[Bug 759867] gl: Add support to compose VideoOverlayCompositionMeta before the display sink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759867

--- Comment #13 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Cool stuff, I have one concern though, the font rendering will be low res if
input streams are scaled during composition. That's slightly related to
Sebastian comment I must admit. We also add one render pass per input streams,
while adding composition overlay to the buffer being composed seemed more
efficient.

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