Source

emacs / src / fontset.c

Full commit
   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
/* Fontset handler.
   Copyright (C) 1995, 1997, 2000 Electrotechnical Laboratory, JAPAN.
   Licensed to the Free Software Foundation.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* #define FONTSET_DEBUG */

#include <config.h>

#ifdef FONTSET_DEBUG
#include <stdio.h>
#endif

#include "lisp.h"
#include "buffer.h"
#include "charset.h"
#include "ccl.h"
#include "frame.h"
#include "dispextern.h"
#include "fontset.h"
#include "window.h"

#ifdef FONTSET_DEBUG
#undef xassert
#define xassert(X)	do {if (!(X)) abort ();} while (0)
#undef INLINE
#define INLINE
#endif


/* FONTSET

   A fontset is a collection of font related information to give
   similar appearance (style, size, etc) of characters.  There are two
   kinds of fontsets; base and realized.  A base fontset is created by
   new-fontset from Emacs Lisp explicitly.  A realized fontset is
   created implicitly when a face is realized for ASCII characters.  A
   face is also realized for multibyte characters based on an ASCII
   face.  All of the multibyte faces based on the same ASCII face
   share the same realized fontset.
   
   A fontset object is implemented by a char-table.

   An element of a base fontset is:
	(INDEX . FONTNAME) or
	(INDEX . (FOUNDRY . REGISTRY ))
   FONTNAME is a font name pattern for the corresponding character.
   FOUNDRY and REGISTRY are respectively foundy and regisry fields of
   a font name for the corresponding character.  INDEX specifies for
   which character (or generic character) the element is defined.  It
   may be different from an index to access this element.  For
   instance, if a fontset defines some font for all characters of
   charset `japanese-jisx0208', INDEX is the generic character of this
   charset.  REGISTRY is the

   An element of a realized fontset is FACE-ID which is a face to use
   for displaying the correspnding character.

   All single byte charaters (ASCII and 8bit-unibyte) share the same
   element in a fontset.  The element is stored in the first element
   of the fontset.

   To access or set each element, use macros FONTSET_REF and
   FONTSET_SET respectively for efficiency.

   A fontset has 3 extra slots.

   The 1st slot is an ID number of the fontset.

   The 2nd slot is a name of the fontset.  This is nil for a realized
   face.

   The 3rd slot is a frame that the fontset belongs to.  This is nil
   for a default face.

   A parent of a base fontset is nil.  A parent of a realized fontset
   is a base fontset.

   All fontsets (except for the default fontset described below) are
   recorded in Vfontset_table.


   DEFAULT FONTSET

   There's a special fontset named `default fontset' which defines a
   default fontname that contains only REGISTRY field for each
   character.  When a base fontset doesn't specify a font for a
   specific character, the corresponding value in the default fontset
   is used.  The format is the same as a base fontset.

   The parent of realized fontsets created for faces that have no
   fontset is the default fontset.


   These structures are hidden from the other codes than this file.
   The other codes handle fontsets only by their ID numbers.  They
   usually use variable name `fontset' for IDs.  But, in this file, we
   always use varialbe name `id' for IDs, and name `fontset' for the
   actual fontset objects.

*/

/********** VARIABLES and FUNCTION PROTOTYPES **********/

extern Lisp_Object Qfont;
Lisp_Object Qfontset;

/* Vector containing all fontsets.  */
static Lisp_Object Vfontset_table;

/* Next possibly free fontset ID.  Usually this keeps the mininum
   fontset ID not yet used.  */
static int next_fontset_id;

/* The default fontset.  This gives default FAMILY and REGISTRY of
   font for each characters.  */
static Lisp_Object Vdefault_fontset;

Lisp_Object Vfont_encoding_alist;
Lisp_Object Vuse_default_ascent;
Lisp_Object Vignore_relative_composition;
Lisp_Object Valternate_fontname_alist;
Lisp_Object Vfontset_alias_alist;
Lisp_Object Vhighlight_wrong_size_font;
Lisp_Object Vclip_large_size_font;
Lisp_Object Vvertical_centering_font_regexp;

/* The following six are declarations of callback functions depending
   on window system.  See the comments in src/fontset.h for more
   detail.  */

/* Return a pointer to struct font_info of font FONT_IDX of frame F.  */
struct font_info *(*get_font_info_func) P_ ((FRAME_PTR f, int font_idx));

/* Return a list of font names which matches PATTERN.  See the document of
   `x-list-fonts' for more detail.  */
Lisp_Object (*list_fonts_func) P_ ((struct frame *f,
				    Lisp_Object pattern,
				    int size,
				    int maxnames));

/* Load a font named NAME for frame F and return a pointer to the
   information of the loaded font.  If loading is failed, return 0.  */
struct font_info *(*load_font_func) P_ ((FRAME_PTR f, char *name, int));

/* Return a pointer to struct font_info of a font named NAME for frame F.  */
struct font_info *(*query_font_func) P_ ((FRAME_PTR f, char *name));

/* Additional function for setting fontset or changing fontset
   contents of frame F.  */
void (*set_frame_fontset_func) P_ ((FRAME_PTR f, Lisp_Object arg,
				    Lisp_Object oldval));

/* To find a CCL program, fs_load_font calls this function.
   The argument is a pointer to the struct font_info.
   This function set the memer `encoder' of the structure.  */
void (*find_ccl_program_func) P_ ((struct font_info *));

/* Check if any window system is used now.  */
void (*check_window_system_func) P_ ((void));


/* Prototype declarations for static functions.  */
static Lisp_Object fontset_ref P_ ((Lisp_Object, int));
static void fontset_set P_ ((Lisp_Object, int, Lisp_Object));
static Lisp_Object make_fontset P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
static int fontset_id_valid_p P_ ((int));
static Lisp_Object fontset_pattern_regexp P_ ((Lisp_Object));
static Lisp_Object font_family_registry P_ ((Lisp_Object));


/********** MACROS AND FUNCTIONS TO HANDLE FONTSET **********/

/* Macros for Lisp vector.  */
#define AREF(V, IDX)	XVECTOR (V)->contents[IDX]
#define ASIZE(V)	XVECTOR (V)->size

/* Return the fontset with ID.  No check of ID's validness.  */
#define FONTSET_FROM_ID(id) AREF (Vfontset_table, id)

