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qgscoordinatereferencesystem.cpp
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qgscoordinatereferencesystem.cpp
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/***************************************************************************
qgscoordinatereferencesystem.cpp
-------------------
begin : 2007
copyright : (C) 2007 by Gary E. Sherman
email : sherman@mrcc.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. *
* *
***************************************************************************/
#include "qgscoordinatereferencesystem.h"
#include "qgscoordinatereferencesystem_p.h"
#include "qgscoordinatereferencesystem_legacy.h"
#include "qgsreadwritelocker.h"
#include <cmath>
#include <QDir>
#include <QDomNode>
#include <QDomElement>
#include <QFileInfo>
#include <QRegExp>
#include <QTextStream>
#include <QFile>
#include <QRegularExpression>
#include "qgsapplication.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgis.h" //const vals declared here
#include "qgslocalec.h"
#include "qgssettings.h"
#include "qgsogrutils.h"
#include <sqlite3.h>
#if PROJ_VERSION_MAJOR>=6
#include "qgsprojutils.h"
#include <proj.h>
#include <proj_experimental.h>
#else
#include <proj_api.h>
#endif
//gdal and ogr includes (needed for == operator)
#include <ogr_srs_api.h>
#include <cpl_error.h>
#include <cpl_conv.h>
#include <cpl_csv.h>
//! The length of the string "+lat_1="
const int LAT_PREFIX_LEN = 7;
CUSTOM_CRS_VALIDATION QgsCoordinateReferenceSystem::sCustomSrsValidation = nullptr;
QReadWriteLock QgsCoordinateReferenceSystem::sSrIdCacheLock;
QHash< long, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sSrIdCache;
bool QgsCoordinateReferenceSystem::sDisableSrIdCache = false;
QReadWriteLock QgsCoordinateReferenceSystem::sOgcLock;
QHash< QString, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sOgcCache;
bool QgsCoordinateReferenceSystem::sDisableOgcCache = false;
QReadWriteLock QgsCoordinateReferenceSystem::sProj4CacheLock;
QHash< QString, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sProj4Cache;
bool QgsCoordinateReferenceSystem::sDisableProj4Cache = false;
QReadWriteLock QgsCoordinateReferenceSystem::sCRSWktLock;
QHash< QString, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sWktCache;
bool QgsCoordinateReferenceSystem::sDisableWktCache = false;
QReadWriteLock QgsCoordinateReferenceSystem::sCRSSrsIdLock;
QHash< long, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sSrsIdCache;
bool QgsCoordinateReferenceSystem::sDisableSrsIdCache = false;
QReadWriteLock QgsCoordinateReferenceSystem::sCrsStringLock;
QHash< QString, QgsCoordinateReferenceSystem > QgsCoordinateReferenceSystem::sStringCache;
bool QgsCoordinateReferenceSystem::sDisableStringCache = false;
#if PROJ_VERSION_MAJOR>=6
QString getFullProjString( PJ *obj )
{
// see https://lists.osgeo.org/pipermail/proj/2019-May/008565.html, it's not sufficient to just
// use proj_as_proj_string
QgsProjUtils::proj_pj_unique_ptr boundCrs( proj_crs_create_bound_crs_to_WGS84( QgsProjContext::get(), obj, nullptr ) );
if ( boundCrs )
{
if ( const char *proj4src = proj_as_proj_string( QgsProjContext::get(), boundCrs.get(), PJ_PROJ_4, nullptr ) )
{
return QString( proj4src );
}
}
return QString( proj_as_proj_string( QgsProjContext::get(), obj, PJ_PROJ_4, nullptr ) );
}
#endif
//--------------------------
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem()
{
d = new QgsCoordinateReferenceSystemPrivate();
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const QString &definition )
{
d = new QgsCoordinateReferenceSystemPrivate();
