material-components_material-components-android/lib/java/com/google/android/material/drawable/DrawableUtils.java

/*
 * Copyright 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
 *
 *     https://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.android.material.drawable;

import android.content.res.ColorStateList;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffColorFilter;
import android.graphics.drawable.Drawable;
import androidx.annotation.Nullable;
import androidx.annotation.RestrictTo;
import androidx.annotation.RestrictTo.Scope;

/** Utils class for Drawables. */
@RestrictTo(Scope.LIBRARY_GROUP)
public class DrawableUtils {

  private DrawableUtils() {}

  /** Returns a tint filter for the given tint and mode. */
  @Nullable
  public static PorterDuffColorFilter updateTintFilter(
      Drawable drawable, @Nullable ColorStateList tint, @Nullable PorterDuff.Mode tintMode) {
    if (tint == null || tintMode == null) {
      return null;
    }

    final int color = tint.getColorForState(drawable.getState(), Color.TRANSPARENT);
    return new PorterDuffColorFilter(color, tintMode);
  }
}