summaryrefslogtreecommitdiffstats
path: root/generic/tkFont.c
blob: 308895912965799227677f4f056aaa1492b009c3 (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
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
/*
 * tkFont.c --
 *
 *	This file maintains a database of fonts for the Tk toolkit. It also
 *	provides several utility functions for measuring and displaying text.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1998 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tkInt.h"
#include "tkFont.h"

/*
 * The following structure is used to keep track of all the fonts that exist
 * in the current application. It must be stored in the TkMainInfo for the
 * application.
 */

typedef struct TkFontInfo {
    Tcl_HashTable fontCache;	/* Map a string to an existing Tk_Font. Keys
				 * are string font names, values are TkFont
				 * pointers. */
    Tcl_HashTable namedTable;	/* Map a name to a set of attributes for a
				 * font, used when constructing a Tk_Font from
				 * a named font description. Keys are strings,
				 * values are NamedFont pointers. */
    TkMainInfo *mainPtr;	/* Application that owns this structure. */
    int updatePending;		/* Non-zero when a World Changed event has
				 * already been queued to handle a change to a
				 * named font. */
} TkFontInfo;

/*
 * The following data structure is used to keep track of the font attributes
 * for each named font that has been defined. The named font is only deleted
 * when the last reference to it goes away.
 */

typedef struct NamedFont {
    int refCount;		/* Number of users of named font. */
    int deletePending;		/* Non-zero if font should be deleted when
				 * last reference goes away. */
    TkFontAttributes fa;	/* Desired attributes for named font. */
} NamedFont;

/*
 * The following two structures are used to keep track of string measurement
 * information when using the text layout facilities.
 *
 * A LayoutChunk represents a contiguous range of text that can be measured
 * and displayed by low-level text calls. In general, chunks will be delimited
 * by newlines and tabs. Low-level, platform-specific things like kerning and
 * non-integer character widths may occur between the characters in a single
 * chunk, but not between characters in different chunks.
 *
 * A TextLayout is a collection of LayoutChunks. It can be displayed with
 * respect to any origin. It is the implementation of the Tk_TextLayout opaque
 * token.
 */

typedef struct LayoutChunk {
    const char *start;		/* Pointer to simple string to be displayed.
				 * This is a pointer into the TkTextLayout's
				 * string. */
    int numBytes;		/* The number of bytes in this chunk. */
    int numChars;		/* The number of characters in this chunk. */
    int numDisplayChars;	/* The number of characters to display when
				 * this chunk is displayed. Can be less than
				 * numChars if extra space characters were
				 * absorbed by the end of the chunk. This will
				 * be < 0 if this is a chunk that is holding a
				 * tab or newline. */
    int x, y;			/* The origin of the first character in this
				 * chunk with respect to the upper-left hand
				 * corner of the TextLayout. */
    int totalWidth;		/* Width in pixels of this chunk. Used when
				 * hit testing the invisible spaces at the end
				 * of a chunk. */
    int displayWidth;		/* Width in pixels of the displayable
				 * characters in this chunk. Can be less than
				 * width if extra space characters were
				 * absorbed by the end of the chunk. */
} LayoutChunk;

typedef struct TextLayout {
    Tk_Font tkfont;		/* The font used when laying out the text. */
    const char *string;		/* The string that was layed out. */
    int width;			/* The maximum width of all lines in the text
				 * layout. */
    int numChunks;		/* Number of chunks actually used in following
				 * array. */
    LayoutChunk chunks[1];	/* Array of chunks. The actual size will be
				 * maxChunks. THIS FIELD MUST BE THE LAST IN
				 * THE STRUCTURE. */
} TextLayout;

/*
 * The following structures are used as two-way maps between the values for
 * the fields in the TkFontAttributes structure and the strings used in Tcl,
 * when parsing both option-value format and style-list format font name
 * strings.
 */

static const TkStateMap weightMap[] = {
    {TK_FW_NORMAL,	"normal"},
    {TK_FW_BOLD,	"bold"},
    {TK_FW_UNKNOWN,	NULL}
};

static const TkStateMap slantMap[] = {
    {TK_FS_ROMAN,	"roman"},
    {TK_FS_ITALIC,	"italic"},
    {TK_FS_UNKNOWN,	NULL}
};

static const TkStateMap underlineMap[] = {
    {1,			"underline"},
    {0,			NULL}
};

static const TkStateMap overstrikeMap[] = {
    {1,			"overstrike"},
    {0,			NULL}
};

/*
 * The following structures are used when parsing XLFD's into a set of
 * TkFontAttributes.
 */

static const TkStateMap xlfdWeightMap[] = {
    {TK_FW_NORMAL,	"normal"},
    {TK_FW_NORMAL,	"medium"},
    {TK_FW_NORMAL,	"book"},
    {TK_FW_NORMAL,	"light"},
    {TK_FW_BOLD,	"bold"},
    {TK_FW_BOLD,	"demi"},
    {TK_FW_BOLD,	"demibold"},
    {TK_FW_NORMAL,	NULL}		/* Assume anything else is "normal". */
};

static const TkStateMap xlfdSlantMap[] = {
    {TK_FS_ROMAN,	"r"},
    {TK_FS_ITALIC,	"i"},
    {TK_FS_OBLIQUE,	"o"},
    {TK_FS_ROMAN,	NULL}		/* Assume anything else is "roman". */
};

static const TkStateMap xlfdSetwidthMap[] = {
    {TK_SW_NORMAL,	"normal"},
    {TK_SW_CONDENSE,	"narrow"},
    {TK_SW_CONDENSE,	"semicondensed"},
    {TK_SW_CONDENSE,	"condensed"},
    {TK_SW_UNKNOWN,	NULL}
};

/*
 * The following structure and defines specify the valid builtin options when
 * configuring a set of font attributes.
 */

static const char *const fontOpt[] = {
    "-family",
    "-size",
    "-weight",
    "-slant",
    "-underline",
    "-overstrike",
    NULL
};

#define FONT_FAMILY	0
#define FONT_SIZE	1
#define FONT_WEIGHT	2
#define FONT_SLANT	3
#define FONT_UNDERLINE	4
#define FONT_OVERSTRIKE	5
#define FONT_NUMFIELDS	6

/*
 * Hardcoded font aliases. These are used to describe (mostly) identical fonts
 * whose names differ from platform to platform. If the user-supplied font
 * name matches any of the names in one of the alias lists, the other names in
 * the alias list are also automatically tried.
 */

static const char *const timesAliases[] = {
    "Times",			/* Unix. */
    "Times New Roman",		/* Windows. */
    "New York",			/* Mac. */
    NULL
};

static const char *const helveticaAliases[] = {
    "Helvetica",		/* Unix. */
    "Arial",			/* Windows. */
    "Geneva",			/* Mac. */
    NULL
};

static const char *const courierAliases[] = {
    "Courier",			/* Unix and Mac. */
    "Courier New",		/* Windows. */
    NULL
};

static const char *const minchoAliases[] = {
    "mincho",			/* Unix. */
    "\357\274\255\357\274\263 \346\230\216\346\234\235",
				/* Windows (MS mincho). */
    "\346\234\254\346\230\216\346\234\235\342\210\222\357\274\255",
				/* Mac (honmincho-M). */
    NULL
};

static const char *const gothicAliases[] = {
    "gothic",			/* Unix. */
    "\357\274\255\357\274\263 \343\202\264\343\202\267\343\203\203\343\202\257",
				/* Windows (MS goshikku). */
    "\344\270\270\343\202\264\343\202\267\343\203\203\343\202\257\342\210\222\357\274\255",
				/* Mac (goshikku-M). */
    NULL
};

static const char *const dingbatsAliases[] = {
    "dingbats", "zapfdingbats", "itc zapfdingbats",
				/* Unix. */
				/* Windows. */
    "zapf dingbats",		/* Mac. */
    NULL
};

static const char *const *const fontAliases[] = {
    timesAliases,
    helveticaAliases,
    courierAliases,
    minchoAliases,
    gothicAliases,
    dingbatsAliases,
    NULL
};

/*
 * Hardcoded font classes. If the character cannot be found in the base font,
 * the classes are examined in order to see if some other similar font should
 * be examined also.
 */

static const char *const systemClass[] = {
    "fixed",			/* Unix. */
				/* Windows. */
    "chicago", "osaka", "sistemny",
				/* Mac. */
    NULL
};

static const char *const serifClass[] = {
    "times", "palatino", "mincho",
				/* All platforms. */
    "song ti",			/* Unix. */
    "ms serif", "simplified arabic",
				/* Windows. */
    "latinski",			/* Mac. */
    NULL
};

static const char *const sansClass[] = {
    "helvetica", "gothic",	/* All platforms. */
				/* Unix. */
    "ms sans serif", "traditional arabic",
				/* Windows. */
    "bastion",			/* Mac. */
    NULL
};

static const char *const monoClass[] = {
    "courier", "gothic",	/* All platforms. */
    "fangsong ti",		/* Unix. */
    "simplified arabic fixed",	/* Windows. */
    "monaco", "pryamoy",	/* Mac. */
    NULL
};

static const char *const symbolClass[] = {
    "symbol", "dingbats", "wingdings", NULL
};

static const char *const *const fontFallbacks[] = {
    systemClass,
    serifClass,
    sansClass,
    monoClass,
    symbolClass,
    NULL
};

/*
 * Global fallbacks. If the character could not be found in the preferred
 * fallback list, this list is examined. If the character still cannot be
 * found, all font families in the system are examined.
 */

static const char *const globalFontClass[] = {
    "symbol",			/* All platforms. */
				/* Unix. */
    "lucida sans unicode",	/* Windows. */
    "bitstream cyberbit",	/* Windows popular CJK font */
    "chicago",			/* Mac. */
    NULL
};

#define GetFontAttributes(tkfont) \
	((const TkFontAttributes *) &((TkFont *) (tkfont))->fa)

#define GetFontMetrics(tkfont)    \
	((const TkFontMetrics *) &((TkFont *) (tkfont))->fm)


static int		ConfigAttributesObj(Tcl_Interp *interp,
			    Tk_Window tkwin, int objc, Tcl_Obj *const objv[],
			    TkFontAttributes *faPtr);
static void		DupFontObjProc(Tcl_Obj *srcObjPtr, Tcl_Obj *dupObjPtr);
static int		FieldSpecified(const char *field);
static void		FreeFontObj(Tcl_Obj *objPtr);
static void		FreeFontObjProc(Tcl_Obj *objPtr);
static int		GetAttributeInfoObj(Tcl_Interp *interp,
			    const TkFontAttributes *faPtr, Tcl_Obj *objPtr);
static LayoutChunk *	NewChunk(TextLayout **layoutPtrPtr, int *maxPtr,
			    const char *start, int numChars, int curX,
			    int newX, int y);
static int		ParseFontNameObj(Tcl_Interp *interp, Tk_Window tkwin,
			    Tcl_Obj *objPtr, TkFontAttributes *faPtr);
static void		RecomputeWidgets(TkWindow *winPtr);
static int		SetFontFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static void		TheWorldHasChanged(ClientData clientData);
static void		UpdateDependentFonts(TkFontInfo *fiPtr,
			    Tk_Window tkwin, Tcl_HashEntry *namedHashPtr);

/*
 * The following structure defines the implementation of the "font" Tcl
 * object, used for drawing. The internalRep.twoPtrValue.ptr1 field of each
 * font object points to the TkFont structure for the font, or NULL.
 */

const Tcl_ObjType tkFontObjType = {
    "font",			/* name */
    FreeFontObjProc,		/* freeIntRepProc */
    DupFontObjProc,		/* dupIntRepProc */
    NULL,			/* updateStringProc */
    SetFontFromAny		/* setFromAnyProc */
};

/*
 *---------------------------------------------------------------------------
 *
 * TkFontPkgInit --
 *
 *	This function is called when an application is created. It initializes
 *	all the structures that are used by the font package on a per
 *	application basis.
 *
 * Results:
 *	Stores a token in the mainPtr to hold information needed by this
 *	package on a per application basis.
 *
 * Side effects:
 *	Memory allocated.
 *
 *---------------------------------------------------------------------------
 */

void
TkFontPkgInit(
    TkMainInfo *mainPtr)	/* The application being created. */
{
    TkFontInfo *fiPtr = ckalloc(sizeof(TkFontInfo));

    Tcl_InitHashTable(&fiPtr->fontCache, TCL_STRING_KEYS);
    Tcl_InitHashTable(&fiPtr->namedTable, TCL_STRING_KEYS);
    fiPtr->mainPtr = mainPtr;
    fiPtr->updatePending = 0;
    mainPtr->fontInfoPtr = fiPtr;

    TkpFontPkgInit(mainPtr);
}

/*
 *---------------------------------------------------------------------------
 *
 * TkFontPkgFree --
 *
 *	This function is called when an application is deleted. It deletes all
 *	the structures that were used by the font package for this
 *	application.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Memory freed.
 *
 *---------------------------------------------------------------------------
 */

void
TkFontPkgFree(
    TkMainInfo *mainPtr)	/* The application being deleted. */
{
    TkFontInfo *fiPtr = mainPtr->fontInfoPtr;
    Tcl_HashEntry *hPtr, *searchPtr;
    Tcl_HashSearch search;
    int fontsLeft = 0;

    for (searchPtr = Tcl_FirstHashEntry(&fiPtr->fontCache, &search);
	    searchPtr != NULL;
	    searchPtr = Tcl_NextHashEntry(&search)) {
	fontsLeft++;
#ifdef DEBUG_FONTS
	fprintf(stderr, "Font %s still in cache.\n",
		(char *) Tcl_GetHashKey(&fiPtr->fontCache, searchPtr));
#endif
    }

#ifdef PURIFY
    if (fontsLeft) {
	Tcl_Panic("TkFontPkgFree: all fonts should have been freed already");
    }
#endif

    Tcl_DeleteHashTable(&fiPtr->fontCache);

    hPtr = Tcl_FirstHashEntry(&fiPtr->namedTable, &search);
    while (hPtr != NULL) {
	ckfree(Tcl_GetHashValue(hPtr));
	hPtr = Tcl_NextHashEntry(&search);
    }
    Tcl_DeleteHashTable(&fiPtr->namedTable);
    if (fiPtr->updatePending) {
	Tcl_CancelIdleCall(TheWorldHasChanged, fiPtr);
    }
    ckfree(fiPtr);
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_FontObjCmd --
 *
 *	This function is implemented to process the "font" Tcl command. See
 *	the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tk_FontObjCmd(
    ClientData clientData,	/* Main window associated with interpreter. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    int index;
    Tk_Window tkwin = clientData;
    TkFontInfo *fiPtr = ((TkWindow *) tkwin)->mainPtr->fontInfoPtr;
    static const char *const optionStrings[] = {
	"actual",	"configure",	"create",	"delete",
	"families",	"measure",	"metrics",	"names",
	NULL
    };
    enum options {
	FONT_ACTUAL,	FONT_CONFIGURE,	FONT_CREATE,	FONT_DELETE,
	FONT_FAMILIES,	FONT_MEASURE,	FONT_METRICS,	FONT_NAMES
    };

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg?");
	return TCL_ERROR;
    }
    if (Tcl_GetIndexFromObj(interp, objv[1], optionStrings, "option", 0,
	    &index) != TCL_OK) {
	return TCL_ERROR;
    }

    switch ((enum options) index) {
    case FONT_ACTUAL: {
	int skip, result, n;
	const char *s;
	Tk_Font tkfont;
	Tcl_Obj *optPtr, *charPtr, *resultPtr;
#if TCL_UTF_MAX == 4
	int uniChar = 0;
#else
	Tcl_UniChar uniChar = 0;
#endif
	const TkFontAttributes *faPtr;
	TkFontAttributes fa;

	/*
	 * Params 0 and 1 are 'font actual'. Param 2 is the font name. 3-4 may
	 * be '-displayof $window'
	 */

	skip = TkGetDisplayOf(interp, objc - 3, objv + 3, &tkwin);
	if (skip < 0) {
	    return TCL_ERROR;
	}

