Merge branch 'master' into refactor/resources

src/Avalonia.Animation/Animatable.cs

@@ -1,10 +1,10 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
-using System.Linq;
-using System.Reactive.Linq;
-using Avalonia.Collections;
+using System.Collections.Specialized;
 using Avalonia.Data;
-using Avalonia.Animation.Animators;
+
+#nullable enable
 
 namespace Avalonia.Animation
 {
@@ -13,9 +13,24 @@ namespace Avalonia.Animation
     /// </summary>
     public class Animatable : AvaloniaObject
     {
+        /// <summary>
+        /// Defines the <see cref="Clock"/> property.
+        /// </summary>
         public static readonly StyledProperty<IClock> ClockProperty =
             AvaloniaProperty.Register<Animatable, IClock>(nameof(Clock), inherits: true);
 
+        /// <summary>
+        /// Defines the <see cref="Transitions"/> property.
+        /// </summary>
+        public static readonly StyledProperty<Transitions?> TransitionsProperty =
+            AvaloniaProperty.Register<Animatable, Transitions?>(nameof(Transitions));
+
+        private bool _transitionsEnabled = true;
+        private Dictionary<ITransition, TransitionState>? _transitionState;
+
+        /// <summary>
+        /// Gets or sets the clock which controls the animations on the control.
+        /// </summary>
         public IClock Clock
         {
             get => GetValue(ClockProperty);
@@ -23,68 +38,194 @@ namespace Avalonia.Animation
         }
 
         /// <summary>
-        /// Defines the <see cref="Transitions"/> property.
+        /// Gets or sets the property transitions for the control.
         /// </summary>
-        public static readonly DirectProperty<Animatable, Transitions> TransitionsProperty =
-            AvaloniaProperty.RegisterDirect<Animatable, Transitions>(
-                nameof(Transitions),
-                o => o.Transitions,
-                (o, v) => o.Transitions = v);
+        public Transitions? Transitions
+        {
+            get => GetValue(TransitionsProperty);
+            set => SetValue(TransitionsProperty, value);
+        }
 
-        private Transitions _transitions;
+        /// <summary>
+        /// Enables transitions for the control.
+        /// </summary>
+        /// <remarks>
+        /// This method should not be called from user code, it will be called automatically by the framework
+        /// when a control is added to the visual tree.
+        /// </remarks>
+        protected void EnableTransitions()
+        {
+            if (!_transitionsEnabled)
+            {
+                _transitionsEnabled = true;
 
-        private Dictionary<AvaloniaProperty, IDisposable> _previousTransitions;
+                if (Transitions is object)
+                {
+                    AddTransitions(Transitions);
+                }
+            }
+        }
 
         /// <summary>
-        /// Gets or sets the property transitions for the control.
+        /// Disables transitions for the control.
         /// </summary>
-        public Transitions Transitions
+        /// <remarks>
+        /// This method should not be called from user code, it will be called automatically by the framework
+        /// when a control is added to the visual tree.
+        /// </remarks>
+        protected void DisableTransitions()
+        {
+            if (_transitionsEnabled)
+            {
+                _transitionsEnabled = false;
+
+                if (Transitions is object)
+                {
+                    RemoveTransitions(Transitions);
+                }
+            }
+        }
+
+        protected sealed override void OnPropertyChangedCore<T>(AvaloniaPropertyChangedEventArgs<T> change)
         {
-            get
+            if (change.Property == TransitionsProperty && change.IsEffectiveValueChange)
             {
-                if (_transitions is null)
-                    _transitions = new Transitions();
+                var oldTransitions = change.OldValue.GetValueOrDefault<Transitions>();
+                var newTransitions = change.NewValue.GetValueOrDefault<Transitions>();
 
-                if (_previousTransitions is null)
-                    _previousTransitions = new Dictionary<AvaloniaProperty, IDisposable>();
+                if (oldTransitions is object)
+                {
+                    oldTransitions.CollectionChanged -= TransitionsCollectionChanged;
+                    RemoveTransitions(oldTransitions);
+                }
 
-                return _transitions;
+                if (newTransitions is object)
+                {
+                    newTransitions.CollectionChanged += TransitionsCollectionChanged;
+                    AddTransitions(newTransitions);
+                }
             }
-            set
+            else if (_transitionsEnabled &&
+                     Transitions is object &&
+                     _transitionState is object &&
+                     !change.Property.IsDirect &&
+                     change.Priority > BindingPriority.Animation)
             {
-                if (value is null)
-                    return;
+                foreach (var transition in Transitions)
+                {
+                    if (transition.Property == change.Property)
+                    {
+                        var state = _transitionState[transition];
+                        var oldValue = state.BaseValue;
+                        var newValue = GetAnimationBaseValue(transition.Property);
 
-                if (_previousTransitions is null)
-                    _previousTransitions = new Dictionary<AvaloniaProperty, IDisposable>();
+                        if (!Equals(oldValue, newValue))
+                        {
+                            state.BaseValue = newValue;
 
-                SetAndRaise(TransitionsProperty, ref _transitions, value);
+                            // We need to transition from the current animated value if present,
+                            // instead of the old base value.
+                            var animatedValue = GetValue(transition.Property);
+
+                            if (!Equals(newValue, animatedValue))
+                            {
+                                oldValue = animatedValue;
+                            }
+
+                            state.Instance?.Dispose();
+                            state.Instance = transition.Apply(
+                                this,
+                                Clock ?? AvaloniaLocator.Current.GetService<IGlobalClock>(),
+                                oldValue,
+                                newValue);
+                            return;
+                        }
+                    }
+                }
+            }
+
+            base.OnPropertyChangedCore(change);
+        }
+
+        private void TransitionsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+        {
+            if (!_transitionsEnabled)
+            {
+                return;
+            }
+
+            switch (e.Action)
+            {
+                case NotifyCollectionChangedAction.Add:
+                    AddTransitions(e.NewItems);
+                    break;
+                case NotifyCollectionChangedAction.Remove:
+                    RemoveTransitions(e.OldItems);
+                    break;
+                case NotifyCollectionChangedAction.Replace:
+                    RemoveTransitions(e.OldItems);
+                    AddTransitions(e.NewItems);
+                    break;
+                case NotifyCollectionChangedAction.Reset:
+                    throw new NotSupportedException("Transitions collection cannot be reset.");
             }
         }
 
-        protected override void OnPropertyChanged<T>(AvaloniaPropertyChangedEventArgs<T> change)
+        private void AddTransitions(IList items)
         {
-            if (_transitions is null || _previousTransitions is null || change.Priority == BindingPriority.Animation)
+            if (!_transitionsEnabled)
+            {
                 return;
+            }
+
+            _transitionState ??= new Dictionary<ITransition, TransitionState>();
 
-            // PERF-SENSITIVE: Called on every property change. Don't use LINQ here (too many allocations).
-            foreach (var transition in _transitions)
+            for (var i = 0; i < items.Count; ++i)
             {
-                if (transition.Property == change.Property)
+                var t = (ITransition)items[i];
+
+                _transitionState.Add(t, new TransitionState
                 {
-                    if (_previousTransitions.TryGetValue(change.Property, out var dispose))
-                        dispose.Dispose();
+                    BaseValue = GetAnimationBaseValue(t.Property),
+                });
+            }
+        }
 
