new vector cast filter

- contrary to ITK's equivalent, supports fields with different number components per pixel

diff --git a/itk/itkFlexibleVectorCastImageFilter.h b/itk/itkFlexibleVectorCastImageFilter.h
new file mode 100644 (file)
index 0000000..1e73a92
--- /dev/null
+++ b/itk/itkFlexibleVectorCastImageFilter.h
@@ -0,0 +1,113 @@
+/*=========================================================================
+
+  Program:   Insight Segmentation & Registration Toolkit
+  Module:    $RCSfile: itkFlexibleVectorCastImageFilter.h,v $
+  Language:  C++
+  Date:      $Date: 2008-10-17 16:30:53 $
+  Version:   $Revision: 1.16 $
+
+  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 __itkFlexibleVectorCastImageFilter_h
+#define __itkFlexibleVectorCastImageFilter_h
+
+#include "itkUnaryFunctorImageFilter.h"
+#include "itkNumericTraitsFixedArrayPixel.h"
+
+namespace itk
+{
+  
+/** \class FlexibleVectorCastImageFilter
+ *
+ * \brief Casts input vector pixels to output vector pixel type.
+ *
+ * This filter is templated over the input image type and 
+ * output image type.
+ * 
+ * The filter expect both images to have the same number of dimensions,
+ * and that both the input and output have itk::Vector pixel types
+ * of the same VectorDimension.
+ *
+ * \sa Vector
+ *
+ * \ingroup IntensityImageFilters  Multithreaded
+ */
+namespace Functor {  
+  
+template< class TInput, class TOutput>
+class FlexibleVectorCast
+{
+public:
+  FlexibleVectorCast() {}
+  ~FlexibleVectorCast() {}
+  bool operator!=( const FlexibleVectorCast & ) const
+    {
+    return false;
+    }
+  bool operator==( const FlexibleVectorCast & other ) const
+    {
+    return !(*this != other);
+    }
+  inline TOutput operator()( const TInput & A ) const
+    {
+    typedef typename TOutput::ValueType OutputValueType;
+
+    TOutput value;
+    unsigned int k;
+    for( k = 0; k < TOutput::Dimension && k < TInput::Dimension; k++ )
+      {
+      value[k] = static_cast<OutputValueType>( A[k] );
+      }
+      
+    for (; k < TOutput::Dimension; k++)
+      value[k] = 0;
+    
+    return value;
+    }
+}; 
+}
+
+template <class TInputImage, class TOutputImage = itk::Vector<float, 3> >
+class ITK_EXPORT FlexibleVectorCastImageFilter :
+    public
+UnaryFunctorImageFilter<TInputImage,TOutputImage, 
+                        Functor::FlexibleVectorCast< typename TInputImage::PixelType, 
+                                             typename TOutputImage::PixelType>   >
+{
+public:
+  /** Standard class typedefs. */
+  typedef FlexibleVectorCastImageFilter                               Self;
+  typedef UnaryFunctorImageFilter<
+    TInputImage,TOutputImage, 
+    Functor::FlexibleVectorCast< typename TInputImage::PixelType, 
+                         typename TOutputImage::PixelType> >  Superclass;
+  typedef SmartPointer<Self>                                  Pointer;
+  typedef SmartPointer<const Self>                            ConstPointer;
+
+  /** Method for creation through the object factory. */
+  itkNewMacro(Self);
+
+  /** Runtime information support. */
+  itkTypeMacro(FlexibleVectorCastImageFilter, 
+               UnaryFunctorImageFilter);
+
+protected:
+  FlexibleVectorCastImageFilter() {}
+  virtual ~FlexibleVectorCastImageFilter() {}
+
+private:
+  FlexibleVectorCastImageFilter(const Self&); //purposely not implemented
+  void operator=(const Self&); //purposely not implemented
+
+};
+
+} // end namespace itk
+
+
+#endif