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 com.android.internal.view;
18 
19 import android.os.RemoteException;
20 import android.view.Surface;
21 import android.view.SurfaceHolder;
22 
23 public class SurfaceCallbackHelper {
24     Runnable mRunnable;
25 
26     int mFinishDrawingCollected = 0;
27     int mFinishDrawingExpected = 0;
28 
29     private Runnable mFinishDrawingRunnable = new Runnable() {
30             @Override
31             public void run() {
32                 synchronized (SurfaceCallbackHelper.this) {
33                     mFinishDrawingCollected++;
34                     if (mFinishDrawingCollected < mFinishDrawingExpected) {
35                         return;
36                     }
37                     mRunnable.run();
38                 }
39             }
40     };
41 
SurfaceCallbackHelper(Runnable callbacksCollected)42     public SurfaceCallbackHelper(Runnable callbacksCollected) {
43         mRunnable = callbacksCollected;
44     }
45 
dispatchSurfaceRedrawNeededAsync(SurfaceHolder holder, SurfaceHolder.Callback callbacks[])46     public void dispatchSurfaceRedrawNeededAsync(SurfaceHolder holder, SurfaceHolder.Callback callbacks[]) {
47         if (callbacks == null || callbacks.length == 0) {
48             mRunnable.run();
49             return;
50         }
51 
52         synchronized (this) {
53             mFinishDrawingExpected = callbacks.length;
54             mFinishDrawingCollected = 0;
55         }
56 
57         for (SurfaceHolder.Callback c : callbacks) {
58             if (c instanceof SurfaceHolder.Callback2) {
59                 ((SurfaceHolder.Callback2) c).surfaceRedrawNeededAsync(
60                         holder, mFinishDrawingRunnable);
61             } else {
62                 mFinishDrawingRunnable.run();
63             }
64         }
65     }
66 }