enable for pens

Author: JimBobSquarePants

src/ImageSharp.Drawing/Processing/Pen.cs

@@ -1,8 +1,6 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
-#nullable disable
-
 namespace SixLabors.ImageSharp.Drawing.Processing;
 
 /// <summary>
@@ -104,15 +102,16 @@ public IPath GeneratePath(IPath path)
     public abstract IPath GeneratePath(IPath path, float strokeWidth);
 
     /// <inheritdoc/>
-    public virtual bool Equals(Pen other)
-        => this.StrokeWidth == other.StrokeWidth
+    public virtual bool Equals(Pen? other)
+        => other != null
+        && this.StrokeWidth == other.StrokeWidth
         && this.JointStyle == other.JointStyle
         && this.EndCapStyle == other.EndCapStyle
         && this.StrokeFill.Equals(other.StrokeFill)
         && this.StrokePattern.SequenceEqual(other.StrokePattern);
 
     /// <inheritdoc/>
-    public override bool Equals(object obj) => this.Equals(obj as Pen);
+    public override bool Equals(object? obj) => this.Equals(obj as Pen);
 
     /// <inheritdoc/>
     public override int GetHashCode()

src/ImageSharp.Drawing/Processing/PenOptions.cs

@@ -1,8 +1,6 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
-#nullable disable
-
 namespace SixLabors.ImageSharp.Drawing.Processing;
 
 /// <summary>
@@ -35,7 +33,7 @@ public PenOptions(Color color, float strokeWidth)
     /// <param name="color">The color.</param>
     /// <param name="strokeWidth">The stroke width in px units.</param>
     /// <param name="strokePattern">The stroke pattern.</param>
-    public PenOptions(Color color, float strokeWidth, float[] strokePattern)
+    public PenOptions(Color color, float strokeWidth, float[]? strokePattern)
         : this(new SolidBrush(color), strokeWidth, strokePattern)
     {
     }
@@ -46,7 +44,7 @@ public PenOptions(Color color, float strokeWidth, float[] strokePattern)
     /// <param name="strokeFill">The brush used to fill the stroke outline.</param>
     /// <param name="strokeWidth">The stroke width in px units.</param>
     /// <param name="strokePattern">The stroke pattern.</param>
-    public PenOptions(Brush strokeFill, float strokeWidth, float[] strokePattern)
+    public PenOptions(Brush strokeFill, float strokeWidth, float[]? strokePattern)
     {
         Guard.MustBeGreaterThan(strokeWidth, 0, nameof(strokeWidth));
 
@@ -70,7 +68,7 @@ public PenOptions(Brush strokeFill, float strokeWidth, float[] strokePattern)
     /// <summary>
     /// Gets the stroke pattern.
     /// </summary>
-    public float[] StrokePattern { get; }
+    public float[]? StrokePattern { get; }
 
     /// <summary>
     /// Gets or sets the joint style.