backIn            173 src/swfc-history.c 		case IF_BACK_IN: return backIn(fraction, p1, p2 - p1, inter->speed);
backIn            189 src/swfc-interpolation.c     return backIn(1 - fraction, start + delta, -delta, speed);
backIn            195 src/swfc-interpolation.c         return backIn(2 * fraction, start, delta / 2, speed);
backIn            102 src/swfc-interpolation.h float backIn(float fraction, float start, float delta, float speed);