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cvGetDiag(const CvArr* arr, CvMat* submat, int diag=0)
OUTPUT: submat
OUTPUT: RETVAL ST(0) = SvREFCNT_inc(ST(1));

#C# int cvGetDims(const CvArr* arr, int* sizes=NULL)
void
cvGetDims(const CvArr* arr, ...)
ALIAS: GetDims = 1
ALIAS: getDims = 2
PROTOTYPE: $;\@
PPCODE:
	const int verbose = 0;
	int sizes[CV_MAX_DIM]; int i;
	int dims = cvGetDims(arr, sizes);
	if (items == 2) {
		AV* av_sizes = (AV*)SvRV(ST(1)); av_clear(av_sizes);
		for (i = 0; i < dims; i++) {
			av_push(av_sizes, newSViv(sizes[i]));
		}
	}
	I32 gimme = GIMME_V; /* wantarray */