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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 * On ICS, VSyncMonitor relies on setVSyncPointForICS() being called to set a re asonable | 18 * 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. | 19 * approximation of a vertical sync starting point; see also http://crbug.com/15 6397. |
20 */ | 20 */ |
21 @SuppressLint("NewApi") | 21 @SuppressLint("NewApi") |
22 public class VSyncMonitor { | 22 public class VSyncMonitor { |
23 private static final long NANOSECONDS_PER_SECOND = 1000000000; | 23 private static final long NANOSECONDS_PER_SECOND = 1000000000; |
24 private static final long NANOSECONDS_PER_MILLISECOND = 1000000; | 24 private static final long NANOSECONDS_PER_MILLISECOND = 1000000; |
25 private static final long NANOSECONDS_PER_MICROSECOND = 1000; | 25 private static final long NANOSECONDS_PER_MICROSECOND = 1000; |
26 | 26 |
27 private static final long MAX_VALID_VSYNC_PERIOD_NANOSECONDS = NANOSECONDS_P ER_SECOND / 30; | |
jdduke (slow)
2014/10/08 03:17:02
I don't think this is used any longer?
| |
28 | |
27 private boolean mInsideVSync = false; | 29 private boolean mInsideVSync = false; |
28 | 30 |
31 // Conservative guess about vsync's consecutivity. | |
32 // If true, next tick is guaranteed to be consecutive. | |
33 private boolean mConsecutiveVSync = false; | |
34 | |
29 /** | 35 /** |
30 * VSync listener class | 36 * VSync listener class |
31 */ | 37 */ |
32 public interface Listener { | 38 public interface Listener { |
33 /** | 39 /** |
34 * Called very soon after the start of the display's vertical sync perio d. | 40 * Called very soon after the start of the display's vertical sync perio d. |
35 * @param monitor The VSyncMonitor that triggered the signal. | 41 * @param monitor The VSyncMonitor that triggered the signal. |
36 * @param vsyncTimeMicros Absolute frame time in microseconds. | 42 * @param vsyncTimeMicros Absolute frame time in microseconds. |
37 */ | 43 */ |
38 public void onVSync(VSyncMonitor monitor, long vsyncTimeMicros); | 44 public void onVSync(VSyncMonitor monitor, long vsyncTimeMicros); |
39 } | 45 } |
40 | 46 |
41 private Listener mListener; | 47 private Listener mListener; |
42 | 48 |
43 // Display refresh rate as reported by the system. | 49 // Display refresh rate as reported by the system. |
44 private final long mRefreshPeriodNano; | 50 private long mRefreshPeriodNano; |
45 | 51 |
46 private boolean mHaveRequestInFlight; | 52 private boolean mHaveRequestInFlight; |
47 | 53 |
48 // Choreographer is used to detect vsync on >= JB. | 54 // Choreographer is used to detect vsync on >= JB. |
49 private final Choreographer mChoreographer; | 55 private final Choreographer mChoreographer; |
50 private final Choreographer.FrameCallback mVSyncFrameCallback; | 56 private final Choreographer.FrameCallback mVSyncFrameCallback; |
51 | 57 |
52 // On ICS we just post a task through the handler (http://crbug.com/156397) | 58 // On ICS we just post a task through the handler (http://crbug.com/156397) |
53 private final Runnable mVSyncRunnableCallback; | 59 private final Runnable mVSyncRunnableCallback; |
54 private long mGoodStartingPointNano; | 60 private long mGoodStartingPointNano; |
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72 /** | 78 /** |
73 * Constructs a VSyncMonitor | 79 * Constructs a VSyncMonitor |
74 * @param context The application context. | 80 * @param context The application context. |
75 * @param listener The listener receiving VSync notifications. | 81 * @param listener The listener receiving VSync notifications. |
76 * @param enableJBVsync Whether to allow Choreographer-based notifications o n JB and up. | 82 * @param enableJBVsync Whether to allow Choreographer-based notifications o n JB and up. |
77 */ | 83 */ |
78 public VSyncMonitor(Context context, VSyncMonitor.Listener listener, boolean enableJBVSync) { | 84 public VSyncMonitor(Context context, VSyncMonitor.Listener listener, boolean enableJBVSync) { |
79 mListener = listener; | 85 mListener = listener; |
80 float refreshRate = ((WindowManager) context.getSystemService(Context.WI NDOW_SERVICE)) | 86 float refreshRate = ((WindowManager) context.getSystemService(Context.WI NDOW_SERVICE)) |
81 .getDefaultDisplay().getRefreshRate(); | 87 .getDefaultDisplay().getRefreshRate(); |
88 final boolean useEstimatedRefreshPeriod = refreshRate < 30; | |
jdduke (slow)
2014/10/08 03:17:02
I see 30 both here and above in the MAX_VALID_VSYN
| |
89 | |
82 if (refreshRate <= 0) refreshRate = 60; | 90 if (refreshRate <= 0) refreshRate = 60; |
83 mRefreshPeriodNano = (long) (NANOSECONDS_PER_SECOND / refreshRate); | 91 mRefreshPeriodNano = (long) (NANOSECONDS_PER_SECOND / refreshRate); |
84 | 92 |
85 if (enableJBVSync && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_ BEAN) { | 93 if (enableJBVSync && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_ BEAN) { |
86 // Use Choreographer on JB+ to get notified of vsync. | 94 // Use Choreographer on JB+ to get notified of vsync. |
87 mChoreographer = Choreographer.getInstance(); | 95 mChoreographer = Choreographer.getInstance(); |
88 mVSyncFrameCallback = new Choreographer.FrameCallback() { | 96 mVSyncFrameCallback = new Choreographer.FrameCallback() { |
89 @Override | 97 @Override |
90 public void doFrame(long frameTimeNanos) { | 98 public void doFrame(long frameTimeNanos) { |
91 TraceEvent.begin("VSync"); | 99 TraceEvent.begin("VSync"); |
100 if (useEstimatedRefreshPeriod && mConsecutiveVSync) { | |
101 // Display.getRefreshRate() is unreliable on some platfo rms. | |
102 // Adjust refresh period- initial value is based on Disp lay.getRefreshRate() | |
103 // after that it asymptotically approaches the real valu e. | |
104 long lastRefreshDurationNano = frameTimeNanos - mGoodSta rtingPointNano; | |
105 float lastRefreshDurationWeight = 0.1f; | |
106 mRefreshPeriodNano += (long) (lastRefreshDurationWeight * | |
jdduke (slow)
2014/10/08 03:17:02
Hmm, I could be wrong, but don't you need to rewei
Sami
2014/10/08 10:14:51
Hmm, I think that reduces to mRefreshPeriodNano =
jdduke (slow)
2014/10/08 13:06:00
Of course, sigh, I should actually read the variab
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107 (lastRefreshDurationNano - mRefreshPeriodNano)); | |
108 } | |
92 mGoodStartingPointNano = frameTimeNanos; | 109 mGoodStartingPointNano = frameTimeNanos; |
93 onVSyncCallback(frameTimeNanos, getCurrentNanoTime()); | 110 onVSyncCallback(frameTimeNanos, getCurrentNanoTime()); |
94 TraceEvent.end("VSync"); | 111 TraceEvent.end("VSync"); |
95 } | 112 } |
96 }; | 113 }; |
97 mVSyncRunnableCallback = null; | 114 mVSyncRunnableCallback = null; |
98 } else { | 115 } else { |
99 // On ICS we just hope that running tasks is relatively predictable. | 116 // On ICS we just hope that running tasks is relatively predictable. |
100 mChoreographer = null; | 117 mChoreographer = null; |
101 mVSyncFrameCallback = null; | 118 mVSyncFrameCallback = null; |
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179 } finally { | 196 } finally { |
180 mInsideVSync = false; | 197 mInsideVSync = false; |
181 } | 198 } |
182 } | 199 } |
183 | 200 |
184 private void postCallback() { | 201 private void postCallback() { |
185 if (mHaveRequestInFlight) return; | 202 if (mHaveRequestInFlight) return; |
186 mHaveRequestInFlight = true; | 203 mHaveRequestInFlight = true; |
187 if (postSyntheticVSync()) return; | 204 if (postSyntheticVSync()) return; |
188 if (isVSyncSignalAvailable()) { | 205 if (isVSyncSignalAvailable()) { |
206 mConsecutiveVSync = mInsideVSync; | |
189 mChoreographer.postFrameCallback(mVSyncFrameCallback); | 207 mChoreographer.postFrameCallback(mVSyncFrameCallback); |
190 } else { | 208 } else { |
191 postRunnableCallback(); | 209 postRunnableCallback(); |
192 } | 210 } |
193 } | 211 } |
194 | 212 |
195 private boolean postSyntheticVSync() { | 213 private boolean postSyntheticVSync() { |
196 final long currentTime = getCurrentNanoTime(); | 214 final long currentTime = getCurrentNanoTime(); |
197 // Only trigger a synthetic vsync if we've been idle for long enough and the upcoming real | 215 // Only trigger a synthetic vsync if we've been idle for long enough and the upcoming real |
198 // vsync is more than half a frame away. | 216 // vsync is more than half a frame away. |
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217 | 235 |
218 if (currentTime + delay <= mLastPostedNano + mRefreshPeriodNano / 2) { | 236 if (currentTime + delay <= mLastPostedNano + mRefreshPeriodNano / 2) { |
219 delay += mRefreshPeriodNano; | 237 delay += mRefreshPeriodNano; |
220 } | 238 } |
221 | 239 |
222 mLastPostedNano = currentTime + delay; | 240 mLastPostedNano = currentTime + delay; |
223 if (delay == 0) mHandler.post(mVSyncRunnableCallback); | 241 if (delay == 0) mHandler.post(mVSyncRunnableCallback); |
224 else mHandler.postDelayed(mVSyncRunnableCallback, delay / NANOSECONDS_PE R_MILLISECOND); | 242 else mHandler.postDelayed(mVSyncRunnableCallback, delay / NANOSECONDS_PE R_MILLISECOND); |
225 } | 243 } |
226 } | 244 } |
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