Repo created

libs/drape_frontend/gui/scale_fps_helper.hpp

@@ -0,0 +1,53 @@
+#pragma once
+
+#include "base/timer.hpp"
+
+#include <cstdint>
+
+namespace gui
+{
+class ScaleFpsHelper
+{
+public:
+  uint32_t GetFps() const
+  {
+    if (m_frameTime == 0.0)
+      return 0;
+    return static_cast<uint32_t>(1.0 / m_frameTime);
+  }
+
+  bool IsPaused() const { return m_isPaused; }
+
+  void SetFrameTime(double frameTime, bool isActiveFrame)
+  {
+    m_isPaused = !isActiveFrame;
+    m_framesCounter++;
+    m_aggregatedFrameTime += frameTime;
+
+    double constexpr kAggregationPeriod = 0.5;
+    if (m_isPaused || m_fpsAggregationTimer.ElapsedSeconds() >= kAggregationPeriod)
+    {
+      m_frameTime = m_aggregatedFrameTime / m_framesCounter;
+      m_aggregatedFrameTime = 0.0;
+      m_framesCounter = 0;
+      m_fpsAggregationTimer.Reset();
+    }
+  }
+
+  int GetScale() const { return m_scale; }
+  void SetScale(int scale) { m_scale = scale; }
+
+  void SetVisible(bool isVisible) { m_isVisible = isVisible; }
+  bool IsVisible() const { return m_isVisible; }
+
+private:
+  double m_frameTime = 0.0;
+  int m_scale = 1;
+  bool m_isVisible = false;
+
+  base::Timer m_fpsAggregationTimer;
+  double m_aggregatedFrameTime = 0.0;
+  uint32_t m_framesCounter = 1;
+  bool m_isPaused = false;
+};
+}  // namespace gui