Merge pull request #49 from olivif/olivif/fixwarnings2

Adding missing documentation and fixing style issues - part 2

src/ImageSharp/Common/Helpers/Guard.cs

@@ -65,6 +65,7 @@ namespace ImageSharp
         /// <summary>
         /// Verifies, that the enumeration is not null and not empty.
         /// </summary>
+        /// <typeparam name="T">The type of objects in the <paramref name="target"/></typeparam>
         /// <param name="target">The target enumeration, which should be checked against being null or empty.</param>
         /// <param name="parameterName">Name of the parameter.</param>
         /// <param name="message">The error message, if any to add to the exception.</param>

src/ImageSharp/Drawing/Brushes/Brushes`2.cs → src/ImageSharp/Drawing/Brushes/Brushes{TColor,TPacked}.cs

@@ -1,4 +1,4 @@
-// <copyright file="Brushes`2.cs" company="James Jackson-South">
+// <copyright file="Brushes{TColor,TPacked}.cs" company="James Jackson-South">
 // Copyright (c) James Jackson-South and contributors.
 // Licensed under the Apache License, Version 2.0.
 // </copyright>

src/ImageSharp/Drawing/Brushes/ImageBrush`2.cs → src/ImageSharp/Drawing/Brushes/ImageBrush{TColor,TPacked}.cs

@@ -1,4 +1,4 @@
-// <copyright file="ImageBrush`2.cs" company="James Jackson-South">
+// <copyright file="ImageBrush{TColor,TPacked}.cs" company="James Jackson-South">
 // Copyright (c) James Jackson-South and contributors.
 // Licensed under the Apache License, Version 2.0.
 // </copyright>

src/ImageSharp/Drawing/Brushes/PatternBrush`2.cs → src/ImageSharp/Drawing/Brushes/PatternBrush{TColor,TPacked}.cs

@@ -1,4 +1,4 @@
-// <copyright file="PatternBrush`2.cs" company="James Jackson-South">
+// <copyright file="PatternBrush{TColor,TPacked}.cs" company="James Jackson-South">
 // Copyright (c) James Jackson-South and contributors.
 // Licensed under the Apache License, Version 2.0.
 // </copyright>

src/ImageSharp/Drawing/Brushes/SolidBrush`2.cs → src/ImageSharp/Drawing/Brushes/SolidBrush{TColor,TPacked}.cs

@@ -1,4 +1,4 @@
-// <copyright file="SolidBrush`2.cs" company="James Jackson-South">
+// <copyright file="SolidBrush{TColor,TPacked}.cs" company="James Jackson-South">
 // Copyright (c) James Jackson-South and contributors.
 // Licensed under the Apache License, Version 2.0.
 // </copyright>

src/ImageSharp/Drawing/Processors/FillShapeProcessor.cs

@@ -88,7 +88,7 @@ namespace ImageSharp.Drawing.Processors
                     int offsetY = y - polyStartY;
 
                     Vector2 currentPoint = default(Vector2);
-                    Vector2 currentPointOffset = default(Vector2);
+
                     for (int x = minX; x < maxX; x++)
                     {
                         int offsetX = x - startX;

src/ImageSharp/Formats/Jpg/Components/Bits.cs

@@ -45,7 +45,11 @@ namespace ImageSharp.Formats
             {
                 JpegDecoderCore.ErrorCodes errorCode;
 
-                byte c = decoder.Bytes.ReadByteStuffedByte(decoder.InputStream, out errorCode);
+                // Grab the decode bytes, use them and then set them
+                // back on the decoder.
+                var decoderBytes = decoder.Bytes;
+                byte c = decoderBytes.ReadByteStuffedByte(decoder.InputStream, out errorCode);
+                decoder.Bytes = decoderBytes;
 
                 if (errorCode != JpegDecoderCore.ErrorCodes.NoError)
                 {

src/ImageSharp/Formats/Jpg/Components/Block8x8F.cs

@@ -15,9 +15,17 @@ namespace ImageSharp.Formats
     /// </summary>
     internal partial struct Block8x8F
     {
+        /// <summary>
+        /// Vector count
+        /// </summary>
         public const int VectorCount = 16;
+
+        /// <summary>
+        /// Scalar count
+        /// </summary>
         public const int ScalarCount = VectorCount * 4;
 
