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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>
int
memunload(Memimage *src, Rectangle r, uchar *data, int n)
{
Memimage *tmp;
Memlayer *dl;
Rectangle lr;
int dx;
Top:
dl = src->layer;
if(dl == nil)
return unloadmemimage(src, r, data, n);
/*
* Convert to screen coordinates.
*/
lr = r;
r.min.x += dl->delta.x;
r.min.y += dl->delta.y;
r.max.x += dl->delta.x;
r.max.y += dl->delta.y;
dx = dl->delta.x&(7/src->depth);
if(dl->clear && dx==0){
src = dl->screen->image;
goto Top;
}
/*
* src is an obscured layer or data is unaligned
*/
if(dl->save && dx==0){
if(dl->refreshfn != nil)
return -1; /* can't unload window if it's not Refbackup */
if(n > 0)
memlhide(src, r);
n = unloadmemimage(dl->save, lr, data, n);
return n;
}
tmp = allocmemimage(lr, src->chan);
if(tmp == nil)
return -1;
memdraw(tmp, lr, src, lr.min, nil, lr.min, S);
n = unloadmemimage(tmp, lr, data, n);
freememimage(tmp);
return n;
}
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