6 |
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*/ |
7 |
|
|
8 |
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#include <stdio.h> |
9 |
+ |
#include <stdlib.h> |
10 |
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#include <math.h> |
11 |
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#include "ccolor.h" |
12 |
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|
13 |
+ |
#undef frand |
14 |
+ |
#define frand() (rand()*(1./(RAND_MAX+.5))) |
15 |
+ |
|
16 |
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/* Sharp primary matrix */ |
17 |
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float XYZtoSharp[3][3] = { |
18 |
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{ 1.2694, -0.0988, -0.1706}, |
26 |
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{-0.0123, 0.0167, 0.9955} |
27 |
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}; |
28 |
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|
29 |
< |
C_COLOR c_dfcolor = C_DEFCOLOR; |
29 |
> |
const C_COLOR c_dfcolor = C_DEFCOLOR; |
30 |
|
|
31 |
+ |
const C_CHROMA c_dfchroma = 49750; /* c_encodeChroma(&c_dfcolor) */ |
32 |
+ |
|
33 |
|
/* CIE 1931 Standard Observer curves */ |
34 |
< |
static const C_COLOR cie_xf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
34 |
> |
const C_COLOR c_x31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
35 |
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{14,42,143,435,1344,2839,3483,3362,2908,1954,956, |
36 |
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320,49,93,633,1655,2904,4334,5945,7621,9163,10263, |
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10622,10026,8544,6424,4479,2835,1649,874,468,227, |
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114,58,29,14,7,3,2,1,0}, 106836L, .467, .368, 362.230 |
39 |
|
}; |
40 |
< |
static const C_COLOR cie_yf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
40 |
> |
const C_COLOR c_y31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
41 |
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{0,1,4,12,40,116,230,380,600,910,1390,2080,3230, |
42 |
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5030,7100,8620,9540,9950,9950,9520,8700,7570,6310, |
43 |
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5030,3810,2650,1750,1070,610,320,170,82,41,21,10, |
44 |
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5,2,1,1,0,0}, 106856L, .398, .542, 493.525 |
45 |
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}; |
46 |
< |
static const C_COLOR cie_zf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
46 |
> |
const C_COLOR c_z31 = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF, |
47 |
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{65,201,679,2074,6456,13856,17471,17721,16692, |
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12876,8130,4652,2720,1582,782,422,203,87,39,21,17, |
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11,8,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, |
102 |
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{ |
103 |
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double xyz[3], sf; |
104 |
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|
99 |
– |
xyz[0] = XYZfromSharp[0][0]*cin[0] + XYZfromSharp[0][1]*cin[1] + |
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– |
XYZfromSharp[0][2]*cin[2]; |
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xyz[1] = XYZfromSharp[1][0]*cin[0] + XYZfromSharp[1][1]*cin[1] + |
106 |
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XYZfromSharp[1][2]*cin[2]; |
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+ |
if (xyz[1] <= 1e-6) { |
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+ |
*cout = c_dfcolor; /* punting, here... */ |
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+ |
return xyz[1]; |
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} |
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xyz[0] = XYZfromSharp[0][0]*cin[0] + XYZfromSharp[0][1]*cin[1] + |
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XYZfromSharp[0][2]*cin[2]; |
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xyz[2] = XYZfromSharp[2][0]*cin[0] + XYZfromSharp[2][1]*cin[1] + |
