(svn r12199) -Codechange: Remove magic around the results of GetTileTrackStatus().

src/track_func.h

@@ -273,6 +273,64 @@ static inline TrackBits TrackdirBitsToTrackBits(TrackdirBits bits)
 	return (TrackBits)((bits | (bits >> 8)) & TRACK_BIT_MASK);
 }
 
+/**
+ * Converts TrackBits to TrackdirBits while allowing both directions.
+ *
+ * @param bits The TrackBits
+ * @return The TrackDirBits containing of bits in both directions.
+ */
+static inline TrackdirBits TrackBitsToTrackdirBits(TrackBits bits)
+{
+	return (TrackdirBits)(bits * 0x101);
+}
+
+/**
+ * Returns the present-trackdir-information of a TrackStatus.
+ *
+ * @param ts The TrackStatus returned by GetTileTrackStatus()
+ * @return the present trackdirs
+ */
+static inline TrackdirBits TrackStatusToTrackdirBits(TrackStatus ts)
+{
+	return (TrackdirBits)(ts & TRACKDIR_BIT_MASK);
+}
+
+/**
+ * Returns the present-track-information of a TrackStatus.
+ *
+ * @param ts The TrackStatus returned by GetTileTrackStatus()
+ * @return the present tracks
+ */
+static inline TrackBits TrackStatusToTrackBits(TrackStatus ts)
+{
+	return TrackdirBitsToTrackBits(TrackStatusToTrackdirBits(ts));
+}
+
+/**
+ * Returns the red-signal-information of a TrackStatus.
+ *
+ * Note: The result may contain red signals for non-present tracks.
+ *
+ * @param ts The TrackStatus returned by GetTileTrackStatus()
+ * @return the The trackdirs that are blocked by red-signals
+ */
+static inline TrackdirBits TrackStatusToRedSignals(TrackStatus ts)
+{
+	return (TrackdirBits)((ts >> 16) & TRACKDIR_BIT_MASK);
+}
+
+/**
+ * Builds a TrackStatus
+ *
+ * @param trackdirbits present trackdirs
+ * @param red_signals red signals
+ * @return the TrackStatus representing the given information
+ */
+static inline TrackStatus CombineTrackStatus(TrackdirBits trackdirbits, TrackdirBits red_signals)
+{
+	return (TrackStatus)(trackdirbits | (red_signals << 16));
+}
+
 /**
  * Maps a trackdir to the trackdir that you will end up on if you go straight
  * ahead.