From cfdd95f0790013b241c4bc547d23aa7e058365ef Mon Sep 17 00:00:00 2001
From: Darth Affe <darthaffe@wyrez.org>
Date: Sun, 21 Jul 2024 17:29:14 +0200
Subject: [PATCH] Added Wrap-Methods to Image and RefImage for allocation free
 creation

---
 HPPH/Images/Image.cs    |  8 ++++++++
 HPPH/Images/RefImage.cs | 11 +++++++++++
 2 files changed, 19 insertions(+)

diff --git a/HPPH/Images/Image.cs b/HPPH/Images/Image.cs
index 6f9e79d..f221c15 100644
--- a/HPPH/Images/Image.cs
+++ b/HPPH/Images/Image.cs
@@ -125,6 +125,14 @@ public sealed class Image<T> : IImage<T>, IEquatable<Image<T>>
         return new Image<T>(data, 0, 0, width, height, stride);
     }
 
+    public static Image<T> Wrap(byte[] buffer, int width, int height, int stride)
+    {
+        if (stride < width) throw new ArgumentException("Stride can't be smaller than width.");
+        if (buffer.Length < (height * stride)) throw new ArgumentException("Not enough data in the buffer.");
+
+        return new Image<T>(buffer, 0, 0, width, height, stride);
+    }
+
     /// <inheritdoc />
     public IImage<TColor> ConvertTo<TColor>()
         where TColor : struct, IColor
diff --git a/HPPH/Images/RefImage.cs b/HPPH/Images/RefImage.cs
index 60c74ce..8772a10 100644
--- a/HPPH/Images/RefImage.cs
+++ b/HPPH/Images/RefImage.cs
@@ -86,6 +86,17 @@ public readonly ref struct RefImage<T>
 
     #region Methods
 
+    public static RefImage<T> Wrap(ReadOnlySpan<T> buffer, int width, int height)
+        => Wrap(MemoryMarshal.AsBytes(buffer), width, height, width * T.ColorFormat.BytesPerPixel);
+
+    public static RefImage<T> Wrap(ReadOnlySpan<byte> buffer, int width, int height, int stride)
+    {
+        if (stride < width) throw new ArgumentException("Stride can't be smaller than width.");
+        if (buffer.Length < (height * stride)) throw new ArgumentException("Not enough data in the buffer.");
+
+        return new RefImage<T>(buffer, 0, 0, width, height, stride);
+    }
+
     /// <summary>
     /// Copies the contents of this <see cref="RefImage{T}"/> into a destination <see cref="Span{T}"/> instance.
     /// </summary>