refactor: Refactored System.Drawing and SkiaSharp code.

src/libs/H.NotifyIcon.Shared/H.NotifyIcon.Shared.projitems

@@ -22,11 +22,12 @@
     <Compile Include="$(MSBuildThisFileDirectory)TaskbarIcon.AttachedProperties.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)TaskbarIcon.MouseEvents.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Utilities\DpiUtilities.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)Utilities\FromSystemDrawingExtensions.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)Utilities\ImageExtensions.SystemDrawing.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)Utilities\ToSkiaSharpExtensions.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)Utilities\ToSystemDrawingExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Utilities\PngToIcoConverter.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Utilities\SkiaSharp\StreamExtensions.SkiaSharp.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Utilities\SkiaSharp\ToSkiaSharpExtensions.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Utilities\System.Drawing\FromSystemDrawingExtensions.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Utilities\System.Drawing\StreamExtensions.SystemDrawing.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Utilities\System.Drawing\ToSystemDrawingExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)TaskbarIcon.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)TaskbarIcon.Properties.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Utilities\ImageExtensions.cs" />

src/libs/H.NotifyIcon.Shared/Utilities/ImageExtensions.cs

@@ -2,7 +2,7 @@
 
 namespace H.NotifyIcon;
 
-internal static partial class ImageExtensions
+internal static class ImageExtensions
 {
 #if HAS_WPF
     internal static Stream ToStream(this Uri uri)

src/libs/H.NotifyIcon.Shared/Utilities/PngToIcoConverter.cs

@@ -1,12 +1,11 @@
-#if HAS_SYSTEM_DRAWING
-namespace H.NotifyIcon;
+namespace H.NotifyIcon;
 
 internal static class PngToIcoConverter
 {
     public static byte[] ConvertPngToIco(this byte[] data)
     {
         using var inStream = new MemoryStream(data);
-        using var source = System.Drawing.Image.FromStream(inStream);
+        var metadata = inStream.GetMetadata();
         using var outStream = new MemoryStream();
 
         // Header
@@ -25,9 +24,9 @@ public static byte[] ConvertPngToIco(this byte[] data)
         // Image entry
         {
             // Width
-            outStream.WriteByte((byte)source.Width);
+            outStream.WriteByte((byte)metadata.Width);
             // Height
-            outStream.WriteByte((byte)source.Height);
+            outStream.WriteByte((byte)metadata.Height);
             // Number of colors (0 = No palette)
             outStream.WriteByte(0);
             // Reserved
@@ -36,7 +35,7 @@ public static byte[] ConvertPngToIco(this byte[] data)
             outStream.WriteByte(1);
             outStream.WriteByte(0);
             // Bits per pixel
-            var bppAsLittle = IntToLittle2(System.Drawing.Image.GetPixelFormatSize(source.PixelFormat));
+            var bppAsLittle = IntToLittle2(metadata.BitsPerPixel);
             outStream.Write(bppAsLittle, 0, 2);
             // Size of data in bytes
             var byteCountAsLittle = IntToLittle4(data.Length);
@@ -69,4 +68,3 @@ private static byte[] IntToLittle4(int input)
         return b;
     }
 }
-#endif

src/libs/H.NotifyIcon.Shared/Utilities/SkiaSharp/StreamExtensions.SkiaSharp.cs

@@ -0,0 +1,23 @@
+#if HAS_SKIA_SHARP
+using H.NotifyIcon.Interop;
+using SkiaSharp;
+
+namespace H.NotifyIcon;
+
+internal static class StreamExtensions
+{
+    internal static Icon ToSmallIcon(this Stream stream)
+    {
+        var iconSize = IconUtilities.GetRequiredCustomIconSize(largeIcon: false).ScaleWithDpi();
+
+        return Icon.Decode(stream, new SKImageInfo(width: iconSize.Width, height: iconSize.Height));
+    }
+
+    internal static (int Width, int Height, int BitsPerPixel) GetMetadata(this Stream stream)
+    {
+        using var image = SKBitmap.Decode(stream);
+
+        return (image.Width, image.Height, image.BytesPerPixel * 8);
+    }
+}
+#endif

src/libs/H.NotifyIcon.Shared/Utilities/System.Drawing/StreamExtensions.SystemDrawing.cs

@@ -0,0 +1,22 @@
+#if HAS_SYSTEM_DRAWING
+using H.NotifyIcon.Interop;
+
+namespace H.NotifyIcon;
+
+internal static class StreamExtensions
+{
+    internal static Icon ToSmallIcon(this Stream stream)
+    {
+        var iconSize = IconUtilities.GetRequiredCustomIconSize(largeIcon: false).ScaleWithDpi();
+
+        return new Icon(stream, iconSize);
+    }
+
+    internal static (int Width, int Height, int BitsPerPixel) GetMetadata(this Stream stream)
+    {
+        using var image = System.Drawing.Image.FromStream(stream);
+
+        return (image.Width, image.Height, System.Drawing.Image.GetPixelFormatSize(image.PixelFormat));
+    }
+}
+#endif

src/libs/H.NotifyIcon.Wpf/H.NotifyIcon.Wpf.csproj

@@ -53,6 +53,7 @@ popups, context menus, and balloon messages. It can be used directly in code or
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="System.ValueTuple" Version="4.5.0" Condition="'$(TargetFramework)' == 'net4.6'" />
   </ItemGroup>
 
   <ItemGroup>