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Commit | Line | Data |
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ac884b6a MS |
1 | /* |
2 | * "$Id$" | |
3 | * | |
4 | * CMYK color separation code for CUPS. | |
5 | * | |
71e16022 | 6 | * Copyright 2007-2010 by Apple Inc. |
ac884b6a MS |
7 | * Copyright 1993-2005 by Easy Software Products. |
8 | * | |
9 | * These coded instructions, statements, and computer programs are the | |
10 | * property of Apple Inc. and are protected by Federal copyright | |
11 | * law. Distribution and use rights are outlined in the file "LICENSE.txt" | |
12 | * which should have been included with this file. If this file is | |
13 | * file is missing or damaged, see the license at "http://www.cups.org/". | |
14 | * | |
15 | * Contents: | |
16 | * | |
17 | * cupsCMYKDelete() - Delete a color separation. | |
18 | * cupsCMYKDoBlack() - Do a black separation... | |
19 | * cupsCMYKDoCMYK() - Do a CMYK separation... | |
20 | * cupsCMYKDoGray() - Do a grayscale separation... | |
21 | * cupsCMYKDoRGB() - Do an sRGB separation... | |
22 | * cupsCMYKLoad() - Load a CMYK color profile from PPD attributes. | |
23 | * cupsCMYKNew() - Create a new CMYK color separation. | |
24 | * cupsCMYKSetBlack() - Set the transition range for CMY to black. | |
25 | * cupsCMYKSetCurve() - Set a color transform curve using points. | |
26 | * cupsCMYKSetGamma() - Set a color transform curve using gamma and | |
27 | * density. | |
28 | * cupsCMYKSetInkLimit() - Set the limit on the amount of ink. | |
29 | * cupsCMYKSetLtDk() - Set light/dark ink transforms. | |
30 | */ | |
31 | ||
32 | /* | |
33 | * Include necessary headers. | |
34 | */ | |
35 | ||
36 | #include "driver.h" | |
71e16022 | 37 | #include <cups/string-private.h> |
ac884b6a MS |
38 | |
39 | ||
40 | /* | |
41 | * 'cupsCMYKDelete()' - Delete a color separation. | |
42 | */ | |
43 | ||
44 | void | |
45 | cupsCMYKDelete(cups_cmyk_t *cmyk) /* I - Color separation */ | |
46 | { | |
47 | /* | |
48 | * Range check input... | |
49 | */ | |
50 | ||
51 | if (cmyk == NULL) | |
52 | return; | |
53 | ||
54 | /* | |
55 | * Free memory used... | |
56 | */ | |
57 | ||
58 | free(cmyk->channels[0]); | |
59 | free(cmyk); | |
60 | } | |
61 | ||
62 | ||
63 | /* | |
64 | * 'cupsCMYKDoBlack()' - Do a black separation... | |
65 | */ | |
66 | ||
67 | void | |
68 | cupsCMYKDoBlack(const cups_cmyk_t *cmyk, | |
69 | /* I - Color separation */ | |
70 | const unsigned char *input, | |
71 | /* I - Input grayscale pixels */ | |
72 | short *output, | |
73 | /* O - Output Device-N pixels */ | |
74 | int num_pixels) | |
75 | /* I - Number of pixels */ | |
76 | { | |
77 | int k; /* Current black value */ | |
78 | const short **channels; /* Copy of channel LUTs */ | |
ac884b6a MS |
79 | int ink, /* Amount of ink */ |
80 | ink_limit; /* Ink limit from separation */ | |
81 | ||
82 | ||
83 | /* | |
84 | * Range check input... | |
85 | */ | |
86 | ||
87 | if (cmyk == NULL || input == NULL || output == NULL || num_pixels <= 0) | |
88 | return; | |
89 | ||
90 | /* | |
91 | * Loop through it all... | |
92 | */ | |
93 | ||
94 | channels = (const short **)cmyk->channels; | |
ac884b6a MS |
95 | ink_limit = cmyk->ink_limit; |
96 | ||
97 | switch (cmyk->num_channels) | |
98 | { | |
99 | case 1 : /* Black */ | |
100 | while (num_pixels > 0) | |
101 | { | |
102 | /* | |
103 | * Get the input black value and then set the corresponding color | |
104 | * channel values... | |
105 | */ | |
106 | ||
107 | k = *input++; | |
108 | *output++ = channels[0][k]; | |
109 | ||
110 | num_pixels --; | |
111 | } | |
112 | break; | |
113 | ||
114 | case 2 : /* Black, light black */ | |
115 | while (num_pixels > 0) | |
116 | { | |
117 | /* | |
118 | * Get the input black value and then set the corresponding color | |
119 | * channel values... | |
120 | */ | |
121 | ||
122 | k = *input++; | |
123 | output[0] = channels[0][k]; | |
124 | output[1] = channels[1][k]; | |
125 | ||
126 | if (ink_limit) | |
127 | { | |
128 | ink = output[0] + output[1]; | |
129 | ||
130 | if (ink > ink_limit) | |
131 | { | |
132 | output[0] = ink_limit * output[0] / ink; | |
133 | output[1] = ink_limit * output[1] / ink; | |
134 | } | |
135 | } | |
136 | ||
137 | output += 2; | |
138 | num_pixels --; | |
139 | } | |
140 | break; | |
141 | ||
142 | case 3 : /* CMY */ | |
143 | while (num_pixels > 0) | |
144 | { | |
145 | /* | |
146 | * Get the input black value and then set the corresponding color | |
147 | * channel values... | |
148 | */ | |
149 | ||
150 | k = *input++; | |
151 | output[0] = channels[0][k]; | |
152 | output[1] = channels[1][k]; | |
153 | output[2] = channels[2][k]; | |
154 | ||
155 | if (ink_limit) | |
156 | { | |
157 | ink = output[0] + output[1] + output[2]; | |
158 | ||
159 | if (ink > ink_limit) | |
160 | { | |
161 | output[0] = ink_limit * output[0] / ink; | |
162 | output[1] = ink_limit * output[1] / ink; | |
163 | output[2] = ink_limit * output[2] / ink; | |
164 | } | |
165 | } | |
166 | ||
167 | output += 3; | |
168 | num_pixels --; | |
169 | } | |
170 | break; | |
171 | ||
172 | case 4 : /* CMYK */ | |
173 | while (num_pixels > 0) | |
174 | { | |
175 | /* | |
176 | * Get the input black value and then set the corresponding color | |
177 | * channel values... | |
178 | */ | |
179 | ||
180 | k = *input++; | |
181 | *output++ = 0; | |
182 | *output++ = 0; | |
183 | *output++ = 0; | |
184 | *output++ = channels[3][k]; | |
185 | ||
186 | num_pixels --; | |
187 | } | |
188 | break; | |
189 | ||
190 | case 6 : /* CcMmYK */ | |
191 | while (num_pixels > 0) | |
192 | { | |
193 | /* | |
194 | * Get the input black value and then set the corresponding color | |
195 | * channel values... | |
196 | */ | |
197 | ||
198 | k = *input++; | |
199 | *output++ = 0; | |
200 | *output++ = 0; | |
201 | *output++ = 0; | |
202 | *output++ = 0; | |
203 | *output++ = 0; | |
204 | *output++ = channels[5][k]; | |
205 | ||
206 | num_pixels --; | |
207 | } | |
208 | break; | |
209 | ||
210 | case 7 : /* CcMmYKk */ | |
211 | while (num_pixels > 0) | |
212 | { | |
213 | /* | |
214 | * Get the input black value and then set the corresponding color | |
215 | * channel values... | |
216 | */ | |
217 | ||
218 | k = *input++; | |
219 | output[0] = 0; | |
220 | output[1] = 0; | |
221 | output[2] = 0; | |
222 | output[3] = 0; | |
223 | output[4] = 0; | |
224 | output[5] = channels[5][k]; | |
225 | output[6] = channels[6][k]; | |
226 | ||
227 | if (ink_limit) | |
228 | { | |
229 | ink = output[5] + output[6]; | |
230 | ||
231 | if (ink > ink_limit) | |
232 | { | |
233 | output[5] = ink_limit * output[5] / ink; | |
234 | output[6] = ink_limit * output[6] / ink; | |
235 | } | |
236 | } | |
237 | ||
238 | output += 7; | |
239 | num_pixels --; | |
240 | } | |
241 | break; | |
242 | } | |
243 | } | |
244 | ||
245 | ||
246 | /* | |
247 | * 'cupsCMYKDoCMYK()' - Do a CMYK separation... | |
248 | */ | |
249 | ||
250 | void | |
251 | cupsCMYKDoCMYK(const cups_cmyk_t *cmyk, | |
252 | /* I - Color separation */ | |
253 | const unsigned char *input, | |
254 | /* I - Input grayscale pixels */ | |
255 | short *output, | |
256 | /* O - Output Device-N pixels */ | |
257 | int num_pixels) | |
258 | /* I - Number of pixels */ | |
259 | { | |
260 | int c, /* Current cyan value */ | |
261 | m, /* Current magenta value */ | |
262 | y, /* Current yellow value */ | |
263 | k; /* Current black value */ | |
264 | const short **channels; /* Copy of channel LUTs */ | |
