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  // Need external definition of: scaleX, scaleY
  
  // Up to scaleX-1 pixel columns and scaleY pixel rows may be discarded
  // (those not fitting in a scaleX*scaleY block). The discarded pixels are
  // along the right and bottom border of the image, respectively.
  
  // Benchmark on screenshot for 1 MP: 2.6ms or less (twice as fast as scaleImage!)

  int w, h, w2, h2;
  int[] finalPixels;
  
  void scaleDown(BufferedImage img) {
    scaleDown(main grabbableIntPixels(img));
  }
    
  void scaleDown(GrabbableIntPixels gp) {
    w = gp.w;
    int h = this.h = gp.h;
    int w2 = this.w2 = w/scaleX, h2 = this.h2 = h/scaleY;
    int stride = gp.scanlineStride;
    int scaleArea = scaleX*scaleY;
    
    int[] newPixels = finalPixels = new int[w2*h2];
  
    int iRow = gp.offset, iOut = 0;
    int[] pixels = gp.data;
    
    for y to h2: {
      int iIn = iRow;
    
      for x to w2: {
        // making one pixel of output image inside this block
        
        int r = 0, g = 0, b = 0;
        
        int iSub = iIn;
        for subY to scaleY: {
          for subX to scaleX: {
            int rgb = pixels[iSub+subX];
            r += (rgb >> 16) & 0xFF;
            g += (rgb >> 8) & 0xFF;
            b += rgb & 0xFF;
          }
          iSub += stride;
        }
    
        iIn += scaleX; // advance input scaleX pixels to the right
        newPixels[iOut++] = rgbIntFullAlpha(r/scaleArea, g/scaleArea, b/scaleArea);
      }
    
      iRow += stride*scaleY;
    } // for y
  }
  
  BufferedImage get(BufferedImage img) {
    scaleDown(img);
    ret get();
  }
  
  BufferedImage get() {
    ret bufferedImage(w2, h2, finalPixels);
  }
  
  GrabbableIntPixels grabbableIntPixels() {
    ret GrabbableIntPixels(finalPixels, w2, h2, 0, w2);
  }