exaModifyPixmapHeader_mixed on screen pixmap

[fly fancy]

Hello, all
         In exaModifyPixmapHeader_mixed, when pPixData is not NULL, it'll
destroy driver private of the pixmap and set the pixmap pinned and
non-offscreen. So, how about screen pixmap creation? Screen pixmap will be
set to unaccelerable according to this implementation of
exaModifyPixmapHeader_mixed. But this is not reasonable. Can someone help?
Thanks!

Best wishes

fancyfly
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