ac884b6a MS |
265 | int ink, /* Amount of ink */ |
266 | ink_limit; /* Ink limit from separation */ | |
267 | ||
268 | ||
269 | /* | |
270 | * Range check input... | |
271 | */ | |
272 | ||
273 | if (cmyk == NULL || input == NULL || output == NULL || num_pixels <= 0) | |
274 | return; | |
275 | ||
276 | /* | |
277 | * Loop through it all... | |
278 | */ | |
279 | ||
280 | channels = (const short **)cmyk->channels; | |
ac884b6a MS |
281 | ink_limit = cmyk->ink_limit; |
282 | ||
283 | switch (cmyk->num_channels) | |
284 | { | |
285 | case 1 : /* Black */ | |
286 | while (num_pixels > 0) | |
287 | { | |
288 | /* | |
289 | * Get the input black value and then set the corresponding color | |
290 | * channel values... | |
291 | */ | |
292 | ||
293 | c = *input++; | |
294 | m = *input++; | |
295 | y = *input++; | |
296 | k = *input++ + (c * 31 + m * 61 + y * 8) / 100; | |
297 | ||
298 | if (k < 255) | |
299 | *output++ = channels[0][k]; | |
300 | else | |
301 | *output++ = channels[0][255]; | |
302 | ||
303 | num_pixels --; | |
304 | } | |
305 | break; | |
306 | ||
307 | case 2 : /* Black, light black */ | |
308 | while (num_pixels > 0) | |
309 | { | |
310 | /* | |
311 | * Get the input black value and then set the corresponding color | |
312 | * channel values... | |
313 | */ | |
314 | ||
315 | c = *input++; | |
316 | m = *input++; | |
317 | y = *input++; | |
318 | k = *input++ + (c * 31 + m * 61 + y * 8) / 100; | |
319 | ||
320 | if (k < 255) | |
321 | { | |
322 | output[0] = channels[0][k]; | |
323 | output[1] = channels[1][k]; | |
324 | } | |
325 | else | |
326 | { | |
327 | output[0] = channels[0][255]; | |
328 | output[1] = channels[1][255]; | |
329 | } | |
330 | ||
331 | if (ink_limit) | |
332 | { | |
333 | ink = output[0] + output[1]; | |
334 | ||
335 | if (ink > ink_limit) | |
336 | { | |
337 | output[0] = ink_limit * output[0] / ink; | |
338 | output[1] = ink_limit * output[1] / ink; | |
339 | } | |
340 | } | |
341 | ||
342 | output += 2; | |
343 | num_pixels --; | |
344 | } | |
345 | break; | |
346 | ||
347 | case 3 : /* CMY */ | |
348 | while (num_pixels > 0) | |
349 | { | |
350 | /* | |
351 | * Get the input black value and then set the corresponding color | |
352 | * channel values... | |
353 | */ | |
354 | ||
355 | c = *input++; | |
356 | m = *input++; | |
357 | y = *input++; | |
358 | k = *input++; | |
359 | c += k; | |
360 | m += k; | |
361 | y += k; | |
362 | ||
363 | if (c < 255) | |
364 | output[0] = channels[0][c]; | |
365 | else | |
366 | output[0] = channels[0][255]; | |
367 | ||
368 | if (m < 255) | |
369 | output[1] = channels[1][m]; | |
370 | else | |
371 | output[1] = channels[1][255]; | |
372 | ||
373 | if (y < 255) | |
374 | output[2] = channels[2][y]; | |
375 | else | |
376 | output[2] = channels[2][255]; | |
377 | ||
378 | if (ink_limit) | |
379 | { | |
380 | ink = output[0] + output[1] + output[2]; | |
381 | ||
382 | if (ink > ink_limit) | |
383 | { | |
384 | output[0] = ink_limit * output[0] / ink; | |
385 | output[1] = ink_limit * output[1] / ink; | |
386 | output[2] = ink_limit * output[2] / ink; | |
387 | } | |
388 | } | |
389 | ||
390 | output += 3; | |
391 | num_pixels --; | |
392 | } | |
393 | break; | |
394 | ||
395 | case 4 : /* CMYK */ | |
396 | while (num_pixels > 0) | |
397 | { | |
398 | /* | |
399 | * Get the input black value and then set the corresponding color | |
400 | * channel values... | |
401 | */ | |
402 | ||
403 | c = *input++; | |
404 | m = *input++; | |
405 | y = *input++; | |
406 | k = *input++; | |
407 | ||
408 | output[0] = channels[0][c]; | |
409 | output[1] = channels[1][m]; | |
410 | output[2] = channels[2][y]; | |
411 | output[3] = channels[3][k]; | |
412 | ||
413 | if (ink_limit) | |
414 | { | |
415 | ink = output[0] + output[1] + output[2] + output[3]; | |
416 | ||
417 | if (ink > ink_limit) | |
418 | { | |
419 | output[0] = ink_limit * output[0] / ink; | |
420 | output[1] = ink_limit * output[1] / ink; | |
421 | output[2] = ink_limit * output[2] / ink; | |
422 | output[3] = ink_limit * output[3] / ink; | |
423 | } | |
424 | } | |
425 | ||
426 | output += 4; | |
427 | num_pixels --; | |
428 | } | |
429 | break; | |
430 | ||
431 | case 6 : /* CcMmYK */ | |
432 | while (num_pixels > 0) | |
433 | { | |
434 | /* | |
435 | * Get the input black value and then set the corresponding color | |
436 | * channel values... | |
437 | */ | |
438 | ||
439 | c = *input++; | |
440 | m = *input++; | |
441 | y = *input++; | |
442 | k = *input++; | |
443 | ||
444 | output[0] = channels[0][c]; | |
445 | output[1] = channels[1][c]; | |
446 | output[2] = channels[2][m]; | |
447 | output[3] = channels[3][m]; | |
448 | output[4] = channels[4][y]; | |
449 | output[5] = channels[5][k]; | |
450 | ||
451 | if (ink_limit) | |
452 | { | |
453 | ink = output[0] + output[1] + output[2] + output[3] + | |
454 | output[4] + output[5]; | |
455 | ||
456 | if (ink > ink_limit) | |
457 | { | |
458 | output[0] = ink_limit * output[0] / ink; | |
459 | output[1] = ink_limit * output[1] / ink; | |
460 | output[2] = ink_limit * output[2] / ink; | |
461 | output[3] = ink_limit * output[3] / ink; | |
462 | output[4] = ink_limit * output[4] / ink; | |
463 | output[5] = ink_limit * output[5] / ink; | |
464 | } | |
465 | } | |
466 | ||
467 | output += 6; | |
468 | num_pixels --; | |
469 | } | |
470 | break; | |
471 | ||
472 | case 7 : /* CcMmYKk */ | |
473 | while (num_pixels > 0) | |
474 | { | |
475 | /* | |
476 | * Get the input black value and then set the corresponding color | |
477 | * channel values... | |
478 | */ | |
479 | ||
480 | c = *input++; | |
481 | m = *input++; | |
482 | y = *input++; | |
483 | k = *input++; | |
484 | ||
485 | output[0] = channels[0][c]; | |
486 | output[1] = channels[1][c]; | |
487 | output[2] = channels[2][m]; | |
488 | output[3] = channels[3][m]; | |
489 | output[4] = channels[4][y]; | |
490 | output[5] = channels[5][k]; | |
491 | output[6] = channels[6][k]; | |
492 | ||
493 | if (ink_limit) | |
494 | { | |
495 | ink = output[0] + output[1] + output[2] + output[3] + | |
496 | output[4] + output[5] + output[6]; | |
497 | ||
498 | if (ink > ink_limit) | |
499 | { | |
500 | output[0] = ink_limit * output[0] / ink; | |
501 | output[1] = ink_limit * output[1] / ink; | |
502 | output[2] = ink_limit * output[2] / ink; | |
503 | output[3] = ink_limit * output[3] / ink; | |
504 | output[4] = ink_limit * output[4] / ink; | |
505 | output[5] = ink_limit * output[5] / ink; | |
506 | output[6] = ink_limit * output[6] / ink; | |
507 | } | |
508 | } | |
509 | ||
510 | output += 7; | |
511 | num_pixels --; | |
512 | } | |
513 | break; | |
514 | } | |
515 | } | |
516 | ||
517 | ||
518 | /* | |
519 | * 'cupsCMYKDoGray()' - Do a grayscale separation... | |
520 | */ | |
521 | ||
522 | void | |
523 | cupsCMYKDoGray(const cups_cmyk_t *cmyk, | |
524 | /* I - Color separation */ | |
525 | const unsigned char *input, | |
526 | /* I - Input grayscale pixels */ | |
527 | short *output, | |
528 | /* O - Output Device-N pixels */ | |
529 | int num_pixels) | |
530 | /* I - Number of pixels */ | |
531 | { | |
532 | int k, /* Current black value */ | |
533 | kc; /* Current black color value */ | |
534 | const short **channels; /* Copy of channel LUTs */ | |
ac884b6a MS |
535 | int ink, /* Amount of ink */ |
536 | ink_limit; /* Ink limit from separation */ | |
537 | ||
538 | ||
539 | /* | |
540 | * Range check input... | |
541 | */ | |
542 | ||
543 | if (cmyk == NULL || input == NULL || output == NULL || num_pixels <= 0) | |
