mirror of https://github.com/SixLabors/ImageSharp
James South
14 years ago
6 changed files with 5 additions and 339 deletions
@ -1,332 +0,0 @@ |
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// -----------------------------------------------------------------------
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// <copyright file="Watermark.cs" company="James South">
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// TODO: Update copyright text.
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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.Text.RegularExpressions; |
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using ImageProcessor.Helpers.Extensions; |
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using ImageProcessor.Imaging; |
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#endregion
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/// <summary>
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/// Encapsulates methods to change the alpha component of the image to effect its transparency.
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/// </summary>
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public class Watermark : 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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/// http://stackoverflow.com/questions/11263949/optimize-a-variable-regex
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/// </summary>
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private static readonly Regex QueryRegex = new Regex(@"watermark=(text-\w+\|position-\d+-\d+(\|color-([0-9a-fA-F]{3}){1,2}(\|size-\d+(\|style-(bold|italic|regular|strikeout|underline))?)?)?|\w+)", 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 "Watermark"; |
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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 "Adds a watermark containing text to 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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TextLayer textLayer = new TextLayer(); |
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// Split the string up.
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string[] firstPass = match.Value.Split('=')[1].Split('|'); |
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switch (firstPass.Length) |
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{ |
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case 1: |
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textLayer.Text = firstPass[0]; |
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break; |
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case 2: |
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textLayer.Text = firstPass[0]; |
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textLayer.Position = this.GetPosition(firstPass[1]); |
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break; |
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case 3: |
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textLayer.Text = firstPass[0]; |
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textLayer.Position = this.GetPosition(firstPass[1]); |
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textLayer.TextColor = this.GetColor(firstPass[2]); |
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break; |
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case 4: |
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textLayer.Text = firstPass[0]; |
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textLayer.Position = this.GetPosition(firstPass[1]); |
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textLayer.TextColor = this.GetColor(firstPass[2]); |
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textLayer.FontSize = this.GetFontSize(firstPass[3]); |
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break; |
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case 5: |
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textLayer.Text = firstPass[0]; |
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textLayer.Position = this.GetPosition(firstPass[1]); |
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textLayer.TextColor = this.GetColor(firstPass[2]); |
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textLayer.FontSize = this.GetFontSize(firstPass[3]); |
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textLayer.Style = this.GetFontStyle(firstPass[4]); |
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break; |
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} |
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this.DynamicParameter = textLayer; |
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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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newImage = new Bitmap(image) { Tag = image.Tag }; |
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TextLayer textLayer = this.DynamicParameter; |
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string text = textLayer.Text; |
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int opacity = textLayer.Opacity; |
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int fontSize = textLayer.FontSize; |
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FontStyle fontStyle = textLayer.Style; |
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using (Graphics graphics = Graphics.FromImage(newImage)) |
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{ |
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using (Font font = this.GetFont(textLayer.Font, fontSize, fontStyle)) |
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{ |
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using (StringFormat drawFormat = new StringFormat()) |
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{ |
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using (Brush brush = new SolidBrush(Color.FromArgb(opacity, textLayer.TextColor))) |
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{ |
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Point origin = textLayer.Position; |
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// We need to ensure that there is a position set for the watermark
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if (origin == Point.Empty) |
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{ |
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// Work out the size of the text.
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SizeF textSize = graphics.MeasureString(text, font, new SizeF(image.Width, image.Height), drawFormat); |
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int x = (int)(image.Width - textSize.Width) / 2; |
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int y = (int)(image.Height - textSize.Height) / 2; |
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origin = new Point(x, y); |
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} |
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graphics.DrawString(text, font, brush, origin, drawFormat); |
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} |
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} |
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} |
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image.Dispose(); |
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image = newImage; |
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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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#region Private Methods
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/// <summary>
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/// Returns the correct <see cref="T:System.Drawing.Font"/> for the given parameters
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/// </summary>
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/// <param name="font">
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/// The font.
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/// </param>
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/// <param name="fontSize">
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/// The font size.
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/// </param>
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/// <param name="fontStyle">
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/// The font style.
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/// </param>
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/// <returns>
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/// The correct <see cref="T:System.Drawing.Font"/>
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/// </returns>
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private Font GetFont(string font, int fontSize, FontStyle fontStyle) |
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{ |
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FontFamily fontFamily = string.IsNullOrEmpty(font) ? FontFamily.GenericSansSerif : new FontFamily(font); |
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return new Font(fontFamily, fontSize, fontStyle, GraphicsUnit.Pixel); |
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} |
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/// <summary>
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/// Returns the correct <see cref="T:System.Drawing.Point"/> 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="T:System.Drawing.Point"/>
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/// </returns>
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private Point GetPosition(string input) |
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{ |
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int[] position = input.ToIntegerArray(); |
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int x = position[0]; |
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int y = position[1]; |
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return new Point(x, y); |
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} |
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/// <summary>
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/// Returns the correct <see cref="T:System.Drawing.Color"/> 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="T:System.Drawing.Color"/>
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/// </returns>
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private Color GetColor(string input) |
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{ |
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// split on color-hex
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return ColorTranslator.FromHtml("#" + input.Split('-')[1]); |
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} |
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/// <summary>
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/// Returns the correct <see cref="T:System.Int32"/> 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="T:System.Int32"/>
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/// </returns>
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private int GetFontSize(string input) |
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{ |
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// split on size-value
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return int.Parse(input.Split('-')[1]); |
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} |
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/// <summary>
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/// Returns the correct <see cref="T:System.Drawing.FontStyle"/> for the given string.
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/// </summary>
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/// <param name="input">
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/// The string containing the respective fontstyle.
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/// </param>
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/// <returns>
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/// The correct <see cref="T:System.Drawing.FontStyle"/>
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/// </returns>
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private FontStyle GetFontStyle(string input) |
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{ |
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FontStyle fontStyle = FontStyle.Bold; |
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switch (input.ToLowerInvariant()) |
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{ |
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case "italic": |
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fontStyle = FontStyle.Italic; |
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break; |
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case "regular": |
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fontStyle = FontStyle.Regular; |
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break; |
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case "strikeout": |
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fontStyle = FontStyle.Strikeout; |
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break; |
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case "underline": |
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fontStyle = FontStyle.Underline; |
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break; |
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} |
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return fontStyle; |
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} |
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#endregion
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} |
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} |
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