	/*
	 * Next parameter may be an option.
	 */

	n = skip + 3;
	optPtr = NULL;
	charPtr = NULL;
	if (n < objc) {
	    s = Tcl_GetString(objv[n]);
	    if (s[0] == '-' && s[1] != '-') {
		optPtr = objv[n];
		n++;
	    } else {
		optPtr = NULL;
	    }
	}

	/*
	 * Next parameter may be '--' to mark end of options.
	 */

	if (n < objc) {
	    if (!strcmp(Tcl_GetString(objv[n]), "--")) {
		n++;
	    }
	}

	/*
	 * Next parameter is the character to get font information for.
	 */

	if (n < objc) {
	    charPtr = objv[n];
	    n++;
	}

	/*
	 * If there were fewer than 3 args, or args remain, that's an error.
	 */

	if (objc < 3 || n < objc) {
	    Tcl_WrongNumArgs(interp, 2, objv,
		    "font ?-displayof window? ?option? ?--? ?char?");
	    return TCL_ERROR;
	}

	/*
	 * The 'charPtr' arg must be a single Unicode.
	 */

	if (charPtr != NULL) {
#if TCL_UTF_MAX == 4
	    Tcl_UniChar *ucPtr;
#endif

	    if (Tcl_GetCharLength(charPtr) != 1) {
		resultPtr = Tcl_NewStringObj(
			"expected a single character but got \"", -1);
		Tcl_AppendLimitedToObj(resultPtr, Tcl_GetString(charPtr),
			-1, 40, "...");
		Tcl_AppendToObj(resultPtr, "\"", -1);
		Tcl_SetObjResult(interp, resultPtr);
		Tcl_SetErrorCode(interp, "TK", "VALUE", "FONT_SAMPLE", NULL);
		return TCL_ERROR;
	    }
#if TCL_UTF_MAX == 4
	    ucPtr = Tcl_GetUnicodeFromObj(charPtr, NULL);
	    uniChar = *ucPtr;
	    if (((uniChar & 0xFC00) == 0xD800) && (ucPtr[1] != 0x000)) {
		if ((ucPtr[1] & 0xFC00) == 0xDC00) {
		    uniChar = ((uniChar & 0x3FF) << 10) + (ucPtr[1] & 0x3FF);
		    uniChar += 0x10000;
		}
	    }
#else
	    uniChar = Tcl_GetUniChar(charPtr, 0);
#endif
	}

	/*
	 * Find the font.
	 */

	tkfont = Tk_AllocFontFromObj(interp, tkwin, objv[2]);
	if (tkfont == NULL) {
	    return TCL_ERROR;
	}

	/*
	 * Determine the font attributes.
	 */

	if (charPtr == NULL) {
	    faPtr = GetFontAttributes(tkfont);
	} else {
	    TkpGetFontAttrsForChar(tkwin, tkfont, uniChar, &fa);
	    faPtr = &fa;
	}
	result = GetAttributeInfoObj(interp, faPtr, optPtr);

	Tk_FreeFont(tkfont);
	return result;
    }
    case FONT_CONFIGURE: {
    	int result;
    	const char *string;
    	Tcl_Obj *objPtr;
    	NamedFont *nfPtr;
    	Tcl_HashEntry *namedHashPtr;

    	if (objc < 3) {
    	    Tcl_WrongNumArgs(interp, 2, objv, "fontname ?-option value ...?");
    	    return TCL_ERROR;
    	}
    	string = Tcl_GetString(objv[2]);
    	namedHashPtr = Tcl_FindHashEntry(&fiPtr->namedTable, string);
	nfPtr = NULL;		/* lint. */
    	if (namedHashPtr != NULL) {
    	    nfPtr = Tcl_GetHashValue(namedHashPtr);
    	}
    	if ((namedHashPtr == NULL) || nfPtr->deletePending) {
    	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
    		    "named font \"%s\" doesn't exist", string));
    	    Tcl_SetErrorCode(interp, "TK", "LOOKUP", "FONT", string, NULL);
    	    return TCL_ERROR;
    	}
    	if (objc == 3) {
    	    objPtr = NULL;
    	} else if (objc == 4) {
    	    objPtr = objv[3];
    	} else {
    	    result = ConfigAttributesObj(interp, tkwin, objc - 3, objv + 3,
    		    &nfPtr->fa);
    	    UpdateDependentFonts(fiPtr, tkwin, namedHashPtr);
    	    return result;
    	}
    	return GetAttributeInfoObj(interp, &nfPtr->fa, objPtr);
     }
    case FONT_CREATE: {
	int skip = 3, i;
	const char *name;
	char buf[16 + TCL_INTEGER_SPACE];
	TkFontAttributes fa;
	Tcl_HashEntry *namedHashPtr;

	if (objc < 3) {
	    name = NULL;
	} else {
	    name = Tcl_GetString(objv[2]);
	    if (name[0] == '-') {
		name = NULL;
	    }
	}
	if (name == NULL) {
	    /*
	     * No font name specified. Generate one of the form "fontX".
	     */

	    for (i = 1; ; i++) {
		sprintf(buf, "font%d", i);
		namedHashPtr = Tcl_FindHashEntry(&fiPtr->namedTable, buf);
		if (namedHashPtr == NULL) {
		    break;
		}
	    }
	    name = buf;
	    skip = 2;
	}
	TkInitFontAttributes(&fa);
	if (ConfigAttributesObj(interp, tkwin, objc - skip, objv + skip,
		&fa) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (TkCreateNamedFont(interp, tkwin, name, &fa) != TCL_OK) {
	    return TCL_ERROR;
	}
	Tcl_SetObjResult(interp, Tcl_NewStringObj(name, -1));
	break;
    }
    case FONT_DELETE: {
	int i, result = TCL_OK;
	const char *string;

	/*
	 * Delete the named font. If there are still widgets using this font,
	 * then it isn't deleted right away.
	 */

	if (objc < 3) {
	    Tcl_WrongNumArgs(interp, 2, objv, "fontname ?fontname ...?");
	    return TCL_ERROR;
	}
	for (i = 2; (i < objc) && (result == TCL_OK); i++) {
	    string = Tcl_GetString(objv[i]);
	    result = TkDeleteNamedFont(interp, tkwin, string);
	}
	return result;
    }
    case FONT_FAMILIES: {
	int skip = TkGetDisplayOf(interp, objc - 2, objv + 2, &tkwin);

	if (skip < 0) {
	    return TCL_ERROR;
	}
	if (objc - skip != 2) {
	    Tcl_WrongNumArgs(interp, 2, objv, "?-displayof window?");
	    return TCL_ERROR;
	}
	TkpGetFontFamilies(interp, tkwin);
	break;
    }
    case FONT_MEASURE: {
	const char *string;
	Tk_Font tkfont;
	int length = 0, skip = 0;

	if (objc > 4) {
	    skip = TkGetDisplayOf(interp, objc - 3, objv + 3, &tkwin);
	    if (skip < 0) {
		return TCL_ERROR;
	    }
	}
	if (objc - skip != 4) {
	    Tcl_WrongNumArgs(interp, 2, objv,
		    "font ?-displayof window? text");
	    return TCL_ERROR;
	}
	tkfont = Tk_AllocFontFromObj(interp, tkwin, objv[2]);
	if (tkfont == NULL) {
	    return TCL_ERROR;
	}
	string = Tcl_GetStringFromObj(objv[3 + skip], &length);
	Tcl_SetObjResult(interp, Tcl_NewIntObj(
		Tk_TextWidth(tkfont, string, length)));
	Tk_FreeFont(tkfont);
	break;
    }
    case FONT_METRICS: {
	Tk_Font tkfont;
	int skip, index, i;
	const TkFontMetrics *fmPtr;
	static const char *const switches[] = {
	    "-ascent", "-descent", "-linespace", "-fixed", NULL
	};

	skip = TkGetDisplayOf(interp, objc - 3, objv + 3, &tkwin);
	if (skip < 0) {
	    return TCL_ERROR;
	}
	if ((objc < 3) || ((objc - skip) > 4)) {
	    Tcl_WrongNumArgs(interp, 2, objv,
		    "font ?-displayof window? ?option?");
	    return TCL_ERROR;
	}
	tkfont = Tk_AllocFontFromObj(interp, tkwin, objv[2]);
	if (tkfont == NULL) {
	    return TCL_ERROR;
	}
	objc -= skip;
	objv += skip;
	fmPtr = GetFontMetrics(tkfont);
	if (objc == 3) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "-ascent %d -descent %d -linespace %d -fixed %d",
		    fmPtr->ascent, fmPtr->descent,
		    fmPtr->ascent + fmPtr->descent, fmPtr->fixed));
	} else {
	    if (Tcl_GetIndexFromObj(interp, objv[3], switches, "metric", 0,
		    &index) != TCL_OK) {
		Tk_FreeFont(tkfont);
		return TCL_ERROR;
	    }
	    i = 0;		/* Needed only to prevent compiler warning. */
	    switch (index) {
	    case 0: i = fmPtr->ascent;			break;
	    case 1: i = fmPtr->descent;			break;
	    case 2: i = fmPtr->ascent + fmPtr->descent;	break;
	    case 3: i = fmPtr->fixed;			break;
	    }
	    Tcl_SetObjResult(interp, Tcl_NewIntObj(i));
	}
	Tk_FreeFont(tkfont);
	break;
    }
    case FONT_NAMES: {
	Tcl_HashSearch search;
	Tcl_HashEntry *namedHashPtr;
	Tcl_Obj *resultPtr;

	if (objc != 2) {
	    Tcl_WrongNumArgs(interp, 1, objv, "names");
	    return TCL_ERROR;
	}
	resultPtr = Tcl_NewObj();
	namedHashPtr = Tcl_FirstHashEntry(&fiPtr->namedTable, &search);
	while (namedHashPtr != NULL) {
	    NamedFont *nfPtr = Tcl_GetHashValue(namedHashPtr);

	    if (!nfPtr->deletePending) {
		char *string = Tcl_GetHashKey(&fiPtr->namedTable,
			namedHashPtr);

		Tcl_ListObjAppendElement(NULL, resultPtr,
			Tcl_NewStringObj(string, -1));
	    }
	    namedHashPtr = Tcl_NextHashEntry(&search);
	}
	Tcl_SetObjResult(interp, resultPtr);
	break;
    }
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * UpdateDependentFonts, TheWorldHasChanged, RecomputeWidgets --
 *
 *	Called when the attributes of a named font changes. Updates all the
 *	instantiated fonts that depend on that named font and then uses the
 *	brute force approach and prepares every widget to recompute its
 *	geometry.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Things get queued for redisplay.
 *
 *---------------------------------------------------------------------------
 */

static void
UpdateDependentFonts(
    TkFontInfo *fiPtr,		/* Info about application's fonts. */
    Tk_Window tkwin,		/* A window in the application. */
    Tcl_HashEntry *namedHashPtr)/* The named font that is changing. */
{
    Tcl_HashEntry *cacheHashPtr;
    Tcl_HashSearch search;
    TkFont *fontPtr;
    NamedFont *nfPtr = Tcl_GetHashValue(namedHashPtr);

    if (nfPtr->refCount == 0) {
	/*
	 * Well nobody's using this named font, so don't have to tell any
	 * widgets to recompute themselves.
	 */

	return;
    }

    cacheHashPtr = Tcl_FirstHashEntry(&fiPtr->fontCache, &search);
    while (cacheHashPtr != NULL) {
	for (fontPtr = Tcl_GetHashValue(cacheHashPtr);
		fontPtr != NULL; fontPtr = fontPtr->nextPtr) {
	    if (fontPtr->namedHashPtr == namedHashPtr) {
		TkpGetFontFromAttributes(fontPtr, tkwin, &nfPtr->fa);
		if (!fiPtr->updatePending) {
		    fiPtr->updatePending = 1;
		    Tcl_DoWhenIdle(TheWorldHasChanged, fiPtr);
		}
	    }
	}
	cacheHashPtr = Tcl_NextHashEntry(&search);
    }
}

static void
TheWorldHasChanged(
    ClientData clientData)	/* Info about application's fonts. */
{
    TkFontInfo *fiPtr = clientData;

    fiPtr->updatePending = 0;
    RecomputeWidgets(fiPtr->mainPtr->winPtr);
}

static void
RecomputeWidgets(
    TkWindow *winPtr)		/* Window to which command is sent. */
{
    Tk_ClassWorldChangedProc *proc =
	    Tk_GetClassProc(winPtr->classProcsPtr, worldChangedProc);

    if (proc != NULL) {
	proc(winPtr->instanceData);
    }

    /*
     * Notify all the descendants of this window that the world has changed.
     *
     * This could be done recursively or iteratively. The recursive version is
     * easier to implement and understand, and typically, windows with a -font
     * option will be leaf nodes in the widget heirarchy (buttons, labels,
     * etc.), so the recursion depth will be shallow.
     *
     * However, the additional overhead of the recursive calls may become a
     * performance problem if typical usage alters such that -font'ed widgets
     * appear high in the heirarchy, causing deep recursion. This could happen
     * with text widgets, or more likely with the (not yet existant) labeled
     * frame widget. With these widgets it is possible, even likely, that a
     * -font'ed widget (text or labeled frame) will not be a leaf node, but
     * will instead have many descendants. If this is ever found to cause a
     * performance problem, it may be worth investigating an iterative version
     * of the code below.
     */

    for (winPtr=winPtr->childList ; winPtr!=NULL ; winPtr=winPtr->nextPtr) {
	RecomputeWidgets(winPtr);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * TkCreateNamedFont --
 *
 *	Create the specified named font with the given attributes in the named
 *	font table associated with the interp.
 *
 * Results:
 *	Returns TCL_OK if the font was successfully created, or TCL_ERROR if
 *	the named font already existed. If TCL_ERROR is returned, an error
 *	message is left in the interp's result.
 *
 * Side effects:
 *	Assume there used to exist a named font by the specified name, and
 *	that the named font had been deleted, but there were still some
 *	widgets using the named font at the time it was deleted. If a new
 *	named font is created with the same name, all those widgets that were
 *	using the old named font will be redisplayed using the new named
 *	font's attributes.
 *
 *---------------------------------------------------------------------------
 */

int
TkCreateNamedFont(
    Tcl_Interp *interp,		/* Interp for error return (can be NULL). */
    Tk_Window tkwin,		/* A window associated with interp. */
    const char *name,		/* Name for the new named font. */
    TkFontAttributes *faPtr)	/* Attributes for the new named font. */
{
    TkFontInfo *fiPtr = ((TkWindow *) tkwin)->mainPtr->fontInfoPtr;
    Tcl_HashEntry *namedHashPtr;
    int isNew;
    NamedFont *nfPtr;

    namedHashPtr = Tcl_CreateHashEntry(&fiPtr->namedTable, name, &isNew);
    if (!isNew) {
	nfPtr = Tcl_GetHashValue(namedHashPtr);
	if (!nfPtr->deletePending) {
	    if (interp) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"named font \"%s\" already exists", name));
		Tcl_SetErrorCode(interp, "TK", "FONT", "EXISTS", NULL);
	    }
	    return TCL_ERROR;
	}

