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 <private/qunicodetools_p.h>
  56 #include "qtextdocument_p.h"
  57 #include "qrawfont.h"
  58 #include "qrawfont_p.h"
  59 #include <qguiapplication.h>
  60 #include <qinputmethod.h>
  61 #include <stdlib.h>
  62
  63 #include "qfontengine_qpa_p.h"
  64
  65 QT_BEGIN_NAMESPACE
  66
  67 static const float smallCapsFraction = 0.7f;
  68
  69 namespace {
  70 // Helper class used in QTextEngine::itemize
  71 // keep it out here to allow us to keep supporting various compilers.
  72 class Itemizer {
  73 public:
  74     Itemizer(const QString &string, const QScriptAnalysis *analysis, QScriptItemArray &items)
  75         : m_string(string),
  76         m_analysis(analysis),
  77         m_items(items),
  78         m_splitter(0)
  79     {
  80     }
  81     ~Itemizer()
  82     {
  83         delete m_splitter;
  84     }
  85
  86     /// generate the script items
  87     /// The caps parameter is used to choose the algoritm of splitting text and assiging roles to the textitems
  88     void generate(int start, int length, QFont::Capitalization caps)
  89     {
  90         if ((int)caps == (int)QFont::SmallCaps)
  91             generateScriptItemsSmallCaps(reinterpret_cast<const ushort *>(m_string.unicode()), start, length);
  92         else if(caps == QFont::Capitalize)
  93             generateScriptItemsCapitalize(start, length);
  94         else if(caps != QFont::MixedCase) {
  95             generateScriptItemsAndChangeCase(start, length,
  96                 caps == QFont::AllLowercase ? QScriptAnalysis::Lowercase : QScriptAnalysis::Uppercase);
  97         }
  98         else
  99             generateScriptItems(start, length);
 100     }
 101
 102 private:
 103     enum { MaxItemLength = 4096 };
 104
 105     void generateScriptItemsAndChangeCase(int start, int length, QScriptAnalysis::Flags flags)
 106     {
 107         generateScriptItems(start, length);
 108         if (m_items.isEmpty()) // the next loop won't work in that case
 109             return;
 110         QScriptItemArray::Iterator iter = m_items.end();
 111         do {
 112             iter--;
 113             if (iter->analysis.flags < QScriptAnalysis::TabOrObject)
 114                 iter->analysis.flags = flags;
 115         } while (iter->position > start);
 116     }
 117
 118     void generateScriptItems(int start, int length)
 119     {
 120         if (!length)
 121             return;
 122         const int end = start + length;
 123         for (int i = start + 1; i < end; ++i) {
 124             // According to the unicode spec we should be treating characters in the Common script
 125             // (punctuation, spaces, etc) as being the same script as the surrounding text for the
 126             // purpose of splitting up text. This is important because, for example, a fullstop
 127             // (0x2E) can be used to indicate an abbreviation and so must be treated as part of a
 128             // word.  Thus it must be passed along with the word in languages that have to calculate
 129             // word breaks.  For example the thai word "ครม." has no word breaks but the word "ครม"
 130             // does.
 131             // Unfortuntely because we split up the strings for both wordwrapping and for setting
 132             // the font and because Japanese and Chinese are also aliases of the script "Common",
 133             // doing this would break too many things.  So instead we only pass the full stop
 134             // along, and nothing else.
 135             if (m_analysis[i].bidiLevel == m_analysis[start].bidiLevel
 136                 && m_analysis[i].flags == m_analysis[start].flags
 137                 && (m_analysis[i].script == m_analysis[start].script || m_string[i] == QLatin1Char('.'))
 138                 && m_analysis[i].flags < QScriptAnalysis::SpaceTabOrObject
 139                 && i - start < MaxItemLength)
 140                 continue;
 141             m_items.append(QScriptItem(start, m_analysis[start]));
 142             start = i;
 143         }
 144         m_items.append(QScriptItem(start, m_analysis[start]));
 145     }
 146
 147     void generateScriptItemsCapitalize(int start, int length)
 148     {
 149         if (!length)
 150             return;
 151
 152         if (!m_splitter)
 153             m_splitter = new QTextBoundaryFinder(QTextBoundaryFinder::Word,
 154                                                  m_string.constData(), m_string.length(),
 155                                                  /*buffer*/0, /*buffer size*/0);
 156
 157         m_splitter->setPosition(start);
 158         QScriptAnalysis itemAnalysis = m_analysis[start];
 159
 160         if (m_splitter->boundaryReasons() & QTextBoundaryFinder::StartWord) {
 161             itemAnalysis.flags = QScriptAnalysis::Uppercase;
 162             m_splitter->toNextBoundary();
 163         }
 164
 165         const int end = start + length;
 166         for (int i = start + 1; i < end; ++i) {
 167
 168             bool atWordBoundary = false;
 169
 170             if (i == m_splitter->position()) {
 171                 if (m_splitter->boundaryReasons() & QTextBoundaryFinder::StartWord
 172                     && m_analysis[i].flags < QScriptAnalysis::TabOrObject)
 173                     atWordBoundary = true;
 174
 175                 m_splitter->toNextBoundary();
 176             }
 177
 178             if (m_analysis[i] == itemAnalysis
 179                 && m_analysis[i].flags < QScriptAnalysis::TabOrObject
 180                 && !atWordBoundary
 181                 && i - start < MaxItemLength)
 182                 continue;
 183
 184             m_items.append(QScriptItem(start, itemAnalysis));
 185             start = i;
 186             itemAnalysis = m_analysis[start];
 187
 188             if (atWordBoundary)
 189                 itemAnalysis.flags = QScriptAnalysis::Uppercase;
 190         }
 191         m_items.append(QScriptItem(start, itemAnalysis));
 192     }
 193
 194     void generateScriptItemsSmallCaps(const ushort *uc, int start, int length)
 195     {
 196         if (!length)
 197             return;
 198         bool lower = (QChar::category(uc[start]) == QChar::Letter_Lowercase);
 199         const int end = start + length;
 200         // split text into parts that are already uppercase and parts that are lowercase, and mark the latter to be uppercased later.
 201         for (int i = start + 1; i < end; ++i) {
 202             bool l = (QChar::category(uc[i]) == QChar::Letter_Lowercase);
 203             if ((m_analysis[i] == m_analysis[start])
 204                 && m_analysis[i].flags < QScriptAnalysis::TabOrObject
 205                 && l == lower
 206                 && i - start < MaxItemLength)
 207                 continue;
 208             m_items.append(QScriptItem(start, m_analysis[start]));
 209             if (lower)
 210                 m_items.last().analysis.flags = QScriptAnalysis::SmallCaps;
 211
 212             start = i;
 213             lower = l;
 214         }
 215         m_items.append(QScriptItem(start, m_analysis[start]));
 216         if (lower)
 217             m_items.last().analysis.flags = QScriptAnalysis::SmallCaps;
 218     }
 219
 220     const QString &m_string;
 221     const QScriptAnalysis * const m_analysis;
 222     QScriptItemArray &m_items;
 223     QTextBoundaryFinder *m_splitter;
 224 };
 225 }
 226
 227
 228 // ----------------------------------------------------------------------------
 229 //
 230 // The BiDi algorithm
 231 //
 232 // ----------------------------------------------------------------------------
 233
 234 #define BIDI_DEBUG 0
 235 #if (BIDI_DEBUG >= 1)
 236 QT_BEGIN_INCLUDE_NAMESPACE
 237 #include <iostream>
 238 QT_END_INCLUDE_NAMESPACE
 239 using namespace std;
 240
 241 static const char *directions[] = {
 242     "DirL", "DirR", "DirEN", "DirES", "DirET", "DirAN", "DirCS", "DirB", "DirS", "DirWS", "DirON",
 243     "DirLRE", "DirLRO", "DirAL", "DirRLE", "DirRLO", "DirPDF", "DirNSM", "DirBN"
 244 };
 245
 246 #endif
 247
 248 struct QBidiStatus {
 249     QBidiStatus() {
 250         eor = QChar::DirON;
 251         lastStrong = QChar::DirON;
 252         last = QChar:: DirON;
 253         dir = QChar::DirON;
 254     }
 255     QChar::Direction eor;
 256     QChar::Direction lastStrong;
 257     QChar::Direction last;
 258     QChar::Direction dir;
 259 };
 260
 261 enum { MaxBidiLevel = 61 };
 262
 263 struct QBidiControl {
 264     inline QBidiControl(bool rtl)
 265         : cCtx(0), base(rtl ? 1 : 0), level(rtl ? 1 : 0), override(false) {}
 266
 267     inline void embed(bool rtl, bool o = false) {
 268         unsigned int toAdd = 1;
 269         if((level%2 != 0) == rtl ) {
 270             ++toAdd;
 271         }
 272         if (level + toAdd <= MaxBidiLevel) {
 273             ctx[cCtx].level = level;
 274             ctx[cCtx].override = override;
 275             cCtx++;
 276             override = o;
 277             level += toAdd;
 278         }
 279     }
 280     inline bool canPop() const { return cCtx != 0; }
 281     inline void pdf() {
 282         Q_ASSERT(cCtx);
 283         --cCtx;
 284         level = ctx[cCtx].level;
 285         override = ctx[cCtx].override;
 286     }
 287
 288     inline QChar::Direction basicDirection() const {
 289         return (base ? QChar::DirR : QChar:: DirL);
 290     }
 291     inline unsigned int baseLevel() const {
 292         return base;
 293     }
 294     inline QChar::Direction direction() const {
 295         return ((level%2) ? QChar::DirR : QChar:: DirL);
 296     }
 297
 298     struct {
 299         unsigned int level;
 300         bool override;
 301     } ctx[MaxBidiLevel];
 302     unsigned int cCtx;
 303     const unsigned int base;
 304     unsigned int level;
 305     bool override;
 306 };
 307
 308
 309 static void appendItems(QScriptAnalysis *analysis, int &start, int &stop, const QBidiControl &control, QChar::Direction dir)
 310 {
 311     if (start > stop)
 312         return;
 313
 314     int level = control.level;
 315
 316     if(dir != QChar::DirON && !control.override) {
 317         // add level of run (cases I1 & I2)
 318         if(level % 2) {
 319             if(dir == QChar::DirL || dir == QChar::DirAN || dir == QChar::DirEN)
 320                 level++;
 321         } else {
 322             if(dir == QChar::DirR)
 323                 level++;
 324             else if(dir == QChar::DirAN || dir == QChar::DirEN)
 325                 level += 2;
 326         }
 327     }
 328
 329 #if (BIDI_DEBUG >= 1)
 330     qDebug("new run: dir=%s from %d, to %d level = %d override=%d", directions[dir], start, stop, level, control.override);
 331 #endif
 332     QScriptAnalysis *s = analysis + start;
 333     const QScriptAnalysis *e = analysis + stop;
 334     while (s <= e) {
 335         s->bidiLevel = level;
 336         ++s;
 337     }
 338     ++stop;
 339     start = stop;
 340 }
 341
 342 static QChar::Direction skipBoundryNeutrals(QScriptAnalysis *analysis,
 343                                             const ushort *unicode, int length,
 344                                             int &sor, int &eor, QBidiControl &control)
 345 {
 346     QChar::Direction dir = control.basicDirection();
 347     int level = sor > 0 ? analysis[sor - 1].bidiLevel : control.level;
 348     while (sor < length) {
 349         dir = QChar::direction(unicode[sor]);
 350         // Keep skipping DirBN as if it doesn't exist
 351         if (dir != QChar::DirBN)
 352             break;
 353         analysis[sor++].bidiLevel = level;
 354     }
 355
 356     eor = sor;
 357     if (eor == length)
 358         dir = control.basicDirection();
 359
 360     return dir;
 361 }
 362
 363 // creates the next QScript items.
