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    41 

    42 #ifndef QABSTRACTFONTENGINE_QWS_H

    43 #define QABSTRACTFONTENGINE_QWS_H

    44 

    45 #include <QtCore/qobject.h>

    46 #include <QtCore/qhash.h>

    47 #include <QtCore/qvariant.h>

    48 #include <QtCore/qfactoryinterface.h>

    49 #include <QtGui/qpaintengine.h>

    50 #include <QtGui/qfontdatabase.h>

    51 

    52 QT_BEGIN_HEADER

    53 

    54 QT_BEGIN_NAMESPACE

    55 

    56 QT_MODULE(Gui)

    57 

    58 class QFontEngineInfoPrivate;

    59 

    60 class Q_GUI_EXPORT QFontEngineInfo

    61 {

    62 public:

    63     QDOC_PROPERTY(QString family READ family WRITE setFamily)

    64     QDOC_PROPERTY(qreal pixelSize READ pixelSize WRITE setPixelSize)

    65     QDOC_PROPERTY(int weight READ weight WRITE setWeight)

    66     QDOC_PROPERTY(QFont::Style style READ style WRITE setStyle)

    67     QDOC_PROPERTY(QList<QFontDatabase::WritingSystem> writingSystems READ writingSystems WRITE setWritingSystems)

    68 

    69     QFontEngineInfo();

    70     explicit QFontEngineInfo(const QString &family);

    71     QFontEngineInfo(const QFontEngineInfo &other);

    72     QFontEngineInfo &operator=(const QFontEngineInfo &other);

    73     ~QFontEngineInfo();

    74 

    75     void setFamily(const QString &name);

    76     QString family() const;

    77 

    78     void setPixelSize(qreal size);

    79     qreal pixelSize() const;

    80 

    81     void setWeight(int weight);

    82     int weight() const;

    83 

    84     void setStyle(QFont::Style style);

    85     QFont::Style style() const;

    86 

    87     QList<QFontDatabase::WritingSystem> writingSystems() const;

    88     void setWritingSystems(const QList<QFontDatabase::WritingSystem> &writingSystems);

    89 

    90 private:

    91     QFontEngineInfoPrivate *d;

    92 };

    93 

    94 class QAbstractFontEngine;

    95 

    96 struct Q_GUI_EXPORT QFontEngineFactoryInterface : public QFactoryInterface

    97 {

    98      virtual QAbstractFontEngine *create(const QFontEngineInfo &info) = 0;

    99      virtual QList<QFontEngineInfo> availableFontEngines() const = 0;

   100 };

   101 

   102 #define QFontEngineFactoryInterface_iid "com.trolltech.Qt.QFontEngineFactoryInterface"

   103 Q_DECLARE_INTERFACE(QFontEngineFactoryInterface, QFontEngineFactoryInterface_iid)

   104 

   105 class QFontEnginePluginPrivate;

   106 

   107 class Q_GUI_EXPORT QFontEnginePlugin : public QObject, public QFontEngineFactoryInterface

   108 {

   109     Q_OBJECT

   110     Q_INTERFACES(QFontEngineFactoryInterface:QFactoryInterface)

   111 public:

   112     QFontEnginePlugin(const QString &foundry, QObject *parent = 0);

   113     ~QFontEnginePlugin();

   114 

   115     virtual QStringList keys() const;

   116 

   117     virtual QAbstractFontEngine *create(const QFontEngineInfo &info) = 0;

   118     virtual QList<QFontEngineInfo> availableFontEngines() const = 0;

   119 

   120 private:

   121     Q_DECLARE_PRIVATE(QFontEnginePlugin)

   122     Q_DISABLE_COPY(QFontEnginePlugin)

   123 };

   124 

   125 class QAbstractFontEnginePrivate;

   126 

   127 class Q_GUI_EXPORT QAbstractFontEngine : public QObject

   128 {

   129     Q_OBJECT

   130 public:

   131     enum Capability {

   132         CanOutlineGlyphs = 1,

   133         CanRenderGlyphs_Mono = 2,

   134         CanRenderGlyphs_Gray = 4,

   135         CanRenderGlyphs = CanRenderGlyphs_Mono | CanRenderGlyphs_Gray

   136     };

   137     Q_DECLARE_FLAGS(Capabilities, Capability)

   138 

   139     explicit QAbstractFontEngine(QObject *parent = 0);

   140     ~QAbstractFontEngine();

   141 

   142     typedef int Fixed; // 26.6

   143 

   144     struct FixedPoint

   145     {

   146         Fixed x;

   147         Fixed y;

   148     };

   149 

   150     struct GlyphMetrics

   151     {

   152         inline GlyphMetrics()

   153             : x(0), y(0), width(0), height(0),

   154               advance(0) {}

   155         Fixed x;

   156         Fixed y;

   157         Fixed width;

   158         Fixed height;

   159         Fixed advance;

   160     };

   161 

   162     enum FontProperty {

   163         Ascent,

   164         Descent,

   165         Leading,

   166         XHeight,

   167         AverageCharWidth,

   168         LineThickness,

   169         UnderlinePosition,

   170         MaxCharWidth,

   171         MinLeftBearing,

   172         MinRightBearing,

   173         GlyphCount,

   174 

   175         // hints

   176         CacheGlyphsHint,

   177         OutlineGlyphsHint

   178     };

   179 

   180     // keep in sync with QTextEngine::ShaperFlag!!

   181     enum TextShapingFlag {

   182         RightToLeft         = 0x0001,

   183         ReturnDesignMetrics = 0x0002

   184     };

   185     Q_DECLARE_FLAGS(TextShapingFlags, TextShapingFlag)

   186 

   187     virtual Capabilities capabilities() const = 0;

   188     virtual QVariant fontProperty(FontProperty property) const = 0;

   189 

   190     virtual bool convertStringToGlyphIndices(const QChar *string, int length, uint *glyphs, int *numGlyphs, TextShapingFlags flags) const = 0;

   191 

   192     virtual void getGlyphAdvances(const uint *glyphs, int numGlyphs, Fixed *advances, TextShapingFlags flags) const = 0;

   193 

   194     virtual GlyphMetrics glyphMetrics(uint glyph) const = 0;

   195 

   196     virtual bool renderGlyph(uint glyph, int depth, int bytesPerLine, int height, uchar *buffer);

   197 

   198     virtual void addGlyphOutlinesToPath(uint *glyphs, int numGlyphs, FixedPoint *positions, QPainterPath *path);

   199 

   200     /*

   201     enum Extension {

   202         GetTrueTypeTable

   203     };

   204 

   205     virtual bool supportsExtension(Extension extension) const;

   206     virtual QVariant extension(Extension extension, const QVariant &argument = QVariant());

   207     */

   208 

   209 private:

   210     Q_DECLARE_PRIVATE(QAbstractFontEngine)

   211     Q_DISABLE_COPY(QAbstractFontEngine)

   212 };

   213 

   214 Q_DECLARE_OPERATORS_FOR_FLAGS(QAbstractFontEngine::Capabilities)

   215 Q_DECLARE_OPERATORS_FOR_FLAGS(QAbstractFontEngine::TextShapingFlags)

   216 

   217 QT_END_NAMESPACE

   218 

   219 QT_END_HEADER

   220 

   221 #endif