[cairo-bugs] [Bug 75705] "double free or corruption" error appeares while i try to draw dotted line

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75705

--- Comment #5 from Massimo <sixtysix at inwind.it> ---
Created attachment 112338
  --> https://bugs.freedesktop.org/attachment.cgi?id=112338&action=edit
testcase

Apparently none of the tests in the test-suite exercises
tor22 scan converter, at least for the image backend.

Forcing CAIRO_ANTIALIAS_FAST and tolerance=1 to the context
before running the tests shows many tests would use tor22
scan converter, but no test crashes

This means that it is easier to add a new test based on the bug report
than to adapt an existing one. If you need a small image it is
sufficient the horizontal stroke, I've attached a patch as an example.
It is missing the license and copyright notice to let Sergey
choose it and receive the credit. 
The output is deliberately black on black, easy to get right for 
all backends.

BTW, according to grep, there is only another function named
glitter_scan_converter_reset (in src/cairo-clip-tor-scan-converter.c),
but it has a different signature and implementation: bugs there
would not be related to this report.

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