Method ReadData3DGroupsData

plugins/e57/libE57Format/src/ReaderImpl.cpp:1500–1560

Reads the group data

   // Reads the group data
   bool ReaderImpl::ReadData3DGroupsData( int64_t dataIndex, size_t groupCount,
                                          int64_t *idElementValue, int64_t *startPointIndex,
                                          int64_t *pointCount ) const
   {
      if ( ( dataIndex < 0 ) || ( dataIndex >= data3D_.childCount() ) )
      {
         return false;
      }

      const StructureNode scan( data3D_.get( dataIndex ) );

      if ( !scan.isDefined( "pointGroupingSchemes" ) )
      {
         return false;
      }

      const StructureNode pointGroupingSchemes( scan.get( "pointGroupingSchemes" ) );

      if ( !pointGroupingSchemes.isDefined( "groupingByLine" ) )
      {
         return false;
      }

      const StructureNode groupingByLine( pointGroupingSchemes.get( "groupingByLine" ) );
      const StringNode idElementName( groupingByLine.get( "idElementName" ) );
      CompressedVectorNode groups( groupingByLine.get( "groups" ) );
      const StructureNode lineGroupRecord( groups.prototype() );
      const int64_t protoCount = lineGroupRecord.childCount();
      std::vector<SourceDestBuffer> groupSDBuffers;

      for ( int64_t protoIndex = 0; protoIndex < protoCount; protoIndex++ )
      {
         const ustring name = lineGroupRecord.get( protoIndex ).elementName();

         if ( ( name == "idElementValue" ) && lineGroupRecord.isDefined( "idElementValue" ) &&
              ( idElementValue != nullptr ) )
         {
            groupSDBuffers.emplace_back( imf_, "idElementValue", idElementValue, groupCount, true );
         }

         if ( ( name == "startPointIndex" ) && lineGroupRecord.isDefined( "startPointIndex" ) &&
              ( startPointIndex != nullptr ) )
         {
            groupSDBuffers.emplace_back( imf_, "startPointIndex", startPointIndex, groupCount,
                                         true );
         }

         if ( ( name == "pointCount" ) && lineGroupRecord.isDefined( "pointCount" ) &&
              ( pointCount != nullptr ) )
         {
            groupSDBuffers.emplace_back( imf_, "pointCount", pointCount, groupCount, true );
         }
      }

      CompressedVectorReader reader = groups.reader( groupSDBuffers );

      reader.read();
      reader.close();