summaryrefslogtreecommitdiffstats
path: root/generic/tkObj.c
blob: c4258647aa996ff1920e48d70c130263f2a8c682 (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
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
/*
 * tkObj.c --
 *
 *	This file contains functions that implement the common Tk object types
 *
 * Copyright (c) 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.
 *
 * RCS: @(#) $Id: tkObj.c,v 1.19.2.1 2008/12/21 23:52:45 ferrieux Exp $
 */

#include "tkInt.h"

/*
 * The following structure is the internal representation for pixel objects.
 */

typedef struct PixelRep {
    double value;
    int units;
    Tk_Window tkwin;
    int returnValue;
} PixelRep;

#define SIMPLE_PIXELREP(objPtr)				\
    ((objPtr)->internalRep.twoPtrValue.ptr2 == 0)

#define SET_SIMPLEPIXEL(objPtr, intval)			\
    (objPtr)->internalRep.twoPtrValue.ptr1 = INT2PTR(intval);	\
    (objPtr)->internalRep.twoPtrValue.ptr2 = 0

#define GET_SIMPLEPIXEL(objPtr)				\
    (PTR2INT((objPtr)->internalRep.twoPtrValue.ptr1))

#define SET_COMPLEXPIXEL(objPtr, repPtr)		\
    (objPtr)->internalRep.twoPtrValue.ptr1 = 0;		\
    (objPtr)->internalRep.twoPtrValue.ptr2 = (VOID *) repPtr

#define GET_COMPLEXPIXEL(objPtr)			\
    ((PixelRep *) (objPtr)->internalRep.twoPtrValue.ptr2)


/*
 * The following structure is the internal representation for mm objects.
 */

typedef struct MMRep {
    double value;
    int units;
    Tk_Window tkwin;
    double returnValue;
} MMRep;

/*
 * The following structure is the internal representation for window objects.
 * A WindowRep caches name-to-window lookups. The cache is invalid if tkwin is
 * NULL or if mainPtr->deletionEpoch does not match epoch.
 */

typedef struct WindowRep {
    Tk_Window tkwin;		/* Cached window; NULL if not found. */
    TkMainInfo *mainPtr;	/* MainWindow associated with tkwin. */
    long epoch;			/* Value of mainPtr->deletionEpoch at last
				 * successful lookup. */
} WindowRep;

/*
 * Prototypes for functions defined later in this file:
 */

static void		DupMMInternalRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr);
static void		DupPixelInternalRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr);
static void		DupWindowInternalRep(Tcl_Obj *srcPtr,Tcl_Obj *copyPtr);
static void		FreeMMInternalRep(Tcl_Obj *objPtr);
static void		FreePixelInternalRep(Tcl_Obj *objPtr);
static void		FreeWindowInternalRep(Tcl_Obj *objPtr);
static void		UpdateStringOfMM(Tcl_Obj *objPtr);
static int		SetMMFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static int		SetPixelFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static int		SetWindowFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);

/*
 * The following structure defines the implementation of the "pixel" Tcl
 * object, used for measuring distances. The pixel object remembers its
 * initial display-independant settings.
 */

static Tcl_ObjType pixelObjType = {
    "pixel",			/* name */
    FreePixelInternalRep,	/* freeIntRepProc */
    DupPixelInternalRep,	/* dupIntRepProc */
    NULL,			/* updateStringProc */
    SetPixelFromAny		/* setFromAnyProc */
};

/*
 * The following structure defines the implementation of the "pixel" Tcl
 * object, used for measuring distances. The pixel object remembers its
 * initial display-independant settings.
 */

static Tcl_ObjType mmObjType = {
    "mm",			/* name */
    FreeMMInternalRep,		/* freeIntRepProc */
    DupMMInternalRep,		/* dupIntRepProc */
    UpdateStringOfMM,		/* updateStringProc */
    SetMMFromAny		/* setFromAnyProc */
};

/*
 * The following structure defines the implementation of the "window"
 * Tcl object.
 */

static Tcl_ObjType windowObjType = {
    "window",			/* name */
    FreeWindowInternalRep,	/* freeIntRepProc */
    DupWindowInternalRep,	/* dupIntRepProc */
    NULL,			/* updateStringProc */
    SetWindowFromAny		/* setFromAnyProc */
};

