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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
It's a simple bug in cairooverlay, unrelated to any other code :)

Our ARGB is un-pre-multipled, Cairo's is pre-multiplied. As such we need to
convert before passing to Cairo, and another time in reverse after getting the
data from Cairo.

In textoverlay (where we also use Cairo) it's handled correctly.

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