fix(skia): support color animations

src/Uno.UI/UI/Xaml/Media/Animation/Animators/AnimatorFactory.skia.cs

@@ -1,9 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using Uno.Extensions;
-using Uno.Foundation.Logging;
 using Windows.UI;
 
 namespace Microsoft.UI.Xaml.Media.Animation
@@ -14,6 +9,6 @@ private static IValueAnimator CreateDouble(Timeline timeline, double startingVal
 			=> new DispatcherDoubleAnimator(startingValue, targetValue);
 
 		private static IValueAnimator CreateColor(Timeline timeline, ColorOffset startingValue, ColorOffset targetValue)
-			=> new ImmediateAnimator<ColorOffset>(targetValue);
+			=> new DispatcherColorAnimator(startingValue, targetValue);
 	}
 }

src/Uno.UI/UI/Xaml/Media/Animation/Animators/DispatcherFloatAnimator.cs → src/Uno.UI/UI/Xaml/Media/Animation/Animators/DispatcherAnimator.cs

@@ -3,14 +3,14 @@
 
 namespace Microsoft.UI.Xaml.Media.Animation
 {
-	internal sealed class DispatcherFloatAnimator : CPUBoundAnimator<float>
+	internal abstract class DispatcherAnimator<T> : CPUBoundAnimator<T> where T : struct
 	{
 		public const int DefaultFrameRate = 30;
 
 		private readonly int _frameRate;
 		private readonly DispatcherTimer _timer;
 
-		public DispatcherFloatAnimator(float from, float to, int frameRate = DefaultFrameRate)
+		public DispatcherAnimator(T from, T to, int frameRate = DefaultFrameRate)
 			: base(from, to)
 		{
 			_frameRate = frameRate;
@@ -24,6 +24,6 @@ public DispatcherFloatAnimator(float from, float to, int frameRate = DefaultFram
 		protected override void SetStartFrameDelay(long delayMs) => _timer.Interval = TimeSpan.FromMilliseconds(delayMs);
 		protected override void SetAnimationFramesInterval() => _timer.Interval = TimeSpan.FromSeconds(1d / _frameRate);
 
-		protected override float GetUpdatedValue(long frame, float from, float to) => (float)_easing.Ease(frame, from, to, Duration);
+		protected abstract override T GetUpdatedValue(long frame, T from, T to);
 	}
 }

src/Uno.UI/UI/Xaml/Media/Animation/Animators/DispatcherColorAnimator.cs

@@ -0,0 +1,16 @@
+using System;
+using Windows.UI;
+
+namespace Microsoft.UI.Xaml.Media.Animation
+{
+	internal sealed class DispatcherColorAnimator(ColorOffset from, ColorOffset to, int frameRate = DispatcherAnimator<ConsoleColor>.DefaultFrameRate)
+		: DispatcherAnimator<ColorOffset>(from, to, frameRate)
+	{
+		protected override ColorOffset GetUpdatedValue(long frame, ColorOffset from, ColorOffset to) =>
+			ColorOffset.FromArgb(
+				(int)Math.Round(_easing.Ease(frame, from.A, to.A, Duration)),
+				(int)Math.Round(_easing.Ease(frame, from.R, to.R, Duration)),
+				(int)Math.Round(_easing.Ease(frame, from.G, to.G, Duration)),
+				(int)Math.Round(_easing.Ease(frame, from.B, to.B, Duration)));
+	}
+}

src/Uno.UI/UI/Xaml/Media/Animation/Animators/DispatcherDoubleAnimator.cs

@@ -1,29 +1,8 @@
-using System;
-using System.Linq;
-
-namespace Microsoft.UI.Xaml.Media.Animation
+namespace Microsoft.UI.Xaml.Media.Animation
 {
-	internal sealed class DispatcherDoubleAnimator : CPUBoundAnimator<double>
+	internal sealed class DispatcherDoubleAnimator(double from, double to, int frameRate = DispatcherAnimator<double>.DefaultFrameRate)
+		: DispatcherAnimator<double>(from, to, frameRate)
 	{
-		public const int DefaultFrameRate = 30;
-
-		private readonly int _frameRate;
-		private readonly DispatcherTimer _timer;
-
-		public DispatcherDoubleAnimator(double from, double to, int frameRate = DefaultFrameRate)
-			: base(from, to)
-		{
-			_frameRate = frameRate;
-			_timer = new DispatcherTimer();
-			_timer.Tick += OnFrame;
-		}
-
-		protected override void EnableFrameReporting() => _timer.Start();
-		protected override void DisableFrameReporting() => _timer.Stop();
-
-		protected override void SetStartFrameDelay(long delayMs) => _timer.Interval = TimeSpan.FromMilliseconds(delayMs);
-		protected override void SetAnimationFramesInterval() => _timer.Interval = TimeSpan.FromSeconds(1d / _frameRate);
-
 		protected override double GetUpdatedValue(long frame, double from, double to) => (float)_easing.Ease(frame, from, to, Duration);
 	}
 }

src/Uno.UI/UI/Xaml/Media/Animation/ColorAnimation.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using Uno;
 using Windows.UI;
 
@@ -138,6 +134,10 @@ ColorOffset IAnimation<ColorOffset>.Convert(object value)
 			{
 				return (ColorOffset)Colors.Parse(s);
 			}
+			else if (value is Color c)
+			{
+				return (ColorOffset)c;
+			}
 
 			// TODO: handle int?
 			return default(ColorOffset);