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1 | /* |
2 | * PNG image format | |
3 | * Copyright (c) 2003 Fabrice Bellard | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #ifndef AVCODEC_PNG_H | |
23 | #define AVCODEC_PNG_H | |
24 | ||
25 | #include <stdint.h> | |
26 | ||
27 | #define PNG_COLOR_MASK_PALETTE 1 | |
28 | #define PNG_COLOR_MASK_COLOR 2 | |
29 | #define PNG_COLOR_MASK_ALPHA 4 | |
30 | ||
31 | #define PNG_COLOR_TYPE_GRAY 0 | |
32 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) | |
33 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) | |
34 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) | |
35 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) | |
36 | ||
37 | #define PNG_FILTER_TYPE_LOCO 64 | |
38 | #define PNG_FILTER_VALUE_NONE 0 | |
39 | #define PNG_FILTER_VALUE_SUB 1 | |
40 | #define PNG_FILTER_VALUE_UP 2 | |
41 | #define PNG_FILTER_VALUE_AVG 3 | |
42 | #define PNG_FILTER_VALUE_PAETH 4 | |
43 | #define PNG_FILTER_VALUE_MIXED 5 | |
44 | ||
45 | #define PNG_IHDR 0x0001 | |
46 | #define PNG_IDAT 0x0002 | |
47 | #define PNG_ALLIMAGE 0x0004 | |
48 | #define PNG_PLTE 0x0008 | |
49 | ||
50 | #define NB_PASSES 7 | |
51 | ||
52 | #define PNGSIG 0x89504e470d0a1a0a | |
53 | #define MNGSIG 0x8a4d4e470d0a1a0a | |
54 | ||
55 | /* Mask to determine which y pixels are valid in a pass */ | |
56 | extern const uint8_t ff_png_pass_ymask[NB_PASSES]; | |
57 | ||
58 | void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size); | |
59 | ||
60 | void ff_png_zfree(void *opaque, void *ptr); | |
61 | ||
62 | int ff_png_get_nb_channels(int color_type); | |
63 | ||
64 | /* compute the row size of an interleaved pass */ | |
65 | int ff_png_pass_row_size(int pass, int bits_per_pixel, int width); | |
66 | ||
67 | void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp); | |
68 | ||
69 | #endif /* AVCODEC_PNG_H */ |