/* ***** BEGIN LICENSE BLOCK *****
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* $Id: upconvert.h,v 1.13 2007/11/22 15:19:28 tjdwave Exp $ $Name: Dirac_0_9_1 $
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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* The Original Code is BBC Research and Development code.
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* Contributor(s): Richard Felton (Original Author), Thomas Davies
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#ifndef _UPCONVERT_H_
#define _UPCONVERT_H_

#include <libdirac_common/common.h>

namespace dirac
{
    //Optimised upconversion class - no array resizes.
    //Uses integer math - no floats!
    //

    //! Upconversion class
    /*!
        Class to upconvert data by a factor of 2 in both dimensions
     */
    class UpConverter
    {

    public:

        //! Constructor
        UpConverter(int min_val, int max_val, int orig_xlen, int orig_ylen);

        //! Destructor
        ~UpConverter() {};

        //! Upconvert the picture data
        /*!
            Upconvert the picture data, where the parameters are
            \param    pic_data   is the original data
            \param    up_data    is the upconverted data
         */
        void DoUpConverter(const PicArray& pic_data, PicArray& up_data);

    private:
        //! Private body-less copy constructor: class should not be copied
        UpConverter(const UpConverter& cpy);

        //! Private body-less assignment: class should not be assigned
        UpConverter& operator=(const UpConverter& rhs);

        //! Applies the filter to a row and its successor 
        void RowLoop(PicArray& up_data, const int row_num,
        const int filter_size, const int filter_shift, const short taps[4] );

    private:
        //Variable to keep the loops in check
        int m_width_old, m_height_old;
        int m_width_new, m_height_new;


        const int m_min_val;
        const int m_max_val;

        const int m_orig_xl;
        const int m_orig_yl;
    };

} // namespace dirac

#endif
