summaryrefslogtreecommitdiffstats
path: root/mac/tkMacFont.c
blob: 616034e7584c2043aa67f19f1a651e1e0fd4e127 (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
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
/* 
 * tkMacFont.c --
 *
 *	Contains the Macintosh implementation of the platform-independant
 *	font package interface.
 *
 * 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.
 *
 * SCCS: @(#) tkMacFont.c 1.54 97/11/26 10:51:12
 */
 
#include <Windows.h>
#include <Strings.h>
#include <Fonts.h>
#include <Script.h>
#include <Resources.h>
#include <TextUtils.h>

#include "tkMacInt.h"
#include "tkFont.h"

/*
 * For doing things with Mac strings and Fixed numbers.  This probably should move 
 * the mac header file.
 */

#ifndef StrLength
#define StrLength(s) 		(*((unsigned char *) (s)))
#endif
#ifndef StrBody
#define StrBody(s)		((char *) (s) + 1)
#endif
#define pstrcmp(s1, s2)		RelString((s1), (s2), 1, 1)
#define pstrcasecmp(s1, s2)	RelString((s1), (s2), 0, 1)

#ifndef Fixed2Int
#define Fixed2Int(f)	((f) >> 16)
#define Int2Fixed(i)	((i) << 16)
#endif

/*
 * The preferred font encodings.
 */

static CONST char *encodingList[] = {
    "macRoman", "macJapan", NULL
};

/*
 * The following structures are used to map the script/language codes of a 
 * font to the name that should be passed to Tcl_GetTextEncoding() to obtain
 * the encoding for that font.  The set of numeric constants is fixed and 
 * defined by Apple.
 */
 
static TkStateMap scriptMap[] = {
    {smRoman,		"macRoman"},
    {smJapanese,	"macJapan"},
    {smTradChinese,	"macChinese"},
    {smKorean,		"macKorean"},
    {smArabic,		"macArabic"},
    {smHebrew,		"macHebrew"},
    {smGreek,		"macGreek"},
    {smCyrillic,	"macCyrillic"},
    {smRSymbol,		"macRSymbol"},
    {smDevanagari,	"macDevanagari"},
    {smGurmukhi,	"macGurmukhi"},
    {smGujarati,	"macGujarati"},
    {smOriya,		"macOriya"},
    {smBengali,		"macBengali"},
    {smTamil,		"macTamil"},
    {smTelugu,		"macTelugu"},
    {smKannada,		"macKannada"},
    {smMalayalam,	"macMalayalam"},
    {smSinhalese,	"macSinhalese"},
    {smBurmese,		"macBurmese"},
    {smKhmer,		"macKhmer"},
    {smThai,		"macThailand"},
    {smLaotian,		"macLaos"},
    {smGeorgian,	"macGeorgia"},
    {smArmenian,	"macArmenia"},
    {smSimpChinese,	"macSimpChinese"},
    {smTibetan,		"macTIbet"},
    {smMongolian,	"macMongolia"},
    {smGeez,		"macEthiopia"},
    {smEastEurRoman,	"macCentEuro"},
    {smVietnamese,	"macVietnam"},
    {smExtArabic,	"macSindhi"},
    {NULL,		NULL}
};    

static TkStateMap romanMap[] = {
    {langCroatian,	"macCroatian"},
    {langSlovenian,	"macCroatian"},
    {langIcelandic,	"macIceland"},
    {langRomanian,	"macRomania"},
    {langTurkish,	"macTurkish"},
    {langGreek,		"macGreek"},
    {NULL,		NULL}
};

static TkStateMap cyrillicMap[] = {
    {langUkrainian,	"macUkraine"},
    {langBulgarian,	"macBulgaria"},
    {NULL,		NULL}
};

/*
 * The following structure represents a font family.  It is assumed that
 * all screen fonts constructed from the same "font family" share certain
 * properties; all screen fonts with the same "font family" point to a
 * shared instance of this structure.  The most important shared property
 * is the character existence metrics, used to determine if a screen font
 * can display a given Unicode character.
 *
 * Under Macintosh, a "font family" is uniquely identified by its face number.
 */


#define FONTMAP_SHIFT	    	10

#define FONTMAP_PAGES	    	(1 << (sizeof(Tcl_UniChar) * 8 - FONTMAP_SHIFT))
#define FONTMAP_BITSPERPAGE	(1 << FONTMAP_SHIFT)

typedef struct FontFamily {
    struct FontFamily *nextPtr;	/* Next in list of all known font families. */
    int refCount;		/* How many SubFonts are referring to this
				 * FontFamily.  When the refCount drops to
				 * zero, this FontFamily may be freed. */
    /*
     * Key.
     */

    short faceNum;		/* Unique face number key for this FontFamily. */
    
    /*
     * Derived properties.
     */
     
    Tcl_Encoding encoding;	/* Encoding for this font family. */
    int isSymbolFont;		/* Non-zero if this is a symbol family. */
    int isMultiByteFont;	/* Non-zero if this is a multi-byte family. */
    char typeTable[256];	/* Table that identfies all lead bytes for a
    				 * multi-byte family, used when measuring chars.
    				 * If a byte is a lead byte, the value at the 
    				 * corresponding position in the typeTable is 1, 
    				 * otherwise 0.  If this is a single-byte font, 
    				 * all entries are 0. */
    char *fontMap[FONTMAP_PAGES];
    				/* Two-level sparse table used to determine
				 * quickly if the specified character exists.
				 * As characters are encountered, more pages
				 * in this table are dynamically added.  The
				 * contents of each page is a bitmask
				 * consisting of FONTMAP_BITSPERPAGE bits,
				 * representing whether this font can be used
				 * to display the given character at the
				 * corresponding bit position.  The high bits
				 * of the character are used to pick which
				 * page of the table is used. */
} FontFamily;

/*
 * The following structure encapsulates an individual screen font.  A font
 * object is made up of however many SubFonts are necessary to display a
 * stream of multilingual characters.
 */

typedef struct SubFont {
    char **fontMap;		/* Pointer to font map from the FontFamily, 
				 * cached here to save a dereference. */
    FontFamily *familyPtr;	/* The FontFamily for this SubFont. */
} SubFont;

/*
 * The following structure represents Macintosh's implementation of a font
 * object.
 */

#define SUBFONT_SPACE		3

typedef struct MacFont {
    TkFont font;		/* Stuff used by generic font package.  Must
				 * be first in structure. */
    SubFont staticSubFonts[SUBFONT_SPACE];
				/* Builtin space for a limited number of
				 * SubFonts. */
    int numSubFonts;		/* Length of following array. */
    SubFont *subFontArray;	/* Array of SubFonts that have been loaded
				 * in order to draw/measure all the characters
				 * encountered by this font so far.  All fonts
				 * start off with one SubFont initialized by
				 * AllocFont() from the original set of font
				 * attributes.  Usually points to
				 * staticSubFonts, but may point to malloced
				 * space if there are lots of SubFonts. */

    short size;			/* Font size in pixels, constructed from
				 * font attributes. */
    short style;		/* Style bits, constructed from font
				 * attributes. */
} MacFont;

/*
 * The following structure is used to map between the UTF-8 name for a font and
 * the name that the Macintosh uses to refer to the font, in order to determine
 * if a font exists.  The Macintosh names for fonts are stored in the encoding 
 * of the font itself.
 */
 
typedef struct FontNameMap {
    Tk_Uid utfName;		/* The name of the font in UTF-8. */
    StringPtr nativeName;	/* The name of the font in the font's encoding. */
    short faceNum;		/* Unique face number for this font. */
} FontNameMap;

/*
 * The list of font families that are currently loaded.  As screen fonts
 * are loaded, this list grows to hold information about what characters
 * exist in each font family.
 */

static FontFamily *fontFamilyList = NULL;

/*
 * Information cached about the system at startup time.
 */
 
static FontNameMap *gFontNameMap = NULL;
static GWorldPtr gWorld = NULL;

