| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | 10486 | 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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748578 | for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) { |
| 35 | 738092 | long a = *(long *)(src1 + i); | |
| 36 | 738092 | long b = *(long *)(src2 + i); | |
| 37 | 738092 | *(long *)(dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80); | |
| 38 | } | ||
| 39 |
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32248 | for (; i < w; i++) |
| 40 | 21762 | dst[i] = src1[i] + src2[i]; | |
| 41 | 10486 | } | |
| 42 | |||
| 43 | 159 | av_cold void ff_pngdsp_init(PNGDSPContext *dsp) | |
| 44 | { | ||
| 45 | 159 | dsp->add_bytes_l2 = add_bytes_l2_c; | |
| 46 | 159 | dsp->add_paeth_prediction = ff_add_png_paeth_prediction; | |
| 47 | |||
| 48 | #if ARCH_X86 | ||
| 49 | 159 | ff_pngdsp_init_x86(dsp); | |
| 50 | #endif | ||
| 51 | 159 | } | |
| 52 |