+ EDL *edl = command->get_edl();
+ PlaybackConfig *config = edl->session->playback_config;
+ if( config->vconfig->driver == PLAYBACK_X11_GL ) {
+ if( render_engine && render_engine->video ) {
+ VDeviceBase *vdriver = render_engine->video->get_output_base();
+ ((VDeviceX11*)vdriver)->clear_output();
+ return;
+ }
+ }
+ BC_WindowBase *window = output->get_canvas();
+ if( !window ) return;
+ window->lock_window("PlaybackEngine::clear_output");
+ output->clear_borders(edl);
+ window->unlock_window();