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

  Program:   Visualization Toolkit
  Module:    vtkRendererSource.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.

=========================================================================*/
// .NAME vtkRendererSource - take a renderer into the pipeline
// .SECTION Description
// vtkRendererSource is a source object that gets its input from a 
// renderer and converts it to structured points. This can then be 
// used in a visualization pipeline. You must explicitly send a 
// Modify() to this object to get it to reload its data from the
// renderer. Consider using vtkWindowToImageFilter instead of this
// class.
//
// The data placed into the output is the renderer's image rgb values.
// Optionally, you can also grab the image depth (e.g., z-buffer) values, and
// place then into the output (point) field data.

// .SECTION see also
// vtkWindowToImageFilter vtkRenderer vtkStructuredPoints

#ifndef __vtkRendererSource_h
#define __vtkRendererSource_h

#include "vtkAlgorithm.h"
#include "vtkImageData.h" // makes things a bit easier

class vtkRenderer;

class VTK_RENDERING_EXPORT vtkRendererSource : public vtkAlgorithm
{
public:
  static vtkRendererSource *New();
  vtkTypeMacro(vtkRendererSource,vtkAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Return the MTime also considering the Renderer.
  unsigned long GetMTime();

  // Description:
  // Indicates what renderer to get the pixel data from.
  void SetInput(vtkRenderer*);

  // Description:
  // Returns which renderer is being used as the source for the pixel data.
  vtkGetObjectMacro(Input,vtkRenderer);

  // Description:
  // Use the entire RenderWindow as a data source or just the Renderer.
  // The default is zero, just the Renderer.
  vtkSetMacro(WholeWindow,int);
  vtkGetMacro(WholeWindow,int);
  vtkBooleanMacro(WholeWindow,int);
  
  // Description:
  // If this flag is on, the Executing causes a render first.
  vtkSetMacro(RenderFlag, int);
  vtkGetMacro(RenderFlag, int);
  vtkBooleanMacro(RenderFlag, int);

  // Description:
  // A boolean value to control whether to grab z-buffer 
  // (i.e., depth values) along with the image data. The z-buffer data
  // is placed into a field data attributes named "ZBuffer" .
  vtkSetMacro(DepthValues,int);
  vtkGetMacro(DepthValues,int);
  vtkBooleanMacro(DepthValues,int);

  // Description:
  // A boolean value to control whether to grab z-buffer 
  // (i.e., depth values) along with the image data. The z-buffer data
  // is placed in the scalars as a fourth Z component (shift and scaled
  // to map the full 0..255 range).
  vtkSetMacro(DepthValuesInScalars,int);
  vtkGetMacro(DepthValuesInScalars,int);
  vtkBooleanMacro(DepthValuesInScalars,int);
  
  // Description:
  // Get the output data object for a port on this algorithm.
  vtkImageData* GetOutput();

  // Description:
  // see vtkAlgorithm for details
  virtual int ProcessRequest(vtkInformation*,
                             vtkInformationVector**,
                             vtkInformationVector*);

protected:
  vtkRendererSource();
  ~vtkRendererSource();

  void RequestData(vtkInformation* request,
                   vtkInformationVector** inputVector,
                   vtkInformationVector* outputVector);
  virtual void RequestInformation (vtkInformation*,
                                  vtkInformationVector**,
                                  vtkInformationVector*);

  vtkRenderer *Input;
  int WholeWindow;
  int RenderFlag;
  int DepthValues;
  int DepthValuesInScalars;

  // see algorithm for more info
  virtual int FillOutputPortInformation(int port, vtkInformation* info);

private:
  vtkRendererSource(const vtkRendererSource&);  // Not implemented.
  void operator=(const vtkRendererSource&);  // Not implemented.
};

#endif