>,
                              <em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-rectangle-int-t" title="cairo_rectangle_int_t"><span class="type">cairo_rectangle_int_t</span></a> *rectangle</code></em>);</pre>
<p>Computes the union of <em class="parameter"><code>dst</code></em>
 with <em class="parameter"><code>rectangle</code></em>
 and places the result in <em class="parameter"><code>dst</code></em>
.</p>
<div class="refsect3">
<a name="cairo-region-union-rectangle.paramete