mirror of https://github.com/SixLabors/ImageSharp
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Original method was too processor intensive Former-commit-id: c4e96a8657da8e48267667a9c790b7730d3434efpull/17/head
James South
12 years ago
5 changed files with 175 additions and 192 deletions
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// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="Filter.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 with which to add filters to 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.Collections.Generic; |
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using System.Linq; |
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using System.Reflection; |
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using System.Text; |
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using System.Text.RegularExpressions; |
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using ImageProcessor.Imaging.Filters; |
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using ImageProcessor.Processors; |
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/// <summary>
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/// Encapsulates methods with which to add filters to an image.
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/// </summary>
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public class Filter : 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 = BuildRegex(); |
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/// <summary>
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/// Initializes a new instance of the <see cref="Filter"/> class.
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/// </summary>
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public Filter() |
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{ |
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this.Processor = new ImageProcessor.Processors.Filter(); |
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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 |
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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 the processor.
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/// </summary>
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/// <value>
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/// The processor.
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/// </value>
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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">
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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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this.Processor.DynamicParameter = this.ParseFilter(match.Value.Split('=')[1]); |
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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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/// Builds a regular expression from the <see cref="MatrixFilters"/> type, this allows extensibility.
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/// </summary>
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/// <returns>
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/// The <see cref="Regex"/> to match matrix filters.
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/// </returns>
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private static Regex BuildRegex() |
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{ |
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const BindingFlags Flags = BindingFlags.Public | BindingFlags.Static; |
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Type type = typeof(MatrixFilters); |
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IEnumerable<PropertyInfo> filters = type.GetProperties(Flags) |
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.Where(p => p.PropertyType.IsAssignableFrom(typeof(IMatrixFilter))) |
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.ToList(); |
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StringBuilder stringBuilder = new StringBuilder(); |
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stringBuilder.Append("filter=("); |
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int counter = 0; |
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foreach (PropertyInfo filter in filters) |
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{ |
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if (counter == 0) |
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{ |
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stringBuilder.Append(filter.Name.ToLowerInvariant()); |
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} |
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else |
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{ |
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stringBuilder.AppendFormat("|{0}", filter.Name.ToLowerInvariant()); |
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} |
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counter++; |
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} |
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stringBuilder.Append(")"); |
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return new Regex(stringBuilder.ToString(), RegexOptions.IgnoreCase | RegexOptions.Compiled); |
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} |
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/// <summary>
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/// Parses the filter.
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/// </summary>
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/// <param name="identifier">
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/// The identifier.
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/// </param>
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/// <returns>
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/// The <see cref="IMatrixFilter"/>.
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/// </returns>
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private IMatrixFilter ParseFilter(string identifier) |
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{ |
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const BindingFlags Flags = BindingFlags.Public | BindingFlags.Static; |
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Type type = typeof(MatrixFilters); |
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PropertyInfo filter = |
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type.GetProperties(Flags) |
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.Where(p => p.PropertyType.IsAssignableFrom(typeof(IMatrixFilter))) |
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.First(p => p.Name.Equals(identifier, StringComparison.InvariantCultureIgnoreCase)); |
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return filter.GetValue(null, null) as IMatrixFilter; |
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} |
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} |
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} |
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@ -1,37 +0,0 @@ |
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// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="MatrixFilterRegexAttribute.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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// The filter attribute for identifying matrix filter properties.
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// </summary>
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// --------------------------------------------------------------------------------------------------------------------
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namespace ImageProcessor.Imaging.Filters |
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{ |
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using System; |
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/// <summary>
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/// The filter attribute for identifying matrix filter properties.
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/// </summary>
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[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)] |
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public class MatrixFilterRegexAttribute : Attribute |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="MatrixFilterRegexAttribute"/> class.
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/// </summary>
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/// <param name="regexIdentifier">
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/// The regex identifier.
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/// </param>
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public MatrixFilterRegexAttribute(string regexIdentifier) |
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{ |
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this.RegexIdentifier = regexIdentifier; |
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} |
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/// <summary>
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/// Gets the regex identifier.
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/// </summary>
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public string RegexIdentifier { get; private set; } |
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} |
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} |
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