1 |
greg |
3.1 |
/* Copyright (c) 1997 Regents of the University of California */ |
2 |
|
|
|
3 |
|
|
#ifndef lint |
4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
5 |
|
|
#endif |
6 |
|
|
|
7 |
|
|
/* |
8 |
|
|
* Tone mapping functions. |
9 |
|
|
* See tonemap.h for detailed function descriptions. |
10 |
|
|
*/ |
11 |
|
|
|
12 |
|
|
#include <stdio.h> |
13 |
|
|
#include <math.h> |
14 |
|
|
#include "tmprivat.h" |
15 |
|
|
#include "tmerrmsg.h" |
16 |
|
|
|
17 |
|
|
#define exp10(x) exp(M_LN10*(x)) |
18 |
|
|
|
19 |
|
|
struct tmStruct *tmTop = NULL; /* current tone mapping stack */ |
20 |
|
|
|
21 |
|
|
|
22 |
|
|
int |
23 |
|
|
tmErrorReturn(func, err) /* error return (with message) */ |
24 |
|
|
char *func; |
25 |
|
|
int err; |
26 |
|
|
{ |
27 |
greg |
3.2 |
if (tmTop != NULL && tmTop->flags & TM_F_NOSTDERR) |
28 |
greg |
3.1 |
return(err); |
29 |
|
|
fputs(func, stderr); |
30 |
|
|
fputs(": ", stderr); |
31 |
|
|
fputs(tmErrorMessage[err], stderr); |
32 |
|
|
fputs("!\n", stderr); |
33 |
|
|
return(err); |
34 |
|
|
} |
35 |
|
|
|
36 |
|
|
|
37 |
|
|
struct tmStruct * |
38 |
|
|
tmInit(flags, monpri, gamval) /* initialize new tone mapping */ |
39 |
|
|
int flags; |
40 |
|
|
RGBPRIMP monpri; |
41 |
|
|
double gamval; |
42 |
|
|
{ |
43 |
|
|
static char funcName[] = "tmInit"; |
44 |
|
|
COLORMAT cmat; |
45 |
|
|
register struct tmStruct *tmnew; |
46 |
|
|
register int i; |
47 |
|
|
/* allocate structure */ |
48 |
|
|
tmnew = (struct tmStruct *)malloc(sizeof(struct tmStruct)); |
49 |
|
|
if (tmnew == NULL) |
50 |
|
|
return(NULL); |
51 |
|
|
|
52 |
|
|
tmnew->flags = flags & ~TM_F_UNIMPL; |
53 |
|
|
/* set monitor transform */ |
54 |
|
|
if (monpri == NULL || monpri == stdprims || tmnew->flags & TM_F_BW) { |
55 |
|
|
tmnew->monpri = stdprims; |
56 |
|
|
tmnew->clf[RED] = rgb2xyzmat[1][0]; |
57 |
|
|
tmnew->clf[GRN] = rgb2xyzmat[1][1]; |
58 |
|
|
tmnew->clf[BLU] = rgb2xyzmat[1][2]; |
59 |
|
|
} else { |
60 |
|
|
comprgb2xyzmat(cmat, tmnew->monpri=monpri); |
61 |
|
|
tmnew->clf[RED] = cmat[1][0]; |
62 |
|
|
tmnew->clf[GRN] = cmat[1][1]; |
63 |
|
|
tmnew->clf[BLU] = cmat[1][2]; |
64 |
|
|
} |
65 |
|
|
tmnew->clfb[RED] = 256.*tmnew->clf[RED] + .5; |
66 |
|
|
tmnew->clfb[GRN] = 256.*tmnew->clf[GRN] + .5; |
67 |
|
|
tmnew->clfb[BLU] = 256.*tmnew->clf[BLU] + .5; |
68 |
|
|
tmnew->clfb[EXP] = COLXS; |
69 |
|
|
/* set gamma value */ |
70 |
|
|
if (gamval < MINGAM) |
71 |
|
|
tmnew->mongam = DEFGAM; |
72 |
|
|
else |
73 |
|
|
tmnew->mongam = gamval; |
74 |
|
|
for (i = TM_GAMTSZ; i--; ) |
75 |
|
|
tmnew->gamb[i] = 256.*pow((i+.5)/TM_GAMTSZ, 1./tmnew->mongam); |
76 |
|
|
