[Poppler-bugs] [Bug 26261] New: Two adjacent filled rectangles of the same colour have a line between at certain zoom levels

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26261

           Summary: Two adjacent filled rectangles of the same colour have a
                    line between at certain zoom levels
           Product: poppler
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: cairo backend
        AssignedTo: poppler-bugs at lists.freedesktop.org
        ReportedBy: Deri.James at chuzzlewit.co.uk


Created an attachment (id=32838)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32838)
PDF showing adjacent squares

The attached pdf illustrates the problem. View it with okular or evince and you
will see a line appear between the squares at certain zoom levels (i.e. 60% in
okular).

There are 3 examples in the PDF:

A) Two filled squares on a black background (the line is dark red)
B) Two filled squares on white background (the line is pink)

It seems the line is produced by antialiasing not taking into account adjacent
objects, just the background.

C) These two squares are produced using both fill & stroke (with a stroke width
of zero). The separating line does not appear (at any zoom level) and the
amount of antialiasing is 50% of what it was.


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