import { Texture } from 'three';
export interface PreviewItem {
    key: string;
    texture: Texture;
    x: number;
    y: number;
    width: number;
    height: number;
    /** Background color for this camera preview */
    backgroundColor: string;
    /** Background opacity for this camera preview (0-1) */
    backgroundOpacity: number;
}
export type PreviewPosition = 'bottom-left' | 'bottom-right' | 'top-left' | 'top-right';
export interface UsePreviewLayoutOptions {
    previewHeight: number;
    gap: number;
    margin: number;
    position?: PreviewPosition;
}
export interface UsePreviewLayoutResult {
    previews: PreviewItem[];
    isRight: boolean;
    isTop: boolean;
}
/**
 * Hook to calculate camera preview layout.
 * Returns preview items with pixel coordinates for positioning.
 */
export declare function usePreviewLayout({ previewHeight, gap, margin, position, }: UsePreviewLayoutOptions): UsePreviewLayoutResult;
/**
 * Convert pixel position to NDC coordinates.
 * For aspect-corrected Hud: horizontal range [-aspect, aspect], vertical range [-1, 1]
 */
export declare function pixelToNDC(preview: PreviewItem, canvasWidth: number, canvasHeight: number, aspect?: number, isRight?: boolean, isTop?: boolean): {
    x: number;
    y: number;
    width: number;
    height: number;
};