/**
 * @license
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Functions for blending in HCT and CAM16.
 */
export declare class Blend {
    /**
     * Blend the design color's HCT hue towards the key color's HCT
     * hue, in a way that leaves the original color recognizable and
     * recognizably shifted towards the key color.
     *
     * @param designColor ARGB representation of an arbitrary color.
     * @param sourceColor ARGB representation of the main theme color.
     * @return The design color with a hue shifted towards the
     * system's color, a slightly warmer/cooler variant of the design
     * color's hue.
     */
    static harmonize(designColor: number, sourceColor: number): number;
    /**
     * Blends hue from one color into another. The chroma and tone of
     * the original color are maintained.
     *
     * @param from ARGB representation of color
     * @param to ARGB representation of color
     * @param amount how much blending to perform; 0.0 >= and <= 1.0
     * @return from, with a hue blended towards to. Chroma and tone
     * are constant.
     */
    static hctHue(from: number, to: number, amount: number): number;
    /**
     * Blend in CAM16-UCS space.
     *
     * @param from ARGB representation of color
     * @param to ARGB representation of color
     * @param amount how much blending to perform; 0.0 >= and <= 1.0
     * @return from, blended towards to. Hue, chroma, and tone will
     * change.
     */
    static cam16Ucs(from: number, to: number, amount: number): number;
}