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https://github.com/servo/servo.git
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4907e89656
Do font selection using Servo's font backend, which is shared with the rest of layout. In addition, delay the creation of the `font-kit` font until just before rendering with `raqote`. The idea is that when `raqote` is no longer used, we can drop the `font-kit` dependency. This change has the side-effect of fixing text rendering in canvas, adding support for font fallback in canvas, and also correcting a bug in font selection with size overrides. Signed-off-by: Martin Robinson <mrobinson@igalia.com> Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>
795 lines
28 KiB
Rust
795 lines
28 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use std::collections::{HashMap, HashSet};
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use std::default::Default;
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use std::hash::{BuildHasherDefault, Hash, Hasher};
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::Arc;
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use app_units::Au;
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use crossbeam_channel::unbounded;
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use fnv::FnvHasher;
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use fonts_traits::WebFontLoadFinishedCallback;
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use log::{debug, trace};
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use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
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use malloc_size_of_derive::MallocSizeOf;
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use net_traits::request::{Destination, Referrer, RequestBuilder};
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use net_traits::{fetch_async, CoreResourceThread, FetchResponseMsg, ResourceThreads};
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use parking_lot::{Mutex, ReentrantMutex, RwLock};
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use servo_arc::Arc as ServoArc;
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use style::computed_values::font_variant_caps::T as FontVariantCaps;
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use style::font_face::{FontFaceSourceFormat, FontFaceSourceFormatKeyword, Source, UrlSource};
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use style::media_queries::Device;
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use style::properties::style_structs::Font as FontStyleStruct;
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use style::shared_lock::SharedRwLockReadGuard;
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use style::stylesheets::{CssRule, DocumentStyleSheet, FontFaceRule, StylesheetInDocument};
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use style::values::computed::font::{FamilyName, FontFamilyNameSyntax, SingleFontFamily};
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use style::Atom;
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use url::Url;
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use webrender_api::{FontInstanceKey, FontKey};
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use crate::font::{
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Font, FontDescriptor, FontFamilyDescriptor, FontGroup, FontRef, FontSearchScope,
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};
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use crate::font_cache_thread::{CSSFontFaceDescriptors, FontIdentifier, FontSource};
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use crate::font_store::{CrossThreadFontStore, CrossThreadWebRenderFontStore};
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use crate::font_template::{FontTemplate, FontTemplateRef, FontTemplateRefMethods};
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use crate::LowercaseFontFamilyName;
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static SMALL_CAPS_SCALE_FACTOR: f32 = 0.8; // Matches FireFox (see gfxFont.h)
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/// The FontContext represents the per-thread/thread state necessary for
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/// working with fonts. It is the public API used by the layout and
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/// paint code. It talks directly to the font cache thread where
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/// required.
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pub struct FontContext<S: FontSource> {
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font_source: ReentrantMutex<S>,
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resource_threads: ReentrantMutex<CoreResourceThread>,
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cache: CachingFontSource<S>,
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web_fonts: CrossThreadFontStore,
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webrender_font_store: CrossThreadWebRenderFontStore,
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have_removed_web_fonts: AtomicBool,
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}
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impl<S: FontSource> MallocSizeOf for FontContext<S> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.cache.size_of(ops)
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}
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}
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impl<S: FontSource> FontContext<S> {
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pub fn new(font_source: S, resource_threads: ResourceThreads) -> FontContext<S> {
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#[allow(clippy::default_constructed_unit_structs)]
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FontContext {
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font_source: ReentrantMutex::new(font_source.clone()),
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resource_threads: ReentrantMutex::new(resource_threads.core_thread),
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cache: CachingFontSource::new(font_source),
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web_fonts: Arc::new(RwLock::default()),
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webrender_font_store: Arc::new(RwLock::default()),
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have_removed_web_fonts: AtomicBool::new(false),
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}
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}
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pub fn web_fonts_still_loading(&self) -> usize {
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self.web_fonts.read().number_of_fonts_still_loading()
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}
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/// Handle the situation where a web font finishes loading, specifying if the load suceeded or failed.
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fn handle_web_font_load_finished(
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&self,
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finished_callback: &WebFontLoadFinishedCallback,
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succeeded: bool,
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) {
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if succeeded {
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self.cache.invalidate_after_web_font_load();
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}
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finished_callback(succeeded);
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}
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/// Returns a `FontGroup` representing fonts which can be used for layout, given the `style`.