+#pragma warning disable SA1600 // ElementsMustBeDocumented
         public Vector4 V0L;
         public Vector4 V0R;
 
@@ -41,6 +49,7 @@ namespace ImageSharp.Formats
 
         public Vector4 V7L;
         public Vector4 V7R;
+#pragma warning restore SA1600 // ElementsMustBeDocumented
 
 #pragma warning disable SA1310 // FieldNamesMustNotContainUnderscore
         private static readonly Vector4 C_1_175876 = new Vector4(1.175876f);
@@ -59,6 +68,11 @@ namespace ImageSharp.Formats
         private static readonly Vector4 C_0_125 = new Vector4(0.1250f);
 #pragma warning restore SA1310 // FieldNamesMustNotContainUnderscore
 
+        /// <summary>
+        /// Index into the block
+        /// </summary>
+        /// <param name="idx">The index</param>
+        /// <returns>The float value at the specified index</returns>
         public unsafe float this[int idx]
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -143,25 +157,29 @@ namespace ImageSharp.Formats
             }
         }
 
+        /// <summary>
+        /// Multiply in place
+        /// </summary>
+        /// <param name="scalar">Scalar to multiply by</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public void MultiplyAllInplace(Vector4 s)
+        public void MultiplyAllInplace(Vector4 scalar)
         {
-            this.V0L *= s;
-            this.V0R *= s;
-            this.V1L *= s;
-            this.V1R *= s;
-            this.V2L *= s;
-            this.V2R *= s;
-            this.V3L *= s;
-            this.V3R *= s;
-            this.V4L *= s;
-            this.V4R *= s;
-            this.V5L *= s;
-            this.V5R *= s;
-            this.V6L *= s;
-            this.V6R *= s;
-            this.V7L *= s;
-            this.V7R *= s;
+            this.V0L *= scalar;
+            this.V0R *= scalar;
+            this.V1L *= scalar;
+            this.V1R *= scalar;
+            this.V2L *= scalar;
+            this.V2R *= scalar;
+            this.V3L *= scalar;
+            this.V3R *= scalar;
+            this.V4L *= scalar;
+            this.V4R *= scalar;
+            this.V5L *= scalar;
+            this.V5R *= scalar;
+            this.V6L *= scalar;
+            this.V6R *= scalar;
+            this.V7L *= scalar;
+            this.V7R *= scalar;
         }
 
         /// <summary>
@@ -381,7 +399,7 @@ namespace ImageSharp.Formats
         internal void Clear()
         {
             // The cheapest way to do this in C#:
-            this = new Block8x8F();
+            this = default(Block8x8F);
         }
 
         /// <summary>

src/ImageSharp/Formats/Jpg/Components/Bytes.cs

@@ -23,8 +23,14 @@ namespace ImageSharp.Formats
         /// </summary>
         public byte[] Buffer;
 
+        /// <summary>
+        /// Start of bytes read
+        /// </summary>
         public int I;
 
+        /// <summary>
+        /// End of bytes read
+        /// </summary>
         public int J;
 
         /// <summary>
@@ -44,6 +50,9 @@ namespace ImageSharp.Formats
             return new Bytes { Buffer = ArrayPool.Rent(4096) };
         }
 
+        /// <summary>
+        /// Disposes of the underlying buffer
+        /// </summary>
         public void Dispose()
         {
             if (this.Buffer != null)

src/ImageSharp/Formats/Jpg/Components/Huffman.cs

@@ -53,6 +53,12 @@ namespace ImageSharp.Formats
 
         private static readonly ArrayPool<int> IntBuffer = ArrayPool<int>.Create(JpegDecoderCore.MaxCodeLength, 50);
 
