/**
 * Ruled frames (#914): `FrameConfig.rules` draws one rule at the foot of
 * each line slot of a frame's content box, as many as its height holds, so
 * an answer space follows its frame: an `'auto'` frame given
 * `:::space{lines=4}` gets four rules, one that grows gets more.
 *
 * A frame that holds a box (content, or a style) carries its rules on the
 * box's decoration (`VDTBlock.designOverlay`), over its background and
 * under its text, in the box's laid-out coordinates (a frame whose text the
 * ladder scales is laid out `1 / scale` as large: the rules keep their
 * drawn pitch and thickness). An empty frame carries them on
 * `VDTFrame.rules` in page coordinates; the template's decoration paints
 * them (`headerFooter.ts`).
 */
import type { ResolvedCalloutStyleConfig } from '../types.js';
import type { VDTDesignRuleBlock } from '../vdt.js';
import type { Rect } from './geometry.js';
import type { FrameRulesConfig } from './types.js';
/** The rules' colour when the frame sets none. */
export declare const DEFAULT_RULE_COLOR = "#9a9a9a";
/** The leading of a frame's text: its style's body (px). */
export declare function frameLinePx(style: ResolvedCalloutStyleConfig, dpi: number): number;
/**
 * The rules across `inner` (a content box): one at the foot of each slot
 * of the pitch, as many as fit, each `inset` short of both sides. Lengths
 * the frame writes are divided by `scale` (the box is laid out that much
 * larger and painted at `scale`); the `'line'` pitch is the text's own,
 * `linePx`, which scales with it.
 */
export declare function frameRuleBlocks(rules: FrameRulesConfig, inner: Rect, linePx: number, scale: number, dpi: number, emPx: number): VDTDesignRuleBlock[];
//# sourceMappingURL=rules.d.ts.map