[Libva] [PATCH][RFC] Add vaQuery{Get,Put}ImageFormats()

[Gwenole Beauchesne]

Hi,

vaQueryImageFormats() returns the image formats supported by 
vaCreateImage(). However, some implementations may not support 
vaGetImage() or vaPutImage() with a particular format. In that case, it 
may be interesting to know about it beforehand, instead of having the user 
test the outcome of va{Get,Put}Image() and try another format.

It should also be possible to provide a default implementation right into 
va/va.c.

WDYT?

Regards,
Gwenole.
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