279     int ady=abs(dy);  in render_point()  local
280     int err=ady*(x-x0);  in render_point()
365   int ady=abs(dy);  in render_line()  local
372   ady-=abs(base*adx);  in render_line()
380     err=err+ady;  in render_line()
394   int ady=abs(dy);  in render_line0()  local
401   ady-=abs(base*adx);  in render_line0()
409     err=err+ady;  in render_line0()
536   int ady=abs(dy);  in inspect_error()  local
546   ady-=abs(base*adx);  in inspect_error()
557     err=err+ady;  in inspect_error()