_guru	0:6b244485c156	924	6.4. A note about 16-bits per channel and endianness
unix_guru	0:6b244485c156	925	7. error values
unix_guru	0:6b244485c156	926	8. chunks and PNG editing
unix_guru	0:6b244485c156	927	9. compiler support
unix_guru	0:6b244485c156	928	10. examples
unix_guru	0:6b244485c156	929	10.1. decoder C++ example
unix_guru	0:6b244485c156	930	10.2. decoder C example
unix_guru	0:6b244485c156	931	11. state settings reference
unix_guru	0:6b244485c156	932	12. changes
unix_guru	0:6b244485c156	933	13. contact information
unix_guru	0:6b244485c156	934
unix_guru	0:6b244485c156	935
unix_guru	0:6b244485c156	936	1. about
unix_guru	0:6b244485c156	937	--------
unix_guru	0:6b244485c156	938
unix_guru	0:6b244485c156	939	PNG is a file format to store raster images losslessly with good compression,
unix_guru	0:6b244485c156	940	supporting different color types and alpha channel.
unix_guru	0:6b244485c156	941
unix_guru	0:6b244485c156	942	LodePNG is a PNG codec according to the Portable Network Graphics (PNG)
unix_guru	0:6b244485c156	943	Specification (Second Edition) - W3C Recommendation 10 November 2003.
unix_guru	0:6b244485c156	944
unix_guru	0:6b244485c156	945	The specifications used are:
unix_guru	0:6b244485c156	946
unix_guru	0:6b244485c156	947	*) Portable Network Graphics (PNG) Specification (Second Edition):
unix_guru	0:6b244485c156	948	http://www.w3.org/TR/2003/REC-PNG-20031110
unix_guru	0:6b244485c156	949	*) RFC 1950 ZLIB Compressed Data Format version 3.3:
unix_guru	0:6b244485c156	950	http://www.gzip.org/zlib/rfc-zlib.html
unix_guru	0:6b244485c156	951	*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3:
unix_guru	0:6b244485c156	952	http://www.gzip.org/zlib/rfc-deflate.html
unix_guru	0:6b244485c156	953
unix_guru	0:6b244485c156	954	The most recent version of LodePNG can currently be found at
unix_guru	0:6b244485c156	955	http://lodev.org/lodepng/
unix_guru	0:6b244485c156	956
unix_guru	0:6b244485c156	957	LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds
unix_guru	0:6b244485c156	958	extra functionality.
unix_guru	0:6b244485c156	959
unix_guru	0:6b244485c156	960	LodePNG exists out of two files:
unix_guru	0:6b244485c156	961	-lodepng.h: the header file for both C and C++
unix_guru	0:6b244485c156	962	-lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage
unix_guru	0:6b244485c156	963
unix_guru	0:6b244485c156	964	If you want to start using LodePNG right away without reading this doc, get the
unix_guru	0:6b244485c156	965	examples from the LodePNG website to see how to use it in code, or check the
unix_guru	0:6b244485c156	966	smaller examples in chapter 13 here.
unix_guru	0:6b244485c156	967
unix_guru	0:6b244485c156	968	LodePNG is simple but only supports the basic requirements. To achieve
unix_guru	0:6b244485c156	969	simplicity, the following design choices were made: There are no dependencies
unix_guru	0:6b244485c156	970	on any external library. There are functions to decode and encode a PNG with
unix_guru	0:6b244485c156	971	a single function call, and extended versions of these functions taking a
unix_guru	0:6b244485c156	972	LodePNGState struct allowing to specify or get more information. By default
unix_guru	0:6b244485c156	973	the colors of the raw image are always RGB or RGBA, no matter what color type
unix_guru	0:6b244485c156	974	the PNG file uses. To read and write files, there are simple functions to
unix_guru	0:6b244485c156	975	convert the files to/from buffers in memory.
unix_guru	0:6b244485c156	976
unix_guru	0:6b244485c156	977	This all makes LodePNG suitable for loading textures in games, demos and small
unix_guru	0:6b244485c156	978	programs, ... It's less suitable for full fledged image editors, loading PNGs
unix_guru	0:6b244485c156	979	over network (it requires all the image data to be available before decoding can
unix_guru	0:6b244485c156	980	begin), life-critical systems, ...
unix_guru	0:6b244485c156	981
unix_guru	0:6b244485c156	982	1.1. supported features
unix_guru	0:6b244485c156	983	-----------------------
unix_guru	0:6b244485c156	984
unix_guru	0:6b244485c156	985	The following features are supported by the decoder:
unix_guru	0:6b244485c156	986
unix_guru	0:6b244485c156	987	*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image,
unix_guru	0:6b244485c156	988	or the same color type as the PNG
unix_guru	0:6b244485c156	989	*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image
unix_guru	0:6b244485c156	990	*) Adam7 interlace and deinterlace for any color type
unix_guru	0:6b244485c156	991	*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk
unix_guru	0:6b244485c156	992	*) support for alpha channels, including RGBA color model, translucent palettes and color keying
unix_guru	0:6b244485c156	993	*) zlib decompression (inflate)
unix_guru	0:6b244485c156	994	*) zlib compression (deflate)
unix_guru	0:6b244485c156	995	*) CRC32 and ADLER32 checksums
unix_guru	0:6b244485c156	996	*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks.
unix_guru	0:6b244485c156	997	*) the following chunks are supported (generated/interpreted) by both encoder and decoder:
unix_guru	0:6b244485c156	998	IHDR: header information
unix_guru	0:6b244485c156	999	PLTE: color palette
unix_guru	0:6b244485c156	1000	IDAT: pixel data
unix_guru	0:6b244485c156	1001	IEND: the final chunk
unix_guru	0:6b244485c156	1002	tRNS: transparency for palettized images
unix_guru	0:6b244485c156	1003	tEXt: textual information
unix_guru	0:6b244485c156	1004	zTXt: compressed textual information
unix_guru	0:6b244485c156	1005	iTXt: international textual information
unix_guru	0:6b244485c156	1006	bKGD: suggested background color
unix_guru	0:6b244485c156	1007	pHYs: physical dimensions
unix_guru	0:6b244485c156	1008	tIME: modification time
unix_guru	0:6b244485c156	1009
unix_guru	0:6b244485c156	1010	1.2. features not supported
unix_guru	0:6b244485c156	1011	---------------------------
unix_guru	0:6b244485c156	1012
unix_guru	0:6b244485c156	1013	The following features are _not_ supported:
unix_guru	0:6b244485c156	1014
unix_guru	0:6b244485c156	1015	*) some features needed to make a conformant PNG-Editor might be still missing.
unix_guru	0:6b244485c156	1016	*) partial loading/stream processing. All data must be available and is processed in one call.
unix_guru	0:6b244485c156	1017	*) The following public chunks are not supported but treated as unknown chunks by LodePNG
unix_guru	0:6b244485c156	1018	cHRM, gAMA, iCCP, sRGB, sBIT, hIST, sPLT
unix_guru	0:6b244485c156	1019	Some of these are not supported on purpose: LodePNG wants to provide the RGB values
unix_guru	0:6b244485c156	1020	stored in the pixels, not values modified by system dependent gamma or color models.
unix_guru	0:6b244485c156	1021
unix_guru	0:6b244485c156	1022
unix_guru	0:6b244485c156	1023	2. C and C++ version
unix_guru	0:6b244485c156	1024	--------------------
unix_guru	0:6b244485c156	1025
unix_guru	0:6b244485c156	1026	The C version uses buffers allocated with alloc that you need to free()
unix_guru	0:6b244485c156	1027	yourself. You need to use init and cleanup functions for each struct whenever
unix_guru	0:6b244485c156	1028	using a struct from the C version to avoid exploits and memory leaks.
unix_guru	0:6b244485c156	1029
unix_guru	0:6b244485c156	1030	The C++ version has extra functions with std::vectors in the interface and the
unix_guru	0:6b244485c156	1031	lodepng::State class which is a LodePNGState with constructor and destructor.
unix_guru	0:6b244485c156	1032
unix_guru	0:6b244485c156	1033	These files work without modification for both C and C++ compilers because all
unix_guru	0:6b244485c156	1034	the additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers
unix_guru	0:6b244485c156	1035	ignore it, and the C code is made to compile both with strict ISO C90 and C++.
unix_guru	0:6b244485c156	1036
unix_guru	0:6b244485c156	1037	To use the C++ version, you need to rename the source file to lodepng.cpp
unix_guru	0:6b244485c156	1038	(instead of lodepng.c), and compile it with a C++ compiler.
