[Bug 739281] video-blend: correct improper logic calculations

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739281
  GStreamer | gst-plugins-base | unspecified

Sebastian Dröge (slomo) <slomo> changed:

           What    |Removed                     |Added
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                 CC|                            |slomo at coaxion.net

--- Comment #10 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-10-28 13:16:22 UTC ---
This should be checked inside that function IMHO, and if there are values
outside the frame I would clip (and not render nothing).

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