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Add set and lookup glyph collection to C API - #501
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Expose hr_set and GSUB/GPOS presence and lookup count queries. Collect glyph roles from direct and contextual lookup subtables, including nested GSUB substitutions, using read-fonts without temporary sets. Add focused C API regression tests and an optional differential harness. Compared 79 lookups across five fonts with HarfBuzz and found no set differences; all 115 C API tests and Clippy pass.
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Nice. Maybe ask assistant to fully map set / map etc APIs. |
behdad
self-requested a review
October 5, 2026 21:42
behdad
approved these changes
Oct 5, 2026
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Filed #504 to track extending the API |
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Expose hr_set and GSUB/GPOS presence and lookup count queries. Collect glyph roles from direct and contextual lookup subtables, including nested GSUB substitutions, using read-fonts without temporary sets.
Add focused C API regression tests and an optional differential harness. Compared 79 lookups across five fonts with HarfBuzz and found no set differences; all 115 C API tests and Clippy pass.