Unify the no_std and std impls of FontSystem
This commit is contained in:
John Nunley
parent
bd58940c42
commit
faa1ceafda
5 changed files with 207 additions and 253 deletions
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@ -21,6 +21,8 @@ unicode-linebreak = "0.1.4"
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unicode-script = "0.5.5"
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unicode-segmentation = "1.10.0"
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rangemap = "1.2.0"
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hashbrown = { version = "0.14.0", default-features = false }
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rustc-hash = { version = "1.1.0", default-features = false }
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[dependencies.unicode-bidi]
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version = "0.3.8"
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205
src/font/system.rs
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205
src/font/system.rs
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@ -0,0 +1,205 @@
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use crate::{Attrs, AttrsOwned, Font};
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use alloc::string::String;
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use alloc::sync::Arc;
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use core::fmt;
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use core::hash::BuildHasherDefault;
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use core::ops::{Deref, DerefMut};
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type HashMap<K, V> = hashbrown::HashMap<K, V, BuildHasherDefault<rustc_hash::FxHasher>>;
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// re-export fontdb and rustybuzz
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pub use fontdb;
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pub use rustybuzz;
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/// Access to the system fonts.
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pub struct FontSystem {
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/// The locale of the system.
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locale: String,
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/// The underlying font database.
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db: fontdb::Database,
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/// Cache for loaded fonts from the database.
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font_cache: HashMap<fontdb::ID, Option<Arc<Font>>>,
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/// Cache for font matches.
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font_matches_cache: HashMap<AttrsOwned, Arc<Vec<fontdb::ID>>>,
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}
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impl fmt::Debug for FontSystem {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("FontSystem")
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.field("locale", &self.locale)
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.field("db", &self.db)
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.finish()
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}
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}
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impl FontSystem {
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/// Create a new [`FontSystem`], that allows access to any installed system fonts
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///
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/// # Timing
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///
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/// This function takes some time to run. On the release build, it can take up to a second,
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/// while debug builds can take up to ten times longer. For this reason, it should only be
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/// called once, and the resulting [`FontSystem`] should be shared.
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pub fn new() -> Self {
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Self::new_with_fonts(std::iter::empty())
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}
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/// Create a new [`FontSystem`] with a pre-specified set of fonts.
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pub fn new_with_fonts(fonts: impl IntoIterator<Item = fontdb::Source>) -> Self {
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let locale = Self::get_locale();
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log::debug!("Locale: {}", locale);
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let mut db = fontdb::Database::new();
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Self::load_fonts(&mut db, fonts.into_iter());
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//TODO: configurable default fonts
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db.set_monospace_family("Fira Mono");
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db.set_sans_serif_family("Fira Sans");
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db.set_serif_family("DejaVu Serif");
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Self::new_with_locale_and_db(locale, db)
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}
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/// Create a new [`FontSystem`] with a pre-specified locale and font database.
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pub fn new_with_locale_and_db(locale: String, db: fontdb::Database) -> Self {
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Self {
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locale,
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db,
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font_cache: HashMap::default(),
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font_matches_cache: HashMap::default(),
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}
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}
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/// Get the locale.
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pub fn locale(&self) -> &str {
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&self.locale
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}
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/// Get the database.
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pub fn db(&self) -> &fontdb::Database {
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&self.db
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}
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/// Get a mutable reference to the database.
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pub fn db_mut(&mut self) -> &mut fontdb::Database {
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self.font_matches_cache.clear();
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&mut self.db
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}
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/// Consume this [`FontSystem`] and return the locale and database.
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pub fn into_locale_and_db(self) -> (String, fontdb::Database) {
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(self.locale, self.db)
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}
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/// Get a font by its ID.
