[Poppler-bugs] [Bug 77904] New: rasterisation issue when using TikZ's doube line

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77904

          Priority: medium
            Bug ID: 77904
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: rasterisation issue when using TikZ's doube line
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: yasinzaehringer-poppler at yhjz.de
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: general
           Product: poppler

Created attachment 97915
  --> https://bugs.freedesktop.org/attachment.cgi?id=97915&action=edit
Problematic PDF

Okular (the KDE document viewer) does not correctly rasterise the attached PDF
at certain (resolution-dependant) zoom levels. The problem is probably an
anti-aliasing issue when two rectangles with slightly different width are drawn
on top of each other to produce an equal sign. It seems to be a poppler issue
as Evince shows a similar bug, though not as drastic as Okular. I checked a few
other viewers, in particular Adobe Acrobat, and none of them showed the issue.
The LaTeX code to produce the PDF can be found here [1]. My Okular bug report
can be found here [2]. There you may also find a few screenshots which
illustrate the problem. I can confirm the bug on my KUbuntu 14.04 netbook with
poppler version 0.24.5. However, the bug isn't new, it is at least 2 years old.

[1]
http://tex.stackexchange.com/questions/168071/tikz-double-line-rasterisation-issue
[2] https://bugs.kde.org/show_bug.cgi?id=332900

Steps to Reproduce:
Load the PDF and try different zoom levels. (The 'bad' zoom levels seem to
dependent on the screen resolution.) On my netbook (1024x600), the issue
appears below 200%.

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