544 | return; | |
545 | ||
546 | /* | |
547 | * Loop through it all... | |
548 | */ | |
549 | ||
550 | channels = (const short **)cmyk->channels; | |
ac884b6a MS |
551 | ink_limit = cmyk->ink_limit; |
552 | ||
553 | switch (cmyk->num_channels) | |
554 | { | |
555 | case 1 : /* Black */ | |
556 | while (num_pixels > 0) | |
557 | { | |
558 | /* | |
559 | * Get the input black value and then set the corresponding color | |
560 | * channel values... | |
561 | */ | |
562 | ||
563 | k = cups_scmy_lut[*input++]; | |
564 | *output++ = channels[0][k]; | |
565 | ||
566 | num_pixels --; | |
567 | } | |
568 | break; | |
569 | ||
570 | case 2 : /* Black, light black */ | |
571 | while (num_pixels > 0) | |
572 | { | |
573 | /* | |
574 | * Get the input black value and then set the corresponding color | |
575 | * channel values... | |
576 | */ | |
577 | ||
578 | k = cups_scmy_lut[*input++]; | |
579 | output[0] = channels[0][k]; | |
580 | output[1] = channels[1][k]; | |
581 | ||
582 | if (ink_limit) | |
583 | { | |
584 | ink = output[0] + output[1]; | |
585 | ||
586 | if (ink > ink_limit) | |
587 | { | |
588 | output[0] = ink_limit * output[0] / ink; | |
589 | output[1] = ink_limit * output[1] / ink; | |
590 | } | |
591 | } | |
592 | ||
593 | output += 2; | |
594 | num_pixels --; | |
595 | } | |
596 | break; | |
597 | ||
598 | case 3 : /* CMY */ | |
599 | while (num_pixels > 0) | |
600 | { | |
601 | /* | |
602 | * Get the input black value and then set the corresponding color | |
603 | * channel values... | |
604 | */ | |
605 | ||
606 | k = cups_scmy_lut[*input++]; | |
607 | output[0] = channels[0][k]; | |
608 | output[1] = channels[1][k]; | |
609 | output[2] = channels[2][k]; | |
610 | ||
611 | if (ink_limit) | |
612 | { | |
613 | ink = output[0] + output[1] + output[2]; | |
614 | ||
615 | if (ink > ink_limit) | |
616 | { | |
617 | output[0] = ink_limit * output[0] / ink; | |
618 | output[1] = ink_limit * output[1] / ink; | |
619 | output[2] = ink_limit * output[2] / ink; | |
620 | } | |
621 | } | |
622 | ||
623 | output += 3; | |
624 | num_pixels --; | |
625 | } | |
626 | break; | |
627 | ||
628 | case 4 : /* CMYK */ | |
629 | while (num_pixels > 0) | |
630 | { | |
631 | /* | |
632 | * Get the input black value and then set the corresponding color | |
633 | * channel values... | |
634 | */ | |
635 | ||
636 | k = cups_scmy_lut[*input++]; | |
637 | kc = cmyk->color_lut[k]; | |
638 | k = cmyk->black_lut[k]; | |
639 | output[0] = channels[0][kc]; | |
640 | output[1] = channels[1][kc]; | |
641 | output[2] = channels[2][kc]; | |
642 | output[3] = channels[3][k]; | |
643 | ||
644 | if (ink_limit) | |
645 | { | |
646 | ink = output[0] + output[1] + output[2] + output[3]; | |
647 | ||
648 | if (ink > ink_limit) | |
649 | { | |
650 | output[0] = ink_limit * output[0] / ink; | |
651 | output[1] = ink_limit * output[1] / ink; | |
652 | output[2] = ink_limit * output[2] / ink; | |
653 | output[3] = ink_limit * output[3] / ink; | |
654 | } | |
655 | } | |
656 | ||
657 | output += 4; | |
658 | num_pixels --; | |
659 | } | |
660 | break; | |
661 | ||
662 | case 6 : /* CcMmYK */ | |
663 | while (num_pixels > 0) | |
664 | { | |
665 | /* | |
666 | * Get the input black value and then set the corresponding color | |
667 | * channel values... | |
668 | */ | |
669 | ||
670 | k = cups_scmy_lut[*input++]; | |
671 | kc = cmyk->color_lut[k]; | |
672 | k = cmyk->black_lut[k]; | |
673 | output[0] = channels[0][kc]; | |
674 | output[1] = channels[1][kc]; | |
675 | output[2] = channels[2][kc]; | |
676 | output[3] = channels[3][kc]; | |
677 | output[4] = channels[4][kc]; | |
678 | output[5] = channels[5][k]; | |
679 | ||
680 | if (ink_limit) | |
681 | { | |
682 | ink = output[0] + output[1] + output[2] + output[3] + | |
683 | output[4] + output[5]; | |
684 | ||
685 | if (ink > ink_limit) | |
686 | { | |
687 | output[0] = ink_limit * output[0] / ink; | |
688 | output[1] = ink_limit * output[1] / ink; | |
689 | output[2] = ink_limit * output[2] / ink; | |
690 | output[3] = ink_limit * output[3] / ink; | |
691 | output[4] = ink_limit * output[4] / ink; | |
692 | output[5] = ink_limit * output[5] / ink; | |
693 | } | |
694 | } | |
695 | ||
696 | output += 6; | |
697 | num_pixels --; | |
698 | } | |
699 | break; | |
700 | ||
701 | case 7 : /* CcMmYKk */ | |
702 | while (num_pixels > 0) | |
703 | { | |
704 | /* | |
705 | * Get the input black value and then set the corresponding color | |
706 | * channel values... | |
707 | */ | |
708 | ||
709 | k = cups_scmy_lut[*input++]; | |
710 | kc = cmyk->color_lut[k]; | |
711 | k = cmyk->black_lut[k]; | |
712 | output[0] = channels[0][kc]; | |
713 | output[1] = channels[1][kc]; | |
714 | output[2] = channels[2][kc]; | |
715 | output[3] = channels[3][kc]; | |
716 | output[4] = channels[4][kc]; | |
717 | output[5] = channels[5][k]; | |
718 | output[6] = channels[6][k]; | |
719 | ||
720 | if (ink_limit) | |
721 | { | |
722 | ink = output[0] + output[1] + output[2] + output[3] + | |
723 | output[4] + output[5] + output[6]; | |
724 | ||
725 | if (ink > ink_limit) | |
726 | { | |
727 | output[0] = ink_limit * output[0] / ink; | |
728 | output[1] = ink_limit * output[1] / ink; | |
729 | output[2] = ink_limit * output[2] / ink; | |
730 | output[3] = ink_limit * output[3] / ink; | |
731 | output[4] = ink_limit * output[4] / ink; | |
732 | output[5] = ink_limit * output[5] / ink; | |
733 | output[6] = ink_limit * output[6] / ink; | |
734 | } | |
735 | } | |
736 | ||
737 | output += 7; | |
738 | num_pixels --; | |
739 | } | |
740 | break; | |
741 | } | |
742 | } | |
743 | ||
744 | ||
745 | /* | |
746 | * 'cupsCMYKDoRGB()' - Do an sRGB separation... | |
747 | */ | |
748 | ||
749 | void | |
750 | cupsCMYKDoRGB(const cups_cmyk_t *cmyk, | |
751 | /* I - Color separation */ | |
752 | const unsigned char *input, | |
753 | /* I - Input grayscale pixels */ | |
754 | short *output, | |
755 | /* O - Output Device-N pixels */ | |
756 | int num_pixels) | |
757 | /* I - Number of pixels */ | |
758 | { | |
759 | int c, /* Current cyan value */ | |
760 | m, /* Current magenta value */ | |
761 | y, /* Current yellow value */ | |
762 | k, /* Current black value */ | |
763 | kc, /* Current black color value */ | |
764 | km; /* Maximum black value */ | |
765 | const short **channels; /* Copy of channel LUTs */ | |
ac884b6a MS |
766 | int ink, /* Amount of ink */ |
767 | ink_limit; /* Ink limit from separation */ | |
768 | ||
769 | ||
770 | /* | |
771 | * Range check input... | |
772 | */ | |
773 | ||
774 | if (cmyk == NULL || input == NULL || output == NULL || num_pixels <= 0) | |
775 | return; | |
776 | ||
777 | /* | |
778 | * Loop through it all... | |
779 | */ | |
780 | ||
781 | channels = (const short **)cmyk->channels; | |
ac884b6a MS |
782 | ink_limit = cmyk->ink_limit; |
783 | ||
784 | switch (cmyk->num_channels) | |
785 | { | |
786 | case 1 : /* Black */ | |
787 | while (num_pixels > 0) | |
788 | { | |
789 | /* | |
790 | * Get the input black value and then set the corresponding color | |
791 | * channel values... | |
792 | */ | |
793 | ||
794 | c = cups_scmy_lut[*input++]; | |
795 | m = cups_scmy_lut[*input++]; | |
796 | y = cups_scmy_lut[*input++]; | |
797 | k = (c * 31 + m * 61 + y * 8) / 100; | |
798 | ||
799 | *output++ = channels[0][k]; | |
800 | ||
801 | num_pixels --; | |
802 | } | |
803 | break; | |
804 | ||
805 | case 2 : /* Black, light black */ | |
806 | while (num_pixels > 0) | |
