[Bug 681447] video overlay composition: fix video blending over transparent frame

[GStreamer (bugzilla.gnome.org)]

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

--- Comment #12 from Andreas Frisch <fraxinas at opendreambox.org> 2014-11-10 10:18:29 UTC ---
Created an attachment (id=290325)
 View: https://bugzilla.gnome.org/attachment.cgi?id=290325
 Review: https://bugzilla.gnome.org/review?bug=681447&attachment=290325

unit test for video blending over transparent frame

basically blending a 100x50 white (0xFF) box in the right half of a 200x50
transparent (0x00) frame and checking to see whether the alpha byte is set to
0xFF.
without this patch, the alpha byte stays 0x00 and thus the test will fail.

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