dart_timestamp_provider.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_RUNTIME_DART_TIMESTAMP_PROVIDER_H_
#define FLUTTER_RUNTIME_DART_TIMESTAMP_PROVIDER_H_
 
#include "flutter/fml/time/timestamp_provider.h"
 
#include "flutter/fml/macros.h"
#include "flutter/fml/time/time_point.h"
 
namespace flutter {
 
fml::TimePoint DartTimelineTicksSinceEpoch();
 
/// TimestampProvider implementation that is backed by Dart_TimelineGetTicks
class DartTimestampProvider : fml::TimestampProvider {
 public:
  static DartTimestampProvider& Instance() {
    static DartTimestampProvider instance;
    return instance;
  }
 
  ~DartTimestampProvider() override;
 
  fml::TimePoint Now() override;
 
 private:
  static constexpr int64_t kNanosPerSecond = 1000000000;
 
  int64_t ConvertToNanos(int64_t ticks, int64_t frequency);
 
  DartTimestampProvider();
 
  FML_DISALLOW_COPY_AND_ASSIGN(DartTimestampProvider);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_RUNTIME_DART_TIMESTAMP_PROVIDER_H_