1 |
greg |
3.1 |
#ifndef lint |
2 |
greg |
3.20 |
static const char RCSid[] = "$Id: tonemap.c,v 3.19 2005/11/15 06:53:00 greg Exp $"; |
3 |
greg |
3.1 |
#endif |
4 |
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/* |
5 |
|
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* Tone mapping functions. |
6 |
|
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* See tonemap.h for detailed function descriptions. |
7 |
greg |
3.9 |
* Added von Kries white-balance calculations 10/01 (GW). |
8 |
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* |
9 |
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* Externals declared in tonemap.h |
10 |
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*/ |
11 |
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12 |
greg |
3.10 |
#include "copyright.h" |
13 |
greg |
3.1 |
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14 |
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#include <stdio.h> |
15 |
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#include <math.h> |
16 |
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#include "tmprivat.h" |
17 |
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#include "tmerrmsg.h" |
18 |
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19 |
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#define exp10(x) exp(M_LN10*(x)) |
20 |
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21 |
greg |
3.4 |
/* our list of conversion packages */ |
22 |
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struct tmPackage *tmPkg[TM_MAXPKG]; |
23 |
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int tmNumPkgs = 0; /* number of registered packages */ |
24 |
greg |
3.1 |
|
25 |
gregl |
3.5 |
|
26 |
greg |
3.16 |
TMstruct * |
27 |
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tmInit( /* initialize new tone mapping */ |
28 |
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int flags, |
29 |
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RGBPRIMP monpri, |
30 |
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double gamval |
31 |
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) |
32 |
greg |
3.1 |
{ |
33 |
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COLORMAT cmat; |
34 |
greg |
3.16 |
TMstruct *tmnew; |
35 |
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int i; |
36 |
greg |
3.1 |
/* allocate structure */ |
37 |
greg |
3.16 |
tmnew = (TMstruct *)malloc(sizeof(TMstruct)); |
38 |
greg |
3.1 |
if (tmnew == NULL) |
39 |
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return(NULL); |
40 |
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41 |
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tmnew->flags = flags & ~TM_F_UNIMPL; |
42 |
greg |
3.15 |
if (tmnew->flags & TM_F_BW) |
43 |
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tmnew->flags &= ~TM_F_MESOPIC; |
44 |
greg |
3.1 |
/* set monitor transform */ |
45 |
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if (monpri == NULL || monpri == stdprims || tmnew->flags & TM_F_BW) { |
46 |
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tmnew->monpri = stdprims; |
47 |
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tmnew->clf[RED] = rgb2xyzmat[1][0]; |
48 |
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tmnew->clf[GRN] = rgb2xyzmat[1][1]; |
49 |
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tmnew->clf[BLU] = rgb2xyzmat[1][2]; |
50 |
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} else { |
51 |
greg |
3.9 |
comprgb2xyzWBmat(cmat, tmnew->monpri=monpri); |
52 |
greg |
3.1 |
tmnew->clf[RED] = cmat[1][0]; |
53 |
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tmnew->clf[GRN] = cmat[1][1]; |
54 |
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tmnew->clf[BLU] = cmat[1][2]; |
55 |
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} |
