filter_width_d    912 ext/gd/libgd/gd_interpolation.c     const double filter_width_d = DEFAULT_BOX_RADIUS;
filter_width_d    918 ext/gd/libgd/gd_interpolation.c         width_d = filter_width_d / scale_d;
filter_width_d    921 ext/gd/libgd/gd_interpolation.c         width_d= filter_width_d;