 364 static bool bidiItemize(QTextEngine *engine, QScriptAnalysis *analysis, QBidiControl &control)
 365 {
 366     bool rightToLeft = (control.basicDirection() == 1);
 367     bool hasBidi = rightToLeft;
 368 #if BIDI_DEBUG >= 2
 369     qDebug() << "bidiItemize: rightToLeft=" << rightToLeft << engine->layoutData->string;
 370 #endif
 371
 372     int sor = 0;
 373     int eor = -1;
 374
 375
 376     int length = engine->layoutData->string.length();
 377
 378     const ushort *unicode = (const ushort *)engine->layoutData->string.unicode();
 379     int current = 0;
 380
 381     QChar::Direction dir = rightToLeft ? QChar::DirR : QChar::DirL;
 382     QBidiStatus status;
 383
 384     QChar::Direction sdir = QChar::direction(*unicode);
 385     if (sdir != QChar::DirL && sdir != QChar::DirR && sdir != QChar::DirEN && sdir != QChar::DirAN)
 386         sdir = QChar::DirON;
 387     else
 388         dir = QChar::DirON;
 389     status.eor = sdir;
 390     status.lastStrong = rightToLeft ? QChar::DirR : QChar::DirL;
 391     status.last = status.lastStrong;
 392     status.dir = sdir;
 393
 394
 395     while (current <= length) {
 396
 397         QChar::Direction dirCurrent;
 398         if (current == (int)length)
 399             dirCurrent = control.basicDirection();
 400         else
 401             dirCurrent = QChar::direction(unicode[current]);
 402
 403 #if (BIDI_DEBUG >= 2)
 404 //         qDebug() << "pos=" << current << " dir=" << directions[dir]
 405 //                  << " current=" << directions[dirCurrent] << " last=" << directions[status.last]
 406 //                  << " eor=" << eor << '/' << directions[status.eor]
 407 //                  << " sor=" << sor << " lastStrong="
 408 //                  << directions[status.lastStrong]
 409 //                  << " level=" << (int)control.level << " override=" << (bool)control.override;
 410 #endif
 411
 412         switch(dirCurrent) {
 413
 414             // embedding and overrides (X1-X9 in the BiDi specs)
 415         case QChar::DirRLE:
 416         case QChar::DirRLO:
 417         case QChar::DirLRE:
 418         case QChar::DirLRO:
 419             {
 420                 bool rtl = (dirCurrent == QChar::DirRLE || dirCurrent == QChar::DirRLO);
 421                 hasBidi |= rtl;
 422                 bool override = (dirCurrent == QChar::DirLRO || dirCurrent == QChar::DirRLO);
 423
 424                 unsigned int level = control.level+1;
 425                 if ((level%2 != 0) == rtl) ++level;
 426                 if(level < MaxBidiLevel) {
 427                     eor = current-1;
 428                     appendItems(analysis, sor, eor, control, dir);
 429                     eor = current;
 430                     control.embed(rtl, override);
 431                     QChar::Direction edir = (rtl ? QChar::DirR : QChar::DirL);
 432                     dir = status.eor = edir;
 433                     status.lastStrong = edir;
 434                 }
 435                 break;
 436             }
 437         case QChar::DirPDF:
 438             {
 439                 if (control.canPop()) {
 440                     if (dir != control.direction()) {
 441                         eor = current-1;
 442                         appendItems(analysis, sor, eor, control, dir);
 443                         dir = control.direction();
 444                     }
 445                     eor = current;
 446                     appendItems(analysis, sor, eor, control, dir);
 447                     control.pdf();
 448                     dir = QChar::DirON; status.eor = QChar::DirON;
 449                     status.last = control.direction();
 450                     if (control.override)
 451                         dir = control.direction();
 452                     else
 453                         dir = QChar::DirON;
 454                     status.lastStrong = control.direction();
 455                 }
 456                 break;
 457             }
 458
 459             // strong types
 460         case QChar::DirL:
 461             if(dir == QChar::DirON)
 462                 dir = QChar::DirL;
 463             switch(status.last)
 464                 {
 465                 case QChar::DirL:
 466                     eor = current; status.eor = QChar::DirL; break;
 467                 case QChar::DirR:
 468                 case QChar::DirAL:
 469                 case QChar::DirEN:
 470                 case QChar::DirAN:
 471                     if (eor >= 0) {
 472                         appendItems(analysis, sor, eor, control, dir);
 473                         status.eor = dir = skipBoundryNeutrals(analysis, unicode, length, sor, eor, control);
 474                     } else {
 475                         eor = current; status.eor = dir;
 476                     }
 477                     break;
 478                 case QChar::DirES:
 479                 case QChar::DirET:
 480                 case QChar::DirCS:
 481                 case QChar::DirBN:
 482                 case QChar::DirB:
 483                 case QChar::DirS:
 484                 case QChar::DirWS:
 485                 case QChar::DirON:
 486                     if(dir != QChar::DirL) {
 487                         //last stuff takes embedding dir
 488                         if(control.direction() == QChar::DirR) {
 489                             if(status.eor != QChar::DirR) {
 490                                 // AN or EN
 491                                 appendItems(analysis, sor, eor, control, dir);
 492                                 status.eor = QChar::DirON;
 493                                 dir = QChar::DirR;
 494                             }
 495                             eor = current - 1;
 496                             appendItems(analysis, sor, eor, control, dir);
 497                             status.eor = dir = skipBoundryNeutrals(analysis, unicode, length, sor, eor, control);
 498                         } else {
 499                             if(status.eor != QChar::DirL) {
 500                                 appendItems(analysis, sor, eor, control, dir);
 501                                 status.eor = QChar::DirON;
 502                                 dir = QChar::DirL;
 503                             } else {
 504                                 eor = current; status.eor = QChar::DirL; break;
 505                             }
 506                         }
 507                     } else {
 508                         eor = current; status.eor = QChar::DirL;
 509                     }
 510                 default:
 511                     break;
 512                 }
 513             status.lastStrong = QChar::DirL;
 514             break;
 515         case QChar::DirAL:
 516         case QChar::DirR:
 517             hasBidi = true;
 518             if(dir == QChar::DirON) dir = QChar::DirR;
 519             switch(status.last)
 520                 {
 521                 case QChar::DirL:
 522                 case QChar::DirEN:
 523                 case QChar::DirAN:
 524                     if (eor >= 0)
 525                         appendItems(analysis, sor, eor, control, dir);
 526                     // fall through
 527                 case QChar::DirR:
 528                 case QChar::DirAL:
 529                     dir = QChar::DirR; eor = current; status.eor = QChar::DirR; break;
 530                 case QChar::DirES:
 531                 case QChar::DirET:
 532                 case QChar::DirCS:
 533                 case QChar::DirBN:
 534                 case QChar::DirB:
 535                 case QChar::DirS:
 536                 case QChar::DirWS:
 537                 case QChar::DirON:
 538                     if(status.eor != QChar::DirR && status.eor != QChar::DirAL) {
 539                         //last stuff takes embedding dir
 540                         if(control.direction() == QChar::DirR
 541                            || status.lastStrong == QChar::DirR || status.lastStrong == QChar::DirAL) {
 542                             appendItems(analysis, sor, eor, control, dir);
 543                             dir = QChar::DirR; status.eor = QChar::DirON;
 544                             eor = current;
 545                         } else {
 546                             eor = current - 1;
 547                             appendItems(analysis, sor, eor, control, dir);
 548                             dir = QChar::DirR; status.eor = QChar::DirON;
 549                         }
 550                     } else {
 551                         eor = current; status.eor = QChar::DirR;
 552                     }
 553                 default:
 554                     break;
 555                 }
 556             status.lastStrong = dirCurrent;
 557             break;
 558
 559             // weak types:
 560
 561         case QChar::DirNSM:
 562             if (eor == current-1)
 563                 eor = current;
 564             break;
 565         case QChar::DirEN:
 566             // if last strong was AL change EN to AN
 567             if(status.lastStrong != QChar::DirAL) {
 568                 if(dir == QChar::DirON) {
 569                     if(status.lastStrong == QChar::DirL)
 570                         dir = QChar::DirL;
 571                     else
 572                         dir = QChar::DirEN;
 573                 }
 574                 switch(status.last)
 575                     {
 576                     case QChar::DirET:
 577                         if (status.lastStrong == QChar::DirR || status.lastStrong == QChar::DirAL) {
 578                             appendItems(analysis, sor, eor, control, dir);
 579                             status.eor = QChar::DirON;
 580                             dir = QChar::DirAN;
 581                         }
 582                         // fall through
 583                     case QChar::DirEN:
 584                     case QChar::DirL:
 585                         eor = current;
 586                         status.eor = dirCurrent;
 587                         break;
 588                     case QChar::DirR:
 589                     case QChar::DirAL:
 590                     case QChar::DirAN:
 591                         if (eor >= 0)
 592                             appendItems(analysis, sor, eor, control, dir);
 593                         else
 594                             eor = current;
 595                         status.eor = QChar::DirEN;
 596                         dir = QChar::DirAN; break;
 597                     case QChar::DirES:
 598                     case QChar::DirCS:
 599                         if(status.eor == QChar::DirEN || dir == QChar::DirAN) {
 600                             eor = current; break;
 601                         }
 602                     case QChar::DirBN:
 603                     case QChar::DirB:
 604                     case QChar::DirS:
 605                     case QChar::DirWS:
 606                     case QChar::DirON:
 607                         if(status.eor == QChar::DirR) {
 608                             // neutrals go to R
 609                             eor = current - 1;
 610                             appendItems(analysis, sor, eor, control, dir);
 611                             dir = QChar::DirON; status.eor = QChar::DirEN;
 612                             dir = QChar::DirAN;
 613                         }
 614                         else if(status.eor == QChar::DirL ||
 615                                  (status.eor == QChar::DirEN && status.lastStrong == QChar::DirL)) {
 616                             eor = current; status.eor = dirCurrent;
 617                         } else {
 618                             // numbers on both sides, neutrals get right to left direction
 619                             if(dir != QChar::DirL) {
 620                                 appendItems(analysis, sor, eor, control, dir);
 621                                 dir = QChar::DirON; status.eor = QChar::DirON;
 622                                 eor = current - 1;
 623                                 dir = QChar::DirR;
 624                                 appendItems(analysis, sor, eor, control, dir);
 625                                 dir = QChar::DirON; status.eor = QChar::DirON;
 626                                 dir = QChar::DirAN;
 627                             } else {
 628                                 eor = current; status.eor = dirCurrent;
 629                             }
 630                         }
 631                     default:
 632                         break;
 633                     }
 634                 break;
 635             }
 636         case QChar::DirAN:
 637             hasBidi = true;
 638             dirCurrent = QChar::DirAN;
 639             if(dir == QChar::DirON) dir = QChar::DirAN;
 640             switch(status.last)
 641                 {
 642                 case QChar::DirL:
 643                 case QChar::DirAN:
 644                     eor = current; status.eor = QChar::DirAN; break;
 645                 case QChar::DirR:
 646                 case QChar::DirAL:
 647                 case QChar::DirEN:
 648                     if (eor >= 0){
 649                         appendItems(analysis, sor, eor, control, dir);
 650                     } else {
 651                         eor = current;
 652                     }
 653                     dir = QChar::DirAN; status.eor = QChar::DirAN;
 654                     break;
 655                 case QChar::DirCS:
 656                     if(status.eor == QChar::DirAN) {
 657                         eor = current; break;
 658                     }
 659                 case QChar::DirES:
 660                 case QChar::DirET:
 661                 case QChar::DirBN:
 662                 case QChar::DirB:
 663                 case QChar::DirS:
 664                 case QChar::DirWS:
 665                 case QChar::DirON:
 666                     if(status.eor == QChar::DirR) {
 667                         // neutrals go to R
 668                         eor = current - 1;
 669                         appendItems(analysis, sor, eor, control, dir);
 670                         status.eor = QChar::DirAN;
 671                         dir = QChar::DirAN;
 672                     } else if(status.eor == QChar::DirL ||
 673                                (status.eor == QChar::DirEN && status.lastStrong == QChar::DirL)) {
 674                         eor = current; status.eor = dirCurrent;
 675                     } else {
 676                         // numbers on both sides, neutrals get right to left direction
 677                         if(dir != QChar::DirL) {
 678                             appendItems(analysis, sor, eor, control, dir);
 679                             status.eor = QChar::DirON;
 680                             eor = current - 1;
 681                             dir = QChar::DirR;
 682                             appendItems(analysis, sor, eor, control, dir);
 683                             status.eor = QChar::DirAN;
 684                             dir = QChar::DirAN;
 685                         } else {
 686                             eor = current; status.eor = dirCurrent;
 687                         }
 688                     }
 689                 default:
 690                     break;
 691                 }
 692             break;
 693         case QChar::DirES:
 694         case QChar::DirCS:
 695             break;
 696         case QChar::DirET:
 697             if(status.last == QChar::DirEN) {
 698                 dirCurrent = QChar::DirEN;
 699                 eor = current; status.eor = dirCurrent;
 700             }
 701             break;
 702
 703             // boundary neutrals should be ignored
 704         case QChar::DirBN:
 705             break;
 706             // neutrals
 707         case QChar::DirB:
 708             // ### what do we do with newline and paragraph separators that come to here?
 709             break;
 710         case QChar::DirS:
 711             // ### implement rule L1
 712             break;
 713         case QChar::DirWS:
 714         case QChar::DirON:
 715             break;
 716         default:
 717             break;
 718         }
 719
 720         //qDebug() << "     after: dir=" << //        dir << " current=" << dirCurrent << " last=" << status.last << " eor=" << status.eor << " lastStrong=" << status.lastStrong << " embedding=" << control.direction();
 721
 722         if(current >= (int)length) break;
 723
 724         // set status.last as needed.
 725         switch(dirCurrent) {
 726         case QChar::DirET:
 727         case QChar::DirES:
 728         case QChar::DirCS:
 729         case QChar::DirS:
 730         case QChar::DirWS:
 731         case QChar::DirON:
 732             switch(status.last)
 733             {
 734             case QChar::DirL:
 735             case QChar::DirR:
 736             case QChar::DirAL:
 737             case QChar::DirEN:
 738             case QChar::DirAN:
 739                 status.last = dirCurrent;
 740                 break;
 741             default:
 742                 status.last = QChar::DirON;
 743             }
 744             break;
 745         case QChar::DirNSM:
 746         case QChar::DirBN:
 747             // ignore these
 748             break;
 749         case QChar::DirLRO:
 750         case QChar::DirLRE:
 751             status.last = QChar::DirL;
 752             break;
 753         case QChar::DirRLO:
 754         case QChar::DirRLE:
 755             status.last = QChar::DirR;
 756             break;
 757         case QChar::DirEN:
 758             if (status.last == QChar::DirL) {
 759                 status.last = QChar::DirL;
 760                 break;
 761             }
 762             // fall through
 763         default:
 764             status.last = dirCurrent;
 765         }
 766
 767         ++current;
 768     }
 769
 770 #if (BIDI_DEBUG >= 1)
 771     qDebug() << "reached end of line current=" << current << ", eor=" << eor;
 772 #endif
 773     eor = current - 1; // remove dummy char
 774
 775     if (sor <= eor)
 776         appendItems(analysis, sor, eor, control, dir);
 777
 778     return hasBidi;
 779 }
 780
 781 void QTextEngine::bidiReorder(int numItems, const quint8 *levels, int *visualOrder)
 782 {
 783
 784     // first find highest and lowest levels
 785     quint8 levelLow = 128;
 786     quint8 levelHigh = 0;
 787     int i = 0;
 788     while (i < numItems) {
 789         //printf("level = %d\n", r->level);
 790         if (levels[i] > levelHigh)
 791             levelHigh = levels[i];
 792         if (levels[i] < levelLow)
 793             levelLow = levels[i];
 794         i++;
 795     }
 796
 797     // implements reordering of the line (L2 according to BiDi spec):
 798     // L2. From the highest level found in the text to the lowest odd level on each line,
 799     // reverse any contiguous sequence of characters that are at that level or higher.
 800
 801     // reversing is only done up to the lowest odd level
 802     if(!(levelLow%2)) levelLow++;
 803
 804 #if (BIDI_DEBUG >= 1)
 805 //     qDebug() << "reorderLine: lineLow = " << (uint)levelLow << ", lineHigh = " << (uint)levelHigh;
 806 #endif
 807
 808     int count = numItems - 1;
 809     for (i = 0; i < numItems; i++)
 810         visualOrder[i] = i;
 811
 812     while(levelHigh >= levelLow) {
 813         int i = 0;
 814         while (i < count) {
 815             while(i < count && levels[i] < levelHigh) i++;
 816             int start = i;
 817             while(i <= count && levels[i] >= levelHigh) i++;
 818             int end = i-1;
 819
 820             if(start != end) {
 821                 //qDebug() << "reversing from " << start << " to " << end;
 822                 for(int j = 0; j < (end-start+1)/2; j++) {
 823                     int tmp = visualOrder[start+j];
 824                     visualOrder[start+j] = visualOrder[end-j];
 825                     visualOrder[end-j] = tmp;
 826                 }
 827             }
 828             i++;
 829         }
 830         levelHigh--;
 831     }
 832
 833 #if (BIDI_DEBUG >= 1)
 834 //     qDebug() << "visual order is:";
 835 //     for (i = 0; i < numItems; i++)
 836 //         qDebug() << visualOrder[i];
 837 #endif
 838 }
 839
 840 QT_BEGIN_INCLUDE_NAMESPACE
 841
 842
 843 #include <private/qharfbuzz_p.h>
 844
 845 QT_END_INCLUDE_NAMESPACE
 846
 847 // ask the font engine to find out which glyphs (as an index in the specific font) to use for the text in one item.
 848 static bool stringToGlyphs(HB_ShaperItem *item, QGlyphLayout *glyphs, QFontEngine *fontEngine)
 849 {
 850     int nGlyphs = item->num_glyphs;
 851
 852     QTextEngine::ShaperFlags shaperFlags(QTextEngine::GlyphIndicesOnly);
 853     if (item->item.bidiLevel % 2)
 854         shaperFlags |= QTextEngine::RightToLeft;
 855
 856     bool result = fontEngine->stringToCMap(reinterpret_cast<const QChar *>(item->string + item->item.pos), item->item.length, glyphs, &nGlyphs, shaperFlags);
 857     item->num_glyphs = nGlyphs;
 858     glyphs->numGlyphs = nGlyphs;
 859     return result;
 860 }
 861
 862 // shape all the items that intersect with the line, taking tab widths into account to find out what text actually fits in the line.
