+ * @note If the number of characters is zero the directions buffer is cleared.
+ *
+ * @param[in] directions The directions of the characters.
+ * @param[in] numberOfCharacters The number of characters.
+ */
+ void SetCharacterDirections( const CharacterDirection* const directions,
+ Length numberOfCharacters );
+
+ /**
+ * @brief Retrieves the direction of the characters.
+ *
+ * It sets @e true for right to left characters and @e false for left to right.