1 |
gwlarson |
3.4 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
2 |
greg |
3.1 |
|
3 |
|
|
#ifndef lint |
4 |
gwlarson |
3.4 |
static char SCCSid[] = "$SunId$ SGI"; |
5 |
greg |
3.1 |
#endif |
6 |
|
|
|
7 |
|
|
/* |
8 |
|
|
* Routines for tone mapping on Radiance RGBE and XYZE pictures. |
9 |
|
|
* See tonemap.h for detailed function descriptions. |
10 |
|
|
*/ |
11 |
|
|
|
12 |
|
|
#include <stdio.h> |
13 |
|
|
#include <math.h> |
14 |
|
|
#include "tmprivat.h" |
15 |
|
|
#include "resolu.h" |
16 |
|
|
|
17 |
|
|
|
18 |
|
|
extern char *tempbuffer(); |
19 |
|
|
|
20 |
greg |
3.3 |
#define GAMTSZ 1024 |
21 |
|
|
|
22 |
|
|
typedef struct { |
23 |
|
|
BYTE gamb[GAMTSZ]; /* gamma lookup table */ |
24 |
|
|
COLR clfb; /* encoded tm->clf */ |
25 |
|
|
TMbright inpsfb; /* encoded tm->inpsf */ |
26 |
|
|
} COLRDATA; |
27 |
|
|
|
28 |
|
|
static MEM_PTR colrInit(); |
29 |
|
|
static void colrNewSpace(); |
30 |
|
|
extern void free(); |
31 |
|
|
static struct tmPackage colrPkg = { /* our package functions */ |
32 |
|
|
colrInit, colrNewSpace, free |
33 |
|
|
}; |
34 |
|
|
static int colrReg = -1; /* our package registration number */ |
35 |
|
|
|
36 |
greg |
3.1 |
#define LOGISZ 260 |
37 |
|
|
static TMbright logi[LOGISZ]; |
38 |
|
|
static BYTE photofact[BMESUPPER-BMESLOWER]; |
39 |
|
|
|
40 |
|
|
|
41 |
|
|
int |
42 |
gwlarson |
3.6 |
tmCvColrs(ls, cs, scan, len) /* convert RGBE/XYZE colors */ |
43 |
greg |
3.1 |
TMbright *ls; |
44 |
|
|
BYTE *cs; |
45 |
|
|
COLR *scan; |
46 |
|
|
int len; |
47 |
|
|
{ |
48 |
|
|
static char funcName[] = "tmCvColrs"; |
49 |
|
|
COLR cmon; |
50 |
greg |
3.3 |
register COLRDATA *cd; |
51 |
greg |
3.1 |
register int i, bi, li; |
52 |
|
|
|
53 |
|
|
if (tmTop == NULL) |
54 |
|
|
returnErr(TM_E_TMINVAL); |
55 |
gwlarson |
3.4 |
if (ls == NULL | scan == NULL | len < 0) |
56 |
greg |
3.1 |
returnErr(TM_E_ILLEGAL); |
57 |
greg |
3.3 |
if (tmNeedMatrix(tmTop)) { /* need floating point */ |
58 |
greg |
3.1 |
register COLOR *newscan; |
59 |
|
|
newscan = (COLOR *)tempbuffer(len*sizeof(COLOR)); |
60 |
|
|
if (newscan == NULL) |
61 |
|
|
returnErr(TM_E_NOMEM); |
62 |
|
|
for (i = len; i--; ) |
63 |
|
|
colr_color(newscan[i], scan[i]); |
64 |
|
|
return(tmCvColors(ls, cs, newscan, len)); |
65 |
|
|
} |
66 |
gwlarson |
3.6 |
if (colrReg < 0) { /* build tables if necessary */ |
67 |
greg |
3.3 |
colrReg = tmRegPkg(&colrPkg); |
68 |
|
|
if (colrReg < 0) |
69 |
|
|
returnErr(TM_E_CODERR1); |
70 |
greg |
3.1 |
for (i = 256; i--; ) |
71 |
|
|
logi[i] = TM_BRTSCALE*log((i+.5)/256.) - .5; |
72 |
|
|
for (i = 256; i < LOGISZ; i++) |
73 |
|
|
logi[i] = logi[255]; |
74 |
|
|
for (i = BMESLOWER; i < BMESUPPER; i++) |
75 |
|
|
photofact[i-BMESLOWER] = 256. * |
76 |
|
|
(tmLuminance(i) - LMESLOWER) / |
77 |
|
|
(LMESUPPER - LMESLOWER); |
78 |
|
|
} |
79 |
greg |
3.3 |
if ((cd = (COLRDATA *)tmPkgData(tmTop,colrReg)) == NULL) |
80 |
|
|
returnErr(TM_E_NOMEM); |
81 |
greg |
3.1 |
for (i = len; i--; ) { |
82 |
|
|
copycolr(cmon, scan[i]); |
83 |
|
|
/* world luminance */ |
84 |
greg |
3.3 |
li = ( cd->clfb[RED]*cmon[RED] + |
85 |
|
|
cd->clfb[GRN]*cmon[GRN] + |
86 |
|
|
cd->clfb[BLU]*cmon[BLU] ) >> 8; |
87 |
greg |
3.1 |
bi = BRT2SCALE*(cmon[EXP]-COLXS) + |
88 |
greg |
3.3 |
logi[li] + cd->inpsfb; |
89 |
greg |
3.1 |
if (bi < MINBRT) { |
90 |
|
|
bi = MINBRT-1; /* bogus value */ |
91 |
|
|
li++; /* avoid li==0 */ |
92 |
|
|
} |
93 |
|
|
ls[i] = bi; |
94 |
|
|
if (cs == TM_NOCHROM) /* no color? */ |
95 |
|
|
continue; |
96 |
gwlarson |
3.5 |
if (tmTop->flags & TM_F_BW) |
97 |
|
|
cmon[RED] = cmon[GRN] = cmon[BLU] = li; |
98 |
greg |
3.1 |
/* mesopic adj. */ |
99 |
|
|
if (tmTop->flags & TM_F_MESOPIC && bi < BMESUPPER) { |
100 |
|
|
register int pf, sli = normscot(cmon); |
101 |
|
|
if (bi < BMESLOWER) |
102 |
|
|
cmon[RED] = cmon[GRN] = cmon[BLU] = sli; |
103 |
|
|
else { |
104 |
|
|
pf = photofact[bi-BMESLOWER]; |
105 |
|
|
sli *= 256 - pf; |
106 |
|
|
cmon[RED] = ( sli + pf*cmon[RED] ) >> 8; |
107 |
|
|
cmon[GRN] = ( sli + pf*cmon[GRN] ) >> 8; |
108 |
|
|
cmon[BLU] = ( sli + pf*cmon[BLU] ) >> 8; |
109 |
|
|
} |
110 |
|
|
} |
111 |
greg |
3.3 |
bi = ( (int4)GAMTSZ*cd->clfb[RED]*cmon[RED]/li ) >> 8; |
112 |
|
|
cs[3*i ] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
113 |
|
|
bi = ( (int4)GAMTSZ*cd->clfb[GRN]*cmon[GRN]/li ) >> 8; |
114 |
|
|
cs[3*i+1] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
115 |
|
|
bi = ( (int4)GAMTSZ*cd->clfb[BLU]*cmon[BLU]/li ) >> 8; |
116 |
|
|
cs[3*i+2] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
117 |
greg |
3.1 |
} |
118 |
|
|
returnOK; |
119 |
|
|
} |
120 |
|
|
|
121 |
|
|
|
122 |
|
|
#define FMTRGB 1 /* Input is RGBE */ |
123 |
|
|
#define FMTCIE 2 /* Input is CIE XYZE */ |
124 |
|
|
#define FMTUNK 3 /* Input format is unspecified */ |
125 |
|
|
#define FMTBAD 4 /* Input is not a recognized format */ |
126 |
|
|
|
127 |
|
|
static struct radhead { |
128 |
|
|
int format; /* FMTRGB, FMTCIE, FMTUNK, FMTBAD */ |
129 |
|
|
double expos; /* input exposure value */ |
130 |
|
|
RGBPRIMP primp; /* input primaries */ |
131 |
|
|
RGBPRIMS mypri; /* custom primaries */ |
132 |
|
|
} rhdefault = {FMTUNK, 1., stdprims, STDPRIMS}; |
133 |
|
|
|
134 |
|
|
|
135 |
|
|
static int |
136 |
|
|
headline(s, rh) /* grok a header line */ |
137 |
|
|
register char *s; |
138 |
|
|
register struct radhead *rh; |
139 |
|
|
{ |
140 |
|
|
char fmt[32]; |
141 |
|
|
|
142 |
|
|
if (formatval(fmt, s)) { |
143 |
|
|
if (!strcmp(fmt, COLRFMT)) |
144 |
|
|
rh->format = FMTRGB; |
145 |
|
|
else if (!strcmp(fmt, CIEFMT)) |
146 |
|
|
rh->format = FMTCIE; |
147 |
|
|
else |
148 |
|
|
rh->format = FMTBAD; |
149 |
gwlarson |
3.7 |
return(0); |
150 |
greg |
3.1 |
} |
151 |
|
|
if (isexpos(s)) { |
152 |
|
|
rh->expos *= exposval(s); |
153 |
gwlarson |
3.7 |
return(0); |
154 |
greg |
3.1 |
} |
155 |
|
|
if (isprims(s)) { |
156 |
|
|
primsval(rh->mypri, s); |
157 |
|
|
rh->primp = rh->mypri; |
158 |
gwlarson |
3.7 |
return(0); |
159 |
greg |
3.1 |
} |
160 |
gwlarson |
3.7 |
return(0); |
161 |
greg |
3.1 |
} |
162 |
|
|
|
163 |
|
|
|
164 |
|
|
int |
165 |
|
|
tmLoadPicture(lpp, cpp, xp, yp, fname, fp) /* convert Radiance picture */ |
166 |
|
|
TMbright **lpp; |
167 |
|
|
BYTE **cpp; |
168 |
|
|
int *xp, *yp; |
169 |
|
|
char *fname; |
170 |
|
|
FILE *fp; |
171 |
|
|
{ |
172 |
|
|
char *funcName = fname==NULL ? "tmLoadPicture" : fname; |
173 |
|
|
FILE *inpf; |
174 |
|
|
struct radhead info; |
175 |
|
|
int err; |
176 |
|
|
COLR *scanin = NULL; |
177 |
|
|
int i; |
178 |
|
|
/* check arguments */ |
179 |
|
|
if (tmTop == NULL) |
180 |
|
|
returnErr(TM_E_TMINVAL); |
181 |
|
|
if (lpp == NULL | xp == NULL | yp == NULL | |
182 |
|
|
(fname == NULL & fp == TM_GETFILE)) |
183 |
|
|
returnErr(TM_E_ILLEGAL); |
184 |
|
|
*xp = *yp = 0; /* error precaution */ |
185 |
|
|
if ((inpf = fp) == TM_GETFILE && (inpf = fopen(fname, "r")) == NULL) |
186 |
|
|
returnErr(TM_E_BADFILE); |
187 |
gwlarson |
3.6 |
*lpp = NULL; |
188 |
|
|
if (cpp != TM_NOCHROMP) *cpp = NULL; |
189 |
greg |
3.1 |
info = rhdefault; /* get our header */ |
190 |
gwlarson |
3.6 |
getheader(inpf, headline, (MEM_PTR)&info); |
191 |
greg |
3.1 |
if (info.format == FMTBAD | info.expos <= 0. || |
192 |
|
|
fgetresolu(xp, yp, inpf) < 0) { |
193 |
|
|
err = TM_E_BADFILE; goto done; |
194 |
|
|
} |
195 |
|
|
if (info.format == FMTUNK) /* assume RGBE format */ |
196 |
|
|
info.format = FMTRGB; |
197 |
|
|
if (info.format == FMTRGB) |
198 |
|
|
info.expos /= WHTEFFICACY; |
199 |
|
|
else if (info.format == FMTCIE) |
200 |
|
|
info.primp = TM_XYZPRIM; |
201 |
|
|
/* prepare library */ |
202 |
|
|
if ((err = tmSetSpace(info.primp, 1./info.expos)) != TM_E_OK) |
203 |
|
|
goto done; |
204 |
|
|
err = TM_E_NOMEM; /* allocate arrays */ |
205 |
|
|
*lpp = (TMbright *)malloc(sizeof(TMbright) * *xp * *yp); |
206 |
|
|
if (*lpp == NULL) |
207 |
|
|
goto done; |
208 |
|
|
if (cpp != TM_NOCHROMP) { |
209 |
|
|
*cpp = (BYTE *)malloc(3*sizeof(BYTE) * *xp * *yp); |
210 |
|
|
if (*cpp == NULL) |
211 |
|
|
goto done; |
212 |
|
|
} |
213 |
|
|
scanin = (COLR *)malloc(sizeof(COLR) * *xp); |
214 |
|
|
if (scanin == NULL) |
215 |
|
|
goto done; |
216 |
|
|
err = TM_E_BADFILE; /* read & convert scanlines */ |
217 |
|
|
for (i = 0; i < *yp; i++) { |
218 |
|
|
if (freadcolrs(scanin, *xp, inpf) < 0) { |
219 |
|
|
err = TM_E_BADFILE; break; |
220 |
|
|
} |
221 |
|
|
err = tmCvColrs(*lpp + (i * *xp), |
222 |
|
|
cpp==TM_NOCHROMP ? TM_NOCHROM : *cpp + (i * 3 * *xp), |
223 |
|
|
scanin, *xp); |
224 |
|
|
if (err != TM_E_OK) |
225 |
|
|
break; |
226 |
|
|
} |
227 |
|
|
done: /* clean up */ |
228 |
|
|
if (fp == NULL) |
229 |
|
|
fclose(inpf); |
230 |
|
|
if (scanin != NULL) |
231 |
gwlarson |
3.6 |
free((MEM_PTR)scanin); |
232 |
|
|
if (err != TM_E_OK) { |
233 |
|
|
if (*lpp != NULL) |
234 |
|
|
free((MEM_PTR)*lpp); |
235 |
|
|
if (cpp != TM_NOCHROMP && *cpp != NULL) |
236 |
|
|
free((MEM_PTR)*cpp); |
237 |
greg |
3.1 |
returnErr(err); |
238 |
gwlarson |
3.6 |
} |
239 |
greg |
3.1 |
returnOK; |
240 |
|
|
} |
241 |
|
|
|
242 |
|
|
|
243 |
|
|
int /* run pcond to map picture */ |
244 |
|
|
dopcond(psp, xp, yp, flags, monpri, gamval, Lddyn, Ldmax, fname) |
245 |
|
|
BYTE **psp; |
246 |
|
|
int *xp, *yp; |
247 |
|
|
int flags; |
248 |
|
|
RGBPRIMP monpri; |
249 |
|
|
double gamval, Lddyn, Ldmax; |
250 |
|
|
char *fname; |
251 |
|
|
{ |
252 |
|
|
char *funcName = fname; |
253 |
|
|
char cmdbuf[512]; |
254 |
|
|
FILE *infp; |
255 |
|
|
register COLR *scan; |
256 |
|
|
register BYTE *rp; |
257 |
|
|
int y; |
258 |
|
|
register int x; |
259 |
|
|
/* set up gamma correction */ |
260 |
|
|
if (setcolrcor(pow, 1./gamval) < 0) |
261 |
|
|
returnErr(TM_E_NOMEM); |
262 |
|
|
/* create command */ |
263 |
|
|
strcpy(cmdbuf, "pcond "); |
264 |
|
|
if (flags & TM_F_HCONTR) |
265 |
|
|
strcat(cmdbuf, "-s "); |
266 |
|
|
if (flags & TM_F_MESOPIC) |
267 |
|
|
strcat(cmdbuf, "-c "); |
268 |
|
|
if (flags & TM_F_LINEAR) |
269 |
|
|
strcat(cmdbuf, "-l "); |
270 |
|
|
if (flags & TM_F_ACUITY) |
271 |
|
|
strcat(cmdbuf, "-a "); |
272 |
|
|
if (flags & TM_F_VEIL) |
273 |
|
|
strcat(cmdbuf, "-v "); |
274 |
|
|
if (flags & TM_F_CWEIGHT) |
275 |
|
|
strcat(cmdbuf, "-w "); |
276 |
|
|
sprintf(cmdbuf+strlen(cmdbuf), |
277 |
|
|
"-p %f %f %f %f %f %f %f %f -d %f -u %f %s", |
278 |
|
|
monpri[RED][CIEX], monpri[RED][CIEY], |
279 |
|
|
monpri[GRN][CIEX], monpri[GRN][CIEY], |
280 |
|
|
monpri[BLU][CIEX], monpri[BLU][CIEY], |
281 |
|
|
monpri[WHT][CIEX], monpri[WHT][CIEY], |
282 |
|
|
Lddyn, Ldmax, fname); |
283 |
|
|
/* start pcond */ |
284 |
|
|
if ((infp = popen(cmdbuf, "r")) == NULL) |
285 |
|
|
returnErr(TM_E_BADFILE); |
286 |
|
|
/* check picture format and size */ |
287 |
|
|
if (checkheader(infp, COLRFMT, NULL) < 0 || |
288 |
|
|
fgetresolu(xp, yp, infp) < 0) { |
289 |
|
|
pclose(infp); |
290 |
|
|
returnErr(TM_E_BADFILE); |
291 |
|
|
} |
292 |
|
|
/* allocate arrays */ |
293 |
greg |
3.2 |
scan = (COLR *)malloc(sizeof(COLR) * *xp); |
294 |
greg |
3.1 |
if (flags & TM_F_BW) |
295 |
|
|
rp = (BYTE *)malloc(sizeof(BYTE) * *xp * *yp); |
296 |
|
|
else |
297 |
|
|
rp = (BYTE *)malloc(3*sizeof(BYTE) * *xp * *yp); |
298 |
|
|
if ((*psp = rp) == NULL | scan == NULL) { |
299 |
|
|
pclose(infp); |
300 |
|
|
returnErr(TM_E_NOMEM); |
301 |
|
|
} |
302 |
|
|
/* read and gamma map file */ |
303 |
|
|
for (y = 0; y < *yp; y++) { |
304 |
|
|
if (freadcolrs(scan, *xp, infp) < 0) { |
305 |
|
|
pclose(infp); |
306 |
gwlarson |
3.6 |
free((MEM_PTR)scan); |
307 |
|
|
free((MEM_PTR)*psp); |
308 |
greg |
3.2 |
*psp = NULL; |
309 |
greg |
3.1 |
returnErr(TM_E_BADFILE); |
310 |
|
|
} |
311 |
|
|
colrs_gambs(scan, *xp); |
312 |
|
|
if (flags & TM_F_BW) |
313 |
|
|
for (x = 0; x < *xp; x++) |
314 |
|
|
*rp++ = normbright(scan[x]); |
315 |
|
|
else |
316 |
|
|
for (x = 0; x < *xp; x++) { |
317 |
|
|
*rp++ = scan[x][RED]; |
318 |
|
|
*rp++ = scan[x][GRN]; |
319 |
|
|
*rp++ = scan[x][BLU]; |
320 |
|
|
} |
321 |
|
|
} |
322 |
gwlarson |
3.6 |
free((MEM_PTR)scan); |
323 |
greg |
3.1 |
pclose(infp); |
324 |
|
|
returnOK; |
325 |
|
|
} |
326 |
|
|
|
327 |
|
|
|
328 |
|
|
int /* map a Radiance picture */ |
329 |
|
|
tmMapPicture(psp, xp, yp, flags, monpri, gamval, Lddyn, Ldmax, fname, fp) |
330 |
|
|
BYTE **psp; |
331 |
|
|
int *xp, *yp; |
332 |
|
|
int flags; |
333 |
|
|
RGBPRIMP monpri; |
334 |
|
|
double gamval, Lddyn, Ldmax; |
335 |
|
|
char *fname; |
336 |
|
|
FILE *fp; |
337 |
|
|
{ |
338 |
|
|
char *funcName = fname==NULL ? "tmMapPicture" : fname; |
339 |
|
|
BYTE *cp; |
340 |
|
|
TMbright *lp; |
341 |
|
|
int err; |
342 |
|
|
/* check arguments */ |
343 |
|
|
if (psp == NULL | xp == NULL | yp == NULL | monpri == NULL | |
344 |
|
|
(fname == NULL & fp == TM_GETFILE)) |
345 |
|
|
returnErr(TM_E_ILLEGAL); |
346 |
|
|
/* set defaults */ |
347 |
|
|
if (gamval < MINGAM) gamval = DEFGAM; |
348 |
|
|
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
349 |
|
|
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
350 |
|
|
if (flags & TM_F_BW) monpri = stdprims; |
351 |
|
|
/* check for pcond run */ |
352 |
|
|
if (fp == TM_GETFILE && flags & TM_F_UNIMPL) |
353 |
|
|
return( dopcond(psp, xp, yp, flags, |
354 |
|
|
monpri, gamval, Lddyn, Ldmax, fname) ); |
355 |
|
|
/* initialize tone mapping */ |
356 |
|
|
if (tmInit(flags, monpri, gamval) == NULL) |
357 |
|
|
returnErr(TM_E_NOMEM); |
358 |
|
|
/* load & convert picture */ |
359 |
|
|
err = tmLoadPicture(&lp, (flags&TM_F_BW) ? TM_NOCHROMP : &cp, |
360 |
|
|
xp, yp, fname, fp); |
361 |
|
|
if (err != TM_E_OK) { |
362 |
|
|
tmDone(NULL); |
363 |
|
|
return(err); |
364 |
|
|
} |
365 |
|
|
/* allocate space for result */ |
366 |
|
|
if (flags & TM_F_BW) { |
367 |
|
|
*psp = (BYTE *)malloc(sizeof(BYTE) * *xp * *yp); |
368 |
greg |
3.2 |
if (*psp == NULL) { |
369 |
gwlarson |
3.6 |
free((MEM_PTR)lp); |
370 |
greg |
3.2 |
tmDone(NULL); |
371 |
greg |
3.1 |
returnErr(TM_E_NOMEM); |
372 |
greg |
3.2 |
} |
373 |
greg |
3.1 |
cp = TM_NOCHROM; |
374 |
|
|
} else |
375 |
|
|
*psp = cp; |
376 |
|
|
/* compute color mapping */ |
377 |
|
|
err = tmAddHisto(lp, *xp * *yp, 1); |
378 |
|
|
if (err != TM_E_OK) |
379 |
|
|
goto done; |
380 |
|
|
err = tmComputeMapping(gamval, Lddyn, Ldmax); |
381 |
|
|
if (err != TM_E_OK) |
382 |
|
|
goto done; |
383 |
|
|
/* map colors */ |
384 |
|
|
err = tmMapPixels(*psp, lp, cp, *xp * *yp); |
385 |
|
|
|
386 |
|
|
done: /* clean up */ |
387 |
gwlarson |
3.6 |
free((MEM_PTR)lp); |
388 |
greg |
3.1 |
tmDone(NULL); |
389 |
|
|
if (err != TM_E_OK) { /* free memory on error */ |
390 |
gwlarson |
3.6 |
free((MEM_PTR)*psp); |
391 |
greg |
3.1 |
*psp = NULL; |
392 |
|
|
returnErr(err); |
393 |
|
|
} |
394 |
|
|
returnOK; |
395 |
greg |
3.3 |
} |
396 |
|
|
|
397 |
|
|
|
398 |
|
|
static void |
399 |
|
|
colrNewSpace(tms) /* color space changed for tone mapping */ |
400 |
|
|
register struct tmStruct *tms; |
401 |
|
|
{ |
402 |
|
|
register COLRDATA *cd; |
403 |
|
|
double d; |
404 |
|
|
|
405 |
|
|
cd = (COLRDATA *)tms->pd[colrReg]; |
406 |
|
|
cd->clfb[RED] = 256.*tms->clf[RED] + .5; |
407 |
|
|
cd->clfb[GRN] = 256.*tms->clf[GRN] + .5; |
408 |
|
|
cd->clfb[BLU] = 256.*tms->clf[BLU] + .5; |
409 |
|
|
cd->clfb[EXP] = COLXS; |
410 |
|
|
d = TM_BRTSCALE*log(tms->inpsf); |
411 |
|
|
cd->inpsfb = d<0. ? d-.5 : d+.5; |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
|
415 |
|
|
static MEM_PTR |
416 |
|
|
colrInit(tms) /* initialize private data for tone mapping */ |
417 |
|
|
register struct tmStruct *tms; |
418 |
|
|
{ |
419 |
|
|
register COLRDATA *cd; |
420 |
|
|
register int i; |
421 |
|
|
/* allocate our data */ |
422 |
|
|
cd = (COLRDATA *)malloc(sizeof(COLRDATA)); |
423 |
|
|
if (cd == NULL) |
424 |
|
|
return(NULL); |
425 |
|
|
tms->pd[colrReg] = (MEM_PTR)cd; |
426 |
|
|
/* compute gamma table */ |
427 |
|
|
for (i = GAMTSZ; i--; ) |
428 |
|
|
cd->gamb[i] = 256.*pow((i+.5)/GAMTSZ, 1./tms->mongam); |
429 |
|
|
/* compute color and scale factors */ |
430 |
|
|
colrNewSpace(tms); |
431 |
|
|
return((MEM_PTR)cd); |
432 |
greg |
3.1 |
} |