FCL/sf/mw/qt: comparison src/gui/text/qtextengine.cpp

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+:1918ee327afb
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "qdebug.h"
+#include "qtextformat.h"
+#include "qtextformat_p.h"
+#include "qtextengine_p.h"
+#include "qabstracttextdocumentlayout.h"
+#include "qtextlayout.h"
+#include "qtextboundaryfinder.h"
+#include "qvarlengtharray.h"
+#include "qfont.h"
+#include "qfont_p.h"
+#include "qfontengine_p.h"
+#include "qstring.h"
+#include <private/qunicodetables_p.h>
+#include "qtextdocument_p.h"
+#include <qapplication.h>
+#include <stdlib.h>
+QT_BEGIN_NAMESPACE
+namespace {
+// Helper class used in QTextEngine::itemize
+// keep it out here to allow us to keep supporting various compilers.
+class Itemizer {
+public:
+Itemizer(const QString &string, const QScriptAnalysis *analysis, QScriptItemArray &items)
+: m_string(string),
+m_analysis(analysis),
+m_items(items),
+m_splitter(0)
+{
+}
+~Itemizer()
+{
+delete m_splitter;
+}
+/// generate the script items
+/// The caps parameter is used to choose the algoritm of splitting text and assiging roles to the textitems
+void generate(int start, int length, QFont::Capitalization caps)
+{
+if ((int)caps == (int)QFont::SmallCaps)
+generateScriptItemsSmallCaps(m_string.utf16(), start, length);
+else if(caps == QFont::Capitalize)
+generateScriptItemsCapitalize(start, length);
+else if(caps != QFont::MixedCase) {
+generateScriptItemsAndChangeCase(start, length,
+caps == QFont::AllLowercase ? QScriptAnalysis::Lowercase : QScriptAnalysis::Uppercase);
+}
+else
+generateScriptItems(start, length);
+}
+private:
+enum { MaxItemLength = 4096 };
+void generateScriptItemsAndChangeCase(int start, int length, QScriptAnalysis::Flags flags)
+{
+generateScriptItems(start, length);
+if (m_items.isEmpty()) // the next loop won't work in that case
+return;
+QScriptItemArray::Iterator iter = m_items.end();
+do {
+iter--;
+if (iter->analysis.flags < QScriptAnalysis::TabOrObject)
+iter->analysis.flags = flags;
+} while (iter->position > start);
+}
+void generateScriptItems(int start, int length)
+{
+if (!length)
+return;
+const int end = start + length;
+for (int i = start + 1; i < end; ++i) {
+if ((m_analysis[i] == m_analysis[start])
+&& m_analysis[i].flags < QScriptAnalysis::SpaceTabOrObject
+&& i - start < MaxItemLength)
+continue;
+m_items.append(QScriptItem(start, m_analysis[start]));
+start = i;
+}
+m_items.append(QScriptItem(start, m_analysis[start]));
+}
+void generateScriptItemsCapitalize(int start, int length)
+{
+if (!length)
+return;
+if (!m_splitter)
+m_splitter = new QTextBoundaryFinder(QTextBoundaryFinder::Word,
+m_string.constData(), m_string.length(),
+/*buffer*/0, /*buffer size*/0);
+m_splitter->setPosition(start);
+QScriptAnalysis itemAnalysis = m_analysis[start];
+if (m_splitter->boundaryReasons() & QTextBoundaryFinder::StartWord) {
+itemAnalysis.flags = QScriptAnalysis::Uppercase;
+m_splitter->toNextBoundary();
+}
+const int end = start + length;
+for (int i = start + 1; i < end; ++i) {
+bool atWordBoundary = false;
+if (i == m_splitter->position()) {
+if (m_splitter->boundaryReasons() & QTextBoundaryFinder::StartWord
+&& m_analysis[i].flags < QScriptAnalysis::TabOrObject)
+atWordBoundary = true;
+m_splitter->toNextBoundary();
+}
+if (m_analysis[i] == itemAnalysis
+&& m_analysis[i].flags < QScriptAnalysis::TabOrObject
+&& !atWordBoundary
+&& i - start < MaxItemLength)
+continue;
+m_items.append(QScriptItem(start, itemAnalysis));
+start = i;
+itemAnalysis = m_analysis[start];
+if (atWordBoundary)
+itemAnalysis.flags = QScriptAnalysis::Uppercase;
+}
+m_items.append(QScriptItem(start, itemAnalysis));
+}
+void generateScriptItemsSmallCaps(const ushort *uc, int start, int length)
+{
+if (!length)
+return;
+bool lower = (QChar::category(uc[start]) == QChar::Letter_Lowercase);
+const int end = start + length;
+// split text into parts that are already uppercase and parts that are lowercase, and mark the latter to be uppercased later.
+for (int i = start + 1; i < end; ++i) {
+bool l = (QChar::category(uc[i]) == QChar::Letter_Lowercase);
+if ((m_analysis[i] == m_analysis[start])
+&& m_analysis[i].flags < QScriptAnalysis::TabOrObject
+&& l == lower
+&& i - start < MaxItemLength)
+continue;
+m_items.append(QScriptItem(start, m_analysis[start]));
+if (lower)
+m_items.last().analysis.flags = QScriptAnalysis::SmallCaps;
+start = i;
+lower = l;
+}
+m_items.append(QScriptItem(start, m_analysis[start]));
+if (lower)
+m_items.last().analysis.flags = QScriptAnalysis::SmallCaps;
+}
+const QString &m_string;
+const QScriptAnalysis * const m_analysis;
+QScriptItemArray &m_items;
+QTextBoundaryFinder *m_splitter;
+};
+}
+// ----------------------------------------------------------------------------
+//
+// The BiDi algorithm
+//
+// ----------------------------------------------------------------------------
+#define BIDI_DEBUG 0
+#if (BIDI_DEBUG >= 1)
+QT_BEGIN_INCLUDE_NAMESPACE
+#include <iostream>
+QT_END_INCLUDE_NAMESPACE
+using namespace std;
+static const char *directions[] = {
+"DirL", "DirR", "DirEN", "DirES", "DirET", "DirAN", "DirCS", "DirB", "DirS", "DirWS", "DirON",
+"DirLRE", "DirLRO", "DirAL", "DirRLE", "DirRLO", "DirPDF", "DirNSM", "DirBN"
+};
+#endif
+struct QBidiStatus {
+QBidiStatus() {
+eor = QChar::DirON;
+lastStrong = QChar::DirON;
+last = QChar:: DirON;
+dir = QChar::DirON;
+}
+QChar::Direction eor;
+QChar::Direction lastStrong;
+QChar::Direction last;
+QChar::Direction dir;
+};
+enum { MaxBidiLevel = 61 };
+struct QBidiControl {
+inline QBidiControl(bool rtl)
+: cCtx(0), base(rtl ? 1 : 0), level(rtl ? 1 : 0), override(false) {}
+inline void embed(bool rtl, bool o = false) {
+unsigned int toAdd = 1;
+if((level%2 != 0) == rtl ) {
+++toAdd;
+}
+if (level + toAdd <= MaxBidiLevel) {
+ctx[cCtx].level = level;
+ctx[cCtx].override = override;
+cCtx++;
+override = o;
+level += toAdd;
+}
+}
+inline bool canPop() const { return cCtx != 0; }
+inline void pdf() {
+Q_ASSERT(cCtx);
+--cCtx;
+level = ctx[cCtx].level;
+override = ctx[cCtx].override;
+}
+inline QChar::Direction basicDirection() const {
+return (base ? QChar::DirR : QChar:: DirL);
+}
+inline unsigned int baseLevel() const {
+return base;
+}
+inline QChar::Direction direction() const {
+return ((level%2) ? QChar::DirR : QChar:: DirL);
+}
+struct {
+unsigned int level;
+bool override;
+} ctx[MaxBidiLevel];
+unsigned int cCtx;
+const unsigned int base;
+unsigned int level;
+bool override;
+};
+static void appendItems(QScriptAnalysis *analysis, int &start, int &stop, const QBidiControl &control, QChar::Direction dir)
+{
+if (start > stop)
+return;
+int level = control.level;
+if(dir != QChar::DirON && !control.override) {
+// add level of run (cases I1 & I2)
+if(level % 2) {
+if(dir == QChar::DirL || dir == QChar::DirAN || dir == QChar::DirEN)
+level++;
+} else {
+if(dir == QChar::DirR)
+level++;
+else if(dir == QChar::DirAN || dir == QChar::DirEN)
+level += 2;
+}
+}
+#if (BIDI_DEBUG >= 1)
+qDebug("new run: dir=%s from %d, to %d level = %d override=%d", directions[dir], start, stop, level, control.override);
+#endif
+QScriptAnalysis *s = analysis + start;
+const QScriptAnalysis *e = analysis + stop;
+while (s <= e) {
+s->bidiLevel = level;
+++s;
+}
+++stop;
+start = stop;
+}
+// creates the next QScript items.