/* Macros to access extra, default, and parent slots, of fontset.  */
#define FONTSET_ID(fontset)		XCHAR_TABLE (fontset)->extras[0]
#define FONTSET_NAME(fontset)		XCHAR_TABLE (fontset)->extras[1]
#define FONTSET_FRAME(fontset)		XCHAR_TABLE (fontset)->extras[2]
#define FONTSET_ASCII(fontset)		XCHAR_TABLE (fontset)->contents[0]
#define FONTSET_BASE(fontset)		XCHAR_TABLE (fontset)->parent

#define BASE_FONTSET_P(fontset)		NILP (FONTSET_BASE(fontset))


/* Return the element of FONTSET (char-table) at index C (character).  */

#define FONTSET_REF(fontset, c)	fontset_ref (fontset, c)

static INLINE Lisp_Object
fontset_ref (fontset, c)
     Lisp_Object fontset;
     int c;
{
  int charset, c1, c2;
  Lisp_Object elt, defalt;
  int i;

  if (SINGLE_BYTE_CHAR_P (c))
    return FONTSET_ASCII (fontset);

  SPLIT_CHAR (c, charset, c1, c2);
  elt = XCHAR_TABLE (fontset)->contents[charset + 128];
  if (!SUB_CHAR_TABLE_P (elt))
    return elt;
  defalt = XCHAR_TABLE (elt)->defalt;
  if (c1 < 32
      || (elt = XCHAR_TABLE (elt)->contents[c1],
	  NILP (elt)))
    return defalt;
  if (!SUB_CHAR_TABLE_P (elt))
    return elt;
  defalt = XCHAR_TABLE (elt)->defalt;
  if (c2 < 32
      || (elt = XCHAR_TABLE (elt)->contents[c2],
	  NILP (elt)))
    return defalt;
  return elt;
}


#define FONTSET_REF_VIA_BASE(fontset, c) fontset_ref_via_base (fontset, &c)

static INLINE Lisp_Object
fontset_ref_via_base (fontset, c)
     Lisp_Object fontset;
     int *c;
{
  int charset, c1, c2;
  Lisp_Object elt;

  if (SINGLE_BYTE_CHAR_P (*c))
    return FONTSET_ASCII (fontset);

  elt = FONTSET_REF (FONTSET_BASE (fontset), *c);
  if (NILP (elt) && ! EQ (fontset, Vdefault_fontset))
    elt = FONTSET_REF (Vdefault_fontset, *c);
  if (NILP (elt))
    return Qnil;

  *c = XINT (XCAR (elt));
  SPLIT_CHAR (*c, charset, c1, c2);
  elt = XCHAR_TABLE (fontset)->contents[charset + 128];
  if (c1 < 32)
    return (SUB_CHAR_TABLE_P (elt) ? XCHAR_TABLE (elt)->defalt : elt);
  if (!SUB_CHAR_TABLE_P (elt))
    return Qnil;
  elt = XCHAR_TABLE (elt)->contents[c1];
  if (c2 < 32)
    return (SUB_CHAR_TABLE_P (elt) ? XCHAR_TABLE (elt)->defalt : elt);
  if (!SUB_CHAR_TABLE_P (elt))
    return Qnil;
  elt = XCHAR_TABLE (elt)->contents[c2];
  return elt;
}


/* Store into the element of FONTSET at index C the value NEWETL.  */
#define FONTSET_SET(fontset, c, newelt) fontset_set(fontset, c, newelt)

static void
fontset_set (fontset, c, newelt)
     Lisp_Object fontset;
     int c;
     Lisp_Object newelt;
{
  int charset, code[3];
  Lisp_Object *elt, tmp;
  int i, j;

  if (SINGLE_BYTE_CHAR_P (c))
    {
      FONTSET_ASCII (fontset) = newelt;
      return;
    }

  SPLIT_CHAR (c, charset, code[0], code[1]);
  code[2] = 0;			/* anchor */
  elt = &XCHAR_TABLE (fontset)->contents[charset + 128];
  for (i = 0; code[i] > 0; i++)
    {
      if (!SUB_CHAR_TABLE_P (*elt))
	*elt = make_sub_char_table (*elt);
      elt = &XCHAR_TABLE (*elt)->contents[code[i]];
    }
  if (SUB_CHAR_TABLE_P (*elt))
    XCHAR_TABLE (*elt)->defalt = newelt;
  else
    *elt = newelt;
}


/* Return a newly created fontset with NAME.  If BASE is nil, make a
   base fontset.  Otherwise make a realized fontset whose parent is
   BASE.  */

static Lisp_Object
make_fontset (frame, name, base)
     Lisp_Object frame, name, base;
{
  Lisp_Object fontset, elt, base_elt;
  int size = ASIZE (Vfontset_table);
  int id = next_fontset_id;
  int i, j;

  /* Find a free slot in Vfontset_table.  Usually, next_fontset_id is
     the next available fontset ID.  So it is expected that this loop
     terminates quickly.  In addition, as the last element of
     Vfotnset_table is always nil, we don't have to check the range of
     id.  */
  while (!NILP (AREF (Vfontset_table, id))) id++;

  if (id + 1 == size)
    {
      Lisp_Object tem;
      int i; 

      tem = Fmake_vector (make_number (size + 8), Qnil);
      for (i = 0; i < size; i++)
	AREF (tem, i) = AREF (Vfontset_table, i);
      Vfontset_table = tem;
    }

  fontset = Fmake_char_table (Qfontset, Qnil);

  FONTSET_ID (fontset) = make_number (id);
  FONTSET_NAME (fontset) = name;
  FONTSET_FRAME (fontset) = frame;
  FONTSET_BASE (fontset) = base;

  AREF (Vfontset_table, id) = fontset;
  next_fontset_id = id + 1;
  return fontset;
}


/* Return 1 if ID is a valid fontset id, else return 0.  */

static INLINE int
fontset_id_valid_p (id)
     int id;
{
  return (id >= 0 && id < ASIZE (Vfontset_table) - 1);
}


