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Re: Problem with OTF support

From: Masamichi Hosoda
Subject: Re: Problem with OTF support
Date: Tue, 20 Oct 2020 12:56:30 +0900 (JST)

> [lilypond dcd531b0f, gs 9.52]
> Processing the following sample code
>   \paper {
>     #(define fonts
>       (set-global-fonts
>        #:roman "Source Han Serif TW"
>        #:sans "sans-serif"
>        #:typewriter "monospace"
>      ))
>   }
>   \markup { "ろ" }   % This is character U+308D.
> causes the attached image, which is obviously wrong (inspite of the
> name, the 'TW' variant of the 'Source Han Serif' family contains
> Hiragana syllables).  Running `pdffonts` on the output PDF
> demonstrates that the right font gets used:
>   UOIEOY+SourceHanSerifTW-Regular  CID Type 0C  Identity-H  yes yes no   9  0
> Looking into the `--eps` output of LilyPond I see the following:
>   /SourceHanSerifTW-Regular /CIDFont findresource [...]
>   2.1852 0.0000 0.0000 1277
>   1 print_glyphs
> The main question is where the value 1277 comes from.
> In the (OTF) font's `cmap` table, U+308D maps to glyph 'cid01536',
> which has index 1277 in the font.
> However, the glyph shown in the image is U+2609, glyph 'cid01277'.
> index 1021.
> If I extract the (raw) CFF file from the EPS file, glyph index 1277 is
> U+2609 (so CID numbers are one-to-one mapped to glyph indices, as
> indicated by the 'Identity-H' entry above).  The correct value should
> be – as can be guessed now – 1536.
> In other words, CID values (this is, glyph indices in the raw CFF
> font) and OpenType glyph indices are mixed up.  Masamichi-san, do you
> have a quick fix for this?

If I understand correctly,
"Source Han Serif TW" is one of "Region-specific Subset OTFs".
They are subset fonts, so CID != GID.

"Language-specific OTFs" (e.g. "Source Han Serif TC") are not subset fonts,
so CID==GID.
I think these non-subset fonts would be fine.

Of course, if you use Hiragana,
it's better to use "Source Han Serif" (for Japanese)
instead of "Source Han Serif TC" (for Traditional Chinese).

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