| 9 |
|
#include <math.h> |
| 10 |
|
#include "ccolor.h" |
| 11 |
|
|
| 12 |
+ |
/* Sharp primary matrix */ |
| 13 |
+ |
float XYZtoSharp[3][3] = { |
| 14 |
+ |
{ 1.2694, -0.0988, -0.1706}, |
| 15 |
+ |
{-0.8364, 1.8006, 0.0357}, |
| 16 |
+ |
{ 0.0297, -0.0315, 1.0018} |
| 17 |
+ |
}; |
| 18 |
+ |
/* inverse Sharp primary matrix */ |
| 19 |
+ |
float XYZfromSharp[3][3] = { |
| 20 |
+ |
{ 0.8156, 0.0472, 0.1372}, |
| 21 |
+ |
{ 0.3791, 0.5769, 0.0440}, |
| 22 |
+ |
{-0.0123, 0.0167, 0.9955} |
| 23 |
+ |
}; |
| 24 |
|
|
| 25 |
< |
C_COLOR c_dfcolor = C_DEFCOLOR; |
| 25 |
> |
const C_COLOR c_dfcolor = C_DEFCOLOR; |
| 26 |
|
|
| 27 |
|
/* CIE 1931 Standard Observer curves */ |
| 28 |
< |
static C_COLOR cie_xf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
| 28 |
> |
const C_COLOR c_x31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
| 29 |
|
{14,42,143,435,1344,2839,3483,3362,2908,1954,956, |
| 30 |
|
320,49,93,633,1655,2904,4334,5945,7621,9163,10263, |
| 31 |
|
10622,10026,8544,6424,4479,2835,1649,874,468,227, |
| 32 |
|
114,58,29,14,7,3,2,1,0}, 106836L, .467, .368, 362.230 |
| 33 |
|
}; |
| 34 |
< |
static C_COLOR cie_yf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
| 34 |
> |
const C_COLOR c_y31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
| 35 |
|
{0,1,4,12,40,116,230,380,600,910,1390,2080,3230, |
| 36 |
|
5030,7100,8620,9540,9950,9950,9520,8700,7570,6310, |
| 37 |
|
5030,3810,2650,1750,1070,610,320,170,82,41,21,10, |
| 38 |
|
5,2,1,1,0,0}, 106856L, .398, .542, 493.525 |
| 39 |
|
}; |
| 40 |
< |
static C_COLOR cie_zf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
| 40 |
> |
const C_COLOR c_z31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
| 41 |
|
{65,201,679,2074,6456,13856,17471,17721,16692, |
| 42 |
|
12876,8130,4652,2720,1582,782,422,203,87,39,21,17, |
| 43 |
|
11,8,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, |
| 44 |
|
106770L, .147, .077, 54.363 |
| 45 |
|
}; |
| 46 |
|
/* Derived CIE 1931 Primaries (imaginary) */ |
| 47 |
< |
static C_COLOR cie_xp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
| 47 |
> |
static const C_COLOR cie_xp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
| 48 |
|
{-174,-198,-195,-197,-202,-213,-235,-272,-333, |
| 49 |
|
-444,-688,-1232,-2393,-4497,-6876,-6758,-5256, |
| 50 |
|
-3100,-815,1320,3200,4782,5998,6861,7408,7754, |
| 52 |
|
8336,8336,8336,8336,8336,8336}, |
| 53 |
|
127424L, 1., .0, |
| 54 |
|
}; |
| 55 |
< |
static C_COLOR cie_yp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
