Long live Qt 4.5!

1 files changed, 656 insertions, 0 deletions

diff --git a/src/gui/text/qtextengine_mac.cpp b/src/gui/text/qtextengine_mac.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qtextengine_p.h"
+
+QT_BEGIN_NAMESPACE
+
+// 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_ASSERT(num_glyphs <= length);
+    Q_UNUSED(num_glyphs);
+
+//     qDebug("QScriptEngine::heuristicSetGlyphAttributes, num_glyphs=%d", item->num_glyphs);
+
+    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]) {
+            ++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;
+
+        // 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;
+}
+
+struct QArabicProperties {
+    unsigned char shape;
+    unsigned char justification;
+};
+Q_DECLARE_TYPEINFO(QArabicProperties, Q_PRIMITIVE_TYPE);
+
+enum QArabicShape {
+    XIsolated,
+    XFinal,
+    XInitial,
+    XMedial,
+    // intermediate state
+    XCausing
+};
+
+
+// these groups correspond to the groups defined in the Unicode standard.
+// Some of these groups are equal with regards to both joining and line breaking behaviour,
+// and thus have the same enum value
+//
+// I'm not sure the mapping of syriac to arabic enums is correct with regards to justification, but as
+// I couldn't find any better document I'll hope for the best.
+enum ArabicGroup {
+    // NonJoining
+    ArabicNone,
+    ArabicSpace,
+    // Transparent
+    Transparent,
+    // Causing
+    Center,
+    Kashida,
+
+    // Arabic
+    // Dual
+    Beh,
+    Noon,
+    Meem = Noon,
+    Heh = Noon,
+    KnottedHeh = Noon,
+    HehGoal = Noon,
+    SwashKaf = Noon,
+    Yeh,
+    Hah,
+    Seen,
+    Sad = Seen,
+    Tah,
+    Kaf = Tah,
+    Gaf = Tah,
+    Lam = Tah,
+    Ain,
+    Feh = Ain,
+    Qaf = Ain,
+    // Right
+    Alef,
+    Waw,
+    Dal,
+    TehMarbuta = Dal,
+    Reh,
+    HamzaOnHehGoal,
+    YehWithTail = HamzaOnHehGoal,
+    YehBarre = HamzaOnHehGoal,
+
+    // Syriac
+    // Dual
+    Beth = Beh,
+    Gamal = Ain,
+    Heth = Noon,
+    Teth = Hah,
+    Yudh = Noon,
+    Kaph = Noon,
+    Lamadh = Lam,
+    Mim = Noon,
+    Nun = Noon,
+    Semakh = Noon,
+    FinalSemakh = Noon,
+    SyriacE = Ain,
+    Pe = Ain,
+    ReversedPe = Hah,
+    Qaph = Noon,
+    Shin = Noon,
+    Fe = Ain,
+
+    // Right
+    Alaph = Alef,
+    Dalath = Dal,
+    He = Dal,
+    SyriacWaw = Waw,
+    Zain = Alef,
+    YudhHe = Waw,
+    Sadhe = HamzaOnHehGoal,
+    Taw = Dal,
+
+    // Compiler bug? Otherwise ArabicGroupsEnd would be equal to Dal + 1.
