1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 // This file is available under and governed by the GNU General Public
26 // License version 2 only, as published by the Free Software Foundation.
27 // However, the following notice accompanied the original version of this
28 // file:
29 //
30 //---------------------------------------------------------------------------------
31 //
32 // Little Color Management System
33 // Copyright (c) 1998-2011 Marti Maria Saguer
34 //
35 // Permission is hereby granted, free of charge, to any person obtaining
36 // a copy of this software and associated documentation files (the "Software"),
37 // to deal in the Software without restriction, including without limitation
38 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
39 // and/or sell copies of the Software, and to permit persons to whom the Software
40 // is furnished to do so, subject to the following conditions:
41 //
42 // The above copyright notice and this permission notice shall be included in
43 // all copies or substantial portions of the Software.
44 //
45 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
46 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
47 // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
48 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
49 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
50 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
51 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
52 //
53 //---------------------------------------------------------------------------------
54 //
55
56 #include "lcms2_internal.h"
57
58 // PostScript ColorRenderingDictionary and ColorSpaceArray
59
60
61 #define MAXPSCOLS 60 // Columns on tables
62
63 /*
64 Implementation
65 --------------
66
67 PostScript does use XYZ as its internal PCS. But since PostScript
68 interpolation tables are limited to 8 bits, I use Lab as a way to
69 improve the accuracy, favoring perceptual results. So, for the creation
70 of each CRD, CSA the profiles are converted to Lab via a device
71 link between profile -> Lab or Lab -> profile. The PS code necessary to
72 convert Lab <-> XYZ is also included.
73
74
75
76 Color Space Arrays (CSA)
77 ==================================================================================
78
79 In order to obtain precision, code chooses between three ways to implement
80 the device -> XYZ transform. These cases identifies monochrome profiles (often
81 implemented as a set of curves), matrix-shaper and Pipeline-based.
82
83 Monochrome
84 -----------
85
86 This is implemented as /CIEBasedA CSA. The prelinearization curve is
87 placed into /DecodeA section, and matrix equals to D50. Since here is
88 no interpolation tables, I do the conversion directly to XYZ
89
90 NOTE: CLUT-based monochrome profiles are NOT supported. So, cmsFLAGS_MATRIXINPUT
91 flag is forced on such profiles.
92
93 [ /CIEBasedA
94 <<
95 /DecodeA { transfer function } bind
96 /MatrixA [D50]
97 /RangeLMN [ 0.0 cmsD50X 0.0 cmsD50Y 0.0 cmsD50Z ]
98 /WhitePoint [D50]
99 /BlackPoint [BP]
100 /RenderingIntent (intent)
101 >>
102 ]
103
104 On simpler profiles, the PCS is already XYZ, so no conversion is required.
105
106
107 Matrix-shaper based
108 -------------------
109
110 This is implemented both with /CIEBasedABC or /CIEBasedDEF on dependig
111 of profile implementation. Since here there are no interpolation tables, I do
112 the conversion directly to XYZ
113
114
115
116 [ /CIEBasedABC
117 <<
118 /DecodeABC [ {transfer1} {transfer2} {transfer3} ]
119 /MatrixABC [Matrix]
120 /RangeLMN [ 0.0 cmsD50X 0.0 cmsD50Y 0.0 cmsD50Z ]
121 /DecodeLMN [ { / 2} dup dup ]
122 /WhitePoint [D50]
123 /BlackPoint [BP]
124 /RenderingIntent (intent)
125 >>
126 ]
127
128
129 CLUT based
130 ----------
131
132 Lab is used in such cases.
133
134 [ /CIEBasedDEF
135 <<
136 /DecodeDEF [ <prelinearization> ]
137 /Table [ p p p [<...>]]
138 /RangeABC [ 0 1 0 1 0 1]
139 /DecodeABC[ <postlinearization> ]
140 /RangeLMN [ -0.236 1.254 0 1 -0.635 1.640 ]
141 % -128/500 1+127/500 0 1 -127/200 1+128/200
142 /MatrixABC [ 1 1 1 1 0 0 0 0 -1]
143 /WhitePoint [D50]
144 /BlackPoint [BP]
145 /RenderingIntent (intent)
146 ]
147
148
149 Color Rendering Dictionaries (CRD)
150 ==================================
151 These are always implemented as CLUT, and always are using Lab. Since CRD are expected to
152 be used as resources, the code adds the definition as well.
153
154 <<
155 /ColorRenderingType 1
156 /WhitePoint [ D50 ]
157 /BlackPoint [BP]
158 /MatrixPQR [ Bradford ]
159 /RangePQR [-0.125 1.375 -0.125 1.375 -0.125 1.375 ]
160 /TransformPQR [
161 {4 index 3 get div 2 index 3 get mul exch pop exch pop exch pop exch pop } bind
162 {4 index 4 get div 2 index 4 get mul exch pop exch pop exch pop exch pop } bind
163 {4 index 5 get div 2 index 5 get mul exch pop exch pop exch pop exch pop } bind
164 ]
165 /MatrixABC <...>
166 /EncodeABC <...>
167 /RangeABC <.. used for XYZ -> Lab>
168 /EncodeLMN
169 /RenderTable [ p p p [<...>]]
170
171 /RenderingIntent (Perceptual)
172 >>
173 /Current exch /ColorRendering defineresource pop
174
175
176 The following stages are used to convert from XYZ to Lab
177 --------------------------------------------------------
178
179 Input is given at LMN stage on X, Y, Z
180
181 Encode LMN gives us f(X/Xn), f(Y/Yn), f(Z/Zn)
182
183 /EncodeLMN [
184
185 { 0.964200 div dup 0.008856 le {7.787 mul 16 116 div add}{1 3 div exp} ifelse } bind
186 { 1.000000 div dup 0.008856 le {7.787 mul 16 116 div add}{1 3 div exp} ifelse } bind
187 { 0.824900 div dup 0.008856 le {7.787 mul 16 116 div add}{1 3 div exp} ifelse } bind
188
189 ]
190
191
192 MatrixABC is used to compute f(Y/Yn), f(X/Xn) - f(Y/Yn), f(Y/Yn) - f(Z/Zn)
193
194 | 0 1 0|
195 | 1 -1 0|
196 | 0 1 -1|
197
198 /MatrixABC [ 0 1 0 1 -1 1 0 0 -1 ]
199
200 EncodeABC finally gives Lab values.
201
202 /EncodeABC [
203 { 116 mul 16 sub 100 div } bind
204 { 500 mul 128 add 255 div } bind
205 { 200 mul 128 add 255 div } bind
206 ]
207
208 The following stages are used to convert Lab to XYZ
209 ----------------------------------------------------
210
211 /RangeABC [ 0 1 0 1 0 1]
212 /DecodeABC [ { 100 mul 16 add 116 div } bind
213 { 255 mul 128 sub 500 div } bind
214 { 255 mul 128 sub 200 div } bind
215 ]
216
217 /MatrixABC [ 1 1 1 1 0 0 0 0 -1]
218 /DecodeLMN [
219 {dup 6 29 div ge {dup dup mul mul} {4 29 div sub 108 841 div mul} ifelse 0.964200 mul} bind
220 {dup 6 29 div ge {dup dup mul mul} {4 29 div sub 108 841 div mul} ifelse } bind
221 {dup 6 29 div ge {dup dup mul mul} {4 29 div sub 108 841 div mul} ifelse 0.824900 mul} bind
222 ]
