cvSetOpenGlDrawCallback  211 modules/highgui/include/opencv2/highgui/highgui_c.h CVAPI(void) cvSetOpenGlDrawCallback(const char* window_name, CvOpenGlDrawCallback callback, void* userdata CV_DEFAULT(NULL));
cvSetOpenGlDrawCallback  238 modules/highgui/src/window.cpp     cvSetOpenGlDrawCallback(name.c_str(), callback, userdata);