x2_x 380 ext/gd/libgd/gd_interpolation.c const double x2_x = x2 * x; x2_x 382 ext/gd/libgd/gd_interpolation.c if (x <= 1.0) return ((4.0 / 3.0)* x2_x - (7.0 / 3.0) * x2 + 1.0); x2_x 383 ext/gd/libgd/gd_interpolation.c if (x <= 2.0) return (- (7.0 / 12.0) * x2_x + 3 * x2 - (59.0 / 12.0) * x + 2.5); x2_x 384 ext/gd/libgd/gd_interpolation.c if (x <= 3.0) return ( (1.0/12.0) * x2_x - (2.0 / 3.0) * x2 + 1.75 * x - 1.5);