add font loader

Cargo.toml

@@ -27,10 +27,13 @@ tokio = { version = "1", features = ["macros", "net", "rt-multi-thread"] }
 webbrowser = { version = "1.0.4", optional = true }
 zip = { version = "7.2.0", features = ["deflate-flate2"], default-features = false }
 
+[target.'cfg(target_os = "linux")'.dependencies]
+fontconfig = { version = "0.10.0", optional = true }
+
 [features]
 default = ["gui"]
 
-gui = ["dep:eframe", "dep:egui", "dep:rfd", "dep:webbrowser", "dep:rand", "dep:current_locale"]
+gui = ["dep:eframe", "dep:egui", "dep:rfd", "dep:webbrowser", "dep:rand", "dep:current_locale", "dep:fontconfig"]
 
 [build-dependencies]
 embed-resource = "3.0.5"

res/font/fonts.json

@@ -0,0 +1,56 @@
+{
+  "windows": {
+    "zh-CN": [
+      "msyh.ttc",
+      "msyhbd.ttc",
+      "simsun.ttc",
+      "simhei.ttf",
+      "simkai.ttf",
+      "simfang.ttf",
+      "msjh.ttc",
+      "msjhbd.ttc"
+    ],
+    "ja": [
+      "meiryo.ttc",
+      "meiryob.ttc",
+      "msgothic.ttc",
+      "msmincho.ttc",
+      "YuGothM.ttc",
+      "YuGothB.ttc",
+      "YuMincho.ttc"
+    ]
+  },
+  "linux": {
+    "zh-CN": [
+      "Noto Sans CJK SC",
+      "WenQuanYi Micro Hei",
+      "WenQuanYi Zen Hei",
+      "AR PL UMing CN",
+      "AR PL UKai CN"
+    ],
+    "ja": [
+      "Noto Sans CJK JP",
+      "Noto Sans CJK SC",
+      "Noto Sans CJK TC",
+      "Noto Sans JP",
+      "IPAGothic",
+      "IPA Gothic",
+      "VL Gothic"
+    ]
+  },
+  "macos": {
+    "zh-CN": [
+      "PingFang.ttc",
+      "STHeiti Light.ttc",
+      "STHeiti Medium.ttc",
+      "Hiragino Sans GB.ttc",
+      "Arial Unicode.ttf"
+    ],
+    "ja": [
+      "ヒラギノ角ゴシック W3.ttc",
+      "ヒラギノ明朝 ProN.ttc",
+      "ヒラギノ丸ゴ ProN W4.ttc",
+      "Hiragino Sans GB.ttc"
+    ]
+  }
+}

