1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package android.view;
18 
19 import android.annotation.NonNull;
20 import android.graphics.HardwareRendererObserver;
21 import android.os.Handler;
22 
23 import java.lang.ref.WeakReference;
24 
25 /**
26  * Provides streaming access to frame stats information from the rendering
27  * subsystem to apps.
28  *
29  * @hide
30  */
31 public class FrameMetricsObserver
32         implements HardwareRendererObserver.OnFrameMetricsAvailableListener {
33     private final WeakReference<Window> mWindow;
34     private final FrameMetrics mFrameMetrics;
35     private final HardwareRendererObserver mObserver;
36     /*package*/ final Window.OnFrameMetricsAvailableListener mListener;
37 
38     /**
39      * Creates a FrameMetricsObserver
40      *
41      * @param handler the Handler to use when invoking callbacks
42      */
FrameMetricsObserver(@onNull Window window, @NonNull Handler handler, @NonNull Window.OnFrameMetricsAvailableListener listener)43     FrameMetricsObserver(@NonNull Window window, @NonNull Handler handler,
44             @NonNull Window.OnFrameMetricsAvailableListener listener) {
45         mWindow = new WeakReference<>(window);
46         mListener = listener;
47         mFrameMetrics = new FrameMetrics();
48         mObserver = new HardwareRendererObserver(this,  mFrameMetrics.mTimingData, handler,
49                 false /*waitForPresentTime*/);
50     }
51 
52     /**
53      * Implementation of OnFrameMetricsAvailableListener
54      * @param dropCountSinceLastInvocation the number of reports dropped since the last time
55      * @Override
56      */
onFrameMetricsAvailable(int dropCountSinceLastInvocation)57     public void onFrameMetricsAvailable(int dropCountSinceLastInvocation) {
58         if (mWindow.get() != null) {
59             mListener.onFrameMetricsAvailable(mWindow.get(), mFrameMetrics,
60                     dropCountSinceLastInvocation);
61         }
62     }
63 
getRendererObserver()64     /*package*/ HardwareRendererObserver getRendererObserver() {
65         return mObserver;
66     }
67 }
68