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