+static bool bidiItemize(QTextEngine *engine, QScriptAnalysis *analysis, QBidiControl &control)
+{
+bool rightToLeft = (control.basicDirection() == 1);
+bool hasBidi = rightToLeft;
+#if BIDI_DEBUG >= 2
+qDebug() << "bidiItemize: rightToLeft=" << rightToLeft << engine->layoutData->string;
+#endif
+int sor = 0;
+int eor = -1;
+int length = engine->layoutData->string.length();
+const ushort *unicode = (const ushort *)engine->layoutData->string.unicode();
+int current = 0;
+QChar::Direction dir = rightToLeft ? QChar::DirR : QChar::DirL;
+QBidiStatus status;
+QChar::Direction sdir = QChar::direction(*unicode);
+if (sdir != QChar::DirL && sdir != QChar::DirR && sdir != QChar::DirEN && sdir != QChar::DirAN)
+sdir = QChar::DirON;
+else
+dir = QChar::DirON;
+status.eor = sdir;
+status.lastStrong = rightToLeft ? QChar::DirR : QChar::DirL;
+status.last = status.lastStrong;
+status.dir = sdir;
+while (current <= length) {
+QChar::Direction dirCurrent;
+if (current == (int)length)
+dirCurrent = control.basicDirection();
+else
+dirCurrent = QChar::direction(unicode[current]);
+#if (BIDI_DEBUG >= 2)
+//         qDebug() << "pos=" << current << " dir=" << directions[dir]
+//                  << " current=" << directions[dirCurrent] << " last=" << directions[status.last]
+//                  << " eor=" << eor << '/' << directions[status.eor]
+//                  << " sor=" << sor << " lastStrong="
+//                  << directions[status.lastStrong]
+//                  << " level=" << (int)control.level << " override=" << (bool)control.override;
+#endif
+switch(dirCurrent) {
+// embedding and overrides (X1-X9 in the BiDi specs)
+case QChar::DirRLE:
+case QChar::DirRLO:
+case QChar::DirLRE:
+case QChar::DirLRO:
+{
+bool rtl = (dirCurrent == QChar::DirRLE || dirCurrent == QChar::DirRLO);
+hasBidi |= rtl;
+bool override = (dirCurrent == QChar::DirLRO || dirCurrent == QChar::DirRLO);
+unsigned int level = control.level+1;
+if ((level%2 != 0) == rtl) ++level;
+if(level < MaxBidiLevel) {
+eor = current-1;
+appendItems(analysis, sor, eor, control, dir);
+eor = current;
+control.embed(rtl, override);
+QChar::Direction edir = (rtl ? QChar::DirR : QChar::DirL);
+dir = status.eor = edir;
+status.lastStrong = edir;
+}
+break;
+}
+case QChar::DirPDF:
+{
+if (control.canPop()) {
+if (dir != control.direction()) {
+eor = current-1;
+appendItems(analysis, sor, eor, control, dir);
+dir = control.direction();
+}
+eor = current;
+appendItems(analysis, sor, eor, control, dir);
+control.pdf();
+dir = QChar::DirON; status.eor = QChar::DirON;
+status.last = control.direction();
+if (control.override)
+dir = control.direction();
+else
+dir = QChar::DirON;
+status.lastStrong = control.direction();
+}
+break;
+}
+// strong types
+case QChar::DirL:
+if(dir == QChar::DirON)
+dir = QChar::DirL;
+switch(status.last)
+{
+case QChar::DirL:
+eor = current; status.eor = QChar::DirL; break;
+case QChar::DirR:
+case QChar::DirAL:
+case QChar::DirEN:
+case QChar::DirAN:
+if (eor >= 0) {
+appendItems(analysis, sor, eor, control, dir);
+dir = eor < length ? QChar::direction(unicode[eor]) : control.basicDirection();
+status.eor = dir;
+} else {
+eor = current; status.eor = dir;
+}
+break;
+case QChar::DirES:
+case QChar::DirET:
+case QChar::DirCS:
+case QChar::DirBN:
+case QChar::DirB:
+case QChar::DirS:
+case QChar::DirWS:
+case QChar::DirON:
+if(dir != QChar::DirL) {
+//last stuff takes embedding dir
+if(control.direction() == QChar::DirR) {
+if(status.eor != QChar::DirR) {
+// AN or EN
+appendItems(analysis, sor, eor, control, dir);
+status.eor = QChar::DirON;
+dir = QChar::DirR;
+}
+eor = current - 1;
+appendItems(analysis, sor, eor, control, dir);
+dir = eor < length ? QChar::direction(unicode[eor]) : control.basicDirection();
+status.eor = dir;
+} else {
+if(status.eor != QChar::DirL) {
+appendItems(analysis, sor, eor, control, dir);
+status.eor = QChar::DirON;
+dir = QChar::DirL;
+} else {
+eor = current; status.eor = QChar::DirL; break;
+}
+}
+} else {
+eor = current; status.eor = QChar::DirL;
+}
+default:
+break;
+}
+status.lastStrong = QChar::DirL;
+break;
+case QChar::DirAL:
+case QChar::DirR:
+hasBidi = true;
+if(dir == QChar::DirON) dir = QChar::DirR;
+switch(status.last)
+{
+case QChar::DirL:
+case QChar::DirEN:
+case QChar::DirAN:
+if (eor >= 0)
+appendItems(analysis, sor, eor, control, dir);
+// fall through
+case QChar::DirR:
+case QChar::DirAL:
+dir = QChar::DirR; eor = current; status.eor = QChar::DirR; break;
+case QChar::DirES:
+case QChar::DirET:
+case QChar::DirCS:
+case QChar::DirBN:
+case QChar::DirB:
+case QChar::DirS:
+case QChar::DirWS:
+case QChar::DirON:
+if(status.eor != QChar::DirR && status.eor != QChar::DirAL) {
+//last stuff takes embedding dir
+if(control.direction() == QChar::DirR
+|| status.lastStrong == QChar::DirR || status.lastStrong == QChar::DirAL) {
+appendItems(analysis, sor, eor, control, dir);
+dir = QChar::DirR; status.eor = QChar::DirON;
+eor = current;
+} else {
+eor = current - 1;
+appendItems(analysis, sor, eor, control, dir);
+dir = QChar::DirR; status.eor = QChar::DirON;
+}
+} else {
+eor = current; status.eor = QChar::DirR;
+}
+default:
+break;
+}
+status.lastStrong = dirCurrent;
+break;
+// weak types:
+case QChar::DirNSM:
+if (eor == current-1)
+eor = current;
+break;
+case QChar::DirEN:
+// if last strong was AL change EN to AN
+if(status.lastStrong != QChar::DirAL) {
+if(dir == QChar::DirON) {
+if(status.lastStrong == QChar::DirL)
+dir = QChar::DirL;
+else
+dir = QChar::DirEN;
+}
+switch(status.last)
+{
+case QChar::DirET:
+if (status.lastStrong == QChar::DirR || status.lastStrong == QChar::DirAL) {
+appendItems(analysis, sor, eor, control, dir);
+status.eor = QChar::DirON;
+dir = QChar::DirAN;
+}
+// fall through
+case QChar::DirEN:
+case QChar::DirL:
+eor = current;
+status.eor = dirCurrent;
+break;
+case QChar::DirR:
+case QChar::DirAL:
+case QChar::DirAN:
+if (eor >= 0)
+appendItems(analysis, sor, eor, control, dir);
+else
+eor = current;
+status.eor = QChar::DirEN;
+dir = QChar::DirAN; break;
+case QChar::DirES:
+case QChar::DirCS:
+if(status.eor == QChar::DirEN || dir == QChar::DirAN) {
+eor = current; break;
+}
+case QChar::DirBN:
+case QChar::DirB:
+case QChar::DirS:
+case QChar::DirWS:
+case QChar::DirON:
+if(status.eor == QChar::DirR) {
+// neutrals go to R
+eor = current - 1;
+appendItems(analysis, sor, eor, control, dir);
+dir = QChar::DirON; status.eor = QChar::DirEN;
+dir = QChar::DirAN;
+}
+else if(status.eor == QChar::DirL ||
+(status.eor == QChar::DirEN && status.lastStrong == QChar::DirL)) {
+eor = current; status.eor = dirCurrent;
+} else {
+// numbers on both sides, neutrals get right to left direction
+if(dir != QChar::DirL) {
+appendItems(analysis, sor, eor, control, dir);
+dir = QChar::DirON; status.eor = QChar::DirON;
+eor = current - 1;
+dir = QChar::DirR;
+appendItems(analysis, sor, eor, control, dir);
+dir = QChar::DirON; status.eor = QChar::DirON;
+dir = QChar::DirAN;
+} else {
+eor = current; status.eor = dirCurrent;
+}
+}
+default:
+break;
+}
+break;
+}
+case QChar::DirAN:
+hasBidi = true;
+dirCurrent = QChar::DirAN;
+if(dir == QChar::DirON) dir = QChar::DirAN;
+switch(status.last)
+{
+case QChar::DirL:
+case QChar::DirAN:
+eor = current; status.eor = QChar::DirAN; break;
+case QChar::DirR:
+case QChar::DirAL:
+case QChar::DirEN:
+if (eor >= 0){
+appendItems(analysis, sor, eor, control, dir);
+} else {
+eor = current;
+}
+dir = QChar::DirON; status.eor = QChar::DirAN;
+break;
+case QChar::DirCS:
+if(status.eor == QChar::DirAN) {
+eor = current; break;
+}
+case QChar::DirES:
+case QChar::DirET:
+case QChar::DirBN:
+case QChar::DirB:
+case QChar::DirS:
+case QChar::DirWS:
+case QChar::DirON:
+if(status.eor == QChar::DirR) {
+// neutrals go to R
+eor = current - 1;
+appendItems(analysis, sor, eor, control, dir);
+status.eor = QChar::DirAN;
+dir = QChar::DirAN;
+} else if(status.eor == QChar::DirL ||
+(status.eor == QChar::DirEN && status.lastStrong == QChar::DirL)) {
+eor = current; status.eor = dirCurrent;
+} else {
+// numbers on both sides, neutrals get right to left direction
+if(dir != QChar::DirL) {
+appendItems(analysis, sor, eor, control, dir);
+status.eor = QChar::DirON;
+eor = current - 1;
+dir = QChar::DirR;
+appendItems(analysis, sor, eor, control, dir);
+status.eor = QChar::DirAN;
+dir = QChar::DirAN;
+} else {
+eor = current; status.eor = dirCurrent;
+}
+}
+default:
+break;
+}
+break;
+case QChar::DirES:
+case QChar::DirCS:
+break;
+case QChar::DirET:
+if(status.last == QChar::DirEN) {
+dirCurrent = QChar::DirEN;
+eor = current; status.eor = dirCurrent;
+}
+break;
+// boundary neutrals should be ignored
+case QChar::DirBN:
+break;
+// neutrals
+case QChar::DirB:
+// ### what do we do with newline and paragraph separators that come to here?
+break;
+case QChar::DirS:
+// ### implement rule L1
+break;
+case QChar::DirWS:
+case QChar::DirON:
+break;
+default:
+break;
+}
+//qDebug() << "     after: dir=" << //        dir << " current=" << dirCurrent << " last=" << status.last << " eor=" << status.eor << " lastStrong=" << status.lastStrong << " embedding=" << control.direction();
+if(current >= (int)length) break;
+// set status.last as needed.
+switch(dirCurrent) {
+case QChar::DirET:
+case QChar::DirES:
+case QChar::DirCS:
+case QChar::DirS:
+case QChar::DirWS:
+case QChar::DirON:
+switch(status.last)
+{
+case QChar::DirL:
+case QChar::DirR:
+case QChar::DirAL:
+case QChar::DirEN:
+case QChar::DirAN:
+status.last = dirCurrent;
+break;
+default:
+status.last = QChar::DirON;
+}
+break;
+case QChar::DirNSM:
+case QChar::DirBN:
+// ignore these
+break;
+case QChar::DirLRO:
+case QChar::DirLRE:
+status.last = QChar::DirL;
+break;
+case QChar::DirRLO:
+case QChar::DirRLE:
+status.last = QChar::DirR;
+break;
+case QChar::DirEN:
+if (status.last == QChar::DirL) {
+status.last = QChar::DirL;
+break;
+}
+// fall through
+default:
+status.last = dirCurrent;
+}
+++current;
+}
+#if (BIDI_DEBUG >= 1)
+qDebug() << "reached end of line current=" << current << ", eor=" << eor;
+#endif
+eor = current - 1; // remove dummy char
+if (sor <= eor)
+appendItems(analysis, sor, eor, control, dir);
+return hasBidi;
+}
+void QTextEngine::bidiReorder(int numItems, const quint8 *levels, int *visualOrder)
+{
+// first find highest and lowest levels
+quint8 levelLow = 128;
+quint8 levelHigh = 0;
+int i = 0;
+while (i < numItems) {
+//printf("level = %d\n", r->level);
+if (levels[i] > levelHigh)
+levelHigh = levels[i];
+if (levels[i] < levelLow)
+levelLow = levels[i];
+i++;
+}
+// implements reordering of the line (L2 according to BiDi spec):
+// L2. From the highest level found in the text to the lowest odd level on each line,
+// reverse any contiguous sequence of characters that are at that level or higher.
+// reversing is only done up to the lowest odd level
+if(!(levelLow%2)) levelLow++;
+#if (BIDI_DEBUG >= 1)
+//     qDebug() << "reorderLine: lineLow = " << (uint)levelLow << ", lineHigh = " << (uint)levelHigh;
+#endif
+int count = numItems - 1;
+for (i = 0; i < numItems; i++)
+visualOrder[i] = i;
+while(levelHigh >= levelLow) {
+int i = 0;
+while (i < count) {
+while(i < count && levels[i] < levelHigh) i++;
+int start = i;
+while(i <= count && levels[i] >= levelHigh) i++;
+int end = i-1;
+if(start != end) {
+//qDebug() << "reversing from " << start << " to " << end;
+for(int j = 0; j < (end-start+1)/2; j++) {
+int tmp = visualOrder[start+j];
+visualOrder[start+j] = visualOrder[end-j];
+visualOrder[end-j] = tmp;
+}
+}
+i++;
+}
+levelHigh--;
+}
+#if (BIDI_DEBUG >= 1)
+//     qDebug() << "visual order is:";
+//     for (i = 0; i < numItems; i++)
+//         qDebug() << visualOrder[i];
+#endif
+}
+QT_BEGIN_INCLUDE_NAMESPACE
+#if defined(Q_WS_X11) || defined (Q_WS_QWS)
+#   include "qfontengine_ft_p.h"
+#elif defined(Q_WS_MAC)
+# include "qtextengine_mac.cpp"
+#endif
+#include <private/qharfbuzz_p.h>
+QT_END_INCLUDE_NAMESPACE
+// ask the font engine to find out which glyphs (as an index in the specific font) to use for the text in one item.
