export interface Point {
    x: number;
    y: number;
}
export interface Rect extends Point {
    width: number;
    height: number;
}
export type Tool = 'rectangle' | 'ellipse' | 'arrow' | 'pen' | 'mosaic' | 'text';
export interface Annotation {
    tool: Tool;
    points: Point[];
    color: string;
    size: number;
    text: string;
}
export interface History {
    done: Annotation[];
    undone: Annotation[];
}
export type HistoryAction = {
    type: 'add';
    mark: Annotation;
} | {
    type: 'undo' | 'redo' | 'reset';
};
export declare const clamp: (value: number, min: number, max: number) => number;
export declare function rectBetween(a: Point, b: Point): Rect;
export declare function imagePoint(x: number, y: number, bounds: {
    left: number;
    top: number;
    width: number;
    height: number;
}, width: number, height: number): Point;
export declare function moveSelection(r: Rect, dx: number, dy: number, width: number, height: number): Rect;
export declare function resizeSelection(r: Rect, handle: string, p: Point, width: number, height: number): Rect;
export declare function historyStep(state: History, action: HistoryAction): History;
/** Ordered front to back by the host; half-open edges avoid two hits at a shared border. */
export declare function windowAtPoint(windows: readonly Rect[], p: Point): Rect | undefined;
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