createFromString( definition );
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const long id, CrsType type )
{
d = new QgsCoordinateReferenceSystemPrivate();
Q_NOWARN_DEPRECATED_PUSH
createFromId( id, type );
Q_NOWARN_DEPRECATED_POP
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const QgsCoordinateReferenceSystem &srs ) //NOLINT
: d( srs.d )
, mValidationHint( srs.mValidationHint )
{
}
QgsCoordinateReferenceSystem &QgsCoordinateReferenceSystem::operator=( const QgsCoordinateReferenceSystem &srs ) //NOLINT
{
d = srs.d;
mValidationHint = srs.mValidationHint;
return *this;
}
QList<long> QgsCoordinateReferenceSystem::validSrsIds()
{
QList<long> results;
// check both standard & user defined projection databases
QStringList dbs = QStringList() << QgsApplication::srsDatabaseFilePath() << QgsApplication::qgisUserDatabaseFilePath();
const auto constDbs = dbs;
for ( const QString &db : constDbs )
{
QFileInfo myInfo( db );
if ( !myInfo.exists() )
{
QgsDebugMsg( "failed : " + db + " does not exist!" );
continue;
}
sqlite3_database_unique_ptr database;
sqlite3_statement_unique_ptr statement;
//check the db is available
int result = openDatabase( db, database );
if ( result != SQLITE_OK )
{
QgsDebugMsg( "failed : " + db + " could not be opened!" );
continue;
}
QString sql = QStringLiteral( "select srs_id from tbl_srs" );
int rc;
statement = database.prepare( sql, rc );
while ( true )
{
// this one is an infinitive loop, intended to fetch any row
int ret = statement.step();
if ( ret == SQLITE_DONE )
{
// there are no more rows to fetch - we can stop looping
break;
}
if ( ret == SQLITE_ROW )
{
results.append( statement.columnAsInt64( 0 ) );
}
else
{
QgsMessageLog::logMessage( QObject::tr( "SQLite error: %2\nSQL: %1" ).arg( sql, sqlite3_errmsg( database.get() ) ), QObject::tr( "SpatiaLite" ) );
break;
}
}
}
std::sort( results.begin(), results.end() );
return results;
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromOgcWmsCrs( const QString &ogcCrs )
{
QgsCoordinateReferenceSystem crs;
crs.createFromOgcWmsCrs( ogcCrs );
return crs;
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromEpsgId( long epsg )
{
QgsCoordinateReferenceSystem res = fromOgcWmsCrs( "EPSG:" + QString::number( epsg ) );
if ( res.isValid() )
return res;
// pre proj6 builds allowed use of ESRI: codes here (e.g. 54030), so we need to keep compatibility
res = fromOgcWmsCrs( "ESRI:" + QString::number( epsg ) );
if ( res.isValid() )
return res;
return QgsCoordinateReferenceSystem();
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromProj4( const QString &proj4 )
{
return fromProj( proj4 );
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromProj( const QString &proj )
{
QgsCoordinateReferenceSystem crs;
crs.createFromProj( proj );
return crs;
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromWkt( const QString &wkt )
{
QgsCoordinateReferenceSystem crs;
crs.createFromWkt( wkt );
return crs;
}
QgsCoordinateReferenceSystem QgsCoordinateReferenceSystem::fromSrsId( long srsId )
{
QgsCoordinateReferenceSystem crs;
crs.createFromSrsId( srsId );
return crs;
}
QgsCoordinateReferenceSystem::~QgsCoordinateReferenceSystem() //NOLINT
{
}
bool QgsCoordinateReferenceSystem::createFromId( const long id, CrsType type )
{
bool result = false;
switch ( type )
{
case InternalCrsId:
result = createFromSrsId( id );
break;
case PostgisCrsId:
result = createFromPostgisSrid( id );
break;
case EpsgCrsId:
result = createFromOgcWmsCrs( QStringLiteral( "EPSG:%1" ).arg( id ) );
break;
default:
//THIS IS BAD...THIS PART OF CODE SHOULD NEVER BE REACHED...
