/**
 * Crop Module — handles free crop, aspect-ratio locked crop, and crop application
 */
import { fabric } from 'fabric';
export declare class CropModule {
    private canvas;
    private cropRect;
    private overlay;
    private aspectRatio;
    private isActive;
    private imageObject;
    private minCropSize;
    constructor(canvas: fabric.Canvas);
    /**
     * Activate crop mode with an optional aspect ratio
     */
    activate(imageObject: fabric.Image, ratio?: number | null): void;
    /**
     * Deactivate crop mode and remove overlays
     */
    deactivate(): void;
    /**
     * Apply the crop — returns cropped image data URL plus the geometry
     * needed by the caller to keep annotations aligned after the base
     * image is replaced.
     *
     *   cropRectCanvas — bounding box of the crop rect in the OLD canvas
     *                    coordinate system (post-scale).
     *   oldDisplayScaleX/Y — the base image's display scale at crop time
     *                        (canvas-pixels per image-pixel).
     */
    applyCrop(): {
        dataUrl: string;
        width: number;
        height: number;
        cropRectCanvas: {
            left: number;
            top: number;
            width: number;
            height: number;
        };
        oldDisplayScaleX: number;
        oldDisplayScaleY: number;
    } | null;
    /**
     * Set the crop aspect ratio.
     *
     * Bug fix: previously this kept the current rect width and derived
     * `height = width / ratio` without checking whether the derived height
     * still fit inside the image bounds. Picking e.g. 4:3 on a 16:9 photo
     * produced a rect that overflowed the image vertically — `constrainCropRect`
     * only clamps position, not size, so the overflow stayed and `Apply Crop`
     * exported an image with blank strips. The result didn't look like the
     * chosen aspect ratio.
     *
     * Now we shrink (w, h) proportionally so BOTH dimensions fit the image
     * while exactly matching `ratio`, and we re-centre the rect on its
     * previous centre so changing the ratio feels stable.
     */
    setAspectRatio(ratio: number | null): void;
    getIsActive(): boolean;
    private getImageBounds;
    private constrainCropRect;
    private constrainCropScale;
    private addGridLines;
}