summaryrefslogtreecommitdiff
path: root/vcl/source/gdi/sallayout.cxx
blob: 7cc160ac48b5253f25e99d880e78dc13a6938506 (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
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org 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 Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/


#include <cstdio>

#define _USE_MATH_DEFINES
#include <math.h>
#include <sal/alloca.h>

#include <salgdi.hxx>
#include <sallayout.hxx>
#include <basegfx/polygon/b2dpolypolygon.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>

#include <i18npool/lang.h>

#include <tools/debug.hxx>

#include <limits.h>

#if defined _MSC_VER
#pragma warning(push, 1)
#endif
#include <unicode/ubidi.h>
#include <unicode/uchar.h>
#if defined _MSC_VER
#pragma warning(pop)
#endif

#include <algorithm>

#ifdef DEBUG
//#define MULTI_SL_DEBUG
#endif

#ifdef MULTI_SL_DEBUG
#include <string>
FILE * mslLogFile = NULL;
FILE * mslLog()
{
#ifdef MSC
    std::string logFileName(getenv("TEMP"));
    logFileName.append("\\msllayout.log");
    if (mslLogFile == NULL) mslLogFile = fopen(logFileName.c_str(),"w");
    else fflush(mslLogFile);
    return mslLogFile;
#else
    return stdout;
#endif
}
#endif
// =======================================================================

// TODO: ask the glyph directly, for now we need this method because of #i99367#
// true if a codepoint doesn't influence the logical text width
bool IsDiacritic( sal_UCS4 nChar )
{
    // shortcut abvious non-diacritics
    if( nChar < 0x0300 )
        return false;
     if( nChar >= 0x2100 )
        return false;

    // TODO: #i105058# use icu uchar.h's character classification instead of the handcrafted table
    struct DiaRange { sal_UCS4 mnMin, mnEnd;};
    static const DiaRange aRanges[] = {
        {0x0300, 0x0370},
        {0x0590, 0x05BE}, {0x05BF, 0x05C0}, {0x05C1, 0x05C3}, {0x05C4, 0x05C6}, {0x05C7, 0x05C8},
        {0x0610, 0x061B}, {0x064B, 0x0660}, {0x0670, 0x0671}, {0x06D6, 0x06DD}, {0x06DF, 0x06E5}, {0x06E7, 0x06E9}, {0x06EA,0x06EF},
        {0x0730, 0x074D}, {0x07A6, 0x07B1}, {0x07EB, 0x07F4},
        {0x1DC0, 0x1E00},
        {0x205F, 0x2070}, {0x20D0, 0x2100},
        {0xFB1E, 0xFB1F}
    };

    // TODO: almost anything is faster than an O(n) search
    static const int nCount = SAL_N_ELEMENTS(aRanges);
    const DiaRange* pRange = &aRanges[0];
    for( int i = nCount; --i >= 0; ++pRange )
        if( (pRange->mnMin <= nChar) && (nChar < pRange->mnEnd) )
            return true;

    return false;
}

// =======================================================================

int GetVerticalFlags( sal_UCS4 nChar )
{
    if( (nChar >= 0x1100 && nChar <= 0x11f9)    // Hangul Jamo
     || (nChar == 0x2030 || nChar == 0x2031)    // per mille sign
     || (nChar >= 0x3000 && nChar <= 0xfaff)    // unified CJK
     || (nChar >= 0xfe20 && nChar <= 0xfe6f)    // CJK compatibility
     || (nChar >= 0xff00 && nChar <= 0xfffd) )  // other CJK
    {
        /* #i52932# remember:
         nChar == 0x2010 || nChar == 0x2015
         nChar == 0x2016 || nChar == 0x2026
         are GF_NONE also, but already handled in the outer if condition
        */
        if((nChar >= 0x3008 && nChar <= 0x301C && nChar != 0x3012)
        || (nChar == 0xFF3B || nChar == 0xFF3D)
        || (nChar >= 0xFF5B && nChar <= 0xFF9F) // halfwidth forms
        || (nChar == 0xFFE3) )
            return GF_NONE; // not rotated
        else if( nChar == 0x30fc )
            return GF_ROTR; // right
        return GF_ROTL;     // left
    }
    else if( (nChar >= 0x20000) && (nChar <= 0x3FFFF) ) // all SIP/TIP ideographs
        return GF_ROTL; // left

    return GF_NONE; // not rotated as default
}

// -----------------------------------------------------------------------

sal_UCS4 GetVerticalChar( sal_UCS4 )
{
    return 0; // #i14788# input method is responsible vertical char changes
}

// -----------------------------------------------------------------------

VCL_DLLPUBLIC sal_UCS4 GetMirroredChar( sal_UCS4 nChar )
{
    nChar = u_charMirror( nChar );
    return nChar;
}

// -----------------------------------------------------------------------

sal_UCS4 GetLocalizedChar( sal_UCS4 nChar, LanguageType eLang )
{
    // currently only conversion from ASCII digits is interesting
    if( (nChar < '0') || ('9' < nChar) )
        return nChar;

    int nOffset;
    // eLang & LANGUAGE_MASK_PRIMARY catches language independent of region.
    // CAVEAT! To some like Mongolian MS assigned the same primary language
    // although the script type is different!
    switch( eLang & LANGUAGE_MASK_PRIMARY )
    {
        default:
            nOffset = 0;
            break;
        case LANGUAGE_ARABIC_SAUDI_ARABIA  & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0660 - '0';  // arabic-indic digits
            break;
        case LANGUAGE_FARSI         & LANGUAGE_MASK_PRIMARY:
        case LANGUAGE_URDU          & LANGUAGE_MASK_PRIMARY:
        case LANGUAGE_PUNJABI       & LANGUAGE_MASK_PRIMARY: //???
        case LANGUAGE_SINDHI        & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x06F0 - '0';  // eastern arabic-indic digits
            break;
        case LANGUAGE_BENGALI       & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x09E6 - '0';  // bengali
            break;
        case LANGUAGE_HINDI         & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0966 - '0';  // devanagari
            break;
        case LANGUAGE_AMHARIC_ETHIOPIA & LANGUAGE_MASK_PRIMARY:
        case LANGUAGE_TIGRIGNA_ETHIOPIA & LANGUAGE_MASK_PRIMARY:
        // TODO case:
            nOffset = 0x1369 - '0';  // ethiopic
            break;
        case LANGUAGE_GUJARATI      & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0AE6 - '0';  // gujarati
            break;
#ifdef LANGUAGE_GURMUKHI // TODO case:
        case LANGUAGE_GURMUKHI      & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0A66 - '0';  // gurmukhi
            break;
#endif
        case LANGUAGE_KANNADA       & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0CE6 - '0';  // kannada
            break;
        case LANGUAGE_KHMER         & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x17E0 - '0';  // khmer
            break;
        case LANGUAGE_LAO           & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0ED0 - '0';  // lao
            break;
        case LANGUAGE_MALAYALAM     & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0D66 - '0';  // malayalam
            break;
        case LANGUAGE_MONGOLIAN     & LANGUAGE_MASK_PRIMARY:
            if (eLang == LANGUAGE_MONGOLIAN_MONGOLIAN)
                nOffset = 0x1810 - '0';   // mongolian
            else
                nOffset = 0;              // mongolian cyrillic
            break;
        case LANGUAGE_BURMESE       & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x1040 - '0';  // myanmar
            break;
        case LANGUAGE_ORIYA         & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0B66 - '0';  // oriya
            break;
        case LANGUAGE_TAMIL         & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0BE7 - '0';  // tamil
            break;
        case LANGUAGE_TELUGU        & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0C66 - '0';  // telugu
            break;
        case LANGUAGE_THAI          & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0E50 - '0';  // thai
            break;
        case LANGUAGE_TIBETAN       & LANGUAGE_MASK_PRIMARY:
            nOffset = 0x0F20 - '0';  // tibetan
            break;
    }

    nChar += nOffset;
    return nChar;
}

// -----------------------------------------------------------------------

inline bool IsControlChar( sal_UCS4 cChar )
{
    // C0 control characters
    if( (0x0001 <= cChar) && (cChar <= 0x001F) )
        return true;
    // formatting characters
    if( (0x200E <= cChar) && (cChar <= 0x200F) )
        return true;
    if( (0x2028 <= cChar) && (cChar <= 0x202E) )
        return true;
    // deprecated formatting characters
    if( (0x206A <= cChar) && (cChar <= 0x206F) )
        return true;
    if( (0x2060 == cChar) )
        return true;
    // byte order markers and invalid unicode
    if( (cChar == 0xFEFF) || (cChar == 0xFFFE) || (cChar == 0xFFFF) )
        return true;
    return false;
}

// =======================================================================

bool ImplLayoutRuns::AddPos( int nCharPos, bool bRTL )
{
    // check if charpos could extend current run
    int nIndex = maRuns.size();
    if( nIndex >= 2 )
    {
        int nRunPos0 = maRuns[ nIndex-2 ];
        int nRunPos1 = maRuns[ nIndex-1 ];
        if( ((nCharPos + bRTL) == nRunPos1)
    &&  ((nRunPos0 > nRunPos1) == bRTL) )
        {
            // extend current run by new charpos
            maRuns[ nIndex-1 ] = nCharPos + !bRTL;
            return false;
        }
        // ignore new charpos when it is in current run
        if( (nRunPos0 <= nCharPos) && (nCharPos < nRunPos1) )
            return false;
        if( (nRunPos1 <= nCharPos) && (nCharPos < nRunPos0) )
            return false;
    }

