Merge remote-tracking branch 'remotes/origin/master' into 2017-v2

# Conflicts:
#	src/ImageSharp/project.json

.gitignore

@@ -215,4 +215,5 @@ artifacts/
 *.csproj.bak
 
 #CodeCoverage
-**/CodeCoverage/*
+**/CodeCoverage/*
+docs/

codecov.yml

@@ -0,0 +1,4 @@
+ignore:
+  "src/ImageSharp/Common/Helpers/DebugGuard.cs"
+
+  

config.wyam

@@ -0,0 +1,4 @@
+#recipe Docs
+Settings[Keys.Host] = "imagesharp.org";
+Settings[Keys.Title] = "Image Sharp";
+FileSystem.OutputPath = "./docs";

input/about.md

@@ -0,0 +1,3 @@
+Title: About This Project
+---
+This project is awesome!

src/ImageSharp/Colors/Color.BulkOperations.cs

@@ -0,0 +1,249 @@
+// <copyright file="Color.BulkOperations.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp
+{
+    using System;
+    using System.Numerics;
+    using System.Runtime.CompilerServices;
+    using System.Runtime.InteropServices;
+
+    /// <content>
+    /// Conains the definition of <see cref="BulkOperations"/>
+    /// </content>
+    public partial struct Color
+    {
+        /// <summary>
+        /// <see cref="BulkPixelOperations{TColor}"/> implementation optimized for <see cref="Color"/>.
+        /// </summary>
+        internal class BulkOperations : BulkPixelOperations<Color>
+        {
+            /// <summary>
+            /// SIMD optimized bulk implementation of <see cref="IPixel.PackFromVector4(Vector4)"/>
+            /// that works only with `count` divisible by <see cref="Vector{UInt32}.Count"/>.
+            /// </summary>
+            /// <param name="sourceColors">The <see cref="BufferPointer{T}"/> to the source colors.</param>
+            /// <param name="destVectors">The <see cref="BufferPointer{T}"/> to the dstination vectors.</param>
+            /// <param name="count">The number of pixels to convert.</param>
+            /// <remarks>
+            /// Implementation adapted from:
+            /// <see>
+            ///     <cref>http://stackoverflow.com/a/5362789</cref>
+            /// </see>
+            /// TODO: We can replace this implementation in the future using new Vector API-s:
+            /// <see>
+            ///     <cref>https://github.com/dotnet/corefx/issues/15957</cref>
+            /// </see>
+            /// </remarks>
+            internal static unsafe void ToVector4SimdAligned(
+                BufferPointer<Color> sourceColors,
+                BufferPointer<Vector4> destVectors,
+                int count)
+            {
+                int vecSize = Vector<uint>.Count;
+
+                DebugGuard.IsTrue(
+                    count % vecSize == 0,
+                    nameof(count),
+                    "Argument 'count' should divisible by Vector<uint>.Count!");
+
+                Vector<float> bVec = new Vector<float>(256.0f / 255.0f);
+                Vector<float> magicFloat = new Vector<float>(32768.0f);
+                Vector<uint> magicInt = new Vector<uint>(1191182336); // reinterpreded value of 32768.0f
+                Vector<uint> mask = new Vector<uint>(255);
+
+                int unpackedRawCount = count * 4;
+
+                uint* src = (uint*)sourceColors.PointerAtOffset;
+                uint* srcEnd = src + count;
+
+                using (PinnedBuffer<uint> tempBuf = new PinnedBuffer<uint>(
+                        unpackedRawCount + Vector<uint>.Count))
+                {
+                    uint* tPtr = (uint*)tempBuf.Pointer;
+                    uint[] temp = tempBuf.Array;
+                    float[] fTemp = Unsafe.As<float[]>(temp);
+                    UnpackedRGBA* dst = (UnpackedRGBA*)tPtr;
+
+                    for (; src < srcEnd; src++, dst++)
+                    {
+                        // This call is the bottleneck now:
+                        dst->Load(*src);
+                    }
+
+                    for (int i = 0; i < unpackedRawCount; i += vecSize)
+                    {
+                        Vector<uint> vi = new Vector<uint>(temp, i);
+
+                        vi &= mask;
+                        vi |= magicInt;
+
+                        Vector<float> vf = Vector.AsVectorSingle(vi);
+                        vf = (vf - magicFloat) * bVec;
+                        vf.CopyTo(fTemp, i);
+                    }
+
+                    BufferPointer.Copy<uint>(tempBuf, (BufferPointer<byte>)destVectors, unpackedRawCount);
+                }
+            }
+
+            /// <inheritdoc />
+            internal override void ToVector4(BufferPointer<Color> sourceColors, BufferPointer<Vector4> destVectors, int count)
+            {
+                if (count < 256)
+                {
+                    // Doesn't worth to bother with SIMD:
+                    base.ToVector4(sourceColors, destVectors, count);
+                    return;
+                }
+
+                int remainder = count % Vector<uint>.Count;
+
+                int alignedCount = count - remainder;
+
+                if (alignedCount > 0)
+                {
+                    ToVector4SimdAligned(sourceColors, destVectors, alignedCount);
+                }
+
+                if (remainder > 0)
+                {
+                    sourceColors = sourceColors.Slice(alignedCount);
+                    destVectors = destVectors.Slice(alignedCount);
+                    base.ToVector4(sourceColors, destVectors, remainder);
+                }
+            }
+
+            /// <inheritdoc />
+            internal override unsafe void PackFromXyzBytes(BufferPointer<byte> sourceBytes, BufferPointer<Color> destColors, int count)
+            {
+                byte* source = (byte*)sourceBytes;
+                byte* destination = (byte*)destColors;
+
+                for (int x = 0; x < count; x++)
+                {
+                    Unsafe.Write(destination, (uint)(*source << 0 | *(source + 1) << 8 | *(source + 2) << 16 | 255 << 24));
+
+                    source += 3;
+                    destination += 4;
+                }
+            }
+
+            /// <inheritdoc />
+            internal override unsafe void ToXyzBytes(BufferPointer<Color> sourceColors, BufferPointer<byte> destBytes, int count)
+            {
+                byte* source = (byte*)sourceColors;
+                byte* destination = (byte*)destBytes;
+
+                for (int x = 0; x < count; x++)
+                {
+                    *destination = *(source + 0);
+                    *(destination + 1) = *(source + 1);
+                    *(destination + 2) = *(source + 2);
+
+                    source += 4;
+                    destination += 3;
+                }
+            }
+
+            /// <inheritdoc />
+            internal override void PackFromXyzwBytes(BufferPointer<byte> sourceBytes, BufferPointer<Color> destColors, int count)
+            {
+                BufferPointer.Copy(sourceBytes, destColors, count);
+            }
+
+            /// <inheritdoc />
+            internal override void ToXyzwBytes(BufferPointer<Color> sourceColors, BufferPointer<byte> destBytes, int count)
+            {
+                BufferPointer.Copy(sourceColors, destBytes, count);
+            }
+
+            /// <inheritdoc />
+            internal override unsafe void PackFromZyxBytes(BufferPointer<byte> sourceBytes, BufferPointer<Color> destColors, int count)
+            {
+                byte* source = (byte*)sourceBytes;
+                byte* destination = (byte*)destColors;
+
+                for (int x = 0; x < count; x++)
+                {
+                    Unsafe.Write(destination, (uint)(*(source + 2) << 0 | *(source + 1) << 8 | *source << 16 | 255 << 24));
+
+                    source += 3;
+                    destination += 4;
+                }
+            }
+
+            /// <inheritdoc />
+            internal override unsafe void ToZyxBytes(BufferPointer<Color> sourceColors, BufferPointer<byte> destBytes, int count)
+            {
+                byte* source = (byte*)sourceColors;
+                byte* destination = (byte*)destBytes;
+
+                for (int x = 0; x < count; x++)
+                {
+                    *destination = *(source + 2);
+                    *(destination + 1) = *(source + 1);
+                    *(destination + 2) = *(source + 0);
+
+                    source += 4;
+                    destination += 3;
+                }
+            }
+
+            /// <inheritdoc />
+            internal override unsafe void PackFromZyxwBytes(BufferPointer<byte> sourceBytes, BufferPointer<Color> destColors, int count)
+            {
+                byte* source = (byte*)sourceBytes;
+                byte* destination = (byte*)destColors;
+
+                for (int x = 0; x < count; x++)
+                {
+                    Unsafe.Write(destination, (uint)(*(source + 2) << 0 | *(source + 1) << 8 | *source << 16 | *(source + 3) << 24));
+
+                    source += 4;
+                    destination += 4;
+                }
+            }
+
+            /// <inheritdoc />
+            internal override unsafe void ToZyxwBytes(BufferPointer<Color> sourceColors, BufferPointer<byte> destBytes, int count)
+            {
+                byte* source = (byte*)sourceColors;
+                byte* destination = (byte*)destBytes;
+
+                for (int x = 0; x < count; x++)
+                {
+                    *destination = *(source + 2);
+                    *(destination + 1) = *(source + 1);
+                    *(destination + 2) = *(source + 0);
+                    *(destination + 3) = *(source + 3);
+
+                    source += 4;
+                    destination += 4;
+                }
+            }
+
+            /// <summary>
+            /// Value type to store <see cref="Color"/>-s unpacked into multiple <see cref="uint"/>-s.
+            /// </summary>
+            private struct UnpackedRGBA
+            {
+                private uint r;
+                private uint g;
+                private uint b;
+                private uint a;
+
+                [MethodImpl(MethodImplOptions.AggressiveInlining)]
+                public void Load(uint p)
+                {
+                    this.r = p;
+                    this.g = p >> Color.GreenShift;
+                    this.b = p >> Color.BlueShift;
+                    this.a = p >> Color.AlphaShift;
+                }
+            }
+        }
+    }
+}

src/ImageSharp/Colors/Color.cs

@@ -246,7 +246,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc />
-        public BulkPixelOperations<Color> CreateBulkOperations() => new BulkPixelOperations<Color>();
+        public BulkPixelOperations<Color> CreateBulkOperations() => new Color.BulkOperations();
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]