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/// Font groups are cached, so subsequent calls with the same `style` will return a reference
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/// to an existing `FontGroup`.
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pub fn font_group(&self, style: ServoArc<FontStyleStruct>) -> Arc<RwLock<FontGroup>> {
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let font_size = style.font_size.computed_size().into();
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self.font_group_with_size(style, font_size)
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}
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/// Like [`Self::font_group`], but overriding the size found in the [`FontStyleStruct`] with the given size
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/// in pixels.
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pub fn font_group_with_size(
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&self,
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style: ServoArc<FontStyleStruct>,
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size: Au,
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) -> Arc<RwLock<FontGroup>> {
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self.cache.font_group_with_size(style, size)
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}
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/// Returns a font matching the parameters. Fonts are cached, so repeated calls will return a
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/// reference to the same underlying `Font`.
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pub fn font(
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&self,
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font_template: FontTemplateRef,
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font_descriptor: &FontDescriptor,
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) -> Option<FontRef> {
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self.get_font_maybe_synthesizing_small_caps(
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font_template,
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font_descriptor,
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true, /* synthesize_small_caps */
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)
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}
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fn get_font_maybe_synthesizing_small_caps(
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&self,
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font_template: FontTemplateRef,
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font_descriptor: &FontDescriptor,
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synthesize_small_caps: bool,
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) -> Option<FontRef> {
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// TODO: (Bug #3463): Currently we only support fake small-caps
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// painting. We should also support true small-caps (where the
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// font supports it) in the future.
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let synthesized_small_caps_font =
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if font_descriptor.variant == FontVariantCaps::SmallCaps && synthesize_small_caps {
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let mut small_caps_descriptor = font_descriptor.clone();
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small_caps_descriptor.pt_size =
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font_descriptor.pt_size.scale_by(SMALL_CAPS_SCALE_FACTOR);
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self.get_font_maybe_synthesizing_small_caps(
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font_template.clone(),
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&small_caps_descriptor,
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false, /* synthesize_small_caps */
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)
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} else {
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None
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};
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let cache_key = FontCacheKey {
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font_identifier: font_template.identifier(),
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font_descriptor: font_descriptor.clone(),
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};
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if let Some(font) = self.cache.fonts.read().get(&cache_key).cloned() {
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return font;
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}
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debug!(
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"FontContext::font cache miss for font_template={:?} font_descriptor={:?}",
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font_template, font_descriptor
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);
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// TODO: Inserting `None` into the cache here is a bit bogus. Instead we should somehow
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// mark this template as invalid so it isn't tried again.
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let font = self
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.create_font(
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font_template,
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font_descriptor.to_owned(),
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synthesized_small_caps_font,
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)
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.ok();
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self.cache.fonts.write().insert(cache_key, font.clone());
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font
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}
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fn matching_web_font_templates(
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&self,
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descriptor_to_match: &FontDescriptor,
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family_descriptor: &FontFamilyDescriptor,
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) -> Option<Vec<FontTemplateRef>> {
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if family_descriptor.scope != FontSearchScope::Any {
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return None;
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}
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// Do not look for generic fonts in our list of web fonts.
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let SingleFontFamily::FamilyName(ref family_name) = family_descriptor.family else {
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return None;
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};
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self.web_fonts
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.read()
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.families
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.get(&family_name.name.clone().into())
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.map(|templates| templates.find_for_descriptor(Some(descriptor_to_match)))
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}
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/// Try to find matching templates in this [`FontContext`], first looking in the list of web fonts and
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/// falling back to asking the [`super::FontCacheThread`] for a matching system font.
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pub fn matching_templates(
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&self,
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descriptor_to_match: &FontDescriptor,
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family_descriptor: &FontFamilyDescriptor,
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) -> Vec<FontTemplateRef> {
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self.matching_web_font_templates(descriptor_to_match, family_descriptor)
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.unwrap_or_else(|| {
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self.cache
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.matching_templates(descriptor_to_match, family_descriptor)
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})
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}
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/// Create a `Font` for use in layout calculations, from a `FontTemplateData` returned by the
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/// cache thread and a `FontDescriptor` which contains the styling parameters.
