/usr/include/qgis/qgscrscache.h is in libqgis-dev 2.8.6+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
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qgscrscache.h
--------------
begin : September 6th, 2011
copyright : (C) 2011 by Marco Hugentobler
email : marco dot hugentobler at sourcepole dot ch
***************************************************************************/
/***************************************************************************
* *
* 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 QGSCRSCACHE_H
#define QGSCRSCACHE_H
#include "qgscoordinatereferencesystem.h"
#include "qgssingleton.h"
#include <QHash>
class QgsCoordinateTransform;
/**Cache coordinate transform by authid of source/dest transformation to avoid the
overhead of initialisation for each redraw*/
class CORE_EXPORT QgsCoordinateTransformCache : public QgsSingleton<QgsCoordinateTransformCache>
{
public:
~QgsCoordinateTransformCache();
/**Returns coordinate transformation. Cache keeps ownership
@param srcAuthId auth id string of source crs
@param destAuthId auth id string of dest crs
@param srcDatumTransform id of source's datum transform
@param destDatumTransform id of destinations's datum transform
*/
const QgsCoordinateTransform* transform( const QString& srcAuthId, const QString& destAuthId, int srcDatumTransform = -1, int destDatumTransform = -1 );
/**Removes transformations where a changed crs is involved from the cache*/
void invalidateCrs( const QString& crsAuthId );
private:
QMultiHash< QPair< QString, QString >, QgsCoordinateTransform* > mTransforms; //same auth_id pairs might have different datum transformations
};
class CORE_EXPORT QgsCRSCache
{
public:
static QgsCRSCache* instance();
~QgsCRSCache();
/**Returns the CRS for authid, e.g. 'EPSG:4326' (or an invalid CRS in case of error)*/
const QgsCoordinateReferenceSystem& crsByAuthId( const QString& authid );
const QgsCoordinateReferenceSystem& crsByEpsgId( long epsg );
void updateCRSCache( const QString &authid );
protected:
QgsCRSCache();
private:
QHash< QString, QgsCoordinateReferenceSystem > mCRS;
/**CRS that is not initialised (returned in case of error)*/
QgsCoordinateReferenceSystem mInvalidCRS;
};
#endif // QGSCRSCACHE_H
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