hyperion.ng/libsrc/hyperion/LinearColorSmoothing.h

#pragma once

// STL includes
#include <string>
#include <vector>

// Qt includes
#include <QTimer>

// hyperion incluse
#include <leddevice/LedDevice.h>

/// Linear Smooting class
///
/// This class processes the requested led values and forwards them to the device after applying
/// a linear smoothing effect. This class can be handled as a generic LedDevice.
class LinearColorSmoothing : public QObject, public LedDevice
{
	Q_OBJECT

public:
	/// Constructor
	/// @param LedDevice the led device
	/// @param LedUpdatFrequency The frequency at which the leds will be updated (Hz)
	/// @param settingTime The time after which the updated led values have been fully applied (sec)
	/// @param updateDelay The number of frames to delay outgoing led updates
	LinearColorSmoothing(LedDevice *ledDevice, double ledUpdateFrequency, int settlingTime, unsigned updateDelay);

	/// Destructor
	virtual ~LinearColorSmoothing();

	/// write updated values as input for the smoothing filter
	///
	/// @param ledValues The color-value per led
	/// @return Zero on succes else negative
	///
	virtual int write(const std::vector<ColorRgb> &ledValues);

	/// Switch the leds off
	virtual int switchOff();

private slots:
	/// Timer callback which writes updated led values to the led device
	void updateLeds();

private:
	/**
	 * Pushes the colors into the output queue and popping the head to the led-device
	 *
	 * @param ledColors The colors to queue
	 */
	void queueColors(const std::vector<ColorRgb> & ledColors);

	/// The led device
	LedDevice * _ledDevice;

	/// The interval at which to update the leds (msec)
	const int64_t _updateInterval;

	/// The time after which the updated led values have been fully applied (msec)
	const int64_t _settlingTime;

	/// The Qt timer object
	QTimer _timer;

	/// The timestamp at which the target data should be fully applied
	int64_t _targetTime;

	/// The target led data
	std::vector<ColorRgb> _targetValues;

	/// The timestamp of the previously written led data
	int64_t _previousTime;

	/// The previously written led data
	std::vector<ColorRgb> _previousValues;

	/** The number of updates to keep in the output queue (delayed) before being output */
	const unsigned _outputDelay;
	/** The output queue */
	std::list<std::vector<ColorRgb> > _outputQueue;

	// prevent sending data to device when no intput data is sent
	bool _writeToLedsEnable;
};