refactor: use Fischless

Fischless.WindowCapture/BitmapExtensions.cs

@@ -0,0 +1,14 @@
+namespace Fischless.WindowCapture;
+
+internal static class BitmapExtensions
+{
+    public static Bitmap Crop(this Bitmap src, int x, int y, int width, int height)
+    {
+        Rectangle cropRect = new(x, y, width, height);
+        Bitmap target = new(cropRect.Width, cropRect.Height);
+
+        using System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(target);
+        g.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height), cropRect, GraphicsUnit.Pixel);
+        return target;
+    }
+}