Switched to ThumbHasher over BlurHasher

ThumbHash/Models/SpanOwner.cs

@@ -0,0 +1,53 @@
+using System.Buffers;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace View_by_Distance.ThumbHash.Models;
+
+internal readonly ref struct SpanOwner<T>
+{
+
+    private static ArrayPool<T> DefaultPool
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => ArrayPool<T>.Shared;
+    }
+
+    private readonly T[] _Buffer;
+    private readonly int _Length;
+
+    public static SpanOwner<T> Empty
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => new(0);
+    }
+
+    public Span<T> Span
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get
+        {
+            ref T r0 = ref MemoryMarshal.GetArrayDataReference(_Buffer);
+            return MemoryMarshal.CreateSpan(ref r0, _Length);
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public SpanOwner<T> WithLength(int length) => new(length, _Buffer);
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public SpanOwner(int length) : this(length, DefaultPool.Rent(length))
+    { }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private SpanOwner(int length, T[] buffer)
+    {
+        _Length = length;
+        _Buffer = buffer;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public void Dispose() =>
+        DefaultPool.Return(_Buffer);
+
+}