-                    var instance = transition.Apply(
-                        this,
-                        Clock ?? Avalonia.Animation.Clock.GlobalClock,
-                        change.OldValue.GetValueOrDefault(),
-                        change.NewValue.GetValueOrDefault());
+        private void RemoveTransitions(IList items)
+        {
+            if (_transitionState is null)
+            {
+                return;
+            }
 
-                    _previousTransitions[change.Property] = instance;
-                    return;
+            for (var i = 0; i < items.Count; ++i)
+            {
+                var t = (ITransition)items[i];
+
+                if (_transitionState.TryGetValue(t, out var state))
+                {
+                    state.Instance?.Dispose();
+                    _transitionState.Remove(t);
                 }
             }
         }
+
+        private object GetAnimationBaseValue(AvaloniaProperty property)
+        {
+            var value = this.GetBaseValue(property, BindingPriority.LocalValue);
+
+            if (value == AvaloniaProperty.UnsetValue)
+            {
+                value = GetValue(property);
+            }
+
+            return value;
+        }
+
+        private class TransitionState
+        {
+            public IDisposable? Instance { get; set; }
+            public object? BaseValue { get; set; }
+        }
     }
 }

src/Avalonia.Animation/TransitionInstance.cs

@@ -19,6 +19,8 @@ namespace Avalonia.Animation
 
         public TransitionInstance(IClock clock, TimeSpan Duration)
         {
+            clock = clock ?? throw new ArgumentNullException(nameof(clock));
+
             _duration = Duration;
             _baseClock = clock;
         }

src/Avalonia.Animation/Transitions.cs

@@ -1,4 +1,6 @@
+using System;
 using Avalonia.Collections;
+using Avalonia.Threading;
 
 namespace Avalonia.Animation
 {
@@ -13,6 +15,17 @@ namespace Avalonia.Animation
         public Transitions()
         {
             ResetBehavior = ResetBehavior.Remove;
+            Validate = ValidateTransition;
+        }
+
+        private void ValidateTransition(ITransition obj)
+        {
+            Dispatcher.UIThread.VerifyAccess();
+
+            if (obj.Property.IsDirect)
+            {
+                throw new InvalidOperationException("Cannot animate a direct property.");
+            }
         }
     }
 }

src/Avalonia.Base/Utilities/TypeUtilities.cs

@@ -115,45 +115,46 @@ namespace Avalonia.Utilities
                 return true;
             }
 
+            var toUnderl = Nullable.GetUnderlyingType(to) ?? to;
             var from = value.GetType();
 
-            if (to.IsAssignableFrom(from))
+            if (toUnderl.IsAssignableFrom(from))
             {
                 result = value;
                 return true;
             }
 
-            if (to == typeof(string))
+            if (toUnderl == typeof(string))
             {
-                result = Convert.ToString(value);
+                result = Convert.ToString(value, culture);
                 return true;
             }
 
-            if (to.IsEnum && from == typeof(string))
+            if (toUnderl.IsEnum && from == typeof(string))
             {
-                if (Enum.IsDefined(to, (string)value))
+                if (Enum.IsDefined(toUnderl, (string)value))
                 {
-                    result = Enum.Parse(to, (string)value);
+                    result = Enum.Parse(toUnderl, (string)value);
                     return true;
                 }
             }
 
-            if (!from.IsEnum && to.IsEnum)
+            if (!from.IsEnum && toUnderl.IsEnum)
             {
                 result = null;
 
-                if (TryConvert(Enum.GetUnderlyingType(to), value, culture, out object enumValue))
+                if (TryConvert(Enum.GetUnderlyingType(toUnderl), value, culture, out object enumValue))
                 {
-                    result = Enum.ToObject(to, enumValue);
+                    result = Enum.ToObject(toUnderl, enumValue);
                     return true;
                 }
             }
 
-            if (from.IsEnum && IsNumeric(to))
+            if (from.IsEnum && IsNumeric(toUnderl))
             {
                 try
                 {
-                    result = Convert.ChangeType((int)value, to, culture);
+                    result = Convert.ChangeType((int)value, toUnderl, culture);
                     return true;
                 }
                 catch
@@ -164,7 +165,7 @@ namespace Avalonia.Utilities
             }
 
             var convertableFrom = Array.IndexOf(InbuiltTypes, from);
-            var convertableTo = Array.IndexOf(InbuiltTypes, to);
+            var convertableTo = Array.IndexOf(InbuiltTypes, toUnderl);
 
             if (convertableFrom != -1 && convertableTo != -1)
             {
@@ -172,7 +173,7 @@ namespace Avalonia.Utilities
                 {
                     try
                     {
-                        result = Convert.ChangeType(value, to, culture);
+                        result = Convert.ChangeType(value, toUnderl, culture);
                         return true;
                     }
                     catch
@@ -183,15 +184,23 @@ namespace Avalonia.Utilities
                 }
             }
 
-            var typeConverter = TypeDescriptor.GetConverter(to);
+            var toTypeConverter = TypeDescriptor.GetConverter(toUnderl);
+
+            if (toTypeConverter.CanConvertFrom(from) == true)
+            {
+                result = toTypeConverter.ConvertFrom(null, culture, value);
+                return true;
+            }
+
+            var fromTypeConverter = TypeDescriptor.GetConverter(from);
 
-            if (typeConverter.CanConvertFrom(from) == true)
+            if (fromTypeConverter.CanConvertTo(toUnderl) == true)
             {
-                result = typeConverter.ConvertFrom(null, culture, value);
+                result = fromTypeConverter.ConvertTo(null, culture, value, toUnderl);
                 return true;
             }
 
-            var cast = FindTypeConversionOperatorMethod(from, to, OperatorType.Implicit | OperatorType.Explicit);
+            var cast = FindTypeConversionOperatorMethod(from, toUnderl, OperatorType.Implicit | OperatorType.Explicit);
 
             if (cast != null)
             {

src/Avalonia.Controls/Presenters/TextPresenter.cs

@@ -75,6 +75,9 @@ namespace Avalonia.Controls.Presenters
         static TextPresenter()
         {
             AffectsRender<TextPresenter>(SelectionBrushProperty);
+            AffectsMeasure<TextPresenter>(TextProperty, PasswordCharProperty, 
+                TextAlignmentProperty, TextWrappingProperty, TextBlock.FontSizeProperty,
+                TextBlock.FontStyleProperty, TextBlock.FontWeightProperty, TextBlock.FontFamilyProperty);
 
             Observable.Merge(TextProperty.Changed, TextBlock.ForegroundProperty.Changed,
                 TextAlignmentProperty.Changed, TextWrappingProperty.Changed,
@@ -284,8 +287,6 @@ namespace Avalonia.Controls.Presenters
         protected void InvalidateFormattedText()
         {
             _formattedText = null;
-
-            InvalidateMeasure();
         }
 
