C

Telltales: Rendering Safety-Critical UI

/**************************************************************************** ** ** Copyright (C) 2020 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the Qt Safe Renderer module ** ** $QT_BEGIN_LICENSE:GPL-EXCEPT$ ** 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 https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3 as published by the Free Software ** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/
#include "rasterwindow.h" RasterWindow::RasterWindow(const QSafeSize &size, QWindow *parent) :QWindow(parent) ,AbstractWindow(size) ,m_buffer(size) { m_backingStore = new QBackingStore(this); create(); resize(static_cast<int>(size.width()), static_cast<int>(size.height())); QSurfaceFormat fmt = format(); fmt.setAlphaBufferSize(8); setFormat(fmt); } bool RasterWindow::event(QEvent *event) { if (event->type() == QEvent::UpdateRequest) { renderNow(); return true; } return QWindow::event(event); } void RasterWindow::renderLater() { requestUpdate(); } void RasterWindow::resizeEvent(QResizeEvent *resizeEvent) { if (m_backingStore) { m_backingStore->resize(resizeEvent->size()); renderNow(); } } void RasterWindow::exposeEvent(QExposeEvent *) { renderNow(); } void RasterWindow::render(const Rect &dirtyArea) { (void)dirtyArea; renderNow(); } void RasterWindow::renderNow() { if (!isExposed()) return; QRect rect(0, 0, width(), height()); m_backingStore->beginPaint(rect); QPaintDevice *device = m_backingStore->paintDevice(); QPainter painter(device); painter.fillRect(0, 0, width(), height(), Qt::black); render(&painter); m_backingStore->endPaint(); m_backingStore->flush(rect); } void RasterWindow::render(QPainter *painter) { QRect rect(0, 0, width(), height()); painter->drawImage(rect, m_buffer.image()); painter->end(); }