QgsDebugMsg( QStringLiteral( "Unexpected case reached!" ) );
};
return result;
}
bool QgsCoordinateReferenceSystem::createFromString( const QString &definition )
{
QgsReadWriteLocker locker( sCrsStringLock, QgsReadWriteLocker::Read );
if ( !sDisableStringCache )
{
QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = sStringCache.constFind( definition );
if ( crsIt != sStringCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
return true;
}
}
locker.unlock();
bool result = false;
QRegularExpression reCrsId( QStringLiteral( "^(epsg|esri|osgeo|ignf|zangi|iau2000|postgis|internal|user)\\:(\\w+)$" ), QRegularExpression::CaseInsensitiveOption );
QRegularExpressionMatch match = reCrsId.match( definition );
if ( match.capturedStart() == 0 )
{
QString authName = match.captured( 1 ).toLower();
if ( authName == QLatin1String( "epsg" ) )
{
result = createFromOgcWmsCrs( definition );
}
else if ( authName == QLatin1String( "postgis" ) )
{
const long id = match.captured( 2 ).toLong();
result = createFromPostgisSrid( id );
}
else if ( authName == QLatin1String( "esri" ) || authName == QLatin1String( "osgeo" ) || authName == QLatin1String( "ignf" ) || authName == QLatin1String( "zangi" ) || authName == QLatin1String( "iau2000" ) )
{
result = createFromOgcWmsCrs( definition );
}
else
{
const long id = match.captured( 2 ).toLong();
Q_NOWARN_DEPRECATED_PUSH
result = createFromId( id, InternalCrsId );
Q_NOWARN_DEPRECATED_POP
}
}
else
{
QRegularExpression reCrsStr( "^(?:(wkt|proj4)\\:)?(.+)$", QRegularExpression::CaseInsensitiveOption );
match = reCrsStr.match( definition );
if ( match.capturedStart() == 0 )
{
if ( match.captured( 1 ).compare( QLatin1String( "proj4" ), Qt::CaseInsensitive ) == 0 )
{
result = createFromProj( match.captured( 2 ) );
}
else
{
result = createFromWkt( match.captured( 2 ) );
}
}
}
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableStringCache )
sStringCache.insert( definition, *this );
return result;
}
bool QgsCoordinateReferenceSystem::createFromUserInput( const QString &definition )
{
QString userWkt;
OGRSpatialReferenceH crs = OSRNewSpatialReference( nullptr );
#if PROJ_VERSION_MAJOR<6
// make sure towgs84 parameter is loaded if using an ESRI definition and gdal >= 1.9
if ( definition.startsWith( QLatin1String( "ESRI::" ) ) )
{
Q_NOWARN_DEPRECATED_PUSH
setupESRIWktFix();
Q_NOWARN_DEPRECATED_POP
}
#endif
if ( OSRSetFromUserInput( crs, definition.toLocal8Bit().constData() ) == OGRERR_NONE )
{
userWkt = QgsOgrUtils::OGRSpatialReferenceToWkt( crs );
OSRDestroySpatialReference( crs );
}
//QgsDebugMsg( "definition: " + definition + " wkt = " + wkt );
return createFromWkt( userWkt );
}
void QgsCoordinateReferenceSystem::setupESRIWktFix()
{
// make sure towgs84 parameter is loaded if gdal >= 1.9
// this requires setting GDAL_FIX_ESRI_WKT=GEOGCS (see qgis bug #5598 and gdal bug #4673)
const char *configOld = CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" );
const char *configNew = "GEOGCS";
// only set if it was not set, to let user change the value if needed
if ( strcmp( configOld, "" ) == 0 )
{
CPLSetConfigOption( "GDAL_FIX_ESRI_WKT", configNew );
if ( strcmp( configNew, CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" ) ) != 0 )
QgsLogger::warning( QStringLiteral( "GDAL_FIX_ESRI_WKT could not be set to %1 : %2" )
.arg( configNew, CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" ) ) );
