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.view.Choreographer; 21 22 import com.android.internal.annotations.VisibleForTesting; 23 import com.android.systemui.util.Assert; 24 25 import java.util.ArrayList; 26 27 /** 28 * Utility class for methods used to dejank the UI. 29 */ 30 public class DejankUtils { 31 32 private static final Choreographer sChoreographer = Choreographer.getInstance(); 33 private static final Handler sHandler = new Handler(); 34 private static final ArrayList<Runnable> sPendingRunnables = new ArrayList<>(); 35 36 /** 37 * Only for testing. 38 */ 39 private static boolean sImmediate; 40 41 private static final Runnable sAnimationCallbackRunnable = new Runnable() { 42 @Override 43 public void run() { 44 for (int i = 0; i < sPendingRunnables.size(); i++) { 45 sHandler.post(sPendingRunnables.get(i)); 46 } 47 sPendingRunnables.clear(); 48 } 49 }; 50 51 /** 52 * Executes {@code r} after performTraversals. Use this do to CPU heavy work for which the 53 * timing is not critical for animation. The work is then scheduled at the same time 54 * RenderThread is doing its thing, leading to better parallelization. 55 * 56 * <p>Needs to be called from the main thread. 57 */ postAfterTraversal(Runnable r)58 public static void postAfterTraversal(Runnable r) { 59 if (sImmediate) { 60 r.run(); 61 return; 62 } 63 Assert.isMainThread(); 64 sPendingRunnables.add(r); 65 postAnimationCallback(); 66 } 67 68 /** 69 * Removes a previously scheduled runnable. 70 * 71 * <p>Needs to be called from the main thread. 72 */ removeCallbacks(Runnable r)73 public static void removeCallbacks(Runnable r) { 74 Assert.isMainThread(); 75 sPendingRunnables.remove(r); 76 sHandler.removeCallbacks(r); 77 } 78 postAnimationCallback()79 private static void postAnimationCallback() { 80 sChoreographer.postCallback(Choreographer.CALLBACK_ANIMATION, sAnimationCallbackRunnable, 81 null); 82 } 83 84 @VisibleForTesting setImmediate(boolean immediate)85 public static void setImmediate(boolean immediate) { 86 sImmediate = immediate; 87 } 88 } 89