src/ImageSharp/Common/Helpers/DebugGuard.cs

@@ -29,5 +29,135 @@ namespace ImageSharp
                 throw new ArgumentNullException(parameterName);
             }
         }
+
+        /// <summary>
+        /// Verifies that the specified value is less than a maximum value
+        /// and throws an exception if it is not.
+        /// </summary>
+        /// <param name="value">The target value, which should be validated.</param>
+        /// <param name="max">The maximum value.</param>
+        /// <param name="parameterName">The name of the parameter that is to be checked.</param>
+        /// <typeparam name="TValue">The type of the value.</typeparam>
+        /// <exception cref="ArgumentException">
+        /// <paramref name="value"/> is greater than the maximum value.
+        /// </exception>
+        [Conditional("DEBUG")]
+        public static void MustBeLessThan<TValue>(TValue value, TValue max, string parameterName)
+                    where TValue : IComparable<TValue>
+        {
+            if (value.CompareTo(max) >= 0)
+            {
+                throw new ArgumentOutOfRangeException(parameterName, $"Value must be less than {max}.");
+            }
+        }
+
+        /// <summary>
+        /// Verifies that the specified value is less than or equal to a maximum value
+        /// and throws an exception if it is not.
+        /// </summary>
+        /// <param name="value">The target value, which should be validated.</param>
+        /// <param name="max">The maximum value.</param>
+        /// <param name="parameterName">The name of the parameter that is to be checked.</param>
+        /// <typeparam name="TValue">The type of the value.</typeparam>
+        /// <exception cref="ArgumentException">
+        /// <paramref name="value"/> is greater than the maximum value.
+        /// </exception>
+        [Conditional("DEBUG")]
+        public static void MustBeLessThanOrEqualTo<TValue>(TValue value, TValue max, string parameterName)
+                    where TValue : IComparable<TValue>
+        {
+            if (value.CompareTo(max) > 0)
+            {
+                throw new ArgumentOutOfRangeException(parameterName, $"Value must be less than or equal to {max}.");
+            }
+        }
+
+        /// <summary>
+        /// Verifies that the specified value is greater than a minimum value
+        /// and throws an exception if it is not.
+        /// </summary>
+        /// <param name="value">The target value, which should be validated.</param>
+        /// <param name="min">The minimum value.</param>
+        /// <param name="parameterName">The name of the parameter that is to be checked.</param>
+        /// <typeparam name="TValue">The type of the value.</typeparam>
+        /// <exception cref="ArgumentException">
+        /// <paramref name="value"/> is less than the minimum value.
+        /// </exception>
+        [Conditional("DEBUG")]
+        public static void MustBeGreaterThan<TValue>(TValue value, TValue min, string parameterName)
+            where TValue : IComparable<TValue>
+        {
+            if (value.CompareTo(min) <= 0)
+            {
+                throw new ArgumentOutOfRangeException(
+                    parameterName,
+                    $"Value must be greater than {min}.");
+            }
+        }
+
+        /// <summary>
+        /// Verifies that the specified value is greater than or equal to a minimum value
+        /// and throws an exception if it is not.
+        /// </summary>
+        /// <param name="value">The target value, which should be validated.</param>
+        /// <param name="min">The minimum value.</param>
+        /// <param name="parameterName">The name of the parameter that is to be checked.</param>
+        /// <typeparam name="TValue">The type of the value.</typeparam>
+        /// <exception cref="ArgumentException">
+        /// <paramref name="value"/> is less than the minimum value.
+        /// </exception>
+        [Conditional("DEBUG")]
+        public static void MustBeGreaterThanOrEqualTo<TValue>(TValue value, TValue min, string parameterName)
+            where TValue : IComparable<TValue>
+        {
+            if (value.CompareTo(min) < 0)
+            {
+                throw new ArgumentOutOfRangeException(parameterName, $"Value must be greater than or equal to {min}.");
+            }
+        }
+
+        /// <summary>
+        /// Verifies, that the method parameter with specified target value is true
+        /// and throws an exception if it is found to be so.
+        /// </summary>
+        /// <param name="target">
+        /// The target value, which cannot be false.
+        /// </param>
+        /// <param name="parameterName">
+        /// The name of the parameter that is to be checked.
+        /// </param>
+        /// <param name="message">
+        /// The error message, if any to add to the exception.
+        /// </param>
+        /// <exception cref="ArgumentException">
+        /// <paramref name="target"/> is false
+        /// </exception>
+        [Conditional("DEBUG")]
+        public static void IsTrue(bool target, string parameterName, string message)
+        {
+            if (!target)
+            {
+                throw new ArgumentException(message, parameterName);
+            }
+        }
+
+        /// <summary>
+        /// Verifies, that the method parameter with specified target value is false
+        /// and throws an exception if it is found to be so.
+        /// </summary>
+        /// <param name="target">The target value, which cannot be true.</param>
+        /// <param name="parameterName">The name of the parameter that is to be checked.</param>
+        /// <param name="message">The error message, if any to add to the exception.</param>
+        /// <exception cref="ArgumentException">
+        /// <paramref name="target"/> is true
+        /// </exception>
+        [Conditional("DEBUG")]
+        public static void IsFalse(bool target, string parameterName, string message)
+        {
+            if (target)
+            {
+                throw new ArgumentException(message, parameterName);
+            }
+        }
     }
 }

src/ImageSharp/Common/Memory/BufferPointer.cs

@@ -5,7 +5,10 @@
 
 namespace ImageSharp
 {
+    using System;
+    using System.Numerics;
     using System.Runtime.CompilerServices;
+    using System.Runtime.InteropServices;
 
     /// <summary>
     /// Utility methods for <see cref="BufferPointer{T}"/>
@@ -13,17 +16,9 @@ namespace ImageSharp
     internal static class BufferPointer
     {
         /// <summary>
-        /// Gets a <see cref="BufferPointer{T}"/> to the beginning of the raw data in 'buffer'.
+        /// It's worth to use Marshal.Copy() or Buffer.BlockCopy() over this size.
         /// </summary>
-        /// <typeparam name="T">The element type</typeparam>
+        private const int ByteCountThreshold = 1024;
-        /// <param name="buffer">The input <see cref="PinnedBuffer{T}"/></param>
-        /// <returns>The <see cref="BufferPointer{T}"/></returns>
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static unsafe BufferPointer<T> Slice<T>(this PinnedBuffer<T> buffer)
-            where T : struct
-        {
-            return new BufferPointer<T>(buffer.Array, (void*)buffer.Pointer);
-        }
 
         /// <summary>
         /// Copy 'count' number of elements of the same type from 'source' to 'dest'
@@ -33,10 +28,10 @@ namespace ImageSharp
         /// <param name="destination">The destination <see cref="BufferPointer{T}"/>.</param>
         /// <param name="count">The number of elements to copy</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static unsafe void Copy<T>(BufferPointer<T> source, BufferPointer<T> destination, int count)
+        public static void Copy<T>(BufferPointer<T> source, BufferPointer<T> destination, int count)
             where T : struct
         {
-            Unsafe.CopyBlock((void*)source.PointerAtOffset, (void*)destination.PointerAtOffset, USizeOf<T>(count));
+            CopyImpl(source, destination, count);
         }
 
         /// <summary>
@@ -47,10 +42,10 @@ namespace ImageSharp
         /// <param name="destination">The destination buffer.</param>
         /// <param name="countInSource">The number of elements to copy from 'source'</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static unsafe void Copy<T>(BufferPointer<T> source, BufferPointer<byte> destination, int countInSource)
+        public static void Copy<T>(BufferPointer<T> source, BufferPointer<byte> destination, int countInSource)
             where T : struct
         {
-            Unsafe.CopyBlock((void*)source.PointerAtOffset, (void*)destination.PointerAtOffset, USizeOf<T>(countInSource));
+            CopyImpl(source, destination, countInSource);
         }
 
         /// <summary>
@@ -64,7 +59,16 @@ namespace ImageSharp
         public static unsafe void Copy<T>(BufferPointer<byte> source, BufferPointer<T> destination, int countInDest)
             where T : struct
         {
-            Unsafe.CopyBlock((void*)source.PointerAtOffset, (void*)destination.PointerAtOffset, USizeOf<T>(countInDest));
+            int byteCount = SizeOf<T>(countInDest);
+
+            if (byteCount > (int)ByteCountThreshold)
+            {
+                Marshal.Copy(source.Array, source.Offset, destination.PointerAtOffset, byteCount);
+            }
+            else
+            {
+                Unsafe.CopyBlock((void*)destination.PointerAtOffset, (void*)source.PointerAtOffset, (uint)byteCount);
+            }
         }
 
         /// <summary>
@@ -87,5 +91,39 @@ namespace ImageSharp
         public static uint USizeOf<T>(int count)
             where T : struct
             => (uint)SizeOf<T>(count);
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static unsafe void CopyImpl<T, TDest>(BufferPointer<T> source, BufferPointer<TDest> destination, int count)
+            where T : struct
+            where TDest : struct
+        {
+            int byteCount = SizeOf<T>(count);
+
+            if (byteCount > ByteCountThreshold)
+            {
+                if (Unsafe.SizeOf<T>() == sizeof(long))
+                {
+                    Marshal.Copy(Unsafe.As<long[]>(source.Array), source.Offset, destination.PointerAtOffset, count);
+                    return;
+                }
+                else if (Unsafe.SizeOf<T>() == sizeof(int))
+                {
+                    Marshal.Copy(Unsafe.As<int[]>(source.Array), source.Offset, destination.PointerAtOffset, count);
+                    return;
+                }
+                else if (Unsafe.SizeOf<T>() == sizeof(short))
+                {
+                    Marshal.Copy(Unsafe.As<short[]>(source.Array), source.Offset, destination.PointerAtOffset, count);
+                    return;
+                }
+                else if (Unsafe.SizeOf<T>() == sizeof(byte))
+                {
+                    Marshal.Copy(Unsafe.As<byte[]>(source.Array), source.Offset, destination.PointerAtOffset, count);
+                    return;
+                }
+            }
+
+            Unsafe.CopyBlock((void*)destination.PointerAtOffset, (void*)source.PointerAtOffset, (uint)byteCount);
+        }
     }
 }

src/ImageSharp/Common/Memory/BufferPointer{T}.cs

@@ -63,6 +63,11 @@ namespace ImageSharp
         /// </summary>
         public int Offset { get; private set; }
 
+        /// <summary>
+        /// Gets the offset inside <see cref="Array"/> in bytes.
+        /// </summary>
+        public int ByteOffset => this.Offset * Unsafe.SizeOf<T>();
+
         /// <summary>
         /// Gets the pointer to the offseted array position
         /// </summary>
@@ -79,7 +84,7 @@ namespace ImageSharp
         }
 
         /// <summary>
-        /// Convertes <see cref="BufferPointer{T}"/> instance to a raw 'byte*' pointer
+        /// Converts <see cref="BufferPointer{T}"/> instance to a raw 'byte*' pointer
         /// </summary>
         /// <param name="bufferPointer">The <see cref="BufferPointer{T}"/> to convert</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -88,6 +93,21 @@ namespace ImageSharp
             return (byte*)bufferPointer.PointerAtOffset;
         }
 
+        /// <summary>
+        /// Converts <see cref="BufferPointer{T}"/> instance to <see cref="BufferPointer{Byte}"/>
+        /// setting it's <see cref="Offset"/> and <see cref="PointerAtOffset"/> to correct values.
+        /// </summary>
+        /// <param name="source">The <see cref="BufferPointer{T}"/> to convert</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static explicit operator BufferPointer<byte>(BufferPointer<T> source)
+        {
+            BufferPointer<byte> result = default(BufferPointer<byte>);
+            result.Array = Unsafe.As<byte[]>(source.Array);
+            result.Offset = source.Offset * Unsafe.SizeOf<T>();
+            result.PointerAtOffset = source.PointerAtOffset;
+            return result;
+        }
+
         /// <summary>
         /// Forms a slice out of the given BufferPointer, beginning at 'offset'.
         /// </summary>
@@ -102,5 +122,22 @@ namespace ImageSharp
             result.PointerAtOffset = this.PointerAtOffset + (Unsafe.SizeOf<T>() * offset);
             return result;
         }
+
+        /// <summary>
+        /// Clears `count` elements beginning from the pointed position.
+        /// </summary>
+        /// <param name="count">The number of elements to clear</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Clear(int count)
+        {
+            if (count < 256)
+            {
+                Unsafe.InitBlock((void*)this.PointerAtOffset, 0, BufferPointer.USizeOf<T>(count));
+            }
+            else
+            {
+                System.Array.Clear(this.Array, this.Offset, count);
+            }
+        }
     }
 }

src/ImageSharp/Common/Memory/PinnedBuffer{T}.cs

@@ -7,6 +7,7 @@ namespace ImageSharp
 {
     using System;
     using System.Buffers;
+    using System.Runtime.CompilerServices;
     using System.Runtime.InteropServices;
 
     /// <summary>
@@ -23,7 +24,8 @@ namespace ImageSharp
         private GCHandle handle;
 
         /// <summary>
-        /// A value indicating whether this <see cref="PinnedBuffer{T}"/> instance should return the array to the pool.
+        /// A value indicating wheter <see cref="Array"/> should be returned to <see cref="PixelDataPool{T}"/>
+        /// when disposing this <see cref="PinnedBuffer{T}"/> instance.
         /// </summary>
         private bool isPoolingOwner;
 
@@ -47,6 +49,7 @@ namespace ImageSharp
         {
             this.Count = array.Length;
             this.Array = array;
+            this.isPoolingOwner = false;
             this.Pin();
         }
 
@@ -64,6 +67,7 @@ namespace ImageSharp
 
             this.Count = count;
             this.Array = array;
+            this.isPoolingOwner = false;
             this.Pin();
         }
 
