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Add function for getting swash image without caching

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This commit is contained in:
Jeremy Soller 2022-10-25 19:40:17 -06:00
parent 22036a0f9e
commit f652dd1a99
1 changed files with 45 additions and 36 deletions
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81
src/swash.rs
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@ -9,6 +9,44 @@ use crate::{CacheKey, FontMatches};
pub use swash::scale::image::Image as SwashImage;
fn swash_image(context: &mut ScaleContext, matches: &FontMatches, cache_key: CacheKey) -> Option<SwashImage> {
let font = match matches.get_font(&cache_key.font_id) {
Some(some) => some,
None => {
log::warn!("did not find font {:?}", cache_key.font_id);
return None;
},
};
// Build the scaler
let mut scaler = context
.builder(font.as_swash())
.size(cache_key.font_size as f32)
.hint(true)
.build();
// Compute the fractional offset-- you'll likely want to quantize this
// in a real renderer
let offset =
Vector::new(cache_key.x_bin.as_float(), cache_key.y_bin.as_float());
// Select our source order
Render::new(&[
// Color outline with the first palette
Source::ColorOutline(0),
// Color bitmap with best fit selection mode
Source::ColorBitmap(StrikeWith::BestFit),
// Standard scalable outline
Source::Outline,
])
// Select a subpixel format
.format(Format::Alpha)
// Apply the fractional offset
.offset(offset)
// Render the image
.render(&mut scaler, cache_key.glyph_id)
}
pub struct SwashCache {
context: ScaleContext,
pub image_cache: HashMap<CacheKey, Option<SwashImage>>,
@ -23,44 +61,15 @@ impl SwashCache {
}
}
/// Create a swash Image from a cache key, without caching results
pub fn get_image_uncached(&mut self, matches: &FontMatches, cache_key: CacheKey) -> Option<SwashImage> {
swash_image(&mut self.context, matches, cache_key)
}
/// Create a swash Image from a cache key, caching results
pub fn get_image(&mut self, matches: &FontMatches<'_>, cache_key: CacheKey) -> &Option<SwashImage> {
pub fn get_image(&mut self, matches: &FontMatches, cache_key: CacheKey) -> &Option<SwashImage> {
self.image_cache.entry(cache_key).or_insert_with(|| {
let font = match matches.get_font(&cache_key.font_id) {
Some(some) => some,
None => {
log::warn!("did not find font {:?}", cache_key.font_id);
return None;
},
};
// Build the scaler
let mut scaler = self.context
.builder(font.as_swash())
.size(cache_key.font_size as f32)
.hint(true)
.build();
// Compute the fractional offset-- you'll likely want to quantize this
// in a real renderer
let offset =
Vector::new(cache_key.x_bin.as_float(), cache_key.y_bin.as_float());
// Select our source order
Render::new(&[
// Color outline with the first palette
Source::ColorOutline(0),
// Color bitmap with best fit selection mode
Source::ColorBitmap(StrikeWith::BestFit),
// Standard scalable outline
Source::Outline,
])
// Select a subpixel format
.format(Format::Alpha)
// Apply the fractional offset
.offset(offset)
// Render the image
.render(&mut scaler, cache_key.glyph_id)
swash_image(&mut self.context, matches, cache_key)
})
}