feat(web): self-host Japanese font and load on-demand without external CDN

- Bundle BIZ UDPGothic Regular (SIL OFL 1.1) exclusively in solvecraft-web dist

- Remove external jsDelivr CDN fallback; fetch font solely from same-origin ./fonts/

- Fetch Japanese font on-demand only when UI language is set to Japanese

- Gracefully fall back to English UI on fetch failure to prevent tofu glyphs

- Update ATTRIBUTION.md, NOTICE, and THIRD-PARTY-LICENSES.txt

ATTRIBUTION.md

@@ -26,6 +26,7 @@ Generated-in-code assets are original and have no file to list:
 | docs/book/src/generated/revolve.png | SolveCraft contributors | rendered by `cargo xtask book` (`solvecraft-cli snapshot docs/book/scripts/revolve.json`; gitignored) | MIT OR Apache-2.0 |
 | docs/book/src/generated/sheet-metal.png | SolveCraft contributors | rendered by `cargo xtask book` (`solvecraft-cli snapshot docs/book/scripts/sheet-metal.json`; gitignored) | MIT OR Apache-2.0 |
 | crates/sketch/fonts/LiberationSans-Regular.ttf | Red Hat, Inc. (Liberation Fonts 2.x; digitized data Google) | https://github.com/liberationfonts (Debian fonts-liberation), unmodified; licence text in crates/sketch/fonts/OFL.txt; used for sketch Text outlines | SIL OFL 1.1 |
+| apps/solvecraft-web/fonts/BIZUDPGothic-Regular.ttf | The BIZ UDGothic Project Authors | https://github.com/googlefonts/morisawa-biz-ud-gothic (Google Fonts), unmodified; licence text in apps/solvecraft-web/fonts/OFL.txt; used for web UI Japanese font | SIL OFL 1.1 |
 
 ## Code adapted from sibling projects
 

NOTICE

@@ -19,8 +19,9 @@ licensed MIT OR Apache-2.0; ATTRIBUTION.md lists the files.
 The release packaging (.github/workflows/release.yml, packaging/) is adapted from PhotoCraft
 (https://github.com/storytold/photocraft), licensed under the Apache License 2.0.
 
-None of the bundled assets come from third parties: every icon is drawn in code. The per-file
+Most bundled assets are drawn in code or contributed originally; third-party fonts (Liberation Sans
-list is in ATTRIBUTION.md.
+for sketch text, BIZ UDPGothic for web Japanese display) are licensed under SIL OFL 1.1. The
+per-file list is in ATTRIBUTION.md.
 
 SolveCraft is an independent project and is not affiliated with, sponsored by or endorsed by
 Autodesk, Inc. Autodesk and Fusion are trademarks of Autodesk, Inc.; they are used here only to

THIRD-PARTY-LICENSES.txt

@@ -13345,3 +13345,113 @@ truck-geotrait 0.4.0: Apache-2.0 (https://github.com/ricosjp/truck)
 truck-modeling 0.6.0: Apache-2.0 (https://github.com/ricosjp/truck)
 truck-polymesh 0.6.0: Apache-2.0 (https://github.com/ricosjp/truck)
 truck-topology 0.6.0: Apache-2.0 (https://github.com/ricosjp/truck)
+
+================================================================================
+Bundled fonts (SIL Open Font License, Version 1.1)
+================================================================================
+
+- LiberationSans-Regular.ttf (crates/sketch/fonts/LiberationSans-Regular.ttf)
+  Copyright 2012 Red Hat, Inc. (Liberation Fonts 2.x; digitized data Google)
+  Source: https://github.com/liberationfonts
+
+- BIZUDPGothic-Regular.ttf (apps/solvecraft-web/fonts/BIZUDPGothic-Regular.ttf)
+  Copyright 2022 The BIZ UDGothic Project Authors (https://github.com/googlefonts/morisawa-biz-ud-mincho)
+  Source: https://github.com/googlefonts/morisawa-biz-ud-gothic
+
+================================================================================
+SIL OPEN FONT LICENSE Version 1.1
+================================================================================
+
+Copyright 2022 The BIZ UDGothic Project Authors (https://github.com/googlefonts/morisawa-biz-ud-mincho)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

