vtkSpanSpace.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkSpanSpace.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkSpanSpace_h
#define vtkSpanSpace_h

#include "vtkCommonExecutionModelModule.h" // For export macro
#include "vtkScalarTree.h"

class vtkInternalSpanSpace;


class VTKCOMMONEXECUTIONMODEL_EXPORT vtkSpanSpace : public vtkScalarTree
{
public:
  static vtkSpanSpace *New();


  vtkTypeMacro(vtkSpanSpace,vtkScalarTree);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  //----------------------------------------------------------------------
  // The following methods are specific to the creation and configuration of
  // vtkSpanSpace.


  vtkSetClampMacro(Resolution,vtkIdType,1,VTK_INT_MAX);
  vtkGetMacro(Resolution,vtkIdType);

  //----------------------------------------------------------------------
  // The following methods satisfy the vtkScalarTree abstract API.

  void Initialize() override;

  void BuildTree() override;

  void InitTraversal(double scalarValue) override;

  vtkCell *GetNextCell(vtkIdType &cellId, vtkIdList* &ptIds,
                               vtkDataArray *cellScalars) override;

  // The following methods supports parallel (threaded)
  // applications. Basically batches of cells (which represent a
  // portion of the whole dataset) are available for processing in a
  // parallel For() operation. In the case of span space, a batch is
  // taken from a portion of the span rectangle.

  vtkIdType GetNumberOfCellBatches() override;

  const vtkIdType* GetCellBatch(vtkIdType batchNum,
                                        vtkIdType& numCells) override;

protected:
  vtkSpanSpace();
  ~vtkSpanSpace() override;

  vtkIdType Resolution;
  vtkInternalSpanSpace *SpanSpace;
  vtkIdType BatchSize;

private:
  // Internal variables supporting span space traversal
  vtkIdType RMin[2]; //span space lower left corner
  vtkIdType RMax[2]; //span space upper right corner

  // This supports serial traversal via GetNextCell()
  vtkIdType CurrentRow; //the span space row currently being processed
  vtkIdType *CurrentSpan; //pointer to current span row
  vtkIdType CurrentIdx; //position into the current span row
  vtkIdType CurrentNumCells; //number of cells on the current span row

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

#endif