FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pngdsp.c
Date: 2024-04-19 17:50:32
Exec Total Coverage
Lines: 13 13 100.0%
Functions: 2 2 100.0%
Branches: 4 4 100.0%

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 "libavutil/intreadwrite.h"
25 #include "libavutil/macros.h"
26 #include "png.h"
27 #include "pngdsp.h"
28
29 #if HAVE_FAST_64BIT
30 #define BITS 64
31 typedef uint64_t uint_native;
32 #else
33 #define BITS 32
34 typedef uint32_t uint_native;
35 #endif
36 #define RN AV_JOIN(AV_RN, BITS)
37 #define RNA AV_JOIN(AV_JOIN(AV_RN, BITS), A)
38 #define WN AV_JOIN(AV_WN, BITS)
39
40 // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
41 #define pb_7f (~(uint_native)0 / 255 * 0x7f)
42 #define pb_80 (~(uint_native)0 / 255 * 0x80)
43
44 10486 static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
45 {
46 long i;
47
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748578 for (i = 0; i <= w - (int) sizeof(uint_native); i += sizeof(uint_native)) {
48 738092 uint_native a = RNA(src1 + i);
49 738092 uint_native b = RN (src2 + i);
50 738092 WN(dst + i, ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80));
51 }
52
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32248 for (; i < w; i++)
53 21762 dst[i] = src1[i] + src2[i];
54 10486 }
55
56 159 av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
57 {
58 159 dsp->add_bytes_l2 = add_bytes_l2_c;
59 159 dsp->add_paeth_prediction = ff_add_png_paeth_prediction;
60
61 #if ARCH_X86
62 159 ff_pngdsp_init_x86(dsp);
63 #endif
64 159 }
65