@@ -95,9 +99,41 @@ namespace ImageSharp
         /// </summary>
         public IntPtr Pointer { get; private set; }
 
+        /// <summary>
+        /// Converts <see cref="PinnedBuffer{T}"/> to an <see cref="BufferPointer{T}"/>.
+        /// </summary>
+        /// <param name="buffer">The <see cref="PinnedBuffer{T}"/> to convert.</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static implicit operator BufferPointer<T>(PinnedBuffer<T> buffer)
+        {
+            return buffer.Slice();
+        }
+
+        /// <summary>
+        /// Gets a <see cref="BufferPointer{T}"/> to the beginning of the raw data of the buffer.
+        /// </summary>
+        /// <returns>The <see cref="BufferPointer{T}"/></returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public unsafe BufferPointer<T> Slice()
+        {
+            return new BufferPointer<T>(this.Array, (void*)this.Pointer);
+        }
+
+        /// <summary>
+        /// Gets a <see cref="BufferPointer{T}"/> to an offseted position inside the buffer.
+        /// </summary>
+        /// <param name="offset">The offset</param>
+        /// <returns>The <see cref="BufferPointer{T}"/></returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public unsafe BufferPointer<T> Slice(int offset)
+        {
+            return new BufferPointer<T>(this.Array, (void*)this.Pointer, offset);
+        }
+
         /// <summary>
         /// Disposes the <see cref="PinnedBuffer{T}"/> instance by unpinning the array, and returning the pooled buffer when necessary.
         /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void Dispose()
         {
             if (this.IsDisposedOrLostArrayOwnership)
@@ -113,6 +149,7 @@ namespace ImageSharp
                 PixelDataPool<T>.Return(this.Array);
             }
 
+            this.isPoolingOwner = false;
             this.Array = null;
             this.Count = 0;
 
@@ -124,6 +161,7 @@ namespace ImageSharp
         /// If <see cref="Array"/> is rented, it's the callers responsibility to return it to it's pool. (Most likely <see cref="PixelDataPool{T}"/>)
         /// </summary>
         /// <returns>The unpinned <see cref="Array"/></returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public T[] UnPinAndTakeArrayOwnership()
         {
             if (this.IsDisposedOrLostArrayOwnership)
@@ -135,12 +173,23 @@ namespace ImageSharp
             this.UnPin();
             T[] array = this.Array;
             this.Array = null;
+            this.isPoolingOwner = false;
             return array;
         }
 
+        /// <summary>
+        /// Clears the buffer, filling elements between 0 and <see cref="Count"/>-1 with default(T)
+        /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Clear()
+        {
+            this.Slice().Clear(this.Count);
+        }
+
         /// <summary>
         /// Pins <see cref="Array"/>.
         /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private void Pin()
         {
             this.handle = GCHandle.Alloc(this.Array, GCHandleType.Pinned);
@@ -150,6 +199,7 @@ namespace ImageSharp
         /// <summary>
         /// Unpins <see cref="Array"/>.
         /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private void UnPin()
         {
             if (this.Pointer == IntPtr.Zero || !this.handle.IsAllocated)

src/ImageSharp/Common/Memory/PixelDataPool{T}.cs

@@ -9,15 +9,14 @@ namespace ImageSharp
     using System.Buffers;
 
     /// <summary>
-    /// Provides a resource pool that enables reusing instances of value type arrays <see cref="T:T[]"/>.
+    /// Provides a resource pool that enables reusing instances of value type arrays for image data <see cref="T:T[]"/>.
-    /// <see cref="Rent(int)"/> will always return arrays initialized with 'default(T)'
     /// </summary>
     /// <typeparam name="T">The value type.</typeparam>
-    public static class PixelDataPool<T>
+    public class PixelDataPool<T>
         where T : struct
     {
         /// <summary>
-        /// The <see cref="ArrayPool{T}"/> used to pool data.
+        /// The <see cref="ArrayPool{T}"/> which is not kept clean.
         /// </summary>
         private static readonly ArrayPool<T> ArrayPool = ArrayPool<T>.Create(CalculateMaxArrayLength(), 50);
 
@@ -37,11 +36,11 @@ namespace ImageSharp
         /// <param name="array">The array to return to the buffer pool.</param>
         public static void Return(T[] array)
         {
-            ArrayPool.Return(array, true);
+            ArrayPool.Return(array);
         }
 
         /// <summary>
-        /// Heuristically calculates a reasonable maxArrayLength value for the backing <see cref="ArrayPool"/>.
+        /// Heuristically calculates a reasonable maxArrayLength value for the backing <see cref="ArrayPool{T}"/>.
         /// </summary>
         /// <returns>The maxArrayLength value</returns>
         internal static int CalculateMaxArrayLength()

src/ImageSharp/Image.cs

@@ -223,17 +223,5 @@ namespace ImageSharp
             : base(other)
         {
         }
-
-        /// <inheritdoc />
-        public override PixelAccessor<Color> Lock()
-        {
-            return new PixelAccessor(this);
-        }
-
-        /// <inheritdoc />
-        internal override ImageFrame<Color> ToFrame()
-        {
-            return new ImageFrame(this);
-        }
     }
 }

src/ImageSharp/Image/ImageBase{TColor}.cs

@@ -60,6 +60,7 @@ namespace ImageSharp
         {
             this.Configuration = configuration ?? Configuration.Default;
             this.InitPixels(width, height);
+            this.ClearPixels();
         }
 
         /// <summary>
@@ -150,7 +151,7 @@ namespace ImageSharp
         }
 
         /// <inheritdoc/>
-        public virtual PixelAccessor<TColor> Lock()
+        public PixelAccessor<TColor> Lock()
         {
             return new PixelAccessor<TColor>(this);
         }
@@ -232,5 +233,13 @@ namespace ImageSharp
             PixelDataPool<TColor>.Return(this.pixelBuffer);
             this.pixelBuffer = null;
         }
+
+        /// <summary>
+        /// Clears the pixel array.
+        /// </summary>
+        private void ClearPixels()
+        {
+            Array.Clear(this.pixelBuffer, 0, this.Width * this.Height);
+        }
     }
 }

src/ImageSharp/Image/PixelAccessor{TColor}.cs

@@ -15,7 +15,7 @@ namespace ImageSharp
     /// Provides per-pixel access to generic <see cref="Image{TColor}"/> pixels.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public unsafe class PixelAccessor<TColor> : IDisposable
+    public sealed unsafe class PixelAccessor<TColor> : IDisposable
         where TColor : struct, IPixel<TColor>
     {
         /// <summary>
@@ -91,7 +91,7 @@ namespace ImageSharp
         /// <summary>
         /// Gets the pixel buffer array.
         /// </summary>
-        public TColor[] PixelBuffer => this.pixelBuffer.Array;
+        public TColor[] PixelArray => this.pixelBuffer.Array;
 
         /// <summary>
         /// Gets the pointer to the pixel buffer.
@@ -123,6 +123,8 @@ namespace ImageSharp
         /// </summary>
         public ParallelOptions ParallelOptions { get; }
 
+        private static BulkPixelOperations<TColor> Operations => BulkPixelOperations<TColor>.Instance;
+
         /// <summary>
         /// Gets or sets the pixel at the specified position.
         /// </summary>
@@ -236,6 +238,17 @@ namespace ImageSharp
             Unsafe.InitBlock(this.pixelsBase, 0, (uint)(this.RowStride * this.Height));
         }
 
+        /// <summary>
+        /// Gets a <see cref="BufferPointer{TColor}"/> to the row 'y' beginning from the pixel at 'x'.
+        /// </summary>
+        /// <param name="x">The x coordinate</param>
+        /// <param name="y">The y coordinate</param>
+        /// <returns>The <see cref="BufferPointer{TColor}"/></returns>
+        internal BufferPointer<TColor> GetRowPointer(int x, int y)
+        {
+            return this.pixelBuffer.Slice((y * this.Width) + x);
+        }
+
         /// <summary>
         /// Sets the pixel buffer in an unsafe manner. This should not be used unless you know what its doing!!!
         /// </summary>
@@ -270,24 +283,15 @@ namespace ImageSharp
         /// <param name="targetY">The target row index.</param>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
-        protected virtual void CopyFromZyx(PixelArea<TColor> area, int targetX, int targetY, int width, int height)
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void CopyFromZyx(PixelArea<TColor> area, int targetX, int targetY, int width, int height)
         {
-            TColor packed = default(TColor);
-            int size = Unsafe.SizeOf<TColor>();
-
             for (int y = 0; y < height; y++)
             {
-                byte* source = area.PixelBase + (y * area.RowStride);
+                BufferPointer<byte> source = area.GetRowPointer(y);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
+                BufferPointer<TColor> destination = this.GetRowPointer(targetX, targetY + y);
-
-                for (int x = 0; x < width; x++)
-                {
-                    packed.PackFromBytes(*(source + 2), *(source + 1), *source, 255);
-                    Unsafe.Write(destination, packed);
 
-                    source += 3;
+                Operations.PackFromZyxBytes(source, destination, width);
-                    destination += size;
-                }
             }
         }
 
@@ -299,24 +303,15 @@ namespace ImageSharp
         /// <param name="targetY">The target row index.</param>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
-        protected virtual void CopyFromZyxw(PixelArea<TColor> area, int targetX, int targetY, int width, int height)
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void CopyFromZyxw(PixelArea<TColor> area, int targetX, int targetY, int width, int height)
         {
-            TColor packed = default(TColor);
-            int size = Unsafe.SizeOf<TColor>();
-
             for (int y = 0; y < height; y++)
             {
-                byte* source = area.PixelBase + (y * area.RowStride);
+                BufferPointer<byte> source = area.GetRowPointer(y);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
+                BufferPointer<TColor> destination = this.GetRowPointer(targetX, targetY + y);
-
-                for (int x = 0; x < width; x++)
-                {
-                    packed.PackFromBytes(*(source + 2), *(source + 1), *source, *(source + 3));
-                    Unsafe.Write(destination, packed);
 
-                    source += 4;
+                Operations.PackFromZyxwBytes(source, destination, width);
-                    destination += size;
-                }
             }
         }
 
@@ -328,24 +323,15 @@ namespace ImageSharp
         /// <param name="targetY">The target row index.</param>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
-        protected virtual void CopyFromXyz(PixelArea<TColor> area, int targetX, int targetY, int width, int height)
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void CopyFromXyz(PixelArea<TColor> area, int targetX, int targetY, int width, int height)
         {
-            TColor packed = default(TColor);
-            int size = Unsafe.SizeOf<TColor>();
-
             for (int y = 0; y < height; y++)
             {
-                byte* source = area.PixelBase + (y * area.RowStride);
+                BufferPointer<byte> source = area.GetRowPointer(y);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
+                BufferPointer<TColor> destination = this.GetRowPointer(targetX, targetY + y);
-
-                for (int x = 0; x < width; x++)
-                {
-                    packed.PackFromBytes(*source, *(source + 1), *(source + 2), 255);
-                    Unsafe.Write(destination, packed);
 
-                    source += 3;
+                Operations.PackFromXyzBytes(source, destination, width);
-                    destination += size;
-                }
             }
         }
 
@@ -357,24 +343,14 @@ namespace ImageSharp
         /// <param name="targetY">The target row index.</param>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
-        protected virtual void CopyFromXyzw(PixelArea<TColor> area, int targetX, int targetY, int width, int height)
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void CopyFromXyzw(PixelArea<TColor> area, int targetX, int targetY, int width, int height)
         {
-            TColor packed = default(TColor);
-            int size = Unsafe.SizeOf<TColor>();
-
             for (int y = 0; y < height; y++)
             {
-                byte* source = area.PixelBase + (y * area.RowStride);
+                BufferPointer<byte> source = area.GetRowPointer(y);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
+                BufferPointer<TColor> destination = this.GetRowPointer(targetX, targetY + y);
-
+                Operations.PackFromXyzwBytes(source, destination, width);
-                for (int x = 0; x < width; x++)
-                {
-                    packed.PackFromBytes(*source, *(source + 1), *(source + 2), *(source + 3));
-                    Unsafe.Write(destination, packed);
-
-                    source += 4;
-                    destination += size;
-                }
             }
         }
 
