364 lines
11 KiB
Dart
364 lines
11 KiB
Dart
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import 'dart:ffi';
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import 'dart:io';
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import 'dart:isolate';
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import 'package:ffi/ffi.dart';
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import 'package:fl_clash/enum/enum.dart';
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import 'package:flutter/foundation.dart' show visibleForTesting;
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import 'package:win32/win32.dart' show GUID;
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import 'print.dart';
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@visibleForTesting
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Future<List<String>> Function() systemFontFamiliesReader = () =>
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Isolate.run(_readSystemFontFamilies);
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/// The font families the engine resolves by name on this host, each listed
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/// through the API the engine itself matches names against.
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Future<List<String>> loadSystemFontFamilies() async {
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try {
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return await systemFontFamiliesReader();
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} catch (e) {
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commonPrint.log('loadSystemFontFamilies: $e', logLevel: LogLevel.warning);
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return const [];
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}
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}
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List<String> _readSystemFontFamilies() {
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return sortFontFamilies(switch (Platform.operatingSystem) {
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'macos' => _coreTextFamilies(),
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'windows' => _directWriteFamilies(),
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'linux' => _fontconfigFamilies(),
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'android' => androidFontFamilies(
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File('/system/etc/fonts.xml').readAsStringSync(),
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),
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_ => const <String>[],
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});
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}
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@visibleForTesting
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List<String> sortFontFamilies(Iterable<String> families) {
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final unique = <String, String>{};
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for (final family in families) {
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final name = family.trim();
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if (name.isEmpty || name.startsWith('.')) {
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continue;
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}
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unique.putIfAbsent(name.toLowerCase(), () => name);
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}
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return unique.values.toList()
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..sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
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}
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@visibleForTesting
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List<String> androidFontFamilies(String fontsXml) => [
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for (final match in RegExp(
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r'<family\b[^>]*\bname="([^"]+)"',
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).allMatches(fontsXml))
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match.group(1)!,
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];
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final class _CFRange extends Struct {
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@IntPtr()
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external int location;
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@IntPtr()
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external int length;
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}
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List<String> _coreTextFamilies() {
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final coreText = DynamicLibrary.open(
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'/System/Library/Frameworks/CoreText.framework/CoreText',
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);
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final coreFoundation = DynamicLibrary.open(
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'/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation',
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);
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final copyFamilyNames = coreText
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.lookupFunction<Pointer<Void> Function(), Pointer<Void> Function()>(
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'CTFontManagerCopyAvailableFontFamilyNames',
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);
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final arrayCount = coreFoundation
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.lookupFunction<
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IntPtr Function(Pointer<Void>),
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int Function(Pointer<Void>)
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>('CFArrayGetCount');
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final arrayValue = coreFoundation
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.lookupFunction<
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Pointer<Void> Function(Pointer<Void>, IntPtr),
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Pointer<Void> Function(Pointer<Void>, int)
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>('CFArrayGetValueAtIndex');
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final stringLength = coreFoundation
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.lookupFunction<
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IntPtr Function(Pointer<Void>),
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int Function(Pointer<Void>)
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>('CFStringGetLength');
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final stringCharacters = coreFoundation
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.lookupFunction<
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Void Function(Pointer<Void>, _CFRange, Pointer<Uint16>),
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void Function(Pointer<Void>, _CFRange, Pointer<Uint16>)
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>('CFStringGetCharacters');
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final release = coreFoundation
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.lookupFunction<
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Void Function(Pointer<Void>),
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void Function(Pointer<Void>)
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>('CFRelease');
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String read(Pointer<Void> string, Arena arena) {
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final length = stringLength(string);
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final range = Struct.create<_CFRange>()
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..location = 0
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..length = length;
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final buffer = arena<Uint16>(length);
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stringCharacters(string, range, buffer);
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return buffer.cast<Utf16>().toDartString(length: length);
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}
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final names = copyFamilyNames();
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try {
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return using(
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(arena) => [
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for (var i = 0; i < arrayCount(names); i++)
