1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: tonemap.c,v 3.19 2005/11/15 06:53:00 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Tone mapping functions. |
6 |
* See tonemap.h for detailed function descriptions. |
7 |
* Added von Kries white-balance calculations 10/01 (GW). |
8 |
* |
9 |
* Externals declared in tonemap.h |
10 |
*/ |
11 |
|
12 |
#include "copyright.h" |
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|
14 |
#include <stdio.h> |
15 |
#include <math.h> |
16 |
#include "tmprivat.h" |
17 |
#include "tmerrmsg.h" |
18 |
|
19 |
#define exp10(x) exp(M_LN10*(x)) |
20 |
|
21 |
/* our list of conversion packages */ |
22 |
struct tmPackage *tmPkg[TM_MAXPKG]; |
23 |
int tmNumPkgs = 0; /* number of registered packages */ |
24 |
|
25 |
|
26 |
TMstruct * |
27 |
tmInit( /* initialize new tone mapping */ |
28 |
int flags, |
29 |
RGBPRIMP monpri, |
30 |
double gamval |
31 |
) |
32 |
{ |
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COLORMAT cmat; |
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TMstruct *tmnew; |
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int i; |
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/* allocate structure */ |
37 |
tmnew = (TMstruct *)malloc(sizeof(TMstruct)); |
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if (tmnew == NULL) |
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return(NULL); |
40 |
|
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tmnew->flags = flags & ~TM_F_UNIMPL; |
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if (tmnew->flags & TM_F_BW) |
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tmnew->flags &= ~TM_F_MESOPIC; |
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/* set monitor transform */ |
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if (monpri == NULL || monpri == stdprims || tmnew->flags & TM_F_BW) { |
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tmnew->monpri = stdprims; |
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tmnew->clf[RED] = rgb2xyzmat[1][0]; |
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tmnew->clf[GRN] = rgb2xyzmat[1][1]; |
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tmnew->clf[BLU] = rgb2xyzmat[1][2]; |
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} else { |
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comprgb2xyzWBmat(cmat, tmnew->monpri=monpri); |
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tmnew->clf[RED] = cmat[1][0]; |
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tmnew->clf[GRN] = cmat[1][1]; |
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tmnew->clf[BLU] = cmat[1][2]; |
55 |
} |
56 |
/* set gamma value */ |
57 |
if (gamval < MINGAM) |
58 |
tmnew->mongam = DEFGAM; |
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else |
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tmnew->mongam = gamval; |
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/* set color divisors */ |
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for (i = 0; i < 3; i++) |
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tmnew->cdiv[i] = 256.*pow(tmnew->clf[i], 1./tmnew->mongam); |
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|
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/* set input transform */ |
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tmnew->inppri = tmnew->monpri; |
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tmnew->cmat[0][0] = tmnew->cmat[1][1] = tmnew->cmat[2][2] = |
68 |
tmnew->inpsf = WHTEFFICACY; |
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tmnew->cmat[0][1] = tmnew->cmat[0][2] = tmnew->cmat[1][0] = |