    // else append a new run consisting of the new charpos
    maRuns.push_back( nCharPos + (bRTL ? 1 : 0) );
    maRuns.push_back( nCharPos + (bRTL ? 0 : 1) );
    return true;
}

// -----------------------------------------------------------------------

bool ImplLayoutRuns::AddRun( int nCharPos0, int nCharPos1, bool bRTL )
{
    if( nCharPos0 == nCharPos1 )
        return false;

    // swap if needed
    if( bRTL == (nCharPos0 < nCharPos1) )
    {
        int nTemp = nCharPos0;
        nCharPos0 = nCharPos1;
        nCharPos1 = nTemp;
    }

    // append new run
    maRuns.push_back( nCharPos0 );
    maRuns.push_back( nCharPos1 );
    return true;
}

// -----------------------------------------------------------------------

bool ImplLayoutRuns::PosIsInRun( int nCharPos ) const
{
    if( mnRunIndex >= (int)maRuns.size() )
        return false;

    int nMinCharPos = maRuns[ mnRunIndex+0 ];
    int nEndCharPos = maRuns[ mnRunIndex+1 ];
    if( nMinCharPos > nEndCharPos ) // reversed in RTL case
    {
        int nTemp = nMinCharPos;
        nMinCharPos = nEndCharPos;
        nEndCharPos = nTemp;
    }

    if( nCharPos < nMinCharPos )
        return false;
    if( nCharPos >= nEndCharPos )
        return false;
    return true;
}

bool ImplLayoutRuns::PosIsInAnyRun( int nCharPos ) const
{
    bool bRet = false;
    int nRunIndex = mnRunIndex;

    ImplLayoutRuns *pThis = const_cast<ImplLayoutRuns*>(this);

    pThis->ResetPos();

    for (size_t i = 0; i < maRuns.size(); i+=2)
    {
        if( (bRet = PosIsInRun( nCharPos )) == true )
            break;
        pThis->NextRun();
    }

    pThis->mnRunIndex = nRunIndex;
    return bRet;
}


// -----------------------------------------------------------------------

bool ImplLayoutRuns::GetNextPos( int* nCharPos, bool* bRightToLeft )
{
    // negative nCharPos => reset to first run
    if( *nCharPos < 0 )
        mnRunIndex = 0;

    // return false when all runs completed
    if( mnRunIndex >= (int)maRuns.size() )
        return false;

    int nRunPos0 = maRuns[ mnRunIndex+0 ];
    int nRunPos1 = maRuns[ mnRunIndex+1 ];
    *bRightToLeft = (nRunPos0 > nRunPos1);

    if( *nCharPos < 0 )
    {
        // get first valid nCharPos in run
        *nCharPos = nRunPos0;
    }
    else
    {
        // advance to next nCharPos for LTR case
        if( !*bRightToLeft )
            ++(*nCharPos);

        // advance to next run if current run is completed
        if( *nCharPos == nRunPos1 )
        {
            if( (mnRunIndex += 2) >= (int)maRuns.size() )
                return false;
            nRunPos0 = maRuns[ mnRunIndex+0 ];
            nRunPos1 = maRuns[ mnRunIndex+1 ];
            *bRightToLeft = (nRunPos0 > nRunPos1);
            *nCharPos = nRunPos0;
        }
    }

    // advance to next nCharPos for RTL case
    if( *bRightToLeft )
        --(*nCharPos);

    return true;
}

// -----------------------------------------------------------------------

bool ImplLayoutRuns::GetRun( int* nMinRunPos, int* nEndRunPos, bool* bRightToLeft ) const
{
    if( mnRunIndex >= (int)maRuns.size() )
        return false;

    int nRunPos0 = maRuns[ mnRunIndex+0 ];
    int nRunPos1 = maRuns[ mnRunIndex+1 ];
    *bRightToLeft = (nRunPos1 < nRunPos0) ;
    if( !*bRightToLeft )
    {
        *nMinRunPos = nRunPos0;
        *nEndRunPos = nRunPos1;
    }
    else
    {
        *nMinRunPos = nRunPos1;
        *nEndRunPos = nRunPos0;
    }
    return true;
}

// =======================================================================

ImplLayoutArgs::ImplLayoutArgs( const xub_Unicode* pStr, int nLen,
    int nMinCharPos, int nEndCharPos, int nFlags )
:
    mnFlags( nFlags ),
    mnLength( nLen ),
    mnMinCharPos( nMinCharPos ),
    mnEndCharPos( nEndCharPos ),
    mpStr( pStr ),
    mpDXArray( NULL ),
    mnLayoutWidth( 0 ),
    mnOrientation( 0 )
{
    if( mnFlags & SAL_LAYOUT_BIDI_STRONG )
    {
        // handle strong BiDi mode

        // do not bother to BiDi analyze strong LTR/RTL
        // TODO: can we assume these strings do not have unicode control chars?
        //       if not remove the control characters from the runs
        bool bRTL = ((mnFlags & SAL_LAYOUT_BIDI_RTL) != 0);
        AddRun( mnMinCharPos, mnEndCharPos, bRTL );
    }
    else
    {
        // handle weak BiDi mode

        UBiDiLevel nLevel = UBIDI_DEFAULT_LTR;
        if( mnFlags & SAL_LAYOUT_BIDI_RTL )
            nLevel = UBIDI_DEFAULT_RTL;

        // prepare substring for BiDi analysis
        // TODO: reuse allocated pParaBidi
        UErrorCode rcI18n = U_ZERO_ERROR;
        UBiDi* pParaBidi = ubidi_openSized( mnLength, 0, &rcI18n );
        if( !pParaBidi )
            return;
        ubidi_setPara( pParaBidi, reinterpret_cast<const UChar *>(mpStr), mnLength, nLevel, NULL, &rcI18n );    // UChar != sal_Unicode in MinGW

        UBiDi* pLineBidi = pParaBidi;
        int nSubLength = mnEndCharPos - mnMinCharPos;
        if( nSubLength != mnLength )
        {
            pLineBidi = ubidi_openSized( nSubLength, 0, &rcI18n );
            ubidi_setLine( pParaBidi, mnMinCharPos, mnEndCharPos, pLineBidi, &rcI18n );
        }

        // run BiDi algorithm
        const int nRunCount = ubidi_countRuns( pLineBidi, &rcI18n );
        //maRuns.resize( 2 * nRunCount );
        for( int i = 0; i < nRunCount; ++i )
        {
            int32_t nMinPos, nLength;
            const UBiDiDirection nDir = ubidi_getVisualRun( pLineBidi, i, &nMinPos, &nLength );
            const int nPos0 = nMinPos + mnMinCharPos;
            const int nPos1 = nPos0 + nLength;

            const bool bRTL = (nDir == UBIDI_RTL);
            AddRun( nPos0, nPos1, bRTL );
        }

        // cleanup BiDi engine
        if( pLineBidi != pParaBidi )
            ubidi_close( pLineBidi );
        ubidi_close( pParaBidi );
    }

    // prepare calls to GetNextPos/GetNextRun
    maRuns.ResetPos();
}

// -----------------------------------------------------------------------

// add a run after splitting it up to get rid of control chars
void ImplLayoutArgs::AddRun( int nCharPos0, int nCharPos1, bool bRTL )
{
    DBG_ASSERT( nCharPos0 <= nCharPos1, "ImplLayoutArgs::AddRun() nCharPos0>=nCharPos1" );

    // remove control characters from runs by splitting them up
    if( !bRTL )
    {
        for( int i = nCharPos0; i < nCharPos1; ++i )
            if( IsControlChar( mpStr[i] ) )
            {
                // add run until control char
                maRuns.AddRun( nCharPos0, i, bRTL );
                nCharPos0 = i + 1;
            }
    }
    else
    {
        for( int i = nCharPos1; --i >= nCharPos0; )
            if( IsControlChar( mpStr[i] ) )
            {
                // add run until control char
                maRuns.AddRun( i+1, nCharPos1, bRTL );
                nCharPos1 = i;
            }
    }

    // add remainder of run
    maRuns.AddRun( nCharPos0, nCharPos1, bRTL );
}

// -----------------------------------------------------------------------

bool ImplLayoutArgs::PrepareFallback()
{
    // short circuit if no fallback is needed
    if( maReruns.IsEmpty() )
    {
        maRuns.Clear();
        return false;
    }

    // convert the fallback requests to layout requests
    bool bRTL;
    int nMin, nEnd;

    // get the individual fallback requests
    typedef std::vector<int> IntVector;
    IntVector aPosVector;
    aPosVector.reserve( mnLength );
    maReruns.ResetPos();
    for(; maReruns.GetRun( &nMin, &nEnd, &bRTL ); maReruns.NextRun() )
        for( int i = nMin; i < nEnd; ++i )
            aPosVector.push_back( i );
    maReruns.Clear();

    // sort the individual fallback requests
    std::sort( aPosVector.begin(), aPosVector.end() );