@@ -386,16 +362,14 @@ namespace ImageSharp
         /// <param name="sourceY">The source row index.</param>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
-        protected virtual void CopyToZyx(PixelArea<TColor> area, int sourceX, int sourceY, int width, int height)
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void CopyToZyx(PixelArea<TColor> area, int sourceX, int sourceY, int width, int height)
         {
             for (int y = 0; y < height; y++)
             {
-                int offset = y * area.RowStride;
+                BufferPointer<TColor> source = this.GetRowPointer(sourceX, sourceY + y);
-                for (int x = 0; x < width; x++)
+                BufferPointer<byte> destination = area.GetRowPointer(y);
-                {
+                Operations.ToZyxBytes(source, destination, width);
-                    this[sourceX + x, sourceY + y].ToZyxBytes(area.Bytes, offset);
-                    offset += 3;
-                }
             }
         }
 
@@ -407,16 +381,14 @@ namespace ImageSharp
         /// <param name="sourceY">The source row index.</param>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
-        protected virtual void CopyToZyxw(PixelArea<TColor> area, int sourceX, int sourceY, int width, int height)
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void CopyToZyxw(PixelArea<TColor> area, int sourceX, int sourceY, int width, int height)
         {
             for (int y = 0; y < height; y++)
             {
-                int offset = y * area.RowStride;
+                BufferPointer<TColor> source = this.GetRowPointer(sourceX, sourceY + y);
-                for (int x = 0; x < width; x++)
+                BufferPointer<byte> destination = area.GetRowPointer(y);
-                {
+                Operations.ToZyxwBytes(source, destination, width);
-                    this[sourceX + x, sourceY + y].ToZyxwBytes(area.Bytes, offset);
-                    offset += 4;
-                }
             }
         }
 
@@ -428,16 +400,14 @@ namespace ImageSharp
         /// <param name="sourceY">The source row index.</param>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
-        protected virtual void CopyToXyz(PixelArea<TColor> area, int sourceX, int sourceY, int width, int height)
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void CopyToXyz(PixelArea<TColor> area, int sourceX, int sourceY, int width, int height)
         {
             for (int y = 0; y < height; y++)
             {
-                int offset = y * area.RowStride;
+                BufferPointer<TColor> source = this.GetRowPointer(sourceX, sourceY + y);
-                for (int x = 0; x < width; x++)
+                BufferPointer<byte> destination = area.GetRowPointer(y);
-                {
+                Operations.ToXyzBytes(source, destination, width);
-                    this[sourceX + x, sourceY + y].ToXyzBytes(area.Bytes, offset);
-                    offset += 3;
-                }
             }
         }
 
@@ -449,32 +419,17 @@ namespace ImageSharp
         /// <param name="sourceY">The source row index.</param>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
-        protected virtual void CopyToXyzw(PixelArea<TColor> area, int sourceX, int sourceY, int width, int height)
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void CopyToXyzw(PixelArea<TColor> area, int sourceX, int sourceY, int width, int height)
         {
             for (int y = 0; y < height; y++)
             {
-                int offset = y * area.RowStride;
+                BufferPointer<TColor> source = this.GetRowPointer(sourceX, sourceY + y);
-                for (int x = 0; x < width; x++)
+                BufferPointer<byte> destination = area.GetRowPointer(y);
-                {
+                Operations.ToXyzwBytes(source, destination, width);
-                    this[sourceX + x, sourceY + y].ToXyzwBytes(area.Bytes, offset);
-                    offset += 4;
-                }
             }
         }
 
-        /// <summary>
-        /// Gets the pointer at the specified row.
-        /// </summary>
-        /// <param name="x">The column index.</param>
-        /// <param name="y">The row index.</param>
-        /// <returns>
-        /// The <see cref="T:byte*"/>.
-        /// </returns>
-        protected byte* GetRowPointer(int x, int y)
-        {
-            return this.pixelsBase + (((y * this.Width) + x) * Unsafe.SizeOf<TColor>());
-        }
-
         private void SetPixelBufferUnsafe(int width, int height, TColor[] pixels)
         {
             this.SetPixelBufferUnsafe(width, height, new PinnedBuffer<TColor>(width * height, pixels));

src/ImageSharp/Image/PixelArea{TColor}.cs

@@ -203,6 +203,16 @@ namespace ImageSharp
             Unsafe.InitBlock(this.PixelBase, 0, (uint)(this.RowStride * this.Height));
         }
 
+        /// <summary>
+        /// Gets a <see cref="BufferPointer{Byte}"/> to the row y.
+        /// </summary>
+        /// <param name="y">The y coordinate</param>
+        /// <returns>The <see cref="BufferPointer{Byte}"/></returns>
+        internal BufferPointer<byte> GetRowPointer(int y)
+        {
+            return this.byteBuffer.Slice(y * this.RowStride);
+        }
+
         /// <summary>
         /// Gets component count for the given order.
         /// </summary>

src/ImageSharp/ImageFrame.cs

@@ -1,52 +0,0 @@
-// <copyright file="ImageFrame.cs" company="James Jackson-South">
-// Copyright (c) James Jackson-South and contributors.
-// Licensed under the Apache License, Version 2.0.
-// </copyright>
-
-namespace ImageSharp
-{
-    using System.Diagnostics;
-
-    /// <summary>
-    /// An optimized frame for the <see cref="Image"/> class.
-    /// </summary>
-    [DebuggerDisplay("ImageFrame: {Width}x{Height}")]
-    public sealed class ImageFrame : ImageFrame<Color>
-    {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="ImageFrame"/> class.
-        /// </summary>
-        /// <param name="width">The width of the image in pixels.</param>
-        /// <param name="height">The height of the image in pixels.</param>
-        /// <param name="configuration">
-        /// The configuration providing initialization code which allows extending the library.
-        /// </param>
-        public ImageFrame(int width, int height, Configuration configuration = null)
-            : base(width, height, configuration)
-        {
-        }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="ImageFrame"/> class.
-        /// </summary>
-        /// <param name="image">
-        /// The image to create the frame from.
-        /// </param>
-        public ImageFrame(ImageBase<Color> image)
-            : base(image)
-        {
-        }
-
-        /// <inheritdoc />
-        public override PixelAccessor<Color> Lock()
-        {
-            return new PixelAccessor(this);
-        }
-
-        /// <inheritdoc />
-        internal override ImageFrame<Color> Clone()
-        {
-            return new ImageFrame(this);
-        }
-    }
-}

src/ImageSharp/PixelAccessor.cs

@@ -1,153 +0,0 @@
-// <copyright file="PixelAccessor.cs" company="James Jackson-South">
-// Copyright (c) James Jackson-South and contributors.
-// Licensed under the Apache License, Version 2.0.
-// </copyright>
-
-namespace ImageSharp
-{
-    using System.Runtime.CompilerServices;
-
-    /// <summary>
-    /// An optimized pixel accessor for the <see cref="Image"/> class.
-    /// </summary>
-    public sealed unsafe class PixelAccessor : PixelAccessor<Color>
-    {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="PixelAccessor"/> class.
-        /// </summary>
-        /// <param name="image">The image to provide pixel access for.</param>
-        public PixelAccessor(ImageBase<Color> image)
-          : base(image)
-        {
-        }
-
-        /// <inheritdoc />
-        protected override void CopyFromXyzw(PixelArea<Color> area, int targetX, int targetY, int width, int height)
-        {
-            uint byteCount = (uint)width * 4;
-
-            for (int y = 0; y < height; y++)
-            {
-                byte* source = area.PixelBase + (y * area.RowStride);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
-
-                Unsafe.CopyBlock(destination, source, byteCount);
-            }
-        }
-
-        /// <inheritdoc />
-        protected override void CopyFromXyz(PixelArea<Color> area, int targetX, int targetY, int width, int height)
-        {
-            for (int y = 0; y < height; y++)
-            {
-                byte* source = area.PixelBase + (y * area.RowStride);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
-
-                for (int x = 0; x < width; x++)
-                {
-                    Unsafe.Write(destination, (uint)(*source << 0 | *(source + 1) << 8 | *(source + 2) << 16 | 255 << 24));
-
-                    source += 3;
-                    destination += 4;
-                }
-            }
-        }
-
-        /// <inheritdoc />
-        protected override void CopyFromZyx(PixelArea<Color> area, int targetX, int targetY, int width, int height)
-        {
-            for (int y = 0; y < height; y++)
-            {
-                byte* source = area.PixelBase + (y * area.RowStride);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
-
-                for (int x = 0; x < width; x++)
-                {
-                    Unsafe.Write(destination, (uint)(*(source + 2) << 0 | *(source + 1) << 8 | *source << 16 | 255 << 24));
-
-                    source += 3;
-                    destination += 4;
-                }
-            }
-        }
-
-        /// <inheritdoc />
-        protected override void CopyFromZyxw(PixelArea<Color> area, int targetX, int targetY, int width, int height)
-        {
-            for (int y = 0; y < height; y++)
-            {
-                byte* source = area.PixelBase + (y * area.RowStride);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
-
-                for (int x = 0; x < width; x++)
-                {
-                    Unsafe.Write(destination, (uint)(*(source + 2) << 0 | *(source + 1) << 8 | *source << 16 | *(source + 3) << 24));
-
-                    source += 4;
-                    destination += 4;
-                }
-            }
-        }
-
-        /// <inheritdoc />
-        protected override void CopyToZyx(PixelArea<Color> area, int sourceX, int sourceY, int width, int height)
-        {
-            for (int y = 0; y < height; y++)
-            {
-                byte* source = this.GetRowPointer(sourceX, sourceY + y);
-                byte* destination = area.PixelBase + (y * area.RowStride);
-
-                for (int x = 0; x < width; x++)
-                {
-                    *destination = *(source + 2);
-                    *(destination + 1) = *(source + 1);
-                    *(destination + 2) = *(source + 0);
-
-                    source += 4;
-                    destination += 3;
-                }
-            }
-        }
-
-        /// <inheritdoc />
-        protected override void CopyToXyz(PixelArea<Color> area, int sourceX, int sourceY, int width, int height)
-        {
-            for (int y = 0; y < height; y++)
-            {
-                byte* source = this.GetRowPointer(sourceX, sourceY + y);
-                byte* destination = area.PixelBase + (y * area.RowStride);
-
-                for (int x = 0; x < width; x++)
-                {
-                    *destination = *(source + 0);
-                    *(destination + 1) = *(source + 1);
-                    *(destination + 2) = *(source + 2);
-
-                    source += 4;
-                    destination += 3;
-                }
-            }
-        }
-
-        /// <inheritdoc />
-        protected override void CopyToZyxw(PixelArea<Color> area, int sourceX, int sourceY, int width, int height)
-        {
-            for (int y = 0; y < height; y++)
-            {
-                byte* source = this.GetRowPointer(sourceX, sourceY + y);
-                byte* destination = area.PixelBase + (y * area.RowStride);
-
-                for (int x = 0; x < width; x++)
-                {
-                    *destination = *(source + 2);
-                    *(destination + 1) = *(source + 1);
-                    *(destination + 2) = *(source + 0);
-                    *(destination + 3) = *(source + 3);
-
-                    source += 4;
-                    destination += 4;
-                }
-            }
-        }
-    }
-}