+        /// <summary>
+        /// Initializes the Huffman tree
+        /// </summary>
+        /// <param name="lutSize">Lut size</param>
+        /// <param name="maxNCodes">Max N codes</param>
+        /// <param name="maxCodeLength">Max code length</param>
         public void Init(int lutSize, int maxNCodes, int maxCodeLength)
         {
             this.Lut = UshortBuffer.Rent(1 << lutSize);
@@ -62,6 +68,9 @@ namespace ImageSharp.Formats
             this.Indices = IntBuffer.Rent(maxCodeLength);
         }
 
+        /// <summary>
+        /// Disposes the underlying buffers
+        /// </summary>
         public void Dispose()
         {
             UshortBuffer.Return(this.Lut, true);

src/ImageSharp/Formats/Jpg/Components/MutableSpan.cs

@@ -5,7 +5,6 @@
 
 namespace ImageSharp.Formats
 {
-    using System.Numerics;
     using System.Runtime.CompilerServices;
 
     /// <summary>
@@ -15,27 +14,51 @@ namespace ImageSharp.Formats
     /// <see>
     ///     <cref>https://github.com/dotnet/corefxlab/blob/master/src/System.Slices/System/Span.cs</cref>
     /// </see>
-    /// <typeparam name="T"></typeparam>
+    /// <typeparam name="T">The type of the data in the span</typeparam>
     internal struct MutableSpan<T>
     {
+        /// <summary>
+        /// Data
+        /// </summary>
         public T[] Data;
 
+        /// <summary>
+        /// Offset
+        /// </summary>
         public int Offset;
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MutableSpan{T}"/> struct.
+        /// </summary>
+        /// <param name="size">The size of the span</param>
+        /// <param name="offset">The offset (defaults to 0)</param>
         public MutableSpan(int size, int offset = 0)
         {
             this.Data = new T[size];
             this.Offset = offset;
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MutableSpan{T}"/> struct.
+        /// </summary>
+        /// <param name="data">The data</param>
+        /// <param name="offset">The offset (defaults to 0)</param>
         public MutableSpan(T[] data, int offset = 0)
         {
             this.Data = data;
             this.Offset = offset;
         }
 
+        /// <summary>
+        /// Gets the total count of data
+        /// </summary>
         public int TotalCount => this.Data.Length - this.Offset;
 
+        /// <summary>
+        /// Index into the data
+        /// </summary>
+        /// <param name="idx">The data</param>
+        /// <returns>The value at the specified index</returns>
         public T this[int idx]
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -53,57 +76,25 @@ namespace ImageSharp.Formats
 
         public static implicit operator MutableSpan<T>(T[] data) => new MutableSpan<T>(data, 0);
 
+        /// <summary>
+        /// Slice the data
+        /// </summary>
+        /// <param name="offset">The offset</param>
+        /// <returns>The new <see cref="MutableSpan{T}"/></returns>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public MutableSpan<T> Slice(int offset)
         {
             return new MutableSpan<T>(this.Data, this.Offset + offset);
         }
 
+        /// <summary>
+        /// Add to the offset
+        /// </summary>
+        /// <param name="offset">The additional offset</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void AddOffset(int offset)
         {
             this.Offset += offset;
         }
     }
-
-    internal static class MutableSpanExtensions
-    {
-        public static MutableSpan<T> Slice<T>(this T[] array, int offset) => new MutableSpan<T>(array, offset);
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void SaveTo(this MutableSpan<float> data, ref Vector4 v)
-        {
-            v.X = data[0];
-            v.Y = data[1];
-            v.Z = data[2];
-            v.W = data[3];
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void SaveTo(this MutableSpan<int> data, ref Vector4 v)
-        {
-            v.X = data[0];
-            v.Y = data[1];
-            v.Z = data[2];
-            v.W = data[3];
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void LoadFrom(this MutableSpan<float> data, ref Vector4 v)
-        {
-            data[0] = v.X;
-            data[1] = v.Y;
-            data[2] = v.Z;
-            data[3] = v.W;
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void LoadFrom(this MutableSpan<int> data, ref Vector4 v)
-        {
-            data[0] = (int)v.X;
-            data[1] = (int)v.Y;
-            data[2] = (int)v.Z;
-            data[3] = (int)v.W;
-        }
-    }
 }

