src/gui/text/qtextengine.cpp

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  41
  42 #include "qdebug.h"
  43 #include "qtextformat.h"
  44 #include "qtextformat_p.h"
  45 #include "qtextengine_p.h"
  46 #include "qabstracttextdocumentlayout.h"
  47 #include "qtextlayout.h"
  48 #include "qtextboundaryfinder.h"
  49 #include "qvarlengtharray.h"
  50 #include "qfont.h"
  51 #include "qfont_p.h"
  52 #include "qfontengine_p.h"
  53 #include "qstring.h"
  54 #include <private/qunicodetables_p.h>
  55 #include "qtextdocument_p.h"
  56 #include <qguiapplication.h>
  57 #include <stdlib.h>
  58
  59
  60 QT_BEGIN_NAMESPACE
  61
  62 namespace {
  63 // Helper class used in QTextEngine::itemize
  64 // keep it out here to allow us to keep supporting various compilers.
  65 class Itemizer {
  66 public:
  67     Itemizer(const QString &string, const QScriptAnalysis *analysis, QScriptItemArray &items)
  68         : m_string(string),
  69         m_analysis(analysis),
  70         m_items(items),
  71         m_splitter(0)
  72     {
  73     }
  74     ~Itemizer()
  75     {
  76         delete m_splitter;
  77     }
  78
  79     /// generate the script items
  80     /// The caps parameter is used to choose the algoritm of splitting text and assiging roles to the textitems
  81     void generate(int start, int length, QFont::Capitalization caps)
  82     {
  83         if ((int)caps == (int)QFont::SmallCaps)
  84             generateScriptItemsSmallCaps(reinterpret_cast<const ushort *>(m_string.unicode()), start, length);
  85         else if(caps == QFont::Capitalize)
  86             generateScriptItemsCapitalize(start, length);
  87         else if(caps != QFont::MixedCase) {
  88             generateScriptItemsAndChangeCase(start, length,
  89                 caps == QFont::AllLowercase ? QScriptAnalysis::Lowercase : QScriptAnalysis::Uppercase);
  90         }
  91         else
  92             generateScriptItems(start, length);
  93     }
  94
  95 private:
  96     enum { MaxItemLength = 4096 };
  97
  98     void generateScriptItemsAndChangeCase(int start, int length, QScriptAnalysis::Flags flags)
  99     {
 100         generateScriptItems(start, length);
 101         if (m_items.isEmpty()) // the next loop won't work in that case
 102             return;
 103         QScriptItemArray::Iterator iter = m_items.end();
 104         do {
 105             iter--;
 106             if (iter->analysis.flags < QScriptAnalysis::TabOrObject)
 107                 iter->analysis.flags = flags;
 108         } while (iter->position > start);
 109     }
 110
 111     void generateScriptItems(int start, int length)
 112     {
 113         if (!length)
 114             return;
 115         const int end = start + length;
 116         for (int i = start + 1; i < end; ++i) {
 117             if ((m_analysis[i] == m_analysis[start])
 118                 && m_analysis[i].flags < QScriptAnalysis::SpaceTabOrObject
 119                 && i - start < MaxItemLength)
 120                 continue;
 121             m_items.append(QScriptItem(start, m_analysis[start]));
 122             start = i;
 123         }
 124         m_items.append(QScriptItem(start, m_analysis[start]));
 125     }
 126
 127     void generateScriptItemsCapitalize(int start, int length)
 128     {
 129         if (!length)
 130             return;
 131
 132         if (!m_splitter)
 133             m_splitter = new QTextBoundaryFinder(QTextBoundaryFinder::Word,
 134                                                  m_string.constData(), m_string.length(),
 135                                                  /*buffer*/0, /*buffer size*/0);
 136
 137         m_splitter->setPosition(start);
 138         QScriptAnalysis itemAnalysis = m_analysis[start];
 139
 140         if (m_splitter->boundaryReasons() & QTextBoundaryFinder::StartWord) {
 141             itemAnalysis.flags = QScriptAnalysis::Uppercase;
 142             m_splitter->toNextBoundary();
 143         }
 144
 145         const int end = start + length;
 146         for (int i = start + 1; i < end; ++i) {
 147
 148             bool atWordBoundary = false;
 149
 150             if (i == m_splitter->position()) {
 151                 if (m_splitter->boundaryReasons() & QTextBoundaryFinder::StartWord
 152                     && m_analysis[i].flags < QScriptAnalysis::TabOrObject)
 153                     atWordBoundary = true;
 154
 155                 m_splitter->toNextBoundary();
 156             }
 157
 158             if (m_analysis[i] == itemAnalysis
 159                 && m_analysis[i].flags < QScriptAnalysis::TabOrObject
 160                 && !atWordBoundary
 161                 && i - start < MaxItemLength)
 162                 continue;
 163
 164             m_items.append(QScriptItem(start, itemAnalysis));
 165             start = i;
 166             itemAnalysis = m_analysis[start];
 167
 168             if (atWordBoundary)
 169                 itemAnalysis.flags = QScriptAnalysis::Uppercase;
 170         }
 171         m_items.append(QScriptItem(start, itemAnalysis));
 172     }
 173
 174     void generateScriptItemsSmallCaps(const ushort *uc, int start, int length)
 175     {
 176         if (!length)
 177             return;
 178         bool lower = (QChar::category(uc[start]) == QChar::Letter_Lowercase);
 179         const int end = start + length;
 180         // split text into parts that are already uppercase and parts that are lowercase, and mark the latter to be uppercased later.
 181         for (int i = start + 1; i < end; ++i) {
 182             bool l = (QChar::category(uc[i]) == QChar::Letter_Lowercase);
 183             if ((m_analysis[i] == m_analysis[start])
 184                 && m_analysis[i].flags < QScriptAnalysis::TabOrObject
 185                 && l == lower
 186                 && i - start < MaxItemLength)
 187                 continue;
 188             m_items.append(QScriptItem(start, m_analysis[start]));
 189             if (lower)
 190                 m_items.last().analysis.flags = QScriptAnalysis::SmallCaps;
 191
 192             start = i;
 193             lower = l;
 194         }
 195         m_items.append(QScriptItem(start, m_analysis[start]));
 196         if (lower)
 197             m_items.last().analysis.flags = QScriptAnalysis::SmallCaps;
 198     }
 199
 200     const QString &m_string;
 201     const QScriptAnalysis * const m_analysis;
 202     QScriptItemArray &m_items;
 203     QTextBoundaryFinder *m_splitter;
 204 };
 205 }
 206
 207
 208 // ----------------------------------------------------------------------------
 209 //
 210 // The BiDi algorithm
 211 //
 212 // ----------------------------------------------------------------------------
 213
 214 #define BIDI_DEBUG 0
 215 #if (BIDI_DEBUG >= 1)
 216 QT_BEGIN_INCLUDE_NAMESPACE
 217 #include <iostream>
 218 QT_END_INCLUDE_NAMESPACE
 219 using namespace std;
 220
 221 static const char *directions[] = {
 222     "DirL", "DirR", "DirEN", "DirES", "DirET", "DirAN", "DirCS", "DirB", "DirS", "DirWS", "DirON",
 223     "DirLRE", "DirLRO", "DirAL", "DirRLE", "DirRLO", "DirPDF", "DirNSM", "DirBN"
 224 };
 225
 226 #endif
 227
 228 struct QBidiStatus {
 229     QBidiStatus() {
 230         eor = QChar::DirON;
 231         lastStrong = QChar::DirON;
 232         last = QChar:: DirON;
 233         dir = QChar::DirON;
 234     }
 235     QChar::Direction eor;
 236     QChar::Direction lastStrong;
 237     QChar::Direction last;
 238     QChar::Direction dir;
 239 };
 240
 241 enum { MaxBidiLevel = 61 };
 242
 243 struct QBidiControl {
 244     inline QBidiControl(bool rtl)
 245         : cCtx(0), base(rtl ? 1 : 0), level(rtl ? 1 : 0), override(false) {}
 246
 247     inline void embed(bool rtl, bool o = false) {
 248         unsigned int toAdd = 1;
 249         if((level%2 != 0) == rtl ) {
 250             ++toAdd;
 251         }
 252         if (level + toAdd <= MaxBidiLevel) {
 253             ctx[cCtx].level = level;
 254             ctx[cCtx].override = override;
 255             cCtx++;
 256             override = o;
 257             level += toAdd;
 258         }
 259     }
 260     inline bool canPop() const { return cCtx != 0; }
 261     inline void pdf() {
 262         Q_ASSERT(cCtx);
 263         --cCtx;
 264         level = ctx[cCtx].level;
 265         override = ctx[cCtx].override;
 266     }
 267
 268     inline QChar::Direction basicDirection() const {
 269         return (base ? QChar::DirR : QChar:: DirL);
 270     }
 271     inline unsigned int baseLevel() const {
 272         return base;
 273     }
 274     inline QChar::Direction direction() const {
 275         return ((level%2) ? QChar::DirR : QChar:: DirL);
 276     }
 277
 278     struct {
 279         unsigned int level;
 280         bool override;
 281     } ctx[MaxBidiLevel];
 282     unsigned int cCtx;
 283     const unsigned int base;
 284     unsigned int level;
 285     bool override;
 286 };
 287
 288
 289 static void appendItems(QScriptAnalysis *analysis, int &start, int &stop, const QBidiControl &control, QChar::Direction dir)
 290 {
 291     if (start > stop)
 292         return;
 293
 294     int level = control.level;
 295
 296     if(dir != QChar::DirON && !control.override) {
 297         // add level of run (cases I1 & I2)
 298         if(level % 2) {
 299             if(dir == QChar::DirL || dir == QChar::DirAN || dir == QChar::DirEN)
 300                 level++;
 301         } else {
 302             if(dir == QChar::DirR)
 303                 level++;
 304             else if(dir == QChar::DirAN || dir == QChar::DirEN)
 305                 level += 2;
 306         }
 307     }
 308
 309 #if (BIDI_DEBUG >= 1)
 310     qDebug("new run: dir=%s from %d, to %d level = %d override=%d", directions[dir], start, stop, level, control.override);
 311 #endif
 312     QScriptAnalysis *s = analysis + start;
 313     const QScriptAnalysis *e = analysis + stop;
 314     while (s <= e) {
 315         s->bidiLevel = level;
 316         ++s;
 317     }
 318     ++stop;
 319     start = stop;
 320 }
 321
 322 static QChar::Direction skipBoundryNeutrals(QScriptAnalysis *analysis,
 323                                             const ushort *unicode, int length,
 324                                             int &sor, int &eor, QBidiControl &control)
 325 {
 326     QChar::Direction dir = control.basicDirection();
 327     int level = sor > 0 ? analysis[sor - 1].bidiLevel : control.level;
 328     while (sor < length) {
 329         dir = QChar::direction(unicode[sor]);
 330         // Keep skipping DirBN as if it doesn't exist
 331         if (dir != QChar::DirBN)
 332             break;
 333         analysis[sor++].bidiLevel = level;
 334     }
 335
 336     eor = sor;
 337     if (eor == length)
 338         dir = control.basicDirection();
 339
 340     return dir;
 341 }
 342
 343 // creates the next QScript items.
 344 static bool bidiItemize(QTextEngine *engine, QScriptAnalysis *analysis, QBidiControl &control)
 345 {
 346     bool rightToLeft = (control.basicDirection() == 1);
 347     bool hasBidi = rightToLeft;
 348 #if BIDI_DEBUG >= 2
 349     qDebug() << "bidiItemize: rightToLeft=" << rightToLeft << engine->layoutData->string;
 350 #endif
 351
 352     int sor = 0;
 353     int eor = -1;
 354
 355
 356     int length = engine->layoutData->string.length();
 357
 358     const ushort *unicode = (const ushort *)engine->layoutData->string.unicode();
 359     int current = 0;
 360
 361     QChar::Direction dir = rightToLeft ? QChar::DirR : QChar::DirL;
 362     QBidiStatus status;
 363
 364     QChar::Direction sdir = QChar::direction(*unicode);
 365     if (sdir != QChar::DirL && sdir != QChar::DirR && sdir != QChar::DirEN && sdir != QChar::DirAN)
 366         sdir = QChar::DirON;
 367     else
 368         dir = QChar::DirON;
 369     status.eor = sdir;
 370     status.lastStrong = rightToLeft ? QChar::DirR : QChar::DirL;
 371     status.last = status.lastStrong;
 372     status.dir = sdir;
 373
 374
 375     while (current <= length) {
 376
 377         QChar::Direction dirCurrent;
 378         if (current == (int)length)
 379             dirCurrent = control.basicDirection();
 380         else
 381             dirCurrent = QChar::direction(unicode[current]);
 382
 383 #if (BIDI_DEBUG >= 2)
 384 //         qDebug() << "pos=" << current << " dir=" << directions[dir]
 385 //                  << " current=" << directions[dirCurrent] << " last=" << directions[status.last]
 386 //                  << " eor=" << eor << '/' << directions[status.eor]
 387 //                  << " sor=" << sor << " lastStrong="
 388 //                  << directions[status.lastStrong]
 389 //                  << " level=" << (int)control.level << " override=" << (bool)control.override;
 390 #endif
 391
 392         switch(dirCurrent) {
 393
 394             // embedding and overrides (X1-X9 in the BiDi specs)
 395         case QChar::DirRLE:
 396         case QChar::DirRLO:
 397         case QChar::DirLRE:
 398         case QChar::DirLRO:
 399             {
 400                 bool rtl = (dirCurrent == QChar::DirRLE || dirCurrent == QChar::DirRLO);
 401                 hasBidi |= rtl;
 402                 bool override = (dirCurrent == QChar::DirLRO || dirCurrent == QChar::DirRLO);
 403
 404                 unsigned int level = control.level+1;
 405                 if ((level%2 != 0) == rtl) ++level;
 406                 if(level < MaxBidiLevel) {
 407                     eor = current-1;
 408                     appendItems(analysis, sor, eor, control, dir);
 409                     eor = current;
 410                     control.embed(rtl, override);
 411                     QChar::Direction edir = (rtl ? QChar::DirR : QChar::DirL);
 412                     dir = status.eor = edir;
 413                     status.lastStrong = edir;
 414                 }
 415                 break;
 416             }
 417         case QChar::DirPDF:
 418             {
 419                 if (control.canPop()) {
 420                     if (dir != control.direction()) {
 421                         eor = current-1;
 422                         appendItems(analysis, sor, eor, control, dir);
 423                         dir = control.direction();
 424                     }
 425                     eor = current;
 426                     appendItems(analysis, sor, eor, control, dir);
 427                     control.pdf();
 428                     dir = QChar::DirON; status.eor = QChar::DirON;
 429                     status.last = control.direction();
 430                     if (control.override)
 431                         dir = control.direction();
 432                     else
 433                         dir = QChar::DirON;
 434                     status.lastStrong = control.direction();
 435                 }
 436                 break;
 437             }
 438
 439             // strong types
 440         case QChar::DirL:
 441             if(dir == QChar::DirON)
 442                 dir = QChar::DirL;
 443             switch(status.last)
 444                 {
 445                 case QChar::DirL:
 446                     eor = current; status.eor = QChar::DirL; break;
 447                 case QChar::DirR:
 448                 case QChar::DirAL:
 449                 case QChar::DirEN:
 450                 case QChar::DirAN:
 451                     if (eor >= 0) {
 452                         appendItems(analysis, sor, eor, control, dir);
 453                         status.eor = dir = skipBoundryNeutrals(analysis, unicode, length, sor, eor, control);
 454                     } else {
 455                         eor = current; status.eor = dir;
 456                     }
 457                     break;
 458                 case QChar::DirES:
 459                 case QChar::DirET:
 460                 case QChar::DirCS:
 461                 case QChar::DirBN:
 462                 case QChar::DirB:
 463                 case QChar::DirS:
 464                 case QChar::DirWS:
 465                 case QChar::DirON:
 466                     if(dir != QChar::DirL) {
 467                         //last stuff takes embedding dir
 468                         if(control.direction() == QChar::DirR) {
