android-34/com/android/systemui/monet/quantize/PointProvider.java

/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * 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.
 */

package com.android.systemui.monet.quantize;

/** An interface to allow use of different color spaces by quantizers. */
public interface PointProvider {
    /** The three components in the color space of an sRGB color. */
    double[] fromInt(int argb);

    /** The ARGB (i.e. hex code) representation of this color. */
    int toInt(double[] point);

    /**
     * Squared distance between two colors.
     * Distance is defined by scientific color spaces and referred to as delta E.
     */
    double distance(double[] a, double[] b);
}