hyperion.ng/libsrc/hyperion/LinearColorSmoothing.cpp

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// Qt includes
#include <QDateTime>
#include "LinearColorSmoothing.h"
LinearColorSmoothing::LinearColorSmoothing(
LedDevice * ledDevice,
double ledUpdateFrequency_hz,
int settlingTime_ms,
unsigned updateDelay) :
QObject(),
LedDevice(),
_ledDevice(ledDevice),
_updateInterval(1000 / ledUpdateFrequency_hz),
_settlingTime(settlingTime_ms),
_timer(),
_outputDelay(updateDelay),
_writeToLedsEnable(true)
{
_timer.setSingleShot(false);
_timer.setInterval(_updateInterval);
connect(&_timer, SIGNAL(timeout()), this, SLOT(updateLeds()));
std::cout << "HYPERION (CS) INFO: Created linear-smoothing(interval_ms=" << _updateInterval << ";settlingTime_ms=" << settlingTime_ms << ";updateDelay=" << _outputDelay << std::endl;
}
LinearColorSmoothing::~LinearColorSmoothing()
{
// Make sure to switch off the underlying led-device (because switchOff is no longer forwarded)
_ledDevice->switchOff();
delete _ledDevice;
}
int LinearColorSmoothing::write(const std::vector<ColorRgb> &ledValues)
{
// received a new target color
if (_previousValues.empty())
{
// not initialized yet
_targetTime = QDateTime::currentMSecsSinceEpoch() + _settlingTime;
_targetValues = ledValues;
_previousTime = QDateTime::currentMSecsSinceEpoch();
_previousValues = ledValues;
_timer.start();
}
else
{
_targetTime = QDateTime::currentMSecsSinceEpoch() + _settlingTime;
memcpy(_targetValues.data(), ledValues.data(), ledValues.size() * sizeof(ColorRgb));
}
return 0;
}
int LinearColorSmoothing::switchOff()
{
// We will keep updating the leds (but with pure-black)
// Clear the smoothing parameters
std::fill(_targetValues.begin(), _targetValues.end(), ColorRgb::BLACK);
_targetTime = 0;
// Erase the output-queue
for (unsigned i=0; i<_outputQueue.size(); ++i)
{
_outputQueue.push_back(_targetValues);
_outputQueue.pop_front();
}
return 0;
}
void LinearColorSmoothing::updateLeds()
{
int64_t now = QDateTime::currentMSecsSinceEpoch();
int deltaTime = _targetTime - now;
if (deltaTime < 0)
{
memcpy(_previousValues.data(), _targetValues.data(), _targetValues.size() * sizeof(ColorRgb));
_previousTime = now;
queueColors(_previousValues);
_writeToLedsEnable = false;
}
else
{
_writeToLedsEnable = true;
float k = 1.0f - 1.0f * deltaTime / (_targetTime - _previousTime);
for (size_t i = 0; i < _previousValues.size(); ++i)
{
ColorRgb & prev = _previousValues[i];
ColorRgb & target = _targetValues[i];
prev.red += k * (target.red - prev.red);
prev.green += k * (target.green - prev.green);
prev.blue += k * (target.blue - prev.blue);
}
_previousTime = now;
queueColors(_previousValues);
}
}
void LinearColorSmoothing::queueColors(const std::vector<ColorRgb> & ledColors)
{
if (_outputDelay == 0)
{
// No output delay => immediate write
if ( _writeToLedsEnable )
_ledDevice->write(ledColors);
}
else
{
// Push the new colors in the delay-buffer
_outputQueue.push_back(ledColors);
// If the delay-buffer is filled pop the front and write to device
if (_outputQueue.size() > _outputDelay)
{
if ( _writeToLedsEnable )
_ledDevice->write(_outputQueue.front());
_outputQueue.pop_front();
}
}
}