summaryrefslogtreecommitdiffstats
path: root/generic/tkColor.c
blob: 76d0baa1ab698dde7d82cc8251f2545685843afd (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
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
/*
 * tkColor.c --
 *
 *	This file maintains a database of color values for the Tk toolkit, in
 *	order to avoid round-trips to the server to map color names to pixel
 *	values.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tkInt.h"
#include "tkColor.h"

/*
 * Structures of the following following type are used as keys for
 * colorValueTable (in TkDisplay).
 */

typedef struct {
    int red, green, blue;	/* Values for desired color. */
    Colormap colormap;		/* Colormap from which color will be
				 * allocated. */
    Display *display;		/* Display for colormap. */
} ValueKey;

/*
 * The structure below is used to allocate thread-local data.
 */

typedef struct ThreadSpecificData {
    char rgbString[20];		/* */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/*
 * Forward declarations for functions defined in this file:
 */

static void		ColorInit(TkDisplay *dispPtr);
static void		DupColorObjProc(Tcl_Obj *srcObjPtr,Tcl_Obj *dupObjPtr);
static void		FreeColorObjProc(Tcl_Obj *objPtr);
static void		InitColorObj(Tcl_Obj *objPtr);

/*
 * The following structure defines the implementation of the "color" Tcl
 * object, which maps a string color name to a TkColor object. The ptr1 field
 * of the Tcl_Obj points to a TkColor object.
 */

Tcl_ObjType tkColorObjType = {
    "color",			/* name */
    FreeColorObjProc,		/* freeIntRepProc */
    DupColorObjProc,		/* dupIntRepProc */
    NULL,			/* updateStringProc */
    NULL			/* setFromAnyProc */
};

/*
 *----------------------------------------------------------------------
 *
 * Tk_AllocColorFromObj --
 *
 *	Given a Tcl_Obj *, map the value to a corresponding XColor structure
 *	based on the tkwin given.
 *
 * Results:
 *	The return value is a pointer to an XColor structure that indicates
 *	the red, blue, and green intensities for the color given by the string
 *	in objPtr, and also specifies a pixel value to use to draw in that
 *	color. If an error occurs, NULL is returned and an error message will
 *	be left in interp's result (unless interp is NULL).
 *
 * Side effects:
 *	The color is added to an internal database with a reference count. For
 *	each call to this function, there should eventually be a call to
 *	Tk_FreeColorFromObj so that the database is cleaned up when colors
 *	aren't in use anymore.
 *
 *----------------------------------------------------------------------
 */

XColor *
Tk_AllocColorFromObj(
    Tcl_Interp *interp,		/* Used only for error reporting. If NULL,
				 * then no messages are provided. */
    Tk_Window tkwin,		/* Window in which the color will be used.*/
    Tcl_Obj *objPtr)		/* Object that describes the color; string
				 * value is a color name such as "red" or
				 * "#ff0000".*/
{
    TkColor *tkColPtr;

    if (objPtr->typePtr != &tkColorObjType) {
	InitColorObj(objPtr);
    }
    tkColPtr = (TkColor *) objPtr->internalRep.twoPtrValue.ptr1;

    /*
     * If the object currently points to a TkColor, see if it's the one we
     * want. If so, increment its reference count and return.
     */

    if (tkColPtr != NULL) {
	if (tkColPtr->resourceRefCount == 0) {
	    /*
	     * This is a stale reference: it refers to a TkColor that's no
	     * longer in use. Clear the reference.
	     */

	    FreeColorObjProc(objPtr);
	    tkColPtr = NULL;
	} else if ((Tk_Screen(tkwin) == tkColPtr->screen)
		&& (Tk_Colormap(tkwin) == tkColPtr->colormap)) {
	    tkColPtr->resourceRefCount++;
	    return (XColor *) tkColPtr;
	}
    }