    // adjust fallback runs to have the same order and limits of the original runs
    ImplLayoutRuns aNewRuns;
    maRuns.ResetPos();
    for(; maRuns.GetRun( &nMin, &nEnd, &bRTL ); maRuns.NextRun() )
    {
        if( !bRTL) {
            IntVector::const_iterator it = std::lower_bound( aPosVector.begin(), aPosVector.end(), nMin );
            for(; (it != aPosVector.end()) && (*it < nEnd); ++it )
                aNewRuns.AddPos( *it, bRTL );
        } else {
            IntVector::const_iterator it = std::upper_bound( aPosVector.begin(), aPosVector.end(), nEnd );
            while( (it != aPosVector.begin()) && (*--it >= nMin) )
                aNewRuns.AddPos( *it, bRTL );
        }
    }

    maRuns = aNewRuns;  // TODO: use vector<>::swap()
    maRuns.ResetPos();
    return true;
}

// -----------------------------------------------------------------------

bool ImplLayoutArgs::GetNextRun( int* nMinRunPos, int* nEndRunPos, bool* bRTL )
{
    bool bValid = maRuns.GetRun( nMinRunPos, nEndRunPos, bRTL );
    maRuns.NextRun();
    return bValid;
}

// =======================================================================

SalLayout::SalLayout()
:   mnMinCharPos( -1 ),
    mnEndCharPos( -1 ),
    mnLayoutFlags( 0 ),
    mnUnitsPerPixel( 1 ),
    mnOrientation( 0 ),
    mnRefCount( 1 ),
    maDrawOffset( 0, 0 )
{}

// -----------------------------------------------------------------------

SalLayout::~SalLayout()
{}

// -----------------------------------------------------------------------

void SalLayout::AdjustLayout( ImplLayoutArgs& rArgs )
{
    mnMinCharPos  = rArgs.mnMinCharPos;
    mnEndCharPos  = rArgs.mnEndCharPos;
    mnLayoutFlags = rArgs.mnFlags;
    mnOrientation = rArgs.mnOrientation;
}

// -----------------------------------------------------------------------

void SalLayout::Release() const
{
    // TODO: protect when multiple threads can access this
    if( --mnRefCount > 0 )
        return;
    // const_cast because some compilers violate ANSI C++ spec
    delete const_cast<SalLayout*>(this);
}

// -----------------------------------------------------------------------

Point SalLayout::GetDrawPosition( const Point& rRelative ) const
{
    Point aPos = maDrawBase;
    Point aOfs = rRelative + maDrawOffset;

    if( mnOrientation == 0 )
        aPos += aOfs;
    else
    {
        // cache trigonometric results
        static int nOldOrientation = 0;
        static double fCos = 1.0, fSin = 0.0;
        if( nOldOrientation != mnOrientation )
        {
            nOldOrientation = mnOrientation;
            double fRad = mnOrientation * (M_PI / 1800.0);
            fCos = cos( fRad );
            fSin = sin( fRad );
        }

        double fX = aOfs.X();
        double fY = aOfs.Y();
        long nX = static_cast<long>( +fCos * fX + fSin * fY );
        long nY = static_cast<long>( +fCos * fY - fSin * fX );
        aPos += Point( nX, nY );
    }

    return aPos;
}

// -----------------------------------------------------------------------

// returns asian kerning values in quarter of character width units
// to enable automatic halfwidth substitution for fullwidth punctuation
// return value is negative for l, positive for r, zero for neutral

// If the range doesn't match in 0x3000 and 0x30FB, please change
// also ImplCalcKerning.

int SalLayout::CalcAsianKerning( sal_UCS4 c, bool bLeft, bool /*TODO:? bVertical*/ )
{
    // http://www.asahi-net.or.jp/~sd5a-ucd/freetexts/jis/x4051/1995/appendix.html
    static signed char nTable[0x30] =
    {
         0, -2, -2,  0,   0,  0,  0,  0,  +2, -2, +2, -2,  +2, -2, +2, -2,
        +2, -2,  0,  0,  +2, -2, +2, -2,   0,  0,  0,  0,   0, +2, -2, -2,
         0,  0,  0,  0,   0,  0,  0,  0,   0,  0, -2, -2,  +2, +2, -2, -2
    };

    int nResult = 0;
    if( (c >= 0x3000) && (c < 0x3030) )
        nResult = nTable[ c - 0x3000 ];
    else switch( c )
    {
        case 0x30FB:
            nResult = bLeft ? -1 : +1;      // 25% left/right/top/bottom
            break;
        case 0x2019: case 0x201D:
        case 0xFF01: case 0xFF09: case 0xFF0C:
        case 0xFF1A: case 0xFF1B:
            nResult = -2;
            break;
        case 0x2018: case 0x201C:
        case 0xFF08:
            nResult = +2;
            break;
        default:
            break;
    }

    return nResult;
}

// -----------------------------------------------------------------------

bool SalLayout::GetOutline( SalGraphics& rSalGraphics,
    ::basegfx::B2DPolyPolygonVector& rVector ) const
{
    bool bAllOk = true;
    bool bOneOk = false;

    Point aPos;
    ::basegfx::B2DPolyPolygon aGlyphOutline;
    for( int nStart = 0;;)
    {
        sal_GlyphId nLGlyph;
        if( !GetNextGlyphs( 1, &nLGlyph, aPos, nStart ) )
            break;

        // get outline of individual glyph, ignoring "empty" glyphs
        bool bSuccess = rSalGraphics.GetGlyphOutline( nLGlyph, aGlyphOutline );
        bAllOk &= bSuccess;
        bOneOk |= bSuccess;
        // only add non-empty outlines
        if( bSuccess && (aGlyphOutline.count() > 0) )
        {
            if( aPos.X() || aPos.Y() )
            {
                aGlyphOutline.transform(basegfx::tools::createTranslateB2DHomMatrix(aPos.X(), aPos.Y()));
            }

            // insert outline at correct position
            rVector.push_back( aGlyphOutline );
        }
    }

    return (bAllOk && bOneOk);
}

// -----------------------------------------------------------------------

bool SalLayout::GetBoundRect( SalGraphics& rSalGraphics, Rectangle& rRect ) const
{
    bool bRet = false;
    rRect.SetEmpty();

    Point aPos;
    Rectangle aRectangle;
    for( int nStart = 0;;)
    {
        sal_GlyphId nLGlyph;
        if( !GetNextGlyphs( 1, &nLGlyph, aPos, nStart ) )
            break;

        // get bounding rectangle of individual glyph
        if( rSalGraphics.GetGlyphBoundRect( nLGlyph, aRectangle ) )
        {
            // merge rectangle
            aRectangle += aPos;
            if (rRect.IsEmpty())
                rRect = aRectangle;
            else
                rRect.Union(aRectangle);
            bRet = true;
        }
    }

    return bRet;
}

// -----------------------------------------------------------------------

bool SalLayout::IsSpacingGlyph( sal_GlyphId nGlyph ) const
{
    bool bRet = false;
    if( nGlyph & GF_ISCHAR )
    {
        long nChar = nGlyph & GF_IDXMASK;
        bRet = (nChar <= 0x0020)                    // blank
            //|| (nChar == 0x00A0)                  // non breaking space
            || (nChar >= 0x2000 && nChar <= 0x200F) // whitespace
            || (nChar == 0x3000);                   // ideographic space
    }
    else
        bRet = ((nGlyph & GF_IDXMASK) == 3);
    return bRet;
}

// -----------------------------------------------------------------------

const PhysicalFontFace* SalLayout::GetFallbackFontData( sal_GlyphId /*nGlyphId*/ ) const
{
    return NULL;
}

// =======================================================================

GenericSalLayout::GenericSalLayout()
{}

// -----------------------------------------------------------------------

GenericSalLayout::~GenericSalLayout()
{}

// -----------------------------------------------------------------------

void GenericSalLayout::AppendGlyph( const GlyphItem& rGlyphItem )
{
    m_GlyphItems.push_back(rGlyphItem);
}

// -----------------------------------------------------------------------

bool GenericSalLayout::GetCharWidths( sal_Int32* pCharWidths ) const
{
    // initialize character extents buffer
    int nCharCount = mnEndCharPos - mnMinCharPos;
    for( int n = 0; n < nCharCount; ++n )
        pCharWidths[n] = 0;

    // determine cluster extents
    for( GlyphVector::const_iterator pG = m_GlyphItems.begin(), end = m_GlyphItems.end(); pG != end ; ++pG)
    {
        // use cluster start to get char index
        if( !pG->IsClusterStart() )
            continue;

        int n = pG->mnCharPos;
        if( n >= mnEndCharPos )
            continue;
        n -= mnMinCharPos;
        if( n < 0 )
            continue;

        // left glyph in cluster defines default extent
        long nXPosMin = pG->maLinearPos.X();
        long nXPosMax = nXPosMin + pG->mnNewWidth;

        // calculate right x-position for this glyph cluster
        // break if no more glyphs in layout
        // break at next glyph cluster start
        while( (pG+1 != end) && !pG[1].IsClusterStart() )
        {
            // advance to next glyph in cluster
            ++pG;

            if( pG->IsDiacritic() )
                continue; // ignore diacritics
            // get leftmost x-extent of this glyph
            long nXPos = pG->maLinearPos.X();
            if( nXPosMin > nXPos )
                nXPosMin = nXPos;

            // get rightmost x-extent of this glyph
            nXPos += pG->mnNewWidth;
            if( nXPosMax < nXPos )
                nXPosMax = nXPos;
        }

