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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #4 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
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.

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