// forgets sub-pixels
sclass TruncatedIBWIntegralImage is IBWIntegralImage {
  IBWIntegralImage img;
  int w, h;

  *(IBWIntegralImage *img) {
    w = img.getWidth();
    h = img.getHeight();
  }
    
  public int getWidth() { ret w; }
  public int getHeight() { ret h; }
    
  // get value for 1 channel
  // normal range [0; pixelCount*256)
  public double getIIValue(dbl x, dbl y) {
    ret img.getIIValue(ifloor(x), ifloor(y));
  }
}