QgsDebugMsgLevel( QStringLiteral( "set GDAL_FIX_ESRI_WKT : %1" ).arg( configNew ), 4 );
}
else
{
QgsDebugMsgLevel( QStringLiteral( "GDAL_FIX_ESRI_WKT was already set : %1" ).arg( configNew ), 4 );
}
}
bool QgsCoordinateReferenceSystem::createFromOgcWmsCrs( const QString &crs )
{
QgsReadWriteLocker locker( sOgcLock, QgsReadWriteLocker::Read );
if ( !sDisableOgcCache )
{
QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = sOgcCache.constFind( crs );
if ( crsIt != sOgcCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
return true;
}
}
locker.unlock();
QString wmsCrs = crs;
QRegExp re_uri( "http://www\\.opengis\\.net/def/crs/([^/]+).+/([^/]+)", Qt::CaseInsensitive );
QRegExp re_urn( "urn:ogc:def:crs:([^:]+).+([^:]+)", Qt::CaseInsensitive );
if ( re_uri.exactMatch( wmsCrs ) )
{
wmsCrs = re_uri.cap( 1 ) + ':' + re_uri.cap( 2 );
}
else if ( re_urn.exactMatch( wmsCrs ) )
{
wmsCrs = re_urn.cap( 1 ) + ':' + re_urn.cap( 2 );
}
else
{
re_urn.setPattern( QStringLiteral( "(user|custom|qgis):(\\d+)" ) );
if ( re_urn.exactMatch( wmsCrs ) && createFromSrsId( re_urn.cap( 2 ).toInt() ) )
{
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableOgcCache )
sOgcCache.insert( crs, *this );
return true;
}
}
#if PROJ_VERSION_MAJOR>=6
// first chance for proj 6 - scan through legacy systems and try to use authid directly
const QString legacyKey = wmsCrs.toLower();
for ( auto it = sAuthIdToQgisSrsIdMap.constBegin(); it != sAuthIdToQgisSrsIdMap.constEnd(); ++it )
{
if ( it.key().compare( legacyKey, Qt::CaseInsensitive ) == 0 )
{
const QStringList parts = it.key().split( ':' );
const QString auth = parts.at( 0 );
const QString code = parts.at( 1 );
if ( loadFromAuthCode( auth, code ) )
{
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableOgcCache )
sOgcCache.insert( crs, *this );
return true;
}
}
}
#endif
if ( loadFromDatabase( QgsApplication::srsDatabaseFilePath(), QStringLiteral( "lower(auth_name||':'||auth_id)" ), wmsCrs.toLower() ) )
{
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableOgcCache )
sOgcCache.insert( crs, *this );
return true;
}
// NAD27
if ( wmsCrs.compare( QLatin1String( "CRS:27" ), Qt::CaseInsensitive ) == 0 ||
wmsCrs.compare( QLatin1String( "OGC:CRS27" ), Qt::CaseInsensitive ) == 0 )
{
// TODO: verify same axis orientation
return createFromOgcWmsCrs( QStringLiteral( "EPSG:4267" ) );
}
// NAD83
if ( wmsCrs.compare( QLatin1String( "CRS:83" ), Qt::CaseInsensitive ) == 0 ||
wmsCrs.compare( QLatin1String( "OGC:CRS83" ), Qt::CaseInsensitive ) == 0 )
{
// TODO: verify same axis orientation
return createFromOgcWmsCrs( QStringLiteral( "EPSG:4269" ) );
}
// WGS84
if ( wmsCrs.compare( QLatin1String( "CRS:84" ), Qt::CaseInsensitive ) == 0 ||
wmsCrs.compare( QLatin1String( "OGC:CRS84" ), Qt::CaseInsensitive ) == 0 )
{
if ( loadFromDatabase( QgsApplication::srsDatabaseFilePath(), QStringLiteral( "lower(auth_name||':'||auth_id)" ), QStringLiteral( "epsg:4326" ) ) )
{
d->mAxisInverted = false;
d->mAxisInvertedDirty = false;
}
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableOgcCache )
sOgcCache.insert( crs, *this );
return d->mIsValid;
}
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableOgcCache )
sOgcCache.insert( crs, QgsCoordinateReferenceSystem() );
return false;
}
// Misc helper functions -----------------------