src/ImageSharp/Formats/Jpg/Components/MutableSpanExtensions.cs

@@ -0,0 +1,81 @@
+// <copyright file="MutableSpanExtensions.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats.Jpg.Components
+{
+    using System.Numerics;
+    using System.Runtime.CompilerServices;
+
+    /// <summary>
+    /// MutableSpan Extensions
+    /// </summary>
+    internal static class MutableSpanExtensions
+    {
+        /// <summary>
+        /// Slice <see cref="MutableSpan{T}"/>
+        /// </summary>
+        /// <typeparam name="T">The type of the data in the span</typeparam>
+        /// <param name="array">The data array</param>
+        /// <param name="offset">The offset</param>
+        /// <returns>The new <see cref="MutableSpan{T}"/></returns>
+        public static MutableSpan<T> Slice<T>(this T[] array, int offset) => new MutableSpan<T>(array, offset);
+
+        /// <summary>
+        /// Save to a Vector4
+        /// </summary>
+        /// <param name="data">The data</param>
+        /// <param name="v">The vector to save to</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void SaveTo(this MutableSpan<float> data, ref Vector4 v)
+        {
+            v.X = data[0];
+            v.Y = data[1];
+            v.Z = data[2];
+            v.W = data[3];
+        }
+
+        /// <summary>
+        /// Save to a Vector4
+        /// </summary>
+        /// <param name="data">The data</param>
+        /// <param name="v">The vector to save to</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void SaveTo(this MutableSpan<int> data, ref Vector4 v)
+        {
+            v.X = data[0];
+            v.Y = data[1];
+            v.Z = data[2];
+            v.W = data[3];
+        }
+
+        /// <summary>
+        /// Load from Vector4
+        /// </summary>
+        /// <param name="data">The data</param>
+        /// <param name="v">The vector to load from</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void LoadFrom(this MutableSpan<float> data, ref Vector4 v)
+        {
+            data[0] = v.X;
+            data[1] = v.Y;
+            data[2] = v.Z;
+            data[3] = v.W;
+        }
+
+        /// <summary>
+        /// Load from Vector4
+        /// </summary>
+        /// <param name="data">The data</param>
+        /// <param name="v">The vector to load from</param>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void LoadFrom(this MutableSpan<int> data, ref Vector4 v)
+        {
+            data[0] = (int)v.X;
+            data[1] = (int)v.Y;
+            data[2] = (int)v.Z;
+            data[3] = (int)v.W;
+        }
+    }
+}

src/ImageSharp/Formats/Jpg/Components/YCbCrImage.cs

@@ -44,16 +44,34 @@ namespace ImageSharp.Formats
         /// </summary>
         public enum YCbCrSubsampleRatio
         {
+            /// <summary>
+            /// YCbCrSubsampleRatio444
+            /// </summary>
             YCbCrSubsampleRatio444,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio422
+            /// </summary>
             YCbCrSubsampleRatio422,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio420
+            /// </summary>
             YCbCrSubsampleRatio420,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio440
+            /// </summary>
             YCbCrSubsampleRatio440,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio411
+            /// </summary>
             YCbCrSubsampleRatio411,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio410
+            /// </summary>
             YCbCrSubsampleRatio410,
         }
 

src/ImageSharp/Formats/Jpg/JpegDecoderCore.cs

@@ -31,21 +31,6 @@ namespace ImageSharp.Formats
         /// </summary>
         internal const int LutSize = 8;
 
-        /// <summary>
-        /// The byte buffer.
-        /// </summary>
-        internal Bytes Bytes;
-
-        /// <summary>
-        /// The input stream.
-        /// </summary>
-        internal Stream InputStream;
-
-        /// <summary>
-        /// Holds the unprocessed bits that have been taken from the byte-stream.
-        /// </summary>
-        internal Bits Bits;
-
         /// <summary>
         /// The maximum number of color components
         /// </summary>
@@ -116,6 +101,21 @@ namespace ImageSharp.Formats
         /// </summary>
         private readonly byte[] temp;
 