unix_guru	0:6b244485c156	1039
unix_guru	0:6b244485c156	1040	To use the C version, you need to rename the source file to lodepng.c (instead
unix_guru	0:6b244485c156	1041	of lodepng.cpp), and compile it with a C compiler.
unix_guru	0:6b244485c156	1042
unix_guru	0:6b244485c156	1043
unix_guru	0:6b244485c156	1044	3. Security
unix_guru	0:6b244485c156	1045	-----------
unix_guru	0:6b244485c156	1046
unix_guru	0:6b244485c156	1047	Even if carefully designed, it's always possible that LodePNG contains possible
unix_guru	0:6b244485c156	1048	exploits. If you discover one, please let me know, and it will be fixed.
unix_guru	0:6b244485c156	1049
unix_guru	0:6b244485c156	1050	When using LodePNG, care has to be taken with the C version of LodePNG, as well
unix_guru	0:6b244485c156	1051	as the C-style structs when working with C++. The following conventions are used
unix_guru	0:6b244485c156	1052	for all C-style structs:
unix_guru	0:6b244485c156	1053
unix_guru	0:6b244485c156	1054	-if a struct has a corresponding init function, always call the init function when making a new one
unix_guru	0:6b244485c156	1055	-if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks
unix_guru	0:6b244485c156	1056	-if a struct has a corresponding copy function, use the copy function instead of "=".
unix_guru	0:6b244485c156	1057	The destination must also be inited already.
unix_guru	0:6b244485c156	1058
unix_guru	0:6b244485c156	1059
unix_guru	0:6b244485c156	1060	4. Decoding
unix_guru	0:6b244485c156	1061	-----------
unix_guru	0:6b244485c156	1062
unix_guru	0:6b244485c156	1063	Decoding converts a PNG compressed image to a raw pixel buffer.
unix_guru	0:6b244485c156	1064
unix_guru	0:6b244485c156	1065	Most documentation on using the decoder is at its declarations in the header
unix_guru	0:6b244485c156	1066	above. For C, simple decoding can be done with functions such as
unix_guru	0:6b244485c156	1067	lodepng_decode32, and more advanced decoding can be done with the struct
unix_guru	0:6b244485c156	1068	LodePNGState and lodepng_decode. For C++, all decoding can be done with the
unix_guru	0:6b244485c156	1069	various lodepng::decode functions, and lodepng::State can be used for advanced
unix_guru	0:6b244485c156	1070	features.
unix_guru	0:6b244485c156	1071
unix_guru	0:6b244485c156	1072	When using the LodePNGState, it uses the following fields for decoding:
unix_guru	0:6b244485c156	1073	*) LodePNGInfo info_png: it stores extra information about the PNG (the input) in here
unix_guru	0:6b244485c156	1074	*) LodePNGColorMode info_raw: here you can say what color mode of the raw image (the output) you want to get
unix_guru	0:6b244485c156	1075	*) LodePNGDecoderSettings decoder: you can specify a few extra settings for the decoder to use
unix_guru	0:6b244485c156	1076
unix_guru	0:6b244485c156	1077	LodePNGInfo info_png
unix_guru	0:6b244485c156	1078	--------------------
unix_guru	0:6b244485c156	1079
unix_guru	0:6b244485c156	1080	After decoding, this contains extra information of the PNG image, except the actual
unix_guru	0:6b244485c156	1081	pixels, width and height because these are already gotten directly from the decoder
unix_guru	0:6b244485c156	1082	functions.
unix_guru	0:6b244485c156	1083
unix_guru	0:6b244485c156	1084	It contains for example the original color type of the PNG image, text comments,
unix_guru	0:6b244485c156	1085	suggested background color, etc... More details about the LodePNGInfo struct are
unix_guru	0:6b244485c156	1086	at its declaration documentation.
unix_guru	0:6b244485c156	1087
unix_guru	0:6b244485c156	1088	LodePNGColorMode info_raw
unix_guru	0:6b244485c156	1089	-------------------------
unix_guru	0:6b244485c156	1090
unix_guru	0:6b244485c156	1091	When decoding, here you can specify which color type you want
unix_guru	0:6b244485c156	1092	the resulting raw image to be. If this is different from the colortype of the
unix_guru	0:6b244485c156	1093	PNG, then the decoder will automatically convert the result. This conversion
unix_guru	0:6b244485c156	1094	always works, except if you want it to convert a color PNG to greyscale or to
unix_guru	0:6b244485c156	1095	a palette with missing colors.
unix_guru	0:6b244485c156	1096
unix_guru	0:6b244485c156	1097	By default, 32-bit color is used for the result.
unix_guru	0:6b244485c156	1098
unix_guru	0:6b244485c156	1099	LodePNGDecoderSettings decoder
unix_guru	0:6b244485c156	1100	------------------------------
unix_guru	0:6b244485c156	1101
unix_guru	0:6b244485c156	1102	The settings can be used to ignore the errors created by invalid CRC and Adler32
unix_guru	0:6b244485c156	1103	chunks, and to disable the decoding of tEXt chunks.
unix_guru	0:6b244485c156	1104
unix_guru	0:6b244485c156	1105	There's also a setting color_convert, true by default. If false, no conversion
unix_guru	0:6b244485c156	1106	is done, the resulting data will be as it was in the PNG (after decompression)
unix_guru	0:6b244485c156	1107	and you'll have to puzzle the colors of the pixels together yourself using the
unix_guru	0:6b244485c156	1108	color type information in the LodePNGInfo.
unix_guru	0:6b244485c156	1109
unix_guru	0:6b244485c156	1110
unix_guru	0:6b244485c156	1111	5. Encoding
unix_guru	0:6b244485c156	1112	-----------
unix_guru	0:6b244485c156	1113
unix_guru	0:6b244485c156	1114	Encoding converts a raw pixel buffer to a PNG compressed image.
unix_guru	0:6b244485c156	1115
unix_guru	0:6b244485c156	1116	Most documentation on using the encoder is at its declarations in the header
unix_guru	0:6b244485c156	1117	above. For C, simple encoding can be done with functions such as
unix_guru	0:6b244485c156	1118	lodepng_encode32, and more advanced decoding can be done with the struct
unix_guru	0:6b244485c156	1119	LodePNGState and lodepng_encode. For C++, all encoding can be done with the
unix_guru	0:6b244485c156	1120	various lodepng::encode functions, and lodepng::State can be used for advanced
unix_guru	0:6b244485c156	1121	features.
unix_guru	0:6b244485c156	1122
unix_guru	0:6b244485c156	1123	Like the decoder, the encoder can also give errors. However it gives less errors
unix_guru	0:6b244485c156	1124	since the encoder input is trusted, the decoder input (a PNG image that could
unix_guru	0:6b244485c156	1125	be forged by anyone) is not trusted.
unix_guru	0:6b244485c156	1126
unix_guru	0:6b244485c156	1127	When using the LodePNGState, it uses the following fields for encoding:
unix_guru	0:6b244485c156	1128	*) LodePNGInfo info_png: here you specify how you want the PNG (the output) to be.
unix_guru	0:6b244485c156	1129	*) LodePNGColorMode info_raw: here you say what color type of the raw image (the input) has
unix_guru	0:6b244485c156	1130	*) LodePNGEncoderSettings encoder: you can specify a few settings for the encoder to use
unix_guru	0:6b244485c156	1131
unix_guru	0:6b244485c156	1132	LodePNGInfo info_png
unix_guru	0:6b244485c156	1133	--------------------
unix_guru	0:6b244485c156	1134
unix_guru	0:6b244485c156	1135	When encoding, you use this the opposite way as when decoding: for encoding,
unix_guru	0:6b244485c156	1136	you fill in the values you want the PNG to have before encoding. By default it's
unix_guru	0:6b244485c156	1137	not needed to specify a color type for the PNG since it's automatically chosen,
unix_guru	0:6b244485c156	1138	but it's possible to choose it yourself given the right settings.
unix_guru	0:6b244485c156	1139
unix_guru	0:6b244485c156	1140	The encoder will not always exactly match the LodePNGInfo struct you give,
unix_guru	0:6b244485c156	1141	it tries as close as possible. Some things are ignored by the encoder. The
unix_guru	0:6b244485c156	1142	encoder uses, for example, the following settings from it when applicable:
unix_guru	0:6b244485c156	1143	colortype and bitdepth, text chunks, time chunk, the color key, the palette, the
unix_guru	0:6b244485c156	1144	background color, the interlace method, unknown chunks, ...
unix_guru	0:6b244485c156	1145
unix_guru	0:6b244485c156	1146	When encoding to a PNG with colortype 3, the encoder will generate a PLTE chunk.
