| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id$"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines for tone mapping on Radiance RGBE and XYZE pictures. |
| 6 |
* |
| 7 |
* Externals declared in tonemap.h |
| 8 |
*/ |
| 9 |
|
| 10 |
/* ==================================================================== |
| 11 |
* The Radiance Software License, Version 1.0 |
| 12 |
* |
| 13 |
* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
| 15 |
* |
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* Redistribution and use in source and binary forms, with or without |
| 17 |
* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
| 21 |
* notice, this list of conditions and the following disclaimer. |
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* |
| 23 |
* 2. Redistributions in binary form must reproduce the above copyright |
| 24 |
* notice, this list of conditions and the following disclaimer in |
| 25 |
* the documentation and/or other materials provided with the |
| 26 |
* distribution. |
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* |
| 28 |
* 3. The end-user documentation included with the redistribution, |
| 29 |
* if any, must include the following acknowledgment: |
| 30 |
* "This product includes Radiance software |
| 31 |
* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
| 33 |
* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
| 40 |
* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
| 44 |
* nor may "Radiance" appear in their name, without prior written |
| 45 |
* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 49 |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 52 |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
| 64 |
* <http://www.lbl.gov/>. |
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*/ |
| 66 |
|
| 67 |
#include <stdio.h> |
| 68 |
#include <string.h> |
| 69 |
#include <math.h> |
| 70 |
#include <time.h> |
| 71 |
#include "tmprivat.h" |
| 72 |
#include "resolu.h" |
| 73 |
|
| 74 |
#ifndef TM_PIC_CTRANS |
| 75 |
#define TM_PIC_CTRANS 1 /* transform colors? (expensive) */ |
| 76 |
#endif |
| 77 |
|
| 78 |
#define GAMTSZ 1024 |
| 79 |
|
| 80 |
typedef struct { |
| 81 |
BYTE gamb[GAMTSZ]; /* gamma lookup table */ |
| 82 |
COLR clfb; /* encoded tm->clf */ |
| 83 |
TMbright inpsfb; /* encoded tm->inpsf */ |
| 84 |
} COLRDATA; |
| 85 |
|
| 86 |
#ifdef NOPROTO |
| 87 |
static MEM_PTR colrInit(); |
| 88 |
static void colrNewSpace(); |
| 89 |
#else |
| 90 |
static MEM_PTR colrInit(struct tmStruct *); |
| 91 |
static void colrNewSpace(struct tmStruct *); |
| 92 |
#endif |
| 93 |
static struct tmPackage colrPkg = { /* our package functions */ |
| 94 |
colrInit, colrNewSpace, free |
| 95 |
}; |
| 96 |
