[Nouveau] [Bug 35930] flickering in many OpenGL applications with composition manager

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=35930

--- Comment #17 from maximlevitsky at gmail.com 2011-05-22 02:49:18 PDT ---
I understand that, but nouveau_dri2_finish_swap in DDX is called for both
window DRI buffers and scanout buffers.

It seem that DRI2CanFlip filters indeed only full screen buffers, but I don't
understand why it returns TRUE for all pixmaps.
Aren't pixmaps not on the screen at all?
Or it never called with pixmaps but only with windows.

As far as I understand it, from very old memories of tinkering with X windows
systems, pixmaps and windows are supposed to be interchangeable in X draw
calls, just windows can be displayed, while pixmaps are strictly of-screen and
can only be blitted to some window

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