// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
 * @class   vtkVoxelContoursToSurfaceFilter
 * @brief   create surface from contours
 *
 * vtkVoxelContoursToSurfaceFilter is a filter that takes contours and
 * produces surfaces. There are some restrictions for the contours:
 *
 *   - The contours are input as vtkPolyData, with the contours being
 *     polys in the vtkPolyData.
 *   - The contours lie on XY planes - each contour has a constant Z
 *   - The contours are ordered in the polys of the vtkPolyData such
 *     that all contours on the first (lowest) XY plane are first, then
 *     continuing in order of increasing Z value.
 *   - The X, Y and Z coordinates are all integer values.
 *   - The desired sampling of the contour data is 1x1x1 - Aspect can
 *     be used to control the aspect ratio in the output polygonal
 *     dataset.
 *
 * This filter takes the contours and produces a structured points
 * dataset of signed floating point number indicating distance from
 * a contour. A contouring filter is then applied to generate 3D
 * surfaces from a stack of 2D contour distance slices. This is
 * done in a streaming fashion so as not to use to much memory.
 *
 * @sa
 * vtkPolyDataAlgorithm
 */

#ifndef vtkVoxelContoursToSurfaceFilter_h
#define vtkVoxelContoursToSurfaceFilter_h

#include "vtkFiltersGeneralModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"

VTK_ABI_NAMESPACE_BEGIN
class VTKFILTERSGENERAL_EXPORT vtkVoxelContoursToSurfaceFilter : public vtkPolyDataAlgorithm
{
public:
  static vtkVoxelContoursToSurfaceFilter* New();
  vtkTypeMacro(vtkVoxelContoursToSurfaceFilter, vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  ///@{
  /**
   * Set / Get the memory limit in bytes for this filter. This is the limit
   * of the size of the structured points data set that is created for
   * intermediate processing. The data will be streamed through this volume
   * in as many pieces as necessary.
   */
  vtkSetMacro(MemoryLimitInBytes, int);
  vtkGetMacro(MemoryLimitInBytes, int);
  ///@}

  vtkSetVector3Macro(Spacing, double);
  vtkGetVectorMacro(Spacing, double, 3);

protected:
  vtkVoxelContoursToSurfaceFilter();
  ~vtkVoxelContoursToSurfaceFilter() override;

  int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;

  int MemoryLimitInBytes;

  double Spacing[3];

  double* LineList;
  int LineListLength;
  int LineListSize;

  double* SortedXList;
  double* SortedYList;
  int SortedListSize;

  int* WorkingList;
  int WorkingListLength;

  double* IntersectionList;
  int IntersectionListLength;

  void AddLineToLineList(double x1, double y1, double x2, double y2);
  void SortLineList();

  void CastLines(float* slice, double gridOrigin[3], int gridSize[3], int type);

  void PushDistances(float* ptr, int gridSize[3], int chunkSize);

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

VTK_ABI_NAMESPACE_END
#endif
