[Bug 797091] cairooverlay: passes un-premultiplied ARGB to Cairo

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797091

--- Comment #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Nicolas Dufresne (ndufresne) from comment #4)
> I don't kow what iss faster, but we could render to a separate RGB buffer,
> and then blend (with our existing blend function) on top of the video frame.
> This reduces at least the color washing caused by de-pre-multiplying.

I think we would want this behind a property. By first rendering to a
transparent surface and then blending it over the video you also get different
blending behaviour.

But it would also allow for using the overlay meta and e.g. not
downloading/uploading GL memories all the time.

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