Source repositorykms_plane.h

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#pragma once
 
// standard includes
#include <chrono>
#include <optional>
 
namespace platf::kms {
  class empty_plane_timer_t {
  public:
    explicit empty_plane_timer_t(std::chrono::steady_clock::duration delay):
        delay_ {delay} {
    }

    bool update(bool has_fb, std::chrono::steady_clock::time_point now) {
      if (has_fb) {
        empty_since_.reset();
        return false;
      }
      if (!empty_since_) {
        empty_since_ = now;
      }
      return now - *empty_since_ >= delay_;
    }

    std::chrono::steady_clock::duration empty_for(std::chrono::steady_clock::time_point now) const {
      return empty_since_ ? now - *empty_since_ : std::chrono::steady_clock::duration::zero();
    }
 
  private:
    std::chrono::steady_clock::duration delay_;  
    std::optional<std::chrono::steady_clock::time_point> empty_since_;  
  };
}  // namespace platf::kms