quantize/PointProvider.java

/*
 * 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.
 */

package com.google.ux.material.libmonet.quantize;

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

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

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