Add support for custom box drawing and powerline glyphs

src/cascadia/TerminalControl/ControlCore.cpp

@@ -869,6 +869,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
 
         const auto lock = _terminal->LockForWriting();
 
+        _customGlyphs = _settings->CustomGlyphs();
         _cellWidth = CSSLengthPercentage::FromString(_settings->CellWidth().c_str());
         _cellHeight = CSSLengthPercentage::FromString(_settings->CellHeight().c_str());
         _runtimeOpacity = std::nullopt;
@@ -1047,6 +1048,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         _actualFont = { fontFace, 0, fontWeight.Weight, _desiredFont.GetEngineSize(), CP_UTF8, false };
         _actualFontFaceName = { fontFace };
 
+        _desiredFont.SetCustomGlyphs(_customGlyphs);
         _desiredFont.SetCellSize(_cellWidth, _cellHeight);
 
         const auto before = _actualFont.GetSize();

src/cascadia/TerminalControl/ControlCore.h

@@ -316,6 +316,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         FontInfoDesired _desiredFont;
         FontInfo _actualFont;
         winrt::hstring _actualFontFaceName;
+        bool _customGlyphs = true;
         CSSLengthPercentage _cellWidth;
         CSSLengthPercentage _cellHeight;
 

src/cascadia/TerminalControl/IControlSettings.idl

@@ -43,6 +43,7 @@ namespace Microsoft.Terminal.Control
         String Padding { get; };
         Windows.Foundation.Collections.IMap<String, UInt32> FontFeatures { get; };
         Windows.Foundation.Collections.IMap<String, Single> FontAxes { get; };
+        Boolean CustomGlyphs { get; };
         String CellWidth { get; };
         String CellHeight { get; };
 

src/cascadia/TerminalSettingsEditor/Appearances.h

@@ -87,6 +87,7 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
         OBSERVABLE_PROJECTED_SETTING(_appearance.SourceProfile().FontInfo(), FontFace);
         OBSERVABLE_PROJECTED_SETTING(_appearance.SourceProfile().FontInfo(), FontSize);
         OBSERVABLE_PROJECTED_SETTING(_appearance.SourceProfile().FontInfo(), FontWeight);
+        OBSERVABLE_PROJECTED_SETTING(_appearance.SourceProfile().FontInfo(), CustomGlyphs);
 
         OBSERVABLE_PROJECTED_SETTING(_appearance, RetroTerminalEffect);
         OBSERVABLE_PROJECTED_SETTING(_appearance, CursorShape);

src/cascadia/TerminalSettingsEditor/Appearances.idl

@@ -41,6 +41,7 @@ namespace Microsoft.Terminal.Settings.Editor
         OBSERVABLE_PROJECTED_APPEARANCE_SETTING(Single, FontSize);
         OBSERVABLE_PROJECTED_APPEARANCE_SETTING(Double, LineHeight);
         OBSERVABLE_PROJECTED_APPEARANCE_SETTING(Windows.UI.Text.FontWeight, FontWeight);
+        OBSERVABLE_PROJECTED_APPEARANCE_SETTING(Boolean, CustomGlyphs);
 
         OBSERVABLE_PROJECTED_APPEARANCE_SETTING(String, DarkColorSchemeName);
         OBSERVABLE_PROJECTED_APPEARANCE_SETTING(String, LightColorSchemeName);

src/cascadia/TerminalSettingsEditor/Appearances.xaml

@@ -287,6 +287,15 @@
                 </StackPanel>
             </local:SettingContainer>
 
