sky/engine/testing/platform/platform_impl.cc

// Copyright 2014 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 "sky/engine/testing/platform/platform_impl.h"

#include <cmath>

#include "base/rand_util.h"
#include "base/stl_util.h"
#include "base/synchronization/waitable_event.h"
#include "base/time/time.h"
#include "net/base/data_url.h"
#include "net/base/mime_util.h"
#include "net/base/net_errors.h"

namespace sky {

PlatformImpl::PlatformImpl()
    : main_loop_(base::MessageLoop::current()),
      shared_timer_func_(NULL),
      shared_timer_fire_time_(0.0),
      shared_timer_fire_time_was_set_while_suspended_(false),
      shared_timer_suspended_(0) {
}

PlatformImpl::~PlatformImpl() {
}

blink::WebString PlatformImpl::defaultLocale() {
  return blink::WebString::fromUTF8("en-US");
}

double PlatformImpl::currentTime() {
  return base::Time::Now().ToDoubleT();
}

double PlatformImpl::monotonicallyIncreasingTime() {
  return base::TimeTicks::Now().ToInternalValue() /
      static_cast<double>(base::Time::kMicrosecondsPerSecond);
}

void PlatformImpl::setSharedTimerFiredFunction(void (*func)()) {
  shared_timer_func_ = func;
}

void PlatformImpl::setSharedTimerFireInterval(
    double interval_seconds) {
  shared_timer_fire_time_ = interval_seconds + monotonicallyIncreasingTime();
  if (shared_timer_suspended_) {
    shared_timer_fire_time_was_set_while_suspended_ = true;
    return;
  }

  // By converting between double and int64 representation, we run the risk
  // of losing precision due to rounding errors. Performing computations in
  // microseconds reduces this risk somewhat. But there still is the potential
  // of us computing a fire time for the timer that is shorter than what we
  // need.
  // As the event loop will check event deadlines prior to actually firing
  // them, there is a risk of needlessly rescheduling events and of
  // needlessly looping if sleep times are too short even by small amounts.
  // This results in measurable performance degradation unless we use ceil() to
  // always round up the sleep times.
  int64 interval = static_cast<int64>(
      ceil(interval_seconds * base::Time::kMillisecondsPerSecond)
      * base::Time::kMicrosecondsPerMillisecond);

  if (interval < 0)
    interval = 0;

  shared_timer_.Stop();
  shared_timer_.Start(FROM_HERE, base::TimeDelta::FromMicroseconds(interval),
                      this, &PlatformImpl::DoTimeout);
}

void PlatformImpl::stopSharedTimer() {
  shared_timer_.Stop();
}

blink::WebUnitTestSupport* PlatformImpl::unitTestSupport() {
  return &unit_test_support_;
}

const unsigned char* PlatformImpl::getTraceCategoryEnabledFlag(
    const char* category_name) {
  static const unsigned char buf[] = "*";
  return buf;
}

}  // namespace sky