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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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 handleResizeEvent() override
{
Q_Q(QRasterWindow);
if (backingstore->size() != q->size())
markWindowAsDirty();
}
void beginPaint(const QRegion ®ion) override
{
Q_Q(QRasterWindow);
const QSize size = q->size();
if (backingstore->size() != size)
backingstore->resize(size);
backingstore->beginPaint(region);
}
void endPaint() override
{
backingstore->endPaint();
}
void flush(const QRegion ®ion) 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));
}
QRasterWindow::~QRasterWindow()
{
Q_D(QRasterWindow);
// Delete backingstore while window is still alive, as it
// might need to reference the window in the process
d->backingstore.reset(nullptr);
}
/*!
\internal
*/
int QRasterWindow::metric(PaintDeviceMetric metric) const
{
Q_D(const QRasterWindow);
switch (metric) {
case PdmDepth:
return d->backingstore->paintDevice()->depth();
default:
break;
}
return QPaintDeviceWindow::metric(metric);
}
/*!
\internal
*/
QPaintDevice *QRasterWindow::redirected(QPoint *) const
{
Q_D(const QRasterWindow);
return d->backingstore->paintDevice();
}
void QRasterWindow::resizeEvent(QResizeEvent *)
{
}
QT_END_NAMESPACE
#include "moc_qrasterwindow.cpp"
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