| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: depthcodec.c,v 2.4 2019/08/14 21:00:14 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines to encode/decoded 16-bit depths |
| 6 |
*/ |
| 7 |
|
| 8 |
#include "copyright.h" |
| 9 |
|
| 10 |
#include <stdlib.h> |
| 11 |
#include <math.h> |
| 12 |
#include <ctype.h> |
| 13 |
#include "rtio.h" |
| 14 |
#include "fvect.h" |
| 15 |
#include "depthcodec.h" |
| 16 |
|
| 17 |
|
| 18 |
#ifndef depth2code |
| 19 |
/* Encode depth as 16-bit signed integer */ |
| 20 |
int |
| 21 |
depth2code(double d, double dref) |
| 22 |
{ |
| 23 |
if (d <= .0) |
| 24 |
return -32768; |
| 25 |
|
| 26 |
if (d > dref) |
| 27 |
return (int)(32768.001 - 32768.*dref/d) - 1; |
| 28 |
|
| 29 |
return (int)(32767.*d/dref - 32768.); |
| 30 |
} |
| 31 |
#endif |
| 32 |
|
| 33 |
|
| 34 |
#ifndef code2depth |
| 35 |
/* Decode depth from 16-bit signed integer */ |
| 36 |
double |
| 37 |
code2depth(int c, double dref) |
| 38 |
{ |
| 39 |
if (c <= -32768) |
| 40 |
return .0; |
| 41 |
|
| 42 |
if (c >= 32767) |
| 43 |
return FHUGE; |
| 44 |
|
| 45 |
if (c >= 0) |
| 46 |
return dref*32768./(32766.5 - c); |
| 47 |
|
| 48 |
return dref*(32767.5 + c)*(1./32767.); |
| 49 |
} |
| 50 |
#endif |
| 51 |
|
| 52 |
|
| 53 |
/* Set codec defaults */ |
| 54 |
void |
| 55 |
set_dc_defaults(DEPTHCODEC *dcp) |
| 56 |
{ |
| 57 |
memset(dcp, 0, sizeof(DEPTHCODEC)); |
| 58 |
dcp->finp = stdin; |
| 59 |
dcp->inpname = "<stdin>"; |
| 60 |
dcp->format = 'a'; |
| 61 |
dcp->refdepth = 1.; |
| 62 |
dcp->depth_unit[0] = '1'; |
| 63 |
dcp->vw = stdview; |
| 64 |
dcp->res.rt = PIXSTANDARD; |
| 65 |
if (!progname) progname = "depth_codec"; |
| 66 |
} |
| 67 |
|
| 68 |
|
| 69 |
/* process header line */ |
| 70 |
static int |
| 71 |
headline(char *s, void *p) |
| 72 |
{ |
| 73 |
DEPTHCODEC *dcp = (DEPTHCODEC *)p; |
| 74 |
int rv; |
| 75 |
|
| 76 |
if (formatval(dcp->inpfmt, s)) /* don't pass format */ |
| 77 |
return 0; |
| 78 |
|
| 79 |
if ((rv = isbigendian(s)) >= 0) { |
| 80 |
dcp->swapped = (nativebigendian() != rv); |
| 81 |
return 0; |
| 82 |
} |
| 83 |
/* check for reference depth */ |
| 84 |
if (!strncmp(s, DEPTHSTR, LDEPTHSTR)) { |
| 85 |
char *cp; |
| 86 |
strlcpy(dcp->depth_unit, s+LDEPTHSTR, sizeof(dcp->depth_unit)); |
| 87 |
cp = dcp->depth_unit; |
| 88 |
while (*cp) cp++; |
| 89 |
while (cp > dcp->depth_unit && isspace(cp[-1])) cp--; |
| 90 |
*cp = '\0'; |
| 91 |
dcp->refdepth = atof(dcp->depth_unit); |
| 92 |
if (dcp->refdepth <= .0) { |
| 93 |
if (dcp->hdrflags & HF_STDERR) { |
| 94 |
fputs(dcp->inpname, stderr); |
| 95 |
fputs(": bad reference depth in input header\n", |
| 96 |
stderr); |
| 97 |
} |
| 98 |
return -1; |
| 99 |
} |
| 100 |
} else if (isview(s)) /* get view params */ |
| 101 |
dcp->gotview += (sscanview(&dcp->vw, s) > 0); |
| 102 |
if (dcp->hdrflags & HF_HEADOUT) |
| 103 |
fputs(s, stdout); /* copy to standard output */ |
| 104 |
return 1; |
| 105 |
} |
| 106 |
|
| 107 |
|
| 108 |
/* Load/copy header */ |
| 109 |
int |
| 110 |
process_dc_header(DEPTHCODEC *dcp, int ac, char *av[]) |
| 111 |
{ |
| 112 |
if (dcp->hdrflags & HF_HEADIN && |
| 113 |
getheader(dcp->finp, headline, dcp) < 0) { |
| 114 |
if (dcp->hdrflags & HF_STDERR) { |
| 115 |
fputs(dcp->inpname, stderr); |
| 116 |
fputs(": bad header\n", stderr); |
| 117 |
} |