807 | { | |
808 | /* | |
809 | * Get the input black value and then set the corresponding color | |
810 | * channel values... | |
811 | */ | |
812 | ||
813 | c = cups_scmy_lut[*input++]; | |
814 | m = cups_scmy_lut[*input++]; | |
815 | y = cups_scmy_lut[*input++]; | |
816 | k = (c * 31 + m * 61 + y * 8) / 100; | |
817 | ||
818 | output[0] = channels[0][k]; | |
819 | output[1] = channels[1][k]; | |
820 | ||
821 | if (ink_limit) | |
822 | { | |
823 | ink = output[0] + output[1]; | |
824 | ||
825 | if (ink > ink_limit) | |
826 | { | |
827 | output[0] = ink_limit * output[0] / ink; | |
828 | output[1] = ink_limit * output[1] / ink; | |
829 | } | |
830 | } | |
831 | ||
832 | output += 2; | |
833 | num_pixels --; | |
834 | } | |
835 | break; | |
836 | ||
837 | case 3 : /* CMY */ | |
838 | while (num_pixels > 0) | |
839 | { | |
840 | /* | |
841 | * Get the input black value and then set the corresponding color | |
842 | * channel values... | |
843 | */ | |
844 | ||
845 | c = cups_scmy_lut[*input++]; | |
846 | m = cups_scmy_lut[*input++]; | |
847 | y = cups_scmy_lut[*input++]; | |
848 | ||
849 | output[0] = channels[0][c]; | |
850 | output[1] = channels[1][m]; | |
851 | output[2] = channels[2][y]; | |
852 | ||
853 | if (ink_limit) | |
854 | { | |
855 | ink = output[0] + output[1] + output[2]; | |
856 | ||
857 | if (ink > ink_limit) | |
858 | { | |
859 | output[0] = ink_limit * output[0] / ink; | |
860 | output[1] = ink_limit * output[1] / ink; | |
861 | output[2] = ink_limit * output[2] / ink; | |
862 | } | |
863 | } | |
864 | ||
865 | output += 3; | |
866 | num_pixels --; | |
867 | } | |
868 | break; | |
869 | ||
870 | case 4 : /* CMYK */ | |
871 | while (num_pixels > 0) | |
872 | { | |
873 | /* | |
874 | * Get the input black value and then set the corresponding color | |
875 | * channel values... | |
876 | */ | |
877 | ||
878 | c = cups_scmy_lut[*input++]; | |
879 | m = cups_scmy_lut[*input++]; | |
880 | y = cups_scmy_lut[*input++]; | |
881 | k = min(c, min(m, y)); | |
882 | ||
883 | if ((km = max(c, max(m, y))) > k) | |
884 | k = k * k * k / (km * km); | |
885 | ||
886 | kc = cmyk->color_lut[k] - k; | |
887 | k = cmyk->black_lut[k]; | |
888 | c += kc; | |
889 | m += kc; | |
890 | y += kc; | |
891 | ||
892 | output[0] = channels[0][c]; | |
893 | output[1] = channels[1][m]; | |
894 | output[2] = channels[2][y]; | |
895 | output[3] = channels[3][k]; | |
896 | ||
897 | if (ink_limit) | |
898 | { | |
899 | ink = output[0] + output[1] + output[2] + output[3]; | |
900 | ||
901 | if (ink > ink_limit) | |
902 | { | |
903 | output[0] = ink_limit * output[0] / ink; | |
904 | output[1] = ink_limit * output[1] / ink; | |
905 | output[2] = ink_limit * output[2] / ink; | |
906 | output[3] = ink_limit * output[3] / ink; | |
907 | } | |
908 | } | |
909 | ||
910 | output += 4; | |
911 | num_pixels --; | |
912 | } | |
913 | break; | |
914 | ||
915 | case 6 : /* CcMmYK */ | |
916 | while (num_pixels > 0) | |
917 | { | |
918 | /* | |
919 | * Get the input black value and then set the corresponding color | |
920 | * channel values... | |
921 | */ | |
922 | ||
923 | c = cups_scmy_lut[*input++]; | |
924 | m = cups_scmy_lut[*input++]; | |
925 | y = cups_scmy_lut[*input++]; | |
926 | k = min(c, min(m, y)); | |
927 | ||
928 | if ((km = max(c, max(m, y))) > k) | |
929 | k = k * k * k / (km * km); | |
930 | ||
931 | kc = cmyk->color_lut[k] - k; | |
932 | k = cmyk->black_lut[k]; | |
933 | c += kc; | |
934 | m += kc; | |
935 | y += kc; | |
936 | ||
937 | output[0] = channels[0][c]; | |
938 | output[1] = channels[1][c]; | |
939 | output[2] = channels[2][m]; | |
940 | output[3] = channels[3][m]; | |
941 | output[4] = channels[4][y]; | |
942 | output[5] = channels[5][k]; | |
943 | ||
944 | if (ink_limit) | |
945 | { | |
946 | ink = output[0] + output[1] + output[2] + output[3] + | |
947 | output[4] + output[5]; | |
948 | ||
949 | if (ink > ink_limit) | |
950 | { | |
951 | output[0] = ink_limit * output[0] / ink; | |
952 | output[1] = ink_limit * output[1] / ink; | |
953 | output[2] = ink_limit * output[2] / ink; | |
954 | output[3] = ink_limit * output[3] / ink; | |
955 | output[4] = ink_limit * output[4] / ink; | |
956 | output[5] = ink_limit * output[5] / ink; | |
957 | } | |
958 | } | |
959 | ||
960 | output += 6; | |
961 | num_pixels --; | |
962 | } | |
963 | break; | |
964 | ||
965 | case 7 : /* CcMmYKk */ | |
966 | while (num_pixels > 0) | |
967 | { | |
968 | /* | |
969 | * Get the input black value and then set the corresponding color | |
970 | * channel values... | |
971 | */ | |
972 | ||
973 | c = cups_scmy_lut[*input++]; | |
974 | m = cups_scmy_lut[*input++]; | |
975 | y = cups_scmy_lut[*input++]; | |
976 | k = min(c, min(m, y)); | |
977 | ||
978 | if ((km = max(c, max(m, y))) > k) | |
979 | k = k * k * k / (km * km); | |
980 | ||
981 | kc = cmyk->color_lut[k] - k; | |
982 | k = cmyk->black_lut[k]; | |
983 | c += kc; | |
984 | m += kc; | |
985 | y += kc; | |
986 | ||
987 | output[0] = channels[0][c]; | |
988 | output[1] = channels[1][c]; | |
989 | output[2] = channels[2][m]; | |
990 | output[3] = channels[3][m]; | |
991 | output[4] = channels[4][y]; | |
992 | output[5] = channels[5][k]; | |
993 | output[6] = channels[6][k]; | |
994 | ||
995 | if (ink_limit) | |
996 | { | |
997 | ink = output[0] + output[1] + output[2] + output[3] + | |
998 | output[4] + output[5] + output[6]; | |
999 | ||
1000 | if (ink > ink_limit) | |
1001 | { | |
1002 | output[0] = ink_limit * output[0] / ink; | |
1003 | output[1] = ink_limit * output[1] / ink; | |
1004 | output[2] = ink_limit * output[2] / ink; | |
1005 | output[3] = ink_limit * output[3] / ink; | |
1006 | output[4] = ink_limit * output[4] / ink; | |
1007 | output[5] = ink_limit * output[5] / ink; | |
1008 | output[6] = ink_limit * output[6] / ink; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | output += 7; | |
1013 | num_pixels --; | |
1014 | } | |
1015 | break; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | ||
1020 | /* | |
1021 | * 'cupsCMYKLoad()' - Load a CMYK color profile from PPD attributes. | |
1022 | */ | |
1023 | ||
1024 | cups_cmyk_t * /* O - CMYK color separation */ | |
1025 | cupsCMYKLoad(ppd_file_t *ppd, /* I - PPD file */ | |
1026 | const char *colormodel, /* I - ColorModel value */ | |
1027 | const char *media, /* I - MediaType value */ | |
1028 | const char *resolution) /* I - Resolution value */ | |
1029 | { | |
1030 | cups_cmyk_t *cmyk; /* CMYK color separation */ | |
1031 | char spec[PPD_MAX_NAME]; /* Profile name */ | |
1032 | ppd_attr_t *attr; /* Attribute from PPD file */ | |
1033 | int num_channels; /* Number of color components */ | |
1034 | float gamval, /* Gamma correction value */ | |
1035 | density, /* Density value */ | |
1036 | light, /* Light ink limit */ | |
1037 | dark, /* Light ink cut-off */ | |
1038 | lower, /* Start of black ink */ | |
1039 | upper; /* End of color ink */ | |
1040 | int num_xypoints; /* Number of X,Y points */ | |
1041 | float xypoints[100 * 2], /* X,Y points */ | |
1042 | *xyptr; /* Current X,Y point */ | |
1043 | ||
1044 | ||
1045 | /* | |
1046 | * Range check input... | |
1047 | */ | |
1048 | ||
1049 | if (ppd == NULL || colormodel == NULL || resolution == NULL || media == NULL) | |
1050 | return (NULL); | |
1051 | ||
1052 | /* | |
1053 | * Find the following attributes: | |
1054 | * | |
1055 | * cupsAllGamma - Set default curve using gamma + density | |
1056 | * cupsAllXY - Set default curve using XY points | |
