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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkOncePtr.h"
#include "SkString.h"
#include "SkTime.h"
void SkTime::DateTime::toISO8601(SkString* dst) const {
if (dst) {
int timeZoneMinutes = SkToInt(fTimeZoneMinutes);
char timezoneSign = timeZoneMinutes >= 0 ? '+' : '-';
int timeZoneHours = SkTAbs(timeZoneMinutes) / 60;
timeZoneMinutes = SkTAbs(timeZoneMinutes) % 60;
dst->printf("%04u-%02u-%02uT%02u:%02u:%02u%c%02d:%02d",
static_cast<unsigned>(fYear), static_cast<unsigned>(fMonth),
static_cast<unsigned>(fDay), static_cast<unsigned>(fHour),
static_cast<unsigned>(fMinute),
static_cast<unsigned>(fSecond), timezoneSign, timeZoneHours,
timeZoneMinutes);
}
}
#if defined(_MSC_VER)
// TODO: try std::chrono again with MSVC 2015?
#include <intrin.h>
SK_DECLARE_STATIC_ONCE_PTR(double, ns_per_tick);
double SkTime::GetNSecs() {
uint64_t ticks = __rdtsc();
return ticks * *ns_per_tick.get([]{
LARGE_INTEGER khz; // The docs say this returns Hz, but it returns KHz.
QueryPerformanceFrequency(&khz);
return new double(1e6 / khz.QuadPart);
});
}
#elif defined(__MACH__)
// TODO: fold into std::chrono when available?
#include <mach/mach_time.h>
SK_DECLARE_STATIC_ONCE_PTR(double, ns_per_tick);
double SkTime::GetNSecs() {
uint64_t ticks = mach_absolute_time();
return ticks * *ns_per_tick.get([]{
mach_timebase_info_data_t timebase;
(void)mach_timebase_info(&timebase);
return new double(timebase.numer * 1.0 / timebase.denom);
});
}
#else
// This std::chrono code looks great on Linux and Android,
// but MSVC 2013 returned mostly garbage (0ns times, etc).
#include <chrono>
double SkTime::GetNSecs() {
auto now = std::chrono::high_resolution_clock::now();
std::chrono::duration<double, std::nano> ns = now.time_since_epoch();
return ns.count();
}
#endif
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