set_background_alpha  926 gui/gui.cpp        _stage->set_background_alpha(background ? 1.0f : 0.05f);
set_background_alpha  472 gui/pythonmod/gnash-view.cpp     view->stage->set_background_alpha(1.0f);
set_background_alpha  374 libcore/movie_root.h     void set_background_alpha(float alpha);
set_background_alpha  489 plugin/aos4/plugin.cpp     root.set_background_alpha(1.0f);
set_background_alpha  487 plugin/win32/plugin.cpp     root.set_background_alpha(1.0f);