/* set input transform */ |
77 |
|
|
tmnew->inppri = tmnew->monpri; |
78 |
|
|
tmnew->cmat[0][0] = tmnew->cmat[1][1] = tmnew->cmat[2][2] = |
79 |
|
|
tmnew->inpsf = WHTEFFICACY; |
80 |
|
|
tmnew->inpsfb = TM_BRTSCALE*log(tmnew->inpsf) + .5; |
81 |
|
|
tmnew->cmat[0][1] = tmnew->cmat[0][2] = tmnew->cmat[1][0] = |
82 |
|
|
tmnew->cmat[1][2] = tmnew->cmat[2][0] = tmnew->cmat[2][1] = 0.; |
83 |
|
|
tmnew->flags &= ~TM_F_NEEDMAT; |
84 |
|
|
tmnew->brmin = tmnew->brmax = 0; |
85 |
|
|
tmnew->histo = NULL; |
86 |
|
|
tmnew->lumap = NULL; |
87 |
|
|
tmnew->tmprev = NULL; |
88 |
|
|
|
89 |
|
|
tmnew->flags |= TM_F_INITED; |
90 |
|
|
/* make it current */ |
91 |
|
|
tmnew->tmprev = tmTop; |
92 |
|
|
return(tmTop = tmnew); |
93 |
|
|
} |
94 |
|
|
|
95 |
|
|
|
96 |
|
|
int |
97 |
|
|
tmSetSpace(pri, sf) /* set input color space for conversions */ |
98 |
|
|
RGBPRIMP pri; |
99 |
|
|
double sf; |
100 |
|
|
{ |
101 |
|
|
static char funcName[] = "tmSetSpace"; |
102 |
|
|
register int i, j; |
103 |
|
|
/* error check */ |
104 |
|
|
if (tmTop == NULL) |
105 |
|
|
returnErr(TM_E_TMINVAL); |
106 |
|
|
if (sf <= 1e-12) |
107 |
|
|
returnErr(TM_E_ILLEGAL); |
108 |
|
|
/* check if no change */ |
109 |
|
|
if (pri == tmTop->inppri && FEQ(sf, tmTop->inpsf)) |
110 |
|
|
returnOK; |
111 |
|
|
tmTop->inppri = pri; /* let's set it */ |
112 |
|
|
tmTop->inpsf = sf; |
113 |
|
|
tmTop->inpsfb = TM_BRTSCALE*log(sf) + (sf>=1. ? .5 : -.5); |
114 |
|
|
|
115 |
|
|
if (tmTop->flags & TM_F_BW) { /* color doesn't matter */ |
116 |
|
|
tmTop->monpri = tmTop->inppri; /* eliminate xform */ |
117 |
|
|
if (tmTop->inppri == TM_XYZPRIM) { |
118 |
|
|
tmTop->clf[CIEX] = tmTop->clf[CIEZ] = 0.; |
119 |
|
|
tmTop->clf[CIEY] = 1.; |
120 |
|
|
tmTop->clfb[CIEX] = tmTop->clfb[CIEZ] = 0; |
121 |
|
|
tmTop->clfb[CIEY] = 255; |
122 |
|
|
} else { |
123 |
|
|
comprgb2xyzmat(tmTop->cmat, tmTop->monpri); |
124 |
|
|
tmTop->clf[RED] = tmTop->cmat[1][0]; |
125 |
|
|
tmTop->clf[GRN] = tmTop->cmat[1][1]; |
126 |
|
|
tmTop->clf[BLU] = tmTop->cmat[1][2]; |
127 |
|
|
} |
128 |
|
|
tmTop->cmat[0][0] = tmTop->cmat[1][1] = tmTop->cmat[2][2] = |
129 |
|
|
tmTop->inpsf; |
130 |
|
|
tmTop->cmat[0][1] = tmTop->cmat[0][2] = tmTop->cmat[1][0] = |
131 |
|
|
tmTop->cmat[1][2] = tmTop->cmat[2][0] = tmTop->cmat[2][1] = 0.; |
132 |
|
|
|
133 |
|
|
} else if (tmTop->inppri == TM_XYZPRIM) /* input is XYZ */ |
134 |
|
|
compxyz2rgbmat(tmTop->cmat, tmTop->monpri); |
135 |
|
|
|
136 |
|
|
else { /* input is RGB */ |
137 |
|
|
if (tmTop->inppri != tmTop->monpri && |
138 |
|
|
PRIMEQ(tmTop->inppri, tmTop->monpri)) |
139 |
|
|
tmTop->inppri = tmTop->monpri; /* no xform */ |
