qfontdatabase.cpp

奇趣公司比较新的qt/emd版本

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#include <qdir.h>
#include "qfontdatabase.h"
#include "qdebug.h"
#include "qalgorithms.h"
#include "qapplication.h"
#include "qvarlengtharray.h" // here or earlier - workaround for VC++6
#include "private/qunicodetables_p.h"
#include "qfontengine_p.h"
#include "qopentype_p.h"

#ifdef Q_WS_X11
#include <locale.h>
#endif
#include <stdlib.h>
#include <limits.h>

// #define QFONTDATABASE_DEBUG
#ifdef QFONTDATABASE_DEBUG
#  define FD_DEBUG qDebug
#else
#  define FD_DEBUG if (false) qDebug
#endif

// #define FONT_MATCH_DEBUG
#ifdef FONT_MATCH_DEBUG
#  define FM_DEBUG qDebug
#else
#  define FM_DEBUG if (false) qDebug
#endif

#if defined(Q_CC_MSVC) && !defined(Q_CC_MSVC_NET)
#  define for if(0){}else for
#endif


extern int qt_defaultDpiY(); // in qfont.cpp

Q_GUI_EXPORT bool qt_enable_test_font = false;

static int getFontWeight(const QString &weightString)
{
    QString s = weightString.toLower();

    // Test in decreasing order of commonness
    if (s == QLatin1String("medium") ||
        s == QLatin1String("normal")
        || s.compare(qApp->translate("QFontDatabase", "Normal"), Qt::CaseInsensitive) == 0)
        return QFont::Normal;
    if (s == QLatin1String("bold")
        || s.compare(qApp->translate("QFontDatabase", "Bold"), Qt::CaseInsensitive) == 0)
        return QFont::Bold;
    if (s == QLatin1String("demibold") || s == QLatin1String("demi bold")
        || s.compare(qApp->translate("QFontDatabase", "Demi Bold"), Qt::CaseInsensitive) == 0)
        return QFont::DemiBold;
    if (s == QLatin1String("black")
        || s.compare(qApp->translate("QFontDatabase", "Black"), Qt::CaseInsensitive) == 0)
        return QFont::Black;
    if (s == QLatin1String("light"))
        return QFont::Light;

    if (s.contains(QLatin1String("bold"))
        || s.contains(qApp->translate("QFontDatabase", "Bold"), Qt::CaseInsensitive)) {
        if (s.contains(QLatin1String("demi"))
            || s.compare(qApp->translate("QFontDatabase", "Demi"), Qt::CaseInsensitive) == 0)
            return (int) QFont::DemiBold;
        return (int) QFont::Bold;
    }

    if (s.contains(QLatin1String("light"))
        || s.compare(qApp->translate("QFontDatabase", "Light"), Qt::CaseInsensitive) == 0)
        return (int) QFont::Light;

    if (s.contains(QLatin1String("black"))
        || s.compare(qApp->translate("QFontDatabase", "Black"), Qt::CaseInsensitive) == 0)
        return (int) QFont::Black;

    return (int) QFont::Normal;
}

struct QtFontEncoding
{
    signed int encoding : 16;

    uint xpoint   : 16;
    uint xres     : 8;
    uint yres     : 8;
    uint avgwidth : 16;
    uchar pitch   : 8;
};

struct QtFontSize
{
    unsigned short pixelSize;

#ifdef Q_WS_X11
    int count;
    QtFontEncoding *encodings;
    QtFontEncoding *encodingID(int id, uint xpoint = 0, uint xres = 0,
                                uint yres = 0, uint avgwidth = 0, bool add = false);
#endif // Q_WS_X11
#ifdef Q_WS_QWS
    QByteArray fileName;
    int fileIndex;
#endif
};


