>])) * rbs
          r_in_sum += pr
          g_in_sum += pg
          b_in_sum += pb
          stack = stack.next
          yp += width  <span class="keyword">if</span> i &lt; heightMinus1
          
        yi = x
        stackIn = stackStart
        stackOut = stackEnd
        
        <span class="keyword">for</span> y <span class="keyword">in</span> [<span class="number">0.</span>..height]
          p = yi &lt;&lt; <span class="number">2</span>
          pixels[p] = (r_sum * mul_sum) &gt;&gt; shg_sum
 