[LodePNG] Update lodepng to version 20150418.
This commit is contained in:
Bernard Xiong
parent
c6d4407c57
commit
3f6c511a13
File diff suppressed because it is too large
Load Diff
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@ -1,7 +1,7 @@
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/*
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LodePNG version 20131222
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LodePNG version 20150418
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Copyright (c) 2005-2013 Lode Vandevenne
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Copyright (c) 2005-2015 Lode Vandevenne
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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@ -36,6 +36,8 @@ freely, subject to the following restrictions:
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#include <string>
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#endif /*__cplusplus*/
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extern const char* LODEPNG_VERSION_STRING;
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/*
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The following #defines are used to create code sections. They can be disabled
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to disable code sections, which can give faster compile time and smaller binary.
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@ -198,7 +200,8 @@ unsigned lodepng_encode24_file(const char* filename,
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namespace lodepng
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{
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#ifdef LODEPNG_COMPILE_DECODER
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/*Same as lodepng_decode_memory, but decodes to an std::vector.*/
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/*Same as lodepng_decode_memory, but decodes to an std::vector. The colortype
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is the format to output the pixels to. Default is RGBA 8-bit per channel.*/
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unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
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const unsigned char* in, size_t insize,
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LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
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@ -213,11 +216,12 @@ Same as the other decode functions, but instead takes a filename as input.
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unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
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const std::string& filename,
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LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
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#endif //LODEPNG_COMPILE_DISK
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#endif //LODEPNG_COMPILE_DECODER
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#endif /* LODEPNG_COMPILE_DISK */
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#endif /* LODEPNG_COMPILE_DECODER */
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#ifdef LODEPNG_COMPILE_ENCODER
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/*Same as lodepng_encode_memory, but encodes to an std::vector.*/
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/*Same as lodepng_encode_memory, but encodes to an std::vector. colortype
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is that of the raw input data. The output PNG color type will be auto chosen.*/
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unsigned encode(std::vector<unsigned char>& out,
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const unsigned char* in, unsigned w, unsigned h,
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LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
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@ -236,9 +240,9 @@ unsigned encode(const std::string& filename,
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unsigned encode(const std::string& filename,
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const std::vector<unsigned char>& in, unsigned w, unsigned h,
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LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
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#endif //LODEPNG_COMPILE_DISK
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#endif //LODEPNG_COMPILE_ENCODER
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} //namespace lodepng
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#endif /* LODEPNG_COMPILE_DISK */
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#endif /* LODEPNG_COMPILE_ENCODER */
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} /* namespace lodepng */
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#endif /*LODEPNG_COMPILE_CPP*/
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#endif /*LODEPNG_COMPILE_PNG*/
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@ -283,7 +287,7 @@ struct LodePNGCompressSettings /*deflate = compress*/
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/*LZ77 related settings*/
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unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/
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unsigned use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/
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unsigned windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Typical value: 2048.*/
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unsigned windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Default value: 2048.*/
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unsigned minmatch; /*mininum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0*/
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unsigned nicematch; /*stop searching if >= this length found. Set to 258 for best compression. Default: 128*/
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unsigned lazymatching; /*use lazy matching: better compression but a bit slower. Default: true*/
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@ -499,13 +503,14 @@ LodePNGColorMode structs to describe the input and output color type.
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See the reference manual at the end of this header file to see which color conversions are supported.
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return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported)
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The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel
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of the output color type (lodepng_get_bpp)
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The fix_png value works as described in struct LodePNGDecoderSettings.
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Note: for 16-bit per channel colors, uses big endian format like PNG does.
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of the output color type (lodepng_get_bpp).
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For < 8 bpp images, there should not be padding bits at the end of scanlines.
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For 16-bit per channel colors, uses big endian format like PNG does.
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Return value is LodePNG error code
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*/
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unsigned lodepng_convert(unsigned char* out, const unsigned char* in,
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LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in,
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unsigned w, unsigned h, unsigned fix_png);
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unsigned w, unsigned h);
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#ifdef LODEPNG_COMPILE_DECODER
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/*
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@ -517,16 +522,7 @@ typedef struct LodePNGDecoderSettings
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LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/
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unsigned ignore_crc; /*ignore CRC checksums*/
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/*
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The fix_png setting, if 1, makes the decoder tolerant towards some PNG images
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that do not correctly follow the PNG specification. This only supports errors
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that are fixable, were found in images that are actually used on the web, and
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are silently tolerated by other decoders as well. Currently only one such fix
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is implemented: if a palette index is out of bounds given the palette size,
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interpret it as opaque black.
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By default this value is 0, which makes it stop with an error on such images.
