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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <memdraw.h>
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#include <memlayer.h>
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int
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memlsetrefresh(Memimage *i, Refreshfn fn, void *ptr)
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{
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	Memlayer *l;
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	l = i->layer;
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	if(l->refreshfn!=nil && fn!=nil){	/* just change functions */
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		l->refreshfn = fn;
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		l->refreshptr = ptr;
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		return 1;
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	}
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	if(l->refreshfn == nil){	/* is using backup image; just free it */
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		freememimage(l->save);
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		l->save = nil;
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		l->refreshfn = fn;
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		l->refreshptr = ptr;
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		return 1;
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	}
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	l->save = allocmemimage(i->r, i->chan);
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	if(l->save == nil)
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		return 0;
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	/* easiest way is just to update the entire save area */
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	l->refreshfn(i, i->r, l->refreshptr);
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	l->refreshfn = nil;
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	l->refreshptr = nil;
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	return 1;
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}