mirror of https://github.com/SixLabors/ImageSharp
JimBobSquarePants
13 years ago
4 changed files with 250 additions and 1 deletions
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// -----------------------------------------------------------------------
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// <copyright file="Saturate.cs" company="James South">
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// Copyright (c) James South.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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// -----------------------------------------------------------------------
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namespace ImageProcessor.Processors |
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{ |
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#region Using
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using System.Collections.Generic; |
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using System.Drawing; |
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using System.Drawing.Imaging; |
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using System.Text.RegularExpressions; |
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using ImageProcessor.Helpers.Extensions; |
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#endregion
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/// <summary>
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/// Encapsulates methods to change the saturation component of the image.
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/// </summary>
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/// <remarks>
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/// <see cref="http://www.bobpowell.net/imagesaturation.htm"/>
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/// </remarks>
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public class Saturate : IGraphicsProcessor |
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{ |
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/// <summary>
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/// The regular expression to search strings for.
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/// <see cref="http://stackoverflow.com/a/6400969/427899"/>
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/// </summary>
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private static readonly Regex QueryRegex = new Regex(@"saturate=(-|)(?:100|[1-9]?[0-9])", RegexOptions.Compiled); |
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#region IGraphicsProcessor Members
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/// <summary>
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/// Gets the name.
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/// </summary>
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public string Name |
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{ |
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get |
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{ |
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return "Saturate"; |
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} |
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} |
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/// <summary>
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/// Gets the description.
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/// </summary>
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public string Description |
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{ |
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get |
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{ |
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return "Changes the the saturation component of the image."; |
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} |
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} |
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/// <summary>
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/// Gets the regular expression to search strings for.
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/// </summary>
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public Regex RegexPattern |
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{ |
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get |
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{ |
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return QueryRegex; |
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} |
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} |
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/// <summary>
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/// Gets or sets DynamicParameter.
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/// </summary>
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public dynamic DynamicParameter |
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{ |
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get; |
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set; |
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} |
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/// <summary>
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/// Gets the order in which this processor is to be used in a chain.
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/// </summary>
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public int SortOrder |
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{ |
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get; |
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private set; |
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} |
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/// <summary>
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/// Gets or sets any additional settings required by the processor.
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/// </summary>
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public Dictionary<string, string> Settings |
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{ |
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get; |
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set; |
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} |
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/// <summary>
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/// The position in the original string where the first character of the captured substring was found.
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/// </summary>
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/// <param name="queryString">
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/// The query string to search.
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/// </param>
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/// <returns>
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/// The zero-based starting position in the original string where the captured substring was found.
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/// </returns>
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public int MatchRegexIndex(string queryString) |
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{ |
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int index = 0; |
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// Set the sort order to max to allow filtering.
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this.SortOrder = int.MaxValue; |
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foreach (Match match in this.RegexPattern.Matches(queryString)) |
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{ |
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if (match.Success) |
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{ |
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if (index == 0) |
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{ |
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// Set the index on the first instance only.
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this.SortOrder = match.Index; |
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int percentage = match.Value.ToIntegerArray()[0]; |
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this.DynamicParameter = percentage; |
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} |
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index += 1; |
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} |
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} |
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return this.SortOrder; |
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} |
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/// <summary>
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/// Processes the image.
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/// </summary>
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/// <param name="factory">
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/// The the current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class containing
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/// the image to process.
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/// </param>
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/// <returns>
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/// The processed image from the current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class.
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/// </returns>
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public Image ProcessImage(ImageFactory factory) |
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{ |
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Bitmap newImage = null; |
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Image image = factory.Image; |
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try |
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{ |
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float saturationFactor = (float)this.DynamicParameter / 100; |
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// Stop at -1 to prevent inversion.
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saturationFactor++; |
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// The matrix is set up to "shear" the colour space using the following set of values.
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// Note that each colour component has an effective luminance which contributes to the
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// overall brightness of the pixel.
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float saturationComplement = 1.0f - saturationFactor; |
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float saturationComplementR = 0.3086f * saturationComplement; |
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float saturationComplementG = 0.6094f * saturationComplement; |
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float saturationComplementB = 0.0820f * saturationComplement; |
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// Dont use an object initializer here.
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newImage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppPArgb); |
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newImage.Tag = image.Tag; |
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ColorMatrix colorMatrix = |
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new ColorMatrix( |
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new float[][] |
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{ |
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new float[] |
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{ |
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saturationComplementR + saturationFactor, saturationComplementR, |
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saturationComplementR, 0, 0 |
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}, |
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new float[] |
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{ |
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saturationComplementG, saturationComplementG + saturationFactor, |
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saturationComplementG, 0, 0 |
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}, |
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new float[] |
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{ |
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saturationComplementB, saturationComplementB, |
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saturationComplementB + saturationFactor, 0, 0 |
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}, |
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new float[] { 0, 0, 0, 1, 0 }, |
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new float[] { 0, 0, 0, 0, 1 } |
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}); |
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using (Graphics graphics = Graphics.FromImage(newImage)) |
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{ |
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using (ImageAttributes imageAttributes = new ImageAttributes()) |
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{ |
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imageAttributes.SetColorMatrix(colorMatrix); |
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graphics.DrawImage( |
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image, |
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new Rectangle(0, 0, image.Width, image.Height), |
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0, |
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0, |
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image.Width, |
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image.Height, |
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GraphicsUnit.Pixel, |
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imageAttributes); |
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image.Dispose(); |
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image = newImage; |
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} |
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} |
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} |
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catch |
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{ |
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if (newImage != null) |
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{ |
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newImage.Dispose(); |
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} |
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} |
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return image; |
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} |
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#endregion
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} |
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} |
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