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avcodec/screenpresso: Optimize sum_delta_flipped() 

553 -> 332 sec

Testcase: 20280/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SCREENPRESSO_fuzzer-6238663432470528

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-01-29 19:20:29 +01:00
parent 6e8e8431e1
commit 20916f9bc4
1 changed files with 2 additions and 1 deletions
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3
libavcodec/screenpresso.c
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@ -94,8 +94,9 @@ static void sum_delta_flipped(uint8_t *dst, int dst_linesize,
{
int i;
for (; height > 0; height--) {
const uint8_t *src1 = &src[(height - 1) * src_linesize];
for (i = 0; i < bytewidth; i++)
dst[i] += src[(height - 1) * src_linesize + i];
dst[i] += src1[i];
dst += dst_linesize;
}
}