 The initial
contents of <em class="parameter"><code>data</code></em>
 will be used as the initial image contents; you
must explicitly clear the buffer, using, for example,
<a class="link" href="cairo-Paths.html#cairo-rectangle" title="cairo_rectangle ()"><code class="function">cairo_rectangle()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a> if you want it cleared.</p>
<p>Note that the stride may be larger than
width