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1 | /* | ||
2 | * PNG image format | ||
3 | * Copyright (c) 2008 Loren Merrit <lorenm@u.washington.edu> | ||
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 | #include "config.h" | ||
23 | #include "libavutil/attributes.h" | ||
24 | #include "png.h" | ||
25 | #include "pngdsp.h" | ||
26 | |||
27 | // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size | ||
28 | #define pb_7f (~0UL / 255 * 0x7f) | ||
29 | #define pb_80 (~0UL / 255 * 0x80) | ||
30 | |||
31 | 10460 | static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w) | |
32 | { | ||
33 | long i; | ||
34 |
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746602 | for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) { |
35 | 736142 | long a = *(long *)(src1 + i); | |
36 | 736142 | long b = *(long *)(src2 + i); | |
37 | 736142 | *(long *)(dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80); | |
38 | } | ||
39 |
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32222 | for (; i < w; i++) |
40 | 21762 | dst[i] = src1[i] + src2[i]; | |
41 | 10460 | } | |
42 | |||
43 | 158 | av_cold void ff_pngdsp_init(PNGDSPContext *dsp) | |
44 | { | ||
45 | 158 | dsp->add_bytes_l2 = add_bytes_l2_c; | |
46 | 158 | dsp->add_paeth_prediction = ff_add_png_paeth_prediction; | |
47 | |||
48 | #if ARCH_X86 | ||
49 | 158 | ff_pngdsp_init_x86(dsp); | |
50 | #endif | ||
51 | 158 | } | |
52 |