          <span class="signature">&#8594; const <a href="dart-ui/BlendMode-class.html">BlendMode</a></span>
                  </dt>
        <dd>
          <p>Composite the source image over the destination image, but only where it
overlaps the destination.</p>
<p>This corresponds to the "Source atop Destination" Porter-Duff operator.</p>
<p>This is essentially the <a href="dart-ui/BlendMode-class.html">srcOver</a> operator, but with the output's opacity
channel being set to that of the destination image ins