unix_guru	0:6b244485c156	1147	If the palette contains any colors for which the alpha channel is not 255 (so
unix_guru	0:6b244485c156	1148	there are translucent colors in the palette), it'll add a tRNS chunk.
unix_guru	0:6b244485c156	1149
unix_guru	0:6b244485c156	1150	LodePNGColorMode info_raw
unix_guru	0:6b244485c156	1151	-------------------------
unix_guru	0:6b244485c156	1152
unix_guru	0:6b244485c156	1153	You specify the color type of the raw image that you give to the input here,
unix_guru	0:6b244485c156	1154	including a possible transparent color key and palette you happen to be using in
unix_guru	0:6b244485c156	1155	your raw image data.
unix_guru	0:6b244485c156	1156
unix_guru	0:6b244485c156	1157	By default, 32-bit color is assumed, meaning your input has to be in RGBA
unix_guru	0:6b244485c156	1158	format with 4 bytes (unsigned chars) per pixel.
unix_guru	0:6b244485c156	1159
unix_guru	0:6b244485c156	1160	LodePNGEncoderSettings encoder
unix_guru	0:6b244485c156	1161	------------------------------
unix_guru	0:6b244485c156	1162
unix_guru	0:6b244485c156	1163	The following settings are supported (some are in sub-structs):
unix_guru	0:6b244485c156	1164	*) auto_convert: when this option is enabled, the encoder will
unix_guru	0:6b244485c156	1165	automatically choose the smallest possible color mode (including color key) that
unix_guru	0:6b244485c156	1166	can encode the colors of all pixels without information loss.
unix_guru	0:6b244485c156	1167	*) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree,
unix_guru	0:6b244485c156	1168	2 = dynamic huffman tree (best compression). Should be 2 for proper
unix_guru	0:6b244485c156	1169	compression.
unix_guru	0:6b244485c156	1170	*) use_lz77: whether or not to use LZ77 for compressed block types. Should be
unix_guru	0:6b244485c156	1171	true for proper compression.
unix_guru	0:6b244485c156	1172	*) windowsize: the window size used by the LZ77 encoder (1 - 32768). Has value
unix_guru	0:6b244485c156	1173	2048 by default, but can be set to 32768 for better, but slow, compression.
unix_guru	0:6b244485c156	1174	*) force_palette: if colortype is 2 or 6, you can make the encoder write a PLTE
unix_guru	0:6b244485c156	1175	chunk if force_palette is true. This can used as suggested palette to convert
unix_guru	0:6b244485c156	1176	to by viewers that don't support more than 256 colors (if those still exist)
unix_guru	0:6b244485c156	1177	*) add_id: add text chunk "Encoder: LodePNG <version>" to the image.
unix_guru	0:6b244485c156	1178	*) text_compression: default 1. If 1, it'll store texts as zTXt instead of tEXt chunks.
unix_guru	0:6b244485c156	1179	zTXt chunks use zlib compression on the text. This gives a smaller result on
unix_guru	0:6b244485c156	1180	large texts but a larger result on small texts (such as a single program name).
unix_guru	0:6b244485c156	1181	It's all tEXt or all zTXt though, there's no separate setting per text yet.
unix_guru	0:6b244485c156	1182
unix_guru	0:6b244485c156	1183
unix_guru	0:6b244485c156	1184	6. color conversions
unix_guru	0:6b244485c156	1185	--------------------
unix_guru	0:6b244485c156	1186
unix_guru	0:6b244485c156	1187	An important thing to note about LodePNG, is that the color type of the PNG, and
unix_guru	0:6b244485c156	1188	the color type of the raw image, are completely independent. By default, when
unix_guru	0:6b244485c156	1189	you decode a PNG, you get the result as a raw image in the color type you want,
unix_guru	0:6b244485c156	1190	no matter whether the PNG was encoded with a palette, greyscale or RGBA color.
unix_guru	0:6b244485c156	1191	And if you encode an image, by default LodePNG will automatically choose the PNG
unix_guru	0:6b244485c156	1192	color type that gives good compression based on the values of colors and amount
unix_guru	0:6b244485c156	1193	of colors in the image. It can be configured to let you control it instead as
unix_guru	0:6b244485c156	1194	well, though.
unix_guru	0:6b244485c156	1195
unix_guru	0:6b244485c156	1196	To be able to do this, LodePNG does conversions from one color mode to another.
unix_guru	0:6b244485c156	1197	It can convert from almost any color type to any other color type, except the
unix_guru	0:6b244485c156	1198	following conversions: RGB to greyscale is not supported, and converting to a
unix_guru	0:6b244485c156	1199	palette when the palette doesn't have a required color is not supported. This is
unix_guru	0:6b244485c156	1200	not supported on purpose: this is information loss which requires a color
unix_guru	0:6b244485c156	1201	reduction algorithm that is beyong the scope of a PNG encoder (yes, RGB to grey
unix_guru	0:6b244485c156	1202	is easy, but there are multiple ways if you want to give some channels more
unix_guru	0:6b244485c156	1203	weight).
unix_guru	0:6b244485c156	1204
unix_guru	0:6b244485c156	1205	By default, when decoding, you get the raw image in 32-bit RGBA or 24-bit RGB
unix_guru	0:6b244485c156	1206	color, no matter what color type the PNG has. And by default when encoding,
unix_guru	0:6b244485c156	1207	LodePNG automatically picks the best color model for the output PNG, and expects
unix_guru	0:6b244485c156	1208	the input image to be 32-bit RGBA or 24-bit RGB. So, unless you want to control
unix_guru	0:6b244485c156	1209	the color format of the images yourself, you can skip this chapter.
unix_guru	0:6b244485c156	1210
unix_guru	0:6b244485c156	1211	6.1. PNG color types
unix_guru	0:6b244485c156	1212	--------------------
unix_guru	0:6b244485c156	1213
unix_guru	0:6b244485c156	1214	A PNG image can have many color types, ranging from 1-bit color to 64-bit color,
unix_guru	0:6b244485c156	1215	as well as palettized color modes. After the zlib decompression and unfiltering
unix_guru	0:6b244485c156	1216	in the PNG image is done, the raw pixel data will have that color type and thus
unix_guru	0:6b244485c156	1217	a certain amount of bits per pixel. If you want the output raw image after
unix_guru	0:6b244485c156	1218	decoding to have another color type, a conversion is done by LodePNG.
unix_guru	0:6b244485c156	1219
unix_guru	0:6b244485c156	1220	The PNG specification gives the following color types:
unix_guru	0:6b244485c156	1221
unix_guru	0:6b244485c156	1222	0: greyscale, bit depths 1, 2, 4, 8, 16
unix_guru	0:6b244485c156	1223	2: RGB, bit depths 8 and 16
unix_guru	0:6b244485c156	1224	3: palette, bit depths 1, 2, 4 and 8
unix_guru	0:6b244485c156	1225	4: greyscale with alpha, bit depths 8 and 16
unix_guru	0:6b244485c156	1226	6: RGBA, bit depths 8 and 16
unix_guru	0:6b244485c156	1227
unix_guru	0:6b244485c156	1228	Bit depth is the amount of bits per pixel per color channel. So the total amount
unix_guru	0:6b244485c156	1229	of bits per pixel is: amount of channels * bitdepth.
unix_guru	0:6b244485c156	1230
unix_guru	0:6b244485c156	1231	6.2. color conversions
unix_guru	0:6b244485c156	1232	----------------------
unix_guru	0:6b244485c156	1233
unix_guru	0:6b244485c156	1234	As explained in the sections about the encoder and decoder, you can specify
unix_guru	0:6b244485c156	1235	color types and bit depths in info_png and info_raw to change the default
unix_guru	0:6b244485c156	1236	behaviour.
unix_guru	0:6b244485c156	1237
unix_guru	0:6b244485c156	1238	If, when decoding, you want the raw image to be something else than the default,
unix_guru	0:6b244485c156	1239	you need to set the color type and bit depth you want in the LodePNGColorMode,
unix_guru	0:6b244485c156	1240	or the parameters colortype and bitdepth of the simple decoding function.
unix_guru	0:6b244485c156	1241
unix_guru	0:6b244485c156	1242	If, when encoding, you use another color type than the default in the raw input
unix_guru	0:6b244485c156	1243	image, you need to specify its color type and bit depth in the LodePNGColorMode
unix_guru	0:6b244485c156	1244	of the raw image, or use the parameters colortype and bitdepth of the simple
unix_guru	0:6b244485c156	1245	encoding function.
