[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

Vineeth <vineeth.tm> changed:

           What    |Removed                     |Added
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 Attachment #289516|0                           |1
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--- Comment #25 from Vineeth <vineeth.tm at samsung.com> 2014-11-03 07:53:48 UTC ---
Created an attachment (id=289871)
 View: https://bugzilla.gnome.org/attachment.cgi?id=289871
 Review: https://bugzilla.gnome.org/review?bug=739281&attachment=289871

video-blend update logic calculations

After checking the existing logic and based on Tim's comment on how to render
based on different values of x,y,overlay_width and overlay_height

and as per the test cases attached in the other patch, have made changes in
video-blend to handle these different cases. Please check if they are valid.

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