collision detection in FHBG SDL

int __pure__ ChkCollision (Object *Obj1, Object *Obj2) {
  int LeftA, RightA, TopA, BottomA;
  int LeftB, RightB, TopB, BottomB;

  LeftA = Obj1->PosX>>8;
  RightA = LeftA+Obj1->Width-1;
  TopA = Obj1->PosY>>8;
  BottomA = TopA+Obj1->Height-1;

  LeftB = Obj2->PosX>>8;
  RightB = LeftB+Obj2->Width-1;
  TopB = Obj2->PosY>>8;
  BottomB = TopB+Obj2->Width-1;

  if(LeftA >= LeftB
  && LeftA <= RightB
  && TopA >= TopB
  && TopA <= BottomB)
    return 1;
  if(LeftB >= LeftA
  && LeftB <= RightA
  && TopB >= TopA
  && TopB <= BottomA)
    return 1;
  return 0;
}