140 |
|
|
comprgb2rgbmat(tmTop->cmat, tmTop->inppri, tmTop->monpri); |
141 |
|
|
} |
142 |
|
|
for (i = 0; i < 3; i++) |
143 |
|
|
for (j = 0; j < 3; j++) |
144 |
|
|
tmTop->cmat[i][j] *= tmTop->inpsf; |
145 |
|
|
if (tmTop->inppri != tmTop->monpri) |
146 |
|
|
tmTop->flags |= TM_F_NEEDMAT; |
147 |
|
|
else |
148 |
|
|
tmTop->flags &= ~TM_F_NEEDMAT; |
149 |
|
|
returnOK; |
150 |
|
|
} |
151 |
|
|
|
152 |
|
|
|
153 |
|
|
void |
154 |
|
|
tmClearHisto() /* clear current histogram */ |
155 |
|
|
{ |
156 |
|
|
if (tmTop == NULL || tmTop->histo == NULL) |
157 |
|
|
return; |
158 |
|
|
free((char *)tmTop->histo); |
159 |
|
|
tmTop->histo = NULL; |
160 |
|
|
} |
161 |
|
|
|
162 |
|
|
|
163 |
|
|
int |
164 |
|
|
tmCvColors(ls, cs, scan, len) /* convert float colors */ |
165 |
|
|
TMbright *ls; |
166 |
|
|
BYTE *cs; |
167 |
|
|
COLOR *scan; |
168 |
|
|
int len; |
169 |
|
|
{ |
170 |
|
|
static char funcName[] = "tmCvColors"; |
171 |
|
|
COLOR cmon; |
172 |
|
|
double lum, slum; |
173 |
|
|
register double d; |
174 |
|
|
register int i; |
175 |
|
|
|
176 |
|
|
if (tmTop == NULL) |
177 |
|
|
returnErr(TM_E_TMINVAL); |
178 |
|
|
if (ls == NULL | scan == NULL | len <= 0) |
179 |
|
|
returnErr(TM_E_ILLEGAL); |
180 |
|
|
for (i = len; i--; ) { |
181 |
|
|
if (tmTop->flags & TM_F_NEEDMAT) /* get monitor RGB */ |
182 |
|
|
colortrans(cmon, tmTop->cmat, scan[i]); |
183 |
|
|
else { |
184 |
|
|
cmon[RED] = tmTop->inpsf*scan[i][RED]; |
185 |
|
|
cmon[GRN] = tmTop->inpsf*scan[i][GRN]; |
186 |
|
|
cmon[BLU] = tmTop->inpsf*scan[i][BLU]; |
187 |
|
|
} |
188 |
|
|
/* world luminance */ |
189 |
|
|
lum = tmTop->clf[RED]*cmon[RED] + |
190 |
|
|
tmTop->clf[GRN]*cmon[GRN] + |
191 |
|
|
tmTop->clf[BLU]*cmon[BLU] ; |
192 |
|
|
/* check range */ |
193 |
|
|
if (clipgamut(cmon, lum, CGAMUT_LOWER, cblack, cwhite)) |
194 |
|
|
lum = tmTop->clf[RED]*cmon[RED] + |
195 |
|
|
tmTop->clf[GRN]*cmon[GRN] + |
196 |
|
|
tmTop->clf[BLU]*cmon[BLU] ; |
197 |
|
|
if (lum < MINLUM) { |
198 |
|
|
ls[i] = MINBRT-1; /* bogus value */ |
199 |
|
|
lum = MINLUM; |
200 |
|
|
} else { |
201 |
|
|
d = TM_BRTSCALE*log(lum); /* encode it */ |
202 |
|
|
ls[i] = d>0. ? (int)(d+.5) : (int)(d-.5); |
203 |
|
|
} |
204 |
|
|
if (cs == TM_NOCHROM) /* no color? */ |
205 |
|
|
continue; |
206 |
|
|
if (tmTop->flags & TM_F_MESOPIC && lum < LMESUPPER) { |
207 |
|
|
slum = scotlum(cmon); /* mesopic adj. */ |
208 |
|
|
if (lum < LMESLOWER) |
209 |
|
|
cmon[RED] = cmon[GRN] = cmon[BLU] = slum; |
210 |
|
|
else { |
211 |
|
|
d = (lum - LMESLOWER)/(LMESUPPER - LMESLOWER); |
212 |
|
|
if (tmTop->flags & TM_F_BW) |
213 |
|
|
cmon[RED] = cmon[GRN] = |
