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

[Luca Bacci]

 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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