rustybuzz/hb/ot/layout/GSUB/
ligature_subst.rs

1use crate::hb::ot_layout_gsubgpos::OT::hb_ot_apply_context_t;
2use crate::hb::ot_layout_gsubgpos::{Apply, WouldApply, WouldApplyContext};
3use ttf_parser::gsub::LigatureSubstitution;
4
5// LigatureSubstFormat1::would_apply
6impl WouldApply for LigatureSubstitution<'_> {
7    fn would_apply(&self, ctx: &WouldApplyContext) -> bool {
8        self.coverage
9            .get(ctx.glyphs[0])
10            .and_then(|index| self.ligature_sets.get(index))
11            .map_or(false, |set| set.would_apply(ctx))
12    }
13}
14
15// LigatureSubstFormat1::apply
16impl Apply for LigatureSubstitution<'_> {
17    fn apply(&self, ctx: &mut hb_ot_apply_context_t) -> Option<()> {
18        let glyph = ctx.buffer.cur(0).as_glyph();
19        self.coverage
20            .get(glyph)
21            .and_then(|index| self.ligature_sets.get(index))
22            .and_then(|set| set.apply(ctx))
23    }
24}