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*/
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unsigned fix_png;
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unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/
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#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
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@ -559,46 +555,39 @@ typedef enum LodePNGFilterStrategy
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LFS_PREDEFINED
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} LodePNGFilterStrategy;
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/*automatically use color type with less bits per pixel if losslessly possible. Default: LAC_AUTO*/
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typedef enum LodePNGAutoConvert
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/*Gives characteristics about the colors of the image, which helps decide which color model to use for encoding.
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Used internally by default if "auto_convert" is enabled. Public because it's useful for custom algorithms.*/
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typedef struct LodePNGColorProfile
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{
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LAC_NO, /*use color type user requested*/
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LAC_ALPHA, /*use color type user requested, but if only opaque pixels and RGBA or grey+alpha, use RGB or grey*/
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LAC_AUTO, /*use PNG color type that can losslessly represent the uncompressed image the smallest possible*/
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/*
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like AUTO, but do not choose 1, 2 or 4 bit per pixel types.
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sometimes a PNG image compresses worse if less than 8 bits per pixels.
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*/
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LAC_AUTO_NO_NIBBLES,
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/*
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like AUTO, but never choose palette color type. For small images, encoding
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the palette may take more bytes than what is gained. Note that AUTO also
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already prevents encoding the palette for extremely small images, but that may
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not be sufficient because due to the compression it cannot predict when to
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switch.
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*/
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LAC_AUTO_NO_PALETTE,
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LAC_AUTO_NO_NIBBLES_NO_PALETTE
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} LodePNGAutoConvert;
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unsigned colored; /*not greyscale*/
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unsigned key; /*if true, image is not opaque. Only if true and alpha is false, color key is possible.*/
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unsigned short key_r; /*these values are always in 16-bit bitdepth in the profile*/
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unsigned short key_g;
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unsigned short key_b;
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unsigned alpha; /*alpha channel or alpha palette required*/
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unsigned numcolors; /*amount of colors, up to 257. Not valid if bits == 16.*/
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unsigned char palette[1024]; /*Remembers up to the first 256 RGBA colors, in no particular order*/
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unsigned bits; /*bits per channel (not for palette). 1,2 or 4 for greyscale only. 16 if 16-bit per channel required.*/
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} LodePNGColorProfile;
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void lodepng_color_profile_init(LodePNGColorProfile* profile);
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/*
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Automatically chooses color type that gives smallest amount of bits in the
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output image, e.g. grey if there are only greyscale pixels, palette if there
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are less than 256 colors, ...
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The auto_convert parameter allows limiting it to not use palette, ...
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*/
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/*Get a LodePNGColorProfile of the image.*/
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unsigned lodepng_get_color_profile(LodePNGColorProfile* profile,
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const unsigned char* image, unsigned w, unsigned h,
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const LodePNGColorMode* mode_in);
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/*The function LodePNG uses internally to decide the PNG color with auto_convert.
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Chooses an optimal color model, e.g. grey if only grey pixels, palette if < 256 colors, ...*/
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unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out,
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const unsigned char* image, unsigned w, unsigned h,
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const LodePNGColorMode* mode_in,
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LodePNGAutoConvert auto_convert);
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const LodePNGColorMode* mode_in);
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/*Settings for the encoder.*/
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typedef struct LodePNGEncoderSettings
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{
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LodePNGCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/
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LodePNGAutoConvert auto_convert; /*how to automatically choose output PNG color type, if at all*/
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unsigned auto_convert; /*automatically choose output PNG color type. Default: true*/
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/*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than
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8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to
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@ -643,7 +632,7 @@ typedef struct LodePNGState
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LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/
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unsigned error;
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#ifdef LODEPNG_COMPILE_CPP
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//For the lodepng::State subclass.
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/* For the lodepng::State subclass. */
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virtual ~LodePNGState(){}
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#endif
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} LodePNGState;
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@ -693,7 +682,11 @@ Third byte: must be uppercase
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Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy
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*/
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/*get the length of the data of the chunk. Total chunk length has 12 bytes more.*/
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/*
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Gets the length of the data of the chunk. Total chunk length has 12 bytes more.
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There must be at least 4 bytes to read from. If the result value is too large,
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it may be corrupt data.
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*/
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unsigned lodepng_chunk_length(const unsigned char* chunk);
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/*puts the 4-byte type in null terminated string*/
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@ -821,7 +814,7 @@ unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const
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#endif /*LODEPNG_COMPILE_DISK*/
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#ifdef LODEPNG_COMPILE_CPP
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//The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers.
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/* The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers. */
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namespace lodepng
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{
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#ifdef LODEPNG_COMPILE_PNG
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@ -835,7 +828,7 @@ class State : public LodePNGState
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};
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#ifdef LODEPNG_COMPILE_DECODER
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//Same as other lodepng::decode, but using a State for more settings and information.
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/* Same as other lodepng::decode, but using a State for more settings and information. */
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unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
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State& state,
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const unsigned char* in, size_t insize);
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@ -845,7 +838,7 @@ unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
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#endif /*LODEPNG_COMPILE_DECODER*/
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#ifdef LODEPNG_COMPILE_ENCODER
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//Same as other lodepng::encode, but using a State for more settings and information.
