Use freetype font engine on Windows

As windows' fontdatabases also uses functionalities from
qbasicunixfontdatabase it was renamed to qbasicfontdatabase. But instead
of iterating over the font directories' files it uses system calls to
obtain the list of fonts and uses registry values to find the according
filenames to add.
The native font engine was still kept. It can be activated by adding
fontengine=native as platformargument.

Change-Id: I7197bed5d18b8a33d4aa97ce91bfa1cd281b80ea
Reviewed-on: http://codereview.qt-project.org/5839
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@nokia.com>
Sanity-Review: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@nokia.com>

1 files changed, 428 insertions, 0 deletions

diff --git a/src/platformsupport/fontdatabases/basic/qbasicfontdatabase.cpp b/src/platformsupport/fontdatabases/basic/qbasicfontdatabase.cpp
new file mode 100644
index 0000000000..329a1176c6
--- /dev/null
+++ b/src/platformsupport/fontdatabases/basic/qbasicfontdatabase.cpp
@@ -0,0 +1,428 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qbasicfontdatabase_p.h"
+
+#include <QtGui/private/qguiapplication_p.h>
+#include <QtGui/QPlatformScreen>
+
+#include <QtCore/QFile>
+#include <QtCore/QLibraryInfo>
+#include <QtCore/QDir>
+#include <QtCore/QUuid>
+
+#undef QT_NO_FREETYPE
+#include <QtGui/private/qfontengine_ft_p.h>
+#include <QtGui/private/qfontengine_p.h>
+
+#include <ft2build.h>
+#include FT_TRUETYPE_TABLES_H
+
+#define SimplifiedChineseCsbBit 18
+#define TraditionalChineseCsbBit 20
+#define JapaneseCsbBit 17
+#define KoreanCsbBit 21
+
+static int requiredUnicodeBits[QFontDatabase::WritingSystemsCount][2] = {
+        // Any,
+    { 127, 127 },
+        // Latin,
+    { 0, 127 },
+        // Greek,
+    { 7, 127 },
+        // Cyrillic,
+    { 9, 127 },
+        // Armenian,
+    { 10, 127 },
+        // Hebrew,
+    { 11, 127 },
+        // Arabic,
+    { 13, 127 },
+        // Syriac,
+    { 71, 127 },
+    //Thaana,
+    { 72, 127 },
+    //Devanagari,
+    { 15, 127 },
+    //Bengali,
+    { 16, 127 },
+    //Gurmukhi,
+    { 17, 127 },
+    //Gujarati,
+    { 18, 127 },
+    //Oriya,
+    { 19, 127 },
+    //Tamil,
+    { 20, 127 },
+    //Telugu,
+    { 21, 127 },
+    //Kannada,
+    { 22, 127 },
+    //Malayalam,
+    { 23, 127 },
+    //Sinhala,
+    { 73, 127 },
+    //Thai,
+    { 24, 127 },
+    //Lao,
+    { 25, 127 },
+    //Tibetan,
+    { 70, 127 },
+    //Myanmar,
+    { 74, 127 },
+        // Georgian,
+    { 26, 127 },
+        // Khmer,
+    { 80, 127 },
+        // SimplifiedChinese,
+    { 126, 127 },
+        // TraditionalChinese,
+    { 126, 127 },
+        // Japanese,
+    { 126, 127 },
+        // Korean,
+    { 56, 127 },
+        // Vietnamese,
+    { 0, 127 }, // same as latin1
+        // Other,
+    { 126, 127 },
+        // Ogham,
+    { 78, 127 },
+        // Runic,
+    { 79, 127 },
+        // Nko,
+    { 14, 127 },
+};
+
+QSupportedWritingSystems QBasicFontDatabase::determineWritingSystemsFromTrueTypeBits(quint32 unicodeRange[4], quint32 codePageRange[2])
+{
+    QSupportedWritingSystems writingSystems;
+    bool hasScript = false;
+
+    int i;
+    for(i = 0; i < QFontDatabase::WritingSystemsCount; i++) {
+        int bit = requiredUnicodeBits[i][0];
+        int index = bit/32;
+        int flag =  1 << (bit&31);
+        if (bit != 126 && unicodeRange[index] & flag) {
+            bit = requiredUnicodeBits[i][1];
+            index = bit/32;
+
+            flag =  1 << (bit&31);
+            if (bit == 127 || unicodeRange[index] & flag) {
+                writingSystems.setSupported(QFontDatabase::WritingSystem(i));
+                hasScript = true;
+                // qDebug("font %s: index=%d, flag=%8x supports script %d", familyName.latin1(), index, flag, i);
+            }
+        }
+    }
+    if(codePageRange[0] & (1 << SimplifiedChineseCsbBit)) {
+        writingSystems.setSupported(QFontDatabase::SimplifiedChinese);
+        hasScript = true;
+        //qDebug("font %s supports Simplified Chinese", familyName.latin1());
+    }
+    if(codePageRange[0] & (1 << TraditionalChineseCsbBit)) {
+        writingSystems.setSupported(QFontDatabase::TraditionalChinese);
+        hasScript = true;
+        //qDebug("font %s supports Traditional Chinese", familyName.latin1());
+    }
