services/core/java/com/android/server/wm/RemoteAnimationController.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2018 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.server.wm;

 import static com.android.server.wm.AnimationAdapterProto.REMOTE;
 import static com.android.server.wm.RemoteAnimationAdapterWrapperProto.TARGET;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_APP_TRANSITIONS;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_REMOTE_ANIMATIONS;
 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;

 import android.graphics.Point;
 import android.graphics.Rect;
 import android.os.Binder;
 import android.os.Handler;
 import android.os.IBinder.DeathRecipient;
 import android.os.RemoteException;
 import android.os.SystemClock;
 import android.util.Slog;
 import android.util.proto.ProtoOutputStream;
 import android.view.IRemoteAnimationFinishedCallback;
 import android.view.RemoteAnimationAdapter;
 import android.view.RemoteAnimationTarget;
 import android.view.SurfaceControl;
 import android.view.SurfaceControl.Transaction;

 import com.android.internal.util.FastPrintWriter;
 import com.android.server.wm.SurfaceAnimator.OnAnimationFinishedCallback;
 import com.android.server.wm.utils.InsetUtils;

 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.ArrayList;

 /**
  * Helper class to run app animations in a remote process.
  */
 class RemoteAnimationController implements DeathRecipient {
     private static final String TAG = TAG_WITH_CLASS_NAME
             || (DEBUG_REMOTE_ANIMATIONS && !DEBUG_APP_TRANSITIONS)
                     ? "RemoteAnimationController" : TAG_WM;
     private static final long TIMEOUT_MS = 2000;

     private final WindowManagerService mService;
     private final RemoteAnimationAdapter mRemoteAnimationAdapter;
     private final ArrayList<RemoteAnimationRecord> mPendingAnimations = new ArrayList<>();
     private final Rect mTmpRect = new Rect();
     private final Handler mHandler;
     private final Runnable mTimeoutRunnable = () -> cancelAnimation("timeoutRunnable");

     private FinishedCallback mFinishedCallback;
     private boolean mCanceled;
     private boolean mLinkedToDeathOfRunner;

     RemoteAnimationController(WindowManagerService service,
             RemoteAnimationAdapter remoteAnimationAdapter, Handler handler) {
         mService = service;
         mRemoteAnimationAdapter = remoteAnimationAdapter;
         mHandler = handler;
     }

     /**
      * Creates an animation record for each individual {@link AppWindowToken}.
      *
      * @param appWindowToken The app to animate.
      * @param position The position app bounds, in screen coordinates.
      * @param stackBounds The stack bounds of the app relative to position.
      * @param startBounds The stack bounds before the transition, in screen coordinates
      * @return The record representing animation(s) to run on the app.
      */
     RemoteAnimationRecord createRemoteAnimationRecord(AppWindowToken appWindowToken,
             Point position, Rect stackBounds, Rect startBounds) {
         if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "createAnimationAdapter(): token="
                 + appWindowToken);
         final RemoteAnimationRecord adapters =
                 new RemoteAnimationRecord(appWindowToken, position, stackBounds, startBounds);
         mPendingAnimations.add(adapters);
         return adapters;
     }

     /**
      * Called when the transition is ready to be started, and all leashes have been set up.
      */
     void goodToGo() {
         if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "goodToGo()");
         if (mPendingAnimations.isEmpty() || mCanceled) {
             if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "goodToGo(): Animation finished already,"
                     + " canceled=" + mCanceled
                     + " mPendingAnimations=" + mPendingAnimations.size());
             onAnimationFinished();
             return;
         }

         // Scale the timeout with the animator scale the controlling app is using.
         mHandler.postDelayed(mTimeoutRunnable,
                 (long) (TIMEOUT_MS * mService.getCurrentAnimatorScale()));
         mFinishedCallback = new FinishedCallback(this);

