import { type DataTextureLoaderTexData, type WebGPURenderer } from 'three/webgpu';
import { type HDRInput } from './nodes/SDRRenditionNode';
/**
 * Finds the min or max value of each RGB channel of an HDR image, on the GPU.
 *
 * The image is reduced by 2x2 cells until it's 1x1, then the single remaining pixel is read back.
 * Negative values are ignored when looking for the max, values above 65504 (max half float) when looking for the min.
 *
 * @category Utility
 * @group Utility
 *
 * @example
 * import { findTextureMinMax } from '@monogrid/gainmap-js/encode/webgpu'
 *
 * const [r, g, b] = await findTextureMinMax(exrTexture, 'max', renderer)
 * const maxContentBoost = Math.max(r, g, b)
 *
 * @param image the HDR image: a texture, raw texture data or a TSL node (which requires `size`)
 * @param mode
 * @param renderer
 * @param size size of the image, required when the image is a generic node
 * @throws {Error} if the image is a generic node and `size` is not provided
 */
export declare const findTextureMinMax: (image: HDRInput | DataTextureLoaderTexData, mode: "min" | "max", renderer: WebGPURenderer, size?: {
    width: number;
    height: number;
}) => Promise<[number, number, number]>;