         /// <summary>
@@ -301,13 +302,15 @@ namespace Avalonia.Controls.Presenters
                 context.FillRectangle(background, new Rect(Bounds.Size));
             }
 
-            FormattedText.Constraint = Bounds.Size;
-
             context.DrawText(Foreground, new Point(), FormattedText);
         }
 
         public override void Render(DrawingContext context)
         {
+            FormattedText.Constraint = Bounds.Size;
+
+            _constraint = Bounds.Size;
+
             var selectionStart = SelectionStart;
             var selectionEnd = SelectionEnd;
 
@@ -316,10 +319,6 @@ namespace Avalonia.Controls.Presenters
                 var start = Math.Min(selectionStart, selectionEnd);
                 var length = Math.Max(selectionStart, selectionEnd) - start;
 
-                // issue #600: set constraint before any FormattedText manipulation
-                //             see base.Render(...) implementation
-                FormattedText.Constraint = _constraint;
-
                 var rects = FormattedText.HitTestTextRange(start, length);
 
                 foreach (var rect in rects)

src/Avalonia.Controls/Shapes/Path.cs

@@ -1,5 +1,4 @@
 using System;
-using Avalonia.Data;
 using Avalonia.Media;
 
 namespace Avalonia.Controls.Shapes
@@ -9,6 +8,8 @@ namespace Avalonia.Controls.Shapes
         public static readonly StyledProperty<Geometry> DataProperty =
             AvaloniaProperty.Register<Path, Geometry>(nameof(Data));
 
+        private EventHandler _geometryChangedHandler;
+
         static Path()
         {
             AffectsGeometry<Path>(DataProperty);
@@ -21,21 +22,48 @@ namespace Avalonia.Controls.Shapes
             set { SetValue(DataProperty, value); }
         }
 
+        private EventHandler GeometryChangedHandler => _geometryChangedHandler ??= GeometryChanged;
+
         protected override Geometry CreateDefiningGeometry() => Data;
 
+        protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
+        {
+            base.OnAttachedToVisualTree(e);
+
+            if (Data is object)
+            {
+                Data.Changed += GeometryChangedHandler;
+            }
+        }
+
+        protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
+        {
+            base.OnDetachedFromVisualTree(e);
+
+            if (Data is object)
+            {
+                Data.Changed -= GeometryChangedHandler;
+            }
+        }
+
         private void DataChanged(AvaloniaPropertyChangedEventArgs e)
         {
+            if (VisualRoot is null)
+            {
+                return;
+            }
+
             var oldGeometry = (Geometry)e.OldValue;
             var newGeometry = (Geometry)e.NewValue;
 
             if (oldGeometry is object)
             {
-                oldGeometry.Changed -= GeometryChanged;
+                oldGeometry.Changed -= GeometryChangedHandler;
             }
 
             if (newGeometry is object)
             {
-                newGeometry.Changed += GeometryChanged;
+                newGeometry.Changed += GeometryChangedHandler;
             }
         }
 

src/Avalonia.Controls/Shapes/Shape.cs

@@ -2,38 +2,67 @@ using System;
 using Avalonia.Collections;
 using Avalonia.Media;
 
+#nullable enable
+
 namespace Avalonia.Controls.Shapes
 {
+    /// <summary>
+    /// Provides a base class for shape elements, such as <see cref="Ellipse"/>, <see cref="Polygon"/> and <see cref="Rectangle"/>.
+    /// </summary>
     public abstract class Shape : Control
     {
-        public static readonly StyledProperty<IBrush> FillProperty =
-            AvaloniaProperty.Register<Shape, IBrush>(nameof(Fill));
+        /// <summary>
+        /// Defines the <see cref="Fill"/> property.
+        /// </summary>
+        public static readonly StyledProperty<IBrush?> FillProperty =
+            AvaloniaProperty.Register<Shape, IBrush?>(nameof(Fill));
 
+        /// <summary>
+        /// Defines the <see cref="Stretch"/> property.
+        /// </summary>
         public static readonly StyledProperty<Stretch> StretchProperty =
             AvaloniaProperty.Register<Shape, Stretch>(nameof(Stretch));
 
-        public static readonly StyledProperty<IBrush> StrokeProperty =
-            AvaloniaProperty.Register<Shape, IBrush>(nameof(Stroke));
+        /// <summary>
+        /// Defines the <see cref="Stroke"/> property.
+        /// </summary>
+        public static readonly StyledProperty<IBrush?> StrokeProperty =
+            AvaloniaProperty.Register<Shape, IBrush?>(nameof(Stroke));
 
-        public static readonly StyledProperty<AvaloniaList<double>> StrokeDashArrayProperty =
-            AvaloniaProperty.Register<Shape, AvaloniaList<double>>(nameof(StrokeDashArray));
+        /// <summary>
+        /// Defines the <see cref="StrokeDashArray"/> property.
+        /// </summary>
+        public static readonly StyledProperty<AvaloniaList<double>?> StrokeDashArrayProperty =
+            AvaloniaProperty.Register<Shape, AvaloniaList<double>?>(nameof(StrokeDashArray));
 
+        /// <summary>
+        /// Defines the <see cref="StrokeDashOffset"/> property.
+        /// </summary>
         public static readonly StyledProperty<double> StrokeDashOffsetProperty =
             AvaloniaProperty.Register<Shape, double>(nameof(StrokeDashOffset));
 
+        /// <summary>
+        /// Defines the <see cref="StrokeThickness"/> property.
+        /// </summary>
         public static readonly StyledProperty<double> StrokeThicknessProperty =
             AvaloniaProperty.Register<Shape, double>(nameof(StrokeThickness));
 
+        /// <summary>
+        /// Defines the <see cref="StrokeLineCap"/> property.
+        /// </summary>
         public static readonly StyledProperty<PenLineCap> StrokeLineCapProperty =
             AvaloniaProperty.Register<Shape, PenLineCap>(nameof(StrokeLineCap), PenLineCap.Flat);
 
+        /// <summary>
+        /// Defines the <see cref="StrokeJoin"/> property.
+        /// </summary>
         public static readonly StyledProperty<PenLineJoin> StrokeJoinProperty =
             AvaloniaProperty.Register<Shape, PenLineJoin>(nameof(StrokeJoin), PenLineJoin.Miter);
 
         private Matrix _transform = Matrix.Identity;
-        private Geometry _definingGeometry;
-        private Geometry _renderedGeometry;
-        bool _calculateTransformOnArrange = false;
+        private Geometry? _definingGeometry;
+        private Geometry? _renderedGeometry;
+        private bool _calculateTransformOnArrange;
 
         static Shape()
         {
@@ -43,7 +72,10 @@ namespace Avalonia.Controls.Shapes
                 StrokeThicknessProperty, StrokeLineCapProperty, StrokeJoinProperty);
         }
 
-        public Geometry DefiningGeometry
+        /// <summary>
+        /// Gets a value that represents the <see cref="Geometry"/> of the shape.
+        /// </summary>
+        public Geometry? DefiningGeometry
         {
             get
             {
@@ -56,13 +88,10 @@ namespace Avalonia.Controls.Shapes
             }
         }
 
