/// <summary>
/// Applies the pixelate effect in given frame.
/// </summary>
/// <param name="image">The image to pixelate.</param>
/// <param name="rectangle">The area to pixelate.</param>
/// <param name="pixelateSize">The size of the pixel.</param>
/// <param name="useMedian">Calculate the median color of the pixel block.</param>
/// <returns>A pixelated Bitmap.</returns>
public static BitmapSource Pixelate(BitmapSource image, Int32Rect rectangle, int pixelateSize, bool useMedian)
{
var croppedImage = new CroppedBitmap(image, rectangle);
var pixelUtil = new PixelUtil(croppedImage);
pixelUtil.LockBits();
//Loop through all the blocks that should be pixelated.
for (var xx = 0; xx < croppedImage.PixelWidth; xx += pixelateSize)
{
for (var yy = 0; yy < croppedImage.PixelHeight; yy += pixelateSize)
{
var offsetX = pixelateSize / 2;
var offsetY = pixelateSize / 2;
if (xx + offsetX >= croppedImage.PixelWidth)
{
offsetX = croppedImage.PixelWidth;
}
if (yy + offsetY >= croppedImage.PixelHeight)
{
offsetY = croppedImage.PixelHeight;
}
//Get the pixel color in the center of the soon to be pixelated area.
var pixel = useMedian ? pixelUtil.GetMedianColor(xx, yy, offsetX, offsetY) : pixelUtil.GetPixel(xx + offsetX, yy + offsetY);
//For each pixel in the pixelate size, set it to the center color.
for (var x = xx; x < xx + pixelateSize && x < croppedImage.PixelWidth; x++)
{
for (var y = yy; y < yy + pixelateSize && y < croppedImage.PixelHeight; y++)
{
pixelUtil.SetPixel(x, y, pixel);
}
}
}
}
return(pixelUtil.UnlockBits());
}