gistfile1.pde

PImage img;
String filename = "chisas.jpg";

void setup() {
  img = loadImage(filename);
  
  size(img.width, img.height);
  
  noLoop();
}

void draw() {
  image(img, 0, 0);
  
  loadPixels();
  
  int i;
  for(i = 0; i < 8; i++) {
    sortCols();
    sortRows();
    
    shiftLeft(1);
  } 
  
  updatePixels();
  
  // saveFrame(filename + "-" + second() + "-" + millis() + ".png");
}

void sortRows() {
  int i;
 for(i = 0; i < height; i++) {
    sortRow(i, 0, width); 
  } 
}

void sortCols() {
  int i;
 for(i = 0; i < width; i++) {
    sortCol(i, 0, height); 
  } 
}

void shiftLeft(int shift) {
  int i;
  
  for(i = 0; i < pixels.length; i++) {
    pixels[i] = pixels[i] << shift;
  } 
}

void shiftRight(int shift) {
  int i;
  
  for(i = 0; i < pixels.length; i++) {
    pixels[i] = pixels[i] >> shift;
  } 
}

void sortRow(int y, int from, int to) {
  int length = to - from;
  int[] unsorted = new int[length];
  int[] sorted;
  int i;
  
  for(i = 0; i < length; i++) {
    unsorted[i] = pixels[from + i + y * width];
  }
  
  sorted = sort(unsorted);
  
  for(i = 0; i < length; i++) {
    pixels[from + i + y * width] = sorted[i];
  }
}

void sortCol(int x, int from, int to) {
  int length = to - from;
  int[] unsorted = new int[length];
  int[] sorted;
  int i;
  
  for(i = 0; i < length; i++) {
    unsorted[i] = pixels[(from + i) * width + x]; 
  }
  
  sorted = sort(unsorted);
  
  for(i = 0; i < length; i++) {
    pixels[(from + i) * width + x] = sorted[i]; 
  }
}