desktop: Use suitable CJK fonts for each language on Windows

Cargo.lock

@@ -1667,6 +1667,19 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
+[[package]]
+name = "fontdb"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af8d8cbea8f21307d7e84bca254772981296f058a1d36b461bf4d83a7499fc9e"
+dependencies = [
+ "log",
+ "memmap2 0.6.2",
+ "slotmap",
+ "tinyvec",
+ "ttf-parser",
+]
+
 [[package]]
 name = "foreign-types"
 version = "0.3.2"
@@ -2733,6 +2746,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "memmap2"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d28bba84adfe6646737845bc5ebbfa2c08424eb1c37e94a1fd2a82adb56a872"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "memoffset"
 version = "0.6.5"
@@ -3843,6 +3865,7 @@ dependencies = [
  "egui-winit",
  "embed-resource",
  "fluent-templates",
+ "fontdb",
  "futures",
  "generational-arena",
  "isahc",
@@ -4202,7 +4225,7 @@ checksum = "cda4e97be1fd174ccc2aae81c8b694e803fa99b34e8fd0f057a9d70698e3ed09"
 dependencies = [
  "ab_glyph",
  "log",
- "memmap2",
+ "memmap2 0.5.10",
  "smithay-client-toolkit",
  "tiny-skia",
 ]
@@ -4379,7 +4402,7 @@ dependencies = [
  "dlib",
  "lazy_static",
  "log",
- "memmap2",
+ "memmap2 0.5.10",
  "nix 0.24.3",
  "pkg-config",
  "wayland-client",

desktop/src/gui/controller.rs

@@ -14,6 +14,7 @@ use ruffle_render_wgpu::utils::{format_list, get_backend_names};
 use std::rc::Rc;
 use std::sync::{Arc, MutexGuard};
 use std::time::{Duration, Instant};
+use unic_langid::LanguageIdentifier;
 use url::Url;
 use winit::dpi::PhysicalSize;
 use winit::event_loop::EventLoop;
@@ -83,9 +84,7 @@ impl GuiController {
             },
         );
         let descriptors = Descriptors::new(adapter, device, queue);
-        let system_fonts = load_system_fonts().unwrap_or_default();
         let egui_ctx = Context::default();
-        egui_ctx.set_fonts(system_fonts);
         if let Some(Theme::Light) = window.theme() {
             egui_ctx.set_visuals(egui::Visuals::light());
         }
@@ -104,6 +103,8 @@ impl GuiController {
         let egui_renderer = egui_wgpu::Renderer::new(&descriptors.device, surface_format, None, 1);
         let event_loop = event_loop.create_proxy();
         let gui = RuffleGui::new(event_loop, opt.movie_url.clone(), PlayerOptions::from(opt));
+        let system_fonts = load_system_fonts(gui.locale.to_owned()).unwrap_or_default();
+        egui_ctx.set_fonts(system_fonts);
         Ok(Self {
             descriptors: Arc::new(descriptors),
             egui_ctx,
@@ -316,17 +317,33 @@ impl GuiController {
 }
 
 // try to load known unicode supporting fonts to draw cjk characters in egui
-fn load_system_fonts() -> anyhow::Result<egui::FontDefinitions> {
+fn load_system_fonts(locale: LanguageIdentifier) -> anyhow::Result<egui::FontDefinitions> {
     let mut font_database = Database::default();
     font_database.load_system_fonts();
 
-    let system_unicode_fonts = Query {
+    let mut families = Vec::new();
-        families: &[
+    if let Some(windows_font) = match locale.language.as_str() {
-            Family::Name("MS UI Gothic"),     // windows
+        "ja" => Some(Family::Name("MS UI Gothic")),
+        "zh" => Some(match locale.to_string().as_str() {
+            "zh-CN" => Family::Name("Microsoft YaHei"),
+            _ => Family::Name("Microsoft JhengHei"),
+        }),
+        "ko" => Some(Family::Name("Malgun Gothic")),
+        _ => None,
+    } {
+        families.push(windows_font);
+    }
+    families.extend(
+        [
             Family::Name("Arial Unicode MS"), // macos
             Family::Name("Noto Sans"),        // linux
             Family::SansSerif,
-        ],
+        ]
+        .iter(),
+    );
+
+    let system_unicode_fonts = Query {
+        families: &families,
         ..Query::default()
     };