70 |
tmnew->cmat[1][2] = tmnew->cmat[2][0] = tmnew->cmat[2][1] = 0.; |
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tmnew->inpdat = NULL; |
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tmnew->hbrmin = 10; tmnew->hbrmax = -10; |
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tmnew->histo = NULL; |
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tmnew->mbrmin = 10; tmnew->mbrmax = -10; |
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tmnew->lumap = NULL; |
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/* zero private data */ |
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for (i = TM_MAXPKG; i--; ) |
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tmnew->pd[i] = NULL; |
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tmnew->lastError = TM_E_OK; |
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tmnew->lastFunc = "NoErr"; |
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/* return new TMstruct */ |
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return(tmnew); |
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} |
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|
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|
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int |
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tmSetSpace( /* set input color space for conversions */ |
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TMstruct *tms, |
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RGBPRIMP pri, |
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double sf, |
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MEM_PTR dat |
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) |
93 |
{ |
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static const char funcName[] = "tmSetSpace"; |
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int i, j; |
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/* error check */ |
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if (tms == NULL) |
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returnErr(TM_E_TMINVAL); |
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if (sf <= 1e-12) |
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returnErr(TM_E_ILLEGAL); |
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/* check if no change */ |
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if (pri == tms->inppri && FEQ(sf, tms->inpsf) && dat == tms->inpdat) |
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returnOK; |
104 |
tms->inppri = pri; /* let's set it */ |
105 |
tms->inpsf = sf; |
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tms->inpdat = dat; |
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|
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if (tms->flags & TM_F_BW) { /* color doesn't matter */ |
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tms->monpri = tms->inppri; /* eliminate xform */ |
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if (tms->inppri == TM_XYZPRIM) { |
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tms->clf[CIEX] = tms->clf[CIEZ] = 0.; |
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tms->clf[CIEY] = 1.; |
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} else { |
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comprgb2xyzWBmat(tms->cmat, tms->monpri); |
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tms->clf[RED] = tms->cmat[1][0]; |
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tms->clf[GRN] = tms->cmat[1][1]; |
