se it decides whether or not only visible sprites should be rendered - <span class='object_link'><a href="#render_only_visible-instance_method" title="Zif::Layers::SimpleLayer#render_only_visible (method)">#render_only_visible</a></span> - and then calls <span class='object_link'><a href="../RenderTarget.html#redraw-instance_method" title="Zif::RenderTarget#redraw (method)">RenderTarget#redraw</a></span></p>

<p>Finally, it may clear <span class='object_link'><a href="#source_sprites-instance_method" title=