svoid bench_iiBrightnessOfArea() {
  IntegralImage ii = integralImageFromScreenshot();
  
  int n = oneBillion(), w = ii.getWidth(), h = ii.getHeight();
  double d = 0;
  time { repeat n { d += ii_averageBrightnessOfArea(ii, 0, 0, w, h); } }
  print(d);
  printBenchResult(n);
}