[Poppler-bugs] [Bug 102356] New: Arthur backend uses incorrect miter join style

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102356

            Bug ID: 102356
           Summary: Arthur backend uses incorrect miter join style
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: arthur backend
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: oliver.sander at tu-dresden.de

Created attachment 133666
  --> https://bugs.freedesktop.org/attachment.cgi?id=133666&action=edit
pdf file to trigger the bug

The Arthur render backend implements the 'Miter' line join style incorrectly. 
You can see this with the attached test file.  It contains a polygon with two
corners positioned such that the miter limit is exceeded.  The pdf standard
requires that in such a case, the miter join is converted to a bevel join:

  http://www.verypdf.com/document/pdf-format-reference/pg_0217.htm

The Arthur backend, however, simply shortens the miter a little bit.  This
results in the spike that can be seen on the screenshot.

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