+static bool stringToGlyphs(HB_ShaperItem *item, QGlyphLayout *glyphs, QFontEngine *fontEngine)
+{
+int nGlyphs = item->num_glyphs;
+QTextEngine::ShaperFlags shaperFlags(QTextEngine::GlyphIndicesOnly);
+if (item->item.bidiLevel % 2)
+shaperFlags |= QTextEngine::RightToLeft;
+bool result = fontEngine->stringToCMap(reinterpret_cast<const QChar *>(item->string + item->item.pos), item->item.length, glyphs, &nGlyphs, shaperFlags);
+item->num_glyphs = nGlyphs;
+glyphs->numGlyphs = nGlyphs;
+return result;
+}
+// shape all the items that intersect with the line, taking tab widths into account to find out what text actually fits in the line.
+void QTextEngine::shapeLine(const QScriptLine &line)
+{
+QFixed x;
+bool first = true;
+const int end = findItem(line.from + line.length - 1);
+int item = findItem(line.from);
+if (item == -1)
+return;
+for (item = findItem(line.from); item <= end; ++item) {
+QScriptItem &si = layoutData->items[item];
+if (si.analysis.flags == QScriptAnalysis::Tab) {
+ensureSpace(1);
+si.width = calculateTabWidth(item, x);
+} else {
+shape(item);
+}
+if (first && si.position != line.from) { // that means our x position has to be offset
+QGlyphLayout glyphs = shapedGlyphs(&si);
+Q_ASSERT(line.from > si.position);
+for (int i = line.from - si.position - 1; i >= 0; i--) {
+x -= glyphs.effectiveAdvance(i);
+}
+}
+first = false;
+x += si.width;
+}
+}
+extern int qt_defaultDpiY(); // in qfont.cpp
+void QTextEngine::shapeText(int item) const
+{
+Q_ASSERT(item < layoutData->items.size());
+QScriptItem &si = layoutData->items[item];
+if (si.num_glyphs)
+return;
+#if defined(Q_WS_MAC)
+shapeTextMac(item);
+#elif defined(Q_WS_WINCE)
+shapeTextWithCE(item);
+#else
+shapeTextWithHarfbuzz(item);
+#endif
+si.width = 0;
+if (!si.num_glyphs)
+return;
+QGlyphLayout glyphs = shapedGlyphs(&si);
+QFont font = this->font(si);
+bool letterSpacingIsAbsolute = font.d->letterSpacingIsAbsolute;
+QFixed letterSpacing = font.d->letterSpacing;
+QFixed wordSpacing = font.d->wordSpacing;
+if (letterSpacingIsAbsolute)
+letterSpacing *= font.d->dpi / qt_defaultDpiY();
+if (letterSpacing != 0) {
+for (int i = 1; i < si.num_glyphs; ++i) {
+if (glyphs.attributes[i].clusterStart) {
+if (letterSpacingIsAbsolute)
+glyphs.advances_x[i-1] += letterSpacing;
+else {
+const QFixed advance = glyphs.advances_x[i-1];
+glyphs.advances_x[i-1] += (letterSpacing - 100) * advance / 100;
+}
+}
+}
+if (letterSpacingIsAbsolute)
+glyphs.advances_x[si.num_glyphs-1] += letterSpacing;
+else {
+const QFixed advance = glyphs.advances_x[si.num_glyphs-1];
+glyphs.advances_x[si.num_glyphs-1] += (letterSpacing - 100) * advance / 100;
+}
+}
+if (wordSpacing != 0) {
+for (int i = 0; i < si.num_glyphs; ++i) {
+if (glyphs.attributes[i].justification == HB_Space
+|| glyphs.attributes[i].justification == HB_Arabic_Space) {
+// word spacing only gets added once to a consecutive run of spaces (see CSS spec)
+if (i + 1 == si.num_glyphs
+||(glyphs.attributes[i+1].justification != HB_Space
+&& glyphs.attributes[i+1].justification != HB_Arabic_Space))
+glyphs.advances_x[i] += wordSpacing;
+}
+}
+}
+for (int i = 0; i < si.num_glyphs; ++i)
+si.width += glyphs.advances_x[i];
+}
+#if defined(Q_WS_WINCE) //TODO
+// set the glyph attributes heuristically. Assumes a 1 to 1 relationship between chars and glyphs
+// and no reordering.
+// also computes logClusters heuristically
+static void heuristicSetGlyphAttributes(const QChar *uc, int length, QGlyphLayout *glyphs, unsigned short *logClusters, int num_glyphs)
+{
+// ### zeroWidth and justification are missing here!!!!!
+Q_UNUSED(num_glyphs);
+Q_ASSERT(num_glyphs <= length);
+//     qDebug("QScriptEngine::heuristicSetGlyphAttributes, num_glyphs=%d", item->num_glyphs);
+int glyph_pos = 0;
+for (int i = 0; i < length; i++) {
+if (uc[i].unicode() >= 0xd800 && uc[i].unicode() < 0xdc00 && i < length-1
+&& uc[i+1].unicode() >= 0xdc00 && uc[i+1].unicode() < 0xe000) {
+logClusters[i] = glyph_pos;
+logClusters[++i] = glyph_pos;
+} else {
+logClusters[i] = glyph_pos;
+}
+++glyph_pos;
+}
+// first char in a run is never (treated as) a mark
+int cStart = 0;
+const bool symbolFont = false; // ####
+glyphs->attributes[0].mark = false;
+glyphs->attributes[0].clusterStart = true;
+glyphs->attributes[0].dontPrint = (!symbolFont && uc[0].unicode() == 0x00ad) || qIsControlChar(uc[0].unicode());
+int pos = 0;
+int lastCat = QChar::category(uc[0].unicode());
+for (int i = 1; i < length; ++i) {
+if (logClusters[i] == pos)
+// same glyph
+continue;
+++pos;
+while (pos < logClusters[i]) {
+glyphs[pos].attributes = glyphs[pos-1].attributes;
+++pos;
+}
+// hide soft-hyphens by default
+if ((!symbolFont && uc[i].unicode() == 0x00ad) || qIsControlChar(uc[i].unicode()))
+glyphs->attributes[pos].dontPrint = true;
+const QUnicodeTables::Properties *prop = QUnicodeTables::properties(uc[i].unicode());
+int cat = prop->category;
+if (cat != QChar::Mark_NonSpacing) {
+glyphs->attributes[pos].mark = false;
+glyphs->attributes[pos].clusterStart = true;
+glyphs->attributes[pos].combiningClass = 0;
+cStart = logClusters[i];
+} else {
+int cmb = prop->combiningClass;
+if (cmb == 0) {
+// Fix 0 combining classes
+if ((uc[pos].unicode() & 0xff00) == 0x0e00) {
+// thai or lao
+unsigned char col = uc[pos].cell();
+if (col == 0x31 ||
+col == 0x34 ||
+col == 0x35 ||
+col == 0x36 ||
+col == 0x37 ||
+col == 0x47 ||
+col == 0x4c ||
+col == 0x4d ||
+col == 0x4e) {
+cmb = QChar::Combining_AboveRight;
+} else if (col == 0xb1 ||
+col == 0xb4 ||
+col == 0xb5 ||
+col == 0xb6 ||
+col == 0xb7 ||
+col == 0xbb ||
+col == 0xcc ||
+col == 0xcd) {
+cmb = QChar::Combining_Above;
+} else if (col == 0xbc) {
+cmb = QChar::Combining_Below;
+}
+}
+}
+glyphs->attributes[pos].mark = true;
+glyphs->attributes[pos].clusterStart = false;
+glyphs->attributes[pos].combiningClass = cmb;
+logClusters[i] = cStart;
+glyphs->advances_x[pos] = 0;
+glyphs->advances_y[pos] = 0;
+}
+// one gets an inter character justification point if the current char is not a non spacing mark.
+// as then the current char belongs to the last one and one gets a space justification point
+// after the space char.
+if (lastCat == QChar::Separator_Space)
+glyphs->attributes[pos-1].justification = HB_Space;
+else if (cat != QChar::Mark_NonSpacing)
+glyphs->attributes[pos-1].justification = HB_Character;
+else
+glyphs->attributes[pos-1].justification = HB_NoJustification;
+lastCat = cat;
+}
+pos = logClusters[length-1];
+if (lastCat == QChar::Separator_Space)
+glyphs->attributes[pos].justification = HB_Space;
+else
+glyphs->attributes[pos].justification = HB_Character;
+}
+void QTextEngine::shapeTextWithCE(int item) const
+{
+QScriptItem &si = layoutData->items[item];
+si.glyph_data_offset = layoutData->used;
+QFontEngine *fe = fontEngine(si, &si.ascent, &si.descent);
+QTextEngine::ShaperFlags flags;
+if (si.analysis.bidiLevel % 2)
+flags |= RightToLeft;
+if (option.useDesignMetrics())
+	flags |= DesignMetrics;
+attributes(); // pre-initialize char attributes
+const int len = length(item);
+int num_glyphs = length(item);
+const QChar *str = layoutData->string.unicode() + si.position;
+ushort upperCased[256];
+if (si.analysis.flags == QScriptAnalysis::SmallCaps || si.analysis.flags == QScriptAnalysis::Uppercase
+|| si.analysis.flags == QScriptAnalysis::Lowercase) {
+ushort *uc = upperCased;
+if (len > 256)
+uc = new ushort[len];
+for (int i = 0; i < len; ++i) {
+if(si.analysis.flags == QScriptAnalysis::Lowercase)
+uc[i] = str[i].toLower().unicode();
+else
+uc[i] = str[i].toUpper().unicode();
+}
+str = reinterpret_cast<const QChar *>(uc);
+}
+while (true) {
+ensureSpace(num_glyphs);
+num_glyphs = layoutData->glyphLayout.numGlyphs - layoutData->used;
+QGlyphLayout g = availableGlyphs(&si);
+unsigned short *log_clusters = logClusters(&si);
+if (fe->stringToCMap(str,
+len,
+&g,
+&num_glyphs,
+flags)) {
+heuristicSetGlyphAttributes(str, len, &g, log_clusters, num_glyphs);
+		    break;
+}
+}
+si.num_glyphs = num_glyphs;
+layoutData->used += si.num_glyphs;
+const ushort *uc = reinterpret_cast<const ushort *>(str);
+if ((si.analysis.flags == QScriptAnalysis::SmallCaps || si.analysis.flags == QScriptAnalysis::Uppercase
+|| si.analysis.flags == QScriptAnalysis::Lowercase)
+&& uc != upperCased)
+delete [] uc;
+}
+#endif
+static inline void moveGlyphData(const QGlyphLayout &destination, const QGlyphLayout &source, int num)
+{
+if (num > 0 && destination.glyphs != source.glyphs) {
+memmove(destination.glyphs, source.glyphs, num * sizeof(HB_Glyph));
+memmove(destination.attributes, source.attributes, num * sizeof(HB_GlyphAttributes));
+memmove(destination.advances_x, source.advances_x, num * sizeof(HB_Fixed));
+memmove(destination.offsets, source.offsets, num * sizeof(HB_FixedPoint));
+}
+}
+/// take the item from layoutData->items and
+void QTextEngine::shapeTextWithHarfbuzz(int item) const
+{
+Q_ASSERT(sizeof(HB_Fixed) == sizeof(QFixed));
+Q_ASSERT(sizeof(HB_FixedPoint) == sizeof(QFixedPoint));
+QScriptItem &si = layoutData->items[item];
+si.glyph_data_offset = layoutData->used;
+QFontEngine *font = fontEngine(si, &si.ascent, &si.descent);
+bool kerningEnabled = this->font(si).d->kerning;
+HB_ShaperItem entire_shaper_item;
+entire_shaper_item.kerning_applied = false;
+entire_shaper_item.string = reinterpret_cast<const HB_UChar16 *>(layoutData->string.constData());
+entire_shaper_item.stringLength = layoutData->string.length();
+entire_shaper_item.item.script = (HB_Script)si.analysis.script;
+entire_shaper_item.item.pos = si.position;
+entire_shaper_item.item.length = length(item);
+entire_shaper_item.item.bidiLevel = si.analysis.bidiLevel;
+entire_shaper_item.glyphIndicesPresent = false;
+HB_UChar16 upperCased[256]; // XXX what about making this 4096, so we don't have to extend it ever.