 863 void QTextEngine::shapeLine(const QScriptLine &line)
 864 {
 865     QFixed x;
 866     bool first = true;
 867     const int end = findItem(line.from + line.length - 1);
 868     int item = findItem(line.from);
 869     if (item == -1)
 870         return;
 871     for (item = findItem(line.from); item <= end; ++item) {
 872         QScriptItem &si = layoutData->items[item];
 873         if (si.analysis.flags == QScriptAnalysis::Tab) {
 874             ensureSpace(1);
 875             si.width = calculateTabWidth(item, x);
 876         } else {
 877             shape(item);
 878         }
 879         if (first && si.position != line.from) { // that means our x position has to be offset
 880             QGlyphLayout glyphs = shapedGlyphs(&si);
 881             Q_ASSERT(line.from > si.position);
 882             for (int i = line.from - si.position - 1; i >= 0; i--) {
 883                 x -= glyphs.effectiveAdvance(i);
 884             }
 885         }
 886         first = false;
 887
 888         x += si.width;
 889     }
 890 }
 891
 892
 893 void QTextEngine::shapeText(int item) const
 894 {
 895     Q_ASSERT(item < layoutData->items.size());
 896     QScriptItem &si = layoutData->items[item];
 897
 898     if (si.num_glyphs)
 899         return;
 900
 901     shapeTextWithHarfbuzz(item);
 902
 903     si.width = 0;
 904
 905     if (!si.num_glyphs)
 906         return;
 907     QGlyphLayout glyphs = shapedGlyphs(&si);
 908
 909     bool letterSpacingIsAbsolute;
 910     QFixed letterSpacing, wordSpacing;
 911 #ifndef QT_NO_RAWFONT
 912     if (useRawFont) {
 913         QTextCharFormat f = format(&si);
 914         wordSpacing = QFixed::fromReal(f.fontWordSpacing());
 915         letterSpacing = QFixed::fromReal(f.fontLetterSpacing());
 916         letterSpacingIsAbsolute = true;
 917     } else
 918 #endif
 919     {
 920         QFont font = this->font(si);
 921         letterSpacingIsAbsolute = font.d->letterSpacingIsAbsolute;
 922         letterSpacing = font.d->letterSpacing;
 923         wordSpacing = font.d->wordSpacing;
 924
 925         if (letterSpacingIsAbsolute && letterSpacing.value())
 926             letterSpacing *= font.d->dpi / qt_defaultDpiY();
 927     }
 928
 929     if (letterSpacing != 0) {
 930         for (int i = 1; i < si.num_glyphs; ++i) {
 931             if (glyphs.attributes[i].clusterStart) {
 932                 if (letterSpacingIsAbsolute)
 933                     glyphs.advances_x[i-1] += letterSpacing;
 934                 else {
 935                     QFixed &advance = glyphs.advances_x[i-1];
 936                     advance += (letterSpacing - 100) * advance / 100;
 937                 }
 938             }
 939         }
 940         if (letterSpacingIsAbsolute)
 941             glyphs.advances_x[si.num_glyphs-1] += letterSpacing;
 942         else {
 943             QFixed &advance = glyphs.advances_x[si.num_glyphs-1];
 944             advance += (letterSpacing - 100) * advance / 100;
 945         }
 946     }
 947     if (wordSpacing != 0) {
 948         for (int i = 0; i < si.num_glyphs; ++i) {
 949             if (glyphs.attributes[i].justification == HB_Space
 950                 || glyphs.attributes[i].justification == HB_Arabic_Space) {
 951                 // word spacing only gets added once to a consecutive run of spaces (see CSS spec)
 952                 if (i + 1 == si.num_glyphs
 953                     ||(glyphs.attributes[i+1].justification != HB_Space
 954                        && glyphs.attributes[i+1].justification != HB_Arabic_Space))
 955                     glyphs.advances_x[i] += wordSpacing;
 956             }
 957         }
 958     }
 959
 960     for (int i = 0; i < si.num_glyphs; ++i)
 961         si.width += glyphs.advances_x[i] * !glyphs.attributes[i].dontPrint;
 962 }
 963
 964 static inline bool hasCaseChange(const QScriptItem &si)
 965 {
 966     return si.analysis.flags == QScriptAnalysis::SmallCaps ||
 967            si.analysis.flags == QScriptAnalysis::Uppercase ||
 968            si.analysis.flags == QScriptAnalysis::Lowercase;
 969 }
 970
 971
 972 static inline void moveGlyphData(const QGlyphLayout &destination, const QGlyphLayout &source, int num)
 973 {
 974     if (num > 0 && destination.glyphs != source.glyphs) {
 975         memmove(destination.glyphs, source.glyphs, num * sizeof(HB_Glyph));
 976         memmove(destination.attributes, source.attributes, num * sizeof(HB_GlyphAttributes));
 977         memmove(destination.advances_x, source.advances_x, num * sizeof(HB_Fixed));
 978         memmove(destination.offsets, source.offsets, num * sizeof(HB_FixedPoint));
 979     }
 980 }
 981
 982 /// take the item from layoutData->items and
 983 void QTextEngine::shapeTextWithHarfbuzz(int item) const
 984 {
 985     Q_ASSERT(sizeof(HB_Fixed) == sizeof(QFixed));
 986     Q_ASSERT(sizeof(HB_FixedPoint) == sizeof(QFixedPoint));
 987
 988     QScriptItem &si = layoutData->items[item];
 989
 990     si.glyph_data_offset = layoutData->used;
 991
 992     QFontEngine *font = fontEngine(si, &si.ascent, &si.descent, &si.leading);
 993
 994     bool kerningEnabled;
 995 #ifndef QT_NO_RAWFONT
 996     if (useRawFont) {
 997         QTextCharFormat f = format(&si);
 998         kerningEnabled = f.fontKerning();
 999     } else
1000 #endif
1001         kerningEnabled = this->font(si).d->kerning;
1002
1003     HB_ShaperItem entire_shaper_item;
1004     memset(&entire_shaper_item, 0, sizeof(entire_shaper_item));
1005     entire_shaper_item.string = reinterpret_cast<const HB_UChar16 *>(layoutData->string.constData());
1006     entire_shaper_item.stringLength = layoutData->string.length();
1007     entire_shaper_item.item.script = (HB_Script)si.analysis.script;
1008     entire_shaper_item.item.pos = si.position;
1009     entire_shaper_item.item.length = length(item);
1010     entire_shaper_item.item.bidiLevel = si.analysis.bidiLevel;
1011
1012     QVarLengthArray<HB_UChar16, 256> casedString;
1013     if (hasCaseChange(si)) {
1014         if (casedString.size() < static_cast<int>(entire_shaper_item.item.length))
1015             casedString.resize(entire_shaper_item.item.length);
1016         HB_UChar16 *uc = casedString.data();
1017         for (uint i = 0; i < entire_shaper_item.item.length; ++i) {
1018             if(si.analysis.flags == QScriptAnalysis::Lowercase)
1019                 uc[i] = QChar::toLower(entire_shaper_item.string[si.position + i]);
1020             else
1021                 uc[i] = QChar::toUpper(entire_shaper_item.string[si.position + i]);
1022         }
1023         entire_shaper_item.item.pos = 0;
1024         entire_shaper_item.string = uc;
1025         entire_shaper_item.stringLength = entire_shaper_item.item.length;
1026     }
1027
1028     entire_shaper_item.shaperFlags = 0;
1029     if (!kerningEnabled)
1030         entire_shaper_item.shaperFlags |= HB_ShaperFlag_NoKerning;
1031     if (option.useDesignMetrics())
1032         entire_shaper_item.shaperFlags |= HB_ShaperFlag_UseDesignMetrics;
1033
1034     entire_shaper_item.num_glyphs = qMax(layoutData->glyphLayout.numGlyphs - layoutData->used, int(entire_shaper_item.item.length));
1035     if (!ensureSpace(entire_shaper_item.num_glyphs))
1036         return;
1037     QGlyphLayout initialGlyphs = availableGlyphs(&si).mid(0, entire_shaper_item.num_glyphs);
1038
1039     if (!stringToGlyphs(&entire_shaper_item, &initialGlyphs, font)) {
1040         if (!ensureSpace(entire_shaper_item.num_glyphs))
1041             return;
1042         initialGlyphs = availableGlyphs(&si).mid(0, entire_shaper_item.num_glyphs);
1043         if (!stringToGlyphs(&entire_shaper_item, &initialGlyphs, font)) {
1044             // ############ if this happens there's a bug in the fontengine
1045             return;
1046         }
1047     }
1048
1049     // split up the item into parts that come from different font engines.
1050     QVarLengthArray<int> itemBoundaries(2);
1051     // k * 2 entries, array[k] == index in string, array[k + 1] == index in glyphs
1052     itemBoundaries[0] = entire_shaper_item.item.pos;
1053     itemBoundaries[1] = 0;
1054
1055     if (font->type() == QFontEngine::Multi) {
1056         uint lastEngine = 0;
1057         int charIdx = entire_shaper_item.item.pos;
1058         const int stringEnd = charIdx + entire_shaper_item.item.length;
1059         for (quint32 i = 0; i < entire_shaper_item.num_glyphs; ++i, ++charIdx) {
1060             uint engineIdx = initialGlyphs.glyphs[i] >> 24;
1061             if (engineIdx != lastEngine && i > 0) {
1062                 itemBoundaries.append(charIdx);
1063                 itemBoundaries.append(i);
1064             }
1065             lastEngine = engineIdx;
1066             if (HB_IsHighSurrogate(entire_shaper_item.string[charIdx])
1067                 && charIdx < stringEnd - 1
1068                 && HB_IsLowSurrogate(entire_shaper_item.string[charIdx + 1]))
1069                 ++charIdx;
1070         }
1071     }
1072
1073
1074
1075     int remaining_glyphs = entire_shaper_item.num_glyphs;
1076     int glyph_pos = 0;
1077     // for each item shape using harfbuzz and store the results in our layoutData's glyphs array.
1078     for (int k = 0; k < itemBoundaries.size(); k += 2) { // for the +2, see the comment at the definition of itemBoundaries
1079
1080         HB_ShaperItem shaper_item = entire_shaper_item;
1081
1082         shaper_item.item.pos = itemBoundaries[k];
1083         if (k < itemBoundaries.size() - 3) {
1084             shaper_item.item.length = itemBoundaries[k + 2] - shaper_item.item.pos;
1085             shaper_item.num_glyphs = itemBoundaries[k + 3] - itemBoundaries[k + 1];
1086         } else { // last combo in the list, avoid out of bounds access.
1087             shaper_item.item.length -= shaper_item.item.pos - entire_shaper_item.item.pos;
1088             shaper_item.num_glyphs -= itemBoundaries[k + 1];
1089         }
1090         shaper_item.initialGlyphCount = shaper_item.num_glyphs;
1091         if (shaper_item.num_glyphs < shaper_item.item.length)
1092             shaper_item.num_glyphs = shaper_item.item.length;
1093
1094         QFontEngine *actualFontEngine = font;
1095         uint engineIdx = 0;
1096         if (font->type() == QFontEngine::Multi) {
1097             engineIdx = uint(availableGlyphs(&si).glyphs[glyph_pos] >> 24);
1098
1099             actualFontEngine = static_cast<QFontEngineMulti *>(font)->engine(engineIdx);
1100         }
1101
1102         si.ascent = qMax(actualFontEngine->ascent(), si.ascent);
1103         si.descent = qMax(actualFontEngine->descent(), si.descent);
1104         si.leading = qMax(actualFontEngine->leading(), si.leading);
1105
1106         shaper_item.font = actualFontEngine->harfbuzzFont();
1107         shaper_item.face = actualFontEngine->initializedHarfbuzzFace();
1108
1109         shaper_item.glyphIndicesPresent = true;
1110
1111         remaining_glyphs -= shaper_item.initialGlyphCount;
1112
1113         do {
1114             if (!ensureSpace(glyph_pos + shaper_item.num_glyphs + remaining_glyphs))
1115                 return;
1116
1117             const QGlyphLayout g = availableGlyphs(&si).mid(glyph_pos);
1118             if (shaper_item.num_glyphs > shaper_item.item.length)
1119                 moveGlyphData(g.mid(shaper_item.num_glyphs), g.mid(shaper_item.initialGlyphCount), remaining_glyphs);
1120
1121             shaper_item.glyphs = g.glyphs;
1122             shaper_item.attributes = g.attributes;
1123             shaper_item.advances = reinterpret_cast<HB_Fixed *>(g.advances_x);
1124             shaper_item.offsets = reinterpret_cast<HB_FixedPoint *>(g.offsets);
1125
1126             if (shaper_item.glyphIndicesPresent) {
1127                 for (hb_uint32 i = 0; i < shaper_item.initialGlyphCount; ++i)
1128                     shaper_item.glyphs[i] &= 0x00ffffff;
1129             }
1130
1131             shaper_item.log_clusters = logClusters(&si) + shaper_item.item.pos - entire_shaper_item.item.pos;
1132
1133 //          qDebug("    .. num_glyphs=%d, used=%d, item.num_glyphs=%d", num_glyphs, used, shaper_item.num_glyphs);
1134         } while (!qShapeItem(&shaper_item)); // this does the actual shaping via harfbuzz.