 469                             if(status.eor != QChar::DirR) {
 470                                 // AN or EN
 471                                 appendItems(analysis, sor, eor, control, dir);
 472                                 status.eor = QChar::DirON;
 473                                 dir = QChar::DirR;
 474                             }
 475                             eor = current - 1;
 476                             appendItems(analysis, sor, eor, control, dir);
 477                             status.eor = dir = skipBoundryNeutrals(analysis, unicode, length, sor, eor, control);
 478                         } else {
 479                             if(status.eor != QChar::DirL) {
 480                                 appendItems(analysis, sor, eor, control, dir);
 481                                 status.eor = QChar::DirON;
 482                                 dir = QChar::DirL;
 483                             } else {
 484                                 eor = current; status.eor = QChar::DirL; break;
 485                             }
 486                         }
 487                     } else {
 488                         eor = current; status.eor = QChar::DirL;
 489                     }
 490                 default:
 491                     break;
 492                 }
 493             status.lastStrong = QChar::DirL;
 494             break;
 495         case QChar::DirAL:
 496         case QChar::DirR:
 497             hasBidi = true;
 498             if(dir == QChar::DirON) dir = QChar::DirR;
 499             switch(status.last)
 500                 {
 501                 case QChar::DirL:
 502                 case QChar::DirEN:
 503                 case QChar::DirAN:
 504                     if (eor >= 0)
 505                         appendItems(analysis, sor, eor, control, dir);
 506                     // fall through
 507                 case QChar::DirR:
 508                 case QChar::DirAL:
 509                     dir = QChar::DirR; eor = current; status.eor = QChar::DirR; break;
 510                 case QChar::DirES:
 511                 case QChar::DirET:
 512                 case QChar::DirCS:
 513                 case QChar::DirBN:
 514                 case QChar::DirB:
 515                 case QChar::DirS:
 516                 case QChar::DirWS:
 517                 case QChar::DirON:
 518                     if(status.eor != QChar::DirR && status.eor != QChar::DirAL) {
 519                         //last stuff takes embedding dir
 520                         if(control.direction() == QChar::DirR
 521                            || status.lastStrong == QChar::DirR || status.lastStrong == QChar::DirAL) {
 522                             appendItems(analysis, sor, eor, control, dir);
 523                             dir = QChar::DirR; status.eor = QChar::DirON;
 524                             eor = current;
 525                         } else {
 526                             eor = current - 1;
 527                             appendItems(analysis, sor, eor, control, dir);
 528                             dir = QChar::DirR; status.eor = QChar::DirON;
 529                         }
 530                     } else {
 531                         eor = current; status.eor = QChar::DirR;
 532                     }
 533                 default:
 534                     break;
 535                 }
 536             status.lastStrong = dirCurrent;
 537             break;
 538
 539             // weak types:
 540
 541         case QChar::DirNSM:
 542             if (eor == current-1)
 543                 eor = current;
 544             break;
 545         case QChar::DirEN:
 546             // if last strong was AL change EN to AN
 547             if(status.lastStrong != QChar::DirAL) {
 548                 if(dir == QChar::DirON) {
 549                     if(status.lastStrong == QChar::DirL)
 550                         dir = QChar::DirL;
 551                     else
 552                         dir = QChar::DirEN;
 553                 }
 554                 switch(status.last)
 555                     {
 556                     case QChar::DirET:
 557                         if (status.lastStrong == QChar::DirR || status.lastStrong == QChar::DirAL) {
 558                             appendItems(analysis, sor, eor, control, dir);
 559                             status.eor = QChar::DirON;
 560                             dir = QChar::DirAN;
 561                         }
 562                         // fall through
 563                     case QChar::DirEN:
 564                     case QChar::DirL:
 565                         eor = current;
 566                         status.eor = dirCurrent;
 567                         break;
 568                     case QChar::DirR:
 569                     case QChar::DirAL:
 570                     case QChar::DirAN:
 571                         if (eor >= 0)
 572                             appendItems(analysis, sor, eor, control, dir);
 573                         else
 574                             eor = current;
 575                         status.eor = QChar::DirEN;
 576                         dir = QChar::DirAN; break;
 577                     case QChar::DirES:
 578                     case QChar::DirCS:
 579                         if(status.eor == QChar::DirEN || dir == QChar::DirAN) {
 580                             eor = current; break;
 581                         }
 582                     case QChar::DirBN:
 583                     case QChar::DirB:
 584                     case QChar::DirS:
 585                     case QChar::DirWS:
 586                     case QChar::DirON:
 587                         if(status.eor == QChar::DirR) {
 588                             // neutrals go to R
 589                             eor = current - 1;
 590                             appendItems(analysis, sor, eor, control, dir);
 591                             dir = QChar::DirON; status.eor = QChar::DirEN;
 592                             dir = QChar::DirAN;
 593                         }
 594                         else if(status.eor == QChar::DirL ||
 595                                  (status.eor == QChar::DirEN && status.lastStrong == QChar::DirL)) {
 596                             eor = current; status.eor = dirCurrent;
 597                         } else {
 598                             // numbers on both sides, neutrals get right to left direction
 599                             if(dir != QChar::DirL) {
 600                                 appendItems(analysis, sor, eor, control, dir);
 601                                 dir = QChar::DirON; status.eor = QChar::DirON;
 602                                 eor = current - 1;
 603                                 dir = QChar::DirR;
 604                                 appendItems(analysis, sor, eor, control, dir);
 605                                 dir = QChar::DirON; status.eor = QChar::DirON;
 606                                 dir = QChar::DirAN;
 607                             } else {
 608                                 eor = current; status.eor = dirCurrent;
 609                             }
 610                         }
 611                     default:
 612                         break;
 613                     }
 614                 break;
 615             }
 616         case QChar::DirAN:
 617             hasBidi = true;
 618             dirCurrent = QChar::DirAN;
 619             if(dir == QChar::DirON) dir = QChar::DirAN;
 620             switch(status.last)
 621                 {
 622                 case QChar::DirL:
 623                 case QChar::DirAN:
 624                     eor = current; status.eor = QChar::DirAN; break;
 625                 case QChar::DirR:
 626                 case QChar::DirAL:
 627                 case QChar::DirEN:
 628                     if (eor >= 0){
 629                         appendItems(analysis, sor, eor, control, dir);
 630                     } else {
 631                         eor = current;
 632                     }
 633                     dir = QChar::DirAN; status.eor = QChar::DirAN;
 634                     break;
 635                 case QChar::DirCS:
 636                     if(status.eor == QChar::DirAN) {
 637                         eor = current; break;
 638                     }
 639                 case QChar::DirES:
 640                 case QChar::DirET:
 641                 case QChar::DirBN:
 642                 case QChar::DirB:
 643                 case QChar::DirS:
 644                 case QChar::DirWS:
 645                 case QChar::DirON:
 646                     if(status.eor == QChar::DirR) {
 647                         // neutrals go to R
 648                         eor = current - 1;
 649                         appendItems(analysis, sor, eor, control, dir);
 650                         status.eor = QChar::DirAN;
 651                         dir = QChar::DirAN;
 652                     } else if(status.eor == QChar::DirL ||
 653                                (status.eor == QChar::DirEN && status.lastStrong == QChar::DirL)) {
 654                         eor = current; status.eor = dirCurrent;
 655                     } else {
 656                         // numbers on both sides, neutrals get right to left direction
 657                         if(dir != QChar::DirL) {
 658                             appendItems(analysis, sor, eor, control, dir);
 659                             status.eor = QChar::DirON;
 660                             eor = current - 1;
 661                             dir = QChar::DirR;
 662                             appendItems(analysis, sor, eor, control, dir);
 663                             status.eor = QChar::DirAN;
 664                             dir = QChar::DirAN;
 665                         } else {
 666                             eor = current; status.eor = dirCurrent;
 667                         }
 668                     }
 669                 default:
 670                     break;
 671                 }
 672             break;
 673         case QChar::DirES:
 674         case QChar::DirCS:
 675             break;
 676         case QChar::DirET:
 677             if(status.last == QChar::DirEN) {
 678                 dirCurrent = QChar::DirEN;
 679                 eor = current; status.eor = dirCurrent;
 680             }
 681             break;
 682
 683             // boundary neutrals should be ignored
 684         case QChar::DirBN:
 685             break;
 686             // neutrals
 687         case QChar::DirB:
 688             // ### what do we do with newline and paragraph separators that come to here?
 689             break;
 690         case QChar::DirS:
 691             // ### implement rule L1
 692             break;
 693         case QChar::DirWS:
 694         case QChar::DirON:
 695             break;
 696         default:
 697             break;
 698         }
 699
 700         //qDebug() << "     after: dir=" << //        dir << " current=" << dirCurrent << " last=" << status.last << " eor=" << status.eor << " lastStrong=" << status.lastStrong << " embedding=" << control.direction();
 701
 702         if(current >= (int)length) break;
 703
 704         // set status.last as needed.
 705         switch(dirCurrent) {
 706         case QChar::DirET:
 707         case QChar::DirES:
 708         case QChar::DirCS:
 709         case QChar::DirS:
 710         case QChar::DirWS:
 711         case QChar::DirON:
 712             switch(status.last)
 713             {
 714             case QChar::DirL:
 715             case QChar::DirR:
 716             case QChar::DirAL:
 717             case QChar::DirEN:
 718             case QChar::DirAN:
 719                 status.last = dirCurrent;
 720                 break;
 721             default:
 722                 status.last = QChar::DirON;
 723             }
 724             break;
 725         case QChar::DirNSM:
 726         case QChar::DirBN:
 727             // ignore these
 728             break;
 729         case QChar::DirLRO:
 730         case QChar::DirLRE:
 731             status.last = QChar::DirL;
 732             break;
 733         case QChar::DirRLO:
 734         case QChar::DirRLE:
 735             status.last = QChar::DirR;
 736             break;
 737         case QChar::DirEN:
 738             if (status.last == QChar::DirL) {
 739                 status.last = QChar::DirL;
 740                 break;
 741             }
 742             // fall through
 743         default:
 744             status.last = dirCurrent;
 745         }
 746
 747         ++current;
 748     }
 749
 750 #if (BIDI_DEBUG >= 1)
 751     qDebug() << "reached end of line current=" << current << ", eor=" << eor;
 752 #endif
 753     eor = current - 1; // remove dummy char
 754
 755     if (sor <= eor)
 756         appendItems(analysis, sor, eor, control, dir);
 757
 758     return hasBidi;
 759 }
 760
 761 void QTextEngine::bidiReorder(int numItems, const quint8 *levels, int *visualOrder)
 762 {
 763
 764     // first find highest and lowest levels
 765     quint8 levelLow = 128;
 766     quint8 levelHigh = 0;
 767     int i = 0;
 768     while (i < numItems) {
 769         //printf("level = %d\n", r->level);
 770         if (levels[i] > levelHigh)
 771             levelHigh = levels[i];
 772         if (levels[i] < levelLow)
 773             levelLow = levels[i];
 774         i++;
 775     }
 776
 777     // implements reordering of the line (L2 according to BiDi spec):
 778     // L2. From the highest level found in the text to the lowest odd level on each line,
 779     // reverse any contiguous sequence of characters that are at that level or higher.
 780
 781     // reversing is only done up to the lowest odd level
 782     if(!(levelLow%2)) levelLow++;
 783
 784 #if (BIDI_DEBUG >= 1)
 785 //     qDebug() << "reorderLine: lineLow = " << (uint)levelLow << ", lineHigh = " << (uint)levelHigh;
 786 #endif
 787
 788     int count = numItems - 1;
 789     for (i = 0; i < numItems; i++)
 790         visualOrder[i] = i;
 791
 792     while(levelHigh >= levelLow) {
 793         int i = 0;
 794         while (i < count) {
 795             while(i < count && levels[i] < levelHigh) i++;
 796             int start = i;
 797             while(i <= count && levels[i] >= levelHigh) i++;
 798             int end = i-1;
 799
 800             if(start != end) {
 801                 //qDebug() << "reversing from " << start << " to " << end;
 802                 for(int j = 0; j < (end-start+1)/2; j++) {
 803                     int tmp = visualOrder[start+j];
 804                     visualOrder[start+j] = visualOrder[end-j];
 805                     visualOrder[end-j] = tmp;
 806                 }
 807             }
 808             i++;
 809         }
 810         levelHigh--;
 811     }
 812
 813 #if (BIDI_DEBUG >= 1)
 814 //     qDebug() << "visual order is:";
 815 //     for (i = 0; i < numItems; i++)
 816 //         qDebug() << visualOrder[i];
 817 #endif
 818 }
 819
 820 QT_BEGIN_INCLUDE_NAMESPACE
 821
 822 #if defined(Q_WS_X11) || defined (Q_WS_QWS)
 823 #   include "qfontengine_ft_p.h"
 824 #elif defined(Q_WS_MAC)
 825 # include "qtextengine_mac.cpp"
 826 #endif
 827
 828 #include <private/qharfbuzz_p.h>
 829
 830 QT_END_INCLUDE_NAMESPACE
 831
 832 // ask the font engine to find out which glyphs (as an index in the specific font) to use for the text in one item.
 833 static bool stringToGlyphs(HB_ShaperItem *item, QGlyphLayout *glyphs, QFontEngine *fontEngine)
 834 {
 835     int nGlyphs = item->num_glyphs;
 836
 837     QTextEngine::ShaperFlags shaperFlags(QTextEngine::GlyphIndicesOnly);
 838     if (item->item.bidiLevel % 2)
 839         shaperFlags |= QTextEngine::RightToLeft;
 840
 841     bool result = fontEngine->stringToCMap(reinterpret_cast<const QChar *>(item->string + item->item.pos), item->item.length, glyphs, &nGlyphs, shaperFlags);
 842     item->num_glyphs = nGlyphs;
 843     glyphs->numGlyphs = nGlyphs;
 844     return result;
 845 }
 846
 847 // shape all the items that intersect with the line, taking tab widths into account to find out what text actually fits in the line.
