/**
 * The rule over emphasised words (`bodyText.emphasis: 'overline'`, #376):
 * the khaṭṭ fawqī Arabic books draw over a word to stress it, where Latin
 * type would slant it. The `*…*` runs of such a block are set upright
 * (their italic faces are the regular ones, `pipeline/styles.ts`); once
 * the document is laid out each run of them gets a rule as a
 * `VDTLine.marks` line, which every renderer draws as it draws the
 * Chinese marks.
 *
 * The rule stands a little over the run's ink: over the letters, and over
 * their vowel marks when they carry any. A run is the emphasised words
 * that follow each other along the line (the flow order `VDTLine.order`
 * followed), with the spaces between them; a run broken over two lines
 * gets a rule on each.
 */
import type { VDTDocument, VDTLine, VDTLineMark } from './vdt.js';
import { segmentPositions } from './cjkMarks.js';
type BlockLike = Parameters<typeof segmentPositions>[1];
/** The overline marks of a line of a block set with
 *  `emphasis: 'overline'`, relative to the line; empty when it has no
 *  emphasised word. */
export declare function overlineMarks(line: VDTLine, block: BlockLike, color?: string): VDTLineMark[];
/** Draw the rules of every block set with `emphasis: 'overline'` (see the
 *  module comment), in the block's emphasis colour. */
export declare function overlineEmphasis(doc: VDTDocument): void;
export {};
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