/**
 * Lanczos filter function for downscaling
 * @param source - the source image
 * @param dest - the destination image
 * @param sx - source starting x point [Default: 0]
 * @param sy - source starting y point [Default: 0]
 * @param sw - source width to use [Default: source width - sx]
 * @param sh - source height to use [Default: source height - sy]
 * @param dx - destination starting x point [Default: 0]
 * @param dy - destination starting y point [Default: 0]
 * @param dw - destination width to use [Default: destination width - dx]
 * @param dh - destination height to use [Default: destination height - dy]
 * @param use2 - use 2nd lanczos filter instead of 3rd [Default: false]
 */
export declare function lanczos(source: ImageData, dest: ImageData, sx?: number, sy?: number, sw?: number, sh?: number, dx?: number, dy?: number, dw?: number, dh?: number, use2?: boolean): void;
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