Split webp encoder into lossless and lossy

src/ImageSharp/Formats/WebP/BitWriter/Vp8LBitWriter.cs

@@ -1,5 +1,5 @@
-// Copyright (c) Six Labors and contributors.
-// Licensed under the GNU Affero General Public License, Version 3.
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
 
 using System;
 using System.Buffers.Binary;

src/ImageSharp/Formats/WebP/Lossless/DominantCostRange.cs

@@ -1,5 +1,5 @@
-// Copyright (c) Six Labors and contributors.
-// Licensed under the GNU Affero General Public License, Version 3.
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
 
 namespace SixLabors.ImageSharp.Formats.WebP.Lossless
 {

src/ImageSharp/Formats/WebP/Lossless/HistogramEncoder.cs

@@ -1,5 +1,5 @@
-// Copyright (c) Six Labors and contributors.
-// Licensed under the GNU Affero General Public License, Version 3.
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
 
 using System;
 using System.Collections.Generic;

src/ImageSharp/Formats/WebP/Lossy/Vp8Encoder.cs

@@ -0,0 +1,46 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using System;
+using System.IO;
+using SixLabors.ImageSharp.Formats.WebP.BitWriter;
+using SixLabors.ImageSharp.Memory;
+using SixLabors.ImageSharp.PixelFormats;
+
+namespace SixLabors.ImageSharp.Formats.WebP.Lossy
+{
+    /// <summary>
+    /// Encoder for lossy webp images.
+    /// </summary>
+    internal class Vp8Encoder
+    {
+        /// <summary>
+        /// The <see cref="MemoryAllocator"/> to use for buffer allocations.
+        /// </summary>
+        private MemoryAllocator memoryAllocator;
+
+        /// <summary>
+        /// A bit writer for writing lossy webp streams.
+        /// </summary>
+        private Vp8BitWriter bitWriter;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Vp8Encoder"/> class.
+        /// </summary>
+        /// <param name="memoryAllocator">The memory allocator.</param>
+        /// <param name="width">The width of the input image.</param>
+        /// <param name="height">The height of the input image.</param>
+        public Vp8Encoder(MemoryAllocator memoryAllocator, int width, int height)
+        {
+            this.memoryAllocator = memoryAllocator;
+
+            // TODO: initialize bitwriter
+        }
+
+        public void Encode<TPixel>(Image<TPixel> image, Stream stream)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

src/ImageSharp/Formats/WebP/WebPEncoder.cs

@@ -1,14 +1,15 @@
-// Copyright (c) Six Labors and contributors.
-// Licensed under the GNU Affero General Public License, Version 3.
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
 
 using System.IO;
+using System.Threading.Tasks;
 using SixLabors.ImageSharp.Advanced;
 using SixLabors.ImageSharp.PixelFormats;
 
 namespace SixLabors.ImageSharp.Formats.WebP
 {
     /// <summary>
-    ///  Image encoder for writing an image to a stream in the WebP format.
+    /// Image encoder for writing an image to a stream in the WebP format.
     /// </summary>
     public sealed class WebPEncoder : IImageEncoder, IWebPEncoderOptions
     {
@@ -34,5 +35,13 @@ namespace SixLabors.ImageSharp.Formats.WebP
             var encoder = new WebPEncoderCore(this, image.GetMemoryAllocator());
             encoder.Encode(image, stream);
         }
+
+        /// <inheritdoc/>
+        public Task EncodeAsync<TPixel>(Image<TPixel> image, Stream stream)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            var encoder = new WebPEncoderCore(this, image.GetMemoryAllocator());
+            return encoder.EncodeAsync(image, stream);
+        }
     }
 }