         final RemoteAnimationTarget[] animations = createAnimations();
         if (animations.length == 0) {
             if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "goodToGo(): No apps to animate");
             onAnimationFinished();
             return;
         }
         mService.mAnimator.addAfterPrepareSurfacesRunnable(() -> {
             try {
                 linkToDeathOfRunner();
                 mRemoteAnimationAdapter.getRunner().onAnimationStart(animations, mFinishedCallback);
             } catch (RemoteException e) {
                 Slog.e(TAG, "Failed to start remote animation", e);
                 onAnimationFinished();
             }
             if (DEBUG_REMOTE_ANIMATIONS) {
                 Slog.d(TAG, "startAnimation(): Notify animation start:");
                 writeStartDebugStatement();
             }
         });
         sendRunningRemoteAnimation(true);
     }

     void cancelAnimation(String reason) {
         if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "cancelAnimation(): reason=" + reason);
         synchronized (mService.getWindowManagerLock()) {
             if (mCanceled) {
                 return;
             }
             mCanceled = true;
         }
         onAnimationFinished();
         invokeAnimationCancelled();
     }

     private void writeStartDebugStatement() {
         Slog.i(TAG, "Starting remote animation");
         final StringWriter sw = new StringWriter();
         final FastPrintWriter pw = new FastPrintWriter(sw);
         for (int i = mPendingAnimations.size() - 1; i >= 0; i--) {
             mPendingAnimations.get(i).mAdapter.dump(pw, "");
         }
         pw.close();
         Slog.i(TAG, sw.toString());
     }

     private RemoteAnimationTarget[] createAnimations() {
         if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "createAnimations()");
         final ArrayList<RemoteAnimationTarget> targets = new ArrayList<>();
         for (int i = mPendingAnimations.size() - 1; i >= 0; i--) {
             final RemoteAnimationRecord wrappers = mPendingAnimations.get(i);
             final RemoteAnimationTarget target = wrappers.createRemoteAnimationTarget();
             if (target != null) {
                 if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "\tAdd token=" + wrappers.mAppWindowToken);
                 targets.add(target);
             } else {
                 if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "\tRemove token="
                         + wrappers.mAppWindowToken);

                 // We can't really start an animation but we still need to make sure to finish the
                 // pending animation that was started by SurfaceAnimator
                 if (wrappers.mAdapter != null
                         && wrappers.mAdapter.mCapturedFinishCallback != null) {
                     wrappers.mAdapter.mCapturedFinishCallback
                             .onAnimationFinished(wrappers.mAdapter);
                 }
                 if (wrappers.mThumbnailAdapter != null
                         && wrappers.mThumbnailAdapter.mCapturedFinishCallback != null) {
                     wrappers.mThumbnailAdapter.mCapturedFinishCallback
                             .onAnimationFinished(wrappers.mThumbnailAdapter);
                 }
                 mPendingAnimations.remove(i);
             }
         }
         return targets.toArray(new RemoteAnimationTarget[targets.size()]);
     }

     private void onAnimationFinished() {
         if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "onAnimationFinished(): mPendingAnimations="
                 + mPendingAnimations.size());
         mHandler.removeCallbacks(mTimeoutRunnable);
         synchronized (mService.mGlobalLock) {
             unlinkToDeathOfRunner();
             releaseFinishedCallback();
             mService.openSurfaceTransaction();
             try {
                 if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG,
                         "onAnimationFinished(): Notify animation finished:");
                 for (int i = mPendingAnimations.size() - 1; i >= 0; i--) {
                     final RemoteAnimationRecord adapters = mPendingAnimations.get(i);
                     if (adapters.mAdapter != null) {
                         adapters.mAdapter.mCapturedFinishCallback
                                 .onAnimationFinished(adapters.mAdapter);
                     }
                     if (adapters.mThumbnailAdapter != null) {
                         adapters.mThumbnailAdapter.mCapturedFinishCallback
                                 .onAnimationFinished(adapters.mThumbnailAdapter);
                     }
                     if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "\t" + adapters.mAppWindowToken);
                 }
             } catch (Exception e) {
                 Slog.e(TAG, "Failed to finish remote animation", e);
                 throw e;
             } finally {
                 mService.closeSurfaceTransaction("RemoteAnimationController#finished");
             }
         }
         sendRunningRemoteAnimation(false);
         if (DEBUG_REMOTE_ANIMATIONS) Slog.i(TAG, "Finishing remote animation");
     }