-        public IBrush Fill
-        {
-            get { return GetValue(FillProperty); }
-            set { SetValue(FillProperty, value); }
-        }
-
-        public Geometry RenderedGeometry
+        /// <summary>
+        /// Gets a value that represents the final rendered <see cref="Geometry"/> of the shape.
+        /// </summary>
+        public Geometry? RenderedGeometry
         {
             get
             {
@@ -93,42 +122,72 @@ namespace Avalonia.Controls.Shapes
             }
         }
 
+        /// <summary>
+        /// Gets or sets the <see cref="IBrush"/> that specifies how the shape's interior is painted.
+        /// </summary>
+        public IBrush? Fill
+        {
+            get { return GetValue(FillProperty); }
+            set { SetValue(FillProperty, value); }
+        }
+
+        /// <summary>
+        /// Gets or sets a <see cref="Stretch"/> enumeration value that describes how the shape fills its allocated space.
+        /// </summary>
         public Stretch Stretch
         {
             get { return GetValue(StretchProperty); }
             set { SetValue(StretchProperty, value); }
         }
 
-        public IBrush Stroke
+        /// <summary>
+        /// Gets or sets the <see cref="IBrush"/> that specifies how the shape's outline is painted.
+        /// </summary>
+        public IBrush? Stroke
         {
             get { return GetValue(StrokeProperty); }
             set { SetValue(StrokeProperty, value); }
         }
 
-        public AvaloniaList<double> StrokeDashArray
+        /// <summary>
+        /// Gets or sets a collection of <see cref="double"/> values that indicate the pattern of dashes and gaps that is used to outline shapes.
+        /// </summary>
+        public AvaloniaList<double>? StrokeDashArray
         {
             get { return GetValue(StrokeDashArrayProperty); }
             set { SetValue(StrokeDashArrayProperty, value); }
         }
 
+        /// <summary>
+        /// Gets or sets a value that specifies the distance within the dash pattern where a dash begins.
+        /// </summary>
         public double StrokeDashOffset
         {
             get { return GetValue(StrokeDashOffsetProperty); }
             set { SetValue(StrokeDashOffsetProperty, value); }
         }
 
+        /// <summary>
+        /// Gets or sets the width of the shape outline.
+        /// </summary>
         public double StrokeThickness
         {
             get { return GetValue(StrokeThicknessProperty); }
             set { SetValue(StrokeThicknessProperty, value); }
         }
 
+        /// <summary>
+        /// Gets or sets a <see cref="PenLineCap"/> enumeration value that describes the shape at the ends of a line.
+        /// </summary>
         public PenLineCap StrokeLineCap
         {
             get { return GetValue(StrokeLineCapProperty); }
             set { SetValue(StrokeLineCapProperty, value); }
         }
 
+        /// <summary>
+        /// Gets or sets a <see cref="PenLineJoin"/> enumeration value that specifies the type of join that is used at the vertices of a Shape.
+        /// </summary>
         public PenLineJoin StrokeJoin
         {
             get { return GetValue(StrokeJoinProperty); }
@@ -170,12 +229,20 @@ namespace Avalonia.Controls.Shapes
             }
         }
 
-        protected abstract Geometry CreateDefiningGeometry();
+        /// <summary>
+        /// Creates the shape's defining geometry.
+        /// </summary>
+        /// <returns>Defining <see cref="Geometry"/> of the shape.</returns>
+        protected abstract Geometry? CreateDefiningGeometry();
 
+        /// <summary>
+        /// Invalidates the geometry of this shape.
+        /// </summary>
         protected void InvalidateGeometry()
         {
             _renderedGeometry = null;
             _definingGeometry = null;
+
             InvalidateMeasure();
         }
 
@@ -321,8 +388,8 @@ namespace Avalonia.Controls.Shapes
             // portion changes.
             if (e.Property == BoundsProperty)
             {
-                var oldBounds = (Rect)e.OldValue;
-                var newBounds = (Rect)e.NewValue;
+                var oldBounds = (Rect)e.OldValue!;
+                var newBounds = (Rect)e.NewValue!;
 
                 if (oldBounds.Size == newBounds.Size)
                 {

src/Avalonia.Styling/Styling/PropertySetterBindingInstance.cs

@@ -24,6 +24,7 @@ namespace Avalonia.Styling
         private BindingValue<T> _value;
         private IDisposable? _subscription;
         private IDisposable? _subscriptionTwoWay;
+        private IDisposable? _innerSubscription;
         private bool _isActive;
 
         public PropertySetterBindingInstance(
@@ -121,6 +122,9 @@ namespace Avalonia.Styling
                 sub.Dispose();
             }
 
+            _innerSubscription?.Dispose();
+            _innerSubscription = null;
+
             base.Dispose();
         }
 
@@ -144,13 +148,13 @@ namespace Avalonia.Styling
 
         protected override void Subscribed()
         {
-            _subscription = _binding.Observable.Subscribe(_inner);
+            _innerSubscription = _binding.Observable.Subscribe(_inner);
         }
 
         protected override void Unsubscribed()
         {
-            _subscription?.Dispose();
-            _subscription = null;
+            _innerSubscription?.Dispose();
+            _innerSubscription = null;
         }
 
         private void PublishNext()

src/Avalonia.Visuals/Media/DrawingContext.cs

@@ -350,7 +350,7 @@ namespace Avalonia.Media
         /// </summary>
         /// <param name="matrix">The matrix</param>
         /// <returns>A disposable used to undo the transformation.</returns>
-        PushedState PushSetTransform(Matrix matrix)
+        public PushedState PushSetTransform(Matrix matrix)
         {
             var oldMatrix = CurrentTransform;
             CurrentTransform = matrix;

src/Avalonia.Visuals/Media/GlyphRun.cs

@@ -44,7 +44,6 @@ namespace Avalonia.Media
         /// <param name="characters">The characters.</param>
         /// <param name="glyphClusters">The glyph clusters.</param>
         /// <param name="biDiLevel">The bidi level.</param>
-        /// <param name="bounds">The bound.</param>
         public GlyphRun(
             GlyphTypeface glyphTypeface,
             double fontRenderingEmSize,
@@ -53,8 +52,7 @@ namespace Avalonia.Media
             ReadOnlySlice<Vector> glyphOffsets = default,
             ReadOnlySlice<char> characters = default,
             ReadOnlySlice<ushort> glyphClusters = default,
-            int biDiLevel = 0,
-            Rect? bounds = null)
+            int biDiLevel = 0)
         {
             GlyphTypeface = glyphTypeface;
 
@@ -71,8 +69,6 @@ namespace Avalonia.Media
             GlyphClusters = glyphClusters;
 
