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Side by Side Diff: webkit/plugins/ppapi/time_conversion.cc

Issue 7237044: Make PP_TimeTicks actually be a tick counter rather than be the same as the (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 9 years, 5 months ago
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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "webkit/plugins/ppapi/time_conversion.h"
6
7 namespace webkit {
8 namespace ppapi {
9
10 namespace {
11
12 // Since WebKit doesn't use ticks for event times, we have to compute what
13 // the time ticks would be assuming the wall clock time doesn't change.
14 //
15 // This should only be used for WebKit times which we can't change the
darin (slow to review) 2011/07/08 16:17:25 We might want to look into fixing this at some poi
16 // definition of.
17 double GetTimeToTimeTicksDeltaInSeconds() {
18 static double time_to_ticks_delta_seconds = 0.0;
19 if (time_to_ticks_delta_seconds == 0.0) {
20 double wall_clock = TimeToPPTime(base::Time::Now());
21 double ticks = TimeTicksToPPTimeTicks(base::TimeTicks::Now());
22 time_to_ticks_delta_seconds = ticks - wall_clock;
23 }
24 return time_to_ticks_delta_seconds;
25 }
26
27 } // namespace
28
29 PP_Time TimeToPPTime(base::Time t) {
30 return t.ToDoubleT();
31 }
32
33 base::Time PPTimeToTime(PP_Time t) {
34 return base::Time::FromDoubleT(t);
35 }
36
37 PP_TimeTicks TimeTicksToPPTimeTicks(base::TimeTicks t) {
38 return static_cast<double>(t.ToInternalValue() /
39 base::Time::kMicrosecondsPerSecond);
40 }
41
42 PP_TimeTicks EventTimeToPPTimeTicks(double event_time) {
43 return event_time + GetTimeToTimeTicksDeltaInSeconds();
44 }
45
46 double PPTimeTicksToEventTime(PP_TimeTicks t) {
47 return t - GetTimeToTimeTicksDeltaInSeconds();
48 }
49
50 } // namespace ppapi
51 } // namespace webkit
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