[Bug 766538] glimagesink: New signal for after redraw has happened

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766538

--- Comment #2 from Gregoire <gregoire at gentil.com> ---
My case is really to add an overlay after the frame has been rendered. I don't
touch the frame content and its rendering. So I prefer to let Gstreamer does
the frame rendering (it's well optimized and if something changes in the
future, it will be in the glimagesink code) and once it's done, I paint my
opengles stuff.

In a sense, my use case is very similar to this gstreamer feature that can do
overlay on top of glimagesink (I don't recall the name and I can't find it). I
experimented but my overlay is pure opengles so it was too limiting.

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