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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * PNG image format |
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| 3 | * Copyright (c) 2003 Fabrice Bellard |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #ifndef AVCODEC_PNG_H |
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| 23 | #define AVCODEC_PNG_H |
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| 24 | |||
| 25 | #include |
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| 26 | |||
| 27 | #define PNG_COLOR_MASK_PALETTE 1 |
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| 28 | #define PNG_COLOR_MASK_COLOR 2 |
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| 29 | #define PNG_COLOR_MASK_ALPHA 4 |
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| 30 | |||
| 31 | #define PNG_COLOR_TYPE_GRAY 0 |
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| 32 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
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| 33 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
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| 34 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
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| 35 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
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| 36 | |||
| 37 | #define PNG_FILTER_TYPE_LOCO 64 |
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| 38 | #define PNG_FILTER_VALUE_NONE 0 |
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| 39 | #define PNG_FILTER_VALUE_SUB 1 |
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| 40 | #define PNG_FILTER_VALUE_UP 2 |
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| 41 | #define PNG_FILTER_VALUE_AVG 3 |
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| 42 | #define PNG_FILTER_VALUE_PAETH 4 |
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| 43 | #define PNG_FILTER_VALUE_MIXED 5 |
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| 44 | |||
| 45 | #define PNG_IHDR 0x0001 |
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| 46 | #define PNG_IDAT 0x0002 |
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| 47 | #define PNG_ALLIMAGE 0x0004 |
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| 48 | #define PNG_PLTE 0x0008 |
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| 49 | |||
| 50 | #define NB_PASSES 7 |
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| 51 | |||
| 52 | #define PNGSIG 0x89504e470d0a1a0a |
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| 53 | #define MNGSIG 0x8a4d4e470d0a1a0a |
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| 54 | |||
| 55 | /* Mask to determine which y pixels are valid in a pass */ |
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| 56 | extern const uint8_t ff_png_pass_ymask[NB_PASSES]; |
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| 57 | |||
| 58 | void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size); |
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| 59 | |||
| 60 | void ff_png_zfree(void *opaque, void *ptr); |
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| 61 | |||
| 62 | int ff_png_get_nb_channels(int color_type); |
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| 63 | |||
| 64 | /* compute the row size of an interleaved pass */ |
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| 65 | int ff_png_pass_row_size(int pass, int bits_per_pixel, int width); |
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| 66 | |||
| 67 | void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp); |
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| 68 | |||
| 69 | #endif /* AVCODEC_PNG_H */ |