BulkPixelOperations<T> skeleton

src/ImageSharp/Colors/Color.cs

@@ -112,6 +112,9 @@ namespace ImageSharp
             this.packedValue = packed;
         }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Color> BulkOperations => new BulkPixelOperations<Color>();
+
         /// <summary>
         /// Gets or sets the red component.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Alpha8.cs

@@ -26,6 +26,9 @@ namespace ImageSharp
         /// <inheritdoc />
         public byte PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Alpha8> BulkOperations => new BulkPixelOperations<Alpha8>();
+
         /// <summary>
         /// Compares two <see cref="Alpha8"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Argb.cs

@@ -109,6 +109,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public uint PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Argb> BulkOperations => new BulkPixelOperations<Argb>();
+
         /// <summary>
         /// Gets or sets the red component.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Bgr565.cs

@@ -39,6 +39,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ushort PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Bgr565> BulkOperations => new BulkPixelOperations<Bgr565>();
+
         /// <summary>
         /// Compares two <see cref="Bgr565"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Bgra4444.cs

@@ -38,6 +38,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ushort PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Bgra4444> BulkOperations => new BulkPixelOperations<Bgra4444>();
+
         /// <summary>
         /// Compares two <see cref="Bgra4444"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Bgra5551.cs

@@ -40,6 +40,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ushort PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Bgra5551> BulkOperations => new BulkPixelOperations<Bgra5551>();
+
         /// <summary>
         /// Compares two <see cref="Bgra5551"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/BulkPixelOperations.cs

@@ -0,0 +1,56 @@
+namespace ImageSharp
+{
+    using System.Numerics;
+
+    public unsafe class BulkPixelOperations<TColor>
+        where TColor : struct, IPixel<TColor>
+    {
+        public static BulkPixelOperations<TColor> Instance { get; } = default(TColor).BulkOperations;
+
+        internal virtual void PackFromVector4(
+            ArrayPointer<Vector4> sourceVectors,
+            ArrayPointer<TColor> destColors,
+            int count)
+        {
+        }
+
+        internal virtual void PackToVector4(
+            ArrayPointer<TColor> sourceColors,
+            ArrayPointer<Vector4> destVectors,
+            int count)
+        {
+        }
+
+        internal virtual void PackToXyzBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
+        {
+        }
+
+        internal virtual void PackFromXyzBytes(ArrayPointer<byte> sourceBytes, ArrayPointer<TColor> destColors, int count)
+        {
+        }
+
+        internal virtual void PackToXyzwBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
+        {
+        }
+
+        internal virtual void PackFromXyzwBytes(ArrayPointer<byte> sourceBytes, ArrayPointer<TColor> destColors, int count)
+        {
+        }
+        
+        internal virtual void PackToZyxBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
+        {
+        }
+
+        internal virtual void PackFromZyxBytes(ArrayPointer<byte> sourceBytes, ArrayPointer<TColor> destColors, int count)
+        {
+        }
+
+        internal virtual void PackToZyxwBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
+        {
+        }
+
+        internal virtual void PackFromZyxwBytes(ArrayPointer<byte> sourceBytes, ArrayPointer<TColor> destColors, int count)
+        {
+        }
+    }
+}

src/ImageSharp/Colors/PackedPixel/Byte4.cs

@@ -41,6 +41,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public uint PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Byte4> BulkOperations => new BulkPixelOperations<Byte4>();
+
         /// <summary>
         /// Compares two <see cref="Byte4"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/HalfSingle.cs

@@ -36,6 +36,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ushort PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<HalfSingle> BulkOperations => new BulkPixelOperations<HalfSingle>();
+
         /// <summary>
         /// Compares two <see cref="HalfSingle"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/HalfVector2.cs

@@ -45,6 +45,9 @@ namespace ImageSharp
 
         /// <inheritdoc/>
         public uint PackedValue { get; set; }
+        
+        /// <inheritdoc />
+        public BulkPixelOperations<HalfVector2> BulkOperations => new BulkPixelOperations<HalfVector2>();
 
         /// <summary>
         /// Compares two <see cref="HalfVector2"/> objects for equality.

