import processing.video.*;

PImage img, imgOrig;
MovieMaker mm;	
boolean recordMovie = true;
int iteration = 0;

void setup()
{
  imgOrig = loadImage("puffball.png");
  img = imgOrig;
  size(img.width, img.height, P2D);

  if(recordMovie)
  {
    mm = new MovieMaker(this, img.width, img.height, "catmap.mov");
  }
}

boolean equal(PImage p1, PImage p2)
{
  for(int i = 0; i < p1.pixels.length; i++)
  {
    if(p1.pixels[i] != p2.pixels[i]) return false;
  }

  return true;
}

void draw()
{
  image(img, 0, 0);	

  if(recordMovie) mm.addFrame();

  if(equal(img, imgOrig) && iteration > 0)
  {
    noLoop();
    if(recordMovie) mm.finish();
  }

  PImage imgNext = createImage(img.width, img.height, RGB);

  for(int y = 0; y < img.height; y++)
  {
    for(int x = 0; x < img.width; x++)
    {
      int pixel = img.pixels[y*img.width + x];
      int xNew = (2*x + y) % img.width;
      int yNew = (x + y) % img.height;
      imgNext.pixels[yNew*img.width + xNew] = pixel;
    }
  }

  img = imgNext;
  iteration++;
}