path: root/src/gui/text/qfontdatabase_s60.cpp

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#include <private/qapplication_p.h>
#include "qdir.h"
#include "qfont_p.h"
#include "qfontengine_s60_p.h"
#include "qabstractfileengine.h"
#include "qdesktopservices.h"
#include "qtemporaryfile.h"
#include <private/qpixmap_s60_p.h>
#include <private/qt_s60_p.h>
#include "qendian.h"
#include <private/qcore_symbian_p.h>
#ifdef QT_NO_FREETYPE
#include <openfont.h>
#ifdef SYMBIAN_ENABLE_SPLIT_HEADERS
#include <graphics/openfontrasterizer.h> // COpenFontRasterizer has moved to a new header file
#endif // SYMBIAN_ENABLE_SPLIT_HEADERS
#endif // QT_NO_FREETYPE

QT_BEGIN_NAMESPACE

QStringList qt_symbian_fontFamiliesOnFontServer() // Also used in qfont_s60.cpp
{
    QStringList result;
    QSymbianFbsHeapLock lock(QSymbianFbsHeapLock::Unlock);
    const int numTypeFaces = S60->screenDevice()->NumTypefaces();
    for (int i = 0; i < numTypeFaces; i++) {
        TTypefaceSupport typefaceSupport;
        S60->screenDevice()->TypefaceSupport(typefaceSupport, i);
        const QString familyName((const QChar *)typefaceSupport.iTypeface.iName.Ptr(), typefaceSupport.iTypeface.iName.Length());
        result.append(familyName);
    }
    lock.relock();
    return result;
}

QFileInfoList alternativeFilePaths(const QString &path, const QStringList &nameFilters,
    QDir::Filters filters = QDir::NoFilter, QDir::SortFlags sort = QDir::NoSort,
    bool uniqueFileNames = true)
{
    QFileInfoList result;

    // Prepare a 'soft to hard' drive list: W:, X: ... A:, Z:
    QStringList driveStrings;
    foreach (const QFileInfo &drive, QDir::drives())
        driveStrings.append(drive.absolutePath());
    driveStrings.sort();
    const QString zDriveString(QLatin1String("Z:/"));
    driveStrings.removeAll(zDriveString);
    driveStrings.prepend(zDriveString);

    QStringList uniqueFileNameList;
    for (int i = driveStrings.count() - 1; i >= 0; --i) {
        const QDir dirOnDrive(driveStrings.at(i) + path);
        const QFileInfoList entriesOnDrive = dirOnDrive.entryInfoList(nameFilters, filters, sort);
        if (uniqueFileNames) {
            foreach(const QFileInfo &entry, entriesOnDrive) {
                if (!uniqueFileNameList.contains(entry.fileName())) {
                    uniqueFileNameList.append(entry.fileName());
                    result.append(entry);
                }
            }
        } else {
            result.append(entriesOnDrive);
        }
    }
    return result;
}

#ifdef QT_NO_FREETYPE
class QSymbianFontDatabaseExtrasImplementation : public QSymbianFontDatabaseExtras
{
public:
    QSymbianFontDatabaseExtrasImplementation();
    ~QSymbianFontDatabaseExtrasImplementation();

    const QSymbianTypeFaceExtras *extras(const QString &typeface, bool bold, bool italic) const;
    void removeAppFontData(QFontDatabasePrivate::ApplicationFont *fnt);
    static inline bool appFontLimitReached();
    TUid addFontFileToFontStore(const QFileInfo &fontFileInfo);
    static void clear();

    static inline QString tempAppFontFolder();
    static const QString appFontMarkerPrefix;
    static QString appFontMarker(); // 'qaf<shortUid[+shortPid]>'

    struct CFontFromFontStoreReleaser {
        static inline void cleanup(CFont *font)
        {
            if (!font)
                return;
            const QSymbianFontDatabaseExtrasImplementation *dbExtras =
                    static_cast<const QSymbianFontDatabaseExtrasImplementation*>(privateDb()->symbianExtras);
            dbExtras->m_store->ReleaseFont(font);
        }
    };

    struct CFontFromScreenDeviceReleaser {
        static inline void cleanup(CFont *font)
        {
            if (!font)
                return;
            S60->screenDevice()->ReleaseFont(font);
        }
    };

