[Poppler-bugs] [Bug 102036] New: [PATCH] Arthur backend renders highlight annotations wrongly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102036

            Bug ID: 102036
           Summary: [PATCH] Arthur backend renders highlight annotations
                    wrongly
           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 133245
  --> https://bugs.freedesktop.org/attachment.cgi?id=133245&action=edit
Patch that implements ArthurOutputDev::updateBlendMode

The Arthur backend renders highlight annotations wrongly.  The yellow
rectangles are simply rendered on top of the highlighted text, hiding that text
completely.

The obvious explanation was that the updateBlendMode method is not implemented
in ArthurOutputDev.  I therefore prepared a patch that implements that method. 
It is simple and self-contained.

Full disclosure: I actually took the implementation from the much larger patch
that Mihai Niculescu posted to the mailing list in

  https://lists.freedesktop.org/archives/poppler/2013-June/010370.html

That's why the patch contains Mihai's name in the copyright list.

Only, it doesn't solve the problem: With it, the yellow rectangles still hide
the text.  And I don't understand why this is.  When the ArthurOutputDev::fill
method that draws the yellow rectangle is called, the blend mode is
gfxBlendNormal, which I suppose means "draw right on top of it".  I need a hint
here.  What is the mechanism that allows me to see the highlighted text through
the rectangle, if it isn't the blend mode?  It doesn't seem to be opacity,
either.

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