[Bug 753821] New: assrender: improve overlay blending performance

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753821

            Bug ID: 753821
           Summary: assrender: improve overlay blending performance
    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: rawoul at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 309575
  --> https://bugzilla.gnome.org/attachment.cgi?id=309575&action=edit
optimize blending

Skip empty source pixels when blending an image. There can be hundreds          
of images to blend at each frame, so this brings a nice performance
boost.

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