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1 phase, coordinate enumerated neighbourhood operation

Pseudo code of the operation:

NeighbourhoodOp(Dst, Src, Ngb)
{
    foreach d, s in Dst, Src {
        Ngb.init(s.x, s.y, Src(s));
        foreach n in Ngb.begin() .. Ngb.end()
            Ngb.next(n.x, n.y, Src(s + n));
        Dst(d) = ngb.result();
    }
}

The requirements on the NgbT template parameter expressed as class definition are:

template<class DstValT, class SrcValT>
class NgbT
{
public:

    typedef HxTagCnum       IteratorCategory;
    typedef HxTag1Phase     PhaseCategory;

    typedef HxCnum              CnumType;

                                NgbT(HxTagList& tags);
                                ~NgbT();

    HxSizes                     size();

    CnumType                    begin();
    CnumType                    end();

    void                        init(int ix, int iy, SrcValT value);
    void                        next(int nx, int ny, SrcValT value);
    DstValT                     result() const;

    static HxString             className();
};

The Requirements on CnumType expressed as a class definition are:

class CnumType
{
public:
                                CnumType();
                                CnumType(const CnumType& rhs);
    CnumType&                   operator=(const CnumType& rhs);
    int                         x();
    int                         y();
    int                         z();
    void                        inc();
    bool                        operator!=(const CnumType& rhs);
};

Example(s):

• instantiation : HxInstNgbNonMaxSuppression2d_c, usage : HxNonMaxSuppressionGradDir
• instantiation : HxInstNgbIsMaxGradDir2d_c, usage : HxCannyThresholdAlt

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