typedef struct Mouseinfo Mouseinfo;typedef struct Mousestate Mousestate;typedef struct Cursorinfo Cursorinfo; struct Mousestate {	Point	xy;	int	buttons;	ulong	counter;	ulong	msec;}; struct Mouseinfo {	Lock		lk;	Mousestate	state;	ulong		lastcounter;	int		resize;		/* generate resize event */	Rendez		r;	int		open;	Mousestate	queue[16];	/* circular buffer of click events */	ulong		ri;		/* read index into queue */	ulong		wi;		/* write index into queue */}; struct Cursorinfo {	Lock	lk;	Point	offset;	uchar	clr[2*16];	uchar	set[2*16];}; extern	Memimage *gscreen;extern	Mouseinfo mouse;extern	Cursorinfo cursor;extern	Cursorinfo arrow; void	screeninit(void);void	screenload(Rectangle, int, uchar *, Point, int); void	getcolor(ulong, ulong*, ulong*, ulong*);void	setcolor(ulong, ulong, ulong, ulong); void	setcursor(void);void	mouseset(Point);void	flushmemscreen(Rectangle);Memdata*attachscreen(Rectangle*, ulong*, int*, int*, int*);void	deletescreenimage(void);void	resetscreenimage(void); extern	QLock drawlock;#define	ishwimage(i)	0 void	terminit(void);void	screenresize(Rectangle);void	screensize(Rectangle, ulong); void	mouseresize(void);void	mousetrack(int, int, int, ulong);void	absmousetrack(int, int, int, ulong);void	cpubody(void);void	guimain(void);