+if (si.analysis.flags == QScriptAnalysis::SmallCaps || si.analysis.flags == QScriptAnalysis::Uppercase
+|| si.analysis.flags == QScriptAnalysis::Lowercase) {
+HB_UChar16 *uc = upperCased;
+if (entire_shaper_item.item.length > 256)
+uc = new HB_UChar16[entire_shaper_item.item.length];
+for (uint i = 0; i < entire_shaper_item.item.length; ++i) {
+if(si.analysis.flags == QScriptAnalysis::Lowercase)
+uc[i] = QChar::toLower(entire_shaper_item.string[si.position + i]);
+else
+uc[i] = QChar::toUpper(entire_shaper_item.string[si.position + i]);
+}
+entire_shaper_item.item.pos = 0;
+entire_shaper_item.string = uc;
+entire_shaper_item.stringLength = entire_shaper_item.item.length;
+}
+entire_shaper_item.shaperFlags = 0;
+if (!kerningEnabled)
+entire_shaper_item.shaperFlags |= HB_ShaperFlag_NoKerning;
+if (option.useDesignMetrics())
+entire_shaper_item.shaperFlags |= HB_ShaperFlag_UseDesignMetrics;
+entire_shaper_item.num_glyphs = qMax(layoutData->glyphLayout.numGlyphs - layoutData->used, int(entire_shaper_item.item.length));
+ensureSpace(entire_shaper_item.num_glyphs);
+QGlyphLayout initialGlyphs = availableGlyphs(&si).mid(0, entire_shaper_item.num_glyphs);
+if (!stringToGlyphs(&entire_shaper_item, &initialGlyphs, font)) {
+ensureSpace(entire_shaper_item.num_glyphs);
+initialGlyphs = availableGlyphs(&si).mid(0, entire_shaper_item.num_glyphs);
+if (!stringToGlyphs(&entire_shaper_item, &initialGlyphs, font)) {
+// ############ if this happens there's a bug in the fontengine
+if ((si.analysis.flags == QScriptAnalysis::SmallCaps || si.analysis.flags == QScriptAnalysis::Uppercase
+|| si.analysis.flags == QScriptAnalysis::Lowercase) && entire_shaper_item.string != upperCased)
+delete [] const_cast<HB_UChar16 *>(entire_shaper_item.string);
+return;
+}
+}
+// split up the item into parts that come from different font engines.
+QVarLengthArray<int> itemBoundaries(2);
+// k * 2 entries, array[k] == index in string, array[k + 1] == index in glyphs
+itemBoundaries[0] = entire_shaper_item.item.pos;
+itemBoundaries[1] = 0;
+if (font->type() == QFontEngine::Multi) {
+uint lastEngine = 0;
+int charIdx = entire_shaper_item.item.pos;
+const int stringEnd = charIdx + entire_shaper_item.item.length;
+for (quint32 i = 0; i < entire_shaper_item.num_glyphs; ++i, ++charIdx) {
+uint engineIdx = initialGlyphs.glyphs[i] >> 24;
+if (engineIdx != lastEngine && i > 0) {
+itemBoundaries.append(charIdx);
+itemBoundaries.append(i);
+}
+lastEngine = engineIdx;
+if (HB_IsHighSurrogate(entire_shaper_item.string[charIdx])
+&& charIdx < stringEnd - 1
+&& HB_IsLowSurrogate(entire_shaper_item.string[charIdx + 1]))
+++charIdx;
+}
+}
+int remaining_glyphs = entire_shaper_item.num_glyphs;
+int glyph_pos = 0;
+// for each item shape using harfbuzz and store the results in our layoutData's glyphs array.
+for (int k = 0; k < itemBoundaries.size(); k += 2) { // for the +2, see the comment at the definition of itemBoundaries
+HB_ShaperItem shaper_item = entire_shaper_item;
+shaper_item.item.pos = itemBoundaries[k];
+if (k < itemBoundaries.size() - 3) {
+shaper_item.item.length = itemBoundaries[k + 2] - shaper_item.item.pos;
+shaper_item.num_glyphs = itemBoundaries[k + 3] - itemBoundaries[k + 1];
+} else { // last combo in the list, avoid out of bounds access.
+shaper_item.item.length -= shaper_item.item.pos - entire_shaper_item.item.pos;
+shaper_item.num_glyphs -= itemBoundaries[k + 1];
+}
+shaper_item.initialGlyphCount = shaper_item.num_glyphs;
+QFontEngine *actualFontEngine = font;
+uint engineIdx = 0;
+if (font->type() == QFontEngine::Multi) {
+engineIdx = uint(availableGlyphs(&si).glyphs[glyph_pos] >> 24);
+actualFontEngine = static_cast<QFontEngineMulti *>(font)->engine(engineIdx);
+}
+shaper_item.font = actualFontEngine->harfbuzzFont();
+shaper_item.face = actualFontEngine->harfbuzzFace();
+shaper_item.glyphIndicesPresent = true;
+remaining_glyphs -= shaper_item.initialGlyphCount;
+do {
+ensureSpace(glyph_pos + shaper_item.num_glyphs + remaining_glyphs);
+const QGlyphLayout g = availableGlyphs(&si).mid(glyph_pos);
+moveGlyphData(g.mid(shaper_item.num_glyphs), g.mid(shaper_item.initialGlyphCount), remaining_glyphs);
+shaper_item.glyphs = g.glyphs;
+shaper_item.attributes = g.attributes;
+shaper_item.advances = reinterpret_cast<HB_Fixed *>(g.advances_x);
+shaper_item.offsets = reinterpret_cast<HB_FixedPoint *>(g.offsets);
+if (shaper_item.glyphIndicesPresent) {
+for (hb_uint32 i = 0; i < shaper_item.initialGlyphCount; ++i)
+shaper_item.glyphs[i] &= 0x00ffffff;
+}
+shaper_item.log_clusters = logClusters(&si) + shaper_item.item.pos - entire_shaper_item.item.pos;
+//          qDebug("    .. num_glyphs=%d, used=%d, item.num_glyphs=%d", num_glyphs, used, shaper_item.num_glyphs);
+} while (!qShapeItem(&shaper_item)); // this does the actual shaping via harfbuzz.
+QGlyphLayout g = availableGlyphs(&si).mid(glyph_pos, shaper_item.num_glyphs);
+moveGlyphData(g.mid(shaper_item.num_glyphs), g.mid(shaper_item.initialGlyphCount), remaining_glyphs);
+for (hb_uint32 i = 0; i < shaper_item.num_glyphs; ++i)
+g.glyphs[i] = g.glyphs[i] | (engineIdx << 24);
+for (hb_uint32 i = 0; i < shaper_item.item.length; ++i)
+shaper_item.log_clusters[i] += glyph_pos;
+if (kerningEnabled && !shaper_item.kerning_applied)
+font->doKerning(&g, option.useDesignMetrics() ? QFlag(QTextEngine::DesignMetrics) : QFlag(0));
+glyph_pos += shaper_item.num_glyphs;
+}
+//     qDebug("    -> item: script=%d num_glyphs=%d", shaper_item.script, shaper_item.num_glyphs);
+si.num_glyphs = glyph_pos;
+layoutData->used += si.num_glyphs;
+if ((si.analysis.flags == QScriptAnalysis::SmallCaps || si.analysis.flags == QScriptAnalysis::Uppercase)
+&& entire_shaper_item.string != upperCased)
+delete [] const_cast<HB_UChar16 *>(entire_shaper_item.string);
+}
+static void init(QTextEngine *e)
+{
+e->ignoreBidi = false;
+e->cacheGlyphs = false;
+e->forceJustification = false;
+e->layoutData = 0;
+e->minWidth = 0;
+e->maxWidth = 0;
+e->underlinePositions = 0;
+e->specialData = 0;
+e->stackEngine = false;
+}
+QTextEngine::QTextEngine()
+{
+init(this);
+}
+QTextEngine::QTextEngine(const QString &str, const QFont &f)
+: fnt(f)
+{
+init(this);
+text = str;
+}
+QTextEngine::~QTextEngine()
+{
+if (!stackEngine)
+delete layoutData;
+delete specialData;
+}
+const HB_CharAttributes *QTextEngine::attributes() const
+{
+if (layoutData && layoutData->haveCharAttributes)
+return (HB_CharAttributes *) layoutData->memory;
+itemize();
+ensureSpace(layoutData->string.length());
+QVarLengthArray<HB_ScriptItem> hbScriptItems(layoutData->items.size());
+for (int i = 0; i < layoutData->items.size(); ++i) {
+const QScriptItem &si = layoutData->items[i];
+hbScriptItems[i].pos = si.position;
+hbScriptItems[i].length = length(i);
+hbScriptItems[i].bidiLevel = si.analysis.bidiLevel;
+hbScriptItems[i].script = (HB_Script)si.analysis.script;
+}
+qGetCharAttributes(reinterpret_cast<const HB_UChar16 *>(layoutData->string.constData()),
+layoutData->string.length(),
+hbScriptItems.data(), hbScriptItems.size(),
+(HB_CharAttributes *)layoutData->memory);
+layoutData->haveCharAttributes = true;
+return (HB_CharAttributes *) layoutData->memory;
+}
+void QTextEngine::shape(int item) const
+{
+if (layoutData->items[item].analysis.flags == QScriptAnalysis::Object) {
+ensureSpace(1);
+if (block.docHandle()) {
+QTextFormat format = formats()->format(formatIndex(&layoutData->items[item]));
+docLayout()->resizeInlineObject(QTextInlineObject(item, const_cast<QTextEngine *>(this)),
+layoutData->items[item].position + block.position(), format);
+}
+} else if (layoutData->items[item].analysis.flags == QScriptAnalysis::Tab) {
+// set up at least the ascent/descent of the script item for the tab
+fontEngine(layoutData->items[item], &layoutData->items[item].ascent, &layoutData->items[item].descent);
+} else {
+shapeText(item);
+}
+}
+void QTextEngine::invalidate()
+{
+freeMemory();
+minWidth = 0;
+maxWidth = 0;
+if (specialData)
+specialData->resolvedFormatIndices.clear();
+}
+void QTextEngine::clearLineData()
+{
+lines.clear();
+}
+void QTextEngine::validate() const
+{
+if (layoutData)
+return;
+layoutData = new LayoutData();
+if (block.docHandle()) {
+layoutData->string = block.text();
+if (option.flags() & QTextOption::ShowLineAndParagraphSeparators)
+layoutData->string += QLatin1Char(block.next().isValid() ? 0xb6 : 0x20);
+} else {
+layoutData->string = text;
+}
+if (specialData && specialData->preeditPosition != -1)
+layoutData->string.insert(specialData->preeditPosition, specialData->preeditText);
+}
+void QTextEngine::itemize() const
+{
+validate();
+if (layoutData->items.size())
+return;
+int length = layoutData->string.length();
+if (!length)
+return;
+#if defined(Q_WS_MAC) && !defined(QT_MAC_USE_COCOA)
+// ATSUI requires RTL flags to correctly identify the character stops.
