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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #10 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 373756
  --> https://bugzilla.gnome.org/attachment.cgi?id=373756&action=edit
cairooverlay: Pre-multiply and un-premultiply alpha in case of ARGB32

Cairo expects pre-multiplied alpha, we work on un-premultiplied alpha.

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