Processed review comments, removed IImageFrameCollection interface, and added backgroundColor parameter to ImageFrameCollection.CreateFrame() method with default.

src/ImageSharp/IImageFrameCollection.cs

@@ -1,115 +0,0 @@
-// Copyright (c) Six Labors and contributors.
-// Licensed under the Apache License, Version 2.0.
-
-using System;
-using System.Collections.Generic;
-
-using SixLabors.ImageSharp.PixelFormats;
-
-namespace SixLabors.ImageSharp
-{
-    /// <summary>
-    /// Encapsulates a collection of <see cref="ImageFrame{T}"/> instances that make up an <see cref="Image{T}"/>.
-    /// </summary>
-    /// <typeparam name="TPixel">The type of the pixel.</typeparam>
-    public interface IImageFrameCollection<TPixel> : IEnumerable<ImageFrame<TPixel>>
-        where TPixel : struct, IPixel<TPixel>
-    {
-        /// <summary>
-        /// Gets the number of frames.
-        /// </summary>
-        int Count { get; }
-
-        /// <summary>
-        /// Gets the root frame.
-        /// </summary>
-        ImageFrame<TPixel> RootFrame { get; }
-
-        /// <summary>
-        /// Gets the <see cref="ImageFrame{TPixel}"/> at the specified index.
-        /// </summary>
-        /// <value>
-        /// The <see cref="ImageFrame{TPixel}"/>.
-        /// </value>
-        /// <param name="index">The index.</param>
-        /// <returns>The <see cref="ImageFrame{TPixel}"/> at the specified index.</returns>
-        ImageFrame<TPixel> this[int index] { get; }
-
-        /// <summary>
-        /// Creates an <see cref="Image{T}"/> with only the frame at the specified index
-        /// with the same metadata as the original image.
-        /// </summary>
-        /// <param name="index">The zero-based index of the frame to clone.</param>
-        /// <returns>The new <see cref="Image{TPixel}"/> with the specified frame.</returns>
-        Image<TPixel> CloneFrame(int index);
-
-        /// <summary>
-        /// Removes the frame at the specified index and creates a new image with only the removed frame
-        /// with the same metadata as the original image.
-        /// </summary>
-        /// <param name="index">The zero-based index of the frame to export.</param>
-        /// <exception cref="InvalidOperationException">Cannot remove last frame.</exception>
-        /// <returns>The new <see cref="Image{TPixel}"/> with the specified frame.</returns>
-        Image<TPixel> ExportFrame(int index);
-
-        /// <summary>
-        /// Removes the frame at the specified index and frees all freeable resources associated with it.
-        /// </summary>
-        /// <param name="index">The zero-based index of the frame to remove.</param>
-        /// <exception cref="InvalidOperationException">Cannot remove last frame.</exception>
-        void RemoveFrame(int index);
-
-        /// <summary>
-        /// Creates a new <seealso cref="ImageFrame{TPixel}"/> and appends it to the end of the collection.
-        /// </summary>
-        /// <returns>The new <see cref="ImageFrame{TPixel}"/>.</returns>
-        ImageFrame<TPixel> CreateFrame();
-
-        /// <summary>
-        /// Clones the <paramref name="source"/> frame and appends the clone to the end of the collection.
-        /// </summary>
-        /// <param name="source">The raw pixel data to generate the <seealso cref="ImageFrame{TPixel}"/> from.</param>
-        /// <returns>The cloned <see cref="ImageFrame{TPixel}"/>.</returns>
-        ImageFrame<TPixel> AddFrame(ImageFrame<TPixel> source);
-
-        /// <summary>
-        /// Creates a new frame from the pixel data with the same dimensions as the other frames and inserts the
-        /// new frame at the end of the collection.
-        /// </summary>
-        /// <param name="source">The raw pixel data to generate the <seealso cref="ImageFrame{TPixel}"/> from.</param>
-        /// <returns>The new <see cref="ImageFrame{TPixel}"/>.</returns>
-        ImageFrame<TPixel> AddFrame(TPixel[] source);
-
-        /// <summary>
-        /// Clones and inserts the <paramref name="source"/> into the <seealso cref="IImageFrameCollection{TPixel}"/> at the specified <paramref name="index"/>.
-        /// </summary>
-        /// <param name="index">The zero-based index to insert the frame at.</param>
-        /// <param name="source">The <seealso cref="ImageFrame{TPixel}"/> to clone and insert into the <seealso cref="IImageFrameCollection{TPixel}"/>.</param>
-        /// <exception cref="ArgumentException">Frame must have the same dimensions as the image.</exception>
-        /// <returns>The cloned <see cref="ImageFrame{TPixel}"/>.</returns>
-        ImageFrame<TPixel> InsertFrame(int index, ImageFrame<TPixel> source);
-
-        /// <summary>
-        /// Moves an <seealso cref="ImageFrame{TPixel}"/> from <paramref name="sourceIndex"/> to <paramref name="destinationIndex"/>.
-        /// </summary>
-        /// <param name="sourceIndex">The zero-based index of the frame to move.</param>
-        /// <param name="destinationIndex">The index to move the frame to.</param>
-        void MoveFrame(int sourceIndex, int destinationIndex);
-
-        /// <summary>
-        /// Determines the index of a specific <paramref name="frame"/> in the <seealso cref="IImageFrameCollection{TPixel}"/>.
-        /// </summary>
-        /// <param name="frame">The <seealso cref="ImageFrame{TPixel}"/> to locate in the <seealso cref="IImageFrameCollection{TPixel}"/>.</param>
-        /// <returns>The index of item if found in the list; otherwise, -1.</returns>
-        int IndexOf(ImageFrame<TPixel> frame);
-
-        /// <summary>
-        /// Determines whether the <seealso cref="IImageFrameCollection{TPixel}"/> contains the <paramref name="frame"/>.
-        /// </summary>
-        /// <param name="frame">The frame.</param>
-        /// <returns>
-        ///   <c>true</c> if the <seealso cref="IImageFrameCollection{TPixel}"/> contains the specified frame; otherwise, <c>false</c>.
-        /// </returns>
-        bool Contains(ImageFrame<TPixel> frame);
-    }
-}

