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  #ifndef QWAYLANDSHMBACKINGSTORE_H
  #define QWAYLANDSHMBACKINGSTORE_H
  
  #include <QtWaylandClient/private/qwaylandbuffer_p.h>
  
  #include <qpa/qplatformbackingstore.h>
  #include <QtGui/QImage>
  #include <qpa/qplatformwindow.h>
  
  QT_BEGIN_NAMESPACE
  
  class QWaylandDisplay;
  class QWaylandAbstractDecoration;
  class QWaylandShmWindow;
  
  class Q_WAYLAND_CLIENT_EXPORT QWaylandShmBuffer : public QWaylandBuffer {
  public:
      QWaylandShmBuffer(QWaylandDisplay *display,
             const QSize &size, QImage::Format format);
      ~QWaylandShmBuffer();
      QSize size() const { return mImage.size(); }
      QImage *image() { return &mImage; }
  
      QImage *imageInsideMargins(const QMargins &margins);
  private:
      QImage mImage;
      struct wl_shm_pool *mShmPool;
      QMargins mMargins;
      QImage *mMarginsImage;
  };
  
  class Q_WAYLAND_CLIENT_EXPORT QWaylandShmBackingStore : public QPlatformBackingStore
  {
  public:
      QWaylandShmBackingStore(QWindow *window);
      ~QWaylandShmBackingStore();
  
      QPaintDevice *paintDevice();
      void flush(QWindow *window, const QRegion &region, const QPoint &offset);
      void resize(const QSize &size, const QRegion &staticContents);
      void resize(const QSize &size);
      void beginPaint(const QRegion &);
      void endPaint();
      void hidden();
  
      QWaylandAbstractDecoration *windowDecoration() const;
  
      QMargins windowDecorationMargins() const;
      QImage *entireSurface() const;
      void ensureSize();
  
      QWaylandShmWindow *waylandWindow() const;
      void iterateBuffer();
  
  private:
      void updateDecorations();
  
      QWaylandDisplay *mDisplay;
      QWaylandShmBuffer *mFrontBuffer;
      QWaylandShmBuffer *mBackBuffer;
      bool mFrontBufferIsDirty;
      bool mPainting;
  
      QSize mRequestedSize;
      Qt::WindowFlags mCurrentWindowFlags;
  
      static const struct wl_callback_listener frameCallbackListener;
      static void done(void *data,
               struct wl_callback *callback,
               uint32_t time);
      struct wl_callback *mFrameCallback;
  };
  
  QT_END_NAMESPACE
  
  #endif
  