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I1231: load Flatpak host fonts for native CJK fallback

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allenyllee
2026-10-14 11:44:01 +08:00
parent 84acf6293b
commit 938097f5b6
3 changed files with 53 additions and 6 deletions
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contributors/people.toml
+3
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@@ -65,3 +65,6 @@ sync_github_name = true
[people.Silvertree2010]
display_name = "Netter"
sync_github_name = false
[people.allenyllee]
sync_github_name = true
crates/ui-egui/src/theme.rs
+43 -3
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@@ -499,9 +499,22 @@ fn fallback_faces(han: HanOrder) -> Vec<(&'static str, Vec<(String, u32)>)> {
/// Linux directories that hold CJK fonts across distributions: Debian/Ubuntu (`opentype/noto`,
/// `truetype/wqy`), Fedora (`google-noto-cjk`), Arch (`noto-cjk`, `wenquanyi`), plus local and
/// flat layouts.
/// flat layouts. Flatpak exposes the same host layouts through read-only font mounts.
#[cfg(not(target_arch = "wasm32"))]
const LINUX_CJK_DIRS: [&str; 10] = [
const LINUX_CJK_DIRS: [&str; 21] = [
// Flatpak mounts host fonts here without a broad filesystem permission. Keep the same
// distribution layouts as below; /usr/share/fonts inside the sandbox belongs to the runtime.
"/run/host/fonts/opentype/noto",
"/run/host/fonts/google-noto-cjk",
"/run/host/fonts/noto-cjk",
"/run/host/fonts/truetype/noto",
"/run/host/fonts/noto",
"/run/host/fonts/truetype",
"/run/host/fonts/TTF",
"/run/host/fonts",
"/run/host/local-fonts",
"/run/host/local-fonts/noto-cjk",
"/run/host/user-fonts",
"/usr/share/fonts/opentype/noto",
"/usr/share/fonts/google-noto-cjk",
"/usr/share/fonts/noto-cjk",
@@ -827,6 +840,33 @@ mod tests {
}
}
#[test]
fn cjk_fallback_probes_flatpak_fonts_with_the_correct_locale_faces() {
// Exercise the candidates the fallback loader actually consumes, not just the directory
// constant. This must work on CI without an installed CJK font or a Flatpak runtime.
for (candidates, face) in [(cjk_han_japanese(), 0), (cjk_han_simplified(), 2), (cjk_hangul(), 1)] {
for directory in [
"/run/host/fonts/opentype/noto",
"/run/host/fonts/google-noto-cjk",
"/run/host/fonts/noto-cjk",
"/run/host/fonts/truetype/noto",
"/run/host/fonts/noto",
"/run/host/fonts/truetype",
"/run/host/fonts/TTF",
"/run/host/fonts",
"/run/host/local-fonts",
"/run/host/local-fonts/noto-cjk",
"/run/host/user-fonts",
] {
let path = format!("{directory}/NotoSansCJK-Regular.ttc");
assert!(candidates.contains(&(path.clone(), face)), "missing Flatpak CJK candidate {path}, face {face}");
}
}
let chinese = cjk_han_simplified();
assert!(chinese.contains(&("/run/host/fonts/truetype/wqy/wqy-microhei.ttc".into(), 0)));
assert!(chinese.contains(&("/run/host/fonts/wenquanyi/wqy-microhei.ttc".into(), 0)));
}
#[test]
fn fallback_faces_load_each_file_once() {
// The region-merged Noto Sans CJK .ttc serves Japanese, Chinese and Hangul; it must be loaded
@@ -850,7 +890,7 @@ mod tests {
// whose face is absent (a minimal machine) and fails if a face is present but not wired in.
let cases: [(&str, Vec<(String, u32)>, &str); 7] = [
("sys-cjk-han-ja", cjk_han_japanese(), "カテゴリ"),
("sys-cjk-han-zh", cjk_han_simplified(), "页面布局 客户端配置"),
("sys-cjk-han-zh", cjk_han_simplified(), "页面布局 客户端配置 繁體中文 儲存與重新開啟 中文標點 ，。！？"),
("sys-cjk-hangul", cjk_hangul(), "한글"),
("sys-thai", thai(), "ทดสอบ"),
("sys-hebrew", hebrew(), "עברית"),
docs/localization-parity.md
+7 -3
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@@ -1,6 +1,6 @@
# Localization parity
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (Format Cells dialog looks its labels up in the catalog) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (CJK fallback probes Flatpak host font mounts) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
Per-language status against Excel, which ships its UI in dozens of languages (Windows language
packs cover 100+), with localized function names, argument separators, number and date formats,
@@ -26,8 +26,11 @@ right-to-left sheets and full complex-script support. Part of
localized function names and `;` separators (#45). German with localized numbers and formulas
is in PR #163 (open).
- **Script support.** System-font fallback for CJK, Thai and Hebrew landed in #38 (closes #32;
#142 is still open pending confirmation). There is no complex-text shaping: Arabic and
Devanagari don't join or reorder, and there is no bidirectional layout. **Sheet Right-to-Left**
#142 is still open pending confirmation). Native CJK fallback also probes Flatpak's read-only
`/run/host/fonts`, `/run/host/local-fonts` and `/run/host/user-fonts` layouts, so installed
Noto CJK and WenQuanYi faces can render Chinese without a broad filesystem grant. This does
not change the installed-font catalogue or add bundled fonts. There is no complex-text shaping:
Arabic and Devanagari don't join or reorder, and there is no bidirectional layout. **Sheet Right-to-Left**
(`view.rightToLeft`, Page Layout › Sheet Options, XLSX `rightToLeft`) mirrors the grid (#146):
column A and the row headers on the right, the vertical scrollbar on the left; hit-testing,
arrow keys, editor, popups and floating objects follow; text stays left-to-right inside its box
@@ -78,6 +81,7 @@ language (none so far) and of localized function names.
| Date | Change | Summary |
|---|---|---|
| 2026-10-14 | minor | CJK fallback probes the read-only Flatpak host font mounts with the existing distribution layouts and TTC locale indices; no new sandbox permissions or bundled fonts |
| 2026-10-12 | minor | Format Cells looks up its tabs, labels, options and note through `Language::tr` (Fill tab keyed `Format Cells\|Fill`); dialog titles and OK/Cancel too. Labels already in a table (Number, Currency, Fill…) show translated; the rest fall back to English until the tables add them |
| 2026-10-12 | minor | Brazilian Portuguese catalog (`i18n/pt.rs`) grows from 377 to 923 entries: every key the other catalogs translate, including the dialog strings #669 starts looking up (~42%) |
| 2026-10-11 | minor | German ribbon catalog (`i18n/de.rs`, 266 labels, ~12%); `de` locale tags (de-DE, de-AT, de-CH…) resolve to German. PR #163 (localized German formulas/numbers) still open |