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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/
#include "pathwidget.h"
#include <QtGui/qpainter.h>
PathWidget::PathWidget(QWidget *parent)
: QWidget(parent)
{
setAttribute(Qt::WA_OpaquePaintEvent);
if (!context.create())
qFatal("Could not create OpenCL context");
program = context.buildProgramFromSourceFile(QLatin1String(":/pathdrawing.cl"));
fillRectWithColor = program.createKernel("fillRectWithColor");
fillRectWithColor.setLocalWorkSize(8, 8);
}
PathWidget::~PathWidget()
{
}
void PathWidget::paintEvent(QPaintEvent *)
{
// Create a QCLImage2D object for the window surface.
QSize wsize = size();
if (wsize != windowSize)
surfaceImage = QCLImage2D();
if (surfaceImage.isNull()) {
windowSize = wsize;
surfaceImage = context.createImage2DDevice
(QImage::Format_RGB32, windowSize, QCLMemoryObject::ReadWrite);
}
// Clear to the background color.
QColor bgcolor = palette().color(backgroundRole());
fillRect(0, 0, wsize.width(), wsize.height(), bgcolor);
// Draw a rectangle at 150, 100.
fillRect(150, 100, 300, 200, Qt::black);
// Draw the window surface image to the actual window.
QPainter painter(this);
surfaceImage.drawImage(&painter, QPoint(0, 0));
}
void PathWidget::fillRect(int x, int y, int width, int height,
const QColor& color)
{
// Round up the global work size so we can process the
// rectangle in 8x8 local work size units. The kernel will
// ignore pixels that are outside the rectangle limits.
fillRectWithColor.setGlobalWorkSize((width + 7) & ~7, (height + 7) & ~7);
fillRectWithColor(surfaceImage, x, y, x + width, y + height, color);
}
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