        // when the current cluster overlaps with the next one assume
        // rightmost cluster edge is the leftmost edge of next cluster
        // for clusters that do not have x-sorted glyphs
        // TODO: avoid recalculation of left bound in next cluster iteration
        for( GlyphVector::const_iterator pN = pG; ++pN != end; )
        {
            if( pN->IsClusterStart() )
                break;
            if( pN->IsDiacritic() )
                continue;   // ignore diacritics
            if( nXPosMax > pN->maLinearPos.X() )
                nXPosMax = pN->maLinearPos.X();
        }
        if( nXPosMax < nXPosMin )
            nXPosMin = nXPosMax = 0;

        // character width is sum of glyph cluster widths
        pCharWidths[n] += nXPosMax - nXPosMin;
    }

    // TODO: distribute the cluster width proportionally to the characters
    // clusters (e.g. ligatures) correspond to more than one char index,
    // so some character widths are still uninitialized. This is solved
    // by setting the first charwidth of the cluster to the cluster width

    return true;
}

// -----------------------------------------------------------------------

long GenericSalLayout::FillDXArray( sal_Int32* pCharWidths ) const
{
    if( pCharWidths )
        if( !GetCharWidths( pCharWidths ) )
            return 0;

    long nWidth = GetTextWidth();
    return nWidth;
}

// -----------------------------------------------------------------------

// the text width is the maximum logical extent of all glyphs
long GenericSalLayout::GetTextWidth() const
{
    if( m_GlyphItems.empty() )
        return 0;

    // initialize the extent
    long nMinPos = 0;
    long nMaxPos = 0;

    for( GlyphVector::const_iterator pG = m_GlyphItems.begin(), end = m_GlyphItems.end(); pG != end ; ++pG )
    {
        // update the text extent with the glyph extent
        long nXPos = pG->maLinearPos.X();
        if( nMinPos > nXPos )
            nMinPos = nXPos;
        nXPos += pG->mnNewWidth;
        if( nMaxPos < nXPos )
            nMaxPos = nXPos;
    }

    long nWidth = nMaxPos - nMinPos;
    return nWidth;
}

// -----------------------------------------------------------------------

void GenericSalLayout::AdjustLayout( ImplLayoutArgs& rArgs )
{
    SalLayout::AdjustLayout( rArgs );

    if( rArgs.mpDXArray )
        ApplyDXArray( rArgs );
    else if( rArgs.mnLayoutWidth )
        Justify( rArgs.mnLayoutWidth );
}

// -----------------------------------------------------------------------

void GenericSalLayout::ApplyDXArray( ImplLayoutArgs& rArgs )
{
    if( m_GlyphItems.empty())
        return;

    // determine cluster boundaries and x base offset
    const int nCharCount = rArgs.mnEndCharPos - rArgs.mnMinCharPos;
    int* pLogCluster = (int*)alloca( nCharCount * sizeof(int) );
    size_t i;
    int n,p;
    long nBasePointX = -1;
    if( mnLayoutFlags & SAL_LAYOUT_FOR_FALLBACK )
        nBasePointX = 0;
    for(p = 0; p < nCharCount; ++p )
        pLogCluster[ p ] = -1;

    for( i = 0; i < m_GlyphItems.size(); ++i)
    {
        n = m_GlyphItems[i].mnCharPos - rArgs.mnMinCharPos;
        if( (n < 0) || (nCharCount <= n) )
            continue;
        if( pLogCluster[ n ] < 0 )
            pLogCluster[ n ] = i;
        if( nBasePointX < 0 )
            nBasePointX = m_GlyphItems[i].maLinearPos.X();
    }
    // retarget unresolved pLogCluster[n] to a glyph inside the cluster
    // TODO: better do it while the deleted-glyph markers are still there
    for( n = 0; n < nCharCount; ++n )
        if( (p = pLogCluster[0]) >= 0 )
            break;
    if( n >= nCharCount )
        return;
    for( n = 0; n < nCharCount; ++n )
    {
        if( pLogCluster[ n ] < 0 )
            pLogCluster[ n ] = p;
        else
            p = pLogCluster[ n ];
    }

    // calculate adjusted cluster widths
    sal_Int32* pNewGlyphWidths = (sal_Int32*)alloca( m_GlyphItems.size() * sizeof(long) );
    for( i = 0; i < m_GlyphItems.size(); ++i )
        pNewGlyphWidths[ i ] = 0;

    bool bRTL;
    for( int nCharPos = p = -1; rArgs.GetNextPos( &nCharPos, &bRTL ); )
    {
        n = nCharPos - rArgs.mnMinCharPos;
        if( (n < 0) || (nCharCount <= n) )  continue;

        if( pLogCluster[ n ] >= 0 )
            p = pLogCluster[ n ];
        if( p >= 0 )
        {
            long nDelta = rArgs.mpDXArray[ n ] ;
            if( n > 0 )
                nDelta -= rArgs.mpDXArray[ n-1 ];
            pNewGlyphWidths[ p ] += nDelta * mnUnitsPerPixel;
        }
    }

    // move cluster positions using the adjusted widths
    long nDelta = 0;
    long nNewPos = 0;
    for( i = 0; i < m_GlyphItems.size(); ++i)
    {
        if( m_GlyphItems[i].IsClusterStart() )
        {
            // calculate original and adjusted cluster width
            int nOldClusterWidth = m_GlyphItems[i].mnNewWidth;
            int nNewClusterWidth = pNewGlyphWidths[i];
            size_t j;
            for( j = i; ++j < m_GlyphItems.size(); )
            {
                if( m_GlyphItems[j].IsClusterStart() )
                    break;
                if( !m_GlyphItems[j].IsDiacritic() ) // #i99367# ignore diacritics
                    nOldClusterWidth += m_GlyphItems[j].mnNewWidth;
                nNewClusterWidth += pNewGlyphWidths[j];
            }
            const int nDiff = nNewClusterWidth - nOldClusterWidth;

            // adjust cluster glyph widths and positions
            nDelta = nBasePointX + (nNewPos - m_GlyphItems[i].maLinearPos.X());
            if( !m_GlyphItems[i].IsRTLGlyph() )
            {
                // for LTR case extend rightmost glyph in cluster
                m_GlyphItems[j - 1].mnNewWidth += nDiff;
            }
            else
            {
                // right align cluster in new space for RTL case
                m_GlyphItems[i].mnNewWidth += nDiff;
                nDelta += nDiff;
            }

            nNewPos += nNewClusterWidth;
        }

        m_GlyphItems[i].maLinearPos.X() += nDelta;
    }
}

// -----------------------------------------------------------------------

void GenericSalLayout::Justify( long nNewWidth )
{
    nNewWidth *= mnUnitsPerPixel;
    int nOldWidth = GetTextWidth();
    if( !nOldWidth || nNewWidth==nOldWidth )
        return;

    if(m_GlyphItems.empty())
    {
        return;
    }
    // find rightmost glyph, it won't get stretched
    GlyphVector::iterator pGRight = m_GlyphItems.begin();
    pGRight += m_GlyphItems.size() - 1;
    GlyphVector::iterator pG;
    // count stretchable glyphs
    int nStretchable = 0;
    int nMaxGlyphWidth = 0;
    for(pG = m_GlyphItems.begin(); pG != pGRight; ++pG)
    {
        if( !pG->IsDiacritic() )
            ++nStretchable;
        if( nMaxGlyphWidth < pG->mnOrigWidth )
            nMaxGlyphWidth = pG->mnOrigWidth;
    }

    // move rightmost glyph to requested position
    nOldWidth -= pGRight->mnOrigWidth;
    if( nOldWidth <= 0 )
        return;
    if( nNewWidth < nMaxGlyphWidth)
        nNewWidth = nMaxGlyphWidth;
    nNewWidth -= pGRight->mnOrigWidth;
    pGRight->maLinearPos.X() = maBasePoint.X() + nNewWidth;

    // justify glyph widths and positions
    int nDiffWidth = nNewWidth - nOldWidth;
    if( nDiffWidth >= 0) // expanded case
    {
        // expand width by distributing space between glyphs evenly
        int nDeltaSum = 0;
        for( pG = m_GlyphItems.begin(); pG != pGRight; ++pG )
        {
            // move glyph to justified position
            pG->maLinearPos.X() += nDeltaSum;

            // do not stretch non-stretchable glyphs
            if( pG->IsDiacritic() || (nStretchable <= 0) )
                continue;

            // distribute extra space equally to stretchable glyphs
            int nDeltaWidth = nDiffWidth / nStretchable--;
            nDiffWidth     -= nDeltaWidth;
            pG->mnNewWidth += nDeltaWidth;
            nDeltaSum      += nDeltaWidth;
        }
    }
    else // condensed case
    {
        // squeeze width by moving glyphs proportionally
        double fSqueeze = (double)nNewWidth / nOldWidth;
        if(m_GlyphItems.size() > 1)
        {
            for( pG = m_GlyphItems.begin(); ++pG != pGRight;)
            {
                int nX = pG->maLinearPos.X() - maBasePoint.X();
                nX = (int)(nX * fSqueeze);
                pG->maLinearPos.X() = nX + maBasePoint.X();
            }
        }
        // adjust glyph widths to new positions
        for( pG = m_GlyphItems.begin(); pG != pGRight; ++pG )
            pG->mnNewWidth = pG[1].maLinearPos.X() - pG[0].maLinearPos.X();
    }
}