src/ImageSharp/Colors/PackedPixel/HalfVector4.cs

@@ -49,6 +49,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ulong PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<HalfVector4> BulkOperations => new BulkPixelOperations<HalfVector4>();
+
         /// <summary>
         /// Compares two <see cref="HalfVector2"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/IPixel.cs

@@ -15,6 +15,10 @@ namespace ImageSharp
     public interface IPixel<TSelf> : IPixel, IEquatable<TSelf>
         where TSelf : struct, IPixel<TSelf>
     {
+        /// <summary>
+        /// Gets the <see cref="BulkPixelOperations{TColor}"/> instance for this pixel type.
+        /// </summary>
+        BulkPixelOperations<TSelf> BulkOperations { get; }
     }
 
     /// <summary>

src/ImageSharp/Colors/PackedPixel/NormalizedByte2.cs

@@ -51,6 +51,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ushort PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<NormalizedByte2> BulkOperations => new BulkPixelOperations<NormalizedByte2>();
+
         /// <summary>
         /// Compares two <see cref="NormalizedByte2"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/NormalizedByte4.cs

@@ -52,6 +52,9 @@ namespace ImageSharp
 
         /// <inheritdoc/>
         public uint PackedValue { get; set; }
+        
+        /// <inheritdoc />
+        public BulkPixelOperations<NormalizedByte4> BulkOperations => new BulkPixelOperations<NormalizedByte4>();
 
         /// <summary>
         /// Compares two <see cref="NormalizedByte4"/> objects for equality.

src/ImageSharp/Colors/PackedPixel/NormalizedShort2.cs

@@ -51,6 +51,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public uint PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<NormalizedShort2> BulkOperations => new BulkPixelOperations<NormalizedShort2>();
+
         /// <summary>
         /// Compares two <see cref="NormalizedShort2"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/NormalizedShort4.cs

@@ -53,6 +53,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ulong PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<NormalizedShort4> BulkOperations => new BulkPixelOperations<NormalizedShort4>();
+
         /// <summary>
         /// Compares two <see cref="NormalizedShort4"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Rg32.cs

@@ -36,6 +36,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public uint PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Rg32> BulkOperations => new BulkPixelOperations<Rg32>();
+
         /// <summary>
         /// Compares two <see cref="Rg32"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Rgba1010102.cs

@@ -39,6 +39,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public uint PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Rgba1010102> BulkOperations => new BulkPixelOperations<Rgba1010102>();
+
         /// <summary>
         /// Compares two <see cref="Rgba1010102"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Rgba64.cs

@@ -38,6 +38,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ulong PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Rgba64> BulkOperations => new BulkPixelOperations<Rgba64>();
+
         /// <summary>
         /// Compares two <see cref="Rgba64"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Short2.cs

@@ -51,6 +51,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public uint PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Short2> BulkOperations => new BulkPixelOperations<Short2>();
+
         /// <summary>
         /// Compares two <see cref="Short2"/> objects for equality.
         /// </summary>

src/ImageSharp/Colors/PackedPixel/Short4.cs

@@ -53,6 +53,9 @@ namespace ImageSharp
         /// <inheritdoc/>
         public ulong PackedValue { get; set; }
 
+        /// <inheritdoc />
+        public BulkPixelOperations<Short4> BulkOperations => new BulkPixelOperations<Short4>();
+
         /// <summary>
         /// Compares two <see cref="Short4"/> objects for equality.
         /// </summary>