void QgsCoordinateReferenceSystem::validate()
{
if ( d->mIsValid || !sCustomSrsValidation )
return;
// try to validate using custom validation routines
if ( sCustomSrsValidation )
sCustomSrsValidation( *this );
}
bool QgsCoordinateReferenceSystem::createFromSrid( const long id )
{
return createFromPostgisSrid( id );
}
bool QgsCoordinateReferenceSystem::createFromPostgisSrid( const long id )
{
QgsReadWriteLocker locker( sSrIdCacheLock, QgsReadWriteLocker::Read );
if ( !sDisableSrIdCache )
{
QHash< long, QgsCoordinateReferenceSystem >::const_iterator crsIt = sSrIdCache.constFind( id );
if ( crsIt != sSrIdCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
return true;
}
}
locker.unlock();
#if PROJ_VERSION_MAJOR>=6
// first chance for proj 6 - scan through legacy systems and try to use authid directly
for ( auto it = sAuthIdToQgisSrsIdMap.constBegin(); it != sAuthIdToQgisSrsIdMap.constEnd(); ++it )
{
if ( it.value().endsWith( QStringLiteral( ",%1" ).arg( id ) ) )
{
const QStringList parts = it.key().split( ':' );
const QString auth = parts.at( 0 );
const QString code = parts.at( 1 );
if ( loadFromAuthCode( auth, code ) )
{
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableSrIdCache )
sSrIdCache.insert( id, *this );
return true;
}
}
}
#endif
bool result = loadFromDatabase( QgsApplication::srsDatabaseFilePath(), QStringLiteral( "srid" ), QString::number( id ) );
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableSrIdCache )
sSrIdCache.insert( id, *this );
return result;
}
bool QgsCoordinateReferenceSystem::createFromSrsId( const long id )
{
QgsReadWriteLocker locker( sCRSSrsIdLock, QgsReadWriteLocker::Read );
if ( !sDisableSrsIdCache )
{
QHash< long, QgsCoordinateReferenceSystem >::const_iterator crsIt = sSrsIdCache.constFind( id );
if ( crsIt != sSrsIdCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
return true;
}
}
locker.unlock();
#if PROJ_VERSION_MAJOR>=6
// first chance for proj 6 - scan through legacy systems and try to use authid directly
for ( auto it = sAuthIdToQgisSrsIdMap.constBegin(); it != sAuthIdToQgisSrsIdMap.constEnd(); ++it )
{
if ( it.value().startsWith( QString::number( id ) + ',' ) )
{
const QStringList parts = it.key().split( ':' );
const QString auth = parts.at( 0 );
const QString code = parts.at( 1 );
if ( loadFromAuthCode( auth, code ) )
{
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableSrsIdCache )
sSrsIdCache.insert( id, *this );
return true;
}
}
}
#endif
bool result = loadFromDatabase( id < USER_CRS_START_ID ? QgsApplication::srsDatabaseFilePath() :
QgsApplication::qgisUserDatabaseFilePath(),
QStringLiteral( "srs_id" ), QString::number( id ) );
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableSrsIdCache )
sSrsIdCache.insert( id, *this );
return result;
}
bool QgsCoordinateReferenceSystem::loadFromDatabase( const QString &db, const QString &expression, const QString &value )
{
d.detach();
QgsDebugMsgLevel( "load CRS from " + db + " where " + expression + " is " + value, 3 );
d->mIsValid = false;
QFileInfo myInfo( db );
if ( !myInfo.exists() )
{
QgsDebugMsg( "failed : " + db + " does not exist!" );
return d->mIsValid;
}
sqlite3_database_unique_ptr database;
sqlite3_statement_unique_ptr statement;
int myResult;
//check the db is available
myResult = openDatabase( db, database );
if ( myResult != SQLITE_OK )
{
return d->mIsValid;
}
/*
srs_id INTEGER PRIMARY KEY,
