text: /****************************************************************************
  **
  ** Copyright (C) 2015 The Qt Company Ltd.
  ** Contact: http://www.qt.io/licensing/
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  ** This file is part of the QtGui module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL21$
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  ** accordance with the commercial license agreement provided with the
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  ** Alternatively, this file may be used under the terms of the GNU Lesser
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  ****************************************************************************/
  
  #ifndef QPLATFORMFONTDATABASE_H
  #define QPLATFORMFONTDATABASE_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is part of the QPA API and is not meant to be used
  // in applications. Usage of this API may make your code
  // source and binary incompatible with future versions of Qt.
  //
  
  #include <QtCore/qconfig.h>
  #include <QtCore/QString>
  #include <QtCore/QStringList>
  #include <QtCore/QList>
  #include <QtCore/QHash>
  #include <QtGui/QFontDatabase>
  #include <QtGui/private/qfontengine_p.h>
  #include <QtGui/private/qfont_p.h>
  
  QT_BEGIN_NAMESPACE
  
  
  class QWritingSystemsPrivate;
  
  class Q_GUI_EXPORT QSupportedWritingSystems
  {
  public:
  
      QSupportedWritingSystems();
      QSupportedWritingSystems(const QSupportedWritingSystems &other);
      QSupportedWritingSystems &operator=(const QSupportedWritingSystems &other);
      ~QSupportedWritingSystems();
  
      void setSupported(QFontDatabase::WritingSystem, bool supported = true);
      bool supported(QFontDatabase::WritingSystem) const;
  
  private:
      void detach();
  
      QWritingSystemsPrivate *d;
  
      friend Q_GUI_EXPORT bool operator==(const QSupportedWritingSystems &, const QSupportedWritingSystems &);
      friend Q_GUI_EXPORT bool operator!=(const QSupportedWritingSystems &, const QSupportedWritingSystems &);
  };
  
  Q_GUI_EXPORT bool operator==(const QSupportedWritingSystems &, const QSupportedWritingSystems &);
  Q_GUI_EXPORT bool operator!=(const QSupportedWritingSystems &, const QSupportedWritingSystems &);
  
  class QFontRequestPrivate;
  class QFontEngineMulti;
  
  class Q_GUI_EXPORT QPlatformFontDatabase
  {
  public:
      virtual ~QPlatformFontDatabase();
      virtual void populateFontDatabase();
      virtual void populateFamily(const QString &familyName);
      virtual void invalidate();
  
      virtual QFontEngineMulti *fontEngineMulti(QFontEngine *fontEngine, QChar::Script script);
      virtual QFontEngine *fontEngine(const QFontDef &fontDef, void *handle);
      virtual QStringList fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const;
      virtual QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName);
      virtual void releaseHandle(void *handle);
  
      virtual QFontEngine *fontEngine(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference);
  
      virtual QString fontDir() const;
  
      virtual QFont defaultFont() const;
      virtual bool isPrivateFontFamily(const QString &family) const;
  
      virtual QString resolveFontFamilyAlias(const QString &family) const;
      virtual bool fontsAlwaysScalable() const;
      virtual QList<int> standardSizes() const;
      QFontEngine::SubpixelAntialiasingType subpixelAntialiasingTypeHint() const;
  
      // helper
      static QSupportedWritingSystems writingSystemsFromTrueTypeBits(quint32 unicodeRange[4], quint32 codePageRange[2]);
      static QFont::Weight weightFromInteger(int weight);
  
      //callback
      static void registerQPF2Font(const QByteArray &dataArray, void *handle);
      static void registerFont(const QString &familyname, const QString &stylename,
                               const QString &foundryname, QFont::Weight weight,
                               QFont::Style style, QFont::Stretch stretch, bool antialiased,
                               bool scalable, int pixelSize, bool fixedPitch,
                               const QSupportedWritingSystems &writingSystems, void *handle);
  
      static void registerFontFamily(const QString &familyName);
      static void registerAliasToFontFamily(const QString &familyName, const QString &alias);
  };
  
  QT_END_NAMESPACE
  
  #endif // QPLATFORMFONTDATABASE_H
  