1057 | * cupsBlackGamma - Set black curve using gamma + density | |
1058 | * cupsBlackGeneration - Set black generation | |
1059 | * cupsBlackLightDark - Set black light/dark transition | |
1060 | * cupsBlackXY - Set black curve using XY points | |
1061 | * cupsCyanGamma - Set cyan curve using gamma + density | |
1062 | * cupsCyanLightDark - Set cyan light/dark transition | |
1063 | * cupsCyanXY - Set cyan curve using XY points | |
1064 | * cupsInkChannels - Set number of color channels | |
1065 | * cupsInkLimit - Set total ink limit | |
1066 | * cupsLightBlackGamma - Set light black curve using gamma + density | |
1067 | * cupsLightBlackXY - Set light black curve using XY points | |
1068 | * cupsLightCyanGamma - Set light cyan curve using gamma + density | |
1069 | * cupsLightCyanXY - Set light cyan curve using XY points | |
1070 | * cupsLightMagentaGamma - Set light magenta curve using gamma + density | |
1071 | * cupsLightMagentaXY - Set light magenta curve using XY points | |
1072 | * cupsMagentaGamma - Set magenta curve using gamma + density | |
1073 | * cupsMagentaLightDark - Set magenta light/dark transition | |
1074 | * cupsMagentaXY - Set magenta curve using XY points | |
1075 | * cupsYellowGamma - Set yellow curve using gamma + density | |
1076 | * cupsYellowXY - Set yellow curve using XY points | |
1077 | * | |
1078 | * The only required attribute is cupsInkChannels. | |
1079 | * | |
1080 | * The *XY attributes have precedence over the *Gamma attributes, and | |
1081 | * the *Light* attributes have precedence over the corresponding | |
1082 | * *LightDark* attributes. | |
1083 | */ | |
1084 | ||
1085 | /* | |
1086 | * Get the required cupsInkChannels attribute... | |
1087 | */ | |
1088 | ||
1089 | if ((attr = cupsFindAttr(ppd, "cupsInkChannels", colormodel, media, | |
1090 | resolution, spec, sizeof(spec))) == NULL) | |
1091 | return (NULL); | |
1092 | ||
1093 | num_channels = atoi(attr->value); | |
1094 | ||
1095 | if (num_channels < 1 || num_channels > 7 || num_channels == 5) | |
1096 | return (NULL); | |
1097 | ||
1098 | if ((cmyk = cupsCMYKNew(num_channels)) == NULL) | |
1099 | return (NULL); | |
1100 | ||
1101 | /* | |
1102 | * Get the optional cupsInkLimit attribute... | |
1103 | */ | |
1104 | ||
1105 | if ((attr = cupsFindAttr(ppd, "cupsInkLimit", colormodel, media, | |
1106 | resolution, spec, sizeof(spec))) != NULL) | |
1107 | cupsCMYKSetInkLimit(cmyk, atof(attr->value)); | |
1108 | ||
1109 | /* | |
1110 | * Get the optional cupsBlackGeneration attribute... | |
1111 | */ | |
1112 | ||
1113 | if ((attr = cupsFindAttr(ppd, "cupsBlackGeneration", colormodel, media, | |
1114 | resolution, spec, sizeof(spec))) != NULL) | |
1115 | { | |
1116 | if (sscanf(attr->value, "%f%f", &lower, &upper) == 2) | |
1117 | cupsCMYKSetBlack(cmyk, lower, upper); | |
1118 | } | |
1119 | ||
1120 | /* | |
1121 | * Get the optional cupsBlackXY or cupsBlackGamma attributes... | |
1122 | */ | |
1123 | ||
1124 | if (num_channels != 3) | |
1125 | { | |
1126 | if ((attr = cupsFindAttr(ppd, "cupsBlackXY", colormodel, media, | |
1127 | resolution, spec, sizeof(spec))) != NULL) | |
1128 | { | |
1129 | for (num_xypoints = 0, xyptr = xypoints; | |
1130 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1131 | attr = ppdFindNextAttr(ppd, "cupsBlackXY", spec)) | |
1132 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1133 | { | |
1134 | num_xypoints ++; | |
1135 | xyptr += 2; | |
1136 | } | |
1137 | ||
1138 | switch (num_channels) | |
1139 | { | |
1140 | case 1 : | |
1141 | case 2 : | |
1142 | cupsCMYKSetCurve(cmyk, 0, num_xypoints, xypoints); | |
1143 | break; | |
1144 | case 4 : | |
1145 | cupsCMYKSetCurve(cmyk, 3, num_xypoints, xypoints); | |
1146 | break; | |
1147 | case 6 : | |
1148 | case 7 : | |
1149 | cupsCMYKSetCurve(cmyk, 5, num_xypoints, xypoints); | |
1150 | break; | |
1151 | } | |
1152 | } | |
1153 | else if ((attr = cupsFindAttr(ppd, "cupsBlackGamma", colormodel, | |
1154 | media, resolution, spec, | |
1155 | sizeof(spec))) != NULL) | |
1156 | { | |
1157 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1158 | switch (num_channels) | |
1159 | { | |
1160 | case 1 : | |
1161 | case 2 : | |
1162 | cupsCMYKSetGamma(cmyk, 0, gamval, density); | |
1163 | break; | |
1164 | case 4 : | |
1165 | cupsCMYKSetGamma(cmyk, 3, gamval, density); | |
1166 | break; | |
1167 | case 6 : | |
1168 | case 7 : | |
1169 | cupsCMYKSetGamma(cmyk, 5, gamval, density); | |
1170 | break; | |
1171 | } | |
1172 | } | |
1173 | else if ((attr = cupsFindAttr(ppd, "cupsAllXY", colormodel, media, | |
1174 | resolution, spec, sizeof(spec))) != NULL) | |
1175 | { | |
1176 | for (num_xypoints = 0, xyptr = xypoints; | |
1177 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1178 | attr = ppdFindNextAttr(ppd, "cupsAllXY", spec)) | |
1179 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1180 | { | |
1181 | num_xypoints ++; | |
1182 | xyptr += 2; | |
1183 | } | |
1184 | ||
1185 | switch (num_channels) | |
1186 | { | |
1187 | case 1 : | |
1188 | case 2 : | |
1189 | cupsCMYKSetCurve(cmyk, 0, num_xypoints, xypoints); | |
1190 | break; | |
1191 | case 4 : | |
1192 | cupsCMYKSetCurve(cmyk, 3, num_xypoints, xypoints); | |
1193 | break; | |
1194 | case 6 : | |
1195 | case 7 : | |
1196 | cupsCMYKSetCurve(cmyk, 5, num_xypoints, xypoints); | |
1197 | break; | |
1198 | } | |
1199 | } | |
1200 | else if ((attr = cupsFindAttr(ppd, "cupsAllGamma", colormodel, | |
1201 | media, resolution, spec, | |
1202 | sizeof(spec))) != NULL && | |
1203 | num_channels != 3) | |
1204 | { | |
1205 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1206 | switch (num_channels) | |
1207 | { | |
1208 | case 1 : | |
1209 | case 2 : | |
1210 | cupsCMYKSetGamma(cmyk, 0, gamval, density); | |
1211 | break; | |
1212 | case 4 : | |
1213 | cupsCMYKSetGamma(cmyk, 3, gamval, density); | |
1214 | break; | |
1215 | case 6 : | |
1216 | case 7 : | |
1217 | cupsCMYKSetGamma(cmyk, 5, gamval, density); | |
1218 | break; | |
1219 | } | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | if (num_channels > 2) | |
1224 | { | |
1225 | /* | |
1226 | * Get the optional cupsCyanXY or cupsCyanGamma attributes... | |
1227 | */ | |
1228 | ||
1229 | if ((attr = cupsFindAttr(ppd, "cupsCyanXY", colormodel, media, | |
1230 | resolution, spec, sizeof(spec))) != NULL) | |
1231 | { | |
1232 | for (num_xypoints = 0, xyptr = xypoints; | |
1233 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1234 | attr = ppdFindNextAttr(ppd, "cupsCyanXY", spec)) | |
1235 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1236 | { | |
1237 | num_xypoints ++; | |
1238 | xyptr += 2; | |
1239 | } | |
1240 | ||
1241 | cupsCMYKSetCurve(cmyk, 0, num_xypoints, xypoints); | |
1242 | } | |
1243 | else if ((attr = cupsFindAttr(ppd, "cupsCyanGamma", colormodel, media, | |
1244 | resolution, spec, sizeof(spec))) != NULL) | |
1245 | { | |
1246 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1247 | cupsCMYKSetGamma(cmyk, 0, gamval, density); | |
1248 | } | |
1249 | else if ((attr = cupsFindAttr(ppd, "cupsAllXY", colormodel, media, | |
1250 | resolution, spec, sizeof(spec))) != NULL) | |
1251 | { | |
1252 | for (num_xypoints = 0, xyptr = xypoints; | |
1253 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1254 | attr = ppdFindNextAttr(ppd, "cupsAllXY", spec)) | |
1255 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1256 | { | |
1257 | num_xypoints ++; | |
1258 | xyptr += 2; | |
1259 | } | |
1260 | ||
