summaryrefslogtreecommitdiff
path: root/Xprint/pcl/PclColor.c
blob: 8a9eef148a10ffa8825a2d989292609fe6f618c5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
/* $Xorg: PclColor.c,v 1.3 2000/08/17 19:48:07 cpqbld Exp $ */
/*******************************************************************
**
**    *********************************************************
**    *
**    *  File:		PclColorInit.c
**    *
**    *  Contents:
**    *                 Colormap handing code of Pcl driver for the 
**    *                 print server.
**    *
**    *  Created:	4/8/96
**    *
**    *********************************************************
** 
********************************************************************/
/*
(c) Copyright 1996 Hewlett-Packard Company
(c) Copyright 1996 International Business Machines Corp.
(c) Copyright 1996 Sun Microsystems, Inc.
(c) Copyright 1996 Novell, Inc.
(c) Copyright 1996 Digital Equipment Corp.
(c) Copyright 1996 Fujitsu Limited
(c) Copyright 1996 Hitachi, Ltd.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the names of the copyright holders shall
not be used in advertising or otherwise to promote the sale, use or other
dealings in this Software without prior written authorization from said
copyright holders.
*/
/* $XFree86$ */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <math.h>

#include "colormapst.h"
#include "windowstr.h"
#include "resource.h"

#include "Pcl.h"
#include "cfb.h"

static void lookup(unsigned char *src,
		unsigned char *dst,
		int num,
		unsigned char *map,
		int dim);
static void trilinear(unsigned char *p,
		unsigned char *out,
		unsigned char *d,
		int dim,
		unsigned char def);


/*
 * This seems to be (and is) a duplication of effort; one would think
 * that cfbCreateDefColormap would be sufficient.  It almost is.  The
 * only change made in this function is that the black and white pixels
 * are allocated with three separate variables for red, green and blue
 * values, instead of the single variable in cfbCreateDefColormap.  The
 * single variable leads to the one value being corrected by
 * ResolveColor three times, which leads to incorrect colors.
 */

Bool
PclCreateDefColormap(ScreenPtr pScreen)
{
    unsigned short wp_red = ~0, wp_green = ~0, wp_blue = ~0;
    unsigned short bp_red = 0, bp_green = 0, bp_blue = 0;
    VisualPtr	pVisual;
    ColormapPtr	cmap;
    Pixel wp, bp;
    
    for (pVisual = pScreen->visuals;
	 pVisual->vid != pScreen->rootVisual;
	 pVisual++)
	;

    if (CreateColormap(pScreen->defColormap, pScreen, pVisual, &cmap,
		       (pVisual->class & DynamicClass) ? AllocNone : AllocAll,
		       0)
	!= Success)
	return FALSE;
    wp = pScreen->whitePixel;
    bp = pScreen->blackPixel;
    if ((AllocColor(cmap, &wp_red, &wp_green, &wp_blue, &wp, 0) !=
       	   Success) ||
    	(AllocColor(cmap, &bp_red, &bp_green, &bp_blue, &bp, 0) !=
       	   Success))
    	return FALSE;

	pScreen->whitePixel = wp;
	pScreen->blackPixel = bp;
    
    (*pScreen->InstallColormap)(cmap);
    return TRUE;
}

/*
 * Add colormap to list of colormaps on screen
 */
Bool
PclCreateColormap(ColormapPtr pColor)
{
    PclCmapToContexts *new;
    PclScreenPrivPtr sPriv;

    sPriv = (PclScreenPrivPtr)pColor->pScreen
      ->devPrivates[PclScreenPrivateIndex].ptr;

	/*
	 * Use existing code to initialize the values in the colormap
	 */
	cfbInitializeColormap( pColor );

	/*
	 * Set up the mapping between the color map and the context
	 */
    new = (PclCmapToContexts *)xalloc( sizeof( PclCmapToContexts ) );

    if( new )
      {
	  new->colormapId = pColor->mid;
	  new->contexts = NULL;
	  new->next = sPriv->colormaps;
	  sPriv->colormaps = new;
	  
	  return TRUE;
      }
    else
      return FALSE;
}

void
PclDestroyColormap(ColormapPtr pColor)
{
    PclScreenPrivPtr sPriv;
    PclCmapToContexts *pCmap, *tCmap = 0;
    PclContextListPtr con, tCon;
    PclContextPrivPtr cPriv;
    PclPaletteMapPtr pPal;
    char t[80];

