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Add font variations example and cache bug in variations api

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This commit is contained in:
lucasmerlin
2026-03-26 11:29:00 +01:00
parent 1c9f74b8bd
commit cb3b146067
7 changed files with 206 additions and 41 deletions
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71
crates/epaint/src/text/font.rs
View File

@@ -149,7 +149,11 @@ impl GlyphCacheKey {
let StyledMetrics {
pixels_per_point,
px_scale_factor,
..
ref location,
scale: _,
y_offset_in_points: _,
ascent: _,
row_height: _,
} = *metrics;
debug_assert!(
0.0 < pixels_per_point && pixels_per_point.is_finite(),
@@ -164,6 +168,7 @@ impl GlyphCacheKey {
pixels_per_point.to_bits(),
px_scale_factor.to_bits(),
bin,
location,
)))
}
}
@@ -175,7 +180,6 @@ struct DependentFontData<'a> {
charmap: skrifa::charmap::Charmap<'a>,
outline_glyphs: skrifa::outline::OutlineGlyphCollection<'a>,
metrics: skrifa::metrics::Metrics,
glyph_metrics: skrifa::metrics::GlyphMetrics<'a>,
hinting_instance: Option<skrifa::outline::HintingInstance>,
}
@@ -220,7 +224,9 @@ impl FontCell {
if let Some(hinting_instance) = &mut font_data.hinting_instance {
let size = skrifa::instance::Size::new(metrics.scale);
if hinting_instance.size() != size {
if hinting_instance.size() != size
|| hinting_instance.location().coords() != location.coords()
{
hinting_instance
.reconfigure(
&font_data.outline_glyphs,
@@ -337,7 +343,7 @@ pub struct FontFace {
font: FontCell,
tweak: FontTweak,
glyph_info_cache: ahash::HashMap<char, GlyphInfo>,
glyph_info_cache: ahash::HashMap<(char, skrifa::instance::Location), GlyphInfo>,
glyph_alloc_cache: ahash::HashMap<GlyphCacheKey, GlyphAllocation>,
}
@@ -363,11 +369,6 @@ impl FontFace {
skrifa::instance::Size::unscaled(),
skrifa::instance::LocationRef::default(),
);
let glyph_metrics = skrifa_font.glyph_metrics(
skrifa::instance::Size::unscaled(),
skrifa::instance::LocationRef::default(),
);
let hinting_enabled = tweak.hinting_override.unwrap_or(options.font_hinting);
let hinting_instance = hinting_enabled
.then(|| {
@@ -388,7 +389,6 @@ impl FontFace {
charmap,
outline_glyphs: glyphs,
metrics,
glyph_metrics,
hinting_instance,
})
})?;
@@ -432,8 +432,13 @@ impl FontFace {
}
/// `\n` will result in `None`
pub(super) fn glyph_info(&mut self, c: char) -> Option<GlyphInfo> {
if let Some(glyph_info) = self.glyph_info_cache.get(&c) {
pub(super) fn glyph_info(
&mut self,
c: char,
location: &skrifa::instance::Location,
) -> Option<GlyphInfo> {
let cache_key = (c, location.clone());
if let Some(glyph_info) = self.glyph_info_cache.get(&cache_key) {
return Some(*glyph_info);
}
@@ -442,7 +447,7 @@ impl FontFace {
}
if c == '\t'
&& let Some(space) = self.glyph_info(' ')
&& let Some(space) = self.glyph_info(' ', location)
{
let glyph_info = GlyphInfo {
advance_width_unscaled: (crate::text::TAB_SIZE as f32
@@ -450,7 +455,7 @@ impl FontFace {
.into(),
..space
};
self.glyph_info_cache.insert(c, glyph_info);
self.glyph_info_cache.insert(cache_key, glyph_info);
return Some(glyph_info);
}
@@ -459,21 +464,21 @@ impl FontFace {
// https://www.compart.com/en/unicode/U+2009
// https://en.wikipedia.org/wiki/Thin_space
if let Some(space) = self.glyph_info(' ') {
if let Some(space) = self.glyph_info(' ', location) {