    /*
     * The object didn't point to the TkColor that we wanted. Search the list
     * of TkColors with the same name to see if one of the other TkColors is
     * the right one.
     */

    if (tkColPtr != NULL) {
	TkColor *firstColorPtr = Tcl_GetHashValue(tkColPtr->hashPtr);

	FreeColorObjProc(objPtr);
	for (tkColPtr = firstColorPtr; tkColPtr != NULL;
		tkColPtr = tkColPtr->nextPtr) {
	    if ((Tk_Screen(tkwin) == tkColPtr->screen)
		    && (Tk_Colormap(tkwin) == tkColPtr->colormap)) {
		tkColPtr->resourceRefCount++;
		tkColPtr->objRefCount++;
		objPtr->internalRep.twoPtrValue.ptr1 = (void *) tkColPtr;
		return (XColor *) tkColPtr;
	    }
	}
    }

    /*
     * Still no luck. Call Tk_GetColor to allocate a new TkColor object.
     */

    tkColPtr = (TkColor *) Tk_GetColor(interp, tkwin, Tcl_GetString(objPtr));
    objPtr->internalRep.twoPtrValue.ptr1 = (void *) tkColPtr;
    if (tkColPtr != NULL) {
	tkColPtr->objRefCount++;
    }
    return (XColor *) tkColPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetColor --
 *
 *	Given a string name for a color, map the name to a corresponding
 *	XColor structure.
 *
 * Results:
 *	The return value is a pointer to an XColor structure that indicates
 *	the red, blue, and green intensities for the color given by "name",
 *	and also specifies a pixel value to use to draw in that color. If an
 *	error occurs, NULL is returned and an error message will be left in
 *	the interp's result.
 *
 * Side effects:
 *	The color is added to an internal database with a reference count. For
 *	each call to this function, there should eventually be a call to
 *	Tk_FreeColor so that the database is cleaned up when colors aren't in
 *	use anymore.
 *
 *----------------------------------------------------------------------
 */

XColor *
Tk_GetColor(
    Tcl_Interp *interp,		/* Place to leave error message if color can't
				 * be found. */
    Tk_Window tkwin,		/* Window in which color will be used. */
    Tk_Uid name)		/* Name of color to be allocated (in form
				 * suitable for passing to XParseColor). */
{
    Tcl_HashEntry *nameHashPtr;
    int isNew;
    TkColor *tkColPtr;
    TkColor *existingColPtr;
    TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;

    if (!dispPtr->colorInit) {
	ColorInit(dispPtr);
    }

    /*
     * First, check to see if there's already a mapping for this color name.
     */

    nameHashPtr = Tcl_CreateHashEntry(&dispPtr->colorNameTable, name, &isNew);
    if (!isNew) {
	existingColPtr = Tcl_GetHashValue(nameHashPtr);
	for (tkColPtr = existingColPtr; tkColPtr != NULL;
		tkColPtr = tkColPtr->nextPtr) {
	    if ((tkColPtr->screen == Tk_Screen(tkwin))
		    && (Tk_Colormap(tkwin) == tkColPtr->colormap)) {
		tkColPtr->resourceRefCount++;
		return &tkColPtr->color;
	    }
	}
    } else {
	existingColPtr = NULL;
    }

    /*
     * The name isn't currently known. Map from the name to a pixel value.
     */

    tkColPtr = TkpGetColor(tkwin, name);
    if (tkColPtr == NULL) {
	if (interp != NULL) {
	    if (*name == '#') {
		Tcl_AppendResult(interp, "invalid color name \"", name,
			"\"", NULL);
	    } else {
		Tcl_AppendResult(interp, "unknown color name \"", name,
			"\"", NULL);
	    }
	}
	if (isNew) {
	    Tcl_DeleteHashEntry(nameHashPtr);
	}
	return NULL;
    }