+    if(codePageRange[0] & (1 << JapaneseCsbBit)) {
+        writingSystems.setSupported(QFontDatabase::Japanese);
+        hasScript = true;
+        //qDebug("font %s supports Japanese", familyName.latin1());
+    }
+    if(codePageRange[0] & (1 << KoreanCsbBit)) {
+        writingSystems.setSupported(QFontDatabase::Korean);
+        hasScript = true;
+        //qDebug("font %s supports Korean", familyName.latin1());
+    }
+    if (!hasScript)
+        writingSystems.setSupported(QFontDatabase::Symbol);
+
+    return writingSystems;
+}
+
+static inline bool scriptRequiresOpenType(int script)
+{
+    return ((script >= QUnicodeTables::Syriac && script <= QUnicodeTables::Sinhala)
+            || script == QUnicodeTables::Khmer || script == QUnicodeTables::Nko);
+}
+
+void QBasicFontDatabase::populateFontDatabase()
+{
+    QPlatformFontDatabase::populateFontDatabase();
+    QString fontpath = fontDir();
+
+    if(!QFile::exists(fontpath)) {
+        qFatal("QFontDatabase: Cannot find font directory %s - is Qt installed correctly?",
+               qPrintable(fontpath));
+    }
+
+    QDir dir(fontpath);
+    dir.setNameFilters(QStringList() << QLatin1String("*.ttf")
+                       << QLatin1String("*.ttc") << QLatin1String("*.pfa")
+                       << QLatin1String("*.pfb"));
+    dir.refresh();
+    for (int i = 0; i < int(dir.count()); ++i) {
+        const QByteArray file = QFile::encodeName(dir.absoluteFilePath(dir[i]));
+//        qDebug() << "looking at" << file;
+        addTTFile(QByteArray(), file);
+    }
+}
+
+QFontEngine *QBasicFontDatabase::fontEngine(const QFontDef &fontDef, QUnicodeTables::Script script, void *usrPtr)
+{
+    QFontEngineFT *engine;
+    FontFile *fontfile = static_cast<FontFile *> (usrPtr);
+    QFontEngine::FaceId fid;
+    fid.filename = fontfile->fileName.toLocal8Bit();
+    fid.index = fontfile->indexValue;
+    engine = new QFontEngineFT(fontDef);
+
+    bool antialias = !(fontDef.styleStrategy & QFont::NoAntialias);
+    QFontEngineFT::GlyphFormat format = antialias? QFontEngineFT::Format_A8 : QFontEngineFT::Format_Mono;
+    if (!engine->init(fid,antialias,format)) {
+        delete engine;
+        engine = 0;
+        return engine;
+    }
+    if (engine->invalid()) {
+        delete engine;
+        engine = 0;
+    } else if (scriptRequiresOpenType(script)) {
+        HB_Face hbFace = engine->harfbuzzFace();
+        if (!hbFace || !hbFace->supported_scripts[script]) {
+            delete engine;
+            engine = 0;
+        }
+    }
+
+    return engine;
+}
+
+namespace {
+
+    class QFontEngineFTRawData: public QFontEngineFT
+    {
+    public:
+        QFontEngineFTRawData(const QFontDef &fontDef) : QFontEngineFT(fontDef)
+        {
+        }
+
+        void updateFamilyNameAndStyle()
+        {
+            fontDef.family = QString::fromAscii(freetype->face->family_name);
+
+            if (freetype->face->style_flags & FT_STYLE_FLAG_ITALIC)
+                fontDef.style = QFont::StyleItalic;
+
+            if (freetype->face->style_flags & FT_STYLE_FLAG_BOLD)
+                fontDef.weight = QFont::Bold;
+        }
+
+        bool initFromData(const QByteArray &fontData)
+        {
+            FaceId faceId;
+            faceId.filename = "";
+            faceId.index = 0;
+            faceId.uuid = QUuid::createUuid().toByteArray();
+
+            return init(faceId, true, Format_None, fontData);
+        }
+    };
+
+}
+
+QFontEngine *QBasicFontDatabase::fontEngine(const QByteArray &fontData, qreal pixelSize,
+                                                QFont::HintingPreference hintingPreference)
+{
+    QFontDef fontDef;
+    fontDef.pixelSize = pixelSize;
+
+    QFontEngineFTRawData *fe = new QFontEngineFTRawData(fontDef);
+    if (!fe->initFromData(fontData)) {
+        delete fe;
+        return 0;
+    }
+
+    fe->updateFamilyNameAndStyle();
+
+    switch (hintingPreference) {
+    case QFont::PreferNoHinting:
+        fe->setDefaultHintStyle(QFontEngineFT::HintNone);
+        break;
+    case QFont::PreferFullHinting:
+        fe->setDefaultHintStyle(QFontEngineFT::HintFull);
+        break;
+    case QFont::PreferVerticalHinting:
+        fe->setDefaultHintStyle(QFontEngineFT::HintLight);
+        break;
+    default:
+        // Leave it as it is
+        break;