/* Extract `family' and `registry' string from FONTNAME and set in
   *FAMILY and *REGISTRY respectively.  Actually, `family' may also
   contain `foundry', `registry' may also contain `encoding' of
   FONTNAME.  */

static Lisp_Object
font_family_registry (fontname)
     Lisp_Object fontname;
{
  Lisp_Object family, registry;
  char *p = XSTRING (fontname)->data;
  char *sep[15];
  int i = 0;
  
  while (*p && i < 15) if (*p++ == '-') sep[i++] = p;
  if (i != 14)
    return fontname;

  family = make_unibyte_string (sep[0], sep[2] - 1 - sep[0]);
  registry = make_unibyte_string (sep[12], p - sep[12]);
  return Fcons (family, registry);
}


/********** INTERFACES TO xfaces.c and dispextern.h **********/ 

/* Return name of the fontset with ID.  */

Lisp_Object
fontset_name (id)
     int id;
{
  Lisp_Object fontset;
  fontset = FONTSET_FROM_ID (id);
  return FONTSET_NAME (fontset);
}


/* Return ASCII font name of the fontset with ID.  */

Lisp_Object
fontset_ascii (id)
     int id;
{
  Lisp_Object fontset, elt;
  fontset= FONTSET_FROM_ID (id);
  elt = FONTSET_ASCII (fontset);
  return XCDR (elt);
}


/* Free fontset of FACE.  Called from free_realized_face.  */

void
free_face_fontset (f, face)
     FRAME_PTR f;
     struct face *face;
{
  if (fontset_id_valid_p (face->fontset))
    {
      AREF (Vfontset_table, face->fontset) = Qnil;
      if (face->fontset < next_fontset_id)
	next_fontset_id = face->fontset;
    }
}


/* Return 1 iff FACE is suitable for displaying character C.
   Otherwise return 0.  Called from the macro FACE_SUITABLE_FOR_CHAR_P
   when C is not a single byte character..  */

int
face_suitable_for_char_p (face, c)
     struct face *face;
     int c;
{
  Lisp_Object fontset, elt;

  if (SINGLE_BYTE_CHAR_P (c))
    return (face == face->ascii_face);

  xassert (fontset_id_valid_p (face->fontset));
  fontset = FONTSET_FROM_ID (face->fontset);
  xassert (!BASE_FONTSET_P (fontset));

  elt = FONTSET_REF_VIA_BASE (fontset, c);
  return (!NILP (elt) && face->id == XFASTINT (elt));
}


/* Return ID of face suitable for displaying character C on frame F.
   The selection of face is done based on the fontset of FACE.  FACE
   should already have been realized for ASCII characters.  Called
   from the macro FACE_FOR_CHAR when C is not a single byte character.  */

int
face_for_char (f, face, c)
     FRAME_PTR f;
     struct face *face;
     int c;
{
  Lisp_Object fontset, elt;
  int face_id;

  xassert (fontset_id_valid_p (face->fontset));
  fontset = FONTSET_FROM_ID (face->fontset);
  xassert (!BASE_FONTSET_P (fontset));

  elt = FONTSET_REF_VIA_BASE (fontset, c);
  if (!NILP (elt))
    return XINT (elt);

  /* No face is recorded for C in the fontset of FACE.  Make a new
     realized face for C that has the same fontset.  */
  face_id = lookup_face (f, face->lface, c, face);
  
  /* Record the face ID in FONTSET at the same index as the
     information in the base fontset.  */
  FONTSET_SET (fontset, c, make_number (face_id));
  return face_id;
}


/* Make a realized fontset for ASCII face FACE on frame F from the
   base fontset BASE_FONTSET_ID.  If BASE_FONTSET_ID is -1, use the
   default fontset as the base.  Value is the id of the new fontset.
   Called from realize_x_face.  */

int
make_fontset_for_ascii_face (f, base_fontset_id)
     FRAME_PTR f;
     int base_fontset_id;
{
  Lisp_Object base_fontset, fontset, name, frame;

  XSETFRAME (frame, f);
  if (base_fontset_id >= 0)
    {
      base_fontset = FONTSET_FROM_ID (base_fontset_id);
      if (!BASE_FONTSET_P (base_fontset))
	base_fontset = FONTSET_BASE (base_fontset);
      xassert (BASE_FONTSET_P (base_fontset));
    }
  else
    base_fontset = Vdefault_fontset;

  fontset = make_fontset (frame, Qnil, base_fontset);
  return XINT (FONTSET_ID (fontset));
}


/* Return the font name pattern for C that is recorded in the fontset
   with ID.  A font is opened by that pattern to get the fullname.  If
   the fullname conform to XLFD, extract foundry-family field and
   registry-encoding field, and return the cons of them.  Otherwise
   return the fullname.  If ID is -1, or the fontset doesn't contain
   information about C, get the registry and encoding of C from the
   default fontset.  Called from choose_face_font.  */

Lisp_Object
fontset_font_pattern (f, id, c)
     FRAME_PTR f;
     int id, c;
{
  Lisp_Object fontset, elt;
  struct font_info *fontp;
  Lisp_Object family_registry;
  
  elt = Qnil;
  if (fontset_id_valid_p (id))
    {
      fontset = FONTSET_FROM_ID (id);
      xassert (!BASE_FONTSET_P (fontset));
      fontset = FONTSET_BASE (fontset);
      elt = FONTSET_REF (fontset, c);
    }
  if (NILP (elt))
    elt = FONTSET_REF (Vdefault_fontset, c);

  if (!CONSP (elt))
    return Qnil;
  if (CONSP (XCDR (elt)))
    return XCDR (elt);

  /* The fontset specifies only a font name pattern (not cons of
     family and registry).  Try to open a font by that pattern and get
     a registry from the full name of the opened font.  We ignore
     family name here because it should be wild card in the fontset
     specification.  */
  elt = XCDR (elt);
  xassert (STRINGP (elt));
  fontp = FS_LOAD_FONT (f, c, XSTRING (elt)->data, -1);
  if (!fontp)
    return Qnil;

  family_registry = font_family_registry (build_string (fontp->full_name));
  if (!CONSP (family_registry))
    return family_registry;
  XCAR (family_registry) = Qnil;
  return family_registry;
}