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pub fn get_font(&mut self, id: fontdb::ID) -> Option<Arc<Font>> {
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self.font_cache
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.entry(id)
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.or_insert_with(|| {
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unsafe {
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self.db.make_shared_face_data(id);
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}
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let face = self.db.face(id)?;
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match Font::new(face) {
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Some(font) => Some(Arc::new(font)),
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None => {
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log::warn!("failed to load font '{}'", face.post_script_name);
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None
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}
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}
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})
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.clone()
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}
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pub fn get_font_matches(&mut self, attrs: Attrs<'_>) -> Arc<Vec<fontdb::ID>> {
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self.font_matches_cache
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//TODO: do not create AttrsOwned unless entry does not already exist
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.entry(AttrsOwned::new(attrs))
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.or_insert_with(|| {
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#[cfg(not(target_arch = "wasm32"))]
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let now = std::time::Instant::now();
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let ids = self
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.db
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.faces()
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.filter(|face| attrs.matches(face))
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.map(|face| face.id)
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.collect::<Vec<_>>();
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#[cfg(not(target_arch = "wasm32"))]
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{
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let elapsed = now.elapsed();
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log::debug!("font matches for {:?} in {:?}", attrs, elapsed);
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}
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Arc::new(ids)
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})
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.clone()
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}
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#[cfg(feature = "std")]
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fn get_locale() -> String {
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sys_locale::get_locale().unwrap_or_else(|| {
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log::warn!("failed to get system locale, falling back to en-US");
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String::from("en-US")
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})
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}
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#[cfg(not(feature = "std"))]
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fn get_locale() -> String {
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String::from("en-US")
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}
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#[cfg(feature = "std")]
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fn load_fonts(db: &mut fontdb::Database, fonts: impl Iterator<Item = fontdb::Source>) {
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#[cfg(not(target_arch = "wasm32"))]
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let now = std::time::Instant::now();
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#[cfg(target_os = "redox")]
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db.load_fonts_dir("/ui/fonts");
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db.load_system_fonts();
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for source in fonts {
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db.load_font_source(source);
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}
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#[cfg(not(target_arch = "wasm32"))]
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log::info!(
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"Parsed {} font faces in {}ms.",
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db.len(),
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now.elapsed().as_millis()
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);
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}
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#[cfg(not(feature = "std"))]
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fn load_fonts(db: &mut fontdb::Database, fonts: impl Iterator<Item = fontdb::Source>) {
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for source in fonts {
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db.load_font_source(source);
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}
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}
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}
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/// A value borrowed together with an [`FontSystem`]
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#[derive(Debug)]
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pub struct BorrowedWithFontSystem<'a, T> {
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pub(crate) inner: &'a mut T,
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pub(crate) font_system: &'a mut FontSystem,
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}
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impl<'a, T> Deref for BorrowedWithFontSystem<'a, T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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self.inner
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}
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}
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impl<'a, T> DerefMut for BorrowedWithFontSystem<'a, T> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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self.inner
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}
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}
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@ -1,36 +0,0 @@
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use core::ops::{Deref, DerefMut};
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#[cfg(not(feature = "std"))]
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pub use self::no_std::*;
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#[cfg(not(feature = "std"))]
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mod no_std;
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#[cfg(feature = "std")]
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pub use self::std::*;
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#[cfg(feature = "std")]
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mod std;
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// re-export fontdb and rustybuzz
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pub use fontdb;
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pub use rustybuzz;
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/// A value borrowed together with an [`FontSystem`]
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#[derive(Debug)]
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pub struct BorrowedWithFontSystem<'a, T> {
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pub(crate) inner: &'a mut T,
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pub(crate) font_system: &'a mut FontSystem,
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}
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impl<'a, T> Deref for BorrowedWithFontSystem<'a, T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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self.inner
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}
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}
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impl<'a, T> DerefMut for BorrowedWithFontSystem<'a, T> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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self.inner
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}
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}
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@ -1,73 +0,0 @@
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// SPDX-License-Identifier: MIT OR Apache-2.0
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use alloc::{
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string::{String, ToString},
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sync::Arc,
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vec::Vec,
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};
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use crate::{Attrs, Font};
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/// Access system fonts
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#[derive(Debug)]
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pub struct FontSystem {
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locale: String,
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db: fontdb::Database,
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}
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impl FontSystem {
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pub fn new() -> Self {
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let locale = "en-US".to_string();
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let mut db = fontdb::Database::new();
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{
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db.set_monospace_family("Fira Mono");
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db.set_sans_serif_family("Fira Sans");
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db.set_serif_family("DejaVu Serif");
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}
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Self { locale, db }
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}
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pub fn new_with_locale_and_db(locale: String, db: fontdb::Database) -> Self {
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Self { locale, db }
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}
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pub fn locale(&self) -> &str {
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&self.locale
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}
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pub fn db(&self) -> &fontdb::Database {
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&self.db
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}
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pub fn db_mut(&mut self) -> &mut fontdb::Database {
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&mut self.db
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}
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pub fn get_font(&self, id: fontdb::ID) -> Option<Arc<Font>> {
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get_font(&self.db, id)
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}
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pub fn get_font_matches(&mut self, attrs: Attrs) -> Arc<Vec<fontdb::ID>> {
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let ids = self
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.db
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.faces()
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.filter(|face| attrs.matches(face))
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.map(|face| face.id)
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.collect::<Vec<_>>();
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Arc::new(ids)
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}
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}
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fn get_font(db: &fontdb::Database, id: fontdb::ID) -> Option<Arc<Font>> {
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let face = db.face(id)?;
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match Font::new(face) {
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Some(font) => Some(Arc::new(font)),
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None => {
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log::warn!("failed to load font '{}'", face.post_script_name);
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None
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}
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}
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}
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@ -1,144 +0,0 @@
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// SPDX-License-Identifier: MIT OR Apache-2.0
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use std::{collections::HashMap, sync::Arc};
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use crate::{Attrs, AttrsOwned, Font};
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/// Access system fonts
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#[derive(Debug)]
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pub struct FontSystem {
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locale: String,
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db: fontdb::Database,
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font_cache: HashMap<fontdb::ID, Option<Arc<Font>>>,
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font_matches_cache: HashMap<AttrsOwned, Arc<Vec<fontdb::ID>>>,
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}
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impl FontSystem {
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/// Create a new [`FontSystem`], that allows access to any installed system fonts
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///
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/// # Timing
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///
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/// This function takes some time to run. On the release build, it can take up to a second,
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/// while debug builds can take up to ten times longer. For this reason, it should only be
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/// called once, and the resulting [`FontSystem`] should be shared.
