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OTF feature tags #74

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emilk opened this issue Feb 2, 2023 · 2 comments
Open

OTF feature tags #74

emilk opened this issue Feb 2, 2023 · 2 comments

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@emilk
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emilk commented Feb 2, 2023

OTF files have feature flags, like tnum.

It would be wonderful to be able to enable such flags in ab-glyph
@emilk emilk mentioned this issue Feb 2, 2023
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@alexheretic
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Yet it would be nice to have. The first step would be figuring out exactly how they work using ttf-parser crate.

@simoncozens
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You're going to need a shaping engine like harfbuzz_rs/rustybuzz/allsorts to execute the substitution and positioning rules in the GSUB/GPOS tables stored with each feature. It does get very complicated (particularly with lookup flags and especially with complex scripts), so I would advise against trying to implement shaping in this crate / with ttf-parser.

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@simoncozens @emilk @alexheretic