content: /*
   * Copyright (C) 2014 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 android.view;
  
  import android.annotation.UnsupportedAppUsage;
  import android.os.Parcel;
  import android.os.Parcelable;
  
  /**
   * This class contains window animation frame statistics. For example, a window
   * animation is usually performed when the application is transitioning from one
   * activity to another. The frame statistics are a snapshot for the time interval
   * from {@link #getStartTimeNano()} to {@link #getEndTimeNano()}.
   * <p>
   * The key idea is that in order to provide a smooth user experience the system should
   * run window animations at a specific time interval obtained by calling {@link
   * #getRefreshPeriodNano()}. If the system does not render a frame every refresh
   * period the user will see irregular window transitions. The time when the frame was
   * actually presented on the display by calling {@link #getFramePresentedTimeNano(int)}.
   */
  public final class WindowAnimationFrameStats extends FrameStats implements Parcelable {
      /**
       * @hide
       */
      public WindowAnimationFrameStats() {
          /* do nothing */
      }
  
      /**
       * Initializes this isntance.
       *
       * @param refreshPeriodNano The display refresh period.
       * @param framesPresentedTimeNano The presented frame times.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public void init(long refreshPeriodNano, long[] framesPresentedTimeNano) {
          mRefreshPeriodNano = refreshPeriodNano;
          mFramesPresentedTimeNano = framesPresentedTimeNano;
      }
  
      private WindowAnimationFrameStats(Parcel parcel) {
          mRefreshPeriodNano = parcel.readLong();
          mFramesPresentedTimeNano = parcel.createLongArray();
      }
  
      @Override
      public int describeContents() {
          return 0;
      }
  
      @Override
      public void writeToParcel(Parcel parcel, int flags) {
          parcel.writeLong(mRefreshPeriodNano);
          parcel.writeLongArray(mFramesPresentedTimeNano);
      }
  
      @Override
      public String toString() {
          StringBuilder builder = new StringBuilder();
          builder.append("WindowAnimationFrameStats[");
          builder.append("frameCount:" + getFrameCount());
          builder.append(", fromTimeNano:" + getStartTimeNano());
          builder.append(", toTimeNano:" + getEndTimeNano());
          builder.append(']');
          return builder.toString();
      }
  
      public static final @android.annotation.NonNull Creator<WindowAnimationFrameStats> CREATOR =
              new Creator<WindowAnimationFrameStats>() {
                  @Override
                  public WindowAnimationFrameStats createFromParcel(Parcel parcel) {
                      return new WindowAnimationFrameStats(parcel);
                  }
  
                  @Override
                  public WindowAnimationFrameStats[] newArray(int size) {
                      return new WindowAnimationFrameStats[size];
                  }
              };
  }
  