// -----------------------------------------------------------------------

void GenericSalLayout::ApplyAsianKerning( const sal_Unicode* pStr, int nLength )
{
    long nOffset = 0;

    for( GlyphVector::iterator pG = m_GlyphItems.begin(), pGEnd = m_GlyphItems.end(); pG != pGEnd; ++pG )
    {
        const int n = pG->mnCharPos;
        if( n < nLength - 1)
        {
            // ignore code ranges that are not affected by asian punctuation compression
            const sal_Unicode cHere = pStr[n];
            if( ((0x3000 != (cHere & 0xFF00)) && (0x2010 != (cHere & 0xFFF0))) || (0xFF00 != (cHere & 0xFF00)) )
                continue;
            const sal_Unicode cNext = pStr[n+1];
            if( ((0x3000 != (cNext & 0xFF00)) && (0x2010 != (cNext & 0xFFF0))) || (0xFF00 != (cNext & 0xFF00)) )
                continue;

            // calculate compression values
            const bool bVertical = false;
            long nKernFirst = +CalcAsianKerning( cHere, true, bVertical );
            long nKernNext  = -CalcAsianKerning( cNext, false, bVertical );

            // apply punctuation compression to logical glyph widths
            long nDelta = (nKernFirst < nKernNext) ? nKernFirst : nKernNext;
            if( nDelta<0 && nKernFirst!=0 && nKernNext!=0 )
            {
                int nGlyphWidth = pG->mnOrigWidth;
                nDelta = (nDelta * nGlyphWidth + 2) / 4;
                if( pG+1 == pGEnd )
                    pG->mnNewWidth += nDelta;
                nOffset += nDelta;
            }
        }

        // adjust the glyph positions to the new glyph widths
        if( pG+1 != pGEnd )
            pG->maLinearPos.X() += nOffset;
    }
}

// -----------------------------------------------------------------------

void GenericSalLayout::KashidaJustify( long nKashidaIndex, int nKashidaWidth )
{
    // TODO: reimplement method when container type for GlyphItems changes

    // skip if the kashida glyph in the font looks suspicious
    if( nKashidaWidth <= 0 )
        return;

    // calculate max number of needed kashidas
    int nKashidaCount = 0;
    for (GlyphVector::iterator pG = m_GlyphItems.begin();
            pG != m_GlyphItems.end(); ++pG)
    {
        // only inject kashidas in RTL contexts
        if( !pG->IsRTLGlyph() )
            continue;
        // no kashida-injection for blank justified expansion either
        if( IsSpacingGlyph( pG->mnGlyphIndex ) )
            continue;

        // calculate gap, ignore if too small
        int nGapWidth = pG->mnNewWidth - pG->mnOrigWidth;
        // worst case is one kashida even for mini-gaps
        if( 3 * nGapWidth < nKashidaWidth )
            continue;

        nKashidaCount = 0;
        Point aPos = pG->maLinearPos;
        aPos.X() -= nGapWidth; // cluster is already right aligned
        int const nCharPos = pG->mnCharPos;
        GlyphVector::iterator pG2 = pG;
        for(; nGapWidth > nKashidaWidth; nGapWidth -= nKashidaWidth, ++nKashidaCount )
        {
            pG2 = m_GlyphItems.insert(pG2, GlyphItem(nCharPos, nKashidaIndex, aPos,
                                                      GlyphItem::IS_IN_CLUSTER|GlyphItem::IS_RTL_GLYPH, nKashidaWidth ));
            ++pG2;
            aPos.X() += nKashidaWidth;
        }

        // fixup rightmost kashida for gap remainder
        if( nGapWidth > 0 )
        {
            pG2 = m_GlyphItems.insert(pG2, GlyphItem(nCharPos, nKashidaIndex, aPos,
                                                      GlyphItem::IS_IN_CLUSTER|GlyphItem::IS_RTL_GLYPH, nKashidaCount ? nGapWidth : nGapWidth/2 ));
            ++pG2;
            aPos.X() += nGapWidth;
        }
        pG = pG2;
    }
}

// -----------------------------------------------------------------------

void GenericSalLayout::GetCaretPositions( int nMaxIndex, sal_Int32* pCaretXArray ) const
{
    // initialize result array
    long nXPos = -1;
    int i;
    for( i = 0; i < nMaxIndex; ++i )
        pCaretXArray[ i ] = nXPos;

    // calculate caret positions using glyph array
    for( GlyphVector::const_iterator pG = m_GlyphItems.begin(), pGEnd = m_GlyphItems.end(); pG != pGEnd; ++pG )
    {
        nXPos = pG->maLinearPos.X();
        long nXRight = nXPos + pG->mnOrigWidth;
        int n = pG->mnCharPos;
        int nCurrIdx = 2 * (n - mnMinCharPos);
        if( !pG->IsRTLGlyph() )
        {
            // normal positions for LTR case
            pCaretXArray[ nCurrIdx ]   = nXPos;
            pCaretXArray[ nCurrIdx+1 ] = nXRight;
        }
        else
        {
            // reverse positions for RTL case
            pCaretXArray[ nCurrIdx ]   = nXRight;
            pCaretXArray[ nCurrIdx+1 ] = nXPos;
        }
    }
}

// -----------------------------------------------------------------------

int GenericSalLayout::GetTextBreak( long nMaxWidth, long nCharExtra, int nFactor ) const
{
    int nCharCapacity = mnEndCharPos - mnMinCharPos;
    sal_Int32* pCharWidths = (sal_Int32*)alloca( nCharCapacity * sizeof(sal_Int32) );
    if( !GetCharWidths( pCharWidths ) )
        return STRING_LEN;

    long nWidth = 0;
    for( int i = mnMinCharPos; i < mnEndCharPos; ++i )
    {
        nWidth += pCharWidths[ i - mnMinCharPos ] * nFactor;
        if( nWidth > nMaxWidth )
            return i;
        nWidth += nCharExtra;
    }

    return STRING_LEN;
}

// -----------------------------------------------------------------------

int GenericSalLayout::GetNextGlyphs( int nLen, sal_GlyphId* pGlyphs, Point& rPos,
    int& nStart, sal_Int32* pGlyphAdvAry, int* pCharPosAry ) const
{
    GlyphVector::const_iterator pG = m_GlyphItems.begin();
    GlyphVector::const_iterator pGEnd = m_GlyphItems.end();
    pG += nStart;

    // find next glyph in substring
    for(; pG != pGEnd; ++nStart, ++pG )
    {
        int n = pG->mnCharPos;
        if( (mnMinCharPos <= n) && (n < mnEndCharPos) )
            break;
    }

    // return zero if no more glyph found
    if( nStart >= (int)m_GlyphItems.size() )
        return 0;

    // calculate absolute position in pixel units
    Point aRelativePos = pG->maLinearPos - maBasePoint;

    // find more glyphs which can be merged into one drawing instruction
    int nCount = 0;
    long nYPos = pG->maLinearPos.Y();
    long nOldFlags = pG->mnGlyphIndex;
    for(;;)
    {
        // update return data with glyph info
        ++nCount;
        *(pGlyphs++) = pG->mnGlyphIndex;
        if( pCharPosAry )
            *(pCharPosAry++) = pG->mnCharPos;
        if( pGlyphAdvAry )
            *pGlyphAdvAry = pG->mnNewWidth;

        // break at end of glyph list
        if( ++nStart >= (int)m_GlyphItems.size() )
            break;
        // break when enough glyphs
        if( nCount >= nLen )
            break;

        long nGlyphAdvance = pG[1].maLinearPos.X() - pG->maLinearPos.X();
        if( pGlyphAdvAry )
        {
            // override default advance width with correct value
            *(pGlyphAdvAry++) = nGlyphAdvance;
        }
        else
        {
            // stop when next x-position is unexpected
            if( pG->mnOrigWidth != nGlyphAdvance )
                break;
        }

        // advance to next glyph
        ++pG;

        // stop when next y-position is unexpected
        if( nYPos != pG->maLinearPos.Y() )
            break;

        // stop when no longer in string
        int n = pG->mnCharPos;
        if( (n < mnMinCharPos) || (mnEndCharPos <= n) )
            break;

        // stop when glyph flags change
        if( (nOldFlags ^ pG->mnGlyphIndex) & GF_FLAGMASK )
            break;

        nOldFlags = pG->mnGlyphIndex; // &GF_FLAGMASK not needed for test above
    }

    aRelativePos.X() /= mnUnitsPerPixel;
    aRelativePos.Y() /= mnUnitsPerPixel;
    rPos = GetDrawPosition( aRelativePos );

    return nCount;
}

// -----------------------------------------------------------------------

void GenericSalLayout::MoveGlyph( int nStart, long nNewXPos )
{
    if( nStart >= (int)m_GlyphItems.size() )
        return;

    GlyphVector::iterator pG = m_GlyphItems.begin();
    pG += nStart;

    // the nNewXPos argument determines the new cell position
    // as RTL-glyphs are right justified in their cell
    // the cell position needs to be adjusted to the glyph position
    if( pG->IsRTLGlyph() )
        nNewXPos += pG->mnNewWidth - pG->mnOrigWidth;
    // calculate the x-offset to the old position
    long nXDelta = nNewXPos - pG->maLinearPos.X();
    // adjust all following glyph positions if needed
    if( nXDelta != 0 )
    {
        for( GlyphVector::iterator pGEnd = m_GlyphItems.end(); pG != pGEnd; ++pG )
        {
            pG->maLinearPos.X() += nXDelta;
        }
    }
}

// -----------------------------------------------------------------------

void GenericSalLayout::DropGlyph( int nStart )
{
    if( nStart >= (int)m_GlyphItems.size())
        return;

