Speeding up GetPixel with Unsafe Code, Part II

In relation to my previous article on replacing GetPixel, I didn't include an example of how to replace SetPixel. So if you haven't figured it out, here's an example that will colour every pixel in a bitmap red, which should point you in the right direction.

private static void SetPixelExample(ref Bitmap bitmap)
{
  int CurScanLine = 0;
  Rectangle Rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
  BitmapData TempBitmapData =
    bitmap.LockBits(Rect, ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);

  while (CurScanLine < bitmap.Height)
  {
      for (int x = 0; x < bitmap.Width; x++)
      {
          SetPixelNew(ref TempBitmapData, x, CurScanLine, Color.Red);
      }
      CurScanLine++;
  }

  bitmap.UnlockBits(TempBitmapData);          
}

private static unsafe void SetPixelNew(ref BitmapData bitmapData, int x, int y, Color colour)
{
  byte* PixelPointer = null; // Pointer to our pixel data  
  int ColourPlanes = 3;
  PixelPointer = (byte*)bitmapData.Scan0 + (y * bitmapData.Stride);
  PixelPointer[ColourPlanes * x] = colour.B;
  PixelPointer[(ColourPlanes * x) + 1] = colour.G;
  PixelPointer[(ColourPlanes * x) + 2] = colour.R;
}

I've used a similar technique to write a speedy PCX image file decoder which decodes the PCX file, places it in a byte array then writes the colour data to a bitmap, which is one possible application to consider.