I am using OpenCV 2.4.6, I am sorry if this was corrected in the most recent versions.
If I call ellipse() as:
ellipse(image, RotatedRect(Point2f(-78877.320,-79104.328),Size2f(1.0649987e-010f,3.1949962e-010f),0.0f), CV_RGB(255, 0, 0), 1, 8); // OpenCV Bug discovered!
being image a 640x480 image, my program crashes.
ellipse() calls EllipeseEx() who calls ellipse2Poly() who crashes.
ellipse() does:
Point center(cvRound(box.center.x*(1 << XY_SHIFT)), cvRound(box.center.y*(1 << XY_SHIFT)));
which makes center.x and center.y equals to INT_MIN. this way ellipse2Poly() crashes when it tries in it's last line to acessa an empty vector [0] position in:
if( pts.size() < 2 )
pts.push_back(pts[0]);
since for this case
if( pt != prevPt )
pts.push_back(pt);
Is never != so the push_back() is never executed.
The code should be changed to
if( pts.size() < 2 && pts.size() > 0 )
pts.push_back(pts[0]);
So this way, the vector will be never acessed in case it's empty, crashing the program.
I am sorry to not submit this to the repository myself, I just can't upload that code right now.