#ifdef Q_WS_X11
QtFontEncoding *QtFontSize::encodingID(int id, uint xpoint, uint xres,
                                        uint yres, uint avgwidth, bool add)
{
    // we don't match using the xpoint, xres and yres parameters, only the id
    for (int i = 0; i < count; ++i) {
        if (encodings[i].encoding == id)
            return encodings + i;
    }

    if (!add) return 0;

    if (!(count % 4))
        encodings = (QtFontEncoding *)
                    realloc(encodings,
                             (((count+4) >> 2) << 2) * sizeof(QtFontEncoding));
    encodings[count].encoding = id;
    encodings[count].xpoint = xpoint;
    encodings[count].xres = xres;
    encodings[count].yres = yres;
    encodings[count].avgwidth = avgwidth;
    encodings[count].pitch = '*';
    return encodings + count++;
}
#endif // Q_WS_X11

struct QtFontStyle
{
    struct Key {
        Key(const QString &styleString);
        Key() : style(QFont::StyleNormal),
                weight(QFont::Normal), stretch(0) { }
        Key(const Key &o) : style(o.style),
                              weight(o.weight), stretch(o.stretch) { }
        uint style : 2;
        signed int  weight : 8;
        signed int stretch : 12;

        bool operator==(const Key & other) {
            return (style == other.style &&
                     weight == other.weight &&
                     (stretch == 0 || other.stretch == 0 || stretch == other.stretch));
        }
        bool operator!=(const Key &other) {
            return !operator==(other);
        }
        bool operator <(const Key &o) {
            int x = (style << 12) + (weight << 14) + stretch;
            int y = (o.style << 12) + (o.weight << 14) + o.stretch;
            return (x < y);
        }
    };

    QtFontStyle(const Key &k)
        : key(k), bitmapScalable(false), smoothScalable(false),
          count(0), pixelSizes(0)
    {
#if defined(Q_WS_X11)
        weightName = setwidthName = 0;
#endif // Q_WS_X11
    }

    ~QtFontStyle() {
#ifdef Q_WS_X11
        delete [] weightName;
        delete [] setwidthName;
#endif
#if defined(Q_WS_X11) || defined(Q_WS_QWS)
        while (count--) {
#ifdef Q_WS_X11
            free(pixelSizes[count].encodings);
#endif
#ifdef Q_WS_QWS
            pixelSizes[count].fileName.~QByteArray();
#endif
        }
#endif
        free(pixelSizes);
    }

    Key key;
    bool bitmapScalable : 1;
    bool smoothScalable : 1;
    signed int count    : 30;
    QtFontSize *pixelSizes;

#ifdef Q_WS_X11
    const char *weightName;
    const char *setwidthName;
#endif // Q_WS_X11
#ifdef Q_WS_QWS
    bool antialiased;
#endif

    QtFontSize *pixelSize(unsigned short size, bool = false);
};

QtFontStyle::Key::Key(const QString &styleString)
    : style(QFont::StyleNormal), weight(QFont::Normal), stretch(0)
{
    weight = getFontWeight(styleString);

    if (styleString.contains(QLatin1String("Italic"))
        || styleString.contains(qApp->translate("QFontDatabase", "Italic")))
        style = QFont::StyleItalic;
    else if (styleString.contains(QLatin1String("Oblique"))
             || styleString.contains(qApp->translate("QFontDatabase", "Oblique")))
        style = QFont::StyleOblique;
}

QtFontSize *QtFontStyle::pixelSize(unsigned short size, bool add)
{
    for (int i = 0; i < count; i++) {
        if (pixelSizes[i].pixelSize == size)
            return pixelSizes + i;
    }
    if (!add)
        return 0;

    if (!(count % 8))
        pixelSizes = (QtFontSize *)
                     realloc(pixelSizes,
                              (((count+8) >> 3) << 3) * sizeof(QtFontSize));
    pixelSizes[count].pixelSize = size;
#ifdef Q_WS_X11
    pixelSizes[count].count = 0;
    pixelSizes[count].encodings = 0;
#endif
#ifdef Q_WS_QWS
    new (&pixelSizes[count].fileName) QByteArray;
    pixelSizes[count].fileIndex = 0;
#endif
    return pixelSizes + (count++);
}

struct QtFontFoundry
{
    QtFontFoundry(const QString &n) : name(n), count(0), styles(0) {}
    ~QtFontFoundry() {
        while (count--)
            delete styles[count];
        free(styles);
    }

    QString name;

    int count;
    QtFontStyle **styles;
    QtFontStyle *style(const QtFontStyle::Key &, bool = false);
};