src/ImageSharp/ImageFrameCollection.cs

@@ -9,8 +9,11 @@ using SixLabors.ImageSharp.PixelFormats;
 
 namespace SixLabors.ImageSharp
 {
-    /// <inheritdoc/>
-    internal sealed class ImageFrameCollection<TPixel> : IImageFrameCollection<TPixel>
+    /// <summary>
+    /// Encapsulates a collection of <see cref="ImageFrame{T}"/> instances that make up an <see cref="Image{T}"/>.
+    /// </summary>
+    /// <typeparam name="TPixel">The type of the pixel.</typeparam>
+    public sealed class ImageFrameCollection<TPixel> : IEnumerable<ImageFrame<TPixel>>
         where TPixel : struct, IPixel<TPixel>
     {
         private readonly IList<ImageFrame<TPixel>> frames = new List<ImageFrame<TPixel>>();
@@ -41,51 +44,85 @@ namespace SixLabors.ImageSharp
             }
         }
 
-        /// <inheritdoc/>
+        /// <summary>
+        /// Gets the number of frames.
+        /// </summary>
         public int Count => this.frames.Count;
 
-        /// <inheritdoc/>
+        /// <summary>
+        /// Gets the root frame.
+        /// </summary>
         public ImageFrame<TPixel> RootFrame => this.frames.Count > 0 ? this.frames[0] : null;
 
-        /// <inheritdoc/>
+        /// <summary>
+        /// Gets the <see cref="ImageFrame{TPixel}"/> at the specified index.
+        /// </summary>
+        /// <value>
+        /// The <see cref="ImageFrame{TPixel}"/>.
+        /// </value>
+        /// <param name="index">The index.</param>
+        /// <returns>The <see cref="ImageFrame{TPixel}"/> at the specified index.</returns>
         public ImageFrame<TPixel> this[int index] => this.frames[index];
 
