FullscreenUI: Allow changing UI language

scripts/generate_update_fa_glyph_ranges.py

@@ -81,7 +81,7 @@ def get_pairs(tokens):
 with open(dst_file, "r") as f:
     original = f.read()
     updated = re.sub(out_pattern, "\\1 " + get_pairs(tokens) + " \\2", original)
-    updated = re.sub(out_pf_pattern, "\\1 " + get_pairs(pf_tokens) + " \\2", original)
+    updated = re.sub(out_pf_pattern, "\\1 " + get_pairs(pf_tokens) + " \\2", updated)
     if original != updated:
         with open(dst_file, "w") as f:
             f.write(updated)

src/core/fullscreen_ui.cpp

@@ -2795,6 +2795,34 @@ void FullscreenUI::DrawInterfaceSettingsPage()
     ImGuiFullscreen::SetTheme(bsi->GetBoolValue("Main", "UseLightFullscreenUITheme", false));
   }
 
+  {
+    // Have to do this the annoying way, because it's host-derived.
+    const auto language_list = Host::GetAvailableLanguageList();
+    std::string current_language = bsi->GetStringValue("Main", "Language", "");
+    const char* current_language_name = "Unknown";
+    for (const auto& [language, code] : language_list)
+    {
+      if (current_language == code)
+        current_language_name = language;
+    }
+    if (MenuButtonWithValue(FSUI_ICONSTR(ICON_FA_LANGUAGE, "UI Language"),
+                            FSUI_CSTR("Chooses the language used for UI elements."), current_language_name))
+    {
+      ImGuiFullscreen::ChoiceDialogOptions options;
+      for (const auto& [language, code] : language_list)
+        options.emplace_back(fmt::format("{} [{}]", language, code), (current_language == code));
+      OpenChoiceDialog(FSUI_ICONSTR(ICON_FA_LANGUAGE, "UI Language"), false, std::move(options),
+                       [language_list](s32 index, const std::string& title, bool checked) {
+                         if (static_cast<u32>(index) >= language_list.size())
+                           return;
+
+                         ImGuiFullscreen::CloseChoiceDialog();
+                         Host::RunOnCPUThread(
+                           [language = language_list[index].second]() { Host::ChangeLanguage(language); });
+                       });
+    }
+  }
+
 #ifdef ENABLE_DISCORD_PRESENCE
   MenuHeading(FSUI_CSTR("Integration"));
   DrawToggleSetting(bsi, FSUI_ICONSTR(ICON_FA_CHARGING_STATION, "Enable Discord Presence"),
@@ -6777,6 +6805,7 @@ TRANSLATE_NOOP("FullscreenUI", "Change settings for the emulator.");
 TRANSLATE_NOOP("FullscreenUI", "Changes the aspect ratio used to display the console's output to the screen.");
 TRANSLATE_NOOP("FullscreenUI", "Cheat List");
 TRANSLATE_NOOP("FullscreenUI", "Chooses the backend to use for rendering the console/game visuals.");
+TRANSLATE_NOOP("FullscreenUI", "Chooses the language used for UI elements.");
 TRANSLATE_NOOP("FullscreenUI", "Chroma Smoothing For 24-Bit Display");
 TRANSLATE_NOOP("FullscreenUI", "Clean Boot");
 TRANSLATE_NOOP("FullscreenUI", "Clear Settings");
@@ -7218,6 +7247,7 @@ TRANSLATE_NOOP("FullscreenUI", "Toggle every %d frames");
 TRANSLATE_NOOP("FullscreenUI", "True Color Rendering");
 TRANSLATE_NOOP("FullscreenUI", "Turbo Speed");
 TRANSLATE_NOOP("FullscreenUI", "Type");
+TRANSLATE_NOOP("FullscreenUI", "UI Language");
 TRANSLATE_NOOP("FullscreenUI", "Undo Load State");
 TRANSLATE_NOOP("FullscreenUI", "Unknown");
 TRANSLATE_NOOP("FullscreenUI", "Unlimited");

src/core/host.h

@@ -75,6 +75,12 @@ std::unique_ptr<AudioStream> CreateAudioStream(AudioBackend backend, u32 sample_
 void ReportDebuggerMessage(const std::string_view& message);
 void ReportFormattedDebuggerMessage(const char* format, ...);
 
