refactor effects.

src/Windows/Avalonia.Win32/Composition/CompositionHost.cs

@@ -121,18 +121,28 @@ namespace Avalonia.Win32
 
         public SpriteVisual CreateBlur()
         {
-            var effect = new GaussianBlurEffect();
+            var blurEffect = new GaussianBlurEffect(new CompositionEffectSourceParameter ("backdrop"));
-            var effectFactory = _compositor.CreateEffectFactory(effect);
+            var blurEffectFactory = _compositor.CreateEffectFactory(blurEffect);
-            var blurBrush = effectFactory.CreateBrush();
 
+            var blurBrush = blurEffectFactory.CreateBrush();
             var backDropBrush = _compositor.CreateBackdropBrush();
 
             blurBrush.SetSourceParameter("backdrop", backDropBrush);
 
+
+            var saturateEffect = new SaturationEffect(blurEffect);
+            var satEffectFactory = _compositor.CreateEffectFactory(saturateEffect);
+
+
+            var satBrush = satEffectFactory.CreateBrush();
+            satBrush.SetSourceParameter("backdrop", backDropBrush);
+
+            
+
             var visual = _compositor.CreateSpriteVisual();
 
             visual.RelativeSizeAdjustment = new System.Numerics.Vector2(1.0f, 1.0f);
-            visual.Brush = blurBrush;
+            visual.Brush = satBrush;
 
             return visual;
         }

src/Windows/Avalonia.Win32/Composition/EffectBase.cs

@@ -0,0 +1,45 @@
+using System;
+using Windows.Graphics.Effects;
+using Windows.Graphics.Effects.Interop;
+
+
+namespace Avalonia.Win32
+{
+    abstract class EffectBase : IGraphicsEffect,  IGraphicsEffectSource, global::Windows.Graphics.Effects.Interop.IGraphicsEffectD2D1Interop
+    {
+        private IGraphicsEffectSource[] _sources;
+
+        public EffectBase(params IGraphicsEffectSource[] sources)
+        {
+            _sources = sources;
+        }
+
+        private IGraphicsEffectSource _source;
+
+        public virtual string Name { get; set; }
+
+        public abstract Guid EffectId { get; }
+
+        public abstract uint PropertyCount { get; }
+
+        public uint SourceCount => (uint)_sources.Length;
+
+        public IGraphicsEffectSource GetSource(uint index)
+        {
+            if(index < _sources.Length)
+            {
+                return _sources[index];
+            }
+
+            return null;
+        }
+
+        public uint GetNamedPropertyMapping(string name, out GRAPHICS_EFFECT_PROPERTY_MAPPING mapping)
+        {
+            throw new NotImplementedException();
+        }
+
+        public abstract object GetProperty(uint index);
+    }
+}
+

src/Windows/Avalonia.Win32/Composition/GaussianBlurEffect.cs

@@ -1,13 +1,14 @@
 using System;
 using Windows.Graphics.Effects;
-using Windows.Graphics.Effects.Interop;
-using Windows.UI.Composition;
-
 
 namespace Avalonia.Win32
 {
-    class GaussianBlurEffect : IGraphicsEffect, IGraphicsEffectSource, global::Windows.Graphics.Effects.Interop.IGraphicsEffectD2D1Interop
+    class GaussianBlurEffect : EffectBase
     {
+        public GaussianBlurEffect(IGraphicsEffectSource source) : base(source)
+        {
+        }
+
         enum D2D1_GAUSSIANBLUR_OPTIMIZATION
         {
             D2D1_GAUSSIANBLUR_OPTIMIZATION_SPEED,
@@ -31,20 +32,11 @@ namespace Avalonia.Win32
             D2D1_GAUSSIANBLUR_PROP_FORCE_DWORD
         };
 
-        public string Name { get; set; }
+        public override Guid EffectId => D2DEffects.CLSID_D2D1GaussianBlur;
-
-        public Guid EffectId => D2DEffects.CLSID_D2D1GaussianBlur;
 
-        public uint PropertyCount => 3;
+        public override uint PropertyCount => 3;
-
-        public uint SourceCount => 1;
-
-        public uint GetNamedPropertyMapping(string name, out GRAPHICS_EFFECT_PROPERTY_MAPPING mapping)
-        {
-            throw new NotImplementedException();
-        }
 
-        public object GetProperty(uint index)
+        public override object GetProperty(uint index)
         {
             switch ((D2D1GaussianBlurProp)index)
             {
@@ -52,28 +44,14 @@ namespace Avalonia.Win32
                     return 30.0f;
 
                 case D2D1GaussianBlurProp.D2D1_GAUSSIANBLUR_PROP_OPTIMIZATION:
-                    return (UInt32)D2D1_GAUSSIANBLUR_OPTIMIZATION.D2D1_GAUSSIANBLUR_OPTIMIZATION_BALANCED;
+                    return (uint)D2D1_GAUSSIANBLUR_OPTIMIZATION.D2D1_GAUSSIANBLUR_OPTIMIZATION_BALANCED;
 
                 case D2D1GaussianBlurProp.D2D1_GAUSSIANBLUR_PROP_BORDER_MODE:
-                    return (UInt32)D2D1_BORDER_MODE.D2D1_BORDER_MODE_HARD;
+                    return (uint)D2D1_BORDER_MODE.D2D1_BORDER_MODE_HARD;
             }
 
             return null;
         }
-
-        private IGraphicsEffectSource _source = new CompositionEffectSourceParameter("backdrop");
-
-        public IGraphicsEffectSource GetSource(uint index)
-        {
-            if (index == 0)
-            {
-                return _source;
-            }
-            else
-            {
-                return null;
-            }
-        }
     }
 }
 

src/Windows/Avalonia.Win32/Composition/SaturationEffect.cs

@@ -0,0 +1,35 @@
+using System;
+using Windows.Graphics.Effects;
+
+
+namespace Avalonia.Win32
+{
+    class SaturationEffect : EffectBase
+    {
+        public SaturationEffect(IGraphicsEffect source) : base(source)
+        {
+        }
+
+        enum D2D1_SATURATION_PROP
+        {
+            D2D1_SATURATION_PROP_SATURATION,
+            D2D1_SATURATION_PROP_FORCE_DWORD
+        };
+
+        public override Guid EffectId => D2DEffects.CLSID_D2D1Saturation;
+
+        public override uint PropertyCount => 1;
+
+        public override object GetProperty(uint index)
+        {
+            switch ((D2D1_SATURATION_PROP)index)
+            {
+                case D2D1_SATURATION_PROP.D2D1_SATURATION_PROP_SATURATION:
+                    return 2.0f;
+            }
+
+            return null;
+        }
+    }
+}
+