| 55 |
> |
static const C_COLOR cie_yp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
| 56 |
|
{-451,-431,-431,-430,-427,-417,-399,-366,-312, |
| 57 |
|
-204,57,691,2142,4990,8810,9871,9122,7321,5145, |
| 58 |
|
3023,1123,-473,-1704,-2572,-3127,-3474,-3704, |
| 60 |
|
-4066,-4066,-4066,-4066,-4066,-4066}, |
| 61 |
|
-23035L, .0, 1., |
| 62 |
|
}; |
| 63 |
< |
static C_COLOR cie_zp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
| 63 |
> |
static const C_COLOR cie_zp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY, |
| 64 |
|
{4051,4054,4052,4053,4054,4056,4059,4064,4071, |
| 65 |
|
4074,4056,3967,3677,2933,1492,313,-440,-795, |
| 66 |
|
-904,-918,-898,-884,-869,-863,-855,-855,-851, |
| 69 |
|
36057L, .0, .0, |
| 70 |
|
}; |
| 71 |
|
|
| 72 |
+ |
|
| 73 |
+ |
/* convert to sharpened RGB color for low-error operations */ |
| 74 |
+ |
void |
| 75 |
+ |
c_toSharpRGB(C_COLOR *cin, double cieY, float cout[3]) |
| 76 |
+ |
{ |
| 77 |
+ |
double xyz[3]; |
| 78 |
+ |
|
| 79 |
+ |
c_ccvt(cin, C_CSXY); |
| 80 |
+ |
|
| 81 |
+ |
xyz[0] = cin->cx/cin->cy * cieY; |
| 82 |
+ |
xyz[1] = cieY; |
| 83 |
+ |
xyz[2] = (1. - cin->cx - cin->cy)/cin->cy * cieY; |
| 84 |
+ |
|
| 85 |
+ |
cout[0] = XYZtoSharp[0][0]*xyz[0] + XYZtoSharp[0][1]*xyz[1] + |
| 86 |
+ |
XYZtoSharp[0][2]*xyz[2]; |
| 87 |
+ |
cout[1] = XYZtoSharp[1][0]*xyz[0] + XYZtoSharp[1][1]*xyz[1] + |
| 88 |
+ |
XYZtoSharp[1][2]*xyz[2]; |
| 89 |
+ |
cout[2] = XYZtoSharp[2][0]*xyz[0] + XYZtoSharp[2][1]*xyz[1] + |
| 90 |
+ |
XYZtoSharp[2][2]*xyz[2]; |
| 91 |
+ |
} |
| 92 |
+ |
|
| 93 |
+ |
/* convert back from sharpened RGB color */ |
| 94 |
+ |
double |
| 95 |
+ |
c_fromSharpRGB(float cin[3], C_COLOR *cout) |
| 96 |
+ |
{ |
| 97 |
+ |
double xyz[3], sf; |
| 98 |
+ |
|
| 99 |
+ |
xyz[0] = XYZfromSharp[0][0]*cin[0] + XYZfromSharp[0][1]*cin[1] + |
| 100 |
+ |
XYZfromSharp[0][2]*cin[2]; |
| 101 |
+ |
xyz[1] = XYZfromSharp[1][0]*cin[0] + XYZfromSharp[1][1]*cin[1] + |
| 102 |
+ |
XYZfromSharp[1][2]*cin[2]; |
| 103 |
+ |
xyz[2] = XYZfromSharp[2][0]*cin[0] + XYZfromSharp[2][1]*cin[1] + |
| 104 |
+ |
XYZfromSharp[2][2]*cin[2]; |
| 105 |
+ |
|
| 106 |
+ |
sf = 1./(xyz[0] + xyz[1] + xyz[2]); |
| 107 |
+ |
|
| 108 |
+ |
cout->cx = xyz[0] * sf; |
| 109 |
+ |
cout->cy = xyz[1] * sf; |
| 110 |
+ |
cout->flags = C_CDXY|C_CSXY; |
| 111 |
+ |
|
| 112 |
+ |
return(xyz[1]); |
| 113 |
+ |
} |
| 114 |
+ |
|
| 115 |
+ |
/* assign arbitrary spectrum and return Y value */ |
| 116 |
+ |
double |
| 117 |
+ |
c_sset(C_COLOR *clr, double wlmin, double wlmax, const float spec[], int nwl) |
| 118 |
+ |
{ |
| 119 |
+ |
double yval, scale; |
| 120 |
+ |
float va[C_CNSS]; |
| 121 |
+ |
int i, pos, n, imax, wl; |
| 122 |
+ |
double wl0, wlstep; |
| 123 |
+ |
double boxpos, boxstep; |
| 124 |
+ |
/* check arguments */ |
| 125 |
+ |
if ((nwl <= 1) | (spec == NULL) | (wlmin >= C_CMAXWL) | |
| 126 |
+ |
(wlmax <= C_CMINWL) | (wlmin >= wlmax)) |
| 127 |
+ |
return(0.); |
| 128 |
+ |
wlstep = (wlmax - wlmin)/(nwl-1); |
| 129 |
+ |
while (wlmin < C_CMINWL) { |
| 130 |
+ |
wlmin += wlstep; |
| 131 |
+ |
--nwl; ++spec; |
| 132 |
+ |
} |
| 133 |
+ |
while (wlmax > C_CMAXWL) { |
| 134 |
+ |
wlmax -= wlstep; |
| 135 |
+ |
--nwl; |
| 136 |
+ |
} |
| 137 |
+ |
if ((nwl <= 1) | (wlmin >= wlmax)) |
| 138 |
+ |
return(0.); |
| 139 |
+ |
imax = nwl; /* box filter if necessary */ |
| 140 |
+ |
boxpos = 0; |
| 141 |
+ |
boxstep = 1; |
| 142 |
+ |
if (wlstep < C_CWLI) { |
| 143 |
+ |
imax = (wlmax - wlmin)/C_CWLI + 1e-7; |
| 144 |
+ |
boxpos = (wlmin - C_CMINWL)/C_CWLI; |
| 145 |
+ |
boxstep = wlstep/C_CWLI; |
| 146 |
+ |
wlstep = C_CWLI; |
| 147 |
+ |
} |
| 148 |
+ |
scale = 0.; /* get values and maximum */ |
| 149 |
+ |
yval = 0.; |
| 150 |
+ |
pos = 0; |
| 151 |
+ |
for (i = 0; i < imax; i++) { |
| 152 |
+ |
va[i] = 0.; n = 0; |
| 153 |
+ |
while (boxpos < i+.5 && pos < nwl) { |
| 154 |
+ |
va[i] += spec[pos++]; |
| 155 |
+ |
n++; |
| 156 |
+ |
boxpos += boxstep; |
| 157 |
+ |
} |
| 158 |
+ |
if (n > 1) |
| 159 |
+ |
va[i] /= (double)n; |
| 160 |
+ |
if (va[i] > scale) |
| 161 |
+ |
scale = va[i]; |
| 162 |
+ |
else if (va[i] < -scale) |
| 163 |
+ |
scale = -va[i]; |
| 164 |
+ |
yval += va[i] * c_y31.ssamp[i]; |
| 165 |
+ |
} |
| 166 |
+ |
if (scale <= 1e-7) |
| 167 |
+ |
return(0.); |
| 168 |
+ |
yval /= (double)c_y31.ssum; |
| 169 |
+ |
scale = C_CMAXV / scale; |
| 170 |
+ |
clr->ssum = 0; /* convert to our spacing */ |
| 171 |
+ |
wl0 = wlmin; |
| 172 |
+ |
pos = 0; |
| 173 |
+ |
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
| 174 |
+ |
if ((wl < wlmin) | (wl > wlmax)) |
| 175 |
+ |
clr->ssamp[i] = 0; |
| 176 |
+ |
else { |
| 177 |
+ |
while (wl0 + wlstep < wl+1e-7) { |
| 178 |
+ |
wl0 += wlstep; |
| 179 |
+ |
pos++; |
| 180 |
+ |
} |
| 181 |
+ |
if ((wl+1e-7 >= wl0) & (wl-1e-7 <= wl0)) |
| 182 |
+ |
clr->ssamp[i] = scale*va[pos] + .5; |
| 183 |
+ |
else /* interpolate if necessary */ |
| 184 |
+ |
clr->ssamp[i] = .5 + scale / wlstep * |
| 185 |
+ |
( va[pos]*(wl0+wlstep - wl) + |
| 186 |
+ |
va[pos+1]*(wl - wl0) ); |
| 187 |
+ |
clr->ssum += clr->ssamp[i]; |
| 188 |
+ |
} |
| 189 |
+ |
clr->flags = C_CDSPEC|C_CSSPEC; |
| 190 |
+ |
return(yval); |
| 191 |
+ |
} |
| 192 |
+ |
|
| 193 |
|
/* check if color is grey */ |
| 194 |
|
int |
| 195 |
|
c_isgrey(C_COLOR *clr) |
| 220 |
|
if (fl & C_CSXY) { /* cspec -> cxy */ |
| 221 |
|
x = y = z = 0.; |
| 222 |
|
for (i = 0; i < C_CNSS; i++) { |
| 223 |
< |
x += cie_xf.ssamp[i] * clr->ssamp[i]; |
| 224 |
< |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
| 225 |
< |
z += cie_zf.ssamp[i] * clr->ssamp[i]; |
| 223 |
> |
x += c_x31.ssamp[i] * clr->ssamp[i]; |
| 224 |
> |
y += c_y31.ssamp[i] * clr->ssamp[i]; |
| 225 |
> |
z += c_z31.ssamp[i] * clr->ssamp[i]; |
| 226 |
|
} |
| 227 |
< |
x /= (double)cie_xf.ssum; |
| 228 |
< |
y /= (double)cie_yf.ssum; |
| 229 |
< |
z /= (double)cie_zf.ssum; |
| 227 |
> |
x /= (double)c_x31.ssum; |
| 228 |
> |
y /= (double)c_y31.ssum; |
| 229 |
> |
z /= (double)c_z31.ssum; |
| 230 |
|
z += x + y; |
| 231 |
|
clr->cx = x / z; |
| 232 |
|
clr->cy = y / z; |
| 233 |
|
clr->flags |= C_CSXY; |
| 234 |
< |
} else if (fl & C_CSSPEC) { /* cxy -> cspec */ |
| 234 |
> |
} |
| 235 |
> |
if (fl & C_CSSPEC) { /* cxy -> cspec */ |
| 236 |
|
x = clr->cx; |
| 237 |
|
y = clr->cy; |
| 238 |
|
z = 1. - x - y; |
| 251 |
|
if (clr->flags & C_CSSPEC) { /* from spectrum */ |
| 252 |
|
y = 0.; |
| 253 |
|
for (i = 0; i < C_CNSS; i++) |
| 254 |
< |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
| 254 |
> |
y += c_y31.ssamp[i] * clr->ssamp[i]; |
| 255 |
|
clr->eff = C_CLPWM * y / clr->ssum; |
| 256 |
|
} else /* clr->flags & C_CSXY */ { /* from (x,y) */ |
| 257 |
< |
clr->eff = clr->cx*cie_xf.eff + clr->cy*cie_yf.eff + |
| 258 |
< |
(1. - clr->cx - clr->cy)*cie_zf.eff; |
| 257 |
> |
clr->eff = clr->cx*c_x31.eff + clr->cy*c_y31.eff + |
| 258 |
> |
(1. - clr->cx - clr->cy)*c_z31.eff; |
| 259 |
|
} |
| 260 |
|
clr->flags |= C_CSEFF; |
| 261 |
|
} |
| 262 |
|
} |
| 263 |
|
|
| 264 |
< |
/* mix two colors according to weights given -- cres can be c1 or c2 */ |
| 264 |
> |
/* mix two colors according to weights given -- cres may be c1 or c2 */ |
| 265 |
|
void |
| 266 |
|
c_cmix(C_COLOR *cres, double w1, C_COLOR *c1, double w2, C_COLOR *c2) |
| 267 |
|
{ |
| 268 |
|
double scale; |
| 135 |
– |
float cmix[C_CNSS]; |
| 269 |
|
int i; |
| 270 |
|
|
| 271 |
|
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
| 272 |
+ |
float cmix[C_CNSS]; |
| 273 |
+ |
|
| 274 |
|
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
| 275 |
|
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
| 276 |
|
w1 /= c1->eff*c1->ssum; |
| 280 |
|
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
| 281 |
|
if (cmix[i] > scale) |
| 282 |
|
scale = cmix[i]; |
| 283 |
+ |
else if (cmix[i] < -scale) |
| 284 |
+ |
scale = -cmix[i]; |
| 285 |
|
} |
| 286 |
|
scale = C_CMAXV / scale; |
| 287 |
|
cres->ssum = 0; |
| 305 |
|
} |
| 306 |
|
} |
| 307 |
|
|
| 308 |
+ |
/* multiply two colors -- cres may be c1 or c2 */ |
| 309 |
+ |
double |
| 310 |
+ |
c_cmult(C_COLOR *cres, C_COLOR *c1, double y1, C_COLOR *c2, double y2) |
| 311 |
+ |
{ |
| 312 |
+ |
double yres; |
| 313 |
+ |
int i; |
| 314 |
+ |
|
| 315 |
+ |
if ((c1->flags|c2->flags) & C_CDSPEC) { |
| 316 |
+ |
long cmix[C_CNSS], cmax = 0; /* spectral multiply */ |
| 317 |
+ |
|
| 318 |
+ |
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
| 319 |
+ |
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
| 320 |
+ |
for (i = 0; i < C_CNSS; i++) { |
| 321 |
+ |
cmix[i] = c1->ssamp[i] * c2->ssamp[i]; |
| 322 |
+ |
if (cmix[i] > cmax) |
| 323 |
+ |
cmax = cmix[i]; |
| 324 |
+ |
else if (cmix[i] < -cmax) |
| 325 |
+ |
cmax = -cmix[i]; |
| 326 |
+ |
} |
| 327 |
+ |
cmax /= C_CMAXV; |
| 328 |
+ |
if (!cmax) { |
| 329 |
+ |
*cres = c_dfcolor; |
| 330 |
+ |
return(0.); |
| 331 |
+ |
} |
| 332 |
+ |
cres->ssum = 0; |
| 333 |
+ |
for (i = 0; i < C_CNSS; i++) |
| 334 |
+ |
cres->ssum += cres->ssamp[i] = cmix[i] / cmax; |
| 335 |
+ |
cres->flags = C_CDSPEC|C_CSSPEC; |
| 336 |
+ |
|
| 337 |
+ |
c_ccvt(cres, C_CSEFF); /* below is correct */ |
| 338 |
+ |
yres = y1 * y2 * c_y31.ssum * C_CLPWM / |
| 339 |
+ |
(c1->eff*c1->ssum * c2->eff*c2->ssum) * |
| 340 |
+ |
cres->eff*( cres->ssum*(double)cmax + |
| 341 |
+ |
C_CNSS/2.0*(cmax-1) ); |
| 342 |
+ |
} else { |
| 343 |
+ |
float rgb1[3], rgb2[3]; /* CIE xy multiply */ |
| 344 |
+ |
|
| 345 |
+ |
c_toSharpRGB(c1, y1, rgb1); |
| 346 |
+ |
c_toSharpRGB(c2, y2, rgb2); |
| 347 |
+ |
|
| 348 |
+ |
rgb2[0] *= rgb1[0]; rgb2[1] *= rgb1[1]; rgb2[2] *= rgb1[2]; |
| 349 |
+ |
|
| 350 |
+ |
yres = c_fromSharpRGB(rgb2, cres); |
| 351 |
+ |
} |
| 352 |
+ |
return(yres); |
| 353 |
+ |
} |
| 354 |
+ |
|
| 355 |
|
#define C1 3.741832e-16 /* W-m^2 */ |
| 356 |
|
#define C2 1.4388e-2 /* m-K */ |
| 357 |
|
|
| 358 |
|
#define bbsp(l,t) (C1/((l)*(l)*(l)*(l)*(l)*(exp(C2/((t)*(l)))-1.))) |
| 359 |
< |
#define bblm(t) (C2/5./(t)) |
| 359 |
> |
#define bblm(t) (C2*0.2/(t)) |
| 360 |
|
|
| 361 |
|
/* set black body spectrum */ |
| 362 |
|
int |