    /*
     * Now create a new TkColor structure and add it to colorNameTable (in
     * TkDisplay).
     */

    tkColPtr->magic = COLOR_MAGIC;
    tkColPtr->gc = None;
    tkColPtr->screen = Tk_Screen(tkwin);
    tkColPtr->colormap = Tk_Colormap(tkwin);
    tkColPtr->visual = Tk_Visual(tkwin);
    tkColPtr->resourceRefCount = 1;
    tkColPtr->objRefCount = 0;
    tkColPtr->type = TK_COLOR_BY_NAME;
    tkColPtr->hashPtr = nameHashPtr;
    tkColPtr->nextPtr = existingColPtr;
    Tcl_SetHashValue(nameHashPtr, tkColPtr);

    return &tkColPtr->color;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetColorByValue --
 *
 *	Given a desired set of red-green-blue intensities for a color, locate
 *	a pixel value to use to draw that color in a given window.
 *
 * Results:
 *	The return value is a pointer to an XColor structure that indicates
 *	the closest red, blue, and green intensities available to those
 *	specified in colorPtr, and also specifies a pixel value to use to draw
 *	in that color.
 *
 * Side effects:
 *	The color is added to an internal database with a reference count. For
 *	each call to this function, there should eventually be a call to
 *	Tk_FreeColor, so that the database is cleaned up when colors aren't in
 *	use anymore.
 *
 *----------------------------------------------------------------------
 */

XColor *
Tk_GetColorByValue(
    Tk_Window tkwin,		/* Window where color will be used. */
    XColor *colorPtr)		/* Red, green, and blue fields indicate
				 * desired color. */
{
    ValueKey valueKey;
    Tcl_HashEntry *valueHashPtr;
    int isNew;
    TkColor *tkColPtr;
    Display *display = Tk_Display(tkwin);
    TkDisplay *dispPtr = TkGetDisplay(display);

    if (!dispPtr->colorInit) {
	ColorInit(dispPtr);
    }

    /*
     * First, check to see if there's already a mapping for this color name.
     * Must clear the structure first; it's not tightly packed on 64-bit
     * systems. [Bug 2911570]
     */

    memset(&valueKey, 0, sizeof(ValueKey));
    valueKey.red = colorPtr->red;
    valueKey.green = colorPtr->green;
    valueKey.blue = colorPtr->blue;
    valueKey.colormap = Tk_Colormap(tkwin);
    valueKey.display = display;
    valueHashPtr = Tcl_CreateHashEntry(&dispPtr->colorValueTable,
	    (char *) &valueKey, &isNew);
    if (!isNew) {
	tkColPtr = Tcl_GetHashValue(valueHashPtr);
	tkColPtr->resourceRefCount++;
	return &tkColPtr->color;
    }

    /*
     * The name isn't currently known. Find a pixel value for this color and
     * add a new structure to colorValueTable (in TkDisplay).
     */

    tkColPtr = TkpGetColorByValue(tkwin, colorPtr);
    tkColPtr->magic = COLOR_MAGIC;
    tkColPtr->gc = None;
    tkColPtr->screen = Tk_Screen(tkwin);
    tkColPtr->colormap = valueKey.colormap;
    tkColPtr->visual = Tk_Visual(tkwin);
    tkColPtr->resourceRefCount = 1;
    tkColPtr->objRefCount = 0;
    tkColPtr->type = TK_COLOR_BY_VALUE;
    tkColPtr->hashPtr = valueHashPtr;
    tkColPtr->nextPtr = NULL;
    Tcl_SetHashValue(valueHashPtr, tkColPtr);
    return &tkColPtr->color;
}

/*
 *--------------------------------------------------------------
 *
 * Tk_NameOfColor --
 *
 *	Given a color, return a textual string identifying the color.
 *
 * Results:
 *	If colorPtr was created by Tk_GetColor, then the return value is the
 *	"string" that was used to create it. Otherwise the return value is a
 *	string that could have been passed to Tk_GetColor to allocate that
 *	color. The storage for the returned string is only guaranteed to
 *	persist up until the next call to this function.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

