(svn r11947) -Feature: Make use of new sprites added by Action5 type 0D.

Tiles which only consist of shore do not flood anymore, instead they get removed if they are no longer connected to flooding water.

src/map_func.h

@@ -243,6 +243,20 @@ static inline TileIndexDiffC TileIndexDiffCByDiagDir(DiagDirection dir)
 	return _tileoffs_by_diagdir[dir];
 }
 
+/**
+ * Returns the TileIndexDiffC offset from a Direction.
+ *
+ * @param dir The given direction
+ * @return The offset as TileIndexDiffC value
+ */
+static inline TileIndexDiffC TileIndexDiffCByDir(Direction dir)
+{
+	extern const TileIndexDiffC _tileoffs_by_dir[DIR_END];
+
+	assert(IsValidDirection(dir));
+	return _tileoffs_by_dir[dir];
+}
+
 /**
  * Add a TileIndexDiffC to a TileIndex and returns the new one.
  *