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>..radiusPlus1]
          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</span