hyperion.ng/libsrc/hyperion/LinearColorSmoothing.h

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#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;
};