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fn create_font(
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&self,
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font_template: FontTemplateRef,
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font_descriptor: FontDescriptor,
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synthesized_small_caps: Option<FontRef>,
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) -> Result<FontRef, &'static str> {
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let mut font = Font::new(
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font_template.clone(),
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font_descriptor.clone(),
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synthesized_small_caps,
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)?;
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let font_source = self.font_source.lock();
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font.font_key = match font_template.identifier() {
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FontIdentifier::Local(_) => font_source.get_system_font_instance(
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font_template.identifier(),
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font_descriptor.pt_size,
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font.webrender_font_instance_flags(),
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),
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FontIdentifier::Web(_) => self.webrender_font_store.write().get_font_instance(
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&*font_source,
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font_template.clone(),
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font_descriptor.pt_size,
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font.webrender_font_instance_flags(),
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),
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};
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Ok(Arc::new(font))
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}
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}
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#[derive(Clone)]
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pub struct WebFontDownloadState {
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pub css_font_face_descriptors: Arc<CSSFontFaceDescriptors>,
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remaining_sources: Vec<Source>,
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finished_callback: WebFontLoadFinishedCallback,
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core_resource_thread: CoreResourceThread,
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local_fonts: Arc<HashMap<Atom, Option<FontTemplateRef>>>,
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pub stylesheet: DocumentStyleSheet,
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}
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pub trait FontContextWebFontMethods {
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fn add_all_web_fonts_from_stylesheet(
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&self,
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stylesheet: &DocumentStyleSheet,
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guard: &SharedRwLockReadGuard,
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device: &Device,
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finished_callback: WebFontLoadFinishedCallback,
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synchronous: bool,
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) -> usize;
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fn process_next_web_font_source(&self, web_font_download_state: WebFontDownloadState);
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fn remove_all_web_fonts_from_stylesheet(&self, stylesheet: &DocumentStyleSheet);
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fn collect_unused_webrender_resources(&self, all: bool)
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-> (Vec<FontKey>, Vec<FontInstanceKey>);
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}
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impl<S: FontSource + Send + 'static> FontContextWebFontMethods for Arc<FontContext<S>> {
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fn add_all_web_fonts_from_stylesheet(
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&self,
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stylesheet: &DocumentStyleSheet,
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guard: &SharedRwLockReadGuard,
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device: &Device,
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finished_callback: WebFontLoadFinishedCallback,
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synchronous: bool,
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) -> usize {
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let (finished_callback, synchronous_receiver) = if synchronous {
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let (sender, receiver) = unbounded();
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let finished_callback = move |_succeeded: bool| {
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let _ = sender.send(());
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};
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(
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Arc::new(finished_callback) as WebFontLoadFinishedCallback,
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Some(receiver),
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)
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} else {
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(finished_callback, None)
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};
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let mut number_loading = 0;
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for rule in stylesheet.effective_rules(device, guard) {
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let CssRule::FontFace(ref lock) = *rule else {
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continue;
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};
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let rule: &FontFaceRule = lock.read_with(guard);
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let Some(font_face) = rule.font_face() else {
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continue;
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};
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let sources: Vec<Source> = font_face
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.sources()
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.0
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.iter()
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.rev()
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.filter(is_supported_web_font_source)
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.cloned()
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.collect();
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if sources.is_empty() {
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continue;
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}
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// Fetch all local fonts first, beacause if we try to fetch them later on during the process of
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// loading the list of web font `src`s we may be running in the context of the router thread, which
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// means we won't be able to seend IPC messages to the FontCacheThread.
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//
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// TODO: This is completely wrong. The specification says that `local()` font-family should match
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// against full PostScript names, but this is matching against font family names. This works...
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// sometimes.