/*
 *----------------------------------------------------------------------
 *
 * GetPixelsFromObjEx --
 *
 *	Attempt to return a pixel value from the Tcl object "objPtr". If the
 *	object is not already a pixel value, an attempt will be made to
 *	convert it to one.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already a pixel, the conversion will free any old
 *	internal representation.
 *
 *----------------------------------------------------------------------
 */

static
int
GetPixelsFromObjEx(
    Tcl_Interp *interp, 	/* Used for error reporting if not NULL. */
    Tk_Window tkwin,
    Tcl_Obj *objPtr,		/* The object from which to get pixels. */
    int *intPtr,
    double *dblPtr)		/* Places to store resulting pixels. */
{
    int result,fresh;
    double d;
    PixelRep *pixelPtr;
    static double bias[] = {
	1.0,	10.0,	25.4,	0.35278 /*25.4 / 72.0*/
    };

 retry:
    if (objPtr->typePtr != &pixelObjType) {
	result = SetPixelFromAny(interp, objPtr);
	if (result != TCL_OK) {
	    return result;
	}
	fresh=1;
    } else {
	fresh=0;
    }

    if (SIMPLE_PIXELREP(objPtr)) {
	*intPtr = GET_SIMPLEPIXEL(objPtr);
	if (dblPtr) {
	    *dblPtr=(double)(*intPtr);
	}
    } else {
	pixelPtr = GET_COMPLEXPIXEL(objPtr);
	if ((!fresh) && (pixelPtr->tkwin != tkwin))
	    {
		/* in case of exo-screen conversions of non-pixels
		 * we force a recomputation from the string
		 */

		FreePixelInternalRep(objPtr);
		goto retry;
	    }
	if ((pixelPtr->tkwin != tkwin)||dblPtr) {
	    d = pixelPtr->value;
	    if (pixelPtr->units >= 0) {
		d *= bias[pixelPtr->units] * WidthOfScreen(Tk_Screen(tkwin));
		d /= WidthMMOfScreen(Tk_Screen(tkwin));
	    }
	    if (d < 0) {
		pixelPtr->returnValue = (int) (d - 0.5);
	    } else {
		pixelPtr->returnValue = (int) (d + 0.5);
	    }
	    pixelPtr->tkwin = tkwin;
	    if (dblPtr) {
		*dblPtr=(double)d;
	    }
	}
	*intPtr = pixelPtr->returnValue;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetPixelsFromObj --
 *
 *	Attempt to return a pixel value from the Tcl object "objPtr". If the
 *	object is not already a pixel value, an attempt will be made to
 *	convert it to one.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already a pixel, the conversion will free any old
 *	internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tk_GetPixelsFromObj(
    Tcl_Interp *interp, 	/* Used for error reporting if not NULL. */
    Tk_Window tkwin,
    Tcl_Obj *objPtr,		/* The object from which to get pixels. */
    int *intPtr)		/* Place to store resulting pixels. */
{
    return GetPixelsFromObjEx(interp,tkwin,objPtr,intPtr,NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetDoublePixelsFromObj --
 *
 *	Attempt  to  return   a  double  pixel  value  from   the  Tcl  object
 *	"objPtr". If the object is not  already a pixel value, an attempt will
 *	be made to convert it to one, the internal unit being pixels.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already a pixel, the conversion will free any old
 *	internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tk_GetDoublePixelsFromObj(
    Tcl_Interp *interp, 	/* Used for error reporting if not NULL. */
    Tk_Window tkwin,
    Tcl_Obj *objPtr,		/* The object from which to get pixels. */
    double *doublePtr)		/* Place to store resulting pixels. */
{
    double d;
    int result,val;

