static void gui_setup_refresh(DisplayState *ds)
{
    DisplayChangeListener *dcl;
    bool need_timer = false;
    bool have_gfx = false;
    bool have_text = false;

    QLIST_FOREACH(dcl, &ds->listeners, next) {
        if (dcl->ops->dpy_refresh != NULL) {
            need_timer = true;
        }
        if (dcl->ops->dpy_gfx_update != NULL) {
            have_gfx = true;
        }
        if (dcl->ops->dpy_text_update != NULL) {
            have_text = true;
        }
    }

    if (need_timer && ds->gui_timer == NULL) {
        ds->gui_timer = timer_new_ms(QEMU_CLOCK_REALTIME, gui_update, ds);
        timer_mod(ds->gui_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
    }
    if (!need_timer && ds->gui_timer != NULL) {
        timer_del(ds->gui_timer);
        timer_free(ds->gui_timer);
        ds->gui_timer = NULL;
    }

    ds->have_gfx = have_gfx;
    ds->have_text = have_text;
}
static void gui_setup_refresh(DisplayState *ds)
{
    DisplayChangeListener *dcl;
    bool need_timer = false;
    bool have_gfx = false;
    bool have_text = false;

    QLIST_FOREACH(dcl, &ds->listeners, next) {
        if (dcl->ops->dpy_refresh != NULL) {
            need_timer = true;
        }
        if (dcl->ops->dpy_gfx_update != NULL) {
            have_gfx = true;
        }
        if (dcl->ops->dpy_text_update != NULL) {
            have_text = true;
        }
    }

    if (need_timer && ds->gui_timer == NULL) {
        ds->gui_timer = timer_new_ms(QEMU_CLOCK_REALTIME, gui_update, ds);
        timer_mod(ds->gui_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
    }
    if (!need_timer && ds->gui_timer != NULL) {
        timer_del(ds->gui_timer);
        timer_free(ds->gui_timer);
        ds->gui_timer = NULL;
    }

    ds->have_gfx = have_gfx;
    ds->have_text = have_text;
}