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let mut local_fonts = HashMap::new();
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for source in sources.iter() {
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if let Source::Local(family_name) = source {
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local_fonts
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.entry(family_name.name.clone())
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.or_insert_with(|| {
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let family = SingleFontFamily::FamilyName(FamilyName {
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name: family_name.name.clone(),
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syntax: FontFamilyNameSyntax::Quoted,
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});
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self.font_source
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.lock()
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.find_matching_font_templates(None, &family)
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.first()
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.cloned()
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});
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}
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}
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number_loading += 1;
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self.web_fonts
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.write()
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.handle_web_font_load_started_for_stylesheet(stylesheet);
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self.process_next_web_font_source(WebFontDownloadState {
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css_font_face_descriptors: Arc::new(rule.into()),
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remaining_sources: sources,
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finished_callback: finished_callback.clone(),
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core_resource_thread: self.resource_threads.lock().clone(),
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local_fonts: Arc::new(local_fonts),
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stylesheet: stylesheet.clone(),
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});
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// If the load is synchronous wait for it to be signalled.
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if let Some(ref synchronous_receiver) = synchronous_receiver {
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synchronous_receiver.recv().unwrap();
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}
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}
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number_loading
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}
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fn process_next_web_font_source(&self, mut state: WebFontDownloadState) {
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let Some(source) = state.remaining_sources.pop() else {
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self.web_fonts
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.write()
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.handle_web_font_failed_to_load(&state);
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self.handle_web_font_load_finished(&state.finished_callback, false);
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return;
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};
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let this = self.clone();
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let web_font_family_name = state.css_font_face_descriptors.family_name.clone();
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match source {
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Source::Url(url_source) => {
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RemoteWebFontDownloader::download(url_source, this, web_font_family_name, state)
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},
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Source::Local(ref local_family_name) => {
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if let Some(new_template) = state
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.local_fonts
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.get(&local_family_name.name)
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.cloned()
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.flatten()
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.and_then(|local_template| {
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FontTemplate::new_for_local_web_font(
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local_template,
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&state.css_font_face_descriptors,
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state.stylesheet.clone(),
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)
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.ok()
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})
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{
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let not_cancelled = self
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.web_fonts
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.write()
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.handle_web_font_loaded(&state, new_template);
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self.handle_web_font_load_finished(&state.finished_callback, not_cancelled);
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} else {
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this.process_next_web_font_source(state);
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}
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},
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}
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}
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fn remove_all_web_fonts_from_stylesheet(&self, stylesheet: &DocumentStyleSheet) {
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let mut web_fonts = self.web_fonts.write();
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let mut fonts = self.cache.fonts.write();
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let mut font_groups = self.cache.resolved_font_groups.write();
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// Cancel any currently in-progress web font loads.
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web_fonts.handle_stylesheet_removed(stylesheet);
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let mut removed_any = false;
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for family in web_fonts.families.values_mut() {
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removed_any |= family.remove_templates_for_stylesheet(stylesheet);
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}
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if !removed_any {
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return;
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};
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fonts.retain(|_, font| match font {
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Some(font) => font.template.borrow().stylesheet.as_ref() != Some(stylesheet),
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_ => true,
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});
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|
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// Removing this stylesheet modified the available fonts, so invalidate the cache
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// of resolved font groups.
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font_groups.clear();
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// Ensure that we clean up any WebRender resources on the next display list update.
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self.have_removed_web_fonts.store(true, Ordering::Relaxed);
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}
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fn collect_unused_webrender_resources(
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&self,
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all: bool,
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) -> (Vec<FontKey>, Vec<FontInstanceKey>) {
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if all {
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let mut webrender_font_store = self.webrender_font_store.write();
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self.have_removed_web_fonts.store(false, Ordering::Relaxed);
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return webrender_font_store.remove_all_fonts();
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}
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if !self.have_removed_web_fonts.load(Ordering::Relaxed) {
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return (Vec::new(), Vec::new());
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}
|
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|
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// Lock everything to prevent adding new fonts while we are cleaning up the old ones.
