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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkPyBuffer.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.
=========================================================================*/
#ifndef _itkPyBuffer_txx
#define _itkPyBuffer_txx
#include "itkPyBuffer.h"
namespace itk
{
template<typename TImage>
PyBuffer<TImage>
::PyBuffer()
{
this->obj = NULL;
this->m_Importer = ImporterType::New();
import_libnumarray();
}
template<typename TImage>
PyBuffer<TImage>
::~PyBuffer()
{
if (this->obj)
{
Py_DECREF(this->obj);
}
this->obj = NULL;
}
template<typename TImage>
PyObject *
PyBuffer<TImage>
::GetArrayFromImage( const ImageType * image )
{
if( !image )
{
itkExceptionMacro("Input image is null");
}
PixelType * buffer = const_cast< PixelType *>( image->GetBufferPointer() );
char * data = (char *)( buffer );
int dimensions[ ImageDimension ];
SizeType size = image->GetBufferedRegion().GetSize();
for(unsigned int d=0; d < ImageDimension; d++ )
{
dimensions[d] = size[d];
}
int item_type = 0; // TODO find a way of doing this through pixel traits
this->obj = PyArray_FromDimsAndData( ImageDimension, dimensions, item_type, data );
return this->obj;
}
template<typename TImage>
const typename PyBuffer<TImage>::ImageType *
PyBuffer<TImage>
::GetImageFromArray( PyObject *obj )
{
if (obj != this->obj)
{
if (this->obj)
{
// get rid of our reference
Py_DECREF(this->obj);
}
// store the new object
this->obj = obj;
if (this->obj)
{
// take out reference (so that the calling code doesn't
// have to keep a binding to the callable around)
Py_INCREF(this->obj);
}
}
int element_type = PyArray_DOUBLE; // change this with pixel traits.
PyArrayObject * parray =
(PyArrayObject *) PyArray_ContiguousFromObject(
this->obj,
element_type,
ImageDimension,
ImageDimension );
if( parray == NULL )
{
itkExceptionMacro("Contiguous array couldn't be created from input python object");
}
const unsigned int imageDimension = parray->nd;
SizeType size;
unsigned int numberOfPixels = 1;
for( unsigned int d=0; d<imageDimension; d++ )
{
size[d] = parray->dimensions[d];
numberOfPixels *= parray->dimensions[d];
}
IndexType start;
start.Fill( 0 );
RegionType region;
region.SetIndex( start );
region.SetSize( size );
PointType origin;
origin.Fill( 0.0 );
SpacingType spacing;
spacing.Fill( 1.0 );
this->m_Importer->SetRegion( region );
this->m_Importer->SetOrigin( origin );
this->m_Importer->SetSpacing( spacing );
const bool importImageFilterWillOwnTheBuffer = false;
PixelType * data = (PixelType *)parray->data;
this->m_Importer->SetImportPointer(
data,
numberOfPixels,
importImageFilterWillOwnTheBuffer );
this->m_Importer->Update();
return this->m_Importer->GetOutput();
}
} // namespace itk
#endif
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