	/*
	 * Recreating a named font with the same name as a previous named
	 * font. Some widgets were still using that named font, so they need
	 * to get redisplayed.
	 */

	nfPtr->fa = *faPtr;
	nfPtr->deletePending = 0;
	UpdateDependentFonts(fiPtr, tkwin, namedHashPtr);
	return TCL_OK;
    }

    nfPtr = ckalloc(sizeof(NamedFont));
    nfPtr->deletePending = 0;
    Tcl_SetHashValue(namedHashPtr, nfPtr);
    nfPtr->fa = *faPtr;
    nfPtr->refCount = 0;
    nfPtr->deletePending = 0;
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TkDeleteNamedFont --
 *
 *	Delete the named font. If there are still widgets using this font,
 *	then it isn't deleted right away.
 *
 *---------------------------------------------------------------------------
 */

int
TkDeleteNamedFont(
    Tcl_Interp *interp,		/* Interp for error return (can be NULL). */
    Tk_Window tkwin,		/* A window associated with interp. */
    const char *name)		/* Name for the new named font. */
{
    TkFontInfo *fiPtr = ((TkWindow *) tkwin)->mainPtr->fontInfoPtr;
    NamedFont *nfPtr;
    Tcl_HashEntry *namedHashPtr;

    namedHashPtr = Tcl_FindHashEntry(&fiPtr->namedTable, name);
    if (namedHashPtr == NULL) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "named font \"%s\" doesn't exist", name));
	    Tcl_SetErrorCode(interp, "TK", "LOOKUP", "FONT", name, NULL);
	}
	return TCL_ERROR;
    }
    nfPtr = Tcl_GetHashValue(namedHashPtr);
    if (nfPtr->refCount != 0) {
	nfPtr->deletePending = 1;
    } else {
	Tcl_DeleteHashEntry(namedHashPtr);
	ckfree(nfPtr);
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_GetFont --
 *
 *	Given a string description of a font, map the description to a
 *	corresponding Tk_Font that represents the font.
 *
 * Results:
 *	The return value is token for the font, or NULL if an error prevented
 *	the font from being created. If NULL is returned, an error message
 *	will be left in the interp's result.
 *
 * Side effects:
 *	The font is added to an internal database with a reference count. For
 *	each call to this function, there should eventually be a call to
 *	Tk_FreeFont() or Tk_FreeFontFromObj() so that the database is cleaned
 *	up when fonts aren't in use anymore.
 *
 *---------------------------------------------------------------------------
 */

Tk_Font
Tk_GetFont(
    Tcl_Interp *interp,		/* Interp for database and error return. */
    Tk_Window tkwin,		/* For display on which font will be used. */
    const char *string)		/* String describing font, as: named font,
				 * native format, or parseable string. */
{
    Tk_Font tkfont;
    Tcl_Obj *strPtr;

    strPtr = Tcl_NewStringObj(string, -1);
    Tcl_IncrRefCount(strPtr);
    tkfont = Tk_AllocFontFromObj(interp, tkwin, strPtr);
    Tcl_DecrRefCount(strPtr);
    return tkfont;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_AllocFontFromObj --
 *
 *	Given a string description of a font, map the description to a
 *	corresponding Tk_Font that represents the font.
 *
 * Results:
 *	The return value is token for the font, or NULL if an error prevented
 *	the font from being created. If NULL is returned, an error message
 *	will be left in interp's result object.
 *
 * Side effects:
 *	The font is added to an internal database with a reference count. For
 *	each call to this function, there should eventually be a call to
 *	Tk_FreeFont() or Tk_FreeFontFromObj() so that the database is cleaned
 *	up when fonts aren't in use anymore.
 *
 *---------------------------------------------------------------------------
 */

Tk_Font
Tk_AllocFontFromObj(
    Tcl_Interp *interp,		/* Interp for database and error return. */
    Tk_Window tkwin,		/* For screen on which font will be used. */
    Tcl_Obj *objPtr)		/* Object describing font, as: named font,
				 * native format, or parseable string. */
{
    TkFontInfo *fiPtr = ((TkWindow *) tkwin)->mainPtr->fontInfoPtr;
    Tcl_HashEntry *cacheHashPtr, *namedHashPtr;
    TkFont *fontPtr, *firstFontPtr, *oldFontPtr;
    int isNew, descent;
    NamedFont *nfPtr;

    if (objPtr->typePtr != &tkFontObjType
	    || objPtr->internalRep.twoPtrValue.ptr2 != fiPtr) {
	SetFontFromAny(interp, objPtr);
    }

    oldFontPtr = objPtr->internalRep.twoPtrValue.ptr1;
    if (oldFontPtr != NULL) {
	if (oldFontPtr->resourceRefCount == 0) {
	    /*
	     * This is a stale reference: it refers to a TkFont that's no
	     * longer in use. Clear the reference.
	     */

	    FreeFontObj(objPtr);
	    oldFontPtr = NULL;
	} else if (Tk_Screen(tkwin) == oldFontPtr->screen) {
	    oldFontPtr->resourceRefCount++;
	    return (Tk_Font) oldFontPtr;
	}
    }

    /*
     * Next, search the list of fonts that have the name we want, to see if
     * one of them is for the right screen.
     */

    isNew = 0;
    if (oldFontPtr != NULL) {
	cacheHashPtr = oldFontPtr->cacheHashPtr;
	FreeFontObj(objPtr);
    } else {
	cacheHashPtr = Tcl_CreateHashEntry(&fiPtr->fontCache,
		Tcl_GetString(objPtr), &isNew);
    }
    firstFontPtr = Tcl_GetHashValue(cacheHashPtr);
    for (fontPtr = firstFontPtr; (fontPtr != NULL);
	    fontPtr = fontPtr->nextPtr) {
	if (Tk_Screen(tkwin) == fontPtr->screen) {
	    fontPtr->resourceRefCount++;
	    fontPtr->objRefCount++;
	    objPtr->internalRep.twoPtrValue.ptr1 = fontPtr;
	    objPtr->internalRep.twoPtrValue.ptr2 = fiPtr;
	    return (Tk_Font) fontPtr;
	}
    }

    /*
     * The desired font isn't in the table. Make a new one.
     */

    namedHashPtr = Tcl_FindHashEntry(&fiPtr->namedTable,
	    Tcl_GetString(objPtr));
    if (namedHashPtr != NULL) {
	/*
	 * Construct a font based on a named font.
	 */

	nfPtr = Tcl_GetHashValue(namedHashPtr);
	nfPtr->refCount++;

	fontPtr = TkpGetFontFromAttributes(NULL, tkwin, &nfPtr->fa);
    } else {
	/*
	 * Native font?
	 */

	fontPtr = TkpGetNativeFont(tkwin, Tcl_GetString(objPtr));
	if (fontPtr == NULL) {
	    TkFontAttributes fa;
	    Tcl_Obj *dupObjPtr = Tcl_DuplicateObj(objPtr);

	    if (ParseFontNameObj(interp, tkwin, dupObjPtr, &fa) != TCL_OK) {
		if (isNew) {
		    Tcl_DeleteHashEntry(cacheHashPtr);
		}
		Tcl_DecrRefCount(dupObjPtr);
		return NULL;
	    }
	    Tcl_DecrRefCount(dupObjPtr);

	    /*
	     * String contained the attributes inline.
	     */

	    fontPtr = TkpGetFontFromAttributes(NULL, tkwin, &fa);
	}
    }

    /*
     * Detect the system font engine going wrong and fail more gracefully.
     */

    if (fontPtr == NULL) {
	if (isNew) {
	    Tcl_DeleteHashEntry(cacheHashPtr);
	}
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"failed to allocate font due to internal system font engine"
		" problem", -1));
	Tcl_SetErrorCode(interp, "TK", "FONT", "INTERNAL_PROBLEM", NULL);
	return NULL;
    }

    fontPtr->resourceRefCount = 1;
    fontPtr->objRefCount = 1;
    fontPtr->cacheHashPtr = cacheHashPtr;
    fontPtr->namedHashPtr = namedHashPtr;
    fontPtr->screen = Tk_Screen(tkwin);
    fontPtr->nextPtr = firstFontPtr;
    Tcl_SetHashValue(cacheHashPtr, fontPtr);

    Tk_MeasureChars((Tk_Font) fontPtr, "0", 1, -1, 0, &fontPtr->tabWidth);
    if (fontPtr->tabWidth == 0) {
	fontPtr->tabWidth = fontPtr->fm.maxWidth;
    }
    fontPtr->tabWidth *= 8;

    /*
     * Make sure the tab width isn't zero (some fonts may not have enough
     * information to set a reasonable tab width).
     */

    if (fontPtr->tabWidth == 0) {
	fontPtr->tabWidth = 1;
    }

    /*
     * Get information used for drawing underlines in generic code on a
     * non-underlined font.
     */

    descent = fontPtr->fm.descent;
    fontPtr->underlinePos = descent / 2;
    fontPtr->underlineHeight = TkFontGetPixels(tkwin, fontPtr->fa.size) / 10;
    if (fontPtr->underlineHeight == 0) {
	fontPtr->underlineHeight = 1;
    }
    if (fontPtr->underlinePos + fontPtr->underlineHeight > descent) {
	/*
	 * If this set of values would cause the bottom of the underline bar
	 * to stick below the descent of the font, jack the underline up a bit
	 * higher.
	 */

	fontPtr->underlineHeight = descent - fontPtr->underlinePos;
	if (fontPtr->underlineHeight == 0) {
	    fontPtr->underlinePos--;
	    fontPtr->underlineHeight = 1;
	}
    }

    objPtr->internalRep.twoPtrValue.ptr1 = fontPtr;
    objPtr->internalRep.twoPtrValue.ptr2 = fiPtr;
    return (Tk_Font) fontPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetFontFromObj --
 *
 *	Find the font that corresponds to a given object. The font must have
 *	already been created by Tk_GetFont or Tk_AllocFontFromObj.
 *
 * Results:
 *	The return value is a token for the font that matches objPtr and is
 *	suitable for use in tkwin.
 *
 * Side effects:
 *	If the object is not already a font ref, the conversion will free any
 *	old internal representation.
 *
 *----------------------------------------------------------------------
 */

Tk_Font
Tk_GetFontFromObj(
    Tk_Window tkwin,		/* The window that the font will be used
				 * in. */
    Tcl_Obj *objPtr)		/* The object from which to get the font. */
{
    TkFontInfo *fiPtr = ((TkWindow *) tkwin)->mainPtr->fontInfoPtr;
    TkFont *fontPtr;
    Tcl_HashEntry *hashPtr;

    if (objPtr->typePtr != &tkFontObjType
	    || objPtr->internalRep.twoPtrValue.ptr2 != fiPtr) {
	SetFontFromAny(NULL, objPtr);
    }

    fontPtr = objPtr->internalRep.twoPtrValue.ptr1;
    if (fontPtr != NULL) {
	if (fontPtr->resourceRefCount == 0) {
	    /*
	     * This is a stale reference: it refers to a TkFont that's no
	     * longer in use. Clear the reference.
	     */

	    FreeFontObj(objPtr);
	    fontPtr = NULL;
	} else if (Tk_Screen(tkwin) == fontPtr->screen) {
	    return (Tk_Font) fontPtr;
	}
    }

    /*
     * Next, search the list of fonts that have the name we want, to see if
     * one of them is for the right screen.
     */

    if (fontPtr != NULL) {
	hashPtr = fontPtr->cacheHashPtr;
	FreeFontObj(objPtr);
    } else {
	hashPtr = Tcl_FindHashEntry(&fiPtr->fontCache, Tcl_GetString(objPtr));
    }
    if (hashPtr != NULL) {
	for (fontPtr = Tcl_GetHashValue(hashPtr); fontPtr != NULL;
		fontPtr = fontPtr->nextPtr) {
	    if (Tk_Screen(tkwin) == fontPtr->screen) {
		fontPtr->objRefCount++;
		objPtr->internalRep.twoPtrValue.ptr1 = fontPtr;
		objPtr->internalRep.twoPtrValue.ptr2 = fiPtr;
		return (Tk_Font) fontPtr;
	    }
	}
    }

    Tcl_Panic("Tk_GetFontFromObj called with non-existent font!");
    return NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * SetFontFromAny --
 *
 *	Convert the internal representation of a Tcl object to the font
 *	internal form.
 *
 * Results:
 *	Always returns TCL_OK.
 *
 * Side effects:
 *	The object is left with its typePtr pointing to tkFontObjType. The
 *	TkFont pointer is NULL.
 *
 *----------------------------------------------------------------------
 */

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

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

    Tcl_GetString(objPtr);
    typePtr = objPtr->typePtr;
    if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
	typePtr->freeIntRepProc(objPtr);
    }
    objPtr->typePtr = &tkFontObjType;
    objPtr->internalRep.twoPtrValue.ptr1 = NULL;
    objPtr->internalRep.twoPtrValue.ptr2 = NULL;

    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_NameOfFont --
 *
 *	Given a font, return a textual string identifying it.
 *
 * Results:
 *	The return value is the description that was passed to Tk_GetFont() to
 *	create the font. The storage for the returned string is only
 *	guaranteed to persist until the font is deleted. The caller should not
 *	modify this string.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

const char *
Tk_NameOfFont(
    Tk_Font tkfont)		/* Font whose name is desired. */
{
    TkFont *fontPtr = (TkFont *) tkfont;

    return fontPtr->cacheHashPtr->key.string;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_FreeFont --
 *
 *	Called to release a font allocated by Tk_GetFont().
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The reference count associated with font is decremented, and only
 *	deallocated when no one is using it.
 *
 *---------------------------------------------------------------------------
 */

void
Tk_FreeFont(
    Tk_Font tkfont)		/* Font to be released. */
{
    TkFont *fontPtr = (TkFont *) tkfont, *prevPtr;
    NamedFont *nfPtr;

    if (fontPtr == NULL) {
	return;
    }
    fontPtr->resourceRefCount--;
    if (fontPtr->resourceRefCount > 0) {
	return;
    }
    if (fontPtr->namedHashPtr != NULL) {
	/*
	 * This font derived from a named font. Reduce the reference count on
	 * the named font and free it if no-one else is using it.
	 */

	nfPtr = Tcl_GetHashValue(fontPtr->namedHashPtr);
	nfPtr->refCount--;
	if ((nfPtr->refCount == 0) && nfPtr->deletePending) {
	    Tcl_DeleteHashEntry(fontPtr->namedHashPtr);
	    ckfree(nfPtr);
	}
    }

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

    TkpDeleteFont(fontPtr);
    if (fontPtr->objRefCount == 0) {
	ckfree(fontPtr);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_FreeFontFromObj --
 *
 *	Called to release a font inside a Tcl_Obj *. Decrements the refCount
 *	of the font and removes it from the hash tables if necessary.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The reference count associated with font is decremented, and only
 *	deallocated when no one is using it.
 *
 *---------------------------------------------------------------------------
 */

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

static void
FreeFontObjProc(
    Tcl_Obj *objPtr)		/* The object we are releasing. */
{
    FreeFontObj(objPtr);
    objPtr->typePtr = NULL;
}

static void
FreeFontObj(
    Tcl_Obj *objPtr)		/* The object we are releasing. */
{
    TkFont *fontPtr = objPtr->internalRep.twoPtrValue.ptr1;

    if (fontPtr != NULL) {
	fontPtr->objRefCount--;
	if ((fontPtr->resourceRefCount == 0) && (fontPtr->objRefCount == 0)) {
	    ckfree(fontPtr);
	}
	objPtr->internalRep.twoPtrValue.ptr1 = NULL;
	objPtr->internalRep.twoPtrValue.ptr2 = NULL;
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * DupFontObjProc --
 *
 *	When a cached font object is duplicated, this is called to update the
 *	internal reps.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The font's objRefCount is incremented and the internal rep of the copy
 *	is set to point to it.
 *
 *---------------------------------------------------------------------------
 */

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

    dupObjPtr->typePtr = srcObjPtr->typePtr;
    dupObjPtr->internalRep.twoPtrValue.ptr1 = fontPtr;
    dupObjPtr->internalRep.twoPtrValue.ptr2
	    = srcObjPtr->internalRep.twoPtrValue.ptr2;

    if (fontPtr != NULL) {
	fontPtr->objRefCount++;
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_FontId --
 *
 *	Given a font, return an opaque handle that should be selected into the
 *	XGCValues structure in order to get the constructed gc to use this
 *	font. This function would go away if the XGCValues structure were
 *	replaced with a TkGCValues structure.
 *
 * Results:
 *	As above.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

