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Add capability to synthesize italic

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This commit is contained in:
Jeremy Soller 2024-01-02 11:36:53 -07:00
parent 46d60a3723
commit bd5f2f95e8
7 changed files with 55 additions and 7 deletions
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12
src/swash.rs
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@ -7,10 +7,10 @@ use swash::scale::{image::Content, ScaleContext};
use swash::scale::{Render, Source, StrikeWith};
use swash::zeno::{Format, Vector};
use crate::{CacheKey, Color, FontSystem, HashMap};
use crate::{CacheKey, CacheKeyFlags, Color, FontSystem, HashMap};
pub use swash::scale::image::{Content as SwashContent, Image as SwashImage};
pub use swash::zeno::{Command, Placement};
pub use swash::zeno::{Angle, Command, Placement, Transform};
fn swash_image(
font_system: &mut FontSystem,
@ -49,6 +49,14 @@ fn swash_image(
.format(Format::Alpha)
// Apply the fractional offset
.offset(offset)
.transform(if cache_key.flags.contains(CacheKeyFlags::FAKE_ITALIC) {
Some(Transform::skew(
Angle::from_degrees(14.0),
Angle::from_degrees(0.0),
))
} else {
None
})
// Render the image
.render(&mut scaler, cache_key.glyph_id)
}