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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.os.Looper;
import android.os.MessageQueue;
import com.android.internal.util.VirtualRefBasePtr;
import java.lang.ref.WeakReference;
/**
* Provides streaming access to frame stats information from the rendering
* subsystem to apps.
*
* @hide
*/
public class FrameMetricsObserver {
private MessageQueue mMessageQueue;
private WeakReference<Window> mWindow;
private FrameMetrics mFrameMetrics;
/* package */ Window.OnFrameMetricsAvailableListener mListener;
/* package */ VirtualRefBasePtr mNative;
/**
* Creates a FrameMetricsObserver
*
* @param looper the looper to use when invoking callbacks
*/
FrameMetricsObserver(@NonNull Window window, @NonNull Looper looper,
@NonNull Window.OnFrameMetricsAvailableListener listener) {
if (looper == null) {
throw new NullPointerException("looper cannot be null");
}
mMessageQueue = looper.getQueue();
if (mMessageQueue == null) {
throw new IllegalStateException("invalid looper, null message queue\n");
}
mFrameMetrics = new FrameMetrics();
mWindow = new WeakReference<>(window);
mListener = listener;
}
// Called by native on the provided Handler
@SuppressWarnings("unused")
private void notifyDataAvailable(int dropCount) {
final Window window = mWindow.get();
if (window != null) {
mListener.onFrameMetricsAvailable(window, mFrameMetrics, dropCount);
}
}
}
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