On Fri, Aug 04, 2017 at 10:23:55AM +0200, Marton Balint wrote:
> When the background had an alpha channel, the old code in blend_plane
> calculated premultiplied alpha from the destination plane colors instead of 
> the
> destination alpha.
> Also the calculation of the output alpha should only happen after the color
> planes are already finished.
> Fixes output of:
> ffplay -f lavfi "testsrc2=alpha=32[a];color=black[b];[b][a]overlay[out0]"

if it is easy, please add a fate test when / after you push this


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The misfortune of the wise is better than the prosperity of the fool.
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