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 android.os.Handler; 20 import android.os.Looper; 21 import android.view.Choreographer; 22 23 import java.util.ArrayList; 24 25 /** 26 * Utility class for methods used to dejank the UI. 27 */ 28 public class DejankUtils { 29 30 private static final Choreographer sChoreographer = Choreographer.getInstance(); 31 private static final Handler sHandler = new Handler(); 32 33 private static final ArrayList<Runnable> sPendingRunnables = new ArrayList<>(); 34 35 private static final Runnable sAnimationCallbackRunnable = new Runnable() { 36 @Override 37 public void run() { 38 for (int i = 0; i < sPendingRunnables.size(); i++) { 39 sHandler.post(sPendingRunnables.get(i)); 40 } 41 sPendingRunnables.clear(); 42 } 43 }; 44 45 /** 46 * Executes {@code r} after performTraversals. Use this do to CPU heavy work for which the 47 * timing is not critical for animation. The work is then scheduled at the same time 48 * RenderThread is doing its thing, leading to better parallelization. 49 * 50 * <p>Needs to be called from the main thread. 51 */ postAfterTraversal(Runnable r)52 public static void postAfterTraversal(Runnable r) { 53 throwIfNotCalledOnMainThread(); 54 sPendingRunnables.add(r); 55 postAnimationCallback(); 56 } 57 58 /** 59 * Removes a previously scheduled runnable. 60 * 61 * <p>Needs to be called from the main thread. 62 */ removeCallbacks(Runnable r)63 public static void removeCallbacks(Runnable r) { 64 throwIfNotCalledOnMainThread(); 65 sPendingRunnables.remove(r); 66 sHandler.removeCallbacks(r); 67 } 68 postAnimationCallback()69 private static void postAnimationCallback() { 70 sChoreographer.postCallback(Choreographer.CALLBACK_ANIMATION, sAnimationCallbackRunnable, 71 null); 72 } 73 throwIfNotCalledOnMainThread()74 private static void throwIfNotCalledOnMainThread() { 75 if (!Looper.getMainLooper().isCurrentThread()) { 76 throw new IllegalStateException("should be called from the main thread."); 77 } 78 } 79 } 80