 848 void QTextEngine::shapeLine(const QScriptLine &line)
 849 {
 850     QFixed x;
 851     bool first = true;
 852     const int end = findItem(line.from + line.length - 1);
 853     int item = findItem(line.from);
 854     if (item == -1)
 855         return;
 856     for (item = findItem(line.from); item <= end; ++item) {
 857         QScriptItem &si = layoutData->items[item];
 858         if (si.analysis.flags == QScriptAnalysis::Tab) {
 859             ensureSpace(1);
 860             si.width = calculateTabWidth(item, x);
 861         } else {
 862             shape(item);
 863         }
 864         if (first && si.position != line.from) { // that means our x position has to be offset
 865             QGlyphLayout glyphs = shapedGlyphs(&si);
 866             Q_ASSERT(line.from > si.position);
 867             for (int i = line.from - si.position - 1; i >= 0; i--) {
 868                 x -= glyphs.effectiveAdvance(i);
 869             }
 870         }
 871         first = false;
 872
 873         x += si.width;
 874     }
 875 }
 876
 877 #if !defined(QT_ENABLE_HARFBUZZ_FOR_MAC) && defined(Q_WS_MAC)
 878 static bool enableHarfBuzz()
 879 {
 880     static enum { Yes, No, Unknown } status = Unknown;
 881
 882     if (status == Unknown) {
 883         QByteArray v = qgetenv("QT_ENABLE_HARFBUZZ");
 884         bool value = !v.isEmpty() && v != "0" && v != "false";
 885         if (value) status = Yes;
 886         else status = No;
 887     }
 888     return status == Yes;
 889 }
 890 #endif
 891
 892 void QTextEngine::shapeText(int item) const
 893 {
 894     Q_ASSERT(item < layoutData->items.size());
 895     QScriptItem &si = layoutData->items[item];
 896
 897     if (si.num_glyphs)
 898         return;
 899
 900 #if defined(Q_WS_MAC)
 901 #if !defined(QT_ENABLE_HARFBUZZ_FOR_MAC)
 902     if (enableHarfBuzz()) {
 903 #endif
 904         QFontEngine *actualFontEngine = fontEngine(si, &si.ascent, &si.descent, &si.leading);
 905         if (actualFontEngine->type() == QFontEngine::Multi)
 906             actualFontEngine = static_cast<QFontEngineMulti *>(actualFontEngine)->engine(0);
 907
 908         HB_Face face = actualFontEngine->harfbuzzFace();
 909         HB_Script script = (HB_Script) si.analysis.script;
 910         if (face->supported_scripts[script])
 911             shapeTextWithHarfbuzz(item);
 912         else
 913             shapeTextMac(item);
 914 #if !defined(QT_ENABLE_HARFBUZZ_FOR_MAC)
 915     } else {
 916         shapeTextMac(item);
 917     }
 918 #endif
 919 #elif defined(Q_WS_WINCE)
 920     shapeTextWithCE(item);
 921 #else
 922     shapeTextWithHarfbuzz(item);
 923 #endif
 924
 925     si.width = 0;
 926
 927     if (!si.num_glyphs)
 928         return;
 929     QGlyphLayout glyphs = shapedGlyphs(&si);
 930
 931     QFont font = this->font(si);
 932     bool letterSpacingIsAbsolute = font.d->letterSpacingIsAbsolute;
 933     QFixed letterSpacing = font.d->letterSpacing;
 934     QFixed wordSpacing = font.d->wordSpacing;
 935
 936     if (letterSpacingIsAbsolute && letterSpacing.value())
 937         letterSpacing *= font.d->dpi / qt_defaultDpiY();
 938
 939     if (letterSpacing != 0) {
 940         for (int i = 1; i < si.num_glyphs; ++i) {
 941             if (glyphs.attributes[i].clusterStart) {
 942                 if (letterSpacingIsAbsolute)
 943                     glyphs.advances_x[i-1] += letterSpacing;
 944                 else {
 945                     QFixed &advance = glyphs.advances_x[i-1];
 946                     advance += (letterSpacing - 100) * advance / 100;
 947                 }
 948             }
 949         }
 950         if (letterSpacingIsAbsolute)
 951             glyphs.advances_x[si.num_glyphs-1] += letterSpacing;
 952         else {
 953             QFixed &advance = glyphs.advances_x[si.num_glyphs-1];
 954             advance += (letterSpacing - 100) * advance / 100;
 955         }
 956     }
 957     if (wordSpacing != 0) {
 958         for (int i = 0; i < si.num_glyphs; ++i) {
 959             if (glyphs.attributes[i].justification == HB_Space
 960                 || glyphs.attributes[i].justification == HB_Arabic_Space) {
 961                 // word spacing only gets added once to a consecutive run of spaces (see CSS spec)
 962                 if (i + 1 == si.num_glyphs
 963                     ||(glyphs.attributes[i+1].justification != HB_Space
 964                        && glyphs.attributes[i+1].justification != HB_Arabic_Space))
 965                     glyphs.advances_x[i] += wordSpacing;
 966             }
 967         }
 968     }
 969
 970     for (int i = 0; i < si.num_glyphs; ++i)
 971         si.width += glyphs.advances_x[i] * !glyphs.attributes[i].dontPrint;
 972 }
 973
 974 static inline bool hasCaseChange(const QScriptItem &si)
 975 {
 976     return si.analysis.flags == QScriptAnalysis::SmallCaps ||
 977            si.analysis.flags == QScriptAnalysis::Uppercase ||
 978            si.analysis.flags == QScriptAnalysis::Lowercase;
 979 }
 980
 981 #if defined(Q_WS_WINCE) //TODO
 982 // set the glyph attributes heuristically. Assumes a 1 to 1 relationship between chars and glyphs
 983 // and no reordering.
 984 // also computes logClusters heuristically
 985 static void heuristicSetGlyphAttributes(const QChar *uc, int length, QGlyphLayout *glyphs, unsigned short *logClusters, int num_glyphs)
 986 {
 987     // ### zeroWidth and justification are missing here!!!!!
 988
 989     Q_UNUSED(num_glyphs);
 990     Q_ASSERT(num_glyphs <= length);
 991
 992 //     qDebug("QScriptEngine::heuristicSetGlyphAttributes, num_glyphs=%d", item->num_glyphs);
 993
 994     int glyph_pos = 0;
 995     for (int i = 0; i < length; i++) {
 996         if (uc[i].isHighSurrogate() && i < length-1 && uc[i+1].isLowSurrogate()) {
 997             logClusters[i] = glyph_pos;
 998             logClusters[++i] = glyph_pos;
 999         } else {
1000             logClusters[i] = glyph_pos;
1001         }
1002         ++glyph_pos;
1003     }
1004
1005     // first char in a run is never (treated as) a mark
1006     int cStart = 0;
1007
1008     const bool symbolFont = false; // ####
1009     glyphs->attributes[0].mark = false;
1010     glyphs->attributes[0].clusterStart = true;
1011     glyphs->attributes[0].dontPrint = (!symbolFont && uc[0].unicode() == 0x00ad) || qIsControlChar(uc[0].unicode());
1012
1013     int pos = 0;
1014     int lastCat = QChar::category(uc[0].unicode());
1015     for (int i = 1; i < length; ++i) {
1016         if (logClusters[i] == pos)
1017             // same glyph
1018             continue;
1019         ++pos;
1020         while (pos < logClusters[i]) {
1021             glyphs[pos].attributes = glyphs[pos-1].attributes;
1022             ++pos;
1023         }
1024         // hide soft-hyphens by default
1025         if ((!symbolFont && uc[i].unicode() == 0x00ad) || qIsControlChar(uc[i].unicode()))
1026             glyphs->attributes[pos].dontPrint = true;
1027         const QUnicodeTables::Properties *prop = QUnicodeTables::properties(uc[i].unicode());
1028         int cat = prop->category;
1029         if (cat != QChar::Mark_NonSpacing) {
1030             glyphs->attributes[pos].mark = false;
1031             glyphs->attributes[pos].clusterStart = true;
1032             glyphs->attributes[pos].combiningClass = 0;
1033             cStart = logClusters[i];
1034         } else {
1035             int cmb = prop->combiningClass;
1036
1037             if (cmb == 0) {
1038                 // Fix 0 combining classes
1039                 if ((uc[pos].unicode() & 0xff00) == 0x0e00) {
1040                     // thai or lao
1041                     unsigned char col = uc[pos].cell();
1042                     if (col == 0x31 ||
1043                          col == 0x34 ||
1044                          col == 0x35 ||
1045                          col == 0x36 ||
1046                          col == 0x37 ||
1047                          col == 0x47 ||
1048                          col == 0x4c ||
1049                          col == 0x4d ||
1050                          col == 0x4e) {
1051                         cmb = QChar::Combining_AboveRight;
1052                     } else if (col == 0xb1 ||
1053                                 col == 0xb4 ||
1054                                 col == 0xb5 ||
1055                                 col == 0xb6 ||
1056                                 col == 0xb7 ||
1057                                 col == 0xbb ||
1058                                 col == 0xcc ||
1059                                 col == 0xcd) {
1060                         cmb = QChar::Combining_Above;
1061                     } else if (col == 0xbc) {
1062                         cmb = QChar::Combining_Below;
1063                     }
1064                 }
1065             }
1066
1067             glyphs->attributes[pos].mark = true;
1068             glyphs->attributes[pos].clusterStart = false;
1069             glyphs->attributes[pos].combiningClass = cmb;
1070             logClusters[i] = cStart;
1071             glyphs->advances_x[pos] = 0;
1072             glyphs->advances_y[pos] = 0;
1073         }
1074
1075         // one gets an inter character justification point if the current char is not a non spacing mark.
1076         // as then the current char belongs to the last one and one gets a space justification point
1077         // after the space char.
1078         if (lastCat == QChar::Separator_Space)
1079             glyphs->attributes[pos-1].justification = HB_Space;
1080         else if (cat != QChar::Mark_NonSpacing)
1081             glyphs->attributes[pos-1].justification = HB_Character;
1082         else
1083             glyphs->attributes[pos-1].justification = HB_NoJustification;
1084
1085         lastCat = cat;
1086     }
1087     pos = logClusters[length-1];
1088     if (lastCat == QChar::Separator_Space)
1089         glyphs->attributes[pos].justification = HB_Space;
1090     else
1091         glyphs->attributes[pos].justification = HB_Character;
1092 }
1093
1094 void QTextEngine::shapeTextWithCE(int item) const
1095 {
1096     QScriptItem &si = layoutData->items[item];
1097     si.glyph_data_offset = layoutData->used;
1098
1099     QFontEngine *fe = fontEngine(si, &si.ascent, &si.descent, &si.leading);
1100
1101     QTextEngine::ShaperFlags flags;
1102     if (si.analysis.bidiLevel % 2)
1103         flags |= RightToLeft;
1104     if (option.useDesignMetrics())
1105         flags |= DesignMetrics;
1106
1107     // pre-initialize char attributes
1108     if (! attributes())
1109         return;
1110
1111     const int len = length(item);
1112     int num_glyphs = length(item);
1113     const QChar *str = layoutData->string.unicode() + si.position;
1114     ushort upperCased[256];
1115     if (hasCaseChange(si)) {
1116         ushort *uc = upperCased;
1117         if (len > 256)
1118             uc = new ushort[len];
1119         for (int i = 0; i < len; ++i) {
1120             if(si.analysis.flags == QScriptAnalysis::Lowercase)
1121                 uc[i] = str[i].toLower().unicode();
1122             else
1123                 uc[i] = str[i].toUpper().unicode();
1124         }
1125         str = reinterpret_cast<const QChar *>(uc);
1126     }
1127
1128     while (true) {
1129         if (! ensureSpace(num_glyphs)) {
1130             // If str is converted to uppercase/lowercase form with a new buffer,
1131             // we need to delete that buffer before return for error
1132             const ushort *uc = reinterpret_cast<const ushort *>(str);
1133             if (hasCaseChange(si) && uc != upperCased)
1134                 delete [] uc;
1135             return;
1136         }
1137         num_glyphs = layoutData->glyphLayout.numGlyphs - layoutData->used;
1138
1139         QGlyphLayout g = availableGlyphs(&si);
1140         unsigned short *log_clusters = logClusters(&si);
1141
1142         if (fe->stringToCMap(str,
1143                              len,
1144                              &g,
1145                              &num_glyphs,
1146                              flags)) {
1147             heuristicSetGlyphAttributes(str, len, &g, log_clusters, num_glyphs);
1148                     break;
1149         }
1150     }
1151
1152     si.num_glyphs = num_glyphs;
1153
1154     layoutData->used += si.num_glyphs;
1155
1156     const ushort *uc = reinterpret_cast<const ushort *>(str);
1157     if (hasCaseChange(si) && uc != upperCased)
1158         delete [] uc;
1159 }
1160 #endif
1161
1162 static inline void moveGlyphData(const QGlyphLayout &destination, const QGlyphLayout &source, int num)
1163 {
1164     if (num > 0 && destination.glyphs != source.glyphs) {
1165         memmove(destination.glyphs, source.glyphs, num * sizeof(HB_Glyph));
1166         memmove(destination.attributes, source.attributes, num * sizeof(HB_GlyphAttributes));
1167         memmove(destination.advances_x, source.advances_x, num * sizeof(HB_Fixed));
1168         memmove(destination.offsets, source.offsets, num * sizeof(HB_FixedPoint));
1169     }
1170 }
1171
1172 /// take the item from layoutData->items and
1173 void QTextEngine::shapeTextWithHarfbuzz(int item) const
1174 {
1175     Q_ASSERT(sizeof(HB_Fixed) == sizeof(QFixed));
1176     Q_ASSERT(sizeof(HB_FixedPoint) == sizeof(QFixedPoint));
1177
1178     QScriptItem &si = layoutData->items[item];
1179
1180     si.glyph_data_offset = layoutData->used;
1181
1182     QFontEngine *font = fontEngine(si, &si.ascent, &si.descent, &si.leading);
1183
1184     bool kerningEnabled = this->font(si).d->kerning;
1185
1186     HB_ShaperItem entire_shaper_item;
1187     qMemSet(&entire_shaper_item, 0, sizeof(entire_shaper_item));
1188     entire_shaper_item.string = reinterpret_cast<const HB_UChar16 *>(layoutData->string.constData());
1189     entire_shaper_item.stringLength = layoutData->string.length();
1190     entire_shaper_item.item.script = (HB_Script)si.analysis.script;
1191     entire_shaper_item.item.pos = si.position;
1192     entire_shaper_item.item.length = length(item);
1193     entire_shaper_item.item.bidiLevel = si.analysis.bidiLevel;
1194
1195     HB_UChar16 upperCased[256]; // XXX what about making this 4096, so we don't have to extend it ever.
1196     if (hasCaseChange(si)) {
1197         HB_UChar16 *uc = upperCased;
1198         if (entire_shaper_item.item.length > 256)
1199             uc = new HB_UChar16[entire_shaper_item.item.length];
1200         for (uint i = 0; i < entire_shaper_item.item.length; ++i) {
1201             if(si.analysis.flags == QScriptAnalysis::Lowercase)
1202                 uc[i] = QChar::toLower(entire_shaper_item.string[si.position + i]);
1203             else
1204                 uc[i] = QChar::toUpper(entire_shaper_item.string[si.position + i]);
1205         }
1206         entire_shaper_item.item.pos = 0;
1207         entire_shaper_item.string = uc;
1208         entire_shaper_item.stringLength = entire_shaper_item.item.length;
1209     }
1210
1211     entire_shaper_item.shaperFlags = 0;
1212     if (!kerningEnabled)
1213         entire_shaper_item.shaperFlags |= HB_ShaperFlag_NoKerning;
1214     if (option.useDesignMetrics())
1215         entire_shaper_item.shaperFlags |= HB_ShaperFlag_UseDesignMetrics;
1216
1217     entire_shaper_item.num_glyphs = qMax(layoutData->glyphLayout.numGlyphs - layoutData->used, int(entire_shaper_item.item.length));
1218     if (! ensureSpace(entire_shaper_item.num_glyphs)) {
1219         if (hasCaseChange(si))
1220             delete [] const_cast<HB_UChar16 *>(entire_shaper_item.string);
1221         return;
1222     }
1223     QGlyphLayout initialGlyphs = availableGlyphs(&si).mid(0, entire_shaper_item.num_glyphs);
1224
1225     if (!stringToGlyphs(&entire_shaper_item, &initialGlyphs, font)) {
1226         if (! ensureSpace(entire_shaper_item.num_glyphs)) {
1227             if (hasCaseChange(si))
1228                 delete [] const_cast<HB_UChar16 *>(entire_shaper_item.string);
1229             return;
1230         }
1231         initialGlyphs = availableGlyphs(&si).mid(0, entire_shaper_item.num_glyphs);
1232
1233         if (!stringToGlyphs(&entire_shaper_item, &initialGlyphs, font)) {
1234             // ############ if this happens there's a bug in the fontengine
1235             if (hasCaseChange(si) && entire_shaper_item.string != upperCased)
1236                 delete [] const_cast<HB_UChar16 *>(entire_shaper_item.string);
1237             return;
1238         }
1239     }
1240
1241     // split up the item into parts that come from different font engines.
1242     QVarLengthArray<int> itemBoundaries(2);
1243     // k * 2 entries, array[k] == index in string, array[k + 1] == index in glyphs
1244     itemBoundaries[0] = entire_shaper_item.item.pos;
1245     itemBoundaries[1] = 0;
1246
1247     if (font->type() == QFontEngine::Multi) {
1248         uint lastEngine = 0;
1249         int charIdx = entire_shaper_item.item.pos;
1250         const int stringEnd = charIdx + entire_shaper_item.item.length;
1251         for (quint32 i = 0; i < entire_shaper_item.num_glyphs; ++i, ++charIdx) {
1252             uint engineIdx = initialGlyphs.glyphs[i] >> 24;
1253             if (engineIdx != lastEngine && i > 0) {
1254                 itemBoundaries.append(charIdx);
1255                 itemBoundaries.append(i);
1256             }
1257             lastEngine = engineIdx;
1258             if (HB_IsHighSurrogate(entire_shaper_item.string[charIdx])
1259                 && charIdx < stringEnd - 1
1260                 && HB_IsLowSurrogate(entire_shaper_item.string[charIdx + 1]))
1261                 ++charIdx;
1262         }
1263     }
1264
1265
1266
1267     int remaining_glyphs = entire_shaper_item.num_glyphs;
1268     int glyph_pos = 0;
1269     // for each item shape using harfbuzz and store the results in our layoutData's glyphs array.