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tms->clf[BLU] = tms->cmat[1][2]; |
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} |
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tms->cmat[0][0] = tms->cmat[1][1] = tms->cmat[2][2] = |
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tms->inpsf; |
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tms->cmat[0][1] = tms->cmat[0][2] = tms->cmat[1][0] = |
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tms->cmat[1][2] = tms->cmat[2][0] = tms->cmat[2][1] = 0.; |
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|
124 |
} else if (tms->inppri == TM_XYZPRIM) /* input is XYZ */ |
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compxyz2rgbWBmat(tms->cmat, tms->monpri); |
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|
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else { /* input is RGB */ |
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if (tms->inppri != tms->monpri && |
129 |
PRIMEQ(tms->inppri, tms->monpri)) |
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tms->inppri = tms->monpri; /* no xform */ |
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comprgb2rgbWBmat(tms->cmat, tms->inppri, tms->monpri); |
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} |
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for (i = 0; i < 3; i++) |
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for (j = 0; j < 3; j++) |
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tms->cmat[i][j] *= tms->inpsf; |
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/* set color divisors */ |
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for (i = 0; i < 3; i++) |
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if (tms->clf[i] > .001) |
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tms->cdiv[i] = |
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256.*pow(tms->clf[i], 1./tms->mongam); |
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else |
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tms->cdiv[i] = 1; |
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/* notify packages */ |
144 |
for (i = tmNumPkgs; i--; ) |
145 |
if (tms->pd[i] != NULL && tmPkg[i]->NewSpace != NULL) |
146 |
(*tmPkg[i]->NewSpace)(tms); |
147 |
returnOK; |
148 |
} |
149 |
|
150 |
|
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void |
152 |
tmClearHisto( /* clear current histogram */ |
153 |
TMstruct *tms |
154 |
) |
155 |
{ |
156 |
if (tms == NULL || tms->histo == NULL) |
157 |
return; |
158 |
free((MEM_PTR)tms->histo); |
159 |
tms->histo = NULL; |
160 |
} |
161 |
|
162 |
|
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int |
164 |
tmCvColors( /* convert float colors */ |
165 |
TMstruct *tms, |
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TMbright *ls, |
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BYTE *cs, |
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COLOR *scan, |
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int len |
170 |
) |
171 |
{ |
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static const char funcName[] = "tmCvColors"; |
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static COLOR csmall = {.5*MINLUM, .5*MINLUM, .5*MINLUM}; |
174 |
static BYTE gamtab[1024]; |
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static double curgam = .0; |
176 |
COLOR cmon; |
177 |
double lum, slum; |
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double d; |
179 |
int i; |
180 |
|
181 |
if (tms == NULL) |
182 |
returnErr(TM_E_TMINVAL); |
183 |
if ((ls == NULL) | (scan == NULL) | (len < 0)) |
184 |
returnErr(TM_E_ILLEGAL); |
