Implement basic font rendering tuning.

Ability to disable anti-aliasing for pixel perfect fonts like Courier New. Ability to disable hinting to forget about jagged WPF rendering.

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/Options/GeneralEditorOptions.xaml

@@ -1,33 +1,41 @@
-<?xml version="1.0" encoding="utf-8"?>
-<gui:OptionPanel
-	x:Class="ICSharpCode.AvalonEdit.AddIn.Options.GeneralEditorOptions" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:winforms="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration" xmlns:core="http://icsharpcode.net/sharpdevelop/core" xmlns:gui="clr-namespace:ICSharpCode.SharpDevelop.Gui;assembly=ICSharpCode.SharpDevelop" xmlns:local="clr-namespace:ICSharpCode.AvalonEdit.AddIn.Options" xmlns:widgets="http://icsharpcode.net/sharpdevelop/widgets">
-	<StackPanel>
-		<GroupBox
-			Header="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.FontGroupBox}">
-			<gui:FontSelector x:Name="fontSelectionPanel" />
-		</GroupBox>
-		<GroupBox
-			Header="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.GeneralOptionsGroupBox}">
+<?xml version="1.0" encoding="utf-8"?>
+<gui:OptionPanel
+	x:Class="ICSharpCode.AvalonEdit.AddIn.Options.GeneralEditorOptions" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:winforms="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration" xmlns:core="http://icsharpcode.net/sharpdevelop/core" xmlns:gui="clr-namespace:ICSharpCode.SharpDevelop.Gui;assembly=ICSharpCode.SharpDevelop" xmlns:local="clr-namespace:ICSharpCode.AvalonEdit.AddIn.Options" xmlns:widgets="http://icsharpcode.net/sharpdevelop/widgets">
+	<StackPanel>
+		<GroupBox
+			Header="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.FontGroupBox}">
 			<widgets:StackPanelWithSpacing SpaceBetweenItems="5">
+				<gui:FontSelector x:Name="fontSelectionPanel" />
 				<CheckBox
-					IsChecked="{core:OptionBinding local:CodeEditorOptions.WordWrap}"
-					Content="{core:Localize Dialog.Options.IDEOptions.OutputPanel.WordWrap}" />
-				<CheckBox 
-					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableFolding}"
-					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.FoldingCheckBox}" />
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableTextAntialiasing}"
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.EnableTextAntialiasing}" />
 				<CheckBox
-					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableChangeMarkerMargin}"
-					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.ChangeMarkerMarginCheckBox}" />
-				<CheckBox 
-					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableQuickClassBrowser}"
-					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.ShowQuickClassBrowserCheckBox}" />
-				<CheckBox 
-					IsChecked="{core:OptionBinding local:CodeEditorOptions.ShowLineNumbers}" 
-					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.Markers.LineNumberCheckBox}" />
-				<CheckBox 
-					IsChecked="{core:OptionBinding local:CodeEditorOptions.ShowHiddenDefinitions}" 
-					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.Markers.ShowHiddenDefinitionsCheckBox}" />
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableTextHinting}"
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.EnableTextHinting}" />
 			</widgets:StackPanelWithSpacing>
-		</GroupBox>
-	</StackPanel>
+		</GroupBox>
+		<GroupBox
+			Header="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.GeneralOptionsGroupBox}">
+			<widgets:StackPanelWithSpacing SpaceBetweenItems="5">
+				<CheckBox
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.WordWrap}"
+					Content="{core:Localize Dialog.Options.IDEOptions.OutputPanel.WordWrap}" />
+				<CheckBox 
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableFolding}"
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.FoldingCheckBox}" />
+				<CheckBox
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableChangeMarkerMargin}"
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.ChangeMarkerMarginCheckBox}" />
+				<CheckBox 
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableQuickClassBrowser}"
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.ShowQuickClassBrowserCheckBox}" />
+				<CheckBox 
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.ShowLineNumbers}" 
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.Markers.LineNumberCheckBox}" />
+				<CheckBox 
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.ShowHiddenDefinitions}" 
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.Markers.ShowHiddenDefinitionsCheckBox}" />
+			</widgets:StackPanelWithSpacing>
+		</GroupBox>
+	</StackPanel>
 </gui:OptionPanel>