56 |
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/* set gamma value */ |
57 |
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if (gamval < MINGAM) |
58 |
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tmnew->mongam = DEFGAM; |
59 |
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else |
60 |
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tmnew->mongam = gamval; |
61 |
greg |
3.4 |
/* set color divisors */ |
62 |
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for (i = 0; i < 3; i++) |
63 |
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tmnew->cdiv[i] = 256.*pow(tmnew->clf[i], 1./tmnew->mongam); |
64 |
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65 |
greg |
3.1 |
/* set input transform */ |
66 |
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tmnew->inppri = tmnew->monpri; |
67 |
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tmnew->cmat[0][0] = tmnew->cmat[1][1] = tmnew->cmat[2][2] = |
68 |
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tmnew->inpsf = WHTEFFICACY; |
69 |
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tmnew->cmat[0][1] = tmnew->cmat[0][2] = tmnew->cmat[1][0] = |
70 |
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tmnew->cmat[1][2] = tmnew->cmat[2][0] = tmnew->cmat[2][1] = 0.; |
71 |
greg |
3.18 |
tmnew->inpdat = NULL; |
72 |
greg |
3.9 |
tmnew->hbrmin = 10; tmnew->hbrmax = -10; |
73 |
greg |
3.1 |
tmnew->histo = NULL; |
74 |
greg |
3.9 |
tmnew->mbrmin = 10; tmnew->mbrmax = -10; |
75 |
greg |
3.1 |
tmnew->lumap = NULL; |
76 |
greg |
3.4 |
/* zero private data */ |
77 |
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for (i = TM_MAXPKG; i--; ) |
78 |
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tmnew->pd[i] = NULL; |
79 |
greg |
3.17 |
tmnew->lastError = TM_E_OK; |
80 |
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tmnew->lastFunc = "NoErr"; |
81 |
greg |
3.16 |
/* return new TMstruct */ |
82 |
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return(tmnew); |
83 |
greg |
3.1 |
} |
84 |
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85 |
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|
86 |
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int |
87 |
greg |
3.16 |
tmSetSpace( /* set input color space for conversions */ |
88 |
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TMstruct *tms, |
89 |
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RGBPRIMP pri, |
90 |
greg |
3.18 |
double sf, |
91 |
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MEM_PTR dat |
92 |
greg |
3.16 |
) |
93 |
greg |
3.1 |
{ |
94 |
greg |
3.17 |
static const char funcName[] = "tmSetSpace"; |
95 |
greg |
3.16 |
int i, j; |
96 |
greg |
3.1 |
/* error check */ |
97 |
greg |
3.16 |
if (tms == NULL) |
98 |
greg |
3.1 |
returnErr(TM_E_TMINVAL); |
99 |
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if (sf <= 1e-12) |
100 |
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returnErr(TM_E_ILLEGAL); |
101 |
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/* check if no change */ |
102 |
greg |
3.18 |
if (pri == tms->inppri && FEQ(sf, tms->inpsf) && dat == tms->inpdat) |
103 |
greg |
3.1 |
returnOK; |
104 |
greg |
3.16 |
tms->inppri = pri; /* let's set it */ |
105 |
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tms->inpsf = sf; |
106 |
greg |
3.18 |
tms->inpdat = dat; |
107 |
greg |
3.1 |
|
108 |
greg |
3.16 |
if (tms->flags & TM_F_BW) { /* color doesn't matter */ |
109 |
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tms->monpri = tms->inppri; /* eliminate xform */ |
110 |
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if (tms->inppri == TM_XYZPRIM) { |
111 |
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tms->clf[CIEX] = tms->clf[CIEZ] = 0.; |
112 |
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tms->clf[CIEY] = 1.; |
113 |
greg |
3.1 |
} else { |
114 |
greg |
3.16 |
comprgb2xyzWBmat(tms->cmat, tms->monpri); |
115 |
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tms->clf[RED] = tms->cmat[1][0]; |
116 |
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tms->clf[GRN] = tms->cmat[1][1]; |
117 |
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tms->clf[BLU] = tms->cmat[1][2]; |
118 |
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} |
119 |
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tms->cmat[0][0] = tms->cmat[1][1] = tms->cmat[2][2] = |
120 |
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tms->inpsf; |
121 |
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tms->cmat[0][1] = tms->cmat[0][2] = tms->cmat[1][0] = |
122 |
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tms->cmat[1][2] = tms->cmat[2][0] = tms->cmat[2][1] = 0.; |
123 |
greg |
3.1 |
|
124 |
greg |
3.16 |
} else if (tms->inppri == TM_XYZPRIM) /* input is XYZ */ |
125 |
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compxyz2rgbWBmat(tms->cmat, tms->monpri); |
126 |
greg |
3.1 |
|
127 |
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else { /* input is RGB */ |
128 |
greg |
3.16 |
if (tms->inppri != tms->monpri && |
129 |
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PRIMEQ(tms->inppri, tms->monpri)) |
130 |
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tms->inppri = tms->monpri; /* no xform */ |
131 |
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comprgb2rgbWBmat(tms->cmat, tms->inppri, tms->monpri); |
132 |
greg |
3.1 |
} |
133 |
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for (i = 0; i < 3; i++) |
134 |
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for (j = 0; j < 3; j++) |
135 |
greg |
3.16 |
tms->cmat[i][j] *= tms->inpsf; |
136 |
greg |
3.4 |
/* set color divisors */ |
137 |
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for (i = 0; i < 3; i++) |
138 |
greg |
3.16 |
if (tms->clf[i] > .001) |
139 |
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tms->cdiv[i] = |
140 |
|
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256.*pow(tms->clf[i], 1./tms->mongam); |
141 |
greg |
3.4 |
else |
142 |
greg |
3.16 |
tms->cdiv[i] = 1; |
143 |
greg |
3.4 |
/* notify packages */ |
144 |
|
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for (i = tmNumPkgs; i--; ) |
145 |
greg |
3.16 |
if (tms->pd[i] != NULL && tmPkg[i]->NewSpace != NULL) |
146 |
|
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(*tmPkg[i]->NewSpace)(tms); |
147 |
greg |
3.1 |
returnOK; |
148 |
|
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} |
149 |
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|
150 |
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|
151 |
|
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void |
152 |
greg |
3.16 |
tmClearHisto( /* clear current histogram */ |
153 |
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TMstruct *tms |
154 |
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) |
155 |
greg |
3.1 |
{ |
156 |
greg |
3.16 |
if (tms == NULL || tms->histo == NULL) |
157 |
greg |
3.1 |
return; |
158 |
greg |
3.16 |
free((MEM_PTR)tms->histo); |
159 |
|
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tms->histo = NULL; |
160 |
greg |
3.1 |
} |
161 |
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|
162 |
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|
163 |
|
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int |
164 |
greg |
3.16 |
tmCvColors( /* convert float colors */ |
165 |
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TMstruct *tms, |
166 |
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TMbright *ls, |
167 |
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BYTE *cs, |
168 |
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COLOR *scan, |
169 |
|
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int len |
170 |
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) |
171 |
greg |
3.1 |
{ |
172 |
greg |
3.17 |
static const char funcName[] = "tmCvColors"; |
173 |
greg |
3.12 |
static COLOR csmall = {.5*MINLUM, .5*MINLUM, .5*MINLUM}; |
174 |
greg |
3.20 |
static BYTE gamtab[1024]; |
175 |
|
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static double curgam = .0; |
176 |
greg |
3.1 |
COLOR cmon; |
177 |
|
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double lum, slum; |
178 |
greg |
3.16 |
double d; |
179 |
|
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int i; |
180 |
greg |
3.1 |
|
181 |
greg |
3.16 |
if (tms == NULL) |
182 |
greg |
3.1 |
returnErr(TM_E_TMINVAL); |
183 |
schorsch |
3.13 |
if ((ls == NULL) | (scan == NULL) | (len < 0)) |
184 |
greg |
3.1 |
returnErr(TM_E_ILLEGAL); |
185 |
greg |
3.20 |
if (cs != TM_NOCHROM && fabs(curgam - tms->mongam) < .02) { |
186 |
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curgam = tms->mongam; /* (re)build table */ |
187 |
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for (i = 1024; i--; ) |
188 |
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gamtab[i] = (int)(256.*pow((i+.5)/1024., 1./curgam)); |
189 |
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} |
190 |
greg |
3.1 |
for (i = len; i--; ) { |
191 |
greg |
3.16 |
if (tmNeedMatrix(tms)) { /* get monitor RGB */ |
192 |
|
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colortrans(cmon, tms->cmat, scan[i]); |
193 |
greg |
3.15 |
} else { |
194 |
greg |
3.16 |
cmon[RED] = tms->inpsf*scan[i][RED]; |
195 |
|
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cmon[GRN] = tms->inpsf*scan[i][GRN]; |
196 |
|
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cmon[BLU] = tms->inpsf*scan[i][BLU]; |
197 |
greg |
3.1 |
} |
198 |
|
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/* world luminance */ |
199 |
greg |
3.16 |
lum = tms->clf[RED]*cmon[RED] + |
200 |
|
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tms->clf[GRN]*cmon[GRN] + |
201 |
|
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tms->clf[BLU]*cmon[BLU] ; |
202 |
greg |
3.1 |
/* check range */ |
203 |
greg |
3.4 |
if (clipgamut(cmon, lum, CGAMUT_LOWER, csmall, cwhite)) |
204 |
greg |
3.16 |
lum = tms->clf[RED]*cmon[RED] + |
205 |
|
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tms->clf[GRN]*cmon[GRN] + |
206 |
|
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tms->clf[BLU]*cmon[BLU] ; |
207 |
greg |
3.1 |
if (lum < MINLUM) { |
208 |
|
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ls[i] = MINBRT-1; /* bogus value */ |
209 |
|
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lum = MINLUM; |
210 |
|
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} else { |
211 |
|
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d = TM_BRTSCALE*log(lum); /* encode it */ |
212 |
|
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ls[i] = d>0. ? (int)(d+.5) : (int)(d-.5); |
213 |
|
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} |
214 |
|
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if (cs == TM_NOCHROM) /* no color? */ |
215 |
|
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continue; |
216 |
greg |
3.16 |
if (tms->flags & TM_F_MESOPIC && lum < LMESUPPER) { |
217 |
greg |
3.1 |
slum = scotlum(cmon); /* mesopic adj. */ |
218 |
|
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if (lum < LMESLOWER) |
219 |
|
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cmon[RED] = cmon[GRN] = cmon[BLU] = slum; |
220 |
|
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else { |
221 |
|
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d = (lum - LMESLOWER)/(LMESUPPER - LMESLOWER); |
222 |
greg |
3.16 |
if (tms->flags & TM_F_BW) |
223 |
greg |
3.1 |
cmon[RED] = cmon[GRN] = |
224 |
|
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cmon[BLU] = d*lum; |
225 |
|
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else |
226 |
|
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scalecolor(cmon, d); |
227 |
|
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d = (1.-d)*slum; |
228 |
|
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cmon[RED] += d; |
229 |
|
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cmon[GRN] += d; |
230 |
|
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cmon[BLU] += d; |
231 |
|
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} |
232 |
greg |
3.16 |
} else if (tms->flags & TM_F_BW) { |
233 |
greg |
3.1 |
cmon[RED] = cmon[GRN] = cmon[BLU] = lum; |
234 |
|
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} |
235 |
greg |
3.16 |
d = tms->clf[RED]*cmon[RED]/lum; |
236 |
greg |
3.20 |
cs[3*i ] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
237 |
greg |
3.16 |
d = tms->clf[GRN]*cmon[GRN]/lum; |
238 |
greg |
3.20 |
cs[3*i+1] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
239 |
greg |
3.16 |
d = tms->clf[BLU]*cmon[BLU]/lum; |
240 |
greg |
3.20 |
cs[3*i+2] = d>=.999 ? 255 : gamtab[(int)(1024.*d)]; |
241 |
greg |
3.1 |
} |
242 |
|
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returnOK; |
243 |
|
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} |
244 |
|
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|
245 |
|
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|
246 |
greg |
3.19 |
TMbright |
247 |
|
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tmCvLuminance( /* convert a single luminance */ |
248 |
|
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double lum |
249 |
|
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) |
250 |
|
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{ |
251 |
|
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double d; |
252 |
|
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|
253 |
|
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if (lum <= TM_NOLUM) |
254 |
|
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return(TM_NOBRT); |
255 |
|
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d = TM_BRTSCALE*log(lum); |
256 |
|
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if (d > 0.) |
257 |
|
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return((TMbright)(d+.5)); |
258 |
|
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return((TMbright)(d-.5)); |
259 |
|
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} |
260 |
|
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|
261 |
|
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|
262 |
greg |
3.1 |
int |
263 |
greg |
3.16 |
tmCvGrays( /* convert float gray values */ |
264 |
|
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TMstruct *tms, |
265 |
|
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TMbright *ls, |
266 |
|
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float *scan, |
267 |
|
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int len |
268 |
|
|
) |
269 |
greg |
3.9 |
{ |
270 |
greg |
3.17 |
static const char funcName[] = "tmCvGrays"; |
271 |
greg |
3.16 |
double d; |
272 |
|
|
int i; |
273 |
greg |
3.9 |
|
274 |
greg |
3.16 |
if (tms == NULL) |
275 |
greg |
3.9 |
returnErr(TM_E_TMINVAL); |
276 |
schorsch |
3.13 |
if ((ls == NULL) | (scan == NULL) | (len < 0)) |
277 |
greg |
3.9 |
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 |
greg |
3.16 |
tmAddHisto( /* add values to histogram */ |
291 |
|
|
TMstruct *tms, |
292 |
|
|
TMbright *ls, |
293 |
|
|
int len, |
294 |
|
|
int wt |
295 |
|
|
) |
296 |
greg |
3.1 |
{ |
297 |
greg |
3.17 |
static const char funcName[] = "tmAddHisto"; |
298 |
greg |
3.9 |
int oldorig=0, oldlen, horig, hlen; |
299 |
greg |
3.16 |
int i, j; |
300 |
greg |
3.1 |
|
301 |
greg |
3.16 |
if (tms == NULL) |
302 |
greg |
3.1 |
returnErr(TM_E_TMINVAL); |
303 |
gwlarson |
3.8 |
if (len < 0) |
304 |
|
|
returnErr(TM_E_ILLEGAL); |
305 |
|
|
if (len == 0) |
306 |
|
|
returnOK; |
307 |
greg |
3.1 |
/* first, grow limits */ |
308 |
greg |
3.16 |
if (tms->histo == NULL) { |
309 |
greg |
3.1 |
for (i = len; i-- && ls[i] < MINBRT; ) |
310 |
|
|
; |
311 |
|
|
if (i < 0) |
312 |
|
|
returnOK; |
313 |
greg |
3.16 |
tms->hbrmin = tms->hbrmax = ls[i]; |
314 |
greg |
3.1 |
oldlen = 0; |
315 |
|
|
} else { |
316 |
greg |
3.16 |
oldorig = (tms->hbrmin-MINBRT)/HISTEP; |
317 |
|
|
oldlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - oldorig; |
318 |
greg |
3.1 |
} |
319 |
|
|
for (i = len; i--; ) { |
320 |
|
|
if ((j = ls[i]) < MINBRT) |
321 |
|
|
continue; |
322 |
greg |
3.16 |
if (j < tms->hbrmin) |
323 |
|
|
tms->hbrmin = j; |
324 |
|
|
else if (j > tms->hbrmax) |
325 |
|
|
tms->hbrmax = j; |
326 |
greg |
3.1 |
} |
327 |
greg |
3.16 |
horig = (tms->hbrmin-MINBRT)/HISTEP; |
328 |
|
|
hlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - horig; |
329 |
greg |
3.1 |
if (hlen > oldlen) { /* (re)allocate histogram */ |
330 |
greg |
3.16 |
int *newhist = (int *)calloc(hlen, sizeof(int)); |
331 |
greg |
3.1 |
if (newhist == NULL) |
332 |
|
|
returnErr(TM_E_NOMEM); |
333 |
|
|
if (oldlen) { /* copy and free old */ |
334 |
greg |
3.2 |
for (i = oldlen, j = i+oldorig-horig; i; ) |
335 |
greg |
3.16 |
newhist[--j] = tms->histo[--i]; |
336 |
|
|
free((MEM_PTR)tms->histo); |
337 |
greg |
3.1 |
} |
338 |
greg |
3.16 |
tms->histo = newhist; |
339 |
greg |
3.1 |
} |
340 |
|
|
if (wt == 0) |
341 |
|
|
returnOK; |
342 |
|
|
for (i = len; i--; ) /* add in new counts */ |
343 |
|
|
if (ls[i] >= MINBRT) |
344 |
greg |
3.16 |
tms->histo[ (ls[i]-MINBRT)/HISTEP - horig ] += wt; |
345 |
greg |
3.1 |
returnOK; |
346 |
|
|
} |
347 |
|
|
|
348 |
|
|
|
349 |
|
|
static double |
350 |
greg |
3.16 |
htcontrs( /* human threshold contrast sensitivity, dL(La) */ |
351 |
|
|
double La |
352 |
|
|
) |
353 |
greg |
3.1 |
{ |
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 |
greg |
3.9 |
static int |
373 |
greg |
3.16 |
tmNewMap( /* allocate new tone-mapping array */ |
374 |
|
|
TMstruct *tms |
375 |
|
|
) |
376 |
greg |
3.9 |
{ |
377 |
greg |
3.16 |
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 |
greg |
3.9 |
return 0; |
386 |
greg |
3.16 |
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 |
greg |
3.9 |
} |
391 |
|
|
|
392 |
|
|
|
393 |
|
|
int |
394 |
greg |
3.16 |
tmFixedMapping( /* compute fixed, linear tone-mapping */ |
395 |
|
|
TMstruct *tms, |
396 |
|
|
double expmult, |
397 |
|
|
double gamval |
398 |
|
|
) |
399 |
greg |
3.9 |
{ |
400 |
greg |
3.17 |
static const char funcName[] = "tmFixedMapping"; |
401 |
greg |
3.9 |
double d; |
402 |
greg |
3.16 |
int i; |
403 |
greg |
3.9 |
|
404 |
greg |
3.16 |
if (!tmNewMap(tms)) |
405 |
greg |
3.9 |
returnErr(TM_E_NOMEM); |
406 |
|
|
if (expmult <= .0) |
407 |
|
|
expmult = 1.; |
408 |
|
|
if (gamval < MINGAM) |
409 |
greg |
3.16 |
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 |
greg |
3.9 |
/ gamval ); |
415 |
|
|
returnOK; |
416 |
|
|
} |
417 |
|
|
|
418 |
|
|
|
419 |
greg |
3.1 |
int |
420 |
greg |
3.16 |
tmComputeMapping( /* compute histogram tone-mapping */ |
421 |
|
|
TMstruct *tms, |
422 |
|
|
double gamval, |
423 |
|
|
double Lddyn, |
424 |
|
|
double Ldmax |
425 |
|
|
) |
426 |
greg |
3.1 |
{ |
427 |
greg |
3.17 |
static const char funcName[] = "tmComputeMapping"; |
428 |
greg |
3.1 |
int *histo; |
429 |
|
|
float *cumf; |
430 |
greg |
3.9 |
int brt0, histlen, threshold, ceiling, trimmings; |
431 |
greg |
3.1 |
double logLddyn, Ldmin, Ldavg, Lwavg, Tr, Lw, Ld; |
432 |
greg |
3.11 |
int32 histot; |
433 |
greg |
3.9 |
double sum; |
434 |
greg |
3.16 |
double d; |
435 |
|
|
int i, j; |
436 |
greg |
3.1 |
|
437 |
greg |
3.16 |
if (tms == NULL || tms->histo == NULL) |
438 |
greg |
3.1 |
returnErr(TM_E_TMINVAL); |
439 |
|
|
/* check arguments */ |
440 |
|
|
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
441 |
|
|
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
442 |
greg |
3.16 |
if (gamval < MINGAM) gamval = tms->mongam; |
443 |
greg |
3.1 |
/* compute handy values */ |
444 |
|
|
Ldmin = Ldmax/Lddyn; |
445 |
|
|
logLddyn = log(Lddyn); |
446 |
|
|
Ldavg = sqrt(Ldmax*Ldmin); |
447 |
greg |
3.16 |
i = (tms->hbrmin-MINBRT)/HISTEP; |
448 |
greg |
3.1 |
brt0 = MINBRT + HISTEP/2 + i*HISTEP; |
449 |
greg |
3.16 |
histlen = (tms->hbrmax-MINBRT)/HISTEP + 1 - i; |
450 |
greg |
3.1 |
/* histogram total and mean */ |
451 |
|
|
histot = 0; sum = 0; |
452 |
|
|
j = brt0 + histlen*HISTEP; |
453 |
|
|
for (i = histlen; i--; ) { |
454 |
greg |
3.16 |
histot += tms->histo[i]; |
455 |
|
|
sum += (j -= HISTEP) * tms->histo[i]; |
456 |
greg |
3.1 |
} |
457 |
greg |
3.14 |
threshold = histot*0.005 + .5; |
458 |
greg |
3.1 |
if (threshold < 4) |
459 |
|
|
returnErr(TM_E_TMFAIL); |
460 |
|
|
Lwavg = tmLuminance( (double)sum / histot ); |
461 |
greg |
3.9 |
/* allocate space for mapping */ |
462 |
greg |
3.16 |
if (!tmNewMap(tms)) |
463 |
greg |
3.9 |
returnErr(TM_E_NOMEM); |
464 |
|
|
/* use linear tone mapping? */ |
465 |
greg |
3.16 |
if (tms->flags & TM_F_LINEAR) |
466 |
greg |
3.9 |
goto linearmap; |
467 |
|
|
/* clamp histogram */ |
468 |
|
|
histo = (int *)malloc(histlen*sizeof(int)); |
469 |
|
|
cumf = (float *)malloc((histlen+2)*sizeof(float)); |
470 |
schorsch |
3.13 |
if ((histo == NULL) | (cumf == NULL)) |
471 |
greg |
3.9 |
returnErr(TM_E_NOMEM); |
472 |
|
|
cumf[histlen+1] = 1.; /* guard for assignment code */ |
473 |
|
|
for (i = histlen; i--; ) /* make malleable copy */ |
474 |
greg |
3.16 |
histo[i] = tms->histo[i]; |
475 |
greg |
3.9 |
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 |
greg |
3.16 |
Tr = histot * (double)(tms->hbrmax - tms->hbrmin) / |
483 |
greg |
3.9 |
((double)histlen*TM_BRTSCALE) / logLddyn; |
484 |
|
|
ceiling = Tr + 1.; |
485 |
|
|
trimmings = 0; /* clip to envelope */ |
486 |
|
|
for (i = histlen; i--; ) { |
487 |
greg |
3.16 |
if (tms->flags & TM_F_HCONTR) { |
488 |
greg |
3.9 |
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 |
greg |
3.2 |
} |
494 |
greg |
3.9 |
if (histo[i] > ceiling) { |
495 |
|
|
trimmings += histo[i] - ceiling; |
496 |
|
|
histo[i] = ceiling; |
497 |
greg |
3.1 |
} |
498 |
|
|
} |
499 |
greg |
3.9 |
/* 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 |
greg |
3.16 |
for (i = tms->mbrmax-tms->mbrmin+1; i--; ) { |
508 |
|
|
j = d = (double)i/(tms->mbrmax-tms->mbrmin)*histlen; |
509 |
greg |
3.9 |
d -= (double)j; |
510 |
|
|
Ld = Ldmin*exp(logLddyn*((1.-d)*cumf[j]+d*cumf[j+1])); |
511 |
|
|
d = (Ld - Ldmin)/(Ldmax - Ldmin); |
512 |
greg |
3.16 |
tms->lumap[i] = 256.*pow(d, 1./gamval); |
513 |
greg |
3.1 |
} |
514 |
greg |
3.9 |
free((MEM_PTR)histo); /* clean up and return */ |
515 |
|
|
free((MEM_PTR)cumf); |
516 |
greg |
3.1 |
returnOK; |
517 |
greg |
3.9 |
linearmap: /* linear tone-mapping */ |
518 |
greg |
3.16 |
if (tms->flags & TM_F_HCONTR) |
519 |
greg |
3.9 |
d = htcontrs(Ldavg) / htcontrs(Lwavg); |
520 |
|
|
else |
521 |
|
|
d = Ldavg / Lwavg; |
522 |
greg |
3.16 |
return(tmFixedMapping(tms, tms->inpsf*d/Ldmax, gamval)); |
523 |
greg |
3.1 |
} |
524 |
|
|
|
525 |
|
|
|
526 |
|
|
int |
527 |
greg |
3.16 |
tmMapPixels( /* apply tone-mapping to pixel(s) */ |
528 |
|
|
TMstruct *tms, |
529 |
|
|
BYTE *ps, |
530 |
|
|
TMbright *ls, |
531 |
|
|
BYTE *cs, |
532 |
|
|
int len |
533 |
|
|
) |
534 |
greg |
3.1 |
{ |
535 |
greg |
3.17 |
static const char funcName[] = "tmMapPixels"; |
536 |
greg |
3.16 |
int32 li, pv; |
537 |
greg |
3.1 |
|
538 |
greg |
3.16 |
if (tms == NULL || tms->lumap == NULL) |
539 |
greg |
3.1 |
returnErr(TM_E_TMINVAL); |
540 |
schorsch |
3.13 |
if ((ps == NULL) | (ls == NULL) | (len < 0)) |
541 |
greg |
3.1 |
returnErr(TM_E_ILLEGAL); |
542 |
|
|
while (len--) { |
543 |
greg |
3.16 |
if ((li = *ls++) < tms->mbrmin) { |
544 |
greg |
3.9 |
li = 0; |
545 |
|
|
} else { |
546 |
greg |
3.16 |
if (li > tms->mbrmax) |
547 |
|
|
li = tms->mbrmax; |
548 |
|
|
li = tms->lumap[li - tms->mbrmin]; |
549 |
greg |
3.9 |
} |
550 |
greg |
3.1 |
if (cs == TM_NOCHROM) |
551 |
|
|
*ps++ = li>255 ? 255 : li; |
552 |
|
|
else { |
553 |
greg |
3.16 |
pv = *cs++ * li / tms->cdiv[RED]; |
554 |
greg |
3.1 |
*ps++ = pv>255 ? 255 : pv; |
555 |
greg |
3.16 |
pv = *cs++ * li / tms->cdiv[GRN]; |
556 |
greg |
3.1 |
*ps++ = pv>255 ? 255 : pv; |
557 |
greg |
3.16 |
pv = *cs++ * li / tms->cdiv[BLU]; |
558 |
greg |
3.1 |
*ps++ = pv>255 ? 255 : pv; |
559 |
|
|
} |
560 |
|
|
} |
561 |
|
|
returnOK; |
562 |
|
|
} |
563 |
|
|
|
564 |
|
|
|
565 |
|
|
|
566 |
|
|
|
567 |
greg |
3.16 |
TMstruct * |
568 |
|
|
tmDup( /* duplicate top tone mapping */ |
569 |
|
|
TMstruct *tms |
570 |
|
|
) |
571 |
greg |
3.3 |
{ |
572 |
|
|
int len; |
573 |
greg |
3.16 |
int i; |
574 |
|
|
TMstruct *tmnew; |
575 |
greg |
3.3 |
|
576 |
greg |
3.16 |
if (tms == NULL) /* anything to duplicate? */ |
577 |
greg |
3.3 |
return(NULL); |
578 |
greg |
3.16 |
tmnew = (TMstruct *)malloc(sizeof(TMstruct)); |
579 |
greg |
3.3 |
if (tmnew == NULL) |
580 |
|
|
return(NULL); |
581 |
greg |
3.16 |
*tmnew = *tms; /* copy everything */ |
582 |
greg |
3.3 |
if (tmnew->histo != NULL) { /* duplicate histogram */ |
583 |
gregl |
3.6 |
len = (tmnew->hbrmax-MINBRT)/HISTEP + 1 - |
584 |
|
|
(tmnew->hbrmin-MINBRT)/HISTEP; |
585 |
greg |
3.3 |
tmnew->histo = (int *)malloc(len*sizeof(int)); |
586 |
|
|
if (tmnew->histo != NULL) |
587 |
|
|
for (i = len; i--; ) |
588 |
greg |
3.16 |
tmnew->histo[i] = tms->histo[i]; |
589 |
greg |
3.3 |
} |
590 |
|
|
if (tmnew->lumap != NULL) { /* duplicate luminance mapping */ |
591 |
gregl |
3.6 |
len = tmnew->mbrmax-tmnew->mbrmin+1; |
592 |
greg |
3.3 |
tmnew->lumap = (unsigned short *)malloc( |
593 |
|
|
len*sizeof(unsigned short) ); |
594 |
|
|
if (tmnew->lumap != NULL) |
595 |
|
|
for (i = len; i--; ) |
596 |
greg |
3.16 |
tmnew->lumap[i] = tms->lumap[i]; |
597 |
greg |
3.3 |
} |
598 |
greg |
3.4 |
/* clear package data */ |
599 |
|
|
for (i = tmNumPkgs; i--; ) |
600 |
|
|
tmnew->pd[i] = NULL; |
601 |
greg |
3.16 |
/* return copy */ |
602 |
|
|
return(tmnew); |
603 |
greg |
3.1 |
} |
604 |
|
|
|
605 |
|
|
|
606 |
|
|
void |
607 |
|
|
tmDone(tms) /* done with tone mapping -- destroy it */ |
608 |
greg |
3.16 |
TMstruct *tms; |
609 |
greg |
3.1 |
{ |
610 |
greg |
3.16 |
int i; |
611 |
|
|
/* NULL arg. is equiv. to tms */ |
612 |
|
|
if (tms == NULL) |
613 |
greg |
3.1 |
return; |
614 |
|
|
/* free tables */ |
615 |
|
|
if (tms->histo != NULL) |
616 |
greg |
3.4 |
free((MEM_PTR)tms->histo); |
617 |
greg |
3.1 |
if (tms->lumap != NULL) |
618 |
greg |
3.4 |
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 |
greg |
3.9 |
} |
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 |
greg |
3.16 |
int i; |
634 |
greg |
3.9 |
|
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 |
greg |
3.16 |
tmErrorReturn( /* error return (with message) */ |
647 |
greg |
3.17 |
const char *func, |
648 |
greg |
3.16 |
TMstruct *tms, |
649 |
|
|
int err |
650 |
|
|
) |
651 |
greg |
3.9 |
{ |
652 |
greg |
3.17 |
if (tms != NULL) { |
653 |
|
|
tms->lastFunc = func; |
654 |
|
|
tms->lastError = err; |
655 |
|
|
if (tms->flags & TM_F_NOSTDERR) |
656 |
|
|
return(err); |
657 |
|
|
} |
658 |
greg |
3.9 |
fputs(func, stderr); |
659 |
|
|
fputs(": ", stderr); |
660 |
|
|
fputs(tmErrorMessage[err], stderr); |
661 |
|
|
fputs("!\n", stderr); |
662 |
|
|
return(err); |
663 |
greg |
3.1 |
} |