frame_tracker.h

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#pragma once
 
#include <stdint.h>
 
#include "fl/namespace.h"
 
// #include <iostream>
 
// using namespace std;
 
namespace fl {
 
// Tracks the current frame number based on the time elapsed since the start of
// the animation.
class FrameTracker {
  public:
    FrameTracker(float fps);
 
    // Gets the current frame and the next frame number based on the current
    // time.
    void get_interval_frames(uint32_t now, uint32_t *frameNumber,
                             uint32_t *nextFrameNumber,
                             uint8_t *amountOfNextFrame = nullptr) const;
 
    // Given a frame number, returns the exact timestamp in milliseconds that
    // the frame should be displayed.
    uint32_t get_exact_timestamp_ms(uint32_t frameNumber) const;
 
    uint32_t microsecondsPerFrame() const { return mMicrosSecondsPerInterval; }
 
  private:
    uint32_t mMicrosSecondsPerInterval;
    uint32_t mStartTime = 0;
};
 
} // namespace fl