    /*
     * At DestroyContext time, colormaps may be destroyed twice, so if the
     * pointer is NULL, just crash out.
     */
    if( !pColor )
      return;
    
    /*
     * Find the colormap <-> contexts mapping 
     */
    sPriv = (PclScreenPrivPtr)pColor->pScreen
      ->devPrivates[PclScreenPrivateIndex].ptr;
    pCmap = sPriv->colormaps;
    while( pCmap )
      {
	  if( pCmap->colormapId == pColor->mid )
	    break;
	  tCmap = pCmap;
	  pCmap = pCmap->next;
      }

    /*
     * For each context, delete the palette in the printer and
     * free the mapping.
     */
    if( pCmap )
      {
	  con = pCmap->contexts;
	  while( con )
	    {
		cPriv = con->context->devPrivates[PclContextPrivateIndex].ptr;

		pPal = cPriv->palettes;
		while( pPal )
		  {
		      if( pPal->colormapId == pColor->mid )
			break;
		      pPal = pPal->next;
		  }
		
		if( cPriv->pPageFile )
		  {
		      sprintf( t, "\033&p%dI\033*p2C", pPal->paletteId );
		      SEND_PCL( cPriv->pPageFile, t );
		  }
		
		tCon = con;
		con = con->next;
		xfree( tCon );
	    }
	  
	  /*
	   * Delete the colormap<->contexts mapping
	   */
	  if( sPriv->colormaps == pCmap )
	    /* Delete from the front */
	    sPriv->colormaps = pCmap->next;
	  else
	    /* Delete from the middle */
	    tCmap->next = pCmap->next;
	  free( pCmap );
      }
}

void
PclInstallColormap(ColormapPtr pColor)
{
}

void
PclUninstallColormap(ColormapPtr pColor)
{
}

int
PclListInstalledColormaps(ScreenPtr pScreen,
			  XID *pCmapList)
{
    return 0;
}

void
PclStoreColors(ColormapPtr pColor,
	       int ndef,
	       xColorItem *pdefs)
{
    PclCmapToContexts *p;
    PclScreenPrivPtr sPriv;
    PclContextListPtr con;
    PclContextPrivPtr cPriv;
    PclPaletteMapPtr pMap;
    char t[80];
    int i;

    sPriv = (PclScreenPrivPtr)pColor->pScreen
      ->devPrivates[PclScreenPrivateIndex].ptr;
    p = sPriv->colormaps;
    while( p )
      {
	  if( p->colormapId == pColor->mid )
	    break;
	  p = p->next;
      }

    if( p )
      {
	  con = p->contexts;
	  while( con )
	    {
		/*
		 * For each context, get the palette ID and update the
		 * appropriate palette.
		 */
		cPriv = con->context
		  ->devPrivates[PclContextPrivateIndex].ptr;
		pMap = PclFindPaletteMap( cPriv, pColor, NULL );

		/*
		 * Update the palette
		 */
		sprintf( t, "\033&p%dS", pMap->paletteId );
		SEND_PCL( cPriv->pPageFile, t );
		
		if( pColor->class == PseudoColor )
		  {
		      unsigned short r, g, b;
		      unsigned int pID;
		      for( i = 0; i < ndef; i++ )
			{
			    pID = pdefs[i].pixel;
			    if ( pColor->red[i].fShared )
			      {
				  r = pColor->red[pID].co.shco.red->color;
				  g = pColor->red[pID].co.shco.green->color;
				  b = pColor->red[pID].co.shco.blue->color;
			      }
			    else
			      {
				  r = pColor->red[pID].co.local.red;
				  g = pColor->red[pID].co.local.green;
				  b = pColor->red[pID].co.local.blue;
			      }

			    if( pdefs[i].flags & DoRed )
				  r = pdefs[i].red;
			    if( pdefs[i].flags & DoGreen )
				  g = pdefs[i].green;
			    if( pdefs[i].flags & DoBlue )
				  b = pdefs[i].blue;
			    PclLookUp(pColor, cPriv, &r, &g, &b);
			    sprintf( t, "\033*v%ua%ub%uc%dI", r, g, b, pID);
			    SEND_PCL( cPriv->pPageFile, t );
			}
		  }    

		sprintf( t, "\033&p%dS", cPriv->currentPalette );
		SEND_PCL( cPriv->pPageFile, t );

		con = con->next;
	    }
      }
}

void
PclResolveColor(unsigned short *pRed,
		unsigned short *pGreen,
		unsigned short *pBlue,
		VisualPtr pVisual)
{
    /*
     * We need to map the X color range of [0,65535] to the PCL color
     * range of [0,32767].
     */
    *pRed >>= 1;
    *pGreen >>= 1;
    *pBlue >>= 1;
}

