[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 #6 from jeff at infidigm.net  2007-08-29 20:19 PST -------
Adding support for this to the cairo backend will require some work. Supporting
knockout groups requires tracking shape and opacity seperately. The cairo
backend currently implements transparency groups using cairo_push/pop_group,
but these do not help with tracking shape. However, support should be possible
by tracking shape with an additional CAIRO_CONTENT_ALPHA surface.


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