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XYZfromSharp[2][2]*cin[2]; |
115 |
< |
|
115 |
> |
|
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sf = 1./(xyz[0] + xyz[1] + xyz[2]); |
117 |
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|
118 |
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cout->cx = xyz[0] * sf; |
122 |
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return(xyz[1]); |
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} |
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|
125 |
< |
/* assign arbitrary spectrum */ |
125 |
> |
/* assign arbitrary spectrum and return Y value */ |
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double |
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c_sset(C_COLOR *clr, double wlmin, double wlmax, const float spec[], int nwl) |
128 |
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{ |
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wlmax -= wlstep; |
145 |
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--nwl; |
146 |
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} |
147 |
+ |
if ((nwl <= 1) | (wlmin >= wlmax)) |
148 |
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return(0.); |
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imax = nwl; /* box filter if necessary */ |
150 |
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boxpos = 0; |
151 |
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boxstep = 1; |
171 |
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scale = va[i]; |
172 |
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else if (va[i] < -scale) |
173 |
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scale = -va[i]; |
174 |
< |
yval += va[i] * cie_yf.ssamp[i]; |
174 |
> |
yval += va[i] * c_y31.ssamp[i]; |
175 |
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} |
176 |
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if (scale <= 1e-7) |
177 |
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return(0.); |
178 |
< |
yval /= (double)cie_yf.ssum; |
178 |
> |
yval /= (double)c_y31.ssum; |
179 |
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scale = C_CMAXV / scale; |
180 |
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clr->ssum = 0; /* convert to our spacing */ |
181 |
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wl0 = wlmin; |
189 |
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pos++; |
190 |
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} |
191 |
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if ((wl+1e-7 >= wl0) & (wl-1e-7 <= wl0)) |
192 |
< |
clr->ssamp[i] = scale*va[pos] + .5; |
192 |
> |
clr->ssamp[i] = scale*va[pos] + frand(); |
193 |
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else /* interpolate if necessary */ |
194 |
< |
clr->ssamp[i] = .5 + scale / wlstep * |
194 |
> |
clr->ssamp[i] = frand() + scale / wlstep * |
195 |
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( va[pos]*(wl0+wlstep - wl) + |
196 |
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va[pos+1]*(wl - wl0) ); |
197 |
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clr->ssum += clr->ssamp[i]; |
230 |
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if (fl & C_CSXY) { /* cspec -> cxy */ |
231 |
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x = y = z = 0.; |
232 |
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for (i = 0; i < C_CNSS; i++) { |
233 |
< |
x += cie_xf.ssamp[i] * clr->ssamp[i]; |
234 |
< |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
235 |
< |
z += cie_zf.ssamp[i] * clr->ssamp[i]; |
233 |
> |
x += c_x31.ssamp[i] * clr->ssamp[i]; |
234 |
> |
y += c_y31.ssamp[i] * clr->ssamp[i]; |
235 |
> |
z += c_z31.ssamp[i] * clr->ssamp[i]; |
236 |
|
} |
237 |
< |
x /= (double)cie_xf.ssum; |
238 |
< |
y /= (double)cie_yf.ssum; |
239 |
< |
z /= (double)cie_zf.ssum; |
237 |
> |
x /= (double)c_x31.ssum; |
238 |
> |
y /= (double)c_y31.ssum; |
239 |
> |
z /= (double)c_z31.ssum; |
240 |
|
z += x + y; |
241 |
< |
clr->cx = x / z; |
242 |
< |
clr->cy = y / z; |
241 |
> |
if (z > 1e-6) { |
242 |
> |
clr->cx = x / z; |
243 |
> |
clr->cy = y / z; |
244 |
> |
} else |
245 |
> |
clr->cx = clr->cy = 1./3.; |
246 |
|
clr->flags |= C_CSXY; |
247 |
< |
} else if (fl & C_CSSPEC) { /* cxy -> cspec */ |
247 |
> |
} |
248 |
> |
if (fl & C_CSSPEC) { /* cxy -> cspec */ |
249 |
|
x = clr->cx; |
250 |
|
y = clr->cy; |
251 |
|
z = 1. - x - y; |
252 |
|
clr->ssum = 0; |
253 |
|
for (i = 0; i < C_CNSS; i++) { |
254 |
|
clr->ssamp[i] = x*cie_xp.ssamp[i] + y*cie_yp.ssamp[i] |
255 |
< |
+ z*cie_zp.ssamp[i] + .5; |
255 |
> |
+ z*cie_zp.ssamp[i] + frand(); |
256 |
|
if (clr->ssamp[i] < 0) /* out of gamut! */ |
257 |
|
clr->ssamp[i] = 0; |
258 |
|
else |
264 |
|
if (clr->flags & C_CSSPEC) { /* from spectrum */ |
265 |
|
y = 0.; |
266 |
|
for (i = 0; i < C_CNSS; i++) |
267 |
< |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
268 |
< |
clr->eff = C_CLPWM * y / clr->ssum; |
267 |
> |
y += c_y31.ssamp[i] * clr->ssamp[i]; |
268 |
> |
clr->eff = C_CLPWM * y / (clr->ssum + 0.0001); |
269 |
|
} else /* clr->flags & C_CSXY */ { /* from (x,y) */ |
270 |
< |
clr->eff = clr->cx*cie_xf.eff + clr->cy*cie_yf.eff + |
271 |
< |
(1. - clr->cx - clr->cy)*cie_zf.eff; |
270 |
> |
clr->eff = clr->cx*c_x31.eff + clr->cy*c_y31.eff + |
271 |
> |
(1. - clr->cx - clr->cy)*c_z31.eff; |
272 |
|
} |
273 |
|
clr->flags |= C_CSEFF; |
274 |
|
} |
281 |
|
double scale; |
282 |
|
int i; |
283 |
|
|
284 |
+ |
if (w1 == 0) { |
285 |
+ |
*cres = *c2; |
286 |
+ |
return; |
287 |
+ |
} |
288 |
+ |
if (w2 == 0) { |
289 |
+ |
*cres = *c1; |
290 |
+ |
return; |
291 |
+ |
} |
292 |
|
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
293 |
|
float cmix[C_CNSS]; |
294 |
|
|
295 |
|
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
296 |
|
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
297 |
+ |
if (c1->ssum*c2->ssum == 0) { |
298 |
+ |
*cres = c_dfcolor; |
299 |
+ |
return; |
300 |
+ |
} |
301 |
|
w1 /= c1->eff*c1->ssum; |
302 |
|
w2 /= c2->eff*c2->ssum; |
303 |
|
scale = 0.; |
311 |
|
scale = C_CMAXV / scale; |
312 |
|
cres->ssum = 0; |
313 |
|
for (i = 0; i < C_CNSS; i++) |
314 |
< |
cres->ssum += cres->ssamp[i] = scale*cmix[i] + .5; |
314 |
> |
cres->ssum += cres->ssamp[i] = scale*cmix[i] + frand(); |
315 |
|
cres->flags = C_CDSPEC|C_CSSPEC; |
316 |
|
} else { /* CIE xy mixing */ |
317 |
|
c_ccvt(c1, C_CSXY); |
359 |
|
cres->ssum += cres->ssamp[i] = cmix[i] / cmax; |
360 |
|
cres->flags = C_CDSPEC|C_CSSPEC; |
361 |
|
|
362 |
< |
c_ccvt(cres, C_CSEFF); /* nasty, but true */ |
363 |
< |
yres = y1 * y2 * cie_yf.ssum * C_CLPWM / |
362 |
> |
c_ccvt(cres, C_CSEFF); /* below is correct */ |
363 |
> |
yres = y1 * y2 * c_y31.ssum * C_CLPWM / |
364 |
|
(c1->eff*c1->ssum * c2->eff*c2->ssum) * |
365 |
|
cres->eff*( cres->ssum*(double)cmax + |
366 |
|
C_CNSS/2.0*(cmax-1) ); |
401 |
|
clr->ssum = 0; |
402 |
|
for (i = 0; i < C_CNSS; i++) { |
403 |
|
wl = (C_CMINWL + i*C_CWLI)*1e-9; |
404 |
< |
clr->ssum += clr->ssamp[i] = sf*bbsp(wl,tk) + .5; |
404 |
> |
clr->ssum += clr->ssamp[i] = sf*bbsp(wl,tk) + frand(); |
405 |
|
} |
406 |
|
clr->flags = C_CDSPEC|C_CSSPEC; |
407 |
|
return(1); |
411 |
|
#undef C2 |
412 |
|
#undef bbsp |
413 |
|
#undef bblm |
414 |
+ |
|
415 |
+ |
#define UV_NORMF 410. |
416 |
+ |
|
417 |
+ |
/* encode (x,y) chromaticity */ |
418 |
+ |
C_CHROMA |
419 |
+ |
c_encodeChroma(C_COLOR *clr) |
420 |
+ |
{ |
421 |
+ |
double df; |
422 |
+ |
int ub, vb; |
423 |
+ |
|
424 |
+ |
c_ccvt(clr, C_CSXY); |
425 |
+ |
df = UV_NORMF/(-2.*clr->cx + 12.*clr->cy + 3.); |
426 |
+ |
ub = 4.*clr->cx*df + frand(); |
427 |
+ |
if (ub > 0xff) ub = 0xff; |
428 |
+ |
else ub *= (ub > 0); |
429 |
+ |
vb = 9.*clr->cy*df + frand(); |
430 |
+ |
if (vb > 0xff) vb = 0xff; |
431 |
+ |
else vb *= (vb > 0); |
432 |
+ |
|
433 |
+ |
return(vb<<8 | ub); |
434 |
+ |
} |
435 |
+ |
|
436 |
+ |
/* decode (x,y) chromaticity */ |
437 |
+ |
void |
438 |
+ |
c_decodeChroma(C_COLOR *cres, C_CHROMA ccode) |
439 |
+ |
{ |
440 |
+ |
double up = (ccode & 0xff)*(1./UV_NORMF); |
441 |
+ |
double vp = (ccode>>8 & 0xff)*(1./UV_NORMF); |
442 |
+ |
double df = 1./(6.*up - 16.*vp + 12.); |
443 |
+ |
|
444 |
+ |
cres->cx = 9.*up * df; |
445 |
+ |
cres->cy = 4.*vp * df; |
446 |
+ |
cres->flags = C_CDXY|C_CSXY; |
447 |
+ |
} |
448 |
+ |
|
449 |
+ |
#undef UV_NORMF |