[HarfBuzz] Font-independent shaping

[Ken Schutte]

Is it possible to do "shaping" (not sure if that's the correct term here)
without given a font?

I realize different fonts will support different features, but I want to
input a unicode string and get information like,

- this 'ARABIC LETTER BEH' should use 'ARABIC LETTER BEH INITIAL FORM'
- this 'ARABIC SHADDA' will be combined with previous character
- mandatory ligatures (lam+alif)
etc
(of course will not get glyph coordinates)

Can I use harfbuzz for this or does it always require a font?

Thanks,
Ken
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