void ClearRectangle(Bitmap *, int, int, int, int);
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 DrawingOnBackground(int, int);
boolean DrawingAreaChanged();
void SetAudioMode(boolean);
boolean PendingEvent(void);
-void NextEvent(Event *event);
+void WaitEvent(Event *event);
void PeekEvent(Event *event);
void CheckQuitEvent(void);
Key GetEventKey(KeyEvent *, boolean);