+    }
+
+    return fe;
+}
+
+QStringList QBasicFontDatabase::fallbacksForFamily(const QString family, const QFont::Style &style, const QFont::StyleHint &styleHint, const QUnicodeTables::Script &script) const
+{
+    Q_UNUSED(family);
+    Q_UNUSED(style);
+    Q_UNUSED(script);
+    Q_UNUSED(styleHint);
+    return QStringList();
+}
+
+QStringList QBasicFontDatabase::addApplicationFont(const QByteArray &fontData, const QString &fileName)
+{
+    return addTTFile(fontData,fileName.toLocal8Bit());
+}
+
+void QBasicFontDatabase::releaseHandle(void *handle)
+{
+    FontFile *file = static_cast<FontFile *>(handle);
+    delete file;
+}
+
+QStringList QBasicFontDatabase::addTTFile(const QByteArray &fontData, const QByteArray &file)
+{
+    extern FT_Library qt_getFreetype();
+    FT_Library library = qt_getFreetype();
+
+    int index = 0;
+    int numFaces = 0;
+    QStringList families;
+    do {
+        FT_Face face;
+        FT_Error error;
+        if (!fontData.isEmpty()) {
+            error = FT_New_Memory_Face(library, (const FT_Byte *)fontData.constData(), fontData.size(), index, &face);
+        } else {
+            error = FT_New_Face(library, file.constData(), index, &face);
+        }
+        if (error != FT_Err_Ok) {
+            qDebug() << "FT_New_Face failed with index" << index << ":" << hex << error;
+            break;
+        }
+        numFaces = face->num_faces;
+
+        QFont::Weight weight = QFont::Normal;
+
+        QFont::Style style = QFont::StyleNormal;
+        if (face->style_flags & FT_STYLE_FLAG_ITALIC)
+            style = QFont::StyleItalic;
+
+        if (face->style_flags & FT_STYLE_FLAG_BOLD)
+            weight = QFont::Bold;
+
+        bool fixedPitch = (face->face_flags & FT_FACE_FLAG_FIXED_WIDTH);
+
+        QSupportedWritingSystems writingSystems;
+        // detect symbol fonts
+        for (int i = 0; i < face->num_charmaps; ++i) {
+            FT_CharMap cm = face->charmaps[i];
+            if (cm->encoding == ft_encoding_adobe_custom
+                    || cm->encoding == ft_encoding_symbol) {
+                writingSystems.setSupported(QFontDatabase::Symbol);
+                break;
+            }
+        }
+
+        TT_OS2 *os2 = (TT_OS2 *)FT_Get_Sfnt_Table(face, ft_sfnt_os2);
+        if (os2) {
+            quint32 unicodeRange[4] = {
+                quint32(os2->ulUnicodeRange1),
+                quint32(os2->ulUnicodeRange2),
+                quint32(os2->ulUnicodeRange3),
+                quint32(os2->ulUnicodeRange4)
+            };
+            quint32 codePageRange[2] = {
+                quint32(os2->ulCodePageRange1),
+                quint32(os2->ulCodePageRange2)
+            };
+
+            writingSystems = determineWritingSystemsFromTrueTypeBits(unicodeRange, codePageRange);
+
+            if (os2->usWeightClass == 0)
+                ;
+            else if (os2->usWeightClass < 350)
+                weight = QFont::Light;
+            else if (os2->usWeightClass < 450)
+                weight = QFont::Normal;
+            else if (os2->usWeightClass < 650)
+                weight = QFont::DemiBold;
+            else if (os2->usWeightClass < 750)
+                weight = QFont::Bold;
+            else if (os2->usWeightClass < 1000)
+                weight = QFont::Black;
+
+            if (os2->panose[2] >= 2) {
+                int w = os2->panose[2];
+                if (w <= 3)
+                    weight = QFont::Light;
+                else if (w <= 5)
+                    weight = QFont::Normal;
+                else if (w <= 7)
+                    weight = QFont::DemiBold;
+                else if (w <= 8)
+                    weight = QFont::Bold;
+                else if (w <= 10)
+                    weight = QFont::Black;
+            }
+        }
+
+        QString family = QString::fromAscii(face->family_name);
+        FontFile *fontFile = new FontFile;
+        fontFile->fileName = QString::fromAscii(file);
+        fontFile->indexValue = index;
+
+        QFont::Stretch stretch = QFont::Unstretched;
+
+        registerFont(family,QString(),weight,style,stretch,true,true,0,fixedPitch,writingSystems,fontFile);
+
+        families.append(family);
+
+        FT_Done_Face(face);
+        ++index;
+    } while (index < numFaces);
+    return families;
+}