[fea-rs] Simplify singlesub format selection

googlefonts / fontc

Where in we pursue oxidizing (context: https://github.com/googlefonts/oxidize) fontmake.

Apache License 2.0

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[fea-rs] Simplify singlesub format selection #1013

Closed cmyr closed 1 month ago

cmyr commented 1 month ago

This matches the behaviour of fonttools; we not attempt to optimize size by splitting glyphs into format1 subtables, and will only use format1 if all the glyphs in a builder share a delta.