185 |
if (cs != TM_NOCHROM && fabs(curgam - tms->mongam) < .02) { |
186 |
curgam = tms->mongam; /* (re)build table */ |
187 |
for (i = 1024; i--; ) |
188 |
gamtab[i] = (int)(256.*pow((i+.5)/1024., 1./curgam)); |
189 |
} |
190 |
for (i = len; i--; ) { |
191 |
if (tmNeedMatrix(tms)) { /* get monitor RGB */ |
192 |
colortrans(cmon, tms->cmat, scan[i]); |
193 |
} else { |
194 |
cmon[RED] = tms->inpsf*scan[i][RED]; |
195 |
cmon[GRN] = tms->inpsf*scan[i][GRN]; |
196 |
cmon[BLU] = tms->inpsf*scan[i][BLU]; |
197 |
} |
198 |
/* world luminance */ |
199 |
lum = tms->clf[RED]*cmon[RED] + |
200 |
tms->clf[GRN]*cmon[GRN] + |
201 |
tms->clf[BLU]*cmon[BLU] ; |
202 |
/* check range */ |
203 |
if (clipgamut(cmon, lum, CGAMUT_LOWER, csmall, cwhite)) |
204 |
lum = tms->clf[RED]*cmon[RED] + |
205 |
tms->clf[GRN]*cmon[GRN] + |
206 |
tms->clf[BLU]*cmon[BLU] ; |
207 |
if (lum < MINLUM) { |
208 |
ls[i] = MINBRT-1; /* bogus value */ |
209 |
lum = MINLUM; |
210 |
} else { |
211 |
d = TM_BRTSCALE*log(lum); /* encode it */ |
212 |
ls[i] = d>0. ? (int)(d+.5) : (int)(d-.5); |
213 |
} |
214 |
if (cs == TM_NOCHROM) /* no color? */ |
215 |
continue; |
216 |
if (tms->flags & TM_F_MESOPIC && lum < LMESUPPER) { |
217 |
slum = scotlum(cmon); /* mesopic adj. */ |
218 |
if (lum < LMESLOWER) |
219 |
cmon[RED] = cmon[GRN] = cmon[BLU] = slum; |
220 |
else { |
221 |
d = (lum - LMESLOWER)/(LMESUPPER - LMESLOWER); |
222 |
if (tms->flags & TM_F_BW) |
223 |
cmon[RED] = cmon[GRN] = |
224 |
cmon[BLU] = d*lum; |
225 |
else |
226 |
scalecolor(cmon, d); |
227 |
d = (1.-d)*slum; |
228 |
cmon[RED] += d; |
229 |
cmon[GRN] += d; |
230 |
cmon[BLU] += d; |
231 |
} |
232 |
} else if (tms->flags & TM_F_BW) { |
233 |
cmon[RED] = cmon[GRN] = cmon[BLU] = lum; |
234 |
} |
235 |
d = tms->clf[RED]*cmon[RED]/lum; |
236 |
cs[3*i ] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
237 |
d = tms->clf[GRN]*cmon[GRN]/lum; |
238 |
cs[3*i+1] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
239 |
d = tms->clf[BLU]*cmon[BLU]/lum; |
240 |
cs[3*i+2] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
241 |
} |
242 |
returnOK; |
243 |
} |
244 |
|
245 |
|
246 |
TMbright |
247 |
tmCvLuminance( /* convert a single luminance */ |
248 |
double lum |
249 |
) |
250 |
{ |
251 |
double d; |
252 |
|
253 |
if (lum <= TM_NOLUM) |
254 |
return(TM_NOBRT); |
255 |
d = TM_BRTSCALE*log(lum); |
256 |
if (d > 0.) |
257 |
return((TMbright)(d+.5)); |
258 |
return((TMbright)(d-.5)); |
259 |
} |
260 |
|
261 |
|
262 |
int |
263 |
tmCvGrays( /* convert float gray values */ |
264 |
TMstruct *tms, |
265 |
TMbright *ls, |
266 |
float *scan, |
267 |
int len |
268 |
) |
269 |
{ |
270 |
static const char funcName[] = "tmCvGrays"; |
271 |
double d; |
272 |
int i; |
273 |
|
274 |
if (tms == NULL) |
275 |
returnErr(TM_E_TMINVAL); |
276 |
if ((ls == NULL) | (scan == NULL) | (len < 0)) |
277 |
returnErr(TM_E_ILLEGAL); |
278 |
for (i = len; i--; ) |
279 |
if (scan[i] <= TM_NOLUM) { |
280 |
ls[i] = TM_NOBRT; /* bogus value */ |
281 |
} else { |
282 |
d = TM_BRTSCALE*log(scan[i]); /* encode it */ |
283 |
ls[i] = d>0. ? (int)(d+.5) : (int)(d-.5); |
284 |
} |
285 |
returnOK; |
286 |
} |
287 |
|
288 |
|
289 |
int |
290 |
tmAddHisto( /* add values to histogram */ |
291 |
TMstruct *tms, |
292 |
TMbright *ls, |
293 |
int len, |
294 |
int wt |
295 |
) |
296 |
{ |
297 |
static const char funcName[] = "tmAddHisto"; |
298 |
int oldorig=0, oldlen, horig, hlen; |
299 |
int i, j; |
300 |
|
301 |
if (tms == NULL) |
302 |
returnErr(TM_E_TMINVAL); |
303 |
if (len < 0) |
304 |
returnErr(TM_E_ILLEGAL); |
305 |
if (len == 0) |
306 |
returnOK; |
307 |
