 class="docutils literal"><span class="pre">Return</span></tt> <tt class="docutils literal"><span class="pre">0</span></tt> if the window has a shape and, provided <tt class="docutils literal"><span class="pre">shape_mode</span></tt> was not <tt class="docutils literal"><span class="pre">nil</span></tt>, <tt class="docutils literal"><span class="pre">shape_mode</span></tt> has been filled with the mode data, <tt class="docutils literal"><span class="pre">NONSHAPEABLE_WINDOW</span></tt> if the <tt class="doc