/*
 * Procedures used only in this file.
 */

static FontFamily *	AllocFontFamily(CONST MacFont *fontPtr, int family);
static SubFont *	CanUseFallback(MacFont *fontPtr,
			    CONST char *fallbackName, int ch);
static SubFont *	CanUseFallbackWithAliases(MacFont *fontPtr, 
			    char *faceName, int ch, Tcl_DString *nameTriedPtr);
static SubFont *	FindSubFontForChar(MacFont *fontPtr, int ch);
static void		FontMapInsert(SubFont *subFontPtr, int ch);
static void		FontMapLoadPage(SubFont *subFontPtr, int row);
static int		FontMapLookup(SubFont *subFontPtr, int ch);
static void 		FreeFontFamily(FontFamily *familyPtr);
static void		InitFont(Tk_Window tkwin, int family, int size, 
			    int style, MacFont *fontPtr);
static void		InitSubFont(CONST MacFont *fontPtr, int family, 
			    SubFont *subFontPtr);
static void		MultiFontDrawText(MacFont *fontPtr,
			    CONST char *source, int numBytes, int x, int y);
static void		ReleaseFont(MacFont *fontPtr);
static void		ReleaseSubFont(SubFont *subFontPtr);
static int		SeenName(CONST char *name, Tcl_DString *dsPtr);

static char *      	BreakLine(FontFamily *familyPtr, int flags, 
			    CONST char *source, int numBytes, int *widthPtr);
static int		GetFamilyNum(CONST char *faceName, short *familyPtr);
static int		GetFamilyOrAliasNum(CONST char *faceName, 
			    short *familyPtr);
static Tcl_Encoding	GetFontEncoding(int faceNum, int allowSymbol,
			    int *isSymbolPtr);
static Tk_Uid		GetUtfFaceName(StringPtr faceNameStr);


/*
 *-------------------------------------------------------------------------
 * 
 * TkpFontPkgInit --
 *
 *	This procedure is called when an application is created.  It
 *	initializes all the structures that are used by the 
 *	platform-dependant code on a per application basis.
 *
 * Results:
 *	None.  
 *
 * Side effects:
 *	See comments below.
 *
 *-------------------------------------------------------------------------
 */

void
TkpFontPkgInit(mainPtr)
    TkMainInfo *mainPtr;	/* The application being created. */
{
    MenuHandle fontMenu;
    FontNameMap *tmpFontNameMap, *newFontNameMap, *mapPtr;
    int i, j, numFonts, fontMapOffset, isSymbol;
    Str255 nativeName;
    Tcl_DString ds;
    Tcl_Encoding encoding;
    Tcl_Encoding *encodings;
    
    if (gWorld == NULL) {
	/* 
	 * Do the following one time only.
	 */

	Rect rect = {0, 0, 1, 1};

	SetFractEnable(0);
	
	/*
	 * Used for saving and restoring state while drawing and measuring.
	 */
	 
	if (NewGWorld(&gWorld, 0, &rect, NULL, NULL, 0) != noErr) {
	    panic("TkpFontPkgInit: NewGWorld failed");
	}
	
	/*
	 * The name of each font is stored in the encoding of that font.
	 * How would we translate a name from UTF-8 into the native encoding
	 * of the font unless we knew the encoding of that font?  We can't.
	 * So, precompute the UTF-8 and native names of all fonts on the 
	 * system.  The when the user asks for font by its UTF-8 name, we
	 * lookup the name in that table and really ask for the font by its
	 * native name.  Any unknown UTF-8 names will be mapped to the system 
	 * font.
	 */
	
	fontMenu = NewMenu('FT', "\px");
	AddResMenu(fontMenu, 'FONT');
	
	numFonts = CountMItems(fontMenu);
	tmpFontNameMap = (FontNameMap *) ckalloc(sizeof(FontNameMap) * numFonts);
	encodings = (Tcl_Encoding *) ckalloc(sizeof(Tcl_Encoding) * numFonts);

	mapPtr = tmpFontNameMap;
	for (i = 0; i < numFonts; i++) {
       	    GetMenuItemText(fontMenu, i + 1, nativeName);
       	    GetFNum(nativeName, &mapPtr->faceNum);
       	    encodings[i] = GetFontEncoding(mapPtr->faceNum, 0, &isSymbol);
       	    Tcl_ExternalToUtfDString(encodings[i], StrBody(nativeName), 
       	    	    StrLength(nativeName), &ds);
       	    mapPtr->utfName = Tk_GetUid(Tcl_DStringValue(&ds));
       	    mapPtr->nativeName = (StringPtr) ckalloc(StrLength(nativeName) + 1);
       	    memcpy(mapPtr->nativeName, nativeName, StrLength(nativeName) + 1);
       	    Tcl_DStringFree(&ds);
       	    mapPtr++;
       	}
       	DisposeMenu(fontMenu);
       	
       	/*
       	 * Reorder FontNameMap so fonts with the preferred encodings are at 
       	 * the front of the list.  The relative order of fonts that all have
       	 * the same encoding is preserved.  Fonts with unknown encodings get
       	 * stuck at the end.
       	 */
       	 
       	newFontNameMap = (FontNameMap *) ckalloc(sizeof(FontNameMap) * (numFonts + 1));
       	fontMapOffset = 0;
       	for (i = 0; encodingList[i] != NULL; i++) {
       	    encoding = Tcl_GetEncoding(NULL, encodingList[i]);
       	    if (encoding == NULL) {
       	    	continue;
       	    }
       	    for (j = 0; j < numFonts; j++) {
       	    	if (encodings[j] == encoding) {
       	    	    newFontNameMap[fontMapOffset] = tmpFontNameMap[j];
       	    	    fontMapOffset++;
       	    	    Tcl_FreeEncoding(encodings[j]);
       	    	    tmpFontNameMap[j].utfName = NULL;
       	    	}
       	    }
       	    Tcl_FreeEncoding(encoding);
       	} 
       	for (i = 0; i < numFonts; i++) {
       	    if (tmpFontNameMap[i].utfName != NULL) {
       	        newFontNameMap[fontMapOffset] = tmpFontNameMap[i];
       	        fontMapOffset++;
       	        Tcl_FreeEncoding(encodings[i]);
       	    }
       	}
       	if (fontMapOffset != numFonts) {
       	    panic("TkpFontPkgInit: unexpected number of fonts");
       	}

       	mapPtr = &newFontNameMap[numFonts];
       	mapPtr->utfName = NULL;
       	mapPtr->nativeName = NULL;
       	mapPtr->faceNum = 0;

       	ckfree((char *) tmpFontNameMap);
       	ckfree((char *) encodings);
       	
       	gFontNameMap = newFontNameMap;
    }       	    
}

/*
 *---------------------------------------------------------------------------
 *
 * TkpGetNativeFont --
 *
 *	Map a platform-specific native font name to a TkFont.
 *
 * Results:
 * 	The return value is a pointer to a TkFont that represents the
 *	native font.  If a native font by the given name could not be
 *	found, the return value is NULL.  
 *
 *	Every call to this procedure returns a new TkFont structure,
 *	even if the name has already been seen before.  The caller should
 *	call TkpDeleteFont() when the font is no longer needed.
 *
 *	The caller is responsible for initializing the memory associated
 *	with the generic TkFont when this function returns and releasing
 *	the contents of the generics TkFont before calling TkpDeleteFont().
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

TkFont *
TkpGetNativeFont(
    Tk_Window tkwin,	/* For display where font will be used. */
    CONST char *name)	/* Platform-specific font name. */
{
    short family;
    MacFont *fontPtr;
    
    if (strcmp(name, "system") == 0) {
	family = GetSysFont();
    } else if (strcmp(name, "application") == 0) {
	family = GetAppFont();
    } else {
	return NULL;
    }
    
    fontPtr = (MacFont *) ckalloc(sizeof(MacFont));
    InitFont(tkwin, family, 0, 0, fontPtr);
    
    return (TkFont *) fontPtr;
}

/*
 *---------------------------------------------------------------------------
 *
 * TkpGetFontFromAttributes -- 
 *
 *	Given a desired set of attributes for a font, find a font with
 *	the closest matching attributes.
 *
 * Results:
 * 	The return value is a pointer to a TkFont that represents the
 *	font with the desired attributes.  If a font with the desired
 *	attributes could not be constructed, some other font will be
 *	substituted automatically.
 *
 *	Every call to this procedure returns a new TkFont structure,
 *	even if the specified attributes have already been seen before.
 *	The caller should call TkpDeleteFont() to free the platform-
 *	specific data when the font is no longer needed.  
 *
 *	The caller is responsible for initializing the memory associated
 *	with the generic TkFont when this function returns and releasing
 *	the contents of the generic TkFont before calling TkpDeleteFont().
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */
TkFont *
TkpGetFontFromAttributes(
    TkFont *tkFontPtr,		/* If non-NULL, store the information in
				 * this existing TkFont structure, rather than
				 * allocating a new structure to hold the
				 * font; the existing contents of the font
				 * will be released.  If NULL, a new TkFont
				 * structure is allocated. */
    Tk_Window tkwin,		/* For display where font will be used. */
    CONST TkFontAttributes *faPtr)
				/* Set of attributes to match. */
{
    short faceNum, style;
    int i, j;
    char *faceName, *fallback;
    char ***fallbacks;
    MacFont *fontPtr;
        
