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/*
* Copyright (C) 2020 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.quickstep.util;
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.view.SurfaceControl;
import android.view.SurfaceControl.Transaction;
import android.view.View;
import android.view.View.OnAttachStateChangeListener;
import android.view.ViewRootImpl;
import com.android.quickstep.RemoteAnimationTargets.ReleaseCheck;
/**
* Helper class to apply surface transactions in sync with RenderThread similar to
* android.view.SyncRtSurfaceTransactionApplier
* with some Launcher specific utility methods
*/
@TargetApi(Build.VERSION_CODES.R)
public class SurfaceTransactionApplier extends ReleaseCheck {
private static final int MSG_UPDATE_SEQUENCE_NUMBER = 0;
private final Handler mApplyHandler;
private boolean mInitialized;
private SurfaceControl mBarrierSurfaceControl;
private ViewRootImpl mTargetViewRootImpl;
private int mLastSequenceNumber = 0;
/**
* @param targetView The view in the surface that acts as synchronization anchor.
*/
public SurfaceTransactionApplier(View targetView) {
if (targetView.isAttachedToWindow()) {
initialize(targetView);
} else {
mInitialized = false;
targetView.addOnAttachStateChangeListener(new OnAttachStateChangeListener() {
@Override
public void onViewAttachedToWindow(View v) {
if (!mInitialized) {
targetView.removeOnAttachStateChangeListener(this);
initialize(targetView);
}
}
@Override
public void onViewDetachedFromWindow(View v) {
// Do nothing
}
});
}
mApplyHandler = new Handler(this::onApplyMessage);
setCanRelease(true);
}
private void initialize(View view) {
mTargetViewRootImpl = view.getViewRootImpl();
mBarrierSurfaceControl = mTargetViewRootImpl.getSurfaceControl();
mInitialized = true;
}
protected boolean onApplyMessage(Message msg) {
if (msg.what == MSG_UPDATE_SEQUENCE_NUMBER) {
setCanRelease(msg.arg1 == mLastSequenceNumber);
return true;
}
return false;
}
/**
* Schedules applying surface parameters on the next frame.
*
* @param params The surface parameters to apply. DO NOT MODIFY the list after passing into
* this method to avoid synchronization issues.
*/
public void scheduleApply(SurfaceTransaction params) {
if (!mInitialized) {
params.getTransaction().apply();
return;
}
View view = mTargetViewRootImpl.getView();
if (view == null) {
return;
}
Transaction t = params.getTransaction();
mLastSequenceNumber++;
final int toApplySeqNo = mLastSequenceNumber;
setCanRelease(false);
mTargetViewRootImpl.registerRtFrameCallback(frame -> {
if (mBarrierSurfaceControl == null || !mBarrierSurfaceControl.isValid()) {
Message.obtain(mApplyHandler, MSG_UPDATE_SEQUENCE_NUMBER, toApplySeqNo, 0)
.sendToTarget();
return;
}
mTargetViewRootImpl.mergeWithNextTransaction(t, frame);
Message.obtain(mApplyHandler, MSG_UPDATE_SEQUENCE_NUMBER, toApplySeqNo, 0)
.sendToTarget();
});
// Make sure a frame gets scheduled.
view.invalidate();
}
}
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