Adding pixelate processor

Former-commit-id: 89965b4a0b6f41159b90655139045dd2bcfcea44

src/ImageProcessor/ImageFactory.cs

@@ -650,6 +650,28 @@ namespace ImageProcessor
             return this;
         }
 
+        /// <summary>
+        /// Pixelates an image with the given size.
+        /// </summary>
+        /// <param name="pixelSize">
+        /// The size of the pixels to create.</param>
+        /// <param name="rectangle">
+        /// The area in which to pixelate the image. If not set, the whole image is pixelated.
+        /// </param>
+        /// <returns>
+        /// The current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class.
+        /// </returns>
+        public ImageFactory Pixelate(int pixelSize, Rectangle? rectangle = null)
+        {
+            if (this.ShouldProcess && pixelSize > 0)
+            {
+                Pixelate pixelate = new Pixelate { DynamicParameter = new Tuple<int, Rectangle?>(pixelSize, rectangle) };
+                this.CurrentImageFormat.ApplyProcessor(pixelate.ProcessImage, this);
+            }
+
+            return this;
+        }
+
         /// <summary>
         /// Alters the output quality of the current image.
         /// <remarks>

src/ImageProcessor/ImageProcessor.csproj

@@ -125,6 +125,7 @@
     <Compile Include="Processors\HueRotate.cs" />
     <Compile Include="Processors\Hue.cs" />
     <Compile Include="Processors\Meta.cs" />
+    <Compile Include="Processors\Pixelate.cs" />
     <Compile Include="Processors\RoundedCorners.cs" />
     <Compile Include="Processors\Saturation.cs" />
     <Compile Include="Processors\Flip.cs" />

src/ImageProcessor/Processors/Pixelate.cs

@@ -0,0 +1,134 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="Pixelate.cs" company="James South">
+//   Copyright (c) James South.
+//   Licensed under the Apache License, Version 2.0.
+// </copyright>
+// <summary>
+//   Encapsulates methods to pixelate an image.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace ImageProcessor.Processors
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Drawing;
+
+    using ImageProcessor.Common.Exceptions;
+    using ImageProcessor.Imaging;
+
+    /// <summary>
+    /// Encapsulates methods to pixelate an image.
+    /// </summary>
+    public class Pixelate : IGraphicsProcessor
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Pixelate"/> class.
+        /// </summary>
+        public Pixelate()
+        {
+            this.Settings = new Dictionary<string, string>();
+        }
+
+        /// <summary>
+        /// Gets or sets the dynamic parameter.
+        /// </summary>
+        public dynamic DynamicParameter
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets any additional settings required by the processor.
+        /// </summary>
+        public Dictionary<string, string> Settings
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Processes the image.
+        /// </summary>
+        /// <param name="factory">
+        /// The current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class containing
+        /// the image to process.
+        /// </param>
+        /// <returns>
+        /// The processed image from the current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class.
+        /// </returns>
+        public Image ProcessImage(ImageFactory factory)
+        {
+            Bitmap newImage = null;
+            Image image = factory.Image;
+
+            try
+            {
+                Tuple<int, Rectangle?> parameters = this.DynamicParameter;
+                int size = parameters.Item1;
+                Rectangle rectangle = parameters.Item2.HasValue
+                                      ? parameters.Item2.Value
+                                      : new Rectangle(0, 0, image.Width, image.Height);
+                int x = rectangle.X;
+                int y = rectangle.Y;
+                int offset = size / 2;
+                int width = rectangle.Width;
+                int height = rectangle.Height;
+                int maxWidth = image.Width;
+                int maxHeight = image.Height;
+
+                newImage = new Bitmap(image);
+
+                using (FastBitmap fastBitmap = new FastBitmap(newImage))
+                {
+                    for (int i = x; i < x + width && i < maxWidth; i += size)
+                    {
+                        for (int j = y; j < y + height && j < maxHeight; j += size)
+                        {
+                            int offsetX = offset;
+                            int offsetY = offset;
+
+                            // Make sure that the offset is within the boundary of the image.
+                            while (i + offsetX >= maxWidth)
+                            {
+                                offsetX--;
+                            }
+
+                            while (j + offsetY >= maxHeight)
+                            {
+                                offsetY--;
+                            }
+
+                            // Get the pixel color in the centre of the soon to be pixelated area.
+                            Color pixel = fastBitmap.GetPixel(i + offsetX, j + offsetY);
+
+                            // For each pixel in the pixelate size, set it to the centre color.
+                            for (int k = i; k < i + size && k < maxWidth; k++)
+                            {
+                                for (int l = j; l < j + size && l < maxHeight; l++)
+                                {
+                                    fastBitmap.SetPixel(k, l, pixel);
+                                }
+                            }
+                        }
+                    }
+                }
+
+                image.Dispose();
+                image = newImage;
+            }
+            catch (Exception ex)
+            {
+                if (newImage != null)
+                {
+                    newImage.Dispose();
+                }
+
+                throw new ImageProcessingException("Error processing image with " + this.GetType().Name, ex);
+            }
+
+            return image;
+        }
+    }
+}

src/ImageProcessorConsole/Program.cs

@@ -18,6 +18,7 @@ namespace ImageProcessorConsole
     using System.Linq;
     using ImageProcessor;
     using ImageProcessor.Imaging;
+    using ImageProcessor.Imaging.Filters;
     using ImageProcessor.Plugins.Cair;
     using ImageProcessor.Plugins.Cair.Imaging;
 
@@ -60,7 +61,7 @@ namespace ImageProcessorConsole
                 {
                     using (ImageFactory imageFactory = new ImageFactory(true))
                     {
-                        Size size = new Size(448, 0);
+                        Size size = new Size(800, 0);
 
                         //ContentAwareResizeLayer layer = new ContentAwareResizeLayer(size)
                         //{
@@ -72,9 +73,9 @@ namespace ImageProcessorConsole
                             //.BackgroundColor(Color.White)
                             //.Resize(new Size((int)(size.Width * 1.1), 0))
                             //.ContentAwareResize(layer)
-                            .Constrain(size)
-                            .Hue(180)
-                            .Quality(100)
+                            //.Constrain(size)
+                            //.Filter(MatrixFilters.HiSatch)
+                            .Pixelate(8)
                             .Save(Path.GetFullPath(Path.Combine(Path.GetDirectoryName(path), @"..\..\images\output", fileInfo.Name)));
 
                         stopwatch.Stop();