1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <memdraw.h>
5 #include <memlayer.h>
6
7 int
memunload(Memimage * src,Rectangle r,uchar * data,int n)8 memunload(Memimage *src, Rectangle r, uchar *data, int n)
9 {
10 Memimage *tmp;
11 Memlayer *dl;
12 Rectangle lr;
13 int dx;
14
15 Top:
16 dl = src->layer;
17 if(dl == nil)
18 return unloadmemimage(src, r, data, n);
19
20 /*
21 * Convert to screen coordinates.
22 */
23 lr = r;
24 r.min.x += dl->delta.x;
25 r.min.y += dl->delta.y;
26 r.max.x += dl->delta.x;
27 r.max.y += dl->delta.y;
28 dx = dl->delta.x&(7/src->depth);
29 if(dl->clear && dx==0){
30 src = dl->screen->image;
31 goto Top;
32 }
33
34 /*
35 * src is an obscured layer or data is unaligned
36 */
37 if(dl->save && dx==0){
38 if(dl->refreshfn != 0)
39 return -1; /* can't unload window if it's not Refbackup */
40 if(n > 0)
41 memlhide(src, r);
42 n = unloadmemimage(dl->save, lr, data, n);
43 return n;
44 }
45 tmp = allocmemimage(lr, src->chan);
46 if(tmp == nil)
47 return -1;
48 memdraw(tmp, lr, src, lr.min, nil, lr.min, S);
49 n = unloadmemimage(tmp, lr, data, n);
50 freememimage(tmp);
51 return n;
52 }
53