/* Load a font named FONTNAME to display character C on frame F.
   Return a pointer to the struct font_info of the loaded font.  If
   loading fails, return NULL.  If FACE is non-zero and a fontset is
   assigned to it, record FACE->id in the fontset for C.  If FONTNAME
   is NULL, the name is taken from the fontset of FACE or what
   specified by ID.  */

struct font_info *
fs_load_font (f, c, fontname, id, face)
     FRAME_PTR f;
     int c;
     char *fontname;
     int id;
     struct face *face;
{
  Lisp_Object fontset;
  Lisp_Object list, elt;
  int font_idx;
  int size = 0;
  struct font_info *fontp;
  int charset = CHAR_CHARSET (c);

  if (face)
    id = face->fontset;
  if (id < 0)
    fontset = Qnil;
  else
    fontset = FONTSET_FROM_ID (id);

  if (!NILP (fontset)
      && !BASE_FONTSET_P (fontset))
    {
      elt = FONTSET_REF_VIA_BASE (fontset, c);
      if (!NILP (elt))
	{
	  /* A suitable face for C is already recorded, which means
	     that a proper font is already loaded.  */
	  int face_id = XINT (elt);

	  xassert (face_id == face->id);
	  face = FACE_FROM_ID (f, face_id);
	  return (*get_font_info_func) (f, face->font_info_id);
	}

      if (!fontname && charset == CHARSET_ASCII)
	{
	  elt = FONTSET_ASCII (fontset);
	  fontname = XSTRING (XCDR (elt))->data;
	}
    }

  if (!fontname)
    /* No way to get fontname.  */
    return 0;

  fontp = (*load_font_func) (f, fontname, size);
  if (!fontp)
    return 0;

  /* Fill in members (charset, vertical_centering, encoding, etc) of
     font_info structure that are not set by (*load_font_func).  */
  fontp->charset = charset;

  fontp->vertical_centering
    = (STRINGP (Vvertical_centering_font_regexp)
       && (fast_c_string_match_ignore_case 
	   (Vvertical_centering_font_regexp, fontp->full_name) >= 0));

  if (fontp->encoding[1] != FONT_ENCODING_NOT_DECIDED)
    {
      /* The font itself tells which code points to be used.  Use this
	 encoding for all other charsets.  */
      int i;

      fontp->encoding[0] = fontp->encoding[1];
      for (i = MIN_CHARSET_OFFICIAL_DIMENSION1; i <= MAX_CHARSET; i++)
	fontp->encoding[i] = fontp->encoding[1];
    }
  else
    {
      /* The font itself doesn't have information about encoding.  */
      int i;

      fontname = fontp->full_name;
      /* By default, encoding of ASCII chars is 0 (i.e. 0x00..0x7F),
	 others is 1 (i.e. 0x80..0xFF).  */
      fontp->encoding[0] = 0;
      for (i = MIN_CHARSET_OFFICIAL_DIMENSION1; i <= MAX_CHARSET; i++)
	fontp->encoding[i] = 1;
      /* Then override them by a specification in Vfont_encoding_alist.  */
      for (list = Vfont_encoding_alist; CONSP (list); list = XCDR (list))
	{
	  elt = XCAR (list);
	  if (CONSP (elt)
	      && STRINGP (XCAR (elt)) && CONSP (XCDR (elt))
	      && (fast_c_string_match_ignore_case (XCAR (elt), fontname)
		  >= 0))
	    {
	      Lisp_Object tmp;

	      for (tmp = XCDR (elt); CONSP (tmp); tmp = XCDR (tmp))
		if (CONSP (XCAR (tmp))
		    && ((i = get_charset_id (XCAR (XCAR (tmp))))
			>= 0)
		    && INTEGERP (XCDR (XCAR (tmp)))
		    && XFASTINT (XCDR (XCAR (tmp))) < 4)
		  fontp->encoding[i]
		    = XFASTINT (XCDR (XCAR (tmp)));
	    }
	}
    }

  fontp->font_encoder = (struct ccl_program *) 0;

  if (find_ccl_program_func)
    (*find_ccl_program_func) (fontp);

  /* If we loaded a font for a face that has fontset, record the face
     ID in the fontset for C.  */
  if (face
      && !NILP (fontset)
      && !BASE_FONTSET_P (fontset))
    FONTSET_SET (fontset, c, make_number (face->id));
  return fontp;
}


/* Cache data used by fontset_pattern_regexp.  The car part is a
   pattern string containing at least one wild card, the cdr part is
   the corresponding regular expression.  */
static Lisp_Object Vcached_fontset_data;

#define CACHED_FONTSET_NAME (XSTRING (XCAR (Vcached_fontset_data))->data)
#define CACHED_FONTSET_REGEX (XCDR (Vcached_fontset_data))

/* If fontset name PATTERN contains any wild card, return regular
   expression corresponding to PATTERN.  */

static Lisp_Object
fontset_pattern_regexp (pattern)
     Lisp_Object pattern;
{
  if (!index (XSTRING (pattern)->data, '*')
      && !index (XSTRING (pattern)->data, '?'))
    /* PATTERN does not contain any wild cards.  */
    return Qnil;

  if (!CONSP (Vcached_fontset_data)
      || strcmp (XSTRING (pattern)->data, CACHED_FONTSET_NAME))
    {
      /* We must at first update the cached data.  */
      char *regex = (char *) alloca (XSTRING (pattern)->size * 2);
      char *p0, *p1 = regex;

      /* Convert "*" to ".*", "?" to ".".  */
      *p1++ = '^';
      for (p0 = (char *) XSTRING (pattern)->data; *p0; p0++)
	{
	  if (*p0 == '*')
	    {
	      *p1++ = '.';
	      *p1++ = '*';
	    }
	  else if (*p0 == '?')
	    *p1++ = '.';
	  else
	    *p1++ = *p0;
	}
      *p1++ = '$';
      *p1++ = 0;

      Vcached_fontset_data = Fcons (build_string (XSTRING (pattern)->data),
				    build_string (regex));
    }

  return CACHED_FONTSET_REGEX;
}

/* Return ID of the base fontset named NAME.  If there's no such
   fontset, return -1.  */

int
fs_query_fontset (name, regexpp)
     Lisp_Object name;
     int regexpp;
{
  Lisp_Object fontset, tem;
  int i;

  name = Fdowncase (name);
  if (!regexpp)
    {
      tem = Frassoc (name, Vfontset_alias_alist);
      if (CONSP (tem) && STRINGP (XCAR (tem)))
	name = XCAR (tem);
      else
	{
	  tem = fontset_pattern_regexp (name);
	  if (STRINGP (tem))
	    {
	      name = tem;
	      regexpp = 1;
	    }
	}
    }

  for (i = 0; i < ASIZE (Vfontset_table); i++)
    {
      Lisp_Object fontset;
      unsigned char *this_name;

      fontset = FONTSET_FROM_ID (i);
      if (NILP (fontset)
	  || !BASE_FONTSET_P (fontset))
	continue;

      this_name = XSTRING (FONTSET_NAME (fontset))->data;
      if (regexpp
	  ? fast_c_string_match_ignore_case (name, this_name) >= 0
	  : !strcmp (XSTRING (name)->data, this_name))
	return i;
    }
  return -1;
}


