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// Copyright (c) the JPEG XL Project 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 "lib/extras/time.h"

#include <stdint.h>

#include <stdlib.h>

#include <ctime>

#include "lib/jxl/base/os_macros.h"  // for JXL_OS_*

#if JXL_OS_WIN

#ifndef NOMINMAX

#define NOMINMAX

#endif  // NOMINMAX

#include <windows.h>

#endif  // JXL_OS_WIN

#if JXL_OS_MAC

#include <mach/mach.h>

#include <mach/mach_time.h>

#endif  // JXL_OS_MAC

#if JXL_OS_HAIKU

#include <OS.h>

#endif  // JXL_OS_HAIKU

namespace jxl {

double Now() {

#if JXL_OS_WIN

  LARGE_INTEGER counter;

  (void)QueryPerformanceCounter(&counter);

  LARGE_INTEGER freq;

  (void)QueryPerformanceFrequency(&freq);

  return double(counter.QuadPart) / freq.QuadPart;

#elif JXL_OS_MAC

  const auto t = mach_absolute_time();

  // On OSX/iOS platform the elapsed time is cpu time unit

  // We have to query the time base information to convert it back

  // See https://developer.apple.com/library/mac/qa/qa1398/_index.html

  static mach_timebase_info_data_t timebase;

  if (timebase.denom == 0) {

    (void)mach_timebase_info(&timebase);

  return double(t) * timebase.numer / timebase.denom * 1E-9;  // notypo

#elif JXL_OS_HAIKU

  return double(system_time_nsecs()) * 1E-9;

#else

  timespec t;

  clock_gettime(CLOCK_MONOTONIC, &t);

  return t.tv_sec + t.tv_nsec * 1E-9;

#endif

}  // namespace jxl