     private void invokeAnimationCancelled() {
         try {
             mRemoteAnimationAdapter.getRunner().onAnimationCancelled();
         } catch (RemoteException e) {
             Slog.e(TAG, "Failed to notify cancel", e);
         }
     }

     private void releaseFinishedCallback() {
         if (mFinishedCallback != null) {
             mFinishedCallback.release();
             mFinishedCallback = null;
         }
     }

     private void sendRunningRemoteAnimation(boolean running) {
         final int pid = mRemoteAnimationAdapter.getCallingPid();
         if (pid == 0) {
             throw new RuntimeException("Calling pid of remote animation was null");
         }
         mService.sendSetRunningRemoteAnimation(pid, running);
     }

     private void linkToDeathOfRunner() throws RemoteException {
         if (!mLinkedToDeathOfRunner) {
             mRemoteAnimationAdapter.getRunner().asBinder().linkToDeath(this, 0);
             mLinkedToDeathOfRunner = true;
         }
     }

     private void unlinkToDeathOfRunner() {
         if (mLinkedToDeathOfRunner) {
             mRemoteAnimationAdapter.getRunner().asBinder().unlinkToDeath(this, 0);
             mLinkedToDeathOfRunner = false;
         }
     }

     @Override
     public void binderDied() {
         cancelAnimation("binderDied");
     }

     private static final class FinishedCallback extends IRemoteAnimationFinishedCallback.Stub {

         RemoteAnimationController mOuter;

         FinishedCallback(RemoteAnimationController outer) {
             mOuter = outer;
         }

         @Override
         public void onAnimationFinished() throws RemoteException {
             if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "app-onAnimationFinished(): mOuter=" + mOuter);
             final long token = Binder.clearCallingIdentity();
             try {
                 if (mOuter != null) {
                     mOuter.onAnimationFinished();

                     // In case the client holds on to the finish callback, make sure we don't leak
                     // RemoteAnimationController which in turn would leak the runner on the client.
                     mOuter = null;
                 }
             } finally {
                 Binder.restoreCallingIdentity(token);
             }
         }

         /**
          * Marks this callback as not be used anymore by releasing the reference to the outer class
          * to prevent memory leak.
          */
         void release() {
             if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "app-release(): mOuter=" + mOuter);
             mOuter = null;
         }
     };

     /**
      * Contains information about a remote-animation for one AppWindowToken. This keeps track of,
      * potentially, multiple animating surfaces (AdapterWrappers) associated with one
      * Window/Transition. For example, a change transition has an adapter controller for the
      * main window and an adapter controlling the start-state snapshot.
      * <p>
      * This can be thought of as a bridge between the information that the remote animator sees (via
      * {@link RemoteAnimationTarget}) and what the server sees (the
      * {@link RemoteAnimationAdapterWrapper}(s) interfacing with the moving surfaces).
      */
     public class RemoteAnimationRecord {
         RemoteAnimationAdapterWrapper mAdapter;
         RemoteAnimationAdapterWrapper mThumbnailAdapter = null;
         RemoteAnimationTarget mTarget;
         final AppWindowToken mAppWindowToken;
         final Rect mStartBounds;

         RemoteAnimationRecord(AppWindowToken appWindowToken, Point endPos, Rect endBounds,
                 Rect startBounds) {
             mAppWindowToken = appWindowToken;
             mAdapter = new RemoteAnimationAdapterWrapper(this, endPos, endBounds);
             if (startBounds != null) {
                 mStartBounds = new Rect(startBounds);
                 mTmpRect.set(startBounds);
                 mTmpRect.offsetTo(0, 0);
                 if (mRemoteAnimationAdapter.getChangeNeedsSnapshot()) {
                     mThumbnailAdapter =
                             new RemoteAnimationAdapterWrapper(this, new Point(0, 0), mTmpRect);
                 }
             } else {
                 mStartBounds = null;
             }
         }