description text NOT NULL,
projection_acronym text NOT NULL,
ellipsoid_acronym NOT NULL,
parameters text NOT NULL,
srid integer NOT NULL,
auth_name varchar NOT NULL,
auth_id integer NOT NULL,
is_geo integer NOT NULL);
*/
QString mySql = "select srs_id,description,projection_acronym,"
"ellipsoid_acronym,parameters,srid,auth_name||':'||auth_id,is_geo,wkt "
"from tbl_srs where " + expression + '=' + QgsSqliteUtils::quotedString( value ) + " order by deprecated";
statement = database.prepare( mySql, myResult );
QString wkt;
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK && statement.step() == SQLITE_ROW )
{
d->mSrsId = statement.columnAsText( 0 ).toLong();
d->mDescription = statement.columnAsText( 1 );
d->mProjectionAcronym = statement.columnAsText( 2 );
#if PROJ_VERSION_MAJOR>=6
d->mEllipsoidAcronym.clear();
#else
d->mEllipsoidAcronym = statement.columnAsText( 3 );
#endif
d->mProj4 = statement.columnAsText( 4 );
d->mSRID = statement.columnAsText( 5 ).toLong();
d->mAuthId = statement.columnAsText( 6 );
d->mIsGeographic = statement.columnAsText( 7 ).toInt() != 0;
wkt = statement.columnAsText( 8 );
d->mAxisInvertedDirty = true;
if ( d->mSrsId >= USER_CRS_START_ID && d->mAuthId.isEmpty() )
{
d->mAuthId = QStringLiteral( "USER:%1" ).arg( d->mSrsId );
}
else if ( !d->mAuthId.startsWith( QLatin1String( "USER:" ), Qt::CaseInsensitive ) )
{
#if PROJ_VERSION_MAJOR>=6
QStringList parts = d->mAuthId.split( ':' );
QString auth = parts.at( 0 );
QString code = parts.at( 1 );
{
QgsProjUtils::proj_pj_unique_ptr crs( proj_create_from_database( QgsProjContext::get(), auth.toLatin1(), code.toLatin1(), PJ_CATEGORY_CRS, false, nullptr ) );
d->setPj( QgsProjUtils::crsToSingleCrs( crs.get() ) );
}
d->mIsValid = d->hasPj();
#else
OSRDestroySpatialReference( d->mCRS );
d->mCRS = OSRNewSpatialReference( nullptr );
d->mIsValid = OSRSetFromUserInput( d->mCRS, d->mAuthId.toLower().toLatin1() ) == OGRERR_NONE;
#endif
setMapUnits();
}
if ( !d->mIsValid )
{
if ( !wkt.isEmpty() )
setWktString( wkt, false );
else
setProjString( d->mProj4 );
}
}
else
{
QgsDebugMsgLevel( "failed : " + mySql, 4 );
}
return d->mIsValid;
}
#if PROJ_VERSION_MAJOR>=6
void QgsCoordinateReferenceSystem::removeFromCacheObjectsBelongingToCurrentThread( PJ_CONTEXT *pj_context )
{
// Not completely sure about object order destruction after main() has
// exited. So it is safer to check sDisableCache before using sCacheLock
// in case sCacheLock would have been destroyed before the current TLS
// QgsProjContext object that has called us...
if ( !sDisableSrIdCache )
{
QgsReadWriteLocker locker( sSrIdCacheLock, QgsReadWriteLocker::Write );
if ( !sDisableSrIdCache )
{
for ( auto it = sSrIdCache.begin(); it != sSrIdCache.end(); )
{
auto &v = it.value();
if ( v.d->removeObjectsBelongingToCurrentThread( pj_context ) )
it = sSrIdCache.erase( it );
else
++it;
}
}
}
if ( !sDisableOgcCache )
{
QgsReadWriteLocker locker( sOgcLock, QgsReadWriteLocker::Write );
if ( !sDisableOgcCache )
{
for ( auto it = sOgcCache.begin(); it != sOgcCache.end(); )
{
auto &v = it.value();
if ( v.d->removeObjectsBelongingToCurrentThread( pj_context ) )
it = sOgcCache.erase( it );
else
++it;
}
}
}
if ( !sDisableProj4Cache )
{
QgsReadWriteLocker locker( sProj4CacheLock, QgsReadWriteLocker::Write );
if ( !sDisableProj4Cache )
{
for ( auto it = sProj4Cache.begin(); it != sProj4Cache.end(); )