src/ImageSharp/Common/Memory/ArrayPointer.cs

@@ -0,0 +1,50 @@
+namespace ImageSharp
+{
+    using System.Runtime.CompilerServices;
+
+    /// <summary>
+    /// Utility methods to <see cref="ArrayPointer{T}"/>
+    /// </summary>
+    internal static class ArrayPointer
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static unsafe void Copy<T>(ArrayPointer<T> source, ArrayPointer<T> destination, int count)
+            where T : struct
+        {
+            Unsafe.CopyBlock((void*)source.PointerAtOffset, (void*)destination.PointerAtOffset, USizeOf<T>(count));
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static unsafe void Copy<T>(ArrayPointer<T> source, ArrayPointer<byte> destination, int countInSource)
+            where T : struct
+        {
+            Unsafe.CopyBlock((void*)source.PointerAtOffset, (void*)destination.PointerAtOffset, USizeOf<T>(countInSource));
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static unsafe void Copy<T>(ArrayPointer<byte> source, ArrayPointer<T> destination, int countInDest)
+            where T : struct
+        {
+            Unsafe.CopyBlock((void*)source.PointerAtOffset, (void*)destination.PointerAtOffset, USizeOf<T>(countInDest));
+        }
+
+        /// <summary>
+        /// Gets the size of `count` elements in bytes.
+        /// </summary>
+        /// <param name="count">The count of the elements</param>
+        /// <returns>The size in bytes as int</returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static int SizeOf<T>(int count)
+            where T : struct => Unsafe.SizeOf<T>() * count;
+
+        /// <summary>
+        /// Gets the size of `count` elements in bytes as UInt32
+        /// </summary>
+        /// <param name="count">The count of the elements</param>
+        /// <returns>The size in bytes as UInt32</returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static uint USizeOf<T>(int count)
+            where T : struct
+            => (uint)SizeOf<T>(count);
+    }
+}

tests/ImageSharp.Benchmarks/General/ArrayCopy.cs

@@ -2,22 +2,23 @@
 // Copyright (c) James Jackson-South and contributors.
 // Licensed under the Apache License, Version 2.0.
 // </copyright>
-
 namespace ImageSharp.Benchmarks.General
 {
     using System;
     using System.Runtime.CompilerServices;
+    using System.Runtime.InteropServices;
 
     using BenchmarkDotNet.Attributes;
 
+    [Config(typeof(Config.Short))]
     public class ArrayCopy
     {
-        [Params(100, 1000, 10000)]
+        [Params(10, 100, 1000, 10000)]
         public int Count { get; set; }
 
-        private byte[] source;
+        byte[] source;
 
-        private byte[] destination;
+        byte[] destination;
 
         [Setup]
         public void SetUp()
@@ -42,6 +43,12 @@ namespace ImageSharp.Benchmarks.General
             }
         }
 
+        [Benchmark(Description = "Copy using Buffer.BlockCopy()")]
+        public void CopyUsingBufferBlockCopy()
+        {
+            Buffer.BlockCopy(this.source, 0, this.destination, 0, this.Count);
+        }
+
         [Benchmark(Description = "Copy using Buffer.MemoryCopy<T>")]
         public unsafe void CopyUsingBufferMemoryCopy()
         {
@@ -51,5 +58,15 @@ namespace ImageSharp.Benchmarks.General
                 Buffer.MemoryCopy(pinnedSource, pinnedDestination, this.Count, this.Count);
             }
         }
+
+
+        [Benchmark(Description = "Copy using Marshal.Copy<T>")]
+        public unsafe void CopyUsingMarshalCopy()
+        {
+            fixed (byte* pinnedDestination = this.destination)
+            {
+                Marshal.Copy(this.source, 0, (IntPtr)pinnedDestination, this.Count);
+            }
+        }
     }
 }

tests/ImageSharp.Tests/Colors/BulkPixelOperationsTests.cs

@@ -0,0 +1,104 @@
+namespace ImageSharp.Tests.Colors
+{
+    using System;
+
+    using Xunit;
+
+    public class BulkPixelOperationsTests
+    {
+        public class TypeParam<TColor>
+        {
+        }
+
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackFromVector4<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackToVector4<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackToXyzBytes<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackFromXyzBytes<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackToXyzwBytes<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackFromXyzwBytes<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackToZyxBytes<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackFromZyxBytes<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackToZyxwBytes<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+
+        [Theory]
+        [InlineData(default(TypeParam<Color>))]
+        [InlineData(default(TypeParam<Argb>))]
+        public virtual void PackFromZyxwBytes<TColor>(TypeParam<TColor> dummy)
+            where TColor : struct, IPixel<TColor>
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

tests/ImageSharp.Tests/Common/ArrayPointerTests.cs

@@ -3,6 +3,7 @@
 namespace ImageSharp.Tests.Common
 {
     using System;
+    using System.Runtime.CompilerServices;
 
     using Xunit;
 
