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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_FLOW_INSTRUMENTATION_H_
#define FLUTTER_FLOW_INSTRUMENTATION_H_
#include <vector>
#include "flutter/fml/macros.h"
#include "flutter/fml/time/time_delta.h"
#include "flutter/fml/time/time_point.h"
#include "third_party/skia/include/core/SkCanvas.h"
namespace flutter {
class Stopwatch {
public:
Stopwatch(fml::Milliseconds frame_budget = fml::kDefaultFrameBudget);
~Stopwatch();
const fml::TimeDelta& LastLap() const;
fml::TimeDelta CurrentLap() const { return fml::TimePoint::Now() - start_; }
fml::TimeDelta MaxDelta() const;
fml::TimeDelta AverageDelta() const;
void InitVisualizeSurface(const SkRect& rect) const;
void Visualize(SkCanvas* canvas, const SkRect& rect) const;
void Start();
void Stop();
void SetLapTime(const fml::TimeDelta& delta);
private:
inline double UnitFrameInterval(double time_ms) const;
inline double UnitHeight(double time_ms, double max_height) const;
fml::TimePoint start_;
std::vector<fml::TimeDelta> laps_;
size_t current_sample_;
fml::Milliseconds frame_budget_;
// Mutable data cache for performance optimization of the graphs. Prevents
// expensive redrawing of old data.
mutable bool cache_dirty_;
mutable sk_sp<SkSurface> visualize_cache_surface_;
mutable size_t prev_drawn_sample_index_;
FML_DISALLOW_COPY_AND_ASSIGN(Stopwatch);
};
class Counter {
public:
Counter() : count_(0) {}
size_t count() const { return count_; }
void Reset(size_t count = 0) { count_ = count; }
void Increment(size_t count = 1) { count_ += count; }
private:
size_t count_;
FML_DISALLOW_COPY_AND_ASSIGN(Counter);
};
class CounterValues {
public:
CounterValues();
~CounterValues();
void Add(int64_t value);
void Visualize(SkCanvas* canvas, const SkRect& rect) const;
int64_t GetCurrentValue() const;
int64_t GetMaxValue() const;
int64_t GetMinValue() const;
private:
std::vector<int64_t> values_;
size_t current_sample_;
FML_DISALLOW_COPY_AND_ASSIGN(CounterValues);
};
} // namespace flutter
#endif // FLUTTER_FLOW_INSTRUMENTATION_H_