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contrib/vtkImageToPolyDataFilter.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImageToPolyDataFilter.h,v $
  Language:  C++


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#ifndef __vtkImageToPolyDataFilter_h
#define __vtkImageToPolyDataFilter_h

#include "vtkStructuredPointsToPolyDataFilter.h"
#include "vtkScalarsToColors.h"

#define VTK_STYLE_PIXELIZE 0
#define VTK_STYLE_POLYGONALIZE 1
#define VTK_STYLE_RUN_LENGTH 2

#define VTK_COLOR_MODE_LUT 0
#define VTK_COLOR_MODE_LINEAR_256 1

class vtkStructuredPoints;
class vtkEdgeTable;
class vtkScalars;
class vtkAppendPolyData;

class VTK_EXPORT vtkImageToPolyDataFilter : public vtkStructuredPointsToPolyDataFilter
{
public:
  vtkTypeMacro(vtkImageToPolyDataFilter,vtkStructuredPointsToPolyDataFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkImageToPolyDataFilter *New() 
    {return new vtkImageToPolyDataFilter;};

  vtkSetClampMacro(OutputStyle,int,VTK_STYLE_PIXELIZE,VTK_STYLE_RUN_LENGTH);
  vtkGetMacro(OutputStyle,int);
  void SetOutputStyleToPixelize() 
    {this->SetOutputStyle(VTK_STYLE_PIXELIZE);};
  void SetOutputStyleToPolygonalize() 
    {this->SetOutputStyle(VTK_STYLE_POLYGONALIZE);};
  void SetOutputStyleToRunLength() 
    {this->SetOutputStyle(VTK_STYLE_RUN_LENGTH);};

  vtkSetClampMacro(ColorMode,int,VTK_COLOR_MODE_LUT,VTK_COLOR_MODE_LINEAR_256);
  vtkGetMacro(ColorMode,int);
  void SetColorModeToLUT() 
    {this->SetColorMode(VTK_COLOR_MODE_LUT);};
  void SetColorModeToLinear256() 
    {this->SetColorMode(VTK_COLOR_MODE_LINEAR_256);};

  vtkSetObjectMacro(LookupTable,vtkScalarsToColors);
  vtkGetObjectMacro(LookupTable,vtkScalarsToColors);

  vtkSetMacro(Smoothing, int);
  vtkGetMacro(Smoothing, int);
  vtkBooleanMacro(Smoothing, int);
  
  vtkSetClampMacro(NumberOfSmoothingIterations,int,0,VTK_LARGE_INTEGER);
  vtkGetMacro(NumberOfSmoothingIterations,int);
  
  vtkSetMacro(Decimation, int);
  vtkGetMacro(Decimation, int);
  vtkBooleanMacro(Decimation, int);
  
  vtkSetClampMacro(DecimationError,float,0.0,VTK_LARGE_FLOAT);
  vtkGetMacro(DecimationError,float);
  
  vtkSetClampMacro(Error,int,0,VTK_LARGE_INTEGER);
  vtkGetMacro(Error,int);

  vtkSetClampMacro(SubImageSize,int,10,VTK_LARGE_INTEGER);
  vtkGetMacro(SubImageSize,int);
  
protected:
  vtkImageToPolyDataFilter();
  ~vtkImageToPolyDataFilter();
  vtkImageToPolyDataFilter(const vtkImageToPolyDataFilter&) {};
  void operator=(const vtkImageToPolyDataFilter&) {};

  void Execute();

  int OutputStyle;
  int ColorMode;
  int Smoothing;
  int NumberOfSmoothingIterations;
  int Decimation;
  float DecimationError;
  int Error;
  int SubImageSize;
  vtkScalarsToColors *LookupTable;

  virtual void PixelizeImage(vtkUnsignedCharArray *pixels, int dims[3], 
                             float origin[3], float spacing[3], 
                             vtkPolyData *output);
  virtual void PolygonalizeImage(vtkUnsignedCharArray *pixels, int dims[3], 
                                 float origin[3], float spacing[3], 
                                 vtkPolyData *output);
  virtual void RunLengthImage(vtkUnsignedCharArray *pixels, int dims[3], 
                              float origin[3], float spacing[3], 
                              vtkPolyData *output);
private:
  vtkUnsignedCharArray *Table;      // color table used to quantize points
  vtkTimeStamp         TableMTime;
  int                  *Visited;    // traverse & mark connected regions
  vtkUnsignedCharArray *PolyColors; // the colors of each region -> polygon
  vtkEdgeTable         *EdgeTable;  // keep track of intersection points
  vtkEdgeTable         *EdgeUseTable; // keep track of polygons use of edges
  vtkIntArray          *EdgeUses; //the two polygons that use an edge
                                  //and point id associated with edge (if any)

  vtkAppendPolyData    *Append;

  void BuildTable(unsigned char *inPixels);
  vtkUnsignedCharArray *QuantizeImage(vtkScalars *inScalars, int numComp,
                                          int type, int dims[3], int ext[4]);
  int ProcessImage(vtkUnsignedCharArray *pixels, int dims[2]);
  int BuildEdges(vtkUnsignedCharArray *pixels, int dims[3], float origin[3],
                 float spacing[3], vtkUnsignedCharArray *pointDescr, 
                 vtkPolyData *edges);
  void BuildPolygons(vtkUnsignedCharArray *pointDescr, vtkPolyData *edges,
                     int numPolys, vtkUnsignedCharArray *polyColors);
  void SmoothEdges(vtkUnsignedCharArray *pointDescr, vtkPolyData *edges);
  void DecimateEdges(vtkPolyData *edges, vtkUnsignedCharArray *pointDescr,
                     float tol2);
  void GeneratePolygons(vtkPolyData *edges, int numPolys, vtkPolyData *output,
                        vtkUnsignedCharArray *polyColors,
                        vtkUnsignedCharArray *pointDescr);
  
  int GetNeighbors(unsigned char *ptr, int &i, int &j, int dims[3],
                   unsigned char *neighbors[4], int mode);

  void GetIJ(int id, int &i, int &j, int dims[3]);
  unsigned char *GetColor(unsigned char *rgb);
  int IsSameColor(unsigned char *p1, unsigned char *p2);
  
};

#endif

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