static int colrReg = -1; /* our package registration number */ |
| 97 |
|
| 98 |
#define LOGISZ 260 |
| 99 |
static TMbright logi[LOGISZ]; |
| 100 |
|
| 101 |
|
| 102 |
int |
| 103 |
tmCvColrs(ls, cs, scan, len) /* convert RGBE/XYZE colors */ |
| 104 |
TMbright *ls; |
| 105 |
BYTE *cs; |
| 106 |
COLR *scan; |
| 107 |
int len; |
| 108 |
{ |
| 109 |
static char funcName[] = "tmCvColrs"; |
| 110 |
COLR cmon; |
| 111 |
register COLRDATA *cd; |
| 112 |
register int i, bi, li; |
| 113 |
|
| 114 |
if (tmTop == NULL) |
| 115 |
returnErr(TM_E_TMINVAL); |
| 116 |
if (ls == NULL | scan == NULL | len < 0) |
| 117 |
returnErr(TM_E_ILLEGAL); |
| 118 |
#if TM_PIC_CTRANS |
| 119 |
if (tmNeedMatrix(tmTop)) { /* need floating point */ |
| 120 |
#else |
| 121 |
if (tmTop->inppri == TM_XYZPRIM) { /* no way around this */ |
| 122 |
#endif |
| 123 |
register COLOR *newscan; |
| 124 |
newscan = (COLOR *)tempbuffer(len*sizeof(COLOR)); |
| 125 |
if (newscan == NULL) |
| 126 |
returnErr(TM_E_NOMEM); |
| 127 |
for (i = len; i--; ) |
| 128 |
colr_color(newscan[i], scan[i]); |
| 129 |
return(tmCvColors(ls, cs, newscan, len)); |
| 130 |
} |
| 131 |
if (colrReg < 0) { /* build tables if necessary */ |
| 132 |
colrReg = tmRegPkg(&colrPkg); |
| 133 |
if (colrReg < 0) |
| 134 |
returnErr(TM_E_CODERR1); |
| 135 |
for (i = 256; i--; ) |
| 136 |
logi[i] = TM_BRTSCALE*log((i+.5)/256.) - .5; |
| 137 |
for (i = 256; i < LOGISZ; i++) |
| 138 |
logi[i] = 0; |
| 139 |
tmMkMesofact(); |
| 140 |
} |
| 141 |
if ((cd = (COLRDATA *)tmPkgData(tmTop,colrReg)) == NULL) |
| 142 |
returnErr(TM_E_NOMEM); |
| 143 |
for (i = len; i--; ) { |
| 144 |
copycolr(cmon, scan[i]); |
| 145 |
/* world luminance */ |
| 146 |
li = ( cd->clfb[RED]*cmon[RED] + |
| 147 |
cd->clfb[GRN]*cmon[GRN] + |
| 148 |
cd->clfb[BLU]*cmon[BLU] ) >> 8; |
| 149 |
bi = BRT2SCALE(cmon[EXP]-COLXS) + |
| 150 |
logi[li] + cd->inpsfb; |
| 151 |
if (li <= 0) { |
| 152 |
bi = TM_NOBRT; /* bogus value */ |
| 153 |
li = 1; /* avoid li==0 */ |
| 154 |
} |
| 155 |
ls[i] = bi; |
| 156 |
if (cs == TM_NOCHROM) /* no color? */ |
| 157 |
continue; |
| 158 |
/* mesopic adj. */ |
| 159 |
if (tmTop->flags & TM_F_MESOPIC && bi < BMESUPPER) { |
| 160 |
register int pf, sli = normscot(cmon); |
| 161 |
if (bi < BMESLOWER) |
| 162 |
cmon[RED] = cmon[GRN] = cmon[BLU] = sli; |
| 163 |
else { |
| 164 |
if (tmTop->flags & TM_F_BW) |
| 165 |
cmon[RED] = cmon[GRN] = cmon[BLU] = li; |
| 166 |
pf = tmMesofact[bi-BMESLOWER]; |
| 167 |
sli *= 256 - pf; |
| 168 |
cmon[RED] = ( sli + pf*cmon[RED] ) >> 8; |
| 169 |
cmon[GRN] = ( sli + pf*cmon[GRN] ) >> 8; |
| 170 |
cmon[BLU] = ( sli + pf*cmon[BLU] ) >> 8; |
| 171 |
} |
| 172 |
} else if (tmTop->flags & TM_F_BW) { |
| 173 |
cmon[RED] = cmon[GRN] = cmon[BLU] = li; |
| 174 |
} |
| 175 |