         RemoteAnimationTarget createRemoteAnimationTarget() {
             final Task task = mAppWindowToken.getTask();
             final WindowState mainWindow = mAppWindowToken.findMainWindow();
             if (task == null || mainWindow == null || mAdapter == null
                     || mAdapter.mCapturedFinishCallback == null
                     || mAdapter.mCapturedLeash == null) {
                 return null;
             }
             final Rect insets = new Rect();
             mainWindow.getContentInsets(insets);
             InsetUtils.addInsets(insets, mAppWindowToken.getLetterboxInsets());
             mTarget = new RemoteAnimationTarget(task.mTaskId, getMode(),
                     mAdapter.mCapturedLeash, !mAppWindowToken.fillsParent(),
                     mainWindow.mWinAnimator.mLastClipRect, insets,
                     mAppWindowToken.getPrefixOrderIndex(), mAdapter.mPosition,
                     mAdapter.mStackBounds, task.getWindowConfiguration(), false /*isNotInRecents*/,
                     mThumbnailAdapter != null ? mThumbnailAdapter.mCapturedLeash : null,
                     mStartBounds);
             return mTarget;
         }

         private int getMode() {
             final DisplayContent dc = mAppWindowToken.getDisplayContent();
             if (dc.mOpeningApps.contains(mAppWindowToken)) {
                 return RemoteAnimationTarget.MODE_OPENING;
             } else if (dc.mChangingApps.contains(mAppWindowToken)) {
                 return RemoteAnimationTarget.MODE_CHANGING;
             } else {
                 return RemoteAnimationTarget.MODE_CLOSING;
             }
         }
     }

     private class RemoteAnimationAdapterWrapper implements AnimationAdapter {
         private final RemoteAnimationRecord mRecord;
         SurfaceControl mCapturedLeash;
         private OnAnimationFinishedCallback mCapturedFinishCallback;
         private final Point mPosition = new Point();
         private final Rect mStackBounds = new Rect();

         RemoteAnimationAdapterWrapper(RemoteAnimationRecord record, Point position,
                 Rect stackBounds) {
             mRecord = record;
             mPosition.set(position.x, position.y);
             mStackBounds.set(stackBounds);
         }

         @Override
         public boolean getShowWallpaper() {
             return false;
         }

         @Override
         public int getBackgroundColor() {
             return 0;
         }

         @Override
         public void startAnimation(SurfaceControl animationLeash, Transaction t,
                 OnAnimationFinishedCallback finishCallback) {
             if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "startAnimation");

             // Restore z-layering, position and stack crop until client has a chance to modify it.
             t.setLayer(animationLeash, mRecord.mAppWindowToken.getPrefixOrderIndex());
             t.setPosition(animationLeash, mPosition.x, mPosition.y);
             mTmpRect.set(mStackBounds);
             mTmpRect.offsetTo(0, 0);
             t.setWindowCrop(animationLeash, mTmpRect);
             mCapturedLeash = animationLeash;
             mCapturedFinishCallback = finishCallback;
         }

         @Override
         public void onAnimationCancelled(SurfaceControl animationLeash) {
             if (mRecord.mAdapter == this) {
                 mRecord.mAdapter = null;
             } else {
                 mRecord.mThumbnailAdapter = null;
             }
             if (mRecord.mAdapter == null && mRecord.mThumbnailAdapter == null) {
                 mPendingAnimations.remove(mRecord);
             }
             if (mPendingAnimations.isEmpty()) {
                 mHandler.removeCallbacks(mTimeoutRunnable);
                 releaseFinishedCallback();
                 invokeAnimationCancelled();
                 sendRunningRemoteAnimation(false);
             }
         }

         @Override
         public long getDurationHint() {
             return mRemoteAnimationAdapter.getDuration();
         }

         @Override
         public long getStatusBarTransitionsStartTime() {
             return SystemClock.uptimeMillis()
                     + mRemoteAnimationAdapter.getStatusBarTransitionDelay();
         }

         @Override
         public void dump(PrintWriter pw, String prefix) {
             pw.print(prefix); pw.print("token="); pw.println(mRecord.mAppWindowToken);
             if (mRecord.mTarget != null) {
                 pw.print(prefix); pw.println("Target:");
                 mRecord.mTarget.dump(pw, prefix + "  ");
             } else {
                 pw.print(prefix); pw.println("Target: null");
             }
         }

