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

  Program:   Visualization Toolkit
  Module:    vtkImageImport.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 1993-2002 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 vtkImageImport - Import data from a C array.
// .SECTION Description
// vtkImageImport provides methods needed to import image data from a source
// independent of VTK, such as a simple C array or a third-party pipeline.
// Note that the VTK convention is for the image voxel index (0,0,0) to be
// the lower-left corner of the image, while most 2D image formats use
// the upper-left corner.  You can use vtkImageFlip to correct the 
// orientation after the image has been loaded into VTK.
// Note that is also possible to import the raw data from a Python string
// instead of from a C array.
// .SECTION See Also
// vtkImageExport

#ifndef __vtkImageImport_h
#define __vtkImageImport_h

#include "vtkImageSource.h"
#include "vtkTransform.h"

class VTK_IMAGING_EXPORT vtkImageImport : public vtkImageSource
{
public:
  static vtkImageImport *New();
  vtkTypeRevisionMacro(vtkImageImport,vtkImageSource);
  void PrintSelf(ostream& os, vtkIndent indent);   

  // Description:
  // Import data and make an internal copy of it.  If you do not want
  // VTK to copy the data, then use SetImportVoidPointer instead (do
  // not use both).  Give the size of the data array in bytes.
  void CopyImportVoidPointer(void *ptr, int size);
  
  // Description:
  // Set the pointer from which the image data is imported.  VTK will
  // not make its own copy of the data, it will access the data directly
  // from the supplied array.  VTK will not attempt to delete the data
  // nor modify the data.
  void SetImportVoidPointer(void *ptr);
  void *GetImportVoidPointer() {return this->ImportVoidPointer;};

  // Description:
  // Set the pointer from which the image data is imported.  Set save to 1 
  // (the default) unless you want VTK to delete the array via C++ delete
  // when the vtkImageImport object is deallocated.  VTK will not make its
  // own copy of the data, it will access the data directly from the
  // supplied array.
  void SetImportVoidPointer(void *ptr, int save);
  
  // Description:
  // Set/Get the data type of pixels in the imported data.  This is used
  // as the scalar type of the Output.  Default: Short.
  vtkSetMacro(DataScalarType,int);
  void SetDataScalarTypeToDouble(){this->SetDataScalarType(VTK_DOUBLE);}
  void SetDataScalarTypeToFloat(){this->SetDataScalarType(VTK_FLOAT);}
  void SetDataScalarTypeToInt(){this->SetDataScalarType(VTK_INT);}
  void SetDataScalarTypeToShort(){this->SetDataScalarType(VTK_SHORT);}
  void SetDataScalarTypeToUnsignedShort()
    {this->SetDataScalarType(VTK_UNSIGNED_SHORT);}
  void SetDataScalarTypeToUnsignedChar()
    {this->SetDataScalarType(VTK_UNSIGNED_CHAR);}
  vtkGetMacro(DataScalarType, int);
  const char *GetDataScalarTypeAsString() { 
    return vtkImageScalarTypeNameMacro(this->DataScalarType); }

  // Description:
  // Set/Get the number of scalar components, for RGB images this must be 3.
  // Default: 1.
  vtkSetMacro(NumberOfScalarComponents,int);
  vtkGetMacro(NumberOfScalarComponents,int);
  
  // Description:
  // Get/Set the extent of the data buffer.  The dimensions of your data
  // must be equal to (extent[1]-extent[0]+1) * (extent[3]-extent[2]+1) * 
  // (extent[5]-DataExtent[4]+1).  For example, for a 2D image use
  // (0,width-1, 0,height-1, 0,0).
  vtkSetVector6Macro(DataExtent,int);
  vtkGetVector6Macro(DataExtent,int);
  void SetDataExtentToWholeExtent()
    {this->SetDataExtent(this->GetWholeExtent());}
  
  // Description:
  // Set/Get the spacing (typically in mm) between image voxels.
  // Default: (1.0, 1.0, 1.0).
  vtkSetVector3Macro(DataSpacing,float);
  vtkGetVector3Macro(DataSpacing,float);
  
  // Description:
  // Set/Get the origin of the data, i.e. the coordinates (usually in mm)
  // of voxel (0,0,0).  Default: (0.0, 0.0, 0.0). 
  vtkSetVector3Macro(DataOrigin,float);
  vtkGetVector3Macro(DataOrigin,float);  

  // Description:
  // Get/Set the whole extent of the image.  This is the largest possible
  // extent.  Set the DataExtent to the extent of the image in the buffer
  // pointed to by the ImportVoidPointer.
  vtkSetVector6Macro(WholeExtent,int);
  vtkGetVector6Macro(WholeExtent,int);
  
  // Description:
  // Propagates the update extent through the callback if it is set.
  virtual void PropagateUpdateExtent(vtkDataObject *output);

  //BTX
  // Description:
  // These are function pointer types for the pipeline connection
  // callbacks.  See furhter documentation on each individual callback.
  typedef void (*UpdateInformationCallbackType)(void*);
  typedef int (*PipelineModifiedCallbackType)(void*);
  typedef int* (*WholeExtentCallbackType)(void*);
  typedef float* (*SpacingCallbackType)(void*);
  typedef float* (*OriginCallbackType)(void*);
  typedef const char* (*ScalarTypeCallbackType)(void*); 
  typedef int (*NumberOfComponentsCallbackType)(void*);
  typedef void (*PropagateUpdateExtentCallbackType)(void*, int*);
  typedef void (*UpdateDataCallbackType)(void*);
  typedef int* (*DataExtentCallbackType)(void*);
  typedef void* (*BufferPointerCallbackType)(void*);

