qgsprojutils.h

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/***************************************************************************
                             qgsprojutils.h
                             -------------------
    begin                : March 2019
    copyright            : (C) 2019 by 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 QGSPROJUTILS_H
#define QGSPROJUTILS_H

#include <QtGlobal>

#include "qgis_core.h"
#include "qgsconfig.h"
#include "qgsdatumtransform.h"
#include <memory>
#include <QStringList>

#if !defined(USE_THREAD_LOCAL) || defined(Q_OS_WIN)
#include <QThreadStorage>
#endif

#if PROJ_VERSION_MAJOR>=6
#ifndef SIP_RUN
struct PJconsts;
typedef struct PJconsts PJ;
#endif
#endif

class CORE_EXPORT QgsProjUtils
{
  public:

    static int projVersionMajor()
    {
      return PROJ_VERSION_MAJOR;
    }

    static QStringList searchPaths();

#ifndef SIP_RUN
#if PROJ_VERSION_MAJOR >= 6

    struct ProjPJDeleter
    {

      void CORE_EXPORT operator()( PJ *object );

    };

    using proj_pj_unique_ptr = std::unique_ptr< PJ, ProjPJDeleter >;

    static bool usesAngularUnit( const QString &projDef );

    //TODO - remove when proj 6.1 is minimum supported version, and replace with proj_normalize_for_visualization

    static bool axisOrderIsSwapped( const PJ *crs );

    static proj_pj_unique_ptr crsToSingleCrs( const PJ *crs );

    static bool coordinateOperationIsAvailable( const QString &projDef );

    static QList< QgsDatumTransform::GridDetails > gridsUsed( const QString &proj );


#if 0 // not possible in current Proj 6 API

    static QStringList nonAvailableGrids( const QString &projDef );
#endif
#endif
#endif
};

#ifndef SIP_RUN

#if PROJ_VERSION_MAJOR>=6
struct projCtx_t;
typedef struct projCtx_t PJ_CONTEXT;
#else
typedef void PJ_CONTEXT;
#endif

class CORE_EXPORT QgsProjContext
{
  public:

    QgsProjContext();
    ~QgsProjContext();

    static PJ_CONTEXT *get();

  private:
    PJ_CONTEXT *mContext = nullptr;

#if defined(USE_THREAD_LOCAL) && !defined(Q_OS_WIN)
    static thread_local QgsProjContext sProjContext;
#else
    static QThreadStorage< QgsProjContext * > sProjContext;
#endif
};

#endif
#endif // QGSPROJUTILS_H