1 76193d7c 2003-09-30 devnull #include <u.h>
2 76193d7c 2003-09-30 devnull #include <libc.h>
3 76193d7c 2003-09-30 devnull #include <draw.h>
6 76193d7c 2003-09-30 devnull creadimage(Display *d, int fd, int dolock)
8 76193d7c 2003-09-30 devnull char hdr[5*12+1];
9 76193d7c 2003-09-30 devnull Rectangle r;
10 76193d7c 2003-09-30 devnull int m, nb, miny, maxy, new, ldepth, ncblock;
11 76193d7c 2003-09-30 devnull uchar *buf, *a;
12 76193d7c 2003-09-30 devnull Image *i;
13 76193d7c 2003-09-30 devnull u32int chan;
15 76193d7c 2003-09-30 devnull if(readn(fd, hdr, 5*12) != 5*12)
16 76193d7c 2003-09-30 devnull return nil;
19 76193d7c 2003-09-30 devnull * distinguish new channel descriptor from old ldepth.
20 76193d7c 2003-09-30 devnull * channel descriptors have letters as well as numbers,
21 76193d7c 2003-09-30 devnull * while ldepths are a single digit formatted as %-11d.
24 76193d7c 2003-09-30 devnull for(m=0; m<10; m++){
25 76193d7c 2003-09-30 devnull if(hdr[m] != ' '){
30 76193d7c 2003-09-30 devnull if(hdr[11] != ' '){
31 76193d7c 2003-09-30 devnull werrstr("creadimage: bad format");
32 76193d7c 2003-09-30 devnull return nil;
35 76193d7c 2003-09-30 devnull hdr[11] = '\0';
36 76193d7c 2003-09-30 devnull if((chan = strtochan(hdr)) == 0){
37 76193d7c 2003-09-30 devnull werrstr("creadimage: bad channel string %s", hdr);
38 76193d7c 2003-09-30 devnull return nil;
41 76193d7c 2003-09-30 devnull ldepth = ((int)hdr[10])-'0';
42 76193d7c 2003-09-30 devnull if(ldepth<0 || ldepth>3){
43 76193d7c 2003-09-30 devnull werrstr("creadimage: bad ldepth %d", ldepth);
44 76193d7c 2003-09-30 devnull return nil;
46 76193d7c 2003-09-30 devnull chan = drawld2chan[ldepth];
48 76193d7c 2003-09-30 devnull r.min.x=atoi(hdr+1*12);
49 76193d7c 2003-09-30 devnull r.min.y=atoi(hdr+2*12);
50 76193d7c 2003-09-30 devnull r.max.x=atoi(hdr+3*12);
51 76193d7c 2003-09-30 devnull r.max.y=atoi(hdr+4*12);
52 76193d7c 2003-09-30 devnull if(r.min.x>r.max.x || r.min.y>r.max.y){
53 76193d7c 2003-09-30 devnull werrstr("creadimage: bad rectangle");
54 76193d7c 2003-09-30 devnull return nil;
57 76193d7c 2003-09-30 devnull if(dolock)
58 76193d7c 2003-09-30 devnull lockdisplay(d);
59 76193d7c 2003-09-30 devnull i = allocimage(d, r, chan, 0, 0);
60 76193d7c 2003-09-30 devnull if(dolock)
61 76193d7c 2003-09-30 devnull unlockdisplay(d);
62 76193d7c 2003-09-30 devnull if(i == nil)
63 76193d7c 2003-09-30 devnull return nil;
64 76193d7c 2003-09-30 devnull ncblock = _compblocksize(r, i->depth);
65 76193d7c 2003-09-30 devnull buf = malloc(ncblock);
66 76193d7c 2003-09-30 devnull if(buf == nil)
67 76193d7c 2003-09-30 devnull goto Errout;
68 76193d7c 2003-09-30 devnull miny = r.min.y;
69 76193d7c 2003-09-30 devnull while(miny != r.max.y){
70 76193d7c 2003-09-30 devnull if(readn(fd, hdr, 2*12) != 2*12){
72 76193d7c 2003-09-30 devnull if(dolock)
73 76193d7c 2003-09-30 devnull lockdisplay(d);
74 76193d7c 2003-09-30 devnull Erroutlock:
75 76193d7c 2003-09-30 devnull freeimage(i);
76 76193d7c 2003-09-30 devnull if(dolock)
77 76193d7c 2003-09-30 devnull unlockdisplay(d);
78 76193d7c 2003-09-30 devnull free(buf);
79 76193d7c 2003-09-30 devnull return nil;
81 76193d7c 2003-09-30 devnull maxy = atoi(hdr+0*12);
82 76193d7c 2003-09-30 devnull nb = atoi(hdr+1*12);
83 76193d7c 2003-09-30 devnull if(maxy<=miny || r.max.y<maxy){
84 76193d7c 2003-09-30 devnull werrstr("creadimage: bad maxy %d", maxy);
85 76193d7c 2003-09-30 devnull goto Errout;
87 76193d7c 2003-09-30 devnull if(nb<=0 || ncblock<nb){
88 76193d7c 2003-09-30 devnull werrstr("creadimage: bad count %d", nb);
89 76193d7c 2003-09-30 devnull goto Errout;
91 76193d7c 2003-09-30 devnull if(readn(fd, buf, nb)!=nb)
92 76193d7c 2003-09-30 devnull goto Errout;
93 76193d7c 2003-09-30 devnull if(dolock)
94 76193d7c 2003-09-30 devnull lockdisplay(d);
95 76193d7c 2003-09-30 devnull a = bufimage(i->display, 21+nb);
96 76193d7c 2003-09-30 devnull if(a == nil)
97 76193d7c 2003-09-30 devnull goto Erroutlock;
98 76193d7c 2003-09-30 devnull a[0] = 'Y';
99 76193d7c 2003-09-30 devnull BPLONG(a+1, i->id);
100 76193d7c 2003-09-30 devnull BPLONG(a+5, r.min.x);
101 76193d7c 2003-09-30 devnull BPLONG(a+9, miny);
102 76193d7c 2003-09-30 devnull BPLONG(a+13, r.max.x);
103 76193d7c 2003-09-30 devnull BPLONG(a+17, maxy);
104 76193d7c 2003-09-30 devnull if(!new) /* old image: flip the data bits */
105 76193d7c 2003-09-30 devnull _twiddlecompressed(buf, nb);
106 76193d7c 2003-09-30 devnull memmove(a+21, buf, nb);
107 76193d7c 2003-09-30 devnull if(dolock)
108 76193d7c 2003-09-30 devnull unlockdisplay(d);
109 76193d7c 2003-09-30 devnull miny = maxy;
111 76193d7c 2003-09-30 devnull free(buf);
112 76193d7c 2003-09-30 devnull return i;