DEFUN ("query-fontset", Fquery_fontset, Squery_fontset, 1, 2, 0,
  "Return the name of a fontset that matches PATTERN.\n\
The value is nil if there is no matching fontset.\n\
PATTERN can contain `*' or `?' as a wildcard\n\
just as X font name matching algorithm allows.\n\
If REGEXPP is non-nil, PATTERN is a regular expression.")
  (pattern, regexpp)
     Lisp_Object pattern, regexpp;
{
  Lisp_Object fontset;
  int id;

  (*check_window_system_func) ();

  CHECK_STRING (pattern, 0);

  if (XSTRING (pattern)->size == 0)
    return Qnil;

  id = fs_query_fontset (pattern, !NILP (regexpp));
  if (id < 0)
    return Qnil;

  fontset = FONTSET_FROM_ID (id);
  return FONTSET_NAME (fontset);
}

/* Return a list of base fontset names matching PATTERN on frame F.
   If SIZE is not 0, it is the size (maximum bound width) of fontsets
   to be listed. */

Lisp_Object
list_fontsets (f, pattern, size)
     FRAME_PTR f;
     Lisp_Object pattern;
     int size;
{
  Lisp_Object frame, regexp, val, tail;
  int id;

  XSETFRAME (frame, f);

  regexp = fontset_pattern_regexp (pattern);
  val = Qnil;

  for (id = 0; id < ASIZE (Vfontset_table); id++)
    {
      Lisp_Object fontset;
      unsigned char *name;

      fontset = FONTSET_FROM_ID (id);
      if (NILP (fontset)
	  || !BASE_FONTSET_P (fontset)
	  || !EQ (frame, FONTSET_FRAME (fontset)))
	continue;
      name = XSTRING (FONTSET_NAME (fontset))->data;

      if (!NILP (regexp)
	  ? (fast_c_string_match_ignore_case (regexp, name) < 0)
	  : strcmp (XSTRING (pattern)->data, name))
	continue;

      if (size)
	{
	  struct font_info *fontp;
	  fontp = FS_LOAD_FONT (f, 0, NULL, id);
	  if (!fontp || size != fontp->size)
	    continue;
	}
      val = Fcons (Fcopy_sequence (FONTSET_NAME (fontset)), val);
    }

  return val;
}

DEFUN ("new-fontset", Fnew_fontset, Snew_fontset, 2, 2, 0,
  "Create a new fontset NAME that contains font information in FONTLIST.\n\
FONTLIST is an alist of charsets vs corresponding font name patterns.")
  (name, fontlist)
     Lisp_Object name, fontlist;
{
  Lisp_Object fontset, elements, ascii_font;
  Lisp_Object tem, tail, elt;

  (*check_window_system_func) ();

  CHECK_STRING (name, 0);
  CHECK_LIST (fontlist, 1);

  name = Fdowncase (name);
  tem = Fquery_fontset (name, Qnil);
  if (!NILP (tem))
    error ("Fontset `%s' matches the existing fontset `%s'",
	   XSTRING (name)->data, XSTRING (tem)->data);

  /* Check the validity of FONTLIST while creating a template for
     fontset elements.  */
  elements = ascii_font = Qnil;
  for (tail = fontlist; CONSP (tail); tail = XCDR (tail))
    {
      Lisp_Object family, registry;
      int c, charset;

      tem = XCAR (tail);
      if (!CONSP (tem)
	  || (charset = get_charset_id (XCAR (tem))) < 0
	  || !STRINGP (XCDR (tem)))
	error ("Elements of fontlist must be a cons of charset and font name");

      tem = Fdowncase (XCDR (tem));
      if (charset == CHARSET_ASCII)
	ascii_font = tem;
      else
	{
	  c = MAKE_CHAR (charset, 0, 0);
	  elements = Fcons (Fcons (make_number (c), tem), elements);
	}
    }

  if (NILP (ascii_font))
    error ("No ASCII font in the fontlist");

  fontset = make_fontset (Qnil, name, Qnil);
  FONTSET_ASCII (fontset) = Fcons (make_number (0), ascii_font);
  for (; CONSP (elements); elements = XCDR (elements))
    {
      elt = XCAR (elements);
      tem = Fcons (XCAR (elt), font_family_registry (XCDR (elt)));
      FONTSET_SET (fontset, XINT (XCAR (elt)), tem);
    }

  return Qnil;
}


/* Clear all elements of FONTSET for multibyte characters.  */

static void
clear_fontset_elements (fontset)
     Lisp_Object fontset;
{
  int i;

  for (i = CHAR_TABLE_SINGLE_BYTE_SLOTS; i < CHAR_TABLE_ORDINARY_SLOTS; i++)
    XCHAR_TABLE (fontset)->contents[i] = Qnil;
}


/* Check validity of NAME as a fontset name and return the
   corresponding fontset.  If not valid, signal an error.
   If NAME is t, return Vdefault_fontset.  */

static Lisp_Object
check_fontset_name (name)
     Lisp_Object name;
{
  int id;

  if (EQ (name, Qt))
    return Vdefault_fontset;

  CHECK_STRING (name, 0);
  id = fs_query_fontset (name, 0);
  if (id < 0)
    error ("Fontset `%s' does not exist", XSTRING (name)->data);
  return FONTSET_FROM_ID (id);
}