bi = ( (int4)GAMTSZ*cd->clfb[RED]*cmon[RED]/li ) >> 8; |
| 176 |
cs[3*i ] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
| 177 |
bi = ( (int4)GAMTSZ*cd->clfb[GRN]*cmon[GRN]/li ) >> 8; |
| 178 |
cs[3*i+1] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
| 179 |
bi = ( (int4)GAMTSZ*cd->clfb[BLU]*cmon[BLU]/li ) >> 8; |
| 180 |
cs[3*i+2] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
| 181 |
} |
| 182 |
returnOK; |
| 183 |
} |
| 184 |
|
| 185 |
|
| 186 |
#define FMTRGB 1 /* Input is RGBE */ |
| 187 |
#define FMTCIE 2 /* Input is CIE XYZE */ |
| 188 |
#define FMTUNK 3 /* Input format is unspecified */ |
| 189 |
#define FMTBAD 4 /* Input is not a recognized format */ |
| 190 |
|
| 191 |
static struct radhead { |
| 192 |
int format; /* FMTRGB, FMTCIE, FMTUNK, FMTBAD */ |
| 193 |
double expos; /* input exposure value */ |
| 194 |
RGBPRIMP primp; /* input primaries */ |
| 195 |
RGBPRIMS mypri; /* custom primaries */ |
| 196 |
} rhdefault = {FMTUNK, 1., stdprims, STDPRIMS}; |
| 197 |
|
| 198 |
|
| 199 |
static int |
| 200 |
headline(s, rh) /* grok a header line */ |
| 201 |
register char *s; |
| 202 |
register struct radhead *rh; |
| 203 |
{ |
| 204 |
char fmt[32]; |
| 205 |
|
| 206 |
if (formatval(fmt, s)) { |
| 207 |
if (!strcmp(fmt, COLRFMT)) |
| 208 |
rh->format = FMTRGB; |
| 209 |
else if (!strcmp(fmt, CIEFMT)) |
| 210 |
rh->format = FMTCIE; |
| 211 |
else |
| 212 |
rh->format = FMTBAD; |
| 213 |
return(0); |
| 214 |
} |
| 215 |
if (isexpos(s)) { |
| 216 |
rh->expos *= exposval(s); |
| 217 |
return(0); |
| 218 |
} |
| 219 |
if (isprims(s)) { |
| 220 |
primsval(rh->mypri, s); |
| 221 |
rh->primp = rh->mypri; |
| 222 |
return(0); |
| 223 |
} |
| 224 |
return(0); |
| 225 |
} |
| 226 |
|
| 227 |
|
| 228 |
int |
| 229 |
tmLoadPicture(lpp, cpp, xp, yp, fname, fp) /* convert Radiance picture */ |
| 230 |
TMbright **lpp; |
| 231 |
BYTE **cpp; |
| 232 |
int *xp, *yp; |
| 233 |
char *fname; |
| 234 |
FILE *fp; |
| 235 |
{ |
| 236 |
char *funcName = fname==NULL ? "tmLoadPicture" : fname; |
| 237 |
FILE *inpf; |
| 238 |
struct radhead info; |
| 239 |
int err; |
| 240 |
COLR *scanin = NULL; |
| 241 |
int i; |
| 242 |
/* check arguments */ |
| 243 |
if (tmTop == NULL) |
| 244 |
returnErr(TM_E_TMINVAL); |
| 245 |
if (lpp == NULL | xp == NULL | yp == NULL | |
| 246 |
(fname == NULL & fp == TM_GETFILE)) |
| 247 |
returnErr(TM_E_ILLEGAL); |
| 248 |
*xp = *yp = 0; /* error precaution */ |
| 249 |
if ((inpf = fp) == TM_GETFILE && (inpf = fopen(fname, "r")) == NULL) |
| 250 |
returnErr(TM_E_BADFILE); |
| 251 |
*lpp = NULL; |
| 252 |
if (cpp != TM_NOCHROMP) *cpp = NULL; |
| 253 |
info = rhdefault; /* get our header */ |
| 254 |
getheader(inpf, headline, (char *)&info); |
| 255 |