    /*
     * Algorithm to get the closest font to the one requested.
     *
     * try fontname
     * try all aliases for fontname
     * foreach fallback for fontname
     *	    try the fallback
     *	    try all aliases for the fallback
     */
     
    faceNum = 0;
    faceName = faPtr->family;
    if (faceName != NULL) {
        if (GetFamilyOrAliasNum(faceName, &faceNum) != 0) {
            goto found;
        }
        fallbacks = TkFontGetFallbacks();
	for (i = 0; fallbacks[i] != NULL; i++) {
	    for (j = 0; (fallback = fallbacks[i][j]) != NULL; j++) {
		if (strcasecmp(faceName, fallback) == 0) {
		    for (j = 0; (fallback = fallbacks[i][j]) != NULL; j++) {
		        if (GetFamilyOrAliasNum(fallback, &faceNum)) {
		            goto found;
		        }
		    }
		}
		break;
	    }
	}
    }
    
    found:    
    style = 0;
    if (faPtr->weight != TK_FW_NORMAL) {
	style |= bold;
    }
    if (faPtr->slant != TK_FS_ROMAN) {
	style |= italic;
    }
    if (faPtr->underline) {
	style |= underline;
    }
    if (tkFontPtr == NULL) {
	fontPtr = (MacFont *) ckalloc(sizeof(MacFont));
    } else {
	fontPtr = (MacFont *) tkFontPtr;
	ReleaseFont(fontPtr);
    }
    InitFont(tkwin, faceNum, faPtr->size, style, fontPtr);
    
    return (TkFont *) fontPtr;
}

/*
 *---------------------------------------------------------------------------
 *
 * TkpDeleteFont --
 *
 *	Called to release a font allocated by TkpGetNativeFont() or
 *	TkpGetFontFromAttributes().  The caller should have already
 *	released the fields of the TkFont that are used exclusively by
 *	the generic TkFont code.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	TkFont is deallocated.
 *
 *---------------------------------------------------------------------------
 */

void
TkpDeleteFont(
    TkFont *tkFontPtr)		/* Token of font to be deleted. */
{
    MacFont *fontPtr;
    
    fontPtr = (MacFont *) tkFontPtr;
    ReleaseFont(fontPtr);
}

/*
 *---------------------------------------------------------------------------
 *
 * TkpGetFontFamilies --
 *
 *	Return information about the font families that are available
 *	on the display of the given window.
 *
 * Results:
 *	Modifies interp's result object to hold a list of all the available
 *	font families.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */
 
void
TkpGetFontFamilies(
    Tcl_Interp *interp,		/* Interp to hold result. */
    Tk_Window tkwin)		/* For display to query. */
{    
    FontNameMap *mapPtr;
    Tcl_Obj *resultPtr, *strPtr;
        
    resultPtr = Tcl_GetObjResult(interp);
    for (mapPtr = gFontNameMap; mapPtr->utfName != NULL; mapPtr++) {
        strPtr = Tcl_NewStringObj(mapPtr->utfName, -1);
        Tcl_ListObjAppendElement(NULL, resultPtr, strPtr);
    }
}

/*
 *-------------------------------------------------------------------------
 *
 * TkpGetSubFonts --
 *
 *	A function used by the testing package for querying the actual 
 *	screen fonts that make up a font object.
 *
 * Results:
 *	Modifies interp's result object to hold a list containing the 
 *	names of the screen fonts that make up the given font object.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------------
 */
	
void
TkpGetSubFonts(interp, tkfont)
    Tcl_Interp *interp;		/* Interp to hold result. */
    Tk_Font tkfont;		/* Font object to query. */
{
    int i;
    Tcl_Obj *resultPtr, *strPtr;
    MacFont *fontPtr;
    FontFamily *familyPtr;
    Str255 nativeName;

    resultPtr = Tcl_GetObjResult(interp);    
    fontPtr = (MacFont *) tkfont;
    for (i = 0; i < fontPtr->numSubFonts; i++) {
	familyPtr = fontPtr->subFontArray[i].familyPtr;
    	GetFontName(familyPtr->faceNum, nativeName);
	strPtr = Tcl_NewStringObj(GetUtfFaceName(nativeName), -1);
	Tcl_ListObjAppendElement(NULL, resultPtr, strPtr);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 *  Tk_MeasureChars --
 *
 *	Determine the number of characters from the string that will fit
 *	in the given horizontal span.  The measurement is done under the
 *	assumption that Tk_DrawChars() will be used to actually display
 *	the characters.
 *
 * Results:
 *	The return value is the number of characters from source that
 *	fit into the span that extends from 0 to maxLength.  *lengthPtr is
 *	filled with the x-coordinate of the right edge of the last
 *	character that did fit.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
Tk_MeasureChars(
    Tk_Font tkfont,		/* Font in which characters will be drawn. */
    CONST char *source,		/* UTF-8 string to be displayed.  Need not be
				 * '\0' terminated. */
    int numBytes,		/* Maximum number of bytes to consider
				 * from source string. */
    int maxLength,		/* If >= 0, maxLength specifies the longest
				 * permissible line length; don't consider any
				 * character that would cross this
				 * x-position.  If < 0, then line length is
				 * unbounded and the flags argument is
				 * ignored. */
    int flags,			/* Various flag bits OR-ed together:
				 * TK_PARTIAL_OK means include the last char
				 * which only partially fit on this line.
				 * TK_WHOLE_WORDS means stop on a word
				 * boundary, if possible.
				 * TK_AT_LEAST_ONE means return at least one
				 * character even if no characters fit. */
    int *lengthPtr)		/* Filled with x-location just after the
				 * terminating character. */
{
    MacFont *fontPtr;
    FontFamily *lastFamilyPtr;
    CGrafPtr saveWorld;
    GDHandle saveDevice;
    int curX, curByte;

    /*
     * According to "Inside Macintosh: Text", the Macintosh may
     * automatically substitute
     * ligatures or context-sensitive presentation forms when
     * measuring/displaying text within a font run.  We cannot safely
     * measure individual characters and add up the widths w/o errors.
     * However, if we convert a range of text from UTF-8 to, say,
     * Shift-JIS, and get the offset into the Shift-JIS string as to
     * where a word or line break would occur, then can we map that
     * number back to UTF-8?
     */
     
    fontPtr = (MacFont *) tkfont;

    GetGWorld(&saveWorld, &saveDevice);
    SetGWorld(gWorld, NULL);
    
    TextSize(fontPtr->size);
    TextFace(fontPtr->style);

    lastFamilyPtr = fontPtr->subFontArray[0].familyPtr; 
    
    if (numBytes == 0) {
    	curX = 0;
    	curByte = 0;
    } else if (maxLength < 0) {
    	CONST char *p, *end, *next;
    	Tcl_UniChar ch;
    	FontFamily *thisFamilyPtr;
    	Tcl_DString runString;
    	 
    	/*
    	 * A three step process:
    	 * 1. Find a contiguous range of characters that can all be 
    	 *    represented by a single screen font.
    	 * 2. Convert those chars to the encoding of that font.
	 * 3. Measure converted chars.
    	 */
    	 
        curX = 0;
        end = source + numBytes;
        for (p = source; p < end; ) {
            next = p + Tcl_UtfToUniChar(p, &ch);
            thisFamilyPtr = FindSubFontForChar(fontPtr, ch)->familyPtr;
            if (thisFamilyPtr != lastFamilyPtr) {
                TextFont(lastFamilyPtr->faceNum);
                Tcl_UtfToExternalDString(lastFamilyPtr->encoding, source, 
                	p - source, &runString);
                curX += TextWidth(Tcl_DStringValue(&runString), 0, 
                	Tcl_DStringLength(&runString));
                Tcl_DStringFree(&runString);
                lastFamilyPtr = thisFamilyPtr;
                source = p;
            }
            p = next;
        }
	TextFont(lastFamilyPtr->faceNum);
        Tcl_UtfToExternalDString(lastFamilyPtr->encoding, source, p - source, 
        	&runString);
        curX += TextWidth(Tcl_DStringValue(&runString), 0, 
        	Tcl_DStringLength(&runString));
        Tcl_DStringFree(&runString);
	curByte = numBytes;
    } else {
        CONST char *p, *end, *next, *sourceOrig;
        int widthLeft;
        FontFamily *thisFamilyPtr;
        Tcl_UniChar ch;
        char *rest;
        
