103 lines
2.6 KiB
Rust
103 lines
2.6 KiB
Rust
// 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, FontMatches};
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/// Access system fonts
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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 = 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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//TODO: allow loading fonts from memory
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let mut db = fontdb::Database::new();
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{
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let now = std::time::Instant::now();
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db.load_fonts_dir("/ui/fonts");
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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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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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{
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let now = std::time::Instant::now();
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//TODO only do this on demand!
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for i in 0..db.faces().len() {
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let id = db.faces()[i].id;
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unsafe {
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db.make_shared_face_data(id);
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}
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}
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log::info!(
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"Mapped {} 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 { 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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// Clippy false positive
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#[allow(clippy::needless_lifetimes)]
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pub fn get_font<'a>(&'a self, id: fontdb::ID) -> Option<Arc<Font<'a>>> {
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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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pub fn get_font_matches<'a>(&'a self, attrs: Attrs) -> Arc<FontMatches<'a>> {
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let mut fonts = Vec::new();
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for face in self.db.faces() {
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if !attrs.matches(face) {
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continue;
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}
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if let Some(font) = self.get_font(face.id) {
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fonts.push(font);
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}
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}
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Arc::new(FontMatches {
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locale: &self.locale,
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default_family: self.db.family_name(&attrs.family).to_string(),
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fonts,
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})
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}
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}
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