1 #include "lib9.h"
2 #include "draw.h"
3 #include "kernel.h"
4
5 int
loadimage(Image * i,Rectangle r,uchar * data,int ndata)6 loadimage(Image *i, Rectangle r, uchar *data, int ndata)
7 {
8 long dy;
9 int n, bpl, roff, dstroff, lskip, llen, y;
10 uchar *a;
11 int chunk;
12 Rectangle dstr;
13
14 chunk = i->display->bufsize - 64;
15
16 bpl = bytesperline(r, i->depth);
17 n = bpl*Dy(r);
18 if(n > ndata){
19 kwerrstr("loadimage: insufficient data");
20 return -1;
21 }
22
23 dstr = r;
24 rectclip(&dstr, i->r);
25 rectclip(&dstr, i->clipr);
26
27 if (!rectinrect(dstr, i->r))
28 return 0;
29
30 roff = (r.min.x*i->depth)>>3;
31 dstroff = dstr.min.x * i->depth >> 3;
32 lskip = dstroff - roff;
33 llen = (dstr.max.x*i->depth + 7 >> 3) - dstroff;
34 data += (dstr.min.y - r.min.y) * bpl + lskip;
35
36 ndata = 0;
37 while(dstr.max.y > dstr.min.y){
38 dy = dstr.max.y - dstr.min.y;
39 if(dy*llen > chunk)
40 dy = chunk/llen;
41 if(dy <= 0){
42 kwerrstr("loadimage: image too wide for buffer");
43 return -1;
44 }
45 n = dy*llen;
46 a = bufimage(i->display, 21+n);
47 if(a == nil){
48 kwerrstr("bufimage failed");
49 return -1;
50 }
51 a[0] = 'y';
52 BPLONG(a+1, i->id);
53 BPLONG(a+5, dstr.min.x);
54 BPLONG(a+9, dstr.min.y);
55 BPLONG(a+13, dstr.max.x);
56 BPLONG(a+17, dstr.min.y+dy);
57 a += 21;
58 for (y = 0; y < dy; y++) {
59 memmove(a, data, llen);
60 a += llen;
61 ndata += llen;
62 data += bpl;
63 }
64 dstr.min.y += dy;
65 }
66 if(flushimage(i->display, 0) < 0)
67 return -1;
68 return ndata;
69 }
70
71