1135
1136         QGlyphLayout g = availableGlyphs(&si).mid(glyph_pos, shaper_item.num_glyphs);
1137         moveGlyphData(g.mid(shaper_item.num_glyphs), g.mid(shaper_item.initialGlyphCount), remaining_glyphs);
1138
1139         for (hb_uint32 i = 0; i < shaper_item.num_glyphs; ++i)
1140             g.glyphs[i] = g.glyphs[i] | (engineIdx << 24);
1141
1142         for (hb_uint32 i = 0; i < shaper_item.item.length; ++i)
1143             shaper_item.log_clusters[i] += glyph_pos;
1144
1145         if (kerningEnabled && !shaper_item.kerning_applied)
1146             font->doKerning(&g, option.useDesignMetrics() ? QFlag(QTextEngine::DesignMetrics) : QFlag(0));
1147
1148         glyph_pos += shaper_item.num_glyphs;
1149     }
1150
1151 //     qDebug("    -> item: script=%d num_glyphs=%d", shaper_item.script, shaper_item.num_glyphs);
1152     si.num_glyphs = glyph_pos;
1153
1154     layoutData->used += si.num_glyphs;
1155 }
1156
1157 static void init(QTextEngine *e)
1158 {
1159     e->ignoreBidi = false;
1160     e->cacheGlyphs = false;
1161     e->forceJustification = false;
1162     e->visualMovement = false;
1163     e->delayDecorations = false;
1164
1165     e->layoutData = 0;
1166
1167     e->minWidth = 0;
1168     e->maxWidth = 0;
1169
1170     e->underlinePositions = 0;
1171     e->specialData = 0;
1172     e->stackEngine = false;
1173 #ifndef QT_NO_RAWFONT
1174     e->useRawFont = false;
1175 #endif
1176 }
1177
1178 QTextEngine::QTextEngine()
1179 {
1180     init(this);
1181 }
1182
1183 QTextEngine::QTextEngine(const QString &str, const QFont &f)
1184     : text(str),
1185       fnt(f)
1186 {
1187     init(this);
1188 }
1189
1190 QTextEngine::~QTextEngine()
1191 {
1192     if (!stackEngine)
1193         delete layoutData;
1194     delete specialData;
1195     resetFontEngineCache();
1196 }
1197
1198 const HB_CharAttributes *QTextEngine::attributes() const
1199 {
1200     if (layoutData && layoutData->haveCharAttributes)
1201         return (HB_CharAttributes *) layoutData->memory;
1202
1203     itemize();
1204     if (! ensureSpace(layoutData->string.length()))
1205         return NULL;
1206
1207     QVarLengthArray<HB_ScriptItem> hbScriptItems(layoutData->items.size());
1208
1209     for (int i = 0; i < layoutData->items.size(); ++i) {
1210         const QScriptItem &si = layoutData->items[i];
1211         hbScriptItems[i].pos = si.position;
1212         hbScriptItems[i].length = length(i);
1213         hbScriptItems[i].bidiLevel = si.analysis.bidiLevel;
1214         hbScriptItems[i].script = (HB_Script)si.analysis.script;
1215     }
1216
1217     QUnicodeTools::initCharAttributes(reinterpret_cast<const HB_UChar16 *>(layoutData->string.constData()),
1218                                       layoutData->string.length(),
1219                                       hbScriptItems.data(), hbScriptItems.size(),
1220                                       (HB_CharAttributes *)layoutData->memory);
1221
1222
1223     layoutData->haveCharAttributes = true;
1224     return (HB_CharAttributes *) layoutData->memory;
1225 }
1226
1227 void QTextEngine::shape(int item) const
1228 {
1229     if (layoutData->items[item].analysis.flags == QScriptAnalysis::Object) {
1230         ensureSpace(1);
1231         if (block.docHandle()) {
1232             QTextFormat format = formats()->format(formatIndex(&layoutData->items[item]));
1233             docLayout()->resizeInlineObject(QTextInlineObject(item, const_cast<QTextEngine *>(this)),
1234                                             layoutData->items[item].position + block.position(), format);
1235         }
1236     } else if (layoutData->items[item].analysis.flags == QScriptAnalysis::Tab) {
1237         // set up at least the ascent/descent/leading of the script item for the tab
1238         fontEngine(layoutData->items[item],
1239                    &layoutData->items[item].ascent,
1240                    &layoutData->items[item].descent,
1241                    &layoutData->items[item].leading);
1242     } else {
1243         shapeText(item);
1244     }
1245 }
1246
1247 static inline void releaseCachedFontEngine(QFontEngine *fontEngine)
1248 {
1249     if (fontEngine) {
1250         fontEngine->ref.deref();
1251         if (fontEngine->cache_count == 0 && fontEngine->ref.load() == 0)
1252             delete fontEngine;
1253     }
1254 }
1255
1256 void QTextEngine::resetFontEngineCache()
1257 {
1258     releaseCachedFontEngine(feCache.prevFontEngine);
1259     releaseCachedFontEngine(feCache.prevScaledFontEngine);
1260     feCache.reset();
1261 }
1262
1263 void QTextEngine::invalidate()
1264 {
1265     freeMemory();
1266     minWidth = 0;
1267     maxWidth = 0;
1268     if (specialData)
1269         specialData->resolvedFormatIndices.clear();
1270
1271     resetFontEngineCache();
1272 }
1273
1274 void QTextEngine::clearLineData()
1275 {
1276     lines.clear();
1277 }
1278
1279 void QTextEngine::validate() const
1280 {
1281     if (layoutData)
1282         return;
1283     layoutData = new LayoutData();
1284     if (block.docHandle()) {
1285         layoutData->string = block.text();
1286         if (option.flags() & QTextOption::ShowLineAndParagraphSeparators)
1287             layoutData->string += QLatin1Char(block.next().isValid() ? 0xb6 : 0x20);
1288     } else {
1289         layoutData->string = text;
1290     }
1291     if (specialData && specialData->preeditPosition != -1)
1292         layoutData->string.insert(specialData->preeditPosition, specialData->preeditText);
1293 }
1294
1295 void QTextEngine::itemize() const
1296 {
1297     validate();
1298     if (layoutData->items.size())
1299         return;
1300
1301     int length = layoutData->string.length();
1302     if (!length)
1303         return;
1304
1305     bool ignore = ignoreBidi;
1306
1307     bool rtl = isRightToLeft();
1308
1309     if (!ignore && !rtl) {
1310         ignore = true;
1311         const QChar *start = layoutData->string.unicode();
1312         const QChar * const end = start + length;
1313         while (start < end) {
1314             if (start->unicode() >= 0x590) {
1315                 ignore = false;
1316                 break;
1317             }
1318             ++start;
1319         }
1320     }
1321
1322     QVarLengthArray<QScriptAnalysis, 4096> scriptAnalysis(length);
1323     QScriptAnalysis *analysis = scriptAnalysis.data();
1324
1325     QBidiControl control(rtl);
1326
1327     if (ignore) {
1328         memset(analysis, 0, length*sizeof(QScriptAnalysis));
1329         if (option.textDirection() == Qt::RightToLeft) {
1330             for (int i = 0; i < length; ++i)
1331                 analysis[i].bidiLevel = 1;
1332             layoutData->hasBidi = true;
1333         }
1334     } else {
1335         layoutData->hasBidi = bidiItemize(const_cast<QTextEngine *>(this), analysis, control);
1336     }
1337
1338     const ushort *uc = reinterpret_cast<const ushort *>(layoutData->string.unicode());
1339     const ushort *e = uc + length;
1340     int lastScript = QUnicodeTables::Common;
1341     while (uc < e) {
1342         switch (*uc) {
1343         case QChar::ObjectReplacementCharacter:
1344             analysis->script = QUnicodeTables::Common;
1345             analysis->flags = QScriptAnalysis::Object;
1346             break;
1347         case QChar::LineSeparator:
1348             if (analysis->bidiLevel % 2)
1349                 --analysis->bidiLevel;
1350             analysis->script = QUnicodeTables::Common;
1351             analysis->flags = QScriptAnalysis::LineOrParagraphSeparator;
1352             if (option.flags() & QTextOption::ShowLineAndParagraphSeparators)
1353                 *const_cast<ushort*>(uc) = 0x21B5; // visual line separator
1354             break;
1355         case QChar::Tabulation:
1356             analysis->script = QUnicodeTables::Common;
1357             analysis->flags = QScriptAnalysis::Tab;
1358             analysis->bidiLevel = control.baseLevel();
1359             break;
1360         case QChar::Space:
1361         case QChar::Nbsp:
1362             if (option.flags() & QTextOption::ShowTabsAndSpaces) {
1363                 analysis->script = QUnicodeTables::Common;
1364                 analysis->flags = QScriptAnalysis::Space;
1365                 analysis->bidiLevel = control.baseLevel();
1366                 break;
1367             }
1368         // fall through
1369         default:
1370             int script = QUnicodeTables::script(*uc);
1371             analysis->script = script == QUnicodeTables::Inherited ? lastScript : script;
1372             analysis->flags = QScriptAnalysis::None;
1373             break;
1374         }
1375         lastScript = analysis->script;
1376         ++uc;
1377         ++analysis;
1378     }
1379     if (option.flags() & QTextOption::ShowLineAndParagraphSeparators) {
1380         (analysis-1)->flags = QScriptAnalysis::LineOrParagraphSeparator; // to exclude it from width
1381     }
1382
1383     Itemizer itemizer(layoutData->string, scriptAnalysis.data(), layoutData->items);
1384
1385     const QTextDocumentPrivate *p = block.docHandle();
1386     if (p) {
1387         SpecialData *s = specialData;
1388
1389         QTextDocumentPrivate::FragmentIterator it = p->find(block.position());
1390         QTextDocumentPrivate::FragmentIterator end = p->find(block.position() + block.length() - 1); // -1 to omit the block separator char
1391         int format = it.value()->format;
1392
1393         int prevPosition = 0;
1394         int position = prevPosition;
1395         while (1) {
1396             const QTextFragmentData * const frag = it.value();
1397             if (it == end || format != frag->format) {
1398                 if (s && position >= s->preeditPosition) {
1399                     position += s->preeditText.length();
1400                     s = 0;
1401                 }
1402                 Q_ASSERT(position <= length);
1403                 QFont::Capitalization capitalization =
1404                         formats()->charFormat(format).hasProperty(QTextFormat::FontCapitalization)
1405                         ? formats()->charFormat(format).fontCapitalization()
1406                         : formats()->defaultFont().capitalization();
1407                 itemizer.generate(prevPosition, position - prevPosition, capitalization);
1408                 if (it == end) {
1409                     if (position < length)
1410                         itemizer.generate(position, length - position, capitalization);
1411                     break;
1412                 }
1413                 format = frag->format;
1414                 prevPosition = position;
1415             }
1416             position += frag->size_array[0];
1417             ++it;
1418         }
1419     } else {
1420 #ifndef QT_NO_RAWFONT
1421         if (useRawFont && specialData) {
1422             int lastIndex = 0;
1423             for (int i = 0; i < specialData->addFormats.size(); ++i) {
1424                 const QTextLayout::FormatRange &range = specialData->addFormats.at(i);
1425                 if (range.format.fontCapitalization()) {
1426                     itemizer.generate(lastIndex, range.start - lastIndex, QFont::MixedCase);
1427                     itemizer.generate(range.start, range.length, range.format.fontCapitalization());
1428                     lastIndex = range.start + range.length;
1429                 }
1430             }
1431             itemizer.generate(lastIndex, length - lastIndex, QFont::MixedCase);
1432         } else
1433 #endif
1434             itemizer.generate(0, length, static_cast<QFont::Capitalization> (fnt.d->capital));
1435     }
1436
1437     addRequiredBoundaries();
1438     resolveAdditionalFormats();
1439 }
1440
1441 bool QTextEngine::isRightToLeft() const
1442 {
1443     switch (option.textDirection()) {
1444     case Qt::LeftToRight:
1445         return false;
1446     case Qt::RightToLeft:
1447         return true;
1448     default:
1449         break;
1450     }
1451     if (!layoutData)
1452         itemize();
1453     // this places the cursor in the right position depending on the keyboard layout
1454     if (layoutData->string.isEmpty())
1455         return qApp ? qApp->inputMethod()->inputDirection() == Qt::RightToLeft : false;
1456     return layoutData->string.isRightToLeft();
1457 }
1458
1459
1460 int QTextEngine::findItem(int strPos) const
1461 {
1462     itemize();
1463     int left = 1;
1464     int right = layoutData->items.size()-1;
1465     while(left <= right) {
1466         int middle = ((right-left)/2)+left;
1467         if (strPos > layoutData->items[middle].position)
1468             left = middle+1;
1469         else if(strPos < layoutData->items[middle].position)
1470             right = middle-1;
1471         else {
1472             return middle;
1473         }
1474     }
1475     return right;
1476 }
1477
1478 QFixed QTextEngine::width(int from, int len) const
1479 {
1480     itemize();
1481
1482     QFixed w = 0;
1483
1484 //     qDebug("QTextEngine::width(from = %d, len = %d), numItems=%d, strleng=%d", from,  len, items.size(), string.length());
1485     for (int i = 0; i < layoutData->items.size(); i++) {
1486         const QScriptItem *si = layoutData->items.constData() + i;
1487         int pos = si->position;
1488         int ilen = length(i);
1489 //          qDebug("item %d: from %d len %d", i, pos, ilen);
1490         if (pos >= from + len)
1491             break;
1492         if (pos + ilen > from) {
1493             if (!si->num_glyphs)
1494                 shape(i);
1495
1496             if (si->analysis.flags == QScriptAnalysis::Object) {
1497                 w += si->width;
1498                 continue;
1499             } else if (si->analysis.flags == QScriptAnalysis::Tab) {
1500                 w += calculateTabWidth(i, w);
1501                 continue;
1502             }
1503
1504
1505             QGlyphLayout glyphs = shapedGlyphs(si);
1506             unsigned short *logClusters = this->logClusters(si);
1507
1508 //             fprintf(stderr, "  logclusters:");
1509 //             for (int k = 0; k < ilen; k++)
1510 //                 fprintf(stderr, " %d", logClusters[k]);
1511 //             fprintf(stderr, "\n");
1512             // do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
1513             int charFrom = from - pos;
1514             if (charFrom < 0)
1515                 charFrom = 0;
1516             int glyphStart = logClusters[charFrom];
1517             if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
1518                 while (charFrom < ilen && logClusters[charFrom] == glyphStart)
1519                     charFrom++;
1520             if (charFrom < ilen) {
1521                 glyphStart = logClusters[charFrom];
1522                 int charEnd = from + len - 1 - pos;
1523                 if (charEnd >= ilen)
1524                     charEnd = ilen-1;
1525                 int glyphEnd = logClusters[charEnd];
1526                 while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
1527                     charEnd++;
1528                 glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
1529
1530 //                 qDebug("char: start=%d end=%d / glyph: start = %d, end = %d", charFrom, charEnd, glyphStart, glyphEnd);
1531                 for (int i = glyphStart; i < glyphEnd; i++)
1532                     w += glyphs.advances_x[i] * !glyphs.attributes[i].dontPrint;
1533             }
1534         }
1535     }
1536 //     qDebug("   --> w= %d ", w);
1537     return w;
1538 }
1539
1540 glyph_metrics_t QTextEngine::boundingBox(int from,  int len) const
1541 {
1542     itemize();
1543
1544     glyph_metrics_t gm;
1545
1546     for (int i = 0; i < layoutData->items.size(); i++) {
1547         const QScriptItem *si = layoutData->items.constData() + i;
1548
1549         int pos = si->position;
1550         int ilen = length(i);
1551         if (pos > from + len)
1552             break;
1553         if (pos + ilen > from) {
1554             if (!si->num_glyphs)
1555                 shape(i);
1556
1557             if (si->analysis.flags == QScriptAnalysis::Object) {
1558                 gm.width += si->width;
1559                 continue;
1560             } else if (si->analysis.flags == QScriptAnalysis::Tab) {
1561                 gm.width += calculateTabWidth(i, gm.width);
1562                 continue;
1563             }
1564
1565             unsigned short *logClusters = this->logClusters(si);
1566             QGlyphLayout glyphs = shapedGlyphs(si);
1567
1568             // do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
