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#ifndef VIGRA_MULTI_RESIZE_HXX
#define VIGRA_MULTI_RESIZE_HXX

#include <vector>
#include "resizeimage.hxx"
#include "navigator.hxx"

namespace vigra {

namespace detail {

template <class SrcIterator, class Shape, class SrcAccessor,
          class DestIterator, class DestAccessor, class Kernel>
void
internalResizeMultiArrayOneDimension(
                      SrcIterator si, Shape const & sshape, SrcAccessor src,
                      DestIterator di, Shape const & dshape, DestAccessor dest, 
                      Kernel const & spline, unsigned int d)
{
    enum { N = 1 + SrcIterator::level };

    typedef typename NumericTraits<typename DestAccessor::value_type>::RealPromote TmpType;

    typedef MultiArrayNavigator<SrcIterator, N> SNavigator;
    typedef MultiArrayNavigator<DestIterator, N> DNavigator;

    SNavigator snav( si, sshape, d );
    DNavigator dnav( di, dshape, d );
    
    int ssize = sshape[d];
    int dsize = dshape[d];

    vigra_precondition(ssize > 1,
                 "resizeMultiArraySplineInterpolation(): "
                 "Source array too small.\n");

    Rational<int> ratio(dsize - 1, ssize - 1);
    Rational<int> offset(0);
    resampling_detail::MapTargetToSourceCoordinate mapCoordinate(ratio, offset);
    int period = lcm(ratio.numerator(), ratio.denominator());
    
    ArrayVector<double> const & prefilterCoeffs = spline.prefilterCoefficients();
    ArrayVector<Kernel1D<double> > kernels(period);
    createResamplingKernels(spline, mapCoordinate, kernels);

    // temporay array to hold the current line to enable in-place operation
    ArrayVector<TmpType> tmp( ssize );
    typename ArrayVector<TmpType>::iterator t = tmp.begin(), tend = tmp.end();
    typename AccessorTraits<TmpType>::default_accessor ta;
    
    for( ; snav.hasMore(); snav++, dnav++ )
    {
        // first copy source to temp for maximum cache efficiency
        copyLine( snav.begin(), snav.end(), src, t, ta);

        for(unsigned int b = 0; b < prefilterCoeffs.size(); ++b)
        {
            recursiveFilterLine(t, tend, ta, t, ta,
                                prefilterCoeffs[b], BORDER_TREATMENT_REFLECT);
        }
        resamplingConvolveLine(t, tend, ta,
                               dnav.begin(), dnav.begin() + dsize, dest,
                               kernels, mapCoordinate);
    }
}

} // namespace detail

/** \addtogroup GeometricTransformations Geometric Transformations
*/
//@{


/***************************************************************/
/*                                                             */
/*             resizeMultiArraySplineInterpolation             */
/*                                                             */
/***************************************************************/

/** \brief Resize MultiArray using B-spline interpolation.

    <b> Declarations:</b>

    pass arguments explicitly:
    \code
    namespace vigra {
        template <class SrcIterator, class Shape, class SrcAccessor,
                  class DestIterator, class DestAccessor,
                  class Kernel = BSpline<3, double> >
        void
        resizeMultiArraySplineInterpolation(
                              SrcIterator si, Shape const & sshape, SrcAccessor src,
                              DestIterator di, Shape const & dshape, DestAccessor dest,
                              Kernel const & spline = BSpline<3, double>());
    }
    \endcode


    use argument objects in conjunction with \ref ArgumentObjectFactories :
    \code
    namespace vigra {
        template <class SrcIterator, class Shape, class SrcAccessor,
                  class DestIterator, class DestAccessor,
                  class Kernel = BSpline<3, double> >
        void
        resizeMultiArraySplineInterpolation(
                              triple<SrcIterator, Shape, SrcAccessor> src,
                              triple<DestIterator, Shape, DestAccessor> dest,
                              Kernel const & spline = BSpline<3, double>());
    }
    \endcode

    The function implements separable spline interpolation algorithm described in

    M. Unser, A. Aldroubi, M. Eden, <i>"B-Spline Signal Processing"</i>
    IEEE Transactions on Signal Processing, vol. 41, no. 2, pp. 821-833 (part I),
    pp. 834-848 (part II), 1993.

    to obtain optimal interpolation quality and speed. You may pass the funcion
    a spline of arbitrary order (e.g. <TT>BSpline<ORDER, double></tt> or
    <TT>CatmullRomSpline<double></tt>). The default is a third order spline
    which gives a twice continuously differentiable interpolant.
    The implementation ensures that image values are interpolated rather
    than smoothed by first calling a recursive (sharpening) prefilter as
    described in the above paper. Then the actual interpolation is done
    using \ref resamplingConvolveLine().

    The range of both the input and output images (resp. regions)
    must be given. The input image must have a size of at
    least 4x4, the destination of at least 2x2. The scaling factors are then calculated
    accordingly. If the source image is larger than the destination, it
    is smoothed (band limited) using a recursive
    exponential filter. The source value_type (SrcAccessor::value_type) must
    be a linear algebra, i.e. it must support addition, subtraction,
    and multiplication (+, -, *), multiplication with a scalar
    real number and \ref NumericTraits "NumericTraits".
    The function uses accessors.

    <b> Usage:</b>

        <b>\#include</b> \<<a href="multi__resize_8hxx-source.html">vigra/multi_resize.hxx</a>\><br>
        Namespace: vigra

    \code
    typedef vigra::MultiArray<3, float>::difference_type Shape;
    vigra::MultiArray<3, float> src(Shape(5, 7, 10)),
                                dest(Shape(9, 13, 19)); // double the size

    // use default cubic spline interpolator
    vigra::resizeMultiArraySplineInterpolation(
               srcMultiArrayRange(src),
               destMultiArrayRange(dest));

    \endcode

    <b> Required Interface:</b>

    The source and destination iterators must be compatible with \ref vigra::MultiIterator. The array value
    types must be models of \ref LinearSpace.
*/
doxygen_overloaded_function(template <...> void resizeMultiArraySplineInterpolation)

template <class SrcIterator, class Shape, class SrcAccessor,
          class DestIterator, class DestAccessor, 
          class Kernel>
void
resizeMultiArraySplineInterpolation(
                      SrcIterator si, Shape const & sshape, SrcAccessor src,
                      DestIterator di, Shape const & dshape, DestAccessor dest, 
                      Kernel const & spline)
{
    enum { N = 1 + SrcIterator::level };
    typedef typename NumericTraits<typename DestAccessor::value_type>::RealPromote TmpType;
    typedef MultiArray<N, TmpType> TmpArray;
    typedef typename AccessorTraits<TmpType>::default_accessor TmpAccessor;
        
    if(N==1)
    {
        detail::internalResizeMultiArrayOneDimension(si, sshape, src, 
                      di, dshape, dest, spline, 0);
    }
    else
    {
        unsigned int d = 0;
        Shape tmpShape(sshape);
        tmpShape[d] = dshape[d];
        MultiArray<N, TmpType> tmp(tmpShape);
        TmpAccessor ta;
        
        detail::internalResizeMultiArrayOneDimension(si, sshape, src, 
                             tmp.traverser_begin(), tmpShape, ta, spline, d);
        d = 1;
        for(; d<N-1; ++d)
        {
            tmpShape[d] = dshape[d];
            MultiArray<N, TmpType> dtmp(tmpShape);
            
            detail::internalResizeMultiArrayOneDimension(tmp.traverser_begin(), tmp.shape(), ta, 
                                  dtmp.traverser_begin(), tmpShape, ta, spline, d);
            dtmp.swap(tmp);
        }
        detail::internalResizeMultiArrayOneDimension(tmp.traverser_begin(), tmp.shape(), ta, 
                                        di, dshape, dest, spline, d);
    }
}

template <class SrcIterator, class Shape, class SrcAccessor,
          class DestIterator, class DestAccessor, 
          class Kernel>
inline void
resizeMultiArraySplineInterpolation(triple<SrcIterator, Shape, SrcAccessor> src,
                      triple<DestIterator, Shape, DestAccessor> dest,
                      Kernel const & spline)
{
    resizeMultiArraySplineInterpolation(src.first, src.second, src.third,
                                   dest.first, dest.second, dest.third, spline);
}

template <class SrcIterator, class Shape, class SrcAccessor,
          class DestIterator, class DestAccessor>
inline void
resizeMultiArraySplineInterpolation(
                      SrcIterator si, Shape const & sshape, SrcAccessor src,
                      DestIterator di, Shape const & dshape, DestAccessor dest)
{
    resizeMultiArraySplineInterpolation(si, sshape, src, di, dshape, dest, BSpline<3, double>());
}

template <class SrcIterator, class Shape, class SrcAccessor,
          class DestIterator, class DestAccessor>
inline void
resizeMultiArraySplineInterpolation(triple<SrcIterator, Shape, SrcAccessor> src,
                      triple<DestIterator, Shape, DestAccessor> dest)
{
    resizeMultiArraySplineInterpolation(src.first, src.second, src.third,
                                   dest.first, dest.second, dest.third);
}

//@}

} // namespace vigra

#endif // VIGRA_MULTI_RESIZE_HXX
