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Fonts: use craft-fonts as an optional build input; move the Japanese fonts out

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The Japanese fonts (BIZ UDPGothic Regular/Bold for the UI, BIZ UDMincho for text
watermarks; #110, #114) now come from storytold/craft-fonts instead of assets/fonts/.

- crates/engine/build.rs: the craft-fonts recipe. With CRAFT_FONTS_DIR set it embeds
  the manifest's fonts as lightcraft_engine::CRAFT_FONTS (wasm32: BIZ UDPGothic Regular
  only, for the web size budget); unset, CRAFT_FONTS is empty. Local files only, no
  network; craft-fonts is not in any Cargo.toml.
- UI: theme::font_definitions adds the Japanese faces after Inter and egui's defaults
  in every family (BIZ UDPGothic first, Bold first for semibold). About box lists the
  embedded families.
- Watermarks: Inter, then the craft-fonts Japanese faces (Mincho first).
- Removed BIZUDPGothic-Regular/Bold.ttf, BIZUDMincho-Regular.ttf and their OFL files,
  and their ATTRIBUTION rows; added an attribution row for craft-fonts as an optional
  build input; NOTICE updated.
- Tests: Japanese glyph tests use CRAFT_FONTS and skip without it; new tests for
  Japanese in the UI with craft-fonts and for the UI and watermarks without it.
- CI: the FreeBSD job builds/tests with craft-fonts. Releases check out craft-fonts at
  a pinned commit, build with CRAFT_FONTS_DIR + CRAFT_FONTS_REQUIRED=1, and ship the
  fonts' OFL licences (plus NOTICE) in every package.
- Docs: AGENTS.md, CLAUDE.md, README, docs/web.md, docs/localization-ja.md, ROADMAP,
  parity.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Brandon Thomas
2026-10-06 11:35:02 -04:00
co-authored by Claude Opus 5.5
parent 8bef0b1ef3
commit 2aa236537f
27 changed files with 429 additions and 250 deletions
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docs/web.md
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@@ -52,6 +52,14 @@ codecs) at opt-level 3 and the rest (egui, eframe, serde, glue) at "s". What goe
is the brotli column: 3.1 MB, 11 % less than the old build's brotli size and 41 % less than its
gzip size (5.25 MB). `wasm-opt -Oz`, when installed, shrinks it further.
**Fonts.** The browser has no system fonts to fall back on, so Japanese text comes from
[craft-fonts](https://github.com/storytold/craft-fonts), the optional `CRAFT_FONTS_DIR` build
input (`CRAFT_FONTS_DIR=../craft-fonts cargo xtask web`; release builds always set it). On wasm32
`crates/engine/build.rs` embeds only BIZ UDPGothic Regular (UI, and the watermark fallback), so
the module stays well under Cloudflare's 25 MiB per-file limit: measured 2026-10-06, 17.1 MB
without craft-fonts and 21.8 MB with it (brotli 3.8 MB / 6.3 MB). Without it the web build
works, but Japanese text has no glyphs.
## Deploying: headers
`cargo xtask web --serve` sends these on every response. A production server may send them too;