tests/ImageSharp.Benchmarks/Color/Bulk/PackFromXyzw.cs

@@ -0,0 +1,63 @@
+// ReSharper disable InconsistentNaming
+namespace ImageSharp.Benchmarks.Color.Bulk
+{
+    using BenchmarkDotNet.Attributes;
+
+    using Color = ImageSharp.Color;
+
+    public abstract class PackFromXyzw<TColor>
+        where TColor : struct, IPixel<TColor>
+    {
+        private PinnedBuffer<TColor> destination;
+
+        private PinnedBuffer<byte> source;
+
+        [Params(16, 128, 1024)]
+        public int Count { get; set; }
+
+        [Setup]
+        public void Setup()
+        {
+            this.destination = new PinnedBuffer<TColor>(this.Count);
+            this.source = new PinnedBuffer<byte>(this.Count * 4);
+        }
+
+        [Cleanup]
+        public void Cleanup()
+        {
+            this.destination.Dispose();
+            this.source.Dispose();
+        }
+
+        [Benchmark(Baseline = true)]
+        public void PerElement()
+        {
+            byte[] s = this.source.Array;
+            TColor[] d = this.destination.Array;
+            
+            for (int i = 0; i < this.Count; i++)
+            {
+                int i4 = i * 4;
+                TColor c = default(TColor);
+                c.PackFromBytes(s[i4], s[i4 + 1], s[i4 + 2], s[i4 + 3]);
+                d[i] = c;
+            }
+        }
+
+        [Benchmark]
+        public void CommonBulk()
+        {
+            new BulkPixelOperations<TColor>().PackFromXyzwBytes(this.source, this.destination, this.Count);
+        }
+
+        [Benchmark]
+        public void OptimizedBulk()
+        {
+            BulkPixelOperations<TColor>.Instance.PackFromXyzwBytes(this.source, this.destination, this.Count);
+        }
+    }
+
+    public class PackFromXyzw_Color : PackFromXyzw<Color>
+    {
+    }
+}

tests/ImageSharp.Benchmarks/Color/Bulk/PixelAccessorVirtualCopy.cs

@@ -1,129 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-
-namespace ImageSharp.Benchmarks.Color.Bulk
-{
-    using System.Runtime.CompilerServices;
-    using System.Runtime.InteropServices;
-
-    using BenchmarkDotNet.Attributes;
-
-    using Color = ImageSharp.Color;
-
-    /// <summary>
-    /// Benchmark to measure the effect of using virtual bulk-copy calls inside PixelAccessor methods
-    /// </summary>
-    public unsafe class PixelAccessorVirtualCopy
-    {
-        abstract class CopyExecutor
-        {
-            internal abstract void VirtualCopy(BufferPointer<Color> destination, BufferPointer<byte> source, int count);
-        }
-
-        class UnsafeCopyExecutor : CopyExecutor
-        {
-            [MethodImpl(MethodImplOptions.NoInlining)]
-            internal override unsafe void VirtualCopy(BufferPointer<Color> destination, BufferPointer<byte> source, int count)
-            {
-                Unsafe.CopyBlock((void*)destination.PointerAtOffset, (void*)source.PointerAtOffset, (uint)count*4);
-            }
-        }
-        
-        private PixelAccessor<Color> pixelAccessor;
-
-        private PixelArea<Color> area;
-
-        private CopyExecutor executor;
-        
-        [Params(64, 256, 512)]
-        public int Width { get; set; }
-
-        public int Height { get; set; } = 256;
-        
-
-        [Setup]
-        public void Setup()
-        {
-            this.pixelAccessor = new PixelAccessor<ImageSharp.Color>(this.Width, this.Height);
-            this.area = new PixelArea<Color>(this.Width / 2, this.Height, ComponentOrder.Xyzw);
-            this.executor = new UnsafeCopyExecutor();
-        }
-
-        [Cleanup]
-        public void Cleanup()
-        {
-            this.pixelAccessor.Dispose();
-            this.area.Dispose();
-        }
-
-        [Benchmark(Baseline = true)]
-        public void CopyRawUnsafeInlined()
-        {
-            uint byteCount = (uint)this.area.Width * 4;
-
-            int targetX = this.Width / 4;
-            int targetY = 0;
-
-            for (int y = 0; y < this.Height; y++)
-            {
-                byte* source = this.area.PixelBase + (y * this.area.RowStride);
-                byte* destination = this.GetRowPointer(targetX, targetY + y);
-
-                Unsafe.CopyBlock(destination, source, byteCount);
-            }
-        }
-        
-        [Benchmark]
-        public void CopyBufferPointerUnsafeInlined()
-        {
-            uint byteCount = (uint)this.area.Width * 4;
-
-            int targetX = this.Width / 4;
-            int targetY = 0;
-
-            for (int y = 0; y < this.Height; y++)
-            {
-                BufferPointer<byte> source = this.GetAreaRow(y);
-                BufferPointer<Color> destination = this.GetPixelAccessorRow(targetX, targetY + y);
-                Unsafe.CopyBlock((void*)destination.PointerAtOffset, (void*)source.PointerAtOffset, byteCount);
-            }
-        }
-        
-        [Benchmark]
-        public void CopyBufferPointerUnsafeVirtual()
-        {
-            int targetX = this.Width / 4;
-            int targetY = 0;
-
-            for (int y = 0; y < this.Height; y++)
-            {
-                BufferPointer<byte> source = this.GetAreaRow(y);
-                BufferPointer<Color> destination = this.GetPixelAccessorRow(targetX, targetY + y);
-                this.executor.VirtualCopy(destination, source, this.area.Width);
-            }
-        }
-        
-        private byte* GetRowPointer(int x, int y)
-        {
-            return (byte*)this.pixelAccessor.DataPointer + (((y * this.pixelAccessor.Width) + x) * Unsafe.SizeOf<Color>());
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private BufferPointer<Color> GetPixelAccessorRow(int x, int y)
-        {
-            return new BufferPointer<ImageSharp.Color>(
-                this.pixelAccessor.PixelBuffer,
-                (void*)this.pixelAccessor.DataPointer,
-                (y * this.pixelAccessor.Width) + x
-                );
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private BufferPointer<byte> GetAreaRow(int y)
-        {
-            return new BufferPointer<byte>(this.area.Bytes, this.area.PixelBase, y * this.area.RowStride);
-        }
-    }
-}

tests/ImageSharp.Benchmarks/Color/Bulk/ToVector4.cs

@@ -0,0 +1,61 @@
+// ReSharper disable InconsistentNaming
+namespace ImageSharp.Benchmarks.Color.Bulk
+{
+    using System.Numerics;
+
+    using BenchmarkDotNet.Attributes;
+
+    public abstract class ToVector4<TColor>
+        where TColor : struct, IPixel<TColor>
+    {
+        private PinnedBuffer<TColor> source;
+
+        private PinnedBuffer<Vector4> destination;
+
+        [Params(64, 300, 1024)]
+        public int Count { get; set; }
+
+        [Setup]
+        public void Setup()
+        {
+            this.source = new PinnedBuffer<TColor>(this.Count);
+            this.destination = new PinnedBuffer<Vector4>(this.Count);
+        }
+
+        [Cleanup]
+        public void Cleanup()
+        {
+            this.source.Dispose();
+            this.destination.Dispose();
+        }
+
+        [Benchmark(Baseline = true)]
+        public void PerElement()
+        {
+            TColor[] s = this.source.Array;
+            Vector4[] d = this.destination.Array;
+
+            for (int i = 0; i < this.Count; i++)
+            {
+                TColor c = s[i];
+                d[i] = c.ToVector4();
+            }
+        }
+
+        [Benchmark]
+        public void CommonBulk()
+        {
+            new BulkPixelOperations<TColor>().ToVector4(this.source, this.destination, this.Count);
+        }
+
+        [Benchmark]
+        public void OptimizedBulk()
+        {
+            BulkPixelOperations<TColor>.Instance.ToVector4(this.source, this.destination, this.Count);
+        }
+    }
+
+    public class ToVector4_Color : ToVector4<ImageSharp.Color>
+    {
+    }
+}

tests/ImageSharp.Benchmarks/Color/Bulk/ToXyz.cs

@@ -0,0 +1,61 @@
+// ReSharper disable InconsistentNaming
+namespace ImageSharp.Benchmarks.Color.Bulk
+{
+    using BenchmarkDotNet.Attributes;
+
+    using Color = ImageSharp.Color;
+
+    public abstract class ToXyz<TColor>
+        where TColor : struct, IPixel<TColor>
+    {
+        private PinnedBuffer<TColor> source;
+
+        private PinnedBuffer<byte> destination;
+
+        [Params(16, 128, 1024)]
+        public int Count { get; set; }
+
+        [Setup]
+        public void Setup()
+        {
+            this.source = new PinnedBuffer<TColor>(this.Count);
+            this.destination = new PinnedBuffer<byte>(this.Count * 3);
+        }
+
+        [Cleanup]
+        public void Cleanup()
+        {
+            this.source.Dispose();
+            this.destination.Dispose();
+        }
+
+        [Benchmark(Baseline = true)]
+        public void PerElement()
+        {
+            TColor[] s = this.source.Array;
+            byte[] d = this.destination.Array;
+
+            for (int i = 0; i < this.Count; i++)
+            {
+                TColor c = s[i];
+                c.ToXyzBytes(d, i * 4);
+            }
+        }
+
+        [Benchmark]
+        public void CommonBulk()
+        {
+            new BulkPixelOperations<TColor>().ToXyzBytes(this.source, this.destination, this.Count);
+        }
+
+        [Benchmark]
+        public void OptimizedBulk()
+        {
+            BulkPixelOperations<TColor>.Instance.ToXyzBytes(this.source, this.destination, this.Count);
+        }
+    }
+
+    public class ToXyz_Color : ToXyz<Color>
+    {
+    }
+}

tests/ImageSharp.Benchmarks/Color/Bulk/ToXyzw.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+// ReSharper disable InconsistentNaming
+
+namespace ImageSharp.Benchmarks.Color.Bulk
+{
+    using BenchmarkDotNet.Attributes;
+
+    using Color = ImageSharp.Color;
+
+    public abstract class ToXyzw<TColor>
+        where TColor : struct, IPixel<TColor>
+    {
+        private PinnedBuffer<TColor> source;
+
+        private PinnedBuffer<byte> destination;
+
+        [Params(16, 128, 1024)]
+        public int Count { get; set; }
+
+        [Setup]
+        public void Setup()
+        {
+            this.source = new PinnedBuffer<TColor>(this.Count);
+            this.destination = new PinnedBuffer<byte>(this.Count * 4);
+        }
+
+        [Cleanup]
+        public void Cleanup()
+        {
+            this.source.Dispose();
+            this.destination.Dispose();
+        }
+
+        [Benchmark(Baseline = true)]
+        public void PerElement()
+        {
+            TColor[] s = this.source.Array;
+            byte[] d = this.destination.Array;
+
+            for (int i = 0; i < this.Count; i++)
+            {
+                TColor c = s[i];
+                c.ToXyzwBytes(d, i * 4);
+            }
+        }
+
+        [Benchmark]
+        public void CommonBulk()
+        {
+            new BulkPixelOperations<TColor>().ToXyzwBytes(this.source, this.destination, this.Count);
+        }
+
+        [Benchmark]
+        public void OptimizedBulk()
+        {
+            BulkPixelOperations<TColor>.Instance.ToXyzwBytes(this.source, this.destination, this.Count);
+        }
+    }
+    
+    public class ToXyzw_Color : ToXyzw<Color>
+    {
+    }
+
+    public class ToXyzw_Argb : ToXyzw<Argb>
+    {
+    }
+}

tests/ImageSharp.Benchmarks/General/ClearBuffer.cs

@@ -0,0 +1,43 @@
+// ReSharper disable InconsistentNaming
+namespace ImageSharp.Benchmarks.General
+{
+    using System;
+    using System.Runtime.CompilerServices;
+    using System.Runtime.InteropServices;
+
+    using BenchmarkDotNet.Attributes;
+
+    using Color = ImageSharp.Color;
+
+    public unsafe class ClearBuffer
+    {
+        private PinnedBuffer<Color> buffer;
+        
+        [Params(32, 128, 512)]
+        public int Count { get; set; }
+
+        [Setup]
+        public void Setup()
+        {
+            this.buffer = new PinnedBuffer<ImageSharp.Color>(this.Count);
+        }
+
+        [Cleanup]
+        public void Cleanup()
+        {
+            this.buffer.Dispose();
+        }
+
+        [Benchmark(Baseline = true)]
+        public void Array_Clear()
+        {
+            Array.Clear(this.buffer.Array, 0, this.Count);
+        }
+
+        [Benchmark]
+        public void Unsafe_InitBlock()
+        {
+            Unsafe.InitBlock((void*)this.buffer.Pointer, default(byte), (uint)this.Count*sizeof(uint));
+        }
+    }
+}

tests/ImageSharp.Benchmarks/Image/EncodePng.cs

@@ -10,6 +10,10 @@ namespace ImageSharp.Benchmarks.Image
     using System.IO;
 
     using BenchmarkDotNet.Attributes;
+
+    using ImageSharp.Formats;
+    using ImageSharp.Quantizers;
+
     using CoreImage = ImageSharp.Image;
 
     public class EncodePng : BenchmarkBase
@@ -19,12 +23,21 @@ namespace ImageSharp.Benchmarks.Image
         private Image bmpDrawing;
         private CoreImage bmpCore;
 
