VCONS_DONT_DRAW
#define SCREEN_CAN_DRAW(scr) (((scr)->scr_flags & VCONS_DONT_DRAW) == 0)
#define SCREEN_DISABLE_DRAWING(scr) ((scr)->scr_flags |= VCONS_DONT_DRAW)
#define SCREEN_ENABLE_DRAWING(scr) ((scr)->scr_flags &= ~VCONS_DONT_DRAW)