[cairo-bugs] [Bug 103840] New: Bug rendering lines of a certain length

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Nov 22 04:13:05 UTC 2017


            Bug ID: 103840
           Summary: Bug rendering lines of a certain length
           Product: cairo
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: chris at chris-wilson.co.uk
          Reporter: matthew.khouzam at gmail.com
        QA Contact: cairo-bugs at cairographics.org

Created attachment 135656
  --> https://bugs.freedesktop.org/attachment.cgi?id=135656&action=edit
Example code to generate bug

Hi, I am trying to draw lines, and the width seems to get very large when
certain lines coordinates are picked.

It appears to have been brought in with 

5bc1b1f6aac108d9a3963352ad774bb4fcd69e28 is the first bad commit
commit 5bc1b1f6aac108d9a3963352ad774bb4fcd69e28
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Aug 24 17:22:34 2012 +0100

    stroke: Make the incremental trapezoid stroker optionally available again

    Whilst it cannot handle self-intersecting strokes (which includes the
    antialias region of neighbouring lines and joints), it is about 3x
    faster to use than the more robust algorithm. As some backends delegate
    the rendering, the quality may still be preserved and so they should be
    responsible for choosing the appropriate method for generation of the
    stroke geometry.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

It affects the java bindings and the SWT library. Here is the eclipse bug
describing the problem even further.


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