+        /// <summary>
+        /// The byte buffer.
+        /// </summary>
+        private Bytes bytes;
+
+        /// <summary>
+        /// The byte buffer.
+        /// </summary>
+        private Stream inputStream;
+
+        /// <summary>
+        /// Holds the unprocessed bits that have been taken from the byte-stream.
+        /// </summary>
+        private Bits bits;
+
         /// <summary>
         /// The image width
         /// </summary>
@@ -205,8 +205,8 @@ namespace ImageSharp.Formats
             this.temp = new byte[2 * BlockF.BlockSize];
             this.componentArray = new Component[MaxComponents];
             this.progCoeffs = new Block8x8F[MaxComponents][];
-            this.Bits = default(Bits);
-            this.Bytes = Bytes.Create();
+            this.bits = default(Bits);
+            this.bytes = Bytes.Create();
 
             // TODO: This looks like it could be static.
             for (int i = 0; i < MaxTc + 1; i++)
@@ -224,10 +224,44 @@ namespace ImageSharp.Formats
         /// </summary>
         internal enum ErrorCodes
         {
+            /// <summary>
+            /// NoError
+            /// </summary>
             NoError,
+
+            /// <summary>
+            /// MissingFF00
+            /// </summary>
             MissingFF00
         }
 
+        /// <summary>
+        /// Gets or sets the byte buffer.
+        /// </summary>
+        public Bytes Bytes
+        {
+            get
+            {
+                return this.bytes;
+            }
+
+            set
+            {
+                this.bytes = value;
+            }
+        }
+
+        /// <summary>
+        /// Gets the input stream.
+        /// </summary>
+        public Stream InputStream
+        {
+            get
+            {
+                return this.inputStream;
+            }
+        }
+
         /// <summary>
         /// Decodes the image from the specified this._stream and sets
         /// the data to image.
@@ -241,7 +275,7 @@ namespace ImageSharp.Formats
             where TColor : struct, IPackedPixel<TPacked>
             where TPacked : struct, IEquatable<TPacked>
         {
-            this.InputStream = stream;
+            this.inputStream = stream;
 
             // Check for the Start Of Image marker.
             this.ReadFull(this.temp, 0, 2);
@@ -381,7 +415,7 @@ namespace ImageSharp.Formats
                         this.ProcessApp14Marker(remaining);
                         break;
                     default:
-                        if ((JpegConstants.Markers.APP0 <= marker && marker <= JpegConstants.Markers.APP15)
+                        if ((marker >= JpegConstants.Markers.APP0 && marker <= JpegConstants.Markers.APP15)
                             || marker == JpegConstants.Markers.COM)
                         {
                             this.Skip(remaining);
@@ -449,6 +483,9 @@ namespace ImageSharp.Formats
             }
         }
 
+        /// <summary>
+        /// Dispose
+        /// </summary>
         public void Dispose()
         {
             for (int i = 0; i < this.huffmanTrees.Length; i++)
@@ -456,7 +493,7 @@ namespace ImageSharp.Formats
                 this.huffmanTrees[i].Dispose();
             }
 
-            this.Bytes.Dispose();
+            this.bytes.Dispose();
         }
 
         /// <summary>
@@ -466,7 +503,7 @@ namespace ImageSharp.Formats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal byte ReadByte()
         {
-            return this.Bytes.ReadByte(this.InputStream);
+            return this.bytes.ReadByte(this.inputStream);
         }
 
         /// <summary>
@@ -627,19 +664,19 @@ namespace ImageSharp.Formats
                 throw new ImageFormatException("Uninitialized Huffman table");
             }
 