// m_heap, m_store, m_rasterizer and m_extras are used if Symbian
// does not provide the Font Table API
    RHeap* m_heap;
    CFontStore *m_store;
    COpenFontRasterizer *m_rasterizer;
    mutable QList<const QSymbianTypeFaceExtras *> m_extras;

    mutable QHash<QString, const QSymbianTypeFaceExtras *> m_extrasHash;
};

const QString QSymbianFontDatabaseExtrasImplementation::appFontMarkerPrefix =
        QLatin1String("qaf");

inline QString QSymbianFontDatabaseExtrasImplementation::tempAppFontFolder()
{
    return QDir::toNativeSeparators(QDir::tempPath()) + QLatin1Char('\\');
}

QString QSymbianFontDatabaseExtrasImplementation::appFontMarker()
{
    static QString result;
    if (result.isEmpty()) {
        const quint32 uid = RProcess().Type().MostDerived().iUid;
        quint16 crossSum = static_cast<quint16>(uid + (uid >> 16));
        if (!QSymbianTypeFaceExtras::symbianFontTableApiAvailable()) {
            // If no font table Api is available, we must not even load a font
            // from a previous (crashed) run of this application. Reason: we
            // won't get the font tables, they are not in the CFontStore.
            // So, we add the pid to the uniqueness of the marker.
            const quint32 pid = static_cast<quint32>(RProcess().Id().Id());
            crossSum += static_cast<quint16>(pid + (pid >> 16));
        }
        result = appFontMarkerPrefix + QString::number(crossSum, 16);
    }
    return result;
}

QSymbianFontDatabaseExtrasImplementation::QSymbianFontDatabaseExtrasImplementation()
{
    if (!QSymbianTypeFaceExtras::symbianFontTableApiAvailable()) {
        QStringList filters;
        filters.append(QLatin1String("*.ttf"));
        filters.append(QLatin1String("*.ccc"));
        filters.append(QLatin1String("*.ltt"));
        const QFileInfoList fontFiles = alternativeFilePaths(QLatin1String("resource\\Fonts"), filters);

        const TInt heapMinLength = 0x1000;
        const TInt heapMaxLength = qMax(0x20000 * fontFiles.count(), heapMinLength);
        m_heap = User::ChunkHeap(NULL, heapMinLength, heapMaxLength);
        QT_TRAP_THROWING(
            m_store = CFontStore::NewL(m_heap);
            m_rasterizer = COpenFontRasterizer::NewL(TUid::Uid(0x101F7F5E));
            CleanupStack::PushL(m_rasterizer);
            m_store->InstallRasterizerL(m_rasterizer);
            CleanupStack::Pop(m_rasterizer););

        foreach (const QFileInfo &fontFileInfo, fontFiles)
            addFontFileToFontStore(fontFileInfo);
    }
}

void QSymbianFontDatabaseExtrasImplementation::clear()
{
    QFontDatabasePrivate *db = privateDb();
    if (!db)
        return;
    const QSymbianFontDatabaseExtrasImplementation *dbExtras =
            static_cast<const QSymbianFontDatabaseExtrasImplementation*>(db->symbianExtras);
    if (!dbExtras)
        return; // initializeDb() has never been called
    if (QSymbianTypeFaceExtras::symbianFontTableApiAvailable()) {
        qDeleteAll(dbExtras->m_extrasHash);
    } else {
        typedef QList<const QSymbianTypeFaceExtras *>::iterator iterator;
        for (iterator p = dbExtras->m_extras.begin(); p != dbExtras->m_extras.end(); ++p) {
            dbExtras->m_store->ReleaseFont((*p)->fontOwner());
            delete *p;
        }
        dbExtras->m_extras.clear();
    }
    dbExtras->m_extrasHash.clear();
}

void qt_cleanup_symbianFontDatabase()
{
    QFontDatabasePrivate *db = privateDb();
    if (!db)
        return;