214 |
|
|
cmon[BLU] = d*lum; |
215 |
|
|
else |
216 |
|
|
scalecolor(cmon, d); |
217 |
|
|
d = (1.-d)*slum; |
218 |
|
|
cmon[RED] += d; |
219 |
|
|
cmon[GRN] += d; |
220 |
|
|
cmon[BLU] += d; |
221 |
|
|
} |
222 |
|
|
} else if (tmTop->flags & TM_F_BW) { |
223 |
|
|
cmon[RED] = cmon[GRN] = cmon[BLU] = lum; |
224 |
|
|
} |
225 |
|
|
d = tmTop->clf[RED]*cmon[RED]/lum; |
226 |
|
|
/* cs[3*i ] = d>.999 ? 255 : 256.*pow(d, 1./tmTop->mongam); */ |
227 |
|
|
cs[3*i ] = d>.999 ? 255 : tmTop->gamb[(int)(d*TM_GAMTSZ)]; |
228 |
|
|
d = tmTop->clf[GRN]*cmon[GRN]/lum; |
229 |
|
|
/* cs[3*i+1] = d>.999 ? 255 : 256.*pow(d, 1./tmTop->mongam); */ |
230 |
|
|
cs[3*i+1] = d>.999 ? 255 : tmTop->gamb[(int)(d*TM_GAMTSZ)]; |
231 |
|
|
d = tmTop->clf[BLU]*cmon[BLU]/lum; |
232 |
|
|
/* cs[3*i+2] = d>.999 ? 255 : 256.*pow(d, 1./tmTop->mongam); */ |
233 |
|
|
cs[3*i+2] = d>.999 ? 255 : tmTop->gamb[(int)(d*TM_GAMTSZ)]; |
234 |
|
|
} |
235 |
|
|
returnOK; |
236 |
|
|
} |
237 |
|
|
|
238 |
|
|
|
239 |
|
|
int |
240 |
|
|
tmAddHisto(ls, len, wt) /* add values to histogram */ |
241 |
|
|
register TMbright *ls; |
242 |
|
|
int len; |
243 |
|
|
int wt; |
244 |
|
|
{ |
245 |
|
|
static char funcName[] = "tmAddHisto"; |
246 |
|
|
int sum, oldorig, oldlen, horig, hlen; |
247 |
|
|
register int i, j; |
248 |
|
|
|
249 |
|
|
if (len <= 0) |
250 |
|
|
returnErr(TM_E_ILLEGAL); |
251 |
|
|
if (tmTop == NULL) |
252 |
|
|
returnErr(TM_E_TMINVAL); |
253 |
|
|
/* first, grow limits */ |
254 |
|
|
if (tmTop->histo == NULL) { |
255 |
|
|
for (i = len; i-- && ls[i] < MINBRT; ) |
256 |
|
|
; |
257 |
|
|
if (i < 0) |
258 |
|
|
returnOK; |
259 |
|
|
tmTop->brmin = tmTop->brmax = ls[i]; |
260 |
|
|
oldlen = 0; |
261 |
|
|
} else { |
262 |
|
|
oldorig = (tmTop->brmin-MINBRT)/HISTEP; |
263 |
|
|
oldlen = (tmTop->brmax-MINBRT)/HISTEP + 1 - oldorig; |
264 |
|
|
} |
265 |
|
|
for (i = len; i--; ) { |
266 |
|
|
if ((j = ls[i]) < MINBRT) |
267 |
|
|
continue; |
268 |
|
|
if (j < tmTop->brmin) |
269 |
|
|
tmTop->brmin = j; |
270 |
|
|
else if (j > tmTop->brmax) |
271 |
|
|
tmTop->brmax = j; |
272 |
|
|
} |
273 |
|
|
horig = (tmTop->brmin-MINBRT)/HISTEP; |
274 |
|
|
hlen = (tmTop->brmax-MINBRT)/HISTEP + 1 - horig; |
275 |
|
|
if (hlen > oldlen) { /* (re)allocate histogram */ |
276 |
|
|
register int *newhist = (int *)calloc(hlen, sizeof(int)); |
277 |
|
|
if (newhist == NULL) |
278 |
|
|
returnErr(TM_E_NOMEM); |
279 |
|
|
if (oldlen) { /* copy and free old */ |
280 |
greg |
3.2 |
for (i = oldlen, j = i+oldorig-horig; i; ) |
281 |
|
|
newhist[--j] = tmTop->histo[--i]; |
282 |
greg |
3.1 |
free((char *)tmTop->histo); |
283 |
|
|
} |
284 |
|
|
