On Wed, 29 Sep 2021 09:54:14 +0000 Simon Ser <contact@xxxxxxxxxxx> wrote: > When a plane is missing the "alpha blend mode" property, KMS drivers > will use the pre-multiplied mode. > > Signed-off-by: Simon Ser <contact@xxxxxxxxxxx> > Cc: Daniel Vetter <daniel@xxxxxxxx> > Cc: Pekka Paalanen <ppaalanen@xxxxxxxxx> > --- > drivers/gpu/drm/drm_blend.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c > index ec37cbfabb50..eebb32ba84d7 100644 > --- a/drivers/gpu/drm/drm_blend.c > +++ b/drivers/gpu/drm/drm_blend.c > @@ -185,6 +185,9 @@ > * plane does not expose the "alpha" property, then this is > * assumed to be 1.0 > * > + * When a plane is missing this property, the plane uses the > + * "Pre-multiplied" equation. > + * > * Note that all the property extensions described here apply either to the > * plane or the CRTC (e.g. for the background color, which currently is not > * exposed and assumed to be black). Hi Simon, thank you! :-D I have no idea if that's correct though, but also nothing against it, and it does help with what I ranted about in https://lists.freedesktop.org/archives/wayland-devel/2021-September/041993.html so is it appropriate to offer my Acked-by: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx> ? Thanks, pq
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