+        [Params(false)]
+        public bool LargeImage { get; set; }
+
+        [Params(false)]
+        public bool UseOctreeQuantizer { get; set; }
+
         [Setup]
         public void ReadImages()
         {
             if (this.bmpStream == null)
             {
-                this.bmpStream = File.OpenRead("../ImageSharp.Tests/TestImages/Formats/Bmp/Car.bmp");
+                string path = this.LargeImage
+                                  ? "../ImageSharp.Tests/TestImages/Formats/Jpg/baseline/jpeg420exif.jpg"
+                                  : "../ImageSharp.Tests/TestImages/Formats/Bmp/Car.bmp";
+                this.bmpStream = File.OpenRead(path);
                 this.bmpCore = new CoreImage(this.bmpStream);
                 this.bmpStream.Position = 0;
                 this.bmpDrawing = Image.FromStream(this.bmpStream);
@@ -53,7 +66,13 @@ namespace ImageSharp.Benchmarks.Image
         {
             using (MemoryStream memoryStream = new MemoryStream())
             {
-                this.bmpCore.SaveAsPng(memoryStream);
+                Quantizer<ImageSharp.Color> quantizer = this.UseOctreeQuantizer
+                                                            ? (Quantizer<ImageSharp.Color>)
+                                                            new OctreeQuantizer<ImageSharp.Color>()
+                                                            : new PaletteQuantizer<ImageSharp.Color>();
+
+                PngEncoderOptions options = new PngEncoderOptions() { Quantizer = quantizer };
+                this.bmpCore.SaveAsPng(memoryStream, options);
             }
         }
     }

tests/ImageSharp.Sandbox46/ImageSharp.Sandbox46.csproj

@@ -206,12 +206,12 @@
     </Reference>
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="..\ImageSharp.Benchmarks\Color\Bulk\PixelAccessorVirtualCopy.cs">
-      <Link>Benchmarks\PixelAccessorVirtualCopy.cs</Link>
-    </Compile>
     <Compile Include="..\ImageSharp.Tests\Colors\BulkPixelOperationsTests.cs">
       <Link>Tests\Colors\BulkPixelOperationsTests.cs</Link>
     </Compile>
+    <Compile Include="..\ImageSharp.Tests\Common\BufferPointerTests.cs">
+      <Link>Tests\Common\BufferPointerTests.cs</Link>
+    </Compile>
     <Compile Include="..\ImageSharp.Tests\Common\PinnedBufferTests.cs">
       <Link>Tests\Common\PinnedBufferTests.cs</Link>
     </Compile>
@@ -272,6 +272,9 @@
     <Compile Include="..\ImageSharp.Tests\TestImages.cs">
       <Link>Tests\TestImages.cs</Link>
     </Compile>
+    <Compile Include="..\ImageSharp.Tests\TestUtilities\ApproximateFloatComparer.cs">
+      <Link>Tests\TestUtilities\ApproximateFloatComparer.cs</Link>
+    </Compile>
     <Compile Include="..\ImageSharp.Tests\TestUtilities\Attributes\ImageDataAttributeBase.cs">
       <Link>Tests\TestUtilities\Attributes\ImageDataAttributeBase.cs</Link>
     </Compile>
@@ -340,7 +343,9 @@
   <ItemGroup>
     <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
   </ItemGroup>
-  <ItemGroup />
+  <ItemGroup>
+    <Folder Include="Benchmarks\" />
+  </ItemGroup>
   <ItemGroup>
     <Analyzer Include="..\..\packages\Microsoft.CodeAnalysis.Analyzers.1.1.0\analyzers\dotnet\cs\Microsoft.CodeAnalysis.Analyzers.dll" />
     <Analyzer Include="..\..\packages\Microsoft.CodeAnalysis.Analyzers.1.1.0\analyzers\dotnet\cs\Microsoft.CodeAnalysis.CSharp.Analyzers.dll" />

tests/ImageSharp.Sandbox46/Program.cs

@@ -7,9 +7,9 @@ namespace ImageSharp.Sandbox46
 {
     using System;
     using System.Runtime.DesignerServices;
-
+    
-    using ImageSharp.Benchmarks.Color.Bulk;
     using ImageSharp.Tests;
+    using ImageSharp.Tests.Colors;
 
     using Xunit.Abstractions;
 
@@ -38,21 +38,18 @@ namespace ImageSharp.Sandbox46
         public static void Main(string[] args)
         {
             // RunDecodeJpegProfilingTests();
-            TestPixelAccessorCopyFromXyzw();
+
+            RunToVector4ProfilingTest();
+
             Console.ReadLine();
         }
 
-        private static void TestPixelAccessorCopyFromXyzw()
+        private static void RunToVector4ProfilingTest()
         {
-            PixelAccessorVirtualCopy benchmark = new PixelAccessorVirtualCopy();
+            BulkPixelOperationsTests.Color tests = new BulkPixelOperationsTests.Color(new ConsoleOutput());
-            benchmark.Width = 64;
+            tests.Benchmark_ToVector4();
-            benchmark.Setup();
-
-            benchmark.CopyRawUnsafeInlined();
-            
-            benchmark.Cleanup();
         }
-
+        
         private static void RunDecodeJpegProfilingTests()
         {
             Console.WriteLine("RunDecodeJpegProfilingTests...");

tests/ImageSharp.Tests/Colors/BulkPixelOperationsTests.cs

@@ -1,21 +1,71 @@
-namespace ImageSharp.Tests.Colors
+// ReSharper disable InconsistentNaming
+// ReSharper disable AccessToDisposedClosure
+namespace ImageSharp.Tests.Colors
 {
     using System;
     using System.Numerics;
 
     using Xunit;
+    using Xunit.Abstractions;
 
     public class BulkPixelOperationsTests
     {
         public class Color : BulkPixelOperationsTests<ImageSharp.Color>
         {
+            public Color(ITestOutputHelper output)
+                : base(output)
+            {
+            }
+
             // For 4.6 test runner MemberData does not work without redeclaring the public field in the derived test class:
             public static new TheoryData<int> ArraySizesData => new TheoryData<int> { 7, 16, 1111 };
+
+            [Fact]
+            public void IsSpecialImplementation()
+            {
+                Assert.IsType<ImageSharp.Color.BulkOperations>(BulkPixelOperations<ImageSharp.Color>.Instance);
+            }
+            
+            [Fact]
+            public void ToVector4SimdAligned()
+            {
+                ImageSharp.Color[] source = CreatePixelTestData(64);
+                Vector4[] expected = CreateExpectedVector4Data(source);
+
+                TestOperation(
+                    source,
+                    expected,
+                    (s, d) => ImageSharp.Color.BulkOperations.ToVector4SimdAligned(s, d, 64)
+                    );
+            }
+
+            // [Fact] // Profiling benchmark - enable manually!
+            public void Benchmark_ToVector4()
+            {
+                int times = 200000;
+                int count = 1024;
+
+                using (PinnedBuffer<ImageSharp.Color> source = new PinnedBuffer<ImageSharp.Color>(count))
+                using (PinnedBuffer<Vector4> dest = new PinnedBuffer<Vector4>(count))
+                {
+                    this.Measure(
+                        times,
+                        () =>
+                            {
+                                BulkPixelOperations<ImageSharp.Color>.Instance.ToVector4(source, dest, count);
+                            });
+                }
+            }
         }
 
         public class Argb : BulkPixelOperationsTests<ImageSharp.Argb>
         {
             // For 4.6 test runner MemberData does not work without redeclaring the public field in the derived test class:
+            public Argb(ITestOutputHelper output)
+                : base(output)
+            {
+            }
+
             public static new TheoryData<int> ArraySizesData => new TheoryData<int> { 7, 16, 1111 };
         }
 
@@ -28,46 +78,65 @@
         }
     }
 
-    public abstract class BulkPixelOperationsTests<TColor>
+    public abstract class BulkPixelOperationsTests<TColor> : MeasureFixture
         where TColor : struct, IPixel<TColor>
     {
+        protected BulkPixelOperationsTests(ITestOutputHelper output)
+            : base(output)
+        {
+        }
+
         public static TheoryData<int> ArraySizesData => new TheoryData<int> { 7, 16, 1111 };
-        
+
-        [Theory]
+        private static BulkPixelOperations<TColor> Operations => BulkPixelOperations<TColor>.Instance;
-        [MemberData(nameof(ArraySizesData))]
+
-        public void PackFromVector4(int count)
+        internal static TColor[] CreateExpectedPixelData(Vector4[] source)
         {
-            Vector4[] source = CreateVector4TestData(count);
+            TColor[] expected = new TColor[source.Length];
-            TColor[] expected = new TColor[count];
 
-            for (int i = 0; i < count; i++)
+            for (int i = 0; i < expected.Length; i++)
             {
                 expected[i].PackFromVector4(source[i]);
             }
+            return expected;
+        }
+
+        [Theory]
+        [MemberData(nameof(ArraySizesData))]
+        public void PackFromVector4(int count)
+        {
+            Vector4[] source = CreateVector4TestData(count);
+            TColor[] expected = CreateExpectedPixelData(source);
 
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.PackFromVector4(s, d, count)
+                (s, d) => Operations.PackFromVector4(s, d, count)
                 );
         }
 
-        [Theory]
+        internal static Vector4[] CreateExpectedVector4Data(TColor[] source)
-        [MemberData(nameof(ArraySizesData))]
-        public void PackToVector4(int count)
         {
-            TColor[] source = CreatePixelTestData(count);
+            Vector4[] expected = new Vector4[source.Length];
-            Vector4[] expected = new Vector4[count];
 
-            for (int i = 0; i < count; i++)
+            for (int i = 0; i < expected.Length; i++)
             {
                 expected[i] = source[i].ToVector4();
             }
+            return expected;
+        }
+
+        [Theory]
+        [MemberData(nameof(ArraySizesData))]
+        public void ToVector4(int count)
+        {
+            TColor[] source = CreatePixelTestData(count);
+            Vector4[] expected = CreateExpectedVector4Data(source);
 
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.ToVector4(s, d, count)
+                (s, d) => Operations.ToVector4(s, d, count)
                 );
         }
 
@@ -89,13 +158,13 @@
             TestOperation(
                 source, 
                 expected, 
-                (ops, s, d) => ops.PackFromXyzBytes(s, d, count)
+                (s, d) => Operations.PackFromXyzBytes(s, d, count)
                 );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackToXyzBytes(int count)
+        public void ToXyzBytes(int count)
         {
             TColor[] source = CreatePixelTestData(count);
             byte[] expected = new byte[count * 3];
@@ -109,7 +178,7 @@
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.ToXyzBytes(s, d, count)
+                (s, d) => Operations.ToXyzBytes(s, d, count)
                 );
         }
 
