import { fabric } from "fabric";
import type { Bounds, CanvasSize } from "../types";
/**
 * Calculate responsive canvas size based on viewport
 */
export declare function calculateCanvasSize(viewportWidth: number, viewportHeight: number, options?: {
    mobileBreakpoint?: number;
    tabletBreakpoint?: number;
    mobileMargin?: number;
    tabletMargin?: number;
    desktopMargin?: number;
    mobileAspectRatio?: number;
    defaultAspectRatio?: number;
    minWidth?: number;
    minHeight?: number;
}): CanvasSize;
/**
 * Get bounds of an image on canvas
 */
export declare function getImageBounds(image: fabric.Image | null): Bounds | null;
/**
 * Calculate scale to fit image within bounds with padding
 */
export declare function calculateFitScale(imageWidth: number, imageHeight: number, canvasWidth: number, canvasHeight: number, padding?: number): number;
/**
 * Calculate center position for an object on canvas
 */
export declare function calculateCenterPosition(objectWidth: number, objectHeight: number, canvasWidth: number, canvasHeight: number): {
    x: number;
    y: number;
};
/**
 * Lock an image object to prevent user manipulation
 */
export declare function lockImage(image: fabric.Image): void;
/**
 * Create a locked original image from URL
 */
export declare function loadImageToCanvas(canvas: fabric.Canvas, imageUrl: string, padding?: number): Promise<fabric.Image>;
/**
 * Clamp zoom level within bounds
 */
export declare function clampZoom(zoom: number, minZoom?: number, maxZoom?: number): number;
/**
 * Animate zoom to target level
 */
export declare function animateZoomTo(canvas: fabric.Canvas, targetZoom: number, duration?: number, minZoom?: number, maxZoom?: number): void;
/**
 * Get viewport center point in canvas coordinates
 */
export declare function getViewportCenter(canvas: fabric.Canvas): fabric.Point;
/**
 * Calculate intersection between two rectangles
 */
export declare function calculateIntersection(rect1: Bounds, rect2: Bounds): Bounds | null;
/**
 * Convert canvas coordinates to image pixel coordinates
 */
export declare function canvasToImageCoords(canvasX: number, canvasY: number, image: fabric.Image): {
    x: number;
    y: number;
};
/**
 * Convert image pixel coordinates to canvas coordinates
 */
export declare function imageToCanvasCoords(imageX: number, imageY: number, image: fabric.Image): {
    x: number;
    y: number;
};
/**
 * Export canvas region to data URL
 */
export declare function exportCanvasRegion(canvas: fabric.Canvas, bounds: Bounds, format?: string, quality?: number): string;
/**
 * Convert data URL to Blob
 */
export declare function dataURLToBlob(dataURL: string): Promise<Blob>;