Added extensions for SkiaSharp

HPPH.SkiaSharp/HPPH.SkiaSharp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="SkiaSharp" Version="2.88.8" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\HPPH\HPPH.csproj" />
+  </ItemGroup>
+
+</Project>

HPPH.SkiaSharp/ImageExtension.cs

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+// 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 SKBitmap ToSKBitmap(this IImage 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));
+
+        return bitmap;
+    }
+
+    public static byte[] ToPng(this IImage image)
+    {
+        using SKImage skImage = image.ToSKImage();
+        return skImage.Encode(SKEncodedImageFormat.Png, 100).ToArray();
+    }
+
+    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);
+}

HPPH.SkiaSharp/ImageHelper.cs

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+using SkiaSharp;
+
+namespace HPPH.SkiaSharp;
+
+public static class ImageHelper
+{
+    public static IImage LoadImage(string path)
+    {
+        using SKImage image = SKImage.FromEncodedData(path);
+        return image.ToImage();
+    }
+
+    public static IImage LoadImage(Stream stream)
+    {
+        using SKImage image = SKImage.FromEncodedData(stream);
+        return image.ToImage();
+    }
+}