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feat(web): lazy per-script font loading for international CAD text

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The web build has no system-font access, so CAD text in non-Latin scripts
(Cyrillic, Greek, CJK, …) rendered as nothing — build_fallback was a hard
None on wasm (#141). Instead, ship per-script Noto subsets under web/fonts
(one alphabet per file, SIL OFL 1.1) and fetch them lazily over HTTP the
first time a drawing uses that script, then outline glyphs with ttf-parser.

- web_font: Script enum + script_of (char → script font), a per-script
  store with lazy fetch, and a pending queue drained by the app loop.
- CJK is split by language (chinese/japanese/korean). Han ideographs share
  code points but differ by language, so the shared block is routed by the
  document's $DWGCODEPAGE (932→JP, 949→KR, GB/936→CN); kana is always
  Japanese, Hangul always Korean. Re-tessellates when the language changes.
- build_fallback (wasm) outlines from the fetched subset; clear_fallback_cache
  lets glyphs that missed while a font was in flight reappear on load.
- PollWebFonts subscription (web only) + WebFontLoaded message drive fetches.
- Trunk copy-dir serves web/fonts; nothing is bundled into the native binary
  (desktop keeps using system fonts).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-20 16:13:26 +03:00
commit 54106ca9b0
21 changed files with 453 additions and 5 deletions
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index.html
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@ -42,6 +42,9 @@
<!-- Trunk builds the wasm32 binary without the `solid3d` feature (no 3-D
solid kernel / vtkio C deps on the web). See issue #45. -->
<link data-trunk rel="rust" data-bin="OpenCADStudio" data-cargo-no-default-features />
<!-- Per-script Noto subsets, fetched lazily at runtime (one alphabet per
file) so CAD text renders non-Latin scripts on the web. (#141) -->
<link data-trunk rel="copy-dir" href="web/fonts" />
</head>
<body>
<div id="loading">