    GlyphVector::iterator pG = m_GlyphItems.begin();
    pG += nStart;
    pG->mnGlyphIndex = GF_DROPPED;
    pG->mnCharPos = -1;
}

// -----------------------------------------------------------------------

void GenericSalLayout::Simplify( bool bIsBase )
{
    const sal_GlyphId nDropMarker = bIsBase ? GF_DROPPED : 0;

    // remove dropped glyphs inplace
    size_t j = 0;
    for(size_t i = 0; i < m_GlyphItems.size(); i++ )
    {
        if( m_GlyphItems[i].mnGlyphIndex == nDropMarker )
            continue;

        if( i != j )
        {
            m_GlyphItems[j] = m_GlyphItems[i];
        }
        j += 1;
    }
    m_GlyphItems.erase(m_GlyphItems.begin() + j, m_GlyphItems.end());
}

// -----------------------------------------------------------------------

// make sure GlyphItems are sorted left to right
void GenericSalLayout::SortGlyphItems()
{
    // move cluster components behind their cluster start (especially for RTL)
    // using insertion sort because the glyph items are "almost sorted"

    for( GlyphVector::iterator pG = m_GlyphItems.begin(), pGEnd = m_GlyphItems.end(); pG != pGEnd; ++pG )
    {
        // find a cluster starting with a diacritic
        if( !pG->IsDiacritic() )
            continue;
        if( !pG->IsClusterStart() )
            continue;
        for( GlyphVector::iterator pBaseGlyph = pG; ++pBaseGlyph != pGEnd; )
        {
            // find the base glyph matching to the misplaced diacritic
            if( pBaseGlyph->IsClusterStart() )
                break;
            if( pBaseGlyph->IsDiacritic() )
                continue;

            // found the matching base glyph
            // => this base glyph becomes the new cluster start
            iter_swap(pG, pBaseGlyph);

            // update glyph flags of swapped glyphitems
            pG->mnFlags &= ~GlyphItem::IS_IN_CLUSTER;
            pBaseGlyph->mnFlags |= GlyphItem::IS_IN_CLUSTER;
            // prepare for checking next cluster
            pG = pBaseGlyph;
            break;
        }
    }
}

// =======================================================================

MultiSalLayout::MultiSalLayout( SalLayout& rBaseLayout, const PhysicalFontFace* pBaseFont )
:   SalLayout()
,   mnLevel( 1 )
,   mbInComplete( false )
{
    //maFallbackRuns[0].Clear();
    mpFallbackFonts[ 0 ] = pBaseFont;
    mpLayouts[ 0 ]  = &rBaseLayout;
    mnUnitsPerPixel = rBaseLayout.GetUnitsPerPixel();
}

void MultiSalLayout::SetInComplete(bool bInComplete)
{
    mbInComplete = bInComplete;
    maFallbackRuns[mnLevel-1] = ImplLayoutRuns();
}

// -----------------------------------------------------------------------

MultiSalLayout::~MultiSalLayout()
{
    for( int i = 0; i < mnLevel; ++i )
        mpLayouts[ i ]->Release();
}

// -----------------------------------------------------------------------

bool MultiSalLayout::AddFallback( SalLayout& rFallback,
    ImplLayoutRuns& rFallbackRuns, const PhysicalFontFace* pFallbackFont )
{
    if( mnLevel >= MAX_FALLBACK )
        return false;

    mpFallbackFonts[ mnLevel ]  = pFallbackFont;
    mpLayouts[ mnLevel ]        = &rFallback;
    maFallbackRuns[ mnLevel-1 ] = rFallbackRuns;
    ++mnLevel;
    return true;
}

// -----------------------------------------------------------------------

bool MultiSalLayout::LayoutText( ImplLayoutArgs& rArgs )
{
    if( mnLevel <= 1 )
        return false;
    if (!mbInComplete)
        maFallbackRuns[ mnLevel-1 ] = rArgs.maRuns;
    return true;
}

// -----------------------------------------------------------------------

void MultiSalLayout::AdjustLayout( ImplLayoutArgs& rArgs )
{
    SalLayout::AdjustLayout( rArgs );
    ImplLayoutArgs aMultiArgs = rArgs;

    if( !rArgs.mpDXArray && rArgs.mnLayoutWidth )
    {
        // for stretched text in a MultiSalLayout the target width needs to be
        // distributed by individually adjusting its virtual character widths
        long nTargetWidth = aMultiArgs.mnLayoutWidth;
        nTargetWidth *= mnUnitsPerPixel; // convert target width to base font units
        aMultiArgs.mnLayoutWidth = 0;

        // we need to get the original unmodified layouts ready
        for( int n = 0; n < mnLevel; ++n )
            mpLayouts[n]->SalLayout::AdjustLayout( aMultiArgs );
        // then we can measure the unmodified metrics
        int nCharCount = rArgs.mnEndCharPos - rArgs.mnMinCharPos;
        sal_Int32* pJustificationArray = (sal_Int32*)alloca( nCharCount * sizeof(sal_Int32) );
        FillDXArray( pJustificationArray );
        // #i17359# multilayout is not simplified yet, so calculating the
        // unjustified width needs handholding; also count the number of
        // stretchable virtual char widths
        long nOrigWidth = 0;
        int nStretchable = 0;
        for( int i = 0; i < nCharCount; ++i )
        {
            // convert array from widths to sum of widths
            nOrigWidth += pJustificationArray[i];
            if( pJustificationArray[i] > 0 )
                ++nStretchable;
        }

        // now we are able to distribute the extra width over the virtual char widths
        if( nOrigWidth && (nTargetWidth != nOrigWidth) )
        {
            int nDiffWidth = nTargetWidth - nOrigWidth;
            int nWidthSum = 0;
            for( int i = 0; i < nCharCount; ++i )
            {
                int nJustWidth = pJustificationArray[i];
                if( (nJustWidth > 0) && (nStretchable > 0) )
                {
                    int nDeltaWidth = nDiffWidth / nStretchable;
                    nJustWidth += nDeltaWidth;
                    nDiffWidth -= nDeltaWidth;
                    --nStretchable;
                }
                nWidthSum += nJustWidth;
                pJustificationArray[i] = nWidthSum;
            }
            if( nWidthSum != nTargetWidth )
                pJustificationArray[ nCharCount-1 ] = nTargetWidth;

            // the justification array is still in base level units
            // => convert it to pixel units
            if( mnUnitsPerPixel > 1 )
            {
                for( int i = 0; i < nCharCount; ++i )
                {
                    sal_Int32 nVal = pJustificationArray[ i ];
                    nVal += (mnUnitsPerPixel + 1) / 2;
                    pJustificationArray[ i ] = nVal / mnUnitsPerPixel;
                }
            }

            // change the mpDXArray temporarilly (just for the justification)
            aMultiArgs.mpDXArray = pJustificationArray;
        }
    }

    // Compute rtl flags, since in some scripts glyphs/char order can be
    // reversed for a few character sequencies e.g. Myanmar
    std::vector<bool> vRtl(rArgs.mnEndCharPos - rArgs.mnMinCharPos, false);
    rArgs.ResetPos();
    bool bRtl;
    int nRunStart, nRunEnd;
    while (rArgs.GetNextRun(&nRunStart, &nRunEnd, &bRtl))
    {
        if (bRtl) std::fill(vRtl.begin() + (nRunStart - rArgs.mnMinCharPos),
                            vRtl.begin() + (nRunEnd - rArgs.mnMinCharPos), true);
    }
    rArgs.ResetPos();

    // prepare "merge sort"
    int nStartOld[ MAX_FALLBACK ];
    int nStartNew[ MAX_FALLBACK ];
    int nCharPos[ MAX_FALLBACK ];
    sal_Int32 nGlyphAdv[ MAX_FALLBACK ];
    int nValid[ MAX_FALLBACK ] = {0};

    sal_GlyphId nDummy;
    Point aPos;
    int nLevel = 0, n;
    for( n = 0; n < mnLevel; ++n )
    {
        // now adjust the individual components
        if( n > 0 )
        {
            aMultiArgs.maRuns = maFallbackRuns[ n-1 ];
            aMultiArgs.mnFlags |= SAL_LAYOUT_FOR_FALLBACK;
        }
        mpLayouts[n]->AdjustLayout( aMultiArgs );

        // disable glyph-injection for glyph-fallback SalLayout iteration
        mpLayouts[n]->DisableGlyphInjection( true );

        // remove unused parts of component
        if( n > 0 )
        {
            if (mbInComplete && (n == mnLevel-1))
                mpLayouts[n]->Simplify( true );
            else
                mpLayouts[n]->Simplify( false );
        }

        // prepare merging components
        nStartNew[ nLevel ] = nStartOld[ nLevel ] = 0;
        nValid[ nLevel ] = mpLayouts[n]->GetNextGlyphs( 1, &nDummy, aPos,
            nStartNew[ nLevel ], &nGlyphAdv[ nLevel ], &nCharPos[ nLevel ] );
#ifdef MULTI_SL_DEBUG
        if (nValid[nLevel]) fprintf(mslLog(), "layout[%d]->GetNextGlyphs %d,%d x%d a%d c%d %x\n", n, nStartOld[nLevel], nStartNew[nLevel], aPos.X(), nGlyphAdv[nLevel], nCharPos[nLevel],
            rArgs.mpStr[nCharPos[nLevel]]);
#endif
        if( (n > 0) && !nValid[ nLevel ] )
        {
            // an empty fallback layout can be released
            mpLayouts[n]->Release();
        }
        else
        {
            // reshuffle used fallbacks if needed
            if( nLevel != n )
            {
                mpLayouts[ nLevel ]         = mpLayouts[ n ];
                mpFallbackFonts[ nLevel ]   = mpFallbackFonts[ n ];
                maFallbackRuns[ nLevel ]    = maFallbackRuns[ n ];
            }
            ++nLevel;
        }
    }
    mnLevel = nLevel;

