content: /*
   * 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 com.android.internal.view;
  
  import android.os.RemoteException;
  import android.view.Surface;
  import android.view.SurfaceHolder;
  
  public class SurfaceCallbackHelper {
      Runnable mRunnable;
  
      int mFinishDrawingCollected = 0;
      int mFinishDrawingExpected = 0;
  
      private Runnable mFinishDrawingRunnable = new Runnable() {
              @Override
              public void run() {
                  synchronized (SurfaceCallbackHelper.this) {
                      mFinishDrawingCollected++;
                      if (mFinishDrawingCollected < mFinishDrawingExpected) {
                          return;
                      }
                      mRunnable.run();
                  }
              }
      };
  
      public SurfaceCallbackHelper(Runnable callbacksCollected) {
          mRunnable = callbacksCollected;
      }
  
      public void dispatchSurfaceRedrawNeededAsync(SurfaceHolder holder, SurfaceHolder.Callback callbacks[]) {
          if (callbacks == null || callbacks.length == 0) {
              mRunnable.run();
              return;
          }
  
          synchronized (this) {
              mFinishDrawingExpected = callbacks.length;
              mFinishDrawingCollected = 0;
          }
  
          for (SurfaceHolder.Callback c : callbacks) {
              if (c instanceof SurfaceHolder.Callback2) {
                  ((SurfaceHolder.Callback2) c).surfaceRedrawNeededAsync(
                          holder, mFinishDrawingRunnable);
              } else {
                  mFinishDrawingRunnable.run();
              }
          }
      }
  }