// Dartmouth CS 2, Winter 2009, Chris Bailey-Kellogg
// Notes 19 | Sketch 4
// Uses movie file from Processing example Libraries | Video (Movie) | Loop

import processing.video.*;

Movie station;

void setup()
{
  size(480,360);
  station = new Movie(this, "station.mov");
  station.loop();
}

void draw()
{ 
  if (station.available()) {  // a movie frame is available for reading
    station.read();           // read it
    station.loadPixels();
    // Create a mirror image
    PImage mirr = mirror(station);
    // Checkerboard regular and mirror image
    for (int j=0; j<3; j++)
      for (int i=0; i<3; i++)
        if ((i+j)%2 == 0)
          image(station,i*station.width,j*station.height);
        else
          image(mirr,i*mirr.width,j*mirr.height);
  }
}

// Returns a new image that is the mirror image of img
PImage mirror(PImage img)
{
  PImage m = createImage(img.width, img.height, RGB);
  for (int y=0; y<img.height; y++)
    for (int x=0; x<img.width; x++)
      m.pixels[x+y*img.width] = img.pixels[(img.width-1)-x + y*img.width];

  return m;
}