mirror of
https://github.com/libretro/RetroArch
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72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* Copyright (C) 2010-2015 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (rpng.c).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _RPNG_COMMON_H
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#define _RPNG_COMMON_H
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#include <retro_inline.h>
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#include <formats/rpng.h>
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#include <stdint.h>
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#undef GOTO_END_ERROR
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#define GOTO_END_ERROR() do { \
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fprintf(stderr, "[RPNG]: Error in line %d.\n", __LINE__); \
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ret = false; \
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goto end; \
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} while(0)
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
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#endif
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static const uint8_t png_magic[8] = {
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0x89, 'P', 'N', 'G', 0x0d, 0x0a, 0x1a, 0x0a,
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};
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struct png_ihdr
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{
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uint32_t width;
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uint32_t height;
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uint8_t depth;
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uint8_t color_type;
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uint8_t compression;
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uint8_t filter;
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uint8_t interlace;
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};
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/* Paeth prediction filter. */
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static INLINE int paeth(int a, int b, int c)
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{
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int p = a + b - c;
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int pa = abs(p - a);
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int pb = abs(p - b);
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int pc = abs(p - c);
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if (pa <= pb && pa <= pc)
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return a;
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else if (pb <= pc)
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return b;
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return c;
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}
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#endif
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