[Bug 751484] New: Refactor compositor in order to have alpha sources blended over non alpha ones

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751484

            Bug ID: 751484
           Summary: Refactor compositor in order to have alpha sources
                    blended over non alpha ones
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jean-michel.hautbois at veo-labs.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The idea is to be able to compose a YUV with a AYUV into a YUV without having
to convert twice.

It could be useful to use porter/duff operations for this.
Needs some refactoring in compositor, in order to select the proper blend
function based on sources opacities.

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