1270     for (int k = 0; k < itemBoundaries.size(); k += 2) { // for the +2, see the comment at the definition of itemBoundaries
1271
1272         HB_ShaperItem shaper_item = entire_shaper_item;
1273
1274         shaper_item.item.pos = itemBoundaries[k];
1275         if (k < itemBoundaries.size() - 3) {
1276             shaper_item.item.length = itemBoundaries[k + 2] - shaper_item.item.pos;
1277             shaper_item.num_glyphs = itemBoundaries[k + 3] - itemBoundaries[k + 1];
1278         } else { // last combo in the list, avoid out of bounds access.
1279             shaper_item.item.length -= shaper_item.item.pos - entire_shaper_item.item.pos;
1280             shaper_item.num_glyphs -= itemBoundaries[k + 1];
1281         }
1282         shaper_item.initialGlyphCount = shaper_item.num_glyphs;
1283         if (shaper_item.num_glyphs < shaper_item.item.length)
1284             shaper_item.num_glyphs = shaper_item.item.length;
1285
1286         QFontEngine *actualFontEngine = font;
1287         uint engineIdx = 0;
1288         if (font->type() == QFontEngine::Multi) {
1289             engineIdx = uint(availableGlyphs(&si).glyphs[glyph_pos] >> 24);
1290
1291             actualFontEngine = static_cast<QFontEngineMulti *>(font)->engine(engineIdx);
1292         }
1293
1294         si.ascent = qMax(actualFontEngine->ascent(), si.ascent);
1295         si.descent = qMax(actualFontEngine->descent(), si.descent);
1296         si.leading = qMax(actualFontEngine->leading(), si.leading);
1297
1298         shaper_item.font = actualFontEngine->harfbuzzFont();
1299         shaper_item.face = actualFontEngine->harfbuzzFace();
1300
1301         shaper_item.glyphIndicesPresent = true;
1302
1303         remaining_glyphs -= shaper_item.initialGlyphCount;
1304
1305         do {
1306             if (! ensureSpace(glyph_pos + shaper_item.num_glyphs + remaining_glyphs)) {
1307                 if (hasCaseChange(si))
1308                     delete [] const_cast<HB_UChar16 *>(entire_shaper_item.string);
1309                 return;
1310             }
1311
1312             const QGlyphLayout g = availableGlyphs(&si).mid(glyph_pos);
1313             if (shaper_item.num_glyphs > shaper_item.item.length)
1314                 moveGlyphData(g.mid(shaper_item.num_glyphs), g.mid(shaper_item.initialGlyphCount), remaining_glyphs);
1315
1316             shaper_item.glyphs = g.glyphs;
1317             shaper_item.attributes = g.attributes;
1318             shaper_item.advances = reinterpret_cast<HB_Fixed *>(g.advances_x);
1319             shaper_item.offsets = reinterpret_cast<HB_FixedPoint *>(g.offsets);
1320
1321             if (shaper_item.glyphIndicesPresent) {
1322                 for (hb_uint32 i = 0; i < shaper_item.initialGlyphCount; ++i)
1323                     shaper_item.glyphs[i] &= 0x00ffffff;
1324             }
1325
1326             shaper_item.log_clusters = logClusters(&si) + shaper_item.item.pos - entire_shaper_item.item.pos;
1327
1328 //          qDebug("    .. num_glyphs=%d, used=%d, item.num_glyphs=%d", num_glyphs, used, shaper_item.num_glyphs);
1329         } while (!qShapeItem(&shaper_item)); // this does the actual shaping via harfbuzz.
1330
1331         QGlyphLayout g = availableGlyphs(&si).mid(glyph_pos, shaper_item.num_glyphs);
1332         moveGlyphData(g.mid(shaper_item.num_glyphs), g.mid(shaper_item.initialGlyphCount), remaining_glyphs);
1333
1334         for (hb_uint32 i = 0; i < shaper_item.num_glyphs; ++i)
1335             g.glyphs[i] = g.glyphs[i] | (engineIdx << 24);
1336
1337         for (hb_uint32 i = 0; i < shaper_item.item.length; ++i)
1338             shaper_item.log_clusters[i] += glyph_pos;
1339
1340         if (kerningEnabled && !shaper_item.kerning_applied)
1341             font->doKerning(&g, option.useDesignMetrics() ? QFlag(QTextEngine::DesignMetrics) : QFlag(0));
1342
1343         glyph_pos += shaper_item.num_glyphs;
1344     }
1345
1346 //     qDebug("    -> item: script=%d num_glyphs=%d", shaper_item.script, shaper_item.num_glyphs);
1347     si.num_glyphs = glyph_pos;
1348
1349     layoutData->used += si.num_glyphs;
1350
1351     if (hasCaseChange(si) && entire_shaper_item.string != upperCased)
1352         delete [] const_cast<HB_UChar16 *>(entire_shaper_item.string);
1353 }
1354
1355 static void init(QTextEngine *e)
1356 {
1357     e->ignoreBidi = false;
1358     e->cacheGlyphs = false;
1359     e->forceJustification = false;
1360     e->visualMovement = false;
1361
1362     e->layoutData = 0;
1363
1364     e->minWidth = 0;
1365     e->maxWidth = 0;
1366
1367     e->underlinePositions = 0;
1368     e->specialData = 0;
1369     e->stackEngine = false;
1370 }
1371
1372 QTextEngine::QTextEngine()
1373 {
1374     init(this);
1375 }
1376
1377 QTextEngine::QTextEngine(const QString &str, const QFont &f)
1378     : text(str),
1379       fnt(f)
1380 {
1381     init(this);
1382 }
1383
1384 QTextEngine::~QTextEngine()
1385 {
1386     if (!stackEngine)
1387         delete layoutData;
1388     delete specialData;
1389 }
1390
1391 const HB_CharAttributes *QTextEngine::attributes() const
1392 {
1393     if (layoutData && layoutData->haveCharAttributes)
1394         return (HB_CharAttributes *) layoutData->memory;
1395
1396     itemize();
1397     if (! ensureSpace(layoutData->string.length()))
1398         return NULL;
1399
1400     QVarLengthArray<HB_ScriptItem> hbScriptItems(layoutData->items.size());
1401
1402     for (int i = 0; i < layoutData->items.size(); ++i) {
1403         const QScriptItem &si = layoutData->items[i];
1404         hbScriptItems[i].pos = si.position;
1405         hbScriptItems[i].length = length(i);
1406         hbScriptItems[i].bidiLevel = si.analysis.bidiLevel;
1407         hbScriptItems[i].script = (HB_Script)si.analysis.script;
1408     }
1409
1410     qGetCharAttributes(reinterpret_cast<const HB_UChar16 *>(layoutData->string.constData()),
1411                        layoutData->string.length(),
1412                        hbScriptItems.data(), hbScriptItems.size(),
1413                        (HB_CharAttributes *)layoutData->memory);
1414
1415
1416     layoutData->haveCharAttributes = true;
1417     return (HB_CharAttributes *) layoutData->memory;
1418 }
1419
1420 void QTextEngine::shape(int item) const
1421 {
1422     if (layoutData->items[item].analysis.flags == QScriptAnalysis::Object) {
1423         ensureSpace(1);
1424         if (block.docHandle()) {
1425             QTextFormat format = formats()->format(formatIndex(&layoutData->items[item]));
1426             docLayout()->resizeInlineObject(QTextInlineObject(item, const_cast<QTextEngine *>(this)),
1427                                             layoutData->items[item].position + block.position(), format);
1428         }
1429     } else if (layoutData->items[item].analysis.flags == QScriptAnalysis::Tab) {
1430         // set up at least the ascent/descent/leading of the script item for the tab
1431         fontEngine(layoutData->items[item],
1432                    &layoutData->items[item].ascent,
1433                    &layoutData->items[item].descent,
1434                    &layoutData->items[item].leading);
1435     } else {
1436         shapeText(item);
1437     }
1438 }
1439
1440 static inline void releaseCachedFontEngine(QFontEngine *fontEngine)
1441 {
1442     if (fontEngine) {
1443         fontEngine->ref.deref();
1444         if (fontEngine->cache_count == 0 && fontEngine->ref == 0)
1445             delete fontEngine;
1446     }
1447 }
1448
1449 void QTextEngine::invalidate()
1450 {
1451     freeMemory();
1452     minWidth = 0;
1453     maxWidth = 0;
1454     if (specialData)
1455         specialData->resolvedFormatIndices.clear();
1456
1457     releaseCachedFontEngine(feCache.prevFontEngine);
1458     releaseCachedFontEngine(feCache.prevScaledFontEngine);
1459     feCache.reset();
1460 }
1461
1462 void QTextEngine::clearLineData()
1463 {
1464     lines.clear();
1465 }
1466
1467 void QTextEngine::validate() const
1468 {
1469     if (layoutData)
1470         return;
1471     layoutData = new LayoutData();
1472     if (block.docHandle()) {
1473         layoutData->string = block.text();
1474         if (option.flags() & QTextOption::ShowLineAndParagraphSeparators)
1475             layoutData->string += QLatin1Char(block.next().isValid() ? 0xb6 : 0x20);
1476     } else {
1477         layoutData->string = text;
1478     }
1479     if (specialData && specialData->preeditPosition != -1)
1480         layoutData->string.insert(specialData->preeditPosition, specialData->preeditText);
1481 }
1482
1483 void QTextEngine::itemize() const
1484 {
1485     validate();
1486     if (layoutData->items.size())
1487         return;
1488
1489     int length = layoutData->string.length();
1490     if (!length)
1491         return;
1492 #if defined(Q_WS_MAC) && !defined(QT_MAC_USE_COCOA)
1493     // ATSUI requires RTL flags to correctly identify the character stops.
1494     bool ignore = false;
1495 #else
1496     bool ignore = ignoreBidi;
1497 #endif
1498
1499     bool rtl = isRightToLeft();
1500
1501     if (!ignore && !rtl) {
1502         ignore = true;
1503         const QChar *start = layoutData->string.unicode();
1504         const QChar * const end = start + length;
1505         while (start < end) {
1506             if (start->unicode() >= 0x590) {
1507                 ignore = false;
1508                 break;
1509             }
1510             ++start;
1511         }
1512     }
1513
1514     QVarLengthArray<QScriptAnalysis, 4096> scriptAnalysis(length);
1515     QScriptAnalysis *analysis = scriptAnalysis.data();
1516
1517     QBidiControl control(rtl);
1518
1519     if (ignore) {
1520         memset(analysis, 0, length*sizeof(QScriptAnalysis));
1521         if (option.textDirection() == Qt::RightToLeft) {
1522             for (int i = 0; i < length; ++i)
1523                 analysis[i].bidiLevel = 1;
1524             layoutData->hasBidi = true;
1525         }
1526     } else {
1527         layoutData->hasBidi = bidiItemize(const_cast<QTextEngine *>(this), analysis, control);
1528     }
1529
1530     const ushort *uc = reinterpret_cast<const ushort *>(layoutData->string.unicode());
1531     const ushort *e = uc + length;
1532     int lastScript = QUnicodeTables::Common;
1533     while (uc < e) {
1534         switch (*uc) {
1535         case QChar::ObjectReplacementCharacter:
1536             analysis->script = QUnicodeTables::Common;
1537             analysis->flags = QScriptAnalysis::Object;
1538             break;
1539         case QChar::LineSeparator:
1540             if (analysis->bidiLevel % 2)
1541                 --analysis->bidiLevel;
1542             analysis->script = QUnicodeTables::Common;
1543             analysis->flags = QScriptAnalysis::LineOrParagraphSeparator;
1544             if (option.flags() & QTextOption::ShowLineAndParagraphSeparators)
1545                 *const_cast<ushort*>(uc) = 0x21B5; // visual line separator
1546             break;
1547         case 9: // Tab
1548             analysis->script = QUnicodeTables::Common;
1549             analysis->flags = QScriptAnalysis::Tab;
1550             analysis->bidiLevel = control.baseLevel();
1551             break;
1552         case 32: // Space
1553         case QChar::Nbsp:
1554             if (option.flags() & QTextOption::ShowTabsAndSpaces) {
1555                 analysis->script = QUnicodeTables::Common;
1556                 analysis->flags = QScriptAnalysis::Space;
1557                 analysis->bidiLevel = control.baseLevel();
1558                 break;
1559             }
1560         // fall through
1561         default:
1562             int script = QUnicodeTables::script(*uc);
1563             analysis->script = script == QUnicodeTables::Inherited ? lastScript : script;
1564             analysis->flags = QScriptAnalysis::None;
1565             break;
1566         }
1567         lastScript = analysis->script;
1568         ++uc;
1569         ++analysis;
1570     }
1571     if (option.flags() & QTextOption::ShowLineAndParagraphSeparators) {
1572         (analysis-1)->flags = QScriptAnalysis::LineOrParagraphSeparator; // to exclude it from width
1573     }
1574
1575     Itemizer itemizer(layoutData->string, scriptAnalysis.data(), layoutData->items);
1576
1577     const QTextDocumentPrivate *p = block.docHandle();
1578     if (p) {
1579         SpecialData *s = specialData;
1580
1581         QTextDocumentPrivate::FragmentIterator it = p->find(block.position());
1582         QTextDocumentPrivate::FragmentIterator end = p->find(block.position() + block.length() - 1); // -1 to omit the block separator char
1583         int format = it.value()->format;
1584
1585         int prevPosition = 0;
1586         int position = prevPosition;
1587         while (1) {
1588             const QTextFragmentData * const frag = it.value();
1589             if (it == end || format != frag->format) {
1590                 if (s && position >= s->preeditPosition) {
1591                     position += s->preeditText.length();
1592                     s = 0;
1593                 }
1594                 Q_ASSERT(position <= length);
1595                 itemizer.generate(prevPosition, position - prevPosition,
1596                     formats()->charFormat(format).fontCapitalization());
1597                 if (it == end) {
1598                     if (position < length)
1599                         itemizer.generate(position, length - position,
1600                                           formats()->charFormat(format).fontCapitalization());
1601                     break;
1602                 }
1603                 format = frag->format;
1604                 prevPosition = position;
1605             }
1606             position += frag->size_array[0];
1607             ++it;
1608         }
1609     } else {
1610         itemizer.generate(0, length, static_cast<QFont::Capitalization> (fnt.d->capital));
1611     }
1612
1613     addRequiredBoundaries();
1614     resolveAdditionalFormats();
1615 }
1616
1617 bool QTextEngine::isRightToLeft() const
1618 {
1619     switch (option.textDirection()) {
1620     case Qt::LeftToRight:
1621         return false;
1622     case Qt::RightToLeft:
1623         return true;
1624     default:
1625         break;
1626     }
1627     if (!layoutData)
1628         itemize();
1629     // this places the cursor in the right position depending on the keyboard layout
1630     if (layoutData->string.isEmpty())
1631         return QGuiApplication::keyboardInputDirection() == Qt::RightToLeft;
1632     return layoutData->string.isRightToLeft();
1633 }
1634
1635
1636 int QTextEngine::findItem(int strPos) const
1637 {
1638     itemize();
1639     int left = 1;
1640     int right = layoutData->items.size()-1;
1641     while(left <= right) {
1642         int middle = ((right-left)/2)+left;
1643         if (strPos > layoutData->items[middle].position)
1644             left = middle+1;
1645         else if(strPos < layoutData->items[middle].position)
1646             right = middle-1;
1647         else {
1648             return middle;
1649         }
1650     }
1651     return right;
1652 }
1653
1654 QFixed QTextEngine::width(int from, int len) const
1655 {
1656     itemize();
1657
1658     QFixed w = 0;
1659
1660 //     qDebug("QTextEngine::width(from = %d, len = %d), numItems=%d, strleng=%d", from,  len, items.size(), string.length());
1661     for (int i = 0; i < layoutData->items.size(); i++) {
1662         const QScriptItem *si = layoutData->items.constData() + i;
1663         int pos = si->position;
1664         int ilen = length(i);
1665 //          qDebug("item %d: from %d len %d", i, pos, ilen);
1666         if (pos >= from + len)
1667             break;
1668         if (pos + ilen > from) {
1669             if (!si->num_glyphs)
1670                 shape(i);
1671
1672             if (si->analysis.flags == QScriptAnalysis::Object) {
1673                 w += si->width;
1674                 continue;
1675             } else if (si->analysis.flags == QScriptAnalysis::Tab) {
1676                 w += calculateTabWidth(i, w);
1677                 continue;
1678             }
1679
1680
1681             QGlyphLayout glyphs = shapedGlyphs(si);
1682             unsigned short *logClusters = this->logClusters(si);
1683
1684 //             fprintf(stderr, "  logclusters:");
1685 //             for (int k = 0; k < ilen; k++)
1686 //                 fprintf(stderr, " %d", logClusters[k]);
1687 //             fprintf(stderr, "\n");
1688             // do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
1689             int charFrom = from - pos;
1690             if (charFrom < 0)
1691                 charFrom = 0;
1692             int glyphStart = logClusters[charFrom];
1693             if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
1694                 while (charFrom < ilen && logClusters[charFrom] == glyphStart)
