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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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