diff options
Diffstat (limited to 'tiny_skia/src')
| -rw-r--r-- | tiny_skia/src/text.rs | 102 |
1 files changed, 64 insertions, 38 deletions
diff --git a/tiny_skia/src/text.rs b/tiny_skia/src/text.rs index 4f89ef52..22c17507 100644 --- a/tiny_skia/src/text.rs +++ b/tiny_skia/src/text.rs @@ -66,17 +66,10 @@ impl Pipeline { shaping, }; - let (_, buffer) = self.cache.get_mut().allocate(font_system, key); + let (_, entry) = self.cache.get_mut().allocate(font_system, key); - let (total_lines, max_width) = buffer - .layout_runs() - .enumerate() - .fold((0, 0.0), |(_, max), (i, buffer)| { - (i + 1, buffer.line_w.max(max)) - }); - - let total_height = total_lines as f32 * line_height * scale_factor; - let max_width = max_width * scale_factor; + let max_width = entry.bounds.width * scale_factor; + let total_height = entry.bounds.height * scale_factor; let bounds = bounds * scale_factor; @@ -94,7 +87,7 @@ impl Pipeline { let mut swash = cosmic_text::SwashCache::new(); - for run in buffer.layout_runs() { + for run in entry.buffer.layout_runs() { for glyph in run.glyphs { let physical_glyph = glyph.physical((x, y), scale_factor); @@ -143,7 +136,7 @@ impl Pipeline { let line_height = f32::from(line_height.to_absolute(Pixels(size))); - let (_, paragraph) = measurement_cache.allocate( + let (_, entry) = measurement_cache.allocate( &mut self.font_system.borrow_mut(), Key { content, @@ -155,14 +148,7 @@ impl Pipeline { }, ); - let (total_lines, max_width) = paragraph - .layout_runs() - .enumerate() - .fold((0, 0.0), |(_, max), (i, buffer)| { - (i + 1, buffer.line_w.max(max)) - }); - - Size::new(max_width, line_height * total_lines as f32) + entry.bounds } pub fn hit_test( @@ -180,7 +166,7 @@ impl Pipeline { let line_height = f32::from(line_height.to_absolute(Pixels(size))); - let (_, paragraph) = measurement_cache.allocate( + let (_, entry) = measurement_cache.allocate( &mut self.font_system.borrow_mut(), Key { content, @@ -192,12 +178,22 @@ impl Pipeline { }, ); - let cursor = paragraph.hit(point.x, point.y)?; + let cursor = entry.buffer.hit(point.x, point.y)?; Some(Hit::CharOffset(cursor.index)) } } +fn measure(buffer: &cosmic_text::Buffer) -> Size { + let (width, total_lines) = buffer + .layout_runs() + .fold((0.0, 0usize), |(width, total_lines), run| { + (run.line_w.max(width), total_lines + 1) + }); + + Size::new(width, total_lines as f32 * buffer.metrics().line_height) +} + fn to_family(family: font::Family) -> cosmic_text::Family<'static> { match family { font::Family::Name(name) => cosmic_text::Family::Name(name), @@ -354,12 +350,18 @@ impl GlyphCache { } struct Cache { - entries: FxHashMap<KeyHash, cosmic_text::Buffer>, + entries: FxHashMap<KeyHash, Entry>, + measurements: FxHashMap<KeyHash, KeyHash>, recently_used: FxHashSet<KeyHash>, hasher: HashBuilder, trim_count: usize, } +struct Entry { + buffer: cosmic_text::Buffer, + bounds: Size, +} + #[cfg(not(target_arch = "wasm32"))] type HashBuilder = twox_hash::RandomXxHashBuilder64; @@ -372,6 +374,7 @@ impl Cache { fn new() -> Self { Self { entries: FxHashMap::default(), + measurements: FxHashMap::default(), recently_used: FxHashSet::default(), hasher: HashBuilder::default(), trim_count: 0, @@ -382,20 +385,18 @@ impl Cache { &mut self, font_system: &mut cosmic_text::FontSystem, key: Key<'_>, - ) -> (KeyHash, &mut cosmic_text::Buffer) { - let hash = { - let mut hasher = self.hasher.build_hasher(); - - key.content.hash(&mut hasher); - key.size.to_bits().hash(&mut hasher); - key.line_height.to_bits().hash(&mut hasher); - key.font.hash(&mut hasher); - key.bounds.width.to_bits().hash(&mut hasher); - key.bounds.height.to_bits().hash(&mut hasher); - key.shaping.hash(&mut hasher); - - hasher.finish() - }; + ) -> (KeyHash, &mut Entry) { + let hash = key.hash(self.hasher.build_hasher()); + + if let Some(measured_hash) = self.measurements.get(&hash) { + let _ = self.recently_used.insert(hash); + let _ = self.recently_used.insert(*measured_hash); + + return ( + *measured_hash, + self.entries.get_mut(&measured_hash).unwrap(), + ); + } if let hash_map::Entry::Vacant(entry) = self.entries.entry(hash) { let metrics = cosmic_text::Metrics::new(key.size, key.size * 1.2); @@ -416,7 +417,16 @@ impl Cache { to_shaping(key.shaping), ); - let _ = entry.insert(buffer); + let bounds = measure(&buffer); + + let _ = entry.insert(Entry { buffer, bounds }); + + if key.bounds != bounds { + let _ = self.measurements.insert( + Key { bounds, ..key }.hash(self.hasher.build_hasher()), + hash, + ); + } } let _ = self.recently_used.insert(hash); @@ -428,6 +438,8 @@ impl Cache { if self.trim_count > Self::TRIM_INTERVAL { self.entries .retain(|key, _| self.recently_used.contains(key)); + self.measurements + .retain(|key, _| self.recently_used.contains(key)); self.recently_used.clear(); @@ -448,4 +460,18 @@ struct Key<'a> { shaping: Shaping, } +impl Key<'_> { + fn hash<H: Hasher>(self, mut hasher: H) -> KeyHash { + self.content.hash(&mut hasher); + self.size.to_bits().hash(&mut hasher); + self.line_height.to_bits().hash(&mut hasher); + self.font.hash(&mut hasher); + self.bounds.width.to_bits().hash(&mut hasher); + self.bounds.height.to_bits().hash(&mut hasher); + self.shaping.hash(&mut hasher); + + hasher.finish() + } +} + type KeyHash = u64; |