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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021-2022, Ideas On Board
*
* gsl.cpp - RkISP1 Gamma Sensor Linearization control
*/
#include "gsl.h"
#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>
#include "libcamera/internal/yaml_parser.h"
#include "linux/rkisp1-config.h"
/**
* \file gsl.h
*/
namespace libcamera {
namespace ipa::rkisp1::algorithms {
/**
* \class GammaSensorLinearization
* \brief RkISP1 Gamma Sensor Linearization control
*
* This algorithm linearizes the sensor output to compensate the sensor
* non-linearities by applying piecewise linear functions to the red, green and
* blue channels.
*
* The curves are specified in the tuning data and defined using 17 points.
*
* - The X coordinates are expressed using 16 intervals, with the first point
* at X coordinate 0. Each interval is expressed as a 2-bit value DX (from
* GAMMA_DX_1 to GAMMA_DX_16), stored in the RKISP1_CIF_ISP_GAMMA_DX_LO and
* RKISP1_CIF_ISP_GAMMA_DX_HI registers. The real interval is equal to
* \f$2^{dx+4}\f$. X coordinates are shared between the red, green and blue
* curves.
*
* - The Y coordinates are specified as 17 values separately for the
* red, green and blue channels, with a 12-bit resolution. Each value must be
* in the [-2048, 2047] range compared to the previous value.
*/
LOG_DEFINE_CATEGORY(RkISP1Gsl)
static constexpr unsigned int kDegammaXIntervals = 16;
GammaSensorLinearization::GammaSensorLinearization()
: initialized_(false)
{
}
/**
* \copydoc libcamera::ipa::Algorithm::init
*/
int GammaSensorLinearization::init([[maybe_unused]] IPAContext &context,
const YamlObject &tuningData)
{
std::vector<uint16_t> xIntervals =
tuningData["x-intervals"].getList<uint16_t>().value_or(utils::defopt);
if (xIntervals.size() != kDegammaXIntervals) {
LOG(RkISP1Gsl, Error)
<< "Invalid 'x' coordinates: expected "
<< kDegammaXIntervals << " elements, got "
<< xIntervals.size();
return -EINVAL;
}
/* Compute gammaDx_ intervals from xIntervals values */
gammaDx_[0] = 0;
gammaDx_[1] = 0;
for (unsigned int i = 0; i < kDegammaXIntervals; ++i)
gammaDx_[i / 8] |= (xIntervals[i] & 0x07) << ((i % 8) * 4);
const YamlObject &yObject = tuningData["y"];
if (!yObject.isDictionary()) {
LOG(RkISP1Gsl, Error)
<< "Issue while parsing 'y' in tuning file: "
<< "entry must be a dictionary";
return -EINVAL;
}
curveYr_ = yObject["red"].getList<uint16_t>().value_or(utils::defopt);
if (curveYr_.size() != RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE) {
LOG(RkISP1Gsl, Error)
<< "Invalid 'y:red' coordinates: expected "
<< RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE
<< " elements, got " << curveYr_.size();
return -EINVAL;
}
curveYg_ = yObject["green"].getList<uint16_t>().value_or(utils::defopt);
if (curveYg_.size() != RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE) {
LOG(RkISP1Gsl, Error)
<< "Invalid 'y:green' coordinates: expected "
<< RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE
<< " elements, got " << curveYg_.size();
return -EINVAL;
}
curveYb_ = yObject["blue"].getList<uint16_t>().value_or(utils::defopt);
if (curveYb_.size() != RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE) {
LOG(RkISP1Gsl, Error)
<< "Invalid 'y:blue' coordinates: expected "
<< RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE
<< " elements, got " << curveYb_.size();
return -EINVAL;
}
initialized_ = true;
return 0;
}
/**
* \copydoc libcamera::ipa::Algorithm::prepare
*/
void GammaSensorLinearization::prepare(IPAContext &context,
[[maybe_unused]] const uint32_t frame,
[[maybe_unused]] IPAFrameContext &frameContext,
rkisp1_params_cfg *params)
{
if (context.activeState.frameCount > 0)
return;
if (!initialized_)
return;
params->others.sdg_config.xa_pnts.gamma_dx0 = gammaDx_[0];
params->others.sdg_config.xa_pnts.gamma_dx1 = gammaDx_[1];
std::copy(curveYr_.begin(), curveYr_.end(),
params->others.sdg_config.curve_r.gamma_y);
std::copy(curveYg_.begin(), curveYg_.end(),
params->others.sdg_config.curve_g.gamma_y);
std::copy(curveYb_.begin(), curveYb_.end(),
params->others.sdg_config.curve_b.gamma_y);
params->module_en_update |= RKISP1_CIF_ISP_MODULE_SDG;
params->module_ens |= RKISP1_CIF_ISP_MODULE_SDG;
params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_SDG;
}
REGISTER_IPA_ALGORITHM(GammaSensorLinearization, "GammaSensorLinearization")
} /* namespace ipa::rkisp1::algorithms */
} /* namespace libcamera */
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