/****************************************************************************
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****************************************************************************/

#ifndef QWINDOWSURFACE_GL_P_H
#define QWINDOWSURFACE_GL_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of the QLibrary class.  This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//

#include <qglobal.h>
#include <qgl.h>
#include <private/qwindowsurface_p.h>
#include <private/qglpaintdevice_p.h>

QT_BEGIN_NAMESPACE

class QPaintDevice;
class QPoint;
class QRegion;
class QWidget;
struct QGLWindowSurfacePrivate;

#ifdef Q_WS_QPA
Q_OPENGL_EXPORT const QGLContext* qt_gl_share_context();
#else
Q_OPENGL_EXPORT QGLWidget* qt_gl_share_widget();
Q_OPENGL_EXPORT void qt_destroy_gl_share_widget();
#endif

class QGLWindowSurfaceGLPaintDevice : public QGLPaintDevice
{
public:
    QPaintEngine* paintEngine() const;
    void endPaint();
    QSize size() const;
    int metric(PaintDeviceMetric m) const;
    QGLContext* context() const;
    QGLWindowSurfacePrivate* d;
};

class Q_OPENGL_EXPORT QGLWindowSurface : public QObject, public QWindowSurface // , public QPaintDevice
{
    Q_OBJECT
public:
    QGLWindowSurface(QWidget *window);
    ~QGLWindowSurface();

    QPaintDevice *paintDevice();
    void flush(QWidget *widget, const QRegion &region, const QPoint &offset);

#if !defined(Q_WS_QPA)
    void setGeometry(const QRect &rect);
#else
    virtual void resize(const QSize &size);
#endif

    void updateGeometry();
    bool scroll(const QRegion &area, int dx, int dy);

    void beginPaint(const QRegion &region);
    void endPaint(const QRegion &region);

    QImage *buffer(const QWidget *widget);

    bool hasPartialUpdateSupport() const;

    QGLContext *context() const;

    static QGLFormat surfaceFormat;

    enum SwapMode { AutomaticSwap, AlwaysFullSwap, AlwaysPartialSwap, KillSwap };
    static SwapMode swapBehavior;

private slots:
    void deleted(QObject *object);

private:
    void hijackWindow(QWidget *widget);
    bool initializeOffscreenTexture(const QSize &size);

    QGLWindowSurfacePrivate *d_ptr;
};

QT_END_NAMESPACE

#endif // QWINDOWSURFACE_GL_P_H