[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

Yes, the QPDF task is now done, too. Thank for all the hard work on
this, Jay.

** Changed in: qpdf (Ubuntu)
   Status: Triaged => Fix Released

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  Cannot print a PDF with AcroForms using fit-to-page

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Jay Berkenbilt]

I think this bug can be closed now, right?

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  Cannot print a PDF with AcroForms using fit-to-page

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Launchpad Bug Tracker]

This bug was fixed in the package cups-filters - 1.17.4-0ubuntu1

---
cups-filters (1.17.4-0ubuntu1) artful; urgency=medium

  * New upstream release
- pdftopdf: If the input PDF file contains an interactive
  form, flatten it to static PDF so that further manipulation,
  like scaling, number-up, ... do not let the filled for
  content getting lost. This is implemented by using the
  pdftocairo utility of Poppler and if this fails Ghostscript
  (9.22 or later recommended). This will probably replaced by
  a QPDF-based solution later. Thanks to Tobias Hoffmann for
  the QPDF-based detection of PDF forms (Upstream bug #1315,
  LP: #1564249).

 -- Till Kamppeter   Sun, 10 Sep 2017 16:14:50
-0300

** Changed in: cups-filters (Ubuntu)
   Status: Fix Committed => Fix Released

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

For the time being (cups-filters 1.17.4) I have now applied a solution
where pdftopdf detects PDF forms using QPDF (thanks to Tobias Hoffmann,
smilingthax) and if there is a form uses and external utility for the
flattening, preferrably pdftocairo, if not present, Ghostscript. After
the flattening the original treatment by QPDF is performed.

If none of the utilities is available, no form-flattening is performed
(but as cups-filters-core-drivers depends on poppler-utils, pdftocairo
is always there).

The originally planned QPDF-based solution is still in the works and
will most probably added in a later release of cups-filters. Therefore
the QPDF task stays open.

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  Cannot print a PDF with AcroForms using fit-to-page

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

** Changed in: cups-filters (Ubuntu)
   Status: Triaged => Fix Committed

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  Cannot print a PDF with AcroForms using fit-to-page

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Jay Berkenbilt]

I'll have to study it. Sorry, I have been quite starved for time to work
on qpdf. I would like to fix this, but I can't commit to a timeframe.

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  Cannot print a PDF with AcroForms using fit-to-page

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

Jay, what about implementing PDF form flattening in QPDF? As suggested
in comment #13?

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Dmitry]

The trick with ps2pdf works fine. I am able to convert to a static PDF
and then print it with fit-to-page.

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

Jay, would you be able to add PDF form flattening functionality like
implemented in

https://gist.github.com/jribble/beddf7620536939f88db

into QPDF? Or is a real PDF interpreter (Ghostscript, Poppler, MuPDF)
needed for this?

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

Jay, QPDF could be used for identifying whether a file contains forms or
not. See

https://bugs.linuxfoundation.org/show_bug.cgi?id=1315

nad there comment #9 with the link to

https://github.com/smilingthax/pdfformflatten

This code identifies PDFs with forms but does not actually flatten them.
pdftopdf could use this and if a form is found pass the PDF through
Ghostscript/Poppler/MuPDF to flatten it and after that do the usual QPDF
treatment of pdftopdf.

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Jay Berkenbilt]

If I'm reading this correctly, it looks like there's no short-term
change to qpdf required. Is that correct? I'm thinking doing this type
of flatting in qpdf is probably out of scope, but in any case, I
wouldn't have time to work on it any time soon. I haven't studied
interactive forms enough to know exactly what would be involved.

There are certainly limitations of just directly printing PDF, and it's
unlikely that qpdf or a filter that only does structural transformation
will ever be able to handle all these kinds of issues.

If I've misread this and there is something expected to be done with
qpdf in the short term, please clarify so I don't inadvertently decide
not to do something that needs to be done. Thanks.

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

I meant ps2pdf, as ps2pdf generates PDF. It was originally made for
converting PostScript to PDF, but it works also with PDF as input as
Ghostscript accepts also PDF as input. This way it converts PDF (non-
static) to PDF (static). So use ps2pdf as shown in my comments above.

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Dmitry]

I'll try pdf2ps (did you mean that?). I cannot try any of X11
applications since X11 is not installed there and I have no control over
that.

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

I have done the tests of my previous comment with the attached file and
printing this way works, meaning that both evince and Ghostscript re-
generate the PDF file for printing, so that a static file is sent.

A point of improvement for cups-filters would be here to let pdftopdf
somehow recognize that the incoming PDF has non-static content and if
so, running it through some Ghostscript/Poppler/MuPDF command line
utility for flattening the file into a completely static one.

