void ClearRectangleOnBackground(Bitmap *, int, int, int, int);
void BlitBitmapMasked(Bitmap *, Bitmap *, int, int, int, int, int, int);
boolean DrawingDeactivatedField(void);
-boolean DrawingDeactivated(int, int, int, int);
+boolean DrawingDeactivated(int, int);
boolean DrawingOnBackground(int, int);
boolean DrawingAreaChanged(void);
void BlitBitmapOnBackground(Bitmap *, Bitmap *, int, int, int, int, int, int);
void PeekEvent(Event *event);
void PumpEvents(void);
void CheckQuitEvent(void);
-Key GetEventKey(KeyEvent *, boolean);
+Key GetEventKey(KeyEvent *);
KeyMod HandleKeyModState(Key, int);
KeyMod GetKeyModState(void);
KeyMod GetKeyModStateFromEvents(void);