/**
 * Flips an image vertically and horizontally, equivalent to a 180° rotation.
 */
export declare const vh: import("./imageFormatUtils").InPlaceImageTransform<[], void>;
export declare function vhRGBA(srcImageData: ImageData, dstImageData?: ImageData): void;
export declare function vhGray(srcImageData: ImageData, dstImageData?: ImageData): void;