[Bug 745107] glimagesink: implement GstVideoOverlayCompositionMeta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745107

--- Comment #14 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
To Kevin: Text overlay are not frequently updated and are small. Rendering text
in GL using vectorial data is slower then rendering to a buffer and uploading. 

So the idea is that we don't care at all about text rendering for this bug.
textoverlay or other subtitled element (like assrender) will render to an RGBA
buffer and attach it to the buffer to render. All we have to do is upload and
compose the buffer in the glimagesink element (and a utility in libgstgl of
course, at not everyone uses the sink).

This is fully implemented in cogl and clutter video sink.

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