blob: e967fcf38fb11741c53647387c8f221b38804771
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 NB_PASSES 7 |
46 | |
47 | #define PNGSIG 0x89504e470d0a1a0a |
48 | #define MNGSIG 0x8a4d4e470d0a1a0a |
49 | |
50 | /* Mask to determine which y pixels are valid in a pass */ |
51 | extern const uint8_t ff_png_pass_ymask[NB_PASSES]; |
52 | |
53 | void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size); |
54 | |
55 | void ff_png_zfree(void *opaque, void *ptr); |
56 | |
57 | int ff_png_get_nb_channels(int color_type); |
58 | |
59 | /* compute the row size of an interleaved pass */ |
60 | int ff_png_pass_row_size(int pass, int bits_per_pixel, int width); |
61 | |
62 | void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp); |
63 | |
64 | #endif /* AVCODEC_PNG_H */ |
65 |