| 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 <stdlib.h> | ||
| 23 | |||
| 24 | #include "config.h" | ||
| 25 | #include "libavutil/attributes.h" | ||
| 26 | #include "libavutil/intreadwrite.h" | ||
| 27 | #include "libavutil/macros.h" | ||
| 28 | #include "pngdsp.h" | ||
| 29 | |||
| 30 | #if HAVE_FAST_64BIT | ||
| 31 | #define BITS 64 | ||
| 32 | typedef uint64_t uint_native; | ||
| 33 | #else | ||
| 34 | #define BITS 32 | ||
| 35 | typedef uint32_t uint_native; | ||
| 36 | #endif | ||
| 37 | #define RN AV_JOIN(AV_RN, BITS) | ||
| 38 | #define RNA AV_JOIN(AV_JOIN(AV_RN, BITS), A) | ||
| 39 | #define WN AV_JOIN(AV_WN, BITS) | ||
| 40 | |||
| 41 | // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size | ||
| 42 | #define pb_7f (~(uint_native)0 / 255 * 0x7f) | ||
| 43 | #define pb_80 (~(uint_native)0 / 255 * 0x80) | ||
| 44 | |||
| 45 | 10495 | static void add_bytes_l2_c(uint8_t *dst, const uint8_t *src1, | |
| 46 | const uint8_t *src2, int w) | ||
| 47 | { | ||
| 48 | long i; | ||
| 49 |
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750891 | for (i = 0; i <= w - (int) sizeof(uint_native); i += sizeof(uint_native)) { |
| 50 | 740396 | uint_native a = RNA(src1 + i); | |
| 51 | 740396 | uint_native b = RN (src2 + i); | |
| 52 | 740396 | WN(dst + i, ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80)); | |
| 53 | } | ||
| 54 |
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32287 | for (; i < w; i++) |
| 55 | 21792 | dst[i] = src1[i] + src2[i]; | |
| 56 | 10495 | } | |
| 57 | |||
| 58 | 208269 | void ff_png_add_paeth_prediction(uint8_t *dst, const uint8_t *src, | |
| 59 | const uint8_t *top, int w, int bpp) | ||
| 60 | { | ||
| 61 |
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100143710 | for (int i = 0; i < w; ++i) { |
| 62 | int a, b, c, p, pa, pb, pc; | ||
| 63 | |||
| 64 | 99935441 | a = dst[i - bpp]; | |
| 65 | 99935441 | b = top[i]; | |
| 66 | 99935441 | c = top[i - bpp]; | |
| 67 | |||
| 68 | 99935441 | p = b - c; | |
| 69 | 99935441 | pc = a - c; | |
| 70 | |||
| 71 | 99935441 | pa = abs(p); | |
| 72 | 99935441 | pb = abs(pc); | |
| 73 | 99935441 | pc = abs(p + pc); | |
| 74 | |||
| 75 |
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99935441 | if (pa <= pb && pa <= pc) |
| 76 | 51785013 | p = a; | |
| 77 |
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48150428 | else if (pb <= pc) |
| 78 | 37870495 | p = b; | |
| 79 | else | ||
| 80 | 10279933 | p = c; | |
| 81 | 99935441 | dst[i] = p + src[i]; | |
| 82 | } | ||
| 83 | 208269 | } | |
| 84 | |||
| 85 | 181 | av_cold void ff_pngdsp_init(PNGDSPContext *dsp) | |
| 86 | { | ||
| 87 | 181 | dsp->add_bytes_l2 = add_bytes_l2_c; | |
| 88 | 181 | dsp->add_paeth_prediction = ff_png_add_paeth_prediction; | |
| 89 | |||
| 90 | #if ARCH_AARCH64 | ||
| 91 | ff_pngdsp_init_aarch64(dsp); | ||
| 92 | #elif ARCH_X86 && HAVE_X86ASM | ||
| 93 | 181 | ff_pngdsp_init_x86(dsp); | |
| 94 | #endif | ||
| 95 | 181 | } | |
| 96 |