    result=GetPixelsFromObjEx(interp, tkwin, objPtr, &val, &d);
    if (result != TCL_OK) {
	return result;
    }
    if (!SIMPLE_PIXELREP(objPtr)) {
	PixelRep *pixelPtr;
	pixelPtr = GET_COMPLEXPIXEL(objPtr);
	if (pixelPtr->units >= 0) {
	    /* internally "shimmer" to pixel units */
	    pixelPtr->units=-1;
	    pixelPtr->value=d;
	}
    }
    *doublePtr = d;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * FreePixelInternalRep --
 *
 *	Deallocate the storage associated with a pixel object's internal
 *	representation.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Frees objPtr's internal representation and sets objPtr's internalRep
 *	to NULL.
 *
 *----------------------------------------------------------------------
 */

static void
FreePixelInternalRep(
    Tcl_Obj *objPtr)		/* Pixel object with internal rep to free. */
{
    PixelRep *pixelPtr;

    if (!SIMPLE_PIXELREP(objPtr)) {
	pixelPtr = GET_COMPLEXPIXEL(objPtr);
	ckfree((char *) pixelPtr);
    }
    SET_SIMPLEPIXEL(objPtr, 0);
    objPtr->typePtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * DupPixelInternalRep --
 *
 *	Initialize the internal representation of a pixel Tcl_Obj to a copy of
 *	the internal representation of an existing pixel object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	copyPtr's internal rep is set to the pixel corresponding to srcPtr's
 *	internal rep.
 *
 *----------------------------------------------------------------------
 */

static void
DupPixelInternalRep(
    register Tcl_Obj *srcPtr,	/* Object with internal rep to copy. */
    register Tcl_Obj *copyPtr)	/* Object with internal rep to set. */
{
    PixelRep *oldPtr, *newPtr;

    copyPtr->typePtr = srcPtr->typePtr;

    if (SIMPLE_PIXELREP(srcPtr)) {
	SET_SIMPLEPIXEL(copyPtr, GET_SIMPLEPIXEL(srcPtr));
    } else {
	oldPtr = GET_COMPLEXPIXEL(srcPtr);
	newPtr = (PixelRep *) ckalloc(sizeof(PixelRep));
	newPtr->value = oldPtr->value;
	newPtr->units = oldPtr->units;
	newPtr->tkwin = oldPtr->tkwin;
	newPtr->returnValue = oldPtr->returnValue;
	SET_COMPLEXPIXEL(copyPtr, newPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * SetPixelFromAny --
 *
 *	Attempt to generate a pixel internal form for the Tcl object "objPtr".
 *
 * Results:
 *	The return value is a standard Tcl result. If an error occurs during
 *	conversion, an error message is left in the interpreter's result
 *	unless "interp" is NULL.
 *
 * Side effects:
 *	If no error occurs, a pixel representation of the object is stored
 *	internally and the type of "objPtr" is set to pixel.
 *
 *----------------------------------------------------------------------
 */

static int
SetPixelFromAny(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    Tcl_Obj *objPtr)		/* The object to convert. */
{
    const Tcl_ObjType *typePtr;
    char *string, *rest;
    double d;
    int i, units;

    string = Tcl_GetStringFromObj(objPtr, NULL);

    d = strtod(string, &rest);
    if (rest == string) {
	goto error;
    }
    while ((*rest != '\0') && isspace(UCHAR(*rest))) {
	rest++;
    }

    switch (*rest) {
    case '\0':
	units = -1;
	break;
    case 'm':
	units = 0;
	break;
    case 'c':
	units = 1;
	break;
    case 'i':
	units = 2;
	break;
    case 'p':
	units = 3;
	break;
    default:
	goto error;
    }

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

    typePtr = objPtr->typePtr;
    if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
	(*typePtr->freeIntRepProc)(objPtr);
    }

    objPtr->typePtr = &pixelObjType;

    i = (int) d;
    if ((units < 0) && (i == d)) {
	SET_SIMPLEPIXEL(objPtr, i);
    } else {
	PixelRep *pixelPtr = (PixelRep *) ckalloc(sizeof(PixelRep));

	pixelPtr->value = d;
	pixelPtr->units = units;
	pixelPtr->tkwin = NULL;
	pixelPtr->returnValue = i;
	SET_COMPLEXPIXEL(objPtr, pixelPtr);
    }
    return TCL_OK;