@@ -130,13 +199,13 @@
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.PackFromXyzwBytes(s, d, count)
+                (s, d) => Operations.PackFromXyzwBytes(s, d, count)
                 );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackToXyzwBytes(int count)
+        public void ToXyzwBytes(int count)
         {
             TColor[] source = CreatePixelTestData(count);
             byte[] expected = new byte[count * 4];
@@ -150,7 +219,7 @@
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.ToXyzwBytes(s, d, count)
+                (s, d) => Operations.ToXyzwBytes(s, d, count)
                 );
         }
 
@@ -171,13 +240,13 @@
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.PackFromZyxBytes(s, d, count)
+                (s, d) => Operations.PackFromZyxBytes(s, d, count)
                 );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackToZyxBytes(int count)
+        public void ToZyxBytes(int count)
         {
             TColor[] source = CreatePixelTestData(count);
             byte[] expected = new byte[count * 3];
@@ -191,7 +260,7 @@
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.ToZyxBytes(s, d, count)
+                (s, d) => Operations.ToZyxBytes(s, d, count)
                 );
         }
 
@@ -212,13 +281,13 @@
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.PackFromZyxwBytes(s, d, count)
+                (s, d) => Operations.PackFromZyxwBytes(s, d, count)
                 );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackToZyxwBytes(int count)
+        public void ToZyxwBytes(int count)
         {
             TColor[] source = CreatePixelTestData(count);
             byte[] expected = new byte[count * 4];
@@ -232,7 +301,7 @@
             TestOperation(
                 source,
                 expected,
-                (ops, s, d) => ops.ToZyxwBytes(s, d, count)
+                (s, d) => Operations.ToZyxwBytes(s, d, count)
                 );
         }
 
@@ -262,33 +331,51 @@
                 this.ExpectedDestBuffer.Dispose();
             }
 
+            private const float Tolerance = 0.0001f;
+
             public void Verify()
             {
                 int count = this.ExpectedDestBuffer.Count;
-                TDest[] expected = this.ExpectedDestBuffer.Array;
+
-                TDest[] actual = this.ActualDestBuffer.Array;
+                if (typeof(TDest) == typeof(Vector4))
-                for (int i = 0; i < count; i++)
+                {
+                    Vector4[] expected = this.ExpectedDestBuffer.Array as Vector4[];
+                    Vector4[] actual = this.ActualDestBuffer.Array as Vector4[];
+
+                    for (int i = 0; i < count; i++)
+                    {
+                        // ReSharper disable PossibleNullReferenceException
+                        Assert.Equal(expected[i], actual[i], new ApproximateFloatComparer(0.001f));
+                        // ReSharper restore PossibleNullReferenceException
+                    }
+                }
+                else
                 {
-                    Assert.Equal(expected[i], actual[i]);
+                    TDest[] expected = this.ExpectedDestBuffer.Array;
+                    TDest[] actual = this.ActualDestBuffer.Array;
+                    for (int i = 0; i < count; i++)
+                    {
+                        Assert.Equal(expected[i], actual[i]);
+                    }
                 }
             }
         }
 
-        private static void TestOperation<TSource, TDest>(
+        internal static void TestOperation<TSource, TDest>(
             TSource[] source,
             TDest[] expected,
-            Action<BulkPixelOperations<TColor>, BufferPointer<TSource>, BufferPointer<TDest>> action)
+            Action<BufferPointer<TSource>, BufferPointer<TDest>> action)
             where TSource : struct
             where TDest : struct
         {
             using (var buffers = new TestBuffers<TSource, TDest>(source, expected))
             {
-                action(BulkPixelOperations<TColor>.Instance, buffers.Source, buffers.ActualDest);
+                action(buffers.Source, buffers.ActualDest);
                 buffers.Verify();
             }
         }
 
-        private static Vector4[] CreateVector4TestData(int length)
+        internal static Vector4[] CreateVector4TestData(int length)
         {
             Vector4[] result = new Vector4[length];
             Random rnd = new Random(42); // Deterministic random values
@@ -300,7 +387,7 @@
             return result;
         }
 
-        private static TColor[] CreatePixelTestData(int length)
+        internal static TColor[] CreatePixelTestData(int length)
         {
             TColor[] result = new TColor[length];
 
@@ -315,7 +402,7 @@
             return result;
         }
 
-        private static byte[] CreateByteTestData(int length)
+        internal static byte[] CreateByteTestData(int length)
         {
             byte[] result = new byte[length];
             Random rnd = new Random(42); // Deterministic random values
@@ -326,8 +413,8 @@
             }
             return result;
         }
-        
+
-        private static Vector4 GetVector(Random rnd)
+        internal static Vector4 GetVector(Random rnd)
         {
             return new Vector4(
                 (float)rnd.NextDouble(),

tests/ImageSharp.Tests/Common/BufferPointerTests.cs

@@ -15,16 +15,68 @@ namespace ImageSharp.Tests.Common
 
             public double B;
 
+            public Foo(int a, double b)
+            {
+                this.A = a;
+                this.B = b;
+            }
+
             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(i+1, i+1);
+                }
+                return result;
+            }
+        }
+
+        /// <summary>
+        /// sizeof(AlignedFoo) == sizeof(long)
+        /// </summary>
+        public struct AlignedFoo
+        {
+            public int A;
+
+            public int B;
+
+            static AlignedFoo()
+            {
+                Assert.Equal(sizeof(AlignedFoo), sizeof(long));
+            }
+
+            public AlignedFoo(int a, int b)
+            {
+                this.A = a;
+                this.B = b;
+            }
+
+            internal static AlignedFoo[] CreateArray(int size)
+            {
+                AlignedFoo[] result = new AlignedFoo[size];
+                for (int i = 0; i < size; i++)
+                {
+                    result[i] = new AlignedFoo(i + 1, i + 1);
                 }
                 return result;
             }
         }
+
+        [Fact]
+        public void AsBytes()
+        {
+            Foo[] fooz = { new Foo(1, 2), new Foo(3, 4), new Foo(5, 6) };
+
+            using (PinnedBuffer<Foo> colorBuf = new PinnedBuffer<Foo>(fooz))
+            {
+                BufferPointer<Foo> orig = colorBuf.Slice(1);
+                BufferPointer<byte> asBytes = (BufferPointer < byte > )orig;
+
+                Assert.Equal(asBytes.Offset, sizeof(Foo));
+                Assert.Equal(orig.PointerAtOffset, asBytes.PointerAtOffset);
+            }
+        }
         
         [Fact]
         public void ConstructWithoutOffset()
@@ -79,8 +131,58 @@ namespace ImageSharp.Tests.Common
             }
         }
 
+
+        [Theory]
+        [InlineData(4)]
+        [InlineData(1500)]
+        public void Clear(int count)
+        {
+            Foo[] array = Foo.CreateArray(count + 42);
+
+            int offset = 2;
+            fixed (Foo* p = array)
+            {
+                BufferPointer<Foo> ap = new BufferPointer<Foo>(array, p, offset);
+
+                // Act:
+                ap.Clear(count);
+
+                Assert.NotEqual(default(Foo), array[offset-1]);
+                Assert.Equal(default(Foo), array[offset]);
+                Assert.Equal(default(Foo), array[offset + count-1]);
+                Assert.NotEqual(default(Foo), array[offset + count]);
+            }
+        }
+
+
         public class Copy
         {
+            private static void AssertNotDefault<T>(T[] data, int idx)
+                where T : struct
+            {
+                Assert.NotEqual(default(T), data[idx]);
+            }
+
+            private static byte[] CreateTestBytes(int count)
+            {
+                byte[] result = new byte[count];
+                for (int i = 0; i < result.Length; i++)
+                {
+                    result[i] = (byte)((i % 200) + 1);
+                }
+                return result;
+            }
+
+            private static int[] CreateTestInts(int count)
+            {
+                int[] result = new int[count];
+                for (int i = 0; i < result.Length; i++)
+                {
+                    result[i] = i + 1;
+                }
+                return result;
+            }
+
             [Theory]
             [InlineData(4)]
             [InlineData(1500)]
@@ -92,35 +194,150 @@ namespace ImageSharp.Tests.Common
                 fixed (Foo* pSource = source)
                 fixed (Foo* pDest = dest)
                 {
-                    BufferPointer<Foo> apSource = new BufferPointer<Foo>(source, pSource);
+                    BufferPointer<Foo> apSource = new BufferPointer<Foo>(source, pSource, 1);
-                    BufferPointer<Foo> apDest = new BufferPointer<Foo>(dest, pDest);
+                    BufferPointer<Foo> apDest = new BufferPointer<Foo>(dest, pDest, 1);
 
-                    BufferPointer.Copy(apSource, apDest, count);
+                    BufferPointer.Copy(apSource, apDest, count-1);
                 }
 
-                Assert.Equal(source[0], dest[0]);
+                AssertNotDefault(source, 1);
+                AssertNotDefault(dest, 1);
+
+                Assert.NotEqual(source[0], dest[0]);
+                Assert.Equal(source[1], dest[1]);
+                Assert.Equal(source[2], dest[2]);
                 Assert.Equal(source[count-1], dest[count-1]);
                 Assert.NotEqual(source[count], dest[count]);
             }
-            
+
+            [Theory]
+            [InlineData(4)]
+            [InlineData(1500)]
+            public void GenericToOwnType_Aligned(int count)
+            {
+                AlignedFoo[] source = AlignedFoo.CreateArray(count + 2);
+                AlignedFoo[] dest = new AlignedFoo[count + 5];
+
+                fixed (AlignedFoo* pSource = source)
+                fixed (AlignedFoo* pDest = dest)
+                {
+                    BufferPointer<AlignedFoo> apSource = new BufferPointer<AlignedFoo>(source, pSource, 1);
+                    BufferPointer<AlignedFoo> apDest = new BufferPointer<AlignedFoo>(dest, pDest, 1);
+
+                    BufferPointer.Copy(apSource, apDest, count - 1);
+                }
+
+                AssertNotDefault(source, 1);
+                AssertNotDefault(dest, 1);
+
+                Assert.NotEqual(source[0], dest[0]);
+                Assert.Equal(source[1], dest[1]);
+                Assert.Equal(source[2], dest[2]);
+                Assert.Equal(source[count - 1], dest[count - 1]);
+                Assert.NotEqual(source[count], dest[count]);
+            }
+
+            [Theory]
+            [InlineData(4)]
+            [InlineData(1500)]
+            public void IntToInt(int count)
+            {
+                int[] source = CreateTestInts(count+2);
+                int[] dest = new int[count + 5];
+
+                fixed (int* pSource = source)
+                fixed (int* pDest = dest)
+                {
+                    BufferPointer<int> apSource = new BufferPointer<int>(source, pSource, 1);
+                    BufferPointer<int> apDest = new BufferPointer<int>(dest, pDest, 1);
+
+                    BufferPointer.Copy(apSource, apDest, count -1);
+                }
+
+                AssertNotDefault(source, 1);
+                AssertNotDefault(dest, 1);
+
+                Assert.NotEqual(source[0], dest[0]);
+                Assert.Equal(source[1], dest[1]);
+                Assert.Equal(source[2], dest[2]);
+                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);
+                Foo[] source = Foo.CreateArray(count+2);
-                byte[] dest = new byte[destCount + sizeof(Foo) + 1];
+                byte[] dest = new byte[destCount + sizeof(Foo)*2];
 