apps/solvecraft-web/fonts/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2022 The BIZ UDGothic Project Authors (https://github.com/googlefonts/morisawa-biz-ud-mincho)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

apps/solvecraft-web/index.html

@@ -5,6 +5,8 @@
   <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
   <title>SolidCraft</title>
   <link data-trunk rel="rust" data-bin="solvecraft-web" data-wasm-opt="z" data-weak-refs />
+  <link data-trunk rel="copy-file" href="fonts/BIZUDPGothic-Regular.ttf" data-target-path="fonts" />
+  <link data-trunk rel="copy-file" href="fonts/OFL.txt" data-target-path="fonts" />
   <style>
     html, body { margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background: #e8ebf0; }
     #solvecraft_canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

apps/solvecraft-web/src/main.rs

@@ -46,6 +46,18 @@ mod web {
         on_unload.forget();
     }
 
+    const JAPANESE_FONT_PATH: &str = "./fonts/BIZUDPGothic-Regular.ttf";
+
+    #[derive(Clone, Copy, Debug, PartialEq, Eq)]
+    enum FontStatus {
+        Unloaded,
+        Loading,
+        Installed,
+        Failed,
+    }
+
+    type FontLoadResult = Rc<std::cell::RefCell<Option<Result<Vec<u8>, String>>>>;
+
     struct Shell {
         app: SolveApp,
         files: Rc<Files>,
@@ -58,6 +70,8 @@ mod web {
         rename_focus: bool,
         /// The start page's recent designs were filled from the stored ones.
         recents_synced: bool,
+        font_status: FontStatus,
+        font_result: FontLoadResult,
     }
 
     impl Shell {
@@ -304,10 +318,59 @@ mod web {
             }
             files::autosave(&self.files, None);
         }
+
+        /// Check language preference and manage on-demand Japanese font loading.
+        fn tick_font(&mut self, ctx: &egui::Context) {
+            if self.font_status == FontStatus::Loading {
+                if let Some(res) = self.font_result.borrow_mut().take() {
+                    match res {
+                        Ok(bytes) => {
+                            if solvecraft_ui_egui::fonts::install_cjk_font(ctx, bytes) {
+                                log::info!("loaded web Japanese font from {JAPANESE_FONT_PATH}");
+                                self.font_status = FontStatus::Installed;
+                                ctx.request_repaint();
+                            } else {
+                                log::warn!("failed to install Japanese font: invalid font data; falling back to English");
+                                self.font_status = FontStatus::Failed;
+                                self.app.preferences.language = "en".to_string();
+                                ctx.request_repaint();
+                            }
+                        }
+                        Err(err) => {
+                            log::warn!("failed to fetch Japanese font from {JAPANESE_FONT_PATH}: {err}; falling back to English");
+                            self.font_status = FontStatus::Failed;
+                            self.app.preferences.language = "en".to_string();
+                            ctx.request_repaint();
+                        }
+                    }
+                }
+            }
+
+            if self.app.preferences.language == "ja" {
+                match self.font_status {
+                    FontStatus::Unloaded => {
+                        self.font_status = FontStatus::Loading;
+                        let slot = self.font_result.clone();
+                        let ctx_clone = ctx.clone();
+                        wasm_bindgen_futures::spawn_local(async move {
+                            let res = fetch_font_bytes(JAPANESE_FONT_PATH).await;
+                            *slot.borrow_mut() = Some(res);
+                            ctx_clone.request_repaint();
+                        });
+                    }
+                    FontStatus::Failed => {
+                        // Prevent tofu glyphs if font loading failed
+                        self.app.preferences.language = "en".to_string();
+                    }
+                    FontStatus::Loading | FontStatus::Installed => {}
+                }
+            }
+        }
     }
 
     impl eframe::App for Shell {
         fn logic(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+            self.tick_font(ctx);
             self.app.logic(ctx);
             self.files_tick(ctx);
             UNSAVED.with(|u| u.set(solvecraft_ui_egui::documents::any_dirty(&self.app)));
@@ -347,32 +410,6 @@ mod web {
         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 {
@@ -395,7 +432,6 @@ mod web {
                     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();
@@ -439,6 +475,8 @@ mod web {
                             renaming: None,
                             rename_focus: false,
                             recents_synced: false,
+                            font_status: FontStatus::Unloaded,
+                            font_result: Rc::new(std::cell::RefCell::new(None)),
                         }))
                     }),
                 )

docs/localization.md

@@ -31,11 +31,16 @@ Standalone translated panels enter the same scope. Measure rendered text to size
 widgets; UTF-8 byte lengths do not describe their displayed width.
 