if (info.format == FMTBAD | info.expos <= 0. || |
| 256 |
fgetresolu(xp, yp, inpf) < 0) { |
| 257 |
err = TM_E_BADFILE; goto done; |
| 258 |
} |
| 259 |
if (info.format == FMTUNK) /* assume RGBE format */ |
| 260 |
info.format = FMTRGB; |
| 261 |
if (info.format == FMTRGB) |
| 262 |
info.expos /= WHTEFFICACY; |
| 263 |
else if (info.format == FMTCIE) |
| 264 |
info.primp = TM_XYZPRIM; |
| 265 |
/* prepare library */ |
| 266 |
if ((err = tmSetSpace(info.primp, 1./info.expos)) != TM_E_OK) |
| 267 |
goto done; |
| 268 |
err = TM_E_NOMEM; /* allocate arrays */ |
| 269 |
*lpp = (TMbright *)malloc(sizeof(TMbright) * *xp * *yp); |
| 270 |
if (*lpp == NULL) |
| 271 |
goto done; |
| 272 |
if (cpp != TM_NOCHROMP) { |
| 273 |
*cpp = (BYTE *)malloc(3*sizeof(BYTE) * *xp * *yp); |
| 274 |
if (*cpp == NULL) |
| 275 |
goto done; |
| 276 |
} |
| 277 |
scanin = (COLR *)malloc(sizeof(COLR) * *xp); |
| 278 |
if (scanin == NULL) |
| 279 |
goto done; |
| 280 |
err = TM_E_BADFILE; /* read & convert scanlines */ |
| 281 |
for (i = 0; i < *yp; i++) { |
| 282 |
if (freadcolrs(scanin, *xp, inpf) < 0) { |
| 283 |
err = TM_E_BADFILE; break; |
| 284 |
} |
| 285 |
err = tmCvColrs(*lpp + (i * *xp), |
| 286 |
cpp==TM_NOCHROMP ? TM_NOCHROM : *cpp + (i * 3 * *xp), |
| 287 |
scanin, *xp); |
| 288 |
if (err != TM_E_OK) |
| 289 |
break; |
| 290 |
} |
| 291 |
done: /* clean up */ |
| 292 |
if (fp == NULL) |
| 293 |
fclose(inpf); |
| 294 |
if (scanin != NULL) |
| 295 |
free((MEM_PTR)scanin); |
| 296 |
if (err != TM_E_OK) { |
| 297 |
if (*lpp != NULL) |
| 298 |
free((MEM_PTR)*lpp); |
| 299 |
if (cpp != TM_NOCHROMP && *cpp != NULL) |
| 300 |
free((MEM_PTR)*cpp); |
| 301 |
returnErr(err); |
| 302 |
} |
| 303 |
returnOK; |
| 304 |
} |
| 305 |
|
| 306 |
|
| 307 |
#ifdef PCOND |
| 308 |
int /* run pcond to map picture */ |
| 309 |
dopcond(psp, xp, yp, flags, monpri, gamval, Lddyn, Ldmax, fname) |
| 310 |
BYTE **psp; |
| 311 |
int *xp, *yp; |
| 312 |
int flags; |
| 313 |
RGBPRIMP monpri; |
| 314 |
double gamval, Lddyn, Ldmax; |
| 315 |
char *fname; |
| 316 |
{ |
| 317 |
char *funcName = fname; |
| 318 |
char cmdbuf[1024]; |
| 319 |
FILE *infp; |
| 320 |
register COLR *scan; |
| 321 |
register BYTE *rp; |
| 322 |
int y; |
| 323 |
register int x; |
| 324 |
/* set up gamma correction */ |
| 325 |
if (setcolrcor(pow, 1./gamval) < 0) |
| 326 |
returnErr(TM_E_NOMEM); |
| 327 |
/* create command */ |
| 328 |
strcpy(cmdbuf, PCOND); |
| 329 |
if (flags & TM_F_HCONTR) |
| 330 |
strcat(cmdbuf, " -s"); |
| 331 |
if (flags & TM_F_MESOPIC) |
| 332 |
strcat(cmdbuf, " -c"); |
| 333 |
if (flags & TM_F_LINEAR) |
| 334 |
strcat(cmdbuf, " -l"); |
| 335 |
if (flags & TM_F_ACUITY) |
| 336 |
strcat(cmdbuf, " -a"); |
| 337 |
if (flags & TM_F_VEIL) |
| 338 |
strcat(cmdbuf, " -v"); |
