<span class="keyword">struct </span>row_buffer_helper</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;&lt;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    Pixel,</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    typename std::enable_if</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    &lt;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</s