void bmp1_alloc (int columns, int rows);
void bmp1_write (char *filename, int adjust);
void bmp1_point (int column, int row);
void bmp1_square (int column, int row, int size);
void bmp1_lineto(int oldx, int oldy, int newx, int newy);
void bmp1_xy (double x, double y);
void bmp1_clip_rect (int x1, int y1, int x2, int y2);
long bmp1_clip_count (void);