  error:
    if (interp != NULL) {
	/*
	 * Must copy string before resetting the result in case a caller is
	 * trying to convert the interpreter's result to pixels.
	 */

	char buf[100];

	sprintf(buf, "bad screen distance \"%.50s\"", string);
	Tcl_ResetResult(interp);
	Tcl_AppendResult(interp, buf, NULL);
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetMMFromObj --
 *
 *	Attempt to return an mm value from the Tcl object "objPtr". If the
 *	object is not already an mm value, an attempt will be made to convert
 *	it to one.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already a pixel, the conversion will free any old
 *	internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tk_GetMMFromObj(
    Tcl_Interp *interp, 	/* Used for error reporting if not NULL. */
    Tk_Window tkwin,
    Tcl_Obj *objPtr,		/* The object from which to get mms. */
    double *doublePtr)		/* Place to store resulting millimeters. */
{
    int result;
    double d;
    MMRep *mmPtr;
    static double bias[] = {
	10.0,	25.4,	1.0,	0.35278 /*25.4 / 72.0*/
    };

    if (objPtr->typePtr != &mmObjType) {
	result = SetMMFromAny(interp, objPtr);
	if (result != TCL_OK) {
	    return result;
	}
    }

    mmPtr = (MMRep *) objPtr->internalRep.otherValuePtr;
    if (mmPtr->tkwin != tkwin) {
	d = mmPtr->value;
	if (mmPtr->units == -1) {
	    d /= WidthOfScreen(Tk_Screen(tkwin));
	    d *= WidthMMOfScreen(Tk_Screen(tkwin));
	} else {
	    d *= bias[mmPtr->units];
	}
	mmPtr->tkwin = tkwin;
	mmPtr->returnValue = d;
    }
    *doublePtr = mmPtr->returnValue;

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeMMInternalRep --
 *
 *	Deallocate the storage associated with a mm object's internal
 *	representation.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Frees objPtr's internal representation and sets objPtr's internalRep
 *	to NULL.
 *
 *----------------------------------------------------------------------
 */

static void
FreeMMInternalRep(
    Tcl_Obj *objPtr)		/* MM object with internal rep to free. */
{
    ckfree((char *) objPtr->internalRep.otherValuePtr);
    objPtr->internalRep.otherValuePtr = NULL;
    objPtr->typePtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * DupMMInternalRep --
 *
 *	Initialize the internal representation of a pixel Tcl_Obj to a copy of
 *	the internal representation of an existing pixel object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	copyPtr's internal rep is set to the pixel corresponding to srcPtr's
 *	internal rep.
 *
 *----------------------------------------------------------------------
 */

static void
DupMMInternalRep(
    register Tcl_Obj *srcPtr,	/* Object with internal rep to copy. */
    register Tcl_Obj *copyPtr)	/* Object with internal rep to set. */
{
    MMRep *oldPtr, *newPtr;

    copyPtr->typePtr = srcPtr->typePtr;
    oldPtr = (MMRep *) srcPtr->internalRep.otherValuePtr;
    newPtr = (MMRep *) ckalloc(sizeof(MMRep));
    newPtr->value = oldPtr->value;
    newPtr->units = oldPtr->units;
    newPtr->tkwin = oldPtr->tkwin;
    newPtr->returnValue = oldPtr->returnValue;
    copyPtr->internalRep.otherValuePtr = (VOID *) newPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfMM --
 *
 *	Update the string representation for a pixel Tcl_Obj this function is
 *	only called, if the pixel Tcl_Obj has no unit, because with units the
 *	string representation is created by SetMMFromAny
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's string is set to a valid string that results from the
 *	double-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfMM(
    register Tcl_Obj *objPtr)   /* pixel obj with string rep to update. */
{
    MMRep *mmPtr;
    char buffer[TCL_DOUBLE_SPACE];
    register int len;

    mmPtr = (MMRep *) objPtr->internalRep.otherValuePtr;
    /* assert( mmPtr->units == -1 && objPtr->bytes == NULL ); */
    if ((mmPtr->units != -1) || (objPtr->bytes != NULL)) {
	Tcl_Panic("UpdateStringOfMM: false precondition");
    }

