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#ifndef lint |
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static const char RCSid[] = "$Id: depthcodec.c,v 2.1 2019/07/18 18:51:56 greg Exp $"; |
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#endif |
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/* |
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* Routines to encode/decoded 16-bit depths |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <stdlib.h> |
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#include <string.h> |
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#include <math.h> |
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#include <ctype.h> |
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#include "rtio.h" |
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#include "fvect.h" |
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#include "depthcodec.h" |
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|
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char *progname = "depth_codec"; |
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|
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|
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#if 0 /* defined as macro in depthcodec.h */ |
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/* Encode depth as 16-bit signed integer */ |
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int |
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depth2code(double d, double dref) |
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{ |
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if (d <= .0) |
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return -32768; |
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|
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if (d > dref) |
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return (int)(32768 - 32768*dref/d) - 1; |
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|
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return (int)(32767*d/dref - 32768); |
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} |
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#endif |
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|
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|
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/* Decode depth from 16-bit signed integer */ |
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double |
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code2depth(int c, double dref) |
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{ |
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if (c <= -32768) |
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return .0; |
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|
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if (c >= 32767) |
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return FHUGE; |
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|
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if (c < 0) |
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return dref*(32767.5 + c)*(1./32767.); |
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|
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return dref*32768./(32766.5 - c); |
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} |
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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_dc_defaults(DEPTHCODEC *dcp) |
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{ |
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memset(dcp, 0, sizeof(DEPTHCODEC)); |
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dcp->finp = stdin; |
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dcp->inpname = "<stdin>"; |
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dcp->format = 'a'; |
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dcp->refdepth = 1.; |
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dcp->depth_unit[0] = '1'; |
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dcp->vw = stdview; |
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dcp->res.rt = PIXSTANDARD; |
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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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DEPTHCODEC *dcp = (DEPTHCODEC *)p; |
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|
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if (formatval(dcp->inpfmt, s)) /* don't pass format */ |
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return 0; |
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/* check for reference depth */ |
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if (!strncmp(s, DEPTHSTR, LDEPTHSTR)) { |
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char *cp; |
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strlcpy(dcp->depth_unit, s+LDEPTHSTR, sizeof(dcp->depth_unit)); |
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cp = dcp->depth_unit; |
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while (*cp) cp++; |
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while (cp > dcp->depth_unit && isspace(cp[-1])) cp--; |
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*cp = '\0'; |
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dcp->refdepth = atof(dcp->depth_unit); |
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if (dcp->refdepth <= .0) { |
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fputs(dcp->inpname, stderr); |
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fputs(": bad reference depth in input header\n", stderr); |
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return -1; |
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} |
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} else if (isview(s)) /* get view params */ |
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dcp->gotview += (sscanview(&dcp->vw, s) > 0); |
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if (dcp->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_dc_header(DEPTHCODEC *dcp, int ac, char *av[]) |
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{ |
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if (dcp->hdrflags & HF_HEADIN && |
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getheader(dcp->finp, headline, dcp) < 0) { |
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fputs(dcp->inpname, stderr); |
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fputs(": bad header\n", stderr); |
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return 1; |
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} |
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if (dcp->hdrflags & HF_HEADOUT) { /* finish header */ |
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if (!(dcp->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 (dcp->hdrflags & HF_ENCODE) { |
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fputs(DEPTHSTR, stdout); |
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fputs(dcp->depth_unit, stdout); |
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fputc('\n', stdout); |
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fputformat(DEPTH16FMT, stdout); |
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} else |
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switch (dcp->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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fputformat("float", stdout); |
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break; |
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case 'd': |
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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 (dcp->hdrflags & HF_RESIN && !fgetsresolu(&dcp->res, dcp->finp)) { |
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fputs(dcp->inpname, stderr); |
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fputs(": bad resolution string\n", stderr); |
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return 1; |
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} |
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if (dcp->hdrflags & HF_RESOUT) |
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fputsresolu(&dcp->res, stdout); |
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|
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dcp->dstart = dcp->curpos = ftell(dcp->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 depths */ |
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int |
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check_decode_depths(DEPTHCODEC *dcp) |
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{ |
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if (dcp->hdrflags & HF_ENCODE) { |
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fputs(progname, stderr); |
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fputs(": wrong header mode for decode\n", stderr); |
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return 0; |
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} |
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if (dcp->inpfmt[0] && strcmp(dcp->inpfmt, DEPTH16FMT)) { |
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fputs(dcp->inpname, stderr); |