    // merge the fallback levels
    long nXPos = 0;
    double fUnitMul = 1.0;
    for( n = 0; n < nLevel; ++n )
        maFallbackRuns[n].ResetPos();
    int nActiveCharPos = nCharPos[0];
    int nLastRunEndChar = (vRtl[nActiveCharPos - mnMinCharPos])?
        rArgs.mnEndCharPos : rArgs.mnMinCharPos - 1;
    int nRunVisibleEndChar = nCharPos[0];
    while( nValid[0] && (nLevel > 0))
    {
        // find best fallback level
        for( n = 0; n < nLevel; ++n )
            if( nValid[n] && !maFallbackRuns[n].PosIsInAnyRun( nActiveCharPos ) )
                // fallback level n wins when it requested no further fallback
                break;
        int nFBLevel = n;

        if( n < nLevel )
        {
            // use base(n==0) or fallback(n>=1) level
            fUnitMul = mnUnitsPerPixel;
            fUnitMul /= mpLayouts[n]->GetUnitsPerPixel();
            long nNewPos = static_cast<long>(nXPos/fUnitMul + 0.5);
            mpLayouts[n]->MoveGlyph( nStartOld[n], nNewPos );
        }
        else
        {
            n = 0;  // keep NotDef in base level
            fUnitMul = 1.0;
        }

        if( n > 0 )
        {
            // drop the NotDef glyphs in the base layout run if a fallback run exists
            while (
                    (maFallbackRuns[ n-1 ].PosIsInRun( nCharPos[0] ) ) &&
                    (!maFallbackRuns[ n ].PosIsInAnyRun( nCharPos[0] ) )
                  )
            {
                mpLayouts[0]->DropGlyph( nStartOld[0] );
                nStartOld[0] = nStartNew[0];
                nValid[0] = mpLayouts[0]->GetNextGlyphs( 1, &nDummy, aPos,
                    nStartNew[0], &nGlyphAdv[0], &nCharPos[0] );
#ifdef MULTI_SL_DEBUG
                if (nValid[0]) fprintf(mslLog(), "layout[0]->GetNextGlyphs %d,%d x%d a%d c%d %x\n", nStartOld[0], nStartNew[0], aPos.X(), nGlyphAdv[0], nCharPos[0], rArgs.mpStr[nCharPos[0]]);
#endif
                if( !nValid[0] )
                   break;
            }
        }

        // skip to end of layout run and calculate its advance width
        int nRunAdvance = 0;
        bool bKeepNotDef = (nFBLevel >= nLevel);
        for(;;)
        {
            nRunAdvance += nGlyphAdv[n];

            // proceed to next glyph
            nStartOld[n] = nStartNew[n];
            int nOrigCharPos = nCharPos[n];
            nValid[n] = mpLayouts[n]->GetNextGlyphs( 1, &nDummy, aPos,
                nStartNew[n], &nGlyphAdv[n], &nCharPos[n] );
#ifdef MULTI_SL_DEBUG
            if (nValid[n]) fprintf(mslLog(), "layout[%d]->GetNextGlyphs %d,%d a%d c%d %x\n", n, nStartOld[n], nStartNew[n], nGlyphAdv[n], nCharPos[n], rArgs.mpStr[nCharPos[n]]);
#endif
            // break after last glyph of active layout
            if( !nValid[n] )
            {
                // performance optimization (when a fallback layout is no longer needed)
                if( n >= nLevel-1 )
                    --nLevel;
                break;
            }

            //If the next character is one which belongs to the next level, then we
            //are finished here for now, and we'll pick up after the next level has
            //been processed
            if ((n+1 < nLevel) && (nCharPos[n] != nOrigCharPos))
            {
                if (nOrigCharPos < nCharPos[n])
                {
                    if (nCharPos[n+1] > nOrigCharPos && (nCharPos[n+1] < nCharPos[n]))
                        break;
                }
                else if (nOrigCharPos > nCharPos[n])
                {
                    if (nCharPos[n+1] > nCharPos[n] && (nCharPos[n+1] < nOrigCharPos))
                        break;
                }
            }

            // break at end of layout run
            if( n > 0 )
            {
                // skip until end of fallback run
                if( !maFallbackRuns[n-1].PosIsInRun( nCharPos[n] ) )
                    break;
            }
            else
            {
                // break when a fallback is needed and available
                bool bNeedFallback = maFallbackRuns[0].PosIsInRun( nCharPos[0] );
                if( bNeedFallback )
                    if( !maFallbackRuns[ nLevel-1 ].PosIsInRun( nCharPos[0] ) )
                        break;
                // break when change from resolved to unresolved base layout run
                if( bKeepNotDef && !bNeedFallback )
                    { maFallbackRuns[0].NextRun(); break; }
                bKeepNotDef = bNeedFallback;
            }
            // check for reordered glyphs
            if (aMultiArgs.mpDXArray &&
                nRunVisibleEndChar < mnEndCharPos &&
                nRunVisibleEndChar >= mnMinCharPos &&
                nCharPos[n] < mnEndCharPos &&
                nCharPos[n] >= mnMinCharPos)
            {
                if (vRtl[nActiveCharPos - mnMinCharPos])
                {
                    if (aMultiArgs.mpDXArray[nRunVisibleEndChar-mnMinCharPos]
                        >= aMultiArgs.mpDXArray[nCharPos[n] - mnMinCharPos])
                    {
                        nRunVisibleEndChar = nCharPos[n];
                    }
                }
                else if (aMultiArgs.mpDXArray[nRunVisibleEndChar-mnMinCharPos]
                         <= aMultiArgs.mpDXArray[nCharPos[n] - mnMinCharPos])
                {
                    nRunVisibleEndChar = nCharPos[n];
                }
            }
        }

        // if a justification array is available
        // => use it directly to calculate the corresponding run width
        if( aMultiArgs.mpDXArray )
        {
            // the run advance is the width from the first char
            // in the run to the first char in the next run
            nRunAdvance = 0;
#ifdef MULTI_SL_DEBUG
            const bool bLTR = !(vRtl[nActiveCharPos - mnMinCharPos]);//(nActiveCharPos < nCharPos[0]);
            int nOldRunAdv = 0;
            int nDXIndex = nCharPos[0] - mnMinCharPos - bLTR;
            if( nDXIndex >= 0 )
                nOldRunAdv += aMultiArgs.mpDXArray[ nDXIndex ];
            nDXIndex = nActiveCharPos - mnMinCharPos - bLTR;
            if( nDXIndex >= 0 )
                nOldRunAdv -= aMultiArgs.mpDXArray[ nDXIndex ];
            if( !bLTR )
                nOldRunAdv = -nOldRunAdv;
#endif
            if (vRtl[nActiveCharPos - mnMinCharPos])
            {
              if (nRunVisibleEndChar > mnMinCharPos && nRunVisibleEndChar <= mnEndCharPos)
                  nRunAdvance -= aMultiArgs.mpDXArray[nRunVisibleEndChar - 1 - mnMinCharPos];
              if (nLastRunEndChar > mnMinCharPos && nLastRunEndChar <= mnEndCharPos)
                  nRunAdvance += aMultiArgs.mpDXArray[nLastRunEndChar - 1 - mnMinCharPos];
#ifdef MULTI_SL_DEBUG
              fprintf(mslLog(), "rtl visible %d-%d,%d-%d adv%d(%d)\n", nLastRunEndChar-1, nRunVisibleEndChar-1, nActiveCharPos - bLTR, nCharPos[0] - bLTR, nRunAdvance, nOldRunAdv);
#endif
            }
            else
            {
                if (nRunVisibleEndChar >= mnMinCharPos)
                  nRunAdvance += aMultiArgs.mpDXArray[nRunVisibleEndChar - mnMinCharPos];
                if (nLastRunEndChar >= mnMinCharPos)
                  nRunAdvance -= aMultiArgs.mpDXArray[nLastRunEndChar - mnMinCharPos];
#ifdef MULTI_SL_DEBUG
                fprintf(mslLog(), "visible %d-%d,%d-%d adv%d(%d)\n", nLastRunEndChar, nRunVisibleEndChar, nActiveCharPos - bLTR, nCharPos[0] - bLTR, nRunAdvance, nOldRunAdv);
#endif
            }
            nLastRunEndChar = nRunVisibleEndChar;
            nRunVisibleEndChar = nCharPos[0];
            // the requested width is still in pixel units
            // => convert it to base level font units
            nRunAdvance *= mnUnitsPerPixel;
        }
        else
        {
            // the measured width is still in fallback font units
            // => convert it to base level font units
            if( n > 0 ) // optimization: because (fUnitMul==1.0) for (n==0)
                nRunAdvance = static_cast<long>(nRunAdvance*fUnitMul + 0.5);
        }

        // calculate new x position (in base level units)
        nXPos += nRunAdvance;