PclPaletteMapPtr
PclFindPaletteMap(PclContextPrivPtr cPriv,
		  ColormapPtr cmap,
		  GCPtr gc)
{
    PclPaletteMapPtr p = cPriv->palettes, new;

    /*
     * If the colormap is static, grab one of the special palettes.  If we come
     * into this from StoreColors, there will be no GC, but by definition we're
     * looking at a dynamic color map, so the special colors will not be
     * needed.
     */
    if( gc )
      {
	  if( cmap->pVisual->class == StaticGray )
	    return &( cPriv->staticGrayPalette );
	  else if( cmap->pVisual->class == TrueColor )
	    {
		if( gc->fillStyle == FillTiled && !( gc->tileIsPixel ) )
		  return &( cPriv->specialTrueColorPalette );
		else
		  return &( cPriv->trueColorPalette );
	    }
      }
    
    
    /* Look for the colormap ID <-> palette ID mapping */
    while( p )
      {
	  if( p->colormapId == cmap->mid )
	    return p;
	  p = p->next;
      }

    /* If the colormap isn't already there, make an entry for it */
    new = (PclPaletteMapPtr)xalloc( sizeof( PclPaletteMap ) );
    new->colormapId = cmap->mid;
    new->paletteId = cPriv->nextPaletteId++;
    new->downloaded = 0;
    new->next = cPriv->palettes;
    cPriv->palettes = new;
    return new;
}

int
PclUpdateColormap(DrawablePtr pDrawable,
		  XpContextPtr pCon,
		  GCPtr gc,
		  FILE *outFile)
{
    PclScreenPrivPtr sPriv;
    
    PclContextPrivPtr cPriv;
    PclPaletteMapPtr pMap;
    PclCmapToContexts *pCmap;
    PclContextListPtr new;
    char t[80];
    Colormap c;
    ColormapPtr cmap;
    WindowPtr win = (WindowPtr)pDrawable;
    unsigned short r, g, b, rr, gg, bb;
    int i;

    cPriv = pCon->devPrivates[PclContextPrivateIndex].ptr;
    
    c = wColormap( win );
    cmap = (ColormapPtr)LookupIDByType( c, RT_COLORMAP );
    pMap = PclFindPaletteMap( cPriv, cmap, gc );
    
    if( cPriv->currentPalette == pMap->paletteId )
      /*
       * If the requested colormap is already active, nothing needs to
       * be done.
       */
      return FALSE;

    /*
     * Now we activate the palette in the printer
     */
    sprintf( t, "\033&p%dS", pMap->paletteId );
    SEND_PCL( outFile, t );
    cPriv->currentPalette = pMap->paletteId;

    if( pMap->downloaded == 0 )
      /*
       * If the requested colormap has not been downloaded to the
       * printer, we need to do that before activating it.
       */
      {
	  /*
	   * Add the colormap to the screen-level colormap<->context mapping.
	   */
	  sPriv = (PclScreenPrivPtr)cmap->pScreen
	    ->devPrivates[PclScreenPrivateIndex].ptr;
	  pCmap = sPriv->colormaps;
	  while( pCmap && ( pCmap->colormapId != cmap->mid ) )
		pCmap = pCmap->next;
	  new = (PclContextListPtr)xalloc( sizeof( PclContextList ) );
	  new->context = pCon;
	  new->next = pCmap->contexts;
	  pCmap->contexts = new;

	  /*
	   * XXX Download the colormap
	   */
	  if( cmap->class == StaticGray )
	    {
#ifdef XP_PCL_COLOR
		sprintf( t, "\033*v18W%c%c%c%c%c%c", 0, 1, 1, 1, 1, 1 );
		SEND_PCL_COUNT( cPriv->pPageFile, t, 12 );
		
		/* Send the white reference point... */
		sprintf( t, "%c%c%c%c%c%c", 0x7f, 0xff, 0x7f, 0xff,
			0x7f, 0xff );
		SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );

		/* ... and the black reference point */
		sprintf( t, "%c%c%c%c%c%c", 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00 );
		SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );
		
		/* Now program the two colors */
		sprintf( t, "\033*v0a0b0c%ldI", (long) cmap->pScreen->blackPixel );
		SEND_PCL( cPriv->pPageFile, t );
		sprintf( t, "\033*v32767a32767b32767c%ldI",
			(long) cmap->pScreen->whitePixel );
		SEND_PCL( cPriv->pPageFile, t );
#endif /* XP_PCL_COLOR */
	    }
	  else if( cmap->class == PseudoColor )
	    {
		sprintf( t,
			"\033*v18W%c%c%c%c%c%c",
			0, 1, cmap->pVisual->nplanes, 16, 16, 16 );
		SEND_PCL_COUNT( cPriv->pPageFile, t, 12 );
		
		/* Send the white reference point... */
		if ( cPriv->ctbl != NULL )
		    sprintf( t, "%c%c%c%c%c%c", 0x00, 0xff, 0x00, 0xff,
			0x00, 0xff );
		else
		    sprintf( t, "%c%c%c%c%c%c", 0x7f, 0xff, 0x7f, 0xff,
			0x7f, 0xff );
		SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );

		/* ... and the black reference point */
		sprintf( t, "%c%c%c%c%c%c", 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00 );
		SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );
		
		for(i = 0; i < cmap->pVisual->ColormapEntries; i++ )
		  {
		      if( cmap->red[i].fShared )
			{
			    r = cmap->red[i].co.shco.red->color;
			    g = cmap->red[i].co.shco.green->color;
			    b = cmap->red[i].co.shco.blue->color;
			}
		      else
			{
			    r = cmap->red[i].co.local.red;
			    g = cmap->red[i].co.local.green;
			    b = cmap->red[i].co.local.blue;
			}
		      PclLookUp(cmap, cPriv, &r, &g, &b);
		      sprintf( t, "\033*v%ua%ub%uc%dI", r, g, b, i );
		      SEND_PCL( outFile, t );
		  }
	    }
	  else if( cmap->class == TrueColor )
	    {
		unsigned short lim;

		if( gc->fillStyle == FillTiled && !( gc->tileIsPixel ) )
		  {
		      if( cPriv->ctbl != NULL )
			{
			   /* Send the "special" colormap for 24-bit fills */
			   sprintf( t, "\033*v18W%c%c%c%c%c%c", 0, 1, 
					8,
					cmap->pVisual->bitsPerRGBValue,
					cmap->pVisual->bitsPerRGBValue,
					cmap->pVisual->bitsPerRGBValue );
			   SEND_PCL_COUNT( cPriv->pPageFile, t, 12 );

			   /* Send the white reference point... */
			   sprintf( t, "%c%c%c%c%c%c",
					0x00, 0xff,
					0x00, 0xff,
					0x00, 0xff );
			   SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );

			   /* ... and the black reference point */
			   sprintf( t, "%c%c%c%c%c%c",
					0x00, 0x00,
					0x00, 0x00,
					0x00, 0x00 );
			   SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );

			   /* Now send the color entries, RRRGGGBB */
			   i=0;
			   for( r = 0; r < 8; r++ )
			     for( g = 0; g < 8; g ++ )
			       for( b = 0; b < 4; b++ )
				  {
				      rr = (r * 0xff)/7;
				      gg = (g * 0xff)/7;
				      bb = (b * 0xff)/3;
				      PclLookUp(cmap, cPriv, &rr, &gg, &bb);
				      sprintf( t, "\033*v%ua%ub%uc%dI",
								rr, gg, bb, i );
				      SEND_PCL( outFile, t );
				      i++;
				   }
			}
		      else
			{
			   /* Send the "special" colormap for 24-bit fills */
			   sprintf( t, "\033*v18W%c%c%c%c%c%c", 0, 1, 
				8,
				cmap->pVisual->bitsPerRGBValue,
				cmap->pVisual->bitsPerRGBValue,
				cmap->pVisual->bitsPerRGBValue );
			   SEND_PCL_COUNT( cPriv->pPageFile, t, 12 );

			   /* Send the white reference point... */
			   sprintf( t, "%c%c%c%c%c%c",
					0x00, 0x07,
					0x00, 0x07,
					0x00, 0x03 );
			   SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );

			   /* ... and the black reference point */
			   sprintf( t, "%c%c%c%c%c%c",
					0x00, 0x00,
					0x00, 0x00,
					0x00, 0x00 );
			   SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );

			   /* Now send the color entries, RRRGGGBB */
			   i=0;
			   for( r = 0; r < 8; r++ )
			     for( g = 0; g < 8; g ++ )
			       for( b = 0; b < 4; b++ )
				  {
				      sprintf( t, "\033*v%ua%ub%uc%dI",
								r, g, b, i );
				      SEND_PCL( outFile, t );
				      i++;
				   }
			}

		  }
		else
		  {
		      lim = (1 << cmap->pVisual->bitsPerRGBValue) - 1;

		      /* Send the "special" colormap for 24-bit fills */
		      sprintf( t, "\033*v18W%c%c%c%c%c%c", 0, 3, 
				cmap->pVisual->nplanes,
				cmap->pVisual->bitsPerRGBValue,
				cmap->pVisual->bitsPerRGBValue,
				cmap->pVisual->bitsPerRGBValue );
		      SEND_PCL_COUNT( cPriv->pPageFile, t, 12 );
		     
		      /* Send the white reference point... */
		      sprintf( t, "%c%c%c%c%c%c",
				(lim >> 8) & 0xff, lim & 0xff,
				(lim >> 8) & 0xff, lim & 0xff,
				(lim >> 8) & 0xff, lim & 0xff);
		      SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );

		      /* ... and the black reference point */
		      sprintf( t, "%c%c%c%c%c%c", 0x00, 0x00, 0x00, 0x00,
			      0x00, 0x00 );
		      SEND_PCL_COUNT( cPriv->pPageFile, t, 6 );
		  }

	    }
	  pMap->downloaded = 1;
      }
      return TRUE;
    
}    

void PclLookUp(
    ColormapPtr cmap,
    PclContextPrivPtr cPriv,
    unsigned short *r, 
    unsigned short *g, 
    unsigned short *b
)
{
    unsigned char cdata[3];

    if( cmap->class == PseudoColor )
      {
	if( cPriv->ctbl != NULL )
	  {
	    cdata[0] = *r >> 8;
	    cdata[1] = *g >> 8;
	    cdata[2] = *b >> 8;
	    lookup(cdata, cdata, 1, cPriv->ctbl, cPriv->ctbldim);
	    *r = cdata[0];
	    *g = cdata[1];
	    *b = cdata[2];
	  }
	else
	  {
	    *r >>= 1;
	    *g >>= 1;
	    *b >>= 1;
	  }
      }
    else if( cmap->class == TrueColor )
      {
	if( cPriv->ctbl != NULL )
	  {
	    cdata[0] = *r;
	    cdata[1] = *g;
	    cdata[2] = *b;
	    lookup(cdata, cdata, 1, cPriv->ctbl, cPriv->ctbldim);
	    *r = cdata[0];
	    *g = cdata[1];
	    *b = cdata[2];
	  }
      }
    return;
}

unsigned char *PclReadMap(char *name, int *dim)
{
    FILE *fp;
    unsigned char *data;
    long size;

    if ((fp=fopen(name, "r")) == NULL) {
	return(NULL);
    }

    fseek(fp, 0, SEEK_END);
    size = ftell(fp);
    
    /* Could do this with a lookup table, if the constraint is that the
       3 map dimensions must be equal. */
    switch (size) {
    case 8*8*8*3:
	*dim = 8;
	break;
    case 16*16*16*3:
	*dim = 16;
	break;
    case 17*17*17*3:
	*dim = 17;
	break;
    case 65*65*65*3:
	*dim = 65;
	break;
    default:
	fclose(fp);
	return(NULL);
    }
    
    if ((data = (unsigned char *) xalloc(sizeof(char) * size)) == NULL) {
	fclose(fp);
	return(NULL);
    }

    fseek(fp, 0, SEEK_SET);

    if (fread(data, sizeof(char), size, fp) != (unsigned) size) {
	fclose(fp);
	free(data);
	return(NULL);
    }

    fclose(fp);
    return(data);
}

/************************************************************************
 *
 * Here is the mapper.
 *
 ************************************************************************/

#define SCL(x) ((x)*(dim-1)/255)
/* Interleaved-map lookup */
static void lookup(unsigned char *src, unsigned char *dst, int num, unsigned char *map, int dim)
{
    int i;

