[Libva] Semantics of VA_CLEAR_DRAWABLE

[Gwenole Beauchesne]

Hi,

The documentation mentions that the VA_CLEAR_DRAWABLE flag "clears the 
drawable with background color". My understanding is the driver will clear 
the drawable *prior* to rendering the surface. However, the PSB driver 
does clear the drawable but doesn't render the surface. What's the 
intended purpose of this flag?

If VA_CLEAR_DRAWABLE just clears the drawable without rendering the 
surface, that's a pretty useless flag as people can call XClearWindow() 
themselves with fewer arguments.

So, I would really want VA_CLEAR_DRAWABLE to mean the following:
"clears the drawable with background color prior to rendering the 
surface". Thus, a fix in PSB is also welcome. ;-)

Thanks,
Gwenole.