CONST char *
Tk_NameOfColor(
    XColor *colorPtr)		/* Color whose name is desired. */
{
    register TkColor *tkColPtr = (TkColor *) colorPtr;

    if (tkColPtr->magic==COLOR_MAGIC && tkColPtr->type==TK_COLOR_BY_NAME) {
	return tkColPtr->hashPtr->key.string;
    } else {
	ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
		Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

	sprintf(tsdPtr->rgbString, "#%04x%04x%04x", colorPtr->red,
		colorPtr->green, colorPtr->blue);
	return tsdPtr->rgbString;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GCForColor --
 *
 *	Given a color allocated from this module, this function returns a GC
 *	that can be used for simple drawing with that color.
 *
 * Results:
 *	The return value is a GC with color set as its foreground color and
 *	all other fields defaulted. This GC is only valid as long as the color
 *	exists; it is freed automatically when the last reference to the color
 *	is freed.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

GC
Tk_GCForColor(
    XColor *colorPtr,		/* Color for which a GC is desired. Must have
				 * been allocated by Tk_GetColor. */
    Drawable drawable)		/* Drawable in which the color will be used
				 * (must have same screen and depth as the one
				 * for which the color was allocated). */
{
    TkColor *tkColPtr = (TkColor *) colorPtr;
    XGCValues gcValues;

    /*
     * Do a quick sanity check to make sure this color was really allocated by
     * Tk_GetColor.
     */

    if (tkColPtr->magic != COLOR_MAGIC) {
	Tcl_Panic("Tk_GCForColor called with bogus color");
    }

    if (tkColPtr->gc == None) {
	gcValues.foreground = tkColPtr->color.pixel;
	tkColPtr->gc = XCreateGC(DisplayOfScreen(tkColPtr->screen), drawable,
		GCForeground, &gcValues);
    }
    return tkColPtr->gc;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_FreeColor --
 *
 *	This function is called to release a color allocated by Tk_GetColor.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The reference count associated with colorPtr is deleted, and the color
 *	is released to X if there are no remaining uses for it.
 *
 *----------------------------------------------------------------------
 */

void
Tk_FreeColor(
    XColor *colorPtr)		/* Color to be released. Must have been
				 * allocated by Tk_GetColor or
				 * Tk_GetColorByValue. */
{
    TkColor *tkColPtr = (TkColor *) colorPtr;
    Screen *screen = tkColPtr->screen;
    TkColor *prevPtr;

    /*
     * Do a quick sanity check to make sure this color was really allocated by
     * Tk_GetColor.
     */

    if (tkColPtr->magic != COLOR_MAGIC) {
	Tcl_Panic("Tk_FreeColor called with bogus color");
    }

    tkColPtr->resourceRefCount--;
    if (tkColPtr->resourceRefCount > 0) {
	return;
    }

    /*
     * This color is no longer being actively used, so free the color
     * resources associated with it and remove it from the hash table. No
     * longer any objects referencing it.
     */

    if (tkColPtr->gc != None) {
	XFreeGC(DisplayOfScreen(screen), tkColPtr->gc);
	tkColPtr->gc = None;
    }
    TkpFreeColor(tkColPtr);

    prevPtr = Tcl_GetHashValue(tkColPtr->hashPtr);
    if (prevPtr == tkColPtr) {
	if (tkColPtr->nextPtr == NULL) {
	    Tcl_DeleteHashEntry(tkColPtr->hashPtr);
	} else {
	    Tcl_SetHashValue(tkColPtr->hashPtr, tkColPtr->nextPtr);
	}
    } else {
	while (prevPtr->nextPtr != tkColPtr) {
	    prevPtr = prevPtr->nextPtr;
	}
	prevPtr->nextPtr = tkColPtr->nextPtr;
    }

