feat: add web CJK font loading and robust cross-platform font detection

apps/solvecraft-web/Cargo.toml

@@ -29,5 +29,5 @@ web-sys = { version = "0.3", features = [
     "Window", "Document", "Element", "HtmlElement", "HtmlCanvasElement", "Location", "Navigator", "StorageManager",
     "FileSystemHandle", "FileSystemDirectoryHandle", "FileSystemFileHandle", "FileSystemGetFileOptions", "FileSystemWritableFileStream",
     "WritableStream", "File", "FileList", "Blob", "BlobPropertyBag", "Url", "HtmlAnchorElement", "HtmlInputElement", "Storage",
-    "BeforeUnloadEvent", "Event", "EventTarget",
+    "BeforeUnloadEvent", "Event", "EventTarget", "Response",
 ] }

apps/solvecraft-web/src/main.rs

@@ -334,6 +334,45 @@ mod web {
         web_sys::window().and_then(|w| w.location().search().ok()).unwrap_or_default()
     }
 
+    /// Fetch font bytes asynchronously through the browser.
+    async fn fetch_font_bytes(url: &str) -> Result<Vec<u8>, String> {
+        let window = web_sys::window().ok_or("no window")?;
+        let resp_val = wasm_bindgen_futures::JsFuture::from(window.fetch_with_str(url)).await.map_err(|e| format!("{e:?}"))?;
+        let resp: web_sys::Response = resp_val.dyn_into().map_err(|_| "response cast failed")?;
+        if !resp.ok() {
+            return Err(format!("HTTP {}", resp.status()));
+        }
+        let ab_val = wasm_bindgen_futures::JsFuture::from(resp.array_buffer().map_err(|e| format!("{e:?}"))?).await.map_err(|e| format!("{e:?}"))?;
+        let uint8_arr = js_sys::Uint8Array::new(&ab_val);
+        Ok(uint8_arr.to_vec())
+    }
+
+    /// Load Japanese/CJK fallback font in the browser.
+    fn load_web_fonts(ctx: egui::Context) {
+        wasm_bindgen_futures::spawn_local(async move {
+            let urls = [
+                "./fonts/BIZUDPGothic-Regular.ttf",
+                "./fonts/NotoSansCJKjp-Regular.otf",
+                "https://cdn.jsdelivr.net/gh/googlefonts/morisawa-biz-ud-gothic@main/fonts/ttf/BIZUDPGothic-Regular.ttf",
+            ];
+
+            for url in urls {
+                match fetch_font_bytes(url).await {
+                    Ok(bytes) => {
+                        if solvecraft_ui_egui::fonts::install_cjk_font(&ctx, bytes) {
+                            log::info!("loaded web CJK font from {url}");
+                            ctx.request_repaint();
+                            break;
+                        }
+                    }
+                    Err(err) => {
+                        log::debug!("fetching font from {url} failed: {err}");
+                    }
+                }
+            }
+        });
+    }
+
     pub fn start() {
         eframe::WebLogger::init(log::LevelFilter::Info).ok();
         wasm_bindgen_futures::spawn_local(async {
@@ -355,6 +394,8 @@ mod web {
                     canvas,
                     options,
                     Box::new(move |cc| {
+                        solvecraft_ui_egui::fonts::setup_fonts(&cc.egui_ctx);
+                        load_web_fonts(cc.egui_ctx.clone());
                         let files = Rc::new(Files::default());
                         files::start(&files);
                         let panel = files.clone();

crates/engine/src/cmd/component_clone.rs

@@ -515,20 +515,16 @@ pub(super) fn paste(
                     | L::Body { body }
                     | L::Vertex { body, .. }
                     | L::Iso { body, .. }
-                    | L::Spun { body, .. } => {
-                        if !bodies.contains_key(body) {
-                            notices.push(format!("{} retains external linked body {body}", feature.name));
-                        }
+                    | L::Spun { body, .. }
+                        if !bodies.contains_key(body) =>
+                    {
+                        notices.push(format!("{} retains external linked body {body}", feature.name));
                     }
-                    L::SketchCurve { sketch, .. } | L::SketchPoint { sketch, .. } => {
-                        if !features.contains_key(sketch) {
-                            notices.push(format!("{} retains external linked sketch {sketch}", feature.name));
-                        }
+                    L::SketchCurve { sketch, .. } | L::SketchPoint { sketch, .. } if !features.contains_key(sketch) => {
+                        notices.push(format!("{} retains external linked sketch {sketch}", feature.name));
                     }
-                    L::OnSurface { sketch, body, .. } => {
-                        if !features.contains_key(sketch) || !bodies.contains_key(body) {
-                            notices.push(format!("{} retains external surface link", feature.name));
-                        }
+                    L::OnSurface { sketch, body, .. } if !features.contains_key(sketch) || !bodies.contains_key(body) => {
+                        notices.push(format!("{} retains external surface link", feature.name));
                     }
                     L::Intersection { a, b } => {
                         pending.push(a);

