Function cvInitSparseMatIterator

deps/opencv/modules/core/src/array.cpp:614–638

CvSparseNode*
cvInitSparseMatIterator( const CvSparseMat* mat, CvSparseMatIterator* iterator )
{
    CvSparseNode* node = 0;
    int idx;

    if( !CV_IS_SPARSE_MAT( mat ))
        CV_Error( CV_StsBadArg, "Invalid sparse matrix header" );

    if( !iterator )
        CV_Error( CV_StsNullPtr, "NULL iterator pointer" );

    iterator->mat = (CvSparseMat*)mat;
    iterator->node = 0;

    for( idx = 0; idx < mat->hashsize; idx++ )
        if( mat->hashtable[idx] )
        {
            node = iterator->node = (CvSparseNode*)mat->hashtable[idx];
            break;
        }

    iterator->curidx = idx;
    return node;
}

#define ICV_SPARSE_MAT_HASH_MULTIPLIER  cv::SparseMat::HASH_SCALE