tmTop->histo = newhist; |
285 |
|
|
if (tmTop->lumap != NULL) { /* invalid tone map */ |
286 |
|
|
free((char *)tmTop->lumap); |
287 |
|
|
tmTop->lumap = NULL; |
288 |
|
|
} |
289 |
|
|
} |
290 |
|
|
if (wt == 0) |
291 |
|
|
returnOK; |
292 |
|
|
for (i = len; i--; ) /* add in new counts */ |
293 |
|
|
if (ls[i] >= MINBRT) |
294 |
|
|
tmTop->histo[ (ls[i]-MINBRT)/HISTEP - horig ] += wt; |
295 |
|
|
returnOK; |
296 |
|
|
} |
297 |
|
|
|
298 |
|
|
|
299 |
|
|
static double |
300 |
|
|
htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
301 |
|
|
double La; |
302 |
|
|
{ |
303 |
|
|
double l10La, l10dL; |
304 |
|
|
/* formula taken from Ferwerda et al. [SG96] */ |
305 |
|
|
if (La < 1.148e-4) |
306 |
|
|
return(1.38e-3); |
307 |
|
|
l10La = log10(La); |
308 |
|
|
if (l10La < -1.44) /* rod response regime */ |
309 |
|
|
l10dL = pow(.405*l10La + 1.6, 2.18) - 2.86; |
310 |
|
|
else if (l10La < -.0184) |
311 |
|
|
l10dL = l10La - .395; |
312 |
|
|
else if (l10La < 1.9) /* cone response regime */ |
313 |
|
|
l10dL = pow(.249*l10La + .65, 2.7) - .72; |
314 |
|
|
else |
315 |
|
|
l10dL = l10La - 1.255; |
316 |
|
|
|
317 |
|
|
return(exp10(l10dL)); |
318 |
|
|
} |
319 |
|
|
|
320 |
|
|
|
321 |
|
|
int |
322 |
|
|
tmComputeMapping(gamval, Lddyn, Ldmax) |
323 |
|
|
double gamval; |
324 |
|
|
double Lddyn; |
325 |
|
|
double Ldmax; |
326 |
|
|
{ |
327 |
|
|
static char funcName[] = "tmComputeMapping"; |
328 |
|
|
int *histo; |
329 |
|
|
float *cumf; |
330 |
|
|
int brt0, histlen, histot, threshold, ceiling, trimmings; |
331 |
|
|
double logLddyn, Ldmin, Ldavg, Lwavg, Tr, Lw, Ld; |
332 |
|
|
int4 sum; |
333 |
|
|
register double d; |
334 |
|
|
register int i, j; |
335 |
|
|
|
336 |
|
|
if (tmTop == NULL || tmTop->histo == NULL) |
337 |
|
|
returnErr(TM_E_TMINVAL); |
338 |
|
|
/* check arguments */ |
339 |
|
|
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
340 |
|
|
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
341 |
|
|
if (gamval < MINGAM) gamval = tmTop->mongam; |
342 |
|
|
/* compute handy values */ |
343 |
|
|
Ldmin = Ldmax/Lddyn; |
344 |
|
|
logLddyn = log(Lddyn); |
345 |
|
|
Ldavg = sqrt(Ldmax*Ldmin); |
346 |
|
|
i = (tmTop->brmin-MINBRT)/HISTEP; |
347 |
|
|
brt0 = MINBRT + HISTEP/2 + i*HISTEP; |
348 |
|
|
histlen = (tmTop->brmax-MINBRT)/HISTEP + 1 - i; |
349 |
|
|
/* histogram total and mean */ |
350 |
|
|
histot = 0; sum = 0; |
351 |
|
|
j = brt0 + histlen*HISTEP; |
352 |
|
|
for (i = histlen; i--; ) { |
353 |
greg |
3.2 |
histot += tmTop->histo[i]; |
354 |
|
|
sum += (j -= HISTEP) * tmTop->histo[i]; |
355 |
greg |
3.1 |
} |
356 |
|
|
threshold = histot*.025 + .5; |
