fix primary ctor

src/ImageSharp/Formats/Ani/AniDecoderCore.cs

@@ -18,12 +18,12 @@ using SixLabors.ImageSharp.Metadata;
 
 namespace SixLabors.ImageSharp.Formats.Ani;
 
-internal class AniDecoderCore(DecoderOptions options) : ImageDecoderCore(options)
+internal class AniDecoderCore : ImageDecoderCore
 {
     /// <summary>
     /// The general decoder options.
     /// </summary>
-    private readonly Configuration configuration = options.Configuration;
+    private readonly Configuration configuration;
 
     /// <summary>
     /// The stream to decode from.
@@ -32,6 +32,10 @@ internal class AniDecoderCore(DecoderOptions options) : ImageDecoderCore(options
 
     private AniHeader header;
 
+    public AniDecoderCore(DecoderOptions options)
+        : base(options) =>
+        this.configuration = options.Configuration;
+
     private enum ListIconChunkType : byte
     {
         Ico = 1,

src/ImageSharp/Formats/Icon/IconDir.cs

@@ -7,30 +7,37 @@ using System.Runtime.InteropServices;
 namespace SixLabors.ImageSharp.Formats.Icon;
 
 [StructLayout(LayoutKind.Sequential, Pack = 1, Size = Size)]
-internal struct IconDir(ushort reserved, IconFileType type, ushort count)
+internal struct IconDir
 {
     public const int Size = 3 * sizeof(ushort);
 
     /// <summary>
     /// Reserved. Must always be 0.
     /// </summary>
-    public ushort Reserved = reserved;
+    public ushort Reserved;
 
     /// <summary>
     /// Specifies image type: 1 for icon (.ICO) image, 2 for cursor (.CUR) image. Other values are invalid.
     /// </summary>
-    public IconFileType Type = type;
+    public IconFileType Type;
 
     /// <summary>
     /// Specifies number of images in the file.
     /// </summary>
-    public ushort Count = count;
+    public ushort Count;
 
     public IconDir(IconFileType type, ushort count = 0)
         : this(0, type, count)
     {
     }
 
+    public IconDir(ushort reserved, IconFileType type, ushort count)
+    {
+        this.Reserved = reserved;
+        this.Type = type;
+        this.Count = count;
+    }
+
     public static ref IconDir Parse(ReadOnlySpan<byte> data)
         => ref Unsafe.As<byte, IconDir>(ref MemoryMarshal.GetReference(data));