r = pr
        stack.g = pg
        stack.b = pb
        stack = stack.next
        
      yp = width
      
      <span class="keyword">for</span> i <span class="keyword">in</span> [<span class="number">1.</span>.radius]
        yi = (yp + x) &lt;&lt; <span class="number">2</span>

        r_sum += (stack.r = (pr = pixels[yi])) * (rbs = radiusPlus1 - i)
        g_sum += (stack.g = (pg = pixels[yi + <span class="number">1</span>])) * rbs
        b_sum += (stack.b = (pb = pixels[yi + <span class="number">2</