357 |
|
|
if (threshold < 4) |
358 |
|
|
returnErr(TM_E_TMFAIL); |
359 |
|
|
Lwavg = tmLuminance( (double)sum / histot ); |
360 |
greg |
3.2 |
if (!(tmTop->flags & TM_F_LINEAR)) { /* clamp histogram */ |
361 |
|
|
histo = (int *)malloc(histlen*sizeof(int)); |
362 |
|
|
cumf = (float *)malloc((histlen+1)*sizeof(float)); |
363 |
|
|
if (histo == NULL | cumf == NULL) |
364 |
|
|
returnErr(TM_E_NOMEM); |
365 |
|
|
for (i = histlen; i--; ) /* make malleable copy */ |
366 |
|
|
histo[i] = tmTop->histo[i]; |
367 |
|
|
do { /* iterate to solution */ |
368 |
|
|
sum = 0; /* cumulative probability */ |
369 |
|
|
for (i = 0; i < histlen; i++) { |
370 |
|
|
cumf[i] = (double)sum/histot; |
371 |
|
|
sum += histo[i]; |
372 |
|
|
} |
373 |
|
|
cumf[i] = 1.; |
374 |
|
|
Tr = histot * (double)(tmTop->brmax - tmTop->brmin) / |
375 |
greg |
3.1 |
((double)histlen*TM_BRTSCALE) / logLddyn; |
376 |
greg |
3.2 |
ceiling = Tr + 1.; |
377 |
|
|
trimmings = 0; /* clip to envelope */ |
378 |
|
|
for (i = histlen; i--; ) { |
379 |
|
|
if (tmTop->flags & TM_F_HCONTR) { |
380 |
|
|
Lw = tmLuminance(brt0 + i*HISTEP); |
381 |
|
|
Ld = Ldmin * exp( logLddyn * |
382 |
greg |
3.1 |
.5*(cumf[i]+cumf[i+1]) ); |
383 |
greg |
3.2 |
ceiling = Tr * (htcontrs(Ld) * Lw) / |
384 |
greg |
3.1 |
(htcontrs(Lw) * Ld) + 1.; |
385 |
greg |
3.2 |
} |
386 |
|
|
if (histo[i] > ceiling) { |
387 |
|
|
trimmings += histo[i] - ceiling; |
388 |
|
|
histo[i] = ceiling; |
389 |
|
|
} |
390 |
greg |
3.1 |
} |
391 |
greg |
3.2 |
} while ((histot -= trimmings) > threshold && |
392 |
|
|
trimmings > threshold); |
393 |
|
|
} |
394 |
|
|
/* allocate luminance map */ |
395 |
|
|
if (tmTop->lumap == NULL) { |
396 |
greg |
3.1 |
tmTop->lumap = (unsigned short *)malloc( |
397 |
|
|
(tmTop->brmax-tmTop->brmin+1)*sizeof(unsigned short) ); |
398 |
|
|
if (tmTop->lumap == NULL) |
399 |
|
|
returnErr(TM_E_NOMEM); |
400 |
|
|
} |
401 |
|
|
if (tmTop->flags & TM_F_LINEAR || histot <= threshold) { |
402 |
|
|
/* linear tone mapping */ |
403 |
|
|
if (tmTop->flags & TM_F_HCONTR) |
404 |
|
|
d = htcontrs(Ldavg) / htcontrs(Lwavg); |
405 |
|
|
else |
406 |
|
|
d = Ldavg / Lwavg; |
407 |
|
|
d = log(d/Ldmax); |
408 |
|
|
for (i = tmTop->brmax-tmTop->brmin+1; i--; ) |
409 |
|
|
tmTop->lumap[i] = 256. * exp( |
410 |
|
|
( d + (tmTop->brmin+i)/(double)TM_BRTSCALE ) |
411 |
|
|
/ gamval ); |
412 |
|
|
} else { |
413 |
|
|
/* histogram adjustment */ |
414 |
|
|
for (i = tmTop->brmax-tmTop->brmin+1; i--; ) { |
415 |
|
|
j = d = (double)i/(tmTop->brmax-tmTop->brmin)*histlen; |
416 |
|
|
d -= (double)j; |
417 |
|
|
Ld = Ldmin*exp(logLddyn*((1.-d)*cumf[j]+d*cumf[j+1])); |