1261 | cupsCMYKSetCurve(cmyk, 0, num_xypoints, xypoints); | |
1262 | } | |
1263 | else if ((attr = cupsFindAttr(ppd, "cupsAllGamma", colormodel, media, | |
1264 | resolution, spec, sizeof(spec))) != NULL) | |
1265 | { | |
1266 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1267 | cupsCMYKSetGamma(cmyk, 0, gamval, density); | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Get the optional cupsMagentaXY or cupsMagentaGamma attributes... | |
1272 | */ | |
1273 | ||
1274 | if ((attr = cupsFindAttr(ppd, "cupsMagentaXY", colormodel, media, | |
1275 | resolution, spec, sizeof(spec))) != NULL) | |
1276 | { | |
1277 | for (num_xypoints = 0, xyptr = xypoints; | |
1278 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1279 | attr = ppdFindNextAttr(ppd, "cupsMagentaXY", spec)) | |
1280 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1281 | { | |
1282 | num_xypoints ++; | |
1283 | xyptr += 2; | |
1284 | } | |
1285 | ||
1286 | switch (num_channels) | |
1287 | { | |
1288 | case 3 : | |
1289 | case 4 : | |
1290 | cupsCMYKSetCurve(cmyk, 1, num_xypoints, xypoints); | |
1291 | break; | |
1292 | case 6 : | |
1293 | case 7 : | |
1294 | cupsCMYKSetCurve(cmyk, 2, num_xypoints, xypoints); | |
1295 | break; | |
1296 | } | |
1297 | } | |
1298 | else if ((attr = cupsFindAttr(ppd, "cupsMagentaGamma", colormodel, media, | |
1299 | resolution, spec, sizeof(spec))) != NULL) | |
1300 | { | |
1301 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1302 | switch (num_channels) | |
1303 | { | |
1304 | case 3 : | |
1305 | case 4 : | |
1306 | cupsCMYKSetGamma(cmyk, 1, gamval, density); | |
1307 | break; | |
1308 | case 6 : | |
1309 | case 7 : | |
1310 | cupsCMYKSetGamma(cmyk, 2, gamval, density); | |
1311 | break; | |
1312 | } | |
1313 | } | |
1314 | else if ((attr = cupsFindAttr(ppd, "cupsAllXY", colormodel, media, | |
1315 | resolution, spec, sizeof(spec))) != NULL) | |
1316 | { | |
1317 | for (num_xypoints = 0, xyptr = xypoints; | |
1318 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1319 | attr = ppdFindNextAttr(ppd, "cupsAllXY", spec)) | |
1320 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1321 | { | |
1322 | num_xypoints ++; | |
1323 | xyptr += 2; | |
1324 | } | |
1325 | ||
1326 | switch (num_channels) | |
1327 | { | |
1328 | case 3 : | |
1329 | case 4 : | |
1330 | cupsCMYKSetCurve(cmyk, 1, num_xypoints, xypoints); | |
1331 | break; | |
1332 | case 6 : | |
1333 | case 7 : | |
1334 | cupsCMYKSetCurve(cmyk, 2, num_xypoints, xypoints); | |
1335 | break; | |
1336 | } | |
1337 | } | |
1338 | else if ((attr = cupsFindAttr(ppd, "cupsAllGamma", colormodel, media, | |
1339 | resolution, spec, sizeof(spec))) != NULL) | |
1340 | { | |
1341 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1342 | switch (num_channels) | |
1343 | { | |
1344 | case 3 : | |
1345 | case 4 : | |
1346 | cupsCMYKSetGamma(cmyk, 1, gamval, density); | |
1347 | break; | |
1348 | case 6 : | |
1349 | case 7 : | |
1350 | cupsCMYKSetGamma(cmyk, 2, gamval, density); | |
1351 | break; | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * Get the optional cupsYellowXY or cupsYellowGamma attributes... | |
1357 | */ | |
1358 | ||
1359 | if ((attr = cupsFindAttr(ppd, "cupsYellowXY", colormodel, media, | |
1360 | resolution, spec, sizeof(spec))) != NULL) | |
1361 | { | |
1362 | for (num_xypoints = 0, xyptr = xypoints; | |
1363 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1364 | attr = ppdFindNextAttr(ppd, "cupsYellowXY", spec)) | |
1365 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1366 | { | |
1367 | num_xypoints ++; | |
1368 | xyptr += 2; | |
1369 | } | |
1370 | ||
1371 | switch (num_channels) | |
1372 | { | |
1373 | case 3 : | |
1374 | case 4 : | |
1375 | cupsCMYKSetCurve(cmyk, 2, num_xypoints, xypoints); | |
1376 | break; | |
1377 | case 6 : | |
1378 | case 7 : | |
1379 | cupsCMYKSetCurve(cmyk, 4, num_xypoints, xypoints); | |
1380 | break; | |
1381 | } | |
1382 | } | |
1383 | else if ((attr = cupsFindAttr(ppd, "cupsYellowGamma", colormodel, media, | |
1384 | resolution, spec, sizeof(spec))) != NULL) | |
1385 | { | |
1386 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1387 | switch (num_channels) | |
1388 | { | |
1389 | case 3 : | |
1390 | case 4 : | |
1391 | cupsCMYKSetGamma(cmyk, 2, gamval, density); | |
1392 | break; | |
1393 | case 6 : | |
1394 | case 7 : | |
1395 | cupsCMYKSetGamma(cmyk, 4, gamval, density); | |
1396 | break; | |
1397 | } | |
1398 | } | |
1399 | else if ((attr = cupsFindAttr(ppd, "cupsAllXY", colormodel, media, | |
1400 | resolution, spec, sizeof(spec))) != NULL) | |
1401 | { | |
1402 | for (num_xypoints = 0, xyptr = xypoints; | |
1403 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1404 | attr = ppdFindNextAttr(ppd, "cupsAllXY", spec)) | |
1405 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1406 | { | |
1407 | num_xypoints ++; | |
1408 | xyptr += 2; | |
1409 | } | |
1410 | ||
1411 | switch (num_channels) | |
1412 | { | |
1413 | case 3 : | |
1414 | case 4 : | |
1415 | cupsCMYKSetCurve(cmyk, 2, num_xypoints, xypoints); | |
1416 | break; | |
1417 | case 6 : | |
1418 | case 7 : | |
1419 | cupsCMYKSetCurve(cmyk, 4, num_xypoints, xypoints); | |
1420 | break; | |
1421 | } | |
1422 | } | |
1423 | else if ((attr = cupsFindAttr(ppd, "cupsAllGamma", colormodel, media, | |
1424 | resolution, spec, sizeof(spec))) != NULL) | |
1425 | { | |
1426 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1427 | switch (num_channels) | |
1428 | { | |
1429 | case 3 : | |
1430 | case 4 : | |
1431 | cupsCMYKSetGamma(cmyk, 2, gamval, density); | |
1432 | break; | |
1433 | case 6 : | |
1434 | case 7 : | |
1435 | cupsCMYKSetGamma(cmyk, 4, gamval, density); | |
1436 | break; | |
1437 | } | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * Get the optional cupsLightBlackXY, cupsLightBlackGamma, or | |
1443 | * cupsBlackLtDk attributes... | |
1444 | */ | |
1445 | ||
1446 | if (num_channels == 2 || num_channels == 7) | |
1447 | { | |
1448 | if ((attr = cupsFindAttr(ppd, "cupsLightBlackXY", colormodel, media, | |
1449 | resolution, spec, sizeof(spec))) != NULL) | |
1450 | { | |
1451 | for (num_xypoints = 0, xyptr = xypoints; | |
1452 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1453 | attr = ppdFindNextAttr(ppd, "cupsLightBlackXY", spec)) | |
1454 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1455 | { | |
1456 | num_xypoints ++; | |
1457 | xyptr += 2; | |
1458 | } | |
1459 | ||
1460 | switch (num_channels) | |
1461 | { | |
1462 | case 2 : | |
1463 | cupsCMYKSetCurve(cmyk, 1, num_xypoints, xypoints); | |
1464 | break; | |
1465 | case 7 : | |
1466 | cupsCMYKSetCurve(cmyk, 6, num_xypoints, xypoints); | |
1467 | break; | |
1468 | } | |
1469 | } | |
1470 | else if ((attr = cupsFindAttr(ppd, "cupsLightBlackGamma", colormodel, | |
1471 | media, resolution, spec, | |
1472 | sizeof(spec))) != NULL) | |
1473 | { | |
1474 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1475 | switch (num_channels) | |
1476 | { | |
1477 | case 2 : | |
1478 | cupsCMYKSetGamma(cmyk, 1, gamval, density); | |
1479 | break; | |
1480 | case 7 : | |
1481 | cupsCMYKSetGamma(cmyk, 6, gamval, density); | |
1482 | break; | |
1483 | } | |
1484 | } | |
1485 | else if ((attr = cupsFindAttr(ppd, "cupsBlackLtDk", colormodel, media, | |
1486 | resolution, spec, sizeof(spec))) != NULL) | |
1487 | { | |
1488 | if (sscanf(attr->value, "%f%f", &light, &dark) == 2) | |
1489 | switch (num_channels) | |
1490 | { | |
1491 | case 2 : | |
1492 | cupsCMYKSetLtDk(cmyk, 0, light, dark); | |
