class Mutation {

  Mutation() { 
  }

  void mutate(PGraphics pg) {
    pg.filter(INVERT);
  }

}

class InvertMutation extends Mutation { 
}

class PosterizeMutation extends Mutation {

  void mutate(PGraphics pg) {
    pg.filter(POSTERIZE, 4);
  }

}

class BlurMutation extends Mutation {

  void mutate(PGraphics pg) {
    pg.filter(BLUR, 3);
  }

}

class ReddenMutation extends Mutation {

  void mutate(PGraphics pg) {
    pg.beginDraw();
    pg.noStroke();
    pg.fill(255, 0, 0, 64);
    pg.rect(0, 0, 32, 32);
    pg.endDraw();
  }

}

class VerticalMirrorMutation extends Mutation {
  
  void mutate(PGraphics pg) {
    pg.beginDraw();
    for (int i = 0; i < 16; i++) {
      for (int j = 0; j < 32; j++) {
        pg.set(i, j, pg.get(32-i, j));
      }
    }
    pg.endDraw();
  }
  
}

class HorizontalMirrorMutation extends Mutation {
  
  void mutate(PGraphics pg) {
    pg.beginDraw();
    for (int i = 0; i < 32; i++) {
      for (int j = 0; j < 16; j++) {
        pg.set(i, j, pg.get(i, 32-j));
      }
    }
    pg.endDraw();
  }
  
}