  // Description:  
  // Set/Get the callback for propagating UpdateInformation calls to a
  // third-party pipeline.  The callback should make sure that the
  // third-party pipeline information is up to date.
  vtkSetMacro(UpdateInformationCallback, UpdateInformationCallbackType);
  vtkGetMacro(UpdateInformationCallback, UpdateInformationCallbackType);
  
  // Description:
  // Set/Get the callback for checking whether the third-party
  // pipeline has been modified since the last invocation of the
  // callback.  The callback should return 1 for modified, and 0 for
  // not modified.  The first call should always return modified.
  vtkSetMacro(PipelineModifiedCallback, PipelineModifiedCallbackType);
  vtkGetMacro(PipelineModifiedCallback, PipelineModifiedCallbackType);

  // Description:
  // Set/Get the callback for getting the whole extent of the input
  // image from a third-party pipeline.  The callback should return a
  // vector of six integers describing the extent of the whole image
  // (x1 x2 y1 y2 z1 z2).
  vtkSetMacro(WholeExtentCallback, WholeExtentCallbackType);
  vtkGetMacro(WholeExtentCallback, WholeExtentCallbackType);

  // Description:
  // Set/Get the callback for getting the spacing of the input image
  // from a third-party pipeline.  The callback should return a vector
  // of three float values describing the spacing (dx dy dz).
  vtkSetMacro(SpacingCallback, SpacingCallbackType);
  vtkGetMacro(SpacingCallback, SpacingCallbackType);

  // Description:
  // Set/Get the callback for getting the origin of the input image
  // from a third-party pipeline.  The callback should return a vector
  // of three float values describing the origin (x0 y0 z0).
  vtkSetMacro(OriginCallback, OriginCallbackType);
  vtkGetMacro(OriginCallback, OriginCallbackType);

  // Description:
  // Set/Get the callback for getting the scalar value type of the
  // input image from a third-party pipeline.  The callback should
  // return a string with the name of the type.
  vtkSetMacro(ScalarTypeCallback, ScalarTypeCallbackType);
  vtkGetMacro(ScalarTypeCallback, ScalarTypeCallbackType);
  
  // Description:  
  // Set/Get the callback for getting the number of components of the
  // input image from a third-party pipeline.  The callback should
  // return an integer with the number of components.
  vtkSetMacro(NumberOfComponentsCallback, NumberOfComponentsCallbackType);
  vtkGetMacro(NumberOfComponentsCallback, NumberOfComponentsCallbackType);
  
  // Description:  
  // Set/Get the callback for propagating the pipeline update extent
  // to a third-party pipeline.  The callback should take a vector of
  // six integers describing the extent.  This should cause the
  // third-party pipeline to provide data which contains at least this
  // extent after the next UpdateData callback.
  vtkSetMacro(PropagateUpdateExtentCallback,PropagateUpdateExtentCallbackType);
  vtkGetMacro(PropagateUpdateExtentCallback,PropagateUpdateExtentCallbackType);
  
  // Description:  
  // Set/Get the callback for propagating UpdateData calls to a
  // third-party pipeline.  The callback should make sure the
  // third-party pipeline is up to date.
  vtkSetMacro(UpdateDataCallback, UpdateDataCallbackType);
  vtkGetMacro(UpdateDataCallback, UpdateDataCallbackType);
  
  // Description:  
  // Set/Get the callback for getting the data extent of the input
  // image from a third-party pipeline.  The callback should return a
  // vector of six integers describing the extent of the buffered
  // portion of the image (x1 x2 y1 y2 z1 z2).  The buffer location
  // should be set with the BufferPointerCallback.
  vtkSetMacro(DataExtentCallback, DataExtentCallbackType);
  vtkGetMacro(DataExtentCallback, DataExtentCallbackType);
  
  // Description:  
  // Set/Get the callback for getting a pointer to the data buffer of
  // an image from a third-party pipeline.  The callback should return
  // a pointer to the beginning of the buffer.  The extent of the
  // buffer should be set with the DataExtentCallback.
  vtkSetMacro(BufferPointerCallback, BufferPointerCallbackType);
  vtkGetMacro(BufferPointerCallback, BufferPointerCallbackType);

  // Description:
  // Set/Get the user data which will be passed as the first argument
  // to all of the third-party pipeline callbacks.
  vtkSetMacro(CallbackUserData, void*);
  vtkGetMacro(CallbackUserData, void*);  
  
  //ETX

protected:
  vtkImageImport();
  ~vtkImageImport();

  virtual void UpdateInformation();
  virtual void ExecuteInformation();
  
  void InvokeUpdateInformationCallbacks();
  void InvokeExecuteInformationCallbacks();
  void InvokeExecuteDataCallbacks();
  void LegacyCheckWholeExtent();
  
  void *ImportVoidPointer;
  int SaveUserArray;
  
  int NumberOfScalarComponents;
  int DataScalarType;

  int WholeExtent[6];
  int DataExtent[6];
  float DataSpacing[3];
  float DataOrigin[3];

  void* CallbackUserData;
  
  //BTX
  UpdateInformationCallbackType     UpdateInformationCallback;
  PipelineModifiedCallbackType      PipelineModifiedCallback;
  WholeExtentCallbackType           WholeExtentCallback;
  SpacingCallbackType               SpacingCallback;
  OriginCallbackType                OriginCallback;
  ScalarTypeCallbackType            ScalarTypeCallback;
  NumberOfComponentsCallbackType    NumberOfComponentsCallback;  
  PropagateUpdateExtentCallbackType PropagateUpdateExtentCallback;  
  UpdateDataCallbackType            UpdateDataCallback;
  DataExtentCallbackType            DataExtentCallback;
  BufferPointerCallbackType         BufferPointerCallback;
  //ETX
  
  virtual void ExecuteData(vtkDataObject *d);

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

#endif
