export type SpiralGalleryItem = string | {
    src: string;
    alt?: string;
    id?: string | number;
    crossOrigin?: '' | 'anonymous' | 'use-credentials';
    referrerPolicy?: HTMLImageElement['referrerPolicy'];
};
export type NormalizedSpiralGalleryItem = {
    src: string;
    alt: string;
    id: string;
    crossOrigin?: '' | 'anonymous' | 'use-credentials';
    referrerPolicy?: HTMLImageElement['referrerPolicy'];
};
export type SpiralGalleryConfig = {
    imageHeight?: number;
    curvature?: number;
    gapSize?: number;
    spiralRadius?: number;
    spiralTurns?: number;
    spiralHeight?: number;
    centerX?: number;
    centerY?: number;
    centerZ?: number;
    cameraFov?: number;
    cameraY?: number;
    cameraZ?: number;
    baseRotationX?: number;
    baseRotationZ?: number;
    meshRotationX?: number;
    minZoom?: number;
    maxZoom?: number;
    zoomStep?: number;
    masterTextureHeight?: number;
};
export type SpiralGalleryInertia = {
    friction?: number;
    strength?: number;
    maxSpeed?: number;
    directionSmoothing?: number;
    scrollSensitivity?: number;
};
type SpiralGalleryRuntimeOptions = {
    root: HTMLElement;
    canvas: HTMLCanvasElement;
    items: readonly NormalizedSpiralGalleryItem[];
    config?: SpiralGalleryConfig;
    inertia?: SpiralGalleryInertia;
    pixelRatioCap?: number;
};
export declare const normalizeSpiralGalleryItems: (items: readonly SpiralGalleryItem[]) => NormalizedSpiralGalleryItem[];
export declare const canUseSpiralGalleryWebGL: () => boolean;
export declare class SpiralGalleryRuntime {
    private readonly root;
    private readonly canvas;
    private readonly items;
    private readonly config;
    private readonly inertia;
    private readonly scene;
    private readonly tiltGroup;
    private readonly dragRotation;
    private readonly baseRotation;
    private readonly previousPointer;
    private readonly touch;
    private camera;
    private renderer;
    private spiralMesh;
    private material;
    private masterTexture;
    private imageRatios;
    private resizeObserver;
    private frameId;
    private resizeFrameId;
    private disposed;
    private isDragging;
    private scrollOffset;
    private targetVelocity;
    private currentVelocity;
    private wheelAcceleration;
    private zoomLevel;
    constructor({ root, canvas, items, config, inertia, pixelRatioCap, }: SpiralGalleryRuntimeOptions);
    init(): Promise<boolean>;
    zoomBy(direction: -1 | 1): void;
    dispose(): void;
    private getSize;
    private rebuildGeometry;
    private updateTextureOffset;
    private resize;
    private scheduleResize;
    private start;
    private animate;
    private updateInertia;
    private addListeners;
    private removeListeners;
    private handleWheel;
    private handlePointerDown;
    private handlePointerMove;
    private handlePointerUp;
    private handlePointerCancel;
    private stopDragging;
    private handleTouchStart;
    private handleTouchMove;
    private handleTouchEnd;
    private applyTilt;
}
export declare const createSpiralGalleryRuntime: (options: SpiralGalleryRuntimeOptions) => Promise<SpiralGalleryRuntime | null>;
export {};