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Revert "fix(arm64-linux): fix CJK font rendering on flutter-elinux (#15324)" (#15377)

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This reverts commit c9391fb894.
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RustDesk
2026-06-22 13:40:39 +08:00
committed by GitHub
parent 3c574a4182
commit 2747d3d8b4
4 changed files with 0 additions and 155 deletions
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109
flutter/lib/native/font_manager.dart
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@@ -1,109 +0,0 @@
import 'dart:ffi' show Abi;
import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
/// Font family name registered with [FontLoader] when a system CJK font is
/// successfully loaded on ARM64 Linux.
const kLinuxCjkFontFamily = 'SystemCJK';
const _kFontSearchPaths = [
// Debian / Ubuntu (noto-fonts / fonts-noto-cjk)
'/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc',
'/usr/share/fonts/truetype/noto/NotoSansCJK-Regular.ttc',
'/usr/share/fonts/opentype/noto/NotoSansCJKsc-Regular.otf',
// Fedora / RHEL / Rocky (google-noto-sans-cjk-fonts)
'/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc',
'/usr/share/fonts/google-noto-sans-cjk-fonts/NotoSansCJK-Regular.ttc',
// Arch Linux (noto-fonts-cjk)
'/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc',
'/usr/share/fonts/noto-cjk/NotoSansCJKsc-Regular.otf',
// Generic fallback paths
'/usr/share/fonts/noto/NotoSansCJK-Regular.ttc',
'/usr/share/fonts/noto/NotoSansCJKsc-Regular.otf',
// WenQuanYi — commonly pre-installed on CJK-locale systems
'/usr/share/fonts/truetype/wqy/wqy-microhei.ttc',
'/usr/share/fonts/truetype/wqy/wqy-zenhei.ttc',
'/usr/share/fonts/wqy-microhei/wqy-microhei.ttc',
'/usr/share/fonts/wqy-zenhei/wqy-zenhei.ttc',
];
/// Loads a system CJK font on ARM64 Linux into Flutter's font registry via
/// [FontLoader], working around the missing fontconfig support in the
/// flutter-elinux engine (https://github.com/flutter/flutter/issues/139293).
///
/// Returns true if a CJK font was successfully loaded; false otherwise.
/// On all other platforms this is a no-op and returns false immediately.
Future<bool> loadSystemCJKFonts() async {
if (Abi.current() != Abi.linuxArm64) return false;
final path = await _findCjkFontPath();
if (path == null) {
debugPrint('ARM64 Linux: no CJK font found; CJK text may not render');
return false;
}
try {
final loader = FontLoader(kLinuxCjkFontFamily);
final bytes = await File(path).readAsBytes();
loader.addFont(Future.value(ByteData.view(bytes.buffer, bytes.offsetInBytes, bytes.lengthInBytes)));
await loader.load();
debugPrint('ARM64 Linux: loaded CJK font from $path');
return true;
} catch (e) {
debugPrint('ARM64 Linux: failed to load CJK font: $e');
return false;
}
}
Future<String?> _findCjkFontPath() async {
// Query fc-list for each CJK script separately. Fonts present in all three
// sets (zh ∩ ja ∩ ko) are true pan-CJK fonts; prefer them so we don't
// accidentally pick a Chinese-only font that lacks Japanese kana or Korean
// hangul glyphs. fc-list is a fontconfig CLI tool available on most Linux
// systems independent of whether the Flutter engine was built with fontconfig.
final byLang = <String, Set<String>>{};
for (final lang in const ['zh', 'ja', 'ko']) {
final paths = <String>{};
try {
final r =
await Process.run('fc-list', [':lang=$lang', '--format=%{file}\n']);
if (r.exitCode == 0) {
for (final line in r.stdout.toString().split('\n')) {
final p = line.trim();
if (p.isNotEmpty && File(p).existsSync()) paths.add(p);
}
}
} catch (e) {
debugPrint('ARM64 Linux: fc-list failed for lang=$lang: $e');
}
byLang[lang] = paths;
}
final panCjk = byLang['zh']!
.intersection(byLang['ja']!)
.intersection(byLang['ko']!);
final anyCjk =
byLang.values.fold(<String>{}, (acc, s) => acc..addAll(s));
// Among candidates, prefer well-known pan-CJK font families.
String? pick(Iterable<String> pool) {
const preferred = ['notosanscjk', 'sourcehansans', 'sourcehanserif'];
for (final name in preferred) {
for (final p in pool) {
if (p.toLowerCase().contains(name)) return p;
}
}
return pool.isNotEmpty ? pool.first : null;
}
final found = pick(panCjk) ?? pick(anyCjk);
if (found != null) return found;
for (final p in _kFontSearchPaths) {
if (File(p).existsSync()) return p;
}
return null;
}