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let web_fonts = self.web_fonts.write();
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let _fonts = self.cache.fonts.write();
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let _font_groups = self.cache.resolved_font_groups.write();
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let mut webrender_font_store = self.webrender_font_store.write();
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let mut unused_identifiers: HashSet<FontIdentifier> = webrender_font_store
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.webrender_font_key_map
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.keys()
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.cloned()
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.collect();
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for templates in web_fonts.families.values() {
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templates.for_all_identifiers(|identifier| {
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unused_identifiers.remove(identifier);
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});
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}
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self.have_removed_web_fonts.store(false, Ordering::Relaxed);
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webrender_font_store.remove_all_fonts_for_identifiers(unused_identifiers)
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}
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}
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|
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struct RemoteWebFontDownloader<FCT: FontSource> {
|
|
font_context: Arc<FontContext<FCT>>,
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|
url: ServoArc<Url>,
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|
web_font_family_name: LowercaseFontFamilyName,
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|
response_valid: Mutex<bool>,
|
|
response_data: Mutex<Vec<u8>>,
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|
}
|
|
|
|
enum DownloaderResponseResult {
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|
InProcess,
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Finished,
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|
Failure,
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|
}
|
|
|
|
impl<FCT: FontSource + Send + 'static> RemoteWebFontDownloader<FCT> {
|
|
fn download(
|
|
url_source: UrlSource,
|
|
font_context: Arc<FontContext<FCT>>,
|
|
web_font_family_name: LowercaseFontFamilyName,
|
|
state: WebFontDownloadState,
|
|
) {
|
|
// https://drafts.csswg.org/css-fonts/#font-fetching-requirements
|
|
let url = match url_source.url.url() {
|
|
Some(url) => url.clone(),
|
|
None => return,
|
|
};
|
|
|
|
// FIXME: This shouldn't use NoReferrer, but the current documents url
|
|
let request = RequestBuilder::new(url.clone().into(), Referrer::NoReferrer)
|
|
.destination(Destination::Font);
|
|
|
|
debug!("Loading @font-face {} from {}", web_font_family_name, url);
|
|
let downloader = Self {
|
|
font_context,
|
|
url,
|
|
web_font_family_name,
|
|
response_valid: Mutex::new(false),
|
|
response_data: Mutex::default(),
|
|
};
|
|
|
|
let core_resource_thread_clone = state.core_resource_thread.clone();
|
|
fetch_async(
|
|
request,
|
|
&core_resource_thread_clone,
|
|
move |response_message| match downloader.handle_web_font_fetch_message(response_message)
|
|
{
|
|
DownloaderResponseResult::InProcess => {},
|
|
DownloaderResponseResult::Finished => {
|
|
if !downloader.process_downloaded_font_and_signal_completion(&state) {
|
|
downloader
|
|
.font_context
|
|
.process_next_web_font_source(state.clone())
|
|
}
|
|
},
|
|
DownloaderResponseResult::Failure => downloader
|
|
.font_context
|
|
.process_next_web_font_source(state.clone()),
|
|
},
|
|
)
|
|
}
|
|
|
|
/// After a download finishes, try to process the downloaded data, returning true if
|
|
/// the font is added successfully to the [`FontContext`] or false if it isn't.
|
|
fn process_downloaded_font_and_signal_completion(&self, state: &WebFontDownloadState) -> bool {
|
|
if self
|
|
.font_context
|
|
.web_fonts
|
|
.read()
|
|
.font_load_cancelled_for_stylesheet(&state.stylesheet)
|
|
{
|
|
self.font_context
|
|
.handle_web_font_load_finished(&state.finished_callback, false);
|
|
// Returning true here prevents trying to load the next font on the source list.
|
|
return true;
|
|
}
|
|
|
|
let font_data = std::mem::take(&mut *self.response_data.lock());
|
|
trace!(
|
|
"@font-face {} data={:?}",
|
|
self.web_font_family_name,
|
|
font_data
|
|
);
|
|
|
|
let font_data = match fontsan::process(&font_data) {
|
|
Ok(bytes) => bytes,
|
|
Err(error) => {
|
|
debug!(
|
|
"Sanitiser rejected web font: family={} url={:?} with {error:?}",
|
|
self.web_font_family_name, self.url,
|
|
);
|
|
return false;
|
|
},
|
|
};
|
|
|
|
let Ok(new_template) = FontTemplate::new_for_remote_web_font(
|
|
self.url.clone().into(),
|
|
Arc::new(font_data),
|
|
&state.css_font_face_descriptors,
|
|
Some(state.stylesheet.clone()),
|
|
) else {
|
|
return false;
|
|
};
|
|
|
|
let not_cancelled = self
|
|
.font_context
|
|
.web_fonts
|
|
.write()
|
|
.handle_web_font_loaded(state, new_template);
|
|
self.font_context
|
|
.handle_web_font_load_finished(&state.finished_callback, not_cancelled);
|
|
|
|
// If the load was canceled above, then we still want to return true from this function in
|
|
// order to halt any attempt to load sources that come later on the source list.