1493 | break; | |
1494 | case 7 : | |
1495 | cupsCMYKSetLtDk(cmyk, 5, light, dark); | |
1496 | break; | |
1497 | } | |
1498 | else | |
1499 | fprintf(stderr, "ERROR: Bad cupsBlackLtDk value \"%s\"!\n", | |
1500 | attr->value); | |
1501 | } | |
1502 | else | |
1503 | fprintf(stderr, "WARNING: No light black attribute found for %s!\n", | |
1504 | spec); | |
1505 | } | |
1506 | ||
1507 | if (num_channels >= 6) | |
1508 | { | |
1509 | /* | |
1510 | * Get the optional cupsLightCyanXY, cupsLightCyanGamma, or | |
1511 | * cupsCyanLtDk attributes... | |
1512 | */ | |
1513 | ||
1514 | if ((attr = cupsFindAttr(ppd, "cupsLightCyanXY", colormodel, media, | |
1515 | resolution, spec, sizeof(spec))) != NULL) | |
1516 | { | |
1517 | for (num_xypoints = 0, xyptr = xypoints; | |
1518 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1519 | attr = ppdFindNextAttr(ppd, "cupsLightCyanXY", spec)) | |
1520 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1521 | { | |
1522 | num_xypoints ++; | |
1523 | xyptr += 2; | |
1524 | } | |
1525 | ||
1526 | cupsCMYKSetCurve(cmyk, 1, num_xypoints, xypoints); | |
1527 | } | |
1528 | else if ((attr = cupsFindAttr(ppd, "cupsLightCyanGamma", colormodel, | |
1529 | media, resolution, spec, | |
1530 | sizeof(spec))) != NULL) | |
1531 | { | |
1532 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1533 | cupsCMYKSetGamma(cmyk, 1, gamval, density); | |
1534 | } | |
1535 | else if ((attr = cupsFindAttr(ppd, "cupsCyanLtDk", colormodel, media, | |
1536 | resolution, spec, sizeof(spec))) != NULL) | |
1537 | { | |
1538 | if (sscanf(attr->value, "%f%f", &light, &dark) == 2) | |
1539 | cupsCMYKSetLtDk(cmyk, 0, light, dark); | |
1540 | else | |
1541 | fprintf(stderr, "ERROR: Bad cupsCyanLtDk value \"%s\"!\n", | |
1542 | attr->value); | |
1543 | } | |
1544 | else | |
1545 | fprintf(stderr, "WARNING: No light cyan attribute found for %s!\n", | |
1546 | spec); | |
1547 | ||
1548 | /* | |
1549 | * Get the optional cupsLightMagentaXY, cupsLightMagentaGamma, or | |
1550 | * cupsMagentaLtDk attributes... | |
1551 | */ | |
1552 | ||
1553 | if ((attr = cupsFindAttr(ppd, "cupsLightMagentaXY", colormodel, media, | |
1554 | resolution, spec, sizeof(spec))) != NULL) | |
1555 | { | |
1556 | for (num_xypoints = 0, xyptr = xypoints; | |
1557 | attr != NULL && attr->value != NULL && num_xypoints < 100; | |
1558 | attr = ppdFindNextAttr(ppd, "cupsLightMagentaXY", spec)) | |
1559 | if (sscanf(attr->value, "%f%f", xyptr, xyptr + 1) == 2) | |
1560 | { | |
1561 | num_xypoints ++; | |
1562 | xyptr += 2; | |
1563 | } | |
1564 | ||
1565 | cupsCMYKSetCurve(cmyk, 3, num_xypoints, xypoints); | |
1566 | } | |
1567 | else if ((attr = cupsFindAttr(ppd, "cupsLightMagentaGamma", colormodel, | |
1568 | media, resolution, spec, | |
1569 | sizeof(spec))) != NULL) | |
1570 | { | |
1571 | if (sscanf(attr->value, "%f%f", &gamval, &density) == 2) | |
1572 | cupsCMYKSetGamma(cmyk, 3, gamval, density); | |
1573 | } | |
1574 | else if ((attr = cupsFindAttr(ppd, "cupsMagentaLtDk", colormodel, media, | |
1575 | resolution, spec, sizeof(spec))) != NULL) | |
1576 | { | |
1577 | if (sscanf(attr->value, "%f%f", &light, &dark) == 2) | |
1578 | cupsCMYKSetLtDk(cmyk, 2, light, dark); | |
1579 | else | |
1580 | fprintf(stderr, "ERROR: Bad cupsMagentaLtDk value \"%s\"!\n", | |
1581 | attr->value); | |
1582 | } | |
1583 | else | |
1584 | fprintf(stderr, "WARNING: No light magenta attribute found for %s!\n", | |
1585 | spec); | |
1586 | } | |
1587 | ||
1588 | /* | |
1589 | * Return the new profile... | |
1590 | */ | |
1591 | ||
1592 | return (cmyk); | |
1593 | } | |
1594 | ||
1595 | ||
1596 | /* | |
1597 | * 'cupsCMYKNew()' - Create a new CMYK color separation. | |
1598 | */ | |
1599 | ||
1600 | cups_cmyk_t * /* O - New CMYK separation or NULL */ | |
1601 | cupsCMYKNew(int num_channels) /* I - Number of color components */ | |
1602 | { | |
1603 | cups_cmyk_t *cmyk; /* New color separation */ | |
1604 | int i; /* Looping var */ | |
1605 | ||
1606 | ||
1607 | /* | |
1608 | * Range-check the input... | |
1609 | */ | |
1610 | ||
1611 | if (num_channels < 1) | |
1612 | return (NULL); | |
1613 | ||
1614 | /* | |
1615 | * Allocate memory for the separation... | |
1616 | */ | |
1617 | ||
1618 | if ((cmyk = calloc(1, sizeof(cups_cmyk_t))) == NULL) | |
1619 | return (NULL); | |
1620 | ||
1621 | /* | |
1622 | * Allocate memory for the LUTs... | |
1623 | */ | |
1624 | ||
1625 | cmyk->num_channels = num_channels; | |
1626 | ||
1627 | if ((cmyk->channels[0] = calloc(num_channels * 256, sizeof(short))) == NULL) | |
1628 | { | |
1629 | free(cmyk); | |
1630 | return (NULL); | |
1631 | } | |
1632 | ||
1633 | for (i = 1; i < num_channels; i ++) | |
1634 | cmyk->channels[i] = cmyk->channels[0] + i * 256; | |
1635 | ||
1636 | /* | |
1637 | * Fill in the LUTs with unity transitions... | |
1638 | */ | |
1639 | ||
1640 | for (i = 0; i < 256; i ++) | |
1641 | cmyk->black_lut[i] = i; | |
1642 | ||
1643 | switch (num_channels) | |
1644 | { | |
1645 | case 1 : /* K */ | |
1646 | case 2 : /* Kk */ | |
1647 | for (i = 0; i < 256; i ++) | |
1648 | { | |
1649 | cmyk->channels[0][i] = CUPS_MAX_LUT * i / 255; | |
1650 | } | |
1651 | break; | |
1652 | case 3 : /* CMY */ | |
1653 | for (i = 0; i < 256; i ++) | |
1654 | { | |
1655 | cmyk->channels[0][i] = CUPS_MAX_LUT * i / 255; | |
1656 | cmyk->channels[1][i] = CUPS_MAX_LUT * i / 255; | |
1657 | cmyk->channels[2][i] = CUPS_MAX_LUT * i / 255; | |
1658 | } | |
1659 | break; | |
1660 | case 4 : /* CMYK */ | |
1661 | for (i = 0; i < 256; i ++) | |
1662 | { | |
1663 | cmyk->channels[0][i] = CUPS_MAX_LUT * i / 255; | |
1664 | cmyk->channels[1][i] = CUPS_MAX_LUT * i / 255; | |
1665 | cmyk->channels[2][i] = CUPS_MAX_LUT * i / 255; | |
1666 | cmyk->channels[3][i] = CUPS_MAX_LUT * i / 255; | |
1667 | } | |
1668 | break; | |
1669 | case 6 : /* CcMmYK */ | |
1670 | case 7 : /* CcMmYKk */ | |
1671 | for (i = 0; i < 256; i ++) | |
1672 | { | |
1673 | cmyk->channels[0][i] = CUPS_MAX_LUT * i / 255; | |
1674 | cmyk->channels[2][i] = CUPS_MAX_LUT * i / 255; | |
1675 | cmyk->channels[4][i] = CUPS_MAX_LUT * i / 255; | |
1676 | cmyk->channels[5][i] = CUPS_MAX_LUT * i / 255; | |
1677 | } | |
1678 | break; | |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | * Return the separation... | |
1683 | */ | |
1684 | ||
1685 | return (cmyk); | |
1686 | } | |
1687 | ||
1688 | ||
1689 | /* | |
1690 | * 'cupsCMYKSetBlack()' - Set the transition range for CMY to black. | |
1691 | */ | |
1692 | ||
1693 | void | |
1694 | cupsCMYKSetBlack(cups_cmyk_t *cmyk, /* I - CMYK color separation */ | |
1695 | float lower, /* I - No black ink */ | |
1696 | float upper) /* I - Only black ink */ | |
1697 | { | |
1698 | int i, /* Looping var */ | |
1699 | delta, /* Difference between lower and upper */ | |
1700 | ilower, /* Lower level from 0 to 255 */ | |
1701 | iupper; /* Upper level from 0 to 255 */ | |
1702 | ||
1703 | ||
1704 | /* | |
1705 | * Range check input... | |
1706 | */ | |
1707 | ||
1708 | if (cmyk == NULL || lower < 0.0 || lower > 1.0 || upper < 0.0 || upper > 1.0 || | |
1709 | lower > upper) | |
1710 | return; | |
1711 | ||
1712 | /* | |
1713 | * Convert lower and upper to integers from 0 to 255... | |
1714 | */ | |
1715 | ||
1716 | ilower = (int)(255.0 * lower + 0.5); | |
1717 | iupper = (int)(255.0 * upper + 0.5); | |
1718 | delta = iupper - ilower; | |
1719 | ||
1720 | /* | |
1721 | * Generate the CMY-only data... | |
1722 | */ | |
1723 | ||