1569             int charFrom = from - pos;
1570             if (charFrom < 0)
1571                 charFrom = 0;
1572             int glyphStart = logClusters[charFrom];
1573             if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
1574                 while (charFrom < ilen && logClusters[charFrom] == glyphStart)
1575                     charFrom++;
1576             if (charFrom < ilen) {
1577                 QFontEngine *fe = fontEngine(*si);
1578                 glyphStart = logClusters[charFrom];
1579                 int charEnd = from + len - 1 - pos;
1580                 if (charEnd >= ilen)
1581                     charEnd = ilen-1;
1582                 int glyphEnd = logClusters[charEnd];
1583                 while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
1584                     charEnd++;
1585                 glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
1586                 if (glyphStart <= glyphEnd ) {
1587                     glyph_metrics_t m = fe->boundingBox(glyphs.mid(glyphStart, glyphEnd - glyphStart));
1588                     gm.x = qMin(gm.x, m.x + gm.xoff);
1589                     gm.y = qMin(gm.y, m.y + gm.yoff);
1590                     gm.width = qMax(gm.width, m.width+gm.xoff);
1591                     gm.height = qMax(gm.height, m.height+gm.yoff);
1592                     gm.xoff += m.xoff;
1593                     gm.yoff += m.yoff;
1594                 }
1595             }
1596         }
1597     }
1598     return gm;
1599 }
1600
1601 glyph_metrics_t QTextEngine::tightBoundingBox(int from,  int len) const
1602 {
1603     itemize();
1604
1605     glyph_metrics_t gm;
1606
1607     for (int i = 0; i < layoutData->items.size(); i++) {
1608         const QScriptItem *si = layoutData->items.constData() + i;
1609         int pos = si->position;
1610         int ilen = length(i);
1611         if (pos > from + len)
1612             break;
1613         if (pos + len > from) {
1614             if (!si->num_glyphs)
1615                 shape(i);
1616             unsigned short *logClusters = this->logClusters(si);
1617             QGlyphLayout glyphs = shapedGlyphs(si);
1618
1619             // do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
1620             int charFrom = from - pos;
1621             if (charFrom < 0)
1622                 charFrom = 0;
1623             int glyphStart = logClusters[charFrom];
1624             if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
1625                 while (charFrom < ilen && logClusters[charFrom] == glyphStart)
1626                     charFrom++;
1627             if (charFrom < ilen) {
1628                 glyphStart = logClusters[charFrom];
1629                 int charEnd = from + len - 1 - pos;
1630                 if (charEnd >= ilen)
1631                     charEnd = ilen-1;
1632                 int glyphEnd = logClusters[charEnd];
1633                 while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
1634                     charEnd++;
1635                 glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
1636                 if (glyphStart <= glyphEnd ) {
1637                     QFontEngine *fe = fontEngine(*si);
1638                     glyph_metrics_t m = fe->tightBoundingBox(glyphs.mid(glyphStart, glyphEnd - glyphStart));
1639                     gm.x = qMin(gm.x, m.x + gm.xoff);
1640                     gm.y = qMin(gm.y, m.y + gm.yoff);
1641                     gm.width = qMax(gm.width, m.width+gm.xoff);
1642                     gm.height = qMax(gm.height, m.height+gm.yoff);
1643                     gm.xoff += m.xoff;
1644                     gm.yoff += m.yoff;
1645                 }
1646             }
1647         }
1648     }
1649     return gm;
1650 }
1651
1652 QFont QTextEngine::font(const QScriptItem &si) const
1653 {
1654     QFont font = fnt;
1655     if (hasFormats()) {
1656         QTextCharFormat f = format(&si);
1657         font = f.font();
1658
1659         if (block.docHandle() && block.docHandle()->layout()) {
1660             // Make sure we get the right dpi on printers
1661             QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
1662             if (pdev)
1663                 font = QFont(font, pdev);
1664         } else {
1665             font = font.resolve(fnt);
1666         }
1667         QTextCharFormat::VerticalAlignment valign = f.verticalAlignment();
1668         if (valign == QTextCharFormat::AlignSuperScript || valign == QTextCharFormat::AlignSubScript) {
1669             if (font.pointSize() != -1)
1670                 font.setPointSize((font.pointSize() * 2) / 3);
1671             else
1672                 font.setPixelSize((font.pixelSize() * 2) / 3);
1673         }
1674     }
1675
1676     if (si.analysis.flags == QScriptAnalysis::SmallCaps)
1677         font = font.d->smallCapsFont();
1678
1679     return font;
1680 }
1681
1682 QTextEngine::FontEngineCache::FontEngineCache()
1683 {
1684     reset();
1685 }
1686
1687 //we cache the previous results of this function, as calling it numerous times with the same effective
1688 //input is common (and hard to cache at a higher level)
1689 QFontEngine *QTextEngine::fontEngine(const QScriptItem &si, QFixed *ascent, QFixed *descent, QFixed *leading) const
1690 {
1691     QFontEngine *engine = 0;
1692     QFontEngine *scaledEngine = 0;
1693     int script = si.analysis.script;
1694
1695     QFont font = fnt;
1696 #ifndef QT_NO_RAWFONT
1697     if (useRawFont && rawFont.isValid()) {
1698         if (feCache.prevFontEngine && feCache.prevFontEngine->type() == QFontEngine::Multi && feCache.prevScript == script) {
1699             engine = feCache.prevFontEngine;
1700         } else {
1701             engine = QFontEngineMultiQPA::createMultiFontEngine(rawFont.d->fontEngine, script);
1702             feCache.prevFontEngine = engine;
1703             feCache.prevScript = script;
1704             engine->ref.ref();
1705             if (feCache.prevScaledFontEngine)
1706                 releaseCachedFontEngine(feCache.prevScaledFontEngine);
1707         }
1708         if (si.analysis.flags & QFont::SmallCaps) {
1709             if (feCache.prevScaledFontEngine) {
1710                 scaledEngine = feCache.prevScaledFontEngine;
1711             } else {
1712                 QFontEngine *scEngine = rawFont.d->fontEngine->cloneWithSize(smallCapsFraction * rawFont.pixelSize());
1713                 scaledEngine = QFontEngineMultiQPA::createMultiFontEngine(scEngine, script);
1714                 scaledEngine->ref.ref();
1715                 feCache.prevScaledFontEngine = scaledEngine;
1716             }
1717         }
1718     } else
1719 #endif
1720     {
1721         if (hasFormats()) {
1722             if (feCache.prevFontEngine && feCache.prevPosition == si.position && feCache.prevLength == length(&si) && feCache.prevScript == script) {
1723                 engine = feCache.prevFontEngine;
1724                 scaledEngine = feCache.prevScaledFontEngine;
1725             } else {
1726                 QTextCharFormat f = format(&si);
1727                 font = f.font();
1728
1729                 if (block.docHandle() && block.docHandle()->layout()) {
1730                     // Make sure we get the right dpi on printers
1731                     QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
1732                     if (pdev)
1733                         font = QFont(font, pdev);
1734                 } else {
1735                     font = font.resolve(fnt);
1736                 }
1737                 engine = font.d->engineForScript(script);
1738                 QTextCharFormat::VerticalAlignment valign = f.verticalAlignment();
1739                 if (valign == QTextCharFormat::AlignSuperScript || valign == QTextCharFormat::AlignSubScript) {
1740                     if (font.pointSize() != -1)
1741                         font.setPointSize((font.pointSize() * 2) / 3);
1742                     else
1743                         font.setPixelSize((font.pixelSize() * 2) / 3);
1744                     scaledEngine = font.d->engineForScript(script);
1745                 }
1746
1747                 if (engine)
1748                     engine->ref.ref();
1749                 if (feCache.prevFontEngine)
1750                     releaseCachedFontEngine(feCache.prevFontEngine);
1751                 feCache.prevFontEngine = engine;
1752
1753                 if (scaledEngine)
1754                     scaledEngine->ref.ref();
1755                 if (feCache.prevScaledFontEngine)
1756                     releaseCachedFontEngine(feCache.prevScaledFontEngine);
1757                 feCache.prevScaledFontEngine = scaledEngine;
1758
1759                 feCache.prevScript = script;
1760                 feCache.prevPosition = si.position;
1761                 feCache.prevLength = length(&si);
1762             }
1763         } else {
1764             if (feCache.prevFontEngine && feCache.prevScript == script && feCache.prevPosition == -1)
1765                 engine = feCache.prevFontEngine;
1766             else {
1767                 engine = font.d->engineForScript(script);
1768
1769                 if (engine)
1770                     engine->ref.ref();
1771                 if (feCache.prevFontEngine)
1772                     releaseCachedFontEngine(feCache.prevFontEngine);
1773                 feCache.prevFontEngine = engine;
1774
1775                 feCache.prevScript = script;
1776                 feCache.prevPosition = -1;
1777                 feCache.prevLength = -1;
1778                 feCache.prevScaledFontEngine = 0;
1779             }
1780         }
1781
1782         if (si.analysis.flags == QScriptAnalysis::SmallCaps) {
1783             QFontPrivate *p = font.d->smallCapsFontPrivate();
1784             scaledEngine = p->engineForScript(script);
1785         }
1786     }
1787
1788     if (ascent) {
1789         *ascent = engine->ascent();
1790         *descent = engine->descent();
1791         *leading = engine->leading();
1792     }
1793
1794     if (scaledEngine)
1795         return scaledEngine;
1796     return engine;
1797 }
1798
1799 struct QJustificationPoint {
1800     int type;
1801     QFixed kashidaWidth;
1802     QGlyphLayout glyph;
1803     QFontEngine *fontEngine;
1804 };
1805
1806 Q_DECLARE_TYPEINFO(QJustificationPoint, Q_PRIMITIVE_TYPE);
1807
1808 static void set(QJustificationPoint *point, int type, const QGlyphLayout &glyph, QFontEngine *fe)
1809 {
1810     point->type = type;
1811     point->glyph = glyph;
1812     point->fontEngine = fe;
1813
1814     if (type >= HB_Arabic_Normal) {
1815         QChar ch(0x640); // Kashida character
1816         QGlyphLayoutArray<8> glyphs;
1817         int nglyphs = 7;
1818         fe->stringToCMap(&ch, 1, &glyphs, &nglyphs, 0);
1819         if (glyphs.glyphs[0] && glyphs.advances_x[0] != 0) {
1820             point->kashidaWidth = glyphs.advances_x[0];
1821         } else {
1822             point->type = HB_NoJustification;
1823             point->kashidaWidth = 0;
1824         }
1825     }
1826 }
1827
1828
1829 void QTextEngine::justify(const QScriptLine &line)
1830 {
1831 //     qDebug("justify: line.gridfitted = %d, line.justified=%d", line.gridfitted, line.justified);
1832     if (line.gridfitted && line.justified)
1833         return;
1834
1835     if (!line.gridfitted) {
1836         // redo layout in device metrics, then adjust
1837         const_cast<QScriptLine &>(line).gridfitted = true;
1838     }
1839
1840     if ((option.alignment() & Qt::AlignHorizontal_Mask) != Qt::AlignJustify)
1841         return;
1842
1843     itemize();
1844
1845     if (!forceJustification) {
1846         int end = line.from + (int)line.length;
1847         if (end == layoutData->string.length())
1848             return; // no justification at end of paragraph
1849         if (end && layoutData->items[findItem(end-1)].analysis.flags == QScriptAnalysis::LineOrParagraphSeparator)
1850             return; // no justification at the end of an explicitly separated line
1851     }
1852
1853     // justify line
1854     int maxJustify = 0;
1855
1856     // don't include trailing white spaces when doing justification
1857     int line_length = line.length;
1858     const HB_CharAttributes *a = attributes();
1859     if (! a)
1860         return;
1861     a += line.from;
1862     while (line_length && a[line_length-1].whiteSpace)
1863         --line_length;
1864     // subtract one char more, as we can't justfy after the last character
1865     --line_length;
1866
1867     if (!line_length)
1868         return;
1869
1870     int firstItem = findItem(line.from);
1871     int nItems = findItem(line.from + line_length - 1) - firstItem + 1;
1872
1873     QVarLengthArray<QJustificationPoint> justificationPoints;
1874     int nPoints = 0;
1875 //     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());
1876     QFixed minKashida = 0x100000;
1877
1878     // we need to do all shaping before we go into the next loop, as we there
1879     // store pointers to the glyph data that could get reallocated by the shaping
1880     // process.
1881     for (int i = 0; i < nItems; ++i) {
1882         QScriptItem &si = layoutData->items[firstItem + i];
1883         if (!si.num_glyphs)
1884             shape(firstItem + i);
1885     }
1886
1887     for (int i = 0; i < nItems; ++i) {
1888         QScriptItem &si = layoutData->items[firstItem + i];
1889
1890         int kashida_type = HB_Arabic_Normal;
1891         int kashida_pos = -1;
1892
1893         int start = qMax(line.from - si.position, 0);
1894         int end = qMin(line.from + line_length - (int)si.position, length(firstItem+i));
1895
1896         unsigned short *log_clusters = logClusters(&si);
1897
1898         int gs = log_clusters[start];
1899         int ge = (end == length(firstItem+i) ? si.num_glyphs : log_clusters[end]);
1900
1901         const QGlyphLayout g = shapedGlyphs(&si);
1902
1903         for (int i = gs; i < ge; ++i) {
1904             g.justifications[i].type = QGlyphJustification::JustifyNone;
1905             g.justifications[i].nKashidas = 0;
1906             g.justifications[i].space_18d6 = 0;
1907
1908             justificationPoints.resize(nPoints+3);
1909             int justification = g.attributes[i].justification;
1910
1911             switch(justification) {
1912             case HB_NoJustification:
1913                 break;
1914             case HB_Space          :
1915                 // fall through
1916             case HB_Arabic_Space   :
1917                 if (kashida_pos >= 0) {
1918 //                     qDebug("kashida position at %d in word", kashida_pos);
1919                     set(&justificationPoints[nPoints], kashida_type, g.mid(kashida_pos), fontEngine(si));
1920                     if (justificationPoints[nPoints].kashidaWidth > 0) {
1921                         minKashida = qMin(minKashida, justificationPoints[nPoints].kashidaWidth);
1922                         maxJustify = qMax(maxJustify, justificationPoints[nPoints].type);
1923                         ++nPoints;
1924                     }
1925                 }
1926                 kashida_pos = -1;
1927                 kashida_type = HB_Arabic_Normal;
1928                 // fall through
1929             case HB_Character      :
1930                 set(&justificationPoints[nPoints++], justification, g.mid(i), fontEngine(si));
1931                 maxJustify = qMax(maxJustify, justification);
1932                 break;
1933             case HB_Arabic_Normal  :
1934             case HB_Arabic_Waw     :
1935             case HB_Arabic_BaRa    :
1936             case HB_Arabic_Alef    :
1937             case HB_Arabic_HaaDal  :
1938             case HB_Arabic_Seen    :
1939             case HB_Arabic_Kashida :
1940                 if (justification >= kashida_type) {
1941                     kashida_pos = i;
1942                     kashida_type = justification;
1943                 }
1944             }
1945         }
1946         if (kashida_pos >= 0) {
1947             set(&justificationPoints[nPoints], kashida_type, g.mid(kashida_pos), fontEngine(si));
1948             if (justificationPoints[nPoints].kashidaWidth > 0) {
1949                 minKashida = qMin(minKashida, justificationPoints[nPoints].kashidaWidth);
1950                 maxJustify = qMax(maxJustify, justificationPoints[nPoints].type);
1951                 ++nPoints;
1952             }
1953         }
1954     }
1955
1956     QFixed leading = leadingSpaceWidth(line);
1957     QFixed need = line.width - line.textWidth - leading;
1958     if (need < 0) {
1959         // line overflows already!
