ref: 6dce09cec3bf6a689fa9a3f838df67d7d48d9d1a
dir: /libdraw/creadimage.c/
#include "lib9.h" #include "draw.h" #include "kernel.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; u32 chan; int font; font = dolock&2; dolock &= 1; if(libreadn(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] != ' '){ kwerrstr("creadimage: bad format"); return nil; } if(new){ hdr[11] = '\0'; if((chan = strtochan(hdr)) == 0){ kwerrstr("creadimage: bad channel string %s", hdr); return nil; } }else{ ldepth = ((int)hdr[10])-'0'; if(ldepth<0 || ldepth>3){ kwerrstr("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){ kwerrstr("creadimage: bad rectangle"); return nil; } if(dolock) 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(libreadn(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){ kwerrstr("creadimage: bad maxy %d", maxy); goto Errout; } if(nb<=0 || ncblock<nb){ kwerrstr("creadimage: bad count %d", nb); goto Errout; } if(libreadn(fd, buf, nb)!=nb) goto Errout; if(dolock) lockdisplay(d); a = bufimage(i->display, 21+nb); if(a == nil) goto Erroutlock; a[0] = 'Y'; BP32INT(a+1, i->id); BP32INT(a+5, r.min.x); BP32INT(a+9, miny); BP32INT(a+13, r.max.x); BP32INT(a+17, maxy); if(!font&&!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; }