#define _INTERPOLATE
#ifndef _INTERPOLATE
    unsigned char *p1, *p2, *p3;

    for (i=0; i<num; i++) {
	p1 = map + (SCL(src[0])*dim*dim + SCL(src[1])*dim + SCL(src[2])) * 3;
	*dst++ = *p1++;
	*dst++ = *p1++;
	*dst++ = *p1++;
	src += 3;
    }
#else
    for (i=0; i<num; i++) {
	trilinear(src, dst, map, dim, 128);
	src += 3;
	dst += 3;
    }
#endif
}

/*
 * C code from the article
 * "Tri-linear Interpolation"
 * by Steve Hill, sah@ukc.ac.uk
 * in "Graphics Gems IV", Academic Press, 1994
 *
 * Fri Feb 16 14:12:43 PST 1996
 *	Modified to use for 8-bit color mapping -- A. Fitzhugh, 
 * 	HP Labs, Printing Technology Department
 */

/* linear interpolation from l (when a=0) to h (when a=1)*/
/* (equal to (a*h)+((1-a)*l) */
#define LERP(a,l,h)	((l)+((((h)-(l))*(a))>>8))

static void trilinear(unsigned char *p, unsigned char *out, unsigned char *d, int dim, unsigned char def)
{
#define DENS(X, Y, Z, ch) d[((X*dim+Y)*dim+Z)*3+ch]
    
    int	x0, y0, z0, 
	x1, y1, z1,
	i;
    unsigned char *dp,
	fx, fy, fz,
	d000, d001, d010, d011,
	d100, d101, d110, d111,
	dx00, dx01, dx10, dx11,
	dxy0, dxy1;
    float scale;
    
    scale = 255.0 / (dim-1);

    x0 = p[0] / scale;
    y0 = p[1] / scale;
    z0 = p[2] / scale;

    /* Fractions should range from 0-1.0 (fixed point 8-256) */
    fx = (((int) (p[0] - x0 * scale)) << 8) / 255;
    fy = (((int) (p[1] - y0 * scale)) << 8) / 255;
    fz = (((int) (p[2] - z0 * scale)) << 8) / 255;
    
    x1 = x0 + 1;
    y1 = y0 + 1;
    z1 = z0 + 1;
    
    for (i=0; i<3; i++) {
	
	if (x0 >= 0 && x1 < dim &&
	    y0 >= 0 && y1 < dim &&
	    z0 >= 0 && z1 < dim) {
	    dp = &DENS(x0, y0, z0, i);
	    d000 = dp[0];
	    d100 = dp[3];
	    dp += dim*3;
	    d010 = dp[0];
	    d110 = dp[3];
	    dp += dim*dim*3;
	    d011 = dp[0];
	    d111 = dp[3];
	    dp -= dim*3;
	    d001 = dp[0];
	    d101 = dp[3];
	} else {
#	define INRANGE(X, Y, Z) \
	    ((X) >= 0 && (X) < dim && \
	     (Y) >= 0 && (Y) < dim && \
	     (Z) >= 0 && (Z) < dim)
	    
	    d000 = INRANGE(x0, y0, z0) ? DENS(x0, y0, z0, i) : def;
	    d001 = INRANGE(x0, y0, z1) ? DENS(x0, y0, z1, i) : def;
	    d010 = INRANGE(x0, y1, z0) ? DENS(x0, y1, z0, i) : def;
	    d011 = INRANGE(x0, y1, z1) ? DENS(x0, y1, z1, i) : def;
	    
	    d100 = INRANGE(x1, y0, z0) ? DENS(x1, y0, z0, i) : def;
	    d101 = INRANGE(x1, y0, z1) ? DENS(x1, y0, z1, i) : def;
	    d110 = INRANGE(x1, y1, z0) ? DENS(x1, y1, z0, i) : def;
	    d111 = INRANGE(x1, y1, z1) ? DENS(x1, y1, z1, i) : def;
	}
	
	dx00 = LERP(fx, d000, d100);
	dx01 = LERP(fx, d001, d101);
	dx10 = LERP(fx, d010, d110);
	dx11 = LERP(fx, d011, d111);
	
	dxy0 = LERP(fy, dx00, dx10);
	dxy1 = LERP(fy, dx01, dx11);
	
	out[i] = LERP(fz, dxy0, dxy1);
    }
}