crates/kernel/src/coplanar.rs

@@ -508,7 +508,7 @@ pub(crate) fn bore_union(a: &Body, b: &Body, accept: &dyn Fn(&Body) -> bool) ->
             let Some(radial) = (q - along).normalized() else { continue };
             let on = along + radial * c.radius;
             let e = (c.radius * 0.05).max(size * 1e-4);
-            if !(inside.contains(on + radial * e) && !inside.contains(on - radial * e)) {
+            if !inside.contains(on + radial * e) || inside.contains(on - radial * e) {
                 continue;
             }
             // The cylinder over the tool's length holds no material of either body.

crates/ui-egui/src/canvas.rs

@@ -217,13 +217,8 @@ fn draw(app: &SolveApp, ui: &mut egui::Ui, painter: &egui::Painter, proj: &Proj,
         None
     };
     let sign = match (to_span, &d.kind) {
-        (Some(span), _) => {
-            if span < 0.0 {
-                -1.0
-            } else {
-                1.0
-            }
-        }
+        (Some(span), _) if span < 0.0 => -1.0,
+        (Some(_), _) => 1.0,
         (_, Kind::Extrude { direction: 1, .. }) => -1.0,
         _ => 1.0,
     };

crates/ui-egui/src/fonts.rs

@@ -1,8 +1,20 @@
-//! System font loading and fallback setup for multi-language (CJK/Japanese) support.
-
-#[cfg(not(target_arch = "wasm32"))]
 use std::sync::Arc;
 
+/// Install font bytes as fallback for Proportional and Monospace font families.
+/// Returns true if the font was parsed and installed successfully.
+pub fn install_cjk_font(ctx: &egui::Context, bytes: Vec<u8>) -> bool {
+    if ttf_parser::Face::parse(&bytes, 0).is_err() {
+        return false;
+    }
+
+    let mut fonts = egui::FontDefinitions::default();
+    fonts.font_data.insert("cjk_fallback".to_owned(), Arc::new(egui::FontData::from_owned(bytes)));
+    fonts.families.entry(egui::FontFamily::Proportional).or_default().push("cjk_fallback".to_owned());
+    fonts.families.entry(egui::FontFamily::Monospace).or_default().push("cjk_fallback".to_owned());
+    ctx.set_fonts(fonts);
+    true
+}
+
 /// Candidate font paths to look for on different operating systems.
 #[cfg(not(target_arch = "wasm32"))]
 const FONT_CANDIDATES: &[&str] = &[
@@ -12,45 +24,167 @@ const FONT_CANDIDATES: &[&str] = &[
     "C:\\Windows\\Fonts\\YuGothR.ttc",
     "C:\\Windows\\Fonts\\msgothic.ttc",
     "C:\\Windows\\Fonts\\BIZ-UDGothicR.ttc",
+    "C:\\Windows\\Fonts\\BIZ-UDMinchoM.ttc",
+    "C:\\Windows\\Fonts\\yumin.ttf",
     // macOS
     "/System/Library/Fonts/ヒラギノ角ゴシック W3.ttc",
-    "/System/Library/Fonts/Hiragino Sans GB.ttc",
+    "/System/Library/Fonts/Hiragino Sans W3.ttc",
+    "/System/Library/Fonts/Hiragino Sans W4.ttc",
+    "/System/Library/Fonts/Hiragino Sans W6.ttc",
+    "/System/Library/Fonts/Supplemental/Hiragino Sans W3.ttc",
+    "/System/Library/Fonts/Supplemental/Arial Unicode.ttf",
+    "/System/Library/Fonts/Supplemental/Songti.ttc",
     "/System/Library/Fonts/PingFang.ttc",
+    "/System/Library/Fonts/Hiragino Sans GB.ttc",
+    "/System/Library/Fonts/AppleSDGothicNeo.ttc",
     "/Library/Fonts/Arial Unicode.ttf",
+    "/Library/Fonts/Hiragino Sans W3.ttc",
     // Linux
     "/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
     "/usr/share/fonts/truetype/noto/NotoSansCJK-Regular.ttc",
     "/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc",
+    "/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc",
+    "/usr/share/fonts/noto-cjk/NotoSansCJKjp-Regular.otf",
+    "/usr/share/fonts/opentype/noto/NotoSansCJK-Bold.ttc",
+    "/usr/share/fonts/opentype/ipafont-gothic/ipag.ttf",
+    "/usr/share/fonts/truetype/fonts-japanese-gothic.ttf",
+    "/usr/share/fonts/truetype/takao-gothic/TakaoPGothic.ttf",
+    "/usr/share/fonts/truetype/takao-gothic/TakaoGothic.ttf",
+    "/usr/share/fonts/truetype/vlgothic/VL-PGothic-Regular.ttf",
+    "/usr/share/fonts/truetype/ipafont/ipag.ttf",
+    "/usr/share/fonts/truetype/ipaexfont/ipaexg.ttf",
+    "/usr/share/fonts/opentype/ipafont/ipag.ttf",
+    "/usr/share/fonts/opentype/ipaexfont/ipaexg.ttf",
     "/usr/share/fonts/truetype/droid/DroidSansFallbackFull.ttf",
+    "/usr/share/fonts/cjkuni-uming/uming.ttc",
 ];
 
