XR               1855 ext/gd/libgd/gd.c #define FILL_PUSH(Y, XL, XR, DY) \
XR               1857 ext/gd/libgd/gd.c     {sp->y = Y; sp->xl = XL; sp->xr = XR; sp->dy = DY; sp++;}
XR               1859 ext/gd/libgd/gd.c #define FILL_POP(Y, XL, XR, DY) \
XR               1860 ext/gd/libgd/gd.c     {sp--; Y = sp->y+(DY = sp->dy); XL = sp->xl; XR = sp->xr;}