             BiDiLevel = biDiLevel;
-
-            Initialize(bounds);
         }
 
         /// <summary>
@@ -182,7 +178,7 @@ namespace Avalonia.Media
             {
                 if (_glyphRunImpl == null)
                 {
-                    Initialize(null);
+                    Initialize();
                 }
 
                 return _glyphRunImpl;
@@ -517,8 +513,7 @@ namespace Avalonia.Media
         /// <summary>
         /// Initializes the <see cref="GlyphRun"/>.
         /// </summary>
-        /// <param name="bounds">Optional pre computed bounds.</param>
-        private void Initialize(Rect? bounds)
+        private void Initialize()
         {
             if (GlyphIndices.Length == 0)
             {
@@ -541,16 +536,9 @@ namespace Avalonia.Media
 
             _glyphRunImpl = platformRenderInterface.CreateGlyphRun(this, out var width);
 
-            if (bounds.HasValue)
-            {
-                _bounds = bounds;
-            }
-            else
-            {
-                var height = (GlyphTypeface.Descent - GlyphTypeface.Ascent + GlyphTypeface.LineGap) * Scale;
+            var height = (GlyphTypeface.Descent - GlyphTypeface.Ascent + GlyphTypeface.LineGap) * Scale;
 
-                _bounds = new Rect(0, 0, width, height);
-            }
+            _bounds = new Rect(0, 0, width, height);
         }
 
         void IDisposable.Dispose()

src/Avalonia.Visuals/Rect.cs

@@ -421,11 +421,50 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Gets the union of two rectangles.
-        /// </summary>
-        /// <param name="rect">The other rectangle.</param>
-        /// <returns>The union.</returns>
-        public Rect Union(Rect rect)
+		/// Normalizes the rectangle so both the <see cref="Width"/> and <see 
+        /// cref="Height"/> are positive, without changing the location of the rectangle
+		/// </summary>
+        /// <returns>Normalized Rect</returns>
+		/// <remarks>
+		/// Empty rect will be return when Rect contains invalid values. Like NaN.
+		/// </remarks>
+		public Rect Normalize()
+        {
+            Rect rect = this;            
+
+            if(double.IsNaN(rect.Right) || double.IsNaN(rect.Bottom) || 
+                double.IsNaN(rect.X) || double.IsNaN(rect.Y) || 
+                double.IsNaN(Height) || double.IsNaN(Width))
+            {
+                return Rect.Empty;
+            }
+
+            if (rect.Width < 0)
+            {
+                var x = X + Width;
+                var width = X - x;
+
+                rect = rect.WithX(x).WithWidth(width);
+            }
+
+            if (rect.Height < 0)
+            {
+                var y = Y + Height;
+                var height = Y - y;
+
+                rect = rect.WithY(y).WithHeight(height);
+            }
+
+            return rect;
+        }
+
+
+            /// <summary>
+            /// Gets the union of two rectangles.
+            /// </summary>
+            /// <param name="rect">The other rectangle.</param>
+            /// <returns>The union.</returns>
+            public Rect Union(Rect rect)
         {
             if (IsEmpty)
             {

src/Avalonia.Visuals/Rendering/SceneGraph/DrawOperation.cs

@@ -11,7 +11,8 @@ namespace Avalonia.Rendering.SceneGraph
     {
         public DrawOperation(Rect bounds, Matrix transform)
         {
-            bounds = bounds.TransformToAABB(transform);
+            bounds = bounds.Normalize().TransformToAABB(transform);
+
             Bounds = new Rect(
                 new Point(Math.Floor(bounds.X), Math.Floor(bounds.Y)),
                 new Point(Math.Ceiling(bounds.Right), Math.Ceiling(bounds.Bottom)));

src/Avalonia.Visuals/Visual.cs

@@ -114,6 +114,9 @@ namespace Avalonia
         /// </summary>
         public Visual()
         {
+            // Disable transitions until we're added to the visual tree.
+            DisableTransitions();
+
             var visualChildren = new AvaloniaList<IVisual>();
             visualChildren.ResetBehavior = ResetBehavior.Remove;
             visualChildren.Validate = visual => ValidateVisualChild(visual);
@@ -393,6 +396,7 @@ namespace Avalonia
                 RenderTransform.Changed += RenderTransformChanged;
             }
 
+            EnableTransitions();
             OnAttachedToVisualTree(e);
             AttachedToVisualTree?.Invoke(this, e);
             InvalidateVisual();
@@ -429,6 +433,7 @@ namespace Avalonia
                 RenderTransform.Changed -= RenderTransformChanged;
             }
 
+            DisableTransitions();
             OnDetachedFromVisualTree(e);
             DetachedFromVisualTree?.Invoke(this, e);
             e.Root?.Renderer?.AddDirty(this);

