[Libva] [PATCH][G45] Handle cliprects in vaPutSurface()

[Gwenole Beauchesne]

Hi,

This patch adds support for clipping regions to vaPutSurface(). Actually, 
the approach I currently chose limits this to 80 cliprects. That should be 
more than enough though.

BTW, I am undecided whether we have to make i965_clear_dest_region() 
controlled by the VA_CLEAR_DRAWABLE flag or make it clear only the dest 
cliprects? What do you think?

This patch probably still needs some cleanups but it fits hwdecode-demos' 
`vaapi_h264 --clipping' provided we don't forcibly clear the dest region.

Regards,
Gwenole.
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