/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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** This file is part of the QtGui module of the Qt Toolkit.
**
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** use the contact form at http://qt.digia.com/contact-us.
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
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** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#ifndef QWINDOWSURFACE_P_H
#define QWINDOWSURFACE_P_H

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

#include <QtGui/qwidget.h>

QT_BEGIN_NAMESPACE

class QPaintDevice;
class QRegion;
class QRect;
class QPoint;
class QImage;
class QWindowSurfacePrivate;
class QPlatformWindow;

class Q_GUI_EXPORT QWindowSurface
{
public:
    enum WindowSurfaceFeature {
        PartialUpdates               = 0x00000001, // Supports doing partial updates.
        PreservedContents            = 0x00000002, // Supports doing flush without first doing a repaint.
        StaticContents               = 0x00000004, // Supports having static content regions when being resized.
        AllFeatures                  = 0xffffffff  // For convenience
    };
    Q_DECLARE_FLAGS(WindowSurfaceFeatures, WindowSurfaceFeature)

    QWindowSurface(QWidget *window, bool setDefaultSurface = true);
    virtual ~QWindowSurface();

    QWidget *window() const;

    virtual QPaintDevice *paintDevice() = 0;

    // 'widget' can be a child widget, in which case 'region' is in child widget coordinates and
    // offset is the (child) widget's offset in relation to the window surface. On QWS, 'offset'
    // can be larger than just the offset from the top-level widget as there may also be window
    // decorations which are painted into the window surface.
    virtual void flush(QWidget *widget, const QRegion &region, const QPoint &offset) = 0;
#if !defined(Q_WS_QPA)
    virtual void setGeometry(const QRect &rect);
    QRect geometry() const;
#else
    virtual void resize(const QSize &size);
    QSize size() const;
    inline QRect geometry() const { return QRect(QPoint(), size()); }     //### cleanup before Qt 5
#endif

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

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

    virtual QImage* buffer(const QWidget *widget);
    virtual QPixmap grabWidget(const QWidget *widget, const QRect& rectangle = QRect()) const;

    virtual QPoint offset(const QWidget *widget) const;
    inline QRect rect(const QWidget *widget) const;

    bool hasFeature(WindowSurfaceFeature feature) const;
    virtual WindowSurfaceFeatures features() const;

    void setStaticContents(const QRegion &region);
    QRegion staticContents() const;

protected:
    bool hasStaticContents() const;

private:
    QWindowSurfacePrivate *d_ptr;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QWindowSurface::WindowSurfaceFeatures)

inline QRect QWindowSurface::rect(const QWidget *widget) const
{
    return widget->rect().translated(offset(widget));
}

inline bool QWindowSurface::hasFeature(WindowSurfaceFeature feature) const
{
    return (features() & feature) != 0;
}

QT_END_NAMESPACE

#endif // QWINDOWSURFACE_P_H