Font
Tk_FontId(
    Tk_Font tkfont)		/* Font that is going to be selected into
				 * GC. */
{
    TkFont *fontPtr = (TkFont *) tkfont;

    return fontPtr->fid;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_GetFontMetrics --
 *
 *	Returns overall ascent and descent metrics for the given font. These
 *	values can be used to space multiple lines of text and to align the
 *	baselines of text in different fonts.
 *
 * Results:
 *	If *heightPtr is non-NULL, it is filled with the overall height of the
 *	font, which is the sum of the ascent and descent. If *ascentPtr or
 *	*descentPtr is non-NULL, they are filled with the ascent and/or
 *	descent information for the font.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

void
Tk_GetFontMetrics(
    Tk_Font tkfont,		/* Font in which metrics are calculated. */
    Tk_FontMetrics *fmPtr)	/* Pointer to structure in which font metrics
				 * for tkfont will be stored. */
{
    TkFont *fontPtr = (TkFont *) tkfont;

    fmPtr->ascent = fontPtr->fm.ascent;
    fmPtr->descent = fontPtr->fm.descent;
    fmPtr->linespace = fontPtr->fm.ascent + fontPtr->fm.descent;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_PostscriptFontName --
 *
 *	Given a Tk_Font, return the name of the corresponding Postscript font.
 *
 * Results:
 *	The return value is the pointsize of the given Tk_Font. The name of
 *	the Postscript font is appended to dsPtr.
 *
 * Side effects:
 *	If the font does not exist on the printer, the print job will fail at
 *	print time. Given a "reasonable" Postscript printer, the following
 *	Tk_Font font families should print correctly:
 *
 *	    Avant Garde, Arial, Bookman, Courier, Courier New, Geneva,
 *	    Helvetica, Monaco, New Century Schoolbook, New York,
 *	    Palatino, Symbol, Times, Times New Roman, Zapf Chancery,
 *	    and Zapf Dingbats.
 *
 *	Any other Tk_Font font families may not print correctly because the
 *	computed Postscript font name may be incorrect.
 *
 *---------------------------------------------------------------------------
 */

int
Tk_PostscriptFontName(
    Tk_Font tkfont,		/* Font in which text will be printed. */
    Tcl_DString *dsPtr)		/* Pointer to an initialized Tcl_DString to
				 * which the name of the Postscript font that
				 * corresponds to tkfont will be appended. */
{
    TkFont *fontPtr = (TkFont *) tkfont;
    Tk_Uid family, weightString, slantString;
    char *src, *dest;
    int upper, len;

    len = Tcl_DStringLength(dsPtr);

    /*
     * Convert the case-insensitive Tk_Font family name to the case-sensitive
     * Postscript family name. Take out any spaces and capitalize the first
     * letter of each word.
     */

    family = fontPtr->fa.family;
    if (strncasecmp(family, "itc ", 4) == 0) {
	family = family + 4;
    }
    if ((strcasecmp(family, "Arial") == 0)
	    || (strcasecmp(family, "Geneva") == 0)) {
	family = "Helvetica";
    } else if ((strcasecmp(family, "Times New Roman") == 0)
	    || (strcasecmp(family, "New York") == 0)) {
	family = "Times";
    } else if ((strcasecmp(family, "Courier New") == 0)
	    || (strcasecmp(family, "Monaco") == 0)) {
	family = "Courier";
    } else if (strcasecmp(family, "AvantGarde") == 0) {
	family = "AvantGarde";
    } else if (strcasecmp(family, "ZapfChancery") == 0) {
	family = "ZapfChancery";
    } else if (strcasecmp(family, "ZapfDingbats") == 0) {
	family = "ZapfDingbats";
    } else {
#if TCL_UTF_MAX == 4
	int ch;
#else
	Tcl_UniChar ch;
#endif

	/*
	 * Inline, capitalize the first letter of each word, lowercase the
	 * rest of the letters in each word, and then take out the spaces
	 * between the words. This may make the DString shorter, which is safe
	 * to do.
	 */

	Tcl_DStringAppend(dsPtr, family, -1);

	src = dest = Tcl_DStringValue(dsPtr) + len;
	upper = 1;
	for (; *src != '\0'; ) {
	    while (isspace(UCHAR(*src))) { /* INTL: ISO space */
		src++;
		upper = 1;
	    }
#if TCL_UTF_MAX == 4
	    src += TkUtfToUniChar32(src, &ch);
#else
	    src += Tcl_UtfToUniChar(src, &ch);
#endif
	    if (upper) {
		ch = (Tcl_UniChar) Tcl_UniCharToUpper(ch);
		upper = 0;
	    } else {
		ch = (Tcl_UniChar) Tcl_UniCharToLower(ch);
	    }
	    dest += Tcl_UniCharToUtf(ch, dest);
	}
	*dest = '\0';
	Tcl_DStringSetLength(dsPtr, dest - Tcl_DStringValue(dsPtr));
	family = Tcl_DStringValue(dsPtr) + len;
    }
    if (family != Tcl_DStringValue(dsPtr) + len) {
	Tcl_DStringAppend(dsPtr, family, -1);
	family = Tcl_DStringValue(dsPtr) + len;
    }

    if (strcasecmp(family, "NewCenturySchoolbook") == 0) {
	Tcl_DStringSetLength(dsPtr, len);
	Tcl_DStringAppend(dsPtr, "NewCenturySchlbk", -1);
	family = Tcl_DStringValue(dsPtr) + len;
    }

    /*
     * Get the string to use for the weight.
     */

    weightString = NULL;
    if (fontPtr->fa.weight == TK_FW_NORMAL) {
	if (strcmp(family, "Bookman") == 0) {
	    weightString = "Light";
	} else if (strcmp(family, "AvantGarde") == 0) {
	    weightString = "Book";
	} else if (strcmp(family, "ZapfChancery") == 0) {
	    weightString = "Medium";
	}
    } else {
	if ((strcmp(family, "Bookman") == 0)
		|| (strcmp(family, "AvantGarde") == 0)) {
	    weightString = "Demi";
	} else {
	    weightString = "Bold";
	}
    }

    /*
     * Get the string to use for the slant.
     */

    slantString = NULL;
    if (fontPtr->fa.slant == TK_FS_ROMAN) {
	/* Do nothing */
    } else if ((strcmp(family, "Helvetica") == 0)
	    || (strcmp(family, "Courier") == 0)
	    || (strcmp(family, "AvantGarde") == 0)) {
	slantString = "Oblique";
    } else {
	slantString = "Italic";
    }

    /*
     * The string "Roman" needs to be added to some fonts that are not bold
     * and not italic.
     */

    if ((slantString == NULL) && (weightString == NULL)) {
	if ((strcmp(family, "Times") == 0)
		|| (strcmp(family, "NewCenturySchlbk") == 0)
		|| (strcmp(family, "Palatino") == 0)) {
	    Tcl_DStringAppend(dsPtr, "-Roman", -1);
	}
    } else {
	Tcl_DStringAppend(dsPtr, "-", -1);
	if (weightString != NULL) {
	    Tcl_DStringAppend(dsPtr, weightString, -1);
	}
	if (slantString != NULL) {
	    Tcl_DStringAppend(dsPtr, slantString, -1);
	}
    }

    return fontPtr->fa.size;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_TextWidth --
 *
 *	A wrapper function for the more complicated interface of
 *	Tk_MeasureChars. Computes how much space the given simple string
 *	needs.
 *
 * Results:
 *	The return value is the width (in pixels) of the given string.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
Tk_TextWidth(
    Tk_Font tkfont,		/* Font in which text will be measured. */
    const char *string,		/* String whose width will be computed. */
    int numBytes)		/* Number of bytes to consider from string, or
				 * < 0 for strlen(). */
{
    int width;

    if (numBytes < 0) {
	numBytes = strlen(string);
    }
    Tk_MeasureChars(tkfont, string, numBytes, -1, 0, &width);
    return width;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_UnderlineChars, TkUnderlineCharsInContext --
 *
 *	These procedures draw an underline for a given range of characters in
 *	a given string. They don't draw the characters (which are assumed to
 *	have been displayed previously); they just draw the underline. These
 *	procedures would mainly be used to quickly underline a few characters
 *	without having to construct an underlined font. To produce properly
 *	underlined text, the appropriate underlined font should be constructed
 *	and used.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Information gets displayed in "drawable".
 *
 *----------------------------------------------------------------------
 */

void
Tk_UnderlineChars(
    Display *display,		/* Display on which to draw. */
    Drawable drawable,		/* Window or pixmap in which to draw. */
    GC gc,			/* Graphics context for actually drawing
				 * line. */
    Tk_Font tkfont,		/* Font used in GC; must have been allocated
				 * by Tk_GetFont(). Used for character
				 * dimensions, etc. */
    const char *string,		/* String containing characters to be
				 * underlined or overstruck. */
    int x, int y,		/* Coordinates at which first character of
				 * string is drawn. */
    int firstByte,		/* Index of first byte of first character. */
    int lastByte)		/* Index of first byte after the last
				 * character. */
{
    TkUnderlineCharsInContext(display, drawable, gc, tkfont, string,
	    lastByte, x, y, firstByte, lastByte);
}

void
TkUnderlineCharsInContext(
    Display *display,		/* Display on which to draw. */
    Drawable drawable,		/* Window or pixmap in which to draw. */
    GC gc,			/* Graphics context for actually drawing
				 * line. */
    Tk_Font tkfont,		/* Font used in GC; must have been allocated
				 * by Tk_GetFont(). Used for character
				 * dimensions, etc. */
    const char *string,		/* String containing characters to be
				 * underlined or overstruck. */
    int numBytes,		/* Number of bytes in string. */
    int x, int y,		/* Coordinates at which the first character of
				 * the whole string would be drawn. */
    int firstByte,		/* Index of first byte of first character. */
    int lastByte)		/* Index of first byte after the last
				 * character. */
{
    TkFont *fontPtr = (TkFont *) tkfont;
    int startX, endX;

    TkpMeasureCharsInContext(tkfont, string, numBytes, 0, firstByte, -1, 0,
	    &startX);
    TkpMeasureCharsInContext(tkfont, string, numBytes, 0, lastByte, -1, 0,
	    &endX);

    XFillRectangle(display, drawable, gc, x + startX,
	    y + fontPtr->underlinePos, (unsigned) (endX - startX),
	    (unsigned) fontPtr->underlineHeight);
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_ComputeTextLayout --
 *
 *	Computes the amount of screen space needed to display a multi-line,
 *	justified string of text. Records all the measurements that were done
 *	to determine to size and positioning of the individual lines of text;
 *	this information can be used by the Tk_DrawTextLayout() function to
 *	display the text quickly (without remeasuring it).
 *
 *	This function is useful for simple widgets that want to display
 *	single-font, multi-line text and want Tk to handle the details.
 *
 * Results:
 *	The return value is a Tk_TextLayout token that holds the measurement
 *	information for the given string. The token is only valid for the
 *	given string. If the string is freed, the token is no longer valid and
 *	must also be freed. To free the token, call Tk_FreeTextLayout().
 *
 *	The dimensions of the screen area needed to display the text are
 *	stored in *widthPtr and *heightPtr.
 *
 * Side effects:
 *	Memory is allocated to hold the measurement information.
 *
 *---------------------------------------------------------------------------
 */

Tk_TextLayout
Tk_ComputeTextLayout(
    Tk_Font tkfont,		/* Font that will be used to display text. */
    const char *string,		/* String whose dimensions are to be
				 * computed. */
    int numChars,		/* Number of characters to consider from
				 * string, or < 0 for strlen(). */
    int wrapLength,		/* Longest permissible line length, in pixels.
				 * <= 0 means no automatic wrapping: just let
				 * lines get as long as needed. */
    Tk_Justify justify,		/* How to justify lines. */
    int flags,			/* Flag bits OR-ed together. TK_IGNORE_TABS
				 * means that tab characters should not be
				 * expanded. TK_IGNORE_NEWLINES means that
				 * newline characters should not cause a line
				 * break. */
    int *widthPtr,		/* Filled with width of string. */
    int *heightPtr)		/* Filled with height of string. */
{
    TkFont *fontPtr = (TkFont *) tkfont;
    const char *start, *end, *special;
    int n, y, bytesThisChunk, maxChunks, curLine, layoutHeight;
    int baseline, height, curX, newX, maxWidth, *lineLengths;
    TextLayout *layoutPtr;
    LayoutChunk *chunkPtr;
    const TkFontMetrics *fmPtr;
    Tcl_DString lineBuffer;

    Tcl_DStringInit(&lineBuffer);

    if ((fontPtr == NULL) || (string == NULL)) {
	if (widthPtr != NULL) {
	    *widthPtr = 0;
	}
	if (heightPtr != NULL) {
	    *heightPtr = 0;
	}
	return NULL;
    }

    fmPtr = &fontPtr->fm;

    height = fmPtr->ascent + fmPtr->descent;

    if (numChars < 0) {
	numChars = Tcl_NumUtfChars(string, -1);
    }
    if (wrapLength == 0) {
	wrapLength = -1;
    }

    maxChunks = 1;

    layoutPtr = ckalloc(sizeof(TextLayout)
	    + (maxChunks-1) * sizeof(LayoutChunk));
    layoutPtr->tkfont = tkfont;
    layoutPtr->string = string;
    layoutPtr->numChunks = 0;

    baseline = fmPtr->ascent;
    maxWidth = 0;

    /*
     * Divide the string up into simple strings and measure each string.
     */

    curX = 0;

    end = Tcl_UtfAtIndex(string, numChars);
    special = string;

    flags &= TK_IGNORE_TABS | TK_IGNORE_NEWLINES;
    flags |= TK_WHOLE_WORDS | TK_AT_LEAST_ONE;
    for (start = string; start < end; ) {
	if (start >= special) {
	    /*
	     * Find the next special character in the string.
	     *
	     * INTL: Note that it is safe to increment by byte, because we are
	     * looking for 7-bit characters that will appear unchanged in
	     * UTF-8. At some point we may need to support the full Unicode
	     * whitespace set.
	     */

	    for (special = start; special < end; special++) {
		if (!(flags & TK_IGNORE_NEWLINES)) {
		    if ((*special == '\n') || (*special == '\r')) {
			break;
		    }
		}
		if (!(flags & TK_IGNORE_TABS)) {
		    if (*special == '\t') {
			break;
		    }
		}
	    }
	}

	/*
	 * Special points at the next special character (or the end of the
	 * string). Process characters between start and special.
	 */

	chunkPtr = NULL;
	if (start < special) {
	    bytesThisChunk = Tk_MeasureChars(tkfont, start, special - start,
		    wrapLength - curX, flags, &newX);
	    newX += curX;
	    flags &= ~TK_AT_LEAST_ONE;
	    if (bytesThisChunk > 0) {
		chunkPtr = NewChunk(&layoutPtr, &maxChunks, start,
			bytesThisChunk, curX, newX, baseline);

		start += bytesThisChunk;
		curX = newX;
	    }
	}

	if ((start == special) && (special < end)) {
	    /*
	     * Handle the special character.
	     *
	     * INTL: Special will be pointing at a 7-bit character so we can
	     * safely treat it as a single byte.
	     */

	    chunkPtr = NULL;
	    if (*special == '\t') {
		newX = curX + fontPtr->tabWidth;
		newX -= newX % fontPtr->tabWidth;
		NewChunk(&layoutPtr, &maxChunks, start, 1, curX, newX,
			baseline)->numDisplayChars = -1;
		start++;
		curX = newX;
		flags &= ~TK_AT_LEAST_ONE;
		if ((start < end) &&
			((wrapLength <= 0) || (newX <= wrapLength))) {
		    /*
		     * More chars can still fit on this line.
		     */

		    continue;
		}
	    } else {
		NewChunk(&layoutPtr, &maxChunks, start, 1, curX, curX,
			baseline)->numDisplayChars = -1;
		start++;
		goto wrapLine;
	    }
	}

	/*
	 * No more characters are going to go on this line, either because no
	 * more characters can fit or there are no more characters left.
	 * Consume all extra spaces at end of line.
	 */

	while ((start < end) && isspace(UCHAR(*start))) { /* INTL: ISO space */
	    if (!(flags & TK_IGNORE_NEWLINES)) {
		if ((*start == '\n') || (*start == '\r')) {
		    break;
		}
	    }
	    if (!(flags & TK_IGNORE_TABS)) {
		if (*start == '\t') {
		    break;
		}
	    }
	    start++;
	}
	if (chunkPtr != NULL) {
	    const char *end;