    QSymbianFontDatabaseExtrasImplementation::clear();

    if (!db->applicationFonts.isEmpty()) {
        QFontDatabase::removeAllApplicationFonts();
        // We remove the left over temporary font files of Qt application.
        // Active fonts are undeletable since the font server holds a handle
        // on them, so we do not need to worry to delete other running
        // applications' fonts.
        const QDir dir(QSymbianFontDatabaseExtrasImplementation::tempAppFontFolder());
        const QStringList filter(
                QSymbianFontDatabaseExtrasImplementation::appFontMarkerPrefix + QLatin1String("*.ttf"));
        foreach (const QFileInfo &ttfFile, dir.entryInfoList(filter))
            QFile(ttfFile.absoluteFilePath()).remove();
        db->applicationFonts.clear();
    }
}

QSymbianFontDatabaseExtrasImplementation::~QSymbianFontDatabaseExtrasImplementation()
{
    qt_cleanup_symbianFontDatabase();
    if (!QSymbianTypeFaceExtras::symbianFontTableApiAvailable()) {
        delete m_store;
        m_heap->Close();
    }
}

#ifndef FNTSTORE_H_INLINES_SUPPORT_FMM
/*
 Workaround: fntstore.h has an inlined function 'COpenFont* CBitmapFont::OpenFont()'
 that returns a private data member. The header will change between SDKs. But Qt has
 to build on any SDK version and run on other versions of Symbian OS.
 This function performs the needed pointer arithmetic to get the right COpenFont*
*/
COpenFont* OpenFontFromBitmapFont(const CBitmapFont* aBitmapFont)
{
    const TInt offsetIOpenFont = 92; // '_FOFF(CBitmapFont, iOpenFont)' ..if iOpenFont weren't private
    const TUint valueIOpenFont = *(TUint*)PtrAdd(aBitmapFont, offsetIOpenFont);
    return (valueIOpenFont & 1) ?
            (COpenFont*)PtrAdd(aBitmapFont, valueIOpenFont & ~1) : // New behavior: iOpenFont is offset
            (COpenFont*)valueIOpenFont; // Old behavior: iOpenFont is pointer
}
#endif // FNTSTORE_H_INLINES_SUPPORT_FMM

const QSymbianTypeFaceExtras *QSymbianFontDatabaseExtrasImplementation::extras(const QString &typeface,
                                                                               bool bold, bool italic) const
{
    const QString searchKey = typeface + QString::number(int(bold)) + QString::number(int(italic));
    if (!m_extrasHash.contains(searchKey)) {
        TFontSpec searchSpec(qt_QString2TPtrC(typeface), 1);
        if (bold)
            searchSpec.iFontStyle.SetStrokeWeight(EStrokeWeightBold);
        if (italic)
            searchSpec.iFontStyle.SetPosture(EPostureItalic);

        CFont* font = NULL;
        if (QSymbianTypeFaceExtras::symbianFontTableApiAvailable()) {
            const TInt err = S60->screenDevice()->GetNearestFontToDesignHeightInPixels(font, searchSpec);
            Q_ASSERT(err == KErrNone && font);
            QScopedPointer<CFont, CFontFromScreenDeviceReleaser> sFont(font);
            QSymbianTypeFaceExtras *extras = new QSymbianTypeFaceExtras(font);
            sFont.take();
            m_extrasHash.insert(searchKey, extras);
        } else {
            const TInt err = m_store->GetNearestFontToDesignHeightInPixels(font, searchSpec);
            Q_ASSERT(err == KErrNone && font);
            const CBitmapFont *bitmapFont = static_cast<CBitmapFont*>(font);
            COpenFont *openFont =
#ifdef FNTSTORE_H_INLINES_SUPPORT_FMM
                bitmapFont->OpenFont();
#else // FNTSTORE_H_INLINES_SUPPORT_FMM
                OpenFontFromBitmapFont(bitmapFont);
#endif // FNTSTORE_H_INLINES_SUPPORT_FMM
            const TOpenFontFaceAttrib* const attrib = openFont->FaceAttrib();
            const QString foundKey =
                    QString((const QChar*)attrib->FullName().Ptr(), attrib->FullName().Length());
            if (!m_extrasHash.contains(foundKey)) {
                QScopedPointer<CFont, CFontFromFontStoreReleaser> sFont(font);
                QSymbianTypeFaceExtras *extras = new QSymbianTypeFaceExtras(font, openFont);
                sFont.take();
                m_extras.append(extras);
                m_extrasHash.insert(searchKey, extras);
                m_extrasHash.insert(foundKey, extras);
            } else {
                m_store->ReleaseFont(font);
                m_extrasHash.insert(searchKey, m_extrasHash.value(foundKey));
            }
        }
    }
    return m_extrasHash.value(searchKey);
}

