Function cvFastArctan

deps/opencv/modules/core/src/mathfuncs.cpp:2233–2233

CV_IMPL float cvCbrt(float value) { return cv::cubeRoot(value); }
CV_IMPL float cvFastArctan(float y, float x) { return cv::fastAtan2(y, x); }

CV_IMPL void
cvCartToPolar( const CvArr* xarr, const CvArr* yarr,