    /*
     * Free the TkColor structure if there are no objects referencing it.
     * However, if there are objects referencing it then keep the structure
     * around; it will get freed when the last reference is cleared
     */

    if (tkColPtr->objRefCount == 0) {
	ckfree((char *) tkColPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_FreeColorFromObj --
 *
 *	This function is called to release a color allocated by
 *	Tk_AllocColorFromObj. It does not throw away the Tcl_Obj *; it only
 *	gets rid of the hash table entry for this color and clears the cached
 *	value that is normally stored in the object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The reference count associated with the color represented by objPtr is
 *	decremented, and the color is released to X if there are no remaining
 *	uses for it.
 *
 *----------------------------------------------------------------------
 */

void
Tk_FreeColorFromObj(
    Tk_Window tkwin,		/* The window this color lives in. Needed for
				 * the screen and colormap values. */
    Tcl_Obj *objPtr)		/* The Tcl_Obj * to be freed. */
{
    Tk_FreeColor(Tk_GetColorFromObj(tkwin, objPtr));
    FreeColorObjProc(objPtr);
}

/*
 *---------------------------------------------------------------------------
 *
 * FreeColorObjProc --
 *
 *	This proc is called to release an object reference to a color. Called
 *	when the object's internal rep is released or when the cached tkColPtr
 *	needs to be changed.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object reference count is decremented. When both it and the hash
 *	ref count go to zero, the color's resources are released.
 *
 *---------------------------------------------------------------------------
 */

static void
FreeColorObjProc(
    Tcl_Obj *objPtr)		/* The object we are releasing. */
{
    TkColor *tkColPtr = (TkColor *) objPtr->internalRep.twoPtrValue.ptr1;

    if (tkColPtr != NULL) {
	tkColPtr->objRefCount--;
	if ((tkColPtr->objRefCount == 0)
		&& (tkColPtr->resourceRefCount == 0)) {
	    ckfree((char *) tkColPtr);
	}
	objPtr->internalRep.twoPtrValue.ptr1 = NULL;
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * DupColorObjProc --
 *
 *	When a cached color object is duplicated, this is called to update the
 *	internal reps.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The color's objRefCount is incremented and the internal rep of the
 *	copy is set to point to it.
 *
 *---------------------------------------------------------------------------
 */

static void
DupColorObjProc(
    Tcl_Obj *srcObjPtr,		/* The object we are copying from. */
    Tcl_Obj *dupObjPtr)		/* The object we are copying to. */
{
    TkColor *tkColPtr = (TkColor *) srcObjPtr->internalRep.twoPtrValue.ptr1;

    dupObjPtr->typePtr = srcObjPtr->typePtr;
    dupObjPtr->internalRep.twoPtrValue.ptr1 = (void *) tkColPtr;

    if (tkColPtr != NULL) {
	tkColPtr->objRefCount++;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetColorFromObj --
 *
 *	Returns the color referred to by a Tcl object. The color must already
 *	have been allocated via a call to Tk_AllocColorFromObj or Tk_GetColor.
 *
 * Results:
 *	Returns the XColor * that matches the tkwin and the string rep of
 *	objPtr.
 *
 * Side effects:
 *	If the object is not already a color, the conversion will free any old
 *	internal representation.
 *
 *----------------------------------------------------------------------
 */

XColor *
Tk_GetColorFromObj(
    Tk_Window tkwin,		/* The window in which the color will be
				 * used. */
    Tcl_Obj *objPtr)		/* String value contains the name of the
				 * desired color. */
{
    TkColor *tkColPtr;
    Tcl_HashEntry *hashPtr;
    TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;

    if (objPtr->typePtr != &tkColorObjType) {
	InitColorObj(objPtr);
    }

    /*
     * First check to see if the internal representation of the object is
     * defined and is a color that is valid for the current screen and color
     * map. If it is, we are done.
     */

    tkColPtr = (TkColor *) objPtr->internalRep.twoPtrValue.ptr1;
    if ((tkColPtr != NULL)
	    && (tkColPtr->resourceRefCount > 0)
	    && (Tk_Screen(tkwin) == tkColPtr->screen)
	    && (Tk_Colormap(tkwin) == tkColPtr->colormap)) {
	/*
	 * The object already points to the right TkColor structure. Just
	 * return it.
	 */

