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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #9 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 373755
  --> https://bugzilla.gnome.org/attachment.cgi?id=373755&action=edit
cairooverlay: Add property for drawing on a transparent surface and then
blending

This allows us to use the GstVideoOverlayComposition API and correctly
handle pre-multiplied alpha, while also only doing the alpha conversion
once instead of twice for the whole frame.

At a later point we can attach the meta to the buffer instead of
blending ourselves if downstream supports that.

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