let em = self.font.borrow_dependent().metrics.units_per_em as f32;
let advance_width = f32::min(em / 6.0, space.advance_width_unscaled.0 * 0.5); // TODO(emilk): make configurable
let glyph_info = GlyphInfo {
advance_width_unscaled: advance_width.into(),
..space
};
self.glyph_info_cache.insert(c, glyph_info);
self.glyph_info_cache.insert(cache_key, glyph_info);
return Some(glyph_info);
}
}
if invisible_char(c) {
let glyph_info = GlyphInfo::INVISIBLE;
self.glyph_info_cache.insert(c, glyph_info);
self.glyph_info_cache.insert(cache_key, glyph_info);
return Some(glyph_info);
}
@@ -485,15 +490,17 @@ impl FontFace {
.map(c)
.filter(|id| *id != skrifa::GlyphId::NOTDEF)?;
let glyph_metrics = font_data
.skrifa
.glyph_metrics(skrifa::instance::Size::unscaled(), location);
let glyph_info = GlyphInfo {
id: Some(glyph_id),
advance_width_unscaled: font_data
.glyph_metrics
advance_width_unscaled: glyph_metrics
.advance_width(glyph_id)
.unwrap_or_default()
.into(),
};
self.glyph_info_cache.insert(c, glyph_info);
self.glyph_info_cache.insert(cache_key, glyph_info);
Some(glyph_info)
}
@@ -626,8 +633,9 @@ pub struct Font<'a> {
impl Font<'_> {
pub fn preload_characters(&mut self, s: &str) {
let default_location = skrifa::instance::Location::default();
for c in s.chars() {
self.glyph_info(c);
self.glyph_info(c, &default_location);
}
}
@@ -661,7 +669,8 @@ impl Font<'_> {
/// Width of this character in points.
pub fn glyph_width(&mut self, c: char, font_size: f32) -> f32 {
let (key, glyph_info) = self.glyph_info(c);
let default_location = skrifa::instance::Location::default();
let (key, glyph_info) = self.glyph_info(c, &default_location);
if let Some(font) = &self.fonts_by_id.get(&key) {
glyph_info.advance_width_unscaled.0 * font.font.px_scale_factor(font_size)
} else {
@@ -671,7 +680,8 @@ impl Font<'_> {
/// Can we display this glyph?
pub fn has_glyph(&mut self, c: char) -> bool {
self.glyph_info(c) != self.cached_family.replacement_glyph // TODO(emilk): this is a false negative if the user asks about the replacement character itself 🤦‍♂️
let default_location = skrifa::instance::Location::default();
self.glyph_info(c, &default_location) != self.cached_family.replacement_glyph // TODO(emilk): this is a false negative if the user asks about the replacement character itself 🤦‍♂️
}
/// Can we display all the glyphs in this text?
@@ -680,19 +690,26 @@ impl Font<'_> {
}
/// `\n` will (intentionally) show up as the replacement character.
pub(crate) fn glyph_info(&mut self, c: char) -> (FontFaceKey, GlyphInfo) {
if let Some(font_index_glyph_info) = self.cached_family.glyph_info_cache.get(&c) {
pub(crate) fn glyph_info(
&mut self,
c: char,
location: &skrifa::instance::Location,
) -> (FontFaceKey, GlyphInfo) {
let cache_key = (c, location.clone());
if let Some(font_index_glyph_info) =
self.cached_family.glyph_info_cache.get(&cache_key)
{
return *font_index_glyph_info;
}
let font_index_glyph_info = self
.cached_family
.glyph_info_no_cache_or_fallback(c, self.fonts_by_id);
.glyph_info_no_cache_or_fallback(c, location, self.fonts_by_id);
let font_index_glyph_info =
font_index_glyph_info.unwrap_or(self.cached_family.replacement_glyph);
self.cached_family
.glyph_info_cache
.insert(c, font_index_glyph_info);
.insert(cache_key, font_index_glyph_info);
font_index_glyph_info
}
}