	    /*
	     * Append all the extra spaces on this line to the end of the last
	     * text chunk. This is a little tricky because we are switching
	     * back and forth between characters and bytes.
	     */

	    end = chunkPtr->start + chunkPtr->numBytes;
	    bytesThisChunk = start - end;
	    if (bytesThisChunk > 0) {
		bytesThisChunk = Tk_MeasureChars(tkfont, end, bytesThisChunk,
			-1, 0, &chunkPtr->totalWidth);
		chunkPtr->numBytes += bytesThisChunk;
		chunkPtr->numChars += Tcl_NumUtfChars(end, bytesThisChunk);
		chunkPtr->totalWidth += curX;
	    }
	}

    wrapLine:
	flags |= TK_AT_LEAST_ONE;

	/*
	 * Save current line length, then move current position to start of
	 * next line.
	 */

	if (curX > maxWidth) {
	    maxWidth = curX;
	}

	/*
	 * Remember width of this line, so that all chunks on this line can be
	 * centered or right justified, if necessary.
	 */

	Tcl_DStringAppend(&lineBuffer, (char *) &curX, sizeof(curX));

	curX = 0;
	baseline += height;
    }

    /*
     * If last line ends with a newline, then we need to make a 0 width chunk
     * on the next line. Otherwise "Hello" and "Hello\n" are the same height.
     */

    if ((layoutPtr->numChunks > 0) && !(flags & TK_IGNORE_NEWLINES)) {
	if (layoutPtr->chunks[layoutPtr->numChunks - 1].start[0] == '\n') {
	    chunkPtr = NewChunk(&layoutPtr, &maxChunks, start, 0, curX,
		    curX, baseline);
	    chunkPtr->numDisplayChars = -1;
	    Tcl_DStringAppend(&lineBuffer, (char *) &curX, sizeof(curX));
	    baseline += height;
	}
    }

    layoutPtr->width = maxWidth;
    layoutHeight = baseline - fmPtr->ascent;
    if (layoutPtr->numChunks == 0) {
	layoutHeight = height;

	/*
	 * This fake chunk is used by the other functions so that they can
	 * pretend that there is a chunk with no chars in it, which makes the
	 * coding simpler.
	 */

	layoutPtr->numChunks = 1;
	layoutPtr->chunks[0].start		= string;
	layoutPtr->chunks[0].numBytes		= 0;
	layoutPtr->chunks[0].numChars		= 0;
	layoutPtr->chunks[0].numDisplayChars	= -1;
	layoutPtr->chunks[0].x			= 0;
	layoutPtr->chunks[0].y			= fmPtr->ascent;
	layoutPtr->chunks[0].totalWidth		= 0;
	layoutPtr->chunks[0].displayWidth	= 0;
    } else {
	/*
	 * Using maximum line length, shift all the chunks so that the lines
	 * are all justified correctly.
	 */

	curLine = 0;
	chunkPtr = layoutPtr->chunks;
	y = chunkPtr->y;
	lineLengths = (int *) Tcl_DStringValue(&lineBuffer);
	for (n = 0; n < layoutPtr->numChunks; n++) {
	    int extra;

	    if (chunkPtr->y != y) {
		curLine++;
		y = chunkPtr->y;
	    }
	    extra = maxWidth - lineLengths[curLine];
	    if (justify == TK_JUSTIFY_CENTER) {
		chunkPtr->x += extra / 2;
	    } else if (justify == TK_JUSTIFY_RIGHT) {
		chunkPtr->x += extra;
	    }
	    chunkPtr++;
	}
    }

    if (widthPtr != NULL) {
	*widthPtr = layoutPtr->width;
    }
    if (heightPtr != NULL) {
	*heightPtr = layoutHeight;
    }
    Tcl_DStringFree(&lineBuffer);

    return (Tk_TextLayout) layoutPtr;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_FreeTextLayout --
 *
 *	This function is called to release the storage associated with a
 *	Tk_TextLayout when it is no longer needed.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Memory is freed.
 *
 *---------------------------------------------------------------------------
 */

void
Tk_FreeTextLayout(
    Tk_TextLayout textLayout)	/* The text layout to be released. */
{
    TextLayout *layoutPtr = (TextLayout *) textLayout;

    if (layoutPtr != NULL) {
	ckfree(layoutPtr);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_DrawTextLayout --
 *
 *	Use the information in the Tk_TextLayout token to display a
 *	multi-line, justified string of text.
 *
 *	This function is useful for simple widgets that need to display
 *	single-font, multi-line text and want Tk to handle the details.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Text drawn on the screen.
 *
 *---------------------------------------------------------------------------
 */

void
Tk_DrawTextLayout(
    Display *display,		/* Display on which to draw. */
    Drawable drawable,		/* Window or pixmap in which to draw. */
    GC gc,			/* Graphics context to use for drawing
				 * text. */
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    int x, int y,		/* Upper-left hand corner of rectangle in
				 * which to draw (pixels). */
    int firstChar,		/* The index of the first character to draw
				 * from the given text item. 0 specfies the
				 * beginning. */
    int lastChar)		/* The index just after the last character to
				 * draw from the given text item. A number < 0
				 * means to draw all characters. */
{
    TextLayout *layoutPtr = (TextLayout *) layout;
    int i, numDisplayChars, drawX;
    const char *firstByte, *lastByte;
    LayoutChunk *chunkPtr;

    if (layoutPtr == NULL) {
	return;
    }

    if (lastChar < 0) {
	lastChar = 100000000;
    }
    chunkPtr = layoutPtr->chunks;
    for (i = 0; i < layoutPtr->numChunks; i++) {
	numDisplayChars = chunkPtr->numDisplayChars;
	if ((numDisplayChars > 0) && (firstChar < numDisplayChars)) {
	    if (firstChar <= 0) {
		drawX = 0;
		firstChar = 0;
		firstByte = chunkPtr->start;
	    } else {
		firstByte = Tcl_UtfAtIndex(chunkPtr->start, firstChar);
		Tk_MeasureChars(layoutPtr->tkfont, chunkPtr->start,
			firstByte - chunkPtr->start, -1, 0, &drawX);
	    }
	    if (lastChar < numDisplayChars) {
		numDisplayChars = lastChar;
	    }
	    lastByte = Tcl_UtfAtIndex(chunkPtr->start, numDisplayChars);
	    Tk_DrawChars(display, drawable, gc, layoutPtr->tkfont, firstByte,
		    lastByte - firstByte, x+chunkPtr->x+drawX, y+chunkPtr->y);
	}
	firstChar -= chunkPtr->numChars;
	lastChar -= chunkPtr->numChars;
	if (lastChar <= 0) {
	    break;
	}
	chunkPtr++;
    }
}

void
TkDrawAngledTextLayout(
    Display *display,		/* Display on which to draw. */
    Drawable drawable,		/* Window or pixmap in which to draw. */
    GC gc,			/* Graphics context to use for drawing
				 * text. */
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    int x, int y,		/* Upper-left hand corner of rectangle in
				 * which to draw (pixels). */
    double angle,
    int firstChar,		/* The index of the first character to draw
				 * from the given text item. 0 specfies the
				 * beginning. */
    int lastChar)		/* The index just after the last character to
				 * draw from the given text item. A number < 0
				 * means to draw all characters. */
{
    TextLayout *layoutPtr = (TextLayout *) layout;
    int i, numDisplayChars, drawX;
    const char *firstByte, *lastByte;
    LayoutChunk *chunkPtr;
    double sinA = sin(angle * PI/180.0), cosA = cos(angle * PI/180.0);

    if (layoutPtr == NULL) {
	return;
    }

    if (lastChar < 0) {
	lastChar = 100000000;
    }
    chunkPtr = layoutPtr->chunks;
    for (i = 0; i < layoutPtr->numChunks; i++) {
	numDisplayChars = chunkPtr->numDisplayChars;
	if ((numDisplayChars > 0) && (firstChar < numDisplayChars)) {
	    double dx, dy;

	    if (firstChar <= 0) {
		drawX = 0;
		firstChar = 0;
		firstByte = chunkPtr->start;
	    } else {
		firstByte = Tcl_UtfAtIndex(chunkPtr->start, firstChar);
		Tk_MeasureChars(layoutPtr->tkfont, chunkPtr->start,
			firstByte - chunkPtr->start, -1, 0, &drawX);
	    }
	    if (lastChar < numDisplayChars) {
		numDisplayChars = lastChar;
	    }
	    lastByte = Tcl_UtfAtIndex(chunkPtr->start, numDisplayChars);
	    dx = cosA * (chunkPtr->x + drawX) + sinA * (chunkPtr->y);
	    dy = -sinA * (chunkPtr->x + drawX) + cosA * (chunkPtr->y);
	    if (angle == 0.0) {
		Tk_DrawChars(display, drawable, gc, layoutPtr->tkfont,
			firstByte, lastByte - firstByte,
			(int)(x + dx), (int)(y + dy));
	    } else {
		TkDrawAngledChars(display, drawable, gc, layoutPtr->tkfont,
			firstByte, lastByte - firstByte, x+dx, y+dy, angle);
	    }
	}
	firstChar -= chunkPtr->numChars;
	lastChar -= chunkPtr->numChars;
	if (lastChar <= 0) {
	    break;
	}
	chunkPtr++;
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_UnderlineTextLayout --
 *
 *	Use the information in the Tk_TextLayout token to display an underline
 *	below an individual character. This function does not draw the text,
 *	just the underline.
 *
 *	This function is useful for simple widgets that need to display
 *	single-font, multi-line text with an individual character underlined
 *	and want Tk to handle the details. To display larger amounts of
 *	underlined text, construct and use an underlined font.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Underline drawn on the screen.
 *
 *---------------------------------------------------------------------------
 */

void
Tk_UnderlineTextLayout(
    Display *display,		/* Display on which to draw. */
    Drawable drawable,		/* Window or pixmap in which to draw. */
    GC gc,			/* Graphics context to use for drawing text. */
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    int x, int y,		/* Upper-left hand corner of rectangle in
				 * which to draw (pixels). */
    int underline)		/* Index of the single character to underline,
				 * or -1 for no underline. */
{
    int xx, yy, width, height;

    if ((Tk_CharBbox(layout, underline, &xx, &yy, &width, &height) != 0)
	    && (width != 0)) {
	TextLayout *layoutPtr = (TextLayout *) layout;
	TkFont *fontPtr = (TkFont *) layoutPtr->tkfont;

	XFillRectangle(display, drawable, gc, x + xx,
		y + yy + fontPtr->fm.ascent + fontPtr->underlinePos,
		(unsigned) width, (unsigned) fontPtr->underlineHeight);
    }
}

void
TkUnderlineAngledTextLayout(
    Display *display,		/* Display on which to draw. */
    Drawable drawable,		/* Window or pixmap in which to draw. */
    GC gc,			/* Graphics context to use for drawing
				 * text. */
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    int x, int y,		/* Upper-left hand corner of rectangle in
				 * which to draw (pixels). */
    double angle,
    int underline)		/* Index of the single character to underline,
				 * or -1 for no underline. */
{
    int xx, yy, width, height;

    if (angle == 0.0) {
	Tk_UnderlineTextLayout(display, drawable, gc, layout, x,y, underline);
	return;
    }

    if ((Tk_CharBbox(layout, underline, &xx, &yy, &width, &height) != 0)
	    && (width != 0)) {
	TextLayout *layoutPtr = (TextLayout *) layout;
	TkFont *fontPtr = (TkFont *) layoutPtr->tkfont;
	double sinA = sin(angle*PI/180), cosA = cos(angle*PI/180);
	double dy = yy + fontPtr->fm.ascent + fontPtr->underlinePos;
	XPoint points[5];

	/*
	 * Note that we're careful to only round a double value once, which
	 * minimizes roundoff errors.
	 */

	points[0].x = x + ROUND16(xx*cosA + dy*sinA);
	points[0].y = y + ROUND16(dy*cosA - xx*sinA);
	points[1].x = x + ROUND16(xx*cosA + dy*sinA + width*cosA);
	points[1].y = y + ROUND16(dy*cosA - xx*sinA - width*sinA);
	if (fontPtr->underlineHeight == 1) {
	    /*
	     * Thin underlines look better when rotated when drawn as a line
	     * rather than a rectangle; the rasterizer copes better.
	     */

	    XDrawLines(display, drawable, gc, points, 2, CoordModeOrigin);
	} else {
	    points[2].x = x + ROUND16(xx*cosA + dy*sinA + width*cosA
		    + fontPtr->underlineHeight*sinA);
	    points[2].y = y + ROUND16(dy*cosA - xx*sinA - width*sinA
		    + fontPtr->underlineHeight*cosA);
	    points[3].x = x + ROUND16(xx*cosA + dy*sinA
		    + fontPtr->underlineHeight*sinA);
	    points[3].y = y + ROUND16(dy*cosA - xx*sinA
		    + fontPtr->underlineHeight*cosA);
	    points[4].x = points[0].x;
	    points[4].y = points[0].y;
	    XFillPolygon(display, drawable, gc, points, 5, Complex,
		    CoordModeOrigin);
	    XDrawLines(display, drawable, gc, points, 5, CoordModeOrigin);
	}
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_PointToChar --
 *
 *	Use the information in the Tk_TextLayout token to determine the
 *	character closest to the given point. The point must be specified with
 *	respect to the upper-left hand corner of the text layout, which is
 *	considered to be located at (0, 0).
 *
 *	Any point whose y-value is less that 0 will be considered closest to
 *	the first character in the text layout; any point whose y-value is
 *	greater than the height of the text layout will be considered closest
 *	to the last character in the text layout.
 *
 *	Any point whose x-value is less than 0 will be considered closest to
 *	the first character on that line; any point whose x-value is greater
 *	than the width of the text layout will be considered closest to the
 *	last character on that line.
 *
 * Results:
 *	The return value is the index of the character that was closest to the
 *	point. Given a text layout with no characters, the value 0 will always
 *	be returned, referring to a hypothetical zero-width placeholder
 *	character.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
Tk_PointToChar(
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    int x, int y)		/* Coordinates of point to check, with respect
				 * to the upper-left corner of the text
				 * layout. */
{
    TextLayout *layoutPtr = (TextLayout *) layout;
    LayoutChunk *chunkPtr, *lastPtr;
    TkFont *fontPtr;
    int i, n, dummy, baseline, pos, numChars;

    if (y < 0) {
	/*
	 * Point lies above any line in this layout. Return the index of the
	 * first char.
	 */

	return 0;
    }

    /*
     * Find which line contains the point.
     */

    fontPtr = (TkFont *) layoutPtr->tkfont;
    lastPtr = chunkPtr = layoutPtr->chunks;
    numChars = 0;
    for (i = 0; i < layoutPtr->numChunks; i++) {
	baseline = chunkPtr->y;
	if (y < baseline + fontPtr->fm.descent) {
	    if (x < chunkPtr->x) {
		/*
		 * Point is to the left of all chunks on this line. Return the
		 * index of the first character on this line.
		 */

		return numChars;
	    }
	    if (x >= layoutPtr->width) {
		/*
		 * If point lies off right side of the text layout, return the
		 * last char in the last chunk on this line. Without this, it
		 * might return the index of the first char that was located
		 * outside of the text layout.
		 */

		x = INT_MAX;
	    }

	    /*
	     * Examine all chunks on this line to see which one contains the
	     * specified point.
	     */

	    lastPtr = chunkPtr;
	    while ((i < layoutPtr->numChunks) && (chunkPtr->y == baseline)) {
		if (x < chunkPtr->x + chunkPtr->totalWidth) {
		    /*
		     * Point falls on one of the characters in this chunk.
		     */

		    if (chunkPtr->numDisplayChars < 0) {
			/*
			 * This is a special chunk that encapsulates a single
			 * tab or newline char.
			 */

			return numChars;
		    }
		    n = Tk_MeasureChars((Tk_Font) fontPtr, chunkPtr->start,
			    chunkPtr->numBytes, x - chunkPtr->x, 0, &dummy);
		    return numChars + Tcl_NumUtfChars(chunkPtr->start, n);
		}
		numChars += chunkPtr->numChars;
		lastPtr = chunkPtr;
		chunkPtr++;
		i++;
	    }

