Automatically enable AdjustIndistinguishableColors if High Contrast mode enabled

src/cascadia/TerminalControl/ControlCore.cpp

@@ -941,6 +941,11 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         }
     }
 
+    void ControlCore::SetHighContrastInfo(const bool enabled)
+    {
+        _terminal->SetHighContrastInfo(enabled);
+    }
+
     Control::IControlSettings ControlCore::Settings()
     {
         return *_settings;

src/cascadia/TerminalControl/ControlCore.h

@@ -94,6 +94,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
 
         void UpdateSettings(const Control::IControlSettings& settings, const IControlAppearance& newAppearance);
         void ApplyAppearance(const bool focused);
+        void SetHighContrastInfo(const bool enabled);
         Control::IControlSettings Settings();
         Control::IControlAppearance FocusedAppearance() const;
         Control::IControlAppearance UnfocusedAppearance() const;

src/cascadia/TerminalControl/ControlCore.idl

@@ -102,6 +102,7 @@ namespace Microsoft.Terminal.Control
         IControlAppearance FocusedAppearance { get; };
         IControlAppearance UnfocusedAppearance { get; };
         Boolean HasUnfocusedAppearance();
+        void SetHighContrastInfo(Boolean enabled);
 
         UInt64 SwapChainHandle { get; };
 

src/cascadia/TerminalControl/TermControl.cpp

@@ -58,6 +58,8 @@ static Microsoft::Console::TSF::Handle& GetTSFHandle()
 
 namespace winrt::Microsoft::Terminal::Control::implementation
 {
+    Windows::UI::ViewManagement::AccessibilitySettings TermControl::_accessibilitySettings{};
+
     TsfDataProvider::TsfDataProvider(TermControl* termControl) noexcept :
         _termControl{ termControl }
     {
@@ -187,6 +189,12 @@ namespace winrt::Microsoft::Terminal::Control::implementation
 
         _core = _interactivity.Core();
 
+        // If high contrast mode was changed, update the appearance appropriately.
+        _accessibilitySettings.HighContrastChanged([this](const Windows::UI::ViewManagement::AccessibilitySettings& a11ySettings, auto&&) {
+            _core.SetHighContrastInfo(a11ySettings.HighContrast());
+            _core.ApplyAppearance(_focused);
+        });
+
         // This event is specifically triggered by the renderer thread, a BG thread. Use a weak ref here.
         _revokers.RendererEnteredErrorState = _core.RendererEnteredErrorState(winrt::auto_revoke, { get_weak(), &TermControl::_RendererEnteredErrorState });
 

src/cascadia/TerminalControl/TermControl.h

@@ -237,6 +237,8 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         friend struct TermControlT<TermControl>; // friend our parent so it can bind private event handlers
         friend struct TsfDataProvider;
 
+        static Windows::UI::ViewManagement::AccessibilitySettings _accessibilitySettings;
+
         // NOTE: _uiaEngine must be ordered before _core.
         //
         // ControlCore::AttachUiaEngine receives a IRenderEngine as a raw pointer, which we own.
@@ -361,7 +363,6 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         };
         bool _InitializeTerminal(const InitializeReason reason);
         safe_void_coroutine _restoreInBackground();
-        void _SetFontSize(int fontSize);
         void _TappedHandler(const Windows::Foundation::IInspectable& sender, const Windows::UI::Xaml::Input::TappedRoutedEventArgs& e);
         void _KeyDownHandler(const Windows::Foundation::IInspectable& sender, const Windows::UI::Xaml::Input::KeyRoutedEventArgs& e);
         void _KeyUpHandler(const Windows::Foundation::IInspectable& sender, const Windows::UI::Xaml::Input::KeyRoutedEventArgs& e);
@@ -393,8 +394,6 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         void _SwapChainSizeChanged(const Windows::Foundation::IInspectable& sender, const Windows::UI::Xaml::SizeChangedEventArgs& e);
         void _SwapChainScaleChanged(const Windows::UI::Xaml::Controls::SwapChainPanel& sender, const Windows::Foundation::IInspectable& args);
 
-        void _TerminalTabColorChanged(const std::optional<til::color> color);
-
         void _ScrollPositionChanged(const IInspectable& sender, const Control::ScrollPositionChangedArgs& args);
 
         bool _CapturePointer(const Windows::Foundation::IInspectable& sender, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& e);

src/cascadia/TerminalCore/ICoreAppearance.idl

@@ -23,7 +23,8 @@ namespace Microsoft.Terminal.Core
     {
         Never,
         Indexed,
-        Always
+        Always,
+        Automatic
     };
 
     // TerminalCore declares its own Color struct to avoid depending

src/cascadia/TerminalCore/Terminal.cpp

@@ -141,7 +141,20 @@ void Terminal::UpdateAppearance(const ICoreAppearance& appearance)
     renderSettings.SetRenderMode(RenderSettings::Mode::IntenseIsBold, appearance.IntenseIsBold());
     renderSettings.SetRenderMode(RenderSettings::Mode::IntenseIsBright, appearance.IntenseIsBright());
 