223
224
225 */
226
227 /*
228
229 PostScript algorithms discussion.
230 =========================================================================================================
231
232 1D interpolation algorithm
233
234
235 1D interpolation (float)
236 ------------------------
237
238 val2 = Domain * Value;
239
240 cell0 = (int) floor(val2);
241 cell1 = (int) ceil(val2);
242
243 rest = val2 - cell0;
244
245 y0 = LutTable[cell0] ;
246 y1 = LutTable[cell1] ;
247
248 y = y0 + (y1 - y0) * rest;
249
250
251
252 PostScript code Stack
253 ================================================
254
255 { % v
256 <check 0..1.0>
257 [array] % v tab
258 dup % v tab tab
259 length 1 sub % v tab dom
260
261 3 -1 roll % tab dom v
262
263 mul % tab val2
264 dup % tab val2 val2
265 dup % tab val2 val2 val2
266 floor cvi % tab val2 val2 cell0
267 exch % tab val2 cell0 val2
268 ceiling cvi % tab val2 cell0 cell1
269
270 3 index % tab val2 cell0 cell1 tab
271 exch % tab val2 cell0 tab cell1
272 get % tab val2 cell0 y1
273
274 4 -1 roll % val2 cell0 y1 tab
275 3 -1 roll % val2 y1 tab cell0
276 get % val2 y1 y0
277
278 dup % val2 y1 y0 y0
279 3 1 roll % val2 y0 y1 y0
280
281 sub % val2 y0 (y1-y0)
282 3 -1 roll % y0 (y1-y0) val2
283 dup % y0 (y1-y0) val2 val2
284 floor cvi % y0 (y1-y0) val2 floor(val2)
285 sub % y0 (y1-y0) rest
286 mul % y0 t1
287 add % y
288 65535 div % result
289
290 } bind
291
292
293 */
294
295
296 // This struct holds the memory block currently being write
297 typedef struct {
298 _cmsStageCLutData* Pipeline;
299 cmsIOHANDLER* m;
300
301 int FirstComponent;
302 int SecondComponent;
303
304 const char* PreMaj;
305 const char* PostMaj;
306 const char* PreMin;
307 const char* PostMin;
308
309 int FixWhite; // Force mapping of pure white
310
311 cmsColorSpaceSignature ColorSpace; // ColorSpace of profile
312
313
314 } cmsPsSamplerCargo;
315
316 static int _cmsPSActualColumn = 0;
317
318
319 // Convert to byte
320 static
321 cmsUInt8Number Word2Byte(cmsUInt16Number w)
322 {
323 return (cmsUInt8Number) floor((cmsFloat64Number) w / 257.0 + 0.5);
324 }
325
326
327 // Convert to byte (using ICC2 notation)
328 /*
329 static
330 cmsUInt8Number L2Byte(cmsUInt16Number w)
331 {
332 int ww = w + 0x0080;
333
334 if (ww > 0xFFFF) return 0xFF;
335
336 return (cmsUInt8Number) ((cmsUInt16Number) (ww >> 8) & 0xFF);
337 }
338 */
339
340 // Write a cooked byte
341
342 static
343 void WriteByte(cmsIOHANDLER* m, cmsUInt8Number b)
344 {
345 _cmsIOPrintf(m, "%02x", b);
346 _cmsPSActualColumn += 2;
347
348 if (_cmsPSActualColumn > MAXPSCOLS) {
349
350 _cmsIOPrintf(m, "\n");
351 _cmsPSActualColumn = 0;
352 }
353 }
354
355 // ----------------------------------------------------------------- PostScript generation
356
357
358 // Removes offending Carriage returns
359 static
360 char* RemoveCR(const char* txt)
361 {
362 static char Buffer[2048];
363 char* pt;
364
365 strncpy(Buffer, txt, 2047);
366 Buffer[2047] = 0;
367 for (pt = Buffer; *pt; pt++)
368 if (*pt == '\n' || *pt == '\r') *pt = ' ';
369
370 return Buffer;
371
372 }
373
374 static
375 void EmitHeader(cmsIOHANDLER* m, const char* Title, cmsHPROFILE hProfile)
376 {
377 time_t timer;
378 cmsMLU *Description, *Copyright;
379 char DescASCII[256], CopyrightASCII[256];
380
381 time(&timer);
382
383 Description = (cmsMLU*) cmsReadTag(hProfile, cmsSigProfileDescriptionTag);
384 Copyright = (cmsMLU*) cmsReadTag(hProfile, cmsSigCopyrightTag);
385
386 DescASCII[0] = DescASCII[255] = 0;
387 CopyrightASCII[0] = CopyrightASCII[255] = 0;
388
389 if (Description != NULL) cmsMLUgetASCII(Description, cmsNoLanguage, cmsNoCountry, DescASCII, 255);
390 if (Copyright != NULL) cmsMLUgetASCII(Copyright, cmsNoLanguage, cmsNoCountry, CopyrightASCII, 255);
391
392 _cmsIOPrintf(m, "%%!PS-Adobe-3.0\n");
393 _cmsIOPrintf(m, "%%\n");
394 _cmsIOPrintf(m, "%% %s\n", Title);
395 _cmsIOPrintf(m, "%% Source: %s\n", RemoveCR(DescASCII));
396 _cmsIOPrintf(m, "%% %s\n", RemoveCR(CopyrightASCII));
397 _cmsIOPrintf(m, "%% Created: %s", ctime(&timer)); // ctime appends a \n!!!
398 _cmsIOPrintf(m, "%%\n");
399 _cmsIOPrintf(m, "%%%%BeginResource\n");
400
401 }
402
403
404 // Emits White & Black point. White point is always D50, Black point is the device
405 // Black point adapted to D50.
406
407 static
408 void EmitWhiteBlackD50(cmsIOHANDLER* m, cmsCIEXYZ* BlackPoint)
409 {
410
411 _cmsIOPrintf(m, "/BlackPoint [%f %f %f]\n", BlackPoint -> X,
412 BlackPoint -> Y,
413 BlackPoint -> Z);
414
415 _cmsIOPrintf(m, "/WhitePoint [%f %f %f]\n", cmsD50_XYZ()->X,
416 cmsD50_XYZ()->Y,
417 cmsD50_XYZ()->Z);
418 }
419
420
421 static
422 void EmitRangeCheck(cmsIOHANDLER* m)
423 {
424 _cmsIOPrintf(m, "dup 0.0 lt { pop 0.0 } if "
425 "dup 1.0 gt { pop 1.0 } if ");
426
427 }
428
429 // Does write the intent
430
431 static
432 void EmitIntent(cmsIOHANDLER* m, int RenderingIntent)
433 {
434 const char *intent;
435
436 switch (RenderingIntent) {
437
438 case INTENT_PERCEPTUAL: intent = "Perceptual"; break;
439 case INTENT_RELATIVE_COLORIMETRIC: intent = "RelativeColorimetric"; break;
440 case INTENT_ABSOLUTE_COLORIMETRIC: intent = "AbsoluteColorimetric"; break;
441 case INTENT_SATURATION: intent = "Saturation"; break;
442
443 default: intent = "Undefined"; break;
444 }
445
446 _cmsIOPrintf(m, "/RenderingIntent (%s)\n", intent );
447 }
448
449 //
450 // Convert L* to Y
451 //
452 // Y = Yn*[ (L* + 16) / 116] ^ 3 if (L*) >= 6 / 29
453 // = Yn*( L* / 116) / 7.787 if (L*) < 6 / 29
454 //
455
456 /*
457 static
458 void EmitL2Y(cmsIOHANDLER* m)
459 {
460 _cmsIOPrintf(m,
461 "{ "
462 "100 mul 16 add 116 div " // (L * 100 + 16) / 116
463 "dup 6 29 div ge " // >= 6 / 29 ?