unix_guru	0:6b244485c156	1246
unix_guru	0:6b244485c156	1247	If, when encoding, you don't want LodePNG to choose the output PNG color type
unix_guru	0:6b244485c156	1248	but control it yourself, you need to set auto_convert in the encoder settings
unix_guru	0:6b244485c156	1249	to false, and specify the color type you want in the LodePNGInfo of the
unix_guru	0:6b244485c156	1250	encoder (including palette: it can generate a palette if auto_convert is true,
unix_guru	0:6b244485c156	1251	otherwise not).
unix_guru	0:6b244485c156	1252
unix_guru	0:6b244485c156	1253	If the input and output color type differ (whether user chosen or auto chosen),
unix_guru	0:6b244485c156	1254	LodePNG will do a color conversion, which follows the rules below, and may
unix_guru	0:6b244485c156	1255	sometimes result in an error.
unix_guru	0:6b244485c156	1256
unix_guru	0:6b244485c156	1257	To avoid some confusion:
unix_guru	0:6b244485c156	1258	-the decoder converts from PNG to raw image
unix_guru	0:6b244485c156	1259	-the encoder converts from raw image to PNG
unix_guru	0:6b244485c156	1260	-the colortype and bitdepth in LodePNGColorMode info_raw, are those of the raw image
unix_guru	0:6b244485c156	1261	-the colortype and bitdepth in the color field of LodePNGInfo info_png, are those of the PNG
unix_guru	0:6b244485c156	1262	-when encoding, the color type in LodePNGInfo is ignored if auto_convert
unix_guru	0:6b244485c156	1263	is enabled, it is automatically generated instead
unix_guru	0:6b244485c156	1264	-when decoding, the color type in LodePNGInfo is set by the decoder to that of the original
unix_guru	0:6b244485c156	1265	PNG image, but it can be ignored since the raw image has the color type you requested instead
unix_guru	0:6b244485c156	1266	-if the color type of the LodePNGColorMode and PNG image aren't the same, a conversion
unix_guru	0:6b244485c156	1267	between the color types is done if the color types are supported. If it is not
unix_guru	0:6b244485c156	1268	supported, an error is returned. If the types are the same, no conversion is done.
unix_guru	0:6b244485c156	1269	-even though some conversions aren't supported, LodePNG supports loading PNGs from any
unix_guru	0:6b244485c156	1270	colortype and saving PNGs to any colortype, sometimes it just requires preparing
unix_guru	0:6b244485c156	1271	the raw image correctly before encoding.
unix_guru	0:6b244485c156	1272	-both encoder and decoder use the same color converter.
unix_guru	0:6b244485c156	1273
unix_guru	0:6b244485c156	1274	Non supported color conversions:
unix_guru	0:6b244485c156	1275	-color to greyscale: no error is thrown, but the result will look ugly because
unix_guru	0:6b244485c156	1276	only the red channel is taken
unix_guru	0:6b244485c156	1277	-anything to palette when that palette does not have that color in it: in this
unix_guru	0:6b244485c156	1278	case an error is thrown
unix_guru	0:6b244485c156	1279
unix_guru	0:6b244485c156	1280	Supported color conversions:
unix_guru	0:6b244485c156	1281	-anything to 8-bit RGB, 8-bit RGBA, 16-bit RGB, 16-bit RGBA
unix_guru	0:6b244485c156	1282	-any grey or grey+alpha, to grey or grey+alpha
unix_guru	0:6b244485c156	1283	-anything to a palette, as long as the palette has the requested colors in it
unix_guru	0:6b244485c156	1284	-removing alpha channel
unix_guru	0:6b244485c156	1285	-higher to smaller bitdepth, and vice versa
unix_guru	0:6b244485c156	1286
unix_guru	0:6b244485c156	1287	If you want no color conversion to be done (e.g. for speed or control):
unix_guru	0:6b244485c156	1288	-In the encoder, you can make it save a PNG with any color type by giving the
unix_guru	0:6b244485c156	1289	raw color mode and LodePNGInfo the same color mode, and setting auto_convert to
unix_guru	0:6b244485c156	1290	false.
unix_guru	0:6b244485c156	1291	-In the decoder, you can make it store the pixel data in the same color type
unix_guru	0:6b244485c156	1292	as the PNG has, by setting the color_convert setting to false. Settings in
unix_guru	0:6b244485c156	1293	info_raw are then ignored.
unix_guru	0:6b244485c156	1294
unix_guru	0:6b244485c156	1295	The function lodepng_convert does the color conversion. It is available in the
unix_guru	0:6b244485c156	1296	interface but normally isn't needed since the encoder and decoder already call
unix_guru	0:6b244485c156	1297	it.
unix_guru	0:6b244485c156	1298
unix_guru	0:6b244485c156	1299	6.3. padding bits
unix_guru	0:6b244485c156	1300	-----------------
unix_guru	0:6b244485c156	1301
unix_guru	0:6b244485c156	1302	In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines
unix_guru	0:6b244485c156	1303	have a bit amount that isn't a multiple of 8, then padding bits are used so that each
unix_guru	0:6b244485c156	1304	scanline starts at a fresh byte. But that is NOT true for the LodePNG raw input and output.
unix_guru	0:6b244485c156	1305	The raw input image you give to the encoder, and the raw output image you get from the decoder
unix_guru	0:6b244485c156	1306	will NOT have these padding bits, e.g. in the case of a 1-bit image with a width
unix_guru	0:6b244485c156	1307	of 7 pixels, the first pixel of the second scanline will the the 8th bit of the first byte,
unix_guru	0:6b244485c156	1308	not the first bit of a new byte.
unix_guru	0:6b244485c156	1309
unix_guru	0:6b244485c156	1310	6.4. A note about 16-bits per channel and endianness
unix_guru	0:6b244485c156	1311	----------------------------------------------------
unix_guru	0:6b244485c156	1312
unix_guru	0:6b244485c156	1313	LodePNG uses unsigned char arrays for 16-bit per channel colors too, just like
unix_guru	0:6b244485c156	1314	for any other color format. The 16-bit values are stored in big endian (most
unix_guru	0:6b244485c156	1315	significant byte first) in these arrays. This is the opposite order of the
unix_guru	0:6b244485c156	1316	little endian used by x86 CPU's.
unix_guru	0:6b244485c156	1317
unix_guru	0:6b244485c156	1318	LodePNG always uses big endian because the PNG file format does so internally.
unix_guru	0:6b244485c156	1319	Conversions to other formats than PNG uses internally are not supported by
unix_guru	0:6b244485c156	1320	LodePNG on purpose, there are myriads of formats, including endianness of 16-bit
unix_guru	0:6b244485c156	1321	colors, the order in which you store R, G, B and A, and so on. Supporting and
unix_guru	0:6b244485c156	1322	converting to/from all that is outside the scope of LodePNG.
unix_guru	0:6b244485c156	1323
unix_guru	0:6b244485c156	1324	This may mean that, depending on your use case, you may want to convert the big
unix_guru	0:6b244485c156	1325	endian output of LodePNG to little endian with a for loop. This is certainly not
unix_guru	0:6b244485c156	1326	always needed, many applications and libraries support big endian 16-bit colors
unix_guru	0:6b244485c156	1327	anyway, but it means you cannot simply cast the unsigned char* buffer to an
unix_guru	0:6b244485c156	1328	unsigned short* buffer on x86 CPUs.
unix_guru	0:6b244485c156	1329
unix_guru	0:6b244485c156	1330
unix_guru	0:6b244485c156	1331	7. error values
unix_guru	0:6b244485c156	1332	---------------
unix_guru	0:6b244485c156	1333
unix_guru	0:6b244485c156	1334	All functions in LodePNG that return an error code, return 0 if everything went
unix_guru	0:6b244485c156	1335	OK, or a non-zero code if there was an error.
unix_guru	0:6b244485c156	1336
unix_guru	0:6b244485c156	1337	The meaning of the LodePNG error values can be retrieved with the function
unix_guru	0:6b244485c156	1338	lodepng_error_text: given the numerical error code, it returns a description
unix_guru	0:6b244485c156	1339	of the error in English as a string.
unix_guru	0:6b244485c156	1340
unix_guru	0:6b244485c156	1341	Check the implementation of lodepng_error_text to see the meaning of each code.
unix_guru	0:6b244485c156	1342
unix_guru	0:6b244485c156	1343
unix_guru	0:6b244485c156	1344	8. chunks and PNG editing
unix_guru	0:6b244485c156	1345	-------------------------
unix_guru	0:6b244485c156	1346
unix_guru	0:6b244485c156	1347	If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG
unix_guru	0:6b244485c156	1348	editor that should follow the rules about handling of unknown chunks, or if your
unix_guru	0:6b244485c156	1349	program is able to read other types of chunks than the ones handled by LodePNG,
unix_guru	0:6b244485c156	1350	then that's possible with the chunk functions of LodePNG.
