[cairo-bugs] [Bug 71833] New: Cairo 1.12+ very slow on Windows

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71833

          Priority: medium
            Bug ID: 71833
          Assignee: cairo-bugs at cairographics.org
           Summary: Cairo 1.12+ very slow on Windows
        QA Contact: cairo-bugs at cairographics.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: nicoduf at yahoo.fr
          Hardware: x86 (IA32)
            Status: NEW
           Version: 1.12.0
         Component: win32 backend
           Product: cairo

I'm currently updating some libraries for Inkscape on win32, and notice a
serious UI slowdown when updating the Cairo libs. Everything works as expected
with Cairo-1.11.2 (the dll we provide with the latest stable Inkscape version,
0.48.4), but the Inkscape UI becomes very slow when drawing or moving objects
on canvas with a more recent Cairo version (tested with 1.12.0, 1.12.8,
1.12.14, 1.12.16 and yesterdays git version). I've also updated Pixman to
0.32.4, but noticed no regression with the Pixman update as long as I don't
update Cairo too.
I've tried with different compilers (TDM-GCC-4.5, TDM-GCC-4.6 and
TDM-GCC-4.8.1) with no difference.

Other operating systems are not affected (tested on Debian stable with
Cairo-1.12.2 and Pixman-0.26, but other Inkscape users confirmed it's ok with
recent Ubuntu and OS-X versions).

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