bool QgsOgrFeatureIterator::prepareSimplification( const QgsSimplifyMethod& simplifyMethod )
{
delete mGeometrySimplifier;
mGeometrySimplifier = NULL;
// setup simplification of OGR-geometries fetched
if ( !( mRequest.flags() & QgsFeatureRequest::NoGeometry ) && simplifyMethod.methodType() != QgsSimplifyMethod::NoSimplification && !simplifyMethod.forceLocalOptimization() )
{
QgsSimplifyMethod::MethodType methodType = simplifyMethod.methodType();
Q_UNUSED( methodType );
#if defined(GDAL_VERSION_NUM) && defined(GDAL_COMPUTE_VERSION)
#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(1,11,0)
if ( methodType == QgsSimplifyMethod::OptimizeForRendering )
{
int simplifyFlags = QgsMapToPixelSimplifier::SimplifyGeometry | QgsMapToPixelSimplifier::SimplifyEnvelope;
mGeometrySimplifier = new QgsOgrMapToPixelSimplifier( simplifyFlags, simplifyMethod.tolerance() );
return true;
}
#endif
#endif
#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1900
if ( methodType == QgsSimplifyMethod::PreserveTopology )
{
mGeometrySimplifier = new QgsOgrTopologyPreservingSimplifier( simplifyMethod.tolerance() );
return true;
}
#endif
QgsDebugMsg( QString( "Simplification method type (%1) is not recognised by OgrFeatureIterator class" ).arg( methodType ) );
}
return QgsAbstractFeatureIterator::prepareSimplification( simplifyMethod );
}
