/usr/include/qgis/qgsmaprenderercache.h is in libqgis-dev 2.4.0-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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qgsmaprenderercache.h
--------------------------------------
Date : December 2013
Copyright : (C) 2013 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSMAPRENDERERCACHE_H
#define QGSMAPRENDERERCACHE_H
#include <QMap>
#include <QImage>
#include <QMutex>
#include "qgsrectangle.h"
/**
* This class is responsible for keeping cache of rendered images of individual layers.
*
* Once a layer has rendered image stored in the cache (using setCacheImage(...)),
* the cache listens to repaintRequested() signals from layer. If triggered, the cache
* removes the rendered image (and disconnects from the layer).
*
* The class is thread-safe (multiple classes can access the same instance safely).
*
* @note added in 2.4
*/
class CORE_EXPORT QgsMapRendererCache : public QObject
{
Q_OBJECT
public:
QgsMapRendererCache();
//! invalidate the cache contents
void clear();
//! initialize cache: set new parameters and erase cache if parameters have changed
//! @return flag whether the parameters are the same as last time
bool init( QgsRectangle extent, double scale );
//! set cached image for the specified layer ID
void setCacheImage( QString layerId, const QImage& img );
//! get cached image for the specified layer ID. Returns null image if it is not cached.
QImage cacheImage( QString layerId );
//! remove layer from the cache
void clearCacheImage( QString layerId );
protected slots:
//! remove layer (that emitted the signal) from the cache
void layerRequestedRepaint();
protected:
//! invalidate cache contents (without locking)
void clearInternal();
protected:
QMutex mMutex;
QgsRectangle mExtent;
double mScale;
QMap<QString, QImage> mCachedImages;
};
#endif // QGSMAPRENDERERCACHE_H
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