1960         const_cast<QScriptLine &>(line).justified = true;
1961         return;
1962     }
1963
1964 //     qDebug("doing justification: textWidth=%x, requested=%x, maxJustify=%d", line.textWidth.value(), line.width.value(), maxJustify);
1965 //     qDebug("     minKashida=%f, need=%f", minKashida.toReal(), need.toReal());
1966
1967     // distribute in priority order
1968     if (maxJustify >= HB_Arabic_Normal) {
1969         while (need >= minKashida) {
1970             for (int type = maxJustify; need >= minKashida && type >= HB_Arabic_Normal; --type) {
1971                 for (int i = 0; need >= minKashida && i < nPoints; ++i) {
1972                     if (justificationPoints[i].type == type && justificationPoints[i].kashidaWidth <= need) {
1973                         justificationPoints[i].glyph.justifications->nKashidas++;
1974                         // ############
1975                         justificationPoints[i].glyph.justifications->space_18d6 += justificationPoints[i].kashidaWidth.value();
1976                         need -= justificationPoints[i].kashidaWidth;
1977 //                         qDebug("adding kashida type %d with width %x, neednow %x", type, justificationPoints[i].kashidaWidth, need.value());
1978                     }
1979                 }
1980             }
1981         }
1982     }
1983     Q_ASSERT(need >= 0);
1984     if (!need)
1985         goto end;
1986
1987     maxJustify = qMin(maxJustify, (int)HB_Space);
1988     for (int type = maxJustify; need != 0 && type > 0; --type) {
1989         int n = 0;
1990         for (int i = 0; i < nPoints; ++i) {
1991             if (justificationPoints[i].type == type)
1992                 ++n;
1993         }
1994 //          qDebug("number of points for justification type %d: %d", type, n);
1995
1996
1997         if (!n)
1998             continue;
1999
2000         for (int i = 0; i < nPoints; ++i) {
2001             if (justificationPoints[i].type == type) {
2002                 QFixed add = need/n;
2003 //                  qDebug("adding %x to glyph %x", add.value(), justificationPoints[i].glyph->glyph);
2004                 justificationPoints[i].glyph.justifications[0].space_18d6 = add.value();
2005                 need -= add;
2006                 --n;
2007             }
2008         }
2009
2010         Q_ASSERT(!need);
2011     }
2012  end:
2013     const_cast<QScriptLine &>(line).justified = true;
2014 }
2015
2016 void QScriptLine::setDefaultHeight(QTextEngine *eng)
2017 {
2018     QFont f;
2019     QFontEngine *e;
2020
2021     if (eng->block.docHandle() && eng->block.docHandle()->layout()) {
2022         f = eng->block.charFormat().font();
2023         // Make sure we get the right dpi on printers
2024         QPaintDevice *pdev = eng->block.docHandle()->layout()->paintDevice();
2025         if (pdev)
2026             f = QFont(f, pdev);
2027         e = f.d->engineForScript(QUnicodeTables::Common);
2028     } else {
2029         e = eng->fnt.d->engineForScript(QUnicodeTables::Common);
2030     }
2031
2032     QFixed other_ascent = e->ascent();
2033     QFixed other_descent = e->descent();
2034     QFixed other_leading = e->leading();
2035     leading = qMax(leading + ascent, other_leading + other_ascent) - qMax(ascent, other_ascent);
2036     ascent = qMax(ascent, other_ascent);
2037     descent = qMax(descent, other_descent);
2038 }
2039
2040 QTextEngine::LayoutData::LayoutData()
2041 {
2042     memory = 0;
2043     allocated = 0;
2044     memory_on_stack = false;
2045     used = 0;
2046     hasBidi = false;
2047     layoutState = LayoutEmpty;
2048     haveCharAttributes = false;
2049     logClustersPtr = 0;
2050     available_glyphs = 0;
2051 }
2052
2053 QTextEngine::LayoutData::LayoutData(const QString &str, void **stack_memory, int _allocated)
2054     : string(str)
2055 {
2056     allocated = _allocated;
2057
2058     int space_charAttributes = sizeof(HB_CharAttributes)*string.length()/sizeof(void*) + 1;
2059     int space_logClusters = sizeof(unsigned short)*string.length()/sizeof(void*) + 1;
2060     available_glyphs = ((int)allocated - space_charAttributes - space_logClusters)*(int)sizeof(void*)/(int)QGlyphLayout::spaceNeededForGlyphLayout(1);
2061
2062     if (available_glyphs < str.length()) {
2063         // need to allocate on the heap
2064         allocated = 0;
2065
2066         memory_on_stack = false;
2067         memory = 0;
2068         logClustersPtr = 0;
2069     } else {
2070         memory_on_stack = true;
2071         memory = stack_memory;
2072         logClustersPtr = (unsigned short *)(memory + space_charAttributes);
2073
2074         void *m = memory + space_charAttributes + space_logClusters;
2075         glyphLayout = QGlyphLayout(reinterpret_cast<char *>(m), str.length());
2076         glyphLayout.clear();
2077         memset(memory, 0, space_charAttributes*sizeof(void *));
2078     }
2079     used = 0;
2080     hasBidi = false;
2081     layoutState = LayoutEmpty;
2082     haveCharAttributes = false;
2083 }
2084
2085 QTextEngine::LayoutData::~LayoutData()
2086 {
2087     if (!memory_on_stack)
2088         free(memory);
2089     memory = 0;
2090 }
2091
2092 bool QTextEngine::LayoutData::reallocate(int totalGlyphs)
2093 {
2094     Q_ASSERT(totalGlyphs >= glyphLayout.numGlyphs);
2095     if (memory_on_stack && available_glyphs >= totalGlyphs) {
2096         glyphLayout.grow(glyphLayout.data(), totalGlyphs);
2097         return true;
2098     }
2099
2100     int space_charAttributes = sizeof(HB_CharAttributes)*string.length()/sizeof(void*) + 1;
2101     int space_logClusters = sizeof(unsigned short)*string.length()/sizeof(void*) + 1;
2102     int space_glyphs = QGlyphLayout::spaceNeededForGlyphLayout(totalGlyphs)/sizeof(void*) + 2;
2103
2104     int newAllocated = space_charAttributes + space_glyphs + space_logClusters;
2105     // These values can be negative if the length of string/glyphs causes overflow,
2106     // we can't layout such a long string all at once, so return false here to
2107     // indicate there is a failure
2108     if (space_charAttributes < 0 || space_logClusters < 0 || space_glyphs < 0 || newAllocated < allocated) {
2109         layoutState = LayoutFailed;
2110         return false;
2111     }
2112
2113     void **newMem = memory;
2114     newMem = (void **)::realloc(memory_on_stack ? 0 : memory, newAllocated*sizeof(void *));
2115     if (!newMem) {
2116         layoutState = LayoutFailed;
2117         return false;
2118     }
2119     if (memory_on_stack)
2120         memcpy(newMem, memory, allocated*sizeof(void *));
2121     memory = newMem;
2122     memory_on_stack = false;
2123
2124     void **m = memory;
2125     m += space_charAttributes;
2126     logClustersPtr = (unsigned short *) m;
2127     m += space_logClusters;
2128
2129     const int space_preGlyphLayout = space_charAttributes + space_logClusters;
2130     if (allocated < space_preGlyphLayout)
2131         memset(memory + allocated, 0, (space_preGlyphLayout - allocated)*sizeof(void *));
2132
2133     glyphLayout.grow(reinterpret_cast<char *>(m), totalGlyphs);
2134
2135     allocated = newAllocated;
2136     return true;
2137 }
2138
2139 // grow to the new size, copying the existing data to the new layout
2140 void QGlyphLayout::grow(char *address, int totalGlyphs)
2141 {
2142     QGlyphLayout oldLayout(address, numGlyphs);
2143     QGlyphLayout newLayout(address, totalGlyphs);
2144
2145     if (numGlyphs) {
2146         // move the existing data
2147         memmove(newLayout.attributes, oldLayout.attributes, numGlyphs * sizeof(HB_GlyphAttributes));
2148         memmove(newLayout.justifications, oldLayout.justifications, numGlyphs * sizeof(QGlyphJustification));
2149         memmove(newLayout.advances_y, oldLayout.advances_y, numGlyphs * sizeof(QFixed));
2150         memmove(newLayout.advances_x, oldLayout.advances_x, numGlyphs * sizeof(QFixed));
2151         memmove(newLayout.glyphs, oldLayout.glyphs, numGlyphs * sizeof(HB_Glyph));
2152     }
2153
2154     // clear the new data
2155     newLayout.clear(numGlyphs);
2156
2157     *this = newLayout;
2158 }
2159
2160 void QTextEngine::freeMemory()
2161 {
2162     if (!stackEngine) {
2163         delete layoutData;
2164         layoutData = 0;
2165     } else {
2166         layoutData->used = 0;
2167         layoutData->hasBidi = false;
2168         layoutData->layoutState = LayoutEmpty;
2169         layoutData->haveCharAttributes = false;
2170     }
2171     for (int i = 0; i < lines.size(); ++i) {
2172         lines[i].justified = 0;
2173         lines[i].gridfitted = 0;
2174     }
2175 }
2176
2177 int QTextEngine::formatIndex(const QScriptItem *si) const
2178 {
2179     if (specialData && !specialData->resolvedFormatIndices.isEmpty())
2180         return specialData->resolvedFormatIndices.at(si - &layoutData->items[0]);
2181     QTextDocumentPrivate *p = block.docHandle();
2182     if (!p)
2183         return -1;
2184     int pos = si->position;
2185     if (specialData && si->position >= specialData->preeditPosition) {
2186         if (si->position < specialData->preeditPosition + specialData->preeditText.length())
2187             pos = qMax(qMin(block.length(), specialData->preeditPosition) - 1, 0);
2188         else
2189             pos -= specialData->preeditText.length();
2190     }
2191     QTextDocumentPrivate::FragmentIterator it = p->find(block.position() + pos);
2192     return it.value()->format;
2193 }
2194
2195
2196 QTextCharFormat QTextEngine::format(const QScriptItem *si) const
2197 {
2198     QTextCharFormat format;
2199     const QTextFormatCollection *formats = 0;
2200     if (block.docHandle()) {
2201         formats = this->formats();
2202         format = formats->charFormat(formatIndex(si));
2203     }
2204     if (specialData && specialData->resolvedFormatIndices.isEmpty()) {
2205         int end = si->position + length(si);
2206         for (int i = 0; i < specialData->addFormats.size(); ++i) {
2207             const QTextLayout::FormatRange &r = specialData->addFormats.at(i);
2208             if (r.start <= si->position && r.start + r.length >= end) {
2209                 if (!specialData->addFormatIndices.isEmpty())
2210                     format.merge(formats->format(specialData->addFormatIndices.at(i)));
2211                 else
2212                     format.merge(r.format);
2213             }
2214         }
2215     }
2216     return format;
2217 }
2218
2219 void QTextEngine::addRequiredBoundaries() const
2220 {
2221     if (specialData) {
2222         for (int i = 0; i < specialData->addFormats.size(); ++i) {
2223             const QTextLayout::FormatRange &r = specialData->addFormats.at(i);
2224             setBoundary(r.start);
2225             setBoundary(r.start + r.length);
2226             //qDebug("adding boundaries %d %d", r.start, r.start+r.length);
2227         }
2228     }
2229 }
2230
2231 bool QTextEngine::atWordSeparator(int position) const
2232 {
2233     const QChar c = layoutData->string.at(position);
2234     switch (c.unicode()) {
2235     case '.':
2236     case ',':
2237     case '?':
2238     case '!':
2239     case '@':
2240     case '#':
2241     case '$':
2242     case ':':
2243     case ';':
2244     case '-':
2245     case '<':
2246     case '>':
2247     case '[':
2248     case ']':
2249     case '(':
2250     case ')':
2251     case '{':
2252     case '}':
2253     case '=':
2254     case '/':
2255     case '+':
2256     case '%':
2257     case '&':
2258     case '^':
2259     case '*':
2260     case '\'':
2261     case '"':
2262     case '`':
2263     case '~':
2264     case '|':
2265         return true;
2266     default:
2267         break;
2268     }
2269     return false;
2270 }
2271
2272 bool QTextEngine::atSpace(int position) const
2273 {
2274     const QChar c = layoutData->string.at(position);
2275     switch (c.unicode()) {
2276     case QChar::Tabulation:
2277     case QChar::Space:
2278     case QChar::Nbsp:
2279     case QChar::LineSeparator:
2280         return true;
2281     default:
2282         break;
2283     }
2284     return false;
2285 }
2286
2287
2288 void QTextEngine::indexAdditionalFormats()
2289 {
2290     if (!block.docHandle())
2291         return;
2292
2293     specialData->addFormatIndices.resize(specialData->addFormats.count());
2294     QTextFormatCollection * const formats = this->formats();
2295
2296     for (int i = 0; i < specialData->addFormats.count(); ++i) {
2297         specialData->addFormatIndices[i] = formats->indexForFormat(specialData->addFormats.at(i).format);
2298         specialData->addFormats[i].format = QTextCharFormat();
2299     }
2300 }
2301
2302 /* These two helper functions are used to determine whether we need to insert a ZWJ character
2303    between the text that gets truncated and the ellipsis. This is important to get
2304    correctly shaped results for arabic text.
2305 */
2306 static inline bool nextCharJoins(const QString &string, int pos)
2307 {
2308     while (pos < string.length() && string.at(pos).category() == QChar::Mark_NonSpacing)
2309         ++pos;
2310     if (pos == string.length())
2311         return false;
2312     return string.at(pos).joining() != QChar::OtherJoining;
2313 }
2314
2315 static inline bool prevCharJoins(const QString &string, int pos)
2316 {
2317     while (pos > 0 && string.at(pos - 1).category() == QChar::Mark_NonSpacing)
2318         --pos;
2319     if (pos == 0)
2320         return false;
2321     QChar::Joining joining = string.at(pos - 1).joining();
2322     return (joining == QChar::Dual || joining == QChar::Center);
2323 }
2324
2325 static inline bool isRetainableControlCode(QChar c)
2326 {
2327     return (c.unicode() == 0x202a       // LRE
2328             || c.unicode() == 0x202b    // LRE
2329             || c.unicode() == 0x202c    // PDF
2330             || c.unicode() == 0x202d    // LRO
2331             || c.unicode() == 0x202e    // RLO
2332             || c.unicode() == 0x200e    // LRM
2333             || c.unicode() == 0x200f);  // RLM
2334 }
2335
2336 static QString stringMidRetainingBidiCC(const QString &string,
2337                                         const QString &ellidePrefix,
2338                                         const QString &ellideSuffix,
2339                                         int subStringFrom,
2340                                         int subStringTo,
2341                                         int midStart,
2342                                         int midLength)
2343 {
2344     QString prefix;
2345     for (int i=subStringFrom; i<midStart; ++i) {
2346         QChar c = string.at(i);
2347         if (isRetainableControlCode(c))
2348             prefix += c;
2349     }
2350
2351     QString suffix;
2352     for (int i=midStart + midLength; i<subStringTo; ++i) {
2353         QChar c = string.at(i);
2354         if (isRetainableControlCode(c))
2355             suffix += c;
2356     }
2357
2358     return prefix + ellidePrefix + string.mid(midStart, midLength) + ellideSuffix + suffix;
2359 }
2360
2361 QString QTextEngine::elidedText(Qt::TextElideMode mode, const QFixed &width, int flags, int from, int count) const
2362 {
2363 //    qDebug() << "elidedText; available width" << width.toReal() << "text width:" << this->width(0, layoutData->string.length()).toReal();
2364
2365     if (flags & Qt::TextShowMnemonic) {
2366         itemize();
2367         HB_CharAttributes *attributes = const_cast<HB_CharAttributes *>(this->attributes());
2368         if (!attributes)
2369             return QString();
2370         for (int i = 0; i < layoutData->items.size(); ++i) {
2371             QScriptItem &si = layoutData->items[i];
2372             if (!si.num_glyphs)
2373                 shape(i);
2374
2375             unsigned short *logClusters = this->logClusters(&si);
2376             QGlyphLayout glyphs = shapedGlyphs(&si);
2377
2378             const int end = si.position + length(&si);
2379             for (int i = si.position; i < end - 1; ++i) {
2380                 if (layoutData->string.at(i) == QLatin1Char('&')) {
2381                     const int gp = logClusters[i - si.position];
2382                     glyphs.attributes[gp].dontPrint = true;
2383                     attributes[i + 1].charStop = false;
2384                     attributes[i + 1].whiteSpace = false;
2385                     attributes[i + 1].lineBreakType = HB_NoBreak;
2386                     if (layoutData->string.at(i + 1) == QLatin1Char('&'))
2387                         ++i;
2388                 }
2389             }
2390         }
2391     }
2392
2393     validate();
2394
2395     const int to = count >= 0 && count <= layoutData->string.length() - from
2396             ? from + count
2397             : layoutData->string.length();
2398
2399     if (mode == Qt::ElideNone
2400         || this->width(from, layoutData->string.length()) <= width
2401         || to - from <= 1)
2402         return layoutData->string.mid(from, from - to);
2403
2404     QFixed ellipsisWidth;
2405     QString ellipsisText;
2406     {
2407         QChar ellipsisChar(0x2026);
2408
2409         QFontEngine *fe = fnt.d->engineForScript(QUnicodeTables::Common);
2410
2411         QGlyphLayoutArray<1> ellipsisGlyph;
2412         {
2413             QFontEngine *feForEllipsis = (fe->type() == QFontEngine::Multi)
2414                 ? static_cast<QFontEngineMulti *>(fe)->engine(0)
2415                 : fe;
2416
2417             if (feForEllipsis->type() == QFontEngine::Mac)
2418                 feForEllipsis = fe;
2419
2420             if (feForEllipsis->canRender(&ellipsisChar, 1)) {
2421                 int nGlyphs = 1;
2422                 feForEllipsis->stringToCMap(&ellipsisChar, 1, &ellipsisGlyph, &nGlyphs, 0);
2423             }
2424         }
2425
2426         if (ellipsisGlyph.glyphs[0]) {
2427             ellipsisWidth = ellipsisGlyph.advances_x[0];
2428             ellipsisText = ellipsisChar;
2429         } else {
2430             QString dotDotDot(QLatin1String("..."));
2431
2432             QGlyphLayoutArray<3> glyphs;
2433             int nGlyphs = 3;
2434             if (!fe->stringToCMap(dotDotDot.constData(), 3, &glyphs, &nGlyphs, 0))
2435                 // should never happen...
