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#ifndef QOPENGLCOMPOSITORBACKINGSTORE_H
#define QOPENGLCOMPOSITORBACKINGSTORE_H

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

#include <qpa/qplatformbackingstore.h>
#include <QImage>
#include <QRegion>

QT_BEGIN_NAMESPACE

class QOpenGLContext;
class QPlatformTextureList;

class QOpenGLCompositorBackingStore : public QPlatformBackingStore
{
public:
    QOpenGLCompositorBackingStore(QWindow *window);
    ~QOpenGLCompositorBackingStore();

    QPaintDevice *paintDevice() Q_DECL_OVERRIDE;

    void beginPaint(const QRegion &region) Q_DECL_OVERRIDE;

    void flush(QWindow *window, const QRegion &region, const QPoint &offset) Q_DECL_OVERRIDE;
    void resize(const QSize &size, const QRegion &staticContents) Q_DECL_OVERRIDE;

    QImage toImage() const Q_DECL_OVERRIDE;
    void composeAndFlush(QWindow *window, const QRegion &region, const QPoint &offset,
                         QPlatformTextureList *textures, QOpenGLContext *context,
                         bool translucentBackground) Q_DECL_OVERRIDE;

    const QPlatformTextureList *textures() const { return m_textures; }

    void notifyComposited();

private:
    void updateTexture();

    QWindow *m_window;
    QImage m_image;
    QRegion m_dirty;
    uint m_bsTexture;
    QOpenGLContext *m_bsTextureContext;
    QPlatformTextureList *m_textures;
    QPlatformTextureList *m_lockedWidgetTextures;
};

QT_END_NAMESPACE

#endif // QOPENGLCOMPOSITORBACKINGSTORE_H