1695                     charFrom++;
1696             if (charFrom < ilen) {
1697                 glyphStart = logClusters[charFrom];
1698                 int charEnd = from + len - 1 - pos;
1699                 if (charEnd >= ilen)
1700                     charEnd = ilen-1;
1701                 int glyphEnd = logClusters[charEnd];
1702                 while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
1703                     charEnd++;
1704                 glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
1705
1706 //                 qDebug("char: start=%d end=%d / glyph: start = %d, end = %d", charFrom, charEnd, glyphStart, glyphEnd);
1707                 for (int i = glyphStart; i < glyphEnd; i++)
1708                     w += glyphs.advances_x[i] * !glyphs.attributes[i].dontPrint;
1709             }
1710         }
1711     }
1712 //     qDebug("   --> w= %d ", w);
1713     return w;
1714 }
1715
1716 glyph_metrics_t QTextEngine::boundingBox(int from,  int len) const
1717 {
1718     itemize();
1719
1720     glyph_metrics_t gm;
1721
1722     for (int i = 0; i < layoutData->items.size(); i++) {
1723         const QScriptItem *si = layoutData->items.constData() + i;
1724
1725         int pos = si->position;
1726         int ilen = length(i);
1727         if (pos > from + len)
1728             break;
1729         if (pos + ilen > from) {
1730             if (!si->num_glyphs)
1731                 shape(i);
1732
1733             if (si->analysis.flags == QScriptAnalysis::Object) {
1734                 gm.width += si->width;
1735                 continue;
1736             } else if (si->analysis.flags == QScriptAnalysis::Tab) {
1737                 gm.width += calculateTabWidth(i, gm.width);
1738                 continue;
1739             }
1740
1741             unsigned short *logClusters = this->logClusters(si);
1742             QGlyphLayout glyphs = shapedGlyphs(si);
1743
1744             // do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
1745             int charFrom = from - pos;
1746             if (charFrom < 0)
1747                 charFrom = 0;
1748             int glyphStart = logClusters[charFrom];
1749             if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
1750                 while (charFrom < ilen && logClusters[charFrom] == glyphStart)
1751                     charFrom++;
1752             if (charFrom < ilen) {
1753                 QFontEngine *fe = fontEngine(*si);
1754                 glyphStart = logClusters[charFrom];
1755                 int charEnd = from + len - 1 - pos;
1756                 if (charEnd >= ilen)
1757                     charEnd = ilen-1;
1758                 int glyphEnd = logClusters[charEnd];
1759                 while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
1760                     charEnd++;
1761                 glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
1762                 if (glyphStart <= glyphEnd ) {
1763                     glyph_metrics_t m = fe->boundingBox(glyphs.mid(glyphStart, glyphEnd - glyphStart));
1764                     gm.x = qMin(gm.x, m.x + gm.xoff);
1765                     gm.y = qMin(gm.y, m.y + gm.yoff);
1766                     gm.width = qMax(gm.width, m.width+gm.xoff);
1767                     gm.height = qMax(gm.height, m.height+gm.yoff);
1768                     gm.xoff += m.xoff;
1769                     gm.yoff += m.yoff;
1770                 }
1771             }
1772         }
1773     }
1774     return gm;
1775 }
1776
1777 glyph_metrics_t QTextEngine::tightBoundingBox(int from,  int len) const
1778 {
1779     itemize();
1780
1781     glyph_metrics_t gm;
1782
1783     for (int i = 0; i < layoutData->items.size(); i++) {
1784         const QScriptItem *si = layoutData->items.constData() + i;
1785         int pos = si->position;
1786         int ilen = length(i);
1787         if (pos > from + len)
1788             break;
1789         if (pos + len > from) {
1790             if (!si->num_glyphs)
1791                 shape(i);
1792             unsigned short *logClusters = this->logClusters(si);
1793             QGlyphLayout glyphs = shapedGlyphs(si);
1794
1795             // do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
1796             int charFrom = from - pos;
1797             if (charFrom < 0)
1798                 charFrom = 0;
1799             int glyphStart = logClusters[charFrom];
1800             if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
1801                 while (charFrom < ilen && logClusters[charFrom] == glyphStart)
1802                     charFrom++;
1803             if (charFrom < ilen) {
1804                 glyphStart = logClusters[charFrom];
1805                 int charEnd = from + len - 1 - pos;
1806                 if (charEnd >= ilen)
1807                     charEnd = ilen-1;
1808                 int glyphEnd = logClusters[charEnd];
1809                 while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
1810                     charEnd++;
1811                 glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
1812                 if (glyphStart <= glyphEnd ) {
1813                     QFontEngine *fe = fontEngine(*si);
1814                     glyph_metrics_t m = fe->tightBoundingBox(glyphs.mid(glyphStart, glyphEnd - glyphStart));
1815                     gm.x = qMin(gm.x, m.x + gm.xoff);
1816                     gm.y = qMin(gm.y, m.y + gm.yoff);
1817                     gm.width = qMax(gm.width, m.width+gm.xoff);
1818                     gm.height = qMax(gm.height, m.height+gm.yoff);
1819                     gm.xoff += m.xoff;
1820                     gm.yoff += m.yoff;
1821                 }
1822             }
1823         }
1824     }
1825     return gm;
1826 }
1827
1828 QFont QTextEngine::font(const QScriptItem &si) const
1829 {
1830     QFont font = fnt;
1831     if (hasFormats()) {
1832         QTextCharFormat f = format(&si);
1833         font = f.font();
1834
1835         if (block.docHandle() && block.docHandle()->layout()) {
1836             // Make sure we get the right dpi on printers
1837             QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
1838             if (pdev)
1839                 font = QFont(font, pdev);
1840         } else {
1841             font = font.resolve(fnt);
1842         }
1843         QTextCharFormat::VerticalAlignment valign = f.verticalAlignment();
1844         if (valign == QTextCharFormat::AlignSuperScript || valign == QTextCharFormat::AlignSubScript) {
1845             if (font.pointSize() != -1)
1846                 font.setPointSize((font.pointSize() * 2) / 3);
1847             else
1848                 font.setPixelSize((font.pixelSize() * 2) / 3);
1849         }
1850     }
1851
1852     if (si.analysis.flags == QScriptAnalysis::SmallCaps)
1853         font = font.d->smallCapsFont();
1854
1855     return font;
1856 }
1857
1858 QTextEngine::FontEngineCache::FontEngineCache()
1859 {
1860     reset();
1861 }
1862
1863 //we cache the previous results of this function, as calling it numerous times with the same effective
1864 //input is common (and hard to cache at a higher level)
1865 QFontEngine *QTextEngine::fontEngine(const QScriptItem &si, QFixed *ascent, QFixed *descent, QFixed *leading) const
1866 {
1867     QFontEngine *engine = 0;
1868     QFontEngine *scaledEngine = 0;
1869     int script = si.analysis.script;
1870
1871     QFont font = fnt;
1872     if (hasFormats()) {
1873         if (feCache.prevFontEngine && feCache.prevPosition == si.position && feCache.prevLength == length(&si) && feCache.prevScript == script) {
1874             engine = feCache.prevFontEngine;
1875             scaledEngine = feCache.prevScaledFontEngine;
1876         } else {
1877             QTextCharFormat f = format(&si);
1878             font = f.font();
1879
1880             if (block.docHandle() && block.docHandle()->layout()) {
1881                 // Make sure we get the right dpi on printers
1882                 QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
1883                 if (pdev)
1884                     font = QFont(font, pdev);
1885             } else {
1886                 font = font.resolve(fnt);
1887             }
1888             engine = font.d->engineForScript(script);
1889             QTextCharFormat::VerticalAlignment valign = f.verticalAlignment();
1890             if (valign == QTextCharFormat::AlignSuperScript || valign == QTextCharFormat::AlignSubScript) {
1891                 if (font.pointSize() != -1)
1892                     font.setPointSize((font.pointSize() * 2) / 3);
1893                 else
1894                     font.setPixelSize((font.pixelSize() * 2) / 3);
1895                 scaledEngine = font.d->engineForScript(script);
1896             }
1897             feCache.prevFontEngine = engine;
1898             if (engine)
1899                 engine->ref.ref();
1900             feCache.prevScaledFontEngine = scaledEngine;
1901             if (scaledEngine)
1902                 scaledEngine->ref.ref();
1903             feCache.prevScript = script;
1904             feCache.prevPosition = si.position;
1905             feCache.prevLength = length(&si);
1906         }
1907     } else {
1908         if (feCache.prevFontEngine && feCache.prevScript == script && feCache.prevPosition == -1)
1909             engine = feCache.prevFontEngine;
1910         else {
1911             engine = font.d->engineForScript(script);
1912             feCache.prevFontEngine = engine;
1913             if (engine)
1914                 engine->ref.ref();
1915             feCache.prevScript = script;
1916             feCache.prevPosition = -1;
1917             feCache.prevLength = -1;
1918             feCache.prevScaledFontEngine = 0;
1919         }
1920     }
1921
1922     if (si.analysis.flags == QScriptAnalysis::SmallCaps) {
1923         QFontPrivate *p = font.d->smallCapsFontPrivate();
1924         scaledEngine = p->engineForScript(script);
1925     }
1926
1927     if (ascent) {
1928         *ascent = engine->ascent();
1929         *descent = engine->descent();
1930         *leading = engine->leading();
1931     }
1932
1933     if (scaledEngine)
1934         return scaledEngine;
1935     return engine;
1936 }
1937
1938 struct QJustificationPoint {
1939     int type;
1940     QFixed kashidaWidth;
1941     QGlyphLayout glyph;
1942     QFontEngine *fontEngine;
1943 };
1944
1945 Q_DECLARE_TYPEINFO(QJustificationPoint, Q_PRIMITIVE_TYPE);
1946
1947 static void set(QJustificationPoint *point, int type, const QGlyphLayout &glyph, QFontEngine *fe)
1948 {
1949     point->type = type;
1950     point->glyph = glyph;
1951     point->fontEngine = fe;
1952
1953     if (type >= HB_Arabic_Normal) {
1954         QChar ch(0x640); // Kashida character
1955         QGlyphLayoutArray<8> glyphs;
1956         int nglyphs = 7;
1957         fe->stringToCMap(&ch, 1, &glyphs, &nglyphs, 0);
1958         if (glyphs.glyphs[0] && glyphs.advances_x[0] != 0) {
1959             point->kashidaWidth = glyphs.advances_x[0];
1960         } else {
1961             point->type = HB_NoJustification;
1962             point->kashidaWidth = 0;
1963         }
1964     }
1965 }
1966
1967
1968 void QTextEngine::justify(const QScriptLine &line)
1969 {
1970 //     qDebug("justify: line.gridfitted = %d, line.justified=%d", line.gridfitted, line.justified);
1971     if (line.gridfitted && line.justified)
1972         return;
1973
1974     if (!line.gridfitted) {
1975         // redo layout in device metrics, then adjust
1976         const_cast<QScriptLine &>(line).gridfitted = true;
1977     }
1978
1979     if ((option.alignment() & Qt::AlignHorizontal_Mask) != Qt::AlignJustify)
1980         return;
1981
1982     itemize();
1983
1984     if (!forceJustification) {
1985         int end = line.from + (int)line.length;
1986         if (end == layoutData->string.length())
1987             return; // no justification at end of paragraph
1988         if (end && layoutData->items[findItem(end-1)].analysis.flags == QScriptAnalysis::LineOrParagraphSeparator)
1989             return; // no justification at the end of an explicitly separated line
1990     }
1991
1992     // justify line
1993     int maxJustify = 0;
1994
1995     // don't include trailing white spaces when doing justification
1996     int line_length = line.length;
1997     const HB_CharAttributes *a = attributes();
1998     if (! a)
1999         return;
2000     a += line.from;
2001     while (line_length && a[line_length-1].whiteSpace)
2002         --line_length;
2003     // subtract one char more, as we can't justfy after the last character
2004     --line_length;
2005
2006     if (!line_length)
2007         return;
2008
2009     int firstItem = findItem(line.from);
2010     int nItems = findItem(line.from + line_length - 1) - firstItem + 1;
2011
2012     QVarLengthArray<QJustificationPoint> justificationPoints;
2013     int nPoints = 0;
2014 //     qDebug("justifying from %d len %d, firstItem=%d, nItems=%d (%s)", line.from, line_length, firstItem, nItems, layoutData->string.mid(line.from, line_length).toUtf8().constData());
2015     QFixed minKashida = 0x100000;
2016
2017     // we need to do all shaping before we go into the next loop, as we there
2018     // store pointers to the glyph data that could get reallocated by the shaping
2019     // process.
2020     for (int i = 0; i < nItems; ++i) {
2021         QScriptItem &si = layoutData->items[firstItem + i];
2022         if (!si.num_glyphs)
2023             shape(firstItem + i);
2024     }
2025
2026     for (int i = 0; i < nItems; ++i) {
2027         QScriptItem &si = layoutData->items[firstItem + i];
2028
2029         int kashida_type = HB_Arabic_Normal;
2030         int kashida_pos = -1;
2031
2032         int start = qMax(line.from - si.position, 0);
2033         int end = qMin(line.from + line_length - (int)si.position, length(firstItem+i));
2034
2035         unsigned short *log_clusters = logClusters(&si);
2036
2037         int gs = log_clusters[start];
2038         int ge = (end == length(firstItem+i) ? si.num_glyphs : log_clusters[end]);
2039
2040         const QGlyphLayout g = shapedGlyphs(&si);
2041
2042         for (int i = gs; i < ge; ++i) {
2043             g.justifications[i].type = QGlyphJustification::JustifyNone;
2044             g.justifications[i].nKashidas = 0;
2045             g.justifications[i].space_18d6 = 0;
2046
2047             justificationPoints.resize(nPoints+3);
2048             int justification = g.attributes[i].justification;
2049
2050             switch(justification) {
2051             case HB_NoJustification:
2052                 break;
2053             case HB_Space          :
2054                 // fall through
2055             case HB_Arabic_Space   :
2056                 if (kashida_pos >= 0) {
2057 //                     qDebug("kashida position at %d in word", kashida_pos);
2058                     set(&justificationPoints[nPoints], kashida_type, g.mid(kashida_pos), fontEngine(si));
2059                     if (justificationPoints[nPoints].kashidaWidth > 0) {
2060                         minKashida = qMin(minKashida, justificationPoints[nPoints].kashidaWidth);
2061                         maxJustify = qMax(maxJustify, justificationPoints[nPoints].type);
2062                         ++nPoints;
2063                     }
2064                 }
2065                 kashida_pos = -1;
2066                 kashida_type = HB_Arabic_Normal;
2067                 // fall through
2068             case HB_Character      :
2069                 set(&justificationPoints[nPoints++], justification, g.mid(i), fontEngine(si));
2070                 maxJustify = qMax(maxJustify, justification);
2071                 break;
2072             case HB_Arabic_Normal  :
2073             case HB_Arabic_Waw     :
2074             case HB_Arabic_BaRa    :
2075             case HB_Arabic_Alef    :
2076             case HB_Arabic_HaaDal  :
2077             case HB_Arabic_Seen    :
2078             case HB_Arabic_Kashida :
2079                 if (justification >= kashida_type) {
2080                     kashida_pos = i;
2081                     kashida_type = justification;
2082                 }
2083             }
2084         }
2085         if (kashida_pos >= 0) {
2086             set(&justificationPoints[nPoints], kashida_type, g.mid(kashida_pos), fontEngine(si));
2087             if (justificationPoints[nPoints].kashidaWidth > 0) {
2088                 minKashida = qMin(minKashida, justificationPoints[nPoints].kashidaWidth);
2089                 maxJustify = qMax(maxJustify, justificationPoints[nPoints].type);
2090                 ++nPoints;
2091             }
2092         }
2093     }
2094
2095     QFixed leading = leadingSpaceWidth(line);
2096     QFixed need = line.width - line.textWidth - leading;
2097     if (need < 0) {
2098         // line overflows already!