/* first, grow limits */ |
308 |
if (tms->histo == NULL) { |
309 |
for (i = len; i-- && ls[i] < MINBRT; ) |
310 |
; |
311 |
if (i < 0) |
312 |
returnOK; |
313 |
tms->hbrmin = tms->hbrmax = ls[i]; |
314 |
oldlen = 0; |
315 |
} else { |
316 |
oldorig = (tms->hbrmin-MINBRT)/HISTEP; |
317 |
oldlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - oldorig; |
318 |
} |
319 |
for (i = len; i--; ) { |
320 |
if ((j = ls[i]) < MINBRT) |
321 |
continue; |
322 |
if (j < tms->hbrmin) |
323 |
tms->hbrmin = j; |
324 |
else if (j > tms->hbrmax) |
325 |
tms->hbrmax = j; |
326 |
} |
327 |
horig = (tms->hbrmin-MINBRT)/HISTEP; |
328 |
hlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - horig; |
329 |
if (hlen > oldlen) { /* (re)allocate histogram */ |
330 |
int *newhist = (int *)calloc(hlen, sizeof(int)); |
331 |
if (newhist == NULL) |
332 |
returnErr(TM_E_NOMEM); |
333 |
if (oldlen) { /* copy and free old */ |
334 |
for (i = oldlen, j = i+oldorig-horig; i; ) |
335 |
newhist[--j] = tms->histo[--i]; |
336 |
free((MEM_PTR)tms->histo); |
337 |
} |
338 |
tms->histo = newhist; |
339 |
} |
340 |
if (wt == 0) |
341 |
returnOK; |
342 |
for (i = len; i--; ) /* add in new counts */ |
343 |
if (ls[i] >= MINBRT) |
344 |
tms->histo[ (ls[i]-MINBRT)/HISTEP - horig ] += wt; |
345 |
returnOK; |
346 |
} |
347 |
|
348 |
|
349 |
static double |
350 |
htcontrs( /* human threshold contrast sensitivity, dL(La) */ |
351 |
double La |
352 |
) |
353 |
{ |
354 |
double l10La, l10dL; |
355 |
/* formula taken from Ferwerda et al. [SG96] */ |
356 |
if (La < 1.148e-4) |
357 |
return(1.38e-3); |
358 |
l10La = log10(La); |
359 |
if (l10La < -1.44) /* rod response regime */ |
360 |
l10dL = pow(.405*l10La + 1.6, 2.18) - 2.86; |
361 |
else if (l10La < -.0184) |
362 |
l10dL = l10La - .395; |
363 |
else if (l10La < 1.9) /* cone response regime */ |
364 |
l10dL = pow(.249*l10La + .65, 2.7) - .72; |
365 |
else |
366 |
l10dL = l10La - 1.255; |
367 |
|
368 |
return(exp10(l10dL)); |
369 |
} |
370 |
|
371 |
|
372 |
static int |
373 |
tmNewMap( /* allocate new tone-mapping array */ |
374 |
TMstruct *tms |
375 |
) |
376 |
{ |
377 |
if (tms->lumap != NULL && (tms->mbrmax - tms->mbrmin) != |
378 |
(tms->hbrmax - tms->hbrmin)) { |
379 |
free((MEM_PTR)tms->lumap); |
380 |
tms->lumap = NULL; |
381 |
} |
382 |
tms->mbrmin = tms->hbrmin; |
383 |
tms->mbrmax = tms->hbrmax; |
384 |
if (tms->mbrmin > tms->mbrmax) |
385 |
return 0; |
386 |
if (tms->lumap == NULL) |
387 |
tms->lumap = (unsigned short *)malloc(sizeof(unsigned short)* |
388 |
(tms->mbrmax-tms->mbrmin+1)); |
389 |
return(tms->lumap != NULL); |
390 |
} |
391 |
|
392 |
|
393 |
int |
394 |
tmFixedMapping( /* compute fixed, linear tone-mapping */ |
395 |
TMstruct *tms, |
396 |
double expmult, |
397 |
double gamval |
398 |
) |
399 |
{ |
400 |
static const char funcName[] = "tmFixedMapping"; |
401 |
double d; |
402 |
int i; |
403 |
|
404 |
if (!tmNewMap(tms)) |
405 |
returnErr(TM_E_NOMEM); |
406 |
if (expmult <= .0) |
407 |
expmult = 1.; |
408 |
if (gamval < MINGAM) |
409 |
gamval = tms->mongam; |
410 |
d = log(expmult/tms->inpsf); |
411 |
for (i = tms->mbrmax-tms->mbrmin+1; i--; ) |
412 |
tms->lumap[i] = 256. * exp( |
413 |
( d + (tms->mbrmin+i)*(1./TM_BRTSCALE) ) |
414 |
/ gamval ); |
415 |
returnOK; |
416 |
} |
417 |
|
418 |
|
419 |
int |
420 |
tmComputeMapping( /* compute histogram tone-mapping */ |
421 |
TMstruct *tms, |
422 |
double gamval, |
423 |
double Lddyn, |
424 |
double Ldmax |
425 |
) |
426 |
{ |
427 |
static const char funcName[] = "tmComputeMapping"; |
428 |
int *histo; |
429 |
float *cumf; |
430 |
int brt0, histlen, threshold, ceiling, trimmings; |
