[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

--- Comment #12 from Vineeth <vineeth.tm at samsung.com> 2014-10-28 14:07:49 UTC ---
@Sebastian 
in case src width is above the dest width then it does get clipped

This scenario is when x pos is outside the frame dest width. In that case there
will no text to be displayed. Hence i thought this fix is valid

@Tim
i will try to add a test case tomorrow 
right now i can't test using textoverlay as the fix is already applied to that.
Are you aware of any other element which uses video-blend?

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