    Tcl_PrintDouble(NULL, mmPtr->value, buffer);
    len = (int)strlen(buffer);

    objPtr->bytes = (char *) ckalloc((unsigned) len + 1);
    strcpy(objPtr->bytes, buffer);
    objPtr->length = len;
}

/*
 *----------------------------------------------------------------------
 *
 * SetMMFromAny --
 *
 *	Attempt to generate a mm internal form for the Tcl object "objPtr".
 *
 * Results:
 *	The return value is a standard Tcl result. If an error occurs during
 *	conversion, an error message is left in the interpreter's result
 *	unless "interp" is NULL.
 *
 * Side effects:
 *	If no error occurs, a mm representation of the object is stored
 *	internally and the type of "objPtr" is set to mm.
 *
 *----------------------------------------------------------------------
 */

static int
SetMMFromAny(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    Tcl_Obj *objPtr)		/* The object to convert. */
{
    const Tcl_ObjType *typePtr;
    char *string, *rest;
    double d;
    int units;
    MMRep *mmPtr;

    static const Tcl_ObjType *tclDoubleObjType = NULL;
    static const Tcl_ObjType *tclIntObjType = NULL;

    if (tclDoubleObjType == NULL) {
	/*
	 * Cache the object types for comaprison below. This allows optimized
	 * checks for standard cases.
	 */

	tclDoubleObjType = Tcl_GetObjType("double");
	tclIntObjType    = Tcl_GetObjType("int");
    }

    if (objPtr->typePtr == tclDoubleObjType) {
	Tcl_GetDoubleFromObj(interp, objPtr, &d);
	units = -1;
    } else if (objPtr->typePtr == tclIntObjType) {
	Tcl_GetIntFromObj(interp, objPtr, &units);
	d = (double) units;
	units = -1;

	/*
	 * In the case of ints, we need to ensure that a valid string exists
	 * in order for int-but-not-string objects to be converted back to
	 * ints again from mm obj types.
	 */

	(void) Tcl_GetStringFromObj(objPtr, NULL);
    } else {
	/*
	 * It wasn't a known int or double, so parse it.
	 */

	string = Tcl_GetStringFromObj(objPtr, NULL);

	d = strtod(string, &rest);
	if (rest == string) {
	    /*
	     * Must copy string before resetting the result in case a caller
	     * is trying to convert the interpreter's result to mms.
	     */

	error:
	    Tcl_AppendResult(interp, "bad screen distance \"", string,
		    "\"", NULL);
	    return TCL_ERROR;
	}
	while ((*rest != '\0') && isspace(UCHAR(*rest))) {
	    rest++;
	}

	switch (*rest) {
	case '\0':
	    units = -1;
	    break;
	case 'c':
	    units = 0;
	    break;
	case 'i':
	    units = 1;
	    break;
	case 'm':
	    units = 2;
	    break;
	case 'p':
	    units = 3;
	    break;
	default:
	    goto error;
	}
    }

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

    typePtr = objPtr->typePtr;
    if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
	(*typePtr->freeIntRepProc)(objPtr);
    }

    objPtr->typePtr	= &mmObjType;

    mmPtr		= (MMRep *) ckalloc(sizeof(MMRep));
    mmPtr->value	= d;
    mmPtr->units	= units;
    mmPtr->tkwin	= NULL;
    mmPtr->returnValue	= d;

    objPtr->internalRep.otherValuePtr = (VOID *) mmPtr;