-            if (this.Bits.UnreadBits < 8)
+            if (this.bits.UnreadBits < 8)
             {
-                var errorCode = this.Bits.EnsureNBits(8, this);
+                var errorCode = this.bits.EnsureNBits(8, this);
 
                 if (errorCode == ErrorCodes.NoError)
                 {
-                    ushort v = huffman.Lut[(this.Bits.Accumulator >> (this.Bits.UnreadBits - LutSize)) & 0xff];
+                    ushort v = huffman.Lut[(this.bits.Accumulator >> (this.bits.UnreadBits - LutSize)) & 0xff];
 
                     if (v != 0)
                     {
                         byte n = (byte)((v & 0xff) - 1);
-                        this.Bits.UnreadBits -= n;
-                        this.Bits.Mask >>= n;
+                        this.bits.UnreadBits -= n;
+                        this.bits.Mask >>= n;
                         return (byte)(v >> 8);
                     }
                 }
@@ -652,22 +689,22 @@ namespace ImageSharp.Formats
             int code = 0;
             for (int i = 0; i < MaxCodeLength; i++)
             {
-                if (this.Bits.UnreadBits == 0)
+                if (this.bits.UnreadBits == 0)
                 {
-                    var errorCode = this.Bits.EnsureNBits(1, this);
+                    var errorCode = this.bits.EnsureNBits(1, this);
                     if (errorCode != ErrorCodes.NoError)
                     {
                         throw new MissingFF00Exception();
                     }
                 }
 
-                if ((this.Bits.Accumulator & this.Bits.Mask) != 0)
+                if ((this.bits.Accumulator & this.bits.Mask) != 0)
                 {
                     code |= 1;
                 }
 
-                this.Bits.UnreadBits--;
-                this.Bits.Mask >>= 1;
+                this.bits.UnreadBits--;
+                this.bits.Mask >>= 1;
 
                 if (code <= huffman.MaxCodes[i])
                 {
@@ -686,18 +723,18 @@ namespace ImageSharp.Formats
         /// <returns>The <see cref="bool"/></returns>
         private bool DecodeBit()
         {
-            if (this.Bits.UnreadBits == 0)
+            if (this.bits.UnreadBits == 0)
             {
-                var errorCode = this.Bits.EnsureNBits(1, this);
+                var errorCode = this.bits.EnsureNBits(1, this);
                 if (errorCode != ErrorCodes.NoError)
                 {
                     throw new MissingFF00Exception();
                 }
             }
 
-            bool ret = (this.Bits.Accumulator & this.Bits.Mask) != 0;
-            this.Bits.UnreadBits--;
-            this.Bits.Mask >>= 1;
+            bool ret = (this.bits.Accumulator & this.bits.Mask) != 0;
+            this.bits.UnreadBits--;
+            this.bits.Mask >>= 1;
             return ret;
         }
 
@@ -708,19 +745,19 @@ namespace ImageSharp.Formats
         /// <returns>The <see cref="uint"/></returns>
         private uint DecodeBits(int count)
         {
-            if (this.Bits.UnreadBits < count)
+            if (this.bits.UnreadBits < count)
             {
-                var errorCode = this.Bits.EnsureNBits(count, this);
+                var errorCode = this.bits.EnsureNBits(count, this);
                 if (errorCode != ErrorCodes.NoError)
                 {
                     throw new MissingFF00Exception();
                 }
             }
 
-            uint ret = this.Bits.Accumulator >> (this.Bits.UnreadBits - count);
+            uint ret = this.bits.Accumulator >> (this.bits.UnreadBits - count);
             ret = (uint)(ret & ((1 << count) - 1));
-            this.Bits.UnreadBits -= count;
-            this.Bits.Mask >>= count;
+            this.bits.UnreadBits -= count;
+            this.bits.Mask >>= count;
             return ret;
         }
 
@@ -733,13 +770,13 @@ namespace ImageSharp.Formats
         /// </summary>
         private void UnreadByteStuffedByte()
         {
-            this.Bytes.I -= this.Bytes.UnreadableBytes;
-            this.Bytes.UnreadableBytes = 0;
-            if (this.Bits.UnreadBits >= 8)
+            this.bytes.I -= this.bytes.UnreadableBytes;
+            this.bytes.UnreadableBytes = 0;
+            if (this.bits.UnreadBits >= 8)
             {
-                this.Bits.Accumulator >>= 8;
-                this.Bits.UnreadBits -= 8;
-                this.Bits.Mask >>= 8;
+                this.bits.Accumulator >>= 8;
+                this.bits.UnreadBits -= 8;
+                this.bits.Mask >>= 8;
             }
         }
 
