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Diffstat (limited to 'thirdparty/thorvg/src/loaders/png/tvgLodePng.h')
| -rw-r--r-- | thirdparty/thorvg/src/loaders/png/tvgLodePng.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/thirdparty/thorvg/src/loaders/png/tvgLodePng.h b/thirdparty/thorvg/src/loaders/png/tvgLodePng.h new file mode 100644 index 0000000000..02e1feeec5 --- /dev/null +++ b/thirdparty/thorvg/src/loaders/png/tvgLodePng.h @@ -0,0 +1,174 @@ +/* + * Copyright (c) 2020-2021 Samsung Electronics Co., Ltd. All rights reserved. + + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +/* + LodePNG version 20200306 + + Copyright (c) 2005-2020 Lode Vandevenne + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + + 3. This notice may not be removed or altered from any source + distribution. +*/ + +#ifndef _TVG_LODEPNG_H_ +#define _TVG_LODEPNG_H_ + +#include <stddef.h> + +/*The PNG color types (also used for raw image).*/ +enum LodePNGColorType +{ + LCT_GREY = 0, /*grayscale: 1,2,4,8,16 bit*/ + LCT_RGB = 2, /*RGB: 8,16 bit*/ + LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/ + LCT_GREY_ALPHA = 4, /*grayscale with alpha: 8,16 bit*/ + LCT_RGBA = 6, /*RGB with alpha: 8,16 bit*/ + /*LCT_MAX_OCTET_VALUE lets the compiler allow this enum to represent any invalid + byte value from 0 to 255 that could be present in an invalid PNG file header. Do + not use, compare with or set the name LCT_MAX_OCTET_VALUE, instead either use + the valid color type names above, or numeric values like 1 or 7 when checking for + particular disallowed color type byte values, or cast to integer to print it.*/ + LCT_MAX_OCTET_VALUE = 255 +}; + +/*Settings for zlib decompression*/ +struct LodePNGDecompressSettings +{ + /* Check LodePNGDecoderSettings for more ignorable errors such as ignore_crc */ + unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/ + unsigned ignore_nlen; /*ignore complement of len checksum in uncompressed blocks*/ + + /*use custom zlib decoder instead of built in one (default: null)*/ + unsigned (*custom_zlib)(unsigned char**, size_t*, const unsigned char*, size_t, const LodePNGDecompressSettings*); + /*use custom deflate decoder instead of built in one (default: null) if custom_zlib is not null, custom_inflate is ignored (the zlib format uses deflate)*/ + unsigned (*custom_inflate)(unsigned char**, size_t*, const unsigned char*, size_t, const LodePNGDecompressSettings*); + + const void* custom_context; /*optional custom settings for custom functions*/ +}; + +/* + Color mode of an image. Contains all information required to decode the pixel + bits to RGBA colors. This information is the same as used in the PNG file + format, and is used both for PNG and raw image data in LodePNG. +*/ +struct LodePNGColorMode +{ + /*header (IHDR)*/ + LodePNGColorType colortype; /*color type, see PNG standard or documentation further in this header file*/ + unsigned bitdepth; /*bits per sample, see PNG standard or documentation further in this header file*/ + + /* + palette (PLTE and tRNS) + + Dynamically allocated with the colors of the palette, including alpha. + This field may not be allocated directly, use lodepng_color_mode_init first, + then lodepng_palette_add per color to correctly initialize it (to ensure size + of exactly 1024 bytes). + + The alpha channels must be set as well, set them to 255 for opaque images. + + When decoding, by default you can ignore this palette, since LodePNG already + fills the palette colors in the pixels of the raw RGBA output. + + The palette is only supported for color type 3. + */ + unsigned char* palette; /*palette in RGBARGBA... order. Must be either 0, or when allocated must have 1024 bytes*/ + size_t palettesize; /*palette size in number of colors (amount of used bytes is 4 * palettesize)*/ + + /* + transparent color key (tRNS) + + This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit. + For grayscale PNGs, r, g and b will all 3 be set to the same. + + When decoding, by default you can ignore this information, since LodePNG sets + pixels with this key to transparent already in the raw RGBA output. + + The color key is only supported for color types 0 and 2. + */ + unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/ + unsigned key_r; /*red/grayscale component of color key*/ + unsigned key_g; /*green component of color key*/ + unsigned key_b; /*blue component of color key*/ +}; + +/*Information about the PNG image, except pixels, width and height.*/ +struct LodePNGInfo +{ + /*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/ + unsigned compression_method;/*compression method of the original file. Always 0.*/ + unsigned filter_method; /*filter method of the original file*/ + unsigned interlace_method; /*interlace method of the original file: 0=none, 1=Adam7*/ + LodePNGColorMode color; /*color type and bits, palette and transparency of the PNG file*/ +}; + +/* + Settings for the decoder. This contains settings for the PNG and the Zlib + decoder, but not the Info settings from the Info structs. +*/ +struct LodePNGDecoderSettings +{ + LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/ + + /* Check LodePNGDecompressSettings for more ignorable errors such as ignore_adler32 */ + unsigned ignore_crc; /*ignore CRC checksums*/ + unsigned ignore_critical; /*ignore unknown critical chunks*/ + unsigned ignore_end; /*ignore issues at end of file if possible (missing IEND chunk, too large chunk, ...)*/ + /* TODO: make a system involving warnings with levels and a strict mode instead. Other potentially recoverable + errors: srgb rendering intent value, size of content of ancillary chunks, more than 79 characters for some + strings, placement/combination rules for ancillary chunks, crc of unknown chunks, allowed characters + in string keys, etc... */ + + unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/ +}; + +/*The settings, state and information for extended encoding and decoding.*/ +struct LodePNGState +{ + LodePNGDecoderSettings decoder; /*the decoding settings*/ + LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/ + LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/ + unsigned error; +}; + +void lodepng_state_init(LodePNGState* state); +void lodepng_state_cleanup(LodePNGState* state); +unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, LodePNGState* state, const unsigned char* in, size_t insize); +unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state, const unsigned char* in, size_t insize); + +#endif //_TVG_LODEPNG_H_
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