274 }

   275 

   276 /**

   277  * Converts TrackBits to TrackdirBits while allowing both directions.

   278  *

   279  * @param bits The TrackBits

   280  * @return The TrackDirBits containing of bits in both directions.

   281  */

   282 static inline TrackdirBits TrackBitsToTrackdirBits(TrackBits bits)

   283 {

   284 	return (TrackdirBits)(bits * 0x101);

   285 }

   286 

   287 /**

   288  * Returns the present-trackdir-information of a TrackStatus.

   289  *

   290  * @param ts The TrackStatus returned by GetTileTrackStatus()

   291  * @return the present trackdirs

   292  */

   293 static inline TrackdirBits TrackStatusToTrackdirBits(TrackStatus ts)

   294 {

   295 	return (TrackdirBits)(ts & TRACKDIR_BIT_MASK);

   296 }

   297 

   298 /**

   299  * Returns the present-track-information of a TrackStatus.

   300  *

   301  * @param ts The TrackStatus returned by GetTileTrackStatus()

   302  * @return the present tracks

   303  */

   304 static inline TrackBits TrackStatusToTrackBits(TrackStatus ts)

   305 {

   306 	return TrackdirBitsToTrackBits(TrackStatusToTrackdirBits(ts));

   307 }

   308 

   309 /**

   310  * Returns the red-signal-information of a TrackStatus.

   311  *

   312  * Note: The result may contain red signals for non-present tracks.

   313  *

   314  * @param ts The TrackStatus returned by GetTileTrackStatus()

   315  * @return the The trackdirs that are blocked by red-signals

   316  */

   317 static inline TrackdirBits TrackStatusToRedSignals(TrackStatus ts)

   318 {

   319 	return (TrackdirBits)((ts >> 16) & TRACKDIR_BIT_MASK);

   320 }

   321 

   322 /**

   323  * Builds a TrackStatus

   324  *

   325  * @param trackdirbits present trackdirs

   326  * @param red_signals red signals

   327  * @return the TrackStatus representing the given information

   328  */

   329 static inline TrackStatus CombineTrackStatus(TrackdirBits trackdirbits, TrackdirBits red_signals)

   330 {

   331 	return (TrackStatus)(trackdirbits | (red_signals << 16));