431 |
double logLddyn, Ldmin, Ldavg, Lwavg, Tr, Lw, Ld; |
432 |
int32 histot; |
433 |
double sum; |
434 |
double d; |
435 |
int i, j; |
436 |
|
437 |
if (tms == NULL || tms->histo == NULL) |
438 |
returnErr(TM_E_TMINVAL); |
439 |
/* check arguments */ |
440 |
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
441 |
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
442 |
if (gamval < MINGAM) gamval = tms->mongam; |
443 |
/* compute handy values */ |
444 |
Ldmin = Ldmax/Lddyn; |
445 |
logLddyn = log(Lddyn); |
446 |
Ldavg = sqrt(Ldmax*Ldmin); |
447 |
i = (tms->hbrmin-MINBRT)/HISTEP; |
448 |
brt0 = MINBRT + HISTEP/2 + i*HISTEP; |
449 |
histlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - i; |
450 |
/* histogram total and mean */ |
451 |
histot = 0; sum = 0; |
452 |
j = brt0 + histlen*HISTEP; |
453 |
for (i = histlen; i--; ) { |
454 |
histot += tms->histo[i]; |
455 |
sum += (j -= HISTEP) * tms->histo[i]; |
456 |
} |
457 |
threshold = histot*0.005 + .5; |
458 |
if (threshold < 4) |
459 |
returnErr(TM_E_TMFAIL); |
460 |
Lwavg = tmLuminance( (double)sum / histot ); |
461 |
/* allocate space for mapping */ |
462 |
if (!tmNewMap(tms)) |
463 |
returnErr(TM_E_NOMEM); |
464 |
/* use linear tone mapping? */ |
465 |
if (tms->flags & TM_F_LINEAR) |
466 |
goto linearmap; |
467 |
/* clamp histogram */ |
468 |
histo = (int *)malloc(histlen*sizeof(int)); |
469 |
cumf = (float *)malloc((histlen+2)*sizeof(float)); |
470 |
if ((histo == NULL) | (cumf == NULL)) |
471 |
returnErr(TM_E_NOMEM); |
472 |
cumf[histlen+1] = 1.; /* guard for assignment code */ |
473 |
for (i = histlen; i--; ) /* make malleable copy */ |
474 |
histo[i] = tms->histo[i]; |
475 |
do { /* iterate to solution */ |
476 |
sum = 0; /* cumulative probability */ |
477 |
for (i = 0; i < histlen; i++) { |
478 |
cumf[i] = (double)sum/histot; |
479 |
sum += histo[i]; |
480 |
} |
481 |
cumf[histlen] = 1.; |
482 |
Tr = histot * (double)(tms->hbrmax - tms->hbrmin) / |
483 |
((double)histlen*TM_BRTSCALE) / logLddyn; |
484 |
ceiling = Tr + 1.; |
485 |
trimmings = 0; /* clip to envelope */ |
486 |
for (i = histlen; i--; ) { |
487 |
if (tms->flags & TM_F_HCONTR) { |
488 |
Lw = tmLuminance(brt0 + i*HISTEP); |
489 |
Ld = Ldmin * exp( logLddyn * |
490 |
.5*(cumf[i]+cumf[i+1]) ); |
491 |
ceiling = Tr * (htcontrs(Ld) * Lw) / |
492 |
(htcontrs(Lw) * Ld) + 1.; |
493 |
} |
494 |
if (histo[i] > ceiling) { |
495 |
trimmings += histo[i] - ceiling; |
496 |
histo[i] = ceiling; |
497 |
} |
498 |
} |
499 |
/* check if we're out of data */ |
500 |
if ((histot -= trimmings) <= threshold) { |
501 |
free((MEM_PTR)histo); |
502 |
free((MEM_PTR)cumf); |
503 |
goto linearmap; |
504 |
} |
505 |
} while (trimmings > threshold); |
506 |
/* assign tone-mapping */ |
507 |
for (i = tms->mbrmax-tms->mbrmin+1; i--; ) { |
508 |
j = d = (double)i/(tms->mbrmax-tms->mbrmin)*histlen; |
509 |
d -= (double)j; |
510 |
Ld = Ldmin*exp(logLddyn*((1.-d)*cumf[j]+d*cumf[j+1])); |
511 |
d = (Ld - Ldmin)/(Ldmax - Ldmin); |
512 |
tms->lumap[i] = 256.*pow(d, 1./gamval); |
513 |
} |
514 |
free((MEM_PTR)histo); /* clean up and return */ |
515 |
free((MEM_PTR)cumf); |
516 |
returnOK; |
517 |
linearmap: /* linear tone-mapping */ |
518 |
if (tms->flags & TM_F_HCONTR) |
519 |
d = htcontrs(Ldavg) / htcontrs(Lwavg); |
520 |
else |
521 |
d = Ldavg / Lwavg; |
522 |
return(tmFixedMapping(tms, tms->inpsf*d/Ldmax, gamval)); |
523 |
} |
524 |
|
525 |
|
526 |
int |
527 |
tmMapPixels( /* apply tone-mapping to pixel(s) */ |
528 |
TMstruct *tms, |
529 |
BYTE *ps, |
530 |
TMbright *ls, |
531 |
BYTE *cs, |
532 |
int len |
533 |
) |
534 |
{ |
535 |