@@ -10,18 +11,16 @@ namespace ImageSharp.Tests.Common
     {
         public struct Foo
         {
-#pragma warning disable CS0414
+            public int A;
-            private int a;
 
-            private double b;
+            public double B;
-#pragma warning restore CS0414
 
             internal static Foo[] CreateArray(int size)
             {
                 Foo[] result = new Foo[size];
                 for (int i = 0; i < size; i++)
                 {
-                    result[i] = new Foo() { a = i, b = i };
+                    result[i] = new Foo() { A = i, B = i };
                 }
                 return result;
             }
@@ -79,5 +78,90 @@ namespace ImageSharp.Tests.Common
                 Assert.Equal((IntPtr)(p + totalOffset), ap.PointerAtOffset);
             }
         }
+
+        public class Copy
+        {
+            [Theory]
+            [InlineData(4)]
+            [InlineData(1500)]
+            public void GenericToOwnType(int count)
+            {
+                Foo[] source = Foo.CreateArray(count + 2);
+                Foo[] dest = new Foo[count + 5];
+
+                fixed (Foo* pSource = source)
+                fixed (Foo* pDest = dest)
+                {
+                    ArrayPointer<Foo> apSource = new ArrayPointer<Foo>(source, pSource);
+                    ArrayPointer<Foo> apDest = new ArrayPointer<Foo>(dest, pDest);
+
+                    ArrayPointer.Copy(apSource, apDest, count);
+                }
+
+                Assert.Equal(source[0], dest[0]);
+                Assert.Equal(source[count-1], dest[count-1]);
+                Assert.NotEqual(source[count], dest[count]);
+            }
+            
+            [Theory]
+            [InlineData(4)]
+            [InlineData(1500)]
+            public void GenericToBytes(int count)
+            {
+                int destCount = count * sizeof(Foo);
+                Foo[] source = Foo.CreateArray(count + 2);
+                byte[] dest = new byte[destCount + sizeof(Foo) + 1];
+
+                fixed (Foo* pSource = source)
+                fixed (byte* pDest = dest)
+                {
+                    ArrayPointer<Foo> apSource = new ArrayPointer<Foo>(source, pSource);
+                    ArrayPointer<byte> apDest = new ArrayPointer<byte>(dest, pDest);
+
+                    ArrayPointer.Copy(apSource, apDest, count);
+                }
+
+                Assert.True(ElementsAreEqual(source, dest, 0));
+                Assert.True(ElementsAreEqual(source, dest, count - 1));
+                Assert.False(ElementsAreEqual(source, dest, count));
+            }
+
+            [Theory]
+            [InlineData(4)]
+            [InlineData(1500)]
+            public void BytesToGeneric(int count)
+            {
+                int destCount = count * sizeof(Foo);
+                byte[] source = new byte[destCount + sizeof(Foo) + 1];
+                Foo[] dest = Foo.CreateArray(count + 2);
+                
+                fixed(byte* pSource = source)
+                fixed (Foo* pDest = dest)
+                {
+                    ArrayPointer<byte> apSource = new ArrayPointer<byte>(source, pSource);
+                    ArrayPointer<Foo> apDest = new ArrayPointer<Foo>(dest, pDest);
+
+                    ArrayPointer.Copy(apSource, apDest, count);
+                }
+
+                Assert.True(ElementsAreEqual(dest, source, 0));
+                Assert.True(ElementsAreEqual(dest, source, count - 1));
+                Assert.False(ElementsAreEqual(dest, source, count));
+            }
+            
+            private static bool ElementsAreEqual(Foo[] array, byte[] rawArray, int index)
+            {
+                fixed (Foo* pArray = array)
+                fixed (byte* pRaw = rawArray)
+                {
+                    Foo* pCasted = (Foo*)pRaw;
+
+                    Foo val1 = pArray[index];
+                    Foo val2 = pCasted[index];
+
+                    return val1.Equals(val2);
+                }
+            }
+        }
     }
 }