464 "{ dup dup mul mul } " // yes, ^3 and done
465 "{ 4 29 div sub 108 841 div mul } " // no, slope limiting
466 "ifelse } bind ");
467 }
468 */
469
470
471 // Lab -> XYZ, see the discussion above
472
473 static
474 void EmitLab2XYZ(cmsIOHANDLER* m)
475 {
476 _cmsIOPrintf(m, "/RangeABC [ 0 1 0 1 0 1]\n");
477 _cmsIOPrintf(m, "/DecodeABC [\n");
478 _cmsIOPrintf(m, "{100 mul 16 add 116 div } bind\n");
479 _cmsIOPrintf(m, "{255 mul 128 sub 500 div } bind\n");
480 _cmsIOPrintf(m, "{255 mul 128 sub 200 div } bind\n");
481 _cmsIOPrintf(m, "]\n");
482 _cmsIOPrintf(m, "/MatrixABC [ 1 1 1 1 0 0 0 0 -1]\n");
483 _cmsIOPrintf(m, "/RangeLMN [ -0.236 1.254 0 1 -0.635 1.640 ]\n");
484 _cmsIOPrintf(m, "/DecodeLMN [\n");
485 _cmsIOPrintf(m, "{dup 6 29 div ge {dup dup mul mul} {4 29 div sub 108 841 div mul} ifelse 0.964200 mul} bind\n");
486 _cmsIOPrintf(m, "{dup 6 29 div ge {dup dup mul mul} {4 29 div sub 108 841 div mul} ifelse } bind\n");
487 _cmsIOPrintf(m, "{dup 6 29 div ge {dup dup mul mul} {4 29 div sub 108 841 div mul} ifelse 0.824900 mul} bind\n");
488 _cmsIOPrintf(m, "]\n");
489 }
490
491
492
493 // Outputs a table of words. It does use 16 bits
494
495 static
496 void Emit1Gamma(cmsIOHANDLER* m, cmsToneCurve* Table)
497 {
498 cmsUInt32Number i;
499 cmsFloat64Number gamma;
500
501 if (Table == NULL) return; // Error
502
503 if (Table ->nEntries <= 0) return; // Empty table
504
505 // Suppress whole if identity
506 if (cmsIsToneCurveLinear(Table)) return;
507
508 // Check if is really an exponential. If so, emit "exp"
509 gamma = cmsEstimateGamma(Table, 0.001);
510 if (gamma > 0) {
511 _cmsIOPrintf(m, "{ %g exp } bind ", gamma);
512 return;
513 }
514
515 _cmsIOPrintf(m, "{ ");
516
517 // Bounds check
518 EmitRangeCheck(m);
519
520 // Emit intepolation code
521
522 // PostScript code Stack
523 // =============== ========================
524 // v
525 _cmsIOPrintf(m, " [");
526
527 for (i=0; i < Table->nEntries; i++) {
528 _cmsIOPrintf(m, "%d ", Table->Table16[i]);
529 }
530
531 _cmsIOPrintf(m, "] "); // v tab
532
533 _cmsIOPrintf(m, "dup "); // v tab tab
534 _cmsIOPrintf(m, "length 1 sub "); // v tab dom
535 _cmsIOPrintf(m, "3 -1 roll "); // tab dom v
536 _cmsIOPrintf(m, "mul "); // tab val2
537 _cmsIOPrintf(m, "dup "); // tab val2 val2
538 _cmsIOPrintf(m, "dup "); // tab val2 val2 val2
539 _cmsIOPrintf(m, "floor cvi "); // tab val2 val2 cell0
540 _cmsIOPrintf(m, "exch "); // tab val2 cell0 val2
541 _cmsIOPrintf(m, "ceiling cvi "); // tab val2 cell0 cell1
542 _cmsIOPrintf(m, "3 index "); // tab val2 cell0 cell1 tab
543 _cmsIOPrintf(m, "exch "); // tab val2 cell0 tab cell1
544 _cmsIOPrintf(m, "get "); // tab val2 cell0 y1
545 _cmsIOPrintf(m, "4 -1 roll "); // val2 cell0 y1 tab
546 _cmsIOPrintf(m, "3 -1 roll "); // val2 y1 tab cell0
547 _cmsIOPrintf(m, "get "); // val2 y1 y0
548 _cmsIOPrintf(m, "dup "); // val2 y1 y0 y0
549 _cmsIOPrintf(m, "3 1 roll "); // val2 y0 y1 y0
550 _cmsIOPrintf(m, "sub "); // val2 y0 (y1-y0)
551 _cmsIOPrintf(m, "3 -1 roll "); // y0 (y1-y0) val2
552 _cmsIOPrintf(m, "dup "); // y0 (y1-y0) val2 val2
553 _cmsIOPrintf(m, "floor cvi "); // y0 (y1-y0) val2 floor(val2)
554 _cmsIOPrintf(m, "sub "); // y0 (y1-y0) rest
555 _cmsIOPrintf(m, "mul "); // y0 t1
556 _cmsIOPrintf(m, "add "); // y
557 _cmsIOPrintf(m, "65535 div "); // result
558
559 _cmsIOPrintf(m, " } bind ");
560 }
561
562
563 // Compare gamma table
564
565 static
566 cmsBool GammaTableEquals(cmsUInt16Number* g1, cmsUInt16Number* g2, int nEntries)
567 {
568 return memcmp(g1, g2, nEntries* sizeof(cmsUInt16Number)) == 0;
569 }
570
571
572 // Does write a set of gamma curves
573
574 static
575 void EmitNGamma(cmsIOHANDLER* m, int n, cmsToneCurve* g[])
576 {
577 int i;
578
579 for( i=0; i < n; i++ )
580 {
581 if (g[i] == NULL) return; // Error
582
583 if (i > 0 && GammaTableEquals(g[i-1]->Table16, g[i]->Table16, g[i]->nEntries)) {
584
585 _cmsIOPrintf(m, "dup ");
586 }
587 else {
588 Emit1Gamma(m, g[i]);
589 }
590 }
591
592 }
593
594
595
596
597
598 // Following code dumps a LUT onto memory stream
599
600
601 // This is the sampler. Intended to work in SAMPLER_INSPECT mode,
602 // that is, the callback will be called for each knot with
603 //
604 // In[] The grid location coordinates, normalized to 0..ffff
605 // Out[] The Pipeline values, normalized to 0..ffff
606 //
607 // Returning a value other than 0 does terminate the sampling process
608 //
609 // Each row contains Pipeline values for all but first component. So, I
610 // detect row changing by keeping a copy of last value of first
611 // component. -1 is used to mark begining of whole block.
612
613 static
614 int OutputValueSampler(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register void* Cargo)
615 {
616 cmsPsSamplerCargo* sc = (cmsPsSamplerCargo*) Cargo;
617 cmsUInt32Number i;
618
619
620 if (sc -> FixWhite) {
621
622 if (In[0] == 0xFFFF) { // Only in L* = 100, ab = [-8..8]
623
624 if ((In[1] >= 0x7800 && In[1] <= 0x8800) &&
625 (In[2] >= 0x7800 && In[2] <= 0x8800)) {
626
627 cmsUInt16Number* Black;
628 cmsUInt16Number* White;
629 cmsUInt32Number nOutputs;
630
631 if (!_cmsEndPointsBySpace(sc ->ColorSpace, &White, &Black, &nOutputs))
632 return 0;
633
634 for (i=0; i < nOutputs; i++)
635 Out[i] = White[i];
636 }
637
638
639 }
640 }
641
642
643 // Hadle the parenthesis on rows
644
645 if (In[0] != sc ->FirstComponent) {
646
647 if (sc ->FirstComponent != -1) {
648
649 _cmsIOPrintf(sc ->m, sc ->PostMin);
650 sc ->SecondComponent = -1;
651 _cmsIOPrintf(sc ->m, sc ->PostMaj);
652 }
653
654 // Begin block
655 _cmsPSActualColumn = 0;
656
657 _cmsIOPrintf(sc ->m, sc ->PreMaj);
658 sc ->FirstComponent = In[0];
659 }
660
661
662 if (In[1] != sc ->SecondComponent) {
663
664 if (sc ->SecondComponent != -1) {
665
666 _cmsIOPrintf(sc ->m, sc ->PostMin);
667 }
668
669 _cmsIOPrintf(sc ->m, sc ->PreMin);
670 sc ->SecondComponent = In[1];
671 }
672
673 // Dump table.
