qfontdatabase_qws.cpp

奇趣公司比较新的qt/emd版本

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#include "qdir.h"
#include "qscreen_qws.h" //so we can check for rotation
#include "qwindowsystem_qws.h"
#include "qlibraryinfo.h"
#include "qabstractfileengine.h"
#include <QtCore/qsettings.h>
#if !defined(QT_NO_FREETYPE)
#include "qfontengine_ft_p.h"

#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_TRUETYPE_TABLES_H

#endif
#include "qfontengine_qpf_p.h"
#include "private/qfactoryloader_p.h"
#include "qabstractfontengine_qws.h"
#include "qabstractfontengine_p.h"
#include <qdatetime.h>

// for mmap
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <errno.h>

#ifndef QT_NO_LIBRARY
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
    (QFontEngineFactoryInterface_iid, QCoreApplication::libraryPaths(), QLatin1String("/fontengines"), Qt::CaseInsensitive))
#endif

const quint8 DatabaseVersion = 4;

void QFontDatabasePrivate::addFont(const QString &familyname, const char *foundryname, int weight, bool italic, int pixelSize,
                                   const QByteArray &file, int fileIndex, bool antialiased,
                                   const QList<QFontDatabase::WritingSystem> &writingSystems)
{
//    qDebug() << "Adding font" << familyname << weight << italic << pixelSize << file << fileIndex << antialiased;
    QtFontStyle::Key styleKey;
    styleKey.style = italic ? QFont::StyleItalic : QFont::StyleNormal;
    styleKey.weight = weight;
    styleKey.stretch = 100;
    QtFontFamily *f = family(familyname, true);

    if (writingSystems.isEmpty()) {
        for (int ws = 1; ws < QFontDatabase::WritingSystemsCount; ++ws) {
            f->writingSystems[ws] = QtFontFamily::Supported;
        }
        f->bogusWritingSystems = true;
    } else {
        for (int i = 0; i < writingSystems.count(); ++i) {
            f->writingSystems[writingSystems.at(i)] = QtFontFamily::Supported;
        }
    }

    QtFontFoundry *foundry = f->foundry(QString::fromLatin1(foundryname), true);
    QtFontStyle *style = foundry->style(styleKey,  true);
    style->smoothScalable = (pixelSize == 0);
    style->antialiased = antialiased;
    QtFontSize *size = style->pixelSize(pixelSize?pixelSize:SMOOTH_SCALABLE, true);
    size->fileName = file;
    size->fileIndex = fileIndex;

    if (stream) {
        *stream << familyname << foundry->name << weight << quint8(italic) << pixelSize
                << file << fileIndex << quint8(antialiased);
        *stream << quint8(writingSystems.count());
        for (int i = 0; i < writingSystems.count(); ++i)
            *stream << quint8(writingSystems.at(i));
    }
}

#ifndef QT_NO_QWS_QPF2
void QFontDatabasePrivate::addQPF2File(const QByteArray &file)
{
    struct stat st;
    if (stat(file.constData(), &st))
        return;
    int f = ::open(file, O_RDONLY);
    if (f < 0)
        return;
    const uchar *data = (const uchar *)mmap(0, st.st_size, PROT_READ, MAP_SHARED, f, 0);
    if (data && data != (const uchar *)MAP_FAILED) {
        if (QFontEngineQPF::verifyHeader(data, st.st_size)) {
            QString fontName = QFontEngineQPF::extractHeaderField(data, QFontEngineQPF::Tag_FontName).toString();
            int pixelSize = QFontEngineQPF::extractHeaderField(data, QFontEngineQPF::Tag_PixelSize).toInt();
            QVariant weight = QFontEngineQPF::extractHeaderField(data, QFontEngineQPF::Tag_Weight);
            QVariant style = QFontEngineQPF::extractHeaderField(data, QFontEngineQPF::Tag_Style);
            QByteArray writingSystemBits = QFontEngineQPF::extractHeaderField(data, QFontEngineQPF::Tag_WritingSystems).toByteArray();

            if (!fontName.isEmpty() && pixelSize) {
                int fontWeight = 50;
                if (weight.type() == QVariant::Int)
                    fontWeight = weight.toInt();
                else if (weight.type() == QVariant::UInt)
                    fontWeight = (int)weight.toUInt();

                bool italic = static_cast<QFont::Style>(style.toInt()) & QFont::StyleItalic;

                QList<QFontDatabase::WritingSystem> writingSystems;
                for (int i = 0; i < writingSystemBits.count(); ++i) {
                    uchar currentByte = writingSystemBits.at(i);
                    for (int j = 0; j < 8; ++j) {
                        if (currentByte & 1)
                            writingSystems << QFontDatabase::WritingSystem(i * 8 + j);
                        currentByte >>= 1;
                    }
                }

                addFont(fontName, /*foundry*/ "prerendered", fontWeight, italic,
                        pixelSize, file, /*fileIndex*/ 0,
                        /*antialiased*/ true, writingSystems);
            }
        } else {
            qDebug() << "header verification of QPF2 font" << file << "failed. maybe it is corrupt?";
        }
        munmap((void *)data, st.st_size);
    }
    ::close(f);
}
#endif

