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      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 
     42     public SurfaceCallbackHelper(Runnable callbacksCollected) {
     43         mRunnable = callbacksCollected;
     44     }
     45 
     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 }