[Bug 681447] New: [0.11] fix video blending over transparent frame

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=681447
  GStreamer | gst-plugins-base | git

           Summary: [0.11] fix video blending over transparent frame
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=220668)
 View: https://bugzilla.gnome.org/attachment.cgi?id=220668
 Review: https://bugzilla.gnome.org/review?bug=681447&attachment=220668

blending fix patch

The gst_video_blend function does not work as expected when blending over
transparent pixels, the destination alpha is not changed currently.

The attached patch implements standard OVER blending operation, and adds
support for missing premultiplied/non-premultiplied combinations for
source/destination frames.

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