[Poppler-bugs] [Bug 107303] "8" shown instead of "x" inside checkbox when converting LibreOffice-generated form to PostScript

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107303

--- Comment #5 from Tobias Deiminger <haxtibal at posteo.de> ---
(In reply to Michael Weghorn from comment #3)
> The attached patch makes Poppler accept other tags for the ZapfDingbats font
> as well.
> 
> I'd be happy about feedback on the patch or other clarifications. (I'm far
> from being a Poppler expert...)
Hi Michael! I'm also far from being poppler expert, but I'd like to confirm
your approach. From standards perspective it doesn't matter if the tag is named
/ZaDB or /ZaDi or /whatever. What actually matters is: The tag needs a
corresponding entry in a resource font sub dictionary.

>From popplers perspective, we sometimes set forceZapfDingbats = true. Like with
the example document, where AnnotAppearanceBuilder::drawText is reached via
drawFormField => drawFormFieldButton [case formButtonCheck] => drawText.
Whenever forceZapfDingbats == true, the appearance Tf operand must match our
fake font resource that we hardcoded named "ZaDB". If the original DA Tf
operand was different, we need to replace it with "ZaDB".

Your patch ensures this, if I got it right, and therefore it's a good patch:)

We're having a similar discussion atm. here [0], and also here [1], because of
our current GSoC project. Maybe you have a look, esp. at the UML diagram [2]
that shows the relationship of the different font objects and give your two
cents if we're on the right track.

Btw., your attached PDF document is actually strange because it has a /DR entry
in the Annot dictionary, which is not specified for Widget Annotation
Dictionaries. At least not in PDF 1.7 32000-1:8. The /DR entry is meant to be
in the global AcroForm dictionary. Has this changed in PDF 2.0?

[0] https://bugs.freedesktop.org/show_bug.cgi?id=81748.
[1]
https://cgit.kde.org/scratch/dileepsankhla/okular-gsoc2018-typewriter.git/tree/bugs/poppler_81748
[2]
https://cgit.kde.org/scratch/dileepsankhla/okular-gsoc2018-typewriter.git/plain/bugs/poppler_81748/font_object_graph.dia

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