{
auto &v = it.value();
if ( v.d->removeObjectsBelongingToCurrentThread( pj_context ) )
it = sProj4Cache.erase( it );
else
++it;
}
}
}
if ( !sDisableWktCache )
{
QgsReadWriteLocker locker( sCRSWktLock, QgsReadWriteLocker::Write );
if ( !sDisableWktCache )
{
for ( auto it = sWktCache.begin(); it != sWktCache.end(); )
{
auto &v = it.value();
if ( v.d->removeObjectsBelongingToCurrentThread( pj_context ) )
it = sWktCache.erase( it );
else
++it;
}
}
}
if ( !sDisableSrsIdCache )
{
QgsReadWriteLocker locker( sCRSSrsIdLock, QgsReadWriteLocker::Write );
if ( !sDisableSrsIdCache )
{
for ( auto it = sSrsIdCache.begin(); it != sSrsIdCache.end(); )
{
auto &v = it.value();
if ( v.d->removeObjectsBelongingToCurrentThread( pj_context ) )
it = sSrsIdCache.erase( it );
else
++it;
}
}
}
if ( !sDisableStringCache )
{
QgsReadWriteLocker locker( sCrsStringLock, QgsReadWriteLocker::Write );
if ( !sDisableStringCache )
{
for ( auto it = sStringCache.begin(); it != sStringCache.end(); )
{
auto &v = it.value();
if ( v.d->removeObjectsBelongingToCurrentThread( pj_context ) )
it = sStringCache.erase( it );
else
++it;
}
}
}
}
#endif
bool QgsCoordinateReferenceSystem::hasAxisInverted() const
{
if ( d->mAxisInvertedDirty )
{
#if PROJ_VERSION_MAJOR>=6
d->mAxisInverted = QgsProjUtils::axisOrderIsSwapped( d->threadLocalProjObject() );
#else
OGRAxisOrientation orientation;
OSRGetAxis( d->mCRS, OSRIsGeographic( d->mCRS ) ? "GEOGCS" : "PROJCS", 0, &orientation );
// If axis orientation is unknown, try again with OSRImportFromEPSGA for EPSG crs
if ( orientation == OAO_Other && d->mAuthId.startsWith( QLatin1String( "EPSG:" ), Qt::CaseInsensitive ) )
{
OGRSpatialReferenceH crs = OSRNewSpatialReference( nullptr );
if ( OSRImportFromEPSGA( crs, d->mAuthId.midRef( 5 ).toInt() ) == OGRERR_NONE )
{
OSRGetAxis( crs, OSRIsGeographic( crs ) ? "GEOGCS" : "PROJCS", 0, &orientation );
}
OSRDestroySpatialReference( crs );
}
d->mAxisInverted = orientation == OAO_North;
#endif
d->mAxisInvertedDirty = false;
}
return d->mAxisInverted;
}
bool QgsCoordinateReferenceSystem::createFromWkt( const QString &wkt )
{
d.detach();
QgsReadWriteLocker locker( sCRSWktLock, QgsReadWriteLocker::Read );
if ( !sDisableWktCache )
{
QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = sWktCache.constFind( wkt );
if ( crsIt != sWktCache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
return true;
}
}
locker.unlock();
d->mIsValid = false;
d->mProj4.clear();
if ( wkt.isEmpty() )
{
QgsDebugMsgLevel( QStringLiteral( "theWkt is uninitialized, operation failed" ), 4 );
return d->mIsValid;
}
// try to match against user crs
QgsCoordinateReferenceSystem::RecordMap record = getRecord( "select * from tbl_srs where wkt=" + QgsSqliteUtils::quotedString( wkt ) + " order by deprecated" );
if ( !record.empty() )
{
long srsId = record[QStringLiteral( "srs_id" )].toLong();
if ( srsId > 0 )
{
createFromSrsId( srsId );
}
}
else
{
setWktString( wkt );
if ( d->mSrsId == 0 )
{
#if PROJ_VERSION_MAJOR>=6
// lastly, try a tolerant match of the created proj object against all user CRSes (allowing differences in parameter order during the comparison)
long id = matchToUserCrs();
if ( id >= USER_CRS_START_ID )
{
createFromSrsId( id );
}
#endif
}
}
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableWktCache )
sWktCache.insert( wkt, *this );
return d->mIsValid;
