Fix crash when eye roi outside of view

TODO.md

@@ -9,7 +9,6 @@
 - model copyright and authors
 
 ## Bugs
-- crash when eye goes outside of roi
 - incorrect appdata location on Windows
 
 # Whenever

src/cv.cpp

@@ -170,13 +170,20 @@ void cvFrame() {
 		cv::rectangle(frame, eyeRect, cv::Scalar(255, 255, 255));
 
 		cv::Mat eyeROI;
+		glm::vec2 eyeVector(0,0);
+
+		// prevent assertion failed when eye is partly outside of image
+		if(eyeRect.x < 0 || eyeRect.x >= gray.cols || eyeRect.y < 0 || eyeRect.y >= gray.rows ||
+			eyeRect.x + eyeRect.width >= gray.cols || eyeRect.y - eyeRect.height >= gray.rows) goto noeye;
+
 		eyeROI = gray(eyeRect);
 
-		glm::vec2 eyeVector(0,0);
 		if (!optData.noEyes) {
 			eyeVector = eyeDirection(eyeROI);	// run pupil tracking algorithm and get look direction
 		}
 
+noeye:
+
 		//send control information to graphics
 		float faceSize = landmarks[biggestFace][14].x - landmarks[biggestFace][2].x;