void QSymbianFontDatabaseExtrasImplementation::removeAppFontData(
    QFontDatabasePrivate::ApplicationFont *fnt)
{
    clear();
    if (!QSymbianTypeFaceExtras::symbianFontTableApiAvailable()
            && fnt->fontStoreFontFileUid.iUid != 0)
        m_store->RemoveFile(fnt->fontStoreFontFileUid);
    if (fnt->screenDeviceFontFileId != 0)
        S60->screenDevice()->RemoveFile(fnt->screenDeviceFontFileId);
    QFile::remove(fnt->temporaryFileName);
    *fnt = QFontDatabasePrivate::ApplicationFont();
}

bool QSymbianFontDatabaseExtrasImplementation::appFontLimitReached()
{
    QFontDatabasePrivate *db = privateDb();
    if (!db)
        return false;
    const int maxAppFonts = 5;
    int registeredAppFonts = 0;
    foreach (const QFontDatabasePrivate::ApplicationFont &appFont, db->applicationFonts)
        if (!appFont.families.isEmpty() && ++registeredAppFonts == maxAppFonts)
            return true;
    return false;
}

TUid QSymbianFontDatabaseExtrasImplementation::addFontFileToFontStore(const QFileInfo &fontFileInfo)
{
    Q_ASSERT(!QSymbianTypeFaceExtras::symbianFontTableApiAvailable());
    const QString fontFile = QDir::toNativeSeparators(fontFileInfo.absoluteFilePath());
    const TPtrC fontFilePtr(qt_QString2TPtrC(fontFile));
    TUid fontUid = {0};
    TRAP_IGNORE(fontUid = m_store->AddFileL(fontFilePtr));
    return fontUid;
}

#else // QT_NO_FREETYPE
class QFontEngineFTS60 : public QFontEngineFT
{
public:
    QFontEngineFTS60(const QFontDef &fd);
};

QFontEngineFTS60::QFontEngineFTS60(const QFontDef &fd)
    : QFontEngineFT(fd)
{
    default_hint_style = HintFull;
}
#endif // QT_NO_FREETYPE

/*
 QFontEngineS60::pixelsToPoints, QFontEngineS60::pointsToPixels, QFontEngineMultiS60::QFontEngineMultiS60
 and QFontEngineMultiS60::QFontEngineMultiS60 should be in qfontengine_s60.cpp. But since also the
 Freetype based font rendering need them, they are here.
*/
qreal QFontEngineS60::pixelsToPoints(qreal pixels, Qt::Orientation orientation)
{
    CWsScreenDevice* device = S60->screenDevice();
    return (orientation == Qt::Horizontal?
        device->HorizontalPixelsToTwips(pixels)
        :device->VerticalPixelsToTwips(pixels)) / KTwipsPerPoint;
}

qreal QFontEngineS60::pointsToPixels(qreal points, Qt::Orientation orientation)
{
    CWsScreenDevice* device = S60->screenDevice();
    const int twips = points * KTwipsPerPoint;
    return orientation == Qt::Horizontal?
        device->HorizontalTwipsToPixels(twips)
        :device->VerticalTwipsToPixels(twips);
}