	return (XColor *) tkColPtr;
    }

    /*
     * If we reach this point, it means that the TkColor structure that we
     * have cached in the internal representation is not valid for the current
     * screen and colormap. But there is a list of other TkColor structures
     * attached to the TkDisplay. Walk this list looking for the right TkColor
     * structure.
     */

    hashPtr = Tcl_FindHashEntry(&dispPtr->colorNameTable,
	    Tcl_GetString(objPtr));
    if (hashPtr == NULL) {
	goto error;
    }
    for (tkColPtr = Tcl_GetHashValue(hashPtr);
	    (tkColPtr != NULL); tkColPtr = tkColPtr->nextPtr) {
	if ((Tk_Screen(tkwin) == tkColPtr->screen)
		&& (Tk_Colormap(tkwin) == tkColPtr->colormap)) {
	    FreeColorObjProc(objPtr);
	    objPtr->internalRep.twoPtrValue.ptr1 = (void *) tkColPtr;
	    tkColPtr->objRefCount++;
	    return (XColor *) tkColPtr;
	}
    }

  error:
    Tcl_Panic("Tk_GetColorFromObj called with non-existent color!");
    /*
     * The following code isn't reached; it's just there to please compilers.
     */
    return NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * InitColorObj --
 *
 *	Bookeeping function to change an objPtr to a color type.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The old internal rep of the object is freed. The object's type is set
 *	to color with a NULL TkColor pointer (the pointer will be set later by
 *	either Tk_AllocColorFromObj or Tk_GetColorFromObj).
 *
 *----------------------------------------------------------------------
 */

static void
InitColorObj(
    Tcl_Obj *objPtr)		/* The object to convert. */
{
    const Tcl_ObjType *typePtr;

    /*
     * Free the old internalRep before setting the new one.
     */

    Tcl_GetString(objPtr);
    typePtr = objPtr->typePtr;
    if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
	(*typePtr->freeIntRepProc)(objPtr);
    }
    objPtr->typePtr = &tkColorObjType;
    objPtr->internalRep.twoPtrValue.ptr1 = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * ColorInit --
 *
 *	Initialize the structure used for color management.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Read the code.
 *
 *----------------------------------------------------------------------
 */

static void
ColorInit(
    TkDisplay *dispPtr)
{
    if (!dispPtr->colorInit) {
	dispPtr->colorInit = 1;
	Tcl_InitHashTable(&dispPtr->colorNameTable, TCL_STRING_KEYS);
	Tcl_InitHashTable(&dispPtr->colorValueTable,
		sizeof(ValueKey)/sizeof(int));
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkDebugColor --
 *
 *	This function returns debugging information about a color.
 *
 * Results:
 *	The return value is a list with one sublist for each TkColor
 *	corresponding to "name". Each sublist has two elements that contain
 *	the resourceRefCount and objRefCount fields from the TkColor
 *	structure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TkDebugColor(
    Tk_Window tkwin,		/* The window in which the color will be used
				 * (not currently used). */
    char *name)			/* Name of the desired color. */
{
    Tcl_HashEntry *hashPtr;
    Tcl_Obj *resultPtr;
    TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;

    resultPtr = Tcl_NewObj();
    hashPtr = Tcl_FindHashEntry(&dispPtr->colorNameTable, name);
    if (hashPtr != NULL) {
	TkColor *tkColPtr = Tcl_GetHashValue(hashPtr);

	if (tkColPtr == NULL) {
	    Tcl_Panic("TkDebugColor found empty hash table entry");
	}
	for ( ; (tkColPtr != NULL); tkColPtr = tkColPtr->nextPtr) {
	    Tcl_Obj *objPtr = Tcl_NewObj();

	    Tcl_ListObjAppendElement(NULL, objPtr,
		    Tcl_NewIntObj(tkColPtr->resourceRefCount));
	    Tcl_ListObjAppendElement(NULL, objPtr,
		    Tcl_NewIntObj(tkColPtr->objRefCount));
	    Tcl_ListObjAppendElement(NULL, resultPtr, objPtr);
	}
    }
    return resultPtr;
}