+bool ignore = false;
+#else
+bool ignore = ignoreBidi;
+#endif
+if (!ignore && option.textDirection() == Qt::LeftToRight) {
+ignore = true;
+const QChar *start = layoutData->string.unicode();
+const QChar * const end = start + length;
+while (start < end) {
+if (start->unicode() >= 0x590) {
+ignore = false;
+break;
+}
+++start;
+}
+}
+QVarLengthArray<QScriptAnalysis, 4096> scriptAnalysis(length);
+QScriptAnalysis *analysis = scriptAnalysis.data();
+QBidiControl control(option.textDirection() == Qt::RightToLeft);
+if (ignore) {
+memset(analysis, 0, length*sizeof(QScriptAnalysis));
+if (option.textDirection() == Qt::RightToLeft) {
+for (int i = 0; i < length; ++i)
+analysis[i].bidiLevel = 1;
+layoutData->hasBidi = true;
+}
+} else {
+layoutData->hasBidi = bidiItemize(const_cast<QTextEngine *>(this), analysis, control);
+}
+const ushort *unicode = layoutData->string.utf16();
+// correctly assign script, isTab and isObject to the script analysis
+const ushort *uc = unicode;
+const ushort *e = uc + length;
+int lastScript = QUnicodeTables::Common;
+while (uc < e) {
+int script = QUnicodeTables::script(*uc);
+if (script == QUnicodeTables::Inherited)
+script = lastScript;
+analysis->flags = QScriptAnalysis::None;
+if (*uc == QChar::ObjectReplacementCharacter) {
+if (analysis->bidiLevel % 2)
+--analysis->bidiLevel;
+analysis->script = QUnicodeTables::Common;
+analysis->flags = QScriptAnalysis::Object;
+} else if (*uc == QChar::LineSeparator) {
+if (analysis->bidiLevel % 2)
+--analysis->bidiLevel;
+analysis->script = QUnicodeTables::Common;
+analysis->flags = QScriptAnalysis::LineOrParagraphSeparator;
+if (option.flags() & QTextOption::ShowLineAndParagraphSeparators)
+*const_cast<ushort*>(uc) = 0x21B5; // visual line separator
+} else if (*uc == 9) {
+analysis->script = QUnicodeTables::Common;
+analysis->flags = QScriptAnalysis::Tab;
+analysis->bidiLevel = control.baseLevel();
+} else if ((*uc == 32 || *uc == QChar::Nbsp)
+&& (option.flags() & QTextOption::ShowTabsAndSpaces)) {
+analysis->script = QUnicodeTables::Common;
+analysis->flags = QScriptAnalysis::Space;
+analysis->bidiLevel = control.baseLevel();
+} else {
+analysis->script = script;
+}
+lastScript = analysis->script;
+++uc;
+++analysis;
+}
+if (option.flags() & QTextOption::ShowLineAndParagraphSeparators) {
+(analysis-1)->flags = QScriptAnalysis::LineOrParagraphSeparator; // to exclude it from width
+}
+Itemizer itemizer(layoutData->string, scriptAnalysis.data(), layoutData->items);
+const QTextDocumentPrivate *p = block.docHandle();
+if (p) {
+SpecialData *s = specialData;
+QTextDocumentPrivate::FragmentIterator it = p->find(block.position());
+QTextDocumentPrivate::FragmentIterator end = p->find(block.position() + block.length() - 1); // -1 to omit the block separator char
+int format = it.value()->format;
+int prevPosition = 0;
+int position = prevPosition;
+while (1) {
+const QTextFragmentData * const frag = it.value();
+if (it == end || format != frag->format) {
+if (s && position >= s->preeditPosition) {
+position += s->preeditText.length();
+s = 0;
+}
+Q_ASSERT(position <= length);
+itemizer.generate(prevPosition, position - prevPosition,
+formats()->charFormat(format).fontCapitalization());
+if (it == end) {
+if (position < length)
+itemizer.generate(position, length - position,
+formats()->charFormat(format).fontCapitalization());
+break;
+}
+format = frag->format;
+prevPosition = position;
+}
+position += frag->size_array[0];
+++it;
+}
+} else {
+itemizer.generate(0, length, static_cast<QFont::Capitalization> (fnt.d->capital));
+}
+addRequiredBoundaries();
+resolveAdditionalFormats();
+}
+int QTextEngine::findItem(int strPos) const
+{
+itemize();
+// ##### use binary search
+int item;
+for (item = layoutData->items.size()-1; item > 0; --item) {
+if (layoutData->items[item].position <= strPos)
+break;
+}
+return item;
+}
+QFixed QTextEngine::width(int from, int len) const
+{
+itemize();
+QFixed w = 0;
+//     qDebug("QTextEngine::width(from = %d, len = %d), numItems=%d, strleng=%d", from,  len, items.size(), string.length());
+for (int i = 0; i < layoutData->items.size(); i++) {
+const QScriptItem *si = layoutData->items.constData() + i;
+int pos = si->position;
+int ilen = length(i);
+//          qDebug("item %d: from %d len %d", i, pos, ilen);
+if (pos >= from + len)
+break;
+if (pos + ilen > from) {
+if (!si->num_glyphs)
+shape(i);
+if (si->analysis.flags == QScriptAnalysis::Object) {
+w += si->width;
+continue;
+} else if (si->analysis.flags == QScriptAnalysis::Tab) {
+w += calculateTabWidth(i, w);
+continue;
+}
+QGlyphLayout glyphs = shapedGlyphs(si);
+unsigned short *logClusters = this->logClusters(si);
+//             fprintf(stderr, "  logclusters:");
+//             for (int k = 0; k < ilen; k++)
+//                 fprintf(stderr, " %d", logClusters[k]);
+//             fprintf(stderr, "\n");
+// do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
+int charFrom = from - pos;
+if (charFrom < 0)
+charFrom = 0;
+int glyphStart = logClusters[charFrom];
+if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
+while (charFrom < ilen && logClusters[charFrom] == glyphStart)
+charFrom++;
+if (charFrom < ilen) {
+glyphStart = logClusters[charFrom];
+int charEnd = from + len - 1 - pos;
+if (charEnd >= ilen)
+charEnd = ilen-1;
+int glyphEnd = logClusters[charEnd];
+while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
+charEnd++;
+glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
+//                 qDebug("char: start=%d end=%d / glyph: start = %d, end = %d", charFrom, charEnd, glyphStart, glyphEnd);
+for (int i = glyphStart; i < glyphEnd; i++)
+w += glyphs.advances_x[i] * !glyphs.attributes[i].dontPrint;
+}
+}
+}
+//     qDebug("   --> w= %d ", w);
+return w;
+}
+glyph_metrics_t QTextEngine::boundingBox(int from,  int len) const
+{
+itemize();
+glyph_metrics_t gm;
+for (int i = 0; i < layoutData->items.size(); i++) {
+const QScriptItem *si = layoutData->items.constData() + i;
+QFontEngine *fe = fontEngine(*si);
+int pos = si->position;
+int ilen = length(i);
+if (pos > from + len)
+break;
+if (pos + ilen > from) {
+if (!si->num_glyphs)
+shape(i);
+if (si->analysis.flags == QScriptAnalysis::Object) {
+gm.width += si->width;
+continue;
+} else if (si->analysis.flags == QScriptAnalysis::Tab) {
+gm.width += calculateTabWidth(i, gm.width);
+continue;
+}
+unsigned short *logClusters = this->logClusters(si);
+QGlyphLayout glyphs = shapedGlyphs(si);
+// do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
+int charFrom = from - pos;
+if (charFrom < 0)
+charFrom = 0;
+int glyphStart = logClusters[charFrom];
+if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
+while (charFrom < ilen && logClusters[charFrom] == glyphStart)
+charFrom++;
+if (charFrom < ilen) {
+glyphStart = logClusters[charFrom];
+int charEnd = from + len - 1 - pos;
+if (charEnd >= ilen)
+charEnd = ilen-1;
+int glyphEnd = logClusters[charEnd];
+while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
+charEnd++;
+glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
+if (glyphStart <= glyphEnd ) {
+glyph_metrics_t m = fe->boundingBox(glyphs.mid(glyphStart, glyphEnd - glyphStart));
+gm.x = qMin(gm.x, m.x + gm.xoff);
+gm.y = qMin(gm.y, m.y + gm.yoff);
+gm.width = qMax(gm.width, m.width+gm.xoff);
+gm.height = qMax(gm.height, m.height+gm.yoff);
+gm.xoff += m.xoff;
+gm.yoff += m.yoff;
+}
+}
+glyph_t glyph = glyphs.glyphs[logClusters[pos + ilen - 1]];
+glyph_metrics_t gi = fe->boundingBox(glyph);
+if (gi.isValid())
+gm.width -= qRound(gi.xoff - gi.x - gi.width);
+}
+}
+return gm;
+}
+glyph_metrics_t QTextEngine::tightBoundingBox(int from,  int len) const
+{
+itemize();
+glyph_metrics_t gm;
+for (int i = 0; i < layoutData->items.size(); i++) {
+const QScriptItem *si = layoutData->items.constData() + i;
+int pos = si->position;
+int ilen = length(i);
+if (pos > from + len)
+break;
+if (pos + len > from) {
+if (!si->num_glyphs)
+shape(i);
+unsigned short *logClusters = this->logClusters(si);
+QGlyphLayout glyphs = shapedGlyphs(si);
+// do the simple thing for now and give the first glyph in a cluster the full width, all other ones 0.