2099         const_cast<QScriptLine &>(line).justified = true;
2100         return;
2101     }
2102
2103 //     qDebug("doing justification: textWidth=%x, requested=%x, maxJustify=%d", line.textWidth.value(), line.width.value(), maxJustify);
2104 //     qDebug("     minKashida=%f, need=%f", minKashida.toReal(), need.toReal());
2105
2106     // distribute in priority order
2107     if (maxJustify >= HB_Arabic_Normal) {
2108         while (need >= minKashida) {
2109             for (int type = maxJustify; need >= minKashida && type >= HB_Arabic_Normal; --type) {
2110                 for (int i = 0; need >= minKashida && i < nPoints; ++i) {
2111                     if (justificationPoints[i].type == type && justificationPoints[i].kashidaWidth <= need) {
2112                         justificationPoints[i].glyph.justifications->nKashidas++;
2113                         // ############
2114                         justificationPoints[i].glyph.justifications->space_18d6 += justificationPoints[i].kashidaWidth.value();
2115                         need -= justificationPoints[i].kashidaWidth;
2116 //                         qDebug("adding kashida type %d with width %x, neednow %x", type, justificationPoints[i].kashidaWidth, need.value());
2117                     }
2118                 }
2119             }
2120         }
2121     }
2122     Q_ASSERT(need >= 0);
2123     if (!need)
2124         goto end;
2125
2126     maxJustify = qMin(maxJustify, (int)HB_Space);
2127     for (int type = maxJustify; need != 0 && type > 0; --type) {
2128         int n = 0;
2129         for (int i = 0; i < nPoints; ++i) {
2130             if (justificationPoints[i].type == type)
2131                 ++n;
2132         }
2133 //          qDebug("number of points for justification type %d: %d", type, n);
2134
2135
2136         if (!n)
2137             continue;
2138
2139         for (int i = 0; i < nPoints; ++i) {
2140             if (justificationPoints[i].type == type) {
2141                 QFixed add = need/n;
2142 //                  qDebug("adding %x to glyph %x", add.value(), justificationPoints[i].glyph->glyph);
2143                 justificationPoints[i].glyph.justifications[0].space_18d6 = add.value();
2144                 need -= add;
2145                 --n;
2146             }
2147         }
2148
2149         Q_ASSERT(!need);
2150     }
2151  end:
2152     const_cast<QScriptLine &>(line).justified = true;
2153 }
2154
2155 void QScriptLine::setDefaultHeight(QTextEngine *eng)
2156 {
2157     QFont f;
2158     QFontEngine *e;
2159
2160     if (eng->block.docHandle() && eng->block.docHandle()->layout()) {
2161         f = eng->block.charFormat().font();
2162         // Make sure we get the right dpi on printers
2163         QPaintDevice *pdev = eng->block.docHandle()->layout()->paintDevice();
2164         if (pdev)
2165             f = QFont(f, pdev);
2166         e = f.d->engineForScript(QUnicodeTables::Common);
2167     } else {
2168         e = eng->fnt.d->engineForScript(QUnicodeTables::Common);
2169     }
2170
2171     QFixed other_ascent = e->ascent();
2172     QFixed other_descent = e->descent();
2173     QFixed other_leading = e->leading();
2174     leading = qMax(leading + ascent, other_leading + other_ascent) - qMax(ascent, other_ascent);
2175     ascent = qMax(ascent, other_ascent);
2176     descent = qMax(descent, other_descent);
2177 }
2178
2179 QTextEngine::LayoutData::LayoutData()
2180 {
2181     memory = 0;
2182     allocated = 0;
2183     memory_on_stack = false;
2184     used = 0;
2185     hasBidi = false;
2186     layoutState = LayoutEmpty;
2187     haveCharAttributes = false;
2188     logClustersPtr = 0;
2189     available_glyphs = 0;
2190 }
2191
2192 QTextEngine::LayoutData::LayoutData(const QString &str, void **stack_memory, int _allocated)
2193     : string(str)
2194 {
2195     allocated = _allocated;
2196
2197     int space_charAttributes = sizeof(HB_CharAttributes)*string.length()/sizeof(void*) + 1;
2198     int space_logClusters = sizeof(unsigned short)*string.length()/sizeof(void*) + 1;
2199     available_glyphs = ((int)allocated - space_charAttributes - space_logClusters)*(int)sizeof(void*)/(int)QGlyphLayout::spaceNeededForGlyphLayout(1);
2200
2201     if (available_glyphs < str.length()) {
2202         // need to allocate on the heap
2203         allocated = 0;
2204
2205         memory_on_stack = false;
2206         memory = 0;
2207         logClustersPtr = 0;
2208     } else {
2209         memory_on_stack = true;
2210         memory = stack_memory;
2211         logClustersPtr = (unsigned short *)(memory + space_charAttributes);
2212
2213         void *m = memory + space_charAttributes + space_logClusters;
2214         glyphLayout = QGlyphLayout(reinterpret_cast<char *>(m), str.length());
2215         glyphLayout.clear();
2216         memset(memory, 0, space_charAttributes*sizeof(void *));
2217     }
2218     used = 0;
2219     hasBidi = false;
2220     layoutState = LayoutEmpty;
2221     haveCharAttributes = false;
2222 }
2223
2224 QTextEngine::LayoutData::~LayoutData()
2225 {
2226     if (!memory_on_stack)
2227         free(memory);
2228     memory = 0;
2229 }
2230
2231 bool QTextEngine::LayoutData::reallocate(int totalGlyphs)
2232 {
2233     Q_ASSERT(totalGlyphs >= glyphLayout.numGlyphs);
2234     if (memory_on_stack && available_glyphs >= totalGlyphs) {
2235         glyphLayout.grow(glyphLayout.data(), totalGlyphs);
2236         return true;
2237     }
2238
2239     int space_charAttributes = sizeof(HB_CharAttributes)*string.length()/sizeof(void*) + 1;
2240     int space_logClusters = sizeof(unsigned short)*string.length()/sizeof(void*) + 1;
2241     int space_glyphs = QGlyphLayout::spaceNeededForGlyphLayout(totalGlyphs)/sizeof(void*) + 2;
2242
2243     int newAllocated = space_charAttributes + space_glyphs + space_logClusters;
2244     // These values can be negative if the length of string/glyphs causes overflow,
2245     // we can't layout such a long string all at once, so return false here to
2246     // indicate there is a failure
2247     if (space_charAttributes < 0 || space_logClusters < 0 || space_glyphs < 0 || newAllocated < allocated) {
2248         layoutState = LayoutFailed;
2249         return false;
2250     }
2251
2252     void **newMem = memory;
2253     newMem = (void **)::realloc(memory_on_stack ? 0 : memory, newAllocated*sizeof(void *));
2254     if (!newMem) {
2255         layoutState = LayoutFailed;
2256         return false;
2257     }
2258     if (memory_on_stack)
2259         memcpy(newMem, memory, allocated*sizeof(void *));
2260     memory = newMem;
2261     memory_on_stack = false;
2262
2263     void **m = memory;
2264     m += space_charAttributes;
2265     logClustersPtr = (unsigned short *) m;
2266     m += space_logClusters;
2267
2268     const int space_preGlyphLayout = space_charAttributes + space_logClusters;
2269     if (allocated < space_preGlyphLayout)
2270         memset(memory + allocated, 0, (space_preGlyphLayout - allocated)*sizeof(void *));
2271
2272     glyphLayout.grow(reinterpret_cast<char *>(m), totalGlyphs);
2273
2274     allocated = newAllocated;
2275     return true;
2276 }
2277
2278 // grow to the new size, copying the existing data to the new layout
2279 void QGlyphLayout::grow(char *address, int totalGlyphs)
2280 {
2281     QGlyphLayout oldLayout(address, numGlyphs);
2282     QGlyphLayout newLayout(address, totalGlyphs);
2283
2284     if (numGlyphs) {
2285         // move the existing data
2286         memmove(newLayout.attributes, oldLayout.attributes, numGlyphs * sizeof(HB_GlyphAttributes));
2287         memmove(newLayout.justifications, oldLayout.justifications, numGlyphs * sizeof(QGlyphJustification));
2288         memmove(newLayout.advances_y, oldLayout.advances_y, numGlyphs * sizeof(QFixed));
2289         memmove(newLayout.advances_x, oldLayout.advances_x, numGlyphs * sizeof(QFixed));
2290         memmove(newLayout.glyphs, oldLayout.glyphs, numGlyphs * sizeof(HB_Glyph));
2291     }
2292
2293     // clear the new data
2294     newLayout.clear(numGlyphs);
2295
2296     *this = newLayout;
2297 }
2298
2299 void QTextEngine::freeMemory()
2300 {
2301     if (!stackEngine) {
2302         delete layoutData;
2303         layoutData = 0;
2304     } else {
2305         layoutData->used = 0;
2306         layoutData->hasBidi = false;
2307         layoutData->layoutState = LayoutEmpty;
2308         layoutData->haveCharAttributes = false;
2309     }
2310     for (int i = 0; i < lines.size(); ++i) {
2311         lines[i].justified = 0;
2312         lines[i].gridfitted = 0;
2313     }
2314 }
2315
2316 int QTextEngine::formatIndex(const QScriptItem *si) const
2317 {
2318     if (specialData && !specialData->resolvedFormatIndices.isEmpty())
2319         return specialData->resolvedFormatIndices.at(si - &layoutData->items[0]);
2320     QTextDocumentPrivate *p = block.docHandle();
2321     if (!p)
2322         return -1;
2323     int pos = si->position;
2324     if (specialData && si->position >= specialData->preeditPosition) {
2325         if (si->position < specialData->preeditPosition + specialData->preeditText.length())
2326             pos = qMax(specialData->preeditPosition - 1, 0);
2327         else
2328             pos -= specialData->preeditText.length();
2329     }
2330     QTextDocumentPrivate::FragmentIterator it = p->find(block.position() + pos);
2331     return it.value()->format;
2332 }
2333
2334
2335 QTextCharFormat QTextEngine::format(const QScriptItem *si) const
2336 {
2337     QTextCharFormat format;
2338     const QTextFormatCollection *formats = 0;
2339     if (block.docHandle()) {
2340         formats = this->formats();
2341         format = formats->charFormat(formatIndex(si));
2342     }
2343     if (specialData && specialData->resolvedFormatIndices.isEmpty()) {
2344         int end = si->position + length(si);
2345         for (int i = 0; i < specialData->addFormats.size(); ++i) {
2346             const QTextLayout::FormatRange &r = specialData->addFormats.at(i);
2347             if (r.start <= si->position && r.start + r.length >= end) {
2348                 if (!specialData->addFormatIndices.isEmpty())
2349                     format.merge(formats->format(specialData->addFormatIndices.at(i)));
2350                 else
2351                     format.merge(r.format);
2352             }
2353         }
2354     }
2355     return format;
2356 }
2357
2358 void QTextEngine::addRequiredBoundaries() const
2359 {
2360     if (specialData) {
2361         for (int i = 0; i < specialData->addFormats.size(); ++i) {
2362             const QTextLayout::FormatRange &r = specialData->addFormats.at(i);
2363             setBoundary(r.start);
2364             setBoundary(r.start + r.length);
2365             //qDebug("adding boundaries %d %d", r.start, r.start+r.length);
2366         }
2367     }
2368 }
2369
2370 bool QTextEngine::atWordSeparator(int position) const
2371 {
2372     const QChar c = layoutData->string.at(position);
2373     switch (c.toLatin1()) {
2374     case '.':
2375     case ',':
2376     case '?':
2377     case '!':
2378     case '@':
2379     case '#':
2380     case '$':
2381     case ':':
2382     case ';':
2383     case '-':
2384     case '<':
2385     case '>':
2386     case '[':
2387     case ']':
2388     case '(':
2389     case ')':
2390     case '{':
2391     case '}':
2392     case '=':
2393     case '/':
2394     case '+':
2395     case '%':
2396     case '&':
2397     case '^':
2398     case '*':
2399     case '\'':
2400     case '"':
2401     case '`':
2402     case '~':
2403     case '|':
2404         return true;
2405     default:
2406         return false;
2407     }
2408 }
2409
2410 bool QTextEngine::atSpace(int position) const
2411 {
2412     const QChar c = layoutData->string.at(position);
2413
2414     return c == QLatin1Char(' ')
2415         || c == QChar::Nbsp
2416         || c == QChar::LineSeparator
2417         || c == QLatin1Char('\t')
2418         ;
2419 }
2420
2421
2422 void QTextEngine::indexAdditionalFormats()
2423 {
2424     if (!block.docHandle())
2425         return;
2426
2427     specialData->addFormatIndices.resize(specialData->addFormats.count());
2428     QTextFormatCollection * const formats = this->formats();
2429
2430     for (int i = 0; i < specialData->addFormats.count(); ++i) {
2431         specialData->addFormatIndices[i] = formats->indexForFormat(specialData->addFormats.at(i).format);
2432         specialData->addFormats[i].format = QTextCharFormat();
2433     }
2434 }
2435
2436 /* These two helper functions are used to determine whether we need to insert a ZWJ character
2437    between the text that gets truncated and the ellipsis. This is important to get
2438    correctly shaped results for arabic text.
2439 */
2440 static inline bool nextCharJoins(const QString &string, int pos)
2441 {
2442     while (pos < string.length() && string.at(pos).category() == QChar::Mark_NonSpacing)
2443         ++pos;
2444     if (pos == string.length())
2445         return false;
2446     return string.at(pos).joining() != QChar::OtherJoining;
2447 }
2448
2449 static inline bool prevCharJoins(const QString &string, int pos)
2450 {
2451     while (pos > 0 && string.at(pos - 1).category() == QChar::Mark_NonSpacing)
2452         --pos;
2453     if (pos == 0)
2454         return false;
2455     QChar::Joining joining = string.at(pos - 1).joining();
2456     return (joining == QChar::Dual || joining == QChar::Center);
2457 }
2458
2459 QString QTextEngine::elidedText(Qt::TextElideMode mode, const QFixed &width, int flags) const
2460 {
2461 //    qDebug() << "elidedText; available width" << width.toReal() << "text width:" << this->width(0, layoutData->string.length()).toReal();
2462
2463     if (flags & Qt::TextShowMnemonic) {
2464         itemize();
2465         HB_CharAttributes *attributes = const_cast<HB_CharAttributes *>(this->attributes());
2466         if (!attributes)
2467             return QString();
2468         for (int i = 0; i < layoutData->items.size(); ++i) {
2469             QScriptItem &si = layoutData->items[i];
2470             if (!si.num_glyphs)
2471                 shape(i);
2472
2473             unsigned short *logClusters = this->logClusters(&si);
2474             QGlyphLayout glyphs = shapedGlyphs(&si);
2475
2476             const int end = si.position + length(&si);
2477             for (int i = si.position; i < end - 1; ++i) {
2478                 if (layoutData->string.at(i) == QLatin1Char('&')) {
2479                     const int gp = logClusters[i - si.position];
2480                     glyphs.attributes[gp].dontPrint = true;
2481                     attributes[i + 1].charStop = false;
2482                     attributes[i + 1].whiteSpace = false;
2483                     attributes[i + 1].lineBreakType = HB_NoBreak;
2484                     if (layoutData->string.at(i + 1) == QLatin1Char('&'))
2485                         ++i;
2486                 }
2487             }
2488         }
2489     }
2490
2491     validate();
2492
2493     if (mode == Qt::ElideNone
2494         || this->width(0, layoutData->string.length()) <= width
2495         || layoutData->string.length() <= 1)
2496         return layoutData->string;
2497
2498     QFixed ellipsisWidth;
2499     QString ellipsisText;
2500     {
2501         QChar ellipsisChar(0x2026);
2502
2503         QFontEngine *fe = fnt.d->engineForScript(QUnicodeTables::Common);
2504
2505         QGlyphLayoutArray<1> ellipsisGlyph;
2506         {
2507             QFontEngine *feForEllipsis = (fe->type() == QFontEngine::Multi)
2508                 ? static_cast<QFontEngineMulti *>(fe)->engine(0)
2509                 : fe;
2510
2511             if (feForEllipsis->type() == QFontEngine::Mac)
2512                 feForEllipsis = fe;
2513
2514             // the lookup can be really slow when we use XLFD fonts
2515             if (feForEllipsis->type() != QFontEngine::XLFD
2516                 && feForEllipsis->canRender(&ellipsisChar, 1)) {
2517                     int nGlyphs = 1;
2518                     feForEllipsis->stringToCMap(&ellipsisChar, 1, &ellipsisGlyph, &nGlyphs, 0);
2519                 }
2520         }
2521
2522         if (ellipsisGlyph.glyphs[0]) {
2523             ellipsisWidth = ellipsisGlyph.advances_x[0];
2524             ellipsisText = ellipsisChar;
2525         } else {
2526             QString dotDotDot(QLatin1String("..."));
2527
2528             QGlyphLayoutArray<3> glyphs;
2529             int nGlyphs = 3;
2530             if (!fe->stringToCMap(dotDotDot.constData(), 3, &glyphs, &nGlyphs, 0))
2531                 // should never happen...
2532                 return layoutData->string;
2533             for (int i = 0; i < nGlyphs; ++i)
2534                 ellipsisWidth += glyphs.advances_x[i];
2535             ellipsisText = dotDotDot;
2536         }
2537     }
2538
2539     const QFixed availableWidth = width - ellipsisWidth;
2540     if (availableWidth < 0)
2541         return QString();
2542
2543     const HB_CharAttributes *attributes = this->attributes();
2544     if (!attributes)
2545         return QString();
2546
2547     if (mode == Qt::ElideRight) {
2548         QFixed currentWidth;
2549         int pos;
2550         int nextBreak = 0;
2551
2552         do {
2553             pos = nextBreak;
2554
2555             ++nextBreak;
2556             while (nextBreak < layoutData->string.length() && !attributes[nextBreak].charStop)
2557                 ++nextBreak;
2558
2559             currentWidth += this->width(pos, nextBreak - pos);
2560         } while (nextBreak < layoutData->string.length()
2561                  && currentWidth < availableWidth);
2562
2563         if (nextCharJoins(layoutData->string, pos))
2564             ellipsisText.prepend(QChar(0x200d) /* ZWJ */);
2565
2566         return layoutData->string.left(pos) + ellipsisText;
2567     } else if (mode == Qt::ElideLeft) {
2568         QFixed currentWidth;
2569         int pos;
2570         int nextBreak = layoutData->string.length();
2571
2572         do {
2573             pos = nextBreak;
2574
2575             --nextBreak;
2576             while (nextBreak > 0 && !attributes[nextBreak].charStop)
2577                 --nextBreak;
2578
2579             currentWidth += this->width(nextBreak, pos - nextBreak);
2580         } while (nextBreak > 0
2581                  && currentWidth < availableWidth);
2582
2583         if (prevCharJoins(layoutData->string, pos))
2584             ellipsisText.append(QChar(0x200d) /* ZWJ */);
2585
2586         return ellipsisText + layoutData->string.mid(pos);
2587     } else if (mode == Qt::ElideMiddle) {
2588         QFixed leftWidth;
2589         QFixed rightWidth;
2590
2591         int leftPos = 0;
2592         int nextLeftBreak = 0;
2593
2594         int rightPos = layoutData->string.length();
2595         int nextRightBreak = layoutData->string.length();
2596
2597         do {
2598             leftPos = nextLeftBreak;
2599             rightPos = nextRightBreak;
2600
2601             ++nextLeftBreak;
2602             while (nextLeftBreak < layoutData->string.length() && !attributes[nextLeftBreak].charStop)
2603                 ++nextLeftBreak;
2604
2605             --nextRightBreak;
2606             while (nextRightBreak > 0 && !attributes[nextRightBreak].charStop)
2607                 --nextRightBreak;
2608
2609             leftWidth += this->width(leftPos, nextLeftBreak - leftPos);
2610             rightWidth += this->width(nextRightBreak, rightPos - nextRightBreak);
2611         } while (nextLeftBreak < layoutData->string.length()
2612                  && nextRightBreak > 0
2613                  && leftWidth + rightWidth < availableWidth);
2614
2615         if (nextCharJoins(layoutData->string, leftPos))
2616             ellipsisText.prepend(QChar(0x200d) /* ZWJ */);
2617         if (prevCharJoins(layoutData->string, rightPos))
2618             ellipsisText.append(QChar(0x200d) /* ZWJ */);
2619
2620         return layoutData->string.left(leftPos) + ellipsisText + layoutData->string.mid(rightPos);
2621     }
2622
2623     return layoutData->string;
2624 }
2625
2626 void QTextEngine::setBoundary(int strPos) const
2627 {
2628     if (strPos <= 0 || strPos >= layoutData->string.length())
2629         return;
2630
2631     int itemToSplit = 0;
2632     while (itemToSplit < layoutData->items.size() && layoutData->items.at(itemToSplit).position <= strPos)
2633         itemToSplit++;
2634     itemToSplit--;
2635     if (layoutData->items.at(itemToSplit).position == strPos) {
2636         // already a split at the requested position
2637         return;
2638     }
2639     splitItem(itemToSplit, strPos - layoutData->items.at(itemToSplit).position);
2640 }
2641
2642 void QTextEngine::splitItem(int item, int pos) const
2643 {
2644     if (pos <= 0)
2645         return;
2646
2647     layoutData->items.insert(item + 1, layoutData->items[item]);
2648     QScriptItem &oldItem = layoutData->items[item];
2649     QScriptItem &newItem = layoutData->items[item+1];
2650     newItem.position += pos;
2651
2652     if (oldItem.num_glyphs) {
2653         // already shaped, break glyphs aswell
2654         int breakGlyph = logClusters(&oldItem)[pos];
2655
2656         newItem.num_glyphs = oldItem.num_glyphs - breakGlyph;
2657         oldItem.num_glyphs = breakGlyph;
2658         newItem.glyph_data_offset = oldItem.glyph_data_offset + breakGlyph;
2659
2660         for (int i = 0; i < newItem.num_glyphs; i++)
2661             logClusters(&newItem)[i] -= breakGlyph;
2662
2663         QFixed w = 0;
2664         const QGlyphLayout g = shapedGlyphs(&oldItem);
2665         for(int j = 0; j < breakGlyph; ++j)
2666             w += g.advances_x[j] * !g.attributes[j].dontPrint;
2667
2668         newItem.width = oldItem.width - w;
2669         oldItem.width = w;
2670     }
2671
2672 //     qDebug("split at position %d itempos=%d", pos, item);
2673 }
2674
2675 QFixed QTextEngine::calculateTabWidth(int item, QFixed x) const
2676 {
2677     const QScriptItem &si = layoutData->items[item];
2678
2679     QFixed dpiScale = 1;
2680     if (block.docHandle() && block.docHandle()->layout()) {
2681         QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
2682         if (pdev)
2683             dpiScale = QFixed::fromReal(pdev->logicalDpiY() / qreal(qt_defaultDpiY()));
2684     } else {
2685         dpiScale = QFixed::fromReal(fnt.d->dpi / qreal(qt_defaultDpiY()));
2686     }
2687
2688     QList<QTextOption::Tab> tabArray = option.tabs();
2689     if (!tabArray.isEmpty()) {
2690         if (isRightToLeft()) { // rebase the tabArray positions.
2691             QList<QTextOption::Tab> newTabs;
2692             QList<QTextOption::Tab>::Iterator iter = tabArray.begin();
2693             while(iter != tabArray.end()) {
2694                 QTextOption::Tab tab = *iter;
2695                 if (tab.type == QTextOption::LeftTab)
2696                     tab.type = QTextOption::RightTab;
2697                 else if (tab.type == QTextOption::RightTab)
2698                     tab.type = QTextOption::LeftTab;
2699                 newTabs << tab;
2700                 ++iter;
2701             }
2702             tabArray = newTabs;
2703         }
2704         for (int i = 0; i < tabArray.size(); ++i) {
2705             QFixed tab = QFixed::fromReal(tabArray[i].position) * dpiScale;
2706             if (tab > x) {  // this is the tab we need.
2707                 QTextOption::Tab tabSpec = tabArray[i];
2708                 int tabSectionEnd = layoutData->string.count();
2709                 if (tabSpec.type == QTextOption::RightTab || tabSpec.type == QTextOption::CenterTab) {
2710                     // find next tab to calculate the width required.
2711                     tab = QFixed::fromReal(tabSpec.position);
2712                     for (int i=item + 1; i < layoutData->items.count(); i++) {
2713                         const QScriptItem &item = layoutData->items[i];
2714                         if (item.analysis.flags == QScriptAnalysis::TabOrObject) { // found it.
2715                             tabSectionEnd = item.position;
2716                             break;
2717                         }
2718                     }
2719                 }
2720                 else if (tabSpec.type == QTextOption::DelimiterTab)
2721                     // find delimitor character to calculate the width required
2722                     tabSectionEnd = qMax(si.position, layoutData->string.indexOf(tabSpec.delimiter, si.position) + 1);
2723
2724                 if (tabSectionEnd > si.position) {
2725                     QFixed length;
2726                     // Calculate the length of text between this tab and the tabSectionEnd
2727                     for (int i=item; i < layoutData->items.count(); i++) {
2728                         QScriptItem &item = layoutData->items[i];
2729                         if (item.position > tabSectionEnd || item.position <= si.position)
2730                             continue;
2731                         shape(i); // first, lets make sure relevant text is already shaped
2732                         QGlyphLayout glyphs = this->shapedGlyphs(&item);
2733                         const int end = qMin(item.position + item.num_glyphs, tabSectionEnd) - item.position;
2734                         for (int i=0; i < end; i++)
2735                             length += glyphs.advances_x[i] * !glyphs.attributes[i].dontPrint;
2736                         if (end + item.position == tabSectionEnd && tabSpec.type == QTextOption::DelimiterTab) // remove half of matching char
2737                             length -= glyphs.advances_x[end] / 2 * !glyphs.attributes[end].dontPrint;
2738                     }
2739
2740                     switch (tabSpec.type) {
2741                     case QTextOption::CenterTab:
2742                         length /= 2;
2743                         // fall through
2744                     case QTextOption::DelimiterTab:
2745                         // fall through
2746                     case QTextOption::RightTab:
2747                         tab = QFixed::fromReal(tabSpec.position) * dpiScale - length;
2748                         if (tab < 0) // default to tab taking no space
2749                             return QFixed();
2750                         break;
2751                     case QTextOption::LeftTab:
2752                         break;
2753                     }
2754                 }
2755                 return tab - x;
2756             }
2757         }
2758     }
2759     QFixed tab = QFixed::fromReal(option.tabStop());
2760     if (tab <= 0)
2761         tab = 80; // default
2762     tab *= dpiScale;
2763     QFixed nextTabPos = ((x / tab).truncate() + 1) * tab;
2764     QFixed tabWidth = nextTabPos - x;
2765
2766     return tabWidth;
2767 }
2768
2769 void QTextEngine::resolveAdditionalFormats() const
2770 {
2771     if (!specialData || specialData->addFormats.isEmpty()
2772         || !block.docHandle()
2773         || !specialData->resolvedFormatIndices.isEmpty())
2774         return;
2775
2776     QTextFormatCollection *collection = this->formats();
2777
2778     specialData->resolvedFormatIndices.clear();
2779     QVector<int> indices(layoutData->items.count());
2780     for (int i = 0; i < layoutData->items.count(); ++i) {
2781         QTextCharFormat f = format(&layoutData->items.at(i));
2782         indices[i] = collection->indexForFormat(f);
2783     }
2784     specialData->resolvedFormatIndices = indices;
2785 }
2786
2787 QFixed QTextEngine::leadingSpaceWidth(const QScriptLine &line)
2788 {
2789     if (!line.hasTrailingSpaces
2790         || (option.flags() & QTextOption::IncludeTrailingSpaces)
2791         || !isRightToLeft())
2792         return QFixed();
2793
2794     int pos = line.length;
2795     const HB_CharAttributes *attributes = this->attributes();
2796     if (!attributes)
2797         return QFixed();
2798     while (pos > 0 && attributes[line.from + pos - 1].whiteSpace)
2799         --pos;
2800     return width(line.from + pos, line.length - pos);
2801 }
2802
2803 QFixed QTextEngine::alignLine(const QScriptLine &line)
2804 {
2805     QFixed x = 0;
2806     justify(line);
2807     // if width is QFIXED_MAX that means we used setNumColumns() and that implicitly makes this line left aligned.
2808     if (!line.justified && line.width != QFIXED_MAX) {
2809         int align = option.alignment();
2810         if (align & Qt::AlignLeft)
2811             x -= leadingSpaceWidth(line);
2812         if (align & Qt::AlignJustify && isRightToLeft())
2813             align = Qt::AlignRight;
2814         if (align & Qt::AlignRight)
2815             x = line.width - (line.textAdvance + leadingSpaceWidth(line));
2816         else if (align & Qt::AlignHCenter)
2817             x = (line.width - line.textAdvance)/2 - leadingSpaceWidth(line);
2818     }
2819     return x;
2820 }
2821
2822 QFixed QTextEngine::offsetInLigature(const QScriptItem *si, int pos, int max, int glyph_pos)
2823 {
2824     unsigned short *logClusters = this->logClusters(si);
2825     const QGlyphLayout &glyphs = shapedGlyphs(si);
2826
2827     int offsetInCluster = 0;
2828     for (int i = pos - 1; i >= 0; i--) {
2829         if (logClusters[i] == glyph_pos)
2830             offsetInCluster++;
2831         else
2832             break;
2833     }
2834
2835     // in the case that the offset is inside a (multi-character) glyph,
2836     // interpolate the position.