#ifndef __WIN32__

/* This function is not necessary for Win32,
 * since XParseColor already does the right thing */

#undef XParseColor

CONST char *CONST tkWebColors[20] = {
    /* 'a' */ "qua\0#0000ffffffff",
    /* 'b' */ NULL,
    /* 'c' */ "rimson\0#dcdc14143c3c",
    /* 'd' */ NULL,
    /* 'e' */ NULL,
    /* 'f' */ "uchsia\0#ffff0000ffff",
    /* 'g' */ NULL,
    /* 'h' */ NULL,
    /* 'i' */ "ndigo\0#4b4b00008282",
    /* 'j' */ NULL,
    /* 'k' */ NULL,
    /* 'l' */ "ime\0#0000ffff0000",
    /* 'm' */ NULL,
    /* 'n' */ NULL,
    /* 'o' */ "live\0#808080800000",
    /* 'p' */ NULL,
    /* 'q' */ NULL,
    /* 'r' */ NULL,
    /* 's' */ "ilver\0#c0c0c0c0c0c0",
    /* 't' */ "eal\0#000080808080"
};

Status
TkParseColor(
    Display *display,		/* The display */
    Colormap map,			/* Color map */
    const char *name,     /* String to be parsed */
    XColor *color)
{
    char buf[14];
    if (*name == '#') {
	buf[0] = '#'; buf[13] = '\0';
	if (!*(++name) || !*(++name) || !*(++name)) {
	    /* Not at least 3 hex digits, so invalid */
	return 0;
	} else if (!*(++name)) {
	    /* Exactly 3 hex digits */
	    buf[9] = buf[10] = buf[11] = buf[12] = *(--name);
	    buf[5] = buf[6] = buf[7] = buf[8] = *(--name);
	    buf[1] = buf[2] = buf[3] = buf[4] = *(--name);
	    name = buf;
	} else if (!*(++name)	|| !*(++name)) {
	    /* Not at least 6 hex digits, so invalid */
	    return 0;
	} else if (!*(++name)) {
	    /* Exactly 6 hex digits */
	    buf[10] = buf[12] = *(--name);
	    buf[9] = buf[11] = *(--name);
	    buf[6] = buf[8] = *(--name);
	    buf[5] = buf[7] = *(--name);
	    buf[2] = buf[4] = *(--name);
	    buf[1] = buf[3] = *(--name);
	    name = buf;
	} else if (!*(++name) || !*(++name)) {
	    /* Not at least 9 hex digits, so invalid */
	    return 0;
	} else if (!*(++name)) {
	    /* Exactly 9 hex digits */
	    buf[11] = *(--name);
	    buf[10] = *(--name);
	    buf[9] = buf[12] = *(--name);
	    buf[7] = *(--name);
	    buf[6] = *(--name);
	    buf[5] = buf[8] = *(--name);
	    buf[3] = *(--name);
	    buf[2] = *(--name);
	    buf[1] = buf[4] = *(--name);
	    name = buf;
	} else if (!*(++name) || !*(++name) || *(++name)) {
	    /* Not exactly 12 hex digits, so invalid */
	    return 0;
	} else {
	    name -= 13;
	}
	goto done;
    } else if (((*name - 'A') & 0xdf) < sizeof(tkWebColors)/sizeof(tkWebColors[0])) {
	const char *p = tkWebColors[((*name - 'A') & 0x1f)];
	if (p) {
	    const char *q = name;
	    while (!((*p - *(++q)) & 0xdf)) {
		if (!*p++) {
		    name = p;
		    goto done;
		}
	    }
	}
    }
    if (strlen(name) > 99) {
	/* Don't bother to parse this. [Bug 2809525]*/
	return 0;
    }
done:
    return XParseColor(display, map, name, color);
}
#endif /* __WIN32__ */
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */