| /* |
| * Copyright (C) 2016 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.NonNull; |
| import android.os.Looper; |
| import android.os.MessageQueue; |
| |
| import com.android.internal.util.VirtualRefBasePtr; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * Provides streaming access to frame stats information from the rendering |
| * subsystem to apps. |
| * |
| * @hide |
| */ |
| public class FrameMetricsObserver { |
| private MessageQueue mMessageQueue; |
| |
| private WeakReference<Window> mWindow; |
| |
| private FrameMetrics mFrameMetrics; |
| |
| /* package */ Window.OnFrameMetricsAvailableListener mListener; |
| /* package */ VirtualRefBasePtr mNative; |
| |
| /** |
| * Creates a FrameMetricsObserver |
| * |
| * @param looper the looper to use when invoking callbacks |
| */ |
| FrameMetricsObserver(@NonNull Window window, @NonNull Looper looper, |
| @NonNull Window.OnFrameMetricsAvailableListener listener) { |
| if (looper == null) { |
| throw new NullPointerException("looper cannot be null"); |
| } |
| |
| mMessageQueue = looper.getQueue(); |
| if (mMessageQueue == null) { |
| throw new IllegalStateException("invalid looper, null message queue\n"); |
| } |
| |
| mFrameMetrics = new FrameMetrics(); |
| mWindow = new WeakReference<>(window); |
| mListener = listener; |
| } |
| |
| // Called by native on the provided Handler |
| @SuppressWarnings("unused") |
| private void notifyDataAvailable(int dropCount) { |
| final Window window = mWindow.get(); |
| if (window != null) { |
| mListener.onFrameMetricsAvailable(window, mFrameMetrics, dropCount); |
| } |
| } |
| } |