[Poppler-bugs] [Bug 63587] Text missing from PDFs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63587

--- Comment #5 from Thomas Freitag <Thomas.Freitag at alfa.de> ---
Created attachment 78269
  --> https://bugs.freedesktop.org/attachment.cgi?id=78269&action=edit
consider a softmask transfer function always

It's not a core problem even if it seems so because cairo has the same problem:

The PDF uses a softmask with a transfer function which inverts everything, but
the output devices, especially splash, ignores this transfer function when
alpha is set to true. Therefore the softmask knocks out everything instead of
just remove the background transpareny.

The patch solves it for splash, probably it's quite easy to do the same in
cairo for a cairo specialist.

BTW, the patch also changes the output for some defect PDFs in my PDF suite
(bug-poppler30228.pdf, bug-poppler10910.pdf, tauya.f8.pdf), but because they
are damaged I couldn't compare the output with acrobat.

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