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/* Copyright (c) 2013 Patrick Ruoff
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#ifndef FRAME_OBSERVER_H
#define FRAME_OBSERVER_H
#include <QMutex>
#include <opencv2/opencv.hpp>
#include <boost/shared_ptr.hpp>
#include <set>
//-----------------------------------------------------------------------------
// Forward declarations
class FrameObserver;
//-----------------------------------------------------------------------------
// Provides means to copy frame and point information if it has observers
// Instantiate a FrameObserver to get the information
class FrameProvider
{
friend class FrameObserver;
public:
~FrameProvider();
protected:
virtual bool get_frame_and_points(cv::Mat& frame, boost::shared_ptr< std::vector<cv::Vec2f> >& points) = 0;
bool has_observers() const { QMutexLocker lock(&observer_mutex); return !frame_observers.empty(); }
private:
mutable QMutex observer_mutex;
void add_observer(FrameObserver* obs) { QMutexLocker lock(&observer_mutex); frame_observers.insert(obs); }
void remove_observer(FrameObserver* obs) { QMutexLocker lock(&observer_mutex); frame_observers.erase(obs); }
std::set<FrameObserver*> frame_observers;
};
//-----------------------------------------------------------------------------
// Used to get frame and point information from MutexedFrameProvider
// Destroy instance if not interested anymore since a living
// FrameObserver instance causes MutexedFrameProvider to provide the information,
// potentially reducing its performance
class FrameObserver
{
public:
FrameObserver(FrameProvider* provider) : provider(provider) {
provider->add_observer(this);
}
~FrameObserver() {
if (provider) provider->remove_observer(this);
}
bool get_frame_and_points(cv::Mat& frame, boost::shared_ptr< std::vector<cv::Vec2f> >& points) {
return provider ? provider->get_frame_and_points(frame, points) : false;
}
void on_frame_provider_destroy() {
provider = NULL;
}
protected:
FrameProvider* provider;
private:
FrameObserver(const FrameObserver&);
};
#endif //FRAME_OBSERVER_H
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