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Rendering/TextView.cs

@@ -165,7 +165,41 @@ namespace ICSharpCode.AvalonEdit.Rendering
 				cachedElements = new TextViewCachedElements();
 			}
 		}
-		
+
+		void SetupTextRendering()
+		{
+			if (Options.EnableTextAntialiasing)
+			{
+				if (Options.EnableTextHinting)
+				{
+					if (CurrentZoom == 1.0)
+					{
+						TextOptions.SetTextFormattingMode(this, TextFormattingMode.Display);
+						TextOptions.SetTextRenderingMode(this, TextRenderingMode.ClearType);
+						TextOptions.SetTextHintingMode(this, TextHintingMode.Auto);
+					}
+					else
+					{
+						TextOptions.SetTextFormattingMode(this, TextFormattingMode.Ideal);
+						TextOptions.SetTextRenderingMode(this, TextRenderingMode.Grayscale);
+						TextOptions.SetTextHintingMode(this, TextHintingMode.Auto);
+					}
+				}
+				else
+				{
+					TextOptions.SetTextFormattingMode(this, TextFormattingMode.Ideal);
+					TextOptions.SetTextRenderingMode(this, TextRenderingMode.Grayscale);
+					TextOptions.SetTextHintingMode(this, TextHintingMode.Animated);
+				}
+			}
+			else
+			{
+				TextOptions.SetTextFormattingMode(this, TextFormattingMode.Display);
+				TextOptions.SetTextRenderingMode(this, TextRenderingMode.Aliased);
+				TextOptions.SetTextHintingMode(this, TextHintingMode.Auto);
+			}
+		}
+
 		/// <inheritdoc cref="IWeakEventListener.ReceiveWeakEvent"/>
 		protected virtual bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
 		{
@@ -224,7 +258,8 @@ namespace ICSharpCode.AvalonEdit.Rendering
 				columnRulerRenderer.SetRuler(Options.ColumnRulerPosition, ColumnRulerPen);
 			else
 				columnRulerRenderer.SetRuler(-1, ColumnRulerPen);
-			
+
+			SetupTextRendering();
 			UpdateBuiltinElementGeneratorsFromOptions();
 			Redraw();
 		}
@@ -1418,7 +1453,19 @@ namespace ICSharpCode.AvalonEdit.Rendering
 		}
 		
 		ScrollViewer IScrollInfo.ScrollOwner { get; set; }
-		
+
+		/// <summary>
+		/// Gets the zoom level;
+		/// </summary>
+		public double CurrentZoom
+		{
+			get
+			{
+				dynamic scrollOwner = ((IScrollInfo) this).ScrollOwner;
+				return scrollOwner?.CurrentZoom ?? 1.0;
+			}
+		}
+
 		void IScrollInfo.LineUp()
 		{
 			((IScrollInfo)this).SetVerticalOffset(scrollOffset.Y - DefaultLineHeight);
@@ -1999,6 +2046,8 @@ namespace ICSharpCode.AvalonEdit.Rendering
 		protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
 		{
 			base.OnPropertyChanged(e);
+			if (e.Property == TextView.ActualHeightProperty)
+				SetupTextRendering();
 			if (TextFormatterFactory.PropertyChangeAffectsTextFormatter(e.Property)) {
 				// first, create the new text formatter:
 				RecreateTextFormatter();

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/TextEditorOptions.cs

@@ -493,5 +493,49 @@ namespace ICSharpCode.AvalonEdit
 				}
 			}
 		}
+
+		bool enableTextAntialiasing = true;
+
+		/// <summary>
+		/// Gets/Sets if anti-aliasing should be applied while text rendering.
+		/// </summary>
+		[DefaultValue(true)]
+		public bool EnableTextAntialiasing
+		{
+			get
+			{
+				return enableTextAntialiasing;
+			}
+			set
+			{
+				if (enableTextAntialiasing != value)
+				{
+					enableTextAntialiasing = value;
+					OnPropertyChanged("EnableTextAntialiasing");
+				}
+			}
+		}
+
+		bool enableTextHinting = true;
+
+		/// <summary>
+		/// Gets/Sets if TrueType hinting should be applied while text rendering.
+		/// </summary>
+		[DefaultValue(true)]
+		public bool EnableTextHinting
+		{
+			get
+			{
+				return enableTextHinting;
+			}
+			set
+			{
+				if (enableTextHinting != value)
+				{
+					enableTextHinting = value;
+					OnPropertyChanged("EnableTextHinting");
+				}
+			}
+		}
 	}
 }