DEFUN ("set-fontset-font", Fset_fontset_font, Sset_fontset_font, 3, 4, 0,
  "Modify fontset NAME to use FONTNAME for CHARACTER.\n\
\n\
CHARACTER may be a cons; (FROM . TO), where FROM and TO are\n\
non-generic characters.  In that case, use FONTNAME\n\
for all characters in the range FROM and TO (inclusive).\n\
CHARACTER may be a charset.   In that case, use FONTNAME\n\
for all character in the charsets.\n\
\n\
FONTNAME may be a cons; (FAMILY . REGISTRY), where FAMILY is a family\n\
name of a font, REGSITRY is a registry name of a font.")
  (name, character, fontname, frame)
     Lisp_Object name, character, fontname, frame;
{
  Lisp_Object fontset, elt;
  Lisp_Object realized;
  int from, to;
  int id;
  Lisp_Object family, registry;

  fontset = check_fontset_name (name);

  if (CONSP (character))
    {
      /* CH should be (FROM . TO) where FROM and TO are non-generic
	 characters.  */
      CHECK_NUMBER (XCAR (character), 1);
      CHECK_NUMBER (XCDR (character), 1);
      from = XINT (XCAR (character));
      to = XINT (XCDR (character));
      if (!char_valid_p (from, 0) || !char_valid_p (to, 0))
	error ("Character range should be by non-generic characters.");
      if (!NILP (name)
	  && (SINGLE_BYTE_CHAR_P (from) || SINGLE_BYTE_CHAR_P (to)))
	error ("Can't change font for a single byte character");
    }
  else if (SYMBOLP (character))
    {
      elt = Fget (character, Qcharset);
      if (!VECTORP (elt) || ASIZE (elt) < 1 || !NATNUMP (AREF (elt, 0)))
	error ("Invalid charset: %s", (XSYMBOL (character)->name)->data);
      from = MAKE_CHAR (XINT (AREF (elt, 0)), 0, 0);
      to = from;
    }
  else
    {
      CHECK_NUMBER (character, 1);
      from = XINT (character);
      to = from;
    }
  if (!char_valid_p (from, 1))
    invalid_character (from);
  if (SINGLE_BYTE_CHAR_P (from))
    error ("Can't change font for a single byte character");
  if (from < to)
    {
      if (!char_valid_p (to, 1))
	invalid_character (to);
      if (SINGLE_BYTE_CHAR_P (to))
	error ("Can't change font for a single byte character");
    }

  if (STRINGP (fontname))
    {
      fontname = Fdowncase (fontname);
      elt = Fcons (make_number (from), font_family_registry (fontname));
    }
  else
    {
      CHECK_CONS (fontname, 2);
      family = XCAR (fontname);
      registry = XCDR (fontname);
      if (!NILP (family))
	CHECK_STRING (family, 2);
      if (!NILP (registry))
	CHECK_STRING (registry, 2);
      elt = Fcons (make_number (from), Fcons (family, registry));
    }

  /* The arg FRAME is kept for backward compatibility.  We only check
     the validity.  */
  if (!NILP (frame))
    CHECK_LIVE_FRAME (frame, 3);

  for (; from <= to; from++)
    FONTSET_SET (fontset, from, elt);
  Foptimize_char_table (fontset);

  /* If there's a realized fontset REALIZED whose parent is FONTSET,
     clear all the elements of REALIZED and free all multibyte faces
     whose fontset is REALIZED.  This way, the specified character(s)
     are surely redisplayed by a correct font.  */
  for (id = 0; id < ASIZE (Vfontset_table); id++)
    {
      realized = AREF (Vfontset_table, id);
      if (!NILP (realized)
	  && !BASE_FONTSET_P (realized)
	  && EQ (FONTSET_BASE (realized), fontset))
	{
	  FRAME_PTR f = XFRAME (FONTSET_FRAME (realized));
	  clear_fontset_elements (realized);
	  free_realized_multibyte_face (f, id);
	}
    }

  return Qnil;
}

DEFUN ("font-info", Ffont_info, Sfont_info, 1, 2, 0,
  "Return information about a font named NAME on frame FRAME.\n\
If FRAME is omitted or nil, use the selected frame.\n\
The returned value is a vector of OPENED-NAME, FULL-NAME, CHARSET, SIZE,\n\
  HEIGHT, BASELINE-OFFSET, RELATIVE-COMPOSE, and DEFAULT-ASCENT,\n\
where\n\
  OPENED-NAME is the name used for opening the font,\n\
  FULL-NAME is the full name of the font,\n\
  SIZE is the maximum bound width of the font,\n\
  HEIGHT is the height of the font,\n\
  BASELINE-OFFSET is the upward offset pixels from ASCII baseline,\n\
  RELATIVE-COMPOSE and DEFAULT-ASCENT are the numbers controlling\n\
    how to compose characters.\n\
If the named font is not yet loaded, return nil.")
  (name, frame)
     Lisp_Object name, frame;
{
  FRAME_PTR f;
  struct font_info *fontp;
  Lisp_Object info;

  (*check_window_system_func) ();

  CHECK_STRING (name, 0);
  name = Fdowncase (name);
  if (NILP (frame))
    frame = selected_frame;
  CHECK_LIVE_FRAME (frame, 1);
  f = XFRAME (frame);

  if (!query_font_func)
    error ("Font query function is not supported");

  fontp = (*query_font_func) (f, XSTRING (name)->data);
  if (!fontp)
    return Qnil;

  info = Fmake_vector (make_number (7), Qnil);

  XVECTOR (info)->contents[0] = build_string (fontp->name);
  XVECTOR (info)->contents[1] = build_string (fontp->full_name);
  XVECTOR (info)->contents[2] = make_number (fontp->size);
  XVECTOR (info)->contents[3] = make_number (fontp->height);
  XVECTOR (info)->contents[4] = make_number (fontp->baseline_offset);
  XVECTOR (info)->contents[5] = make_number (fontp->relative_compose);
  XVECTOR (info)->contents[6] = make_number (fontp->default_ascent);

  return info;
}


/* Return the font name for the character at POSITION in the current
   buffer.  This is computed from all the text properties and overlays
   that apply to POSITION.  It returns nil in the following cases:

   (1) The window system doesn't have a font for the character (thus
   it is displayed by an empty box).

   (2) The character code is invalid.

   (3) The current buffer is not displayed in any window.