|
|
true
|
|
}
|
|
|
|
fn handle_web_font_fetch_message(
|
|
&self,
|
|
response_message: FetchResponseMsg,
|
|
) -> DownloaderResponseResult {
|
|
match response_message {
|
|
FetchResponseMsg::ProcessRequestBody | FetchResponseMsg::ProcessRequestEOF => {
|
|
DownloaderResponseResult::InProcess
|
|
},
|
|
FetchResponseMsg::ProcessResponse(meta_result) => {
|
|
trace!(
|
|
"@font-face {} metadata ok={:?}",
|
|
self.web_font_family_name,
|
|
meta_result.is_ok()
|
|
);
|
|
*self.response_valid.lock() = meta_result.is_ok();
|
|
DownloaderResponseResult::InProcess
|
|
},
|
|
FetchResponseMsg::ProcessResponseChunk(new_bytes) => {
|
|
trace!(
|
|
"@font-face {} chunk={:?}",
|
|
self.web_font_family_name,
|
|
new_bytes
|
|
);
|
|
if *self.response_valid.lock() {
|
|
self.response_data.lock().extend(new_bytes)
|
|
}
|
|
DownloaderResponseResult::InProcess
|
|
},
|
|
FetchResponseMsg::ProcessResponseEOF(response) => {
|
|
trace!(
|
|
"@font-face {} EOF={:?}",
|
|
self.web_font_family_name,
|
|
response
|
|
);
|
|
if response.is_err() || !*self.response_valid.lock() {
|
|
return DownloaderResponseResult::Failure;
|
|
}
|
|
DownloaderResponseResult::Finished
|
|
},
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Default)]
|
|
pub struct CachingFontSource<FCT: FontSource> {
|
|
font_cache_thread: ReentrantMutex<FCT>,
|
|
fonts: RwLock<HashMap<FontCacheKey, Option<FontRef>>>,
|
|
templates: RwLock<HashMap<FontTemplateCacheKey, Vec<FontTemplateRef>>>,
|
|
resolved_font_groups:
|
|
RwLock<HashMap<FontGroupCacheKey, Arc<RwLock<FontGroup>>, BuildHasherDefault<FnvHasher>>>,
|
|
}
|
|
|
|
impl<FCT: FontSource> CachingFontSource<FCT> {
|
|
fn new(font_cache_thread: FCT) -> Self {
|
|
Self {
|
|
font_cache_thread: ReentrantMutex::new(font_cache_thread),
|
|
fonts: Default::default(),
|
|
templates: Default::default(),
|
|
resolved_font_groups: Default::default(),
|
|
}
|
|
}
|
|
|
|
fn invalidate_after_web_font_load(&self) {
|
|
self.resolved_font_groups.write().clear();
|
|
}
|
|
|
|
pub fn matching_templates(
|
|
&self,
|
|
descriptor_to_match: &FontDescriptor,
|
|
family_descriptor: &FontFamilyDescriptor,
|
|
) -> Vec<FontTemplateRef> {
|
|
let cache_key = FontTemplateCacheKey {
|
|
font_descriptor: descriptor_to_match.clone(),
|
|
family_descriptor: family_descriptor.clone(),
|
|
};
|
|
if let Some(templates) = self.templates.read().get(&cache_key).cloned() {
|
|
return templates;
|
|
}
|
|
|
|
debug!(
|
|
"CachingFontSource: cache miss for template_descriptor={:?} family_descriptor={:?}",
|
|
descriptor_to_match, family_descriptor
|
|
);
|
|
let templates = self
|
|
.font_cache_thread
|
|
.lock()
|
|
.find_matching_font_templates(Some(descriptor_to_match), &family_descriptor.family);
|
|
self.templates.write().insert(cache_key, templates.clone());
|
|
|
|
templates
|
|
}
|
|
|
|
pub fn font_group_with_size(
|
|
&self,
|
|
style: ServoArc<FontStyleStruct>,
|
|
size: Au,
|
|
) -> Arc<RwLock<FontGroup>> {
|
|
let cache_key = FontGroupCacheKey { size, style };
|
|
