[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 #5 from Vineeth <vineeth.tm at samsung.com> 2014-10-28 10:56:57 UTC ---
yes textoverlay is not the only user..

but whoever uses video-blend should take care of this.
as any value of x/y < 0 and x/y > image_width/height is invalid and should be
reset to 0.


in case any other user of video-blend does not set this.. 
let us say x is being sent as -2000

now as per the calculation src_width will be width of text, which will be
around 61 for "text" - 2000, will become 61 - 2000 = -1939 which is an invalid
value
hence the calculation is wrong.

another option to fix this will be(in case the users of video-blend does not
take care of resetting to 0) 

if(x < 0 && x > dest_width)
 x = 0;
if(y < 0 && y > dest_height)
 y = 0;

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