static const char funcName[] = "tmMapPixels"; |
536 |
int32 li, pv; |
537 |
|
538 |
if (tms == NULL || tms->lumap == NULL) |
539 |
returnErr(TM_E_TMINVAL); |
540 |
if ((ps == NULL) | (ls == NULL) | (len < 0)) |
541 |
returnErr(TM_E_ILLEGAL); |
542 |
while (len--) { |
543 |
if ((li = *ls++) < tms->mbrmin) { |
544 |
li = 0; |
545 |
} else { |
546 |
if (li > tms->mbrmax) |
547 |
li = tms->mbrmax; |
548 |
li = tms->lumap[li - tms->mbrmin]; |
549 |
} |
550 |
if (cs == TM_NOCHROM) |
551 |
*ps++ = li>255 ? 255 : li; |
552 |
else { |
553 |
pv = *cs++ * li / tms->cdiv[RED]; |
554 |
*ps++ = pv>255 ? 255 : pv; |
555 |
pv = *cs++ * li / tms->cdiv[GRN]; |
556 |
*ps++ = pv>255 ? 255 : pv; |
557 |
pv = *cs++ * li / tms->cdiv[BLU]; |
558 |
*ps++ = pv>255 ? 255 : pv; |
559 |
} |
560 |
} |
561 |
returnOK; |
562 |
} |
563 |
|
564 |
|
565 |
|
566 |
|
567 |
TMstruct * |
568 |
tmDup( /* duplicate top tone mapping */ |
569 |
TMstruct *tms |
570 |
) |
571 |
{ |
572 |
int len; |
573 |
int i; |
574 |
TMstruct *tmnew; |
575 |
|
576 |
if (tms == NULL) /* anything to duplicate? */ |
577 |
return(NULL); |
578 |
tmnew = (TMstruct *)malloc(sizeof(TMstruct)); |
579 |
if (tmnew == NULL) |
580 |
return(NULL); |
581 |
*tmnew = *tms; /* copy everything */ |
582 |
if (tmnew->histo != NULL) { /* duplicate histogram */ |
583 |
len = (tmnew->hbrmax-MINBRT)/HISTEP + 1 - |
584 |
(tmnew->hbrmin-MINBRT)/HISTEP; |
585 |
tmnew->histo = (int *)malloc(len*sizeof(int)); |
586 |
if (tmnew->histo != NULL) |
587 |
for (i = len; i--; ) |
588 |
tmnew->histo[i] = tms->histo[i]; |
589 |
} |
590 |
if (tmnew->lumap != NULL) { /* duplicate luminance mapping */ |
591 |
len = tmnew->mbrmax-tmnew->mbrmin+1; |
592 |
tmnew->lumap = (unsigned short *)malloc( |
593 |
len*sizeof(unsigned short) ); |
594 |
if (tmnew->lumap != NULL) |
595 |
for (i = len; i--; ) |
596 |
tmnew->lumap[i] = tms->lumap[i]; |
597 |
} |
598 |
/* clear package data */ |
599 |
for (i = tmNumPkgs; i--; ) |
600 |
tmnew->pd[i] = NULL; |
601 |
/* return copy */ |
602 |
return(tmnew); |
603 |
} |
604 |
|
605 |
|
606 |
void |
607 |
tmDone(tms) /* done with tone mapping -- destroy it */ |
608 |
TMstruct *tms; |
609 |
{ |
610 |
int i; |
611 |
/* NULL arg. is equiv. to tms */ |
612 |
if (tms == NULL) |
613 |
return; |
614 |
/* free tables */ |
615 |
if (tms->histo != NULL) |
616 |
free((MEM_PTR)tms->histo); |
617 |
if (tms->lumap != NULL) |
618 |
free((MEM_PTR)tms->lumap); |
619 |
/* free private data */ |
620 |
for (i = tmNumPkgs; i--; ) |
621 |
if (tms->pd[i] != NULL) |
622 |
(*tmPkg[i]->Free)(tms->pd[i]); |
623 |
free((MEM_PTR)tms); /* free basic structure */ |
624 |
} |
625 |
|
626 |
/******************** Shared but Private library routines *********************/ |
627 |
|
628 |
BYTE tmMesofact[BMESUPPER-BMESLOWER]; |
629 |
|
630 |
void |
631 |
tmMkMesofact() /* build mesopic lookup factor table */ |
632 |
{ |
633 |
int i; |
634 |
|
635 |
if (tmMesofact[BMESUPPER-BMESLOWER-1]) |
636 |
return; |
637 |
|
638 |
for (i = BMESLOWER; i < BMESUPPER; i++) |
639 |
tmMesofact[i-BMESLOWER] = 256. * |
640 |
(tmLuminance(i) - LMESLOWER) / |
641 |
(LMESUPPER - LMESLOWER); |
642 |
} |
643 |
|
644 |
|
645 |
int |
646 |
tmErrorReturn( /* error return (with message) */ |
647 |
const char *func, |
648 |
TMstruct *tms, |
649 |
int err |
650 |
) |
651 |
{ |
652 |
if (tms != NULL) { |
653 |
tms->lastFunc = func; |
654 |
tms->lastError = err; |
655 |
if (tms->flags & TM_F_NOSTDERR) |
656 |
return(err); |
657 |
} |
658 |
fputs(func, stderr); |
659 |
fputs(": ", stderr); |
660 |
fputs(tmErrorMessage[err], stderr); |
661 |
fputs("!\n", stderr); |
662 |
return(err); |
663 |
} |