+    Dummy = HamzaOnHehGoal,
+    ArabicGroupsEnd
+};
+
+static const unsigned char arabic_group[0x150] = {
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    ArabicNone, ArabicNone, Alef, Alef,
+    Waw, Alef, Yeh, Alef,
+    Beh, TehMarbuta, Beh, Beh,
+    Hah, Hah, Hah, Dal,
+
+    Dal, Reh, Reh, Seen,
+    Seen, Sad, Sad, Tah,
+    Tah, Ain, Ain, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    // 0x640
+    Kashida, Feh, Qaf, Kaf,
+    Lam, Meem, Noon, Heh,
+    Waw, Yeh, Yeh, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, Beh, Qaf,
+
+    Transparent, Alef, Alef, Alef,
+    ArabicNone, Alef, Waw, Waw,
+    Yeh, Beh, Beh, Beh,
+    Beh, Beh, Beh, Beh,
+
+    // 0x680
+    Beh, Hah, Hah, Hah,
+    Hah, Hah, Hah, Hah,
+    Dal, Dal, Dal, Dal,
+    Dal, Dal, Dal, Dal,
+
+    Dal, Reh, Reh, Reh,
+    Reh, Reh, Reh, Reh,
+    Reh, Reh, Seen, Seen,
+    Seen, Sad, Sad, Tah,
+
+    Ain, Feh, Feh, Feh,
+    Feh, Feh, Feh, Qaf,
+    Qaf, Gaf, SwashKaf, Gaf,
+    Kaf, Kaf, Kaf, Gaf,
+
+    Gaf, Gaf, Gaf, Gaf,
+    Gaf, Lam, Lam, Lam,
+    Lam, Noon, Noon, Noon,
+    Noon, Noon, KnottedHeh, Hah,
+
+    // 0x6c0
+    TehMarbuta, HehGoal, HamzaOnHehGoal, HamzaOnHehGoal,
+    Waw, Waw, Waw, Waw,
+    Waw, Waw, Waw, Waw,
+    Yeh, YehWithTail, Yeh, Waw,
+
+    Yeh, Yeh, YehBarre, YehBarre,
+    ArabicNone, TehMarbuta, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, ArabicNone, ArabicNone, Transparent,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, ArabicNone, ArabicNone, Transparent,
+    Transparent, ArabicNone, Transparent, Transparent,
+    Transparent, Transparent, Dal, Reh,
+
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, Seen, Sad,
+    Ain, ArabicNone, ArabicNone, KnottedHeh,
+
+    // 0x700
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    Alaph, Transparent, Beth, Gamal,
+    Gamal, Dalath, Dalath, He,
+    SyriacWaw, Zain, Heth, Teth,
+    Teth, Yudh, YudhHe, Kaph,
+
+    Lamadh, Mim, Nun, Semakh,
+    FinalSemakh, SyriacE, Pe, ReversedPe,
+    Sadhe, Qaph, Dalath, Shin,
+    Taw, Beth, Gamal, Dalath,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, ArabicNone,
+    ArabicNone, Zain, Kaph, Fe,
+};
+
+static inline ArabicGroup arabicGroup(unsigned short uc)
+{
+    if (uc >= 0x0600 && uc < 0x750)
+        return (ArabicGroup) arabic_group[uc-0x600];
+    else if (uc == 0x200d)
+        return Center;
+    else if (QChar::category(uc) == QChar::Separator_Space)
+        return ArabicSpace;
+    else
+        return ArabicNone;
+}
+
+
+/*
+   Arabic shaping obeys a number of rules according to the joining classes (see Unicode book, section on
+   arabic).
+
+   Each unicode char has a joining class (right, dual (left&right), center (joincausing) or transparent).
+   transparent joining is not encoded in QChar::joining(), but applies to all combining marks and format marks.
+
+   Right join-causing: dual + center
+   Left join-causing: dual + right + center
+
+   Rules are as follows (for a string already in visual order, as we have it here):
+
+   R1 Transparent characters do not affect joining behaviour.
+   R2 A right joining character, that has a right join-causing char on the right will get form XRight
+   (R3 A left joining character, that has a left join-causing char on the left will get form XLeft)
+   Note: the above rule is meaningless, as there are no pure left joining characters defined in Unicode
+   R4 A dual joining character, that has a left join-causing char on the left and a right join-causing char on
+             the right will get form XMedial
+   R5  A dual joining character, that has a right join causing char on the right, and no left join causing char on the left
+         will get form XRight
+   R6 A dual joining character, that has a  left join causing char on the left, and no right join causing char on the right
+         will get form XLeft
+   R7 Otherwise the character will get form XIsolated
+
+   Additionally we have to do the minimal ligature support for lam-alef ligatures:
+
+   L1 Transparent characters do not affect ligature behaviour.
+   L2 Any sequence of Alef(XRight) + Lam(XMedial) will form the ligature Alef.Lam(XLeft)
+   L3 Any sequence of Alef(XRight) + Lam(XLeft) will form the ligature Alef.Lam(XIsolated)
+
+   The state table below handles rules R1-R7.
