l always be greater than 0.</dd>
<dd><code>bytesPerPixel</code> - The number of bytes representing a single
        pixel, rounded up to an integer.  This is the 'bpp' parameter
        described in the PNG specification.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The filter type to be used.  The entry of
         <code>scratchRows[]</code> at this index holds the
         filtered data.</dd>
</dl>
</li>
</ul>
</li>
</ul>
</section>
</li>
</ul>
</div>
</div>
</main>
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