14
crates/epaint/src/text/fonts.rs
View File

@@ -438,7 +438,8 @@ pub(super) struct CachedFamily {
pub replacement_glyph: (FontFaceKey, GlyphInfo),
pub glyph_info_cache: ahash::HashMap<char, (FontFaceKey, GlyphInfo)>,
pub glyph_info_cache:
ahash::HashMap<(char, skrifa::instance::Location), (FontFaceKey, GlyphInfo)>,
}
impl CachedFamily {
@@ -465,9 +466,10 @@ impl CachedFamily {
const PRIMARY_REPLACEMENT_CHAR: char = '◻'; // white medium square
const FALLBACK_REPLACEMENT_CHAR: char = '?'; // fallback for the fallback
let default_location = skrifa::instance::Location::default();
let replacement_glyph = slf
.glyph_info_no_cache_or_fallback(PRIMARY_REPLACEMENT_CHAR, fonts_by_id)
.or_else(|| slf.glyph_info_no_cache_or_fallback(FALLBACK_REPLACEMENT_CHAR, fonts_by_id))
.glyph_info_no_cache_or_fallback(PRIMARY_REPLACEMENT_CHAR, &default_location, fonts_by_id)
.or_else(|| slf.glyph_info_no_cache_or_fallback(FALLBACK_REPLACEMENT_CHAR, &default_location, fonts_by_id))
.unwrap_or_else(|| {
log::warn!(
"Failed to find replacement characters {PRIMARY_REPLACEMENT_CHAR:?} or {FALLBACK_REPLACEMENT_CHAR:?}. Will use empty glyph."
@@ -482,12 +484,14 @@ impl CachedFamily {
pub(crate) fn glyph_info_no_cache_or_fallback(
&mut self,
c: char,
location: &skrifa::instance::Location,
fonts_by_id: &mut nohash_hasher::IntMap<FontFaceKey, FontFace>,
) -> Option<(FontFaceKey, GlyphInfo)> {
for font_key in &self.fonts {
let font_face = fonts_by_id.get_mut(font_key).expect("Nonexistent font ID");
if let Some(glyph_info) = font_face.glyph_info(c) {
self.glyph_info_cache.insert(c, (*font_key, glyph_info));
if let Some(glyph_info) = font_face.glyph_info(c, location) {
self.glyph_info_cache
.insert((c, location.clone()), (*font_key, glyph_info));
return Some((*font_key, glyph_info));
}
}

15
crates/epaint/src/text/text_layout.rs
View File

@@ -186,7 +186,7 @@ fn layout_section(
paragraph = out_paragraphs.last_mut().unwrap();
paragraph.empty_paragraph_height = line_height; // TODO(emilk): replace this hack with actually including `\n` in the glyphs?
} else {
let (font_id, glyph_info) = font.glyph_info(chr);
let (font_id, glyph_info) = font.glyph_info(chr, &font_metrics.location);
let mut font_face = font.fonts_by_id.get_mut(&font_id);
if current_font != font_id {
current_font = font_id;
@@ -471,12 +471,9 @@ fn replace_last_glyph_with_overflow_character(
let mut font = fonts.font(&section.format.font_id.family);
let font_size = section.format.font_id.size;
let (font_id, glyph_info) = font.glyph_info(overflow_character);
let font_face_metrics = font.styled_metrics(pixels_per_point, font_size, &section.format.coords);
let (font_id, glyph_info) = font.glyph_info(overflow_character, &font_face_metrics.location);
let mut font_face = font.fonts_by_id.get_mut(&font_id);
let font_face_metrics = font_face
.as_mut()
.map(|f| f.styled_metrics(pixels_per_point, font_size, &section.format.coords))
.unwrap_or_default();
let overflow_glyph_x = if let Some(prev_glyph) = row.glyphs.last() {
// Kern the overflow character properly
@@ -484,8 +481,8 @@ fn replace_last_glyph_with_overflow_character(
.as_mut()
.map(|font_face| {
if let (Some(prev_glyph_id), Some(overflow_glyph_id)) = (
font_face.glyph_info(prev_glyph.chr).and_then(|g| g.id),
font_face.glyph_info(overflow_character).and_then(|g| g.id),
font_face.glyph_info(prev_glyph.chr, &font_face_metrics.location).and_then(|g| g.id),
font_face.glyph_info(overflow_character, &font_face_metrics.location).and_then(|g| g.id),
) {
font_face.pair_kerning(&font_face_metrics, prev_glyph_id, overflow_glyph_id)
} else {
@@ -501,7 +498,7 @@ fn replace_last_glyph_with_overflow_character(
let replacement_glyph_width = font_face
.as_mut()
.and_then(|f| f.glyph_info(overflow_character))
.and_then(|f| f.glyph_info(overflow_character, &font_face_metrics.location))
.map(|i| {
i.advance_width_unscaled.0 * font_face_metrics.px_scale_factor / pixels_per_point
})