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#ifndef NUMPY_CORE_INCLUDE_NUMPY__NEIGHBORHOOD_IMP_H_ #error You should not include this header directly #endif /* * Private API (here for inline) */ static NPY_INLINE int _PyArrayNeighborhoodIter_IncrCoord(PyArrayNeighborhoodIterObject* iter); /* * Update to next item of the iterator * * Note: this simply increment the coordinates vector, last dimension * incremented first , i.e, for dimension 3 * ... * -1, -1, -1 * -1, -1, 0 * -1, -1, 1 * .... * -1, 0, -1 * -1, 0, 0 * .... * 0, -1, -1 * 0, -1, 0 * .... */ #define _UPDATE_COORD_ITER(c) \ wb = iter->coordinates[c] < iter->bounds[c][1]; \ if (wb) { \ iter->coordinates[c] += 1; \ return 0; \ } \ else { \ iter->coordinates[c] = iter->bounds[c][0]; \ } static NPY_INLINE int _PyArrayNeighborhoodIter_IncrCoord(PyArrayNeighborhoodIterObject* iter) { npy_intp i, wb; for (i = iter->nd - 1; i >= 0; --i) { _UPDATE_COORD_ITER(i) } return 0; } /* * Version optimized for 2d arrays, manual loop unrolling */ static NPY_INLINE int _PyArrayNeighborhoodIter_IncrCoord2D(PyArrayNeighborhoodIterObject* iter) { npy_intp wb; _UPDATE_COORD_ITER(1) _UPDATE_COORD_ITER(0) return 0; } #undef _UPDATE_COORD_ITER /* * Advance to the next neighbour */ static NPY_INLINE int PyArrayNeighborhoodIter_Next(PyArrayNeighborhoodIterObject* iter) { _PyArrayNeighborhoodIter_IncrCoord (iter); iter->dataptr = iter->translate((PyArrayIterObject*)iter, iter->coordinates); return 0; } /* * Reset functions */ static NPY_INLINE int PyArrayNeighborhoodIter_Reset(PyArrayNeighborhoodIterObject* iter) { npy_intp i; for (i = 0; i < iter->nd; ++i) { iter->coordinates[i] = iter->bounds[i][0]; } iter->dataptr = iter->translate((PyArrayIterObject*)iter, iter->coordinates); return 0; }
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