Sunny Goyal
6bc4257d86
Bug: 221961069 Test: Presubmit Change-Id: I04091ebc9f3d88d2dbbde1bf0d5390c815e026d1
84 lines
2.5 KiB
Java
84 lines
2.5 KiB
Java
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.util.window;
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import static android.view.Display.DEFAULT_DISPLAY;
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import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
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import android.content.Context;
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import android.hardware.display.DisplayManager;
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import android.hardware.display.DisplayManager.DisplayListener;
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import android.view.Display;
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import androidx.annotation.WorkerThread;
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import com.android.launcher3.util.MainThreadInitializedObject;
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import com.android.launcher3.util.SafeCloseable;
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/**
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* Utility class to track refresh rate of the current device
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*/
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public class RefreshRateTracker implements DisplayListener, SafeCloseable {
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private static final MainThreadInitializedObject<RefreshRateTracker> INSTANCE =
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new MainThreadInitializedObject<>(RefreshRateTracker::new);
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private int mSingleFrameMs = 1;
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private final DisplayManager mDM;
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private RefreshRateTracker(Context context) {
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mDM = context.getSystemService(DisplayManager.class);
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updateSingleFrameMs();
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mDM.registerDisplayListener(this, UI_HELPER_EXECUTOR.getHandler());
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}
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/**
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* Returns the single frame time in ms
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*/
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public static int getSingleFrameMs(Context context) {
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return INSTANCE.get(context).mSingleFrameMs;
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}
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@Override
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public final void onDisplayAdded(int displayId) { }
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@Override
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public final void onDisplayRemoved(int displayId) { }
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@WorkerThread
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@Override
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public final void onDisplayChanged(int displayId) {
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if (displayId == DEFAULT_DISPLAY) {
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updateSingleFrameMs();
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}
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}
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private void updateSingleFrameMs() {
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Display display = mDM.getDisplay(DEFAULT_DISPLAY);
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if (display != null) {
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float refreshRate = display.getRefreshRate();
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mSingleFrameMs = refreshRate > 0 ? (int) (1000 / refreshRate) : 16;
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}
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}
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@Override
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public void close() {
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mDM.unregisterDisplayListener(this);
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}
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}
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