| 339 |
if (flags & TM_F_CWEIGHT) |
| 340 |
strcat(cmdbuf, " -w"); |
| 341 |
if (monpri != stdprims) |
| 342 |
sprintf(cmdbuf+strlen(cmdbuf), " -p %f %f %f %f %f %f %f %f", |
| 343 |
monpri[RED][CIEX], monpri[RED][CIEY], |
| 344 |
monpri[GRN][CIEX], monpri[GRN][CIEY], |
| 345 |
monpri[BLU][CIEX], monpri[BLU][CIEY], |
| 346 |
monpri[WHT][CIEX], monpri[WHT][CIEY]); |
| 347 |
sprintf(cmdbuf+strlen(cmdbuf), " -d %f -u %f %s", Lddyn, Ldmax, fname); |
| 348 |
/* start pcond */ |
| 349 |
if ((infp = popen(cmdbuf, "r")) == NULL) |
| 350 |
returnErr(TM_E_BADFILE); |
| 351 |
/* check picture format and size */ |
| 352 |
if (checkheader(infp, COLRFMT, NULL) < 0 || |
| 353 |
fgetresolu(xp, yp, infp) < 0) { |
| 354 |
pclose(infp); |
| 355 |
returnErr(TM_E_BADFILE); |
| 356 |
} |
| 357 |
/* allocate arrays */ |
| 358 |
scan = (COLR *)malloc(sizeof(COLR) * *xp); |
| 359 |
if (flags & TM_F_BW) |
| 360 |
rp = (BYTE *)malloc(sizeof(BYTE) * *xp * *yp); |
| 361 |
else |
| 362 |
rp = (BYTE *)malloc(3*sizeof(BYTE) * *xp * *yp); |
| 363 |
if ((*psp = rp) == NULL | scan == NULL) { |
| 364 |
pclose(infp); |
| 365 |
returnErr(TM_E_NOMEM); |
| 366 |
} |
| 367 |
/* read and gamma map file */ |
| 368 |
for (y = 0; y < *yp; y++) { |
| 369 |
if (freadcolrs(scan, *xp, infp) < 0) { |
| 370 |
pclose(infp); |
| 371 |
free((MEM_PTR)scan); |
| 372 |
free((MEM_PTR)*psp); |
| 373 |
*psp = NULL; |
| 374 |
returnErr(TM_E_BADFILE); |
| 375 |
} |
| 376 |
colrs_gambs(scan, *xp); |
| 377 |
if (flags & TM_F_BW) |
| 378 |
for (x = 0; x < *xp; x++) |
| 379 |
*rp++ = normbright(scan[x]); |
| 380 |
else |
| 381 |
for (x = 0; x < *xp; x++) { |
| 382 |
*rp++ = scan[x][RED]; |
| 383 |
*rp++ = scan[x][GRN]; |
| 384 |
*rp++ = scan[x][BLU]; |
| 385 |
} |
| 386 |
} |
| 387 |
free((MEM_PTR)scan); |
| 388 |
pclose(infp); |
| 389 |
returnOK; |
| 390 |
} |
| 391 |
#endif |
| 392 |
|
| 393 |
|
| 394 |
int /* map a Radiance picture */ |
| 395 |
tmMapPicture(psp, xp, yp, flags, monpri, gamval, Lddyn, Ldmax, fname, fp) |
| 396 |
BYTE **psp; |
| 397 |
int *xp, *yp; |
| 398 |
int flags; |
| 399 |
RGBPRIMP monpri; |
| 400 |
double gamval, Lddyn, Ldmax; |
| 401 |
char *fname; |
| 402 |
FILE *fp; |
| 403 |
{ |
| 404 |
char *funcName = fname==NULL ? "tmMapPicture" : fname; |
| 405 |
BYTE *cp; |
| 406 |
TMbright *lp; |
| 407 |
int err; |
| 408 |
/* check arguments */ |
| 409 |
if (psp == NULL | xp == NULL | yp == NULL | monpri == NULL | |
| 410 |
(fname == NULL & fp == TM_GETFILE)) |
| 411 |
returnErr(TM_E_ILLEGAL); |
| 412 |
/* set defaults */ |
| 413 |
if (gamval < MINGAM) gamval = DEFGAM; |
| 414 |
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
| 415 |
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
| 416 |
if (flags & TM_F_BW) monpri = stdprims; |
