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Add a fast path for shaping ASCII text

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This commit is contained in:
Matt Brubeck 2016-05-17 09:58:55 -07:00
parent 477258f11b
commit 5991afafa4
9 changed files with 218 additions and 25 deletions
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6
components/gfx/font.rs
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@ -30,6 +30,8 @@ macro_rules! ot_tag {
);
}
pub const GPOS: u32 = ot_tag!('G', 'P', 'O', 'S');
pub const GSUB: u32 = ot_tag!('G', 'S', 'U', 'B');
pub const KERN: u32 = ot_tag!('k', 'e', 'r', 'n');
static TEXT_SHAPING_PERFORMANCE_COUNTER: AtomicUsize = ATOMIC_USIZE_INIT;
@ -51,7 +53,9 @@ pub trait FontHandleMethods: Sized {
fn glyph_index(&self, codepoint: char) -> Option<GlyphId>;
fn glyph_h_advance(&self, GlyphId) -> Option<FractionalPixel>;
fn glyph_h_kerning(&self, GlyphId, GlyphId) -> FractionalPixel;
fn glyph_h_kerning(&self, glyph0: GlyphId, glyph1: GlyphId) -> FractionalPixel;
/// Can this font do basic horizontal LTR shaping without Harfbuzz?
fn can_do_fast_shaping(&self) -> bool;
fn metrics(&self) -> FontMetrics;
fn table_for_tag(&self, FontTableTag) -> Option<FontTable>;
}