+#[cfg(not(target_arch = "wasm32"))]
+fn try_read_font(path: &std::path::Path) -> Option<Vec<u8>> {
+    if let Ok(bytes) = std::fs::read(path)
+        && ttf_parser::Face::parse(&bytes, 0).is_ok()
+    {
+        Some(bytes)
+    } else {
+        None
+    }
+}
+
+/// Recursively search for matching CJK font files up to a bounded depth.
+#[cfg(not(target_arch = "wasm32"))]
+fn scan_dir_for_font(dir: &std::path::Path, keywords: &[&str], depth_remaining: usize) -> Option<Vec<u8>> {
+    if depth_remaining == 0 {
+        return None;
+    }
+    let rd = std::fs::read_dir(dir).ok()?;
+    let mut subdirs = Vec::new();
+
+    for entry in rd.flatten() {
+        let p = entry.path();
+        if p.is_file() {
+            let name = p.file_name().map(|n| n.to_string_lossy().to_ascii_lowercase()).unwrap_or_default();
+            let is_font = name.ends_with(".ttc") || name.ends_with(".ttf") || name.ends_with(".otf");
+            if is_font
+                && keywords.iter().any(|k| name.contains(k))
+                && let Some(bytes) = try_read_font(&p)
+            {
+                return Some(bytes);
+            }
+        } else if p.is_dir() {
+            subdirs.push(p);
+        }
+    }
+
+    for sub in subdirs {
+        if let Some(bytes) = scan_dir_for_font(&sub, keywords, depth_remaining.saturating_sub(1)) {
+            return Some(bytes);
+        }
+    }
+
+    None
+}
+
+/// Find a CJK fallback font on the local system or in CRAFT_FONTS_DIR.
+#[cfg(not(target_arch = "wasm32"))]
+fn find_system_cjk_font() -> Option<Vec<u8>> {
+    // 1. Check optional craft-fonts pack directory if specified.
+    if let Ok(craft_dir) = std::env::var("CRAFT_FONTS_DIR") {
+        let dir = std::path::Path::new(&craft_dir);
+        let names = ["BIZUDPGothic-Regular.ttf", "BIZ-UDGothicR.ttc", "NotoSansCJK-Regular.ttc", "NotoSansJP-Regular.ttf"];
+        for name in names {
+            if let Some(bytes) = try_read_font(&dir.join(name)) {
+                return Some(bytes);
+            }
+        }
+    }
+
+    // 2. Check well-known candidate paths.
+    for path in FONT_CANDIDATES {
+        if let Some(bytes) = try_read_font(std::path::Path::new(path)) {
+            return Some(bytes);
+        }
+    }
+
+    // 3. Platform-specific dynamic directory search.
+    #[cfg(target_os = "windows")]
+    {
+        if let Ok(windir) = std::env::var("WINDIR").or_else(|_| std::env::var("SystemRoot")) {
+            let fonts_dir = std::path::PathBuf::from(windir).join("Fonts");
+            let names = ["meiryo.ttc", "YuGothM.ttc", "YuGothR.ttc", "msgothic.ttc", "BIZ-UDGothicR.ttc"];
+            for name in names {
+                if let Some(bytes) = try_read_font(&fonts_dir.join(name)) {
+                    return Some(bytes);
+                }
+            }
+        }
+        if let Ok(local) = std::env::var("LOCALAPPDATA") {
+            let user_fonts = std::path::PathBuf::from(local).join("Microsoft").join("Windows").join("Fonts");
+            if let Some(bytes) = scan_dir_for_font(&user_fonts, &["biz", "gothic", "noto", "yugoth"], 2) {
+                return Some(bytes);
+            }
+        }
+    }
+
+    #[cfg(target_os = "macos")]
+    {
+        let dirs = ["/System/Library/Fonts", "/System/Library/Fonts/Supplemental", "/Library/Fonts"];
+        let keywords = ["hiragino", "pingfang", "arial unicode", "songti", "gothic"];
+        for d in dirs {
+            if let Some(bytes) = scan_dir_for_font(std::path::Path::new(d), &keywords, 2) {
+                return Some(bytes);
+            }
+        }
+    }
+
+    #[cfg(target_os = "linux")]
+    {
+        let search_dirs = [std::path::PathBuf::from("/usr/share/fonts"), std::path::PathBuf::from("/usr/local/share/fonts")];
+        let keywords = ["notosanscjk", "noto", "cjk", "takao", "vlgothic", "ipa", "droid"];
+        for dir in &search_dirs {
+            if let Some(bytes) = scan_dir_for_font(dir, &keywords, 3) {
+                return Some(bytes);
+            }
+        }
+        if let Ok(home) = std::env::var("HOME") {
+            let user_fonts = std::path::PathBuf::from(home).join(".local/share/fonts");
+            if let Some(bytes) = scan_dir_for_font(&user_fonts, &keywords, 2) {
+                return Some(bytes);
+            }
+        }
+    }
+
+    None
+}
+
 /// Configure font definitions with system CJK fallback if available.
 #[cfg(not(target_arch = "wasm32"))]
 pub fn setup_fonts(ctx: &egui::Context) {
-    let mut font_bytes: Option<Vec<u8>> = None;
-    for path in FONT_CANDIDATES {
-        if let Ok(bytes) = std::fs::read(path)
-            && ttf_parser::Face::parse(&bytes, 0).is_ok()
-        {
-            font_bytes = Some(bytes);
-            break;
-        }
+    if let Some(bytes) = find_system_cjk_font() {
+        install_cjk_font(ctx, bytes);
     }
-
-    let Some(bytes) = font_bytes else {
-        return;
-    };
-
-    let mut fonts = egui::FontDefinitions::default();
-    fonts.font_data.insert("cjk_fallback".to_owned(), Arc::new(egui::FontData::from_owned(bytes)));
-
-    fonts.families.entry(egui::FontFamily::Proportional).or_default().push("cjk_fallback".to_owned());
-
-    fonts.families.entry(egui::FontFamily::Monospace).or_default().push("cjk_fallback".to_owned());
-
-    ctx.set_fonts(fonts);
 }
 