tests/Avalonia.Animation.UnitTests/AnimatableTests.cs

@@ -0,0 +1,339 @@
+using System;
+using Avalonia.Controls;
+using Avalonia.Data;
+using Avalonia.Layout;
+using Avalonia.Styling;
+using Avalonia.UnitTests;
+using Moq;
+using Xunit;
+
+namespace Avalonia.Animation.UnitTests
+{
+    public class AnimatableTests
+    {
+        [Fact]
+        public void Transition_Is_Not_Applied_When_Not_Attached_To_Visual_Tree()
+        {
+            var target = CreateTarget();
+            var control = new Control
+            {
+                Transitions = new Transitions { target.Object },
+            };
+
+            control.Opacity = 0.5;
+
+            target.Verify(x => x.Apply(
+                control,
+                It.IsAny<IClock>(),
+                1.0,
+                0.5),
+                Times.Never);
+        }
+
+        [Fact]
+        public void Transition_Is_Not_Applied_To_Initial_Style()
+        {
+            using (UnitTestApplication.Start(TestServices.RealStyler))
+            {
+                var target = CreateTarget();
+                var control = new Control
+                {
+                    Transitions = new Transitions { target.Object },
+                };
+
+                var root = new TestRoot
+                {
+                    Styles =
+                    {
+                        new Style(x => x.OfType<Control>())
+                        {
+                            Setters =
+                            {
+                                new Setter(Visual.OpacityProperty, 0.8),
+                            }
+                        }
+                    }
+                };
+
+                root.Child = control;
+
+                Assert.Equal(0.8, control.Opacity);
+
+                target.Verify(x => x.Apply(
+                    It.IsAny<Control>(),
+                    It.IsAny<IClock>(),
+                    It.IsAny<object>(),
+                    It.IsAny<object>()),
+                    Times.Never);
+            }
+        }
+
+        [Fact]
+        public void Transition_Is_Applied_When_Local_Value_Changes()
+        {
+            var target = CreateTarget();
+            var control = CreateControl(target.Object);
+
+            control.Opacity = 0.5;
+
+            target.Verify(x => x.Apply(
+                control,
+                It.IsAny<IClock>(),
+                1.0,
+                0.5));
+        }
+
+        [Fact]
+        public void Transition_Is_Not_Applied_When_Animated_Value_Changes()
+        {
+            var target = CreateTarget();
+            var control = CreateControl(target.Object);
+
+            control.SetValue(Visual.OpacityProperty, 0.5, BindingPriority.Animation);
+
+            target.Verify(x => x.Apply(
+                control,
+                It.IsAny<IClock>(),
+                1.0,
+                0.5),
+                Times.Never);
+        }
+
+        [Fact]
+        public void Transition_Is_Not_Applied_When_StyleTrigger_Changes_With_LocalValue_Present()
+        {
+            var target = CreateTarget();
+            var control = CreateControl(target.Object);
+
+            control.SetValue(Visual.OpacityProperty, 0.5);
+
+            target.Verify(x => x.Apply(
+                control,
+                It.IsAny<IClock>(),
+                1.0,
+                0.5));
+            target.ResetCalls();
+
+            control.SetValue(Visual.OpacityProperty, 0.8, BindingPriority.StyleTrigger);
+
+            target.Verify(x => x.Apply(
+                It.IsAny<Control>(),
+                It.IsAny<IClock>(),
+                It.IsAny<object>(),
+                It.IsAny<object>()),
+                Times.Never);
+        }
+
+        [Fact]
+        public void Transition_Is_Disposed_When_Local_Value_Changes()
+        {
+            var target = CreateTarget();
+            var control = CreateControl(target.Object);
+            var sub = new Mock<IDisposable>();
+
+            target.Setup(x => x.Apply(control, It.IsAny<IClock>(), 1.0, 0.5)).Returns(sub.Object);
+
+            control.Opacity = 0.5;
+            sub.ResetCalls();
+            control.Opacity = 0.4;
+
+            sub.Verify(x => x.Dispose());
+        }
+
+        [Fact]
+        public void New_Transition_Is_Applied_When_Local_Value_Changes()
+        {
+            var target = CreateTarget();
+            var control = CreateControl(target.Object);
+
+            target.Setup(x => x.Property).Returns(Visual.OpacityProperty);
+            target.Setup(x => x.Apply(control, It.IsAny<IClock>(), 1.0, 0.5))
+                .Callback(() =>
+                {
+                    control.SetValue(Visual.OpacityProperty, 0.9, BindingPriority.Animation);
+                })
+                .Returns(Mock.Of<IDisposable>());
+
+            control.Opacity = 0.5;
+
+            Assert.Equal(0.9, control.Opacity);
+            target.ResetCalls();
+
+            control.Opacity = 0.4;
+
+            target.Verify(x => x.Apply(
+                control,
+                It.IsAny<IClock>(),
+                0.9,
+                0.4));
+        }
+
+        [Fact]
+        public void Transition_Is_Not_Applied_When_Removed_From_Visual_Tree()
+        {
+            var target = CreateTarget();
+            var control = CreateControl(target.Object);
+
+            control.Opacity = 0.5;
+
+            target.Verify(x => x.Apply(
+                control,
+                It.IsAny<IClock>(),
+                1.0,
+                0.5));
+            target.ResetCalls();
+
+            var root = (TestRoot)control.Parent;
+            root.Child = null;
+            control.Opacity = 0.8;
+
+            target.Verify(x => x.Apply(
+                It.IsAny<Control>(),
+                It.IsAny<IClock>(),
+                It.IsAny<object>(),
+                It.IsAny<object>()),
+                Times.Never);
+        }
+
+        [Fact]
+        public void Animation_Is_Cancelled_When_Transition_Removed()
+        {
+            var target = CreateTarget();
+            var control = CreateControl(target.Object);
+            var sub = new Mock<IDisposable>();
+
+            target.Setup(x => x.Apply(
+                It.IsAny<Animatable>(),
+                It.IsAny<IClock>(),
+                It.IsAny<object>(),
+                It.IsAny<object>())).Returns(sub.Object);
+
+            control.Opacity = 0.5;
+            control.Transitions.RemoveAt(0);
+
+            sub.Verify(x => x.Dispose());
+        }
+
+        [Fact]
+        public void Animation_Is_Cancelled_When_New_Style_Activates()
+        {
+            using (UnitTestApplication.Start(TestServices.RealStyler))
+            {
+                var target = CreateTarget();
+                var control = CreateStyledControl(target.Object);
+                var sub = new Mock<IDisposable>();
+
+                target.Setup(x => x.Apply(
+                    control,
+                    It.IsAny<IClock>(),
+                    1.0,
+                    0.5)).Returns(sub.Object);
+
+                control.Opacity = 0.5;
+
+                target.Verify(x => x.Apply(
+                    control,
+                    It.IsAny<Clock>(),
+                    1.0,
+                    0.5),
+                    Times.Once);
+
+                control.Classes.Add("foo");
+
+                sub.Verify(x => x.Dispose());
+            }
+        }
+
+        [Fact]
+        public void Transition_From_Style_Trigger_Is_Applied()
+        {
+            using (UnitTestApplication.Start(TestServices.RealStyler))
+            {
+                var target = CreateTransition(Control.WidthProperty);
+                var control = CreateStyledControl(transition2: target.Object);
+                var sub = new Mock<IDisposable>();
+
+                control.Classes.Add("foo");
+                control.Width = 100;
+
+                target.Verify(x => x.Apply(
+                    control,
+                    It.IsAny<Clock>(),
+                    double.NaN,
+                    100.0),
+                    Times.Once);
+            }
+        }
+
+        private static Mock<ITransition> CreateTarget()
+        {
+            return CreateTransition(Visual.OpacityProperty);
+        }
+
+        private static Control CreateControl(ITransition transition)
+        {
+            var control = new Control
+            {
+                Transitions = new Transitions { transition },
+            };
+
+            var root = new TestRoot(control);
+            return control;
+        }
+
+        private static Control CreateStyledControl(
+            ITransition transition1 = null,
+            ITransition transition2 = null)
+        {
+            transition1 = transition1 ?? CreateTarget().Object;
+            transition2 = transition2 ?? CreateTransition(Control.WidthProperty).Object;
+
+            var control = new Control
+            {
+                Styles =
+                {
+                    new Style(x => x.OfType<Control>())
+                    {
+                        Setters =
+                        {
+                            new Setter
+                            {
+                                Property = Control.TransitionsProperty,
+                                Value = new Transitions { transition1 },
+                            }
+                        }
+                    },
+                    new Style(x => x.OfType<Control>().Class("foo"))
+                    {
+                        Setters =
+                        {
+                            new Setter
+                            {
+                                Property = Control.TransitionsProperty,
+                                Value = new Transitions { transition2 },
+                            }
+                        }
+                    }
+                }
+            };
+
+            var root = new TestRoot(control);
+            return control;
+        }
+
+        private static Mock<ITransition> CreateTransition(AvaloniaProperty property)
+        {
+            var target = new Mock<ITransition>();
+            var sub = new Mock<IDisposable>();
+
+            target.Setup(x => x.Property).Returns(property);
+            target.Setup(x => x.Apply(
+                It.IsAny<Animatable>(),
+                It.IsAny<IClock>(),
+                It.IsAny<object>(),
+                It.IsAny<object>())).Returns(sub.Object);
+
+            return target;
+        }
+    }
+}

tests/Avalonia.Animation.UnitTests/TransitionsTests.cs

@@ -16,7 +16,7 @@ namespace Avalonia.Animation.UnitTests
             {
                 var border = new Border
                 {
-                    Transitions =
+                    Transitions = new Transitions
                     {
                         new DoubleTransition
                         {
@@ -44,7 +44,7 @@ namespace Avalonia.Animation.UnitTests
             {
                 var border = new Border
                 {
-                    Transitions =
+                    Transitions = new Transitions
                     {
                         new DoubleTransition
                         {

tests/Avalonia.Base.UnitTests/Data/DefaultValueConverterTests.cs

@@ -6,6 +6,7 @@ using System.Windows.Input;
 using System;
 using Avalonia.Data.Converters;
 using Avalonia.Layout;
+using System.ComponentModel;
 
 namespace Avalonia.Base.UnitTests.Data.Converters
 {
@@ -35,6 +36,54 @@ namespace Avalonia.Base.UnitTests.Data.Converters
             Assert.Equal(5.0, result);
         }
 
