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N phase, loop neighbourhood operation with two extra images

Pseudo code of the operation:

NeighbourhoodOp(Dst, Src, Ext, Ext2, Ngb)
{
    foreach d, s, e, e2 in Dst, Src, Ext, Ext2 {
        phase = 1;
        do {
            Ngb.init(phase, s.x, s.y, Src(s), Ext(e), Ext2(e2));
            foreach n in Ngb.size()
                Ngb.next(n.x, n.y, Src(s - (Ngb.size()/2) + n),
                                   Ext(e - (Ngb.size()/2) + n),
                                   Ext2(e2 - (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 Ext2ValT>
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,
                           Ext2ValT v3);
    void              next(int nx, int ny, SrcValT v1, ExtValT v2, Ext2ValT v3);
    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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