   In addition, the returned font name may not take into account of
   such redisplay engine hooks as what used in jit-lock-mode if
   POSITION is currently not visible.  */


DEFUN ("internal-char-font", Finternal_char_font, Sinternal_char_font, 1, 1, 0,
  "For internal use only.")
  (position)
     Lisp_Object position;
{
  int pos, pos_byte, dummy;
  int face_id;
  int c;
  Lisp_Object window;
  struct window *w;
  struct frame *f;
  struct face *face;

  CHECK_NUMBER_COERCE_MARKER (position, 0);
  pos = XINT (position);
  if (pos < BEGV || pos >= ZV)
    args_out_of_range_3 (position, make_number (BEGV), make_number (ZV));
  pos_byte = CHAR_TO_BYTE (pos);
  c = FETCH_CHAR (pos_byte);
  if (! CHAR_VALID_P (c, 0))
    return Qnil;
  window = Fget_buffer_window (Fcurrent_buffer (), Qt);
  if (NILP (window))
    return Qnil;
  w = XWINDOW (window);
  f = XFRAME (w->frame);
  face_id = face_at_buffer_position (w, pos, -1, -1, &dummy, pos + 100, 0);
  face_id = FACE_FOR_CHAR (f, FACE_FROM_ID (f, face_id), c);
  face = FACE_FROM_ID (f, face_id);
  return (face->font && face->font_name
	  ? build_string (face->font_name)
	  : Qnil);
}


/* Called from Ffontset_info via map_char_table on each leaf of
   fontset.  ARG is a list (LAST FONT-INFO ...), where LAST is `(last
   ARG)' and FONT-INFOs have this form:
	(CHAR FONT-SPEC) or ((FROM . TO) FONT-SPEC)
   The current leaf is indexed by CHARACTER and has value ELT.  This
   function add the information of the current leaf to ARG by
   appending a new element or modifying the last element..  */

static void
accumulate_font_info (arg, character, elt)
     Lisp_Object arg, character, elt;
{
  Lisp_Object last, last_char, last_elt, tmp;

  if (!CONSP (elt) && !SINGLE_BYTE_CHAR_P (XINT (character)))
    elt = FONTSET_REF (Vdefault_fontset, XINT (character));
  if (!CONSP (elt))
    return;
  last = XCAR (arg);
  last_char = XCAR (XCAR (last));
  last_elt = XCAR (XCDR (XCAR (last)));
  elt = XCDR (elt);
  if (!NILP (Fequal (elt, last_elt)))
    {
      int this_charset = CHAR_CHARSET (XINT (character));

      if (CONSP (last_char))	/* LAST_CHAR == (FROM . TO)  */
	{
	  if (this_charset == CHAR_CHARSET (XINT (XCAR (last_char))))
	    {
	      XCDR (last_char) = character;
	      return;
	    }
	}
      else if (XINT (last_char) == XINT (character))
	return;
      else if (this_charset == CHAR_CHARSET (XINT (last_char)))
	{
	  XCAR (XCAR (last)) = Fcons (last_char, character);
	  return;
	}
    }
  XCDR (last) = Fcons (Fcons (character, Fcons (elt, Qnil)), Qnil);
  XCAR (arg) = XCDR (last);
}


DEFUN ("fontset-info", Ffontset_info, Sfontset_info, 1, 2, 0,
  "Return information about a fontset named NAME on frame FRAME.\n\
The value is a list:\n\
  \(FONTSET-NAME (CHARSET-OR-RANGE FONT-SPEC OPENED ...) ...),\n\
where,\n\
  FONTSET-NAME is a full name of the fontset.\n\
  CHARSET-OR-RANGE is a charset, a character (may be a generic character)\n\
    or a cons of two characters specifying the range of characters.\n\
  FONT-SPEC is a fontname pattern string or a cons (FAMILY . REGISTRY),\n\
    where FAMILY is a `FAMILY' field of a XLFD font name,\n\
    REGISTRY is a `CHARSET_REGISTRY' field of a XLDF font name.\n\
    FAMILY may contain a `FOUNDARY' field at the head.\n\
    REGISTRY may contain a `CHARSET_ENCODING' field at the tail.\n\
  OPENEDs are names of fonts actually opened.\n\
If FRAME is omitted, it defaults to the currently selected frame.")
  (name, frame)
     Lisp_Object name, frame;
{
  Lisp_Object fontset;
  FRAME_PTR f;
  Lisp_Object indices[3];
  Lisp_Object val, tail, elt;
  Lisp_Object *realized;
  int n_realized = 0;
  int i;
  
  (*check_window_system_func) ();

  fontset = check_fontset_name (name);

  if (NILP (frame))
    frame = selected_frame;
  CHECK_LIVE_FRAME (frame, 1);
  f = XFRAME (frame);

  /* Recode realized fontsets whose base is FONTSET in the table
     `realized'.  */
  realized = (Lisp_Object *) alloca (sizeof (Lisp_Object)
				     * ASIZE (Vfontset_table));
  for (i = 0; i < ASIZE (Vfontset_table); i++)
    {
      elt = FONTSET_FROM_ID (i);
      if (!NILP (elt)
	  && EQ (FONTSET_BASE (elt), fontset))
	realized[n_realized++] = elt;
    }

  /* Accumulate information of the fontset in VAL.  The format is
     (LAST FONT-INFO FONT-INFO ...), where FONT-INFO is (CHAR-OR-RANGE
     FONT-SPEC).  See the comment for accumulate_font_info for the
     detail.  */
  val = Fcons (Fcons (make_number (0),
		      Fcons (XCDR (FONTSET_ASCII (fontset)), Qnil)),
	       Qnil);
  val = Fcons (val, val);
  map_char_table (accumulate_font_info, Qnil, fontset, val, 0, indices);
  val = XCDR (val);

  /* For each FONT-INFO, if CHAR_OR_RANGE (car part) is a generic
     character for a charset, replace it with the charset symbol.  If
     fonts are opened for FONT-SPEC, append the names of the fonts to
     FONT-SPEC.  */
  for (tail = val; CONSP (tail); tail = XCDR (tail))
    {
      int c;
      elt = XCAR (tail);
      if (INTEGERP (XCAR (elt)))
	{
	  int charset, c1, c2;
	  c = XINT (XCAR (elt));
	  SPLIT_CHAR (c, charset, c1, c2);
	  if (c1 == 0)
	    XCAR (elt) = CHARSET_SYMBOL (charset);
	}
      else
	c = XINT (XCAR (XCAR (elt)));
      for (i = 0; i < n_realized; i++)
	{
	  Lisp_Object face_id, font;
	  struct face *face;

	  face_id = FONTSET_REF_VIA_BASE (realized[i], c);
	  if (INTEGERP (face_id))
	    {
	      face = FACE_FROM_ID (f, XINT (face_id));
	      if (face->font && face->font_name)
		{
		  font = build_string (face->font_name);
		  if (NILP (Fmember (font, XCDR (XCDR (elt)))))
		    XCDR (XCDR (elt)) = Fcons (font, XCDR (XCDR (elt)));
		}
	    }
	}
    }
  return Fcons (FONTSET_NAME (fontset), val);
}

