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
 
    enum IdentifyFlag
    {
      FlagMatchBoundCrsToUnderlyingSourceCrs = 1 << 0, 
    };
    Q_DECLARE_FLAGS( IdentifyFlags, IdentifyFlag )
 
#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 identifyCrs( const PJ *crs, QString &authName, QString &authCode, IdentifyFlags flags = IdentifyFlags() );
 
    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
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS( QgsProjUtils::IdentifyFlags )
#endif
#endif // QGSPROJUTILS_H