fallback fonts

wgui/src/font_config.rs

@@ -1,3 +1,4 @@
+use cosmic_text::PlatformFallback;
 use parking_lot::Mutex;
 
 #[derive(Default)]
@@ -13,12 +14,15 @@ pub struct WguiFontSystem {
 }
 
 impl WguiFontSystem {
-	pub fn new(config: &WguiFontConfig) -> Self {
+	pub fn new(config: &WguiFontConfig, lang: &str) -> Self {
 		let mut db = cosmic_text::fontdb::Database::new();
 
 		let system = if config.binaries.is_empty() {
 			cosmic_text::FontSystem::new()
 		} else {
+			// needed for fallback
+			db.load_system_fonts();
+
 			for binary in &config.binaries {
 				// binary data is copied and preserved here
 				db.load_font_data(binary.to_vec());
@@ -33,9 +37,7 @@ impl WguiFontSystem {
 			}
 
 			// we don't require anything special, at least for now
-			let locale = String::from("C");
-
-			cosmic_text::FontSystem::new_with_locale_and_db(locale, db)
+			cosmic_text::FontSystem::new_with_locale_and_db_and_fallback(lang.to_string(), db, PlatformFallback)
 		};
 
 		Self {

wgui/src/globals.rs

@@ -72,10 +72,10 @@ impl WguiGlobals {
 		Ok(Self(Rc::new(RefCell::new(Globals {
 			assets_internal,
 			assets_builtin,
-			i18n_builtin,
 			defaults,
 			asset_folder,
-			font_system: WguiFontSystem::new(font_config),
+			font_system: WguiFontSystem::new(font_config, i18n_builtin.get_lang()),
+			i18n_builtin,
 			custom_glyph_cache: CustomGlyphCache::new(),
 		}))))
 	}

wgui/src/i18n.rs

@@ -58,6 +58,7 @@ impl Translation {
 }
 
 pub struct I18n {
+	lang: String,
 	json_root_translated: serde_json::Value, // any language
 	json_root_fallback: serde_json::Value,   // english
 }
@@ -123,11 +124,16 @@ impl I18n {
 		.context("Translation file not valid JSON")?;
 
 		Ok(Self {
+			lang,
 			json_root_translated,
 			json_root_fallback,
 		})
 	}
 
+	pub fn get_lang(&self) -> &str {
+		&self.lang
+	}
+
 	pub fn translate(&mut self, translation_key_full: &str) -> Rc<str> {
 		let mut sections = translation_key_full.split(';');
 		let translation_key = sections.next().map_or(translation_key_full, |a| a);