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  #ifndef QGRAPHICSEFFECT_P_H
  #define QGRAPHICSEFFECT_P_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists for the convenience
  // of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
  // file may change from version to version without notice, or even be removed.
  //
  // We mean it.
  //
  
  #include "qgraphicseffect.h"
  
  #include <QPixmapCache>
  
  #include <private/qobject_p.h>
  #include <private/qpixmapfilter_p.h>
  
  #ifndef QT_NO_GRAPHICSEFFECT
  QT_BEGIN_NAMESPACE
  
  class QGraphicsEffectSourcePrivate;
  class Q_WIDGETS_EXPORT QGraphicsEffectSource : public QObject
  {
      Q_OBJECT
  public:
      ~QGraphicsEffectSource();
      const QGraphicsItem *graphicsItem() const;
      const QWidget *widget() const;
      const QStyleOption *styleOption() const;
  
      bool isPixmap() const;
      void draw(QPainter *painter);
      void update();
  
      QRectF boundingRect(Qt::CoordinateSystem coordinateSystem = Qt::LogicalCoordinates) const;
      QRect deviceRect() const;
      QPixmap pixmap(Qt::CoordinateSystem system = Qt::LogicalCoordinates,
                     QPoint *offset = 0,
                     QGraphicsEffect::PixmapPadMode mode = QGraphicsEffect::PadToEffectiveBoundingRect) const;
  
  protected:
      QGraphicsEffectSource(QGraphicsEffectSourcePrivate &dd, QObject *parent = 0);
  
  private:
      Q_DECLARE_PRIVATE(QGraphicsEffectSource)
      Q_DISABLE_COPY(QGraphicsEffectSource)
      friend class QGraphicsEffect;
      friend class QGraphicsEffectPrivate;
      friend class QGraphicsScenePrivate;
      friend class QGraphicsItem;
      friend class QGraphicsItemPrivate;
      friend class QWidget;
      friend class QWidgetPrivate;
  };
  
  class QGraphicsEffectSourcePrivate : public QObjectPrivate
  {
      Q_DECLARE_PUBLIC(QGraphicsEffectSource)
  public:
      QGraphicsEffectSourcePrivate()
          : QObjectPrivate()
          , m_cachedSystem(Qt::DeviceCoordinates)
          , m_cachedMode(QGraphicsEffect::PadToTransparentBorder)
      {}
  
      enum InvalidateReason
      {
          TransformChanged,
          EffectRectChanged,
          SourceChanged
      };
  
      virtual ~QGraphicsEffectSourcePrivate();
      virtual void detach() = 0;
      virtual QRectF boundingRect(Qt::CoordinateSystem system) const = 0;
      virtual QRect deviceRect() const = 0;
      virtual const QGraphicsItem *graphicsItem() const = 0;
      virtual const QWidget *widget() const = 0;
      virtual const QStyleOption *styleOption() const = 0;
      virtual void draw(QPainter *p) = 0;
      virtual void update() = 0;
      virtual bool isPixmap() const = 0;
      virtual QPixmap pixmap(Qt::CoordinateSystem system, QPoint *offset = 0,
                             QGraphicsEffect::PixmapPadMode mode = QGraphicsEffect::PadToTransparentBorder) const = 0;
      virtual void effectBoundingRectChanged() = 0;
  
      void setCachedOffset(const QPoint &offset);
      void invalidateCache(InvalidateReason reason = SourceChanged) const;
      Qt::CoordinateSystem currentCachedSystem() const { return m_cachedSystem; }
      QGraphicsEffect::PixmapPadMode currentCachedMode() const { return m_cachedMode; }
  
      friend class QGraphicsScenePrivate;
      friend class QGraphicsItem;
      friend class QGraphicsItemPrivate;
  
  private:
      mutable Qt::CoordinateSystem m_cachedSystem;
      mutable QGraphicsEffect::PixmapPadMode m_cachedMode;
      mutable QPoint m_cachedOffset;
      mutable QPixmapCache::Key m_cacheKey;
  };
  
  class Q_WIDGETS_EXPORT QGraphicsEffectPrivate : public QObjectPrivate
  {
      Q_DECLARE_PUBLIC(QGraphicsEffect)
  public:
      QGraphicsEffectPrivate() : source(0), isEnabled(1) {}
      ~QGraphicsEffectPrivate();
  
      inline void setGraphicsEffectSource(QGraphicsEffectSource *newSource)
      {
          QGraphicsEffect::ChangeFlags flags;
          if (source) {
              flags |= QGraphicsEffect::SourceDetached;
              source->d_func()->invalidateCache();
              source->d_func()->detach();
              delete source;
          }
          source = newSource;
          if (newSource)
              flags |= QGraphicsEffect::SourceAttached;
          q_func()->sourceChanged(flags);
      }
  
      QGraphicsEffectSource *source;
      QRectF boundingRect;
      quint32 isEnabled : 1;
      quint32 padding : 31; // feel free to use
  };
  
  
  class QGraphicsColorizeEffectPrivate : public QGraphicsEffectPrivate
  {
      Q_DECLARE_PUBLIC(QGraphicsColorizeEffect)
  public:
      QGraphicsColorizeEffectPrivate()
          : opaque(true)
      {
          filter = new QPixmapColorizeFilter;
      }
      ~QGraphicsColorizeEffectPrivate() { delete filter; }
  
      QPixmapColorizeFilter *filter;
      quint32 opaque : 1;
      quint32 padding : 31;
  };
  
  class QGraphicsBlurEffectPrivate : public QGraphicsEffectPrivate
  {
      Q_DECLARE_PUBLIC(QGraphicsBlurEffect)
  public:
      QGraphicsBlurEffectPrivate() : filter(new QPixmapBlurFilter) {}
      ~QGraphicsBlurEffectPrivate() { delete filter; }
  
      QPixmapBlurFilter *filter;
  };
  
  class QGraphicsDropShadowEffectPrivate : public QGraphicsEffectPrivate
  {
      Q_DECLARE_PUBLIC(QGraphicsDropShadowEffect)
  public:
      QGraphicsDropShadowEffectPrivate() : filter(new QPixmapDropShadowFilter) {}
      ~QGraphicsDropShadowEffectPrivate() { delete filter; }
  
      QPixmapDropShadowFilter *filter;
  };
  
  class QGraphicsOpacityEffectPrivate : public QGraphicsEffectPrivate
  {
      Q_DECLARE_PUBLIC(QGraphicsOpacityEffect)
  public:
      QGraphicsOpacityEffectPrivate()
          : opacity(qreal(0.7)), isFullyTransparent(0), isFullyOpaque(0), hasOpacityMask(0) {}
      ~QGraphicsOpacityEffectPrivate() {}
  
      qreal opacity;
      QBrush opacityMask;
      uint isFullyTransparent : 1;
      uint isFullyOpaque : 1;
      uint hasOpacityMask : 1;
  };
  
  QT_END_NAMESPACE
  
  #endif //QT_NO_GRAPHICSEFFECT
  #endif // QGRAPHICSEFFECT_P_H
  
  