[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 #8 from Arnaud Vrac <rawoul at gmail.com> 2013-11-30 02:37:19 UTC ---
Yes, the code is probably not very fast :) However, in the new code, no
operation is done when the source pixel has zero alpha, so it's probably faster
than the previous code since most overlays have a lot of transparent pixels.

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