	    /*
	     * Point is to the right of all chars in all the chunks on this
	     * line. Return the index just past the last char in the last
	     * chunk on this line.
	     */

	    pos = numChars;
	    if (i < layoutPtr->numChunks) {
		pos--;
	    }
	    return pos;
	}
	numChars += chunkPtr->numChars;
	lastPtr = chunkPtr;
	chunkPtr++;
    }

    /*
     * Point lies below any line in this text layout. Return the index just
     * past the last char.
     */

    return (lastPtr->start + lastPtr->numChars) - layoutPtr->string;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_CharBbox --
 *
 *	Use the information in the Tk_TextLayout token to return the bounding
 *	box for the character specified by index.
 *
 *	The width of the bounding box is the advance width of the character,
 *	and does not include and left- or right-bearing. Any character that
 *	extends partially outside of the text layout is considered to be
 *	truncated at the edge. Any character which is located completely
 *	outside of the text layout is considered to be zero-width and pegged
 *	against the edge.
 *
 *	The height of the bounding box is the line height for this font,
 *	extending from the top of the ascent to the bottom of the descent.
 *	Information about the actual height of the individual letter is not
 *	available.
 *
 *	A text layout that contains no characters is considered to contain a
 *	single zero-width placeholder character.
 *
 * Results:
 *	The return value is 0 if the index did not specify a character in the
 *	text layout, or non-zero otherwise. In that case, *bbox is filled with
 *	the bounding box of the character.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
Tk_CharBbox(
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    int index,			/* The index of the character whose bbox is
				 * desired. */
    int *xPtr, int *yPtr,	/* Filled with the upper-left hand corner, in
				 * pixels, of the bounding box for the
				 * character specified by index, if
				 * non-NULL. */
    int *widthPtr, int *heightPtr)
				/* Filled with the width and height of the
				 * bounding box for the character specified by
				 * index, if non-NULL. */
{
    TextLayout *layoutPtr = (TextLayout *) layout;
    LayoutChunk *chunkPtr;
    int i, x = 0, w;
    Tk_Font tkfont;
    TkFont *fontPtr;
    const char *end;

    if (index < 0) {
	return 0;
    }

    chunkPtr = layoutPtr->chunks;
    tkfont = layoutPtr->tkfont;
    fontPtr = (TkFont *) tkfont;

    for (i = 0; i < layoutPtr->numChunks; i++) {
	if (chunkPtr->numDisplayChars < 0) {
	    if (index == 0) {
		x = chunkPtr->x;
		w = chunkPtr->totalWidth;
		goto check;
	    }
	} else if (index < chunkPtr->numChars) {
	    end = Tcl_UtfAtIndex(chunkPtr->start, index);
	    if (xPtr != NULL) {
		Tk_MeasureChars(tkfont, chunkPtr->start,
			end - chunkPtr->start, -1, 0, &x);
		x += chunkPtr->x;
	    }
	    if (widthPtr != NULL) {
		Tk_MeasureChars(tkfont, end, Tcl_UtfNext(end) - end,
			-1, 0, &w);
	    }
	    goto check;
	}
	index -= chunkPtr->numChars;
	chunkPtr++;
    }
    if (index != 0) {
	return 0;
    }

    /*
     * Special case to get location just past last char in layout.
     */

    chunkPtr--;
    x = chunkPtr->x + chunkPtr->totalWidth;
    w = 0;

    /*
     * Ensure that the bbox lies within the text layout. This forces all chars
     * that extend off the right edge of the text layout to have truncated
     * widths, and all chars that are completely off the right edge of the
     * text layout to peg to the edge and have 0 width.
     */

  check:
    if (yPtr != NULL) {
	*yPtr = chunkPtr->y - fontPtr->fm.ascent;
    }
    if (heightPtr != NULL) {
	*heightPtr = fontPtr->fm.ascent + fontPtr->fm.descent;
    }

    if (x > layoutPtr->width) {
	x = layoutPtr->width;
    }
    if (xPtr != NULL) {
	*xPtr = x;
    }
    if (widthPtr != NULL) {
	if (x + w > layoutPtr->width) {
	    w = layoutPtr->width - x;
	}
	*widthPtr = w;
    }

    return 1;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_DistanceToTextLayout --
 *
 *	Computes the distance in pixels from the given point to the given text
 *	layout. Non-displaying space characters that occur at the end of
 *	individual lines in the text layout are ignored for hit detection
 *	purposes.
 *
 * Results:
 *	The return value is 0 if the point (x, y) is inside the text layout.
 *	If the point isn't inside the text layout then the return value is the
 *	distance in pixels from the point to the text item.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
Tk_DistanceToTextLayout(
    Tk_TextLayout layout,	/* Layout information, from a previous call
				 * to Tk_ComputeTextLayout(). */
    int x, int y)		/* Coordinates of point to check, with respect
				 * to the upper-left corner of the text layout
				 * (in pixels). */
{
    int i, x1, x2, y1, y2, xDiff, yDiff, dist, minDist, ascent, descent;
    TextLayout *layoutPtr = (TextLayout *) layout;
    LayoutChunk *chunkPtr;
    TkFont *fontPtr;

    fontPtr = (TkFont *) layoutPtr->tkfont;
    ascent = fontPtr->fm.ascent;
    descent = fontPtr->fm.descent;

    minDist = 0;
    chunkPtr = layoutPtr->chunks;
    for (i = 0; i < layoutPtr->numChunks; i++) {
	if (chunkPtr->start[0] == '\n') {
	    /*
	     * Newline characters are not counted when computing distance (but
	     * tab characters would still be considered).
	     */

	    chunkPtr++;
	    continue;
	}

	x1 = chunkPtr->x;
	y1 = chunkPtr->y - ascent;
	x2 = chunkPtr->x + chunkPtr->displayWidth;
	y2 = chunkPtr->y + descent;

	if (x < x1) {
	    xDiff = x1 - x;
	} else if (x >= x2) {
	    xDiff = x - x2 + 1;
	} else {
	    xDiff = 0;
	}

	if (y < y1) {
	    yDiff = y1 - y;
	} else if (y >= y2) {
	    yDiff = y - y2 + 1;
	} else {
	    yDiff = 0;
	}
	if ((xDiff == 0) && (yDiff == 0)) {
	    return 0;
	}
	dist = (int) hypot((double) xDiff, (double) yDiff);
	if ((dist < minDist) || (minDist == 0)) {
	    minDist = dist;
	}
	chunkPtr++;
    }
    return minDist;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_IntersectTextLayout --
 *
 *	Determines whether a text layout lies entirely inside, entirely
 *	outside, or overlaps a given rectangle. Non-displaying space
 *	characters that occur at the end of individual lines in the text
 *	layout are ignored for intersection calculations.
 *
 * Results:
 *	The return value is -1 if the text layout is entirely outside of the
 *	rectangle, 0 if it overlaps, and 1 if it is entirely inside of the
 *	rectangle.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
Tk_IntersectTextLayout(
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    int x, int y,		/* Upper-left hand corner, in pixels, of
				 * rectangular area to compare with text
				 * layout. Coordinates are with respect to the
				 * upper-left hand corner of the text layout
				 * itself. */
    int width, int height)	/* The width and height of the above
				 * rectangular area, in pixels. */
{
    int result, i, x1, y1, x2, y2;
    TextLayout *layoutPtr = (TextLayout *) layout;
    LayoutChunk *chunkPtr;
    TkFont *fontPtr;
    int left, top, right, bottom;

    /*
     * Scan the chunks one at a time, seeing whether each is entirely in,
     * entirely out, or overlapping the rectangle. If an overlap is detected,
     * return immediately; otherwise wait until all chunks have been processed
     * and see if they were all inside or all outside.
     */

    chunkPtr = layoutPtr->chunks;
    fontPtr = (TkFont *) layoutPtr->tkfont;

    left = x;
    top = y;
    right = x + width;
    bottom = y + height;

    result = 0;
    for (i = 0; i < layoutPtr->numChunks; i++) {
	if ((chunkPtr->start[0] == '\n') || (chunkPtr->numBytes == 0)) {
	    /*
	     * Newline characters and empty chunks are not counted when
	     * computing area intersection (but tab characters would still be
	     * considered).
	     */

	    chunkPtr++;
	    continue;
	}

	x1 = chunkPtr->x;
	y1 = chunkPtr->y - fontPtr->fm.ascent;
	x2 = chunkPtr->x + chunkPtr->displayWidth;
	y2 = chunkPtr->y + fontPtr->fm.descent;

	if ((right < x1) || (left >= x2)
		|| (bottom < y1) || (top >= y2)) {
	    if (result == 1) {
		return 0;
	    }
	    result = -1;
	} else if ((x1 < left) || (x2 >= right)
		|| (y1 < top) || (y2 >= bottom)) {
	    return 0;
	} else if (result == -1) {
	    return 0;
	} else {
	    result = 1;
	}
	chunkPtr++;
    }
    return result;
}

/*
 *---------------------------------------------------------------------------
 *
 * TkIntersectAngledTextLayout --
 *
 *	Determines whether a text layout that has been turned by an angle
 *	about its top-left coordinae lies entirely inside, entirely outside,
 *	or overlaps a given rectangle. Non-displaying space characters that
 *	occur at the end of individual lines in the text layout are ignored
 *	for intersection calculations.
 *
 * Results:
 *	The return value is -1 if the text layout is entirely outside of the
 *	rectangle, 0 if it overlaps, and 1 if it is entirely inside of the
 *	rectangle.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

static inline int
PointInQuadrilateral(
    double qx[],
    double qy[],
    double x,
    double y)
{
    int i;

    for (i=0 ; i<4 ; i++) {
	double sideDX = qx[(i+1)%4] - qx[i];
	double sideDY = qy[(i+1)%4] - qy[i];
	double dx = x - qx[i];
	double dy = y - qy[i];

	if (sideDX*dy < sideDY*dx) {
	    return 0;
	}
    }
    return 1;
}

static inline int
SidesIntersect(
    double ax1, double ay1, double ax2, double ay2,
    double bx1, double by1, double bx2, double by2)
{
#if 0
/* http://www.freelunchdesign.com/cgi-bin/codwiki.pl?DiscussionTopics/CollideMeUpBaby */

    double a1, b1, c1, a2, b2, c2, r1, r2, r3, r4, denom;

    a1 = ay2 - ay1;
    b1 = ax1 - ax2;
    c1 = (ax2 * ay1) - (ax1 * ay2);
    r3 = (a1 * bx1) + (b1 * by1) + c1;
    r4 = (a1 * bx2) + (b1 * by2) + c1;
    if ((r3 != 0.0) && (r4 != 0.0) && (r3*r4 > 0.0)) {
	return 0;
    }

    a2 = by2 - by1;
    b2 = bx1 - bx2;
    c2 = (bx2 * by1) - (bx1 * by2);
    r1 = (a2 * ax1) + (b2 * ay1) + c2;
    r2 = (a2 * ax2) + (b2 * ay2) + c2;
    if ((r1 != 0.0) && (r2 != 0.0) && (r1*r2 > 0.0)) {
	return 0;
    }

    denom = (a1 * b2) - (a2 * b1);
    return (denom != 0.0);
#else
    /*
     * A more efficient version. Two line segments intersect if, when seen
     * from the perspective of one line, the two endpoints of the other
     * segment lie on opposite sides of the line, and vice versa. "Lie on
     * opposite sides" is computed by taking the cross products and seeing if
     * they are of opposite signs.
     */

    double dx, dy, dx1, dy1;

    dx = ax2 - ax1;
    dy = ay2 - ay1;
    dx1 = bx1 - ax1;
    dy1 = by1 - ay1;
    if ((dx*dy1-dy*dx1 > 0.0) == (dx*(by2-ay1)-dy*(bx2-ax1) > 0.0)) {
	return 0;
    }
    dx = bx2 - bx1;
    dy = by2 - by1;
    if ((dy*dx1-dx*dy1 > 0.0) == (dx*(ay2-by1)-dy*(ax2-bx1) > 0.0)) {
	return 0;
    }
    return 1;
#endif
}

int
TkIntersectAngledTextLayout(
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    int x, int y,		/* Upper-left hand corner, in pixels, of
				 * rectangular area to compare with text
				 * layout. Coordinates are with respect to the
				 * upper-left hand corner of the text layout
				 * itself. */
    int width, int height,	/* The width and height of the above
				 * rectangular area, in pixels. */
    double angle)
{
    int i, x1, y1, x2, y2;
    TextLayout *layoutPtr;
    LayoutChunk *chunkPtr;
    TkFont *fontPtr;
    double c = cos(angle * PI/180.0), s = sin(angle * PI/180.0);
    double rx[4], ry[4];

    if (angle == 0.0) {
	return Tk_IntersectTextLayout(layout, x, y, width, height);
    }

    /*
     * Compute the coordinates of the rectangle, rotated into text layout
     * space.
     */

    rx[0] = x*c - y*s;
    ry[0] = y*c + x*s;
    rx[1] = (x+width)*c - y*s;
    ry[1] = y*c + (x+width)*s;
    rx[2] = (x+width)*c - (y+height)*s;
    ry[2] = (y+height)*c + (x+width)*s;
    rx[3] = x*c - (y+height)*s;
    ry[3] = (y+height)*c + x*s;

    /*
     * Want to know if all chunks are inside the rectangle, or if there is any
     * overlap. First, we check to see if all chunks are inside; if and only
     * if they are, we're in the "inside" case.
     */

    layoutPtr = (TextLayout *) layout;
    chunkPtr = layoutPtr->chunks;
    fontPtr = (TkFont *) layoutPtr->tkfont;

    for (i=0 ; i<layoutPtr->numChunks ; i++,chunkPtr++) {
	if (chunkPtr->start[0] == '\n') {
	    /*
	     * Newline characters are not counted when computing area
	     * intersection (but tab characters would still be considered).
	     */

	    continue;
	}

	x1 = chunkPtr->x;
	y1 = chunkPtr->y - fontPtr->fm.ascent;
	x2 = chunkPtr->x + chunkPtr->displayWidth;
	y2 = chunkPtr->y + fontPtr->fm.descent;
	if (	!PointInQuadrilateral(rx, ry, x1, y1) ||
		!PointInQuadrilateral(rx, ry, x2, y1) ||
		!PointInQuadrilateral(rx, ry, x2, y2) ||
		!PointInQuadrilateral(rx, ry, x1, y2)) {
	    goto notInside;
	}
    }
    return 1;

    /*
     * Next, check to see if all the points of the rectangle are inside a
     * single chunk; if they are, we're in an "overlap" case.
     */

  notInside:
    chunkPtr = layoutPtr->chunks;

    for (i=0 ; i<layoutPtr->numChunks ; i++,chunkPtr++) {
	double cx[4], cy[4];

	if (chunkPtr->start[0] == '\n') {
	    /*
	     * Newline characters are not counted when computing area
	     * intersection (but tab characters would still be considered).
	     */

	    continue;
	}

	cx[0] = cx[3] = chunkPtr->x;
	cy[0] = cy[1] = chunkPtr->y - fontPtr->fm.ascent;
	cx[1] = cx[2] = chunkPtr->x + chunkPtr->displayWidth;
	cy[2] = cy[3] = chunkPtr->y + fontPtr->fm.descent;
	if (	!PointInQuadrilateral(cx, cy, rx[0], ry[0]) ||
		!PointInQuadrilateral(cx, cy, rx[1], ry[1]) ||
		!PointInQuadrilateral(cx, cy, rx[2], ry[2]) ||
		!PointInQuadrilateral(cx, cy, rx[3], ry[3])) {
	    goto notReverseInside;
	}
    }
    return 0;

