Masks an image and returns a two color bitmap. : Color « 2D Graphics « C# / C Sharp

Masks an image and returns a two color bitmap.


using System;
using System.Drawing;
using System.IO;
using System.Reflection;
using System.Collections.Generic;

namespace Sqt.VisualStudio.Util
  /// <summary>
  /// Helpers for images and bitmap handling.
  /// </summary>
  internal static class ImageHelper
    /// <summary>
    /// Loads an embedded resource image.
    /// </summary>
    /// <param name="resourceAssembly">The resource assembly usually the assembly of the code that calls this method.</param>
    /// <param name="resourcePath">The resource path.</param>
    /// <returns></returns>
    internal static Image LoadEmbeddedImageResource( Assembly resourceAssembly, string resourcePath )
      if ( String.IsNullOrEmpty( resourcePath ) ) 
        throw new ArgumentNullException( "resourcePath" );

      Stream stream = resourceAssembly.GetManifestResourceStream( resourcePath );
      if ( stream == null ) {
        throw new ArgumentException( "Can't find the resource " + resourcePath, "resourcePath" );
      Image bitmap = Image.FromStream( stream );
      return bitmap;

    /// <summary>
    /// Masks an image and returns a two color bitmap.
    /// </summary>
    /// <param name="image">The image to convert to a maskColor.</param>
    /// <param name="maskColor">The color used for masking.</param>
    /// <param name="unmaskColor">
    /// The color used when an image pixel has not a masking color.
    /// If the value is <see cref="P:Color.Empty"/> the original color
    /// will be used.
    /// </param>
    /// <param name="colorsToMask">The colors to replace with the maskColor color.</param>
    /// <returns></returns>
    internal static Image GetMask( Image image, Color maskColor, Color unmaskColor, params Color[] colorsToMask )
      if ( image == null )
        throw new ArgumentNullException( "image" );

      if ( colorsToMask == null )
        throw new ArgumentNullException( "colorsToMask" );

      List<Color> colorsToMaskList = new List<Color>( colorsToMask );
      bool isUnmaskDefined = unmaskColor != Color.Empty;
      Bitmap bitmap = new Bitmap( image );
      EqualColorPredicate equalColorPredicate = new EqualColorPredicate();

      for ( int y = 0; y < bitmap.Height; y++ ) {
        for ( int x = 0; x < bitmap.Width; x++ ) {
          Color pixel = bitmap.GetPixel( x, y );
          equalColorPredicate.Pixel = pixel;

          if ( colorsToMaskList.Exists( equalColorPredicate.Matches ) )
            bitmap.SetPixel( x, y, maskColor );
          else if ( isUnmaskDefined )
            bitmap.SetPixel( x, y, unmaskColor );

      return bitmap;

    /// <summary>
    /// Helper predicate to check color equality.
    /// </summary>
    /// <remarks>
    /// Its not possibile to use <see cref="M:Color.Equals"/>
    /// because the methode returns <c>false</c> if one of the colors
    /// compared is a named color and the other not, even if their
    /// RGB and alpha values are the same.
    /// </remarks>
    private class EqualColorPredicate
      private Color pixel;

      public EqualColorPredicate()

      public Color Pixel
        get { return this.pixel; }
        set { this.pixel = value; }

      public bool Matches( Color color )
        return color.R == Pixel.R && color.G == Pixel.G 
            && color.B == Pixel.B && color.A == Pixel.A;



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