[Poppler-bugs] [Bug 12185] Poppler does not correctly handle knockout groups

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=12185





------- Comment #1 from cworth at cworth.org  2007-08-27 13:46 PST -------
Created an attachment (id=11295)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=11295&action=view)
PDF file demonstrating bug (over-below-source)

This file should show a vector, translucent green circle with an image
of a traslucent, red triangle above it, but in a knockout group so
that it completely obscures the circle.

Expressed in cairo terms, the circle is rendered with the OVER
operator, while the triangle is rendered with the SOURCE operator.

Currently, poppler is blending the triangle with the circle, rather
than obscuring the circle.

I've verified that acroread renders the file as desired.

I'll attach a couple of renderings to make things clear.

-Carl


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