674
675 for (i=0; i < sc -> Pipeline ->Params->nOutputs; i++) {
676
677 cmsUInt16Number wWordOut = Out[i];
678 cmsUInt8Number wByteOut; // Value as byte
679
680
681 // We always deal with Lab4
682
683 wByteOut = Word2Byte(wWordOut);
684 WriteByte(sc -> m, wByteOut);
685 }
686
687 return 1;
688 }
689
690 // Writes a Pipeline on memstream. Could be 8 or 16 bits based
691
692 static
693 void WriteCLUT(cmsIOHANDLER* m, cmsStage* mpe, const char* PreMaj,
694 const char* PostMaj,
695 const char* PreMin,
696 const char* PostMin,
697 int FixWhite,
698 cmsColorSpaceSignature ColorSpace)
699 {
700 cmsUInt32Number i;
701 cmsPsSamplerCargo sc;
702
703 sc.FirstComponent = -1;
704 sc.SecondComponent = -1;
705 sc.Pipeline = (_cmsStageCLutData *) mpe ->Data;
706 sc.m = m;
707 sc.PreMaj = PreMaj;
708 sc.PostMaj= PostMaj;
709
710 sc.PreMin = PreMin;
711 sc.PostMin = PostMin;
712 sc.FixWhite = FixWhite;
713 sc.ColorSpace = ColorSpace;
714
715 _cmsIOPrintf(m, "[");
716
717 for (i=0; i < sc.Pipeline->Params->nInputs; i++)
718 _cmsIOPrintf(m, " %d ", sc.Pipeline->Params->nSamples[i]);
719
720 _cmsIOPrintf(m, " [\n");
721
722 cmsStageSampleCLut16bit(mpe, OutputValueSampler, (void*) &sc, SAMPLER_INSPECT);
723
724 _cmsIOPrintf(m, PostMin);
725 _cmsIOPrintf(m, PostMaj);
726 _cmsIOPrintf(m, "] ");
727
728 }
729
730
731 // Dumps CIEBasedA Color Space Array
732
733 static
734 int EmitCIEBasedA(cmsIOHANDLER* m, cmsToneCurve* Curve, cmsCIEXYZ* BlackPoint)
735 {
736
737 _cmsIOPrintf(m, "[ /CIEBasedA\n");
738 _cmsIOPrintf(m, " <<\n");
739
740 _cmsIOPrintf(m, "/DecodeA ");
741
742 Emit1Gamma(m, Curve);
743
744 _cmsIOPrintf(m, " \n");
745
746 _cmsIOPrintf(m, "/MatrixA [ 0.9642 1.0000 0.8249 ]\n");
747 _cmsIOPrintf(m, "/RangeLMN [ 0.0 0.9642 0.0 1.0000 0.0 0.8249 ]\n");
748
749 EmitWhiteBlackD50(m, BlackPoint);
750 EmitIntent(m, INTENT_PERCEPTUAL);
751
752 _cmsIOPrintf(m, ">>\n");
753 _cmsIOPrintf(m, "]\n");
754
755 return 1;
756 }
757
758
759 // Dumps CIEBasedABC Color Space Array
760
761 static
762 int EmitCIEBasedABC(cmsIOHANDLER* m, cmsFloat64Number* Matrix, cmsToneCurve** CurveSet, cmsCIEXYZ* BlackPoint)
763 {
764 int i;
765
766 _cmsIOPrintf(m, "[ /CIEBasedABC\n");
767 _cmsIOPrintf(m, "<<\n");
768 _cmsIOPrintf(m, "/DecodeABC [ ");
769
770 EmitNGamma(m, 3, CurveSet);
771
772 _cmsIOPrintf(m, "]\n");
773
774 _cmsIOPrintf(m, "/MatrixABC [ " );
775
776 for( i=0; i < 3; i++ ) {
777
778 _cmsIOPrintf(m, "%.6f %.6f %.6f ", Matrix[i + 3*0],
779 Matrix[i + 3*1],
780 Matrix[i + 3*2]);
781 }
782
783
784 _cmsIOPrintf(m, "]\n");
785
786 _cmsIOPrintf(m, "/RangeLMN [ 0.0 0.9642 0.0 1.0000 0.0 0.8249 ]\n");
787
788 EmitWhiteBlackD50(m, BlackPoint);
789 EmitIntent(m, INTENT_PERCEPTUAL);
790
791 _cmsIOPrintf(m, ">>\n");
792 _cmsIOPrintf(m, "]\n");
793
794
795 return 1;
796 }
797
798
799 static
800 int EmitCIEBasedDEF(cmsIOHANDLER* m, cmsPipeline* Pipeline, int Intent, cmsCIEXYZ* BlackPoint)
801 {
802 const char* PreMaj;
803 const char* PostMaj;
804 const char* PreMin, *PostMin;
805 cmsStage* mpe;
806
807 mpe = Pipeline ->Elements;
808
809 switch (cmsStageInputChannels(mpe)) {
810 case 3:
811
812 _cmsIOPrintf(m, "[ /CIEBasedDEF\n");
813 PreMaj ="<";
814 PostMaj= ">\n";
815 PreMin = PostMin = "";
816 break;
817 case 4:
818 _cmsIOPrintf(m, "[ /CIEBasedDEFG\n");
819 PreMaj = "[";
820 PostMaj = "]\n";
821 PreMin = "<";
822 PostMin = ">\n";
823 break;
824 default:
825 return 0;
826
827 }
828
829 _cmsIOPrintf(m, "<<\n");
830
831 if (cmsStageType(mpe) == cmsSigCurveSetElemType) {
832
833 _cmsIOPrintf(m, "/DecodeDEF [ ");
834 EmitNGamma(m, cmsStageOutputChannels(mpe), _cmsStageGetPtrToCurveSet(mpe));
835 _cmsIOPrintf(m, "]\n");
836
837 mpe = mpe ->Next;
838 }
839
840 if (cmsStageType(mpe) == cmsSigCLutElemType) {
841
842 _cmsIOPrintf(m, "/Table ");
843 WriteCLUT(m, mpe, PreMaj, PostMaj, PreMin, PostMin, FALSE, (cmsColorSpaceSignature) 0);
844 _cmsIOPrintf(m, "]\n");
845 }
846
847 EmitLab2XYZ(m);
848 EmitWhiteBlackD50(m, BlackPoint);
849 EmitIntent(m, Intent);
850
851 _cmsIOPrintf(m, " >>\n");
852 _cmsIOPrintf(m, "]\n");
853
854 return 1;
855 }
856
857 // Generates a curve from a gray profile
858
859 static
860 cmsToneCurve* ExtractGray2Y(cmsContext ContextID, cmsHPROFILE hProfile, int Intent)
861 {
862 cmsToneCurve* Out = cmsBuildTabulatedToneCurve16(ContextID, 256, NULL);
863 cmsHPROFILE hXYZ = cmsCreateXYZProfile();
864 cmsHTRANSFORM xform = cmsCreateTransformTHR(ContextID, hProfile, TYPE_GRAY_8, hXYZ, TYPE_XYZ_DBL, Intent, cmsFLAGS_NOOPTIMIZE);
865 int i;
866
867 if (Out != NULL) {
868 for (i=0; i < 256; i++) {
869
870 cmsUInt8Number Gray = (cmsUInt8Number) i;
871 cmsCIEXYZ XYZ;
872
873 cmsDoTransform(xform, &Gray, &XYZ, 1);
874
875 Out ->Table16[i] =_cmsQuickSaturateWord(XYZ.Y * 65535.0);
876 }
877 }
878
879 cmsDeleteTransform(xform);
880 cmsCloseProfile(hXYZ);
881 return Out;
882 }
883
884
885
886 // Because PostScript has only 8 bits in /Table, we should use
887 // a more perceptually uniform space... I do choose Lab.
