Enable direct mode

Author: lupyuen

display.c

@@ -90,6 +90,9 @@ void init_disp_drv(
   // Set the Horizontal and Vertical Resolution
   disp_drv->hor_res = hor_res;
   disp_drv->ver_res = ver_res;
+
+  // Use screen-sized buffers and draw to absolute coordinates
+  disp_drv->direct_mode = 1;
 }
 
 /****************************************************************************

feature-phone.wasm

@@ -188,6 +188,7 @@ fn createButton() void {
     const btn = c.lv_btn_create(c.lv_scr_act());
     _ = c.lv_obj_add_event_cb(btn, eventHandler, c.LV_EVENT_ALL, null);
     c.lv_obj_align(btn, c.LV_ALIGN_CENTER, 0, 40);
+    c.lv_obj_add_flag(btn, c.LV_OBJ_FLAG_CHECKABLE);
 
     const label = c.lv_label_create(btn);
     c.lv_label_set_text(label, "Button");