+*/
+
+enum Joining {
+    JNone,
+    JCausing,
+    JDual,
+    JRight,
+    JTransparent
+};
+
+static const Joining joining_for_group[ArabicGroupsEnd] = {
+    // NonJoining
+    JNone, // ArabicNone
+    JNone, // ArabicSpace
+    // Transparent
+    JTransparent, // Transparent
+    // Causing
+    JCausing, // Center
+    JCausing, // Kashida
+    // Dual
+    JDual, // Beh
+    JDual, // Noon
+    JDual, // Yeh
+    JDual, // Hah
+    JDual, // Seen
+    JDual, // Tah
+    JDual, // Ain
+    // Right
+    JRight, // Alef
+    JRight, // Waw
+    JRight, // Dal
+    JRight, // Reh
+    JRight  // HamzaOnHehGoal
+};
+
+
+struct JoiningPair {
+    QArabicShape form1;
+    QArabicShape form2;
+};
+
+static const JoiningPair joining_table[5][4] =
+// None, Causing, Dual, Right
+{
+    { { XIsolated, XIsolated }, { XIsolated, XCausing }, { XIsolated, XInitial }, { XIsolated, XIsolated } }, // XIsolated
+    { { XFinal, XIsolated }, { XFinal, XCausing }, { XFinal, XInitial }, { XFinal, XIsolated } }, // XFinal
+    { { XIsolated, XIsolated }, { XInitial, XCausing }, { XInitial, XMedial }, { XInitial, XFinal } }, // XInitial
+    { { XFinal, XIsolated }, { XMedial, XCausing }, { XMedial, XMedial }, { XMedial, XFinal } }, // XMedial
+    { { XIsolated, XIsolated }, { XIsolated, XCausing }, { XIsolated, XMedial }, { XIsolated, XFinal } }, // XCausing
+};
+
+
+/*
+According to http://www.microsoft.com/middleeast/Arabicdev/IE6/KBase.asp
+
+1. Find the priority of the connecting opportunities in each word
+2. Add expansion at the highest priority connection opportunity
+3. If more than one connection opportunity have the same highest value,
+   use the opportunity closest to the end of the word.
+
+Following is a chart that provides the priority for connection
+opportunities and where expansion occurs. The character group names
+are those in table 6.6 of the UNICODE 2.0 book.
+
+
+PrioritY        Glyph                   Condition                                       Kashida Location
+
+Arabic_Kashida        User inserted Kashida   The user entered a Kashida in a position.       After the user
+                (Shift+j or Shift+[E with hat])    Thus, it is the highest priority to insert an   inserted kashida
+                                        automatic kashida.
+
+Arabic_Seen        Seen, Sad               Connecting to the next character.               After the character.
+                                        (Initial or medial form).
+
+Arabic_HaaDal        Teh Marbutah, Haa, Dal  Connecting to previous character.               Before the final form
+                                                                                        of these characters.
+
+Arabic_Alef     Alef, Tah, Lam,         Connecting to previous character.               Before the final form
+                Kaf and Gaf                                                             of these characters.
+
+Arabic_BaRa     Reh, Yeh                Connected to medial Beh                         Before preceding medial Baa
+
+Arabic_Waw        Waw, Ain, Qaf, Feh      Connecting to previous character.               Before the final form of
+                                                                                        these characters.
+
+Arabic_Normal   Other connecting        Connecting to previous character.               Before the final form
+                characters                                                              of these characters.
+
+
+
+This seems to imply that we have at most one kashida point per arabic word.
+
+*/
+
+void qt_getArabicProperties(const unsigned short *chars, int len, QArabicProperties *properties)
+{
+//     qDebug("arabicSyriacOpenTypeShape: properties:");
+    int lastPos = 0;
+    int lastGroup = ArabicNone;
+
+    ArabicGroup group = arabicGroup(chars[0]);
+    Joining j = joining_for_group[group];
+    QArabicShape shape = joining_table[XIsolated][j].form2;
+    properties[0].justification = HB_NoJustification;
+
+    for (int i = 1; i < len; ++i) {
+        // #### fix handling for spaces and punktuation
+        properties[i].justification = HB_NoJustification;
+
+        group = arabicGroup(chars[i]);
+        j = joining_for_group[group];
+
+        if (j == JTransparent) {
+            properties[i].shape = XIsolated;
+            continue;
+        }
+
+        properties[lastPos].shape = joining_table[shape][j].form1;
+        shape = joining_table[shape][j].form2;
+
+        switch(lastGroup) {
+        case Seen:
+            if (properties[lastPos].shape == XInitial || properties[lastPos].shape == XMedial)
+                properties[i-1].justification = HB_Arabic_Seen;
+            break;
+        case Hah:
+            if (properties[lastPos].shape == XFinal)
+                properties[lastPos-1].justification = HB_Arabic_HaaDal;
+            break;
+        case Alef:
+            if (properties[lastPos].shape == XFinal)
+                properties[lastPos-1].justification = HB_Arabic_Alef;
+            break;
+        case Ain:
+            if (properties[lastPos].shape == XFinal)
+                properties[lastPos-1].justification = HB_Arabic_Waw;
+            break;
+        case Noon:
+            if (properties[lastPos].shape == XFinal)
+                properties[lastPos-1].justification = HB_Arabic_Normal;
+            break;
+        case ArabicNone:
+            break;
+
+        default:
+            Q_ASSERT(false);
+        }
+
+        lastGroup = ArabicNone;
+
+        switch(group) {
+        case ArabicNone:
+        case Transparent:
+        // ### Center should probably be treated as transparent when it comes to justification.