+int charFrom = from - pos;
+if (charFrom < 0)
+charFrom = 0;
+int glyphStart = logClusters[charFrom];
+if (charFrom > 0 && logClusters[charFrom-1] == glyphStart)
+while (charFrom < ilen && logClusters[charFrom] == glyphStart)
+charFrom++;
+if (charFrom < ilen) {
+glyphStart = logClusters[charFrom];
+int charEnd = from + len - 1 - pos;
+if (charEnd >= ilen)
+charEnd = ilen-1;
+int glyphEnd = logClusters[charEnd];
+while (charEnd < ilen && logClusters[charEnd] == glyphEnd)
+charEnd++;
+glyphEnd = (charEnd == ilen) ? si->num_glyphs : logClusters[charEnd];
+if (glyphStart <= glyphEnd ) {
+QFontEngine *fe = fontEngine(*si);
+glyph_metrics_t m = fe->tightBoundingBox(glyphs.mid(glyphStart, glyphEnd - glyphStart));
+gm.x = qMin(gm.x, m.x + gm.xoff);
+gm.y = qMin(gm.y, m.y + gm.yoff);
+gm.width = qMax(gm.width, m.width+gm.xoff);
+gm.height = qMax(gm.height, m.height+gm.yoff);
+gm.xoff += m.xoff;
+gm.yoff += m.yoff;
+}
+}
+}
+}
+return gm;
+}
+QFont QTextEngine::font(const QScriptItem &si) const
+{
+QFont font = fnt;
+if (hasFormats()) {
+QTextCharFormat f = format(&si);
+font = f.font();
+if (block.docHandle() && block.docHandle()->layout()) {
+// Make sure we get the right dpi on printers
+QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
+if (pdev)
+font = QFont(font, pdev);
+} else {
+font = font.resolve(fnt);
+}
+QTextCharFormat::VerticalAlignment valign = f.verticalAlignment();
+if (valign == QTextCharFormat::AlignSuperScript || valign == QTextCharFormat::AlignSubScript) {
+if (font.pointSize() != -1)
+font.setPointSize((font.pointSize() * 2) / 3);
+else
+font.setPixelSize((font.pixelSize() * 2) / 3);
+}
+}
+if (si.analysis.flags == QScriptAnalysis::SmallCaps)
+font = font.d->smallCapsFont();
+return font;
+}
+QFontEngine *QTextEngine::fontEngine(const QScriptItem &si, QFixed *ascent, QFixed *descent) const
+{
+QFontEngine *engine = 0;
+QFontEngine *scaledEngine = 0;
+int script = si.analysis.script;
+QFont font = fnt;
+if (hasFormats()) {
+QTextCharFormat f = format(&si);
+font = f.font();
+if (block.docHandle() && block.docHandle()->layout()) {
+// Make sure we get the right dpi on printers
+QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
+if (pdev)
+font = QFont(font, pdev);
+} else {
+font = font.resolve(fnt);
+}
+engine = font.d->engineForScript(script);
+QTextCharFormat::VerticalAlignment valign = f.verticalAlignment();
+if (valign == QTextCharFormat::AlignSuperScript || valign == QTextCharFormat::AlignSubScript) {
+if (font.pointSize() != -1)
+font.setPointSize((font.pointSize() * 2) / 3);
+else
+font.setPixelSize((font.pixelSize() * 2) / 3);
+scaledEngine = font.d->engineForScript(script);
+}
+} else {
+engine = font.d->engineForScript(script);
+}
+if (si.analysis.flags == QScriptAnalysis::SmallCaps) {
+QFontPrivate *p = font.d->smallCapsFontPrivate();
+scaledEngine = p->engineForScript(script);
+}
+if (ascent) {
+*ascent = engine->ascent();
+*descent = engine->descent();
+}
+if (scaledEngine)
+return scaledEngine;
+return engine;
+}
+struct QJustificationPoint {
+int type;
+QFixed kashidaWidth;
+QGlyphLayout glyph;
+QFontEngine *fontEngine;
+};
+Q_DECLARE_TYPEINFO(QJustificationPoint, Q_PRIMITIVE_TYPE);
+static void set(QJustificationPoint *point, int type, const QGlyphLayout &glyph, QFontEngine *fe)
+{
+point->type = type;
+point->glyph = glyph;
+point->fontEngine = fe;
+if (type >= HB_Arabic_Normal) {
+QChar ch(0x640); // Kashida character
+QGlyphLayoutArray<8> glyphs;
+int nglyphs = 7;
+fe->stringToCMap(&ch, 1, &glyphs, &nglyphs, 0);
+if (glyphs.glyphs[0] && glyphs.advances_x[0] != 0) {
+point->kashidaWidth = glyphs.advances_x[0];
+} else {
+point->type = HB_NoJustification;
+point->kashidaWidth = 0;
+}
+}
+}
+void QTextEngine::justify(const QScriptLine &line)
+{
+//     qDebug("justify: line.gridfitted = %d, line.justified=%d", line.gridfitted, line.justified);
+if (line.gridfitted && line.justified)
+return;
+if (!line.gridfitted) {
+// redo layout in device metrics, then adjust
+const_cast<QScriptLine &>(line).gridfitted = true;
+}
+if ((option.alignment() & Qt::AlignHorizontal_Mask) != Qt::AlignJustify)
+return;
+itemize();
+if (!forceJustification) {
+int end = line.from + (int)line.length;
+if (end == layoutData->string.length())
+return; // no justification at end of paragraph
+if (end && layoutData->items[findItem(end-1)].analysis.flags == QScriptAnalysis::LineOrParagraphSeparator)
+return; // no justification at the end of an explicitely separated line
+}
+// justify line
+int maxJustify = 0;
+// don't include trailing white spaces when doing justification
+int line_length = line.length;
+const HB_CharAttributes *a = attributes()+line.from;
+while (line_length && a[line_length-1].whiteSpace)
+--line_length;
+// subtract one char more, as we can't justfy after the last character
+--line_length;
+if (!line_length)
+return;
+int firstItem = findItem(line.from);
+int nItems = findItem(line.from + line_length - 1) - firstItem + 1;
+QVarLengthArray<QJustificationPoint> justificationPoints;
+int nPoints = 0;
+//     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());
+QFixed minKashida = 0x100000;
+// we need to do all shaping before we go into the next loop, as we there
+// store pointers to the glyph data that could get reallocated by the shaping
+// process.
+for (int i = 0; i < nItems; ++i) {
+QScriptItem &si = layoutData->items[firstItem + i];
+if (!si.num_glyphs)
+shape(firstItem + i);
+}
+for (int i = 0; i < nItems; ++i) {
+QScriptItem &si = layoutData->items[firstItem + i];
+int kashida_type = HB_Arabic_Normal;
+int kashida_pos = -1;
+int start = qMax(line.from - si.position, 0);
+int end = qMin(line.from + line_length - (int)si.position, length(firstItem+i));
+unsigned short *log_clusters = logClusters(&si);
+int gs = log_clusters[start];
+int ge = (end == length(firstItem+i) ? si.num_glyphs : log_clusters[end]);
+const QGlyphLayout g = shapedGlyphs(&si);
+for (int i = gs; i < ge; ++i) {
+g.justifications[i].type = QGlyphJustification::JustifyNone;
+g.justifications[i].nKashidas = 0;
+g.justifications[i].space_18d6 = 0;
+justificationPoints.resize(nPoints+3);
+int justification = g.attributes[i].justification;
+switch(justification) {
+case HB_NoJustification:
+break;
+case HB_Space          :
+// fall through
+case HB_Arabic_Space   :
+if (kashida_pos >= 0) {
+//                     qDebug("kashida position at %d in word", kashida_pos);
+set(&justificationPoints[nPoints], kashida_type, g.mid(kashida_pos), fontEngine(si));
+minKashida = qMin(minKashida, justificationPoints[nPoints].kashidaWidth);
+maxJustify = qMax(maxJustify, justificationPoints[nPoints].type);
+++nPoints;
+}
+kashida_pos = -1;
+kashida_type = HB_Arabic_Normal;
+// fall through
+case HB_Character      :
+set(&justificationPoints[nPoints++], justification, g.mid(i), fontEngine(si));
+maxJustify = qMax(maxJustify, justification);
+break;
+case HB_Arabic_Normal  :
+case HB_Arabic_Waw     :
+case HB_Arabic_BaRa    :
+case HB_Arabic_Alef    :
+case HB_Arabic_HaaDal  :
+case HB_Arabic_Seen    :
+case HB_Arabic_Kashida :
+if (justification >= kashida_type) {
+kashida_pos = i;
+kashida_type = justification;
+}
+}
+}
+if (kashida_pos >= 0) {
+set(&justificationPoints[nPoints], kashida_type, g.mid(kashida_pos), fontEngine(si));
+minKashida = qMin(minKashida, justificationPoints[nPoints].kashidaWidth);
+maxJustify = qMax(maxJustify, justificationPoints[nPoints].type);
+++nPoints;
+}
+}
+QFixed need = line.width - line.textWidth;
+if (need < 0) {
+// line overflows already!
+const_cast<QScriptLine &>(line).justified = true;
+return;
+}
+//     qDebug("doing justification: textWidth=%x, requested=%x, maxJustify=%d", line.textWidth.value(), line.width.value(), maxJustify);
+//     qDebug("     minKashida=%f, need=%f", minKashida.toReal(), need.toReal());
+// distribute in priority order
+if (maxJustify >= HB_Arabic_Normal) {
+while (need >= minKashida) {
+for (int type = maxJustify; need >= minKashida && type >= HB_Arabic_Normal; --type) {
+for (int i = 0; need >= minKashida && i < nPoints; ++i) {
+if (justificationPoints[i].type == type && justificationPoints[i].kashidaWidth <= need) {
+justificationPoints[i].glyph.justifications->nKashidas++;
+// ############
+justificationPoints[i].glyph.justifications->space_18d6 += justificationPoints[i].kashidaWidth.value();
+need -= justificationPoints[i].kashidaWidth;
+//                         qDebug("adding kashida type %d with width %x, neednow %x", type, justificationPoints[i].kashidaWidth, need.value());
+}
+}
+}
+}
+}
+Q_ASSERT(need >= 0);
+if (!need)
+goto end;
+maxJustify = qMin(maxJustify, (int)HB_Space);
+for (int type = maxJustify; need != 0 && type > 0; --type) {
+int n = 0;
+for (int i = 0; i < nPoints; ++i) {
+if (justificationPoints[i].type == type)
+++n;
+}
+//          qDebug("number of points for justification type %d: %d", type, n);
+if (!n)
+continue;
+for (int i = 0; i < nPoints; ++i) {
+if (justificationPoints[i].type == type) {
+QFixed add = need/n;
+//                  qDebug("adding %x to glyph %x", add.value(), justificationPoints[i].glyph->glyph);
+justificationPoints[i].glyph.justifications[0].space_18d6 = add.value();
+need -= add;
+--n;
+}
+}
+Q_ASSERT(!need);
+}
+end:
+const_cast<QScriptLine &>(line).justified = true;
+}
+void QScriptLine::setDefaultHeight(QTextEngine *eng)
+{
+QFont f;
+QFontEngine *e;
+if (eng->block.docHandle() && eng->block.docHandle()->layout()) {
+f = eng->block.charFormat().font();
+// Make sure we get the right dpi on printers
+QPaintDevice *pdev = eng->block.docHandle()->layout()->paintDevice();
+if (pdev)
+f = QFont(f, pdev);
+e = f.d->engineForScript(QUnicodeTables::Common);
