13 |
|
C_COLOR c_dfcolor = C_DEFCOLOR; |
14 |
|
|
15 |
|
/* CIE 1931 Standard Observer curves */ |
16 |
< |
static C_COLOR cie_xf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
16 |
> |
static const C_COLOR cie_xf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
17 |
|
{14,42,143,435,1344,2839,3483,3362,2908,1954,956, |
18 |
|
320,49,93,633,1655,2904,4334,5945,7621,9163,10263, |
19 |
|
10622,10026,8544,6424,4479,2835,1649,874,468,227, |
20 |
|
114,58,29,14,7,3,2,1,0}, 106836L, .467, .368, 362.230 |
21 |
|
}; |
22 |
< |
static C_COLOR cie_yf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
22 |
> |
static const C_COLOR cie_yf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
23 |
|
{0,1,4,12,40,116,230,380,600,910,1390,2080,3230, |
24 |
|
5030,7100,8620,9540,9950,9950,9520,8700,7570,6310, |
25 |
|
5030,3810,2650,1750,1070,610,320,170,82,41,21,10, |
26 |
|
5,2,1,1,0,0}, 106856L, .398, .542, 493.525 |
27 |
|
}; |
28 |
< |
static C_COLOR cie_zf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
28 |
> |
static const C_COLOR cie_zf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
29 |
|
{65,201,679,2074,6456,13856,17471,17721,16692, |
30 |
|
12876,8130,4652,2720,1582,782,422,203,87,39,21,17, |
31 |
|
11,8,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, |
32 |
|
106770L, .147, .077, 54.363 |
33 |
|
}; |
34 |
|
/* Derived CIE 1931 Primaries (imaginary) */ |
35 |
< |
static C_COLOR cie_xp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
35 |
> |
static const C_COLOR cie_xp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
36 |
|
{-174,-198,-195,-197,-202,-213,-235,-272,-333, |
37 |
|
-444,-688,-1232,-2393,-4497,-6876,-6758,-5256, |
38 |
|
-3100,-815,1320,3200,4782,5998,6861,7408,7754, |
40 |
|
8336,8336,8336,8336,8336,8336}, |
41 |
|
127424L, 1., .0, |
42 |
|
}; |
43 |
< |
static C_COLOR cie_yp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
43 |
> |
static const C_COLOR cie_yp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
44 |
|
{-451,-431,-431,-430,-427,-417,-399,-366,-312, |
45 |
|
-204,57,691,2142,4990,8810,9871,9122,7321,5145, |
46 |
|
3023,1123,-473,-1704,-2572,-3127,-3474,-3704, |
48 |
|
-4066,-4066,-4066,-4066,-4066,-4066}, |
49 |
|
-23035L, .0, 1., |
50 |
|
}; |
51 |
< |
static C_COLOR cie_zp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
51 |
> |
static const C_COLOR cie_zp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
52 |
|
{4051,4054,4052,4053,4054,4056,4059,4064,4071, |
53 |
|
4074,4056,3967,3677,2933,1492,313,-440,-795, |
54 |
|
-904,-918,-898,-884,-869,-863,-855,-855,-851, |
57 |
|
36057L, .0, .0, |
58 |
|
}; |
59 |
|
|
60 |
+ |
/* Sharp primary matrix */ |
61 |
+ |
static const float toSharp[3][3] = { |
62 |
+ |
{ 1.2694, -0.0988, -0.1706}, |
63 |
+ |
{-0.8364, 1.8006, 0.0357}, |
64 |
+ |
{ 0.0297, -0.0315, 1.0018} |
65 |
+ |
}; |
66 |
+ |
/* inverse Sharp primary matrix */ |
67 |
+ |
static const float fromSharp[3][3] = { |
68 |
+ |
{ 0.8156, 0.0472, 0.1372}, |
69 |
+ |
{ 0.3791, 0.5769, 0.0440}, |
70 |
+ |
{-0.0123, 0.0167, 0.9955} |
71 |
+ |
}; |
72 |
+ |
|
73 |
+ |
static void |
74 |
+ |
c_toSharpRGB(C_COLOR *cin, double cieY, float cout[3]) |
75 |
+ |
{ |
76 |
+ |
double xyz[3]; |
77 |
+ |
|
78 |
+ |
c_ccvt(cin, C_CSXY); |
79 |
+ |
|
80 |
+ |
xyz[0] = cin->cx/cin->cy * cieY; |
81 |
+ |
xyz[1] = cieY; |
82 |
+ |
xyz[2] = (1. - cin->cx - cin->cy)/cin->cy * cieY; |
83 |
+ |
|
84 |
+ |
cout[0] = toSharp[0][0]*xyz[0] + toSharp[0][1]*xyz[1] + |
85 |
+ |
toSharp[0][2]*xyz[2]; |
86 |
+ |
cout[1] = toSharp[1][0]*xyz[0] + toSharp[1][1]*xyz[1] + |
87 |
+ |
toSharp[1][2]*xyz[2]; |
88 |
+ |
cout[2] = toSharp[2][0]*xyz[0] + toSharp[2][1]*xyz[1] + |
89 |
+ |
toSharp[2][2]*xyz[2]; |
90 |
+ |
} |
91 |
+ |
|
92 |
+ |
static double |
93 |
+ |
c_fromSharpRGB(float cin[3], C_COLOR *cout) |
94 |
+ |
{ |
95 |
+ |
double xyz[3], sf; |
96 |
+ |
|
97 |
+ |
xyz[0] = fromSharp[0][0]*cin[0] + fromSharp[0][1]*cin[1] + |
98 |
+ |
fromSharp[0][2]*cin[2]; |
99 |
+ |
xyz[1] = fromSharp[1][0]*cin[0] + fromSharp[1][1]*cin[1] + |
100 |
+ |
fromSharp[1][2]*cin[2]; |
101 |
+ |
xyz[2] = fromSharp[2][0]*cin[0] + fromSharp[2][1]*cin[1] + |
102 |
+ |
fromSharp[2][2]*cin[2]; |
103 |
+ |
|
104 |
+ |
sf = 1./(xyz[0] + xyz[1] + xyz[2]); |
105 |
+ |
|
106 |
+ |
cout->cx = xyz[0] * sf; |
107 |
+ |
cout->cy = xyz[1] * sf; |
108 |
+ |
cout->flags = C_CDXY|C_CSXY; |
109 |
+ |
|
110 |
+ |
return(xyz[1]); |
111 |
+ |
} |
112 |
+ |
|
113 |
+ |
/* assign arbitrary spectrum */ |
114 |
+ |
double |
115 |
+ |
c_sset(C_COLOR *clr, double wlmin, double wlmax, const float spec[], int nwl) |
116 |
+ |
{ |
117 |
+ |
double yval, scale; |
118 |
+ |
float va[C_CNSS]; |
119 |
+ |
int i, pos, n, imax, wl; |
120 |
+ |
double wl0, wlstep; |
121 |
+ |
double boxpos, boxstep; |
122 |
+ |
/* check arguments */ |
123 |
+ |
if ((nwl <= 1) | (spec == NULL) | (wlmin >= C_CMAXWL) | |
124 |
+ |
(wlmax <= C_CMINWL) | (wlmin >= wlmax)) |
125 |
+ |
return(0.); |
126 |
+ |
wlstep = (wlmax - wlmin)/(nwl-1); |
127 |
+ |
while (wlmin < C_CMINWL) { |
128 |
+ |
wlmin += wlstep; |
129 |
+ |
--nwl; ++spec; |
130 |
+ |
} |
131 |
+ |
while (wlmax > C_CMAXWL) { |
132 |
+ |
wlmax -= wlstep; |
133 |
+ |
--nwl; |
134 |
+ |
} |
135 |
+ |
imax = nwl; /* box filter if necessary */ |
136 |
+ |
boxpos = 0; |
137 |
+ |
boxstep = 1; |
138 |
+ |
if (wlstep < C_CWLI) { |
139 |
+ |
imax = (wlmax - wlmin)/C_CWLI + 1e-7; |
140 |
+ |
boxpos = (wlmin - C_CMINWL)/C_CWLI; |
141 |
+ |
boxstep = wlstep/C_CWLI; |
142 |
+ |
wlstep = C_CWLI; |
143 |
+ |
} |
144 |
+ |
scale = 0.; /* get values and maximum */ |
145 |
+ |
yval = 0.; |
146 |
+ |
pos = 0; |
147 |
+ |
for (i = 0; i < imax; i++) { |
148 |
+ |
va[i] = 0.; n = 0; |
149 |
+ |
while (boxpos < i+.5 && pos < nwl) { |
150 |
+ |
va[i] += spec[pos++]; |
151 |
+ |
n++; |
152 |
+ |
boxpos += boxstep; |
153 |
+ |
} |
154 |
+ |
if (n > 1) |
155 |
+ |
va[i] /= (double)n; |
156 |
+ |
if (va[i] > scale) |
157 |
+ |
scale = va[i]; |
158 |
+ |
else if (va[i] < -scale) |
159 |
+ |
scale = -va[i]; |
160 |
+ |
yval += va[i] * cie_yf.ssamp[i]; |
161 |
+ |
} |
162 |
+ |
if (scale <= 1e-7) |
163 |
+ |
return(0.); |
164 |
+ |
yval /= (double)cie_yf.ssum; |
165 |
+ |
scale = C_CMAXV / scale; |
166 |
+ |
clr->ssum = 0; /* convert to our spacing */ |
167 |
+ |
wl0 = wlmin; |
168 |
+ |
pos = 0; |
169 |
+ |
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
170 |
+ |
if ((wl < wlmin) | (wl > wlmax)) |
171 |
+ |
clr->ssamp[i] = 0; |
172 |
+ |
else { |
173 |
+ |
while (wl0 + wlstep < wl+1e-7) { |
174 |
+ |
wl0 += wlstep; |
175 |
+ |
pos++; |
176 |
+ |
} |
177 |
+ |
if ((wl+1e-7 >= wl0) & (wl-1e-7 <= wl0)) |
178 |
+ |
clr->ssamp[i] = scale*va[pos] + .5; |
179 |
+ |
else /* interpolate if necessary */ |
180 |
+ |
clr->ssamp[i] = .5 + scale / wlstep * |
181 |
+ |
( va[pos]*(wl0+wlstep - wl) + |
182 |
+ |
va[pos+1]*(wl - wl0) ); |
183 |
+ |
clr->ssum += clr->ssamp[i]; |
184 |
+ |
} |
185 |
+ |
clr->flags = C_CDSPEC|C_CSSPEC; |
186 |
+ |
return(yval); |
187 |
+ |
} |
188 |
+ |
|
189 |
|
/* check if color is grey */ |
190 |
|
int |
191 |
|
c_isgrey(C_COLOR *clr) |
256 |
|
} |
257 |
|
} |
258 |
|
|
259 |
< |
/* mix two colors according to weights given -- cres can be c1 or c2 */ |
259 |
> |
/* mix two colors according to weights given -- cres may be c1 or c2 */ |
260 |
|
void |
261 |
|
c_cmix(C_COLOR *cres, double w1, C_COLOR *c1, double w2, C_COLOR *c2) |
262 |
|
{ |
263 |
|
double scale; |
135 |
– |
float cmix[C_CNSS]; |
264 |
|
int i; |
265 |
|
|
266 |
|
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
