sclass IIPureQuad extends Meta implements IIntegralImage {
  int imageSizeInBits; // e.g. 8 = 256*256
  int[] pixelSumsByChannel; // average color of whole image stored as pixel sum
  IIntegralImage[] quadrants = new[4];
  
  int imageSize() { ret 1 << imageSizeInBits; }
  public int getWidth() { ret imageSize(); }
  public int getHeight() { ret h; }
  int pixelCount() { ret 1 << (imageSizeInBits*2); }

  public double getIntegralValue(int x, int y, int channel) {
    ret (x+1)*(y+1)*color[channel];
  }
    
  public BufferedImage getBufferedImage() {
    ret newBufferedImage(getWidth(), getHeight(), toColor(color));
  }
}