+} else {
+e = eng->fnt.d->engineForScript(QUnicodeTables::Common);
+}
+ascent = qMax(ascent, e->ascent());
+descent = qMax(descent, e->descent());
+}
+QTextEngine::LayoutData::LayoutData()
+{
+memory = 0;
+allocated = 0;
+memory_on_stack = false;
+used = 0;
+hasBidi = false;
+inLayout = false;
+haveCharAttributes = false;
+logClustersPtr = 0;
+available_glyphs = 0;
+}
+QTextEngine::LayoutData::LayoutData(const QString &str, void **stack_memory, int _allocated)
+: string(str)
+{
+allocated = _allocated;
+int space_charAttributes = sizeof(HB_CharAttributes)*string.length()/sizeof(void*) + 1;
+int space_logClusters = sizeof(unsigned short)*string.length()/sizeof(void*) + 1;
+available_glyphs = ((int)allocated - space_charAttributes - space_logClusters)*(int)sizeof(void*)/(int)QGlyphLayout::spaceNeededForGlyphLayout(1);
+if (available_glyphs < str.length()) {
+// need to allocate on the heap
+allocated = 0;
+memory_on_stack = false;
+memory = 0;
+logClustersPtr = 0;
+} else {
+memory_on_stack = true;
+memory = stack_memory;
+logClustersPtr = (unsigned short *)(memory + space_charAttributes);
+void *m = memory + space_charAttributes + space_logClusters;
+glyphLayout = QGlyphLayout(reinterpret_cast<char *>(m), str.length());
+glyphLayout.clear();
+memset(memory, 0, space_charAttributes*sizeof(void *));
+}
+used = 0;
+hasBidi = false;
+inLayout = false;
+haveCharAttributes = false;
+}
+QTextEngine::LayoutData::~LayoutData()
+{
+if (!memory_on_stack)
+free(memory);
+memory = 0;
+}
+void QTextEngine::LayoutData::reallocate(int totalGlyphs)
+{
+Q_ASSERT(totalGlyphs >= glyphLayout.numGlyphs);
+if (memory_on_stack && available_glyphs >= totalGlyphs) {
+glyphLayout.grow(glyphLayout.data(), totalGlyphs);
+return;
+}
+int space_charAttributes = sizeof(HB_CharAttributes)*string.length()/sizeof(void*) + 1;
+int space_logClusters = sizeof(unsigned short)*string.length()/sizeof(void*) + 1;
+int space_glyphs = QGlyphLayout::spaceNeededForGlyphLayout(totalGlyphs)/sizeof(void*) + 2;
+int newAllocated = space_charAttributes + space_glyphs + space_logClusters;
+Q_ASSERT(newAllocated >= allocated);
+void **newMem = memory;
+newMem = (void **)::realloc(memory_on_stack ? 0 : memory, newAllocated*sizeof(void *));
+Q_CHECK_PTR(newMem);
+if (memory_on_stack && newMem)
+memcpy(newMem, memory, allocated*sizeof(void *));
+memory = newMem;
+memory_on_stack = false;
+void **m = memory;
+m += space_charAttributes;
+logClustersPtr = (unsigned short *) m;
+m += space_logClusters;
+const int space_preGlyphLayout = space_charAttributes + space_logClusters;
+if (allocated < space_preGlyphLayout)
+memset(memory + allocated, 0, (space_preGlyphLayout - allocated)*sizeof(void *));
+glyphLayout.grow(reinterpret_cast<char *>(m), totalGlyphs);
+allocated = newAllocated;
+}
+// grow to the new size, copying the existing data to the new layout
+void QGlyphLayout::grow(char *address, int totalGlyphs)
+{
+QGlyphLayout oldLayout(address, numGlyphs);
+QGlyphLayout newLayout(address, totalGlyphs);
+if (numGlyphs) {
+// move the existing data
+memmove(newLayout.attributes, oldLayout.attributes, numGlyphs * sizeof(HB_GlyphAttributes));
+memmove(newLayout.justifications, oldLayout.justifications, numGlyphs * sizeof(QGlyphJustification));
+memmove(newLayout.advances_y, oldLayout.advances_y, numGlyphs * sizeof(QFixed));
+memmove(newLayout.advances_x, oldLayout.advances_x, numGlyphs * sizeof(QFixed));
+memmove(newLayout.glyphs, oldLayout.glyphs, numGlyphs * sizeof(HB_Glyph));
+}
+// clear the new data
+newLayout.clear(numGlyphs);
+*this = newLayout;
+}
+void QTextEngine::freeMemory()
+{
+if (!stackEngine) {
+delete layoutData;
+layoutData = 0;
+} else {
+layoutData->used = 0;
+layoutData->hasBidi = false;
+layoutData->inLayout = false;
+layoutData->haveCharAttributes = false;
+}
+for (int i = 0; i < lines.size(); ++i) {
+lines[i].justified = 0;
+lines[i].gridfitted = 0;
+}
+}
+int QTextEngine::formatIndex(const QScriptItem *si) const
+{
+if (specialData && !specialData->resolvedFormatIndices.isEmpty())
+return specialData->resolvedFormatIndices.at(si - &layoutData->items[0]);
+QTextDocumentPrivate *p = block.docHandle();
+if (!p)
+return -1;
+int pos = si->position;
+if (specialData && si->position >= specialData->preeditPosition) {
+if (si->position < specialData->preeditPosition + specialData->preeditText.length())
+pos = qMax(specialData->preeditPosition - 1, 0);
+else
+pos -= specialData->preeditText.length();
+}
+QTextDocumentPrivate::FragmentIterator it = p->find(block.position() + pos);
+return it.value()->format;
+}
+QTextCharFormat QTextEngine::format(const QScriptItem *si) const
+{
+QTextCharFormat format;
+const QTextFormatCollection *formats = 0;
+if (block.docHandle()) {
+formats = this->formats();
+format = formats->charFormat(formatIndex(si));
+}
+if (specialData && specialData->resolvedFormatIndices.isEmpty()) {
+int end = si->position + length(si);
+for (int i = 0; i < specialData->addFormats.size(); ++i) {
+const QTextLayout::FormatRange &r = specialData->addFormats.at(i);
+if (r.start <= si->position && r.start + r.length >= end) {
+if (!specialData->addFormatIndices.isEmpty())
+format.merge(formats->format(specialData->addFormatIndices.at(i)));
+else
+format.merge(r.format);
+}
+}
+}
+return format;
+}
+void QTextEngine::addRequiredBoundaries() const
+{
+if (specialData) {
+for (int i = 0; i < specialData->addFormats.size(); ++i) {
+const QTextLayout::FormatRange &r = specialData->addFormats.at(i);
+setBoundary(r.start);
+setBoundary(r.start + r.length);
+//qDebug("adding boundaries %d %d", r.start, r.start+r.length);
+}
+}
+}
+bool QTextEngine::atWordSeparator(int position) const
+{
+const QChar c = layoutData->string.at(position);
+switch (c.toLatin1()) {
+case '.':
+case ',':
+case '?':
+case '!':
+case ':':
+case ';':
+case '-':
+case '<':
+case '>':
+case '[':
+case ']':
+case '(':
+case ')':
+case '{':
+case '}':
+case '=':
+case '/':
+case '+':
+case '%':
+case '&':
+case '^':
+case '*':
+case '\'':
+case '"':
+case '~':
+case '|':
+return true;
+default:
+return false;
+}
+}
+bool QTextEngine::atSpace(int position) const
+{
+const QChar c = layoutData->string.at(position);
+return c == QLatin1Char(' ')
+|| c == QChar::Nbsp
+|| c == QChar::LineSeparator
+|| c == QLatin1Char('\t')
+;
+}
+void QTextEngine::indexAdditionalFormats()
+{
+if (!block.docHandle())
+return;
+specialData->addFormatIndices.resize(specialData->addFormats.count());
+QTextFormatCollection * const formats = this->formats();
+for (int i = 0; i < specialData->addFormats.count(); ++i) {
+specialData->addFormatIndices[i] = formats->indexForFormat(specialData->addFormats.at(i).format);
+specialData->addFormats[i].format = QTextCharFormat();
+}
+}
+/* These two helper functions are used to determine whether we need to insert a ZWJ character
+between the text that gets truncated and the ellipsis. This is important to get
+correctly shaped results for arabic text.
+*/
+static bool nextCharJoins(const QString &string, int pos)
+{
+while (pos < string.length() && string.at(pos).category() == QChar::Mark_NonSpacing)
+++pos;
+if (pos == string.length())
+return false;
+return string.at(pos).joining() != QChar::OtherJoining;
+}
+static bool prevCharJoins(const QString &string, int pos)
+{
+while (pos > 0 && string.at(pos - 1).category() == QChar::Mark_NonSpacing)
+--pos;
+if (pos == 0)
+return false;
+return (string.at(pos - 1).joining() == QChar::Dual || string.at(pos - 1).joining() == QChar::Center);
+}
+QString QTextEngine::elidedText(Qt::TextElideMode mode, const QFixed &width, int flags) const
+{
+//    qDebug() << "elidedText; available width" << width.toReal() << "text width:" << this->width(0, layoutData->string.length()).toReal();
+if (flags & Qt::TextShowMnemonic) {
+itemize();
+for (int i = 0; i < layoutData->items.size(); ++i) {
+QScriptItem &si = layoutData->items[i];
+if (!si.num_glyphs)
+shape(i);
+HB_CharAttributes *attributes = const_cast<HB_CharAttributes *>(this->attributes());
+unsigned short *logClusters = this->logClusters(&si);
+QGlyphLayout glyphs = shapedGlyphs(&si);
+const int end = si.position + length(&si);
+for (int i = si.position; i < end - 1; ++i)
+if (layoutData->string.at(i) == QLatin1Char('&')) {
+const int gp = logClusters[i - si.position];
+glyphs.attributes[gp].dontPrint = true;
+attributes[i + 1].charStop = false;
+attributes[i + 1].whiteSpace = false;
+attributes[i + 1].lineBreakType = HB_NoBreak;
+if (i < end - 1
+&& layoutData->string.at(i + 1) == QLatin1Char('&'))
+++i;
+}
+}
+}
+validate();
+if (mode == Qt::ElideNone
+|| this->width(0, layoutData->string.length()) <= width
+|| layoutData->string.length() <= 1)
+return layoutData->string;
+QFixed ellipsisWidth;
+QString ellipsisText;
+{
+QChar ellipsisChar(0x2026);
+QFontEngine *fe = fnt.d->engineForScript(QUnicodeTables::Common);
+QGlyphLayoutArray<1> ellipsisGlyph;
+{
+QFontEngine *feForEllipsis = (fe->type() == QFontEngine::Multi)
+? static_cast<QFontEngineMulti *>(fe)->engine(0)
+: fe;
+if (feForEllipsis->type() == QFontEngine::Mac)
+feForEllipsis = fe;
+// the lookup can be really slow when we use XLFD fonts
+if (feForEllipsis->type() != QFontEngine::XLFD
+&& feForEllipsis->canRender(&ellipsisChar, 1)) {
+int nGlyphs = 1;
+feForEllipsis->stringToCMap(&ellipsisChar, 1, &ellipsisGlyph, &nGlyphs, 0);
+}
+}
+if (ellipsisGlyph.glyphs[0]) {
+ellipsisWidth = ellipsisGlyph.advances_x[0];
+ellipsisText = ellipsisChar;
+} else {
+QString dotDotDot(QLatin1String("..."));
+QGlyphLayoutArray<3> glyphs;
+int nGlyphs = 3;
+if (!fe->stringToCMap(dotDotDot.constData(), 3, &glyphs, &nGlyphs, 0))
+// should never happen...