        // prepare for next fallback run
        nActiveCharPos = nCharPos[0];
        // it essential that the runs don't get ahead of themselves and in the
        // if( bKeepNotDef && !bNeedFallback ) statement above, the next run may
        // have already been reached on the base level
        for( int i = nFBLevel; --i >= 0;)
        {
            if (maFallbackRuns[i].GetRun(&nRunStart, &nRunEnd, &bRtl))
            {
                if (bRtl)
                {
                    if (nRunStart > nActiveCharPos)
                        maFallbackRuns[i].NextRun();
                }
                else
                {
                    if (nRunEnd <= nActiveCharPos)
                        maFallbackRuns[i].NextRun();
                }
            }
        }
//            if( !maFallbackRuns[i].PosIsInRun( nActiveCharPos ) )
//                maFallbackRuns[i].NextRun();
    }

    mpLayouts[0]->Simplify( true );

    // reenable glyph-injection
    for( n = 0; n < mnLevel; ++n )
        mpLayouts[n]->DisableGlyphInjection( false );
}

// -----------------------------------------------------------------------

void MultiSalLayout::InitFont() const
{
    if( mnLevel > 0 )
        mpLayouts[0]->InitFont();
}

// -----------------------------------------------------------------------

const PhysicalFontFace* MultiSalLayout::GetFallbackFontData( sal_GlyphId nGlyphId ) const
{
    int nFallbackLevel = (nGlyphId & GF_FONTMASK) >> GF_FONTSHIFT;
    return mpFallbackFonts[ nFallbackLevel ];
}

// -----------------------------------------------------------------------

void MultiSalLayout::DrawText( SalGraphics& rGraphics ) const
{
    for( int i = mnLevel; --i >= 0; )
    {
        SalLayout& rLayout = *mpLayouts[ i ];
        rLayout.DrawBase() += maDrawBase;
        rLayout.DrawOffset() += maDrawOffset;
        rLayout.InitFont();
        rLayout.DrawText( rGraphics );
        rLayout.DrawOffset() -= maDrawOffset;
        rLayout.DrawBase() -= maDrawBase;
    }
    // NOTE: now the baselevel font is active again
}

 // -----------------------------------------------------------------------

int MultiSalLayout::GetTextBreak( long nMaxWidth, long nCharExtra, int nFactor ) const
{
    if( mnLevel <= 0 )
        return STRING_LEN;
    if( mnLevel == 1 )
        return mpLayouts[0]->GetTextBreak( nMaxWidth, nCharExtra, nFactor );

    int nCharCount = mnEndCharPos - mnMinCharPos;
    sal_Int32* pCharWidths = (sal_Int32*)alloca( 2*nCharCount * sizeof(sal_Int32) );
    mpLayouts[0]->FillDXArray( pCharWidths );

    for( int n = 1; n < mnLevel; ++n )
    {
        SalLayout& rLayout = *mpLayouts[ n ];
        rLayout.FillDXArray( pCharWidths + nCharCount );
        double fUnitMul = mnUnitsPerPixel;
        fUnitMul /= rLayout.GetUnitsPerPixel();
        for( int i = 0; i < nCharCount; ++i )
        {
            long w = pCharWidths[ i + nCharCount ];
            w = static_cast<long>(w*fUnitMul + 0.5);
            pCharWidths[ i ] += w;
        }
    }

    long nWidth = 0;
    for( int i = 0; i < nCharCount; ++i )
    {
        nWidth += pCharWidths[ i ] * nFactor;
        if( nWidth > nMaxWidth )
            return (i + mnMinCharPos);
        nWidth += nCharExtra;
    }

    return STRING_LEN;
}

// -----------------------------------------------------------------------

long MultiSalLayout::FillDXArray( sal_Int32* pCharWidths ) const
{
    long nMaxWidth = 0;

    // prepare merging of fallback levels
    sal_Int32* pTempWidths = NULL;
    const int nCharCount = mnEndCharPos - mnMinCharPos;
    if( pCharWidths )
    {
        for( int i = 0; i < nCharCount; ++i )
            pCharWidths[i] = 0;
        pTempWidths = (sal_Int32*)alloca( nCharCount * sizeof(sal_Int32) );
    }

    for( int n = mnLevel; --n >= 0; )
    {
        // query every fallback level
        long nTextWidth = mpLayouts[n]->FillDXArray( pTempWidths );
        if( !nTextWidth )
            continue;
        // merge results from current level
        double fUnitMul = mnUnitsPerPixel;
        fUnitMul /= mpLayouts[n]->GetUnitsPerPixel();
        nTextWidth = static_cast<long>(nTextWidth * fUnitMul + 0.5);
        if( nMaxWidth < nTextWidth )
            nMaxWidth = nTextWidth;
        if( !pCharWidths )
            continue;
        // calculate virtual char widths using most probable fallback layout
        for( int i = 0; i < nCharCount; ++i )
        {
            // #i17359# restriction:
            // one char cannot be resolved from different fallbacks
            if( pCharWidths[i] != 0 )
                continue;
            long nCharWidth = pTempWidths[i];
            if( !nCharWidth )
                continue;
            nCharWidth = static_cast<long>(nCharWidth * fUnitMul + 0.5);
            pCharWidths[i] = nCharWidth;
        }
    }

    return nMaxWidth;
}

// -----------------------------------------------------------------------

void MultiSalLayout::GetCaretPositions( int nMaxIndex, sal_Int32* pCaretXArray ) const
{
    SalLayout& rLayout = *mpLayouts[ 0 ];
    rLayout.GetCaretPositions( nMaxIndex, pCaretXArray );

    if( mnLevel > 1 )
    {
        sal_Int32* pTempPos = (sal_Int32*)alloca( nMaxIndex * sizeof(sal_Int32) );
        for( int n = 1; n < mnLevel; ++n )
        {
            mpLayouts[ n ]->GetCaretPositions( nMaxIndex, pTempPos );
            double fUnitMul = mnUnitsPerPixel;
            fUnitMul /= mpLayouts[n]->GetUnitsPerPixel();
            for( int i = 0; i < nMaxIndex; ++i )
                if( pTempPos[i] >= 0 )
                {
                    long w = pTempPos[i];
                    w = static_cast<long>(w*fUnitMul + 0.5);
                    pCaretXArray[i] = w;
                }
        }
    }
}

// -----------------------------------------------------------------------

int MultiSalLayout::GetNextGlyphs( int nLen, sal_GlyphId* pGlyphIdxAry, Point& rPos,
    int& nStart, sal_Int32* pGlyphAdvAry, int* pCharPosAry ) const
{
    // for multi-level fallback only single glyphs should be used
    if( mnLevel > 1 && nLen > 1 )
        nLen = 1;

    // NOTE: nStart is tagged with current font index
    int nLevel = static_cast<unsigned>(nStart) >> GF_FONTSHIFT;
    nStart &= ~GF_FONTMASK;
    for(; nLevel < mnLevel; ++nLevel, nStart=0 )
    {
        SalLayout& rLayout = *mpLayouts[ nLevel ];
        rLayout.InitFont();
        int nRetVal = rLayout.GetNextGlyphs( nLen, pGlyphIdxAry, rPos,
            nStart, pGlyphAdvAry, pCharPosAry );
        if( nRetVal )
        {
            int nFontTag = nLevel << GF_FONTSHIFT;
            nStart |= nFontTag;
            double fUnitMul = mnUnitsPerPixel;
            fUnitMul /= mpLayouts[nLevel]->GetUnitsPerPixel();
            for( int i = 0; i < nRetVal; ++i )
            {
                if( pGlyphAdvAry )
                {
                    long w = pGlyphAdvAry[i];
                    w = static_cast<long>(w * fUnitMul + 0.5);
                    pGlyphAdvAry[i] = w;
                }
                pGlyphIdxAry[ i ] |= nFontTag;
            }
            rPos += maDrawBase;
            rPos += maDrawOffset;
            return nRetVal;
        }
    }

    // #111016# reset to base level font when done
    mpLayouts[0]->InitFont();
    return 0;
}

// -----------------------------------------------------------------------

bool MultiSalLayout::GetOutline( SalGraphics& rGraphics,
    ::basegfx::B2DPolyPolygonVector& rPPV ) const
{
    bool bRet = false;

    for( int i = mnLevel; --i >= 0; )
    {
        SalLayout& rLayout = *mpLayouts[ i ];
        rLayout.DrawBase() = maDrawBase;
        rLayout.DrawOffset() += maDrawOffset;
        rLayout.InitFont();
        bRet |= rLayout.GetOutline( rGraphics, rPPV );
        rLayout.DrawOffset() -= maDrawOffset;
    }

    return bRet;
}

// -----------------------------------------------------------------------

bool MultiSalLayout::GetBoundRect( SalGraphics& rGraphics, Rectangle& rRect ) const
{
    bool bRet = false;

    Rectangle aRectangle;
    for( int i = mnLevel; --i >= 0; )
    {
        SalLayout& rLayout = *mpLayouts[ i ];
        rLayout.DrawBase() = maDrawBase;
        rLayout.DrawOffset() += maDrawOffset;
        rLayout.InitFont();
        if( rLayout.GetBoundRect( rGraphics, aRectangle ) )
        {
            rRect.Union( aRectangle );
            bRet = true;
        }
        rLayout.DrawOffset() -= maDrawOffset;
    }

    return bRet;
}

// =======================================================================

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */