[cairo-bugs] [Bug 31589] New: Very high cpu usage of _cairo_bentley_ottmann_tessellate_polygon() in transmission-gtk

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31589

           Summary: Very high cpu usage of
                    _cairo_bentley_ottmann_tessellate_polygon() in
                    transmission-gtk
           Product: cairo
           Version: 1.10.0
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: temp.20.nurkle at spamgourmet.com
         QAContact: cairo-bugs at cairographics.org


A code path involving
  pango_cairo_layout_path (cr, layout);
  murrine_set_color_rgba (cr, &temp, 0.5);
  cairo_stroke (cr);

, in Ambiance, ubuntu's default theme, in the application transmssion-gtk,
leads to an amazing amount of cpu usage primarily in
_cairo_bentley_ottmann_tessellate_polygon().

Bug https://bugs.launchpad.net/ubuntu/+source/transmission/+bug/655024 has lots
of detail.

(non-murrine-based themes are still fine; other murrine themes Radiance and
MurrinaChrome have same effects.)

The possibility that it is not cairo but incorrect invocation of it has not
been eliminated. Pango is the least-researched area in this regard.

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