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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of Qt. It was originally
** published as part of Qt Quarterly.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QBuffer>
#include "imgrunnable.h"
MapImageRunnable::MapImageRunnable(const QImage &sourceImage, int zoom, int row,
int column)
: m_sourceImage(sourceImage), m_zoom(zoom), m_row(row), m_column(column)
{
}
void MapImageRunnable::run()
{
// The number of tiles along each axis is 2^zoom.
// zoom is a value from 0 to 4, so the number of tiles are 1 to 16.
int number = 1 << m_zoom;
// Divide the source image into 2^zoom by 2^zoom tiles.
int tileWidth = m_sourceImage.size().width() / number;
int tileHeight = m_sourceImage.size().height() / number;
// Calculate the coordinates for the top-left corner of the tile.
int tx = m_column * tileWidth;
int ty = m_row * tileHeight;
QImage tileImage = m_sourceImage.copy(tx, ty, tileWidth, tileHeight);
QImage scaledImage = tileImage.scaled(256, 256);
QByteArray data;
QBuffer buffer(&data);
buffer.open(QBuffer::WriteOnly);
scaledImage.save(&buffer, "PNG");
buffer.close();
emit finished(data);
}
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