On Wed, Jul 13, 2022 at 11:38 AM Marco Vianini <
marco_vianini-at-yahoo...@ffmpeg.org> wrote:
> You can get a very big improvement of performances in the special (but
> very likely) case of: "(dst_linesize == bytewidth && src_linesize ==
> bytewidth)"
>
> In this case in fact We can "Coalesce rows", that is using ONLY ONE
> MEMCPY, instead of a smaller memcpy for every row (that is looping for
> height times).
>
> Code:"static void image_copy_plane(uint8_t *dst, ptrdiff_t
> dst_linesize, const uint8_t *src, ptrdiff_t
> src_linesize, ptrdiff_t bytewidth, int
> height){ if (!dst || !src) return;
> av_assert0(abs(src_linesize) >= bytewidth); av_assert0(abs(dst_linesize)
> >= bytewidth); // MY PATCH START // Coalesce rows. if (dst_linesize
> == bytewidth && src_linesize == bytewidth) { bytewidth *= height;
> height = 1; src_linesize = dst_linesize = 0; }// MY PATCH STOP
> for (;height > 0; height--) { memcpy(dst, src, bytewidth);
> dst += dst_linesize; src += src_linesize; }}"
> What do You think about?Thank You
>
Show the benchmark numbers.
> Marco Vianini
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