diff options
Diffstat (limited to 'src/libdraw/creadimage.c')
-rw-r--r-- | src/libdraw/creadimage.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/libdraw/creadimage.c b/src/libdraw/creadimage.c new file mode 100644 index 00000000..99c42752 --- /dev/null +++ b/src/libdraw/creadimage.c @@ -0,0 +1,113 @@ +#include <u.h> +#include <libc.h> +#include <draw.h> + +Image * +creadimage(Display *d, int fd, int dolock) +{ + char hdr[5*12+1]; + Rectangle r; + int m, nb, miny, maxy, new, ldepth, ncblock; + uchar *buf, *a; + Image *i; + u32int chan; + + if(readn(fd, hdr, 5*12) != 5*12) + return nil; + + /* + * distinguish new channel descriptor from old ldepth. + * channel descriptors have letters as well as numbers, + * while ldepths are a single digit formatted as %-11d. + */ + new = 0; + for(m=0; m<10; m++){ + if(hdr[m] != ' '){ + new = 1; + break; + } + } + if(hdr[11] != ' '){ + werrstr("creadimage: bad format"); + return nil; + } + if(new){ + hdr[11] = '\0'; + if((chan = strtochan(hdr)) == 0){ + werrstr("creadimage: bad channel string %s", hdr); + return nil; + } + }else{ + ldepth = ((int)hdr[10])-'0'; + if(ldepth<0 || ldepth>3){ + werrstr("creadimage: bad ldepth %d", ldepth); + return nil; + } + chan = drawld2chan[ldepth]; + } + r.min.x=atoi(hdr+1*12); + r.min.y=atoi(hdr+2*12); + r.max.x=atoi(hdr+3*12); + r.max.y=atoi(hdr+4*12); + if(r.min.x>r.max.x || r.min.y>r.max.y){ + werrstr("creadimage: bad rectangle"); + return nil; + } + + if(dolock) + lockdisplay(d); + i = allocimage(d, r, chan, 0, 0); + if(dolock) + unlockdisplay(d); + if(i == nil) + return nil; + ncblock = _compblocksize(r, i->depth); + buf = malloc(ncblock); + if(buf == nil) + goto Errout; + miny = r.min.y; + while(miny != r.max.y){ + if(readn(fd, hdr, 2*12) != 2*12){ + Errout: + if(dolock) + lockdisplay(d); + Erroutlock: + freeimage(i); + if(dolock) + unlockdisplay(d); + free(buf); + return nil; + } + maxy = atoi(hdr+0*12); + nb = atoi(hdr+1*12); + if(maxy<=miny || r.max.y<maxy){ + werrstr("creadimage: bad maxy %d", maxy); + goto Errout; + } + if(nb<=0 || ncblock<nb){ + werrstr("creadimage: bad count %d", nb); + goto Errout; + } + if(readn(fd, buf, nb)!=nb) + goto Errout; + if(dolock) + lockdisplay(d); + a = bufimage(i->display, 21+nb); + if(a == nil) + goto Erroutlock; + a[0] = 'Y'; + BPLONG(a+1, i->id); + BPLONG(a+5, r.min.x); + BPLONG(a+9, miny); + BPLONG(a+13, r.max.x); + BPLONG(a+17, maxy); + if(!new) /* old image: flip the data bits */ + _twiddlecompressed(buf, nb); + memmove(a+21, buf, nb); + if(dolock) + unlockdisplay(d); + miny = maxy; + } + free(buf); + return i; +} |