xf                750 ext/gd/libgd/gd_interpolation.c 	const double xf = x - (double)sx;
xf                752 ext/gd/libgd/gd_interpolation.c 	const double nxf = (double) 1.0 - xf;
xf                754 ext/gd/libgd/gd_interpolation.c 	const double m1 = xf * yf;
xf                756 ext/gd/libgd/gd_interpolation.c 	const double m3 = xf * nyf;