[FFmpeg-devel] [PATCH 2/4] swscale/rgb2rgb: improve chroma conversion in ff_rgb24toyv12_c

[Ramiro Polla]

On Wed, Aug 28, 2024 at 10:43 PM Ramiro Polla <ramiro.polla at gmail.com> wrote:
>
> The current code subsamples by dropping 3/4 pixels to calculate the
> chroma components. This commit calculates the average of 4 rgb pixels
> before calculating the chroma components, putting it in line with the
> mmxext implementation.
> ---
>  libswscale/rgb2rgb_template.c | 88 ++++++++++++++++-------------------
>  1 file changed, 41 insertions(+), 47 deletions(-)

New patch attached removes another occurrence of the comment about
chrominance data only being taken from every second line.
It also flips the patch order so this is the first one in the patchset
(and therefore checkasm doesn't fail on x86).

I'll push the patchset in a couple of days if there are no more comments.
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