src/ui/font_loader.rs

@@ -0,0 +1,132 @@
+use egui::FontData;
+use egui::FontFamily::{Monospace, Proportional};
+use egui::epaint::text::FontPriority::Lowest;
+use egui::epaint::text::{FontInsert, InsertFontFamily};
+use serde::Deserialize;
+use std::collections::HashMap;
+use log::warn;
+
+const FONT_LIST: &str = include_str!("../../res/font/fonts.json");
+
+#[cfg(target_os = "windows")]
+const WINDOWS_FONT_PATH: &str = r"C:\Windows\Fonts\";
+#[cfg(target_os = "macos")]
+const MACOS_FONT_PATH: &str = "/System/Library/Fonts/";
+#[cfg(target_os = "macos")]
+const MACOS_FONT_PATH_SHARED: &str = "/Library/Fonts/";
+
+#[derive(Deserialize)]
+struct SystemFontList {
+    #[cfg(target_os = "windows")]
+    windows: PlatformFonts,
+    #[cfg(target_os = "linux")]
+    linux: PlatformFonts,
+    #[cfg(target_os = "macos")]
+    macos: PlatformFonts,
+}
+
+type PlatformFonts = HashMap<String, Vec<String>>;
+
+pub fn load_system_font_to_egui(ctx: &egui::Context) {
+    let system_font = find_system_font();
+
+    if system_font.is_empty() {
+        warn!("No system font found, some languages may not display properly.");
+        return;
+    }
+
+    for font in system_font {
+        let font_insert = FontInsert::new(
+            &font.0,
+            font.1,
+            vec![
+                InsertFontFamily {
+                    family: Proportional,
+                    priority: Lowest, // low priority to not override existing fonts
+                },
+                InsertFontFamily {
+                    family: Monospace,
+                    priority: Lowest,
+                },
+            ],
+        );
+
+        ctx.add_font(font_insert);
+    }
+}
+
+fn find_system_font() -> HashMap<String, FontData> {
+    let sys_font_list: SystemFontList =
+        serde_json::from_str(FONT_LIST).expect("failed to parse font list");
+
+    let mut result: HashMap<String, FontData> = HashMap::new();
+
+    #[cfg(target_os = "windows")]
+    {
+        load_fonts_from_paths(&sys_font_list.windows, &[WINDOWS_FONT_PATH], &mut result);
+    }
+
+    #[cfg(target_os = "macos")]
+    {
+        load_fonts_from_paths(
+            &sys_font_list.macos,
+            &[MACOS_FONT_PATH, MACOS_FONT_PATH_SHARED],
+            &mut result,
+        );
+    }
+
+    #[cfg(target_os = "linux")]
+    {
+        // use fontconfig for linux fo find fonts
+        load_fonts_from_fontconfig(&sys_font_list.linux, &mut result);
+    }
+
+    result
+}
+
+#[cfg(any(target_os = "windows", target_os = "macos"))]
+fn load_fonts_from_paths(
+    platform_fonts: &PlatformFonts,
+    search_paths: &[&str],
+    result: &mut HashMap<String, FontData>,
+) {
+    for (language, font_files) in platform_fonts {
+        let mut loaded = false;
+        for font_file in font_files {
+            for search_path in search_paths {
+                let font_path = format!("{}{}", search_path, font_file);
+                if let Ok(font_data) = std::fs::read(&font_path) {
+                    result.insert(language.to_string(), FontData::from_owned(font_data));
+                    loaded = true;
+                    break;
+                }
+            }
+            if loaded {
+                break;
+            }
+        }
+    }
+}
+
+#[cfg(all(target_os = "linux", feature = "gui"))]
+fn load_fonts_from_fontconfig(
+    platform_fonts: &PlatformFonts,
+    result: &mut HashMap<String, FontData>,
+) {
+    use fontconfig::Fontconfig;
+
+    if let Some(fc) = Fontconfig::new() {
+        platform_fonts.iter().for_each(|(language, font_names)| {
+            for font_name in font_names {
+                if let Some(font) = fc.find(font_name, None) {
+                    if let Ok(data) = std::fs::read(font.path) {
+                        result.insert(language.to_string(), FontData::from_owned(data));
+                        break;
+                    }
+                }
+            }
+        })
+    } else {
+        warn!("Failed to init Fontconfig")
+    }
+}

src/ui/gui.rs

@@ -31,6 +31,8 @@ use egui::{
 };
 use std::hash::Hash;
 
+use crate::ui::font_loader::load_system_font_to_egui;
+
 #[derive(PartialEq, Clone, Copy, Debug)]
 enum Mode {
     Client,
@@ -80,7 +82,12 @@ async fn create_window() -> Result<(), InstallerError> {
     eframe::run_native(
         &("Ornithe Installer ".to_owned() + crate::VERSION),
         options,
-        Box::new(|_cc| Ok(Box::new(app))),
+        Box::new(|_cc| {
+            // load needed system fonts
+            load_system_font_to_egui(&_cc.egui_ctx);
+
+            Ok(Box::new(app))
+        }),
     )?;
     Ok(())
 }

src/ui/mod.rs

@@ -5,6 +5,9 @@ pub mod cli;
 #[cfg(feature = "gui")]
 pub mod gui;
 
+#[cfg(feature = "gui")]
+mod font_loader;
+
 fn home_dir() -> Option<PathBuf> {
     #[allow(deprecated)]
     std::env::home_dir()