1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <memdraw.h>
5 #include <memlayer.h>
6
7 int
memload(Memimage * dst,Rectangle r,uchar * data,int n,int iscompressed)8 memload(Memimage *dst, Rectangle r, uchar *data, int n, int iscompressed)
9 {
10 int (*loadfn)(Memimage*, Rectangle, uchar*, int);
11 Memimage *tmp;
12 Memlayer *dl;
13 Rectangle lr;
14 int dx;
15
16 loadfn = loadmemimage;
17 if(iscompressed)
18 loadfn = cloadmemimage;
19
20 Top:
21 dl = dst->layer;
22 if(dl == nil)
23 return loadfn(dst, r, data, n);
24
25 /*
26 * Convert to screen coordinates.
27 */
28 lr = r;
29 r.min.x += dl->delta.x;
30 r.min.y += dl->delta.y;
31 r.max.x += dl->delta.x;
32 r.max.y += dl->delta.y;
33 dx = dl->delta.x&(7/dst->depth);
34 if(dl->clear && dx==0){
35 dst = dl->screen->image;
36 goto Top;
37 }
38
39 /*
40 * dst is an obscured layer or data is unaligned
41 */
42 if(dl->save && dx==0){
43 n = loadfn(dl->save, lr, data, n);
44 if(n > 0)
45 memlexpose(dst, r);
46 return n;
47 }
48 tmp = allocmemimage(lr, dst->chan);
49 if(tmp == nil)
50 return -1;
51 n = loadfn(tmp, lr, data, n);
52 memdraw(dst, lr, tmp, lr.min, nil, lr.min, S);
53 freememimage(tmp);
54 return n;
55 }
56