Remove Parent property

src/ImageSharp/Image/IImageFrame.cs

@@ -16,11 +16,6 @@ namespace SixLabors.ImageSharp
     internal interface IImageFrame<TPixel> : IImageFrame
         where TPixel : struct, IPixel<TPixel>
     {
-        /// <summary>
-        /// Gets the parent.
-        /// </summary>
-        Image<TPixel> Parent { get; }
-
         /// <summary>
         /// Gets the pixel buffer.
         /// </summary>

src/ImageSharp/Image/ImageFrameCollection.cs

@@ -4,16 +4,8 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Diagnostics;
-using System.IO;
-using System.Numerics;
-using System.Text;
-using System.Threading.Tasks;
-using SixLabors.ImageSharp.Formats;
-using SixLabors.ImageSharp.MetaData;
+
 using SixLabors.ImageSharp.PixelFormats;
-using SixLabors.ImageSharp.Processing;
-using SixLabors.Primitives;
 
 namespace SixLabors.ImageSharp
 {
@@ -24,34 +16,25 @@ namespace SixLabors.ImageSharp
     public sealed class ImageFrameCollection<TPixel> : IEnumerable<ImageFrame<TPixel>>
         where TPixel : struct, IPixel<TPixel>
     {
-        private IList<ImageFrame<TPixel>> frames = new List<ImageFrame<TPixel>>();
-        private readonly Image<TPixel> parent;
+        private readonly IList<ImageFrame<TPixel>> frames = new List<ImageFrame<TPixel>>();
+        private readonly int parentWidth;
+        private readonly int parentHeight;
 
         internal ImageFrameCollection(Image<TPixel> parent)
         {
-            this.parent = parent;
+            this.parentWidth = parent.Width;
+            this.parentHeight = parent.Height;
         }
 
         /// <summary>
         /// Gets the count.
         /// </summary>
-        public int Count { get => this.frames.Count; }
+        public int Count => this.frames.Count;
 
         /// <summary>
         /// Gets the root frame.
         /// </summary>
-        public ImageFrame<TPixel> RootFrame
-        {
-            get
-            {
-                if (this.frames.Count > 0)
-                {
-                    return this.frames[0];
-                }
-
-                return null;
-            }
-        }
+        public ImageFrame<TPixel> RootFrame => this.frames.Count > 0 ? this.frames[0] : null;
 
         /// <summary>
         /// Gets or sets the <see cref="ImageFrame{TPixel}"/> at the specified index.
@@ -63,10 +46,7 @@ namespace SixLabors.ImageSharp
         /// <returns>The <see cref="ImageFrame{TPixel}"/> at the specified index.</returns>
         public ImageFrame<TPixel> this[int index]
         {
-            get
-            {
-                return this.frames[index];
-            }
+            get => this.frames[index];
 
             set
             {
@@ -123,7 +103,7 @@ namespace SixLabors.ImageSharp
         {
             if (this.Count != 0)
             {
-                if (this.parent.Width != frame.Width || this.parent.Height != frame.Height)
+                if (this.parentWidth != frame.Width || this.parentHeight != frame.Height)
                 {
                     throw new ArgumentException("Frame must have the same dimensions as the image", nameof(frame));
                 }

src/ImageSharp/Image/Image{TPixel}.cs

@@ -136,9 +136,6 @@ namespace SixLabors.ImageSharp
         /// <inheritdoc/>
         ImageFrameMetaData IImageFrame.MetaData => this.RootFrame.MetaData;
 
-        /// <inheritdoc/>
-        Image<TPixel> IImageFrame<TPixel>.Parent => this.RootFrame.Parent;
-
         /// <summary>
         /// Gets or sets the pixel at the specified position.
         /// </summary>

src/ImageSharp/Image/PixelAccessor{TPixel}.cs

@@ -4,8 +4,7 @@
 using System;
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
-using System.Threading.Tasks;
-using SixLabors.ImageSharp.Advanced;
+
 using SixLabors.ImageSharp.Memory;
 using SixLabors.ImageSharp.PixelFormats;
 using Unsafe = System.Runtime.CompilerServices.Unsafe;
@@ -49,8 +48,6 @@ namespace SixLabors.ImageSharp
             Guard.MustBeGreaterThan(image.Height, 0, "image height");
 
             this.SetPixelBufferUnsafe(image.PixelBuffer, false);
-            Configuration config = image.Parent.Configuration();
-            this.ParallelOptions = config.ParallelOptions;
         }
 
         /// <summary>
@@ -77,8 +74,6 @@ namespace SixLabors.ImageSharp
             Guard.MustBeGreaterThan(height, 0, nameof(height));
 
             this.SetPixelBufferUnsafe(pixels, ownedBuffer);
-
-            this.ParallelOptions = Configuration.Default.ParallelOptions;
         }
 
         /// <summary>
@@ -104,21 +99,12 @@ namespace SixLabors.ImageSharp
         /// </summary>
         public int RowStride { get; private set; }
 
-        /// <summary>
-        /// Gets the width of the image.
-        /// </summary>
+        /// <inheritdoc />
         public int Width { get; private set; }
 
-        /// <summary>
-        /// Gets the height of the image.
-        /// </summary>
+        /// <inheritdoc />
         public int Height { get; private set; }
 
-        /// <summary>
-        /// Gets the global parallel options for processing tasks in parallel.
-        /// </summary>
-        public ParallelOptions ParallelOptions { get; }
-
         /// <inheritdoc />
         Span<TPixel> IBuffer2D<TPixel>.Span => this.PixelBuffer;
 
@@ -147,9 +133,7 @@ namespace SixLabors.ImageSharp
             }
         }
 
-        /// <summary>
-        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
-        /// </summary>
+        /// <inheritdoc />
         public void Dispose()
         {
             if (this.isDisposed || !this.ownedBuffer)
@@ -245,7 +229,7 @@ namespace SixLabors.ImageSharp
         /// <remarks>If <see cref="M:PixelAccessor.PooledMemory"/> is true then caller is responsible for ensuring <see cref="M:PixelDataPool.Return()"/> is called.</remarks>
         internal Buffer2D<TPixel> SwapBufferOwnership(Buffer2D<TPixel> pixels)
         {
-            var oldPixels = this.PixelBuffer;
+            Buffer2D<TPixel> oldPixels = this.PixelBuffer;
             this.SetPixelBufferUnsafe(pixels, this.ownedBuffer);
             return oldPixels;
         }