[Bug 90789] Vsync doesn't work for rotated display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90789

--- Comment #4 from Michel Dänzer <michel at daenzer.net> ---
Created attachment 120682
  --> https://bugs.freedesktop.org/attachment.cgi?id=120682&action=edit
Add support for transforms to separate scanout buffer  infrastructure

Here's a preliminary patch for this, which should reduce tearing even without
Option "TearFree" and eliminate it with the option enabled.

Note that for 90/270 degree rotation, you'll need to patch xserver with
http://lists.x.org/archives/xorg-devel/2015-December/048377.html or to disable
the HW cursor with Option "SWcursor".

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