QFontEngineMultiS60::QFontEngineMultiS60(QFontEngine *first, int script, const QStringList &fallbackFamilies)
    : QFontEngineMulti(fallbackFamilies.size() + 1)
    , m_script(script)
    , m_fallbackFamilies(fallbackFamilies)
{
    engines[0] = first;
    first->ref.ref();
    fontDef = engines[0]->fontDef;
}

void QFontEngineMultiS60::loadEngine(int at)
{
    Q_ASSERT(at < engines.size());
    Q_ASSERT(engines.at(at) == 0);

    QFontDef request = fontDef;
    request.styleStrategy |= QFont::NoFontMerging;
    request.family = m_fallbackFamilies.at(at-1);
    engines[at] = QFontDatabase::findFont(m_script,
                                          /*fontprivate*/0,
                                          request);
    Q_ASSERT(engines[at]);
}

static bool registerScreenDeviceFont(int screenDeviceFontIndex,
                                     const QSymbianFontDatabaseExtrasImplementation *dbExtras)
{
    TTypefaceSupport typefaceSupport;
        S60->screenDevice()->TypefaceSupport(typefaceSupport, screenDeviceFontIndex);
    CFont *font; // We have to get a font instance in order to know all the details
    TFontSpec fontSpec(typefaceSupport.iTypeface.iName, 11);
    if (S60->screenDevice()->GetNearestFontInPixels(font, fontSpec) != KErrNone)
        return false;
    QScopedPointer<CFont, QSymbianFontDatabaseExtrasImplementation::CFontFromScreenDeviceReleaser> sFont(font);
    if (font->TypeUid() != KCFbsFontUid)
        return false;
    TOpenFontFaceAttrib faceAttrib;
    const CFbsFont *cfbsFont = static_cast<const CFbsFont *>(font);
    cfbsFont->GetFaceAttrib(faceAttrib);

    QtFontStyle::Key styleKey;
    styleKey.style = faceAttrib.IsItalic()?QFont::StyleItalic:QFont::StyleNormal;
    styleKey.weight = faceAttrib.IsBold()?QFont::Bold:QFont::Normal;

    QString familyName((const QChar *)typefaceSupport.iTypeface.iName.Ptr(), typefaceSupport.iTypeface.iName.Length());
    QtFontFamily *family = privateDb()->family(familyName, true);
    family->fixedPitch = faceAttrib.IsMonoWidth();
    QtFontFoundry *foundry = family->foundry(QString(), true);
    QtFontStyle *style = foundry->style(styleKey, true);
    style->smoothScalable = typefaceSupport.iIsScalable;
    style->pixelSize(0, true);

    const QSymbianTypeFaceExtras *typeFaceExtras =
            dbExtras->extras(familyName, faceAttrib.IsBold(), faceAttrib.IsItalic());
    const QByteArray os2Table = typeFaceExtras->getSfntTable(MAKE_TAG('O', 'S', '/', '2'));
    const unsigned char* data = reinterpret_cast<const unsigned char*>(os2Table.constData());
    const unsigned char* ulUnicodeRange = data + 42;
    quint32 unicodeRange[4] = {
        qFromBigEndian<quint32>(ulUnicodeRange),
        qFromBigEndian<quint32>(ulUnicodeRange + 4),
        qFromBigEndian<quint32>(ulUnicodeRange + 8),
        qFromBigEndian<quint32>(ulUnicodeRange + 12)
    };
    const unsigned char* ulCodePageRange = data + 78;
    quint32 codePageRange[2] = {
        qFromBigEndian<quint32>(ulCodePageRange),
        qFromBigEndian<quint32>(ulCodePageRange + 4)
    };
    const QList<QFontDatabase::WritingSystem> writingSystems =
        determineWritingSystemsFromTrueTypeBits(unicodeRange, codePageRange);
    foreach (const QFontDatabase::WritingSystem system, writingSystems)
        family->writingSystems[system] = QtFontFamily::Supported;
    return true;
}

static void initializeDb()
{
    QFontDatabasePrivate *db = privateDb();
    if(!db || db->count)
        return;

