8 |
|
* Externals declared in color.h |
9 |
|
*/ |
10 |
|
|
11 |
< |
/* ==================================================================== |
12 |
< |
* The Radiance Software License, Version 1.0 |
13 |
< |
* |
14 |
< |
* Copyright (c) 1990 - 2002 The Regents of the University of California, |
15 |
< |
* through Lawrence Berkeley National Laboratory. All rights reserved. |
16 |
< |
* |
17 |
< |
* Redistribution and use in source and binary forms, with or without |
18 |
< |
* modification, are permitted provided that the following conditions |
19 |
< |
* are met: |
20 |
< |
* |
21 |
< |
* 1. Redistributions of source code must retain the above copyright |
22 |
< |
* notice, this list of conditions and the following disclaimer. |
23 |
< |
* |
24 |
< |
* 2. Redistributions in binary form must reproduce the above copyright |
25 |
< |
* notice, this list of conditions and the following disclaimer in |
26 |
< |
* the documentation and/or other materials provided with the |
27 |
< |
* distribution. |
28 |
< |
* |
29 |
< |
* 3. The end-user documentation included with the redistribution, |
30 |
< |
* if any, must include the following acknowledgment: |
31 |
< |
* "This product includes Radiance software |
32 |
< |
* (http://radsite.lbl.gov/) |
33 |
< |
* developed by the Lawrence Berkeley National Laboratory |
34 |
< |
* (http://www.lbl.gov/)." |
35 |
< |
* Alternately, this acknowledgment may appear in the software itself, |
36 |
< |
* if and wherever such third-party acknowledgments normally appear. |
37 |
< |
* |
38 |
< |
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
39 |
< |
* and "The Regents of the University of California" must |
40 |
< |
* not be used to endorse or promote products derived from this |
41 |
< |
* software without prior written permission. For written |
42 |
< |
* permission, please contact [email protected]. |
43 |
< |
* |
44 |
< |
* 5. Products derived from this software may not be called "Radiance", |
45 |
< |
* nor may "Radiance" appear in their name, without prior written |
46 |
< |
* permission of Lawrence Berkeley National Laboratory. |
47 |
< |
* |
48 |
< |
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
49 |
< |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
50 |
< |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
51 |
< |
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
52 |
< |
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
53 |
< |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
54 |
< |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
55 |
< |
