opencv/imgproc.go
func DrawContours(image *IplImage, contours *Seq, externalColor, holeColor Scalar, maxLevel, thickness, lineType int, offset Point) {
	C.cvDrawContours(
		unsafe.Pointer(image),
		(*C.CvSeq)(contours),
		(C.CvScalar)(externalColor),
		(C.CvScalar)(holeColor),
		C.int(maxLevel),
		C.int(thickness),
		C.int(lineType),
		C.cvPoint(C.int(offset.X), C.int(offset.Y)))
}
func DrawContours(image *IplImage, contours *Seq, externalColor, holeColor Scalar, maxLevel, thickness, lineType int, offset Point) {
	C.cvDrawContours(
		unsafe.Pointer(image),
		(*C.CvSeq)(contours),
		(C.CvScalar)(externalColor),
		(C.CvScalar)(holeColor),
		C.int(maxLevel),
		C.int(thickness),
		C.int(lineType),
		C.cvPoint(C.int(offset.X), C.int(offset.Y)))
}
//cvDrawContours(CvArr* img, CvSeq* contour, CvScalar externalColor, CvScalar holeColor, int maxLevel, int thickness=1, int lineType=8