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/* Copyright (C) 2010-2015 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (rpng.c).
* ---------------------------------------------------------------------------------------
*
* 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.
*/
#ifndef _RPNG_COMMON_H
#define _RPNG_COMMON_H
#include <retro_inline.h>
#include <formats/rpng.h>
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#include <stdint.h>
#undef GOTO_END_ERROR
#define GOTO_END_ERROR() do { \
fprintf(stderr, "[RPNG]: Error in line %d.\n", __LINE__); \
ret = false; \
goto end; \
} while(0)
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#endif
static const uint8_t png_magic[8] = {
0x89, 'P', 'N', 'G', 0x0d, 0x0a, 0x1a, 0x0a,
};
enum png_chunk_type
{
PNG_CHUNK_NOOP = 0,
PNG_CHUNK_ERROR,
PNG_CHUNK_IHDR,
PNG_CHUNK_IDAT,
PNG_CHUNK_PLTE,
PNG_CHUNK_IEND
};
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enum png_line_filter
{
PNG_FILTER_NONE = 0,
PNG_FILTER_SUB,
PNG_FILTER_UP,
PNG_FILTER_AVERAGE,
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PNG_FILTER_PAETH
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};
enum png_ihdr_color_type
{
PNG_IHDR_COLOR_GRAY = 0,
PNG_IHDR_COLOR_RGB = 2,
PNG_IHDR_COLOR_PLT = 3,
PNG_IHDR_COLOR_GRAY_ALPHA = 4,
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PNG_IHDR_COLOR_RGBA = 6
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};
struct adam7_pass
{
unsigned x;
unsigned y;
unsigned stride_x;
unsigned stride_y;
};
/* Paeth prediction filter. */
static INLINE int paeth(int a, int b, int c)
{
int p = a + b - c;
int pa = abs(p - a);
int pb = abs(p - b);
int pc = abs(p - c);
if (pa <= pb && pa <= pc)
return a;
else if (pb <= pc)
return b;
return c;
}
static INLINE uint32_t dword_be(const uint8_t *buf)
{
return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | (buf[3] << 0);
}
#endif