45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.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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}
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