src/gui/painting/qpaintengine_p.h
author Eckhart Koeppen <eckhart.koppen@nokia.com>
Wed, 21 Apr 2010 20:15:53 +0300
branchRCL_3
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QPAINTENGINE_P_H
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#define QPAINTENGINE_P_H
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//
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//  W A R N I N G
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//  -------------
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//
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// This file is not part of the Qt API.  It exists for the convenience
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// of other Qt classes.  This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include "QtGui/qpainter.h"
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#include "QtGui/qpaintengine.h"
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#include "QtGui/qregion.h"
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#include "private/qobject_p.h"
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QT_BEGIN_NAMESPACE
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class QPaintDevice;
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class QPaintEnginePrivate
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{
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    Q_DECLARE_PUBLIC(QPaintEngine)
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public:
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    QPaintEnginePrivate() : pdev(0), q_ptr(0), currentClipWidget(0), hasSystemTransform(0),
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                            hasSystemViewport(0) {}
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    virtual ~QPaintEnginePrivate() { }
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    QPaintDevice *pdev;
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    QPaintEngine *q_ptr;
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    QRegion systemClip;
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    QRect systemRect;
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    QRegion systemViewport;
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    QTransform systemTransform;
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    QWidget *currentClipWidget;
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    uint hasSystemTransform : 1;
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    uint hasSystemViewport : 1;
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    inline void transformSystemClip()
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    {
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        if (systemClip.isEmpty())
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            return;
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        if (hasSystemTransform) {
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            if (systemTransform.type() <= QTransform::TxTranslate)
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                systemClip.translate(qRound(systemTransform.dx()), qRound(systemTransform.dy()));
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            else
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                systemClip = systemTransform.map(systemClip);
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        }
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        // Make sure we're inside the viewport.
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        if (hasSystemViewport) {
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            systemClip &= systemViewport;
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            if (systemClip.isEmpty()) {
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                // We don't want to paint without system clip, so set it to 1 pixel :)
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                systemClip = QRect(systemViewport.boundingRect().topLeft(), QSize(1, 1));
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            }
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        }
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    }
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    inline void setSystemTransform(const QTransform &xform)
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    {
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        systemTransform = xform;
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        if ((hasSystemTransform = !xform.isIdentity()) || hasSystemViewport)
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            transformSystemClip();
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        systemStateChanged();
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    }
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    inline void setSystemViewport(const QRegion &region)
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    {
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        systemViewport = region;
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        hasSystemViewport = !systemViewport.isEmpty();
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    }
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    virtual void systemStateChanged() { }
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    void drawBoxTextItem(const QPointF &p, const QTextItemInt &ti);
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};
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QT_END_NAMESPACE
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#endif // QPAINTENGINE_P_H