ref: af720a92c15c5754fc0f3df0d1d95ed7cdf61a02
dir: /include/memlayer.h/
#ifdef PLAN9
#pragma src "/sys/src/libmemlayer"
#pragma lib "libmemlayer.a"
#endif
typedef struct Memscreen Memscreen;
typedef void (*Refreshfn)(Memimage*, Rectangle, void*);
struct Memscreen
{
Memimage *frontmost; /* frontmost layer on screen */
Memimage *rearmost; /* rearmost layer on screen */
Memimage *image; /* upon which all layers are drawn */
Memimage *fill; /* if non-zero, picture to use when repainting */
};
struct Memlayer
{
Rectangle screenr; /* true position of layer on screen */
Point delta; /* add delta to go from image coords to screen */
Memscreen *screen; /* screen this layer belongs to */
Memimage *front; /* window in front of this one */
Memimage *rear; /* window behind this one*/
int clear; /* layer is fully visible */
Memimage *save; /* save area for obscured parts */
Refreshfn refreshfn; /* function to call to refresh obscured parts if save==nil */
void *refreshptr; /* argument to refreshfn */
};
/*
* These functions accept local coordinates
*/
int memload(Memimage*, Rectangle, uchar*, int, int);
int memunload(Memimage*, Rectangle, uchar*, int);
/*
* All these functions accept screen coordinates, not local ones.
*/
void _memlayerop(void (*fn)(Memimage*, Rectangle, Rectangle, void*, int), Memimage*, Rectangle, Rectangle, void*);
Memimage* memlalloc(Memscreen*, Rectangle, Refreshfn, void*, ulong);
void memldelete(Memimage*);
void memlfree(Memimage*);
void memltofront(Memimage*);
void memltofrontn(Memimage**, int);
void _memltofrontfill(Memimage*, int);
void memltorear(Memimage*);
void memltorearn(Memimage**, int);
int memlsetrefresh(Memimage*, Refreshfn, void*);
void memlhide(Memimage*, Rectangle);
void memlexpose(Memimage*, Rectangle);
void _memlsetclear(Memscreen*);
int memlorigin(Memimage*, Point, Point);
void memlnorefresh(Memimage*, Rectangle, void*);