2436                 return layoutData->string;
2437             for (int i = 0; i < nGlyphs; ++i)
2438                 ellipsisWidth += glyphs.advances_x[i];
2439             ellipsisText = dotDotDot;
2440         }
2441     }
2442
2443     const QFixed availableWidth = width - ellipsisWidth;
2444     if (availableWidth < 0)
2445         return QString();
2446
2447     const HB_CharAttributes *attributes = this->attributes();
2448     if (!attributes)
2449         return QString();
2450
2451     if (mode == Qt::ElideRight) {
2452         QFixed currentWidth;
2453         int pos;
2454         int nextBreak = from;
2455
2456         do {
2457             pos = nextBreak;
2458
2459             ++nextBreak;
2460             while (nextBreak < layoutData->string.length() && !attributes[nextBreak].charStop)
2461                 ++nextBreak;
2462
2463             currentWidth += this->width(pos, nextBreak - pos);
2464         } while (nextBreak < to
2465                  && currentWidth < availableWidth);
2466
2467         if (nextCharJoins(layoutData->string, pos))
2468             ellipsisText.prepend(QChar(0x200d) /* ZWJ */);
2469
2470         return stringMidRetainingBidiCC(layoutData->string,
2471                                         QString(), ellipsisText,
2472                                         from, to,
2473                                         from, pos - from);
2474     } else if (mode == Qt::ElideLeft) {
2475         QFixed currentWidth;
2476         int pos;
2477         int nextBreak = to;
2478
2479         do {
2480             pos = nextBreak;
2481
2482             --nextBreak;
2483             while (nextBreak > 0 && !attributes[nextBreak].charStop)
2484                 --nextBreak;
2485
2486             currentWidth += this->width(nextBreak, pos - nextBreak);
2487         } while (nextBreak > from
2488                  && currentWidth < availableWidth);
2489
2490         if (prevCharJoins(layoutData->string, pos))
2491             ellipsisText.append(QChar(0x200d) /* ZWJ */);
2492
2493         return stringMidRetainingBidiCC(layoutData->string,
2494                                         ellipsisText, QString(),
2495                                         from, to,
2496                                         pos, to - pos);
2497     } else if (mode == Qt::ElideMiddle) {
2498         QFixed leftWidth;
2499         QFixed rightWidth;
2500
2501         int leftPos = from;
2502         int nextLeftBreak = from;
2503
2504         int rightPos = to;
2505         int nextRightBreak = to;
2506
2507         do {
2508             leftPos = nextLeftBreak;
2509             rightPos = nextRightBreak;
2510
2511             ++nextLeftBreak;
2512             while (nextLeftBreak < layoutData->string.length() && !attributes[nextLeftBreak].charStop)
2513                 ++nextLeftBreak;
2514
2515             --nextRightBreak;
2516             while (nextRightBreak > from && !attributes[nextRightBreak].charStop)
2517                 --nextRightBreak;
2518
2519             leftWidth += this->width(leftPos, nextLeftBreak - leftPos);
2520             rightWidth += this->width(nextRightBreak, rightPos - nextRightBreak);
2521         } while (nextLeftBreak < to
2522                  && nextRightBreak > from
2523                  && leftWidth + rightWidth < availableWidth);
2524
2525         if (nextCharJoins(layoutData->string, leftPos))
2526             ellipsisText.prepend(QChar(0x200d) /* ZWJ */);
2527         if (prevCharJoins(layoutData->string, rightPos))
2528             ellipsisText.append(QChar(0x200d) /* ZWJ */);
2529
2530         return layoutData->string.mid(from, leftPos - from) + ellipsisText + layoutData->string.mid(rightPos, to - rightPos);
2531     }
2532
2533     return layoutData->string.mid(from, to - from);
2534 }
2535
2536 void QTextEngine::setBoundary(int strPos) const
2537 {
2538     if (strPos <= 0 || strPos >= layoutData->string.length())
2539         return;
2540
2541     int itemToSplit = 0;
2542     while (itemToSplit < layoutData->items.size() && layoutData->items.at(itemToSplit).position <= strPos)
2543         itemToSplit++;
2544     itemToSplit--;
2545     if (layoutData->items.at(itemToSplit).position == strPos) {
2546         // already a split at the requested position
2547         return;
2548     }
2549     splitItem(itemToSplit, strPos - layoutData->items.at(itemToSplit).position);
2550 }
2551
2552 void QTextEngine::splitItem(int item, int pos) const
2553 {
2554     if (pos <= 0)
2555         return;
2556
2557     layoutData->items.insert(item + 1, layoutData->items[item]);
2558     QScriptItem &oldItem = layoutData->items[item];
2559     QScriptItem &newItem = layoutData->items[item+1];
2560     newItem.position += pos;
2561
2562     if (oldItem.num_glyphs) {
2563         // already shaped, break glyphs aswell
2564         int breakGlyph = logClusters(&oldItem)[pos];
2565
2566         newItem.num_glyphs = oldItem.num_glyphs - breakGlyph;
2567         oldItem.num_glyphs = breakGlyph;
2568         newItem.glyph_data_offset = oldItem.glyph_data_offset + breakGlyph;
2569
2570         for (int i = 0; i < newItem.num_glyphs; i++)
2571             logClusters(&newItem)[i] -= breakGlyph;
2572
2573         QFixed w = 0;
2574         const QGlyphLayout g = shapedGlyphs(&oldItem);
2575         for(int j = 0; j < breakGlyph; ++j)
2576             w += g.advances_x[j] * !g.attributes[j].dontPrint;
2577
2578         newItem.width = oldItem.width - w;
2579         oldItem.width = w;
2580     }
2581
2582 //     qDebug("split at position %d itempos=%d", pos, item);
2583 }
2584
2585 QFixed QTextEngine::calculateTabWidth(int item, QFixed x) const
2586 {
2587     const QScriptItem &si = layoutData->items[item];
2588
2589     QFixed dpiScale = 1;
2590     if (block.docHandle() && block.docHandle()->layout()) {
2591         QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
2592         if (pdev)
2593             dpiScale = QFixed::fromReal(pdev->logicalDpiY() / qreal(qt_defaultDpiY()));
2594     } else {
2595         dpiScale = QFixed::fromReal(fnt.d->dpi / qreal(qt_defaultDpiY()));
2596     }
2597
2598     QList<QTextOption::Tab> tabArray = option.tabs();
2599     if (!tabArray.isEmpty()) {
2600         if (isRightToLeft()) { // rebase the tabArray positions.
2601             QList<QTextOption::Tab> newTabs;
2602             QList<QTextOption::Tab>::Iterator iter = tabArray.begin();
2603             while(iter != tabArray.end()) {
2604                 QTextOption::Tab tab = *iter;
2605                 if (tab.type == QTextOption::LeftTab)
2606                     tab.type = QTextOption::RightTab;
2607                 else if (tab.type == QTextOption::RightTab)
2608                     tab.type = QTextOption::LeftTab;
2609                 newTabs << tab;
2610                 ++iter;
2611             }
2612             tabArray = newTabs;
2613         }
2614         for (int i = 0; i < tabArray.size(); ++i) {
2615             QFixed tab = QFixed::fromReal(tabArray[i].position) * dpiScale;
2616             if (tab > x) {  // this is the tab we need.
2617                 QTextOption::Tab tabSpec = tabArray[i];
2618                 int tabSectionEnd = layoutData->string.count();
2619                 if (tabSpec.type == QTextOption::RightTab || tabSpec.type == QTextOption::CenterTab) {
2620                     // find next tab to calculate the width required.
2621                     tab = QFixed::fromReal(tabSpec.position);
2622                     for (int i=item + 1; i < layoutData->items.count(); i++) {
2623                         const QScriptItem &item = layoutData->items[i];
2624                         if (item.analysis.flags == QScriptAnalysis::TabOrObject) { // found it.
2625                             tabSectionEnd = item.position;
2626                             break;
2627                         }
2628                     }
2629                 }
2630                 else if (tabSpec.type == QTextOption::DelimiterTab)
2631                     // find delimitor character to calculate the width required
2632                     tabSectionEnd = qMax(si.position, layoutData->string.indexOf(tabSpec.delimiter, si.position) + 1);
2633
2634                 if (tabSectionEnd > si.position) {
2635                     QFixed length;
2636                     // Calculate the length of text between this tab and the tabSectionEnd
2637                     for (int i=item; i < layoutData->items.count(); i++) {
2638                         QScriptItem &item = layoutData->items[i];
2639                         if (item.position > tabSectionEnd || item.position <= si.position)
2640                             continue;
2641                         shape(i); // first, lets make sure relevant text is already shaped
2642                         QGlyphLayout glyphs = this->shapedGlyphs(&item);
2643                         const int end = qMin(item.position + item.num_glyphs, tabSectionEnd) - item.position;
2644                         for (int i=0; i < end; i++)
2645                             length += glyphs.advances_x[i] * !glyphs.attributes[i].dontPrint;
2646                         if (end + item.position == tabSectionEnd && tabSpec.type == QTextOption::DelimiterTab) // remove half of matching char
2647                             length -= glyphs.advances_x[end] / 2 * !glyphs.attributes[end].dontPrint;
2648                     }
2649
2650                     switch (tabSpec.type) {
2651                     case QTextOption::CenterTab:
2652                         length /= 2;
2653                         // fall through
2654                     case QTextOption::DelimiterTab:
2655                         // fall through
2656                     case QTextOption::RightTab:
2657                         tab = QFixed::fromReal(tabSpec.position) * dpiScale - length;
2658                         if (tab < x) // default to tab taking no space
2659                             return QFixed();
2660                         break;
2661                     case QTextOption::LeftTab:
2662                         break;
2663                     }
2664                 }
2665                 return tab - x;
2666             }
2667         }
2668     }
2669     QFixed tab = QFixed::fromReal(option.tabStop());
2670     if (tab <= 0)
2671         tab = 80; // default
2672     tab *= dpiScale;
2673     QFixed nextTabPos = ((x / tab).truncate() + 1) * tab;
2674     QFixed tabWidth = nextTabPos - x;
2675
2676     return tabWidth;
2677 }
2678
2679 void QTextEngine::resolveAdditionalFormats() const
2680 {
2681     if (!specialData || specialData->addFormats.isEmpty()
2682         || !block.docHandle()
2683         || !specialData->resolvedFormatIndices.isEmpty())
2684         return;
2685
2686     QTextFormatCollection *collection = this->formats();
2687
2688     specialData->resolvedFormatIndices.clear();
2689     QVector<int> indices(layoutData->items.count());
2690     for (int i = 0; i < layoutData->items.count(); ++i) {
2691         QTextCharFormat f = format(&layoutData->items.at(i));
2692         indices[i] = collection->indexForFormat(f);
2693     }
2694     specialData->resolvedFormatIndices = indices;
2695 }
2696
2697 QFixed QTextEngine::leadingSpaceWidth(const QScriptLine &line)
2698 {
2699     if (!line.hasTrailingSpaces
2700         || (option.flags() & QTextOption::IncludeTrailingSpaces)
2701         || !isRightToLeft())
2702         return QFixed();
2703
2704     return width(line.from + line.length, line.trailingSpaces);
2705 }
2706
2707 QFixed QTextEngine::alignLine(const QScriptLine &line)
2708 {
2709     QFixed x = 0;
2710     justify(line);
2711     // if width is QFIXED_MAX that means we used setNumColumns() and that implicitly makes this line left aligned.
2712     if (!line.justified && line.width != QFIXED_MAX) {
2713         int align = option.alignment();
2714         if (align & Qt::AlignJustify && isRightToLeft())
2715             align = Qt::AlignRight;
2716         if (align & Qt::AlignRight)
2717             x = line.width - (line.textAdvance);
2718         else if (align & Qt::AlignHCenter)
2719             x = (line.width - line.textAdvance)/2;
2720     }
2721     return x;
2722 }
2723
2724 QFixed QTextEngine::offsetInLigature(const QScriptItem *si, int pos, int max, int glyph_pos)
2725 {
2726     unsigned short *logClusters = this->logClusters(si);
2727     const QGlyphLayout &glyphs = shapedGlyphs(si);
2728
2729     int offsetInCluster = 0;
2730     for (int i = pos - 1; i >= 0; i--) {
2731         if (logClusters[i] == glyph_pos)
2732             offsetInCluster++;
2733         else
2734             break;
2735     }
2736
2737     // in the case that the offset is inside a (multi-character) glyph,
2738     // interpolate the position.
2739     if (offsetInCluster > 0) {
2740         int clusterLength = 0;
2741         for (int i = pos - offsetInCluster; i < max; i++) {
2742             if (logClusters[i] == glyph_pos)
2743                 clusterLength++;
2744             else
2745                 break;
2746         }
2747         if (clusterLength)
2748             return glyphs.advances_x[glyph_pos] * offsetInCluster / clusterLength;
2749     }
2750
2751     return 0;
2752 }
2753
2754 // Scan in logClusters[from..to-1] for glyph_pos
2755 int QTextEngine::getClusterLength(unsigned short *logClusters,
2756                                   const HB_CharAttributes *attributes,
2757                                   int from, int to, int glyph_pos, int *start)
2758 {
2759     int clusterLength = 0;
2760     for (int i = from; i < to; i++) {
2761         if (logClusters[i] == glyph_pos && attributes[i].charStop) {
2762             if (*start < 0)
2763                 *start = i;
2764             clusterLength++;
2765         }
2766         else if (clusterLength)
2767             break;
2768     }
2769     return clusterLength;
2770 }
2771
2772 int QTextEngine::positionInLigature(const QScriptItem *si, int end,
2773                                     QFixed x, QFixed edge, int glyph_pos,
2774                                     bool cursorOnCharacter)
2775 {
2776     unsigned short *logClusters = this->logClusters(si);
2777     int clusterStart = -1;
2778     int clusterLength = 0;
2779
2780     if (si->analysis.script != QUnicodeTables::Common &&
2781         si->analysis.script != QUnicodeTables::Greek) {
2782         if (glyph_pos == -1)
2783             return si->position + end;
2784         else {
2785             int i;
2786             for (i = 0; i < end; i++)
2787                 if (logClusters[i] == glyph_pos)
2788                     break;
2789             return si->position + i;
2790         }
2791     }
2792
2793     if (glyph_pos == -1 && end > 0)
2794         glyph_pos = logClusters[end - 1];
2795     else {
2796         if (x <= edge)
2797             glyph_pos--;
2798     }
2799
2800     const HB_CharAttributes *attrs = attributes();
2801     logClusters = this->logClusters(si);
2802     clusterLength = getClusterLength(logClusters, attrs, 0, end, glyph_pos, &clusterStart);
2803
2804     if (clusterLength) {
2805         const QGlyphLayout &glyphs = shapedGlyphs(si);
2806         QFixed glyphWidth = glyphs.effectiveAdvance(glyph_pos);
2807         // the approximate width of each individual element of the ligature
2808         QFixed perItemWidth = glyphWidth / clusterLength;
2809         if (perItemWidth <= 0)
2810             return si->position + clusterStart;
2811         QFixed left = x > edge ? edge : edge - glyphWidth;
2812         int n = ((x - left) / perItemWidth).floor().toInt();
2813         QFixed dist = x - left - n * perItemWidth;
2814         int closestItem = dist > (perItemWidth / 2) ? n + 1 : n;
2815         if (cursorOnCharacter && closestItem > 0)
2816             closestItem--;
2817         int pos = si->position + clusterStart + closestItem;
2818         // Jump to the next charStop
2819         while (pos < end && !attrs[pos].charStop)
2820             pos++;
2821         return pos;
2822     }
2823     return si->position + end;
2824 }
2825
2826 int QTextEngine::previousLogicalPosition(int oldPos) const
2827 {
2828     const HB_CharAttributes *attrs = attributes();
2829     if (!attrs || oldPos < 0)
2830         return oldPos;
2831
2832     if (oldPos <= 0)
2833         return 0;
2834     oldPos--;
2835     while (oldPos && !attrs[oldPos].charStop)
2836         oldPos--;
2837     return oldPos;
2838 }
2839