         @Override
         public void writeToProto(ProtoOutputStream proto) {
             final long token = proto.start(REMOTE);
             if (mRecord.mTarget != null) {
                 mRecord.mTarget.writeToProto(proto, TARGET);
             }
             proto.end(token);
         }
     }
 }
	/*
	* Copyright (C) 2018 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.server.wm;

	import static com.android.server.wm.AnimationAdapterProto.REMOTE;
	import static com.android.server.wm.RemoteAnimationAdapterWrapperProto.TARGET;
	import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_APP_TRANSITIONS;
	import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_REMOTE_ANIMATIONS;
	import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
	import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;

	import android.graphics.Point;
	import android.graphics.Rect;
	import android.os.Binder;
	import android.os.Handler;
	import android.os.IBinder.DeathRecipient;
	import android.os.RemoteException;
	import android.os.SystemClock;
	import android.util.Slog;
	import android.util.proto.ProtoOutputStream;
	import android.view.IRemoteAnimationFinishedCallback;
	import android.view.RemoteAnimationAdapter;
	import android.view.RemoteAnimationTarget;
	import android.view.SurfaceControl;
	import android.view.SurfaceControl.Transaction;

	import com.android.internal.util.FastPrintWriter;
	import com.android.server.wm.SurfaceAnimator.OnAnimationFinishedCallback;
	import com.android.server.wm.utils.InsetUtils;

	import java.io.PrintWriter;
	import java.io.StringWriter;
	import java.util.ArrayList;

	/**
	* Helper class to run app animations in a remote process.
	*/
	class RemoteAnimationController implements DeathRecipient {
	private static final String TAG = TAG_WITH_CLASS_NAME
	\|\| (DEBUG_REMOTE_ANIMATIONS && !DEBUG_APP_TRANSITIONS)
	? "RemoteAnimationController" : TAG_WM;
	private static final long TIMEOUT_MS = 2000;

	private final WindowManagerService mService;
	private final RemoteAnimationAdapter mRemoteAnimationAdapter;
	private final ArrayList<RemoteAnimationRecord> mPendingAnimations = new ArrayList<>();
	private final Rect mTmpRect = new Rect();
	private final Handler mHandler;
	private final Runnable mTimeoutRunnable = () -> cancelAnimation("timeoutRunnable");

	private FinishedCallback mFinishedCallback;
	private boolean mCanceled;
	private boolean mLinkedToDeathOfRunner;

	RemoteAnimationController(WindowManagerService service,
	RemoteAnimationAdapter remoteAnimationAdapter, Handler handler) {
	mService = service;
	mRemoteAnimationAdapter = remoteAnimationAdapter;
	mHandler = handler;
	}

	/**
	* Creates an animation record for each individual {@link AppWindowToken}.
	*
	* @param appWindowToken The app to animate.
	* @param position The position app bounds, in screen coordinates.
	* @param stackBounds The stack bounds of the app relative to position.
	* @param startBounds The stack bounds before the transition, in screen coordinates
	* @return The record representing animation(s) to run on the app.
	*/
	RemoteAnimationRecord createRemoteAnimationRecord(AppWindowToken appWindowToken,
	Point position, Rect stackBounds, Rect startBounds) {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "createAnimationAdapter(): token="
	+ appWindowToken);
	final RemoteAnimationRecord adapters =
	new RemoteAnimationRecord(appWindowToken, position, stackBounds, startBounds);
	mPendingAnimations.add(adapters);
	return adapters;
	}

	/**
	* Called when the transition is ready to be started, and all leashes have been set up.
	*/
	void goodToGo() {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "goodToGo()");
	if (mPendingAnimations.isEmpty() \|\| mCanceled) {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "goodToGo(): Animation finished already,"
	+ " canceled=" + mCanceled
	+ " mPendingAnimations=" + mPendingAnimations.size());
	onAnimationFinished();
	return;
	}