-    switch (appearance.AdjustIndistinguishableColors())
+    // If we're in high contrast mode and AIC is set to Automatic Indexed/Always,
+    // fallback to Indexed/Always respectively.
+    const auto deducedAIC = [this, &appearance]() {
+        const auto initialAIC = appearance.AdjustIndistinguishableColors();
+        switch (initialAIC)
+        {
+        case AdjustTextMode::Automatic:
+            return _highContrastMode ? AdjustTextMode::Indexed : AdjustTextMode::Never;
+        default:
+            return initialAIC;
+        }
+    }();
+
+    switch (deducedAIC)
     {
     case AdjustTextMode::Always:
         renderSettings.SetRenderMode(RenderSettings::Mode::IndexedDistinguishableColors, false);
@@ -211,6 +224,11 @@ void Terminal::UpdateAppearance(const ICoreAppearance& appearance)
     _NotifyScrollEvent();
 }
 
+void Terminal::SetHighContrastInfo(bool hc) noexcept
+{
+    _highContrastMode = hc;
+}
+
 void Terminal::SetCursorStyle(const DispatchTypes::CursorStyle cursorStyle)
 {
     auto& engine = reinterpret_cast<OutputStateMachineEngine&>(_stateMachine->Engine());

src/cascadia/TerminalCore/Terminal.hpp

@@ -92,6 +92,7 @@ class Microsoft::Terminal::Core::Terminal final :
 
     void UpdateSettings(winrt::Microsoft::Terminal::Core::ICoreSettings settings);
     void UpdateAppearance(const winrt::Microsoft::Terminal::Core::ICoreAppearance& appearance);
+    void SetHighContrastInfo(bool hc) noexcept;
     void SetFontInfo(const FontInfo& fontInfo);
     void SetCursorStyle(const ::Microsoft::Console::VirtualTerminal::DispatchTypes::CursorStyle cursorStyle);
     void SetVtChecksumReportSupport(const bool enabled);
@@ -382,6 +383,7 @@ class Microsoft::Terminal::Core::Terminal final :
 
     std::wstring _answerbackMessage;
     std::wstring _workingDirectory;
+    bool _highContrastMode = false;
 
     // This default fake font value is only used to check if the font is a raster font.
     // Otherwise, the font is changed to a real value with the renderer via TriggerFontChange.

src/cascadia/TerminalSettingsEditor/Resources/en-US/Resources.resw

@@ -942,6 +942,10 @@
     <value>Always</value>
     <comment>An option to choose from for the "adjust indistinguishable colors" setting. When selected, we will adjust the text colors for visibility.</comment>
   </data>
+  <data name="Profile_AdjustIndistinguishableColorsAutomatic.Content" xml:space="preserve">
+    <value>Automatic</value>
+    <comment>An option to choose from for the "adjust indistinguishable colors" setting. When selected, we will adjust the text colors for visibility only when the colors are part of this profile's color scheme's color table if and only if high contrast mode is enabled.</comment>
+  </data>
   <data name="Profile_CursorShapeBar.Content" xml:space="preserve">
     <value>Bar ( ┃ )</value>
     <comment>{Locked="┃"} An option to choose from for the "cursor shape" setting. When selected, the cursor will look like a vertical bar. The character in the parentheses is used to show what it looks like.</comment>
@@ -1961,4 +1965,4 @@
     <value>Display a shield in the title bar when Windows Terminal is running as Administrator</value>
     <comment>Header for a control to toggle displaying a shield in the title bar of the app. "Admin" refers to elevated sessions like "run as Admin"</comment>
   </data>
-</root>
+</root>

src/cascadia/TerminalSettingsModel/TerminalSettingsSerializationHelpers.h

@@ -35,10 +35,11 @@ JSON_ENUM_MAPPER(::winrt::Microsoft::Terminal::Core::CursorStyle)
 // - Helper for converting a user-specified adjustTextMode value to its corresponding enum
 JSON_ENUM_MAPPER(::winrt::Microsoft::Terminal::Core::AdjustTextMode)
 {
-    JSON_MAPPINGS(3) = {
+    JSON_MAPPINGS(4) = {
         pair_type{ "never", ValueType::Never },
         pair_type{ "indexed", ValueType::Indexed },
         pair_type{ "always", ValueType::Always },
+        pair_type{ "automatic", ValueType::Automatic },
     };
 
     // Override mapping parser to add boolean parsing

src/cascadia/inc/ControlProperties.h

@@ -14,7 +14,7 @@
     X(til::color, SelectionBackground, DEFAULT_FOREGROUND)                                                                \
     X(bool, IntenseIsBold)                                                                                                \
     X(bool, IntenseIsBright, true)                                                                                        \
-    X(winrt::Microsoft::Terminal::Core::AdjustTextMode, AdjustIndistinguishableColors, winrt::Microsoft::Terminal::Core::AdjustTextMode::Never)
+    X(winrt::Microsoft::Terminal::Core::AdjustTextMode, AdjustIndistinguishableColors, winrt::Microsoft::Terminal::Core::AdjustTextMode::Automatic)
 
 // --------------------------- Control Appearance ---------------------------
 //  All of these settings are defined in IControlAppearance.