OLD | NEW |
1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 package org.chromium.ui; | 5 package org.chromium.ui; |
6 | 6 |
7 import android.annotation.SuppressLint; | 7 import android.annotation.SuppressLint; |
8 import android.content.Context; | 8 import android.content.Context; |
9 import android.os.Build; | 9 import android.os.Build; |
10 import android.os.Handler; | 10 import android.os.Handler; |
11 import android.view.Choreographer; | 11 import android.view.Choreographer; |
12 import android.view.WindowManager; | 12 import android.view.WindowManager; |
13 | 13 |
14 import org.chromium.base.TraceEvent; | 14 import org.chromium.base.TraceEvent; |
15 | 15 |
16 /** | 16 /** |
17 * Notifies clients of the default displays's vertical sync pulses. | 17 * Notifies clients of the default displays's vertical sync pulses. |
| 18 * This class works in "burst" mode: once the update is requested, the listener
will be |
| 19 * called MAX_VSYNC_COUNT times on the vertical sync pulses (on JB) or on every
refresh |
| 20 * period (on ICS, see below), unless stop() is called. |
18 * On ICS, VSyncMonitor relies on setVSyncPointForICS() being called to set a re
asonable | 21 * On ICS, VSyncMonitor relies on setVSyncPointForICS() being called to set a re
asonable |
19 * approximation of a vertical sync starting point; see also http://crbug.com/15
6397. | 22 * approximation of a vertical sync starting point; see also http://crbug.com/15
6397. |
20 */ | 23 */ |
21 @SuppressLint("NewApi") | 24 @SuppressLint("NewApi") |
22 public class VSyncMonitor { | 25 public class VSyncMonitor { |
23 private static final long NANOSECONDS_PER_SECOND = 1000000000; | 26 private static final long NANOSECONDS_PER_SECOND = 1000000000; |
24 private static final long NANOSECONDS_PER_MILLISECOND = 1000000; | 27 private static final long NANOSECONDS_PER_MILLISECOND = 1000000; |
25 private static final long NANOSECONDS_PER_MICROSECOND = 1000; | 28 private static final long NANOSECONDS_PER_MICROSECOND = 1000; |
| 29 public static final int MAX_AUTO_ONVSYNC_COUNT = 5; |
26 | 30 |
27 /** | 31 /** |
28 * VSync listener class | 32 * VSync listener class |
29 */ | 33 */ |
30 public interface Listener { | 34 public interface Listener { |
31 /** | 35 /** |
32 * Called very soon after the start of the display's vertical sync perio
d. | 36 * Called very soon after the start of the display's vertical sync perio
d. |
33 * @param monitor The VSyncMonitor that triggered the signal. | 37 * @param monitor The VSyncMonitor that triggered the signal. |
34 * @param vsyncTimeMicros Absolute frame time in microseconds. | 38 * @param vsyncTimeMicros Absolute frame time in microseconds. |
35 */ | 39 */ |
36 public void onVSync(VSyncMonitor monitor, long vsyncTimeMicros); | 40 public void onVSync(VSyncMonitor monitor, long vsyncTimeMicros); |
37 } | 41 } |
38 | 42 |
39 private Listener mListener; | 43 private Listener mListener; |
40 | 44 |
41 // Display refresh rate as reported by the system. | 45 // Display refresh rate as reported by the system. |
42 private final long mRefreshPeriodNano; | 46 private final long mRefreshPeriodNano; |
43 | 47 |
44 private boolean mHaveRequestInFlight; | 48 private boolean mHaveRequestInFlight; |
| 49 private int mTriggerNextVSyncCount; |
45 | 50 |
46 // Choreographer is used to detect vsync on >= JB. | 51 // Choreographer is used to detect vsync on >= JB. |
47 private final Choreographer mChoreographer; | 52 private final Choreographer mChoreographer; |
48 private final Choreographer.FrameCallback mVSyncFrameCallback; | 53 private final Choreographer.FrameCallback mVSyncFrameCallback; |
49 | 54 |
50 // On ICS we just post a task through the handler (http://crbug.com/156397) | 55 // On ICS we just post a task through the handler (http://crbug.com/156397) |
51 private final Runnable mVSyncRunnableCallback; | 56 private final Runnable mVSyncRunnableCallback; |
52 private long mGoodStartingPointNano; | 57 private long mGoodStartingPointNano; |
53 private long mLastPostedNano; | 58 private long mLastPostedNano; |
54 | 59 |
(...skipping 17 matching lines...) Expand all Loading... |
72 * @param context The application context. | 77 * @param context The application context. |
73 * @param listener The listener receiving VSync notifications. | 78 * @param listener The listener receiving VSync notifications. |
74 * @param enableJBVsync Whether to allow Choreographer-based notifications o
n JB and up. | 79 * @param enableJBVsync Whether to allow Choreographer-based notifications o
n JB and up. |
75 */ | 80 */ |
76 public VSyncMonitor(Context context, VSyncMonitor.Listener listener, boolean
enableJBVSync) { | 81 public VSyncMonitor(Context context, VSyncMonitor.Listener listener, boolean
enableJBVSync) { |
77 mListener = listener; | 82 mListener = listener; |
78 float refreshRate = ((WindowManager) context.getSystemService(Context.WI
NDOW_SERVICE)) | 83 float refreshRate = ((WindowManager) context.getSystemService(Context.WI
NDOW_SERVICE)) |
79 .getDefaultDisplay().getRefreshRate(); | 84 .getDefaultDisplay().getRefreshRate(); |
80 if (refreshRate <= 0) refreshRate = 60; | 85 if (refreshRate <= 0) refreshRate = 60; |
81 mRefreshPeriodNano = (long) (NANOSECONDS_PER_SECOND / refreshRate); | 86 mRefreshPeriodNano = (long) (NANOSECONDS_PER_SECOND / refreshRate); |
| 87 mTriggerNextVSyncCount = 0; |
82 | 88 |
83 if (enableJBVSync && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_
BEAN) { | 89 if (enableJBVSync && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_
BEAN) { |
84 // Use Choreographer on JB+ to get notified of vsync. | 90 // Use Choreographer on JB+ to get notified of vsync. |
85 mChoreographer = Choreographer.getInstance(); | 91 mChoreographer = Choreographer.getInstance(); |
86 mVSyncFrameCallback = new Choreographer.FrameCallback() { | 92 mVSyncFrameCallback = new Choreographer.FrameCallback() { |
87 @Override | 93 @Override |
88 public void doFrame(long frameTimeNanos) { | 94 public void doFrame(long frameTimeNanos) { |
89 TraceEvent.begin("VSync"); | 95 TraceEvent.begin("VSync"); |
90 mGoodStartingPointNano = frameTimeNanos; | 96 mGoodStartingPointNano = frameTimeNanos; |
91 onVSyncCallback(frameTimeNanos, getCurrentNanoTime()); | 97 onVSyncCallback(frameTimeNanos, getCurrentNanoTime()); |
(...skipping 40 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
132 */ | 138 */ |
133 private boolean isVSyncSignalAvailable() { | 139 private boolean isVSyncSignalAvailable() { |
134 return mChoreographer != null; | 140 return mChoreographer != null; |
135 } | 141 } |
136 | 142 |
137 /** | 143 /** |
138 * Stop reporting vsync events. Note that at most one pending vsync event ca
n still be delivered | 144 * Stop reporting vsync events. Note that at most one pending vsync event ca
n still be delivered |
139 * after this function is called. | 145 * after this function is called. |
140 */ | 146 */ |
141 public void stop() { | 147 public void stop() { |
| 148 mTriggerNextVSyncCount = 0; |
142 } | 149 } |
143 | 150 |
144 /** | 151 /** |
145 * Request to be notified of the closest display vsync events. | 152 * Request to be notified of the closest display vsync events. |
146 * Listener.onVSync() will be called soon after the upcoming vsync pulses. | 153 * Listener.onVSync() will be called soon after the upcoming vsync pulses. |
| 154 * It will be called at most MAX_AUTO_ONVSYNC_COUNT times unless requestUpda
te() is called. |
147 */ | 155 */ |
148 public void requestUpdate() { | 156 public void requestUpdate() { |
| 157 mTriggerNextVSyncCount = MAX_AUTO_ONVSYNC_COUNT; |
149 postCallback(); | 158 postCallback(); |
150 } | 159 } |
151 | 160 |
152 /** | 161 /** |
153 * Set the best guess of the point in the past when the vsync has happened. | 162 * Set the best guess of the point in the past when the vsync has happened. |
154 * @param goodStartingPointNano Known vsync point in the past. | 163 * @param goodStartingPointNano Known vsync point in the past. |
155 */ | 164 */ |
156 public void setVSyncPointForICS(long goodStartingPointNano) { | 165 public void setVSyncPointForICS(long goodStartingPointNano) { |
157 mGoodStartingPointNano = goodStartingPointNano; | 166 mGoodStartingPointNano = goodStartingPointNano; |
158 } | 167 } |
159 | 168 |
160 private long getCurrentNanoTime() { | 169 private long getCurrentNanoTime() { |
161 return System.nanoTime(); | 170 return System.nanoTime(); |
162 } | 171 } |
163 | 172 |
164 private void onVSyncCallback(long frameTimeNanos, long currentTimeNanos) { | 173 private void onVSyncCallback(long frameTimeNanos, long currentTimeNanos) { |
165 assert mHaveRequestInFlight; | 174 assert mHaveRequestInFlight; |
166 mHaveRequestInFlight = false; | 175 mHaveRequestInFlight = false; |
167 mLastVSyncCpuTimeNano = currentTimeNanos; | 176 mLastVSyncCpuTimeNano = currentTimeNanos; |
| 177 if (mTriggerNextVSyncCount >= 0) { |
| 178 mTriggerNextVSyncCount--; |
| 179 postCallback(); |
| 180 } |
168 if (mListener != null) { | 181 if (mListener != null) { |
169 mListener.onVSync(this, frameTimeNanos / NANOSECONDS_PER_MICROSECOND
); | 182 mListener.onVSync(this, frameTimeNanos / NANOSECONDS_PER_MICROSECOND
); |
170 } | 183 } |
171 } | 184 } |
172 | 185 |
173 private void postCallback() { | 186 private void postCallback() { |
174 if (mHaveRequestInFlight) return; | 187 if (mHaveRequestInFlight) return; |
175 mHaveRequestInFlight = true; | 188 mHaveRequestInFlight = true; |
176 if (postSyntheticVSync()) return; | 189 if (postSyntheticVSync()) return; |
177 if (isVSyncSignalAvailable()) { | 190 if (isVSyncSignalAvailable()) { |
(...skipping 28 matching lines...) Expand all Loading... |
206 | 219 |
207 if (currentTime + delay <= mLastPostedNano + mRefreshPeriodNano / 2) { | 220 if (currentTime + delay <= mLastPostedNano + mRefreshPeriodNano / 2) { |
208 delay += mRefreshPeriodNano; | 221 delay += mRefreshPeriodNano; |
209 } | 222 } |
210 | 223 |
211 mLastPostedNano = currentTime + delay; | 224 mLastPostedNano = currentTime + delay; |
212 if (delay == 0) mHandler.post(mVSyncRunnableCallback); | 225 if (delay == 0) mHandler.post(mVSyncRunnableCallback); |
213 else mHandler.postDelayed(mVSyncRunnableCallback, delay / NANOSECONDS_PE
R_MILLISECOND); | 226 else mHandler.postDelayed(mVSyncRunnableCallback, delay / NANOSECONDS_PE
R_MILLISECOND); |
214 } | 227 } |
215 } | 228 } |
OLD | NEW |