2840 int QTextEngine::nextLogicalPosition(int oldPos) const
2841 {
2842     const HB_CharAttributes *attrs = attributes();
2843     int len = block.isValid() ? block.length() - 1
2844                               : layoutData->string.length();
2845     Q_ASSERT(len <= layoutData->string.length());
2846     if (!attrs || oldPos < 0 || oldPos >= len)
2847         return oldPos;
2848
2849     oldPos++;
2850     while (oldPos < len && !attrs[oldPos].charStop)
2851         oldPos++;
2852     return oldPos;
2853 }
2854
2855 int QTextEngine::lineNumberForTextPosition(int pos)
2856 {
2857     if (!layoutData)
2858         itemize();
2859     if (pos == layoutData->string.length() && lines.size())
2860         return lines.size() - 1;
2861     for (int i = 0; i < lines.size(); ++i) {
2862         const QScriptLine& line = lines[i];
2863         if (line.from + line.length + line.trailingSpaces > pos)
2864             return i;
2865     }
2866     return -1;
2867 }
2868
2869 void QTextEngine::insertionPointsForLine(int lineNum, QVector<int> &insertionPoints)
2870 {
2871     QTextLineItemIterator iterator(this, lineNum);
2872     bool rtl = isRightToLeft();
2873     bool lastLine = lineNum >= lines.size() - 1;
2874
2875     while (!iterator.atEnd()) {
2876         iterator.next();
2877         const QScriptItem *si = &layoutData->items[iterator.item];
2878         if (si->analysis.bidiLevel % 2) {
2879             int i = iterator.itemEnd - 1, min = iterator.itemStart;
2880             if (lastLine && (rtl ? iterator.atBeginning() : iterator.atEnd()))
2881                 i++;
2882             for (; i >= min; i--)
2883                 insertionPoints.push_back(i);
2884         } else {
2885             int i = iterator.itemStart, max = iterator.itemEnd;
2886             if (lastLine && (rtl ? iterator.atBeginning() : iterator.atEnd()))
2887                 max++;
2888             for (; i < max; i++)
2889                 insertionPoints.push_back(i);
2890         }
2891     }
2892 }
2893
2894 int QTextEngine::endOfLine(int lineNum)
2895 {
2896     QVector<int> insertionPoints;
2897     insertionPointsForLine(lineNum, insertionPoints);
2898
2899     if (insertionPoints.size() > 0)
2900         return insertionPoints.last();
2901     return 0;
2902 }
2903
2904 int QTextEngine::beginningOfLine(int lineNum)
2905 {
2906     QVector<int> insertionPoints;
2907     insertionPointsForLine(lineNum, insertionPoints);
2908
2909     if (insertionPoints.size() > 0)
2910         return insertionPoints.first();
2911     return 0;
2912 }
2913
2914 int QTextEngine::positionAfterVisualMovement(int pos, QTextCursor::MoveOperation op)
2915 {
2916     if (!layoutData)
2917         itemize();
2918
2919     bool moveRight = (op == QTextCursor::Right);
2920     bool alignRight = isRightToLeft();
2921     if (!layoutData->hasBidi)
2922         return moveRight ^ alignRight ? nextLogicalPosition(pos) : previousLogicalPosition(pos);
2923
2924     int lineNum = lineNumberForTextPosition(pos);
2925     Q_ASSERT(lineNum >= 0);
2926
2927     QVector<int> insertionPoints;
2928     insertionPointsForLine(lineNum, insertionPoints);
2929     int i, max = insertionPoints.size();
2930     for (i = 0; i < max; i++)
2931         if (pos == insertionPoints[i]) {
2932             if (moveRight) {
2933                 if (i + 1 < max)
2934                     return insertionPoints[i + 1];
2935             } else {
2936                 if (i > 0)
2937                     return insertionPoints[i - 1];
2938             }
2939
2940             if (moveRight ^ alignRight) {
2941                 if (lineNum + 1 < lines.size())
2942                     return alignRight ? endOfLine(lineNum + 1) : beginningOfLine(lineNum + 1);
2943             }
2944             else {
2945                 if (lineNum > 0)
2946                     return alignRight ? beginningOfLine(lineNum - 1) : endOfLine(lineNum - 1);
2947             }
2948         }
2949
2950     return pos;
2951 }
2952
2953 void QTextEngine::addItemDecoration(QPainter *painter, const QLineF &line, ItemDecorationList *decorationList)
2954 {
2955     if (delayDecorations) {
2956         decorationList->append(ItemDecoration(line.x1(), line.x2(), line.y1(), painter->pen()));
2957     } else {
2958         painter->drawLine(line);
2959     }
2960 }
2961
2962 void QTextEngine::addUnderline(QPainter *painter, const QLineF &line)
2963 {
2964     // qDebug() << "Adding underline:" << line;
2965     addItemDecoration(painter, line, &underlineList);
2966 }
2967
2968 void QTextEngine::addStrikeOut(QPainter *painter, const QLineF &line)
2969 {
2970     addItemDecoration(painter, line, &strikeOutList);
2971 }
2972
2973 void QTextEngine::addOverline(QPainter *painter, const QLineF &line)
2974 {
2975     addItemDecoration(painter, line, &overlineList);
2976 }
2977
2978 void QTextEngine::drawItemDecorationList(QPainter *painter, const ItemDecorationList &decorationList)
2979 {
2980     // qDebug() << "Drawing" << decorationList.size() << "decorations";
2981     if (decorationList.isEmpty())
2982         return;
2983
2984     foreach (const ItemDecoration &decoration, decorationList) {
2985         painter->setPen(decoration.pen);
2986         QLineF line(decoration.x1, decoration.y, decoration.x2, decoration.y);
2987         painter->drawLine(line);
2988     }
2989 }
2990
2991 void QTextEngine::drawDecorations(QPainter *painter)
2992 {
2993     QPen oldPen = painter->pen();
2994
2995     adjustUnderlines();
2996     drawItemDecorationList(painter, underlineList);
2997     drawItemDecorationList(painter, strikeOutList);
2998     drawItemDecorationList(painter, overlineList);
2999
3000     painter->setPen(oldPen);
3001     clearDecorations();
3002 }
3003
3004 void QTextEngine::clearDecorations()
3005 {
3006     underlineList.clear();
3007     strikeOutList.clear();
3008     overlineList.clear();
3009 }
3010
3011 void QTextEngine::adjustUnderlines()
3012 {
3013     // qDebug() << __PRETTY_FUNCTION__ << underlineList.count() << "underlines";
3014     if (underlineList.isEmpty())
3015         return;
3016
3017     ItemDecorationList::iterator start = underlineList.begin();
3018     ItemDecorationList::iterator end   = underlineList.end();
3019     ItemDecorationList::iterator it = start;
3020     qreal underlinePos = start->y;
3021     qreal penWidth = start->pen.widthF();
3022     qreal lastLineEnd = start->x1;
3023
3024     while (it != end) {
3025         if (qFuzzyCompare(lastLineEnd, it->x1)) { // no gap between underlines
3026             underlinePos = qMax(underlinePos, it->y);
3027             penWidth = qMax(penWidth, it->pen.widthF());
3028         } else { // gap between this and the last underline
3029             adjustUnderlines(start, it, underlinePos, penWidth);
3030             start = it;
3031             underlinePos = start->y;
3032             penWidth = start->pen.widthF();
3033         }
3034         lastLineEnd = it->x2;
3035         ++it;
3036     }
3037
3038     adjustUnderlines(start, end, underlinePos, penWidth);
3039 }
3040
3041 void QTextEngine::adjustUnderlines(ItemDecorationList::iterator start,
3042                                    ItemDecorationList::iterator end,
3043                                    qreal underlinePos, qreal penWidth)
3044 {
3045     for (ItemDecorationList::iterator it = start; it != end; ++it) {
3046         it->y = underlinePos;
3047         it->pen.setWidthF(penWidth);
3048     }
3049 }
3050
3051 QStackTextEngine::QStackTextEngine(const QString &string, const QFont &f)
3052     : QTextEngine(string, f),
3053       _layoutData(string, _memory, MemSize)
3054 {
3055     stackEngine = true;
3056     layoutData = &_layoutData;
3057 }
3058
3059 QTextItemInt::QTextItemInt(const QScriptItem &si, QFont *font, const QTextCharFormat &format)
3060     : justified(false), underlineStyle(QTextCharFormat::NoUnderline), charFormat(format),
3061       num_chars(0), chars(0), logClusters(0), f(0), fontEngine(0)
3062 {
3063     f = font;
3064     fontEngine = f->d->engineForScript(si.analysis.script);
3065     Q_ASSERT(fontEngine);
3066
3067     initWithScriptItem(si);
3068 }
3069
3070 QTextItemInt::QTextItemInt(const QGlyphLayout &g, QFont *font, const QChar *chars_, int numChars, QFontEngine *fe, const QTextCharFormat &format)
3071     : flags(0), justified(false), underlineStyle(QTextCharFormat::NoUnderline), charFormat(format),
3072       num_chars(numChars), chars(chars_), logClusters(0), f(font),  glyphs(g), fontEngine(fe)
3073 {
3074 }
3075
3076 // Fix up flags and underlineStyle with given info
3077 void QTextItemInt::initWithScriptItem(const QScriptItem &si)
3078 {
3079     // explicitly initialize flags so that initFontAttributes can be called
3080     // multiple times on the same TextItem
3081     flags = 0;
3082     if (si.analysis.bidiLevel %2)
3083         flags |= QTextItem::RightToLeft;
3084     ascent = si.ascent;
3085     descent = si.descent;
3086
3087     if (charFormat.hasProperty(QTextFormat::TextUnderlineStyle)) {
3088         underlineStyle = charFormat.underlineStyle();
3089     } else if (charFormat.boolProperty(QTextFormat::FontUnderline)
3090                || f->d->underline) {
3091         underlineStyle = QTextCharFormat::SingleUnderline;
3092     }
3093
3094     // compat
3095     if (underlineStyle == QTextCharFormat::SingleUnderline)
3096         flags |= QTextItem::Underline;
3097
3098     if (f->d->overline || charFormat.fontOverline())
3099         flags |= QTextItem::Overline;
3100     if (f->d->strikeOut || charFormat.fontStrikeOut())
3101         flags |= QTextItem::StrikeOut;
3102 }
3103
3104 QTextItemInt QTextItemInt::midItem(QFontEngine *fontEngine, int firstGlyphIndex, int numGlyphs) const
3105 {
3106     QTextItemInt ti = *this;
3107     const int end = firstGlyphIndex + numGlyphs;
3108     ti.glyphs = glyphs.mid(firstGlyphIndex, numGlyphs);
3109     ti.fontEngine = fontEngine;
3110
3111     if (logClusters && chars) {
3112         const int logClusterOffset = logClusters[0];
3113         while (logClusters[ti.chars - chars] - logClusterOffset < firstGlyphIndex)
3114             ++ti.chars;
3115
3116         ti.logClusters += (ti.chars - chars);
3117
3118         ti.num_chars = 0;
3119         int char_start = ti.chars - chars;
3120         while (char_start + ti.num_chars < num_chars && ti.logClusters[ti.num_chars] - logClusterOffset < end)
3121             ++ti.num_chars;
3122     }
3123     return ti;
3124 }
3125
3126
3127 QTransform qt_true_matrix(qreal w, qreal h, QTransform x)
3128 {
3129     QRectF rect = x.mapRect(QRectF(0, 0, w, h));
3130     return x * QTransform::fromTranslate(-rect.x(), -rect.y());
3131 }
3132
3133
3134 glyph_metrics_t glyph_metrics_t::transformed(const QTransform &matrix) const
3135 {
3136     if (matrix.type() < QTransform::TxTranslate)
3137         return *this;
3138
3139     glyph_metrics_t m = *this;
3140
3141     qreal w = width.toReal();
3142     qreal h = height.toReal();
3143     QTransform xform = qt_true_matrix(w, h, matrix);
3144
3145     QRectF rect(0, 0, w, h);
3146     rect = xform.mapRect(rect);
3147     m.width = QFixed::fromReal(rect.width());
3148     m.height = QFixed::fromReal(rect.height());
3149
3150     QLineF l = xform.map(QLineF(x.toReal(), y.toReal(), xoff.toReal(), yoff.toReal()));
3151
3152     m.x = QFixed::fromReal(l.x1());
3153     m.y = QFixed::fromReal(l.y1());
3154
3155     // The offset is relative to the baseline which is why we use dx/dy of the line
3156     m.xoff = QFixed::fromReal(l.dx());
3157     m.yoff = QFixed::fromReal(l.dy());
3158
3159     return m;
3160 }
3161
3162 QTextLineItemIterator::QTextLineItemIterator(QTextEngine *_eng, int _lineNum, const QPointF &pos,
3163                                              const QTextLayout::FormatRange *_selection)
3164     : eng(_eng),
3165       line(eng->lines[_lineNum]),
3166       si(0),
3167       lineNum(_lineNum),
3168       lineEnd(line.from + line.length),
3169       firstItem(eng->findItem(line.from)),
3170       lastItem(eng->findItem(lineEnd - 1)),
3171       nItems((firstItem >= 0 && lastItem >= firstItem)? (lastItem-firstItem+1) : 0),
3172       logicalItem(-1),
3173       item(-1),
3174       visualOrder(nItems),
3175       levels(nItems),
3176       selection(_selection)
3177 {
3178     pos_x = x = QFixed::fromReal(pos.x());
3179
3180     x += line.x;
3181
3182     x += eng->alignLine(line);
3183
3184     for (int i = 0; i < nItems; ++i)
3185         levels[i] = eng->layoutData->items[i+firstItem].analysis.bidiLevel;
3186     QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data());
3187
3188     eng->shapeLine(line);
3189 }
3190
3191 QScriptItem &QTextLineItemIterator::next()
3192 {
3193     x += itemWidth;
3194
3195     ++logicalItem;
3196     item = visualOrder[logicalItem] + firstItem;
3197     itemLength = eng->length(item);
3198     si = &eng->layoutData->items[item];
3199     if (!si->num_glyphs)
3200         eng->shape(item);
3201
3202     if (si->analysis.flags >= QScriptAnalysis::TabOrObject) {
3203         itemWidth = si->width;
3204         return *si;
3205     }
3206
3207     unsigned short *logClusters = eng->logClusters(si);
3208     QGlyphLayout glyphs = eng->shapedGlyphs(si);
3209
3210     itemStart = qMax(line.from, si->position);
3211     glyphsStart = logClusters[itemStart - si->position];
3212     if (lineEnd < si->position + itemLength) {
3213         itemEnd = lineEnd;
3214         glyphsEnd = logClusters[itemEnd-si->position];
3215     } else {
3216         itemEnd = si->position + itemLength;
3217         glyphsEnd = si->num_glyphs;
3218     }
3219     // show soft-hyphen at line-break
3220     if (si->position + itemLength >= lineEnd
3221         && eng->layoutData->string.at(lineEnd - 1) == 0x00ad)
3222         glyphs.attributes[glyphsEnd - 1].dontPrint = false;
3223
3224     itemWidth = 0;
3225     for (int g = glyphsStart; g < glyphsEnd; ++g)
3226         itemWidth += glyphs.effectiveAdvance(g);
3227
3228     return *si;
3229 }
3230
3231 bool QTextLineItemIterator::getSelectionBounds(QFixed *selectionX, QFixed *selectionWidth) const
3232 {
3233     *selectionX = *selectionWidth = 0;
3234
3235     if (!selection)
3236         return false;
3237
3238     if (si->analysis.flags >= QScriptAnalysis::TabOrObject) {
3239         if (si->position >= selection->start + selection->length
3240             || si->position + itemLength <= selection->start)
3241             return false;
3242
3243         *selectionX = x;
3244         *selectionWidth = itemWidth;
3245     } else {
3246         unsigned short *logClusters = eng->logClusters(si);
3247         QGlyphLayout glyphs = eng->shapedGlyphs(si);
3248
3249         int from = qMax(itemStart, selection->start) - si->position;
3250         int to = qMin(itemEnd, selection->start + selection->length) - si->position;
3251         if (from >= to)
3252             return false;
3253
3254         int start_glyph = logClusters[from];
3255         int end_glyph = (to == eng->length(item)) ? si->num_glyphs : logClusters[to];
3256         QFixed soff;
3257         QFixed swidth;
3258         if (si->analysis.bidiLevel %2) {
3259             for (int g = glyphsEnd - 1; g >= end_glyph; --g)
3260                 soff += glyphs.effectiveAdvance(g);
3261             for (int g = end_glyph - 1; g >= start_glyph; --g)
3262                 swidth += glyphs.effectiveAdvance(g);
3263         } else {
3264             for (int g = glyphsStart; g < start_glyph; ++g)
3265                 soff += glyphs.effectiveAdvance(g);
3266             for (int g = start_glyph; g < end_glyph; ++g)
3267                 swidth += glyphs.effectiveAdvance(g);
3268         }
3269
3270         // If the starting character is in the middle of a ligature,
3271         // selection should only contain the right part of that ligature
3272         // glyph, so we need to get the width of the left part here and
3273         // add it to *selectionX
3274         QFixed leftOffsetInLigature = eng->offsetInLigature(si, from, to, start_glyph);
3275         *selectionX = x + soff + leftOffsetInLigature;
3276         *selectionWidth = swidth - leftOffsetInLigature;
3277         // If the ending character is also part of a ligature, swidth does
3278         // not contain that part yet, we also need to find out the width of
3279         // that left part
3280         *selectionWidth += eng->offsetInLigature(si, to, eng->length(item), end_glyph);
3281     }
3282     return true;
3283 }
3284
3285 QT_END_NAMESPACE