DEFUN ("fontset-font", Ffontset_font, Sfontset_font, 2, 2, 0,
  "Return a font name pattern for character CH in fontset NAME.\n\
If NAME is t, find a font name pattern in the default fontset.")
  (name, ch)
     Lisp_Object name, ch;
{
  int c, id;
  Lisp_Object fontset, elt;

  fontset = check_fontset_name (name);

  CHECK_NUMBER (ch, 1);
  c = XINT (ch);
  if (!char_valid_p (c, 1))
    invalid_character (c);

  elt = FONTSET_REF (fontset, c);
  if (CONSP (elt))
    elt = XCDR (elt);

  return elt;
}
  

DEFUN ("fontset-list", Ffontset_list, Sfontset_list, 0, 0, 0,
  "Return a list of all defined fontset names.")
  ()
{
  Lisp_Object fontset, list;
  int i;

  list = Qnil;
  for (i = 0; i < ASIZE (Vfontset_table); i++)
    {
      fontset = FONTSET_FROM_ID (i);
      if (!NILP (fontset)
	  && BASE_FONTSET_P (fontset))
	list = Fcons (FONTSET_NAME (fontset), list);
    }

  return list;
}

void
syms_of_fontset ()
{
  int i;

  if (!load_font_func)
    /* Window system initializer should have set proper functions.  */
    abort ();

  Qfontset = intern ("fontset");
  staticpro (&Qfontset);
  Fput (Qfontset, Qchar_table_extra_slots, make_number (3));

  Vcached_fontset_data = Qnil;
  staticpro (&Vcached_fontset_data);

  Vfontset_table = Fmake_vector (make_number (32), Qnil);
  staticpro (&Vfontset_table);

  Vdefault_fontset = Fmake_char_table (Qfontset, Qnil);
  staticpro (&Vdefault_fontset);
  FONTSET_ID (Vdefault_fontset) = make_number (0);
  FONTSET_NAME (Vdefault_fontset)
    = build_string ("-*-*-*-*-*-*-*-*-*-*-*-*-fontset-default");
  FONTSET_ASCII (Vdefault_fontset)
    = Fcons (make_number (0),
	     build_string ("-adobe-courier-medium-r-*-*-*-120-*-*-*-*-iso8859-1"));
  AREF (Vfontset_table, 0) = Vdefault_fontset;
  next_fontset_id = 1;

  DEFVAR_LISP ("font-encoding-alist", &Vfont_encoding_alist,
    "Alist of fontname patterns vs corresponding encoding info.\n\
Each element looks like (REGEXP . ENCODING-INFO),\n\
 where ENCODING-INFO is an alist of CHARSET vs ENCODING.\n\
ENCODING is one of the following integer values:\n\
	0: code points 0x20..0x7F or 0x2020..0x7F7F are used,\n\
	1: code points 0xA0..0xFF or 0xA0A0..0xFFFF are used,\n\
	2: code points 0x20A0..0x7FFF are used,\n\
	3: code points 0xA020..0xFF7F are used.");
  Vfont_encoding_alist = Qnil;

  DEFVAR_LISP ("use-default-ascent", &Vuse_default_ascent,
     "Char table of characters whose ascent values should be ignored.\n\
If an entry for a character is non-nil, the ascent value of the glyph\n\
is assumed to be what specified by _MULE_DEFAULT_ASCENT property of a font.\n\
\n\
This affects how a composite character which contains\n\
such a character is displayed on screen.");
  Vuse_default_ascent = Qnil;

  DEFVAR_LISP ("ignore-relative-composition", &Vignore_relative_composition,
     "Char table of characters which is not composed relatively.\n\
If an entry for a character is non-nil, a composition sequence\n\
which contains that character is displayed so that\n\
the glyph of that character is put without considering\n\
an ascent and descent value of a previous character.");
  Vignore_relative_composition = Qnil;

  DEFVAR_LISP ("alternate-fontname-alist", &Valternate_fontname_alist,
     "Alist of fontname vs list of the alternate fontnames.\n\
When a specified font name is not found, the corresponding\n\
alternate fontnames (if any) are tried instead.");
  Valternate_fontname_alist = Qnil;

  DEFVAR_LISP ("fontset-alias-alist", &Vfontset_alias_alist,
     "Alist of fontset names vs the aliases.");
  Vfontset_alias_alist = Fcons (Fcons (FONTSET_NAME (Vdefault_fontset),
				       build_string ("fontset-default")),
				Qnil);

  DEFVAR_LISP ("highlight-wrong-size-font", &Vhighlight_wrong_size_font,
     "*Non-nil means highlight characters shown in wrong size fonts somehow.\n\
The way to highlight them depends on window system on which Emacs runs.\n\
On X11, a rectangle is shown around each such character.");
  Vhighlight_wrong_size_font = Qnil;

  DEFVAR_LISP ("clip-large-size-font", &Vclip_large_size_font,
     "*Non-nil means characters shown in overlarge fonts are clipped.\n\
The height of clipping area is the same as that of an ASCII character.\n\
The width of the area is the same as that of an ASCII character,\n\
or twice as wide, depending on the character set's column-width.\n\
\n\
If the only font you have for a specific character set is too large,\n\
and clipping these characters makes them hard to read,\n\
you can set this variable to nil to display the characters without clipping.\n\
The drawback is that you will get some garbage left on your screen.");
  Vclip_large_size_font = Qt;

  DEFVAR_LISP ("vertical-centering-font-regexp",
	       &Vvertical_centering_font_regexp,
    "*Regexp matching font names that require vertical centering on display.\n\
When a character is displayed with such fonts, the character is displayed\n\
at the vertival center of lines.");
  Vvertical_centering_font_regexp = Qnil;

  defsubr (&Squery_fontset);
  defsubr (&Snew_fontset);
  defsubr (&Sset_fontset_font);
  defsubr (&Sfont_info);
  defsubr (&Sinternal_char_font);
  defsubr (&Sfontset_info);
  defsubr (&Sfontset_font);
  defsubr (&Sfontset_list);
}