meta-for IntegralImage also as IIntegralImage {

  static int[] scaledPixelsFromIntegralImage(int w, IntegralImage img) {
    ret scaledPixelsFromIntegralImage(img, w);
  }
  
  static int[] scaledPixelsFromIntegralImage(IntegralImage img, int w,
    int h default heightForWidth(img, w)) {
    int w1 = img.getWidth(), h1 = img.getHeight();
    double stepX = doubleRatio(w1, w), stepY = doubleRatio(h1, h);
    int[] pixels = new[w*h];
    int i = 0;
    double srcY = 0;
    
    for y to h: {
      double srcX = 0, nextSrcY = srcY+stepY;
      
      for x to w: {
        double nextSrcX = srcX+stepX;
        dbl area = (x2-x1)*(y2-y1);
        dbl r = doubleRatio(img.rectSum(srcX, srcY, nextSrcX, nextSrcY, 0), area);
        dbl g = doubleRatio(img.rectSum(srcX, srcY, nextSrcX, nextSrcY), area);
        dbl b = doubleRatio(img.rectSum(srcX, srcY, nextSrcX, nextSrcY), area);
        pixels[i++] = rgbIntFromDoubles_fullAlpha(r, g, b);
        srcX = nextSrcX;
      }
      srcY = nextSrcY;
    }
    
    ret pixels;
  }

}