How to add a new font to support Cyrillic?

[ciukstar]

Hello.

As I understand, the standard fonts provided by "Graphics.PDF.Fonts.Standard.Font" do not provide support for Cyrillic.
So I followed the HPDF/Test/onepage.hs example without success. The generated .pdf does not display Cyrillic text.
I have tried several other fonts besides DroidSans: OpenSans, DejaVuSans, FreeSerif, TimesNewRoman, all without success.

Note that I used fontforge to convert .ttf to .pfb and .afm files as below:
$ fontforge -lang=ff -c 'Open($1); Generate($2); Close();' DroidSans.ttf DroidSans.pfb
Some of them had issues with underscores (i.e. "_") and numeric digits (like "6") in .amf files when parsed with HPDF.

Is there anything else besides the example given on HPDF/Test/onepage.hs?
Or maybe it needs to be done in a completely different way?

Env:

LTS Haskell 19.22 (ghc-9.0.2)
HPDF 1.6.0

Thanks.

[hsyl20]

Hi,
Sadly I don't know how the existing .afm files were generated, nor if the parser supports the full spec (is there one?).

Perhaps @pkamenarsky knows more about this topic as he made changed related to fonts in HPDF?

[unhammer]

Did you ever figure this out? I also notice I don't get subscripts, e.g. with Times_Roman, the string "C₂₁H₃₀O₅" prints as CHO

[ciukstar]

Did you ever figure this out? I also notice I don't get subscripts, e.g. with Times_Roman, the string "C₂₁H₃₀O₅" prints as CHO

No. I couldn't figure out. I have tried many different .pfb and .afm files (CTAN) but it seems that it doesn't support uniXXXXX tokens in .afm files and when those tokens are missing in .afm files it returns error *** Exception: head: empty list

There is a TODO.txt file which says that "The MAIN missing feature is the support for unicode and the bidirectionnal layout algorithm that will then be required".
I guess, it is just not implemented.