/** Normalised crop rectangle (each field in the closed interval [0, 1]). */
export interface CropRect {
    x: number;
    y: number;
    width: number;
    height: number;
}
export declare const clamp01: (v: number) => number;
/**
 * Clamp a rectangle so it stays within the unit box and never shrinks below
 * `minSize` on either axis.
 */
export declare function clampRect(rect: CropRect, minSize: number): CropRect;
/**
 * Coerce a rectangle's height to honour a pixel aspect ratio
 * (`width_px / height_px`), anchored at its top-inline-start corner. `boxW` /
 * `boxH` are the displayed image box's pixel dimensions. A non-positive aspect
 * or unmeasured box returns the rectangle unchanged.
 */
export declare function applyAspect(rect: CropRect, aspect: number | undefined, boxW: number, boxH: number): CropRect;
/** A sensible centred default — an 80% box, aspect-coerced when one is set. */
export declare function defaultCrop(aspect: number | undefined, boxW: number, boxH: number): CropRect;
/** Round each field to whole percentages — used for the live-region readout. */
export declare function toPercent(rect: CropRect): {
    x: number;
    y: number;
    width: number;
    height: number;
};
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