** Changed in: cups-filters (Ubuntu)
   Status: Incomplete => Triaged

** Changed in: qpdf (Ubuntu)
   Status: Incomplete => Triaged

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

Dmitry, can you print your filled-form PDF when opening it in a PDF
viewer (evince, some KDE viewer, ...) set fit-to-page in the printing
options in the print dialog and print? The viewers usually re-generate
the PDF in a simpler way with the interactive forms replaced by static
PDF content and send that to the printing subsystem.

Try also

ps2pdf PDFForm3.pdf - | lpr -o fit-to-page

ps2pdf runs your PDF through Ghostscript, which also re-generates it in
a static form.

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Tobias Hoffmann]

For example, here some java/PDFBox-based implementation of how to flatten 
simple forms:
 https://gist.github.com/jribble/beddf7620536939f88db
(IIRC there are more form elements than those 2-3 handled here(?)).

Note that QPDF does not have something like the PDAcroForm class (and
its friends) used there to easily access the form data. So any QPDF/C++
based form flattener has to implement that, too.

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Tobias Hoffmann]

See https://bugs.linuxfoundation.org/show_bug.cgi?id=1315 why this cannot work.
And QPDF won't be able to do anything about it, either...
There might even be PDF-capable printers on the market (i.e. where the 
rasterization is not done by gs / poppler on the host), where the form content 
will not be printed even without the fit-to-page option.

The PDF format generally does not allow arbitrary transformations (as used by 
pdftopdf in certain cases) to be applied to the ("interactive") Form content - 
which is stored separately from the Page content. 
The usual solution for printing is that the viewer application (Evince, Google 
Chrome, ...) converts (hard-codes) any Form content into regular Page content 
before sending the data to the printing chain. Using lpr skips this 
(non-trivial) step.


** Bug watch added: bugs.linuxfoundation.org/ #1315
   https://bugs.linuxfoundation.org/show_bug.cgi?id=1315

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Dmitry]

Till Kamppeter (till-kamppeter),

I tested in Xenial too (see the head message), and it has the same
issue. However I cannot use Xenial since I cannot upgrade from 14.04 for
some specific reasons.

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

Most probably this is a QPDF problem. QPDF is the PDF processing library
used by pdftopdf, the filter which processes fit-to-page.

Created an upstream bug report on QPDF:

https://github.com/qpdf/qpdf/issues/72

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Till Kamppeter]

Can you try the newest Ubuntu version (life image on USB or DVD)? Does
the problem persist there?


** Changed in: cups (Ubuntu)
   Status: New => Incomplete

** Package changed: cups (Ubuntu) => cups-filters (Ubuntu)

** Also affects: qpdf (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: qpdf (Ubuntu)
   Status: New => Incomplete

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[Bug 1564249] Re: Cannot print a PDF with AcroForms using fit-to-page

[Dmitry]

** Description changed:

  Using KUbuntu 14.04. I am trying to print the attached PDF with filled
  forms (AcroForms) with the following command:
  
  lpr -o fit-to-page PDFForm3.pdf
  
  But my Samsung ML-1210 prints the document with empty forms. If I omit
  -o fit-to-page then all the forms keep the filled data.
  
  --
  
  # lsb_release -rd
  Description:Ubuntu 14.04.4 LTS
  Release:14.04
  
  # apt-cache policy cups
  cups:
-   Installed: 1.7.2-0ubuntu1.7
-   Candidate: 1.7.2-0ubuntu1.7
+   Installed: 1.7.2-0ubuntu1.7
+   Candidate: 1.7.2-0ubuntu1.7
+   Version table:
+  *** 1.7.2-0ubuntu1.7 0
+ 500 http://ftp.byfly.by/ubuntu/ trusty-updates/main i386 Packages
+ 500 http://security.ubuntu.com/ubuntu/ trusty-security/main i386 
Packages
+ 100 /var/lib/dpkg/status
+  1.7.2-0ubuntu1 0
+ 500 http://ftp.byfly.by/ubuntu/ trusty/main i386 Packages
+ 
+ CUPS in Xenial (from here: http://cdimage.ubuntu.com/daily-live/current
+ /xenial-desktop-i386.iso) has the same issue. Xenial:
+ 
+ # lsb_release -rd
+ Description:  Ubuntu Xenial Xerus (development branch)
+ Release:  16.04
+ 
+ # apt-cache policy cups
+ cups:
+   Installed: 2.1.3-3
+   Candidate: 2.1.3-4
Version table:
-  *** 1.7.2-0ubuntu1.7 0
- 500 http://ftp.byfly.by/ubuntu/ trusty-updates/main i386 Packages
- 500 http://security.ubuntu.com/ubuntu/ trusty-security/main i386 
Packages
+  2.1.3-4 500
+ 500 http://by.archive.ubuntu.com/ubuntu xenial/main i386 Packages
+  *** 2.1.3-3 100
  100 /var/lib/dpkg/status
-  1.7.2-0ubuntu1 0
- 500 http://ftp.byfly.by/ubuntu/ trusty/main i386 Packages

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