Fast API for loading, scaling, positioning and rasterizing OpenType font glyphs.
use ab_glyph::{FontRef, Font, Glyph, point};
let font = FontRef::try_from_slice(include_bytes!("../../dev/fonts/Exo2-Light.otf"))?;
// Get a glyph for 'q' with a scale & position.
let q_glyph: Glyph = font.glyph_id('q').with_scale_and_position(24.0, point(100.0, 0.0));
// Draw it.
if let Some(q) = font.outline_glyph(q_glyph) {
q.draw(|x, y, c| { /* draw pixel `(x, y)` with coverage: `c` */ });
}no_std environments are supported using alloc & libm.
ab_glyph = { default-features = false, features = ["libm"] }Comparison with rusttype
ab_glyph is a rewrite of rusttype made after I added .otf support for the latter and saw some performance issue's with the rusttype API.
ab_glyph is a more focussed API concentrating on high performance for both .ttf & .otf fonts.
When laying out glyphs into paragraph, ab_glyph is faster than rusttype using .ttf fonts & much faster for .otf fonts.
group ab-glyph rusttype 0.9
----- -------- ------------
layout_a_sentence (exo2-ttf) 1.00 11.1±0.08µs 1.56 17.3±0.14µs
layout_a_sentence (exo2-otf) 1.00 11.1±0.12µs 8.85 98.1±1.17µs
Note: Numbers from May-2020 benchmarks, ab-glyph performance is also expected to have improved since then.