2837     if (offsetInCluster > 0) {
2838         int clusterLength = 0;
2839         for (int i = pos - offsetInCluster; i < max; i++) {
2840             if (logClusters[i] == glyph_pos)
2841                 clusterLength++;
2842             else
2843                 break;
2844         }
2845         if (clusterLength)
2846             return glyphs.advances_x[glyph_pos] * offsetInCluster / clusterLength;
2847     }
2848
2849     return 0;
2850 }
2851
2852 // Scan in logClusters[from..to-1] for glyph_pos
2853 int QTextEngine::getClusterLength(unsigned short *logClusters,
2854                                   const HB_CharAttributes *attributes,
2855                                   int from, int to, int glyph_pos, int *start)
2856 {
2857     int clusterLength = 0;
2858     for (int i = from; i < to; i++) {
2859         if (logClusters[i] == glyph_pos && attributes[i].charStop) {
2860             if (*start < 0)
2861                 *start = i;
2862             clusterLength++;
2863         }
2864         else if (clusterLength)
2865             break;
2866     }
2867     return clusterLength;
2868 }
2869
2870 int QTextEngine::positionInLigature(const QScriptItem *si, int end,
2871                                     QFixed x, QFixed edge, int glyph_pos,
2872                                     bool cursorOnCharacter)
2873 {
2874     unsigned short *logClusters = this->logClusters(si);
2875     int clusterStart = -1;
2876     int clusterLength = 0;
2877
2878     if (si->analysis.script != QUnicodeTables::Common &&
2879         si->analysis.script != QUnicodeTables::Greek) {
2880         if (glyph_pos == -1)
2881             return si->position + end;
2882         else {
2883             int i;
2884             for (i = 0; i < end; i++)
2885                 if (logClusters[i] == glyph_pos)
2886                     break;
2887             return si->position + i;
2888         }
2889     }
2890
2891     if (glyph_pos == -1 && end > 0)
2892         glyph_pos = logClusters[end - 1];
2893     else {
2894         if (x <= edge)
2895             glyph_pos--;
2896     }
2897
2898     const HB_CharAttributes *attrs = attributes();
2899     logClusters = this->logClusters(si);
2900     clusterLength = getClusterLength(logClusters, attrs, 0, end, glyph_pos, &clusterStart);
2901
2902     if (clusterLength) {
2903         const QGlyphLayout &glyphs = shapedGlyphs(si);
2904         QFixed glyphWidth = glyphs.effectiveAdvance(glyph_pos);
2905         // the approximate width of each individual element of the ligature
2906         QFixed perItemWidth = glyphWidth / clusterLength;
2907         QFixed left = x > edge ? edge : edge - glyphWidth;
2908         int n = ((x - left) / perItemWidth).floor().toInt();
2909         QFixed dist = x - left - n * perItemWidth;
2910         int closestItem = dist > (perItemWidth / 2) ? n + 1 : n;
2911         if (cursorOnCharacter && closestItem > 0)
2912             closestItem--;
2913         int pos = si->position + clusterStart + closestItem;
2914         // Jump to the next charStop
2915         while (!attrs[pos].charStop && pos < end)
2916             pos++;
2917         return pos;
2918     }
2919     return si->position + end;
2920 }
2921
2922 int QTextEngine::previousLogicalPosition(int oldPos) const
2923 {
2924     const HB_CharAttributes *attrs = attributes();
2925     if (!attrs || oldPos < 0)
2926         return oldPos;
2927
2928     if (oldPos <= 0)
2929         return 0;
2930     oldPos--;
2931     while (oldPos && !attrs[oldPos].charStop)
2932         oldPos--;
2933     return oldPos;
2934 }
2935
2936 int QTextEngine::nextLogicalPosition(int oldPos) const
2937 {
2938     const HB_CharAttributes *attrs = attributes();
2939     int len = block.isValid() ? block.length() - 1
2940                               : layoutData->string.length();
2941     Q_ASSERT(len <= layoutData->string.length());
2942     if (!attrs || oldPos < 0 || oldPos >= len)
2943         return oldPos;
2944
2945     oldPos++;
2946     while (oldPos < len && !attrs[oldPos].charStop)
2947         oldPos++;
2948     return oldPos;
2949 }
2950
2951 int QTextEngine::lineNumberForTextPosition(int pos)
2952 {
2953     if (!layoutData)
2954         itemize();
2955     if (pos == layoutData->string.length() && lines.size())
2956         return lines.size() - 1;
2957     for (int i = 0; i < lines.size(); ++i) {
2958         const QScriptLine& line = lines[i];
2959         if (line.from + line.length + line.trailingSpaces > pos)
2960             return i;
2961     }
2962     return -1;
2963 }
2964
2965 void QTextEngine::insertionPointsForLine(int lineNum, QVector<int> &insertionPoints)
2966 {
2967     QTextLineItemIterator iterator(this, lineNum);
2968     bool rtl = isRightToLeft();
2969     bool lastLine = lineNum >= lines.size() - 1;
2970
2971     while (!iterator.atEnd()) {
2972         iterator.next();
2973         const QScriptItem *si = &layoutData->items[iterator.item];
2974         if (si->analysis.bidiLevel % 2) {
2975             int i = iterator.itemEnd - 1, min = iterator.itemStart;
2976             if (lastLine && (rtl ? iterator.atBeginning() : iterator.atEnd()))
2977                 i++;
2978             for (; i >= min; i--)
2979                 insertionPoints.push_back(i);
2980         } else {
2981             int i = iterator.itemStart, max = iterator.itemEnd;
2982             if (lastLine && (rtl ? iterator.atBeginning() : iterator.atEnd()))
2983                 max++;
2984             for (; i < max; i++)
2985                 insertionPoints.push_back(i);
2986         }
2987     }
2988 }
2989
2990 int QTextEngine::endOfLine(int lineNum)
2991 {
2992     QVector<int> insertionPoints;
2993     insertionPointsForLine(lineNum, insertionPoints);
2994
2995     if (insertionPoints.size() > 0)
2996         return insertionPoints.last();
2997     return 0;
2998 }
2999
3000 int QTextEngine::beginningOfLine(int lineNum)
3001 {
3002     QVector<int> insertionPoints;
3003     insertionPointsForLine(lineNum, insertionPoints);
3004
3005     if (insertionPoints.size() > 0)
3006         return insertionPoints.first();
3007     return 0;
3008 }
3009
3010 int QTextEngine::positionAfterVisualMovement(int pos, QTextCursor::MoveOperation op)
3011 {
3012     if (!layoutData)
3013         itemize();
3014
3015     bool moveRight = (op == QTextCursor::Right);
3016     bool alignRight = isRightToLeft();
3017     if (!layoutData->hasBidi)
3018         return moveRight ^ alignRight ? nextLogicalPosition(pos) : previousLogicalPosition(pos);
3019
3020     int lineNum = lineNumberForTextPosition(pos);
3021     Q_ASSERT(lineNum >= 0);
3022
3023     QVector<int> insertionPoints;
3024     insertionPointsForLine(lineNum, insertionPoints);
3025     int i, max = insertionPoints.size();
3026     for (i = 0; i < max; i++)
3027         if (pos == insertionPoints[i]) {
3028             if (moveRight) {
3029                 if (i + 1 < max)
3030                     return insertionPoints[i + 1];
3031             } else {
3032                 if (i > 0)
3033                     return insertionPoints[i - 1];
3034             }
3035
3036             if (moveRight ^ alignRight) {
3037                 if (lineNum + 1 < lines.size())
3038                     return alignRight ? endOfLine(lineNum + 1) : beginningOfLine(lineNum + 1);
3039             }
3040             else {
3041                 if (lineNum > 0)
3042                     return alignRight ? beginningOfLine(lineNum - 1) : endOfLine(lineNum - 1);
3043             }
3044         }
3045
3046     return pos;
3047 }
3048
3049 QStackTextEngine::QStackTextEngine(const QString &string, const QFont &f)
3050     : QTextEngine(string, f),
3051       _layoutData(string, _memory, MemSize)
3052 {
3053     stackEngine = true;
3054     layoutData = &_layoutData;
3055 }
3056
3057 QTextItemInt::QTextItemInt(const QScriptItem &si, QFont *font, const QTextCharFormat &format)
3058     : justified(false), underlineStyle(QTextCharFormat::NoUnderline), charFormat(format),
3059       num_chars(0), chars(0), logClusters(0), f(0), fontEngine(0)
3060 {
3061     f = font;
3062     fontEngine = f->d->engineForScript(si.analysis.script);
3063     Q_ASSERT(fontEngine);
3064
3065     initWithScriptItem(si);
3066 }
3067
3068 QTextItemInt::QTextItemInt(const QGlyphLayout &g, QFont *font, const QChar *chars_, int numChars, QFontEngine *fe, const QTextCharFormat &format)
3069     : flags(0), justified(false), underlineStyle(QTextCharFormat::NoUnderline), charFormat(format),
3070       num_chars(numChars), chars(chars_), logClusters(0), f(font),  glyphs(g), fontEngine(fe)
3071 {
3072 }
3073
3074 // Fix up flags and underlineStyle with given info
3075 void QTextItemInt::initWithScriptItem(const QScriptItem &si)
3076 {
3077     // explicitly initialize flags so that initFontAttributes can be called
3078     // multiple times on the same TextItem
3079     flags = 0;
3080     if (si.analysis.bidiLevel %2)
3081         flags |= QTextItem::RightToLeft;
3082     ascent = si.ascent;
3083     descent = si.descent;
3084
3085     if (charFormat.hasProperty(QTextFormat::TextUnderlineStyle)) {
3086         underlineStyle = charFormat.underlineStyle();
3087     } else if (charFormat.boolProperty(QTextFormat::FontUnderline)
3088                || f->d->underline) {
3089         underlineStyle = QTextCharFormat::SingleUnderline;
3090     }
3091
3092     // compat
3093     if (underlineStyle == QTextCharFormat::SingleUnderline)
3094         flags |= QTextItem::Underline;
3095
3096     if (f->d->overline || charFormat.fontOverline())
3097         flags |= QTextItem::Overline;
3098     if (f->d->strikeOut || charFormat.fontStrikeOut())
3099         flags |= QTextItem::StrikeOut;
3100 }
3101
3102 QTextItemInt QTextItemInt::midItem(QFontEngine *fontEngine, int firstGlyphIndex, int numGlyphs) const
3103 {
3104     QTextItemInt ti = *this;
3105     const int end = firstGlyphIndex + numGlyphs;
3106     ti.glyphs = glyphs.mid(firstGlyphIndex, numGlyphs);
3107     ti.fontEngine = fontEngine;
3108
3109     if (logClusters && chars) {
3110         const int logClusterOffset = logClusters[0];
3111         while (logClusters[ti.chars - chars] - logClusterOffset < firstGlyphIndex)
3112             ++ti.chars;
3113
3114         ti.logClusters += (ti.chars - chars);
3115
3116         ti.num_chars = 0;
3117         int char_start = ti.chars - chars;
3118         while (char_start + ti.num_chars < num_chars && ti.logClusters[ti.num_chars] - logClusterOffset < end)
3119             ++ti.num_chars;
3120     }
3121     return ti;
3122 }
3123
3124
3125 QTransform qt_true_matrix(qreal w, qreal h, QTransform x)
3126 {
3127     QRectF rect = x.mapRect(QRectF(0, 0, w, h));
3128     return x * QTransform::fromTranslate(-rect.x(), -rect.y());
3129 }
3130
3131
3132 glyph_metrics_t glyph_metrics_t::transformed(const QTransform &matrix) const
3133 {
3134     if (matrix.type() < QTransform::TxTranslate)
3135         return *this;
3136
3137     glyph_metrics_t m = *this;
3138
3139     qreal w = width.toReal();
3140     qreal h = height.toReal();
3141     QTransform xform = qt_true_matrix(w, h, matrix);
3142
3143     QRectF rect(0, 0, w, h);
3144     rect = xform.mapRect(rect);
3145     m.width = QFixed::fromReal(rect.width());
3146     m.height = QFixed::fromReal(rect.height());
3147
3148     QLineF l = xform.map(QLineF(x.toReal(), y.toReal(), xoff.toReal(), yoff.toReal()));
3149
3150     m.x = QFixed::fromReal(l.x1());
3151     m.y = QFixed::fromReal(l.y1());
3152
3153     // The offset is relative to the baseline which is why we use dx/dy of the line
3154     m.xoff = QFixed::fromReal(l.dx());
3155     m.yoff = QFixed::fromReal(l.dy());
3156
3157     return m;
3158 }
3159
3160 QTextLineItemIterator::QTextLineItemIterator(QTextEngine *_eng, int _lineNum, const QPointF &pos,
3161                                              const QTextLayout::FormatRange *_selection)
3162     : eng(_eng),
3163       line(eng->lines[_lineNum]),
3164       si(0),
3165       lineNum(_lineNum),
3166       lineEnd(line.from + line.length),
3167       firstItem(eng->findItem(line.from)),
3168       lastItem(eng->findItem(lineEnd - 1)),
3169       nItems((firstItem >= 0 && lastItem >= firstItem)? (lastItem-firstItem+1) : 0),
3170       logicalItem(-1),
3171       item(-1),
3172       visualOrder(nItems),
3173       levels(nItems),
3174       selection(_selection)
3175 {
3176     pos_x = x = QFixed::fromReal(pos.x());
3177
3178     x += line.x;
3179
3180     x += eng->alignLine(line);
3181
3182     for (int i = 0; i < nItems; ++i)
3183         levels[i] = eng->layoutData->items[i+firstItem].analysis.bidiLevel;
3184     QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data());
3185
3186     eng->shapeLine(line);
3187 }
3188
3189 QScriptItem &QTextLineItemIterator::next()
3190 {
3191     x += itemWidth;
3192
3193     ++logicalItem;
3194     item = visualOrder[logicalItem] + firstItem;
3195     itemLength = eng->length(item);
3196     si = &eng->layoutData->items[item];
3197     if (!si->num_glyphs)
3198         eng->shape(item);
3199
3200     if (si->analysis.flags >= QScriptAnalysis::TabOrObject) {
3201         itemWidth = si->width;
3202         return *si;
3203     }
3204
3205     unsigned short *logClusters = eng->logClusters(si);
3206     QGlyphLayout glyphs = eng->shapedGlyphs(si);
3207
3208     itemStart = qMax(line.from, si->position);
3209     glyphsStart = logClusters[itemStart - si->position];
3210     if (lineEnd < si->position + itemLength) {
3211         itemEnd = lineEnd;
3212         glyphsEnd = logClusters[itemEnd-si->position];
3213     } else {
3214         itemEnd = si->position + itemLength;
3215         glyphsEnd = si->num_glyphs;
3216     }
3217     // show soft-hyphen at line-break
3218     if (si->position + itemLength >= lineEnd
3219         && eng->layoutData->string.at(lineEnd - 1) == 0x00ad)
3220         glyphs.attributes[glyphsEnd - 1].dontPrint = false;
3221
3222     itemWidth = 0;
3223     for (int g = glyphsStart; g < glyphsEnd; ++g)
3224         itemWidth += glyphs.effectiveAdvance(g);
3225
3226     return *si;
3227 }
3228
3229 bool QTextLineItemIterator::getSelectionBounds(QFixed *selectionX, QFixed *selectionWidth) const
3230 {
3231     *selectionX = *selectionWidth = 0;
3232
3233     if (!selection)
3234         return false;
3235
3236     if (si->analysis.flags >= QScriptAnalysis::TabOrObject) {
3237         if (si->position >= selection->start + selection->length
3238             || si->position + itemLength <= selection->start)
3239             return false;
3240
3241         *selectionX = x;
3242         *selectionWidth = itemWidth;
3243     } else {
3244         unsigned short *logClusters = eng->logClusters(si);
3245         QGlyphLayout glyphs = eng->shapedGlyphs(si);
3246
3247         int from = qMax(itemStart, selection->start) - si->position;
3248         int to = qMin(itemEnd, selection->start + selection->length) - si->position;
3249         if (from >= to)
3250             return false;
3251
3252         int start_glyph = logClusters[from];
3253         int end_glyph = (to == eng->length(item)) ? si->num_glyphs : logClusters[to];
3254         QFixed soff;
3255         QFixed swidth;
3256         if (si->analysis.bidiLevel %2) {
3257             for (int g = glyphsEnd - 1; g >= end_glyph; --g)
3258                 soff += glyphs.effectiveAdvance(g);
3259             for (int g = end_glyph - 1; g >= start_glyph; --g)
3260                 swidth += glyphs.effectiveAdvance(g);
3261         } else {
3262             for (int g = glyphsStart; g < start_glyph; ++g)
3263                 soff += glyphs.effectiveAdvance(g);
3264             for (int g = start_glyph; g < end_glyph; ++g)
3265                 swidth += glyphs.effectiveAdvance(g);
3266         }
3267
3268         // If the starting character is in the middle of a ligature,
3269         // selection should only contain the right part of that ligature
3270         // glyph, so we need to get the width of the left part here and
3271         // add it to *selectionX
3272         QFixed leftOffsetInLigature = eng->offsetInLigature(si, from, to, start_glyph);
3273         *selectionX = x + soff + leftOffsetInLigature;
3274         *selectionWidth = swidth - leftOffsetInLigature;
3275         // If the ending character is also part of a ligature, swidth does
3276         // not contain that part yet, we also need to find out the width of
3277         // that left part
3278         *selectionWidth += eng->offsetInLigature(si, to, eng->length(item), end_glyph);
3279     }
3280     return true;
3281 }
3282
3283 QT_END_NAMESPACE