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N phase, loop neighbourhood operation with an extra image

Pseudo code of the operation:

NeighbourhoodOp(Dst, Src, Ext, Ngb)
{
    foreach d, s, e in Dst, Src, Ext {
        phase = 1;
        do {
            Ngb.init(phase, s.x, s.y, Src(s), Ext(e));
            foreach n in Ngb.size()
                Ngb.next(n.x, n.y, Src(s - (Ngb.size()/2) + n),
                                   Ext(e - (Ngb.size()/2) + n));
            Ngb.done(phase);
        } while (Ngb.hasNextPhase(phase++));
        Dst(d) = ngb.result();
    }
}

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

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

    typedef HxTagLoop       IteratorCategory;
    typedef HxTagNPhase     PhaseCategory;

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

    HxSizes                     size();

    void                        init(int phase, int ix, int iy, SrcValT v1,
                                     ExtValT v2);
    void                        next(int nx, int ny, SrcValT v1, ExtValT v2);
    void                        done(int phase);
    bool                        hasNextPhase(int thisPhase);
    DstValT                     result() const;

    static HxString             className();
};

Example(s):

• instantiation : <none>, usage : <none>

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Return to patterns.

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