Change: Remove direction parameter from Vehicle::UpdateDeltaXY. (#6792)

The value is either unused or always the same as this->direction.

src/vehicle_base.h

@@ -366,9 +366,8 @@ public:
 	/**
 	 * Updates the x and y offsets and the size of the sprite used
 	 * for this vehicle.
-	 * @param direction the direction the vehicle is facing
 	 */
-	virtual void UpdateDeltaXY(Direction direction) {}
+	virtual void UpdateDeltaXY() {}
 
 	/**
 	 * Determines the effective direction-specific vehicle movement speed.
@@ -1139,7 +1138,7 @@ struct SpecializedVehicle : public Vehicle {
 
 		/* Explicitly choose method to call to prevent vtable dereference -
 		 * it gives ~3% runtime improvements in games with many vehicles */
-		if (update_delta) ((T *)this)->T::UpdateDeltaXY(this->direction);
+		if (update_delta) ((T *)this)->T::UpdateDeltaXY();
 		VehicleSpriteSeq seq;
 		((T *)this)->T::GetImage(this->direction, EIT_ON_MAP, &seq);
 		if (force_update || this->sprite_seq != seq) {