unix_guru	0:6b244485c156	1351
unix_guru	0:6b244485c156	1352	A PNG chunk has the following layout:
unix_guru	0:6b244485c156	1353
unix_guru	0:6b244485c156	1354	4 bytes length
unix_guru	0:6b244485c156	1355	4 bytes type name
unix_guru	0:6b244485c156	1356	length bytes data
unix_guru	0:6b244485c156	1357	4 bytes CRC
unix_guru	0:6b244485c156	1358
unix_guru	0:6b244485c156	1359	8.1. iterating through chunks
unix_guru	0:6b244485c156	1360	-----------------------------
unix_guru	0:6b244485c156	1361
unix_guru	0:6b244485c156	1362	If you have a buffer containing the PNG image data, then the first chunk (the
unix_guru	0:6b244485c156	1363	IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the
unix_guru	0:6b244485c156	1364	signature of the PNG and are not part of a chunk. But if you start at byte 8
unix_guru	0:6b244485c156	1365	then you have a chunk, and can check the following things of it.
unix_guru	0:6b244485c156	1366
unix_guru	0:6b244485c156	1367	NOTE: none of these functions check for memory buffer boundaries. To avoid
unix_guru	0:6b244485c156	1368	exploits, always make sure the buffer contains all the data of the chunks.
unix_guru	0:6b244485c156	1369	When using lodepng_chunk_next, make sure the returned value is within the
unix_guru	0:6b244485c156	1370	allocated memory.
unix_guru	0:6b244485c156	1371
unix_guru	0:6b244485c156	1372	unsigned lodepng_chunk_length(const unsigned char* chunk):
unix_guru	0:6b244485c156	1373
unix_guru	0:6b244485c156	1374	Get the length of the chunk's data. The total chunk length is this length + 12.
unix_guru	0:6b244485c156	1375
unix_guru	0:6b244485c156	1376	void lodepng_chunk_type(char type[5], const unsigned char* chunk):
unix_guru	0:6b244485c156	1377	unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type):
unix_guru	0:6b244485c156	1378
unix_guru	0:6b244485c156	1379	Get the type of the chunk or compare if it's a certain type
unix_guru	0:6b244485c156	1380
unix_guru	0:6b244485c156	1381	unsigned char lodepng_chunk_critical(const unsigned char* chunk):
unix_guru	0:6b244485c156	1382	unsigned char lodepng_chunk_private(const unsigned char* chunk):
unix_guru	0:6b244485c156	1383	unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk):
unix_guru	0:6b244485c156	1384
unix_guru	0:6b244485c156	1385	Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are).
unix_guru	0:6b244485c156	1386	Check if the chunk is private (public chunks are part of the standard, private ones not).
unix_guru	0:6b244485c156	1387	Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical
unix_guru	0:6b244485c156	1388	chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your
unix_guru	0:6b244485c156	1389	program doesn't handle that type of unknown chunk.
unix_guru	0:6b244485c156	1390
unix_guru	0:6b244485c156	1391	unsigned char* lodepng_chunk_data(unsigned char* chunk):
unix_guru	0:6b244485c156	1392	const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk):
unix_guru	0:6b244485c156	1393
unix_guru	0:6b244485c156	1394	Get a pointer to the start of the data of the chunk.
unix_guru	0:6b244485c156	1395
unix_guru	0:6b244485c156	1396	unsigned lodepng_chunk_check_crc(const unsigned char* chunk):
unix_guru	0:6b244485c156	1397	void lodepng_chunk_generate_crc(unsigned char* chunk):
unix_guru	0:6b244485c156	1398
unix_guru	0:6b244485c156	1399	Check if the crc is correct or generate a correct one.
unix_guru	0:6b244485c156	1400
unix_guru	0:6b244485c156	1401	unsigned char* lodepng_chunk_next(unsigned char* chunk):
unix_guru	0:6b244485c156	1402	const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk):
unix_guru	0:6b244485c156	1403
unix_guru	0:6b244485c156	1404	Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these
unix_guru	0:6b244485c156	1405	functions do no boundary checking of the allocated data whatsoever, so make sure there is enough
unix_guru	0:6b244485c156	1406	data available in the buffer to be able to go to the next chunk.
unix_guru	0:6b244485c156	1407
unix_guru	0:6b244485c156	1408	unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk):
unix_guru	0:6b244485c156	1409	unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length,
unix_guru	0:6b244485c156	1410	const char* type, const unsigned char* data):
unix_guru	0:6b244485c156	1411
unix_guru	0:6b244485c156	1412	These functions are used to create new chunks that are appended to the data in *out that has
unix_guru	0:6b244485c156	1413	length *outlength. The append function appends an existing chunk to the new data. The create
unix_guru	0:6b244485c156	1414	function creates a new chunk with the given parameters and appends it. Type is the 4-letter
unix_guru	0:6b244485c156	1415	name of the chunk.
unix_guru	0:6b244485c156	1416
unix_guru	0:6b244485c156	1417	8.2. chunks in info_png
unix_guru	0:6b244485c156	1418	-----------------------
unix_guru	0:6b244485c156	1419
unix_guru	0:6b244485c156	1420	The LodePNGInfo struct contains fields with the unknown chunk in it. It has 3
unix_guru	0:6b244485c156	1421	buffers (each with size) to contain 3 types of unknown chunks:
unix_guru	0:6b244485c156	1422	the ones that come before the PLTE chunk, the ones that come between the PLTE
unix_guru	0:6b244485c156	1423	and the IDAT chunks, and the ones that come after the IDAT chunks.
unix_guru	0:6b244485c156	1424	It's necessary to make the distionction between these 3 cases because the PNG
unix_guru	0:6b244485c156	1425	standard forces to keep the ordering of unknown chunks compared to the critical
unix_guru	0:6b244485c156	1426	chunks, but does not force any other ordering rules.
unix_guru	0:6b244485c156	1427
unix_guru	0:6b244485c156	1428	info_png.unknown_chunks_data[0] is the chunks before PLTE
unix_guru	0:6b244485c156	1429	info_png.unknown_chunks_data[1] is the chunks after PLTE, before IDAT
unix_guru	0:6b244485c156	1430	info_png.unknown_chunks_data[2] is the chunks after IDAT
unix_guru	0:6b244485c156	1431
unix_guru	0:6b244485c156	1432	The chunks in these 3 buffers can be iterated through and read by using the same
unix_guru	0:6b244485c156	1433	way described in the previous subchapter.
unix_guru	0:6b244485c156	1434
unix_guru	0:6b244485c156	1435	When using the decoder to decode a PNG, you can make it store all unknown chunks
unix_guru	0:6b244485c156	1436	if you set the option settings.remember_unknown_chunks to 1. By default, this
unix_guru	0:6b244485c156	1437	option is off (0).
unix_guru	0:6b244485c156	1438
unix_guru	0:6b244485c156	1439	The encoder will always encode unknown chunks that are stored in the info_png.
unix_guru	0:6b244485c156	1440	If you need it to add a particular chunk that isn't known by LodePNG, you can
unix_guru	0:6b244485c156	1441	use lodepng_chunk_append or lodepng_chunk_create to the chunk data in
unix_guru	0:6b244485c156	1442	info_png.unknown_chunks_data[x].
unix_guru	0:6b244485c156	1443
unix_guru	0:6b244485c156	1444	Chunks that are known by LodePNG should not be added in that way. E.g. to make
unix_guru	0:6b244485c156	1445	LodePNG add a bKGD chunk, set background_defined to true and add the correct
unix_guru	0:6b244485c156	1446	parameters there instead.
unix_guru	0:6b244485c156	1447
unix_guru	0:6b244485c156	1448
unix_guru	0:6b244485c156	1449	9. compiler support
unix_guru	0:6b244485c156	1450	-------------------
unix_guru	0:6b244485c156	1451
unix_guru	0:6b244485c156	1452	No libraries other than the current standard C library are needed to compile
unix_guru	0:6b244485c156	1453	LodePNG. For the C++ version, only the standard C++ library is needed on top.
unix_guru	0:6b244485c156	1454	Add the files lodepng.c(pp) and lodepng.h to your project, include
unix_guru	0:6b244485c156	1455	lodepng.h where needed, and your program can read/write PNG files.
unix_guru	0:6b244485c156	1456
unix_guru	0:6b244485c156	1457	It is compatible with C90 and up, and C++03 and up.
