142 lines
4.4 KiB
C++
142 lines
4.4 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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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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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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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 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 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 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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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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