mirror of https://github.com/SixLabors/ImageSharp
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Former-commit-id: 5282fe802e662491408ae81b4690a82e78a250e7 Former-commit-id: 9073787f97a927614ab35ba9a402e421e5f0b8b2af/merge-core
James South
12 years ago
10 changed files with 199 additions and 23 deletions
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// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="Pixelate.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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// <summary>
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// Encapsulates methods to pixelate an image.
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// </summary>
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// --------------------------------------------------------------------------------------------------------------------
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namespace ImageProcessor.Web.Processors |
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{ |
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using System; |
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using System.Drawing; |
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using System.Globalization; |
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using System.Text; |
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using System.Text.RegularExpressions; |
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using ImageProcessor.Processors; |
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using ImageProcessor.Web.Extensions; |
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/// <summary>
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/// Encapsulates methods to pixelate an image.
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/// </summary>
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public class Pixelate : IWebGraphicsProcessor |
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{ |
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/// <summary>
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/// The regular expression to search strings for.
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/// </summary>
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private static readonly Regex QueryRegex = new Regex(@"(pixelate=|pixelrect=)[^&]+", RegexOptions.Compiled); |
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/// <summary>
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/// The pixel regex.
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/// </summary>
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private static readonly Regex PixelRegex = new Regex(@"pixelate=\d+", RegexOptions.Compiled); |
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/// <summary>
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/// The rectangle regex.
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/// </summary>
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private static readonly Regex RectangleRegex = new Regex(@"pixelrect=\d+,\d+,\d+,\d+", RegexOptions.Compiled); |
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/// <summary>
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/// Initializes a new instance of the <see cref="Pixelate"/> class.
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/// </summary>
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public Pixelate() |
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{ |
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this.Processor = new ImageProcessor.Processors.Pixelate(); |
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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 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 { get; private set; } |
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/// <summary>
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/// Gets the associated graphics processor.
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/// </summary>
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public IGraphicsProcessor Processor { get; private set; } |
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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">The query string to search.</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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// First merge the matches so we can parse .
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StringBuilder stringBuilder = new StringBuilder(); |
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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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} |
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stringBuilder.Append(match.Value); |
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index += 1; |
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} |
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} |
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if (this.SortOrder < int.MaxValue) |
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{ |
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// Match syntax
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string toParse = stringBuilder.ToString(); |
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int size = this.ParseSize(toParse); |
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Rectangle? rectangle = this.ParseRectangle(toParse); |
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this.Processor.DynamicParameter = new Tuple<int, Rectangle?>(size, rectangle); |
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} |
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return this.SortOrder; |
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} |
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/// <summary>
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/// Returns the correct size of pixels.
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/// </summary>
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/// <param name="input">
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/// The input containing the value to parse.
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/// </param>
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/// <returns>
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/// The <see cref="int"/> representing the pixel size.
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/// </returns>
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public int ParseSize(string input) |
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{ |
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int size = 0; |
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foreach (Match match in PixelRegex.Matches(input)) |
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{ |
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size = int.Parse(match.Value.Split('=')[1], CultureInfo.InvariantCulture); |
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} |
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return size; |
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} |
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/// <summary>
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/// Returns the correct <see cref="Nullable{Rectange}"/> for the given string.
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/// </summary>
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/// <param name="input">
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/// The input string containing the value to parse.
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/// </param>
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/// <returns>
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/// The correct <see cref="Nullable{Rectange}"/>
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/// </returns>
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private Rectangle? ParseRectangle(string input) |
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{ |
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int[] dimensions = { }; |
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foreach (Match match in RectangleRegex.Matches(input)) |
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{ |
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dimensions = match.Value.ToPositiveIntegerArray(); |
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} |
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if (dimensions.Length == 4) |
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{ |
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return new Rectangle(dimensions[0], dimensions[1], dimensions[2], dimensions[3]); |
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} |
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return null; |
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} |
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} |
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} |
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