Re: [EXTERNAL] Re: Issue with PDF printing via cairo library – Proposed Patch

[Luca Bacci]

According to the following links, things should work if you add an SSH key
to your account <https://docs.gitlab.com/user/ssh/>:

   - https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/3294
   - https://gitlab.gnome.org/GNOME/glib/-/issues/3613#note_2354778

Let me know if you still encounter any issues!

Best Regards,
Luca

Il giorno ven 25 lug 2025 alle ore 15:32 Vladimir Gribko <
Vladimir.Gribko at cib.de> ha scritto:

> Hello Luca Bacci,
>
>
>
> Thank you for reviewing the proposed changes.
>
>
>
> Today, I attempted to create a merge request but encountered an issue:
>
> I logged into gitlab.freedesktop.org using my GitHub account (vladgrind)
> and tried to fork the Cairo repository into my projects.
>
> However, I received the following warning:
>
>
>
> "Limit reached. You cannot create projects in your personal namespace.
> Contact your GitLab administrator."
>
>
>
> Could you please advise on how to proceed? Alternatively, would it be
> possible for one of the Cairo developers to add the changes into their
> branch for merging?
>
>
>
> Thank you very much for your support.
>
>
>
> Best regards,
>
> Vladimir.
>
>
>
> *From:* Luca Bacci <luca.bacci982 at gmail.com>
> *Sent:* Wednesday, July 23, 2025 9:30 AM
> *To:* Vladimir Gribko <Vladimir.Gribko at cib.de>
> *Cc:* cairo at cairographics.org; Patrick Fritzsch <Patrick.Fritzsch at cib.de>
> *Subject:* [EXTERNAL] Re: Issue with PDF printing via cairo library –
> Proposed Patch
>
>
>
> You don't often get email from luca.bacci982 at gmail.com. Learn why this is
> important <https://aka.ms/LearnAboutSenderIdentification>
>
> Thanks, this looks like a sensible change. Could you open a Merge Request
> at https://gitlab.freedesktop.org/cairo/cairo/-/merge_requests?
>
>
>
> Best Regards,
>
> Luca
>
>
>
> Il giorno mar 22 lug 2025 alle ore 16:38 Vladimir Gribko <
> Vladimir.Gribko at cib.de> ha scritto:
>
> Hello cairo developers,
>
>
>
> I am a C++ developer at CIB software GmbH, and we use cairo for rendering
> and printing PDF documents within our product, CIB pdf toolbox 2.
>
> Recently, we encountered an issue when printing certain PDF with the
> "Microsoft Print to PDF" printer: the output PDF appeared distorted.
>
> We couldn't find a problem in our code, and for further testing we printed
> this PDF, using the well-known open-source utility pdftocairo:
>
>
>
> > pdftocairo.exe -print -printer "Microsoft Print to PDF" input.pdf
> output.pdf
>
>
>
> We observed the same result with pdftocairo and therefore suspected a
> problem in the cairo code.
>
>
>
> Upon analyzing the problem, we identified two issues within the function
> _cairo_win32_printing_surface_paint_recording_pattern():
>
>
>
> 1. The use of an uninitialized variable, is_subsurface.
>
> 2. Displaced ClipPath for the pattern being printed, which leads to the
> distorted output.
>
>
>
> We have developed a patch addressing these two issues and would like to
> propose it for inclusion in the cairo code.
>
> Additionally, I have attached the minimized input.pdf and the distorted
> output.pdf obtained with pdftocairo.
>
> So, please review and share your feedback.
>
> Thank you for your attention.
>
>
>
> Best regards,
>
> Vladimir Gribko.
>
>
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