[Poppler-bugs] [Bug 81624] Segfault in CairoOutputDev::endTransparencyGroup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81624

--- Comment #1 from Carlos Garcia Campos <carlosgc at gnome.org> ---
The crash was introduced in c40e2315. The problem is that when entering the
cairo work around in CairoOutputDev::setSoftMaskFromImageMask() we return early
without creating the transparency group, but
CairoOutputDev::unsetSoftMaskFromImageMask() assumes the transparency group is
always created. Checking groupColorSpaceStack in unsetSoftMaskFromImageMask to
return early fixes the issue, but I'm not sure that's the best way to check
whether we are in a transparency group or not.

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