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This commit is contained in:
Stewart Connor 2025-03-26 17:43:13 +11:00
parent 71b0680e6f
commit dc03df8986
1 changed files with 10 additions and 5 deletions
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15
src/attrs.rs
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@ -124,28 +124,33 @@ impl From<CacheMetrics> for Metrics {
} }
} }
} }
/// A 4-byte OpenType feature tag identifier
/// OpenType feature tag
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)] #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub struct FeatureTag([u8; 4]); pub struct FeatureTag([u8; 4]);
impl FeatureTag { impl FeatureTag {
/// Create a new feature tag from a 4-character string
pub const fn new(tag: &[u8; 4]) -> Self { pub const fn new(tag: &[u8; 4]) -> Self {
Self(*tag) Self(*tag)
} }
// Common OpenType features as constants /// Kerning adjusts spacing between specific character pairs
pub const KERNING: Self = Self::new(b"kern"); pub const KERNING: Self = Self::new(b"kern");
/// Standard ligatures (fi, fl, etc.)
pub const STANDARD_LIGATURES: Self = Self::new(b"liga"); pub const STANDARD_LIGATURES: Self = Self::new(b"liga");
/// Contextual ligatures (context-dependent ligatures)
pub const CONTEXTUAL_LIGATURES: Self = Self::new(b"clig"); pub const CONTEXTUAL_LIGATURES: Self = Self::new(b"clig");
/// Contextual alternates (glyph substitutions based on context)
pub const CONTEXTUAL_ALTERNATES: Self = Self::new(b"calt"); pub const CONTEXTUAL_ALTERNATES: Self = Self::new(b"calt");
/// Discretionary ligatures (optional stylistic ligatures)
pub const DISCRETIONARY_LIGATURES: Self = Self::new(b"dlig"); pub const DISCRETIONARY_LIGATURES: Self = Self::new(b"dlig");
/// Small caps (lowercase to small capitals)
pub const SMALL_CAPS: Self = Self::new(b"smcp"); pub const SMALL_CAPS: Self = Self::new(b"smcp");
/// All small caps (uppercase and lowercase to small capitals)
pub const ALL_SMALL_CAPS: Self = Self::new(b"c2sc"); pub const ALL_SMALL_CAPS: Self = Self::new(b"c2sc");
/// Stylistic Set 1 (font-specific alternate glyphs)
pub const STYLISTIC_SET_1: Self = Self::new(b"ss01"); pub const STYLISTIC_SET_1: Self = Self::new(b"ss01");
/// Stylistic Set 2 (font-specific alternate glyphs)
pub const STYLISTIC_SET_2: Self = Self::new(b"ss02"); pub const STYLISTIC_SET_2: Self = Self::new(b"ss02");
// Add more common features as needed
pub fn as_bytes(&self) -> &[u8; 4] { pub fn as_bytes(&self) -> &[u8; 4] {
&self.0 &self.0