    /*
     * If we're overlapping now, we must be partially in and out of at least
     * one chunk. If that is the case, there must be one line segment of the
     * rectangle that is touching or crossing a line segment of a chunk.
     */

  notReverseInside:
    chunkPtr = layoutPtr->chunks;

    for (i=0 ; i<layoutPtr->numChunks ; i++,chunkPtr++) {
	int j;

	if (chunkPtr->start[0] == '\n') {
	    /*
	     * Newline characters are not counted when computing area
	     * intersection (but tab characters would still be considered).
	     */

	    continue;
	}

	x1 = chunkPtr->x;
	y1 = chunkPtr->y - fontPtr->fm.ascent;
	x2 = chunkPtr->x + chunkPtr->displayWidth;
	y2 = chunkPtr->y + fontPtr->fm.descent;

	for (j=0 ; j<4 ; j++) {
	    int k = (j+1) % 4;

	    if (    SidesIntersect(rx[j],ry[j], rx[k],ry[k], x1,y1, x2,y1) ||
		    SidesIntersect(rx[j],ry[j], rx[k],ry[k], x2,y1, x2,y2) ||
		    SidesIntersect(rx[j],ry[j], rx[k],ry[k], x2,y2, x1,y2) ||
		    SidesIntersect(rx[j],ry[j], rx[k],ry[k], x1,y2, x1,y1)) {
		return 0;
	    }
	}
    }

    /*
     * They must be wholly non-overlapping.
     */

    return -1;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tk_TextLayoutToPostscript --
 *
 *	Outputs the contents of a text layout in Postscript format. The set of
 *	lines in the text layout will be rendered by the user supplied
 *	Postscript function. The function should be of the form:
 *
 *	    justify x y string function --
 *
 *	Justify is -1, 0, or 1, depending on whether the following string
 *	should be left, center, or right justified, x and y is the location
 *	for the origin of the string, string is the sequence of characters to
 *	be printed, and function is the name of the caller-provided function;
 *	the function should leave nothing on the stack.
 *
 *	The meaning of the origin of the string (x and y) depends on the
 *	justification. For left justification, x is where the left edge of the
 *	string should appear. For center justification, x is where the center
 *	of the string should appear. And for right justification, x is where
 *	the right edge of the string should appear. This behavior is necessary
 *	because, for example, right justified text on the screen is justified
 *	with screen metrics. The same string needs to be justified with
 *	printer metrics on the printer to appear in the correct place with
 *	respect to other similarly justified strings. In all circumstances, y
 *	is the location of the baseline for the string.
 *
 * Results:
 *	The interp's result is modified to hold the Postscript code that will
 *	render the text layout.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

void
Tk_TextLayoutToPostscript(
    Tcl_Interp *interp,		/* Filled with Postscript code. */
    Tk_TextLayout layout)	/* The layout to be rendered. */
{
    TextLayout *layoutPtr = (TextLayout *) layout;
    LayoutChunk *chunkPtr = layoutPtr->chunks;
    int baseline = chunkPtr->y;
    Tcl_Obj *psObj = Tcl_NewObj();
    int i, j, len;
    const char *p, *glyphname;
    char uindex[5], c, *ps;
#if TCL_UTF_MAX == 4
    int ch;
#else
    Tcl_UniChar ch;
#endif

    Tcl_AppendToObj(psObj, "[(", -1);
    for (i = 0; i < layoutPtr->numChunks; i++, chunkPtr++) {
	if (baseline != chunkPtr->y) {
	    Tcl_AppendToObj(psObj, ")]\n[(", -1);
	    baseline = chunkPtr->y;
	}
	if (chunkPtr->numDisplayChars <= 0) {
	    if (chunkPtr->start[0] == '\t') {
		Tcl_AppendToObj(psObj, "\\t", -1);
	    }
	    continue;
	}

	for (p=chunkPtr->start, j=0; j<chunkPtr->numDisplayChars; j++) {
	    /*
	     * INTL: We only handle symbols that have an encoding as a glyph
	     * from the standard set defined by Adobe. The rest get punted.
	     * Eventually this should be revised to handle more sophsticiated
	     * international postscript fonts.
	     */

#if TCL_UTF_MAX == 4
	    p += TkUtfToUniChar32(p, &ch);
#else
	    p += Tcl_UtfToUniChar(p, &ch);
#endif
	    if ((ch == '(') || (ch == ')') || (ch == '\\') || (ch < 0x20)) {
		/*
		 * Tricky point: the "03" is necessary in the sprintf below,
		 * so that a full three digits of octal are always generated.
		 * Without the "03", a number following this sequence could be
		 * interpreted by Postscript as part of this sequence.
		 */

		Tcl_AppendPrintfToObj(psObj, "\\%03o", ch);
		continue;
	    } else if (ch <= 0x7f) {
		/*
		 * Normal ASCII character.
		 */

		c = (char) ch;
		Tcl_AppendToObj(psObj, &c, 1);
		continue;
	    }

	    /*
	     * This character doesn't belong to the ASCII character set, so we
	     * use the full glyph name.
	     */

#if TCL_UTF_MAX > 3
	    if (ch > 0xffff) {
		goto noMapping;
	    }
#endif
	    sprintf(uindex, "%04X", ch);		/* endianness? */
	    glyphname = Tcl_GetVar2(interp, "::tk::psglyphs", uindex, 0);
	    if (glyphname) {
		ps = Tcl_GetStringFromObj(psObj, &len);
		if (ps[len-1] == '(') {
		    /*
		     * In-place edit. Ewww!
		     */

		    ps[len-1] = '/';
		} else {
		    Tcl_AppendToObj(psObj, ")/", -1);
		}
		Tcl_AppendToObj(psObj, glyphname, -1);
		Tcl_AppendToObj(psObj, "(", -1);
	    } else {
		/*
		 * No known mapping for the character into the space of
		 * PostScript glyphs. Ignore it. :-(
		 */
noMapping:	;

#ifdef TK_DEBUG_POSTSCRIPT_OUTPUT
		fprintf(stderr, "Warning: no mapping to PostScript "
			"glyphs for \\u%04x\n", ch);
#endif
	    }
	}
    }
    Tcl_AppendToObj(psObj, ")]\n", -1);
    Tcl_AppendObjToObj(Tcl_GetObjResult(interp), psObj);
    Tcl_DecrRefCount(psObj);
}

/*
 *---------------------------------------------------------------------------
 *
 * ConfigAttributesObj --
 *
 *	Process command line options to fill in fields of a properly
 *	initialized font attributes structure.
 *
 * Results:
 *	A standard Tcl return value. If TCL_ERROR is returned, an error
 *	message will be left in interp's result object.
 *
 * Side effects:
 *	The fields of the font attributes structure get filled in with
 *	information from argc/argv. If an error occurs while parsing, the font
 *	attributes structure will contain all modifications specified in the
 *	command line options up to the point of the error.
 *
 *---------------------------------------------------------------------------
 */

static int
ConfigAttributesObj(
    Tcl_Interp *interp,		/* Interp for error return. */
    Tk_Window tkwin,		/* For display on which font will be used. */
    int objc,			/* Number of elements in argv. */
    Tcl_Obj *const objv[],	/* Command line options. */
    TkFontAttributes *faPtr)	/* Font attributes structure whose fields are
				 * to be modified. Structure must already be
				 * properly initialized. */
{
    int i, n, index;
    Tcl_Obj *optionPtr, *valuePtr;
    const char *value;

    for (i = 0; i < objc; i += 2) {
	optionPtr = objv[i];

	if (Tcl_GetIndexFromObj(interp, optionPtr, fontOpt, "option", 1,
		&index) != TCL_OK) {
	    return TCL_ERROR;
	}
	if ((i+2 >= objc) && (objc & 1)) {
	    /*
	     * This test occurs after Tcl_GetIndexFromObj() so that "font
	     * create xyz -xyz" will return the error message that "-xyz" is a
	     * bad option, rather than that the value for "-xyz" is missing.
	     */

	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"value for \"%s\" option missing",
			Tcl_GetString(optionPtr)));
		Tcl_SetErrorCode(interp, "TK", "FONT", "NO_ATTRIBUTE", NULL);
	    }
	    return TCL_ERROR;
	}
	valuePtr = objv[i + 1];

	switch (index) {
	case FONT_FAMILY:
	    value = Tcl_GetString(valuePtr);
	    faPtr->family = Tk_GetUid(value);
	    break;
	case FONT_SIZE:
	    if (Tcl_GetIntFromObj(interp, valuePtr, &n) != TCL_OK) {
		return TCL_ERROR;
	    }
	    faPtr->size = n;
	    break;
	case FONT_WEIGHT:
	    n = TkFindStateNumObj(interp, optionPtr, weightMap, valuePtr);
	    if (n == TK_FW_UNKNOWN) {
		return TCL_ERROR;
	    }
	    faPtr->weight = n;
	    break;
	case FONT_SLANT:
	    n = TkFindStateNumObj(interp, optionPtr, slantMap, valuePtr);
	    if (n == TK_FS_UNKNOWN) {
		return TCL_ERROR;
	    }
	    faPtr->slant = n;
	    break;
	case FONT_UNDERLINE:
	    if (Tcl_GetBooleanFromObj(interp, valuePtr, &n) != TCL_OK) {
		return TCL_ERROR;
	    }
	    faPtr->underline = n;
	    break;
	case FONT_OVERSTRIKE:
	    if (Tcl_GetBooleanFromObj(interp, valuePtr, &n) != TCL_OK) {
		return TCL_ERROR;
	    }
	    faPtr->overstrike = n;
	    break;
	}
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * GetAttributeInfoObj --
 *
 *	Return information about the font attributes as a Tcl list.
 *
 * Results:
 *	The return value is TCL_OK if the objPtr was non-NULL and specified a
 *	valid font attribute, TCL_ERROR otherwise. If TCL_OK is returned, the
 *	interp's result object is modified to hold a description of either the
 *	current value of a single option, or a list of all options and their
 *	current values for the given font attributes. If TCL_ERROR is
 *	returned, the interp's result is set to an error message describing
 *	that the objPtr did not refer to a valid option.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

static int
GetAttributeInfoObj(
    Tcl_Interp *interp,		/* Interp to hold result. */
    const TkFontAttributes *faPtr,
				/* The font attributes to inspect. */
    Tcl_Obj *objPtr)		/* If non-NULL, indicates the single option
				 * whose value is to be returned. Otherwise
				 * information is returned for all options. */
{
    int i, index, start, end;
    const char *str;
    Tcl_Obj *valuePtr, *resultPtr = NULL;

    start = 0;
    end = FONT_NUMFIELDS;
    if (objPtr != NULL) {
	if (Tcl_GetIndexFromObj(interp, objPtr, fontOpt, "option", TCL_EXACT,
		&index) != TCL_OK) {
	    return TCL_ERROR;
	}
	start = index;
	end = index + 1;
    }

    valuePtr = NULL;
    if (objPtr == NULL) {
	resultPtr = Tcl_NewObj();
    }
    for (i = start; i < end; i++) {
	switch (i) {
	case FONT_FAMILY:
	    str = faPtr->family;
	    valuePtr = Tcl_NewStringObj(str, ((str == NULL) ? 0 : -1));
	    break;

	case FONT_SIZE:
	    valuePtr = Tcl_NewIntObj(faPtr->size);
	    break;

	case FONT_WEIGHT:
	    str = TkFindStateString(weightMap, faPtr->weight);
	    valuePtr = Tcl_NewStringObj(str, -1);
	    break;

	case FONT_SLANT:
	    str = TkFindStateString(slantMap, faPtr->slant);
	    valuePtr = Tcl_NewStringObj(str, -1);
	    break;

	case FONT_UNDERLINE:
	    valuePtr = Tcl_NewBooleanObj(faPtr->underline);
	    break;

	case FONT_OVERSTRIKE:
	    valuePtr = Tcl_NewBooleanObj(faPtr->overstrike);
	    break;
	}
	if (objPtr != NULL) {
	    Tcl_SetObjResult(interp, valuePtr);
	    return TCL_OK;
	}
	Tcl_ListObjAppendElement(NULL, resultPtr,
		Tcl_NewStringObj(fontOpt[i], -1));
	Tcl_ListObjAppendElement(NULL, resultPtr, valuePtr);
    }
    Tcl_SetObjResult(interp, resultPtr);
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * ParseFontNameObj --
 *
 *	Converts a object into a set of font attributes that can be used to
 *	construct a font.
 *
 *	The string rep of the object can be one of the following forms:
 *		XLFD (see X documentation)
 *		"family [size] [style1 [style2 ...]"
 *		"-option value [-option value ...]"
 *
 * Results:
 *	The return value is TCL_ERROR if the object was syntactically invalid.
 *	In that case an error message is left in interp's result object.
 *	Otherwise, fills the font attribute buffer with the values parsed from
 *	the string and returns TCL_OK;
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

static int
ParseFontNameObj(
    Tcl_Interp *interp,		/* Interp for error return. */
    Tk_Window tkwin,		/* For display on which font is used. */
    Tcl_Obj *objPtr,		/* Parseable font description object. */
    TkFontAttributes *faPtr)	/* Filled with attributes parsed from font
				 * name. Any attributes that were not
				 * specified in font name are filled with
				 * default values. */
{
    char *dash;
    int objc, result, i, n;
    Tcl_Obj **objv;
    const char *string;

    TkInitFontAttributes(faPtr);

    string = Tcl_GetString(objPtr);
    if (*string == '-') {
	/*
	 * This may be an XLFD or an "-option value" string.
	 *
	 * If the string begins with "-*" or a "-foundry-family-*" pattern,
	 * then consider it an XLFD.
	 */

	if (string[1] == '*') {
	    goto xlfd;
	}
	dash = strchr(string + 1, '-');
	if ((dash != NULL)
		&& !isspace(UCHAR(dash[-1]))) {	/* INTL: ISO space */
	    goto xlfd;
	}

	if (Tcl_ListObjGetElements(interp, objPtr, &objc, &objv) != TCL_OK) {
	    return TCL_ERROR;
	}

	return ConfigAttributesObj(interp, tkwin, objc, objv, faPtr);
    }

    if (*string == '*') {
	/*
	 * This is appears to be an XLFD. Under Unix, all valid XLFDs were
	 * already handled by TkpGetNativeFont. If we are here, either we have
	 * something that initially looks like an XLFD but isn't or we have
	 * encountered an XLFD on Windows or Mac.
	 */

    xlfd:
	result = TkFontParseXLFD(string, faPtr, NULL);
	if (result == TCL_OK) {
	    return TCL_OK;
	}

	/*
	 * If the string failed to parse but was considered to be a XLFD
	 * then it may be a "-option value" string with a hyphenated family
	 * name as per bug 2791352
	 */

	if (Tcl_ListObjGetElements(interp, objPtr, &objc, &objv) != TCL_OK) {
	    return TCL_ERROR;
	}

	if (ConfigAttributesObj(interp, tkwin, objc, objv, faPtr) == TCL_OK) {
	    return TCL_OK;
	}
    }

    /*
     * Wasn't an XLFD or "-option value" string. Try it as a "font size style"
     * list.
     */

    if ((Tcl_ListObjGetElements(NULL, objPtr, &objc, &objv) != TCL_OK)
	    || (objc < 1)) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "font \"%s\" doesn't exist", string));
	    Tcl_SetErrorCode(interp, "TK", "LOOKUP", "FONT", string, NULL);
	}
	return TCL_ERROR;
    }

    faPtr->family = Tk_GetUid(Tcl_GetString(objv[0]));
    if (objc > 1) {
	if (Tcl_GetIntFromObj(interp, objv[1], &n) != TCL_OK) {
	    return TCL_ERROR;
	}
	faPtr->size = n;
    }

    i = 2;
    if (objc == 3) {
	if (Tcl_ListObjGetElements(interp, objv[2], &objc, &objv) != TCL_OK) {
	    return TCL_ERROR;
	}
	i = 0;
    }
    for ( ; i < objc; i++) {
	n = TkFindStateNumObj(NULL, NULL, weightMap, objv[i]);
	if (n != TK_FW_UNKNOWN) {
	    faPtr->weight = n;
	    continue;
	}
	n = TkFindStateNumObj(NULL, NULL, slantMap, objv[i]);
	if (n != TK_FS_UNKNOWN) {
	    faPtr->slant = n;
	    continue;
	}
	n = TkFindStateNumObj(NULL, NULL, underlineMap, objv[i]);
	if (n != 0) {
	    faPtr->underline = n;
	    continue;
	}
	n = TkFindStateNumObj(NULL, NULL, overstrikeMap, objv[i]);
	if (n != 0) {
	    faPtr->overstrike = n;
	    continue;
	}

