fix(app): preload embedded Fira fonts

src/app/mod.rs

@@ -45,6 +45,8 @@ pub mod message {
     }
 }
 
+use std::borrow::Cow;
+
 pub use self::command::Command;
 pub use self::core::Core;
 pub use self::settings::Settings;
@@ -72,6 +74,8 @@ pub(crate) fn iced_settings<App: Application>(
     settings: Settings,
     flags: App::Flags,
 ) -> iced::Settings<(Core, App::Flags)> {
+    preload_fonts();
+
     let mut core = Core::default();
     core.debug = settings.debug;
     core.icon_theme_override = settings.default_icon_theme.is_some();
@@ -882,3 +886,21 @@ fn single_instance_subscription<App: ApplicationExt>() -> Subscription<Message<A
         },
     )
 }
+
+const EMBEDDED_FONTS: &[&[u8]] = &[
+    include_bytes!("../../res/Fira/FiraSans-Light.otf"),
+    include_bytes!("../../res/Fira/FiraSans-Regular.otf"),
+    include_bytes!("../../res/Fira/FiraSans-SemiBold.otf"),
+    include_bytes!("../../res/Fira/FiraSans-Bold.otf"),
+    include_bytes!("../../res/Fira/FiraMono-Regular.otf"),
+];
+
+fn preload_fonts() {
+    let mut font_system = iced::advanced::graphics::text::font_system()
+        .write()
+        .unwrap();
+
+    EMBEDDED_FONTS
+        .into_iter()
+        .for_each(move |font| font_system.load_font(Cow::Borrowed(font)));
+}

src/font.rs

@@ -4,11 +4,7 @@
 //! Select preferred fonts.
 
 pub use iced::Font;
-use iced::{
+use iced_core::font::{Family, Weight};
-    font::{load, Error},
-    Command,
-};
-use iced_core::font::Family;
 
 pub fn default() -> Font {
     Font::from(crate::config::interface_font())
@@ -16,21 +12,21 @@ pub fn default() -> Font {
 
 pub fn light() -> Font {
     Font {
-        weight: iced_core::font::Weight::Light,
+        weight: Weight::Light,
         ..default()
     }
 }
 
 pub fn semibold() -> Font {
     Font {
-        weight: iced_core::font::Weight::Semibold,
+        weight: Weight::Semibold,
         ..default()
     }
 }
 
 pub fn bold() -> Font {
     Font {
-        weight: iced_core::font::Weight::Bold,
+        weight: Weight::Bold,
         ..default()
     }
 }