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/* Same as other lodepng::encode, but using a State for more settings and information. */
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unsigned encode(std::vector<unsigned char>& out,
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const unsigned char* in, unsigned w, unsigned h,
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State& state);
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@ -866,31 +859,31 @@ Save the binary data in an std::vector to a file on disk. The file is overwritte
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without warning.
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*/
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void save_file(const std::vector<unsigned char>& buffer, const std::string& filename);
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#endif //LODEPNG_COMPILE_DISK
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#endif //LODEPNG_COMPILE_PNG
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#endif /* LODEPNG_COMPILE_DISK */
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#endif /* LODEPNG_COMPILE_PNG */
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#ifdef LODEPNG_COMPILE_ZLIB
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#ifdef LODEPNG_COMPILE_DECODER
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//Zlib-decompress an unsigned char buffer
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/* Zlib-decompress an unsigned char buffer */
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unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
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const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
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//Zlib-decompress an std::vector
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/* Zlib-decompress an std::vector */
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unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
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const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
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#endif //LODEPNG_COMPILE_DECODER
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#endif /* LODEPNG_COMPILE_DECODER */
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#ifdef LODEPNG_COMPILE_ENCODER
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//Zlib-compress an unsigned char buffer
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/* Zlib-compress an unsigned char buffer */
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unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
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const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
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//Zlib-compress an std::vector
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/* Zlib-compress an std::vector */
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unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
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const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
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#endif //LODEPNG_COMPILE_ENCODER
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#endif //LODEPNG_COMPILE_ZLIB
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} //namespace lodepng
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#endif /* LODEPNG_COMPILE_ENCODER */
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#endif /* LODEPNG_COMPILE_ZLIB */
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} /* namespace lodepng */
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#endif /*LODEPNG_COMPILE_CPP*/
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/*
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@ -904,8 +897,8 @@ TODO:
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[X] let the "isFullyOpaque" function check color keys and transparent palettes too
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[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl"
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[ ] don't stop decoding on errors like 69, 57, 58 (make warnings)
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[ ] make option to choose if the raw image with non multiple of 8 bits per scanline should have padding bits or not
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[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes
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[ ] allow user to provide custom color conversion functions, e.g. for premultiplied alpha, padding bits or not, ...
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*/
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#endif /*LODEPNG_H inclusion guard*/
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@ -1243,20 +1236,22 @@ behaviour.
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If, when decoding, you want the raw image to be something else than the default,
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you need to set the color type and bit depth you want in the LodePNGColorMode,
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or the parameters of the simple function of LodePNG you're using.
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or the parameters colortype and bitdepth of the simple decoding function.
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If, when encoding, you use another color type than the default in the input
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If, when encoding, you use another color type than the default in the raw input
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image, you need to specify its color type and bit depth in the LodePNGColorMode
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of the raw image, or use the parameters of the simplefunction of LodePNG you're
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using.
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of the raw image, or use the parameters colortype and bitdepth of the simple
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encoding function.
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If, when encoding, you don't want LodePNG to choose the output PNG color type
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but control it yourself, you need to set auto_convert in the encoder settings
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to LAC_NONE, and specify the color type you want in the LodePNGInfo of the
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encoder.
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to false, and specify the color type you want in the LodePNGInfo of the
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encoder (including palette: it can generate a palette if auto_convert is true,
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otherwise not).
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If you do any of the above, LodePNG may need to do a color conversion, which
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follows the rules below, and may sometimes not be allowed.
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If the input and output color type differ (whether user chosen or auto chosen),
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LodePNG will do a color conversion, which follows the rules below, and may
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sometimes result in an error.
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To avoid some confusion:
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-the decoder converts from PNG to raw image
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@ -1278,7 +1273,7 @@ To avoid some confusion:
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Non supported color conversions:
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-color to greyscale: no error is thrown, but the result will look ugly because
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only the red channel is taken
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-anything, to palette when that palette does not have that color in it: in this
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-anything to palette when that palette does not have that color in it: in this
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case an error is thrown
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Supported color conversions:
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@ -1288,10 +1283,10 @@ Supported color conversions:
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-removing alpha channel
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-higher to smaller bitdepth, and vice versa
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If you want no color conversion to be done:
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If you want no color conversion to be done (e.g. for speed or control):
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-In the encoder, you can make it save a PNG with any color type by giving the
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raw color mode and LodePNGInfo the same color mode, and setting auto_convert to
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LAC_NO.
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false.
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-In the decoder, you can make it store the pixel data in the same color type
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as the PNG has, by setting the color_convert setting to false. Settings in
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info_raw are then ignored.