#ifndef QT_NO_FREETYPE
QStringList QFontDatabasePrivate::addTTFile(const QByteArray &file, const QByteArray &fontData)
{
    QStringList families;
    extern FT_Library qt_getFreetype();
    FT_Library library = qt_getFreetype();

    int index = 0;
    int numFaces = 0;
    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, index, &face);
        }
        if (error != FT_Err_Ok) {
            qDebug() << "FT_New_Face failed with index" << index << ":" << hex << error;
            break;
        }
        numFaces = face->num_faces;

        int weight = QFont::Normal;
        bool italic = face->style_flags & FT_STYLE_FLAG_ITALIC;

        if (face->style_flags & FT_STYLE_FLAG_BOLD)
            weight = QFont::Bold;

        QList<QFontDatabase::WritingSystem> 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.append(QFontDatabase::Symbol);
                break;
            }
        }
        if (writingSystems.isEmpty()) {
            TT_OS2 *os2 = (TT_OS2 *)FT_Get_Sfnt_Table(face, ft_sfnt_os2);
            if (os2) {
                quint32 unicodeRange[4] = {
                    os2->ulUnicodeRange1, os2->ulUnicodeRange2, os2->ulUnicodeRange3, os2->ulUnicodeRange4
                };
                quint32 codePageRange[2] = {
                    os2->ulCodePageRange1, os2->ulCodePageRange2
                };

                writingSystems = determineWritingSystemsFromTrueTypeBits(unicodeRange, codePageRange);
                //for (int i = 0; i < writingSystems.count(); ++i)
                //    qDebug() << QFontDatabase::writingSystemName(writingSystems.at(i));
            }
        }

        QString family = QString::fromAscii(face->family_name);
        families.append(family);
        addFont(family, /*foundry*/ "", weight, italic,
                /*pixelsize*/ 0, file, index, /*antialias*/ true, writingSystems);

        FT_Done_Face(face);
        ++index;
    } while (index < numFaces);
    return families;
}
#endif

static void registerFont(QFontDatabasePrivate::ApplicationFont *fnt);

extern QString qws_fontCacheDir();

bool QFontDatabasePrivate::loadFromCache(const QString &fontPath)
{
    const bool weAreTheServer = QWSServer::instance();

    QString fontDirFile = fontPath + QLatin1String("/fontdir");

    QFile binaryDb(qws_fontCacheDir() + QLatin1String("/fontdb"));

    if (weAreTheServer) {
        QDateTime dbTimeStamp = QFileInfo(binaryDb.fileName()).lastModified();

        QDateTime fontPathTimeStamp = QFileInfo(fontPath).lastModified();
        if (dbTimeStamp < fontPathTimeStamp)
            return false; // let the caller create the cache

        if (QFile::exists(fontDirFile)) {
            QDateTime fontDirTimeStamp = QFileInfo(fontDirFile).lastModified();
            if (dbTimeStamp < fontDirTimeStamp)
                return false;
        }
    }

    if (!binaryDb.open(QIODevice::ReadOnly)) {
        if (weAreTheServer)
            return false; // let the caller create the cache
        qFatal("QFontDatabase::loadFromCache: Could not open font database cache!");
    }

    QDataStream stream(&binaryDb);
    quint8 version = 0;
    quint8 dataStreamVersion = 0;
    stream >> version >> dataStreamVersion;
    if (version != DatabaseVersion || dataStreamVersion != stream.version()) {
        if (weAreTheServer)
            return false; // let the caller create the cache
        qFatal("QFontDatabase::loadFromCache: Wrong version of the font database cache detected. Found %d/%d expected %d/%d",
               version, dataStreamVersion, DatabaseVersion, stream.version());
    }

    QString originalFontPath;
    stream >> originalFontPath;
    if (originalFontPath != fontPath) {
        if (weAreTheServer)
            return false; // let the caller create the cache
        qFatal("QFontDatabase::loadFromCache: Font path doesn't match. Found %s in database, expected %s", qPrintable(originalFontPath), qPrintable(fontPath));
    }

    QString familyname;
    stream >> familyname;
    //qDebug() << "populating database from" << binaryDb.fileName();
    while (!familyname.isEmpty() && !stream.atEnd()) {
        QString foundryname;
        int weight;
        quint8 italic;
        int pixelSize;
        QByteArray file;
        int fileIndex;
        quint8 antialiased;
        quint8 writingSystemCount;

        QList<QFontDatabase::WritingSystem> writingSystems;

        stream >> foundryname >> weight >> italic >> pixelSize
               >> file >> fileIndex >> antialiased >> writingSystemCount;

        for (quint8 i = 0; i < writingSystemCount; ++i) {
            quint8 ws;
            stream >> ws;
            writingSystems.append(QFontDatabase::WritingSystem(ws));
        }

        addFont(familyname, foundryname.toLatin1().constData(), weight, italic, pixelSize, file, fileIndex, antialiased,
                writingSystems);

        stream >> familyname;
    }

    stream >> fallbackFamilies;
    //qDebug() << "fallback families from cache:" << fallbackFamilies;
    return true;
}

/*!
    \internal
*/

static QString qwsFontPath()
{
    QString fontpath = QString::fromLocal8Bit(qgetenv("QT_QWS_FONTDIR"));
    if (fontpath.isEmpty()) {
#ifndef QT_NO_SETTINGS
        fontpath = QLibraryInfo::location(QLibraryInfo::LibrariesPath);
        fontpath += QLatin1String("/fonts");