import type { Color, ReadonlyColor } from "./api.js";
/**
 * Multiplies RGB channels w/ alpha channel. Assumes alpha is in last vector
 * component and `[0,1]` interval. Does NOT clamp result.
 *
 * @param out -
 * @param src -
 */
export declare const premultiply: (out: Color | null, src: ReadonlyColor) => Color;
/**
 * Multiplies RGB channels of packed int with alpha channel. Assumes
 * 8bits/channel and alpha in MSB lane.
 *
 * @param src -
 */
export declare const premultiplyInt: (src: number) => number;
/**
 * Reverse operation of {@link premultiply}. Divides RGB channels by alpha,
 * unless alpha is zero. Does NOT clamp result.
 *
 * @param out -
 * @param src -
 */
export declare const postmultiply: (out: Color | null, src: ReadonlyColor) => Color;
/**
 * Reverse op of {@link premultiplyInt}. Assumes 8bits/channel and alpha in MSB
 * lane. Divides RGB channels by alpha (unless zero) and DOES clamp result to
 * avoid overflows.
 *
 * @param src -
 */
export declare const postmultiplyInt: (src: number) => number;
/**
 * Returns true if RGBA float color vector is premultiplied.
 *
 * @param src -
 */
export declare const isPremultiplied: (src: ReadonlyColor) => boolean;
/**
 * Returns true if packed int color value is premultiplied.
 *
 * @param src -
 */
export declare const isPremultipliedInt: (src: number) => boolean;
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