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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
commite5fcad302d86d316390c6b0f62759a067313e8a9 (patch)
treec2afbf6f1066b6ce261f14341cf6d310e5595bc1 /src/gui/text/qtextengine_mac.cpp
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Long live Qt 4.5!
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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