unix_guru	0:6b244485c156	1458
unix_guru	0:6b244485c156	1459	If performance is important, use optimization when compiling! For both the
unix_guru	0:6b244485c156	1460	encoder and decoder, this makes a large difference.
unix_guru	0:6b244485c156	1461
unix_guru	0:6b244485c156	1462	Make sure that LodePNG is compiled with the same compiler of the same version
unix_guru	0:6b244485c156	1463	and with the same settings as the rest of the program, or the interfaces with
unix_guru	0:6b244485c156	1464	std::vectors and std::strings in C++ can be incompatible.
unix_guru	0:6b244485c156	1465
unix_guru	0:6b244485c156	1466	CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets.
unix_guru	0:6b244485c156	1467
unix_guru	0:6b244485c156	1468	*) gcc and g++
unix_guru	0:6b244485c156	1469
unix_guru	0:6b244485c156	1470	LodePNG is developed in gcc so this compiler is natively supported. It gives no
unix_guru	0:6b244485c156	1471	warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++
unix_guru	0:6b244485c156	1472	version 4.7.1 on Linux, 32-bit and 64-bit.
unix_guru	0:6b244485c156	1473
unix_guru	0:6b244485c156	1474	*) Clang
unix_guru	0:6b244485c156	1475
unix_guru	0:6b244485c156	1476	Fully supported and warning-free.
unix_guru	0:6b244485c156	1477
unix_guru	0:6b244485c156	1478	*) Mingw
unix_guru	0:6b244485c156	1479
unix_guru	0:6b244485c156	1480	The Mingw compiler (a port of gcc for Windows) should be fully supported by
unix_guru	0:6b244485c156	1481	LodePNG.
unix_guru	0:6b244485c156	1482
unix_guru	0:6b244485c156	1483	*) Visual Studio and Visual C++ Express Edition
unix_guru	0:6b244485c156	1484
unix_guru	0:6b244485c156	1485	LodePNG should be warning-free with warning level W4. Two warnings were disabled
unix_guru	0:6b244485c156	1486	with pragmas though: warning 4244 about implicit conversions, and warning 4996
unix_guru	0:6b244485c156	1487	where it wants to use a non-standard function fopen_s instead of the standard C
unix_guru	0:6b244485c156	1488	fopen.
unix_guru	0:6b244485c156	1489
unix_guru	0:6b244485c156	1490	Visual Studio may want "stdafx.h" files to be included in each source file and
unix_guru	0:6b244485c156	1491	give an error "unexpected end of file while looking for precompiled header".
unix_guru	0:6b244485c156	1492	This is not standard C++ and will not be added to the stock LodePNG. You can
unix_guru	0:6b244485c156	1493	disable it for lodepng.cpp only by right clicking it, Properties, C/C++,
unix_guru	0:6b244485c156	1494	Precompiled Headers, and set it to Not Using Precompiled Headers there.
unix_guru	0:6b244485c156	1495
unix_guru	0:6b244485c156	1496	NOTE: Modern versions of VS should be fully supported, but old versions, e.g.
unix_guru	0:6b244485c156	1497	VS6, are not guaranteed to work.
unix_guru	0:6b244485c156	1498
unix_guru	0:6b244485c156	1499	*) Compilers on Macintosh
unix_guru	0:6b244485c156	1500
unix_guru	0:6b244485c156	1501	LodePNG has been reported to work both with gcc and LLVM for Macintosh, both for
unix_guru	0:6b244485c156	1502	C and C++.
unix_guru	0:6b244485c156	1503
unix_guru	0:6b244485c156	1504	*) Other Compilers
unix_guru	0:6b244485c156	1505
unix_guru	0:6b244485c156	1506	If you encounter problems on any compilers, feel free to let me know and I may
unix_guru	0:6b244485c156	1507	try to fix it if the compiler is modern and standards complient.
unix_guru	0:6b244485c156	1508
unix_guru	0:6b244485c156	1509
unix_guru	0:6b244485c156	1510	10. examples
unix_guru	0:6b244485c156	1511	------------
unix_guru	0:6b244485c156	1512
unix_guru	0:6b244485c156	1513	This decoder example shows the most basic usage of LodePNG. More complex
unix_guru	0:6b244485c156	1514	examples can be found on the LodePNG website.
unix_guru	0:6b244485c156	1515
unix_guru	0:6b244485c156	1516	10.1. decoder C++ example
unix_guru	0:6b244485c156	1517	-------------------------
unix_guru	0:6b244485c156	1518
unix_guru	0:6b244485c156	1519	#include "lodepng.h"
unix_guru	0:6b244485c156	1520	#include <iostream>
unix_guru	0:6b244485c156	1521
unix_guru	0:6b244485c156	1522	int main(int argc, char *argv[])
unix_guru	0:6b244485c156	1523	{
unix_guru	0:6b244485c156	1524	const char* filename = argc > 1 ? argv[1] : "test.png";
unix_guru	0:6b244485c156	1525
unix_guru	0:6b244485c156	1526	//load and decode
unix_guru	0:6b244485c156	1527	std::vector<unsigned char> image;
unix_guru	0:6b244485c156	1528	unsigned width, height;
unix_guru	0:6b244485c156	1529	unsigned error = lodepng::decode(image, width, height, filename);
unix_guru	0:6b244485c156	1530
unix_guru	0:6b244485c156	1531	//if there's an error, display it
unix_guru	0:6b244485c156	1532	if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl;
unix_guru	0:6b244485c156	1533
unix_guru	0:6b244485c156	1534	//the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...
unix_guru	0:6b244485c156	1535	}
unix_guru	0:6b244485c156	1536
unix_guru	0:6b244485c156	1537	10.2. decoder C example
unix_guru	0:6b244485c156	1538	-----------------------
unix_guru	0:6b244485c156	1539
unix_guru	0:6b244485c156	1540	#include "lodepng.h"
unix_guru	0:6b244485c156	1541
unix_guru	0:6b244485c156	1542	int main(int argc, char *argv[])
unix_guru	0:6b244485c156	1543	{
unix_guru	0:6b244485c156	1544	unsigned error;
unix_guru	0:6b244485c156	1545	unsigned char* image;
unix_guru	0:6b244485c156	1546	size_t width, height;
unix_guru	0:6b244485c156	1547	const char* filename = argc > 1 ? argv[1] : "test.png";
unix_guru	0:6b244485c156	1548
unix_guru	0:6b244485c156	1549	error = lodepng_decode32_file(&image, &width, &height, filename);
unix_guru	0:6b244485c156	1550
unix_guru	0:6b244485c156	1551	if(error) printf("decoder error %u: %s\n", error, lodepng_error_text(error));
unix_guru	0:6b244485c156	1552
unix_guru	0:6b244485c156	1553	/ * use image here * /
unix_guru	0:6b244485c156	1554
unix_guru	0:6b244485c156	1555	free(image);
unix_guru	0:6b244485c156	1556	return 0;
unix_guru	0:6b244485c156	1557	}
unix_guru	0:6b244485c156	1558
unix_guru	0:6b244485c156	1559	11. state settings reference
unix_guru	0:6b244485c156	1560	----------------------------
unix_guru	0:6b244485c156	1561
unix_guru	0:6b244485c156	1562	A quick reference of some settings to set on the LodePNGState
unix_guru	0:6b244485c156	1563
unix_guru	0:6b244485c156	1564	For decoding:
unix_guru	0:6b244485c156	1565
unix_guru	0:6b244485c156	1566	state.decoder.zlibsettings.ignore_adler32: ignore ADLER32 checksums
unix_guru	0:6b244485c156	1567	state.decoder.zlibsettings.custom_...: use custom inflate function
unix_guru	0:6b244485c156	1568	state.decoder.ignore_crc: ignore CRC checksums
unix_guru	0:6b244485c156	1569	state.decoder.color_convert: convert internal PNG color to chosen one
unix_guru	0:6b244485c156	1570	state.decoder.read_text_chunks: whether to read in text metadata chunks
unix_guru	0:6b244485c156	1571	state.decoder.remember_unknown_chunks: whether to read in unknown chunks
unix_guru	0:6b244485c156	1572	state.info_raw.colortype: desired color type for decoded image
unix_guru	0:6b244485c156	1573	state.info_raw.bitdepth: desired bit depth for decoded image
unix_guru	0:6b244485c156	1574	state.info_raw....: more color settings, see struct LodePNGColorMode
unix_guru	0:6b244485c156	1575	state.info_png....: no settings for decoder but ouput, see struct LodePNGInfo
unix_guru	0:6b244485c156	1576
unix_guru	0:6b244485c156	1577	For encoding:
unix_guru	0:6b244485c156	1578
unix_guru	0:6b244485c156	1579	state.encoder.zlibsettings.btype: disable compression by setting it to 0
unix_guru	0:6b244485c156	1580	state.encoder.zlibsettings.use_lz77: use LZ77 in compression
unix_guru	0:6b244485c156	1581	state.encoder.zlibsettings.windowsize: tweak LZ77 windowsize
unix_guru	0:6b244485c156	1582	state.encoder.zlibsettings.minmatch: tweak min LZ77 length to match
unix_guru	0:6b244485c156	1583	state.encoder.zlibsettings.nicematch: tweak LZ77 match where to stop searching
unix_guru	0:6b244485c156	1584	state.encoder.zlibsettings.lazymatching: try one more LZ77 matching
unix_guru	0:6b244485c156	1585	state.encoder.zlibsettings.custom_...: use custom deflate function
unix_guru	0:6b244485c156	1586	state.encoder.auto_convert: choose optimal PNG color type, if 0 uses info_png
unix_guru	0:6b244485c156	1587	state.encoder.filter_palette_zero: PNG filter strategy for palette
unix_guru	0:6b244485c156	1588	state.encoder.filter_strategy: PNG filter strategy to encode with
unix_guru	0:6b244485c156	1589	state.encoder.force_palette: add palette even if not encoding to one
unix_guru	0:6b244485c156	1590	state.encoder.add_id: add LodePNG identifier and version as a text chunk
unix_guru	0:6b244485c156	1591	state.encoder.text_compression: use compressed text chunks for metadata
unix_guru	0:6b244485c156	1592	state.info_raw.colortype: color type of raw input image you provide
unix_guru	0:6b244485c156	1593	state.info_raw.bitdepth: bit depth of raw input image you provide
unix_guru	0:6b244485c156	1594	state.info_raw: more color settings, see struct LodePNGColorMode
unix_guru	0:6b244485c156	1595	state.info_png.color.colortype: desired color type if auto_convert is false
unix_guru	0:6b244485c156	1596	state.info_png.color.bitdepth: desired bit depth if auto_convert is false
unix_guru	0:6b244485c156	1597	state.info_png.color....: more color settings, see struct LodePNGColorMode
unix_guru	0:6b244485c156	1598	state.info_png....: more PNG related settings, see struct LodePNGInfo
unix_guru	0:6b244485c156	1599
unix_guru	0:6b244485c156	1600
unix_guru	0:6b244485c156	1601	12. changes
unix_guru	0:6b244485c156	1602	-----------
unix_guru	0:6b244485c156	1603
unix_guru	0:6b244485c156	1604	The version number of LodePNG is the date of the change given in the format
unix_guru	0:6b244485c156	1605	yyyymmdd.
unix_guru	0:6b244485c156	1606
unix_guru	0:6b244485c156	1607	Some changes aren't backwards compatible. Those are indicated with a (!)
unix_guru	0:6b244485c156	1608	symbol.
unix_guru	0:6b244485c156	1609
unix_guru	0:6b244485c156	1610	*) 08 dec 2015: Made load_file function return error if file can't be opened.
unix_guru	0:6b244485c156	1611	*) 24 okt 2015: Bugfix with decoding to palette output.
unix_guru	0:6b244485c156	1612	*) 18 apr 2015: Boundary PM instead of just package-merge for faster encoding.
unix_guru	0:6b244485c156	1613	*) 23 aug 2014: Reduced needless memory usage of decoder.
unix_guru	0:6b244485c156	1614	*) 28 jun 2014: Removed fix_png setting, always support palette OOB for
unix_guru	0:6b244485c156	1615	simplicity. Made ColorProfile public.
unix_guru	0:6b244485c156	1616	*) 09 jun 2014: Faster encoder by fixing hash bug and more zeros optimization.
unix_guru	0:6b244485c156	1617	*) 22 dec 2013: Power of two windowsize required for optimization.
unix_guru	0:6b244485c156	1618	*) 15 apr 2013: Fixed bug with LAC_ALPHA and color key.
unix_guru	0:6b244485c156	1619	*) 25 mar 2013: Added an optional feature to ignore some PNG errors (fix_png).
unix_guru	0:6b244485c156	1620	*) 11 mar 2013 (!): Bugfix with custom free. Changed from "my" to "lodepng_"
unix_guru	0:6b244485c156	1621	prefix for the custom allocators and made it possible with a new #define to
unix_guru	0:6b244485c156	1622	use custom ones in your project without needing to change lodepng's code.
unix_guru	0:6b244485c156	1623	*) 28 jan 2013: Bugfix with color key.
unix_guru	0:6b244485c156	1624	*) 27 okt 2012: Tweaks in text chunk keyword length error handling.
unix_guru	0:6b244485c156	1625	*) 8 okt 2012 (!): Added new filter strategy (entropy) and new auto color mode.
unix_guru	0:6b244485c156	1626	(no palette). Better deflate tree encoding. New compression tweak settings.
unix_guru	0:6b244485c156	1627	Faster color conversions while decoding. Some internal cleanups.
unix_guru	0:6b244485c156	1628	*) 23 sep 2012: Reduced warnings in Visual Studio a little bit.
unix_guru	0:6b244485c156	1629	*) 1 sep 2012 (!): Removed #define's for giving custom (de)compression functions
unix_guru	0:6b244485c156	1630	and made it work with function pointers instead.
unix_guru	0:6b244485c156	1631	*) 23 jun 2012: Added more filter strategies. Made it easier to use custom alloc
unix_guru	0:6b244485c156	1632	and free functions and toggle #defines from compiler flags. Small fixes.
unix_guru	0:6b244485c156	1633	*) 6 may 2012 (!): Made plugging in custom zlib/deflate functions more flexible.
unix_guru	0:6b244485c156	1634	*) 22 apr 2012 (!): Made interface more consistent, renaming a lot. Removed
unix_guru	0:6b244485c156	1635	redundant C++ codec classes. Reduced amount of structs. Everything changed,
unix_guru	0:6b244485c156	1636	but it is cleaner now imho and functionality remains the same. Also fixed
unix_guru	0:6b244485c156	1637	several bugs and shrunk the implementation code. Made new samples.
unix_guru	0:6b244485c156	1638	*) 6 nov 2011 (!): By default, the encoder now automatically chooses the best
unix_guru	0:6b244485c156	1639	PNG color model and bit depth, based on the amount and type of colors of the
unix_guru	0:6b244485c156	1640	raw image. For this, autoLeaveOutAlphaChannel replaced by auto_choose_color.
unix_guru	0:6b244485c156	1641	*) 9 okt 2011: simpler hash chain implementation for the encoder.
unix_guru	0:6b244485c156	1642	*) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching.
unix_guru	0:6b244485c156	1643	*) 23 aug 2011: tweaked the zlib compression parameters after benchmarking.
unix_guru	0:6b244485c156	1644	A bug with the PNG filtertype heuristic was fixed, so that it chooses much
unix_guru	0:6b244485c156	1645	better ones (it's quite significant). A setting to do an experimental, slow,
unix_guru	0:6b244485c156	1646	brute force search for PNG filter types is added.
unix_guru	0:6b244485c156	1647	*) 17 aug 2011 (!): changed some C zlib related function names.
unix_guru	0:6b244485c156	1648	*) 16 aug 2011: made the code less wide (max 120 characters per line).
unix_guru	0:6b244485c156	1649	*) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors.
unix_guru	0:6b244485c156	1650	*) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled.
unix_guru	0:6b244485c156	1651	*) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman
unix_guru	0:6b244485c156	1652	to optimize long sequences of zeros.
unix_guru	0:6b244485c156	1653	*) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and
unix_guru	0:6b244485c156	1654	LodePNG_InfoColor_canHaveAlpha functions for convenience.
unix_guru	0:6b244485c156	1655	*) 7 nov 2010: added LodePNG_error_text function to get error code description.
unix_guru	0:6b244485c156	1656	*) 30 okt 2010: made decoding slightly faster
unix_guru	0:6b244485c156	1657	*) 26 okt 2010: (!) changed some C function and struct names (more consistent).
unix_guru	0:6b244485c156	1658	Reorganized the documentation and the declaration order in the header.
unix_guru	0:6b244485c156	1659	*) 08 aug 2010: only changed some comments and external samples.
unix_guru	0:6b244485c156	1660	*) 05 jul 2010: fixed bug thanks to warnings in the new gcc version.
unix_guru	0:6b244485c156	1661	*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers.
