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