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108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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#include "qrasterwindow.h"
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#include <QtGui/private/qpaintdevicewindow_p.h>
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#include <QtGui/QBackingStore>
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#include <QtGui/QPainter>
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QT_BEGIN_NAMESPACE
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/*!
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\class QRasterWindow
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\inmodule QtGui
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\since 5.4
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\brief QRasterWindow is a convenience class for using QPainter on a QWindow.
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QRasterWindow is a QWindow with a raster-based, non-OpenGL surface. On top of
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the functionality offered by QWindow, QRasterWindow adds a virtual
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paintEvent() function and the possibility to open a QPainter on itself. The
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underlying paint engine will be the raster one, meaning that all drawing will
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happen on the CPU. For performing accelerated, OpenGL-based drawing, use
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QOpenGLWindow instead.
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Internally the class is thin wrapper for QWindow and QBackingStore
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and is very similar to the \l{Raster Window Example}{Raster Window
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Example} that uses these classes directly.
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\sa QPaintDeviceWindow::paintEvent(), QPaintDeviceWindow::update()
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*/
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class QRasterWindowPrivate : public QPaintDeviceWindowPrivate
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{
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Q_DECLARE_PUBLIC(QRasterWindow)
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public:
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void beginPaint(const QRegion ®ion) override
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{
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Q_Q(QRasterWindow);
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const QSize size = q->size();
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if (backingstore->size() != size) {
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backingstore->resize(size);
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markWindowAsDirty();
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}
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backingstore->beginPaint(region);
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}
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void endPaint() override
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{
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backingstore->endPaint();
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}
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void flush(const QRegion ®ion) override
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{
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Q_Q(QRasterWindow);
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backingstore->flush(region, q);
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}
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QScopedPointer<QBackingStore> backingstore;
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};
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/*!
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Constructs a new QRasterWindow with \a parent.
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*/
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QRasterWindow::QRasterWindow(QWindow *parent)
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: QPaintDeviceWindow(*(new QRasterWindowPrivate), parent)
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{
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setSurfaceType(QSurface::RasterSurface);
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d_func()->backingstore.reset(new QBackingStore(this));
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}
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QRasterWindow::~QRasterWindow()
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{
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Q_D(QRasterWindow);
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// Delete backingstore while window is still alive, as it
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// might need to reference the window in the process
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d->backingstore.reset(nullptr);
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}
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/*!
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\internal
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*/
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int QRasterWindow::metric(PaintDeviceMetric metric) const
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{
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Q_D(const QRasterWindow);
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switch (metric) {
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case PdmDepth:
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return d->backingstore->paintDevice()->depth();
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default:
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break;
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}
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return QPaintDeviceWindow::metric(metric);
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}
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/*!
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\internal
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*/
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QPaintDevice *QRasterWindow::redirected(QPoint *) const
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{
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Q_D(const QRasterWindow);
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return d->backingstore->paintDevice();
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}
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QT_END_NAMESPACE
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#include "moc_qrasterwindow.cpp"
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