418 |
|
|
d = (Ld - Ldmin)/(Ldmax - Ldmin); |
419 |
|
|
tmTop->lumap[i] = 256.*pow(d, 1./gamval); |
420 |
|
|
} |
421 |
|
|
} |
422 |
greg |
3.2 |
if (!(tmTop->flags & TM_F_LINEAR)) { |
423 |
|
|
free((char *)histo); |
424 |
|
|
free((char *)cumf); |
425 |
|
|
} |
426 |
greg |
3.1 |
returnOK; |
427 |
|
|
} |
428 |
|
|
|
429 |
|
|
|
430 |
|
|
int |
431 |
|
|
tmMapPixels(ps, ls, cs, len) |
432 |
|
|
register BYTE *ps; |
433 |
|
|
TMbright *ls; |
434 |
|
|
register BYTE *cs; |
435 |
|
|
int len; |
436 |
|
|
{ |
437 |
|
|
static char funcName[] = "tmMapPixels"; |
438 |
|
|
int rdiv, gdiv, bdiv; |
439 |
|
|
register int li, pv; |
440 |
|
|
|
441 |
|
|
if (tmTop == NULL || tmTop->lumap == NULL) |
442 |
|
|
returnErr(TM_E_TMINVAL); |
443 |
|
|
if (ps == NULL | ls == NULL | len <= 0) |
444 |
|
|
returnErr(TM_E_ILLEGAL); |
445 |
|
|
rdiv = tmTop->gamb[((int4)TM_GAMTSZ*tmTop->clfb[RED])>>8]; |
446 |
|
|
gdiv = tmTop->gamb[((int4)TM_GAMTSZ*tmTop->clfb[GRN])>>8]; |
447 |
|
|
bdiv = tmTop->gamb[((int4)TM_GAMTSZ*tmTop->clfb[BLU])>>8]; |
448 |
|
|
while (len--) { |
449 |
|
|
if ((li = *ls++) < tmTop->brmin) |
450 |
|
|
li = tmTop->brmin; |
451 |
|
|
else if (li > tmTop->brmax) |
452 |
|
|
li = tmTop->brmax; |
453 |
|
|
li = tmTop->lumap[li - tmTop->brmin]; |
454 |
|
|
if (cs == TM_NOCHROM) |
455 |
|
|
*ps++ = li>255 ? 255 : li; |
456 |
|
|
else { |
457 |
|
|
pv = *cs++ * li / rdiv; |
458 |
|
|
*ps++ = pv>255 ? 255 : pv; |
459 |
|
|
pv = *cs++ * li / gdiv; |
460 |
|
|
*ps++ = pv>255 ? 255 : pv; |
461 |
|
|
pv = *cs++ * li / bdiv; |
462 |
|
|
*ps++ = pv>255 ? 255 : pv; |
463 |
|
|
} |
464 |
|
|
} |
465 |
|
|
returnOK; |
466 |
|
|
} |
467 |
|
|
|
468 |
|
|
|
469 |
|
|
struct tmStruct * |
470 |
|
|
tmPop() /* pop top tone mapping off stack */ |
471 |
|
|
{ |
472 |
|
|
register struct tmStruct *tms; |
473 |
|
|
|
474 |
|
|
if ((tms = tmTop) != NULL) |
475 |
|
|
tmTop = tms->tmprev; |
476 |
|
|
return(tms); |
477 |
|
|
} |
478 |
|
|
|
479 |
|
|
|
480 |
|
|
int |
481 |
|
|
tmPull(tms) /* pull a tone mapping from stack */ |
482 |
|
|
register struct tmStruct *tms; |
483 |
|
|
{ |
484 |
|
|
register struct tmStruct *tms2; |
485 |
|
|
/* special cases first */ |
486 |
|
|
if (tms == NULL | tmTop == NULL) |
487 |
|
|
return(0); |
488 |
|
|
if (tms == tmTop) { |
489 |
|
|
tmTop = tms->tmprev; |
490 |
|
|
tms->tmprev = NULL; |
491 |
|
|
return(1); |
492 |
|
|
} |
493 |
|
|
for (tms2 = tmTop; tms2->tmprev != NULL; tms2 = tms2->tmprev) |
494 |
|
|
if (tms == tms2->tmprev) { /* remove it */ |
495 |
|
|
tms2->tmprev = tms->tmprev; |
496 |
|
|
tms->tmprev = NULL; |
497 |
|
|
return(1); |
498 |
|
|
} |
499 |
|
|
return(0); /* not found on stack */ |
500 |
|
|
} |
501 |
|
|
|
502 |
|
|
|
503 |
greg |
3.3 |
struct tmStruct * |
504 |
|
|
tmDup() /* duplicate top tone mapping */ |
505 |
|
|
{ |
506 |
|
|
int len; |
507 |
|
|
register int i; |
508 |
|
|
register struct tmStruct *tmnew; |
509 |
|
|
|
510 |
|
|
if (tmTop == NULL) /* anything to duplicate? */ |
511 |
|
|
return(NULL); |
512 |
|
|
tmnew = (struct tmStruct *)malloc(sizeof(struct tmStruct)); |
513 |
|
|
if (tmnew == NULL) |
514 |
|
|
return(NULL); |
515 |
|
|
*tmnew = *tmTop; /* copy everything */ |
516 |
|
|
if (tmnew->histo != NULL) { /* duplicate histogram */ |
517 |
|
|
len = (tmnew->brmax-MINBRT)/HISTEP + 1 - |
518 |
|
|
(tmnew->brmin-MINBRT)/HISTEP; |
519 |
|
|
tmnew->histo = (int *)malloc(len*sizeof(int)); |
520 |
|
|
if (tmnew->histo != NULL) |
521 |
|
|
for (i = len; i--; ) |
522 |
|
|
tmnew->histo[i] = tmTop->histo[i]; |
523 |
|
|
} |
524 |
|
|
if (tmnew->lumap != NULL) { /* duplicate luminance mapping */ |
525 |
|
|
len = tmnew->brmax-tmnew->brmin+1; |
526 |
|
|
tmnew->lumap = (unsigned short *)malloc( |
527 |
|
|
len*sizeof(unsigned short) ); |
528 |
|
|
if (tmnew->lumap != NULL) |
529 |
|
|
for (i = len; i--; ) |
530 |
|
|
tmnew->lumap[i] = tmTop->lumap[i]; |
531 |
|
|
} |
532 |
|
|
tmnew->tmprev = tmTop; /* make copy current */ |
533 |
|
|
return(tmTop = tmnew); |
534 |
|
|
} |
535 |
|
|
|
536 |
|
|
|
537 |
greg |
3.1 |
int |
538 |
|
|
tmPush(tms) /* push tone mapping on top of stack */ |
539 |
|
|
register struct tmStruct *tms; |
540 |
|
|
{ |
541 |
|
|
static char funcName[] = "tmPush"; |
542 |
|
|
/* check validity */ |
543 |
|
|
if (tms == NULL || !(tms->flags & TM_F_INITED)) |
544 |
|
|
returnErr(TM_E_ILLEGAL); |
545 |
|
|
if (tms == tmTop) /* check necessity */ |
546 |
|
|
returnOK; |
547 |
|
|
/* pull if already in stack */ |
548 |
|
|
(void)tmPull(tms); |
549 |
|
|
/* push it on top */ |
550 |
|
|
tms->tmprev = tmTop; |
551 |
|
|
tmTop = tms; |
552 |
|
|
returnOK; |
553 |
|
|
} |
554 |
|
|
|
555 |
|
|
|
556 |
|
|
void |
557 |
|
|
tmDone(tms) /* done with tone mapping -- destroy it */ |
558 |
|
|
register struct tmStruct *tms; |
559 |
|
|
{ |
560 |
|
|
/* NULL arg. is equiv. to tmTop */ |
561 |
|
|
if (tms == NULL && (tms = tmTop) == NULL) |
562 |
|
|
return; |
563 |
|
|
/* take out of stack if present */ |
564 |
|
|
(void)tmPull(tms); |
565 |
|
|
/* free tables */ |
566 |
|
|
if (tms->histo != NULL) |
567 |
|
|
free((char *)tms->histo); |
568 |
|
|
if (tms->lumap != NULL) |
569 |
|
|
free((char *)tms->lumap); |
570 |
|
|
tms->flags = 0; |
571 |
|
|
free((char *)tms); /* free basic structure */ |
572 |
|
|
} |