888
889 static
890 int WriteInputLUT(cmsIOHANDLER* m, cmsHPROFILE hProfile, int Intent, cmsUInt32Number dwFlags)
891 {
892 cmsHPROFILE hLab;
893 cmsHTRANSFORM xform;
894 cmsUInt32Number nChannels;
895 cmsUInt32Number InputFormat;
896 int rc;
897 cmsHPROFILE Profiles[2];
898 cmsCIEXYZ BlackPointAdaptedToD50;
899
900 // Does create a device-link based transform.
901 // The DeviceLink is next dumped as working CSA.
902
903 InputFormat = cmsFormatterForColorspaceOfProfile(hProfile, 2, FALSE);
904 nChannels = T_CHANNELS(InputFormat);
905
906
907 cmsDetectBlackPoint(&BlackPointAdaptedToD50, hProfile, Intent, 0);
908
909 // Adjust output to Lab4
910 hLab = cmsCreateLab4ProfileTHR(m ->ContextID, NULL);
911
912 Profiles[0] = hProfile;
913 Profiles[1] = hLab;
914
915 xform = cmsCreateMultiprofileTransform(Profiles, 2, InputFormat, TYPE_Lab_DBL, Intent, 0);
916 cmsCloseProfile(hLab);
917
918 if (xform == NULL) {
919
920 cmsSignalError(m ->ContextID, cmsERROR_COLORSPACE_CHECK, "Cannot create transform Profile -> Lab");
921 return 0;
922 }
923
924 // Only 1, 3 and 4 channels are allowed
925
926 switch (nChannels) {
927
928 case 1: {
929 cmsToneCurve* Gray2Y = ExtractGray2Y(m ->ContextID, hProfile, Intent);
930 EmitCIEBasedA(m, Gray2Y, &BlackPointAdaptedToD50);
931 cmsFreeToneCurve(Gray2Y);
932 }
933 break;
934
935 case 3:
936 case 4: {
937 cmsUInt32Number OutFrm = TYPE_Lab_16;
938 cmsPipeline* DeviceLink;
939 _cmsTRANSFORM* v = (_cmsTRANSFORM*) xform;
940
941 DeviceLink = cmsPipelineDup(v ->Lut);
942 if (DeviceLink == NULL) return 0;
943
944 dwFlags |= cmsFLAGS_FORCE_CLUT;
945 _cmsOptimizePipeline(m->ContextID, &DeviceLink, Intent, &InputFormat, &OutFrm, &dwFlags);
946
947 rc = EmitCIEBasedDEF(m, DeviceLink, Intent, &BlackPointAdaptedToD50);
948 cmsPipelineFree(DeviceLink);
949 if (rc == 0) return 0;
950 }
951 break;
952
953 default:
954
955 cmsSignalError(m ->ContextID, cmsERROR_COLORSPACE_CHECK, "Only 3, 4 channels supported for CSA. This profile has %d channels.", nChannels);
956 return 0;
957 }
958
959
960 cmsDeleteTransform(xform);
961
962 return 1;
963 }
964
965 static
966 cmsFloat64Number* GetPtrToMatrix(const cmsStage* mpe)
967 {
968 _cmsStageMatrixData* Data = (_cmsStageMatrixData*) mpe ->Data;
969
970 return Data -> Double;
971 }
972
973
974 // Does create CSA based on matrix-shaper. Allowed types are gray and RGB based
975
976 static
977 int WriteInputMatrixShaper(cmsIOHANDLER* m, cmsHPROFILE hProfile, cmsStage* Matrix, cmsStage* Shaper)
978 {
979 cmsColorSpaceSignature ColorSpace;
980 int rc;
981 cmsCIEXYZ BlackPointAdaptedToD50;
982
983 ColorSpace = cmsGetColorSpace(hProfile);
984
985 cmsDetectBlackPoint(&BlackPointAdaptedToD50, hProfile, INTENT_RELATIVE_COLORIMETRIC, 0);
986
987 if (ColorSpace == cmsSigGrayData) {
988
989 cmsToneCurve** ShaperCurve = _cmsStageGetPtrToCurveSet(Shaper);
990 rc = EmitCIEBasedA(m, ShaperCurve[0], &BlackPointAdaptedToD50);
991
992 }
993 else
994 if (ColorSpace == cmsSigRgbData) {
995
996 cmsMAT3 Mat;
997 int i, j;
998
999 memmove(&Mat, GetPtrToMatrix(Matrix), sizeof(Mat));
1000
1001 for (i=0; i < 3; i++)
1002 for (j=0; j < 3; j++)
1003 Mat.v[i].n[j] *= MAX_ENCODEABLE_XYZ;
1004
1005 rc = EmitCIEBasedABC(m, (cmsFloat64Number *) &Mat,
1006 _cmsStageGetPtrToCurveSet(Shaper),
1007 &BlackPointAdaptedToD50);
1008 }
1009 else {
1010
1011 cmsSignalError(m ->ContextID, cmsERROR_COLORSPACE_CHECK, "Profile is not suitable for CSA. Unsupported colorspace.");
1012 return 0;
1013 }
1014
1015 return rc;
1016 }
1017
1018
1019
1020 // Creates a PostScript color list from a named profile data.
1021 // This is a HP extension, and it works in Lab instead of XYZ
1022
1023 static
1024 int WriteNamedColorCSA(cmsIOHANDLER* m, cmsHPROFILE hNamedColor, int Intent)
1025 {
1026 cmsHTRANSFORM xform;
1027 cmsHPROFILE hLab;
1028 int i, nColors;
1029 char ColorName[32];
1030 cmsNAMEDCOLORLIST* NamedColorList;
1031
1032 hLab = cmsCreateLab4ProfileTHR(m ->ContextID, NULL);
1033 xform = cmsCreateTransform(hNamedColor, TYPE_NAMED_COLOR_INDEX, hLab, TYPE_Lab_DBL, Intent, 0);
1034 if (xform == NULL) return 0;
1035
1036 NamedColorList = cmsGetNamedColorList(xform);
1037 if (NamedColorList == NULL) return 0;
1038
1039 _cmsIOPrintf(m, "<<\n");
1040 _cmsIOPrintf(m, "(colorlistcomment) (%s)\n", "Named color CSA");
1041 _cmsIOPrintf(m, "(Prefix) [ (Pantone ) (PANTONE ) ]\n");
1042 _cmsIOPrintf(m, "(Suffix) [ ( CV) ( CVC) ( C) ]\n");
1043
1044 nColors = cmsNamedColorCount(NamedColorList);
1045
1046
1047 for (i=0; i < nColors; i++) {
1048
1049 cmsUInt16Number In[1];
1050 cmsCIELab Lab;
1051
1052 In[0] = (cmsUInt16Number) i;
1053
1054 if (!cmsNamedColorInfo(NamedColorList, i, ColorName, NULL, NULL, NULL, NULL))
1055 continue;
1056
1057 cmsDoTransform(xform, In, &Lab, 1);
1058 _cmsIOPrintf(m, " (%s) [ %.3f %.3f %.3f ]\n", ColorName, Lab.L, Lab.a, Lab.b);
1059 }
1060
1061
1062
1063 _cmsIOPrintf(m, ">>\n");
1064
1065 cmsDeleteTransform(xform);
1066 cmsCloseProfile(hLab);
1067 return 1;
1068 }
1069
1070
1071 // Does create a Color Space Array on XYZ colorspace for PostScript usage
1072 static
1073 cmsUInt32Number GenerateCSA(cmsContext ContextID,
1074 cmsHPROFILE hProfile,
1075 cmsUInt32Number Intent,
1076 cmsUInt32Number dwFlags,
1077 cmsIOHANDLER* mem)
1078 {
1079 cmsUInt32Number dwBytesUsed;
1080 cmsPipeline* lut = NULL;
1081 cmsStage* Matrix, *Shaper;
1082
1083
1084 // Is a named color profile?