+        [Fact]
+        public void Do_Not_Throw_On_InvalidInput_For_NullableInt()
+        {
+            var result = DefaultValueConverter.Instance.Convert(
+                "<not-a-number>",
+                typeof(int?),
+                null,
+                CultureInfo.InvariantCulture);
+
+            Assert.IsType(typeof(BindingNotification), result);
+        }
+
+        [Fact]
+        public void Can_Convert_Decimal_To_NullableDouble()
+        {
+            var result = DefaultValueConverter.Instance.Convert(
+                5m,
+                typeof(double?),
+                null,
+                CultureInfo.InvariantCulture);
+
+            Assert.Equal(5.0, result);
+        }
+
+        [Fact]
+        public void Can_Convert_CustomType_To_Int()
+        {
+            var result = DefaultValueConverter.Instance.Convert(
+                new CustomType(123),
+                typeof(int),
+                null,
+                CultureInfo.InvariantCulture);
+
+            Assert.Equal(123, result);
+        }
+
+        [Fact]
+        public void Can_Convert_Int_To_CustomType()
+        {
+            var result = DefaultValueConverter.Instance.Convert(
+                123,
+                typeof(CustomType),
+                null,
+                CultureInfo.InvariantCulture);
+
+            Assert.Equal(new CustomType(123), result);
+        }
+
         [Fact]
         public void Can_Convert_String_To_Enum()
         {
@@ -187,5 +236,44 @@ namespace Avalonia.Base.UnitTests.Data.Converters
                 return v.Value;
             }
         }
+
+        [TypeConverter(typeof(CustomTypeConverter))]
+        private class CustomType {
+
+            public int Value { get; }
+
+            public CustomType(int value)
+            {
+                Value = value;
+            }
+
+            public override bool Equals(object obj)
+            {
+                return obj is CustomType other && this.Value == other.Value;
+            }
+        }
+
+        private class CustomTypeConverter : TypeConverter
+        {
+            public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
+            {
+                return destinationType == typeof(int);
+            }
+
+            public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
+            {
+                return sourceType == typeof(int);
+            }
+
+            public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
+            {
+                return ((CustomType)value).Value;
+            }
+
+            public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
+            {
+                return new CustomType((int)value);
+            }
+        }
     }
 }

tests/Avalonia.Controls.UnitTests/Shapes/PathTests.cs

@@ -23,12 +23,16 @@ namespace Avalonia.Controls.UnitTests.Shapes
             var geometry = new EllipseGeometry { Rect = new Rect(0, 0, 10, 10) };
             var target = new Path { Data = geometry };
 
+            var root = new TestRoot(target);
+
             target.Measure(Size.Infinity);
             Assert.True(target.IsMeasureValid);
 
             geometry.Rect = new Rect(0, 0, 20, 20);
 
             Assert.False(target.IsMeasureValid);
+
+            root.Child = null;
         }
     }
 }

tests/Avalonia.LeakTests/ControlTests.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Remoting.Contexts;
 using Avalonia.Controls;
+using Avalonia.Controls.Shapes;
 using Avalonia.Controls.Templates;
 using Avalonia.Diagnostics;
 using Avalonia.Input;
@@ -492,6 +493,45 @@ namespace Avalonia.LeakTests
             }
         }
 
+        [Fact]
+        public void Path_Is_Freed()
+        {
+            using (Start())
+            {
+                var geometry = new EllipseGeometry { Rect = new Rect(0, 0, 10, 10) };
+
+                Func<Window> run = () =>
+                {
+                    var window = new Window
+                    {
+                        Content = new Path
+                        {
+                            Data = geometry
+                        }
+                    };
+
+                    window.Show();
+
+                    window.LayoutManager.ExecuteInitialLayoutPass(window);
+                    Assert.IsType<Path>(window.Presenter.Child);
+
+                    window.Content = null;
+                    window.LayoutManager.ExecuteLayoutPass();
+                    Assert.Null(window.Presenter.Child);
+
+                    return window;
+                };
+
+                var result = run();
+
+                dotMemory.Check(memory =>
+                    Assert.Equal(0, memory.GetObjects(where => where.Type.Is<Path>()).ObjectsCount));
+
+                // We are keeping geometry alive to simulate a resource that outlives the control.
+                GC.KeepAlive(geometry);
+            }
+        }
+
         private IDisposable Start()
         {
             return UnitTestApplication.Start(TestServices.StyledWindow.With(

tests/Avalonia.Markup.Xaml.UnitTests/Xaml/StyleTests.cs

@@ -337,5 +337,50 @@ namespace Avalonia.Markup.Xaml.UnitTests.Xaml
                 Assert.Equal(Brushes.Red, listBox.Background);
             }
         }
+
+        [Fact]
+        public void Transitions_Can_Be_Styled()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var xaml = @"
+<Window xmlns='https://github.com/avaloniaui'
+             xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>
+    <Window.Styles>
+        <Style Selector='Border'>
+            <Setter Property='Transitions'>
+                <Transitions>
+                    <DoubleTransition Property='Width' Duration='0:0:1'/>
+                </Transitions>
+            </Setter>
+        </Style>
+        <Style Selector='Border.foo'>
+            <Setter Property='Transitions'>
+                <Transitions>
+                    <DoubleTransition Property='Height' Duration='0:0:1'/>
+                </Transitions>
+            </Setter>
+        </Style>
+    </Window.Styles>
+    <Border/>
+</Window>";
+                var loader = new AvaloniaXamlLoader();
+                var window = (Window)loader.Load(xaml);
+                var border = (Border)window.Content;
+
+                Assert.Equal(1, border.Transitions.Count);
+                Assert.Equal(Border.WidthProperty, border.Transitions[0].Property);
+
+                border.Classes.Add("foo");
+
+                Assert.Equal(1, border.Transitions.Count);
+                Assert.Equal(Border.HeightProperty, border.Transitions[0].Property);
+
+                border.Classes.Remove("foo");
+
+                Assert.Equal(1, border.Transitions.Count);
+                Assert.Equal(Border.WidthProperty, border.Transitions[0].Property);
+            }
+        }
     }
 }