#ifdef QT_NO_FREETYPE
    if (!db->symbianExtras)
        db->symbianExtras = new QSymbianFontDatabaseExtrasImplementation;

    QSymbianFbsHeapLock lock(QSymbianFbsHeapLock::Unlock);

    const int numTypeFaces = S60->screenDevice()->NumTypefaces();
    const QSymbianFontDatabaseExtrasImplementation *dbExtras =
            static_cast<const QSymbianFontDatabaseExtrasImplementation*>(db->symbianExtras);
    for (int i = 0; i < numTypeFaces; i++)
        registerScreenDeviceFont(i, dbExtras);

    // We have to clear/release all CFonts, here, in case one of the fonts is
    // an application font of another running Qt app. Otherwise the other Qt app
    // cannot remove it's application font, anymore -> "Zombie Font".
    QSymbianFontDatabaseExtrasImplementation::clear();

    lock.relock();

#else // QT_NO_FREETYPE
    QDir dir(QDesktopServices::storageLocation(QDesktopServices::FontsLocation));
    dir.setNameFilters(QStringList() << QLatin1String("*.ttf")
                       << QLatin1String("*.ttc") << QLatin1String("*.pfa")
                       << QLatin1String("*.pfb"));
    for (int i = 0; i < int(dir.count()); ++i) {
        const QByteArray file = QFile::encodeName(dir.absoluteFilePath(dir[i]));
        db->addTTFile(file);
    }
#endif // QT_NO_FREETYPE
}

static inline void load(const QString &family = QString(), int script = -1)
{
    Q_UNUSED(family)
    Q_UNUSED(script)
    initializeDb();
}

static void registerFont(QFontDatabasePrivate::ApplicationFont *fnt)
{
    if (QSymbianFontDatabaseExtrasImplementation::appFontLimitReached())
        return;

    QFontDatabasePrivate *db = privateDb();
    if (!db)
        return;

    if (!db->count)
        initializeDb();

    if (fnt->data.isEmpty() && !fnt->fileName.endsWith(QLatin1String(".ttf"), Qt::CaseInsensitive))
        return; // Only buffer or .ttf
    QSymbianFontDatabaseExtrasImplementation *dbExtras =
            static_cast<QSymbianFontDatabaseExtrasImplementation*>(db->symbianExtras);
    if (!dbExtras)
        return;

    // The QTemporaryFile object being used in the following section must be
    // destructed before letting Symbian load the TTF file. Symbian would not
    // load it otherwise, because QTemporaryFile will still keep some handle
    // on it. The scope is used to reduce the life time of the QTemporaryFile.
    // In order to prevent other processes from modifying the file between the
    // moment where the QTemporaryFile is destructed and the file is loaded by
    // Symbian, we have a QFile "tempFileGuard" outside the scope which opens
    // the file in ReadOnly mode while the QTemporaryFile is still alive.
    QFile tempFileGuard;
    {
        QTemporaryFile tempfile(QSymbianFontDatabaseExtrasImplementation::tempAppFontFolder()
                                + QSymbianFontDatabaseExtrasImplementation::appFontMarker()
                                + QLatin1String("XXXXXX.ttf"));
        if (!tempfile.open())
            return;
        const QString tempFileName = QFileInfo(tempfile).canonicalFilePath();
        if (fnt->data.isEmpty()) {
            QFile sourceFile(fnt->fileName);
            if (!sourceFile.open(QIODevice::ReadOnly))
                return;
            fnt->data = sourceFile.readAll();
        }
        if (tempfile.write(fnt->data) == -1)
            return;
        tempfile.setAutoRemove(false);
        tempfile.close(); // Tempfile still keeps a file handle, forbidding write access
        tempFileGuard.setFileName(tempFileName);
        if (!tempFileGuard.open(QIODevice::ReadOnly))
            return;
        fnt->temporaryFileName = tempFileName;
    }

