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Diffstat (limited to 'GeoServicesExample/mapimageplugin/imgrunnable.cpp')
-rw-r--r-- | GeoServicesExample/mapimageplugin/imgrunnable.cpp | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/GeoServicesExample/mapimageplugin/imgrunnable.cpp b/GeoServicesExample/mapimageplugin/imgrunnable.cpp new file mode 100644 index 0000000..04bffcd --- /dev/null +++ b/GeoServicesExample/mapimageplugin/imgrunnable.cpp @@ -0,0 +1,76 @@ +/**************************************************************************** +** +** 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); +} |