Fixed a lot of isssues brought up by the analyzers

HPPH.SkiaSharp/HPPH.SkiaSharp.csproj

@@ -44,6 +44,10 @@
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
   </PropertyGroup>
 
+  <ItemGroup>
+    <GlobalAnalyzerConfigFiles Include="../Analyzers.globalconfig" />
+  </ItemGroup>
+
   <PropertyGroup Condition="'$(Configuration)'=='Debug'">
     <DefineConstants>$(DefineConstants);TRACE;DEBUG</DefineConstants>
     <DebugSymbols>true</DebugSymbols>

HPPH.SkiaSharp/ImageExtension.cs

@@ -1,17 +1,24 @@
 // ReSharper disable InconsistentNaming
 
 using System.Runtime.InteropServices;
-using System.Runtime.Versioning;
 using SkiaSharp;
 
 namespace HPPH.SkiaSharp;
 
 public static class ImageExtension
 {
-    public static unsafe SKImage ToSKImage(this IImage image) => SKImage.FromBitmap(image.ToSKBitmap());
+    public static unsafe SKImage ToSKImage(this IImage image)
+    {
+        ArgumentNullException.ThrowIfNull(image, nameof(image));
+
+        using SKBitmap bitmap = image.ToSKBitmap();
+        return SKImage.FromBitmap(bitmap);
+    }
 
     public static unsafe SKBitmap ToSKBitmap(this IImage image)
     {
+        ArgumentNullException.ThrowIfNull(image, nameof(image));
+
         SKBitmap bitmap = new(image.Width, image.Height, SKColorType.Bgra8888, SKAlphaType.Unpremul);
         nint pixelPtr = bitmap.GetPixels(out nint length);
         image.ConvertTo<ColorBGRA>().CopyTo(new Span<byte>((void*)pixelPtr, (int)length));
@@ -28,5 +35,9 @@ public static class ImageExtension
     public static IImage ToImage(this SKImage skImage) => SKBitmap.FromImage(skImage).ToImage();
 
     public static IImage ToImage(this SKBitmap bitmap)
-        => Image<ColorBGRA>.Create(MemoryMarshal.Cast<SKColor, ColorBGRA>(bitmap.Pixels), bitmap.Width, bitmap.Height);
+    {
+        ArgumentNullException.ThrowIfNull(bitmap, nameof(bitmap));
+
+        return Image<ColorBGRA>.Create(MemoryMarshal.Cast<SKColor, ColorBGRA>(bitmap.Pixels), bitmap.Width, bitmap.Height);
+    }
 }