[FFmpeg-devel] [PATCH 1/3] avcodec/screenpresso: Optimize sum_delta_flipped()
Paul B Mahol
onemda at gmail.com
Thu Jan 30 10:22:53 EET 2020
lgtm
On 1/29/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> 553 -> 332 sec
>
> Testcase:
> 20280/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SCREENPRESSO_fuzzer-6238663432470528
>
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
> libavcodec/screenpresso.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/screenpresso.c b/libavcodec/screenpresso.c
> index 5fac100897..d73c24df83 100644
> --- a/libavcodec/screenpresso.c
> +++ b/libavcodec/screenpresso.c
> @@ -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;
> }
> }
> --
> 2.17.1
>
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