[Libva] [PATCH][G45] Add vaDeriveImage()

[Gwenole Beauchesne]

Hi,

This patch implements vaDeriveImage() for the G45 driver. Tested with a 
newer version of MPlayer. In SW decoding mode (1080p MPEG-2), overall CPU 
usage is below 30% with vaDeriveImage() vs. 40% with vaCreateImage() + 
vaPutImage().

Note that with Xv, this is around 24%. So, some further optimisations 
could be done in MPlayer, namely by using direct rendering to the surface 
instead of using a temporary copy. But this is not possible for all 
codecs, e.g. H.264.

Regards,
Gwenole.
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