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#ifndef NODEUPDATER_P_H
#define NODEUPDATER_P_H

#include <private/qtquickglobal_p.h>
#include <QtGui/private/qdatabuffer_p.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QSGNode;
class QSGTransformNode;
class QSGClipNode;
class QSGOpacityNode;
class QSGGeometryNode;
class QMatrix4x4;
class QSGRenderNode;

class Q_QUICK_PRIVATE_EXPORT QSGNodeUpdater
{
public:
    QSGNodeUpdater();
    virtual ~QSGNodeUpdater();

    virtual void updateStates(QSGNode *n);
    virtual bool isNodeBlocked(QSGNode *n, QSGNode *root) const;

    void setToplevelOpacity(qreal alpha) { m_opacity_stack.last() = alpha; }
    qreal toplevelOpacity() const { return m_opacity_stack.last(); }

protected:
    virtual void enterTransformNode(QSGTransformNode *);
    virtual void leaveTransformNode(QSGTransformNode *);
    void enterClipNode(QSGClipNode *c);
    void leaveClipNode(QSGClipNode *c);
    void enterOpacityNode(QSGOpacityNode *o);
    void leaveOpacityNode(QSGOpacityNode *o);
    void enterGeometryNode(QSGGeometryNode *);
    void leaveGeometryNode(QSGGeometryNode *);
    void enterRenderNode(QSGRenderNode *);
    void leaveRenderNode(QSGRenderNode *);

    void visitNode(QSGNode *n);
    void visitChildren(QSGNode *n);


    QDataBuffer<const QMatrix4x4 *> m_combined_matrix_stack;
    QDataBuffer<qreal> m_opacity_stack;
    const QSGClipNode *m_current_clip;

    int m_force_update;

    qreal m_toplevel_alpha;
};

QT_END_NAMESPACE

QT_END_HEADER

#endif // NODEUPDATER_P_H
