mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
a09ae4ef65
Reviewed-by: Michael Niedermayer <michaelni@gmx.at> Signed-off-by: Paul B Mahol <onemda@gmail.com>
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
|
|
* PNG image format
|
|
* Copyright (c) 2003 Fabrice Bellard
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_PNG_H
|
|
#define AVCODEC_PNG_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#define PNG_COLOR_MASK_PALETTE 1
|
|
#define PNG_COLOR_MASK_COLOR 2
|
|
#define PNG_COLOR_MASK_ALPHA 4
|
|
|
|
#define PNG_COLOR_TYPE_GRAY 0
|
|
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
|
|
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
|
|
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
|
|
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
|
|
|
|
#define PNG_FILTER_TYPE_LOCO 64
|
|
#define PNG_FILTER_VALUE_NONE 0
|
|
#define PNG_FILTER_VALUE_SUB 1
|
|
#define PNG_FILTER_VALUE_UP 2
|
|
#define PNG_FILTER_VALUE_AVG 3
|
|
#define PNG_FILTER_VALUE_PAETH 4
|
|
#define PNG_FILTER_VALUE_MIXED 5
|
|
|
|
#define PNG_IHDR 0x0001
|
|
#define PNG_IDAT 0x0002
|
|
#define PNG_ALLIMAGE 0x0004
|
|
#define PNG_PLTE 0x0008
|
|
|
|
#define NB_PASSES 7
|
|
|
|
#define PNGSIG 0x89504e470d0a1a0a
|
|
#define MNGSIG 0x8a4d4e470d0a1a0a
|
|
|
|
/* Mask to determine which y pixels are valid in a pass */
|
|
extern const uint8_t ff_png_pass_ymask[NB_PASSES];
|
|
|
|
void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size);
|
|
|
|
void ff_png_zfree(void *opaque, void *ptr);
|
|
|
|
int ff_png_get_nb_channels(int color_type);
|
|
|
|
/* compute the row size of an interleaved pass */
|
|
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width);
|
|
|
|
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
|
|
|
|
#endif /* AVCODEC_PNG_H */
|