#include <cassert>
#include <algorithm>

//From http://www.richelbilderbeek.nl
void DoPixelateRgb(
  const TImage * const imageOriginal,
  TImage * const imageResult,
  const int pixelSize)
{
  assert(imageOriginal!=0);
  assert(imageResult!=0);

  imageResult->Picture->Graphic = imageOriginal->Picture->Graphic;

  assert(imageOriginal->Picture->Bitmap->Width  == imageResult->Picture->Bitmap->Width );
  assert(imageOriginal->Picture->Bitmap->Height == imageResult->Picture->Bitmap->Height);

  const int width  = imageOriginal->Picture->Bitmap->Width;
  const int height = imageOriginal->Picture->Bitmap->Height;
  const int maxx = 1 + (width  / pixelSize);
  const int maxy = 1 + (height / pixelSize);

  for (int y=0; y!=maxy; ++y)
  {
    const int y1 = (y * pixelSize);
    if (y1 >= height) continue;
    const int y2 = std::min( y1 + pixelSize, height);
    assert(y1 <= height);
    assert(y2 <= height);
    assert(y1!=y2);

    for (int x=0; x!=maxx; ++x)
    {
      const int x1 = (x * pixelSize);
      if (x1 >= width) continue;
      const int x2 = std::min( x1 + pixelSize, width);
      assert(x1 <= width);
      assert(x2 <= width);
      assert(x1!=x2);


      unsigned char r,g,b;
      GetPixel(imageOriginal,
        x1, y1, x2, y2,
        r,g,b);
      SetPixel(
        imageResult,
        x1, y1, x2, y2,
        r,g,b);
    }
  }
}



#include <cassert>
#include <algorithm>

//From http://www.richelbilderbeek.nl
void DoPixelateGrey(
  const TImage * const imageOriginal,
  TImage * const imageResult,
  const int pixelSize)
{
  assert(imageOriginal!=0);
  assert(imageResult!=0);

  imageResult->Picture->Graphic = imageOriginal->Picture->Graphic;

  assert(imageOriginal->Picture->Bitmap->Width  == imageResult->Picture->Bitmap->Width );
  assert(imageOriginal->Picture->Bitmap->Height == imageResult->Picture->Bitmap->Height);

  const int width  = imageOriginal->Picture->Bitmap->Width;
  const int height = imageOriginal->Picture->Bitmap->Height;
  const int maxx = 1 + (width  / pixelSize);
  const int maxy = 1 + (height / pixelSize);

  for (int y=0; y!=maxy; ++y)
  {
    const int y1 = (y * pixelSize);
    if (y1 >= height) continue;
    const int y2 = std::min( y1 + pixelSize, height );
    assert(y1 <= height);
    assert(y2 <= height);
    assert(y1!=y2);

    for (int x=0; x!=maxx; ++x)
    {
      const int x1 = (x * pixelSize);
      if (x1 >= width) continue;
      const int x2 = std::min( x1 + pixelSize, width );
      assert(x1 <= width);
      assert(x2 <= width);
      assert(x1!=x2);
      const int grey = GetGreyness(imageOriginal,x1,y1,x2,y2);
      SetGreyness(imageResult,x1,y1,x2,y2,grey);
    }
  }
}