+/// Returns a list of supported languages and codes (suffixes for translation files).
+std::span<const std::pair<const char*, const char*>> GetAvailableLanguageList();
+
+/// Refreshes the UI when the language is changed.
+bool ChangeLanguage(const char* new_language);
+
 /// Displays a loading screen with the logo, rendered with ImGui. Use when executing possibly-time-consuming tasks
 /// such as compiling shaders when starting up.
 void DisplayLoadingScreen(const char* message, int progress_min = -1, int progress_max = -1, int progress_value = -1);

src/duckstation-nogui/nogui_host.cpp

@@ -322,6 +322,16 @@ void Host::ReportDebuggerMessage(const std::string_view& message)
   Log_ErrorPrintf("ReportDebuggerMessage: %.*s", static_cast<int>(message.size()), message.data());
 }
 
+std::span<const std::pair<const char*, const char*>> Host::GetAvailableLanguageList()
+{
+  return {};
+}
+
+bool Host::ChangeLanguage(const char* new_language)
+{
+  return false;
+}
+
 void Host::AddFixedInputBindings(SettingsInterface& si)
 {
 }

src/duckstation-qt/mainwindow.cpp

@@ -1648,32 +1648,29 @@ void MainWindow::setupAdditionalUi()
   }
   updateDebugMenuCropMode();
 
-  const QString current_language(QString::fromStdString(Host::GetBaseStringSettingValue("Main", "Language", "")));
+  const std::string current_language = Host::GetBaseStringSettingValue("Main", "Language", "");
   QActionGroup* language_group = new QActionGroup(m_ui.menuSettingsLanguage);
-  for (const std::pair<QString, QString>& it : QtHost::GetAvailableLanguageList())
+  for (const auto& [language, code] : Host::GetAvailableLanguageList())
   {
-    QAction* action = language_group->addAction(it.first);
+    QAction* action = language_group->addAction(QString::fromUtf8(language));
     action->setCheckable(true);
-    action->setChecked(current_language == it.second);
+    action->setChecked(current_language == code);
 
-    QString icon_filename(QStringLiteral(":/icons/flags/%1.png").arg(it.second));
+    QString icon_filename(QStringLiteral(":/icons/flags/%1.png").arg(QLatin1StringView(code)));
     if (!QFile::exists(icon_filename))
     {
       // try without the suffix (e.g. es-es -> es)
-      const int pos = it.second.lastIndexOf('-');
-      if (pos >= 0)
-        icon_filename = QStringLiteral(":/icons/flags/%1.png").arg(it.second.left(pos));
+      const char* pos = std::strrchr(code, '-');
+      if (pos)
+        icon_filename = QStringLiteral(":/icons/flags/%1.png").arg(QLatin1StringView(pos));
     }
     action->setIcon(QIcon(icon_filename));
 
     m_ui.menuSettingsLanguage->addAction(action);
-    action->setData(it.second);
+    action->setData(QString::fromLatin1(code));
     connect(action, &QAction::triggered, [this, action]() {
       const QString new_language = action->data().toString();
-      Host::SetBaseStringSettingValue("Main", "Language", new_language.toUtf8().constData());
-      Host::CommitBaseSettingChanges();
-      QtHost::InstallTranslator();
-      recreate();
+      Host::ChangeLanguage(new_language.toUtf8().constData());
     });
   }
 

src/duckstation-qt/mainwindow.h

@@ -107,6 +107,7 @@ public Q_SLOTS:
   std::optional<WindowInfo> getWindowInfo();
 
   void checkForUpdates(bool display_message);
+  void recreate();
 
   void* getNativeWindowId();
 
@@ -242,7 +243,6 @@ private:
   void setTheme(const QString& theme);
   void updateTheme();
   void reloadThemeSpecificImages();
-  void recreate();
   void destroySubWindows();
 
   void registerForDeviceNotifications();

src/duckstation-qt/qthost.h

@@ -253,9 +253,6 @@ bool InNoGUIMode();
 /// Executes a function on the UI thread.
 void RunOnUIThread(const std::function<void()>& func, bool block = false);
 
