/* * 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 extern const uint8_t ff_pngsig[8]; extern const uint8_t ff_mngsig[8]; /* 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 */