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
Marco Vianini
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