[WIP] Implement Tiff codec

src/ImageSharp.Formats.Tiff/AssemblyInfo.cs

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+// <copyright file="AssemblyInfo.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+
+// Ensure the internals can be tested.
+[assembly: InternalsVisibleTo("ImageSharp.Formats.Tiff.Tests")]

src/ImageSharp.Formats.Tiff/ITiffEncoderOptions.cs

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+// <copyright file="ITiffEncoderOptions.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Encapsulates the options for the <see cref="TiffEncoder"/>.
+    /// </summary>
+    public interface ITiffEncoderOptions : IEncoderOptions
+    {
+    }
+}

src/ImageSharp.Formats.Tiff/ImageSharp.Formats.Tiff.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard1.1</TargetFramework>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.Buffers" Version="4.0.0" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.0.0" />
+    <PackageReference Include="System.Numerics.Vectors" Version="4.1.1" />
+    <PackageReference Include="System.Threading.Tasks.Parallel" Version="4.0.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Include="..\ImageSharp\**\*.cs" Exclude="..\ImageSharp\obj\**\*.cs" />
+  </ItemGroup>
+
+</Project>

src/ImageSharp.Formats.Tiff/TiffConstants.cs

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+// <copyright file="TiffConstants.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    using System.Text;
+
+    /// <summary>
+    /// Defines constants defined in the TIFF specification.
+    /// </summary>
+    internal static class TiffConstants
+    {
+        /// <summary>
+        /// Byte order markers for indicating little endian encoding.
+        /// </summary>
+        public const byte ByteOrderLittleEndian = 0x49;
+
+        /// <summary>
+        /// Byte order markers for indicating big endian encoding.
+        /// </summary>
+        public const byte ByteOrderBigEndian = 0x4D;
+
+        /// <summary>
+        /// Magic number used within the image file header to identify a TIFF format file.
+        /// </summary>
+        public const ushort HeaderMagicNumber = 42;
+
+        /// <summary>
+        /// Size (in bytes) of the TIFF file header.
+        /// </summary>
+        public const int SizeOfTiffHeader = 8;
+
+        /// <summary>
+        /// Size (in bytes) of each individual TIFF IFD entry
+        /// </summary>
+        public const int SizeOfIfdEntry = 12;
+
+        /// <summary>
+        /// Size (in bytes) of the Short and SShort data types
+        /// </summary>
+        public const int SizeOfShort = 2;
+
+        /// <summary>
+        /// Size (in bytes) of the Long and SLong data types
+        /// </summary>
+        public const int SizeOfLong = 4;
+
+        /// <summary>
+        /// Size (in bytes) of the Rational and SRational data types
+        /// </summary>
+        public const int SizeOfRational = 8;
+
+        /// <summary>
+        /// Size (in bytes) of the Float data type
+        /// </summary>
+        public const int SizeOfFloat = 4;
+
+        /// <summary>
+        /// Size (in bytes) of the Double data type
+        /// </summary>
+        public const int SizeOfDouble = 8;
+    }
+}

src/ImageSharp.Formats.Tiff/TiffDecoder.cs

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+// <copyright file="TiffDecoder.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    using System;
+    using System.IO;
+
+    /// <summary>
+    /// Image decoder for generating an image out of a TIFF stream.
+    /// </summary>
+    public class TiffDecoder : IImageDecoder
+    {
+        /// <inheritdoc/>
+        public void Decode<TColor>(Image<TColor> image, Stream stream, IDecoderOptions options)
+            where TColor : struct, IPixel<TColor>
+        {
+            Guard.NotNull(image, "image");
+            Guard.NotNull(stream, "stream");
+
+            using (TiffDecoderCore decoder = new TiffDecoderCore(options))
+            {
+                decoder.Decode(image, stream, false);
+            }
+        }
+    }
+}