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read(arrayValue(names, i), arena),
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],
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);
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} finally {
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release(names);
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}
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}
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extension type const _ComObject(Pointer<Void> pointer) {
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Pointer<NativeFunction<T>> method<T extends Function>(int index) =>
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pointer.cast<Pointer<Pointer<NativeFunction<T>>>>().value[index];
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void release() => method<Uint32 Function(Pointer<Void>)>(
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2,
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).asFunction<int Function(Pointer<Void>)>()(pointer);
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}
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typedef _GetObjectNative =
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Int32 Function(Pointer<Void>, Pointer<Pointer<Void>>);
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typedef _GetObject = int Function(Pointer<Void>, Pointer<Pointer<Void>>);
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typedef _GetIndexedNative =
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Int32 Function(Pointer<Void>, Uint32, Pointer<Pointer<Void>>);
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typedef _GetIndexed = int Function(Pointer<Void>, int, Pointer<Pointer<Void>>);
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const _dwriteFactoryTypeShared = 0;
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const _iidDWriteFactory = '{B859EE5A-D838-4B5B-A2E8-1ADC7D93DB48}';
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void _check(int hresult, String call) {
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if (hresult < 0) {
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throw OSError(call, hresult);
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}
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}
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List<String> _directWriteFamilies() => using((arena) {
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final createFactory = DynamicLibrary.open('dwrite.dll')
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.lookupFunction<
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Int32 Function(Int32, Pointer<GUID>, Pointer<Pointer<Void>>),
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int Function(int, Pointer<GUID>, Pointer<Pointer<Void>>)
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>('DWriteCreateFactory');
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final out = arena<Pointer<Void>>();
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_check(
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createFactory(
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_dwriteFactoryTypeShared,
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GUID(_iidDWriteFactory).toNative(allocator: arena),
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out,
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),
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'DWriteCreateFactory',
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);
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final factory = _ComObject(out.value);
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try {
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_check(
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factory
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.method<Int32 Function(Pointer<Void>, Pointer<Pointer<Void>>, Int32)>(
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3,
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)
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.asFunction<
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int Function(Pointer<Void>, Pointer<Pointer<Void>>, int)
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>()(factory.pointer, out, 0),
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'GetSystemFontCollection',
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);
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final collection = _ComObject(out.value);
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try {
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final count = collection
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.method<Uint32 Function(Pointer<Void>)>(3)
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.asFunction<int Function(Pointer<Void>)>()(collection.pointer);
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final family = collection
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.method<_GetIndexedNative>(4)
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.asFunction<_GetIndexed>();
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return [
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for (var i = 0; i < count; i++)
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if (family(collection.pointer, i, out) >= 0)
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?_directWriteFamilyName(_ComObject(out.value), arena),
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];
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} finally {
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collection.release();
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}
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} finally {
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factory.release();
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}
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});
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String? _directWriteFamilyName(_ComObject family, Arena arena) {
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try {
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final out = arena<Pointer<Void>>();
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final familyNames = family
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.method<_GetObjectNative>(6)
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.asFunction<_GetObject>();
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if (familyNames(family.pointer, out) < 0) {
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return null;
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}
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final names = _ComObject(out.value);
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try {
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final index = arena<Uint32>();
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final exists = arena<Int32>();
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final findLocale = names
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.method<
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Int32 Function(
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Pointer<Void>,
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Pointer<Utf16>,
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Pointer<Uint32>,
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Pointer<Int32>,
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)
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>(4)
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.asFunction<
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int Function(
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Pointer<Void>,
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Pointer<Utf16>,
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Pointer<Uint32>,
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Pointer<Int32>,
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)
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>();
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final found =
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findLocale(
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names.pointer,
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'en-us'.toNativeUtf16(allocator: arena),
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index,
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exists,
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) >=
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0 &&
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exists.value != 0;
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final at = found ? index.value : 0;
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final length = arena<Uint32>();
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final stringLength = names
