OTF fonts not properly rendering about prawn HOT 11 CLOSED

I'm also having issues with OTF fonts. In my case, I'm loading a Noto font as a fallback_font, and the characters missing from my base font simply render as whitespace when trying to use the OTF

OTF (with whitespace highlighted)

TTF

    pdf-core (0.9.0)
    prawn (2.4.0)
      pdf-core (~> 0.9.0)
      ttfunk (~> 1.7)
    ttfunk (1.7.0)

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I'm also having issues with OTF fonts. At least on windows machines, on the mac it worked for me.
My workaround was to convert the OTF fonts to TTF.
With TTF fonts the problem disappeared.

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@leonvogt Do you experience the issue with git versions of TTFunk and Prawn?

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@pointlessone I'm not quite sure I understand your question.
I'm using the released versions on rubygems.org and not the main/master branches, if that's what you mean.
I'm using the following versions:

prawn (2.4.0)
  pdf-core (~> 0.9.0)
  ttfunk (~> 1.7)

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@leonvogt Yeah, that's what I mean. It was a while since last release and a few bugs have been fixed since. Could you please try master and let me know if your issue has been fixed or not?

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I quickly tested with the current version in the master branch, sadly the problem still exists.
Even worse, with the current version it also incorrectly renders the OTF fonts on the macOS system (14.2.1).

Used font: Gilroy
Same font with TTF files are no problem and will get rendered fine.

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@leonvogt Could you please provide a minimal script that demonstrates the issue, list versions/commit hashes for prawn, pdf-core, and ttfunk gems, and link to the exact font?

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@pointlessone sure, I'll try to create a minimal setup in the coming days.

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@pointlessone while creating the sample repository I noticed that the most issues are resolved with the current master branch. In my previous comment I mentioned that the issue is still present in the current master branch. Thing is, I only used the current prawn master branch and not the current pdf-core master branch or ttfunk master branch.
So most things are working now for me.
One problem I still encountered is that Umlaute are not displayed correctly with .otf fonts.
Here a sample repository: https://github.com/leonvogt/prawn-otf-font-issue
One thing to mention: I didn't test different fonts. I only tested the mentioned Gilroy font.

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@leonvogt I think I've fixed the Umlaute issue. Could you please take another look?

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I'll assume that everyone's busy but everything's OK.

Please a new issue if you find things are not in order.

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