k.</p>
<p>This is very slow. It has no bleeding edge artifacts (that <a href="dart-ui/Clip-class.html">antiAlias</a> has)
but it changes the semantics as an offscreen buffer is now introduced.
(See <a href="https://github.com/flutter/flutter/issues/18057#issuecomment-394197336">https://github.com/flutter/flutter/issues/18057#issuecomment-394197336</a>
for a difference between paint without saveLayer and paint with saveLayer.)</p>
<p>This will be only rarely needed. One case where you might need this is if
y