unix_guru	0:6b244485c156	1662	*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could
unix_guru	0:6b244485c156	1663	read by ignoring the problem but windows apps couldn't.
unix_guru	0:6b244485c156	1664	*) 06 jun 2008: added more error checks for out of memory cases.
unix_guru	0:6b244485c156	1665	*) 26 apr 2008: added a few more checks here and there to ensure more safety.
unix_guru	0:6b244485c156	1666	*) 06 mar 2008: crash with encoding of strings fixed
unix_guru	0:6b244485c156	1667	*) 02 feb 2008: support for international text chunks added (iTXt)
unix_guru	0:6b244485c156	1668	*) 23 jan 2008: small cleanups, and #defines to divide code in sections
unix_guru	0:6b244485c156	1669	*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor.
unix_guru	0:6b244485c156	1670	*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder.
unix_guru	0:6b244485c156	1671	*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added
unix_guru	0:6b244485c156	1672	Also various fixes, such as in the deflate and the padding bits code.
unix_guru	0:6b244485c156	1673	*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved
unix_guru	0:6b244485c156	1674	filtering code of encoder.
unix_guru	0:6b244485c156	1675	*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A
unix_guru	0:6b244485c156	1676	C++ wrapper around this provides an interface almost identical to before.
unix_guru	0:6b244485c156	1677	Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code
unix_guru	0:6b244485c156	1678	are together in these files but it works both for C and C++ compilers.
unix_guru	0:6b244485c156	1679	*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks
unix_guru	0:6b244485c156	1680	*) 30 aug 2007: bug fixed which makes this Borland C++ compatible
unix_guru	0:6b244485c156	1681	*) 09 aug 2007: some VS2005 warnings removed again
unix_guru	0:6b244485c156	1682	*) 21 jul 2007: deflate code placed in new namespace separate from zlib code
unix_guru	0:6b244485c156	1683	*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images
unix_guru	0:6b244485c156	1684	*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing
unix_guru	0:6b244485c156	1685	invalid std::vector element [0] fixed, and level 3 and 4 warnings removed
unix_guru	0:6b244485c156	1686	*) 02 jun 2007: made the encoder add a tag with version by default
unix_guru	0:6b244485c156	1687	*) 27 may 2007: zlib and png code separated (but still in the same file),
unix_guru	0:6b244485c156	1688	simple encoder/decoder functions added for more simple usage cases
unix_guru	0:6b244485c156	1689	*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69),
unix_guru	0:6b244485c156	1690	moved some examples from here to lodepng_examples.cpp
unix_guru	0:6b244485c156	1691	*) 12 may 2007: palette decoding bug fixed
unix_guru	0:6b244485c156	1692	*) 24 apr 2007: changed the license from BSD to the zlib license
unix_guru	0:6b244485c156	1693	*) 11 mar 2007: very simple addition: ability to encode bKGD chunks.
unix_guru	0:6b244485c156	1694	*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding
unix_guru	0:6b244485c156	1695	palettized PNG images. Plus little interface change with palette and texts.
unix_guru	0:6b244485c156	1696	*) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes.
unix_guru	0:6b244485c156	1697	Fixed a bug where the end code of a block had length 0 in the Huffman tree.
unix_guru	0:6b244485c156	1698	*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented
unix_guru	0:6b244485c156	1699	and supported by the encoder, resulting in smaller PNGs at the output.
unix_guru	0:6b244485c156	1700	*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone.
unix_guru	0:6b244485c156	1701	*) 24 jan 2007: gave encoder an error interface. Added color conversion from any
unix_guru	0:6b244485c156	1702	greyscale type to 8-bit greyscale with or without alpha.
unix_guru	0:6b244485c156	1703	*) 21 jan 2007: (!) Totally changed the interface. It allows more color types
unix_guru	0:6b244485c156	1704	to convert to and is more uniform. See the manual for how it works now.
unix_guru	0:6b244485c156	1705	*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days:
unix_guru	0:6b244485c156	1706	encode/decode custom tEXt chunks, separate classes for zlib & deflate, and
unix_guru	0:6b244485c156	1707	at last made the decoder give errors for incorrect Adler32 or Crc.
unix_guru	0:6b244485c156	1708	*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel.
unix_guru	0:6b244485c156	1709	*) 29 dec 2006: Added support for encoding images without alpha channel, and
unix_guru	0:6b244485c156	1710	cleaned out code as well as making certain parts faster.
unix_guru	0:6b244485c156	1711	*) 28 dec 2006: Added "Settings" to the encoder.
unix_guru	0:6b244485c156	1712	*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now.
unix_guru	0:6b244485c156	1713	Removed some code duplication in the decoder. Fixed little bug in an example.
unix_guru	0:6b244485c156	1714	*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter.
unix_guru	0:6b244485c156	1715	Fixed a bug of the decoder with 16-bit per color.
unix_guru	0:6b244485c156	1716	*) 15 okt 2006: Changed documentation structure
unix_guru	0:6b244485c156	1717	*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the
unix_guru	0:6b244485c156	1718	given image buffer, however for now it's not compressed.
unix_guru	0:6b244485c156	1719	*) 08 sep 2006: (!) Changed to interface with a Decoder class
unix_guru	0:6b244485c156	1720	*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different
unix_guru	0:6b244485c156	1721	way. Renamed decodePNG to decodePNGGeneric.
unix_guru	0:6b244485c156	1722	*) 29 jul 2006: (!) Changed the interface: image info is now returned as a
unix_guru	0:6b244485c156	1723	struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy.
unix_guru	0:6b244485c156	1724	*) 28 jul 2006: Cleaned the code and added new error checks.
unix_guru	0:6b244485c156	1725	Corrected terminology "deflate" into "inflate".
unix_guru	0:6b244485c156	1726	*) 23 jun 2006: Added SDL example in the documentation in the header, this
unix_guru	0:6b244485c156	1727	example allows easy debugging by displaying the PNG and its transparency.
unix_guru	0:6b244485c156	1728	*) 22 jun 2006: (!) Changed way to obtain error value. Added
unix_guru	0:6b244485c156	1729	loadFile function for convenience. Made decodePNG32 faster.
unix_guru	0:6b244485c156	1730	*) 21 jun 2006: (!) Changed type of info vector to unsigned.
unix_guru	0:6b244485c156	1731	Changed position of palette in info vector. Fixed an important bug that
unix_guru	0:6b244485c156	1732	happened on PNGs with an uncompressed block.
unix_guru	0:6b244485c156	1733	*) 16 jun 2006: Internally changed unsigned into unsigned where
unix_guru	0:6b244485c156	1734	needed, and performed some optimizations.
unix_guru	0:6b244485c156	1735	*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them
unix_guru	0:6b244485c156	1736	in LodePNG namespace. Changed the order of the parameters. Rewrote the
unix_guru	0:6b244485c156	1737	documentation in the header. Renamed files to lodepng.cpp and lodepng.h
unix_guru	0:6b244485c156	1738	*) 22 apr 2006: Optimized and improved some code
unix_guru	0:6b244485c156	1739	*) 07 sep 2005: (!) Changed to std::vector interface
unix_guru	0:6b244485c156	1740	*) 12 aug 2005: Initial release (C++, decoder only)
unix_guru	0:6b244485c156	1741
unix_guru	0:6b244485c156	1742
unix_guru	0:6b244485c156	1743	13. contact information
unix_guru	0:6b244485c156	1744	-----------------------
unix_guru	0:6b244485c156	1745
unix_guru	0:6b244485c156	1746	Feel free to contact me with suggestions, problems, comments, ... concerning
unix_guru	0:6b244485c156	1747	LodePNG. If you encounter a PNG image that doesn't work properly with this
unix_guru	0:6b244485c156	1748	decoder, feel free to send it and I'll use it to find and fix the problem.
unix_guru	0:6b244485c156	1749
unix_guru	0:6b244485c156	1750	My email address is (puzzle the account and domain together with an @ symbol):
unix_guru	0:6b244485c156	1751	Domain: gmail dot com.
unix_guru	0:6b244485c156	1752	Account: lode dot vandevenne.
unix_guru	0:6b244485c156	1753
unix_guru	0:6b244485c156	1754
unix_guru	0:6b244485c156	1755	Copyright (c) 2005-2016 Lode Vandevenne
unix_guru	0:6b244485c156	1756	*/
unix_guru	0:6b244485c156	1757

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Type:	Library
Created:	23 Feb 2016
Imports:	13
Forks:	0
Commits:	1
Dependents:	0
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Followers:	3

The code in this repository is Apache licensed.

lodePNG.h@0:6b244485c156, 2016-02-23 (annotated)

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