-/// Returns a list of supported languages and codes (suffixes for translation files).
-std::vector<std::pair<QString, QString>> GetAvailableLanguageList();
-
 /// Default language for the platform.
 const char* GetDefaultLanguage();
 

src/duckstation-qt/qttranslations.cpp

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: 2019-2023 Connor McLaughlin <stenzek@gmail.com> and contributors.
 // SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
 
+#include "mainwindow.h"
 #include "qthost.h"
 
 #include "core/host.h"
@@ -202,24 +203,37 @@ static std::string QtHost::GetFontPath(const GlyphInfo* gi)
   return font_path;
 }
 
-std::vector<std::pair<QString, QString>> QtHost::GetAvailableLanguageList()
+std::span<const std::pair<const char*, const char*>> Host::GetAvailableLanguageList()
 {
-  return {{QStringLiteral("English"), QStringLiteral("en")},
-          {QStringLiteral("Deutsch"), QStringLiteral("de")},
-          {QStringLiteral("Español de Latinoamérica"), QStringLiteral("es")},
-          {QStringLiteral("Español de España"), QStringLiteral("es-ES")},
-          {QStringLiteral("Français"), QStringLiteral("fr")},
-          {QStringLiteral("עברית"), QStringLiteral("he")},
-          {QStringLiteral("日本語"), QStringLiteral("ja")},
-          {QStringLiteral("한국어"), QStringLiteral("ko")},
-          {QStringLiteral("Italiano"), QStringLiteral("it")},
-          {QStringLiteral("Nederlands"), QStringLiteral("nl")},
-          {QStringLiteral("Polski"), QStringLiteral("pl")},
-          {QStringLiteral("Português (Pt)"), QStringLiteral("pt-PT")},
-          {QStringLiteral("Português (Br)"), QStringLiteral("pt-BR")},
-          {QStringLiteral("Русский"), QStringLiteral("ru")},
-          {QStringLiteral("Türkçe"), QStringLiteral("tr")},
-          {QStringLiteral("简体中文"), QStringLiteral("zh-CN")}};
+  static constexpr const std::pair<const char*, const char*> languages[] = {{"English", "en"},
+                                                                            {"Deutsch", "de"},
+                                                                            {"Español de Latinoamérica", "es"},
+                                                                            {"Español de España", "es-ES"},
+                                                                            {"Français", "fr"},
+                                                                            {"עברית", "he"},
+                                                                            {"日本語", "ja"},
+                                                                            {"한국어", "ko"},
+                                                                            {"Italiano", "it"},
+                                                                            {"Nederlands", "nl"},
+                                                                            {"Polski", "pl"},
+                                                                            {"Português (Pt)", "pt-PT"},
+                                                                            {"Português (Br)", "pt-BR"},
+                                                                            {"Русский", "ru"},
+                                                                            {"Türkçe", "tr"},
+                                                                            {"简体中文", "zh-CN"}};
+
+  return languages;
+}
+
+bool Host::ChangeLanguage(const char* new_language)
+{
+  QtHost::RunOnUIThread([new_language = std::string(new_language)]() {
+    Host::SetBaseStringSettingValue("Main", "Language", new_language.c_str());
+    Host::CommitBaseSettingChanges();
+    QtHost::InstallTranslator();
+    g_main_window->recreate();
+  });
+  return true;
 }
 
 const char* QtHost::GetDefaultLanguage()

src/duckstation-qt/setupwizarddialog.cpp

@@ -186,8 +186,8 @@ void SetupWizardDialog::setupLanguagePage()
                                                GeneralSettingsWidget::DEFAULT_THEME_NAME, "InterfaceSettingsWidget");
   connect(m_ui.theme, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &SetupWizardDialog::themeChanged);
 