	/*
	 * How many chars will fit in the space allotted? 
	 */
	
	if (maxLength > 32767) {
            maxLength = 32767;
        }
        
        widthLeft = maxLength; 
        sourceOrig = source;
        end = source + numBytes;      
	for (p = source; p < end; p = next) {
	    next = p + Tcl_UtfToUniChar(p, &ch);
  	    thisFamilyPtr = FindSubFontForChar(fontPtr, ch)->familyPtr;
  	    if (thisFamilyPtr != lastFamilyPtr) {
  	        if (p > source) {
  	            rest = BreakLine(lastFamilyPtr, flags, source, 
  	            	    p - source, &widthLeft);
  	            flags &= ~TK_AT_LEAST_ONE;
  	            if (rest != NULL) {
  	                p = source;
  	                break;
  	            }
  	        }
                lastFamilyPtr = thisFamilyPtr;
                source = p;
            }
        }
        
        if (p > source) {
            rest = BreakLine(lastFamilyPtr, flags, source, p - source, 
            	    &widthLeft);
        }
        
        if (rest == NULL) {
            curByte = numBytes;
        } else {
            curByte = rest - sourceOrig;
        }
        curX = maxLength - widthLeft;
    }

    SetGWorld(saveWorld, saveDevice);

    *lengthPtr = curX;
    return curByte;
}

/*
 *---------------------------------------------------------------------------
 *
 * BreakLine --
 *
 *	Determine where the given line of text should be broken so that it
 *	fits in the specified range.  Before calling this function, the 
 *	font values and graphics port must be set.
 *
 * Results:
 *	The return value is NULL if the specified range is larger that the
 *	space the text needs, and *widthLeftPtr is filled with how much 
 *	space is left in the range after measuring the whole text buffer.
 *	Otherwise, the return value is a pointer into the text buffer that 
 *	indicates where the line should be broken (up to, but not including 
 *	that character), and *widthLeftPtr is filled with how much space is 
 *	left in the range after measuring up to that character.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */
 
static char *      	
BreakLine(
    FontFamily *familyPtr,	/* FontFamily that describes the font values
    				 * that are already selected into the graphics
    				 * port. */
    int flags,			/* Various flag bits OR-ed together:
				 * TK_PARTIAL_OK means include the last char
				 * which only partially fit on this line.
				 * TK_WHOLE_WORDS means stop on a word
				 * boundary, if possible.
				 * TK_AT_LEAST_ONE means return at least one
				 * character even if no characters fit. */				 
    CONST char *source,		/* UTF-8 string to be displayed.  Need not be
				 * '\0' terminated. */
    int numBytes,		/* Maximum number of bytes to consider
				 * from source string. */
    int *widthLeftPtr) 		/* On input, specifies size of range into 
    				 * which characters from source buffer should
    				 * be fit.  On output, filled with how much
    				 * space is left after fitting as many 
    				 * characters as possible into the range. 
    				 * Result may be negative if TK_AT_LEAST_ONE
    				 * was specified in the flags argument. */
{
    Fixed pixelWidth, widthLeft;
    StyledLineBreakCode breakCode;
    Tcl_DString runString;
    long textOffset;
    Boolean leadingEdge;
    Point point;
    int charOffset, thisCharWasDoubleByte;
    char *p, *end, *typeTable;
    
    TextFont(familyPtr->faceNum);
    Tcl_UtfToExternalDString(familyPtr->encoding, source, numBytes,
    	    &runString);
    pixelWidth = Int2Fixed(*widthLeftPtr) + 1;
    if (flags & TK_WHOLE_WORDS) {
        textOffset = (flags & TK_AT_LEAST_ONE);  
        widthLeft = pixelWidth;
	breakCode = StyledLineBreak(Tcl_DStringValue(&runString),
		Tcl_DStringLength(&runString), 0, Tcl_DStringLength(&runString), 
		0, &widthLeft, &textOffset);
        if (breakCode != smBreakOverflow) {
            /* 
             * StyledLineBreak includes all the space characters at the end of 
             * line that we want to suppress.
             */
             
            textOffset = VisibleLength(Tcl_DStringValue(&runString), textOffset);
            goto getoffset;
        }
    } else {
        point.v = 1;
        point.h = 1;
	textOffset = PixelToChar(Tcl_DStringValue(&runString),
		Tcl_DStringLength(&runString), 0, pixelWidth, &leadingEdge, 
		&widthLeft, smOnlyStyleRun, point, point);        
	if (Fixed2Int(widthLeft) < 0) {
	    goto getoffset;
	}
    }
    *widthLeftPtr = Fixed2Int(widthLeft);
    Tcl_DStringFree(&runString);
    return NULL;

    /*
     * The conversion routine that converts UTF-8 to the target encoding
     * must map one UTF-8 character to exactly one encoding-specific
     * character, so that the following algorithm works:
     *  
     * 1. Get byte offset of where line should be broken.
     * 2. Get char offset corresponding to that byte offset.
     * 3. Map that char offset to byte offset in UTF-8 string.
     */ 

    getoffset:
    thisCharWasDoubleByte = 0;
    if (familyPtr->isMultiByteFont == 0) {
        charOffset = textOffset;
    } else {
        charOffset = 0;
        typeTable = familyPtr->typeTable;
        
        p = Tcl_DStringValue(&runString);
        end = p + textOffset;
        thisCharWasDoubleByte = typeTable[*((unsigned char *) p)];
        for ( ; p < end; p++) {
            thisCharWasDoubleByte = typeTable[*((unsigned char *) p)];
            p += thisCharWasDoubleByte;
            charOffset++;
        }
    }
    
    if ((flags & TK_WHOLE_WORDS) == 0) {
    	if ((flags & TK_PARTIAL_OK) && (leadingEdge != 0)) {
	    textOffset += thisCharWasDoubleByte;
	    textOffset++;
	    charOffset++;
        } else if (((flags & TK_PARTIAL_OK) == 0) && (leadingEdge == 0)) {
	    textOffset -= thisCharWasDoubleByte;
	    textOffset--;
	    charOffset--;
	}
    }
    if ((textOffset == 0) && (Tcl_DStringLength(&runString) > 0) 
    	    && (flags & TK_AT_LEAST_ONE)) {
    	p = Tcl_DStringValue(&runString);
        textOffset += familyPtr->typeTable[*((unsigned char *) p)];
        textOffset++;
        charOffset++;
    }
    *widthLeftPtr = Fixed2Int(pixelWidth) 
    	    - TextWidth(Tcl_DStringValue(&runString), 0, textOffset);
    Tcl_DStringFree(&runString);
    return Tcl_UtfAtIndex(source, charOffset);
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_DrawChars --
 *
 *	Draw a string of characters on the screen.  
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Information gets drawn on the screen.
 *
 *---------------------------------------------------------------------------
 */

void
Tk_DrawChars(
    Display *display,		/* Display on which to draw. */
    Drawable drawable,		/* Window or pixmap in which to draw. */
    GC gc,			/* Graphics context for drawing characters. */
    Tk_Font tkfont,		/* Font in which characters will be drawn;
				 * must be the same as font used in GC. */
    CONST char *source,		/* UTF-8 string to be displayed.  Need not be
				 * '\0' terminated.  All Tk meta-characters
				 * (tabs, control characters, and newlines)
				 * should be stripped out of the string that
				 * is passed to this function.  If they are
				 * not stripped out, they will be displayed as
				 * regular printing characters. */
    int numBytes,		/* Number of bytes in string. */
    int x, int y)		/* Coordinates at which to place origin of
				 * string when drawing. */
{
    MacFont *fontPtr;
    MacDrawable *macWin;
    RGBColor macColor, origColor;
    GWorldPtr destPort;
    CGrafPtr saveWorld;
    GDHandle saveDevice;
    short txFont, txFace, txSize;
    BitMapPtr stippleMap;

    fontPtr = (MacFont *) tkfont;
    macWin = (MacDrawable *) drawable;

    destPort = TkMacGetDrawablePort(drawable);
    GetGWorld(&saveWorld, &saveDevice);
    SetGWorld(destPort, NULL);
    