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@ -1458,6 +1453,8 @@ LodePNG. For the C++ version, only the standard C++ library is needed on top.
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Add the files lodepng.c(pp) and lodepng.h to your project, include
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lodepng.h where needed, and your program can read/write PNG files.
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It is compatible with C90 and up, and C++03 and up.
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If performance is important, use optimization when compiling! For both the
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encoder and decoder, this makes a large difference.
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@ -1473,49 +1470,40 @@ LodePNG is developed in gcc so this compiler is natively supported. It gives no
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warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++
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version 4.7.1 on Linux, 32-bit and 64-bit.
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*) Clang
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Fully supported and warning-free.
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*) Mingw
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The Mingw compiler (a port of gcc) for Windows is fully supported by LodePNG.
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The Mingw compiler (a port of gcc for Windows) should be fully supported by
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LodePNG.
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*) Visual Studio 2005 and up, Visual C++ Express Edition 2005 and up
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*) Visual Studio and Visual C++ Express Edition
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Visual Studio may give warnings about 'fopen' being deprecated. A multiplatform library
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can't support the proposed Visual Studio alternative however, so LodePNG keeps using
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fopen. If you don't want to see the deprecated warnings, put this on top of lodepng.h
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before the inclusions:
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#define _CRT_SECURE_NO_DEPRECATE
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Other than the above warnings, LodePNG should be warning-free with warning
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level 3 (W3). Warning level 4 (W4) will give warnings about integer conversions.
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I'm not planning to resolve these warnings. To get rid of them, let Visual
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Studio use warning level W3 for lodepng.cpp only: right click lodepng.cpp,
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Properties, C/C++, General, Warning Level: Level 3 (/W3).
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LodePNG should be warning-free with warning level W4. Two warnings were disabled
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with pragmas though: warning 4244 about implicit conversions, and warning 4996
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where it wants to use a non-standard function fopen_s instead of the standard C
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fopen.
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Visual Studio may want "stdafx.h" files to be included in each source file and
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give an error "unexpected end of file while looking for precompiled header".
|
||||
That is not standard C++ and will not be added to the stock LodePNG. You can
|
||||
This is not standard C++ and will not be added to the stock LodePNG. You can
|
||||
disable it for lodepng.cpp only by right clicking it, Properties, C/C++,
|
||||
Precompiled Headers, and set it to Not Using Precompiled Headers there.
|
||||
|
||||
*) Visual Studio 6.0
|
||||
|
||||
LodePNG support for Visual Studio 6.0 is not guaranteed because VS6 doesn't
|
||||
follow the C++ standard correctly.
|
||||
|
||||
*) Comeau C/C++
|
||||
|
||||
Vesion 20070107 compiles without problems on the Comeau C/C++ Online Test Drive
|
||||
at http://www.comeaucomputing.com/tryitout in both C90 and C++ mode.
|
||||
NOTE: Modern versions of VS should be fully supported, but old versions, e.g.
|
||||
VS6, are not guaranteed to work.
|
||||
|
||||
*) Compilers on Macintosh
|
||||
|
||||
LodePNG has been reported to work both with the gcc and LLVM for Macintosh, both
|
||||
for C and C++.
|
||||
LodePNG has been reported to work both with gcc and LLVM for Macintosh, both for
|
||||
C and C++.
|
||||
|
||||
*) Other Compilers
|
||||
|
||||
If you encounter problems on other compilers, feel free to let me know and I may
|
||||
try to fix it if the compiler is modern standards complient.
|
||||
If you encounter problems on any compilers, feel free to let me know and I may
|
||||
try to fix it if the compiler is modern and standards complient.
|
||||
|
||||
|
||||
10. examples
|
||||
|
|
@ -1577,6 +1565,11 @@ yyyymmdd.
|
|||
Some changes aren't backwards compatible. Those are indicated with a (!)
|
||||
symbol.
|
||||
|
||||
*) 18 apr 2015: Boundary PM instead of just package-merge for faster encoding.
|
||||
*) 23 aug 2014: Reduced needless memory usage of decoder.
|
||||
*) 28 jun 2014: Removed fix_png setting, always support palette OOB for
|
||||
simplicity. Made ColorProfile public.
|
||||
*) 09 jun 2014: Faster encoder by fixing hash bug and more zeros optimization.
|
||||
*) 22 dec 2013: Power of two windowsize required for optimization.
|
||||
*) 15 apr 2013: Fixed bug with LAC_ALPHA and color key.
|
||||
*) 25 mar 2013: Added an optional feature to ignore some PNG errors (fix_png).
|
||||
|
|
@ -1715,5 +1708,5 @@ Domain: gmail dot com.
|
|||
Account: lode dot vandevenne.
|
||||
|
||||
|
||||
Copyright (c) 2005-2013 Lode Vandevenne
|
||||
Copyright (c) 2005-2015 Lode Vandevenne
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue