Make it possible to use the TemporaryDefines with a INativeMagickImage.

Author: dlemstra

src/Magick.NET/Helpers/TemporaryDefines.cs

@@ -9,10 +9,15 @@ namespace ImageMagick;
 
 internal sealed class TemporaryDefines : IDisposable
 {
-    private readonly IMagickImage _image;
+    private readonly INativeMagickImage _image;
     private readonly List<string> _names = new();
 
     public TemporaryDefines(IMagickImage image)
+    {
+        _image = MagickImage.GetNativeImage(image);
+    }
+
+    public TemporaryDefines(INativeMagickImage image)
     {
         _image = image;
     }
@@ -34,10 +39,10 @@ public void SetArtifact(string name, string? value)
         _image.SetArtifact(name, value);
     }
 
-    public void SetArtifact(string name, bool value)
+    public void SetArtifact(string name, bool flag)
     {
         _names.Add(name);
-        _image.SetArtifact(name, value);
+        _image.SetArtifact(name, flag ? "true" : "false");
     }
 
     public void SetArtifact<TValue>(string name, TValue? value)

src/Magick.NET/Native/INativeMagickImage.cs

@@ -8,5 +8,9 @@ namespace ImageMagick
     internal interface INativeMagickImage
     {
         IntPtr Fx(string expression, Channels channels);
+
+        void RemoveArtifact(string name);
+
+        void SetArtifact(string name, string value);
     }
 }