kc3-lang/harfbuzz

2020-12-09T10:44:18

[subset] optimize glyph closure method: step1 Previous GSUB glyph closure is done by recursively visiting all reachable lookup tables that apply to any glyphs in the current/input glyph set, but actually only the glyphs that the parent lookup can apply the recursion to can participate in recursing the lookup. This is step 1 for glyph closure optimization: 1. Add stack of currently active glyph set pointers into hb_closure_context_t 2. Update closure() method in simple GSUB tables to use this stack in order not to change current glyph set at different stages of recursion 3. Add function may_have_non_1to1() to GSUB tables