inline void ClearRectangle(Bitmap *, int, int, int, int);
inline void ClearRectangleOnBackground(Bitmap *, int, int, int, int);
inline void SetClipMask(Bitmap *, GC, Pixmap);
inline void ClearRectangle(Bitmap *, int, int, int, int);
inline void ClearRectangleOnBackground(Bitmap *, int, int, int, int);
inline void SetClipMask(Bitmap *, GC, Pixmap);