 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.
+`CRAFT_FONTS_DIR` font pack, and skips files that cannot be parsed. No fonts are redistributed
-Japanese glyph coverage on desktop depends on installed system fonts or craft-fonts. In the browser,
+in native desktop distribution packages; native builds rely entirely on existing operating system fonts
-`solvecraft-web` asynchronously loads a licensed CJK font (trying self-hosted `./fonts/` first, then
+or craft-fonts.
-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.
+In the browser, `solvecraft-web` bundles a self-hosted Japanese font (`BIZUDPGothic-Regular.ttf`, licensed
+under SIL OFL 1.1) within the web distribution artifacts only. The font is loaded asynchronously from the same
+origin (`./fonts/BIZUDPGothic-Regular.ttf`) on-demand when the interface language is set to Japanese, without
+contacting any external CDNs or third-party servers. For users with an English interface, no font download
+occurs. If font loading fails, the web interface gracefully falls back to English to prevent missing glyphs
+(tofu). This bundled font specifically targets Japanese; Korean (Hangul) and Chinese scripts are not covered.
 
 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

xtask/src/licences.rs

@@ -88,8 +88,7 @@ fn generate(root: &Path) -> Result<String, String> {
         });
     }
     crates.sort_by(|a, b| (&a.name, &a.version).cmp(&(&b.name, &b.version)));
-    let _ = root;
+    Ok(render(root, &crates))
-    Ok(render(&crates))
 }
 
 /// The licence and notice files at the top of a crate's package (and its `license-file`).
@@ -117,7 +116,7 @@ fn licence_files(dir: &Path, p: &Value) -> Vec<(String, String)> {
         .collect()
 }
 
-fn render(crates: &[Crate]) -> String {
+fn render(root: &Path, crates: &[Crate]) -> String {
     let rule = "=".repeat(80);
     let mut out = format!(
         "Third-party software in SolidCraft\n\nSolidCraft (the desktop app, solvecraft-cli and the web app) is built from the {} crates below.\n\
@@ -158,6 +157,26 @@ fn render(crates: &[Crate]) -> String {
             );
         }
     }
+
+    // Bundled font licences (SIL Open Font License, Version 1.1)
+    let font_rule = "=".repeat(80);
+    out += &format!(
+        "\n{font_rule}\nBundled fonts (SIL Open Font License, Version 1.1)\n{font_rule}\n\n\
+         - LiberationSans-Regular.ttf (crates/sketch/fonts/LiberationSans-Regular.ttf)\n  \
+           Copyright 2012 Red Hat, Inc. (Liberation Fonts 2.x; digitized data Google)\n  \
+           Source: https://github.com/liberationfonts\n\n\
+         - BIZUDPGothic-Regular.ttf (apps/solvecraft-web/fonts/BIZUDPGothic-Regular.ttf)\n  \
+           Copyright 2022 The BIZ UDGothic Project Authors (https://github.com/googlefonts/morisawa-biz-ud-mincho)\n  \
+           Source: https://github.com/googlefonts/morisawa-biz-ud-gothic\n\n"
+    );
+    let ofl_path = root.join("apps/solvecraft-web/fonts/OFL.txt");
+    let fallback_path = root.join("crates/sketch/fonts/OFL.txt");
+    let ofl_text = std::fs::read_to_string(&ofl_path).or_else(|_| std::fs::read_to_string(&fallback_path)).unwrap_or_default();
+    let ofl_clean = ofl_text.replace("\r\n", "\n").trim().to_string();
+    if !ofl_clean.is_empty() {
+        out += &format!("{font_rule}\nSIL OPEN FONT LICENSE Version 1.1\n{font_rule}\n\n{ofl_clean}\n");
+    }
+
     out
 }