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73 lines
1.5 KiB
73 lines
1.5 KiB
/* |
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img_png.h - png format reference |
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Copyright (C) 2019 Andrey Akhmichin |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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*/ |
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#ifndef IMG_PNG_H |
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#define IMG_PNG_H |
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/* |
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======================================================================== |
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.PNG image format (Portable Network Graphics) |
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======================================================================== |
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*/ |
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enum |
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{ |
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PNG_CT_GREY, |
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PNG_CT_PALLETE = BIT(0), |
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PNG_CT_RGB = BIT(1), |
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PNG_CT_ALPHA = BIT(2), |
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PNG_CT_RGBA = (PNG_CT_RGB|PNG_CT_ALPHA) |
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} png_colortype; |
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enum |
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{ |
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PNG_F_NONE, |
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PNG_F_SUB, |
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PNG_F_UP, |
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PNG_F_AVERAGE, |
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PNG_F_PAETH |
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} png_filter; |
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#pragma pack( push, 1 ) |
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typedef struct png_ihdr_s |
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{ |
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uint width; |
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uint height; |
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byte bitdepth; |
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byte colortype; |
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byte compression; |
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byte filter; |
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byte interlace; |
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} png_ihdr_t; |
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typedef struct png_s |
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{ |
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byte sign[8]; |
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uint ihdr_len; |
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byte ihdr_sign[4]; |
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png_ihdr_t ihdr_chunk; |
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uint ihdr_crc32; |
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} png_t; |
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#pragma pack( pop ) |
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typedef struct png_footer_s |
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{ |
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uint idat_crc32; |
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uint iend_len; |
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byte iend_sign[4]; |
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uint iend_crc32; |
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} png_footer_t; |
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#endif // IMG_PNG_H |
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