| 118 |
return 0; |
| 119 |
} |
| 120 |
if (dcp->hdrflags & HF_HEADOUT) { /* finish header */ |
| 121 |
if (!(dcp->hdrflags & HF_HEADIN)) |
| 122 |
newheader("RADIANCE", stdout); |
| 123 |
if (ac > 0) |
| 124 |
printargs(ac, av, stdout); |
| 125 |
if (dcp->hdrflags & HF_ENCODE) { |
| 126 |
fputs(DEPTHSTR, stdout); |
| 127 |
fputs(dcp->depth_unit, stdout); |
| 128 |
fputc('\n', stdout); |
| 129 |
fputformat(DEPTH16FMT, stdout); |
| 130 |
} else |
| 131 |
switch (dcp->format) { |
| 132 |
case 'a': |
| 133 |
fputformat("ascii", stdout); |
| 134 |
break; |
| 135 |
case 'f': |
| 136 |
fputendian(stdout); |
| 137 |
fputformat("float", stdout); |
| 138 |
break; |
| 139 |
case 'd': |
| 140 |
fputendian(stdout); |
| 141 |
fputformat("double", stdout); |
| 142 |
break; |
| 143 |
} |
| 144 |
fputc('\n', stdout); |
| 145 |
} |
| 146 |
/* get/put resolution string */ |
| 147 |
if (dcp->hdrflags & HF_RESIN && !fgetsresolu(&dcp->res, dcp->finp)) { |
| 148 |
if (dcp->hdrflags & HF_STDERR) { |
| 149 |
fputs(dcp->inpname, stderr); |
| 150 |
fputs(": bad resolution string\n", stderr); |
| 151 |
} |
| 152 |
return 0; |
| 153 |
} |
| 154 |
if (dcp->hdrflags & HF_RESOUT) |
| 155 |
fputsresolu(&dcp->res, stdout); |
| 156 |
|
| 157 |
dcp->dstart = dcp->curpos = ftell(dcp->finp); |
| 158 |
return 1; |
| 159 |
} |
| 160 |
|
| 161 |
|
| 162 |
/* Check that we have what we need to decode depths */ |
| 163 |
int |
| 164 |
check_decode_depths(DEPTHCODEC *dcp) |
| 165 |
{ |
| 166 |
if (dcp->hdrflags & HF_ENCODE) { |
| 167 |
if (dcp->hdrflags & HF_STDERR) { |
| 168 |
fputs(progname, stderr); |
| 169 |
fputs(": wrong header mode for decode\n", stderr); |
| 170 |
} |
| 171 |
return 0; |
| 172 |
} |
| 173 |
if (dcp->inpfmt[0] && strcmp(dcp->inpfmt, DEPTH16FMT)) { |
| 174 |
if (dcp->hdrflags & HF_STDERR) { |
| 175 |
fputs(dcp->inpname, stderr); |
| 176 |
fputs(": unexpected input format: ", stderr); |
| 177 |
fputs(dcp->inpfmt, stderr); |
| 178 |
fputc('\n', stderr); |
| 179 |
} |
| 180 |
return 0; |
| 181 |
} |
| 182 |
return 1; |
| 183 |
} |
| 184 |
|
| 185 |
|
| 186 |
/* Check that we have what we need to decode world positions */ |
| 187 |
int |
| 188 |
check_decode_worldpos(DEPTHCODEC *dcp) |
| 189 |
{ |
| 190 |
char *err; |
| 191 |
|
| 192 |
if (!check_decode_depths(dcp)) |
| 193 |
return 0; |
| 194 |
if ((dcp->res.xr <= 0) | (dcp->res.yr <= 0)) { |
| 195 |
if (dcp->hdrflags & HF_STDERR) { |
| 196 |
fputs(progname, stderr); |
| 197 |
fputs(": missing map resolution\n", stderr); |
| 198 |
} |
| 199 |
return 0; |
| 200 |
} |
| 201 |
if (!dcp->gotview) { |
| 202 |
if (dcp->hdrflags & HF_STDERR) { |
| 203 |
fputs(dcp->inpname, stderr); |
| 204 |
fputs(": missing view\n", stderr); |
| 205 |
} |
| 206 |
return 0; |
| 207 |
} |
| 208 |
if ((err = setview(&dcp->vw)) != NULL) { |
| 209 |
if (dcp->hdrflags & HF_STDERR) { |
| 210 |
fputs(dcp->inpname, stderr); |
| 211 |
fputs(": input view error: ", stderr); |
| 212 |
fputs(err, stderr); |
| 213 |
fputc('\n', stderr); |
| 214 |
} |
| 215 |
return 0; |
| 216 |
} |
| 217 |
return 1; |
| 218 |
} |
| 219 |
|
| 220 |
|
| 221 |
/* Decode next depth pixel */ |
| 222 |
double |
| 223 |
decode_depth_next(DEPTHCODEC *dcp) |
| 224 |
{ |
| 225 |
int c; |
| 226 |
|
| 227 |
if (dcp->use_last) { |
| 228 |
dcp->use_last = 0; |
| 229 |