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fputs(": unexpected input format: ", stderr); |
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fputs(dcp->inpfmt, stderr); |
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fputc('\n', stderr); |
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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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/* Check that we have what we need to decode world positions */ |
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int |
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check_decode_worldpos(DEPTHCODEC *dcp) |
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{ |
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char *err; |
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|
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if (!check_decode_depths(dcp)) |
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return 0; |
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if ((dcp->res.xr <= 0) | (dcp->res.yr <= 0)) { |
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fputs(progname, stderr); |
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fputs(": missing image resolution\n", stderr); |
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return 0; |
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} |
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if (!dcp->gotview) { |
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fputs(dcp->inpname, stderr); |
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fputs(": missing view\n", stderr); |
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return 0; |
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} |
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if ((err = setview(&dcp->vw)) != NULL) { |
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fputs(dcp->inpname, stderr); |
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fputs(": input view error: ", stderr); |
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fputs(err, stderr); |
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fputc('\n', stderr); |
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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 depth pixel */ |
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double |
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decode_depth_next(DEPTHCODEC *dcp) |
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{ |
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int c = getint(2, dcp->finp); |
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|
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if (c == EOF && feof(dcp->finp)) |
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return -1.; |
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|
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dcp->curpos += 2; |
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|
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return code2depth(c, dcp->refdepth); |
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} |
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|
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|
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/* Compute world position from depth */ |
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int |
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compute_worldpos(FVECT wpos, DEPTHCODEC *dcp, int x, int y, double d) |
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{ |
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RREAL loc[2]; |
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FVECT rdir; |
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|
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pix2loc(loc, &dcp->res, x, y); |
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|
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if (viewray(wpos, rdir, &dcp->vw, loc[0], loc[1]) < -FTINY) { |
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VCOPY(wpos, dcp->vw.vp); |
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return 0; |
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} |
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VSUM(wpos, wpos, rdir, d); |
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return 1; |
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} |
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|
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|
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/* Decode the next world position */ |
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int |
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decode_worldpos_next(FVECT wpos, DEPTHCODEC *dcp) |
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{ |
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const long n = (dcp->curpos - dcp->dstart)>>1; |
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int x, y; |
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double d; |
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|
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d = decode_depth_next(dcp); |
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if (d < -FTINY) |
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return -1; |
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|
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x = scanlen(&dcp->res); |
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y = n / x; |
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x = n - (long)y*x; |
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|
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return compute_worldpos(wpos, dcp, x, y, d); |
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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_dc_pix(DEPTHCODEC *dcp, int x, int y) |
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{ |
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long seekpos; |
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|
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if ((dcp->res.xr <= 0) | (dcp->res.yr <= 0)) { |
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fputs(progname, stderr); |
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fputs(": need image resolution to seek\n", stderr); |
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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(&dcp->res)) | (y >= numscans(&dcp->res))) { |
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fputs(dcp->inpname, stderr); |
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fputs(": warning - pixel index off image\n", stderr); |
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return 0; |
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} |
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seekpos = dcp->dstart + 2*((long)y*scanlen(&dcp->res) + x); |
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if (seekpos != dcp->curpos && |
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fseek(dcp->finp, seekpos, SEEK_SET) == EOF) { |
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fputs(dcp->inpname, stderr); |
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fputs(": seek error\n", stderr); |
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return -1; |
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} |
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dcp->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 depth for the given pixel */ |
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double |
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decode_depth_pix(DEPTHCODEC *dcp, int x, int y) |
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{ |
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int rval = seek_dc_pix(dcp, x, y); |
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|
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if (rval < 0) |
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return -1.; |
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if (!rval) |
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return .0; |
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|
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return decode_depth_next(dcp); |
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} |
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|
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|
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/* Read and decode the world position at the given pixel */ |
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int |
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get_worldpos_pix(FVECT wpos, DEPTHCODEC *dcp, int x, int y) |
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{ |
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double d = decode_depth_pix(dcp, x, y); |
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|
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if (d < -FTINY) |
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return -1; |
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|
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return compute_worldpos(wpos, dcp, x, y, d); |
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} |
