Add ICC profile span input

src/ImageSharp/Formats/Heif/HeifPropertyParser.cs

@@ -43,11 +43,9 @@ internal static class HeifPropertyParser
             throw new InvalidImageContentException("The HEIF ICC color property contains an empty profile.");
         }
 
-        // IccProfile retains its input array while the HEIF box-reader buffer is pooled and reused. Perform the one
-        // required ownership transfer here so item and sequence parsing cannot introduce additional materializations.
-        byte[] ownedData = GC.AllocateUninitializedArray<byte>(data.Length);
-        data.CopyTo(ownedData);
-        IccProfile profile = new(ownedData);
+        // The source belongs to a pooled box-reader buffer. The span constructor performs the single ownership transfer
+        // required for the profile to retain its exact bytes after that buffer is returned and reused.
+        IccProfile profile = new(data);
         if (!profile.CheckIsValid())
         {
             throw new InvalidIccProfileException("Invalid HEIF ICC profile.");

src/ImageSharp/Metadata/Profiles/ICC/IccProfile.cs

@@ -40,6 +40,19 @@ public sealed partial class IccProfile : IDeepCloneable<IccProfile>
     /// <param name="data">The raw ICC profile data</param>
     public IccProfile(byte[] data) => this.data = data;
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="IccProfile"/> class from raw ICC profile data whose source storage does not need to
+    /// remain valid for the lifetime of the profile.
+    /// </summary>
+    /// <param name="data">The raw ICC profile data.</param>
+    public IccProfile(ReadOnlySpan<byte> data)
+    {
+        // A span cannot transfer ownership, while IccProfile retains the exact bytes for lazy parsing and byte-for-byte serialization.
+        // The destination has exactly data.Length elements, so CopyTo immediately overwrites every byte of the uninitialized array.
+        this.data = GC.AllocateUninitializedArray<byte>(data.Length);
+        data.CopyTo(this.data);
+    }
+
     /// <summary>
     /// Initializes a new instance of the <see cref="IccProfile"/> class.
     /// </summary>