quartIn           155 src/swfc-history.c 	case IF_QUART_IN: return quartIn(fraction, p1, p2 - p1, inter->slope);
quartIn            78 src/swfc-interpolation.c     return quartIn(1 - fraction, start + delta, -delta, slope);
quartIn            84 src/swfc-interpolation.c         return quartIn(2 * fraction, start, delta / 2, slope);
quartIn            78 src/swfc-interpolation.h float quartIn(float fraction, float start, float delta, float slope);