+return layoutData->string;
+for (int i = 0; i < nGlyphs; ++i)
+ellipsisWidth += glyphs.advances_x[i];
+ellipsisText = dotDotDot;
+}
+}
+const QFixed availableWidth = width - ellipsisWidth;
+if (availableWidth < 0)
+return QString();
+const HB_CharAttributes *attributes = this->attributes();
+if (mode == Qt::ElideRight) {
+QFixed currentWidth;
+int pos = 0;
+int nextBreak = 0;
+do {
+pos = nextBreak;
+++nextBreak;
+while (nextBreak < layoutData->string.length() && !attributes[nextBreak].charStop)
+++nextBreak;
+currentWidth += this->width(pos, nextBreak - pos);
+} while (nextBreak < layoutData->string.length()
+&& currentWidth < availableWidth);
+if (nextCharJoins(layoutData->string, pos))
+ellipsisText.prepend(QChar(0x200d) /* ZWJ */);
+return layoutData->string.left(pos) + ellipsisText;
+} else if (mode == Qt::ElideLeft) {
+QFixed currentWidth;
+int pos = layoutData->string.length();
+int nextBreak = layoutData->string.length();
+do {
+pos = nextBreak;
+--nextBreak;
+while (nextBreak > 0 && !attributes[nextBreak].charStop)
+--nextBreak;
+currentWidth += this->width(nextBreak, pos - nextBreak);
+} while (nextBreak > 0
+&& currentWidth < availableWidth);
+if (prevCharJoins(layoutData->string, pos))
+ellipsisText.append(QChar(0x200d) /* ZWJ */);
+return ellipsisText + layoutData->string.mid(pos);
+} else if (mode == Qt::ElideMiddle) {
+QFixed leftWidth;
+QFixed rightWidth;
+int leftPos = 0;
+int nextLeftBreak = 0;
+int rightPos = layoutData->string.length();
+int nextRightBreak = layoutData->string.length();
+do {
+leftPos = nextLeftBreak;
+rightPos = nextRightBreak;
+++nextLeftBreak;
+while (nextLeftBreak < layoutData->string.length() && !attributes[nextLeftBreak].charStop)
+++nextLeftBreak;
+--nextRightBreak;
+while (nextRightBreak > 0 && !attributes[nextRightBreak].charStop)
+--nextRightBreak;
+leftWidth += this->width(leftPos, nextLeftBreak - leftPos);
+rightWidth += this->width(nextRightBreak, rightPos - nextRightBreak);
+} while (nextLeftBreak < layoutData->string.length()
+&& nextRightBreak > 0
+&& leftWidth + rightWidth < availableWidth);
+if (nextCharJoins(layoutData->string, leftPos))
+ellipsisText.prepend(QChar(0x200d) /* ZWJ */);
+if (prevCharJoins(layoutData->string, rightPos))
+ellipsisText.append(QChar(0x200d) /* ZWJ */);
+return layoutData->string.left(leftPos) + ellipsisText + layoutData->string.mid(rightPos);
+}
+return layoutData->string;
+}
+void QTextEngine::setBoundary(int strPos) const
+{
+if (strPos <= 0 || strPos >= layoutData->string.length())
+return;
+int itemToSplit = 0;
+while (itemToSplit < layoutData->items.size() && layoutData->items[itemToSplit].position <= strPos)
+itemToSplit++;
+itemToSplit--;
+if (layoutData->items[itemToSplit].position == strPos) {
+// already a split at the requested position
+return;
+}
+splitItem(itemToSplit, strPos - layoutData->items[itemToSplit].position);
+}
+void QTextEngine::splitItem(int item, int pos) const
+{
+if (pos <= 0)
+return;
+layoutData->items.insert(item + 1, QScriptItem(layoutData->items[item]));
+QScriptItem &oldItem = layoutData->items[item];
+QScriptItem &newItem = layoutData->items[item+1];
+newItem.position += pos;
+if (oldItem.num_glyphs) {
+// already shaped, break glyphs aswell
+int breakGlyph = logClusters(&oldItem)[pos];
+newItem.num_glyphs = oldItem.num_glyphs - breakGlyph;
+oldItem.num_glyphs = breakGlyph;
+newItem.glyph_data_offset = oldItem.glyph_data_offset + breakGlyph;
+for (int i = 0; i < newItem.num_glyphs; i++)
+logClusters(&newItem)[i] -= breakGlyph;
+QFixed w = 0;
+const QGlyphLayout g = shapedGlyphs(&oldItem);
+for(int j = 0; j < breakGlyph; ++j)
+w += g.advances_x[j];
+newItem.width = oldItem.width - w;
+oldItem.width = w;
+}
+//     qDebug("split at position %d itempos=%d", pos, item);
+}
+extern int qt_defaultDpiY();
+QFixed QTextEngine::calculateTabWidth(int item, QFixed x) const
+{
+const QScriptItem &si = layoutData->items[item];
+QFixed dpiScale = 1;
+if (block.docHandle() && block.docHandle()->layout()) {
+QPaintDevice *pdev = block.docHandle()->layout()->paintDevice();
+if (pdev)
+dpiScale = QFixed::fromReal(pdev->logicalDpiY() / qreal(qt_defaultDpiY()));
+} else {
+dpiScale = QFixed::fromReal(fnt.d->dpi / qreal(qt_defaultDpiY()));
+}
+QList<QTextOption::Tab> tabArray = option.tabs();
+if (!tabArray.isEmpty()) {
+if (option.textDirection() == Qt::RightToLeft) { // rebase the tabArray positions.
+QList<QTextOption::Tab> newTabs;
+QList<QTextOption::Tab>::Iterator iter = tabArray.begin();
+while(iter != tabArray.end()) {
+QTextOption::Tab tab = *iter;
+if (tab.type == QTextOption::LeftTab)
+tab.type = QTextOption::RightTab;
+else if (tab.type == QTextOption::RightTab)
+tab.type = QTextOption::LeftTab;
+newTabs << tab;
+++iter;
+}
+tabArray = newTabs;
+}
+for (int i = 0; i < tabArray.size(); ++i) {
+QFixed tab = QFixed::fromReal(tabArray[i].position) * dpiScale;
+if (tab > x) {  // this is the tab we need.
+QTextOption::Tab tabSpec = tabArray[i];
+int tabSectionEnd = layoutData->string.count();
+if (tabSpec.type == QTextOption::RightTab || tabSpec.type == QTextOption::CenterTab) {
+// find next tab to calculate the width required.
+tab = QFixed::fromReal(tabSpec.position);
+for (int i=item + 1; i < layoutData->items.count(); i++) {
+const QScriptItem &item = layoutData->items[i];
+if (item.analysis.flags == QScriptAnalysis::TabOrObject) { // found it.
+tabSectionEnd = item.position;
+break;
+}
+}
+}
+else if (tabSpec.type == QTextOption::DelimiterTab)
+// find delimitor character to calculate the width required
+tabSectionEnd = qMax(si.position, layoutData->string.indexOf(tabSpec.delimiter, si.position) + 1);
+if (tabSectionEnd > si.position) {
+QFixed length;
+// Calculate the length of text between this tab and the tabSectionEnd
+for (int i=item; i < layoutData->items.count(); i++) {
+QScriptItem &item = layoutData->items[i];
+if (item.position > tabSectionEnd || item.position <= si.position)
+continue;
+shape(i); // first, lets make sure relevant text is already shaped
+QGlyphLayout glyphs = this->shapedGlyphs(&item);
+const int end = qMin(item.position + item.num_glyphs, tabSectionEnd) - item.position;
+for (int i=0; i < end; i++)
+length += glyphs.advances_x[i] * !glyphs.attributes[i].dontPrint;
+if (end + item.position == tabSectionEnd && tabSpec.type == QTextOption::DelimiterTab) // remove half of matching char
+length -= glyphs.advances_x[end] / 2 * !glyphs.attributes[end].dontPrint;
+}
+switch (tabSpec.type) {
+case QTextOption::CenterTab:
+length /= 2;
+// fall through
+case QTextOption::DelimiterTab:
+// fall through
+case QTextOption::RightTab:
+tab = QFixed::fromReal(tabSpec.position) * dpiScale - length;
+if (tab < 0) // default to tab taking no space
+return QFixed();
+break;
+case QTextOption::LeftTab:
+break;
+}
+}
+return tab - x;
+}
+}
+}
+QFixed tab = QFixed::fromReal(option.tabStop());
+if (tab <= 0)
+tab = 80; // default
+tab *= dpiScale;
+QFixed nextTabPos = ((x / tab).truncate() + 1) * tab;
+QFixed tabWidth = nextTabPos - x;
+return tabWidth;
+}
+void QTextEngine::resolveAdditionalFormats() const
+{
+if (!specialData || specialData->addFormats.isEmpty()
+|| !block.docHandle()
+|| !specialData->resolvedFormatIndices.isEmpty())
+return;
+QTextFormatCollection *collection = this->formats();
+specialData->resolvedFormatIndices.clear();
+QVector<int> indices(layoutData->items.count());
+for (int i = 0; i < layoutData->items.count(); ++i) {
+QTextCharFormat f = format(&layoutData->items.at(i));
+indices[i] = collection->indexForFormat(f);
+}
+specialData->resolvedFormatIndices = indices;
+}
+QStackTextEngine::QStackTextEngine(const QString &string, const QFont &f)
+: _layoutData(string, _memory, MemSize)
+{
+fnt = f;
+text = string;
+stackEngine = true;
+layoutData = &_layoutData;
+}
+QTextItemInt::QTextItemInt(const QScriptItem &si, QFont *font, const QTextCharFormat &format)
+: justified(false), underlineStyle(QTextCharFormat::NoUnderline), charFormat(format),
+num_chars(0), chars(0), logClusters(0), f(0), fontEngine(0)
+{
+// explicitly initialize flags so that initFontAttributes can be called
+// multiple times on the same TextItem
+flags = 0;
+if (si.analysis.bidiLevel %2)
+flags |= QTextItem::RightToLeft;
+ascent = si.ascent;
+descent = si.descent;
+f = font;
+fontEngine = f->d->engineForScript(si.analysis.script);
+Q_ASSERT(fontEngine);
+if (format.hasProperty(QTextFormat::TextUnderlineStyle)) {
+underlineStyle = format.underlineStyle();
+} else if (format.boolProperty(QTextFormat::FontUnderline)
+|| f->d->underline) {
+underlineStyle = QTextCharFormat::SingleUnderline;
+}
+// compat
+if (underlineStyle == QTextCharFormat::SingleUnderline)
+flags |= QTextItem::Underline;
+if (f->d->overline || format.fontOverline())
+flags |= QTextItem::Overline;
+if (f->d->strikeOut || format.fontStrikeOut())
+flags |= QTextItem::StrikeOut;
+}
+QTextItemInt QTextItemInt::midItem(QFontEngine *fontEngine, int firstGlyphIndex, int numGlyphs) const
+{
+QTextItemInt ti = *this;
+const int end = firstGlyphIndex + numGlyphs;
+ti.glyphs = glyphs.mid(firstGlyphIndex, numGlyphs);
+ti.fontEngine = fontEngine;
+if (logClusters && chars) {
+const int logClusterOffset = logClusters[0];
+while (logClusters[ti.chars - chars] - logClusterOffset < firstGlyphIndex)
+++ti.chars;
+ti.logClusters += (ti.chars - chars);
+ti.num_chars = 0;
+int char_start = ti.chars - chars;
+while (char_start + ti.num_chars < num_chars && ti.logClusters[ti.num_chars] - logClusterOffset < end)
+++ti.num_chars;
+}
+return ti;
+}
+QTransform qt_true_matrix(qreal w, qreal h, QTransform x)
+{
+QRectF rect = x.mapRect(QRectF(0, 0, w, h));
+return x * QTransform::fromTranslate(-rect.x(), -rect.y());
+}
+glyph_metrics_t glyph_metrics_t::transformed(const QTransform &matrix) const
+{
+if (matrix.type() < QTransform::TxTranslate)
+return *this;
+glyph_metrics_t m = *this;
+qreal w = width.toReal();
+qreal h = height.toReal();
+QTransform xform = qt_true_matrix(w, h, matrix);
+QRectF rect(0, 0, w, h);
+rect = xform.mapRect(rect);
+m.width = QFixed::fromReal(rect.width());
+m.height = QFixed::fromReal(rect.height());
+QLineF l = xform.map(QLineF(x.toReal(), y.toReal(), xoff.toReal(), yoff.toReal()));
+m.x = QFixed::fromReal(l.x1());
+m.y = QFixed::fromReal(l.y1());
+// The offset is relative to the baseline which is why we use dx/dy of the line
+m.xoff = QFixed::fromReal(l.dx());
+m.yoff = QFixed::fromReal(l.dy());
+return m;
+}
+QT_END_NAMESPACE

changeset 0	1918ee327afb
child 3	41300fa6a67c