finished untested packing algorithm for texture atlas as well as added some documentation.
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@ -11,69 +11,206 @@ using SixLabors.ImageSharp.PixelFormats;
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namespace RecrownedAthenaeum.ConsoleTools.TextureAtlasTools
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{
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internal class TexturePacker
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internal class TexturePacker : IDisposable
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{
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private enum SupportedExtensions
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{
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jpeg, jpg, png
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}
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int powLimit;
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Rectangle theoreticalSpace;
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Node masterNode;
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ImageHandler[] imageHandlers;
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Queue<ImageHandler> imageHandlerQueue;
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int textureLength;
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internal TexturePacker(string rootDirectoryPath)
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/// <summary>
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/// Machine to pack multiple textures into one large texture.
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/// </summary>
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/// <param name="rootDirectoryPath">Path to textures.</param>
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/// <param name="powLimit">Power of two limit for auto expanding texture. Default is 12 which is a 4096x4096 texture.</param>
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/// <param name="startingPower">What power to start at and build up from. Default is 8 which is a 256x256 texture.</param>
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internal TexturePacker(string rootDirectoryPath, int powLimit = 12, int startingPower = 8)
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{
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this.powLimit = powLimit;
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string[] paths = Directory.GetFiles(rootDirectoryPath);
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int minArea = 0;
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int currentPoTArea = 2 * 2;
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List<TheoreticalImage> theoreticalImages = new List<TheoreticalImage>();
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int currentPoT = startingPower;
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List<ImageHandler> imageHandlers = new List<ImageHandler>();
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for (int pathID = 0; pathID < paths.Length; pathID++)
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{
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SupportedExtensions extension;
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if (Enum.TryParse(Path.GetExtension(paths[pathID]), out extension))
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{
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using (FileStream stream = new FileStream(paths[pathID], FileMode.Open))
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{
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IImageInfo info = Image.Identify(stream);
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TheoreticalImage ti = new TheoreticalImage(info.Width, info.Height, paths[pathID]);
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theoreticalImages.Add(ti);
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minArea += ti.Area;
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while (currentPoTArea < minArea)
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{
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currentPoTArea *= 2 * 2;
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}
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}
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ImageHandler image = new ImageHandler(paths[pathID]);
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imageHandlers.Add(image);
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}
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}
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imageHandlers.Sort();
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this.imageHandlers = imageHandlers.ToArray();
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imageHandlerQueue = new Queue<ImageHandler>(imageHandlers);
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textureLength = currentPoT;
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}
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/// <summary>
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/// Builds a texture atlas.
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/// </summary>
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/// <param name="AutoCorrectAtlasSize">Whether or not to automatically upscale atlas' texture in the case it is too small. Goes up to 4096 by default.</param>
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public void Build(bool AutoCorrectAtlasSize = true)
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{
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masterNode = new Node();
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masterNode.region.Width = textureLength;
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masterNode.region.Height = textureLength;
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ImageHandler imageHandler;
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while (imageHandlerQueue.TryDequeue(out imageHandler))
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{
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try
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{
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masterNode.InsertImageHandler(imageHandler);
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}
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catch (InvalidOperationException)
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{
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textureLength *= 2;
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if (!AutoCorrectAtlasSize || textureLength > Math.Pow(2, powLimit))
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{
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throw new InvalidOperationException("Dimensions of texture goes past limit amount of " + powLimit + " which is " + Math.Pow(2, powLimit) + ". New texture size would be " + textureLength + "x" + textureLength + ".");
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}
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Build();
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}
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}
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}
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/// <summary>
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/// Renders the build into a PNG file and generates the respective <see cref="TextureAtlasData"/> meant for serialization and later to be loaded.
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/// </summary>
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public void Save()
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{
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}
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public void Dispose()
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{
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foreach (ImageHandler imageHandler in imageHandlers)
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{
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imageHandler.Dispose();
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}
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}
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private class Node
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{
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public Node parent;
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public Node[] branches = new Node[2];
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public readonly TheoreticalImage theoreticalImage;
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private Node a, b;
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public Node childA { get { if (a == null) a = new Node(this); return a; } set { value.parent = this; a = value; } }
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public Node childB { get { if (b == null) { b = new Node(this); } return b; } set { value.parent = this; b = value; } }
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public Rectangle region;
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public ImageHandler imageHandler;
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public bool Filled { get { return (imageHandler != null) || (a != null && b != null && a.Filled && b.Filled); } }
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public Node(TheoreticalImage theoreticalImage)
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public Node(Node parent = null)
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{
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this.theoreticalImage = theoreticalImage;
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this.parent = parent;
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region = parent.region;
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}
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public void SetNodeRegion(int x, int y, int width, int height, ImageHandler imageHandler)
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{
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region.X = x;
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region.Y = y;
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region.Width = width;
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region.Height = height;
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this.imageHandler = imageHandler;
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}
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public void SetNodeRegion(ImageHandler imageHandler)
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{
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SetNodeRegion(imageHandler.x, imageHandler.y, imageHandler.Width, imageHandler.Height, imageHandler);
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}
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public Node InsertImageHandler(ImageHandler imageHandler)
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{
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if (imageHandler.Width != region.Width)
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{
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if (imageHandler.Width < region.Width)
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{
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if (a == null)
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{
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childA.region.Width = imageHandler.Width;
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childB.region.Width = region.Width - childA.region.Width;
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}
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if (!childA.Filled && imageHandler.Width <= childA.region.Width)
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{
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return childA.InsertImageHandler(imageHandler);
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}
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if (!childB.Filled)
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{
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return childB.InsertImageHandler(imageHandler);
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}
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}
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}
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else if (imageHandler.Height != region.Height)
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{
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if (imageHandler.Height < region.Height)
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{
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if (a == null)
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{
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childA.region.Height = imageHandler.Height;
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childB.region.Height = region.Height - childA.region.Height;
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}
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if (!childA.Filled && imageHandler.Width <= childA.region.Width)
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{
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return childA.InsertImageHandler(imageHandler);
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}
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if (!childB.Filled)
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{
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return childB.InsertImageHandler(imageHandler);
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}
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}
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}
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else
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{
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imageHandler.x = region.X;
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imageHandler.y = region.Y;
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this.imageHandler = imageHandler;
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return this;
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}
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throw new ArgumentException();
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}
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}
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private struct TheoreticalImage
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private class ImageHandler : IComparable<ImageHandler>, IDisposable
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{
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public Rectangle bounds;
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public readonly string path;
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public int Area { get { return bounds.Width * bounds.Height; } }
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public readonly Image<Rgba32> image;
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public int Area { get { return image.Width * image.Height; } }
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public string Name { get { return Path.GetFileName(path); } }
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public int Width { get { return image.Width; } }
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public int Height { get { return image.Height; } }
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public int x, y;
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public TheoreticalImage(int width, int height, string path)
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internal ImageHandler(String path)
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{
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bounds = new Rectangle();
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bounds.Width = width;
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bounds.Height = height;
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this.path = path;
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using (FileStream stream = new FileStream(path, FileMode.Open))
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{
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image = Image.Load(stream);
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}
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}
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public int CompareTo(ImageHandler tImage)
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{
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return Area - tImage.Area;
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}
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public void Dispose()
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{
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image.Dispose();
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}
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}
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}
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