net9.0 
namespace System.Drawing.Drawing2D
{
    public sealed class Matrix : MarshalByRefObject, IDisposable
    {
        public void TransformPoints(params ReadOnlySpan<Point> pts);
    }
}
.NET
9.010.0
Information specific to net9.0
Assemblies

System.Drawing.Common , Version=9.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

System.Drawing.Common , Version=10.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to System.Drawing.Common.

Package System.Drawing.Common (9.0.3) net9.0
Platform Restrictions

This API is only supported on the following platforms:

  • Windows >= 6.1
  • Built-in API
  • Package-provided API