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qabstractfontengine_qws.h：源码内容
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**
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#ifndef QABSTRACTFONTENGINE_QWS_H
#define QABSTRACTFONTENGINE_QWS_H
#include <QtCore/qobject.h>
#include <QtCore/qhash.h>
#include <QtCore/qvariant.h>
#include <QtCore/qfactoryinterface.h>
#include <QtGui/qpaintengine.h>
#include <QtGui/qfontdatabase.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Gui)
class QFontEngineInfoPrivate;
class Q_GUI_EXPORT QFontEngineInfo
{
public:
    QDOC_PROPERTY(QString family READ family WRITE setFamily)
    QDOC_PROPERTY(qreal pixelSize READ pixelSize WRITE setPixelSize)
    QDOC_PROPERTY(int weight READ weight WRITE setWeight)
    QDOC_PROPERTY(QFont::Style style READ style WRITE setStyle)
    QDOC_PROPERTY(QList<QFontDatabase::WritingSystem> writingSystems READ writingSystems WRITE setWritingSystems)
    QFontEngineInfo();
    explicit QFontEngineInfo(const QString &family);
    QFontEngineInfo(const QFontEngineInfo &other);
    QFontEngineInfo &operator=(const QFontEngineInfo &other);
    ~QFontEngineInfo();
    void setFamily(const QString &name);
    QString family() const;
    void setPixelSize(qreal size);
    qreal pixelSize() const;
    void setWeight(int weight);
    int weight() const;
    void setStyle(QFont::Style style);
    QFont::Style style() const;
    QList<QFontDatabase::WritingSystem> writingSystems() const;
    void setWritingSystems(const QList<QFontDatabase::WritingSystem> &writingSystems);
private:
    QFontEngineInfoPrivate *d;
};
class QAbstractFontEngine;
struct Q_GUI_EXPORT QFontEngineFactoryInterface : public QFactoryInterface
{
     virtual QAbstractFontEngine *create(const QFontEngineInfo &info) = 0;
     virtual QList<QFontEngineInfo> availableFontEngines() const = 0;
};
#define QFontEngineFactoryInterface_iid "com.trolltech.Qt.QFontEngineFactoryInterface"
Q_DECLARE_INTERFACE(QFontEngineFactoryInterface, QFontEngineFactoryInterface_iid)
class QFontEnginePluginPrivate;
class Q_GUI_EXPORT QFontEnginePlugin : public QObject, public QFontEngineFactoryInterface
{
    Q_OBJECT
    Q_INTERFACES(QFontEngineFactoryInterface:QFactoryInterface)
public:
    QFontEnginePlugin(const QString &foundry, QObject *parent = 0);
    ~QFontEnginePlugin();
    virtual QStringList keys() const;
    virtual QAbstractFontEngine *create(const QFontEngineInfo &info) = 0;
    virtual QList<QFontEngineInfo> availableFontEngines() const = 0;
private:
    Q_DECLARE_PRIVATE(QFontEnginePlugin)
    Q_DISABLE_COPY(QFontEnginePlugin)
};
class QAbstractFontEnginePrivate;
class Q_GUI_EXPORT QAbstractFontEngine : public QObject
{
    Q_OBJECT
public:
    enum Capability {
        CanOutlineGlyphs = 1,
        CanRenderGlyphs_Mono = 2,
        CanRenderGlyphs_Gray = 4,
        CanRenderGlyphs = CanRenderGlyphs_Mono | CanRenderGlyphs_Gray
    };
    Q_DECLARE_FLAGS(Capabilities, Capability)
    explicit QAbstractFontEngine(QObject *parent = 0);
    ~QAbstractFontEngine();
    typedef int Fixed; // 26.6
    struct FixedPoint
    {
        Fixed x;
        Fixed y;
    };
    struct GlyphMetrics
    {
        inline GlyphMetrics()
            : x(0), y(0), width(0), height(0),
              advance(0) {}
        Fixed x;
        Fixed y;
        Fixed width;
        Fixed height;
        Fixed advance;
    };
    enum FontProperty {
        Ascent,
        Descent,
        Leading,
        XHeight,
        AverageCharWidth,
        LineThickness,
        UnderlinePosition,
        MaxCharWidth,
        MinLeftBearing,
        MinRightBearing,
        GlyphCount,
        // hints
        CacheGlyphsHint,
        OutlineGlyphsHint
    };
    // keep in sync with QTextEngine::ShaperFlag!!
    enum TextShapingFlag {
        RightToLeft         = 0x0001,
        ReturnDesignMetrics = 0x0002
    };
    Q_DECLARE_FLAGS(TextShapingFlags, TextShapingFlag)
    virtual Capabilities capabilities() const = 0;
    virtual QVariant fontProperty(FontProperty property) const = 0;
    virtual bool convertStringToGlyphIndices(const QChar *string, int length, uint *glyphs, int *numGlyphs, TextShapingFlags flags) const = 0;
    virtual void getGlyphAdvances(const uint *glyphs, int numGlyphs, Fixed *advances, TextShapingFlags flags) const = 0;
    virtual GlyphMetrics glyphMetrics(uint glyph) const = 0;
    virtual bool renderGlyph(uint glyph, int depth, int bytesPerLine, int height, uchar *buffer);
    virtual void addGlyphOutlinesToPath(uint *glyphs, int numGlyphs, FixedPoint *positions, QPainterPath *path);
    /*
    enum Extension {
        GetTrueTypeTable
    };
    virtual bool supportsExtension(Extension extension) const;
    virtual QVariant extension(Extension extension, const QVariant &argument = QVariant());
    */
private:
    Q_DECLARE_PRIVATE(QAbstractFontEngine)
    Q_DISABLE_COPY(QAbstractFontEngine)
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QAbstractFontEngine::Capabilities)
Q_DECLARE_OPERATORS_FOR_FLAGS(QAbstractFontEngine::TextShapingFlags)
QT_END_NAMESPACE
QT_END_HEADER
#endif

						