/*
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* Copyright (C) 2015 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.systemui;
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import android.os.Handler;
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import android.view.Choreographer;
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import com.android.internal.annotations.VisibleForTesting;
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import com.android.systemui.util.Assert;
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import java.util.ArrayList;
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/**
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* Utility class for methods used to dejank the UI.
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*/
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public class DejankUtils {
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private static final Choreographer sChoreographer = Choreographer.getInstance();
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private static final Handler sHandler = new Handler();
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private static final ArrayList<Runnable> sPendingRunnables = new ArrayList<>();
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/**
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* Only for testing.
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*/
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private static boolean sImmediate;
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private static final Runnable sAnimationCallbackRunnable = new Runnable() {
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@Override
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public void run() {
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for (int i = 0; i < sPendingRunnables.size(); i++) {
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sHandler.post(sPendingRunnables.get(i));
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}
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sPendingRunnables.clear();
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}
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};
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/**
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* Executes {@code r} after performTraversals. Use this do to CPU heavy work for which the
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* timing is not critical for animation. The work is then scheduled at the same time
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* RenderThread is doing its thing, leading to better parallelization.
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*
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* <p>Needs to be called from the main thread.
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*/
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public static void postAfterTraversal(Runnable r) {
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if (sImmediate) {
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r.run();
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return;
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}
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Assert.isMainThread();
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sPendingRunnables.add(r);
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postAnimationCallback();
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}
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/**
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* Removes a previously scheduled runnable.
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*
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* <p>Needs to be called from the main thread.
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*/
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public static void removeCallbacks(Runnable r) {
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Assert.isMainThread();
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sPendingRunnables.remove(r);
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sHandler.removeCallbacks(r);
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}
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private static void postAnimationCallback() {
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sChoreographer.postCallback(Choreographer.CALLBACK_ANIMATION, sAnimationCallbackRunnable,
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null);
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}
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@VisibleForTesting
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public static void setImmediate(boolean immediate) {
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sImmediate = immediate;
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}
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}
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