| 417 |
#ifdef PCOND |
| 418 |
/* check for pcond run */ |
| 419 |
if (fp == TM_GETFILE && flags & TM_F_UNIMPL) |
| 420 |
return( dopcond(psp, xp, yp, flags, |
| 421 |
monpri, gamval, Lddyn, Ldmax, fname) ); |
| 422 |
#endif |
| 423 |
/* initialize tone mapping */ |
| 424 |
if (tmInit(flags, monpri, gamval) == NULL) |
| 425 |
returnErr(TM_E_NOMEM); |
| 426 |
/* load & convert picture */ |
| 427 |
err = tmLoadPicture(&lp, (flags&TM_F_BW) ? TM_NOCHROMP : &cp, |
| 428 |
xp, yp, fname, fp); |
| 429 |
if (err != TM_E_OK) { |
| 430 |
tmDone(NULL); |
| 431 |
return(err); |
| 432 |
} |
| 433 |
/* allocate space for result */ |
| 434 |
if (flags & TM_F_BW) { |
| 435 |
*psp = (BYTE *)malloc(sizeof(BYTE) * *xp * *yp); |
| 436 |
if (*psp == NULL) { |
| 437 |
free((MEM_PTR)lp); |
| 438 |
tmDone(NULL); |
| 439 |
returnErr(TM_E_NOMEM); |
| 440 |
} |
| 441 |
cp = TM_NOCHROM; |
| 442 |
} else |
| 443 |
*psp = cp; |
| 444 |
/* compute color mapping */ |
| 445 |
err = tmAddHisto(lp, *xp * *yp, 1); |
| 446 |
if (err != TM_E_OK) |
| 447 |
goto done; |
| 448 |
err = tmComputeMapping(gamval, Lddyn, Ldmax); |
| 449 |
if (err != TM_E_OK) |
| 450 |
goto done; |
| 451 |
/* map colors */ |
| 452 |
err = tmMapPixels(*psp, lp, cp, *xp * *yp); |
| 453 |
|
| 454 |
done: /* clean up */ |
| 455 |
free((MEM_PTR)lp); |
| 456 |
tmDone(NULL); |
| 457 |
if (err != TM_E_OK) { /* free memory on error */ |
| 458 |
free((MEM_PTR)*psp); |
| 459 |
*psp = NULL; |
| 460 |
returnErr(err); |
| 461 |
} |
| 462 |
returnOK; |
| 463 |
} |
| 464 |
|
| 465 |
|
| 466 |
static void |
| 467 |
colrNewSpace(tms) /* color space changed for tone mapping */ |
| 468 |
register struct tmStruct *tms; |
| 469 |
{ |
| 470 |
register COLRDATA *cd; |
| 471 |
double d; |
| 472 |
|
| 473 |
cd = (COLRDATA *)tms->pd[colrReg]; |
| 474 |
cd->clfb[RED] = 256.*tms->clf[RED] + .5; |
| 475 |
cd->clfb[GRN] = 256.*tms->clf[GRN] + .5; |
| 476 |
cd->clfb[BLU] = 256.*tms->clf[BLU] + .5; |
| 477 |
cd->clfb[EXP] = COLXS; |
| 478 |
d = TM_BRTSCALE*log(tms->inpsf); |
| 479 |
cd->inpsfb = d<0. ? d-.5 : d+.5; |
| 480 |
} |
| 481 |
|
| 482 |
|
| 483 |
static MEM_PTR |
| 484 |
colrInit(tms) /* initialize private data for tone mapping */ |
| 485 |
register struct tmStruct *tms; |
| 486 |
{ |
| 487 |
register COLRDATA *cd; |
| 488 |
register int i; |
| 489 |
/* allocate our data */ |
| 490 |
cd = (COLRDATA *)malloc(sizeof(COLRDATA)); |
| 491 |
if (cd == NULL) |
| 492 |
return(NULL); |
| 493 |
tms->pd[colrReg] = (MEM_PTR)cd; |
| 494 |
/* compute gamma table */ |
| 495 |
for (i = GAMTSZ; i--; ) |
| 496 |
cd->gamb[i] = 256.*pow((i+.5)/GAMTSZ, 1./tms->mongam); |
| 497 |
/* compute color and scale factors */ |
| 498 |
colrNewSpace(tms); |
| 499 |
return((MEM_PTR)cd); |
| 500 |
} |
