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#ifndef lint |
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static const char RCSid[] = "$Id: normcodec.c,v 2.4 2019/08/26 23:33:24 greg Exp $"; |
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#endif |
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/* |
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* Routines to encode/decode 32-bit normals |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "rtio.h" |
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#include "rtmath.h" |
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#include "normcodec.h" |
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|
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|
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/* Set codec defaults */ |
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void |
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set_nc_defaults(NORMCODEC *ncp) |
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{ |
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memset(ncp, 0, sizeof(NORMCODEC)); |
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ncp->finp = stdin; |
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ncp->inpname = "<stdin>"; |
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ncp->format = 'a'; |
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ncp->res.rt = PIXSTANDARD; |
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if (!progname) progname = "norm_codec"; |
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} |
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|
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|
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/* process header line */ |
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static int |
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headline(char *s, void *p) |
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{ |
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NORMCODEC *ncp = (NORMCODEC *)p; |
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int rv; |
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|
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if (formatval(ncp->inpfmt, s)) /* don't pass format */ |
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return 0; |
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|
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if ((rv = isbigendian(s)) >= 0) { |
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ncp->swapped = (nativebigendian() != rv); |
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return 0; |
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} |
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if (ncp->hdrflags & HF_HEADOUT) |
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fputs(s, stdout); /* copy to standard output */ |
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return 1; |
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} |
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|
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|
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/* Load/copy header */ |
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int |
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process_nc_header(NORMCODEC *ncp, int ac, char *av[]) |
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{ |
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if (ncp->hdrflags & HF_HEADIN && |
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getheader(ncp->finp, headline, ncp) < 0) { |
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if (ncp->hdrflags & HF_STDERR) { |
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fputs(ncp->inpname, stderr); |
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fputs(": bad header\n", stderr); |
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} |
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return 0; |
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} |
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if (ncp->hdrflags & HF_HEADOUT) { /* finish header */ |
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if (!(ncp->hdrflags & HF_HEADIN)) |
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newheader("RADIANCE", stdout); |
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if (ac > 0) |
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printargs(ac, av, stdout); |
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if (ncp->hdrflags & HF_ENCODE) { |
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fputformat(NORMAL32FMT, stdout); |
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} else |
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switch (ncp->format) { |
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case 'a': |
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fputformat("ascii", stdout); |
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break; |
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case 'f': |
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fputendian(stdout); |
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fputformat("float", stdout); |
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break; |
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case 'd': |
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fputendian(stdout); |
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fputformat("double", stdout); |
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break; |
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} |
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fputc('\n', stdout); |
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} |
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/* get/put resolution string */ |
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if (ncp->hdrflags & HF_RESIN && !fgetsresolu(&ncp->res, ncp->finp)) { |
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if (ncp->hdrflags & HF_STDERR) { |
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fputs(ncp->inpname, stderr); |
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fputs(": bad resolution string\n", stderr); |
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} |
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return 0; |
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} |
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if (ncp->hdrflags & HF_RESOUT) |
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fputsresolu(&ncp->res, stdout); |
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|
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ncp->dstart = ncp->curpos = ftell(ncp->finp); |
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return 1; |
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} |
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|
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|
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/* Check that we have what we need to decode normals */ |
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int |
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check_decode_normals(NORMCODEC *ncp) |
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{ |
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if (ncp->hdrflags & HF_ENCODE) { |
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if (ncp->hdrflags & HF_STDERR) { |
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fputs(progname, stderr); |
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fputs(": wrong header mode for decode\n", stderr); |
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} |
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return 0; |
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} |
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if (ncp->inpfmt[0] && strcmp(ncp->inpfmt, NORMAL32FMT)) { |
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if (ncp->hdrflags & HF_STDERR) { |
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fputs(ncp->inpname, stderr); |
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fputs(": unexpected input format: ", stderr); |
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fputs(ncp->inpfmt, stderr); |
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fputc('\n', stderr); |
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} |
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return 0; |
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} |
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return 1; |
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} |
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|
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|
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/* Decode next normal from input */ |
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int |
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decode_normal_next(FVECT nrm, NORMCODEC *ncp) |
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{ |
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static int32 lastc; |
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static FVECT lastv; |
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int32 c = getint(4, ncp->finp); |
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|
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if (c == EOF && feof(ncp->finp)) |
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return -1; |
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|
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ncp->curpos += 4; |
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|
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if (c == lastc) { /* optimization */ |
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VCOPY(nrm, lastv); |
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} else { |
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decodedir(nrm, c); |
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if (c) { |
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lastc = c; |
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VCOPY(lastv, nrm); |
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} |
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} |
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return (c != 0); |
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} |
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|
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|
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/* Seek to the indicated pixel position */ |
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int |
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seek_nc_pix(NORMCODEC *ncp, int x, int y) |
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{ |
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long seekpos; |
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|
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if ((ncp->res.xr <= 0) | (ncp->res.yr <= 0)) { |
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if (ncp->hdrflags & HF_STDERR) { |
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fputs(progname, stderr); |
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fputs(": need map resolution to seek\n", stderr); |
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} |
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return -1; |
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} |
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if ((x < 0) | (y < 0) || |
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(x >= scanlen(&ncp->res)) | (y >= numscans(&ncp->res))) { |
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if (ncp->hdrflags & HF_STDERR) { |
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fputs(ncp->inpname, stderr); |
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fputs(": warning - pixel index off map\n", stderr); |
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} |
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return 0; |
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} |
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seekpos = ncp->dstart + 4*((long)y*scanlen(&ncp->res) + x); |
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|
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if (seekpos != ncp->curpos && |
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fseek(ncp->finp, seekpos, SEEK_SET) == EOF) { |
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if (ncp->hdrflags & HF_STDERR) { |
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fputs(ncp->inpname, stderr); |
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fputs(": seek error\n", stderr); |
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} |
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return -1; |
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} |
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ncp->curpos = seekpos; |
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return 1; |
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} |
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|
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|
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/* Read and decode normal for the given pixel */ |
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int |
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decode_normal_pix(FVECT nrm, NORMCODEC *ncp, int x, int y) |
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{ |
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int rval = seek_nc_pix(ncp, x, y); |
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|
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if (rval < 0) |
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return -1; |
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|
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if (!rval) { |
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nrm[0] = nrm[1] = nrm[2] = .0; |
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return 0; |
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} |
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return decode_normal_next(nrm, ncp); |
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} |