1085 if (cmsGetDeviceClass(hProfile) == cmsSigNamedColorClass) {
1086
1087 if (!WriteNamedColorCSA(mem, hProfile, Intent)) goto Error;
1088 }
1089 else {
1090
1091
1092 // Any profile class are allowed (including devicelink), but
1093 // output (PCS) colorspace must be XYZ or Lab
1094 cmsColorSpaceSignature ColorSpace = cmsGetPCS(hProfile);
1095
1096 if (ColorSpace != cmsSigXYZData &&
1097 ColorSpace != cmsSigLabData) {
1098
1099 cmsSignalError(ContextID, cmsERROR_COLORSPACE_CHECK, "Invalid output color space");
1100 goto Error;
1101 }
1102
1103
1104 // Read the lut with all necessary conversion stages
1105 lut = _cmsReadInputLUT(hProfile, Intent);
1106 if (lut == NULL) goto Error;
1107
1108
1109 // Tone curves + matrix can be implemented without any LUT
1110 if (cmsPipelineCheckAndRetreiveStages(lut, 2, cmsSigCurveSetElemType, cmsSigMatrixElemType, &Shaper, &Matrix)) {
1111
1112 if (!WriteInputMatrixShaper(mem, hProfile, Matrix, Shaper)) goto Error;
1113
1114 }
1115 else {
1116 // We need a LUT for the rest
1117 if (!WriteInputLUT(mem, hProfile, Intent, dwFlags)) goto Error;
1118 }
1119 }
1120
1121
1122 // Done, keep memory usage
1123 dwBytesUsed = mem ->UsedSpace;
1124
1125 // Get rid of LUT
1126 if (lut != NULL) cmsPipelineFree(lut);
1127
1128 // Finally, return used byte count
1129 return dwBytesUsed;
1130
1131 Error:
1132 if (lut != NULL) cmsPipelineFree(lut);
1133 return 0;
1134 }
1135
1136 // ------------------------------------------------------ Color Rendering Dictionary (CRD)
1137
1138
1139
1140 /*
1141
1142 Black point compensation plus chromatic adaptation:
1143
1144 Step 1 - Chromatic adaptation
1145 =============================
1146
1147 WPout
1148 X = ------- PQR
1149 Wpin
1150
1151 Step 2 - Black point compensation
1152 =================================
1153
1154 (WPout - BPout)*X - WPout*(BPin - BPout)
1155 out = ---------------------------------------
1156 WPout - BPin
1157
1158
1159 Algorithm discussion
1160 ====================
1161
1162 TransformPQR(WPin, BPin, WPout, BPout, PQR)
1163
1164 Wpin,etc= { Xws Yws Zws Pws Qws Rws }
1165
1166
1167 Algorithm Stack 0...n
1168 ===========================================================
1169 PQR BPout WPout BPin WPin
1170 4 index 3 get WPin PQR BPout WPout BPin WPin
1171 div (PQR/WPin) BPout WPout BPin WPin
1172 2 index 3 get WPout (PQR/WPin) BPout WPout BPin WPin
1173 mult WPout*(PQR/WPin) BPout WPout BPin WPin
1174
1175 2 index 3 get WPout WPout*(PQR/WPin) BPout WPout BPin WPin
1176 2 index 3 get BPout WPout WPout*(PQR/WPin) BPout WPout BPin WPin
1177 sub (WPout-BPout) WPout*(PQR/WPin) BPout WPout BPin WPin
1178 mult (WPout-BPout)* WPout*(PQR/WPin) BPout WPout BPin WPin
1179
1180 2 index 3 get WPout (BPout-WPout)* WPout*(PQR/WPin) BPout WPout BPin WPin
1181 4 index 3 get BPin WPout (BPout-WPout)* WPout*(PQR/WPin) BPout WPout BPin WPin
1182 3 index 3 get BPout BPin WPout (BPout-WPout)* WPout*(PQR/WPin) BPout WPout BPin WPin
1183
1184 sub (BPin-BPout) WPout (BPout-WPout)* WPout*(PQR/WPin) BPout WPout BPin WPin
1185 mult (BPin-BPout)*WPout (BPout-WPout)* WPout*(PQR/WPin) BPout WPout BPin WPin
1186 sub (BPout-WPout)* WPout*(PQR/WPin)-(BPin-BPout)*WPout BPout WPout BPin WPin
1187
1188 3 index 3 get BPin (BPout-WPout)* WPout*(PQR/WPin)-(BPin-BPout)*WPout BPout WPout BPin WPin
1189 3 index 3 get WPout BPin (BPout-WPout)* WPout*(PQR/WPin)-(BPin-BPout)*WPout BPout WPout BPin WPin
1190 exch
1191 sub (WPout-BPin) (BPout-WPout)* WPout*(PQR/WPin)-(BPin-BPout)*WPout BPout WPout BPin WPin
1192 div
1193
1194 exch pop
1195 exch pop
1196 exch pop
1197 exch pop
1198
1199 */
1200
1201
1202 static
1203 void EmitPQRStage(cmsIOHANDLER* m, cmsHPROFILE hProfile, int DoBPC, int lIsAbsolute)
1204 {
1205
1206
1207 if (lIsAbsolute) {
1208
1209 // For absolute colorimetric intent, encode back to relative
1210 // and generate a relative Pipeline
1211
1212 // Relative encoding is obtained across XYZpcs*(D50/WhitePoint)
1213
1214 cmsCIEXYZ White;
1215
1216 _cmsReadMediaWhitePoint(&White, hProfile);
1217
1218 _cmsIOPrintf(m,"/MatrixPQR [1 0 0 0 1 0 0 0 1 ]\n");
1219 _cmsIOPrintf(m,"/RangePQR [ -0.5 2 -0.5 2 -0.5 2 ]\n");
1220
1221 _cmsIOPrintf(m, "%% Absolute colorimetric -- encode to relative to maximize LUT usage\n"
1222 "/TransformPQR [\n"
1223 "{0.9642 mul %g div exch pop exch pop exch pop exch pop} bind\n"
1224 "{1.0000 mul %g div exch pop exch pop exch pop exch pop} bind\n"
1225 "{0.8249 mul %g div exch pop exch pop exch pop exch pop} bind\n]\n",
1226 White.X, White.Y, White.Z);
1227 return;
1228 }
1229
1230
1231 _cmsIOPrintf(m,"%% Bradford Cone Space\n"
1232 "/MatrixPQR [0.8951 -0.7502 0.0389 0.2664 1.7135 -0.0685 -0.1614 0.0367 1.0296 ] \n");
1233
1234 _cmsIOPrintf(m, "/RangePQR [ -0.5 2 -0.5 2 -0.5 2 ]\n");
1235
1236
1237 // No BPC
1238
1239 if (!DoBPC) {
1240
1241 _cmsIOPrintf(m, "%% VonKries-like transform in Bradford Cone Space\n"
1242 "/TransformPQR [\n"
1243 "{exch pop exch 3 get mul exch pop exch 3 get div} bind\n"
1244 "{exch pop exch 4 get mul exch pop exch 4 get div} bind\n"
1245 "{exch pop exch 5 get mul exch pop exch 5 get div} bind\n]\n");
1246 } else {
1247
1248 // BPC
1249
1250 _cmsIOPrintf(m, "%% VonKries-like transform in Bradford Cone Space plus BPC\n"
1251 "/TransformPQR [\n");
1252
1253 _cmsIOPrintf(m, "{4 index 3 get div 2 index 3 get mul "
1254 "2 index 3 get 2 index 3 get sub mul "
1255 "2 index 3 get 4 index 3 get 3 index 3 get sub mul sub "
1256 "3 index 3 get 3 index 3 get exch sub div "
1257 "exch pop exch pop exch pop exch pop } bind\n");
1258
1259 _cmsIOPrintf(m, "{4 index 4 get div 2 index 4 get mul "
1260 "2 index 4 get 2 index 4 get sub mul "
1261 "2 index 4 get 4 index 4 get 3 index 4 get sub mul sub "
1262 "3 index 4 get 3 index 4 get exch sub div "
1263 "exch pop exch pop exch pop exch pop } bind\n");
1264
1265 _cmsIOPrintf(m, "{4 index 5 get div 2 index 5 get mul "
1266 "2 index 5 get 2 index 5 get sub mul "
1267 "2 index 5 get 4 index 5 get 3 index 5 get sub mul sub "
1268 "3 index 5 get 3 index 5 get exch sub div "
1269 "exch pop exch pop exch pop exch pop } bind\n]\n");
1270
1271 }
1272
1273
1274 }
1275
1276
1277 static
1278 void EmitXYZ2Lab(cmsIOHANDLER* m)
1279 {
1280 _cmsIOPrintf(m, "/RangeLMN [ -0.635 2.0 0 2 -0.635 2.0 ]\n");
1281 _cmsIOPrintf(m, "/EncodeLMN [\n");
1282 _cmsIOPrintf(m, "{ 0.964200 div dup 0.008856 le {7.787 mul 16 116 div add}{1 3 div exp} ifelse } bind\n");
1283 _cmsIOPrintf(m, "{ 1.000000 div dup 0.008856 le {7.787 mul 16 116 div add}{1 3 div exp} ifelse } bind\n");
1284 _cmsIOPrintf(m, "{ 0.824900 div dup 0.008856 le {7.787 mul 16 116 div add}{1 3 div exp} ifelse } bind\n");
1285 _cmsIOPrintf(m, "]\n");
1286 _cmsIOPrintf(m, "/MatrixABC [ 0 1 0 1 -1 1 0 0 -1 ]\n");
1287 _cmsIOPrintf(m, "/EncodeABC [\n");
1288
1289
1290 _cmsIOPrintf(m, "{ 116 mul 16 sub 100 div } bind\n");
1291 _cmsIOPrintf(m, "{ 500 mul 128 add 256 div } bind\n");
1292 _cmsIOPrintf(m, "{ 200 mul 128 add 256 div } bind\n");
1293
1294
1295 _cmsIOPrintf(m, "]\n");
1296
1297
1298 }
1299
1300 // Due to impedance mismatch between XYZ and almost all RGB and CMYK spaces
1301 // I choose to dump LUTS in Lab instead of XYZ. There is still a lot of wasted
1302 // space on 3D CLUT, but since space seems not to be a problem here, 33 points
1303 // would give a reasonable accurancy. Note also that CRD tables must operate in
1304 // 8 bits.
1305
1306 static
1307 int WriteOutputLUT(cmsIOHANDLER* m, cmsHPROFILE hProfile, int Intent, cmsUInt32Number dwFlags)
1308 {
1309 cmsHPROFILE hLab;
1310 cmsHTRANSFORM xform;
1311 int i, nChannels;
1312 cmsUInt32Number OutputFormat;
1313 _cmsTRANSFORM* v;
1314 cmsPipeline* DeviceLink;
1315 cmsHPROFILE Profiles[3];
1316 cmsCIEXYZ BlackPointAdaptedToD50;
1317 cmsBool lDoBPC = (dwFlags & cmsFLAGS_BLACKPOINTCOMPENSATION);
1318 cmsBool lFixWhite = !(dwFlags & cmsFLAGS_NOWHITEONWHITEFIXUP);
1319 cmsUInt32Number InFrm = TYPE_Lab_16;
1320 int RelativeEncodingIntent;
1321 cmsColorSpaceSignature ColorSpace;
1322
1323
1324 hLab = cmsCreateLab4ProfileTHR(m ->ContextID, NULL);
1325 if (hLab == NULL) return 0;
1326
1327 OutputFormat = cmsFormatterForColorspaceOfProfile(hProfile, 2, FALSE);
1328 nChannels = T_CHANNELS(OutputFormat);
1329
1330 ColorSpace = cmsGetColorSpace(hProfile);
1331
1332 // For absolute colorimetric, the LUT is encoded as relative in order to preserve precision.
1333
1334 RelativeEncodingIntent = Intent;
1335 if (RelativeEncodingIntent == INTENT_ABSOLUTE_COLORIMETRIC)
1336 RelativeEncodingIntent = INTENT_RELATIVE_COLORIMETRIC;
1337
1338
1339 // Use V4 Lab always
1340 Profiles[0] = hLab;
1341 Profiles[1] = hProfile;
1342
1343 xform = cmsCreateMultiprofileTransformTHR(m ->ContextID,
1344 Profiles, 2, TYPE_Lab_DBL,
1345 OutputFormat, RelativeEncodingIntent, 0);
1346 cmsCloseProfile(hLab);
1347
1348 if (xform == NULL) {
1349
1350 cmsSignalError(m ->ContextID, cmsERROR_COLORSPACE_CHECK, "Cannot create transform Lab -> Profile in CRD creation");
1351 return 0;
1352 }
1353
1354 // Get a copy of the internal devicelink
1355 v = (_cmsTRANSFORM*) xform;
1356 DeviceLink = cmsPipelineDup(v ->Lut);
1357 if (DeviceLink == NULL) return 0;
1358
1359
1360 // We need a CLUT
1361 dwFlags |= cmsFLAGS_FORCE_CLUT;
1362 _cmsOptimizePipeline(m->ContextID, &DeviceLink, RelativeEncodingIntent, &InFrm, &OutputFormat, &dwFlags);
1363
1364 _cmsIOPrintf(m, "<<\n");
1365 _cmsIOPrintf(m, "/ColorRenderingType 1\n");
1366
1367
1368 cmsDetectBlackPoint(&BlackPointAdaptedToD50, hProfile, Intent, 0);
1369
1370 // Emit headers, etc.
1371 EmitWhiteBlackD50(m, &BlackPointAdaptedToD50);
1372 EmitPQRStage(m, hProfile, lDoBPC, Intent == INTENT_ABSOLUTE_COLORIMETRIC);
1373 EmitXYZ2Lab(m);
1374
1375
1376 // FIXUP: map Lab (100, 0, 0) to perfect white, because the particular encoding for Lab
1377 // does map a=b=0 not falling into any specific node. Since range a,b goes -128..127,
1378 // zero is slightly moved towards right, so assure next node (in L=100 slice) is mapped to
1379 // zero. This would sacrifice a bit of highlights, but failure to do so would cause
1380 // scum dot. Ouch.
1381
1382 if (Intent == INTENT_ABSOLUTE_COLORIMETRIC)
1383 lFixWhite = FALSE;
1384
1385 _cmsIOPrintf(m, "/RenderTable ");
1386
1387
1388 WriteCLUT(m, cmsPipelineGetPtrToFirstStage(DeviceLink), "<", ">\n", "", "", lFixWhite, ColorSpace);
1389
1390 _cmsIOPrintf(m, " %d {} bind ", nChannels);
1391
1392 for (i=1; i < nChannels; i++)
1393 _cmsIOPrintf(m, "dup ");
1394
1395 _cmsIOPrintf(m, "]\n");
1396
1397
1398 EmitIntent(m, Intent);
1399
1400 _cmsIOPrintf(m, ">>\n");
1401
1402 if (!(dwFlags & cmsFLAGS_NODEFAULTRESOURCEDEF)) {
1403
1404 _cmsIOPrintf(m, "/Current exch /ColorRendering defineresource pop\n");
1405 }
1406
1407 cmsPipelineFree(DeviceLink);
1408 cmsDeleteTransform(xform);
1409
1410 return 1;
1411 }
1412
1413
1414 // Builds a ASCII string containing colorant list in 0..1.0 range
1415 static
1416 void BuildColorantList(char *Colorant, int nColorant, cmsUInt16Number Out[])
1417 {
1418 char Buff[32];
1419 int j;
1420
1421 Colorant[0] = 0;
1422 if (nColorant > cmsMAXCHANNELS)
1423 nColorant = cmsMAXCHANNELS;
1424
1425 for (j=0; j < nColorant; j++) {
1426
1427 sprintf(Buff, "%.3f", Out[j] / 65535.0);
1428 strcat(Colorant, Buff);
1429 if (j < nColorant -1)
1430 strcat(Colorant, " ");
1431
1432 }
1433 }
1434
1435
1436 // Creates a PostScript color list from a named profile data.
