typedef uint32_t BidirectionalLineRunIndex; ///< An index into an array of bidirectional line info.
typedef uint32_t LineIndex; ///< An index into an array of lines.
typedef uint32_t ParagraphRunIndex; ///< An index into an array of paragraphs.
typedef uint32_t BidirectionalLineRunIndex; ///< An index into an array of bidirectional line info.
typedef uint32_t LineIndex; ///< An index into an array of lines.
typedef uint32_t ParagraphRunIndex; ///< An index into an array of paragraphs.