	// Scale the timeout with the animator scale the controlling app is using.
	mHandler.postDelayed(mTimeoutRunnable,
	(long) (TIMEOUT_MS * mService.getCurrentAnimatorScale()));
	mFinishedCallback = new FinishedCallback(this);

	final RemoteAnimationTarget[] animations = createAnimations();
	if (animations.length == 0) {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "goodToGo(): No apps to animate");
	onAnimationFinished();
	return;
	}
	mService.mAnimator.addAfterPrepareSurfacesRunnable(() -> {
	try {
	linkToDeathOfRunner();
	mRemoteAnimationAdapter.getRunner().onAnimationStart(animations, mFinishedCallback);
	} catch (RemoteException e) {
	Slog.e(TAG, "Failed to start remote animation", e);
	onAnimationFinished();
	}
	if (DEBUG_REMOTE_ANIMATIONS) {
	Slog.d(TAG, "startAnimation(): Notify animation start:");
	writeStartDebugStatement();
	}
	});
	sendRunningRemoteAnimation(true);
	}

	void cancelAnimation(String reason) {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "cancelAnimation(): reason=" + reason);
	synchronized (mService.getWindowManagerLock()) {
	if (mCanceled) {
	return;
	}
	mCanceled = true;
	}
	onAnimationFinished();
	invokeAnimationCancelled();
	}

	private void writeStartDebugStatement() {
	Slog.i(TAG, "Starting remote animation");
	final StringWriter sw = new StringWriter();
	final FastPrintWriter pw = new FastPrintWriter(sw);
	for (int i = mPendingAnimations.size() - 1; i >= 0; i--) {
	mPendingAnimations.get(i).mAdapter.dump(pw, "");
	}
	pw.close();
	Slog.i(TAG, sw.toString());
	}

	private RemoteAnimationTarget[] createAnimations() {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "createAnimations()");
	final ArrayList<RemoteAnimationTarget> targets = new ArrayList<>();
	for (int i = mPendingAnimations.size() - 1; i >= 0; i--) {
	final RemoteAnimationRecord wrappers = mPendingAnimations.get(i);
	final RemoteAnimationTarget target = wrappers.createRemoteAnimationTarget();
	if (target != null) {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "\tAdd token=" + wrappers.mAppWindowToken);
	targets.add(target);
	} else {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "\tRemove token="
	+ wrappers.mAppWindowToken);

	// We can't really start an animation but we still need to make sure to finish the
	// pending animation that was started by SurfaceAnimator
	if (wrappers.mAdapter != null
	&& wrappers.mAdapter.mCapturedFinishCallback != null) {
	wrappers.mAdapter.mCapturedFinishCallback
	.onAnimationFinished(wrappers.mAdapter);
	}
	if (wrappers.mThumbnailAdapter != null
	&& wrappers.mThumbnailAdapter.mCapturedFinishCallback != null) {
	wrappers.mThumbnailAdapter.mCapturedFinishCallback
	.onAnimationFinished(wrappers.mThumbnailAdapter);
	}
	mPendingAnimations.remove(i);
	}
	}
	return targets.toArray(new RemoteAnimationTarget[targets.size()]);
	}

	private void onAnimationFinished() {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "onAnimationFinished(): mPendingAnimations="
	+ mPendingAnimations.size());
	mHandler.removeCallbacks(mTimeoutRunnable);
	synchronized (mService.mGlobalLock) {
	unlinkToDeathOfRunner();
	releaseFinishedCallback();
	mService.openSurfaceTransaction();
	try {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG,
	"onAnimationFinished(): Notify animation finished:");
	for (int i = mPendingAnimations.size() - 1; i >= 0; i--) {
	final RemoteAnimationRecord adapters = mPendingAnimations.get(i);
	if (adapters.mAdapter != null) {
	adapters.mAdapter.mCapturedFinishCallback
	.onAnimationFinished(adapters.mAdapter);
	}
	if (adapters.mThumbnailAdapter != null) {
	adapters.mThumbnailAdapter.mCapturedFinishCallback
	.onAnimationFinished(adapters.mThumbnailAdapter);
	}
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "\t" + adapters.mAppWindowToken);
	}
	} catch (Exception e) {
	Slog.e(TAG, "Failed to finish remote animation", e);
	throw e;
	} finally {
	mService.closeSurfaceTransaction("RemoteAnimationController#finished");
	}
	}
	sendRunningRemoteAnimation(false);
	if (DEBUG_REMOTE_ANIMATIONS) Slog.i(TAG, "Finishing remote animation");
	}

	private void invokeAnimationCancelled() {
	try {
	mRemoteAnimationAdapter.getRunner().onAnimationCancelled();
	} catch (RemoteException e) {
	Slog.e(TAG, "Failed to notify cancel", e);
	}
	}

