[Bug 595520] Implement a generic cairo overlay

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=595520
  GStreamer | gst-plugins-good | git

--- Comment #11 from Jon Nordby <jononor at gmail.com> 2011-02-26 18:48:48 UTC ---
Thanks for review, working on the issues now.

The color conversions are the heavy operations here, so unless you happen to
have RGB data in your pipeline at the appropriate place you will take a
significant performance hit.
A possible work-around is to move YUV<->RGB conversion into the element (but
also accept RGB), having a boolean property "enabled", and only doing the
conversions+drawing if it is true. I will not do this, but I'm not opposed to
someone else adding it.

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