-        /// <inheritdoc/>
+        /// <summary>
+        /// Determines the index of a specific <paramref name="frame"/> in the <seealso cref="ImageFrameCollection{TPixel}"/>.
+        /// </summary>
+        /// <param name="frame">The <seealso cref="ImageFrame{TPixel}"/> to locate in the <seealso cref="ImageFrameCollection{TPixel}"/>.</param>
+        /// <returns>The index of item if found in the list; otherwise, -1.</returns>
         public int IndexOf(ImageFrame<TPixel> frame) => this.frames.IndexOf(frame);
 
-        /// <inheritdoc/>
-        public ImageFrame<TPixel> InsertFrame(int index, ImageFrame<TPixel> frame)
+        /// <summary>
+        /// Clones and inserts the <paramref name="source"/> into the <seealso cref="ImageFrameCollection{TPixel}"/> at the specified <paramref name="index"/>.
+        /// </summary>
+        /// <param name="index">The zero-based index to insert the frame at.</param>
+        /// <param name="source">The <seealso cref="ImageFrame{TPixel}"/> to clone and insert into the <seealso cref="ImageFrameCollection{TPixel}"/>.</param>
+        /// <exception cref="ArgumentException">Frame must have the same dimensions as the image.</exception>
+        /// <returns>The cloned <see cref="ImageFrame{TPixel}"/>.</returns>
+        public ImageFrame<TPixel> InsertFrame(int index, ImageFrame<TPixel> source)
         {
-            this.ValidateFrame(frame);
-            ImageFrame<TPixel> clonedFrame = frame.Clone();
+            this.ValidateFrame(source);
+            ImageFrame<TPixel> clonedFrame = source.Clone();
             this.frames.Insert(index, clonedFrame);
             return clonedFrame;
         }
 
-        /// <inheritdoc/>
-        public ImageFrame<TPixel> AddFrame(ImageFrame<TPixel> frame)
+        /// <summary>
+        /// Clones the <paramref name="source"/> frame and appends the clone to the end of the collection.
+        /// </summary>
+        /// <param name="source">The raw pixel data to generate the <seealso cref="ImageFrame{TPixel}"/> from.</param>
+        /// <returns>The cloned <see cref="ImageFrame{TPixel}"/>.</returns>
+        public ImageFrame<TPixel> AddFrame(ImageFrame<TPixel> source)
         {
-            this.ValidateFrame(frame);
-            ImageFrame<TPixel> clonedFrame = frame.Clone();
+            this.ValidateFrame(source);
+            ImageFrame<TPixel> clonedFrame = source.Clone();
             this.frames.Add(clonedFrame);
             return clonedFrame;
         }
 
-        /// <inheritdoc/>
-        public ImageFrame<TPixel> AddFrame(TPixel[] data)
+        /// <summary>
+        /// Creates a new frame from the pixel data with the same dimensions as the other frames and inserts the
+        /// new frame at the end of the collection.
+        /// </summary>
+        /// <param name="source">The raw pixel data to generate the <seealso cref="ImageFrame{TPixel}"/> from.</param>
+        /// <returns>The new <see cref="ImageFrame{TPixel}"/>.</returns>
+        public ImageFrame<TPixel> AddFrame(TPixel[] source)
         {
-            Guard.NotNull(data, nameof(data));
+            Guard.NotNull(source, nameof(source));
 
             var frame = ImageFrame.LoadPixelData(
                 this.parent.GetMemoryManager(),
-                new Span<TPixel>(data),
+                new Span<TPixel>(source),
                 this.RootFrame.Width,
                 this.RootFrame.Height);
             this.frames.Add(frame);
             return frame;
         }
 
-        /// <inheritdoc/>
+        /// <summary>
+        /// Removes the frame at the specified index and frees all freeable resources associated with it.
+        /// </summary>
+        /// <param name="index">The zero-based index of the frame to remove.</param>
+        /// <exception cref="InvalidOperationException">Cannot remove last frame.</exception>
         public void RemoveFrame(int index)
         {
             if (index == 0 && this.Count == 1)
@@ -98,26 +135,42 @@ namespace SixLabors.ImageSharp
             frame.Dispose();
         }
 