    TkMacSetUpClippingRgn(drawable);
    TkMacSetUpGraphicsPort(gc);
    
    txFont = tcl_macQdPtr->thePort->txFont;
    txFace = tcl_macQdPtr->thePort->txFace;
    txSize = tcl_macQdPtr->thePort->txSize;
    GetForeColor(&origColor);
    
    if ((gc->fill_style == FillStippled
	    || gc->fill_style == FillOpaqueStippled)
	    && gc->stipple != None) {
	Pixmap pixmap;
	GWorldPtr bufferPort;
	
	stippleMap = TkMacMakeStippleMap(drawable, gc->stipple);

	pixmap = Tk_GetPixmap(display, drawable, 	
		stippleMap->bounds.right, stippleMap->bounds.bottom, 0);
		
	bufferPort = TkMacGetDrawablePort(pixmap);
	SetGWorld(bufferPort, NULL);
	
	if (TkSetMacColor(gc->foreground, &macColor) == true) {
	    RGBForeColor(&macColor);
	}
	ShowPen();
	FillRect(&stippleMap->bounds, &tcl_macQdPtr->white);
	MultiFontDrawText(fontPtr, source, numBytes, 0, 0);

	SetGWorld(destPort, NULL);
	CopyDeepMask(&((GrafPtr) bufferPort)->portBits, stippleMap, 
		&((GrafPtr) destPort)->portBits, &stippleMap->bounds,
		&stippleMap->bounds, &((GrafPtr) destPort)->portRect,
		srcOr, NULL);
	
	/* TODO: this doesn't work quite right - it does a blend.   you can't
	 * draw white text when you have a stipple.
	 */
		
	Tk_FreePixmap(display, pixmap);
	ckfree(stippleMap->baseAddr);
	ckfree((char *)stippleMap);
    } else {	
	if (TkSetMacColor(gc->foreground, &macColor) == true) {
	    RGBForeColor(&macColor);
	}
	ShowPen();
	MultiFontDrawText(fontPtr, source, numBytes, macWin->xOff + x,
		macWin->yOff + y);
    }

    TextFont(txFont);
    TextSize(txSize);
    TextFace(txFace);
    RGBForeColor(&origColor);
    SetGWorld(saveWorld, saveDevice);
}

/*
 *-------------------------------------------------------------------------
 *
 * MultiFontDrawText --
 *
 *	Helper function for Tk_DrawChars.  Draws characters, using the 
 *	various screen fonts in fontPtr to draw multilingual characters.
 *	Note: No bidirectional support.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Information gets drawn on the screen.  
 *	Contents of fontPtr may be modified if more subfonts were loaded 
 *	in order to draw all the multilingual characters in the given 
 *	string.
 *
 *-------------------------------------------------------------------------
 */

static void
MultiFontDrawText(
    MacFont *fontPtr,		/* Contains set of fonts to use when drawing
				 * following string. */
    CONST char *source,		/* Potentially multilingual UTF-8 string. */
    int numBytes,		/* Length of string in bytes. */
    int x, int y)		/* Coordinates at which to place origin *
				 * of string when drawing. */
{
    FontFamily *lastFamilyPtr, *thisFamilyPtr;
    Tcl_DString runString;
    CONST char *p, *end, *next;
    Tcl_UniChar ch;
    
    TextSize(fontPtr->size);
    TextFace(fontPtr->style);

    lastFamilyPtr = fontPtr->subFontArray[0].familyPtr;
    
    end = source + numBytes;
    for (p = source; p < end; ) {
        next = p + Tcl_UtfToUniChar(p, &ch);
        thisFamilyPtr = FindSubFontForChar(fontPtr, ch)->familyPtr;
        if (thisFamilyPtr != lastFamilyPtr) {
            if (p > source) {
		TextFont(lastFamilyPtr->faceNum);
 		Tcl_UtfToExternalDString(lastFamilyPtr->encoding, source, 
		        p - source, &runString);
		MoveTo((short) x, (short) y);
		DrawText(Tcl_DStringValue(&runString), 0, 
		        Tcl_DStringLength(&runString));
		x += TextWidth(Tcl_DStringValue(&runString), 0, 
		        Tcl_DStringLength(&runString));
		Tcl_DStringFree(&runString);
                source = p;
	    }
            lastFamilyPtr = thisFamilyPtr;
        }
        p = next;
    }
    if (p > source) {
        TextFont(thisFamilyPtr->faceNum);
	Tcl_UtfToExternalDString(lastFamilyPtr->encoding, source, 
	        p - source, &runString);
	MoveTo((short) x, (short) y);
    	DrawText(Tcl_DStringValue(&runString), 0, 
	        Tcl_DStringLength(&runString));
	Tcl_DStringFree(&runString);
    }
}        

/*
 *---------------------------------------------------------------------------
 *
 * TkMacIsCharacterMissing --
 *
 *	Given a tkFont and a character determines whether the character has
 *	a glyph defined in the font or not. Note that this is potentially
 *	not compatible with Mac OS 8 as it looks at the font handle
 *	structure directly. Looks into the character array of the font
 *	handle to determine whether the glyph is defined or not.
 *
 * Results:
 *	Returns a 1 if the character is missing, a 0 if it is not.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
TkMacIsCharacterMissing(
    Tk_Font tkfont,		/* The font we are looking in. */
    unsigned int searchChar)	/* The character we are looking for. */
{
    MacFont *fontPtr = (MacFont *) tkfont;
    FMInput fm;
    FontRec **fontRecHandle;
    
    fm.family = fontPtr->subFontArray[0].familyPtr->faceNum;
    fm.size = fontPtr->size;
    fm.face = fontPtr->style;
    fm.needBits = 0;
    fm.device = 0;
    fm.numer.h = fm.numer.v = fm.denom.h = fm.denom.v = 1;
    
#if !defined(UNIVERSAL_INTERFACES_VERSION) || (UNIVERSAL_INTERFACES_VERSION < 0x0300)
    fontRecHandle = (FontRec **) FMSwapFont(&fm)->fontResult;
#else
    fontRecHandle = (FontRec **) FMSwapFont(&fm)->fontHandle;
#endif
    return *(short *) ((long) &(*fontRecHandle)->owTLoc 
    	    + ((long)((*fontRecHandle)->owTLoc + searchChar 
    	    - (*fontRecHandle)->firstChar) * sizeof(short))) == -1;
}

/*
 *---------------------------------------------------------------------------
 *
 * InitFont --
 *
 *	Helper for TkpGetNativeFont() and TkpGetFontFromAttributes().
 *	Initializes the memory for a MacFont that wraps the platform-specific
 *	data.
 *
 *	The caller is responsible for initializing the fields of the
 *	TkFont that are used exclusively by the generic TkFont code, and
 *	for releasing those fields before calling TkpDeleteFont().
 *
 * Results:
 *	Fills the MacFont structure.
 *
 * Side effects:
 *	Memory allocated.
 *
 *---------------------------------------------------------------------------
 */ 

static void
InitFont(
    Tk_Window tkwin,		/* For display where font will be used. */
    int faceNum,		/* Macintosh font number. */
    int size,			/* Point size for Macintosh font. */
    int style,			/* Macintosh style bits. */
    MacFont *fontPtr)		/* Filled with information constructed from
				 * the above arguments. */
{
    Str255 nativeName;
    FontInfo fi;
    TkFontAttributes *faPtr;
    TkFontMetrics *fmPtr;
    CGrafPtr saveWorld;
    GDHandle saveDevice;
    short pixels;

    if (size == 0) {
    	size = -GetDefFontSize();
    }
    pixels = (short) TkFontGetPixels(tkwin, size);
    
    GetGWorld(&saveWorld, &saveDevice);
    SetGWorld(gWorld, NULL);
    TextFont(faceNum);
    TextSize(pixels);
    TextFace(style);

    GetFontInfo(&fi);
    GetFontName(faceNum, nativeName);

    fontPtr->font.fid	= (Font) fontPtr;

    faPtr 		= &fontPtr->font.fa;
    faPtr->family	= GetUtfFaceName(nativeName);
    faPtr->size		= TkFontGetPoints(tkwin, size);
    faPtr->weight	= (style & bold) ? TK_FW_BOLD : TK_FW_NORMAL;
    faPtr->slant	= (style & italic) ? TK_FS_ITALIC : TK_FS_ROMAN;
    faPtr->underline	= ((style & underline) != 0);
    faPtr->overstrike	= 0;

    fmPtr 		= &fontPtr->font.fm;
    fmPtr->ascent	= fi.ascent;	
    fmPtr->descent	= fi.descent;	
    fmPtr->maxWidth	= fi.widMax;
    fmPtr->fixed	= (CharWidth('i') == CharWidth('w'));
    
    fontPtr->size	= pixels;
    fontPtr->style	= (short) style;
        
    fontPtr->numSubFonts 	= 1;
    fontPtr->subFontArray	= fontPtr->staticSubFonts;
    InitSubFont(fontPtr, faceNum, &fontPtr->subFontArray[0]);

    SetGWorld(saveWorld, saveDevice);
}

/*
 *-------------------------------------------------------------------------
 *
 * ReleaseFont --
 * 
 *	Called to release the Macintosh-specific contents of a TkFont.
 *	The caller is responsible for freeing the memory used by the
 *	font itself.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Memory is freed.
 *
 *---------------------------------------------------------------------------
 */
 
static void
ReleaseFont(
    MacFont *fontPtr)		/* The font to delete. */
{
    int i;

    for (i = 0; i < fontPtr->numSubFonts; i++) {
	ReleaseSubFont(&fontPtr->subFontArray[i]);
    }
    if (fontPtr->subFontArray != fontPtr->staticSubFonts) {
	ckfree((char *) fontPtr->subFontArray);
    }
}

/*
 *-------------------------------------------------------------------------
 *
 * InitSubFont --
 *
 *	Wrap a screen font and load the FontFamily that represents
 *	it.  Used to prepare a SubFont so that characters can be mapped
 *	from UTF-8 to the charset of the font.
 *
 * Results:
 *	The subFontPtr is filled with information about the font.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------------
 */

static void
InitSubFont(
    CONST MacFont *fontPtr,	/* Font object in which the SubFont will be
    				 * used. */
    int faceNum,		/* The font number. */
    SubFont *subFontPtr)	/* Filled with SubFont constructed from 
    				 * above attributes. */
{
    subFontPtr->familyPtr = AllocFontFamily(fontPtr, faceNum);
    subFontPtr->fontMap = subFontPtr->familyPtr->fontMap;
}

/*
 *-------------------------------------------------------------------------
 *
 * ReleaseSubFont --
 *
 *	Called to release the contents of a SubFont.  The caller is 
 *	responsible for freeing the memory used by the SubFont itself.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Memory and resources are freed.
 *
 *---------------------------------------------------------------------------
 */

static void
ReleaseSubFont(
    SubFont *subFontPtr)	/* The SubFont to delete. */
{
    FreeFontFamily(subFontPtr->familyPtr);
}

/*
 *-------------------------------------------------------------------------
 *
 * AllocFontFamily --
 *
 *	Find the FontFamily structure associated with the given font 
 *	family.  The information should be stored by the caller in a 
 *	SubFont and used when determining if that SubFont supports a 
 *	character. 
 *
 * Results:
 *	A pointer to a FontFamily.  The reference count in the FontFamily
 *	is automatically incremented.  When the SubFont is released, the
 *	reference count is decremented.  When no SubFont is using this
 *	FontFamily, it may be deleted.
 *
 * Side effects:
 *	A new FontFamily structure will be allocated if this font family
 *	has not been seen.  
 *
 *-------------------------------------------------------------------------
 */

static FontFamily *
AllocFontFamily(
    CONST MacFont *fontPtr,	/* Font object in which the FontFamily will
    				 * be used. */
    int faceNum)		/* The font number. */
{
    FontFamily *familyPtr;
    int i;
    
    familyPtr = fontFamilyList;
    for (; familyPtr != NULL; familyPtr = familyPtr->nextPtr) {
	if (familyPtr->faceNum == faceNum) {
	    familyPtr->refCount++;
	    return familyPtr;
	}
    }

    familyPtr = (FontFamily *) ckalloc(sizeof(FontFamily));
    memset(familyPtr, 0, sizeof(FontFamily));
    familyPtr->nextPtr = fontFamilyList;
    fontFamilyList = familyPtr;

    /* 
     * Set key for this FontFamily. 
     */
     
    familyPtr->faceNum = faceNum;

    /* 
     * An initial refCount of 2 means that FontFamily information will
     * persist even when the SubFont that loaded the FontFamily is released.
     * Change it to 1 to cause FontFamilies to be unloaded when not in use.
     */
     
    familyPtr->refCount = 2;
    familyPtr->encoding = GetFontEncoding(faceNum, 1, &familyPtr->isSymbolFont);
    familyPtr->isMultiByteFont = 0;
    FillParseTable(familyPtr->typeTable, FontToScript(faceNum));
    for (i = 0; i < 256; i++) {
        if (familyPtr->typeTable[i] != 0) {
            familyPtr->isMultiByteFont = 1;
            break;
        }
    }
    return familyPtr;
}

/*
 *-------------------------------------------------------------------------
 *
 * FreeFontFamily --
 *
 *	Called to free a FontFamily when the SubFont is finished using it.
 *	Frees the contents of the FontFamily and the memory used by the
 *	FontFamily itself.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------------
 */
 
static void
FreeFontFamily(
    FontFamily *familyPtr)	/* The FontFamily to delete. */
{
    FontFamily **familyPtrPtr;
    int i;

    if (familyPtr == NULL) {
        return;
    }
    familyPtr->refCount--;
    if (familyPtr->refCount > 0) {
    	return;
    }
    Tcl_FreeEncoding(familyPtr->encoding);
    for (i = 0; i < FONTMAP_PAGES; i++) {
        if (familyPtr->fontMap[i] != NULL) {
            ckfree((char *) familyPtr->fontMap[i]);
        }
    }
    
    /* 
     * Delete from list. 
     */
         
    for (familyPtrPtr = &fontFamilyList; ; ) {
        if (*familyPtrPtr == familyPtr) {
  	    *familyPtrPtr = familyPtr->nextPtr;
	    break;
	}
	familyPtrPtr = &(*familyPtrPtr)->nextPtr;
    }
    
    ckfree((char *) familyPtr);
}

/*
 *-------------------------------------------------------------------------
 *
 * FindSubFontForChar --
 *
 *	Determine which physical screen font is necessary to use to 
 *	display the given character.  If the font object does not have
 *	a screen font that can display the character, another screen font
 *	may be loaded into the font object, following a set of preferred
 *	fallback rules.
 *
 * Results:
 *	The return value is the SubFont to use to display the given 
 *	character. 
 *
 * Side effects:
 *	The contents of fontPtr are modified to cache the results
 *	of the lookup and remember any SubFonts that were dynamically 
 *	loaded.
 *
 *-------------------------------------------------------------------------
 */

static SubFont *
FindSubFontForChar(
    MacFont *fontPtr,		/* The font object with which the character
				 * will be displayed. */
    int ch)			/* The Unicode character to be displayed. */
{
    int i, j, k;
    char *fallbackName;
    char **aliases;
    SubFont *subFontPtr;
    FontNameMap *mapPtr;
    Tcl_DString faceNames;
    char ***fontFallbacks;
    char **anyFallbacks;
    
    if (FontMapLookup(&fontPtr->subFontArray[0], ch)) {
	return &fontPtr->subFontArray[0];
    }

    for (i = 1; i < fontPtr->numSubFonts; i++) {
	if (FontMapLookup(&fontPtr->subFontArray[i], ch)) {
	    return &fontPtr->subFontArray[i];
	}
    }

    /*
     * Keep track of all face names that we check, so we don't check some
     * name multiple times if it can be reached by multiple paths.
     */
     
    Tcl_DStringInit(&faceNames);
        
    aliases = TkFontGetAliasList(fontPtr->font.fa.family);

    subFontPtr = NULL;
    fontFallbacks = TkFontGetFallbacks();
    for (i = 0; fontFallbacks[i] != NULL; i++) {
	for (j = 0; fontFallbacks[i][j] != NULL; j++) {
	    fallbackName = fontFallbacks[i][j];
	    if (strcasecmp(fallbackName, fontPtr->font.fa.family) == 0) {
		/*
		 * If the base font has a fallback...
		 */

		goto tryfallbacks;
	    } else if (aliases != NULL) {
		/* 
		 * Or if an alias for the base font has a fallback...
		 */

		for (k = 0; aliases[k] != NULL; k++) {
		    if (strcasecmp(aliases[k], fallbackName) == 0) {
		        goto tryfallbacks;
		    }
		}
	    }
	}
	continue;
	    
	/* 
	 * ...then see if we can use one of the fallbacks, or an
	 * alias for one of the fallbacks.
	 */

	tryfallbacks:
	for (j = 0; fontFallbacks[i][j] != NULL; j++) {
	    fallbackName = fontFallbacks[i][j];
	    subFontPtr = CanUseFallbackWithAliases(fontPtr, fallbackName,
		    ch, &faceNames);
	    if (subFontPtr != NULL) {
		goto end;
	    }
	}
    }
    
    /*
     * See if we can use something from the global fallback list. 
     */

    anyFallbacks = TkFontGetGlobalClass();
    for (i = 0; anyFallbacks[i] != NULL; i++) {
	fallbackName = anyFallbacks[i];
	subFontPtr = CanUseFallbackWithAliases(fontPtr, fallbackName, ch,
		&faceNames);
	if (subFontPtr != NULL) {
	    goto end;
	}
    }

    /*
     * Try all face names available in the whole system until we
     * find one that can be used.
     */

    for (mapPtr = gFontNameMap; mapPtr->utfName != NULL; mapPtr++) {
        fallbackName = mapPtr->utfName;
	if (SeenName(fallbackName, &faceNames) == 0) {
	    subFontPtr = CanUseFallback(fontPtr, fallbackName, ch);
	    if (subFontPtr != NULL) {
		goto end;
	    }
	}
    }
    
    end:
    Tcl_DStringFree(&faceNames);
    
    if (subFontPtr == NULL) {
        /* 
         * No font can display this character.  We will use the base font
         * and have it display the "unknown" character.
         */

	subFontPtr = &fontPtr->subFontArray[0];
        FontMapInsert(subFontPtr, ch);
    }
    return subFontPtr;
}

/*
 *-------------------------------------------------------------------------
 *
 * FontMapLookup --
 *
 *	See if the screen font can display the given character.
 *
 * Results:
 *	The return value is 0 if the screen font cannot display the
 *	character, non-zero otherwise.
 *
 * Side effects:
 *	New pages are added to the font mapping cache whenever the
 *	character belongs to a page that hasn't been seen before.
 *	When a page is loaded, information about all the characters on
 *	that page is stored, not just for the single character in
 *	question.
 *
 *-------------------------------------------------------------------------
 */

static int
FontMapLookup(
    SubFont *subFontPtr,	/* Contains font mapping cache to be queried
				 * and possibly updated. */
    int ch)			/* Character to be tested. */
{
    int row, bitOffset;

    row = ch >> FONTMAP_SHIFT;
    if (subFontPtr->fontMap[row] == NULL) {
	FontMapLoadPage(subFontPtr, row);
    }
    bitOffset = ch & (FONTMAP_BITSPERPAGE - 1);
    return (subFontPtr->fontMap[row][bitOffset >> 3] >> (bitOffset & 7)) & 1;
}

/*
 *-------------------------------------------------------------------------
 *
 * FontMapInsert --
 *
 *	Tell the font mapping cache that the given screen font should be
 *	used to display the specified character.  This is called when no
 *	font on the system can be be found that can display that 
 *	character; we lie to the font and tell it that it can display
 *	the character, otherwise we would end up re-searching the entire
 *	fallback hierarchy every time that character was seen.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	New pages are added to the font mapping cache whenever the
 *	character belongs to a page that hasn't been seen before.
 *	When a page is loaded, information about all the characters on
 *	that page is stored, not just for the single character in
 *	question.
 *
 *-------------------------------------------------------------------------
 */

static void
FontMapInsert(
    SubFont *subFontPtr,	/* Contains font mapping cache to be 
				 * updated. */
    int ch)			/* Character to be added to cache. */
{
    int row, bitOffset;

    row = ch >> FONTMAP_SHIFT;
    if (subFontPtr->fontMap[row] == NULL) {
	FontMapLoadPage(subFontPtr, row);
    }
    bitOffset = ch & (FONTMAP_BITSPERPAGE - 1);
    subFontPtr->fontMap[row][bitOffset >> 3] |= 1 << (bitOffset & 7);
}

/*
 *-------------------------------------------------------------------------
 *
 * FontMapLoadPage --
 *
 *	Load information about all the characters on a given page.
 *	This information consists of one bit per character that indicates
 *	whether the associated HFONT can (1) or cannot (0) display the
 *	characters on the page.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Mempry allocated.
 *
 *-------------------------------------------------------------------------
 */
static void 
FontMapLoadPage(
    SubFont *subFontPtr,	/* Contains font mapping cache to be 
				 * updated. */
    int row)			/* Index of the page to be loaded into 
				 * the cache. */
{
    FMInput fm;
    FontRec *fontRecPtr;
    short *widths;
    int i, end, bitOffset, isMultiByteFont;
    char src[TCL_UTF_MAX];
    unsigned char buf[16];
    int srcRead, dstWrote;
    Tcl_Encoding encoding;
     
    subFontPtr->fontMap[row] = (char *) ckalloc(FONTMAP_BITSPERPAGE / 8);
    memset(subFontPtr->fontMap[row], 0, FONTMAP_BITSPERPAGE / 8);
    
    encoding = subFontPtr->familyPtr->encoding;
    
    fm.family 	= subFontPtr->familyPtr->faceNum;
    fm.size 	= 12;
    fm.face 	= 0;
    fm.needBits = 0;
    fm.device	= 0;
    fm.numer.h	= 1;
    fm.numer.v	= 1;
    fm.denom.h	= 1;
    fm.denom.v	= 1;
    
#if !defined(UNIVERSAL_INTERFACES_VERSION) || (UNIVERSAL_INTERFACES_VERSION < 0x0300)
    fontRecPtr = *((FontRec **) FMSwapFont(&fm)->fontResult);
#else
    fontRecPtr = *((FontRec **) FMSwapFont(&fm)->fontHandle);
#endif
    widths = (short *) ((long) &fontRecPtr->owTLoc 
    	    + ((long) (fontRecPtr->owTLoc - fontRecPtr->firstChar) 
    	    		* sizeof(short)));
    isMultiByteFont = subFontPtr->familyPtr->isMultiByteFont;
    	    		
    end = (row + 1) << FONTMAP_SHIFT;
    for (i = row << FONTMAP_SHIFT; i < end; i++) {
        if (Tcl_UtfToExternal(NULL, encoding, src, Tcl_UniCharToUtf(i, src), 
        	TCL_ENCODING_STOPONERROR, NULL, (char *) buf, sizeof(buf), 
		&srcRead, &dstWrote, NULL) == TCL_OK) {
            
            if (((isMultiByteFont != 0) && (buf[0] > 31))
            	    || (widths[buf[0]] != -1)) {
            	if ((buf[0] == 0x11) && (widths[0x12] == -1)) {
            	    continue;
            	}
            	
                /* 
                 * Mac's char existence metrics are only for one-byte
                 * characters.  If we have a double-byte char, just 
                 * assume that the font supports that char if the font's 
                 * encoding supports that char.
                 */
                
                bitOffset = i & (FONTMAP_BITSPERPAGE - 1);
		subFontPtr->fontMap[row][bitOffset >> 3] |= 1 << (bitOffset & 7);
	    }
	}
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * CanUseFallbackWithAliases --
 *
 *	Helper function for FindSubFontForChar.  Determine if the
 *	specified face name (or an alias of the specified face name)
 *	can be used to construct a screen font that can display the
 *	given character.
 *
 * Results:
 *	See CanUseFallback().
 *
 * Side effects:
 *	If the name and/or one of its aliases was rejected, the
 *	rejected string is recorded in nameTriedPtr so that it won't
 *	be tried again.
 *
 *---------------------------------------------------------------------------
 */

static SubFont *
CanUseFallbackWithAliases(
    MacFont *fontPtr,		/* The font object that will own the new
				 * screen font. */
    char *faceName,		/* Desired face name for new screen font. */
    int ch,			/* The Unicode character that the new
				 * screen font must be able to display. */
    Tcl_DString *nameTriedPtr)	/* Records face names that have already
				 * been tried.  It is possible for the same
				 * face name to be queried multiple times when
				 * trying to find a suitable screen font. */
{
    SubFont *subFontPtr;
    char **aliases;
    int i;
    
    if (SeenName(faceName, nameTriedPtr) == 0) {
	subFontPtr = CanUseFallback(fontPtr, faceName, ch);
	if (subFontPtr != NULL) {
	    return subFontPtr;
	}
    }
    aliases = TkFontGetAliasList(faceName);
    if (aliases != NULL) {
	for (i = 0; aliases[i] != NULL; i++) {
	    if (SeenName(aliases[i], nameTriedPtr) == 0) {
		subFontPtr = CanUseFallback(fontPtr, aliases[i], ch);
		if (subFontPtr != NULL) {
		    return subFontPtr;
		}
	    }
	}
    }
    return NULL;
}

/*
 *---------------------------------------------------------------------------
 *
 * SeenName --
 *
 *	Used to determine we have already tried and rejected the given
 *	face name when looking for a screen font that can support some
 *	Unicode character.
 *
 * Results:
 *	The return value is 0 if this face name has not already been seen,
 *	non-zero otherwise.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

static int
SeenName(
    CONST char *name,		/* The name to check. */
    Tcl_DString *dsPtr)		/* Contains names that have already been
				 * seen. */
{
    CONST char *seen, *end;

    seen = Tcl_DStringValue(dsPtr);
    end = seen + Tcl_DStringLength(dsPtr);
    while (seen < end) {
	if (strcasecmp(seen, name) == 0) {
	    return 1;
	}
	seen += strlen(seen) + 1;
    }
    Tcl_DStringAppend(dsPtr, (char *) name, (int) (strlen(name) + 1));
    return 0;
}

/*
 *-------------------------------------------------------------------------
 *
 * CanUseFallback --
 *
 *	If the specified physical screen font has not already been loaded 
 *	into the font object, determine if the specified physical screen 
 *	font can display the given character.
 *
 * Results:
 *	The return value is a pointer to a newly allocated SubFont, owned
 *	by the font object.  This SubFont can be used to display the given
 *	character.  The SubFont represents the screen font with the base set 
 *	of font attributes from the font object, but using the specified 
 *	font name.  NULL is returned if the font object already holds
 *	a reference to the specified physical font or if the specified 
 *	physical font cannot display the given character.
 *
 * Side effects:				       
 *	The font object's subFontArray is updated to contain a reference
 *	to the newly allocated SubFont.
 *
 *-------------------------------------------------------------------------
 */

static SubFont *
CanUseFallback(
    MacFont *fontPtr,		/* The font object that will own the new
				 * screen font. */
    CONST char *faceName,	/* Desired face name for new screen font. */
    int ch)			/* The Unicode character that the new
				 * screen font must be able to display. */
{
    int i;
    SubFont subFont;
    short faceNum;

    if (GetFamilyNum(faceName, &faceNum) == 0) {
        return NULL;
    }
    
    /* 
     * Skip all fonts we've already used.
     */
     
    for (i = 0; i < fontPtr->numSubFonts; i++) {
	if (faceNum == fontPtr->subFontArray[i].familyPtr->faceNum) {
	    return NULL;
	}
    }
    
    /*
     * Load this font and see if it has the desired character.
     */
     
    InitSubFont(fontPtr, faceNum, &subFont);
    if (((ch < 256) && (subFont.familyPtr->isSymbolFont)) 
	    || (FontMapLookup(&subFont, ch) == 0)) {
        ReleaseSubFont(&subFont);
        return NULL;
    }
    
    if (fontPtr->numSubFonts >= SUBFONT_SPACE) {
	SubFont *newPtr;
    	
    	newPtr = (SubFont *) ckalloc(sizeof(SubFont) 
		* (fontPtr->numSubFonts + 1));
	memcpy((char *) newPtr, fontPtr->subFontArray,
		fontPtr->numSubFonts * sizeof(SubFont));
	if (fontPtr->subFontArray != fontPtr->staticSubFonts) {
	    ckfree((char *) fontPtr->subFontArray);
	}
	fontPtr->subFontArray = newPtr;
    }
    fontPtr->subFontArray[fontPtr->numSubFonts] = subFont;
    fontPtr->numSubFonts++;
    return &fontPtr->subFontArray[fontPtr->numSubFonts - 1];
}

/*
 *-------------------------------------------------------------------------
 *
 * GetFamilyNum --
 *
 *	Determines if any physical screen font exists on the system with 
 *	the given family name.  If the family exists, then it should be
 *	possible to construct some physical screen font with that family
 *	name.
 *
 * Results:
 *	The return value is 0 if the specified font family does not exist,
 *	non-zero otherwise.  *faceNumPtr is filled with the unique face
 *	number that identifies the screen font, or 0 if the font family
 *	did not exist.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------------
 */

static int
GetFamilyNum(
    CONST char *faceName, 	/* UTF-8 name of font family to query. */
    short *faceNumPtr)		/* Filled with font number for above family. */
{
    FontNameMap *mapPtr;
    
    if (faceName != NULL) {
        for (mapPtr = gFontNameMap; mapPtr->utfName != NULL; mapPtr++) {
            if (strcasecmp(faceName, mapPtr->utfName) == 0) {
                *faceNumPtr = mapPtr->faceNum;
                return 1;
            }
        }
    }
    *faceNumPtr = 0;    
    return 0;
}

static int
GetFamilyOrAliasNum(
    CONST char *faceName, 	/* UTF-8 name of font family to query. */
    short *faceNumPtr)		/* Filled with font number for above family. */
{
    char **aliases;
    int i;
    
    if (GetFamilyNum(faceName, faceNumPtr) != 0) {
        return 1;
    }
    aliases = TkFontGetAliasList(faceName);
    if (aliases != NULL) {
        for (i = 0; aliases[i] != NULL; i++) {
            if (GetFamilyNum(aliases[i], faceNumPtr) != 0) {
		return 1;
	    }
	}
    }
    return 0;
}

/*
 *-------------------------------------------------------------------------
 *
 * GetUtfFaceName --
 *
 *	Given the native name for a Macintosh font (in which the name of
 *	the font is in the encoding of the font itself), return the UTF-8
 *	name that corresponds to that font.  The specified font name must
 *	refer to a font that actually exists on the machine.  
 *
 *	This function is used to obtain the UTF-8 name when querying the
 *	properties of a Macintosh font object.
 *
 * Results:
 *	The return value is a pointer to the UTF-8 of the specified font.
 *
 * Side effects:
 *	None.
 *
 *------------------------------------------------------------------------
 */
 
static Tk_Uid
GetUtfFaceName(
    StringPtr nativeName)	/* Pascal name for font in native encoding. */
{
    FontNameMap *mapPtr;
    
    for (mapPtr = gFontNameMap; mapPtr->utfName != NULL; mapPtr++) {
        if (pstrcmp(nativeName, mapPtr->nativeName) == 0) {
            return mapPtr->utfName;
        }
    }
    panic("GetUtfFaceName: unexpected nativeName");
    return NULL;
}

/*
 *------------------------------------------------------------------------
 *
 * GetFontEncoding --
 *
 *	Return a string that can be passed to Tcl_GetTextEncoding() and
 *	used to convert bytes from UTF-8 into the encoding  of the 
 *	specified font.
 *
 *	The desired encoding to use to convert the name of a symbolic 
 *	font into UTF-8 is macRoman, while the desired encoding to use
 *	to convert bytes in a symbolic font to UTF-8 is the corresponding
 *	symbolic encoding.  Due to this dual interpretatation of symbolic
 *	fonts, the caller can specify what type of encoding to return 
 *	should the specified font be symbolic.  
 *
 * Results:
 *	The return value is a string that specifies the font's encoding.
 *	If the font's encoding could not be identified, NULL is returned.
 *
 * Side effects:
 *	None.
 *
 *------------------------------------------------------------------------
 */
  
static Tcl_Encoding
GetFontEncoding(
    int faceNum,		/* Macintosh font number. */
    int allowSymbol,		/* If non-zero, then the encoding string
    				 * for symbol fonts will be the corresponding
    				 * symbol encoding.  Otherwise, the encoding
    				 * string for symbol fonts will be 
    				 * "macRoman". */
    int *isSymbolPtr)		/* Filled with non-zero if this font is a
    				 * symbol font, 0 otherwise. */
{
    Str255 faceName;
    int script, lang;
    char *name;   
    
    if (allowSymbol != 0) {
        GetFontName(faceNum, faceName);
        if (pstrcasecmp(faceName, "\psymbol") == 0) {
            *isSymbolPtr = 1;
    	    return Tcl_GetEncoding(NULL, "symbol");
        }
        if (pstrcasecmp(faceName, "\pzapf dingbats") == 0) {
            *isSymbolPtr = 1;
            return Tcl_GetEncoding(NULL, "macDingbats");
        }
    }
    
    *isSymbolPtr = 0;
    
    script = FontToScript(faceNum);
    lang = GetScriptVariable(script, smScriptLang);
    name = NULL;
    if (script == smRoman) {
        name = TkFindStateString(romanMap, lang);
    } else if (script == smCyrillic) {
    	name = TkFindStateString(cyrillicMap, lang);
    }
    if (name == NULL) {
    	name = TkFindStateString(scriptMap, script);
    }
    return Tcl_GetEncoding(NULL, name);
}