267 |
+ |
float cmix[C_CNSS]; |
268 |
+ |
|
269 |
|
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
270 |
|
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
271 |
|
w1 /= c1->eff*c1->ssum; |
275 |
|
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
276 |
|
if (cmix[i] > scale) |
277 |
|
scale = cmix[i]; |
278 |
+ |
else if (cmix[i] < -scale) |
279 |
+ |
scale = -cmix[i]; |
280 |
|
} |
281 |
|
scale = C_CMAXV / scale; |
282 |
|
cres->ssum = 0; |
300 |
|
} |
301 |
|
} |
302 |
|
|
303 |
+ |
/* multiply two colors -- cres may be c1 or c2 */ |
304 |
+ |
double |
305 |
+ |
c_cmult(C_COLOR *cres, C_COLOR *c1, double y1, C_COLOR *c2, double y2) |
306 |
+ |
{ |
307 |
+ |
double yres; |
308 |
+ |
int i; |
309 |
+ |
|
310 |
+ |
if ((c1->flags|c2->flags) & C_CDSPEC) { |
311 |
+ |
long cmix[C_CNSS], cmax = 0; /* spectral multiply */ |
312 |
+ |
|
313 |
+ |
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
314 |
+ |
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
315 |
+ |
for (i = 0; i < C_CNSS; i++) { |
316 |
+ |
cmix[i] = c1->ssamp[i] * c2->ssamp[i]; |
317 |
+ |
if (cmix[i] > cmax) |
318 |
+ |
cmax = cmix[i]; |
319 |
+ |
else if (cmix[i] < -cmax) |
320 |
+ |
cmax = -cmix[i]; |
321 |
+ |
} |
322 |
+ |
cmax /= C_CMAXV; |
323 |
+ |
if (!cmax) { |
324 |
+ |
*cres = c_dfcolor; |
325 |
+ |
return(0.); |
326 |
+ |
} |
327 |
+ |
cres->ssum = 0; |
328 |
+ |
for (i = 0; i < C_CNSS; i++) |
329 |
+ |
cres->ssum += cres->ssamp[i] = cmix[i] / cmax; |
330 |
+ |
cres->flags = C_CDSPEC|C_CSSPEC; |
331 |
+ |
|
332 |
+ |
c_ccvt(cres, C_CSEFF); /* nasty, but true */ |
333 |
+ |
yres = y1 * y2 * cie_yf.ssum * C_CLPWM / |
334 |
+ |
(c1->eff*c1->ssum * c2->eff*c2->ssum) * |
335 |
+ |
cres->eff*( cres->ssum*(double)cmax + |
336 |
+ |
C_CNSS/2.0*(cmax-1) ); |
337 |
+ |
} else { |
338 |
+ |
float rgb1[3], rgb2[3]; /* CIE xy multiply */ |
339 |
+ |
|
340 |
+ |
c_toSharpRGB(c1, y1, rgb1); |
341 |
+ |
c_toSharpRGB(c2, y2, rgb2); |
342 |
+ |
|
343 |
+ |
rgb2[0] *= rgb1[0]; rgb2[1] *= rgb1[1]; rgb2[2] *= rgb1[2]; |
344 |
+ |
|
345 |
+ |
yres = c_fromSharpRGB(rgb2, cres); |
346 |
+ |
} |
347 |
+ |
return(yres); |
348 |
+ |
} |
349 |
+ |
|
350 |
|
#define C1 3.741832e-16 /* W-m^2 */ |
351 |
|
#define C2 1.4388e-2 /* m-K */ |
352 |
|
|
353 |
|
#define bbsp(l,t) (C1/((l)*(l)*(l)*(l)*(l)*(exp(C2/((t)*(l)))-1.))) |
354 |
< |
#define bblm(t) (C2/5./(t)) |
354 |
> |
#define bblm(t) (C2*0.2/(t)) |
355 |
|
|
356 |
|
/* set black body spectrum */ |
357 |
|
int |