[Bug 745107] glimagesink: implement GstVideoOverlayCompositionMeta

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from kevin <kevinbing.song at gmail.com> ---
kevin_> so you focus on glimagesink implement video overlay composite?
<kevin_> do you sync with Julien Isorce?
https://bugzilla.gnome.org/show_bug.cgi?id=723761
<kevin_> do you care about gltextoverlay.text_sink?
<kevin_> Use an external GL Font API to build a separate gltexture and attach
it to the input buffer's GstVideoOverlayCompositionMeta. Then a downstream
element could call gst_video_overlay_composition_blend to show up the
subtitles.
<kevin_> So gltextoverlay still can do video composite with GL even if
downstream element can't support GstVideoOverlayCompositionMeta? I also need
this use case.
<kevin_> how about timeoverlay? do still need gltimeoverlay?
<kevin_> so GstBaseTextOverlay based on GL is really needed?
<lubosz> i was considering using glyphy for font rendering
<lubosz> but we prefer pango atm
<lubosz> the bug from julien isorce was marked as duplicate, and later unmarked
<lubosz> is there already a gltextoverlay element??
<lubosz> GstBaseTextOverlay won't be based on GL with my work
<lubosz> the sink will support compositing the buffers in hardware
<lubosz> the font will still be rendered on the cpiu
<lubosz> but the textoverlay won't do it's slow compositing anymore

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