Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>

int
memlsetrefresh(Memimage *i, Refreshfn fn, void *ptr)
{
        Memlayer *l;

        l = i->layer;
        if(l->refreshfn!=nil && fn!=nil){       /* just change functions */
                l->refreshfn = fn;
                l->refreshptr = ptr;
                return 1;
        }

        if(l->refreshfn == nil){        /* is using backup image; just free it */
                freememimage(l->save);
                l->save = nil;
                l->refreshfn = fn;
                l->refreshptr = ptr;
                return 1;
        }

        l->save = allocmemimage(i->r, i->chan);
        if(l->save == nil)
                return 0;
        /* easiest way is just to update the entire save area */
        l->refreshfn(i, i->r, l->refreshptr);
        l->refreshfn = nil;
        l->refreshptr = nil;
        return 1;
}