[cairo-bugs] [Bug 26869] cairo 1.8.10 slows down firefox on sparc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=26869

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> 2010-06-13 02:00:34 PDT ---
This is unfortunate but that patch is a correctness fix as we cannot determine
when using XCopyArea is actually going to leave blank areas where the source is
clipped by children. This is an incorrect result.

A patch to perform the intermediate blit instead of falling back would be
appreciated. The alternatives are to do as Mozilla do and patch this out and
ignore the consequences, somehow determine whether an external drawable is a
pixmap or window on construction [this would be useful in any case], or fix
your Xserver to support XRENDER. The last option will the biggest performance
improvement.

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