-  for (const std::pair<QString, QString>& it : QtHost::GetAvailableLanguageList())
-    m_ui.language->addItem(it.first, it.second);
+  for (const auto& [language, code] : Host::GetAvailableLanguageList())
+    m_ui.language->addItem(QString::fromUtf8(language), QString::fromLatin1(code));
   SettingWidgetBinder::BindWidgetToStringSetting(nullptr, m_ui.language, "Main", "Language",
                                                  QtHost::GetDefaultLanguage());
   connect(m_ui.language, QOverload<int>::of(&QComboBox::currentIndexChanged), this,

src/duckstation-regtest/regtest_host.cpp

@@ -146,6 +146,16 @@ void Host::ReportDebuggerMessage(const std::string_view& message)
   Log_ErrorPrintf("ReportDebuggerMessage: %.*s", static_cast<int>(message.size()), message.data());
 }
 
+std::span<const std::pair<const char*, const char*>> Host::GetAvailableLanguageList()
+{
+  return {};
+}
+
+bool Host::ChangeLanguage(const char* new_language)
+{
+  return false;
+}
+
 s32 Host::Internal::GetTranslatedStringImpl(const std::string_view& context, const std::string_view& msg, char* tbuf,
                                             size_t tbuf_space)
 {

src/util/imgui_fullscreen.cpp

@@ -404,14 +404,14 @@ bool ImGuiFullscreen::UpdateLayoutScale()
   if (screen_ratio > LAYOUT_RATIO)
   {
     // screen is wider, use height, pad width
-    g_layout_scale = screen_height / LAYOUT_SCREEN_HEIGHT;
+    g_layout_scale = std::max(screen_height / LAYOUT_SCREEN_HEIGHT, 1.0f);
     g_layout_padding_top = 0.0f;
     g_layout_padding_left = (screen_width - (LAYOUT_SCREEN_WIDTH * g_layout_scale)) / 2.0f;
   }
   else
   {
     // screen is taller, use width, pad height
-    g_layout_scale = screen_width / LAYOUT_SCREEN_WIDTH;
+    g_layout_scale = std::max(screen_width / LAYOUT_SCREEN_WIDTH, 1.0f);
     g_layout_padding_top = (screen_height - (LAYOUT_SCREEN_HEIGHT * g_layout_scale)) / 2.0f;
     g_layout_padding_left = 0.0f;
   }

src/util/imgui_manager.cpp

@@ -251,7 +251,7 @@ void ImGuiManager::UpdateScale()
   const float window_scale = g_gpu_device ? g_gpu_device->GetWindowScale() : 1.0f;
   const float scale = std::max(window_scale * s_global_prescale, 1.0f);
 
-  if (scale == s_global_scale && (!HasFullscreenFonts() || !ImGuiFullscreen::UpdateLayoutScale()))
+  if ((!HasFullscreenFonts() || !ImGuiFullscreen::UpdateLayoutScale()) && scale == s_global_scale)
     return;
 
