sclass IIBWVirtualClip extends Meta implements IBWIntegralImage {
  IBWIntegralImage fullImage;
  int x1, y1, w, h;
  
  *() {}
  *(IBWIntegralImage fullImage, Rect r) {
    this(fullImage, r.x, r.y, r.w, r.h);
  }
  *(IBWIntegralImage *fullImage, int *x1, int *y1, int *w, int *h) {
    optimize();
  }
  
  public int getWidth() { ret w; }
  public int getHeight() { ret h; }

  public int getIIValue(int x, int y) {
    ret fullImage.getIIValue(x+x1, y+y1);
  }
  
  public double getIIValue(double x, double y) {
    ret fullImage.getIIValue(x+x1, y+y1);
  }
  
  public BufferedImage getBufferedImage() {
    ret clipBufferedImage(fullImage.getBufferedImage(), x1, y1, w, h);
  }
  
  void optimize {
    if (fullImage cast IIBWVirtualClip) {
      x1 += fullImage.x1;
      y1 += fullImage.y1;
      fullImage = fullImage.fullImage;
    }
  }
}

Began life as a copy of #1031960