1724 | for (i = 0; i < ilower; i ++) | |
1725 | { | |
1726 | cmyk->black_lut[i] = 0; | |
1727 | cmyk->color_lut[i] = i; | |
1728 | } | |
1729 | ||
1730 | /* | |
1731 | * Then the transition data... | |
1732 | */ | |
1733 | ||
1734 | for (; i < iupper; i ++) | |
1735 | { | |
1736 | cmyk->black_lut[i] = iupper * (i - ilower) / delta; | |
1737 | cmyk->color_lut[i] = ilower - ilower * (i - ilower) / delta; | |
1738 | } | |
1739 | ||
1740 | /* | |
1741 | * Then the K-only data... | |
1742 | */ | |
1743 | ||
1744 | for (; i < 256; i ++) | |
1745 | { | |
1746 | cmyk->black_lut[i] = i; | |
1747 | cmyk->color_lut[i] = 0; | |
1748 | } | |
1749 | ||
1750 | fprintf(stderr, "DEBUG: cupsCMYKSetBlack(cmyk, lower=%.3f, upper=%.3f)\n", lower, upper); | |
1751 | ||
1752 | for (i = 0; i < 256; i += 17) | |
1753 | fprintf(stderr, "DEBUG: %3d = %3dk + %3dc\n", i, | |
1754 | cmyk->black_lut[i], cmyk->color_lut[i]); | |
1755 | } | |
1756 | ||
1757 | ||
1758 | /* | |
1759 | * 'cupsCMYKSetCurve()' - Set a color transform curve using points. | |
1760 | */ | |
1761 | ||
1762 | void | |
1763 | cupsCMYKSetCurve(cups_cmyk_t *cmyk, /* I - CMYK color separation */ | |
1764 | int channel, /* I - Color channel */ | |
1765 | int num_xypoints, | |
1766 | /* I - Number of X,Y points */ | |
1767 | const float *xypoints) /* I - X,Y points */ | |
1768 | { | |
1769 | int i; /* Looping var */ | |
1770 | int xstart; /* Start position */ | |
1771 | int xend; /* End position */ | |
1772 | int xdelta; /* Difference in position */ | |
1773 | int ystart; /* Start value */ | |
1774 | int yend; /* End value */ | |
1775 | int ydelta; /* Difference in value */ | |
1776 | ||
1777 | ||
1778 | /* | |
1779 | * Range check input... | |
1780 | */ | |
1781 | ||
1782 | if (cmyk == NULL || channel < 0 || channel >= cmyk->num_channels || | |
1783 | num_xypoints < 1 || xypoints == NULL) | |
1784 | return; | |
1785 | ||
1786 | /* | |
1787 | * Initialize the lookup table for the specified channel... | |
1788 | */ | |
1789 | ||
1790 | for (xstart = xend = 0, ystart = yend = 0; | |
1791 | num_xypoints > 0; | |
1792 | num_xypoints --, xypoints += 2, xstart = xend, ystart = yend) | |
1793 | { | |
1794 | xend = (int)(255.0 * xypoints[1] + 0.5); | |
1795 | yend = (int)(CUPS_MAX_LUT * xypoints[0] + 0.5); | |
1796 | xdelta = xend - xstart; | |
1797 | ydelta = yend - ystart; | |
1798 | ||
1799 | for (i = xstart; i < xend; i ++) | |
1800 | cmyk->channels[channel][i] = ystart + ydelta * (i - xstart) / xdelta; | |
1801 | } | |
1802 | ||
1803 | /* | |
1804 | * Initialize any trailing values to the maximum of the last data point... | |
1805 | */ | |
1806 | ||
1807 | for (i = xend; i < 256; i ++) | |
1808 | cmyk->channels[channel][i] = yend; | |
1809 | ||
1810 | fprintf(stderr, "DEBUG: cupsCMYKSetXY(cmyk, channel=%d, num_xypoints=%d, " | |
1811 | "xypoints=[%.3f %.3f %.3f %.3f ...])\n", channel, | |
1812 | num_xypoints, xypoints[0], xypoints[1], xypoints[2], xypoints[3]); | |
1813 | ||
1814 | for (i = 0; i < 256; i += 17) | |
1815 | fprintf(stderr, "DEBUG: %3d = %4d\n", i, | |
1816 | cmyk->channels[channel + 0][i]); | |
1817 | } | |
1818 | ||
1819 | ||
1820 | /* | |
1821 | * 'cupsCMYKSetGamma()' - Set a color transform curve using gamma and density. | |
1822 | */ | |
1823 | ||
1824 | void | |
1825 | cupsCMYKSetGamma(cups_cmyk_t *cmyk, /* I - CMYK color separation */ | |
1826 | int channel, /* I - Ink channel */ | |
1827 | float gamval, /* I - Gamma correction */ | |
1828 | float density) /* I - Maximum density */ | |
1829 | { | |
1830 | int i; /* Looping var */ | |
1831 | ||
1832 | ||
1833 | /* | |
1834 | * Range check input... | |
1835 | */ | |
1836 | ||
1837 | if (cmyk == NULL || channel < 0 || channel >= cmyk->num_channels || | |
1838 | gamval <= 0.0 || density <= 0.0 || density > 1.0) | |
1839 | return; | |
1840 | ||
1841 | /* | |
1842 | * Initialize the lookup table for the specified channel... | |
1843 | */ | |
1844 | ||
1845 | for (i = 0; i < 256; i ++) | |
1846 | cmyk->channels[channel][i] = (int)(density * CUPS_MAX_LUT * | |
1847 | pow((float)i / 255.0, gamval) + 0.5); | |
1848 | ||
1849 | fprintf(stderr, "DEBUG: cupsCMYKSetGamma(cmyk, channel=%d, gamval=%.3f, " | |
1850 | "density=%.3f)\n", channel, gamval, density); | |
1851 | ||
1852 | for (i = 0; i < 256; i += 17) | |
1853 | fprintf(stderr, "DEBUG: %3d = %4d\n", i, | |
1854 | cmyk->channels[channel + 0][i]); | |
1855 | } | |
1856 | ||
1857 | ||
1858 | /* | |
1859 | * 'cupsCMYKSetInkLimit()' - Set the limit on the amount of ink. | |
1860 | */ | |
1861 | ||
1862 | void | |
1863 | cupsCMYKSetInkLimit(cups_cmyk_t *cmyk, /* I - CMYK color separation */ | |
1864 | float limit) /* I - Limit of ink */ | |
1865 | { | |
1866 | if (!cmyk || limit < 0.0) | |
1867 | return; | |
1868 | ||
1869 | cmyk->ink_limit = limit * CUPS_MAX_LUT; | |
1870 | } | |
1871 | ||
1872 | ||
1873 | /* | |
1874 | * 'cupsCMYKSetLtDk()' - Set light/dark ink transforms. | |
1875 | */ | |
1876 | ||
1877 | void | |
1878 | cupsCMYKSetLtDk(cups_cmyk_t *cmyk, /* I - CMYK color separation */ | |
1879 | int channel, /* I - Dark ink channel (+1 for light) */ | |
1880 | float light, /* I - Light ink only level */ | |
1881 | float dark) /* I - Dark ink only level */ | |
1882 | { | |
1883 | int i, /* Looping var */ | |
1884 | delta, /* Difference between lower and upper */ | |
1885 | ilight, /* Light level from 0 to 255 */ | |
1886 | idark; /* Dark level from 0 to 255 */ | |
1887 | short lut[256]; /* Original LUT data */ | |
1888 | ||
1889 | ||
1890 | /* | |
1891 | * Range check input... | |
1892 | */ | |
1893 | ||
1894 | if (cmyk == NULL || light < 0.0 || light > 1.0 || dark < 0.0 || dark > 1.0 || | |
1895 | light > dark || channel < 0 || channel > (cmyk->num_channels - 2)) | |
1896 | return; | |
1897 | ||
1898 | /* | |
1899 | * Convert lower and upper to integers from 0 to 255... | |
1900 | */ | |
1901 | ||
1902 | ilight = (int)(255.0 * light + 0.5); | |
1903 | idark = (int)(255.0 * dark + 0.5); | |
1904 | delta = idark - ilight; | |
1905 | ||
1906 | /* | |
1907 | * Copy the dark ink LUT... | |
1908 | */ | |
1909 | ||
1910 | memcpy(lut, cmyk->channels[channel], sizeof(lut)); | |
1911 | ||
1912 | /* | |
1913 | * Generate the light-only data... | |
1914 | */ | |
1915 | ||
1916 | for (i = 0; i < ilight; i ++) | |
1917 | { | |
1918 | cmyk->channels[channel + 0][i] = 0; | |
1919 | cmyk->channels[channel + 1][i] = CUPS_MAX_LUT * i / ilight; | |
1920 | } | |
1921 | ||
1922 | /* | |
1923 | * Then the transition data... | |
1924 | */ | |
1925 | ||
1926 | for (; i < idark; i ++) | |
1927 | { | |
1928 | cmyk->channels[channel + 0][i] = CUPS_MAX_LUT * idark * (i - ilight) / | |
1929 | delta / 255; | |
1930 | cmyk->channels[channel + 1][i] = CUPS_MAX_LUT - CUPS_MAX_LUT * | |
1931 | (i - ilight) / delta; | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * Then the K-only data... | |
1936 | */ | |
1937 | ||
1938 | for (; i < 256; i ++) | |
1939 | { | |
1940 | cmyk->channels[channel + 0][i] = CUPS_MAX_LUT * i / 255; | |
1941 | cmyk->channels[channel + 1][i] = 0; | |
1942 | } | |
1943 | ||
1944 | fprintf(stderr, "DEBUG: cupsCMYKSetLtDk(cmyk, channel=%d, light=%.3f, " | |
1945 | "dark=%.3f)\n", channel, light, dark); | |
1946 | ||
1947 | for (i = 0; i < 256; i += 17) | |
1948 | fprintf(stderr, "DEBUG: %3d = %4dlt + %4ddk\n", i, | |
1949 | cmyk->channels[channel + 0][i], cmyk->channels[channel + 1][i]); | |
1950 | } | |
1951 | ||
1952 | ||
1953 | /* | |
1954 | * End of "$Id$". | |
1955 | */ |