   s_global_scale = scale;
@@ -556,18 +556,18 @@ bool ImGuiManager::AddIconFonts(float size)
 {
   static constexpr ImWchar range_fa[] = {
     0xf002, 0xf002, 0xf005, 0xf005, 0xf007, 0xf007, 0xf00c, 0xf00e, 0xf011, 0xf011, 0xf013, 0xf013, 0xf017, 0xf017,
-    0xf019, 0xf019, 0xf01c, 0xf01c, 0xf021, 0xf021, 0xf023, 0xf023, 0xf025, 0xf025, 0xf027, 0xf028, 0xf02d, 0xf02e,
+    0xf019, 0xf019, 0xf01c, 0xf01c, 0xf021, 0xf021, 0xf023, 0xf023, 0xf025, 0xf025, 0xf027, 0xf028, 0xf02e, 0xf02e,
     0xf030, 0xf030, 0xf03a, 0xf03a, 0xf03d, 0xf03d, 0xf049, 0xf04c, 0xf050, 0xf050, 0xf059, 0xf059, 0xf05e, 0xf05e,
     0xf062, 0xf063, 0xf065, 0xf065, 0xf067, 0xf067, 0xf071, 0xf071, 0xf075, 0xf075, 0xf077, 0xf078, 0xf07b, 0xf07c,
     0xf084, 0xf085, 0xf091, 0xf091, 0xf0a0, 0xf0a0, 0xf0ac, 0xf0ad, 0xf0c5, 0xf0c5, 0xf0c7, 0xf0c8, 0xf0cb, 0xf0cb,
     0xf0d0, 0xf0d0, 0xf0dc, 0xf0dc, 0xf0e2, 0xf0e2, 0xf0eb, 0xf0eb, 0xf0f1, 0xf0f1, 0xf0f3, 0xf0f3, 0xf0fe, 0xf0fe,
     0xf110, 0xf110, 0xf119, 0xf119, 0xf11b, 0xf11c, 0xf140, 0xf140, 0xf144, 0xf144, 0xf14a, 0xf14a, 0xf15b, 0xf15b,
-    0xf15d, 0xf15d, 0xf188, 0xf188, 0xf191, 0xf192, 0xf1dd, 0xf1de, 0xf1e6, 0xf1e6, 0xf1eb, 0xf1eb, 0xf1f8, 0xf1f8,
-    0xf1fc, 0xf1fc, 0xf242, 0xf242, 0xf245, 0xf245, 0xf26c, 0xf26c, 0xf279, 0xf279, 0xf2d0, 0xf2d0, 0xf2db, 0xf2db,
-    0xf2f2, 0xf2f2, 0xf2f5, 0xf2f5, 0xf3c1, 0xf3c1, 0xf410, 0xf410, 0xf466, 0xf466, 0xf500, 0xf500, 0xf51f, 0xf51f,
-    0xf545, 0xf545, 0xf547, 0xf548, 0xf552, 0xf552, 0xf57a, 0xf57a, 0xf5a2, 0xf5a2, 0xf5aa, 0xf5aa, 0xf5e7, 0xf5e7,
-    0xf65d, 0xf65e, 0xf6a9, 0xf6a9, 0xf7c2, 0xf7c2, 0xf807, 0xf807, 0xf815, 0xf815, 0xf818, 0xf818, 0xf84c, 0xf84c,
-    0xf8cc, 0xf8cc, 0x0,    0x0};
+    0xf15d, 0xf15d, 0xf188, 0xf188, 0xf191, 0xf192, 0xf1ab, 0xf1ab, 0xf1dd, 0xf1de, 0xf1e6, 0xf1e6, 0xf1eb, 0xf1eb,
+    0xf1f8, 0xf1f8, 0xf1fc, 0xf1fc, 0xf242, 0xf242, 0xf245, 0xf245, 0xf26c, 0xf26c, 0xf279, 0xf279, 0xf2d0, 0xf2d0,
+    0xf2db, 0xf2db, 0xf2f2, 0xf2f2, 0xf2f5, 0xf2f5, 0xf3c1, 0xf3c1, 0xf410, 0xf410, 0xf466, 0xf466, 0xf500, 0xf500,
+    0xf51f, 0xf51f, 0xf545, 0xf545, 0xf547, 0xf548, 0xf552, 0xf552, 0xf57a, 0xf57a, 0xf5a2, 0xf5a2, 0xf5aa, 0xf5aa,
+    0xf5e7, 0xf5e7, 0xf65d, 0xf65e, 0xf6a9, 0xf6a9, 0xf7c2, 0xf7c2, 0xf807, 0xf807, 0xf815, 0xf815, 0xf818, 0xf818,
+    0xf84c, 0xf84c, 0xf8cc, 0xf8cc, 0x0,    0x0};
   static constexpr ImWchar range_pf[] = {0x2196, 0x2199, 0x219e, 0x21a1, 0x21b0, 0x21b3, 0x21ba, 0x21c3, 0x21c7, 0x21ca,
                                          0x21d0, 0x21d4, 0x21dc, 0x21dd, 0x21e0, 0x21e3, 0x21ed, 0x21ee, 0x21f7, 0x21f8,
                                          0x21fa, 0x21fb, 0x227a, 0x227d, 0x23f4, 0x23f7, 0x2427, 0x243a, 0x243c, 0x243c,