    const QString fullFileName = QDir::toNativeSeparators(fnt->temporaryFileName);
    QSymbianFbsHeapLock lock(QSymbianFbsHeapLock::Unlock);
    const QStringList fontsOnServerBefore = qt_symbian_fontFamiliesOnFontServer();
    const TInt err =
            S60->screenDevice()->AddFile(qt_QString2TPtrC(fullFileName), fnt->screenDeviceFontFileId);
    tempFileGuard.close(); // Did its job
    const QStringList fontsOnServerAfter = qt_symbian_fontFamiliesOnFontServer();
    if (err == KErrNone && fontsOnServerBefore.count() < fontsOnServerAfter.count()) { // Added to screen device?
        int fontOnServerIndex = fontsOnServerAfter.count() - 1;
        for (int i = 0; i < fontsOnServerBefore.count(); i++) {
            if (fontsOnServerBefore.at(i) != fontsOnServerAfter.at(i)) {
                fontOnServerIndex = i;
                break;
            }
        }

        // Must remove all font engines with their CFonts, first.
        QFontCache::instance()->clear();
        db->free();
        QSymbianFontDatabaseExtrasImplementation::clear();

        if (!QSymbianTypeFaceExtras::symbianFontTableApiAvailable())
            fnt->fontStoreFontFileUid = dbExtras->addFontFileToFontStore(QFileInfo(fullFileName));

        fnt->families.append(fontsOnServerAfter.at(fontOnServerIndex));
        if (!registerScreenDeviceFont(fontOnServerIndex, dbExtras))
            dbExtras->removeAppFontData(fnt);
    } else {
        QFile::remove(fnt->temporaryFileName);
        *fnt = QFontDatabasePrivate::ApplicationFont();
    }
    lock.relock();
}

bool QFontDatabase::removeApplicationFont(int handle)
{
    QMutexLocker locker(fontDatabaseMutex());

    QFontDatabasePrivate *db = privateDb();
    if (!db || handle < 0 || handle >= db->applicationFonts.count())
        return false;
    QSymbianFontDatabaseExtrasImplementation *dbExtras =
            static_cast<QSymbianFontDatabaseExtrasImplementation*>(db->symbianExtras);
    if (!dbExtras)
        return false;

    QFontDatabasePrivate::ApplicationFont *fnt = &db->applicationFonts[handle];
    if (fnt->families.isEmpty())
        return true; // Nothing to remove. Return peacefully.

    // Must remove all font engines with their CFonts, first
    QFontCache::instance()->clear();
    db->free();
    dbExtras->removeAppFontData(fnt);

    db->invalidate(); // This will just emit 'fontDatabaseChanged()'
    return true;
}

bool QFontDatabase::removeAllApplicationFonts()
{
    QMutexLocker locker(fontDatabaseMutex());

    const int applicationFontsCount = privateDb()->applicationFonts.count();
    for (int i = 0; i < applicationFontsCount; ++i)
        if (!removeApplicationFont(i))
            return false;
    return true;
}

bool QFontDatabase::supportsThreadedFontRendering()
{
    return false;
}

static
QFontDef cleanedFontDef(const QFontDef &req)
{
    QFontDef result = req;
    if (result.pixelSize <= 0) {
        result.pixelSize = QFontEngineS60::pointsToPixels(qMax(qreal(1.0), result.pointSize));
        result.pointSize = 0;
    }
    return result;
}

QFontEngine *QFontDatabase::findFont(int script, const QFontPrivate *d, const QFontDef &req)
{
    const QFontCache::Key key(cleanedFontDef(req), script);

    if (!privateDb()->count)
        initializeDb();

    QFontEngine *fe = QFontCache::instance()->findEngine(key);
    if (!fe) {
        // Making sure that fe->fontDef.family will be an existing font.
        initializeDb();
        QFontDatabasePrivate *db = privateDb();
        QtFontDesc desc;
        QList<int> blacklistedFamilies;
        match(script, req, req.family, QString(), -1, &desc, blacklistedFamilies);
        if (!desc.family) // falling back to application font
            desc.family = db->family(QApplication::font().defaultFamily());
        Q_ASSERT(desc.family);

