| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.wm.flicker.monitor; |
| |
| import static android.view.FrameStats.UNDEFINED_TIME_NANO; |
| |
| import android.app.Instrumentation; |
| import android.util.Log; |
| import android.view.FrameStats; |
| |
| /** |
| * Monitors {@link android.view.WindowAnimationFrameStats} to detect janky frames. |
| * |
| * Adapted from {@link androidx.test.jank.internal.WindowAnimationFrameStatsMonitorImpl} |
| * using the same threshold to determine jank. |
| */ |
| public class WindowAnimationFrameStatsMonitor implements ITransitionMonitor { |
| |
| private static final String TAG = "FLICKER"; |
| // Maximum normalized error in frame duration before the frame is considered janky |
| private static final double MAX_ERROR = 0.5f; |
| // Maximum normalized frame duration before the frame is considered a pause |
| private static final double PAUSE_THRESHOLD = 15.0f; |
| private Instrumentation mInstrumentation; |
| private FrameStats stats; |
| private int numJankyFrames; |
| private long mLongestFrameNano = 0L; |
| |
| |
| /** |
| * Constructs a WindowAnimationFrameStatsMonitor instance. |
| */ |
| public WindowAnimationFrameStatsMonitor(Instrumentation instrumentation) { |
| mInstrumentation = instrumentation; |
| } |
| |
| private void analyze() { |
| int frameCount = stats.getFrameCount(); |
| long refreshPeriodNano = stats.getRefreshPeriodNano(); |
| |
| // Skip first frame |
| for (int i = 2; i < frameCount; i++) { |
| // Handle frames that have not been presented. |
| if (stats.getFramePresentedTimeNano(i) == UNDEFINED_TIME_NANO) { |
| // The animation must not have completed. Warn and break out of the loop. |
| Log.w(TAG, "Skipping fenced frame."); |
| break; |
| } |
| long frameDurationNano = stats.getFramePresentedTimeNano(i) - |
| stats.getFramePresentedTimeNano(i - 1); |
| double normalized = (double) frameDurationNano / refreshPeriodNano; |
| if (normalized < PAUSE_THRESHOLD) { |
| if (normalized > 1.0f + MAX_ERROR) { |
| numJankyFrames++; |
| } |
| mLongestFrameNano = Math.max(mLongestFrameNano, frameDurationNano); |
| } |
| } |
| } |
| |
| @Override |
| public void start() { |
| // Clear out any previous data |
| numJankyFrames = 0; |
| mLongestFrameNano = 0; |
| mInstrumentation.getUiAutomation().clearWindowAnimationFrameStats(); |
| } |
| |
| @Override |
| public void stop() { |
| stats = mInstrumentation.getUiAutomation().getWindowAnimationFrameStats(); |
| analyze(); |
| } |
| |
| public boolean jankyFramesDetected() { |
| return stats.getFrameCount() > 0 && numJankyFrames > 0; |
| } |
| |
| @Override |
| public String toString() { |
| return stats.toString() + |
| " RefreshPeriodNano:" + stats.getRefreshPeriodNano() + |
| " NumJankyFrames:" + numJankyFrames + |
| " LongestFrameNano:" + mLongestFrameNano; |
| } |
| } |