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harfbuzz / harfbuzzjs

Providing HarfBuzz shaping library for client/server side JavaScript projects
https://harfbuzz.github.io/harfbuzzjs/
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wip: retain glyphs reachable from the icon glyphs #94

Closed yisibl closed 1 year ago

yisibl commented 1 year ago

We have a python script that handles subsetting these fonts here: https://github.com/rsheeter/subset-gf-icons/blob/main/src/subset_gf_icons/subset_gf_icons.py

Your description of what you need to do is pretty much the same, but the missing step is that you need to get the glyph closure from only the icon glyphs and not the a-z glyphs (seen here: https://github.com/rsheeter/subset-gf-icons/blob/main/src/subset_gf_icons/subset_gf_icons.py#L106). This can be done in harfbuzz by generating a subset plan and then extracting the set of included glyphs from it (via: hb_subset_plan_create_or_fail and hb_subset_plan_old_to_new_glyph_mapping)

The result of that closure would then be used to form the final subset in combination with the a-z gids and no layout closure.