1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 
5 int
6 loadimage(Image *i, Rectangle r, uchar *data, int ndata)
7 {
8 	long dy;
9 	int n, bpl;
10 	uchar *a;
11 	int chunk;
12 
13 	chunk = i->display->bufsize - 64;
14 
15 	if(!rectinrect(r, i->r)){
16 		werrstr("loadimage: bad rectangle");
17 		return -1;
18 	}
19 	bpl = bytesperline(r, i->depth);
20 	n = bpl*Dy(r);
21 	if(n > ndata){
22 		werrstr("loadimage: insufficient data");
23 		return -1;
24 	}
25 	ndata = 0;
26 	while(r.max.y > r.min.y){
27 		dy = r.max.y - r.min.y;
28 		if(dy*bpl > chunk)
29 			dy = chunk/bpl;
30 		if(dy <= 0){
31 			werrstr("loadimage: image too wide for buffer");
32 			return -1;
33 		}
34 		n = dy*bpl;
35 		a = bufimage(i->display, 21+n);
36 		if(a == nil){
37 			werrstr("bufimage failed");
38 			return -1;
39 		}
40 		a[0] = 'y';
41 		BPLONG(a+1, i->id);
42 		BPLONG(a+5, r.min.x);
43 		BPLONG(a+9, r.min.y);
44 		BPLONG(a+13, r.max.x);
45 		BPLONG(a+17, r.min.y+dy);
46 		memmove(a+21, data, n);
47 		ndata += n;
48 		data += n;
49 		r.min.y += dy;
50 	}
51 	if(flushimage(i->display, 0) < 0)
52 		return -1;
53 	return ndata;
54 }