="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">  X(color_levels, &quot;video/color_levels&quot;)                               \</span></div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">  X(confidence, &quot;confidence&quot;)                                         \</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="preprocessor">  X(cost, &quot;cos