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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qrasterwindow.h"
#include <QtGui/private/qpaintdevicewindow_p.h>
#include <QtGui/QBackingStore>
#include <QtGui/QPainter>
QT_BEGIN_NAMESPACE
/*!
\class QRasterWindow
\inmodule QtGui
\since 5.4
\brief QRasterWindow is a convenience class for using QPainter on a QWindow
QRasterWindow is a QWindow with a raster-based, non-OpenGL surface. On top of
the functionality offered by QWindow, QRasterWindow adds a virtual
paintEvent() function and the possibility to open a QPainter on itself. The
underlying paint engine will be the raster one, meaning that all drawing will
happen on the CPU. For performing accelerated, OpenGL-based drawing, use
QOpenGLWindow instead.
Internally the class is thin wrapper for QWindow and QBackingStore
and is very similar to the \l{Raster Window Example}{Raster Window
Example} that uses these classes directly.
\sa QPaintDeviceWindow::paintEvent(), QPaintDeviceWindow::update()
*/
class QRasterWindowPrivate : public QPaintDeviceWindowPrivate
{
Q_DECLARE_PUBLIC(QRasterWindow)
public:
void beginPaint(const QRegion ®ion) Q_DECL_OVERRIDE
{
Q_Q(QRasterWindow);
if (backingstore->size() != q->size()) {
backingstore->resize(q->size());
markWindowAsDirty();
}
backingstore->beginPaint(region);
}
void endPaint() Q_DECL_OVERRIDE
{
backingstore->endPaint();
}
void flush(const QRegion ®ion) Q_DECL_OVERRIDE
{
Q_Q(QRasterWindow);
backingstore->flush(region, q);
}
QScopedPointer<QBackingStore> backingstore;
};
/*!
Constructs a new QRasterWindow with \a parent.
*/
QRasterWindow::QRasterWindow(QWindow *parent)
: QPaintDeviceWindow(*(new QRasterWindowPrivate), parent)
{
setSurfaceType(QSurface::RasterSurface);
d_func()->backingstore.reset(new QBackingStore(this));
}
/*!
\internal
*/
int QRasterWindow::metric(PaintDeviceMetric metric) const
{
Q_D(const QRasterWindow);
switch (metric) {
case PdmDepth:
return d->backingstore->paintDevice()->depth();
case PdmDevicePixelRatio:
return d->backingstore->paintDevice()->devicePixelRatio();
default:
break;
}
return QPaintDeviceWindow::metric(metric);
}
/*!
\internal
*/
QPaintDevice *QRasterWindow::redirected(QPoint *) const
{
Q_D(const QRasterWindow);
return d->backingstore->paintDevice();
}
QT_END_NAMESPACE
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