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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi (Trading) Limited
*
* geq.cpp - GEQ (green equalisation) control algorithm
*/
#include <libcamera/base/log.h>
#include "../device_status.h"
#include "../lux_status.h"
#include "../pwl.hpp"
#include "geq.hpp"
using namespace RPiController;
using namespace libcamera;
LOG_DEFINE_CATEGORY(RPiGeq)
// We use the lux status so that we can apply stronger settings in darkness (if
// necessary).
#define NAME "rpi.geq"
Geq::Geq(Controller *controller)
: Algorithm(controller)
{
}
char const *Geq::Name() const
{
return NAME;
}
void Geq::Read(boost::property_tree::ptree const ¶ms)
{
config_.offset = params.get<uint16_t>("offset", 0);
config_.slope = params.get<double>("slope", 0.0);
if (config_.slope < 0.0 || config_.slope >= 1.0)
throw std::runtime_error("Geq: bad slope value");
if (params.get_child_optional("strength"))
config_.strength.Read(params.get_child("strength"));
}
void Geq::Prepare(Metadata *image_metadata)
{
LuxStatus lux_status = {};
lux_status.lux = 400;
if (image_metadata->Get("lux.status", lux_status))
LOG(RPiGeq, Warning) << "no lux data found";
DeviceStatus device_status;
device_status.analogue_gain = 1.0; // in case not found
if (image_metadata->Get("device.status", device_status))
LOG(RPiGeq, Warning)
<< "no device metadata - use analogue gain of 1x";
GeqStatus geq_status = {};
double strength =
config_.strength.Empty()
? 1.0
: config_.strength.Eval(config_.strength.Domain().Clip(
lux_status.lux));
strength *= device_status.analogue_gain;
double offset = config_.offset * strength;
double slope = config_.slope * strength;
geq_status.offset = std::min(65535.0, std::max(0.0, offset));
geq_status.slope = std::min(.99999, std::max(0.0, slope));
LOG(RPiGeq, Debug)
<< "offset " << geq_status.offset << " slope "
<< geq_status.slope << " (analogue gain "
<< device_status.analogue_gain << " lux "
<< lux_status.lux << ")";
image_metadata->Set("geq.status", geq_status);
}
// Register algorithm with the system.
static Algorithm *Create(Controller *controller)
{
return (Algorithm *)new Geq(controller);
}
static RegisterAlgorithm reg(NAME, &Create);
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