	private void releaseFinishedCallback() {
	if (mFinishedCallback != null) {
	mFinishedCallback.release();
	mFinishedCallback = null;
	}
	}

	private void sendRunningRemoteAnimation(boolean running) {
	final int pid = mRemoteAnimationAdapter.getCallingPid();
	if (pid == 0) {
	throw new RuntimeException("Calling pid of remote animation was null");
	}
	mService.sendSetRunningRemoteAnimation(pid, running);
	}

	private void linkToDeathOfRunner() throws RemoteException {
	if (!mLinkedToDeathOfRunner) {
	mRemoteAnimationAdapter.getRunner().asBinder().linkToDeath(this, 0);
	mLinkedToDeathOfRunner = true;
	}
	}

	private void unlinkToDeathOfRunner() {
	if (mLinkedToDeathOfRunner) {
	mRemoteAnimationAdapter.getRunner().asBinder().unlinkToDeath(this, 0);
	mLinkedToDeathOfRunner = false;
	}
	}

	@Override
	public void binderDied() {
	cancelAnimation("binderDied");
	}

	private static final class FinishedCallback extends IRemoteAnimationFinishedCallback.Stub {

	RemoteAnimationController mOuter;

	FinishedCallback(RemoteAnimationController outer) {
	mOuter = outer;
	}

	@Override
	public void onAnimationFinished() throws RemoteException {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "app-onAnimationFinished(): mOuter=" + mOuter);
	final long token = Binder.clearCallingIdentity();
	try {
	if (mOuter != null) {
	mOuter.onAnimationFinished();

	// In case the client holds on to the finish callback, make sure we don't leak
	// RemoteAnimationController which in turn would leak the runner on the client.
	mOuter = null;
	}
	} finally {
	Binder.restoreCallingIdentity(token);
	}
	}

	/**
	* Marks this callback as not be used anymore by releasing the reference to the outer class
	* to prevent memory leak.
	*/
	void release() {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "app-release(): mOuter=" + mOuter);
	mOuter = null;
	}
	};

	/**
	* Contains information about a remote-animation for one AppWindowToken. This keeps track of,
	* potentially, multiple animating surfaces (AdapterWrappers) associated with one
	* Window/Transition. For example, a change transition has an adapter controller for the
	* main window and an adapter controlling the start-state snapshot.
	* <p>
	* This can be thought of as a bridge between the information that the remote animator sees (via
	* {@link RemoteAnimationTarget}) and what the server sees (the
	* {@link RemoteAnimationAdapterWrapper}(s) interfacing with the moving surfaces).
	*/
	public class RemoteAnimationRecord {
	RemoteAnimationAdapterWrapper mAdapter;
	RemoteAnimationAdapterWrapper mThumbnailAdapter = null;
	RemoteAnimationTarget mTarget;
	final AppWindowToken mAppWindowToken;
	final Rect mStartBounds;

	RemoteAnimationRecord(AppWindowToken appWindowToken, Point endPos, Rect endBounds,
	Rect startBounds) {
	mAppWindowToken = appWindowToken;
	mAdapter = new RemoteAnimationAdapterWrapper(this, endPos, endBounds);
	if (startBounds != null) {
	mStartBounds = new Rect(startBounds);
	mTmpRect.set(startBounds);
	mTmpRect.offsetTo(0, 0);
	if (mRemoteAnimationAdapter.getChangeNeedsSnapshot()) {
	mThumbnailAdapter =
	new RemoteAnimationAdapterWrapper(this, new Point(0, 0), mTmpRect);
	}
	} else {
	mStartBounds = null;
	}
	}

