content: /*
   * Copyright (C) 2017 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.launcher3.util;
  
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.graphics.Color;
  import android.graphics.ColorMatrix;
  import android.graphics.drawable.Drawable;
  
  /**
   * Various utility methods associated with theming.
   */
  public class Themes {
  
      public static int getColorAccent(Context context) {
          return getAttrColor(context, android.R.attr.colorAccent);
      }
  
      public static int getAttrColor(Context context, int attr) {
          TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
          int colorAccent = ta.getColor(0, 0);
          ta.recycle();
          return colorAccent;
      }
  
      public static boolean getAttrBoolean(Context context, int attr) {
          TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
          boolean value = ta.getBoolean(0, false);
          ta.recycle();
          return value;
      }
  
      public static Drawable getAttrDrawable(Context context, int attr) {
          TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
          Drawable value = ta.getDrawable(0);
          ta.recycle();
          return value;
      }
  
      /**
       * Returns the alpha corresponding to the theme attribute {@param attr}, in the range [0, 255].
       */
      public static int getAlpha(Context context, int attr) {
          TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
          float alpha = ta.getFloat(0, 0);
          ta.recycle();
          return (int) (255 * alpha + 0.5f);
      }
  
      /**
       * Scales a color matrix such that, when applied to color R G B A, it produces R' G' B' A' where
       * R' = r * R
       * G' = g * G
       * B' = b * B
       * A' = a * A
       *
       * The matrix will, for instance, turn white into r g b a, and black will remain black.
       *
       * @param color The color r g b a
       * @param target The ColorMatrix to scale
       */
      public static void setColorScaleOnMatrix(int color, ColorMatrix target) {
          target.setScale(Color.red(color) / 255f, Color.green(color) / 255f,
                  Color.blue(color) / 255f, Color.alpha(color) / 255f);
      }
  }
  