[cairo-bugs] [Bug 24797] cairo-path-stroke.c:1816: _cairo_rectilinear_stroker_line_to: Assertion `a->x == b->x || a->y == b->y' failed.

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=24797


Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk>  2009-10-30 01:13:18 PST ---
Thanks for bug report, having the trace was very useful, many many thanks.

commit 23bcf91748c4bb04c16e503b913da3bfc237463f
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Oct 30 07:49:56 2009 +0000

    path: Misclassification of rectilinear after degenerate line-to

    Malte Nuhn reported hitting an assertion:

      cairo-path-stroke.c:1816: _cairo_rectilinear_stroker_line_to: Assertion
`a->x == b->x || a->y == b->y' failed.
      http://bugs.freedesktop.org/show_bug.cgi?id=24797

    when stroking an apparently simple path:

      0 8.626485 m
      0 8.626485 l
      5.208333 2.5 l
      10.416667 2.5 l
      15.625 2.5 l
      20.833333 2.5 l
      26.041667 2.5 l
      31.25 2.5 l
      36.458333 2.5 l
      41.666667 2.5 l
      46.875 2.5 l
      52.083333 2.5 l
      57.291667 2.5 l
      62.5 2.5 l
      67.708333 2.5 l
      72.916667 2.5 l
      78.125 2.5 l
      83.333333 2.5 l
      88.541667 2.5 l
      93.75 2.5 l
      98.958333 2.5 l
      104.166667 2.5 l
      109.375 2.5 l
      114.583333 2.5 l
      119.791667 2.5 l
      125 2.5 l
      stroke

    which upon reduction becomes:

      0.000000 8.625000 m 5.207031 2.500000 l 125.000000 2.500000 l stroke

    The bug is that after spotting a repeated line-to we move the previous
    end-point without reclassifying the path, hence we miss the
    non-rectilinear step.

Hope this hasn't marred your enjoyment of Cairo, and you continue to have fun!


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