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integration.md: embed only the UI font in web (wasm32) builds

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All four fonts are ~24 MB, over typical per-file hosting limits (Cloudflare
25 MiB); the recipe now embeds only BIZ UDPGothic Regular on wasm32.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Brandon Thomas
2026-10-06 10:11:59 -04:00
co-authored by Claude Opus 5.5
parent abb83316d9
commit abbfddb426
1 changed files with 9 additions and 0 deletions
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docs/integration.md
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@@ -62,12 +62,18 @@ fn craft_fonts(dir: &std::path::Path) -> Result<String, String> {
let manifest = dir.join("fonts/manifest.txt");
println!("cargo::rerun-if-changed={}", manifest.display());
let text = std::fs::read_to_string(&manifest).map_err(|e| format!("{}: {e}", manifest.display()))?;
// Web builds have a size budget (e.g. Cloudflare's 25 MiB per file): embed only the UI font there.
const WEB_FONTS: &[(&str, &str)] = &[("BIZ UDPGothic", "Regular")];
let wasm = std::env::var("CARGO_CFG_TARGET_ARCH").is_ok_and(|a| a == "wasm32");
let mut out = String::new();
for line in text.lines().map(str::trim).filter(|l| !l.is_empty() && !l.starts_with('#')) {
let f: Vec<&str> = line.split(" | ").map(str::trim).collect();
let [family, style, file, scripts, ..] = f.as_slice() else {
return Err(format!("malformed manifest line: {line}"));
};
if wasm && !WEB_FONTS.contains(&(*family, *style)) {
continue;
}
let path = dir.join(file).canonicalize().map_err(|e| format!("{file}: {e}"))?;
println!("cargo::rerun-if-changed={}", path.display());
let scripts: Vec<String> = scripts.split(',').map(|s| format!("{:?}", s.trim())).collect();
@@ -107,6 +113,9 @@ app was built without craft-fonts. Code that uses it must work when it is empty.
the app was built with craft-fonts.
- **Document text engines:** register them as fallback faces for Japanese, after the document's
requested font and the app's bundled fonts.
- **Web (wasm32):** the recipe embeds only `BIZ UDPGothic Regular` (~4.5 MB); all four fonts are
~24 MB, over typical per-file hosting limits. If the app's web build has a size check, measure
with `CRAFT_FONTS_DIR` set and shrink `WEB_FONTS` (even to empty) if it fails.
- Prefer `BIZ UDPGothic` for UI text and `Shippori Mincho` / `BIZ UDMincho` for serif document
text.
- Tests that assert on these fonts' glyphs must skip (not fail) when `CRAFT_FONTS` is empty, and