[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 #3 from Florent Thiery <florent.thiery at ubicast.eu> ---
Are you saying that the font rendering will be rendered in software, then
uploaded to the GPU as RGBA ? If so, why not adding
meta:GstVideoOverlayComposition support to the existing gloverlay element
(which is, if i'm not mistaken, currently targeted at image files overlays).

The only aspect that troubles me with the approach that Nicolas suggests is the
requirement for developers to know/guess that a non-dedicated element (whose
name isn't text-related) is required for the actual rendering to be effective.
Ease of use / elegance-wise, i think it would be better to add memory:GLMemory
support to text/timeoverlay elements directly, so that if the element is added
within a GL section, it will perform adequately.

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