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/*
* 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 android.view;
import android.annotation.NonNull;
import android.graphics.HardwareRendererObserver;
import android.os.Handler;
import java.lang.ref.WeakReference;
/**
* Provides streaming access to frame stats information from the rendering
* subsystem to apps.
*
* @hide
*/
public class FrameMetricsObserver
implements HardwareRendererObserver.OnFrameMetricsAvailableListener {
private final WeakReference<Window> mWindow;
private final FrameMetrics mFrameMetrics;
private final HardwareRendererObserver mObserver;
/*package*/ final Window.OnFrameMetricsAvailableListener mListener;
/**
* Creates a FrameMetricsObserver
*
* @param handler the Handler to use when invoking callbacks
*/
FrameMetricsObserver(@NonNull Window window, @NonNull Handler handler,
@NonNull Window.OnFrameMetricsAvailableListener listener) {
mWindow = new WeakReference<>(window);
mListener = listener;
mFrameMetrics = new FrameMetrics();
mObserver = new HardwareRendererObserver(this, mFrameMetrics.mTimingData, handler,
false /*waitForPresentTime*/);
}
/**
* Implementation of OnFrameMetricsAvailableListener
* @param dropCountSinceLastInvocation the number of reports dropped since the last time
* @Override
*/
public void onFrameMetricsAvailable(int dropCountSinceLastInvocation) {
if (mWindow.get() != null) {
mListener.onFrameMetricsAvailable(mWindow.get(), mFrameMetrics,
dropCountSinceLastInvocation);
}
}
/*package*/ HardwareRendererObserver getRendererObserver() {
return mObserver;
}
}
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