+            <!--  Retro Terminal Effect  -->
+            <local:SettingContainer x:Uid="Profile_CustomGlyphs"
+                                    ClearSettingValue="{x:Bind Appearance.ClearCustomGlyphs}"
+                                    HasSettingValue="{x:Bind Appearance.HasCustomGlyphs, Mode=OneWay}"
+                                    SettingOverrideSource="{x:Bind Appearance.CustomGlyphsOverrideSource, Mode=OneWay}">
+                <ToggleSwitch IsOn="{x:Bind Appearance.CustomGlyphs, Mode=TwoWay}"
+                              Style="{StaticResource ToggleSwitchInExpanderStyle}" />
+            </local:SettingContainer>
+
             <!--  Retro Terminal Effect  -->
             <local:SettingContainer x:Uid="Profile_RetroTerminalEffect"
                                     ClearSettingValue="{x:Bind Appearance.ClearRetroTerminalEffect}"

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

@@ -886,6 +886,14 @@
     <value>1.2</value>
     <comment>"1.2" is a decimal number.</comment>
   </data>
+  <data name="Profile_CustomGlyphs.Header" xml:space="preserve">
+    <value>Custom Glyphs</value>
+    <comment>The main label of a toggle. When enabled, certain characters (glyphs) are replaced with better looking ones.</comment>
+  </data>
+  <data name="Profile_CustomGlyphs.HelpText" xml:space="preserve">
+    <value>When enabled, the terminal draws custom glyphs for block element and box drawing characters instead of using the font. This feature only works when GPU Acceleration is available.</value>
+    <comment>A longer description of the "Profile_CustomGlyphs" toggle. "glyphs", "block element" and "box drawing characters" are technical terms from the Unicode specification.</comment>
+  </data>
   <data name="Profile_FontWeightComboBox.[using:Windows.UI.Xaml.Automation]AutomationProperties.Name" xml:space="preserve">
     <value>Font weight</value>
     <comment>Name for a control to select the weight (i.e. bold, thin, etc.) of the text in the app.</comment>

src/cascadia/TerminalSettingsModel/FontConfig.idl

@@ -20,6 +20,7 @@ namespace Microsoft.Terminal.Settings.Model
         INHERITABLE_FONT_SETTING(Windows.UI.Text.FontWeight, FontWeight);
         INHERITABLE_FONT_SETTING(Windows.Foundation.Collections.IMap<String COMMA UInt32>, FontFeatures);
         INHERITABLE_FONT_SETTING(Windows.Foundation.Collections.IMap<String COMMA Single>, FontAxes);
+        INHERITABLE_FONT_SETTING(Boolean, CustomGlyphs);
         INHERITABLE_FONT_SETTING(String, CellWidth);
         INHERITABLE_FONT_SETTING(String, CellHeight);
     }

src/cascadia/TerminalSettingsModel/MTSMSettings.h

@@ -115,6 +115,7 @@ Author(s):
     X(winrt::Windows::UI::Text::FontWeight, FontWeight, "weight", DEFAULT_FONT_WEIGHT) \
     X(IFontAxesMap, FontAxes, "axes")                                                  \
     X(IFontFeatureMap, FontFeatures, "features")                                       \
+    X(bool, CustomGlyphs, "customGlyphs", true)                                        \
     X(winrt::hstring, CellWidth, "cellWidth")                                          \
     X(winrt::hstring, CellHeight, "cellHeight")
 

src/cascadia/TerminalSettingsModel/TerminalSettings.cpp

@@ -289,6 +289,7 @@ namespace winrt::Microsoft::Terminal::Settings::Model::implementation
         _FontWeight = fontInfo.FontWeight();
         _FontFeatures = fontInfo.FontFeatures();
         _FontAxes = fontInfo.FontAxes();
+        _CustomGlyphs = fontInfo.CustomGlyphs();
         _CellWidth = fontInfo.CellWidth();
         _CellHeight = fontInfo.CellHeight();
         _Padding = profile.Padding();

