/**
 * Painting one right-to-left run of a design text or a chip on the canvas
 * (`VDTDesignTextRun.rtl`, `VDTChipRun.rtl`).
 *
 * The page paints with `direction = 'ltr'` (see `renderPageToCanvas`), so a
 * run of Arabic letters alone already shapes right to left, but its
 * neutral characters (brackets, a full stop at its end) would be ordered
 * and mirrored as in a left-to-right paragraph. A run flagged `rtl` is
 * painted with the context set right to left and aligned on its left edge,
 * so it lands in the box the layout measured. A run that holds a letter of
 * a joining script (`text`) is painted with no tracking: Arabic letters
 * are never spaced apart, and the measurer left such a text untracked
 * (`measure/joining.ts`). A Hebrew run keeps the tracking it was measured
 * with (#703; up to postext 1.27 every right-to-left run lost it). Inside
 * a mirrored flow the frame's `fillText` interception reads the same
 * direction and alignment, so the run is turned back about the same box.
 */
/** Run `paint` with the context set to paint a right-to-left run from its
 *  left edge when `rtl`, its tracking lifted when `text`, the run's, holds
 *  a letter of a joining script; just run it otherwise. */
export declare function paintRunInDirection(ctx: CanvasRenderingContext2D, rtl: boolean | undefined, paint: () => void, text: string): void;
/** The indices of `n` runs in paint order: `order` when it lists them all,
 *  else 0 … n − 1. */
export declare function runPaintOrder(order: readonly number[] | undefined, n: number): readonly number[];
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