//setMapunits will be called by createfromproj above
}
bool QgsCoordinateReferenceSystem::isValid() const
{
return d->mIsValid;
}
bool QgsCoordinateReferenceSystem::createFromProj4( const QString &proj4String )
{
return createFromProj( proj4String );
}
bool QgsCoordinateReferenceSystem::createFromProj( const QString &projString )
{
d.detach();
if ( projString.trimmed().isEmpty() )
{
d->mIsValid = false;
d->mProj4.clear();
return false;
}
QgsReadWriteLocker locker( sProj4CacheLock, QgsReadWriteLocker::Read );
if ( !sDisableProj4Cache )
{
QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = sProj4Cache.constFind( projString );
if ( crsIt != sProj4Cache.constEnd() )
{
// found a match in the cache
*this = crsIt.value();
return true;
}
}
locker.unlock();
//
// Examples:
// +proj=tmerc +lat_0=0 +lon_0=-62 +k=0.999500 +x_0=400000 +y_0=0
// +ellps=clrk80 +towgs84=-255,-15,71,0,0,0,0 +units=m +no_defs
//
// +proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=2.337229166666664 +k_0=0.99987742
// +x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515.000000472 +units=m +no_defs
//
QString myProj4String = projString.trimmed();
myProj4String.remove( QStringLiteral( "+type=crs" ) );
myProj4String = myProj4String.trimmed();
d->mIsValid = false;
#if PROJ_VERSION_MAJOR>=6
// first, try to use proj to do this for us...
const QString projCrsString = myProj4String + ( myProj4String.contains( QStringLiteral( "+type=crs" ) ) ? QString() : QStringLiteral( " +type=crs" ) );
QgsProjUtils::proj_pj_unique_ptr crs( proj_create( QgsProjContext::get(), projCrsString.toLatin1().constData() ) );
if ( crs )
{
QString authName;
QString authCode;
if ( QgsProjUtils::identifyCrs( crs.get(), authName, authCode, QgsProjUtils::FlagMatchBoundCrsToUnderlyingSourceCrs ) )
{
const QString authid = QStringLiteral( "%1:%2" ).arg( authName, authCode );
if ( createFromOgcWmsCrs( authid ) )
{
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableProj4Cache )
sProj4Cache.insert( projString, *this );
return true;
}
}
}
// try a direct match against user crses
QgsCoordinateReferenceSystem::RecordMap myRecord = getRecord( "select * from tbl_srs where parameters=" + QgsSqliteUtils::quotedString( myProj4String ) + " order by deprecated" );
long id = 0;
if ( !myRecord.empty() )
{
id = myRecord[QStringLiteral( "srs_id" )].toLong();
if ( id >= USER_CRS_START_ID )
{
createFromSrsId( id );
}
}
if ( id < USER_CRS_START_ID )
{
// no direct matches, so go ahead and create a new proj object based on the proj string alone.
setProjString( myProj4String );
// lastly, try a tolerant match of the created proj object against all user CRSes (allowing differences in parameter order during the comparison)
id = matchToUserCrs();
if ( id >= USER_CRS_START_ID )
{
createFromSrsId( id );
}
}
#else
QRegExp myProjRegExp( "\\+proj=(\\S+)" );
int myStart = myProjRegExp.indexIn( myProj4String );
if ( myStart == -1 )
{
locker.changeMode( QgsReadWriteLocker::Write );
if ( !sDisableProj4Cache )
sProj4Cache.insert( projString, *this );
return d->mIsValid;
}
d->mProjectionAcronym = myProjRegExp.cap( 1 );
QRegExp myEllipseRegExp( "\\+ellps=(\\S+)" );
myStart = myEllipseRegExp.indexIn( myProj4String );
if ( myStart == -1 )
{
d->mEllipsoidAcronym.clear();
}
else
{
d->mEllipsoidAcronym = myEllipseRegExp.cap( 1 );
}
QRegExp myAxisRegExp( "\\+a=(\\S+)" );