leyoda/cosmic-text
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add contextual alternatives

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This commit is contained in:
Stewart Connor 2025-03-21 18:24:32 +11:00
parent 50373cd6d7
commit f5879b3425
2 changed files with 8 additions and 0 deletions
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3
src/attrs.rs
View file

@ -134,6 +134,8 @@ pub struct FontFeatures {
pub standard_ligatures: bool,
/// Contextual ligatures (context-dependent ligatures)
pub contextual_ligatures: bool,
/// Contextual alternates (glyph substitutions based on context)
pub contextual_alternates: bool,
/// Discretionary ligatures (optional stylistic ligatures)
pub discretionary_ligatures: bool,
}
@ -145,6 +147,7 @@ impl FontFeatures {
kerning: true,
standard_ligatures: true,
contextual_ligatures: true,
contextual_alternates: true,
discretionary_ligatures: true,
}
}

5
src/shape.rs
View file

@ -158,6 +158,11 @@ fn shape_fallback(
attrs.font_features.contextual_ligatures as u32,
0..usize::MAX,
));
features.push(rustybuzz::Feature::new(
rustybuzz::ttf_parser::Tag::from_bytes(b"calt"),
attrs.font_features.contextual_alternates as u32,
0..usize::MAX,
));
features.push(rustybuzz::Feature::new(
rustybuzz::ttf_parser::Tag::from_bytes(b"dlig"),
attrs.font_features.discretionary_ligatures as u32,