[Bug 701095] videomixer: Should implement pass-through and optimizations

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701095
  GStreamer | gst-plugins-good | 1.x

--- Comment #3 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2013-05-28 13:46:37 UTC ---
(In reply to comment #2)
> This is not catching all cases. You could have a top pad that is larger than
> fullscreen, which could have negative x/y-pos and still fill the complete
> frame. Or could have negative x/y-pos and not fill the complete frame.

Great ! that's why I like reviews, I'll give it a second try later. Could it be
something like:

(top_pad->alpha == 1.0
   && (top_pad->info.width - top_pad->xpos) > mix->info->width
   && (top_pad->info.height - top_pad->ypos) > mix->info->height)

Just throughing this, let me know if on have more cases.

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