GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pngdsp.c Lines: 13 13 100.0 %
Date: 2019-11-18 18:00:01 Branches: 4 4 100.0 %

Line Branch Exec Source
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/*
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 * PNG image format
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 * Copyright (c) 2008 Loren Merrit <lorenm@u.washington.edu>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#include "png.h"
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#include "pngdsp.h"
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// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
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#define pb_7f (~0UL / 255 * 0x7f)
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#define pb_80 (~0UL / 255 * 0x80)
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static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
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{
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    long i;
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    for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
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        long a = *(long *)(src1 + i);
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        long b = *(long *)(src2 + i);
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        *(long *)(dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
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    }
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    for (; i < w; i++)
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        dst[i] = src1[i] + src2[i];
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}
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av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
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{
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    dsp->add_bytes_l2         = add_bytes_l2_c;
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    dsp->add_paeth_prediction = ff_add_png_paeth_prediction;
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    if (ARCH_X86)
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        ff_pngdsp_init_x86(dsp);
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}