src/cascadia/TerminalSettingsModel/TerminalSettings.h

@@ -129,6 +129,7 @@ namespace winrt::Microsoft::Terminal::Settings::Model::implementation
         INHERITABLE_SETTING(Model::TerminalSettings, winrt::Windows::UI::Text::FontWeight, FontWeight);
         INHERITABLE_SETTING(Model::TerminalSettings, IFontAxesMap, FontAxes);
         INHERITABLE_SETTING(Model::TerminalSettings, IFontFeatureMap, FontFeatures);
+        INHERITABLE_SETTING(Model::TerminalSettings, bool, CustomGlyphs, true);
         INHERITABLE_SETTING(Model::TerminalSettings, hstring, CellWidth);
         INHERITABLE_SETTING(Model::TerminalSettings, hstring, CellHeight);
 

src/cascadia/inc/ControlProperties.h

@@ -63,6 +63,7 @@
     X(winrt::Windows::UI::Text::FontWeight, FontWeight)                                                                                                  \
     X(IFontFeatureMap, FontFeatures)                                                                                                                     \
     X(IFontAxesMap, FontAxes)                                                                                                                            \
+    X(bool, CustomGlyphs, true)                                                                                                                          \
     X(winrt::hstring, CellWidth)                                                                                                                         \
     X(winrt::hstring, CellHeight)                                                                                                                        \
     X(winrt::Microsoft::Terminal::Control::IKeyBindings, KeyBindings, nullptr)                                                                           \

src/inc/til/flat_set.h

@@ -4,8 +4,9 @@
 #pragma once
 
 #pragma warning(push)
-#pragma warning(disable : 26446) // Prefer to use gsl::at() instead of unchecked subscript operator (bounds.4).
 #pragma warning(disable : 26409) // Avoid calling new and delete explicitly, use std::make_unique<T> instead (r.11).
+#pragma warning(disable : 26432) // If you define or delete any default operation in the type '...', define or delete them all (c.21).
+#pragma warning(disable : 26446) // Prefer to use gsl::at() instead of unchecked subscript operator (bounds.4).
 
 namespace til
 {
@@ -36,7 +37,7 @@ namespace til
     // * small and cheap T
     // * >= 50% successful lookups
     // * <= 50% load factor (LoadFactor >= 2, which is the minimum anyways)
-    template<typename T, size_t LoadFactor = 2, size_t GrowthExponent = 1>
+    template<typename T, typename Traits, size_t LoadFactor = 2, size_t GrowthExponent = 1>
     struct linear_flat_set
     {
         static_assert(LoadFactor >= 2);
@@ -98,27 +99,28 @@ namespace til
                 return nullptr;
             }
 
-            const auto hash = ::std::hash<T>{}(key) >> _shift;
+            const auto hash = Traits::hash(key) >> _shift;
 
             for (auto i = hash;; ++i)
             {
                 auto& slot = _map[i & _mask];
-                if (!slot)
+                if (!Traits::occupied(slot))
                 {
                     return nullptr;
                 }
-                if (slot == key) [[likely]]
+                if (Traits::equals(slot, key)) [[likely]]
                 {
                     return &slot;
                 }
             }
         }
 
+        // NOTE: It also does not initialize the returned slot.
+        // You must do that yourself in way that ensures that Traits::occupied(slot) now returns true.
+        // Use lookup() to check if the item already exists.
         template<typename U>
-        std::pair<T&, bool> insert(U&& key)
+        std::pair<T*, bool> insert(U&& key)
         {
-            // Putting this into the lookup path is a little pessimistic, but it
-            // allows us to default-construct this hashmap with a size of 0.
             if (_load >= _capacity) [[unlikely]]
             {
                 _bumpSize();
@@ -129,20 +131,20 @@ namespace til
             // many times in literature that such a scheme performs the best on average.
             // As such, we perform the divide here to get the topmost bits down.
             // See flat_set_hash_integer.
-            const auto hash = ::std::hash<T>{}(key) >> _shift;
+            const auto hash = Traits::hash(key) >> _shift;
 
