no">  344</span>&#160;      std::vector&lt;float&gt; values;</div><div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;      <span class="keywordflow">if</span> (!mask(y, x)) {</div><div class="line"><a name="l00346"></a><span class="lineno">  346</span>&#160;        <span class="keywordflow">if</span> (!background.empty()) {</div><div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;          blurred(y, x) = background(y, x);</div><div class="line"><a name="