[Bug 745107] glimagesink: implement GstVideoOverlayCompositionMeta

[GStreamer (GNOME Bugzilla)]

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

--- Comment #18 from Lubosz Sarnecki <lubosz at gmail.com> ---
Created attachment 305563
  --> https://bugzilla.gnome.org/attachment.cgi?id=305563&action=edit
Add class for managing GstVideoOverlayCompositionOverlay buffers

    Add a class to store and manage the OpenGL texture,
    vertex buffer and GstVideoOverlayRectangle.
    Transforms overlay coordinate space to vertex buffer space with aspect
ratios in mind.
    Provides methods for caps manipulation and overlay caching.

    = Example Pipelines =

    Simple pipeline

    gst-launch-1.0 videotestsrc ! \
      textoverlay text="Hello World" font-desc="sans bold 30" ! \
      glimagesink

    Display 3 static overlays at different positions

    gst-launch-1.0 videotestsrc ! \
      textoverlay text="text1" valignment="top" font-desc="sans bold 30" ! \
      textoverlay text="text2" halignment="right" font-desc="sans bold 30" ! \
      textoverlay text="text3" halignment="left" font-desc="sans bold 30" ! \
      glimagesink

    Display subtitle file over testsrc

    gst-launch-1.0 videotestsrc ! \
      textoverlay name=foo filesrc location=foo.srt ! subparse ! queue ! foo.
foo. ! \
      glimagesink

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