[Libva] Filling in surface with black pixels

[Ratin]

Hi All,
  Is there an efficient alternate method of filling a surface with lets say
all black pixels rather than using vaPutsurface with a black background
image? Trying not to use glx for that because of some issues I am seeing
mixing glx contexts / swapbuffer calls on windows associated with VAAPI
surfaces..

Ratin
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