[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 #38 from Lazar Claudiu <lazar.claudiu.florin at gmail.com> 2014-11-05 20:37:44 UTC ---
I lost track of all the patches and not sure if I caused this or if it's a real
problem but can you guys try to overlay some text so that it exceeds the frame
width? 

Like this pipeline:

gst-launch-1.0 videotestsrc num-buffers=100 ! textoverlay text=TEST
font-desc='Sans 40' halignment=4 valignment=3 xpos=0 ypos=0 deltax=300 !
x264enc ! mp4mux ! filesink location=out.mp4


I've checked in basetextoverlay, there's no condition left to silence the
element when x+width > dest_width

video-blend.c gets called appropriately and src_width is clipped correctly
before it enters the blend loop.

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