+        case Center:
+            break;
+        case ArabicSpace:
+            properties[i].justification = HB_Arabic_Space;
+            break;
+        case Kashida:
+            properties[i].justification = HB_Arabic_Kashida;
+            break;
+        case Seen:
+            lastGroup = Seen;
+            break;
+
+        case Hah:
+        case Dal:
+            lastGroup = Hah;
+            break;
+
+        case Alef:
+        case Tah:
+            lastGroup = Alef;
+            break;
+
+        case Yeh:
+        case Reh:
+            if (properties[lastPos].shape == XMedial && arabicGroup(chars[lastPos]) == Beh)
+                properties[lastPos-1].justification = HB_Arabic_BaRa;
+            break;
+
+        case Ain:
+        case Waw:
+            lastGroup = Ain;
+            break;
+
+        case Noon:
+        case Beh:
+        case HamzaOnHehGoal:
+            lastGroup = Noon;
+            break;
+        case ArabicGroupsEnd:
+            Q_ASSERT(false);
+        }
+
+        lastPos = i;
+    }
+    properties[lastPos].shape = joining_table[shape][JNone].form1;
+
+
+//     for (int i = 0; i < len; ++i)
+//         qDebug("arabic properties(%d): uc=%x shape=%d, justification=%d", i, chars[i], properties[i].shape, properties[i].justification);
+}
+
+void QTextEngine::shapeTextMac(int item) const
+{
+    QScriptItem &si = layoutData->items[item];
+
+    si.glyph_data_offset = layoutData->used;
+
+    QFontEngine *font = fontEngine(si, &si.ascent, &si.descent);
+    if (font->type() != QFontEngine::Multi) {
+        shapeTextWithHarfbuzz(item);
+        return;
+    }
+    
+#ifndef QT_MAC_USE_COCOA
+    QFontEngineMacMulti *fe = static_cast<QFontEngineMacMulti *>(font);
+#else
+    QCoreTextFontEngineMulti *fe = static_cast<QCoreTextFontEngineMulti *>(font);
+#endif
+    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);
+        g.numGlyphs = num_glyphs;
+        unsigned short *log_clusters = logClusters(&si);
+
+        if (fe->stringToCMap(str,
+                             len,
+                             &g,
+                             &num_glyphs,
+                             flags,
+                             log_clusters,
+                             attributes())) {
+
+		heuristicSetGlyphAttributes(str, len, &g, log_clusters, num_glyphs);
+		break;
+	}
+    }
+
+    si.num_glyphs = num_glyphs;
+
+    layoutData->used += si.num_glyphs;
+
+    QGlyphLayout g = shapedGlyphs(&si);
+
+    if (si.analysis.script == QUnicodeTables::Arabic) {
+        QVarLengthArray<QArabicProperties> props(len + 2);
+        QArabicProperties *properties = props.data();
+        int f = si.position;
+        int l = len;
+        if (f > 0) {
+            --f;
+            ++l;
+            ++properties;
+        }
+        if (f + l < layoutData->string.length()) {
+            ++l;
+        }
+        qt_getArabicProperties((const unsigned short *)(layoutData->string.unicode()+f), l, props.data());
+
+        unsigned short *log_clusters = logClusters(&si);
+
+        for (int i = 0; i < len; ++i) {
+            int gpos = log_clusters[i];
+            g.attributes[gpos].justification = properties[i].justification;
+        }
+    }
+
+    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;
+}
+
+QT_END_NAMESPACE