1437 // This is a HP extension.
1438
1439 static
1440 int WriteNamedColorCRD(cmsIOHANDLER* m, cmsHPROFILE hNamedColor, int Intent, cmsUInt32Number dwFlags)
1441 {
1442 cmsHTRANSFORM xform;
1443 int i, nColors, nColorant;
1444 cmsUInt32Number OutputFormat;
1445 char ColorName[32];
1446 char Colorant[128];
1447 cmsNAMEDCOLORLIST* NamedColorList;
1448
1449
1450 OutputFormat = cmsFormatterForColorspaceOfProfile(hNamedColor, 2, FALSE);
1451 nColorant = T_CHANNELS(OutputFormat);
1452
1453
1454 xform = cmsCreateTransform(hNamedColor, TYPE_NAMED_COLOR_INDEX, NULL, OutputFormat, Intent, dwFlags);
1455 if (xform == NULL) return 0;
1456
1457
1458 NamedColorList = cmsGetNamedColorList(xform);
1459 if (NamedColorList == NULL) return 0;
1460
1461 _cmsIOPrintf(m, "<<\n");
1462 _cmsIOPrintf(m, "(colorlistcomment) (%s) \n", "Named profile");
1463 _cmsIOPrintf(m, "(Prefix) [ (Pantone ) (PANTONE ) ]\n");
1464 _cmsIOPrintf(m, "(Suffix) [ ( CV) ( CVC) ( C) ]\n");
1465
1466 nColors = cmsNamedColorCount(NamedColorList);
1467
1468 for (i=0; i < nColors; i++) {
1469
1470 cmsUInt16Number In[1];
1471 cmsUInt16Number Out[cmsMAXCHANNELS];
1472
1473 In[0] = (cmsUInt16Number) i;
1474
1475 if (!cmsNamedColorInfo(NamedColorList, i, ColorName, NULL, NULL, NULL, NULL))
1476 continue;
1477
1478 cmsDoTransform(xform, In, Out, 1);
1479 BuildColorantList(Colorant, nColorant, Out);
1480 _cmsIOPrintf(m, " (%s) [ %s ]\n", ColorName, Colorant);
1481 }
1482
1483 _cmsIOPrintf(m, " >>");
1484
1485 if (!(dwFlags & cmsFLAGS_NODEFAULTRESOURCEDEF)) {
1486
1487 _cmsIOPrintf(m, " /Current exch /HPSpotTable defineresource pop\n");
1488 }
1489
1490 cmsDeleteTransform(xform);
1491 return 1;
1492 }
1493
1494
1495
1496 // This one does create a Color Rendering Dictionary.
1497 // CRD are always LUT-Based, no matter if profile is
1498 // implemented as matrix-shaper.
1499
1500 static
1501 cmsUInt32Number GenerateCRD(cmsContext ContextID,
1502 cmsHPROFILE hProfile,
1503 cmsUInt32Number Intent, cmsUInt32Number dwFlags,
1504 cmsIOHANDLER* mem)
1505 {
1506 cmsUInt32Number dwBytesUsed;
1507
1508 if (!(dwFlags & cmsFLAGS_NODEFAULTRESOURCEDEF)) {
1509
1510 EmitHeader(mem, "Color Rendering Dictionary (CRD)", hProfile);
1511 }
1512
1513
1514 // Is a named color profile?
1515 if (cmsGetDeviceClass(hProfile) == cmsSigNamedColorClass) {
1516
1517 if (!WriteNamedColorCRD(mem, hProfile, Intent, dwFlags)) {
1518 return 0;
1519 }
1520 }
1521 else {
1522
1523 // CRD are always implemented as LUT
1524
1525 if (!WriteOutputLUT(mem, hProfile, Intent, dwFlags)) {
1526 return 0;
1527 }
1528 }
1529
1530 if (!(dwFlags & cmsFLAGS_NODEFAULTRESOURCEDEF)) {
1531
1532 _cmsIOPrintf(mem, "%%%%EndResource\n");
1533 _cmsIOPrintf(mem, "\n%% CRD End\n");
1534 }
1535
1536 // Done, keep memory usage
1537 dwBytesUsed = mem ->UsedSpace;
1538
1539 cmsUNUSED_PARAMETER(ContextID);
1540
1541 // Finally, return used byte count
1542 return dwBytesUsed;
1543
1544 }
1545
1546
1547
1548
1549 cmsUInt32Number CMSEXPORT cmsGetPostScriptColorResource(cmsContext ContextID,
1550 cmsPSResourceType Type,
1551 cmsHPROFILE hProfile,
1552 cmsUInt32Number Intent,
1553 cmsUInt32Number dwFlags,
1554 cmsIOHANDLER* io)
1555 {
1556 cmsUInt32Number rc;
1557
1558
1559 switch (Type) {
1560
1561 case cmsPS_RESOURCE_CSA:
1562 rc = GenerateCSA(ContextID, hProfile, Intent, dwFlags, io);
1563 break;
1564
1565 default:
1566 case cmsPS_RESOURCE_CRD:
1567 rc = GenerateCRD(ContextID, hProfile, Intent, dwFlags, io);
1568 break;
1569 }
1570
1571 return rc;
1572 }
1573
1574
1575
1576 cmsUInt32Number CMSEXPORT cmsGetPostScriptCRD(cmsContext ContextID,
1577 cmsHPROFILE hProfile,
1578 cmsUInt32Number Intent, cmsUInt32Number dwFlags,
1579 void* Buffer, cmsUInt32Number dwBufferLen)
1580 {
1581 cmsIOHANDLER* mem;
1582 cmsUInt32Number dwBytesUsed;
1583
1584 // Set up the serialization engine
1585 if (Buffer == NULL)
1586 mem = cmsOpenIOhandlerFromNULL(ContextID);
1587 else
1588 mem = cmsOpenIOhandlerFromMem(ContextID, Buffer, dwBufferLen, "w");
1589
1590 if (!mem) return 0;
1591
1592 dwBytesUsed = cmsGetPostScriptColorResource(ContextID, cmsPS_RESOURCE_CRD, hProfile, Intent, dwFlags, mem);
1593
1594 // Get rid of memory stream
1595 cmsCloseIOhandler(mem);
1596
1597 return dwBytesUsed;
1598 }
1599
1600
1601
1602 // Does create a Color Space Array on XYZ colorspace for PostScript usage
1603 cmsUInt32Number CMSEXPORT cmsGetPostScriptCSA(cmsContext ContextID,
1604 cmsHPROFILE hProfile,
1605 cmsUInt32Number Intent,
1606 cmsUInt32Number dwFlags,
1607 void* Buffer,
1608 cmsUInt32Number dwBufferLen)
1609 {
1610 cmsIOHANDLER* mem;
1611 cmsUInt32Number dwBytesUsed;
1612
1613 if (Buffer == NULL)
1614 mem = cmsOpenIOhandlerFromNULL(ContextID);
1615 else
1616 mem = cmsOpenIOhandlerFromMem(ContextID, Buffer, dwBufferLen, "w");
1617
1618 if (!mem) return 0;
1619
1620 dwBytesUsed = cmsGetPostScriptColorResource(ContextID, cmsPS_RESOURCE_CSA, hProfile, Intent, dwFlags, mem);
1621
1622 // Get rid of memory stream
1623 cmsCloseIOhandler(mem);
1624
1625 return dwBytesUsed;
1626
1627 }