typedef struct Mouseinfo Mouseinfo;typedef struct Mousestate Mousestate;typedef struct Cursorinfo Cursorinfo;typedef struct Screeninfo Screeninfo; #define Mousequeue 16		/* queue can only have Mousequeue-1 elements */#define Mousewindow 500		/* mouse event window in millisec */ struct Mousestate {	int	buttons;	Point	xy;	ulong	msec;}; struct Mouseinfo {	Lock	lk;	Mousestate queue[Mousequeue];	int	ri, wi;	int	lastb;	int	trans;	int	open;	Rendez	r;}; struct Cursorinfo {	Lock	lk;	Point	offset;	uchar	clr[2*16];	uchar	set[2*16];}; struct Screeninfo {	Lock		lk;	Memimage	*newsoft;	int		reshaped;	int		depth;	int		dibtype;}; #define screen	w32screenextern	Memimage *gscreen;extern	Screeninfo screen; void	screeninit(void);void	screenload(Rectangle, int, uchar *, Point, int); void	getcolor(ulong, ulong*, ulong*, ulong*);void	setcolor(ulong, ulong, ulong, ulong); void	refreshrect(Rectangle); void	cursorarrow(void);void	drawflushr(Rectangle);void	flushmemscreen(Rectangle);uchar *attachscreen(Rectangle*, ulong*, int*, int*, int*, void**);