1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.systemui; 18 19 import com.android.systemui.util.Assert; 20 21 import android.os.Handler; 22 import android.view.Choreographer; 23 24 import java.util.ArrayList; 25 26 /** 27 * Utility class for methods used to dejank the UI. 28 */ 29 public class DejankUtils { 30 31 private static final Choreographer sChoreographer = Choreographer.getInstance(); 32 private static final Handler sHandler = new Handler(); 33 34 private static final ArrayList<Runnable> sPendingRunnables = new ArrayList<>(); 35 36 private static final Runnable sAnimationCallbackRunnable = new Runnable() { 37 @Override 38 public void run() { 39 for (int i = 0; i < sPendingRunnables.size(); i++) { 40 sHandler.post(sPendingRunnables.get(i)); 41 } 42 sPendingRunnables.clear(); 43 } 44 }; 45 46 /** 47 * Executes {@code r} after performTraversals. Use this do to CPU heavy work for which the 48 * timing is not critical for animation. The work is then scheduled at the same time 49 * RenderThread is doing its thing, leading to better parallelization. 50 * 51 * <p>Needs to be called from the main thread. 52 */ postAfterTraversal(Runnable r)53 public static void postAfterTraversal(Runnable r) { 54 Assert.isMainThread(); 55 sPendingRunnables.add(r); 56 postAnimationCallback(); 57 } 58 59 /** 60 * Removes a previously scheduled runnable. 61 * 62 * <p>Needs to be called from the main thread. 63 */ removeCallbacks(Runnable r)64 public static void removeCallbacks(Runnable r) { 65 Assert.isMainThread(); 66 sPendingRunnables.remove(r); 67 sHandler.removeCallbacks(r); 68 } 69 postAnimationCallback()70 private static void postAnimationCallback() { 71 sChoreographer.postCallback(Choreographer.CALLBACK_ANIMATION, sAnimationCallbackRunnable, 72 null); 73 } 74 } 75