if let Some(font_group) = self.resolved_font_groups.read().get(&cache_key) {
|
|
return font_group.clone();
|
|
}
|
|
|
|
let mut descriptor = FontDescriptor::from(&*cache_key.style);
|
|
descriptor.pt_size = size;
|
|
|
|
let font_group = Arc::new(RwLock::new(FontGroup::new(&cache_key.style, descriptor)));
|
|
self.resolved_font_groups
|
|
.write()
|
|
.insert(cache_key, font_group.clone());
|
|
font_group
|
|
}
|
|
}
|
|
|
|
impl<FCT: FontSource> MallocSizeOf for CachingFontSource<FCT> {
|
|
fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
|
|
let font_cache_size = self
|
|
.fonts
|
|
.read()
|
|
.iter()
|
|
.map(|(key, font)| {
|
|
key.size_of(ops) + font.as_ref().map_or(0, |font| (*font).size_of(ops))
|
|
})
|
|
.sum::<usize>();
|
|
let font_template_cache_size = self
|
|
.templates
|
|
.read()
|
|
.iter()
|
|
.map(|(key, templates)| {
|
|
let templates_size = templates
|
|
.iter()
|
|
.map(|template| template.borrow().size_of(ops))
|
|
.sum::<usize>();
|
|
key.size_of(ops) + templates_size
|
|
})
|
|
.sum::<usize>();
|
|
let font_group_cache_size = self
|
|
.resolved_font_groups
|
|
.read()
|
|
.iter()
|
|
.map(|(key, font_group)| key.size_of(ops) + (*font_group.read()).size_of(ops))
|
|
.sum::<usize>();
|
|
|
|
font_cache_size + font_template_cache_size + font_group_cache_size
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Eq, Hash, MallocSizeOf, PartialEq)]
|
|
struct FontCacheKey {
|
|
font_identifier: FontIdentifier,
|
|
font_descriptor: FontDescriptor,
|
|
}
|
|
|
|
#[derive(Debug, Eq, Hash, MallocSizeOf, PartialEq)]
|
|
struct FontTemplateCacheKey {
|
|
font_descriptor: FontDescriptor,
|
|
family_descriptor: FontFamilyDescriptor,
|
|
}
|
|
|
|
#[derive(Debug, MallocSizeOf)]
|
|
struct FontGroupCacheKey {
|
|
#[ignore_malloc_size_of = "This is also stored as part of styling."]
|
|
style: ServoArc<FontStyleStruct>,
|
|
size: Au,
|
|
}
|
|
|
|
impl PartialEq for FontGroupCacheKey {
|
|
fn eq(&self, other: &FontGroupCacheKey) -> bool {
|
|
self.style == other.style && self.size == other.size
|
|
}
|
|
}
|
|
|
|
impl Eq for FontGroupCacheKey {}
|
|
|
|
impl Hash for FontGroupCacheKey {
|
|
fn hash<H>(&self, hasher: &mut H)
|
|
where
|
|
H: Hasher,
|
|
{
|
|
self.style.hash.hash(hasher)
|
|
}
|
|
}
|
|
|
|
fn is_supported_web_font_source(source: &&Source) -> bool {
|
|
let url_source = match source {
|
|
Source::Url(ref url_source) => url_source,
|
|
Source::Local(_) => return true,
|
|
};
|
|
let format_hint = match url_source.format_hint {
|
|
Some(ref format_hint) => format_hint,
|
|
None => return true,
|
|
};
|
|
|
|
if matches!(
|
|
format_hint,
|
|
FontFaceSourceFormat::Keyword(
|
|
FontFaceSourceFormatKeyword::Truetype |
|
|
FontFaceSourceFormatKeyword::Opentype |
|
|
FontFaceSourceFormatKeyword::Woff |
|
|
FontFaceSourceFormatKeyword::Woff2
|
|
)
|
|
) {
|
|
return true;
|
|
}
|
|
|
|
if let FontFaceSourceFormat::String(string) = format_hint {
|
|
return string == "truetype" ||
|
|
string == "opentype" ||
|
|
string == "woff" ||
|
|
string == "woff2";
|
|
}
|
|
|
|
false
|
|
}
|