return code2depth(dcp->last_dc, dcp->refdepth); |
| 230 |
} |
| 231 |
c = getint(2, dcp->finp); |
| 232 |
|
| 233 |
if (c == EOF && feof(dcp->finp)) |
| 234 |
return -1.; |
| 235 |
|
| 236 |
dcp->last_dc = c; |
| 237 |
dcp->curpos += 2; |
| 238 |
|
| 239 |
return code2depth(c, dcp->refdepth); |
| 240 |
} |
| 241 |
|
| 242 |
|
| 243 |
/* Compute world position from depth */ |
| 244 |
int |
| 245 |
compute_worldpos(FVECT wpos, DEPTHCODEC *dcp, int x, int y, double d) |
| 246 |
{ |
| 247 |
RREAL loc[2]; |
| 248 |
FVECT rdir; |
| 249 |
|
| 250 |
pix2loc(loc, &dcp->res, x, y); |
| 251 |
|
| 252 |
if (viewray(wpos, rdir, &dcp->vw, loc[0], loc[1]) < -FTINY) { |
| 253 |
VCOPY(wpos, dcp->vw.vp); |
| 254 |
return 0; |
| 255 |
} |
| 256 |
VSUM(wpos, wpos, rdir, d); |
| 257 |
return 1; |
| 258 |
} |
| 259 |
|
| 260 |
|
| 261 |
/* Decode the next world position */ |
| 262 |
int |
| 263 |
decode_worldpos_next(FVECT wpos, DEPTHCODEC *dcp) |
| 264 |
{ |
| 265 |
const long n = (dcp->curpos - dcp->dstart)>>1; |
| 266 |
int x, y; |
| 267 |
double d; |
| 268 |
|
| 269 |
d = decode_depth_next(dcp); |
| 270 |
if (d < -FTINY) |
| 271 |
return -1; |
| 272 |
|
| 273 |
x = scanlen(&dcp->res); |
| 274 |
y = n / x; |
| 275 |
x = n - (long)y*x; |
| 276 |
|
| 277 |
return compute_worldpos(wpos, dcp, x, y, d); |
| 278 |
} |
| 279 |
|
| 280 |
|
| 281 |
/* Seek to the indicated pixel position */ |
| 282 |
int |
| 283 |
seek_dc_pix(DEPTHCODEC *dcp, int x, int y) |
| 284 |
{ |
| 285 |
long seekpos; |
| 286 |
|
| 287 |
if ((dcp->res.xr <= 0) | (dcp->res.yr <= 0)) { |
| 288 |
if (dcp->hdrflags & HF_STDERR) { |
| 289 |
fputs(progname, stderr); |
| 290 |
fputs(": need map resolution to seek\n", stderr); |
| 291 |
} |
| 292 |
return -1; |
| 293 |
} |
| 294 |
if ((x < 0) | (y < 0) || |
| 295 |
(x >= scanlen(&dcp->res)) | (y >= numscans(&dcp->res))) { |
| 296 |
if (dcp->hdrflags & HF_STDERR) { |
| 297 |
fputs(dcp->inpname, stderr); |
| 298 |
fputs(": warning - pixel index off map\n", stderr); |
| 299 |
} |
| 300 |
return 0; |
| 301 |
} |
| 302 |
seekpos = dcp->dstart + 2*((long)y*scanlen(&dcp->res) + x); |
| 303 |
|
| 304 |
if (seekpos == dcp->curpos-2) { |
| 305 |
dcp->use_last++; /* avoids seek/read */ |
| 306 |
return 1; |
| 307 |
} |
| 308 |
if (seekpos != dcp->curpos && |
| 309 |
fseek(dcp->finp, seekpos, SEEK_SET) == EOF) { |
| 310 |
if (dcp->hdrflags & HF_STDERR) { |
| 311 |
fputs(dcp->inpname, stderr); |
| 312 |
fputs(": seek error\n", stderr); |
| 313 |
} |
| 314 |
return -1; |
| 315 |
} |
| 316 |
dcp->curpos = seekpos; |
| 317 |
return 1; |
| 318 |
} |
| 319 |
|
| 320 |
|
| 321 |
/* Read and decode depth for the given pixel */ |
| 322 |
double |
| 323 |
decode_depth_pix(DEPTHCODEC *dcp, int x, int y) |
| 324 |
{ |
| 325 |
int rval = seek_dc_pix(dcp, x, y); |
| 326 |
|
| 327 |
if (rval < 0) |
| 328 |
return -1.; |
| 329 |
if (!rval) |
| 330 |
return .0; |
| 331 |
|
| 332 |
return decode_depth_next(dcp); |
| 333 |
} |
| 334 |
|
| 335 |
|
| 336 |
/* Read and decode the world position at the given pixel */ |
| 337 |
int |
| 338 |
get_worldpos_pix(FVECT wpos, DEPTHCODEC *dcp, int x, int y) |
| 339 |
{ |
| 340 |
double d = decode_depth_pix(dcp, x, y); |
| 341 |
|
| 342 |
if (d < -FTINY) |
| 343 |
return -1; |
| 344 |
|
| 345 |
return compute_worldpos(wpos, dcp, x, y, d); |
| 346 |
} |