             for (auto i = hash;; ++i)
             {
                 auto& slot = _map[i & _mask];
-                if (!slot)
+                if (!Traits::occupied(slot))
                 {
-                    slot = std::forward<U>(key);
                     _load += LoadFactor;
-                    return { slot, true };
+                    Traits::assign(slot, key);
+                    return { &slot, true };
                 }
-                if (slot == key) [[likely]]
+                if (Traits::equals(slot, key)) [[likely]]
                 {
-                    return { slot, false };
+                    return { &slot, false };
                 }
             }
         }
@@ -166,17 +168,17 @@ namespace til
             // This mirrors the insert() function, but without the lookup part.
             for (auto& oldSlot : container())
             {
-                if (!oldSlot)
+                if (!Traits::occupied(oldSlot))
                 {
                     continue;
                 }
 
-                const auto hash = ::std::hash<T>{}(oldSlot) >> newShift;
+                const auto hash = Traits::hash(oldSlot) >> newShift;
 
                 for (auto i = hash;; ++i)
                 {
                     auto& slot = newMap[i & newMask];
-                    if (!slot)
+                    if (!Traits::occupied(slot))
                     {
                         slot = std::move_if_noexcept(oldSlot);
                         break;

src/inc/til/unicode.h

@@ -10,21 +10,28 @@ namespace til
         inline constexpr wchar_t UNICODE_REPLACEMENT = 0xFFFD;
     }
 
-    static constexpr bool is_surrogate(const wchar_t wch) noexcept
+    constexpr bool is_surrogate(const auto wch) noexcept
     {
         return (wch & 0xF800) == 0xD800;
     }
 
-    static constexpr bool is_leading_surrogate(const wchar_t wch) noexcept
+    constexpr bool is_leading_surrogate(const auto wch) noexcept
     {
         return (wch & 0xFC00) == 0xD800;
     }
 
-    static constexpr bool is_trailing_surrogate(const wchar_t wch) noexcept
+    constexpr bool is_trailing_surrogate(const auto wch) noexcept
     {
         return (wch & 0xFC00) == 0xDC00;
     }
 
+    constexpr char32_t combine_surrogates(const auto lead, const auto trail)
+    {
+        // Ah, I love these bracketed C-style casts. I use them in C all the time. Yep.
+#pragma warning(suppress : 26493) // Don't use C-style casts (type.4).
+        return (char32_t{ lead } << 10) - 0x35FDC00 + char32_t{ trail };
+    }
+
     // Verifies the beginning of the given UTF16 string and returns the first UTF16 sequence
     // or U+FFFD otherwise. It's not really useful and at the time of writing only a
     // single caller uses this. It's best to delete this if you read this comment.

src/renderer/atlas/AtlasEngine.api.cpp

@@ -295,8 +295,8 @@ CATCH_RETURN()
         /* fontStyle      */ DWRITE_FONT_STYLE_NORMAL,
         /* fontStretch    */ DWRITE_FONT_STRETCH_NORMAL,
         /* fontSize       */ _api.s->font->fontSize,
-        /* localeName     */ L"",
-        /* textFormat     */ textFormat.put()));
+        /* localeName     */ _p.userLocaleName.c_str(),
+        /* textFormat     */ textFormat.addressof()));
 
     wil::com_ptr<IDWriteTextLayout> textLayout;
     RETURN_IF_FAILED(_p.dwriteFactory->CreateTextLayout(glyph.data(), gsl::narrow_cast<uint32_t>(glyph.size()), textFormat.get(), FLT_MAX, FLT_MAX, textLayout.addressof()));
@@ -774,5 +774,7 @@ void AtlasEngine::_resolveFontMetrics(const wchar_t* requestedFaceName, const Fo
         fontMetrics->doubleUnderline[0] = { doubleUnderlinePosTopU16, thinLineWidthU16 };
         fontMetrics->doubleUnderline[1] = { doubleUnderlinePosBottomU16, thinLineWidthU16 };
         fontMetrics->overline = { 0, underlineWidthU16 };
+
+        fontMetrics->customGlyphs = fontInfoDesired.GetCustomGlyphs();
     }
 }