[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

Jon Nordby <jononor> changed:

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--- Comment #12 from Jon Nordby <jononor at gmail.com> 2011-02-27 16:36:34 UTC ---
Created an attachment (id=182044)
 View: https://bugzilla.gnome.org/attachment.cgi?id=182044
 Review: https://bugzilla.gnome.org/review?bug=595520&attachment=182044

Patch v2

Updated patch. I have incorporated all the suggested changes, including:
- Conditional compiling, only build if cairo-gobject 1.10 is available
- A signal emitted at setcaps time, passing the GstCaps* to signal handlers
- Pass timestamp and duration in draw signal
- Updated example and added to tests/examples/cairo
- Documentation for element and its signals

Right now I'm only passing the input caps to signal handlers.
Do we want to pass the output caps as well? Should signal handlers be allowed
to change the output caps?

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