@@ -752,32 +789,32 @@ namespace ImageSharp.Formats
         private void ReadFull(byte[] data, int offset, int length)
         {
             // Unread the overshot bytes, if any.
-            if (this.Bytes.UnreadableBytes != 0)
+            if (this.bytes.UnreadableBytes != 0)
             {
-                if (this.Bits.UnreadBits >= 8)
+                if (this.bits.UnreadBits >= 8)
                 {
                     this.UnreadByteStuffedByte();
                 }
 
-                this.Bytes.UnreadableBytes = 0;
+                this.bytes.UnreadableBytes = 0;
             }
 
             while (length > 0)
             {
-                if (this.Bytes.J - this.Bytes.I >= length)
+                if (this.bytes.J - this.bytes.I >= length)
                 {
-                    Array.Copy(this.Bytes.Buffer, this.Bytes.I, data, offset, length);
-                    this.Bytes.I += length;
+                    Array.Copy(this.bytes.Buffer, this.bytes.I, data, offset, length);
+                    this.bytes.I += length;
                     length -= length;
                 }
                 else
                 {
-                    Array.Copy(this.Bytes.Buffer, this.Bytes.I, data, offset, this.Bytes.J - this.Bytes.I);
-                    offset += this.Bytes.J - this.Bytes.I;
-                    length -= this.Bytes.J - this.Bytes.I;
-                    this.Bytes.I += this.Bytes.J - this.Bytes.I;
+                    Array.Copy(this.bytes.Buffer, this.bytes.I, data, offset, this.bytes.J - this.bytes.I);
+                    offset += this.bytes.J - this.bytes.I;
+                    length -= this.bytes.J - this.bytes.I;
+                    this.bytes.I += this.bytes.J - this.bytes.I;
 
-                    this.Bytes.Fill(this.InputStream);
+                    this.bytes.Fill(this.inputStream);
                 }
             }
         }
@@ -789,32 +826,32 @@ namespace ImageSharp.Formats
         private void Skip(int count)
         {
             // Unread the overshot bytes, if any.
-            if (this.Bytes.UnreadableBytes != 0)
+            if (this.bytes.UnreadableBytes != 0)
             {
-                if (this.Bits.UnreadBits >= 8)
+                if (this.bits.UnreadBits >= 8)
                 {
                     this.UnreadByteStuffedByte();
                 }
 
-                this.Bytes.UnreadableBytes = 0;
+                this.bytes.UnreadableBytes = 0;
             }
 
             while (true)
             {
-                int m = this.Bytes.J - this.Bytes.I;
+                int m = this.bytes.J - this.bytes.I;
                 if (m > count)
                 {
                     m = count;
                 }
 
-                this.Bytes.I += m;
+                this.bytes.I += m;
                 count -= m;
                 if (count == 0)
                 {
                     break;
                 }
 
-                this.Bytes.Fill(this.InputStream);
+                this.bytes.Fill(this.inputStream);
             }
         }
 
@@ -1478,7 +1515,7 @@ namespace ImageSharp.Formats
                 ah = this.temp[3 + scanComponentCountX2] >> 4;
                 al = this.temp[3 + scanComponentCountX2] & 0x0f;
 
-                if ((zigStart == 0 && zigEnd != 0) || zigStart > zigEnd || BlockF.BlockSize <= zigEnd)
+                if ((zigStart == 0 && zigEnd != 0) || zigStart > zigEnd || zigEnd >= BlockF.BlockSize)
                 {
                     throw new ImageFormatException("Bad spectral selection bounds");
                 }
@@ -1520,7 +1557,7 @@ namespace ImageSharp.Formats
                 }
             }
 
-            this.Bits = default(Bits);
+            this.bits = default(Bits);
 
             int mcu = 0;
             byte expectedRst = JpegConstants.Markers.RST0;
@@ -1533,12 +1570,12 @@ namespace ImageSharp.Formats
             // blocks: the third block in the first row has (bx, by) = (2, 0).
             int bx, by, blockCount = 0;
 