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.method<Int32 Function(Pointer<Void>, Uint32, Pointer<Uint32>)>(7)
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.asFunction<int Function(Pointer<Void>, int, Pointer<Uint32>)>();
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if (stringLength(names.pointer, at, length) < 0) {
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return null;
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}
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final size = length.value + 1;
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final buffer = arena<Uint16>(size);
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final string = names
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.method<
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Int32 Function(Pointer<Void>, Uint32, Pointer<Uint16>, Uint32)
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>(8)
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.asFunction<int Function(Pointer<Void>, int, Pointer<Uint16>, int)>();
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if (string(names.pointer, at, buffer, size) < 0) {
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return null;
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}
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return buffer.cast<Utf16>().toDartString(length: length.value);
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} finally {
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names.release();
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}
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} finally {
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family.release();
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}
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}
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final class _FcFontSet extends Struct {
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@Int32()
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external int nfont;
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@Int32()
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external int sfont;
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external Pointer<Pointer<Void>> fonts;
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}
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List<String> _fontconfigFamilies() => using((arena) {
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final fontconfig = DynamicLibrary.open('libfontconfig.so.1');
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final createPattern = fontconfig
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.lookupFunction<Pointer<Void> Function(), Pointer<Void> Function()>(
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'FcPatternCreate',
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);
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final addBool = fontconfig
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.lookupFunction<
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Int32 Function(Pointer<Void>, Pointer<Utf8>, Int32),
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int Function(Pointer<Void>, Pointer<Utf8>, int)
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>('FcPatternAddBool');
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final createObjectSet = fontconfig
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.lookupFunction<Pointer<Void> Function(), Pointer<Void> Function()>(
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'FcObjectSetCreate',
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);
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final addObject = fontconfig
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.lookupFunction<
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Int32 Function(Pointer<Void>, Pointer<Utf8>),
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int Function(Pointer<Void>, Pointer<Utf8>)
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>('FcObjectSetAdd');
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final listFonts = fontconfig
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.lookupFunction<
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Pointer<_FcFontSet> Function(
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Pointer<Void>,
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Pointer<Void>,
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Pointer<Void>,
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),
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Pointer<_FcFontSet> Function(
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Pointer<Void>,
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Pointer<Void>,
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Pointer<Void>,
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)
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>('FcFontList');
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final getString = fontconfig
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.lookupFunction<
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Int32 Function(
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Pointer<Void>,
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Pointer<Utf8>,
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Int32,
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Pointer<Pointer<Utf8>>,
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),
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int Function(Pointer<Void>, Pointer<Utf8>, int, Pointer<Pointer<Utf8>>)
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>('FcPatternGetString');
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final destroyFontSet = fontconfig
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.lookupFunction<
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Void Function(Pointer<_FcFontSet>),
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void Function(Pointer<_FcFontSet>)
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>('FcFontSetDestroy');
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final destroyObjectSet = fontconfig
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.lookupFunction<
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Void Function(Pointer<Void>),
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void Function(Pointer<Void>)
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>('FcObjectSetDestroy');
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final destroyPattern = fontconfig
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.lookupFunction<
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Void Function(Pointer<Void>),
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void Function(Pointer<Void>)
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>('FcPatternDestroy');
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final family = 'family'.toNativeUtf8(allocator: arena);
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final pattern = createPattern();
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final objectSet = createObjectSet();
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try {
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addBool(pattern, 'scalable'.toNativeUtf8(allocator: arena), 1);
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addObject(objectSet, family);
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final fontSet = listFonts(nullptr, pattern, objectSet);
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if (fontSet == nullptr) {
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return const <String>[];
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}
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try {
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final value = arena<Pointer<Utf8>>();
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final fonts = fontSet.ref.fonts;
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return [
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for (var i = 0; i < fontSet.ref.nfont; i++)
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if (getString(fonts[i], family, 0, value) == 0)
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value.value.toDartString(),
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];
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} finally {
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destroyFontSet(fontSet);
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}
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} finally {
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destroyObjectSet(objectSet);
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destroyPattern(pattern);
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}
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});
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