content: /*
   * 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.
   */
  
  // This file is automatically generated. Do not modify it.
  
  package com.google.material.color.blend;
  
  import com.google.material.color.hct.Cam16;
  import com.google.material.color.hct.Hct;
  import com.google.material.color.utils.ColorUtils;
  import com.google.material.color.utils.MathUtils;
  
  /**
   * Functions for blending in HCT and CAM16.
   */
  public class Blend {
    private 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.
     */
    public static int harmonize(int designColor, int sourceColor) {
      Hct fromHct = Hct.fromInt(designColor);
      Hct toHct = Hct.fromInt(sourceColor);
      double differenceDegrees = MathUtils.differenceDegrees(fromHct.getHue(), toHct.getHue());
      double rotationDegrees = Math.min(differenceDegrees * 0.5, 15.0);
      double outputHue =
              MathUtils.sanitizeDegreesDouble(
                      fromHct.getHue()
                              + rotationDegrees * MathUtils.rotationDirection(fromHct.getHue(), toHct.getHue()));
      return Hct.from(outputHue, fromHct.getChroma(), fromHct.getTone()).toInt();
    }
  
    /**
     * 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.
     */
    public static int hctHue(int from, int to, double amount) {
      int ucs = cam16Ucs(from, to, amount);
      Cam16 ucsCam = Cam16.fromInt(ucs);
      Cam16 fromCam = Cam16.fromInt(from);
      Hct blended = Hct.from(ucsCam.getHue(), fromCam.getChroma(), ColorUtils.lstarFromArgb(from));
      return blended.toInt();
    }
  
    /**
     * 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.
     */
    public static int cam16Ucs(int from, int to, double amount) {
      Cam16 fromCam = Cam16.fromInt(from);
      Cam16 toCam = Cam16.fromInt(to);
      double fromJ = fromCam.getJstar();
      double fromA = fromCam.getAstar();
      double fromB = fromCam.getBstar();
      double toJ = toCam.getJstar();
      double toA = toCam.getAstar();
      double toB = toCam.getBstar();
      double jstar = fromJ + (toJ - fromJ) * amount;
      double astar = fromA + (toA - fromA) * amount;
      double bstar = fromB + (toB - fromB) * amount;
      return Cam16.fromUcs(jstar, astar, bstar).toInt();
    }
  }
  
  