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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation ([email protected])
+**
+** 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 [email protected].
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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);
+}