inline boolean DrawingOnBackground(int, int);
inline void BlitBitmapOnBackground(Bitmap *, Bitmap *, int, int, int, int, int,
int);
+inline void DrawSimpleBlackLine(Bitmap *, int, int, int, int);
inline void DrawSimpleWhiteLine(Bitmap *, int, int, int, int);
inline void DrawLines(Bitmap *, struct XY *, int, Pixel);
inline Pixel GetPixel(Bitmap *, int, int);