[cairo-bugs] [Bug 76090] New: thin gap between adjacent/coincident filled areas

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76090

          Priority: medium
            Bug ID: 76090
          Assignee: chris at chris-wilson.co.uk
           Summary: thin gap between adjacent/coincident filled areas
        QA Contact: cairo-bugs at cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: brownrig at ucar.edu
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 1.12.16
         Component: general
           Product: cairo

Created attachment 95678
  --> https://bugs.freedesktop.org/attachment.cgi?id=95678&action=edit
Simple C-code to demonstrate the reported issue

We have had persistent problems with thin "gaps" appearing between two adjacent
fill areas that share a common, long, straight boundary.  A snapshot and a
simple program to reproduce the problem are attached.

The issue occurs persistently with the document-type backends, i.e., PDF, PS,
SVG.  It also occurs for the image surface as well, but can be eliminated by
turning antialiasing off.  

This has been observed for many versions of cairo over the past few years. We
have undertaken a number of work-arounds, with various levels of success, but
ultimately as seen by the test program, I think its fair to say this graphic
artifact should not be present.

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