qgscoordinatetransform_p.h

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/***************************************************************************
               qgscoordinatetransform_p.h
               --------------------------
    begin                : July 2016
    copyright            : (C) 2016 Nyall Dawson
    email                : nyall dot dawson 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 QGSCOORDINATETRANSFORMPRIVATE_H
#define QGSCOORDINATETRANSFORMPRIVATE_H

#define SIP_NO_FILE
#include "qgsconfig.h"


//
//  W A R N I N G
//  -------------
//
// This file is not part of the QGIS API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//

#include <QSharedData>

#ifndef USE_THREAD_LOCAL
#include <QThreadStorage>
#endif

#include "qgscoordinatereferencesystem.h"
#include "qgscoordinatetransformcontext.h"

typedef void *projPJ;
typedef void *projCtx;

class QgsProjContextStore
{
  public:

    QgsProjContextStore();
    ~QgsProjContextStore();

    projCtx get() { return context; }

  private:
    projCtx context;
};

class QgsCoordinateTransformPrivate : public QSharedData
{

  public:

    explicit QgsCoordinateTransformPrivate();

    QgsCoordinateTransformPrivate( const QgsCoordinateReferenceSystem &source,
                                   const QgsCoordinateReferenceSystem &destination,
                                   const QgsCoordinateTransformContext &context );

    QgsCoordinateTransformPrivate( const QgsCoordinateReferenceSystem &source,
                                   const QgsCoordinateReferenceSystem &destination,
                                   int sourceDatumTransform,
                                   int destDatumTransform );

    QgsCoordinateTransformPrivate( const QgsCoordinateTransformPrivate &other );

    ~QgsCoordinateTransformPrivate();

    bool checkValidity();

    void invalidate();

    bool initialize();

    void calculateTransforms( const QgsCoordinateTransformContext &context );

    QPair< projPJ, projPJ > threadLocalProjData();

    bool mIsValid = false;

    bool mShortCircuit = false;

    QgsCoordinateReferenceSystem mSourceCRS;

    QgsCoordinateReferenceSystem mDestCRS;

    QString mSourceProjString;
    QString mDestProjString;

    int mSourceDatumTransform = -1;
    int mDestinationDatumTransform = -1;

#ifdef USE_THREAD_LOCAL
    static thread_local QgsProjContextStore mProjContext;
#else
    static QThreadStorage< QgsProjContextStore * > mProjContext;
#endif

    QReadWriteLock mProjLock;
    QMap < uintptr_t, QPair< projPJ, projPJ > > mProjProjections;

  private:

    QString stripDatumTransform( const QString &proj4 ) const;

    void addNullGridShifts( QString &srcProjString, QString &destProjString, int sourceDatumTransform, int destinationDatumTransform ) const;

    void setFinder();

    void freeProj();
};


#endif // QGSCOORDINATETRANSFORMPRIVATE_H