/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU 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 met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
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**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QPAINTDEVICE_H
#define QPAINTDEVICE_H

#include <QtGui/qwindowdefs.h>
#include <QtCore/qrect.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Gui)

#if defined(Q_WS_QWS)
class QWSDisplay;
#endif

class QPaintEngine;

class Q_GUI_EXPORT QPaintDevice                                // device for QPainter
{
public:
    enum PaintDeviceMetric {
        PdmWidth = 1,
        PdmHeight,
        PdmWidthMM,
        PdmHeightMM,
        PdmNumColors,
        PdmDepth,
        PdmDpiX,
        PdmDpiY,
        PdmPhysicalDpiX,
        PdmPhysicalDpiY
    };

    virtual ~QPaintDevice();

    virtual int devType() const;
    bool paintingActive() const;
    virtual QPaintEngine *paintEngine() const = 0;

#if defined(Q_WS_QWS)
    static QWSDisplay *qwsDisplay();
#endif

#ifdef Q_WS_WIN
    virtual HDC getDC() const;
    virtual void releaseDC(HDC hdc) const;
#endif

    int width() const { return metric(PdmWidth); }
    int height() const { return metric(PdmHeight); }
    int widthMM() const { return metric(PdmWidthMM); }
    int heightMM() const { return metric(PdmHeightMM); }
    int logicalDpiX() const { return metric(PdmDpiX); }
    int logicalDpiY() const { return metric(PdmDpiY); }
    int physicalDpiX() const { return metric(PdmPhysicalDpiX); }
    int physicalDpiY() const { return metric(PdmPhysicalDpiY); }
#ifdef QT_DEPRECATED
    QT_DEPRECATED int numColors() const { return metric(PdmNumColors); }
#endif
    int colorCount() const { return metric(PdmNumColors); }
    int depth() const { return metric(PdmDepth); }

protected:
    QPaintDevice();
    virtual int metric(PaintDeviceMetric metric) const;
    virtual void init(QPainter *painter) const;
    virtual QPaintDevice *redirected(QPoint *offset) const;
    virtual QPainter *sharedPainter() const;

    ushort        painters;                        // refcount

private:
    Q_DISABLE_COPY(QPaintDevice)

    friend class QPainter;
    friend class QPainterPrivate;
    friend class QFontEngineMac;
    friend class QX11PaintEngine;
    friend Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, PaintDeviceMetric metric);
};

/*****************************************************************************
  Inline functions
 *****************************************************************************/

inline int QPaintDevice::devType() const
{ return QInternal::UnknownDevice; }

inline bool QPaintDevice::paintingActive() const
{ return painters != 0; }

QT_END_NAMESPACE

QT_END_HEADER

#endif // QPAINTDEVICE_H