From 435da86a25d2e389b844b1cdf3c2c079b78d7263 Mon Sep 17 00:00:00 2001
From: Jason Nelson <jason@carbonmade.com>
Date: Mon, 1 Apr 2024 19:13:44 -0700
Subject: [PATCH] Make QuadPointsQuadrilateral a readonly struct

---
 src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs     | 6 +++---
 .../Annotations/QuadPointsQuadrilateral.cs                | 8 ++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs b/src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs
index 2ce4dacb..02fc7c4a 100644
--- a/src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs
+++ b/src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs
@@ -115,13 +115,13 @@
 
                         if (values.Count == 8)
                         {
-                            quadPointRectangles.Add(new QuadPointsQuadrilateral(new[]
-                            {
+                            quadPointRectangles.Add(new QuadPointsQuadrilateral(
+                            [
                                 matrix.Transform(new PdfPoint(values[0], values[1])),
                                 matrix.Transform(new PdfPoint(values[2], values[3])),
                                 matrix.Transform(new PdfPoint(values[4], values[5])),
                                 matrix.Transform(new PdfPoint(values[6], values[7]))
-                            }));
+                            ]));
 
                             values.Clear();
                         }
diff --git a/src/UglyToad.PdfPig/Annotations/QuadPointsQuadrilateral.cs b/src/UglyToad.PdfPig/Annotations/QuadPointsQuadrilateral.cs
index 5b11e881..e39973be 100644
--- a/src/UglyToad.PdfPig/Annotations/QuadPointsQuadrilateral.cs
+++ b/src/UglyToad.PdfPig/Annotations/QuadPointsQuadrilateral.cs
@@ -8,7 +8,7 @@
     /// A QuadPoints quadrilateral is four points defining the region for an annotation to use.
     /// An annotation may cover multiple quadrilaterals.
     /// </summary>
-    public class QuadPointsQuadrilateral
+    public readonly struct QuadPointsQuadrilateral
     {
         /// <summary>
         /// The 4 points defining this quadrilateral.
@@ -21,16 +21,16 @@
         /// <summary>
         /// Create a new <see cref="QuadPointsQuadrilateral"/>.
         /// </summary>
-        public QuadPointsQuadrilateral(IReadOnlyList<PdfPoint> points)
+        public QuadPointsQuadrilateral(PdfPoint[] points)
         {
             if (points is null)
             {
                 throw new ArgumentNullException(nameof(points));
             }
 
-            if (points.Count != 4)
+            if (points.Length != 4)
             {
-                throw new ArgumentException($"Quadpoints quadrilateral should only contain 4 points, instead got {points.Count} points.");
+                throw new ArgumentException($"Quadpoints quadrilateral should only contain 4 points, instead got {points.Length} points.");
             }
 
             Points = points;