-        /// <inheritdoc/>
+        /// <summary>
+        /// Determines whether the <seealso cref="ImageFrameCollection{TPixel}"/> contains the <paramref name="frame"/>.
+        /// </summary>
+        /// <param name="frame">The frame.</param>
+        /// <returns>
+        ///   <c>true</c> if the <seealso cref="ImageFrameCollection{TPixel}"/> contains the specified frame; otherwise, <c>false</c>.
+        /// </returns>
         public bool Contains(ImageFrame<TPixel> frame)
         {
             return this.frames.Contains(frame);
         }
 
-        /// <inheritdoc/>
-        public void MoveFrame(int sourceIndex, int destIndex)
+        /// <summary>
+        /// Moves an <seealso cref="ImageFrame{TPixel}"/> from <paramref name="sourceIndex"/> to <paramref name="destinationIndex"/>.
+        /// </summary>
+        /// <param name="sourceIndex">The zero-based index of the frame to move.</param>
+        /// <param name="destinationIndex">The index to move the frame to.</param>
+        public void MoveFrame(int sourceIndex, int destinationIndex)
         {
-            if (sourceIndex == destIndex)
+            if (sourceIndex == destinationIndex)
             {
                 return;
             }
 
             ImageFrame<TPixel> frameAtIndex = this.frames[sourceIndex];
             this.frames.RemoveAt(sourceIndex);
-            this.frames.Insert(destIndex, frameAtIndex);
+            this.frames.Insert(destinationIndex, frameAtIndex);
         }
 
-        /// <inheritdoc/>
+        /// <summary>
+        /// Removes the frame at the specified index and creates a new image with only the removed frame
+        /// with the same metadata as the original image.
+        /// </summary>
+        /// <param name="index">The zero-based index of the frame to export.</param>
+        /// <exception cref="InvalidOperationException">Cannot remove last frame.</exception>
+        /// <returns>The new <see cref="Image{TPixel}"/> with the specified frame.</returns>
         public Image<TPixel> ExportFrame(int index)
         {
             ImageFrame<TPixel> frame = this[index];
@@ -132,7 +185,12 @@ namespace SixLabors.ImageSharp
             return new Image<TPixel>(this.parent.GetConfiguration(), this.parent.MetaData.Clone(), new[] { frame });
         }
 
-        /// <inheritdoc/>
+        /// <summary>
+        /// Creates an <see cref="Image{T}"/> with only the frame at the specified index
+        /// with the same metadata as the original image.
+        /// </summary>
+        /// <param name="index">The zero-based index of the frame to clone.</param>
+        /// <returns>The new <see cref="Image{TPixel}"/> with the specified frame.</returns>
         public Image<TPixel> CloneFrame(int index)
         {
             ImageFrame<TPixel> frame = this[index];
@@ -140,10 +198,15 @@ namespace SixLabors.ImageSharp
             return new Image<TPixel>(this.parent.GetConfiguration(), this.parent.MetaData.Clone(), new[] { clonedFrame });
         }
 
-        /// <inheritdoc/>
-        public ImageFrame<TPixel> CreateFrame()
-        {
-            var frame = new ImageFrame<TPixel>(this.parent.GetConfiguration(), this.RootFrame.Width, this.RootFrame.Height, default);
+        /// <summary>
+        /// Creates a new <seealso cref="ImageFrame{TPixel}" /> and appends it to the end of the collection.
+        /// </summary>
+        /// <param name="backgroundColor">The background color to initialize the pixels with.</param>
+        /// <returns>
+        /// The new <see cref="ImageFrame{TPixel}" />.
+        /// </returns>
+        public ImageFrame<TPixel> CreateFrame(TPixel backgroundColor = default) {
+            var frame = new ImageFrame<TPixel>(this.parent.GetConfiguration(), this.RootFrame.Width, this.RootFrame.Height, backgroundColor);
             this.frames.Add(frame);
             return frame;
         }

src/ImageSharp/Image{TPixel}.cs

@@ -135,7 +135,7 @@ namespace SixLabors.ImageSharp
         /// <summary>
         /// Gets the frames.
         /// </summary>
-        public IImageFrameCollection<TPixel> Frames => this.frames;
+        public ImageFrameCollection<TPixel> Frames => this.frames;
 
         /// <summary>
         /// Gets the root frame.