/** Axis-aligned bounding box for a rect (x, y in pixels, w/h in pixels). */
export type BBox = {
    x: number;
    y: number;
    w: number;
    h: number;
};
/**
 * True when two boxes overlap along the y axis (half-open interval). Used as
 * a cheap filter before checking horizontal occlusion.
 */
export declare function verticallyOverlaps(a: BBox, b: BBox): boolean;
/**
 * Width of the leftmost horizontal segment of `bbox` that is not covered by
 * any of `blockers` at overlapping y. Returns `0` when the leading edge is
 * itself covered — the caller uses that as a signal to skip the label.
 *
 * `blockers` are treated as later-painted rects, i.e. drawn on top; the
 * caller must supply them in that order (see `RectLabelOverlay`).
 */
export declare function usableLeftSegmentWidth(bbox: BBox, blockers: BBox[]): number;
/**
 * Count of characters in `text` that are not the ellipsis. Used to skip labels
 * where truncation would leave only visual noise (`…`, `…A`).
 */
export declare function countRealChars(text: string): number;
//# sourceMappingURL=rect-label-utils.d.ts.map