/**
 * Justification tracking (`bodyText.maxJustifyTracking`, EF-65): the
 * tracking a line of a found break sequence takes, worked out again from
 * its items exactly as the breaker weighed it (see `adjustLine`), and spread
 * on the widths of its letters.
 */
import type { VDTLineSegment } from '../vdt.js';
import type { KPItem } from './types.js';
/**
 * Tracking (px after every character; negative tightens) of the line made
 * of `items[lineStart..breakAt)` broken at `breakAt`, `lineWidth` px wide,
 * with `trackingPerChar` px a character at most. 0 when its word spaces
 * alone set it within their limits, or it may take none.
 */
export declare function lineTracking(items: readonly KPItem[], lineStart: number, breakAt: number, lineWidth: number, trackingPerChar: number): number;
/** Add `tracking` px a grapheme to the width of every text segment (word,
 *  reference, script run) of a line; spaces, formulas, swatches and chips
 *  keep theirs, and so does a word of a joining script, which the breaker
 *  counted no character of (its letters connect). Two stacked scripts advance as far as the longer run: the
 *  first keeps its zero width, the second takes the tracking of the longer
 *  of the two (as the breaker counted their characters). Returns the width
 *  added to the line. The change is linear in `tracking`, so the same call
 *  with `-tracking` undoes it exactly (`raggedLooseLines`). */
export declare function trackSegments(segments: VDTLineSegment[], tracking: number): number;
//# sourceMappingURL=tracking.d.ts.map