QtFontStyle *QtFontFoundry::style(const QtFontStyle::Key &key, bool create)
{
    int pos = 0;
    if (count) {
        int low = 0;
        int high = count;
        pos = count / 2;
        while (high > low) {
            if (styles[pos]->key == key)
                return styles[pos];
            if (styles[pos]->key < key)
                low = pos + 1;
            else
                high = pos;
            pos = (high + low) / 2;
        };
        pos = low;
    }
    if (!create)
        return 0;

//     qDebug("adding key (weight=%d, style=%d, oblique=%d stretch=%d) at %d", key.weight, key.style, key.oblique, key.stretch, pos);
    if (!(count % 8))
        styles = (QtFontStyle **)
                 realloc(styles, (((count+8) >> 3) << 3) * sizeof(QtFontStyle *));

    memmove(styles + pos + 1, styles + pos, (count-pos)*sizeof(QtFontStyle *));
    styles[pos] = new QtFontStyle(key);
    count++;
    return styles[pos];
}


struct QtFontFamily
{
    enum WritingSystemStatus {
        Unknown         = 0,
        Supported       = 1,
        UnsupportedFT  = 2,
        UnsupportedXLFD = 4,
        Unsupported     = UnsupportedFT | UnsupportedXLFD
    };

    QtFontFamily(const QString &n)
        :
#ifdef Q_WS_X11
        fixedPitch(true), ftWritingSystemCheck(false),
        xlfdLoaded(false), synthetic(false), symbol_checked(false),
#else
        fixedPitch(false),
#endif
#ifdef Q_WS_WIN
        writingSystemCheck(false),
        loaded(false),
#endif
#if !defined(QWS) && defined(Q_OS_MAC)
        fixedPitchComputed(false),
#endif
        name(n), count(0), foundries(0)
#if defined(Q_WS_QWS)
        , bogusWritingSystems(false)
#endif
    {
        memset(writingSystems, 0, sizeof(writingSystems));
    }
    ~QtFontFamily() {
        while (count--)
            delete foundries[count];
        free(foundries);
    }

    bool fixedPitch : 1;
#ifdef Q_WS_X11
    bool ftWritingSystemCheck : 1;
    bool xlfdLoaded : 1;
    bool synthetic : 1;
#endif
#ifdef Q_WS_WIN
    bool writingSystemCheck : 1;
    bool loaded : 1;
#endif
#if !defined(QWS) && defined(Q_OS_MAC)
    bool fixedPitchComputed : 1;
#endif
#ifdef Q_WS_X11
    bool symbol_checked;
#endif

    QString name;
    QString rawName;
#ifdef Q_WS_X11
    QByteArray fontFilename;
    int fontFileIndex;
#endif
#ifdef Q_WS_WIN
    QString english_name;
#endif
    int count;
    QtFontFoundry **foundries;

#ifdef Q_WS_QWS
    bool bogusWritingSystems;
    QStringList fallbackFamilies;
#endif
    unsigned char writingSystems[QFontDatabase::WritingSystemsCount];

    QtFontFoundry *foundry(const QString &f, bool = false);
};

#if !defined(QWS) && defined(Q_OS_MAC)
inline static void qt_mac_get_fixed_pitch(QtFontFamily *f)
{
    if(f && !f->fixedPitchComputed) {
        QFontMetrics fm(f->name);
        f->fixedPitch = fm.width(QLatin1Char('i')) == fm.width(QLatin1Char('m'));
        f->fixedPitchComputed = true;
    }
}
#endif


QtFontFoundry *QtFontFamily::foundry(const QString &f, bool create)
{
    if (f.isNull() && count == 1)
        return foundries[0];

    for (int i = 0; i < count; i++) {
        if (foundries[i]->name.compare(f, Qt::CaseInsensitive) == 0)
            return foundries[i];
    }
    if (!create)
        return 0;

    if (!(count % 8))
        foundries = (QtFontFoundry **)
                    realloc(foundries,
                             (((count+8) >> 3) << 3) * sizeof(QtFontFoundry *));

    foundries[count] = new QtFontFoundry(f);
    return foundries[count++];
}

// ### copied to tools/makeqpf/qpf2.cpp

#if (defined(Q_WS_QWS) && !defined(QT_NO_FREETYPE)) || defined(Q_WS_WIN) || defined(Q_WS_MAC)