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pub fn new() -> Self {
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Self::new_with_fonts(std::iter::empty())
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}
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pub fn new_with_fonts(fonts: impl Iterator<Item = fontdb::Source>) -> Self {
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let locale = sys_locale::get_locale().unwrap_or_else(|| {
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log::warn!("failed to get system locale, falling back to en-US");
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String::from("en-US")
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});
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log::debug!("Locale: {}", locale);
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let mut db = fontdb::Database::new();
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{
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#[cfg(not(target_arch = "wasm32"))]
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let now = std::time::Instant::now();
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#[cfg(target_os = "redox")]
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db.load_fonts_dir("/ui/fonts");
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db.load_system_fonts();
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for source in fonts {
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db.load_font_source(source);
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}
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//TODO: configurable default fonts
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db.set_monospace_family("Fira Mono");
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db.set_sans_serif_family("Fira Sans");
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db.set_serif_family("DejaVu Serif");
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#[cfg(not(target_arch = "wasm32"))]
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log::info!(
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"Parsed {} font faces in {}ms.",
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db.len(),
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now.elapsed().as_millis()
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);
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}
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Self::new_with_locale_and_db(locale, db)
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}
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/// Create a new [`FontSystem`], manually specifying the current locale and font database.
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pub fn new_with_locale_and_db(locale: String, db: fontdb::Database) -> Self {
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Self {
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locale,
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db,
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font_cache: HashMap::new(),
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font_matches_cache: HashMap::new(),
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}
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}
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pub fn locale(&self) -> &str {
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&self.locale
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}
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pub fn db(&self) -> &fontdb::Database {
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&self.db
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}
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pub fn db_mut(&mut self) -> &mut fontdb::Database {
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self.font_matches_cache.clear();
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&mut self.db
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}
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pub fn into_locale_and_db(self) -> (String, fontdb::Database) {
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(self.locale, self.db)
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}
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pub fn get_font(&mut self, id: fontdb::ID) -> Option<Arc<Font>> {
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get_font(&mut self.font_cache, &mut self.db, id)
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}
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pub fn get_font_matches(&mut self, attrs: Attrs) -> Arc<Vec<fontdb::ID>> {
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self.font_matches_cache
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//TODO: do not create AttrsOwned unless entry does not already exist
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.entry(AttrsOwned::new(attrs))
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.or_insert_with(|| {
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#[cfg(not(target_arch = "wasm32"))]
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let now = std::time::Instant::now();
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let ids = self
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.db
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.faces()
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.filter(|face| attrs.matches(face))
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.map(|face| face.id)
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.collect::<Vec<_>>();
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#[cfg(not(target_arch = "wasm32"))]
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{
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let elapsed = now.elapsed();
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log::debug!("font matches for {:?} in {:?}", attrs, elapsed);
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}
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Arc::new(ids)
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})
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.clone()
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}
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}
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fn get_font(
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font_cache: &mut HashMap<fontdb::ID, Option<Arc<Font>>>,
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db: &mut fontdb::Database,
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id: fontdb::ID,
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) -> Option<Arc<Font>> {
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font_cache
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.entry(id)
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.or_insert_with(|| {
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unsafe {
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db.make_shared_face_data(id);
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}
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let face = db.face(id)?;
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match Font::new(face) {
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Some(font) => Some(Arc::new(font)),
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None => {
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log::warn!("failed to load font '{}'", face.post_script_name);
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None
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}
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}
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})
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.clone()
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}
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