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      1 /*
      2 * Copyright 2017 Google Inc.
      3 *
      4 * Use of this source code is governed by a BSD-style license that can be
      5 * found in the LICENSE file.
      6 */
      7 
      8 #ifndef StatsLayer_DEFINED
      9 #define StatsLayer_DEFINED
     10 
     11 #include "SkColor.h"
     12 #include "SkString.h"
     13 #include "sk_app/Window.h"
     14 
     15 class StatsLayer : public sk_app::Window::Layer {
     16 public:
     17     StatsLayer();
     18     void resetMeasurements();
     19 
     20     typedef int Timer;
     21 
     22     Timer addTimer(const char* label, SkColor color, SkColor labelColor = 0);
     23     void beginTiming(Timer);
     24     void endTiming(Timer);
     25     double getLastTime(Timer);
     26 
     27     void onPaint(SkCanvas* canvas) override;
     28 
     29 private:
     30     static const int kMeasurementCount = 1 << 6;  // should be power of 2 for fast mod
     31     struct TimerData {
     32         double fTimes[kMeasurementCount];
     33         SkString fLabel;
     34         SkColor fColor;
     35         SkColor fLabelColor;
     36     };
     37     SkTArray<TimerData> fTimers;
     38     int fCurrentMeasurement;
     39     double fCumulativeMeasurementTime;
     40     int fCumulativeMeasurementCount;
     41 };
     42 
     43 #endif
     44