[Bug 752411] video-overlay-composition:move _GstVideoOverlayRectangle and _GstVideoOverlayComposition structs to their header file

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752411

--- Comment #2 from Sudip Jain <sudip.jain at st.com> ---
My objective is to compose subtitle/s using waylandsink at hardware composition
stage. And not blend using gstdvbsuboverlay element directly onto the video
frame (low performance)

For this, the video buffer is attached as overlay composition meta data by
gstdvbsuboverlay element. The rectangles are included in the composition.

I am using waylandsink and extract the meta data through  ometa =
gst_buffer_get_video_overlay_composition_meta (buffer);

And pull out rectangles, 
rect = ometa->overlay->rectangles[n];

These rectangles pixmap is copied on the weston subsurface interface, to be
composed by the hardware.

So what is wrong here ? And neither I think they should be kept private for any
reason.

I have implemented and tested this. Pretty much as explained here
http://permalink.gmane.org/gmane.comp.video.gstreamer.bugs/96170 and
http://lists.freedesktop.org/archives/gstreamer-bugs/2011-November/085507.html

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