-            Block8x8F b = new Block8x8F();
-            Block8x8F temp1 = new Block8x8F();
-            Block8x8F temp2 = new Block8x8F();
+            Block8x8F b = default(Block8x8F);
+            Block8x8F temp1 = default(Block8x8F);
+            Block8x8F temp2 = default(Block8x8F);
 
             // Tricky way to copy contents of the Unzig static variable to the stack:
-            StackallocUnzigData unzigOnStack = new StackallocUnzigData();
+            StackallocUnzigData unzigOnStack = default(StackallocUnzigData);
             int* unzigPtr = unzigOnStack.Data;
             Marshal.Copy(Unzig, 0, (IntPtr)unzigPtr, 64);
 
@@ -1673,7 +1710,7 @@ namespace ImageSharp.Formats
                         }
 
                         // Reset the Huffman decoder.
-                        this.Bits = default(Bits);
+                        this.bits = default(Bits);
 
                         // Reset the DC components, as per section F.2.1.3.1.
                         dc = new int[MaxComponents];
@@ -1728,7 +1765,7 @@ namespace ImageSharp.Formats
                         throw new ImageFormatException("Excessive DC component");
                     }
 
-                    int deltaDC = this.Bits.ReceiveExtend(value, this);
+                    int deltaDC = this.bits.ReceiveExtend(value, this);
                     dc[compIndex] += deltaDC;
 
                     // b[0] = dc[compIndex] << al;
@@ -1756,7 +1793,7 @@ namespace ImageSharp.Formats
                                 break;
                             }
 
-                            int ac = this.Bits.ReceiveExtend(val1, this);
+                            int ac = this.bits.ReceiveExtend(val1, this);
 
                             // b[Unzig[zig]] = ac << al;
                             Block8x8F.SetScalarAt(b, unzigPtr[zig], ac << al);

src/ImageSharp/Formats/Jpg/JpegEncoderCore.cs

@@ -31,6 +31,7 @@ namespace ImageSharp.Formats
             39, 46, 53, 60, 61, 54, 47, 55, 62, 63,
         };
 
+#pragma warning disable SA1118 // ParameterMustNotSpanMultipleLines
         /// <summary>
         /// The Huffman encoding specifications.
         /// This encoder uses the same Huffman encoding for all images.
@@ -43,7 +44,10 @@ namespace ImageSharp.Formats
                 {
                     0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0
                 },
-                new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }),
+                new byte[]
+                {
+                    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
+                }),
             new HuffmanSpec(
                 new byte[]
                 {
@@ -75,7 +79,10 @@ namespace ImageSharp.Formats
                 {
                     0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0
                 },
-                new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }),
+                new byte[]
+                {
+                    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
+                }),
 
             // Chrominance AC.
             new HuffmanSpec(
@@ -105,6 +112,7 @@ namespace ImageSharp.Formats
                     0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa
                 })
         };
+#pragma warning restore SA1118 // ParameterMustNotSpanMultipleLines
 
         /// <summary>
         /// The compiled representations of theHuffmanSpec.
@@ -960,11 +968,6 @@ namespace ImageSharp.Formats
         /// </summary>
         private class HuffmanLut
         {
-            /// <summary>
-            /// The collection of huffman values.
-            /// </summary>
-            public readonly uint[] Values;
-
             /// <summary>
             /// Initializes a new instance of the <see cref="HuffmanLut"/> class.
             /// </summary>
@@ -999,6 +1002,11 @@ namespace ImageSharp.Formats
                     code <<= 1;
                 }
             }
+
+            /// <summary>
+            /// Gets the collection of huffman values.
+            /// </summary>
+            public uint[] Values { get; }
         }
     }
 }

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

@@ -56,11 +56,9 @@ namespace ImageSharp.Tests.Formats.Jpg
             float a0, a1, a2, a3, b0, b1, b2, b3;
             float z0, z1, z2, z3, z4;
 
-            float r0 = 1.414214f;
             float r1 = 1.387040f;
             float r2 = 1.306563f;
             float r3 = 1.175876f;
-            float r4 = 1.000000f;
             float r5 = 0.785695f;
             float r6 = 0.541196f;
             float r7 = 0.275899f;