import type { Resource, ResourceSafeArea } from '../types.js';
/** The resource's safe area, clamped to the picture, or `undefined` when it
 *  has none, it is not a picture, or the area covers the whole picture
 *  (which leaves no freedom). */
export declare function resourceSafeArea(resource: Resource): ResourceSafeArea | undefined;
/** Clamp a safe area to the unit square; `undefined` for a malformed one or
 *  one that covers the whole picture. */
export declare function normalizeSafeArea(area: ResourceSafeArea | undefined): ResourceSafeArea | undefined;
/** Body height range of a picture `bodyWidth` wide whose intrinsic size is
 *  `iw` × `ih`: from its safe area's height (cropping top and bottom) to
 *  its safe area's width (cropping the sides). */
export declare function safeAreaHeightRange(iw: number, ih: number, area: ResourceSafeArea, bodyWidth: number): {
    min: number;
    max: number;
};
/** The part of the picture shown when a body `bodyWidth` wide is set
 *  `bodyHeight` tall: the whole height with the sides cropped when the body
 *  is taller than the picture's own ratio, the whole width with top and
 *  bottom cropped when it is shorter. `undefined` when nothing is cropped. */
export declare function safeAreaSource(iw: number, ih: number, area: ResourceSafeArea, bodyWidth: number, bodyHeight: number): ResourceSafeArea | undefined;
/** The box the whole picture covers when its `source` part fills
 *  `x, y, w, h`: what a renderer draws, clipped to the body. */
export declare function uncroppedPictureBox(x: number, y: number, w: number, h: number, source: ResourceSafeArea): {
    x: number;
    y: number;
    width: number;
    height: number;
};
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