e writable), <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> may be
used to specify no output. This will generate a PS surface that
may be queried and used as a source, without generating a
temporary file.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width_in_points</p></td>
<td class="parameter_description"><p>width of the surface, in points (1 point == 1/72.0 inch)</p></td>
<td class="parameter_