                 fixed (Foo* pSource = source)
                 fixed (byte* pDest = dest)
                 {
-                    BufferPointer<Foo> apSource = new BufferPointer<Foo>(source, pSource);
+                    BufferPointer<Foo> apSource = new BufferPointer<Foo>(source, pSource, 1);
+                    BufferPointer<byte> apDest = new BufferPointer<byte>(dest, pDest, sizeof(Foo));
+
+                    BufferPointer.Copy(apSource, apDest, count - 1);
+                }
+
+                AssertNotDefault(source, 1);
+
+                Assert.False(ElementsAreEqual(source, dest, 0));
+                Assert.True(ElementsAreEqual(source, dest, 1));
+                Assert.True(ElementsAreEqual(source, dest, 2));
+                Assert.True(ElementsAreEqual(source, dest, count - 1));
+                Assert.False(ElementsAreEqual(source, dest, count));
+            }
+
+            [Theory]
+            [InlineData(4)]
+            [InlineData(1500)]
+            public void GenericToBytes_Aligned(int count)
+            {
+                int destCount = count * sizeof(Foo);
+                AlignedFoo[] source = AlignedFoo.CreateArray(count + 2);
+                byte[] dest = new byte[destCount + sizeof(AlignedFoo) * 2];
+
+                fixed (AlignedFoo* pSource = source)
+                fixed (byte* pDest = dest)
+                {
+                    BufferPointer<AlignedFoo> apSource = new BufferPointer<AlignedFoo>(source, pSource, 1);
+                    BufferPointer<byte> apDest = new BufferPointer<byte>(dest, pDest, sizeof(AlignedFoo));
+
+                    BufferPointer.Copy(apSource, apDest, count - 1);
+                }
+
+                AssertNotDefault(source, 1);
+
+                Assert.False(ElementsAreEqual(source, dest, 0));
+                Assert.True(ElementsAreEqual(source, dest, 1));
+                Assert.True(ElementsAreEqual(source, dest, 2));
+                Assert.True(ElementsAreEqual(source, dest, count - 1));
+                Assert.False(ElementsAreEqual(source, dest, count));
+            }
+
+            [Theory]
+            [InlineData(4)]
+            [InlineData(1500)]
+            public void IntToBytes(int count)
+            {
+                int destCount = count * sizeof(int);
+                int[] source = CreateTestInts(count+2);
+                byte[] dest = new byte[destCount + sizeof(int) + 1];
+
+                fixed (int* pSource = source)
+                fixed (byte* pDest = dest)
+                {
+                    BufferPointer<int> apSource = new BufferPointer<int>(source, pSource);
                     BufferPointer<byte> apDest = new BufferPointer<byte>(dest, pDest);
 
                     BufferPointer.Copy(apSource, apDest, count);
                 }
 
+                AssertNotDefault(source, 1);
+
                 Assert.True(ElementsAreEqual(source, dest, 0));
                 Assert.True(ElementsAreEqual(source, dest, count - 1));
                 Assert.False(ElementsAreEqual(source, dest, count));
@@ -131,9 +348,9 @@ namespace ImageSharp.Tests.Common
             [InlineData(1500)]
             public void BytesToGeneric(int count)
             {
-                int destCount = count * sizeof(Foo);
+                int srcCount = count * sizeof(Foo);
-                byte[] source = new byte[destCount + sizeof(Foo) + 1];
+                byte[] source = CreateTestBytes(srcCount);
-                Foo[] dest = Foo.CreateArray(count + 2);
+                Foo[] dest = new Foo[count + 2];
                 
                 fixed(byte* pSource = source)
                 fixed (Foo* pDest = dest)
@@ -144,12 +361,35 @@ namespace ImageSharp.Tests.Common
                     BufferPointer.Copy(apSource, apDest, count);
                 }
 
+                AssertNotDefault(source, sizeof(Foo) + 1);
+                AssertNotDefault(dest, 1);
+
                 Assert.True(ElementsAreEqual(dest, source, 0));
+                Assert.True(ElementsAreEqual(dest, source, 1));
                 Assert.True(ElementsAreEqual(dest, source, count - 1));
                 Assert.False(ElementsAreEqual(dest, source, count));
             }
-            
+
-            private static bool ElementsAreEqual(Foo[] array, byte[] rawArray, int index)
+            [Fact]
+            public void ColorToBytes()
+            {
+                Color[] colors = { new Color(0, 1, 2, 3), new Color(4, 5, 6, 7), new Color(8, 9, 10, 11), };
+
+                using (PinnedBuffer<Color> colorBuf = new PinnedBuffer<Color>(colors))
+                using (PinnedBuffer<byte> byteBuf = new PinnedBuffer<byte>(colors.Length*4))
+                {
+                    BufferPointer.Copy<Color>(colorBuf, byteBuf, colorBuf.Count);
+
+                    byte[] a = byteBuf.Array;
+
+                    for (int i = 0; i < byteBuf.Count; i++)
+                    {
+                        Assert.Equal((byte)i, a[i]);
+                    }
+                }
+            }
+
+            internal static bool ElementsAreEqual(Foo[] array, byte[] rawArray, int index)
             {
                 fixed (Foo* pArray = array)
                 fixed (byte* pRaw = rawArray)
@@ -162,6 +402,34 @@ namespace ImageSharp.Tests.Common
                     return val1.Equals(val2);
                 }
             }
+
+            internal static bool ElementsAreEqual(AlignedFoo[] array, byte[] rawArray, int index)
+            {
+                fixed (AlignedFoo* pArray = array)
+                fixed (byte* pRaw = rawArray)
+                {
+                    AlignedFoo* pCasted = (AlignedFoo*)pRaw;
+
+                    AlignedFoo val1 = pArray[index];
+                    AlignedFoo val2 = pCasted[index];
+
+                    return val1.Equals(val2);
+                }
+            }
+
+            internal static bool ElementsAreEqual(int[] array, byte[] rawArray, int index)
+            {
+                fixed (int* pArray = array)
+                fixed (byte* pRaw = rawArray)
+                {
+                    int* pCasted = (int*)pRaw;
+
+                    int val1 = pArray[index];
+                    int val2 = pCasted[index];
+
+                    return val1.Equals(val2);
+                }
+            }
         }
     }
 }

tests/ImageSharp.Tests/Common/PinnedBufferTests.cs

@@ -47,6 +47,21 @@
             }
         }
 
+        [Theory]
+        [InlineData(42)]
+        [InlineData(1111)]
+        public void Clear(int count)
+        {
+            Foo[] a = { new Foo() { A = 1, B = 2 }, new Foo() { A = 3, B = 4 } };
+            using (PinnedBuffer<Foo> buffer = new PinnedBuffer<Foo>(a))
+            {
+                buffer.Clear();
+
+                Assert.Equal(default(Foo), a[0]);
+                Assert.Equal(default(Foo), a[1]);
+            }
+        }
+
         [Fact]
         public void Dispose()
         {

tests/ImageSharp.Tests/Common/PixelDataPoolTests.cs

@@ -3,6 +3,7 @@
 // Licensed under the Apache License, Version 2.0.
 // </copyright>
 
+// ReSharper disable InconsistentNaming
 namespace ImageSharp.Tests
 {
     using System.Linq;
@@ -22,28 +23,6 @@ namespace ImageSharp.Tests
             Assert.True(pixels.Length >= 1024);
         }
 
-        [Fact]
-        public void PixelDataPoolRentsEmptyArray()
-        {
-            for (int i = 16; i < 1024; i += 16)
-            {
-                Color[] pixels = PixelDataPool<Color>.Rent(i);
-
-                Assert.True(pixels.All(p => p == default(Color)));
-
-                PixelDataPool<Color>.Return(pixels);
-            }
-
-            for (int i = 16; i < 1024; i += 16)
-            {
-                Color[] pixels = PixelDataPool<Color>.Rent(i);
-
-                Assert.True(pixels.All(p => p == default(Color)));
-
-                PixelDataPool<Color>.Return(pixels);
-            }
-        }
-
         [Fact]
         public void PixelDataPoolDoesNotThrowWhenReturningNonPooled()
         {
@@ -54,23 +33,6 @@ namespace ImageSharp.Tests
             Assert.True(pixels.Length >= 1024);
         }
 
-        [Fact]
-        public void PixelDataPoolCleansRentedArray()
-        {
-            Color[] pixels = PixelDataPool<Color>.Rent(256);
-
-            for (int i = 0; i < pixels.Length; i++)
-            {
-                pixels[i] = Color.Azure;
-            }
-
-            Assert.True(pixels.All(p => p == Color.Azure));
-
-            PixelDataPool<Color>.Return(pixels);
-
-            Assert.True(pixels.All(p => p == default(Color)));
-        }
-
         [Theory]
         [InlineData(false)]
         [InlineData(true)]

tests/ImageSharp.Tests/Formats/Jpg/JpegUtilityTestFixture.cs

@@ -4,14 +4,13 @@
 // </copyright>
 
 using System.Text;
-using ImageSharp.Formats;
+
 using Xunit.Abstractions;
 // ReSharper disable InconsistentNaming
 
 namespace ImageSharp.Tests
 {
     using System;
-    using System.Collections.Generic;
     using System.Diagnostics;
 
     using ImageSharp.Formats.Jpg;
@@ -99,28 +98,6 @@ namespace ImageSharp.Tests
             this.Output.WriteLine(bld.ToString());
         }
 
-        internal struct ApproximateFloatComparer : IEqualityComparer<float>
-        {
-            private readonly float Eps;
-
-            public ApproximateFloatComparer(float eps = 1f)
-            {
-                this.Eps = eps;
-            }
-
-            public bool Equals(float x, float y)
-            {
-                float d = x - y;
-
-                return d > -this.Eps && d < this.Eps;
-            }
-
-            public int GetHashCode(float obj)
-            {
-                throw new InvalidOperationException();
-            }
-        }
-
         protected void Print(string msg)
         {
             Debug.WriteLine(msg);

tests/ImageSharp.Tests/Image/PixelAccessorTests.cs

@@ -130,16 +130,7 @@ namespace ImageSharp.Tests
                 CopyFromZYX(image);
             }
         }
-
+        
-        [Fact]
-        public void CopyFromZYXOptimized()
-        {
-            using (Image image = new Image(1, 1))
-            {
-                CopyFromZYX(image);
-            }
-        }
-
         [Fact]
         public void CopyFromZYXW()
         {
@@ -148,16 +139,7 @@ namespace ImageSharp.Tests
                 CopyFromZYXW(image);
             }
         }
-
+        
-        [Fact]
-        public void CopyFromZYXWOptimized()
-        {
-            using (Image image = new Image(1, 1))
-            {
-                CopyFromZYXW(image);
-            }
-        }
-
         [Fact]
         public void CopyToZYX()
         {
@@ -166,16 +148,7 @@ namespace ImageSharp.Tests
                 CopyToZYX(image);
             }
         }
-
+        
-        [Fact]
-        public void CopyToZYXOptimized()
-        {
-            using (Image image = new Image(1, 1))
-            {
-                CopyToZYX(image);
-            }
-        }
-
         [Fact]
         public void CopyToZYXW()
         {
@@ -184,16 +157,7 @@ namespace ImageSharp.Tests
                 CopyToZYXW(image);
             }
         }
-
+        
-        [Fact]
-        public void CopyToZYXWOptimized()
-        {
-            using (Image image = new Image(1, 1))
-            {
-                CopyToZYXW(image);
-            }
-        }
-
         private static void CopyFromZYX<TColor>(Image<TColor> image)
             where TColor : struct, IPixel<TColor>
         {

tests/ImageSharp.Tests/TestUtilities/ApproximateFloatComparer.cs

@@ -0,0 +1,38 @@
+namespace ImageSharp.Tests
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Numerics;
+
+    internal struct ApproximateFloatComparer : IEqualityComparer<float>, IEqualityComparer<Vector4>
+    {
+        private readonly float Eps;
+
+        public ApproximateFloatComparer(float eps = 1f)
+        {
+            this.Eps = eps;
+        }
+
+        public bool Equals(float x, float y)
+        {
+            float d = x - y;
+
+            return d > -this.Eps && d < this.Eps;
+        }
+
+        public int GetHashCode(float obj)
+        {
+            throw new InvalidOperationException();
+        }
+
+        public bool Equals(Vector4 a, Vector4 b)
+        {
+            return this.Equals(a.X, b.X) && this.Equals(a.Y, b.Y) && this.Equals(a.Z, b.Z) && this.Equals(a.W, b.W);
+        }
+
+        public int GetHashCode(Vector4 obj)
+        {
+            throw new InvalidOperationException();
+        }
+    }
+}

theme/index.cshtml

@@ -0,0 +1,3 @@
+Title: Home
+---
+Welcome to the documentation for ImageSharp