tests/Avalonia.Markup.Xaml.UnitTests/Xaml/XamlIlTests.cs

@@ -34,9 +34,11 @@ namespace Avalonia.Markup.Xaml.UnitTests
             var parsed = (Grid)AvaloniaXamlLoader.Parse(@"
 <Grid xmlns='https://github.com/avaloniaui' >
   <Grid.Transitions>
-    <DoubleTransition Property='Opacity'
-       Easing='CircularEaseIn'
-       Duration='0:0:0.5' />
+    <Transitions>
+      <DoubleTransition Property='Opacity'
+        Easing='CircularEaseIn'
+        Duration='0:0:0.5' />
+    </Transitions>
   </Grid.Transitions>
 </Grid>");
             Assert.Equal(1, parsed.Transitions.Count);

tests/Avalonia.RenderTests/Media/ImageBrushTests.cs

@@ -192,11 +192,8 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             await RenderToFile(target);
             CompareImages();
         }
-#if AVALONIA_SKIA_SKIP_FAIL
-        [Fact(Skip = "FIXME")]
-#else
+
         [Fact]
-#endif
         public async Task ImageBrush_Fill_NoTile()
         {
             Decorator target = new Decorator
@@ -219,11 +216,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-#if AVALONIA_SKIA_SKIP_FAIL
-        [Fact(Skip = "FIXME")]
-#else
         [Fact]
-#endif
         public async Task ImageBrush_Uniform_NoTile()
         {
             Decorator target = new Decorator
@@ -246,11 +239,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-#if AVALONIA_SKIA_SKIP_FAIL
-        [Fact(Skip = "FIXME")]
-#else
         [Fact]
-#endif
         public async Task ImageBrush_UniformToFill_NoTile()
         {
             Decorator target = new Decorator

tests/Avalonia.RenderTests/Media/VisualBrushTests.cs

@@ -14,6 +14,10 @@ namespace Avalonia.Direct2D1.RenderTests.Media
 {
     public class VisualBrushTests : TestBase
     {
+        //Whitespaces are used here to be able to compare rendering results in a platform independent way.
+        //Otherwise tests will fail because of slightly different glyph rendering.
+        private static readonly string s_visualBrushText = "           ";
+
         public VisualBrushTests()
             : base(@"Media\VisualBrush")
         {
@@ -48,7 +52,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
                                 FontFamily = TestFontFamily,
                                 Background = Brushes.Green,
                                 Foreground = Brushes.Yellow,
-                                Text = "VisualBrush",
+                                Text = s_visualBrushText
                             }
                         }
                     }
@@ -56,7 +60,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             }
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_NoTile_Alignment_TopLeft()
         {
             Decorator target = new Decorator
@@ -81,7 +85,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_NoTile_Alignment_Center()
         {
             Decorator target = new Decorator
@@ -106,7 +110,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_NoTile_Alignment_BottomRight()
         {
             Decorator target = new Decorator
@@ -131,7 +135,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_Fill_NoTile()
         {
             Decorator target = new Decorator
@@ -154,7 +158,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_Uniform_NoTile()
         {
             Decorator target = new Decorator
@@ -177,7 +181,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_UniformToFill_NoTile()
         {
             Decorator target = new Decorator
@@ -200,7 +204,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_NoTile_BottomRightQuarterSource()
         {
             Decorator target = new Decorator
@@ -224,7 +228,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_NoTile_BottomRightQuarterDest()
         {
             Decorator target = new Decorator
@@ -248,7 +252,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_NoTile_BottomRightQuarterSource_BottomRightQuarterDest()
         {
             Decorator target = new Decorator
@@ -273,7 +277,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_Tile_BottomRightQuarterSource_CenterQuarterDest()
         {
             Decorator target = new Decorator
@@ -298,7 +302,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_FlipX_TopLeftDest()
         {
             Decorator target = new Decorator
@@ -322,7 +326,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_FlipY_TopLeftDest()
         {
             Decorator target = new Decorator
@@ -346,7 +350,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_NoStretch_FlipXY_TopLeftDest()
         {
             Decorator target = new Decorator
@@ -370,7 +374,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             CompareImages();
         }
 
-        [Fact(Skip = "Visual brush is broken in combination with text rendering.")]
+        [Fact]
         public async Task VisualBrush_InTree_Visual()
         {
             Border source;
@@ -391,7 +395,7 @@ namespace Avalonia.Direct2D1.RenderTests.Media
                             Child = new TextBlock
                             {
                                 FontFamily = TestFontFamily,
-                                Text = "Visual"
+                                Text = s_visualBrushText
                             }
                         }),
                         new Border

tests/Avalonia.Skia.UnitTests/TextLayoutTests.cs

@@ -508,7 +508,7 @@ namespace Avalonia.Skia.UnitTests
 
         private const string Text = "日本でTest一番読まれている英字新聞・ジャパンタイムズが発信する国内外ニュースと、様々なジャンルの特集記事。";
 
-        [Fact]
+        [Fact(Skip= "Only used for profiling.")]
         public void Should_Wrap()
         {
             using (Start())

tests/Avalonia.UnitTests/MockTextShaperImpl.cs

@@ -30,8 +30,7 @@ namespace Avalonia.UnitTests
                 width += glyphTypeface.GetGlyphAdvance(glyph);
             }
 
-            return new GlyphRun(glyphTypeface, textFormat.FontRenderingEmSize, glyphIndices, characters: text,
-                bounds: new Rect(0, 0, width, height));
+            return new GlyphRun(glyphTypeface, textFormat.FontRenderingEmSize, glyphIndices, characters: text);
         }
     }
 }

tests/Avalonia.Visuals.UnitTests/Media/GlyphRunTests.cs

@@ -128,10 +128,8 @@ namespace Avalonia.Visuals.UnitTests.Media
 
             var characters = new ReadOnlySlice<char>(new char[count], start, count);
 
-            var bounds = new Rect(0, 0, count * 10, 10);
-
             return new GlyphRun(new GlyphTypeface(new MockGlyphTypeface()), 10, glyphIndices, glyphAdvances,
-                glyphClusters: glyphClusters, characters: characters, biDiLevel: bidiLevel, bounds: bounds);
+                glyphClusters: glyphClusters, characters: characters, biDiLevel: bidiLevel);
         }
     }
 }

tests/Avalonia.Visuals.UnitTests/RectTests.cs

@@ -35,5 +35,24 @@ namespace Avalonia.Visuals.UnitTests
 
             Assert.Equal(new Rect(0, 0, 100, 100), result);
         }
+
+        [Fact]
+        public void Normalize_Should_Reverse_Negative_Size()
+        {
+            var result = new Rect(new Point(100, 100), new Point(0, 0)).Normalize();
+
+            Assert.Equal(new Rect(0, 0, 100, 100), result);
+        }
+
+        [Fact]
+        public void Normalize_Should_Make_Invalid_Rects_Empty()
+        {
+            var result = new Rect(
+                double.NegativeInfinity, double.PositiveInfinity, 
+                double.PositiveInfinity, double.PositiveInfinity)
+                .Normalize();
+
+            Assert.Equal(Rect.Empty, result);
+        }
     }
 }