	RemoteAnimationTarget createRemoteAnimationTarget() {
	final Task task = mAppWindowToken.getTask();
	final WindowState mainWindow = mAppWindowToken.findMainWindow();
	if (task == null \|\| mainWindow == null \|\| mAdapter == null
	\|\| mAdapter.mCapturedFinishCallback == null
	\|\| mAdapter.mCapturedLeash == null) {
	return null;
	}
	final Rect insets = new Rect();
	mainWindow.getContentInsets(insets);
	InsetUtils.addInsets(insets, mAppWindowToken.getLetterboxInsets());
	mTarget = new RemoteAnimationTarget(task.mTaskId, getMode(),
	mAdapter.mCapturedLeash, !mAppWindowToken.fillsParent(),
	mainWindow.mWinAnimator.mLastClipRect, insets,
	mAppWindowToken.getPrefixOrderIndex(), mAdapter.mPosition,
	mAdapter.mStackBounds, task.getWindowConfiguration(), false /isNotInRecents/,
	mThumbnailAdapter != null ? mThumbnailAdapter.mCapturedLeash : null,
	mStartBounds);
	return mTarget;
	}

	private int getMode() {
	final DisplayContent dc = mAppWindowToken.getDisplayContent();
	if (dc.mOpeningApps.contains(mAppWindowToken)) {
	return RemoteAnimationTarget.MODE_OPENING;
	} else if (dc.mChangingApps.contains(mAppWindowToken)) {
	return RemoteAnimationTarget.MODE_CHANGING;
	} else {
	return RemoteAnimationTarget.MODE_CLOSING;
	}
	}
	}

	private class RemoteAnimationAdapterWrapper implements AnimationAdapter {
	private final RemoteAnimationRecord mRecord;
	SurfaceControl mCapturedLeash;
	private OnAnimationFinishedCallback mCapturedFinishCallback;
	private final Point mPosition = new Point();
	private final Rect mStackBounds = new Rect();

	RemoteAnimationAdapterWrapper(RemoteAnimationRecord record, Point position,
	Rect stackBounds) {
	mRecord = record;
	mPosition.set(position.x, position.y);
	mStackBounds.set(stackBounds);
	}

	@Override
	public boolean getShowWallpaper() {
	return false;
	}

	@Override
	public int getBackgroundColor() {
	return 0;
	}

	@Override
	public void startAnimation(SurfaceControl animationLeash, Transaction t,
	OnAnimationFinishedCallback finishCallback) {
	if (DEBUG_REMOTE_ANIMATIONS) Slog.d(TAG, "startAnimation");

	// Restore z-layering, position and stack crop until client has a chance to modify it.
	t.setLayer(animationLeash, mRecord.mAppWindowToken.getPrefixOrderIndex());
	t.setPosition(animationLeash, mPosition.x, mPosition.y);
	mTmpRect.set(mStackBounds);
	mTmpRect.offsetTo(0, 0);
	t.setWindowCrop(animationLeash, mTmpRect);
	mCapturedLeash = animationLeash;
	mCapturedFinishCallback = finishCallback;
	}

	@Override
	public void onAnimationCancelled(SurfaceControl animationLeash) {
	if (mRecord.mAdapter == this) {
	mRecord.mAdapter = null;
	} else {
	mRecord.mThumbnailAdapter = null;
	}
	if (mRecord.mAdapter == null && mRecord.mThumbnailAdapter == null) {
	mPendingAnimations.remove(mRecord);
	}
	if (mPendingAnimations.isEmpty()) {
	mHandler.removeCallbacks(mTimeoutRunnable);
	releaseFinishedCallback();
	invokeAnimationCancelled();
	sendRunningRemoteAnimation(false);
	}
	}

	@Override
	public long getDurationHint() {
	return mRemoteAnimationAdapter.getDuration();
	}

	@Override
	public long getStatusBarTransitionsStartTime() {
	return SystemClock.uptimeMillis()
	+ mRemoteAnimationAdapter.getStatusBarTransitionDelay();
	}

	@Override
	public void dump(PrintWriter pw, String prefix) {
	pw.print(prefix); pw.print("token="); pw.println(mRecord.mAppWindowToken);
	if (mRecord.mTarget != null) {
	pw.print(prefix); pw.println("Target:");
	mRecord.mTarget.dump(pw, prefix + " ");
	} else {
	pw.print(prefix); pw.println("Target: null");
	}
	}

	@Override
	public void writeToProto(ProtoOutputStream proto) {
	final long token = proto.start(REMOTE);
	if (mRecord.mTarget != null) {
	mRecord.mTarget.writeToProto(proto, TARGET);
	}
	proto.end(token);
	}
	}
	}