offset_x          873 ext/gd/libgd/gd.h int gdAffineTranslate (double dst[6], const double offset_x, const double offset_y);
offset_x          269 ext/gd/libgd/gd_matrix.c int gdAffineTranslate (double dst[6], const double offset_x, const double offset_y)
offset_x          275 ext/gd/libgd/gd_matrix.c 	dst[4] = offset_x;