        // Making sure that desc.family supports the requested script
        QtFontDesc mappedDesc;
        bool supportsScript = false;
        do {
            match(script, req, QString(), QString(), -1, &mappedDesc, blacklistedFamilies);
            if (mappedDesc.family == desc.family) {
                supportsScript = true;
                break;
            }
            blacklistedFamilies.append(mappedDesc.familyIndex);
        } while (mappedDesc.family);
        if (!supportsScript) {
            blacklistedFamilies.clear();
            match(script, req, QString(), QString(), -1, &mappedDesc, blacklistedFamilies);
            if (mappedDesc.family)
                desc = mappedDesc;
        }

        const QString fontFamily = desc.family->name;
        QFontDef request = req;
        request.family = fontFamily;
#ifdef QT_NO_FREETYPE
        const QSymbianFontDatabaseExtrasImplementation *dbExtras =
                static_cast<const QSymbianFontDatabaseExtrasImplementation*>(db->symbianExtras);
        const QSymbianTypeFaceExtras *typeFaceExtras =
                dbExtras->extras(fontFamily, request.weight > QFont::Normal, request.style != QFont::StyleNormal);

        // We need a valid pixelSize, e.g. for lineThickness()
        if (request.pixelSize < 0)
            request.pixelSize = request.pointSize * d->dpi / 72;

        fe = new QFontEngineS60(request, typeFaceExtras);
#else // QT_NO_FREETYPE
        Q_UNUSED(d)
        QFontEngine::FaceId faceId;
        const QtFontFamily * const reqQtFontFamily = db->family(fontFamily);
        faceId.filename = reqQtFontFamily->fontFilename;
        faceId.index = reqQtFontFamily->fontFileIndex;

        QFontEngineFTS60 *fte = new QFontEngineFTS60(cleanedFontDef(request));
        if (fte->init(faceId, true, QFontEngineFT::Format_A8))
            fe = fte;
        else
            delete fte;
#endif // QT_NO_FREETYPE

        Q_ASSERT(fe);
        if (script == QUnicodeTables::Common
            && !(req.styleStrategy & QFont::NoFontMerging)
            && !fe->symbol) {

            QStringList commonFonts;
            for (int ws = 1; ws < QFontDatabase::WritingSystemsCount; ++ws) {
                if (scriptForWritingSystem[ws] != script)
                    continue;
                for (int i = 0; i < db->count; ++i) {
                    if (db->families[i]->writingSystems[ws] & QtFontFamily::Supported)
                        commonFonts.append(db->families[i]->name);
                }
            }

            // Hack: Prioritize .ccc fonts
            const QString niceEastAsianFont(QLatin1String("Sans MT 936_S60"));
            if (commonFonts.removeAll(niceEastAsianFont) > 0)
                commonFonts.prepend(niceEastAsianFont);

            fe = new QFontEngineMultiS60(fe, script, commonFonts);
        }
    }
    fe->ref.ref();
    QFontCache::instance()->insertEngine(key, fe);
    return fe;
}

void QFontDatabase::load(const QFontPrivate *d, int script)
{
    QFontEngine *fe = 0;
    QFontDef req = d->request;

    if (!d->engineData) {
        const QFontCache::Key key(cleanedFontDef(req), script);
        getEngineData(d, key);
    }

    // the cached engineData could have already loaded the engine we want
    if (d->engineData->engines[script])
        fe = d->engineData->engines[script];

    if (!fe) {
        if (qt_enable_test_font && req.family == QLatin1String("__Qt__Box__Engine__")) {
            fe = new QTestFontEngine(req.pixelSize);
            fe->fontDef = req;
        } else {
            fe = findFont(script, d, req);
        }
        d->engineData->engines[script] = fe;
    }
}

QT_END_NAMESPACE