Add to the metadata, if the image is lossy or lossless and also if a animation is present

src/ImageSharp/Formats/WebP/WebPDecoderCore.cs

@@ -47,6 +47,11 @@ namespace SixLabors.ImageSharp.Formats.WebP
         /// </summary>
         private ImageMetadata metadata;
 
+        /// <summary>
+        /// The webp specific metadata.
+        /// </summary>
+        private WebPMetadata webpMetadata;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="WebPDecoderCore"/> class.
         /// </summary>
@@ -120,9 +125,8 @@ namespace SixLabors.ImageSharp.Formats.WebP
 
         private WebPImageInfo ReadVp8Info()
         {
-            var metadata = new ImageMetadata();
-            WebPMetadata webpMetadata = metadata.GetFormatMetadata(WebPFormat.Instance);
             this.metadata = new ImageMetadata();
+            this.webpMetadata = metadata.GetFormatMetadata(WebPFormat.Instance);
 
             WebPChunkType chunkType = this.ReadChunkType();
 
@@ -189,6 +193,8 @@ namespace SixLabors.ImageSharp.Formats.WebP
 
             if (isAnimationPresent)
             {
+                this.webpMetadata.Animated = true;
+
                 // ANIM chunk will be followed by n ANMF chunks
                 chunkType = this.ReadChunkType();
                 uint animationParameterChunkSize = this.ReadChunkSize();
@@ -230,6 +236,8 @@ namespace SixLabors.ImageSharp.Formats.WebP
 
         private WebPImageInfo ReadVp8Header()
         {
+            this.webpMetadata.Format = WebPFormatType.Lossy;
+
             // VP8 data size.
             this.currentStream.Read(this.buffer, 0, 3);
             this.buffer[3] = 0;
@@ -271,6 +279,8 @@ namespace SixLabors.ImageSharp.Formats.WebP
 
         private WebPImageInfo ReadVp8LHeader()
         {
+            this.webpMetadata.Format = WebPFormatType.Lossless;
+
             // VP8 data size.
             uint dataSize = this.ReadChunkSize();
 

src/ImageSharp/Formats/WebP/WebPFormatType.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Six Labors and contributors.
+// Licensed under the Apache License, Version 2.0.
+
+namespace SixLabors.ImageSharp.Formats.WebP
+{
+    /// <summary>
+    /// Info about the webp format used.
+    /// </summary>
+    public enum WebPFormatType
+    {
+        /// <summary>
+        /// Unknown webp format.
+        /// </summary>
+        Unknown,
+
+        /// <summary>
+        /// The lossless webp format.
+        /// </summary>
+        Lossless,
+
+        /// <summary>
+        /// The lossy webp format.
+        /// </summary>
+        Lossy,
+    }
+}

src/ImageSharp/Formats/WebP/WebPMetadata.cs

@@ -1,8 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using System;
-
 namespace SixLabors.ImageSharp.Formats.WebP
 {
     /// <summary>
@@ -10,7 +8,34 @@ namespace SixLabors.ImageSharp.Formats.WebP
     /// </summary>
     public class WebPMetadata : IDeepCloneable
     {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="WebPMetadata"/> class.
+        /// </summary>
+        public WebPMetadata()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="WebPMetadata"/> class.
+        /// </summary>
+        /// <param name="other">The metadata to create an instance from.</param>
+        private WebPMetadata(WebPMetadata other)
+        {
+            this.Animated = other.Animated;
+            this.Format = other.Format;
+        }
+
         /// <inheritdoc/>
-        public IDeepCloneable DeepClone() => throw new NotImplementedException();
+        public IDeepCloneable DeepClone() => new WebPMetadata(this);
+
+        /// <summary>
+        /// The webp format used. Either lossless or lossy.
+        /// </summary>
+        public WebPFormatType Format { get; set; }
+
+        /// <summary>
+        /// Indicates, if the webp file contains a animation.
+        /// </summary>
+        public bool Animated { get; set; } = false;
     }
 }