copy pixmap to window

[Roman Bednarek]

Hi.
  I wonder if it is possible with the current shadow buffer, to perform
some operations i.e. copy pixmap to window, directly on the framebuffer?
I think that only this function may speedup every application which
uses double buffering.
  What do you think about it? Is it possible? Will it really speedup
something for example x11perf -copypixwin500?

Roman Bednarek