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