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ColorSampler.cs (1325B)

      1 using Windows.Graphics.Imaging;
      2 using Windows.UI;
      3 using Windows.UI.Xaml.Media.Imaging;
      4 
      5 namespace File360
      6 {
      7     class ColorSampler
      8     {
      9         public Color GetPixel(WriteableBitmap wb)
     10         {
     11             int pixel; //ARGB variable with 32 int bytes where
     12                        //sets of 8 bytes are: Alpha, Red, Green, Blue
     13             byte r = 0;
     14             byte g = 0;
     15             byte b = 0;
     16             int i = 0;
     17             int j = 0;
     18             //Skip every alternate pixel making the program 4 times faster
     19             for (i = 0; i < wb.PixelWidth; i = i + 2)
     20             {
     21                 for (j = 0; j < wb.PixelHeight; j = j + 2)
     22                 {
     23                     pixel = WriteableBitmapExtensions.GetPixeli(wb,i,j); //the ARGB integer(pixel) has the colors of pixel (i,j)
     24                     r = (byte)(r + (255 & (pixel >> 16))); //add up reds
     25                     g = (byte)(g + (255 & (pixel >> 8))); //add up greens
     26                     b = (byte)(b + (255 & (pixel))); //add up blues
     27                 }
     28             }
     29             r = (byte)(r / (wb.PixelWidth/2 * wb.PixelHeight/2));
     30             g = (byte)(g / (wb.PixelWidth / 2 * wb.PixelHeight / 2));
     31             b = (byte)(b / (wb.PixelWidth / 2 * wb.PixelHeight / 2));
     32             return Color.FromArgb(100, r, g, b);
     33         }
     34     }
     35     
     36 }