import type { PdfElement } from '../../models/PdfElement.js';
/**
 * Element-level geometry and type helpers shared by the screenshot and page
 * continuity heuristics. Pure functions with no I/O so they can be unit-tested
 * without rendering a PDF.
 */
export interface NormalizedBox {
    top: number;
    left: number;
    width: number;
    height: number;
}
/**
 * Normalize a bounding box (array or object form) to { top, left, width, height }.
 * Mirrors the historical PdfCleanComposer behaviour (uses `||` fallbacks) so the
 * existing cleaning/cover paths keep the exact same numbers.
 */
export declare function normalizeBoundingBox(boundingBox: any): NormalizedBox;
export declare function isImageElement(element: PdfElement): boolean;
/**
 * Broad text test used by screenshot detection: paragraph / heading / text or an
 * h1..h6 tag. Matches the original PdfCleanComposer.isTextElement.
 */
export declare function isTextElement(element: PdfElement): boolean;
export declare function boundingBoxArea(element: PdfElement): number;
/**
 * Spread of an image cluster across the page (0-1), the minimum of the width and
 * height coverage of the union bounding box. High only when images are spread in
 * BOTH dimensions, which distinguishes a tiled cover from a single banner.
 */
export declare function computeImageDistribution(imageElements: PdfElement[], pageWidth: number, pageHeight: number): {
    distributionScore: number;
    widthCoverage: number;
    heightCoverage: number;
};
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