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TkGetWindowFromObj --
 *
 *	Attempt to return a Tk_Window from the Tcl object "objPtr". If the
 *	object is not already a Tk_Window, an attempt will be made to convert
 *	it to one.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already a Tk_Window, the conversion will free any
 *	old internal representation.
 *
 *----------------------------------------------------------------------
 */

int
TkGetWindowFromObj(
    Tcl_Interp *interp, 	/* Used for error reporting if not NULL. */
    Tk_Window tkwin,		/* A token to get the main window from. */
    Tcl_Obj *objPtr,		/* The object from which to get window. */
    Tk_Window *windowPtr)	/* Place to store resulting window. */
{
    TkMainInfo *mainPtr = ((TkWindow *)tkwin)->mainPtr;
    register WindowRep *winPtr;
    int result;

    result = Tcl_ConvertToType(interp, objPtr, &windowObjType);
    if (result != TCL_OK) {
	return result;
    }

    winPtr = (WindowRep *) objPtr->internalRep.otherValuePtr;
    if (    winPtr->tkwin == NULL
	 || winPtr->mainPtr == NULL
	 || winPtr->mainPtr != mainPtr
	 || winPtr->epoch != mainPtr->deletionEpoch)
    {
	/* Cache is invalid.
	 */
	winPtr->tkwin = Tk_NameToWindow(interp,
		Tcl_GetStringFromObj(objPtr, NULL), tkwin);
	winPtr->mainPtr = mainPtr;
	winPtr->epoch = mainPtr ? mainPtr->deletionEpoch : 0;
    }

    *windowPtr = winPtr->tkwin;

    if (winPtr->tkwin == NULL) {
	/* ASSERT: Tk_NameToWindow has left error message in interp */
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * SetWindowFromAny --
 *
 *	Generate a windowObj internal form for the Tcl object "objPtr".
 *
 * Results:
 *	Always returns TCL_OK.
 *
 * Side effects:
 *	Sets objPtr's internal representation to an uninitialized windowObj.
 *	Frees the old internal representation, if any.
 *
 * See also:
 * 	TkGetWindowFromObj, which initializes the WindowRep cache.
 *
 *----------------------------------------------------------------------
 */

static int
SetWindowFromAny(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr)	/* The object to convert. */
{
    const Tcl_ObjType *typePtr;
    WindowRep *winPtr;

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

    Tcl_GetStringFromObj(objPtr, NULL);
    typePtr = objPtr->typePtr;
    if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
	(*typePtr->freeIntRepProc)(objPtr);
    }

    winPtr = (WindowRep *) ckalloc(sizeof(WindowRep));
    winPtr->tkwin = NULL;
    winPtr->mainPtr = NULL;
    winPtr->epoch = 0;

    objPtr->internalRep.otherValuePtr = (VOID*)winPtr;
    objPtr->typePtr = &windowObjType;

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * DupWindowInternalRep --
 *
 *	Initialize the internal representation of a window Tcl_Obj to a copy
 *	of the internal representation of an existing window object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	copyPtr's internal rep is set to refer to the same window as srcPtr's
 *	internal rep.
 *
 *----------------------------------------------------------------------
 */

static void
DupWindowInternalRep(
    register Tcl_Obj *srcPtr,
    register Tcl_Obj *copyPtr)
{
    register WindowRep *oldPtr, *newPtr;

    oldPtr = srcPtr->internalRep.otherValuePtr;
    newPtr = (WindowRep *) ckalloc(sizeof(WindowRep));
    newPtr->tkwin = oldPtr->tkwin;
    newPtr->mainPtr = oldPtr->mainPtr;
    newPtr->epoch = oldPtr->epoch;
    copyPtr->internalRep.otherValuePtr = (VOID *)newPtr;
    copyPtr->typePtr = srcPtr->typePtr;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeWindowInternalRep --
 *
 *	Deallocate the storage associated with a window object's internal
 *	representation.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Frees objPtr's internal representation and sets objPtr's internalRep
 *	to NULL.
 *
 *----------------------------------------------------------------------
 */

static void
FreeWindowInternalRep(
    Tcl_Obj *objPtr)		/* Window object with internal rep to free. */
{
    ckfree((char *) objPtr->internalRep.otherValuePtr);
    objPtr->internalRep.otherValuePtr = NULL;
    objPtr->typePtr = NULL;
}