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
56 |
< |
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
57 |
< |
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
58 |
< |
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
59 |
< |
* SUCH DAMAGE. |
60 |
< |
* ==================================================================== |
61 |
< |
* |
62 |
< |
* This software consists of voluntary contributions made by many |
63 |
< |
* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
64 |
< |
* information on Lawrence Berkeley National Laboratory, please see |
65 |
< |
* <http://www.lbl.gov/>. |
66 |
< |
*/ |
11 |
> |
#include "copyright.h" |
12 |
|
|
13 |
< |
#include "color.h" |
13 |
> |
#include <stdio.h> |
14 |
|
#include <string.h> |
15 |
+ |
#include "color.h" |
16 |
|
|
17 |
|
#define CEPS 1e-4 /* color epsilon */ |
18 |
|
|
91 |
|
|
92 |
|
|
93 |
|
void |
94 |
< |
spec_rgb(col, s, e) /* compute RGB color from spectral range */ |
95 |
< |
COLOR col; |
96 |
< |
int s, e; |
94 |
> |
spec_rgb( /* compute RGB color from spectral range */ |
95 |
> |
COLOR col, |
96 |
> |
int s, |
97 |
> |
int e |
98 |
> |
) |
99 |
|
{ |
100 |
|
COLOR ciecolor; |
101 |
|
|
105 |
|
|
106 |
|
|
107 |
|
void |
108 |
< |
spec_cie(col, s, e) /* compute a color from a spectral range */ |
109 |
< |
COLOR col; /* returned color */ |
110 |
< |
int s, e; /* starting and ending wavelengths */ |
108 |
> |
spec_cie( /* compute a color from a spectral range */ |
109 |
> |
COLOR col, /* returned color */ |
110 |
> |
int s, /* starting and ending wavelengths */ |
111 |
> |
int e |
112 |
> |
) |
113 |
|
{ |
114 |
|
register int i, d, r; |
115 |
|
|
142 |
|
|
143 |
|
|
144 |
|
void |
145 |
< |
cie_rgb(rgb, xyz) /* convert CIE color to standard RGB */ |
146 |
< |
COLOR rgb; |
147 |
< |
COLOR xyz; |
145 |
> |
cie_rgb( /* convert CIE color to standard RGB */ |
146 |
> |
COLOR rgb, |
147 |
> |
COLOR xyz |
148 |
> |
) |
149 |
|
{ |
150 |
|
colortrans(rgb, xyz2rgbmat, xyz); |
151 |
|
clipgamut(rgb, xyz[CIEY], CGAMUT_LOWER, cblack, cwhite); |
153 |
|
|
154 |
|
|
155 |
|
int |
156 |
< |
clipgamut(col, brt, gamut, lower, upper) /* clip to gamut cube */ |
157 |
< |
COLOR col; |
158 |
< |
double brt; |
159 |
< |
int gamut; |
160 |
< |
COLOR lower, upper; |
156 |
> |
clipgamut( /* clip to gamut cube */ |
157 |
> |
COLOR col, |
158 |
> |
double brt, |
159 |
> |
int gamut, |
160 |
> |
COLOR lower, |
161 |
> |
COLOR upper |
162 |
> |
) |
163 |
|
{ |
164 |
|
int rflags = 0; |
165 |
|
double brtmin, brtmax, v, vv; |
185 |
|
vv = 1.; /* check each limit */ |
186 |
|
for (i = 0; i < 3; i++) |
187 |
|
if (gamut & CGAMUT_LOWER && col[i] < lower[i]) { |
188 |
< |
v = (lower[i]+CEPS - cgry[i])/(col[i] - cgry[i]); |
188 |
> |
v = (lower[i] - cgry[i])/(col[i] - cgry[i]); |
189 |
|
if (v < vv) vv = v; |
190 |
|
rflags |= CGAMUT_LOWER; |
191 |
|
} else if (gamut & CGAMUT_UPPER && col[i] > upper[i]) { |
192 |
< |
v = (upper[i]-CEPS - cgry[i])/(col[i] - cgry[i]); |
192 |
> |
v = (upper[i] - cgry[i])/(col[i] - cgry[i]); |
193 |
|
if (v < vv) vv = v; |
194 |
|
rflags |= CGAMUT_UPPER; |
195 |
|
} |
201 |
|
|
202 |
|
|
203 |
|
void |
204 |
< |
colortrans(c2, mat, c1) /* convert c1 by mat and put into c2 */ |
205 |
< |
register COLOR c2; |
206 |
< |
register COLORMAT mat; |
207 |
< |
register COLOR c1; |
204 |
> |
colortrans( /* convert c1 by mat and put into c2 */ |
205 |
> |
register COLOR c2, |
206 |
> |
register COLORMAT mat, |
207 |
> |
register COLOR c1 |
208 |
> |
) |
209 |
|
{ |
210 |
|
COLOR cout; |
211 |
|
|
218 |
|
|
219 |
|
|
220 |
|
void |
221 |
< |
multcolormat(m3, m2, m1) /* multiply m1 by m2 and put into m3 */ |
222 |
< |
COLORMAT m3; /* m3 can be either m1 or m2 w/o harm */ |
223 |
< |
COLORMAT m2, m1; |
221 |
> |
multcolormat( /* multiply m1 by m2 and put into m3 */ |
222 |
> |
COLORMAT m3, /* m3 can be either m1 or m2 w/o harm */ |
223 |
> |
COLORMAT m2, |
224 |
> |
COLORMAT m1 |
225 |
> |
) |
226 |
|
{ |
227 |
|
COLORMAT mt; |
228 |
|
register int i, j; |
236 |
|
} |
237 |
|
|
238 |
|
|
239 |
< |
void |
240 |
< |
compxyz2rgbmat(mat, pr) /* compute conversion from CIE to RGB space */ |
241 |
< |
COLORMAT mat; |
242 |
< |
register RGBPRIMS pr; |
239 |
> |
int |
240 |
> |
colorprimsOK( /* are color primaries reasonable? */ |
241 |
> |
RGBPRIMS pr |
242 |
> |
) |
243 |
|
{ |
244 |
+ |
int i; |
245 |
+ |
|
246 |
+ |
for (i = 0; i < 4; i++) { |
247 |
+ |
if ((pr[i][CIEX] <= CEPS) | (pr[i][CIEY] <= CEPS)) |
248 |
+ |
return(0); |
249 |
+ |
if ((pr[i][CIEX] >= 1.-CEPS) | (pr[i][CIEY] >= 1.-CEPS)) |
250 |
+ |
return(0); |
251 |
+ |
} |
252 |
+ |
return(1); |
253 |
+ |
} |
254 |
+ |
|
255 |
+ |
|
256 |
+ |
|
257 |
+ |
int |
258 |
+ |
compxyz2rgbmat( /* compute conversion from CIE to RGB space */ |
259 |
+ |
COLORMAT mat, |
260 |
+ |
register RGBPRIMS pr |
261 |
+ |
) |
262 |
+ |
{ |
263 |
|
double C_rD, C_gD, C_bD; |
264 |
|
|
265 |
|
if (pr == stdprims) { /* can use xyz2rgbmat */ |
266 |
|
cpcolormat(mat, xyz2rgbmat); |
267 |
< |
return; |
267 |
> |
return(1); |
268 |
|
} |
269 |
+ |
if (CEQ(pr[WHT][CIEX],0.) | CEQ(pr[WHT][CIEY],0.)) |
270 |
+ |
return(0); |
271 |
|
C_rD = (1./pr[WHT][CIEY]) * |
272 |
|
( pr[WHT][CIEX]*(pr[GRN][CIEY] - pr[BLU][CIEY]) - |
273 |
|
pr[WHT][CIEY]*(pr[GRN][CIEX] - pr[BLU][CIEX]) + |
274 |
|
pr[GRN][CIEX]*pr[BLU][CIEY] - pr[BLU][CIEX]*pr[GRN][CIEY] ) ; |
275 |
+ |
if (CEQ(C_rD,0.)) |
276 |
+ |
return(0); |
277 |
|
C_gD = (1./pr[WHT][CIEY]) * |
278 |
|
( pr[WHT][CIEX]*(pr[BLU][CIEY] - pr[RED][CIEY]) - |
279 |
|
pr[WHT][CIEY]*(pr[BLU][CIEX] - pr[RED][CIEX]) - |
280 |
|
pr[RED][CIEX]*pr[BLU][CIEY] + pr[BLU][CIEX]*pr[RED][CIEY] ) ; |
281 |
+ |
if (CEQ(C_gD,0.)) |
282 |
+ |
return(0); |
283 |
|
C_bD = (1./pr[WHT][CIEY]) * |
284 |
|
( pr[WHT][CIEX]*(pr[RED][CIEY] - pr[GRN][CIEY]) - |
285 |
|
pr[WHT][CIEY]*(pr[RED][CIEX] - pr[GRN][CIEX]) + |
286 |
|
pr[RED][CIEX]*pr[GRN][CIEY] - pr[GRN][CIEX]*pr[RED][CIEY] ) ; |
287 |
< |
|
287 |
> |
if (CEQ(C_bD,0.)) |
288 |
> |
return(0); |
289 |
|
mat[0][0] = (pr[GRN][CIEY] - pr[BLU][CIEY] - |
290 |
|
pr[BLU][CIEX]*pr[GRN][CIEY] + |
291 |
|
pr[BLU][CIEY]*pr[GRN][CIEX])/C_rD ; |
310 |
|
pr[RED][CIEX]*pr[GRN][CIEY])/C_bD ; |
311 |
|
mat[2][2] = (pr[RED][CIEX]*pr[GRN][CIEY] - |
312 |
|
pr[GRN][CIEX]*pr[RED][CIEY])/C_bD ; |
313 |
+ |
return(1); |
314 |
|
} |
315 |
|
|
316 |
|
|
317 |
< |
void |
318 |
< |
comprgb2xyzmat(mat, pr) /* compute conversion from RGB to CIE space */ |
319 |
< |
COLORMAT mat; |
320 |
< |
register RGBPRIMS pr; |
317 |
> |
int |
318 |
> |
comprgb2xyzmat( /* compute conversion from RGB to CIE space */ |
319 |
> |
COLORMAT mat, |
320 |
> |
register RGBPRIMS pr |
321 |
> |
) |
322 |
|
{ |
323 |
|
double C_rD, C_gD, C_bD, D; |
324 |
|
|
325 |
|
if (pr == stdprims) { /* can use rgb2xyzmat */ |
326 |
|
cpcolormat(mat, rgb2xyzmat); |
327 |
< |
return; |
327 |
> |
return(1); |
328 |
|
} |
329 |
+ |
if (CEQ(pr[WHT][CIEX],0.) | CEQ(pr[WHT][CIEY],0.)) |
330 |
+ |
return(0); |
331 |
|
C_rD = (1./pr[WHT][CIEY]) * |
332 |
|
( pr[WHT][CIEX]*(pr[GRN][CIEY] - pr[BLU][CIEY]) - |
333 |
|
pr[WHT][CIEY]*(pr[GRN][CIEX] - pr[BLU][CIEX]) + |
343 |
|
D = pr[RED][CIEX]*(pr[GRN][CIEY] - pr[BLU][CIEY]) + |
344 |
|
pr[GRN][CIEX]*(pr[BLU][CIEY] - pr[RED][CIEY]) + |
345 |
|
pr[BLU][CIEX]*(pr[RED][CIEY] - pr[GRN][CIEY]) ; |
346 |
+ |
if (CEQ(D,0.)) |
347 |
+ |
return(0); |
348 |
|
mat[0][0] = pr[RED][CIEX]*C_rD/D; |
349 |
|
mat[0][1] = pr[GRN][CIEX]*C_gD/D; |
350 |
|
mat[0][2] = pr[BLU][CIEX]*C_bD/D; |
354 |
|
mat[2][0] = (1.-pr[RED][CIEX]-pr[RED][CIEY])*C_rD/D; |
355 |
|
mat[2][1] = (1.-pr[GRN][CIEX]-pr[GRN][CIEY])*C_gD/D; |
356 |
|
mat[2][2] = (1.-pr[BLU][CIEX]-pr[BLU][CIEY])*C_bD/D; |
357 |
+ |
return(1); |
358 |
|
} |
359 |
|
|
360 |
|
|
361 |
< |
void |
362 |
< |
comprgb2rgbmat(mat, pr1, pr2) /* compute conversion from RGB1 to RGB2 */ |
363 |
< |
COLORMAT mat; |
364 |
< |
RGBPRIMS pr1, pr2; |
361 |
> |
int |
362 |
> |
comprgb2rgbmat( /* compute conversion from RGB1 to RGB2 */ |
363 |
> |
COLORMAT mat, |
364 |
> |
RGBPRIMS pr1, |
365 |
> |
RGBPRIMS pr2 |
366 |
> |
) |
367 |
|
{ |
368 |
|
COLORMAT pr1toxyz, xyztopr2; |
369 |
|
|
371 |
|
mat[0][0] = mat[1][1] = mat[2][2] = 1.0; |
372 |
|
mat[0][1] = mat[0][2] = mat[1][0] = |
373 |
|
mat[1][2] = mat[2][0] = mat[2][1] = 0.0; |
374 |
< |
return; |
374 |
> |
return(1); |
375 |
|
} |
376 |
< |
comprgb2xyzmat(pr1toxyz, pr1); |
377 |
< |
compxyz2rgbmat(xyztopr2, pr2); |
376 |
> |
if (!comprgb2xyzmat(pr1toxyz, pr1)) |
377 |
> |
return(0); |
378 |
> |
if (!compxyz2rgbmat(xyztopr2, pr2)) |
379 |
> |
return(0); |
380 |
|
/* combine transforms */ |
381 |
|
multcolormat(mat, pr1toxyz, xyztopr2); |
382 |
+ |
return(1); |
383 |
|
} |
384 |
|
|
385 |
|
|
386 |
< |
void |
387 |
< |
compxyzWBmat(mat, wht1, wht2) /* CIE von Kries transform from wht1 to wht2 */ |
388 |
< |
COLORMAT mat; |
389 |
< |
float wht1[2], wht2[2]; |
386 |
> |
int |
387 |
> |
compxyzWBmat( /* CIE von Kries transform from wht1 to wht2 */ |
388 |
> |
COLORMAT mat, |
389 |
> |
float wht1[2], |
390 |
> |
float wht2[2] |
391 |
> |
) |
392 |
|
{ |
393 |
|
COLOR cw1, cw2; |
394 |
|
if (XYEQ(wht1,wht2)) { |
395 |
|
mat[0][0] = mat[1][1] = mat[2][2] = 1.0; |
396 |
|
mat[0][1] = mat[0][2] = mat[1][0] = |
397 |
|
mat[1][2] = mat[2][0] = mat[2][1] = 0.0; |
398 |
< |
return; |
398 |
> |
return(1); |
399 |
|
} |
400 |
+ |
if (CEQ(wht1[CIEX],0.) | CEQ(wht1[CIEY],0.)) |
401 |
+ |
return(0); |
402 |
|
cw1[RED] = wht1[CIEX]/wht1[CIEY]; |
403 |
|
cw1[GRN] = 1.; |
404 |
|
cw1[BLU] = (1. - wht1[CIEX] - wht1[CIEY])/wht1[CIEY]; |
405 |
|
colortrans(cw1, vkmat, cw1); |
406 |
+ |
if (CEQ(wht2[CIEX],0.) | CEQ(wht2[CIEY],0.)) |
407 |
+ |
return(0); |
408 |
|
cw2[RED] = wht2[CIEX]/wht2[CIEY]; |
409 |
|
cw2[GRN] = 1.; |
410 |
|
cw2[BLU] = (1. - wht2[CIEX] - wht2[CIEY])/wht2[CIEY]; |
411 |
|
colortrans(cw2, vkmat, cw2); |
412 |
+ |
if (CEQ(cw1[RED],0.) | CEQ(cw1[GRN],0.) | CEQ(cw1[BLU],0.)) |
413 |
+ |
return(0); |
414 |
|
mat[0][0] = cw2[RED]/cw1[RED]; |
415 |
|
mat[1][1] = cw2[GRN]/cw1[GRN]; |
416 |
|
mat[2][2] = cw2[BLU]/cw1[BLU]; |
418 |
|
mat[1][2] = mat[2][0] = mat[2][1] = 0.0; |
419 |
|
multcolormat(mat, vkmat, mat); |
420 |
|
multcolormat(mat, mat, ivkmat); |
421 |
+ |
return(1); |
422 |
|
} |
423 |
|
|
424 |
|
|
425 |
< |
void |
426 |
< |
compxyz2rgbWBmat(mat, pr) /* von Kries conversion from CIE to RGB space */ |
427 |
< |
COLORMAT mat; |
428 |
< |
RGBPRIMS pr; |
425 |
> |
int |
426 |
> |
compxyz2rgbWBmat( /* von Kries conversion from CIE to RGB space */ |
427 |
> |
COLORMAT mat, |
428 |
> |
RGBPRIMS pr |
429 |
> |
) |
430 |
|
{ |
431 |
|
COLORMAT wbmat; |
432 |
|
|
433 |
< |
compxyz2rgbmat(mat, pr); |
433 |
> |
if (!compxyz2rgbmat(mat, pr)) |
434 |
> |
return(0); |
435 |
|
if (XYEQ(pr[WHT],xyneu)) |
436 |
< |
return; |
437 |
< |
compxyzWBmat(wbmat, xyneu, pr[WHT]); |
436 |
> |
return(1); |
437 |
> |
if (!compxyzWBmat(wbmat, xyneu, pr[WHT])) |
438 |
> |
return(0); |
439 |
|
multcolormat(mat, wbmat, mat); |
440 |
+ |
return(1); |
441 |
|
} |
442 |
|
|
443 |
< |
void |
444 |
< |
comprgb2xyzWBmat(mat, pr) /* von Kries conversion from RGB to CIE space */ |
445 |
< |
COLORMAT mat; |
446 |
< |
RGBPRIMS pr; |
443 |
> |
int |
444 |
> |
comprgb2xyzWBmat( /* von Kries conversion from RGB to CIE space */ |
445 |
> |
COLORMAT mat, |
446 |
> |
RGBPRIMS pr |
447 |
> |
) |
448 |
|
{ |
449 |
|
COLORMAT wbmat; |
450 |
|
|
451 |
< |
comprgb2xyzmat(mat, pr); |
451 |
> |
if (!comprgb2xyzmat(mat, pr)) |
452 |
> |
return(0); |
453 |
|
if (XYEQ(pr[WHT],xyneu)) |
454 |
< |
return; |
455 |
< |
compxyzWBmat(wbmat, pr[WHT], xyneu); |
454 |
> |
return(1); |
455 |
> |
if (!compxyzWBmat(wbmat, pr[WHT], xyneu)) |
456 |
> |
return(0); |
457 |
|
multcolormat(mat, mat, wbmat); |
458 |
+ |
return(1); |
459 |
|
} |
460 |
|
|
461 |
< |
void |
462 |
< |
comprgb2rgbWBmat(mat, pr1, pr2) /* von Kries conversion from RGB1 to RGB2 */ |
463 |
< |
COLORMAT mat; |
464 |
< |
RGBPRIMS pr1, pr2; |
461 |
> |
int |
462 |
> |
comprgb2rgbWBmat( /* von Kries conversion from RGB1 to RGB2 */ |
463 |
> |
COLORMAT mat, |
464 |
> |
RGBPRIMS pr1, |
465 |
> |
RGBPRIMS pr2 |
466 |
> |
) |
467 |
|
{ |
468 |
|
COLORMAT pr1toxyz, xyztopr2, wbmat; |
469 |
|
|
471 |
|
mat[0][0] = mat[1][1] = mat[2][2] = 1.0; |
472 |
|
mat[0][1] = mat[0][2] = mat[1][0] = |
473 |
|
mat[1][2] = mat[2][0] = mat[2][1] = 0.0; |
474 |
< |
return; |
474 |
> |
return(1); |
475 |
|
} |
476 |
< |
comprgb2xyzmat(pr1toxyz, pr1); |
477 |
< |
compxyzWBmat(wbmat, pr1[WHT], pr2[WHT]); |
478 |
< |
compxyz2rgbmat(xyztopr2, pr2); |
476 |
> |
if (!comprgb2xyzmat(pr1toxyz, pr1)) |
477 |
> |
return(0); |
478 |
> |
if (!compxyzWBmat(wbmat, pr1[WHT], pr2[WHT])) |
479 |
> |
return(0); |
480 |
> |
if (!compxyz2rgbmat(xyztopr2, pr2)) |
481 |
> |
return(0); |
482 |
|
/* combine transforms */ |
483 |
|
multcolormat(mat, pr1toxyz, wbmat); |
484 |
|
multcolormat(mat, mat, xyztopr2); |
485 |
+ |
return(1); |
486 |
|
} |