From b6dd39f55ed15387560a39dd9e897ab691f47103 Mon Sep 17 00:00:00 2001
From: Ynse Hoornenborg <github@ynse.nl>
Date: Sat, 4 Jan 2025 18:02:41 +0100
Subject: [PATCH] Initialize TransformInfo array

---
 src/ImageSharp/Formats/Heif/Av1/Tiling/Av1FrameInfo.cs    | 6 ++++++
 .../Formats/Heif/Av1/Tiling/Av1TransformInfo.cs           | 8 ++++++++
 2 files changed, 14 insertions(+)

diff --git a/src/ImageSharp/Formats/Heif/Av1/Tiling/Av1FrameInfo.cs b/src/ImageSharp/Formats/Heif/Av1/Tiling/Av1FrameInfo.cs
index f071eb21d3..a61f14657a 100644
--- a/src/ImageSharp/Formats/Heif/Av1/Tiling/Av1FrameInfo.cs
+++ b/src/ImageSharp/Formats/Heif/Av1/Tiling/Av1FrameInfo.cs
@@ -60,6 +60,12 @@ internal partial class Av1FrameInfo
             {
                 Point point = new(x, y);
                 this.superblockInfos[i] = new(this, point);
+                for (int j = 0; j < this.modeInfoCountPerSuperblock; j++)
+                {
+                    this.transformInfosY[j] = new Av1TransformInfo();
+                    this.transformInfosUv[j] = new Av1TransformInfo();
+                }
+
                 i++;
             }
         }
diff --git a/src/ImageSharp/Formats/Heif/Av1/Tiling/Av1TransformInfo.cs b/src/ImageSharp/Formats/Heif/Av1/Tiling/Av1TransformInfo.cs
index 3f79f90244..dab777ed3d 100644
--- a/src/ImageSharp/Formats/Heif/Av1/Tiling/Av1TransformInfo.cs
+++ b/src/ImageSharp/Formats/Heif/Av1/Tiling/Av1TransformInfo.cs
@@ -10,6 +10,14 @@ namespace SixLabors.ImageSharp.Formats.Heif.Av1.Tiling;
 /// </summary>
 internal class Av1TransformInfo
 {
+    /// <summary>
+    /// Initializes a new instance of the <see cref="Av1TransformInfo"/> class.
+    /// </summary>
+    public Av1TransformInfo()
+        : this(Av1TransformSize.Size4x4, 0, 0)
+    {
+    }
+
     /// <summary>
     /// Initializes a new instance of the <see cref="Av1TransformInfo"/> class.
     /// </summary>