[Bug 667221] dvdspu: some optimizations

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=667221
  GStreamer | gst-plugins-bad | git

--- Comment #2 from Jan Schmidt <thaytan at noraisin.net> 2012-10-02 16:20:17 UTC ---
Review of attachment 204528:
 --> (https://bugzilla.gnome.org/review?bug=667221&attachment=204528)

The parts of this patch that assume a pixel is invisible if Y U & V are all 0
seem bogus. 0/0/0 is a valid YUV colour: Bright green. A pixel is only
invisible if the Alpha is 0. Otherwise, it seems useful to avoid blending
completely invisible pixel rows.

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