/*
 *--------------------------------------------------------------
 *
 * TkParsePadAmount --
 *
 *	This function parses a padding specification and returns the
 *	appropriate padding values. A padding specification can be either a
 *	single pixel width, or a list of two pixel widths. If a single pixel
 *	width, the amount specified is used for padding on both sides. If two
 *	amounts are specified, then they specify the left/right or top/bottom
 *	padding.
 *
 * Results:
 *	A standard Tcl return value.
 *
 * Side effects:
 *	An error message is written to the interpreter if something is not
 *	right.
 *
 *--------------------------------------------------------------
 */

int
TkParsePadAmount(
    Tcl_Interp *interp,		/* Interpreter for error reporting. */
    Tk_Window tkwin,		/* A window.  Needed by Tk_GetPixels() */
    Tcl_Obj *specObj,		/* The argument to "-padx", "-pady", "-ipadx",
				 * or "-ipady". The thing to be parsed. */
    int *halfPtr,		/* Write the left/top part of padding here */
    int *allPtr)		/* Write the total padding here */
{
    int firstInt, secondInt;    /* The two components of the padding */
    int objc;			/* The length of the list (should be 1 or 2) */
    Tcl_Obj **objv;		/* The objects in the list */

    /*
     * Check for a common case where a single object would otherwise
     * be shimmered between a list and a pixel spec.
     */

    if (specObj->typePtr == &pixelObjType) {
	if (Tk_GetPixelsFromObj(interp, tkwin, specObj, &firstInt) != TCL_OK) {
	    Tcl_ResetResult(interp);
	    Tcl_AppendResult(interp, "bad pad value \"",
		    Tcl_GetString(specObj),
		    "\": must be positive screen distance", NULL);
	    return TCL_ERROR;
	}
	secondInt = firstInt;
	goto done;
    }

    /*
     * Pad specifications are a list of one or two elements, each of which is
     * a pixel specification.
     */

    if (Tcl_ListObjGetElements(interp, specObj, &objc, &objv) != TCL_OK) {
	return TCL_ERROR;
    }
    if (objc != 1 && objc != 2) {
	Tcl_AppendResult(interp,
		"wrong number of parts to pad specification", NULL);
	return TCL_ERROR;
    }

    /*
     * Parse the first part.
     */

    if (Tk_GetPixelsFromObj(interp, tkwin, objv[0], &firstInt) != TCL_OK ||
	    (firstInt < 0)) {
	Tcl_ResetResult(interp);
	Tcl_AppendResult(interp, "bad pad value \"", Tcl_GetString(objv[0]),
		"\": must be positive screen distance", NULL);
	return TCL_ERROR;
    }

    /*
     * Parse the second part if it exists, otherwise it is as if it was the
     * same as the first part.
     */

    if (objc == 1) {
	secondInt = firstInt;
    } else if (Tk_GetPixelsFromObj(interp, tkwin, objv[1],
	    &secondInt) != TCL_OK || (secondInt < 0)) {
	Tcl_ResetResult(interp);
	Tcl_AppendResult(interp, "bad 2nd pad value \"",
		Tcl_GetString(objv[1]),
		"\": must be positive screen distance", NULL);
	return TCL_ERROR;
    }

    /*
     * Write the parsed bits back into the receiving variables.
     */

  done:
    if (halfPtr != 0) {
	*halfPtr = firstInt;
    }
    *allPtr = firstInt + secondInt;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TkRegisterObjTypes --
 *
 *	Registers Tk's Tcl_ObjType structures with the Tcl run-time.
 *
 * Results:
 *	None
 *
 * Side effects:
 *	All instances of Tcl_ObjType structues used in Tk are registered with
 *	Tcl.
 *
 *----------------------------------------------------------------------
 */

void
TkRegisterObjTypes(void)
{
    Tcl_RegisterObjType(&tkBorderObjType);
    Tcl_RegisterObjType(&tkBitmapObjType);
    Tcl_RegisterObjType(&tkColorObjType);
    Tcl_RegisterObjType(&tkCursorObjType);
    Tcl_RegisterObjType(&tkFontObjType);
    Tcl_RegisterObjType(&mmObjType);
    Tcl_RegisterObjType(&tkOptionObjType);
    Tcl_RegisterObjType(&pixelObjType);
    Tcl_RegisterObjType(&tkStateKeyObjType);
    Tcl_RegisterObjType(&windowObjType);
    Tcl_RegisterObjType(&tkTextIndexType);
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */