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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ppapi/shared_impl/time_conversion.h"
namespace ppapi {
namespace {
// Since WebKit doesn't use ticks for event times, we have to compute what
// the time ticks would be assuming the wall clock time doesn't change.
//
// This should only be used for WebKit times which we can't change the
// definition of.
double GetTimeToTimeTicksDeltaInSeconds() {
static double time_to_ticks_delta_seconds = 0.0;
if (time_to_ticks_delta_seconds == 0.0) {
double wall_clock = TimeToPPTime(base::Time::Now());
double ticks = TimeTicksToPPTimeTicks(base::TimeTicks::Now());
time_to_ticks_delta_seconds = ticks - wall_clock;
}
return time_to_ticks_delta_seconds;
}
} // namespace
PP_Time TimeToPPTime(base::Time t) {
return t.ToDoubleT();
}
base::Time PPTimeToTime(PP_Time t) {
// The time code handles exact "0" values as special, and produces
// a "null" Time object. But calling code would expect t==0 to represent the
// epoch (according to the description of PP_Time). Hence we just return the
// epoch in this case.
if (t == 0.0)
return base::Time::UnixEpoch();
return base::Time::FromDoubleT(t);
}
PP_TimeTicks TimeTicksToPPTimeTicks(base::TimeTicks t) {
return static_cast<double>(t.ToInternalValue()) /
base::Time::kMicrosecondsPerSecond;
}
PP_TimeTicks EventTimeToPPTimeTicks(double event_time) {
return event_time + GetTimeToTimeTicksDeltaInSeconds();
}
double PPTimeTicksToEventTime(PP_TimeTicks t) {
return t - GetTimeToTimeTicksDeltaInSeconds();
}
double PPGetLocalTimeZoneOffset(const base::Time& time) {
// Explode it to local time and then unexplode it as if it were UTC. Also
// explode it to UTC and unexplode it (this avoids mismatching rounding or
// lack thereof). The time zone offset is their difference.
base::Time::Exploded exploded = { 0 };
base::Time::Exploded utc_exploded = { 0 };
time.LocalExplode(&exploded);
time.UTCExplode(&utc_exploded);
if (exploded.HasValidValues() && utc_exploded.HasValidValues()) {
base::Time adj_time = base::Time::FromUTCExploded(exploded);
base::Time cur = base::Time::FromUTCExploded(utc_exploded);
return (adj_time - cur).InSecondsF();
}
return 0.0;
}
} // namespace ppapi
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