	/*
	 * Unknown style.
	 */

	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "unknown font style \"%s\"", Tcl_GetString(objv[i])));
	    Tcl_SetErrorCode(interp, "TK", "LOOKUP", "FONT_STYLE",
		    Tcl_GetString(objv[i]), NULL);
	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * NewChunk --
 *
 *	Helper function for Tk_ComputeTextLayout(). Encapsulates a measured
 *	set of characters in a chunk that can be quickly drawn.
 *
 * Results:
 *	A pointer to the new chunk in the text layout.
 *
 * Side effects:
 *	The text layout is reallocated to hold more chunks as necessary.
 *
 *	Currently, Tk_ComputeTextLayout() stores contiguous ranges of "normal"
 *	characters in a chunk, along with individual tab and newline chars in
 *	their own chunks. All characters in the text layout are accounted for.
 *
 *---------------------------------------------------------------------------
 */

static LayoutChunk *
NewChunk(
    TextLayout **layoutPtrPtr,
    int *maxPtr,
    const char *start,
    int numBytes,
    int curX,
    int newX,
    int y)
{
    TextLayout *layoutPtr;
    LayoutChunk *chunkPtr;
    int maxChunks, numChars;
    size_t s;

    layoutPtr = *layoutPtrPtr;
    maxChunks = *maxPtr;
    if (layoutPtr->numChunks == maxChunks) {
	maxChunks *= 2;
	s = sizeof(TextLayout) + ((maxChunks - 1) * sizeof(LayoutChunk));
	layoutPtr = ckrealloc(layoutPtr, s);

	*layoutPtrPtr = layoutPtr;
	*maxPtr = maxChunks;
    }
    numChars = Tcl_NumUtfChars(start, numBytes);
    chunkPtr = &layoutPtr->chunks[layoutPtr->numChunks];
    chunkPtr->start		= start;
    chunkPtr->numBytes		= numBytes;
    chunkPtr->numChars		= numChars;
    chunkPtr->numDisplayChars	= numChars;
    chunkPtr->x			= curX;
    chunkPtr->y			= y;
    chunkPtr->totalWidth	= newX - curX;
    chunkPtr->displayWidth	= newX - curX;
    layoutPtr->numChunks++;

    return chunkPtr;
}

/*
 *---------------------------------------------------------------------------
 *
 * TkFontParseXLFD --
 *
 *	Break up a fully specified XLFD into a set of font attributes.
 *
 * Results:
 *	Return value is TCL_ERROR if string was not a fully specified XLFD.
 *	Otherwise, fills font attribute buffer with the values parsed from the
 *	XLFD and returns TCL_OK.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
TkFontParseXLFD(
    const char *string,		/* Parseable font description string. */
    TkFontAttributes *faPtr,	/* Filled with attributes parsed from font
				 * name. Any attributes that were not
				 * specified in font name are filled with
				 * default values. */
    TkXLFDAttributes *xaPtr)	/* Filled with X-specific attributes parsed
				 * from font name. Any attributes that were
				 * not specified in font name are filled with
				 * default values. May be NULL if such
				 * information is not desired. */
{
    char *src;
    const char *str;
    int i, j;
    char *field[XLFD_NUMFIELDS + 2];
    Tcl_DString ds;
    TkXLFDAttributes xa;

    if (xaPtr == NULL) {
	xaPtr = &xa;
    }
    TkInitFontAttributes(faPtr);
    TkInitXLFDAttributes(xaPtr);

    memset(field, '\0', sizeof(field));

    str = string;
    if (*str == '-') {
	str++;
    }

    Tcl_DStringInit(&ds);
    Tcl_DStringAppend(&ds, str, -1);
    src = Tcl_DStringValue(&ds);

    field[0] = src;
    for (i = 0; *src != '\0'; src++) {
	if (!(*src & 0x80)
		&& Tcl_UniCharIsUpper(UCHAR(*src))) {
	    *src = (char) Tcl_UniCharToLower(UCHAR(*src));
	}
	if (*src == '-') {
	    i++;
	    if (i == XLFD_NUMFIELDS) {
		continue;
	    }
	    *src = '\0';
	    field[i] = src + 1;
	    if (i > XLFD_NUMFIELDS) {
		break;
	    }
	}
    }

    /*
     * An XLFD of the form -adobe-times-medium-r-*-12-*-* is pretty common,
     * but it is (strictly) malformed, because the first * is eliding both the
     * Setwidth and the Addstyle fields. If the Addstyle field is a number,
     * then assume the above incorrect form was used and shift all the rest of
     * the fields right by one, so the number gets interpreted as a pixelsize.
     * This fix is so that we don't get a million reports that "it works under
     * X (as a native font name), but gives a syntax error under Windows (as a
     * parsed set of attributes)".
     */

    if ((i > XLFD_ADD_STYLE) && FieldSpecified(field[XLFD_ADD_STYLE])) {
	if (atoi(field[XLFD_ADD_STYLE]) != 0) {
	    for (j = XLFD_NUMFIELDS - 1; j >= XLFD_ADD_STYLE; j--) {
		field[j + 1] = field[j];
	    }
	    field[XLFD_ADD_STYLE] = NULL;
	    i++;
	}
    }

    /*
     * Bail if we don't have enough of the fields (up to pointsize).
     */

    if (i < XLFD_FAMILY) {
	Tcl_DStringFree(&ds);
	return TCL_ERROR;
    }

    if (FieldSpecified(field[XLFD_FOUNDRY])) {
	xaPtr->foundry = Tk_GetUid(field[XLFD_FOUNDRY]);
    }

    if (FieldSpecified(field[XLFD_FAMILY])) {
	faPtr->family = Tk_GetUid(field[XLFD_FAMILY]);
    }
    if (FieldSpecified(field[XLFD_WEIGHT])) {
	faPtr->weight = TkFindStateNum(NULL, NULL, xlfdWeightMap,
		field[XLFD_WEIGHT]);
    }
    if (FieldSpecified(field[XLFD_SLANT])) {
	xaPtr->slant = TkFindStateNum(NULL, NULL, xlfdSlantMap,
		field[XLFD_SLANT]);
	if (xaPtr->slant == TK_FS_ROMAN) {
	    faPtr->slant = TK_FS_ROMAN;
	} else {
	    faPtr->slant = TK_FS_ITALIC;
	}
    }
    if (FieldSpecified(field[XLFD_SETWIDTH])) {
	xaPtr->setwidth = TkFindStateNum(NULL, NULL, xlfdSetwidthMap,
		field[XLFD_SETWIDTH]);
    }

    /* XLFD_ADD_STYLE ignored. */

    /*
     * Pointsize in tenths of a point, but treat it as tenths of a pixel for
     * historical compatibility.
     */

    faPtr->size = 12;

    if (FieldSpecified(field[XLFD_POINT_SIZE])) {
	if (field[XLFD_POINT_SIZE][0] == '[') {
	    /*
	     * Some X fonts have the point size specified as follows:
	     *
	     *	    [ N1 N2 N3 N4 ]
	     *
	     * where N1 is the point size (in points, not decipoints!), and
	     * N2, N3, and N4 are some additional numbers that I don't know
	     * the purpose of, so I ignore them.
	     */

	    faPtr->size = atoi(field[XLFD_POINT_SIZE] + 1);
	} else if (Tcl_GetInt(NULL, field[XLFD_POINT_SIZE],
		&faPtr->size) == TCL_OK) {
	    faPtr->size /= 10;
	} else {
	    return TCL_ERROR;
	}
    }

    /*
     * Pixel height of font. If specified, overrides pointsize.
     */

    if (FieldSpecified(field[XLFD_PIXEL_SIZE])) {
	if (field[XLFD_PIXEL_SIZE][0] == '[') {
	    /*
	     * Some X fonts have the pixel size specified as follows:
	     *
	     *	    [ N1 N2 N3 N4 ]
	     *
	     * where N1 is the pixel size, and where N2, N3, and N4 are some
	     * additional numbers that I don't know the purpose of, so I
	     * ignore them.
	     */

	    faPtr->size = atoi(field[XLFD_PIXEL_SIZE] + 1);
	} else if (Tcl_GetInt(NULL, field[XLFD_PIXEL_SIZE],
		&faPtr->size) != TCL_OK) {
	    return TCL_ERROR;
	}
    }

    faPtr->size = -faPtr->size;

    /* XLFD_RESOLUTION_X ignored. */

    /* XLFD_RESOLUTION_Y ignored. */

    /* XLFD_SPACING ignored. */

    /* XLFD_AVERAGE_WIDTH ignored. */

    if (FieldSpecified(field[XLFD_CHARSET])) {
	xaPtr->charset = Tk_GetUid(field[XLFD_CHARSET]);
    } else {
	xaPtr->charset = Tk_GetUid("iso8859-1");
    }
    Tcl_DStringFree(&ds);
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * FieldSpecified --
 *
 *	Helper function for TkParseXLFD(). Determines if a field in the XLFD
 *	was set to a non-null, non-don't-care value.
 *
 * Results:
 *	The return value is 0 if the field in the XLFD was not set and should
 *	be ignored, non-zero otherwise.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

static int
FieldSpecified(
    const char *field)		/* The field of the XLFD to check. Strictly
				 * speaking, only when the string is "*" does
				 * it mean don't-care. However, an unspecified
				 * or question mark is also interpreted as
				 * don't-care. */
{
    char ch;

    if (field == NULL) {
	return 0;
    }
    ch = field[0];
    return (ch != '*' && ch != '?');
}

/*
 *---------------------------------------------------------------------------
 *
 * TkFontGetPixels --
 *
 *	Given a font size specification (as described in the TkFontAttributes
 *	structure) return the number of pixels it represents.
 *
 * Results:
 *	As above.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
TkFontGetPixels(
    Tk_Window tkwin,		/* For point->pixel conversion factor. */
    int size)			/* Font size. */
{
    double d;

    if (size < 0) {
	return -size;
    }

    d = size * 25.4 / 72.0;
    d *= WidthOfScreen(Tk_Screen(tkwin));
    d /= WidthMMOfScreen(Tk_Screen(tkwin));
    return (int) (d + 0.5);
}

/*
 *---------------------------------------------------------------------------
 *
 * TkFontGetPoints --
 *
 *	Given a font size specification (as described in the TkFontAttributes
 *	structure) return the number of points it represents.
 *
 * Results:
 *	As above.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
TkFontGetPoints(
    Tk_Window tkwin,		/* For pixel->point conversion factor. */
    int size)			/* Font size. */
{
    double d;

    if (size >= 0) {
	return size;
    }

    d = -size * 72.0 / 25.4;
    d *= WidthMMOfScreen(Tk_Screen(tkwin));
    d /= WidthOfScreen(Tk_Screen(tkwin));
    return (int) (d + 0.5);
}

/*
 *-------------------------------------------------------------------------
 *
 * TkFontGetAliasList --
 *
 *	Given a font name, find the list of all aliases for that font name.
 *	One of the names in this list will probably be the name that this
 *	platform expects when asking for the font.
 *
 * Results:
 *	As above. The return value is NULL if the font name has no aliases.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------------
 */

const char *const *
TkFontGetAliasList(
    const char *faceName)	/* Font name to test for aliases. */
{
    int i, j;

    for (i = 0; fontAliases[i] != NULL; i++) {
	for (j = 0; fontAliases[i][j] != NULL; j++) {
	    if (strcasecmp(faceName, fontAliases[i][j]) == 0) {
		return fontAliases[i];
	    }
	}
    }
    return NULL;
}

/*
 *-------------------------------------------------------------------------
 *
 * TkFontGetFallbacks --
 *
 *	Get the list of font fallbacks that the platform-specific code can use
 *	to try to find the closest matching font the name requested.
 *
 * Results:
 *	As above.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------------
 */

const char *const *const *
TkFontGetFallbacks(void)
{
    return fontFallbacks;
}

/*
 *-------------------------------------------------------------------------
 *
 * TkFontGetGlobalClass --
 *
 *	Get the list of fonts to try if the requested font name does not
 *	exist and no fallbacks for that font name could be used either.
 *	The names in this list are considered preferred over all the other
 *	font names in the system when looking for a last-ditch fallback.
 *
 * Results:
 *	As above.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------------
 */

const char *const *
TkFontGetGlobalClass(void)
{
    return globalFontClass;
}

/*
 *-------------------------------------------------------------------------
 *
 * TkFontGetSymbolClass --
 *
 *	Get the list of fonts that are symbolic; used if the operating system
 *	cannot apriori identify symbolic fonts on its own.
 *
 * Results:
 *	As above.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------------
 */

const char *const *
TkFontGetSymbolClass(void)
{
    return symbolClass;
}

/*
 *----------------------------------------------------------------------
 *
 * TkDebugFont --
 *
 *	This function returns debugging information about a font.
 *
 * Results:
 *	The return value is a list with one sublist for each TkFont
 *	corresponding to "name". Each sublist has two elements that contain
 *	the resourceRefCount and objRefCount fields from the TkFont structure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TkDebugFont(
    Tk_Window tkwin,		/* The window in which the font will be used
				 * (not currently used). */
    const char *name)		/* Name of the desired color. */
{
    TkFont *fontPtr;
    Tcl_HashEntry *hashPtr;
    Tcl_Obj *resultPtr, *objPtr;

    resultPtr = Tcl_NewObj();
    hashPtr = Tcl_FindHashEntry(
	    &((TkWindow *) tkwin)->mainPtr->fontInfoPtr->fontCache, name);
    if (hashPtr != NULL) {
	fontPtr = Tcl_GetHashValue(hashPtr);
	if (fontPtr == NULL) {
	    Tcl_Panic("TkDebugFont found empty hash table entry");
	}
	for ( ; (fontPtr != NULL); fontPtr = fontPtr->nextPtr) {
	    objPtr = Tcl_NewObj();
	    Tcl_ListObjAppendElement(NULL, objPtr,
		    Tcl_NewIntObj(fontPtr->resourceRefCount));
	    Tcl_ListObjAppendElement(NULL, objPtr,
		    Tcl_NewIntObj(fontPtr->objRefCount));
	    Tcl_ListObjAppendElement(NULL, resultPtr, objPtr);
	}
    }
    return resultPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TkFontGetFirstTextLayout --
 *
 *	This function returns the first chunk of a Tk_TextLayout, i.e. until
 *	the first font change on the first line (or the whole first line if
 *	there is no such font change).
 *
 * Results:
 *	The return value is the byte length of the chunk, the chunk itself is
 *	copied into dst and its Tk_Font into font.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TkFontGetFirstTextLayout(
    Tk_TextLayout layout,	/* Layout information, from a previous call to
				 * Tk_ComputeTextLayout(). */
    Tk_Font *font,
    char *dst)
{
    TextLayout *layoutPtr = (TextLayout *) layout;
    LayoutChunk *chunkPtr;
    int numBytesInChunk;

    if ((layoutPtr == NULL) || (layoutPtr->numChunks == 0)
	    || (layoutPtr->chunks->numDisplayChars <= 0)) {
	dst[0] = '\0';
	return 0;
    }
    chunkPtr = layoutPtr->chunks;
    numBytesInChunk = chunkPtr->numBytes;
    strncpy(dst, chunkPtr->start, (size_t) numBytesInChunk);
    *font = layoutPtr->tkfont;
    return numBytesInChunk;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */