| rsc | 76193d7 | 2003-09-30 17:47:42 +0000 | [diff] [blame] | 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | #include <draw.h> |
| 4 | |
| 5 | Image* |
| 6 | readimage(Display *d, int fd, int dolock) |
| 7 | { |
| 8 | char hdr[5*12+1]; |
| 9 | int dy; |
| 10 | int new; |
| 11 | uint l, n; |
| 12 | int m, j, chunk; |
| 13 | int miny, maxy; |
| 14 | Rectangle r; |
| 15 | int ldepth; |
| 16 | u32int chan; |
| 17 | uchar *tmp; |
| 18 | Image *i; |
| 19 | |
| 20 | if(readn(fd, hdr, 11) != 11) |
| 21 | return nil; |
| 22 | if(memcmp(hdr, "compressed\n", 11) == 0) |
| 23 | return creadimage(d, fd, dolock); |
| 24 | if(readn(fd, hdr+11, 5*12-11) != 5*12-11) |
| 25 | return nil; |
| rsc | 4e20688 | 2004-04-25 20:26:27 +0000 | [diff] [blame] | 26 | if(d) |
| 27 | chunk = d->bufsize - 32; /* a little room for header */ |
| 28 | else |
| 29 | chunk = 8192; |
| rsc | 76193d7 | 2003-09-30 17:47:42 +0000 | [diff] [blame] | 30 | |
| 31 | /* |
| 32 | * distinguish new channel descriptor from old ldepth. |
| 33 | * channel descriptors have letters as well as numbers, |
| 34 | * while ldepths are a single digit formatted as %-11d. |
| 35 | */ |
| 36 | new = 0; |
| 37 | for(m=0; m<10; m++){ |
| 38 | if(hdr[m] != ' '){ |
| 39 | new = 1; |
| 40 | break; |
| 41 | } |
| 42 | } |
| 43 | if(hdr[11] != ' '){ |
| 44 | werrstr("readimage: bad format"); |
| 45 | return nil; |
| 46 | } |
| 47 | if(new){ |
| 48 | hdr[11] = '\0'; |
| 49 | if((chan = strtochan(hdr)) == 0){ |
| 50 | werrstr("readimage: bad channel string %s", hdr); |
| 51 | return nil; |
| 52 | } |
| 53 | }else{ |
| 54 | ldepth = ((int)hdr[10])-'0'; |
| 55 | if(ldepth<0 || ldepth>3){ |
| 56 | werrstr("readimage: bad ldepth %d", ldepth); |
| 57 | return nil; |
| 58 | } |
| 59 | chan = drawld2chan[ldepth]; |
| 60 | } |
| 61 | |
| 62 | r.min.x = atoi(hdr+1*12); |
| 63 | r.min.y = atoi(hdr+2*12); |
| 64 | r.max.x = atoi(hdr+3*12); |
| 65 | r.max.y = atoi(hdr+4*12); |
| 66 | if(r.min.x>r.max.x || r.min.y>r.max.y){ |
| 67 | werrstr("readimage: bad rectangle"); |
| 68 | return nil; |
| 69 | } |
| 70 | |
| 71 | miny = r.min.y; |
| 72 | maxy = r.max.y; |
| 73 | |
| 74 | l = bytesperline(r, chantodepth(chan)); |
| rsc | 4e20688 | 2004-04-25 20:26:27 +0000 | [diff] [blame] | 75 | if(d){ |
| 76 | if(dolock) |
| 77 | lockdisplay(d); |
| 78 | i = allocimage(d, r, chan, 0, -1); |
| 79 | if(dolock) |
| 80 | unlockdisplay(d); |
| 81 | if(i == nil) |
| 82 | return nil; |
| 83 | }else{ |
| 84 | i = mallocz(sizeof(Image), 1); |
| 85 | if(i == nil) |
| 86 | return nil; |
| 87 | } |
| 88 | |
| rsc | 76193d7 | 2003-09-30 17:47:42 +0000 | [diff] [blame] | 89 | tmp = malloc(chunk); |
| 90 | if(tmp == nil) |
| 91 | goto Err; |
| 92 | while(maxy > miny){ |
| 93 | dy = maxy - miny; |
| 94 | if(dy*l > chunk) |
| 95 | dy = chunk/l; |
| 96 | if(dy <= 0){ |
| 97 | werrstr("readimage: image too wide for buffer"); |
| 98 | goto Err; |
| 99 | } |
| 100 | n = dy*l; |
| 101 | m = readn(fd, tmp, n); |
| 102 | if(m != n){ |
| 103 | werrstr("readimage: read count %d not %d: %r", m, n); |
| 104 | Err: |
| 105 | if(dolock) |
| 106 | lockdisplay(d); |
| 107 | Err1: |
| 108 | freeimage(i); |
| 109 | if(dolock) |
| 110 | unlockdisplay(d); |
| 111 | free(tmp); |
| 112 | return nil; |
| 113 | } |
| 114 | if(!new) /* an old image: must flip all the bits */ |
| 115 | for(j=0; j<chunk; j++) |
| 116 | tmp[j] ^= 0xFF; |
| 117 | |
| rsc | 4e20688 | 2004-04-25 20:26:27 +0000 | [diff] [blame] | 118 | if(d){ |
| 119 | if(dolock) |
| 120 | lockdisplay(d); |
| 121 | if(loadimage(i, Rect(r.min.x, miny, r.max.x, miny+dy), tmp, chunk) <= 0) |
| 122 | goto Err1; |
| 123 | if(dolock) |
| 124 | unlockdisplay(d); |
| 125 | } |
| rsc | 76193d7 | 2003-09-30 17:47:42 +0000 | [diff] [blame] | 126 | miny += dy; |
| 127 | } |
| 128 | free(tmp); |
| 129 | return i; |
| 130 | } |
