vtkCellGridToUnstructuredGrid.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkCellGridToUnstructuredGrid_h
#define vtkCellGridToUnstructuredGrid_h

#include "vtkCellGrid.h"              // For subclass
#include "vtkCellType.h"              // For initializer
#include "vtkFiltersCellGridModule.h" // For export macro
#include "vtkNew.h"                   // For ivar
#include "vtkStringToken.h"           // For ivars
#include "vtkUnstructuredGridAlgorithm.h"

#include <unordered_map>

VTK_ABI_NAMESPACE_BEGIN

class vtkIncrementalOctreePointLocator;

class VTKFILTERSCELLGRID_EXPORT vtkCellGridToUnstructuredGrid : public vtkUnstructuredGridAlgorithm
{
public:
  class Query : public vtkCellGridQuery
  {
  public:
    static Query* New();
    vtkTypeMacro(vtkCellGridToUnstructuredGrid::Query, vtkCellGridQuery);
    void PrintSelf(ostream& os, vtkIndent indent) override;

    struct OutputAllocation
    {
      int CellType{ VTK_EMPTY_CELL };
      vtkIdType NumberOfCells{ 0 };
      vtkIdType NumberOfConnectivityEntries{ 0 };
      vtkIdType CellOffset{ 0 };
      vtkIdType ConnOffset{ 0 };
    };

    using OutputAllocations = std::unordered_map<vtkStringToken, OutputAllocation>;

    enum PassType : int
    {
      CountOutputs = 0, 
      GenerateConnectivity =
        1, 
      GeneratePointData = 2 
    };

    bool Initialize() override;
    void StartPass() override;
    bool Finalize() override;

    bool IsAnotherPassRequired() override { return this->Pass < PassType::GeneratePointData; }

    vtkUnstructuredGrid* GetOutput() const { return this->Output; }
    vtkCellGrid* GetInput() const { return this->Input; }

    OutputAllocations& GetOutputAllocations() { return this->OutputOffsets; }
    const OutputAllocations& GetOutputAllocations() const { return this->OutputOffsets; }

    vtkDataArray* GetOutputArray(vtkCellAttribute* inputAttribute);

    vtkIncrementalOctreePointLocator* GetLocator() { return this->Locator.GetPointer(); }

    using ConnectivityTransformType = std::unordered_map<vtkIdType, vtkIdType>;
    ConnectivityTransformType& GetConnectivityTransform(vtkStringToken cellType)
    {
      return this->ConnectivityTransforms[cellType];
    }

    using ConnectivityCountType = std::map<vtkIdType, int>;
    ConnectivityCountType& GetConnectivityCount() { return this->ConnectivityCount; }

    using ConnectivityWeightType = std::vector<float>;
    ConnectivityWeightType& GetConnectivityWeights() { return this->ConnectivityWeights; }

  protected:
    friend class vtkCellGridToUnstructuredGrid;
    Query() = default;
    ~Query() override = default;

    vtkCellGrid* Input{ nullptr };
    vtkUnstructuredGrid* Output{ nullptr };

    OutputAllocations OutputOffsets;
    // Map input to output attributes:
    std::unordered_map<vtkCellAttribute*, vtkDataArray*> AttributeMap;
    vtkNew<vtkIncrementalOctreePointLocator> Locator;
    std::unordered_map<vtkStringToken, ConnectivityTransformType> ConnectivityTransforms;
    ConnectivityCountType ConnectivityCount;
    ConnectivityWeightType ConnectivityWeights;

  private:
    Query(const Query&) = delete;
    void operator=(const Query&) = delete;
  };

  static vtkCellGridToUnstructuredGrid* New();
  vtkTypeMacro(vtkCellGridToUnstructuredGrid, vtkUnstructuredGridAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

protected:
  vtkCellGridToUnstructuredGrid() = default;
  ~vtkCellGridToUnstructuredGrid() override = default;

  int FillInputPortInformation(int port, vtkInformation* info) override;
  int RequestData(
    vtkInformation* request, vtkInformationVector** inInfo, vtkInformationVector* ouInfo) override;

  vtkNew<Query> Request;

private:
  vtkCellGridToUnstructuredGrid(const vtkCellGridToUnstructuredGrid&) = delete;
  void operator=(const vtkCellGridToUnstructuredGrid&) = delete;
};

VTK_ABI_NAMESPACE_END
#endif // vtkCellGridToUnstructuredGrid_h