-/// Browsers cannot read system font files. A web host can supply licensed fonts through egui.
+/// On web, setup_fonts does not perform synchronous disk reads.
+/// Use asynchronous loading through [`solvecraft_web`] or host scripts.
 #[cfg(target_arch = "wasm32")]
 pub fn setup_fonts(_ctx: &egui::Context) {}

crates/ui-egui/src/issue_report.rs

@@ -400,7 +400,7 @@ pub(crate) fn tick(app: &mut SolveApp, ctx: &egui::Context) {
 }
 
 pub(crate) fn receive(app: &mut SolveApp, token: u64, image: Arc<ColorImage>) {
-    if !app.issue_report.pending.as_ref().is_some_and(|p| p.token == token) {
+    if app.issue_report.pending.as_ref().is_none_or(|p| p.token != token) {
         return;
     }
     let stale = app.issue_report.pending.as_ref().is_some_and(|p| p.signature != signature(app, app.dialog.as_ref()));

docs/localization.md

@@ -30,9 +30,12 @@ use a render scope that restores the previous locale when it exits, including ne
 Standalone translated panels enter the same scope. Measure rendered text to size custom
 widgets; UTF-8 byte lengths do not describe their displayed width.
 
-The desktop host tries system CJK fonts and skips files that cannot be parsed. No system fonts
-are redistributed. Japanese glyph coverage depends on installed fonts; browser hosts cannot
-load local system fonts and must provide suitably licensed font assets separately.
+The desktop host tries system CJK fonts across Windows, macOS and Linux, as well as an optional
+`CRAFT_FONTS_DIR` font pack, and skips files that cannot be parsed. No system fonts are redistributed.
+Japanese glyph coverage on desktop depends on installed system fonts or craft-fonts. In the browser,
+`solvecraft-web` asynchronously loads a licensed CJK font (trying self-hosted `./fonts/` first, then
+falling back to a public CDN) and installs it into egui once fetched so that localized text renders
+seamlessly without requiring local system font access.
 
 The current messages support named substitution, not locale-specific plural selection,
 number/date formatting, or right-to-left layout and shaping. Add those capabilities when