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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2024, Ideas On Board
*
* RkISP1 Gamma out control
*/
#include "goc.h"
#include <cmath>
#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>
#include <libcamera/control_ids.h>
#include "libcamera/internal/yaml_parser.h"
#include "linux/rkisp1-config.h"
/**
* \file goc.h
*/
namespace libcamera {
namespace ipa::rkisp1::algorithms {
/**
* \class GammaOutCorrection
* \brief RkISP1 Gamma out correction
*
* This algorithm implements the gamma out curve for the RkISP1. It defaults to
* a gamma value of 2.2.
*
* As gamma is internally represented as a piecewise linear function with only
* 17 knots, the difference between gamma=2.2 and sRGB gamma is minimal.
* Therefore sRGB gamma was not implemented as special case.
*
* Useful links:
* - https://www.cambridgeincolour.com/tutorials/gamma-correction.htm
* - https://en.wikipedia.org/wiki/SRGB
*/
LOG_DEFINE_CATEGORY(RkISP1Gamma)
const float kDefaultGamma = 2.2f;
/**
* \copydoc libcamera::ipa::Algorithm::init
*/
int GammaOutCorrection::init(IPAContext &context, const YamlObject &tuningData)
{
if (context.hw->numGammaOutSamples !=
RKISP1_CIF_ISP_GAMMA_OUT_MAX_SAMPLES_V10) {
LOG(RkISP1Gamma, Error)
<< "Gamma is not implemented for RkISP1 V12";
return -EINVAL;
}
defaultGamma_ = tuningData["gamma"].get<double>(kDefaultGamma);
context.ctrlMap[&controls::Gamma] = ControlInfo(0.1f, 10.0f, defaultGamma_);
return 0;
}
/**
* \copydoc libcamera::ipa::Algorithm::configure
*/
int GammaOutCorrection::configure(IPAContext &context,
[[maybe_unused]] const IPACameraSensorInfo &configInfo)
{
context.activeState.goc.gamma = defaultGamma_;
return 0;
}
/**
* \copydoc libcamera::ipa::Algorithm::queueRequest
*/
void GammaOutCorrection::queueRequest(IPAContext &context, const uint32_t frame,
IPAFrameContext &frameContext,
const ControlList &controls)
{
if (frame == 0)
frameContext.goc.update = true;
const auto &gamma = controls.get(controls::Gamma);
if (gamma) {
context.activeState.goc.gamma = *gamma;
frameContext.goc.update = true;
LOG(RkISP1Gamma, Debug) << "Set gamma to " << *gamma;
}
frameContext.goc.gamma = context.activeState.goc.gamma;
}
/**
* \copydoc libcamera::ipa::Algorithm::prepare
*/
void GammaOutCorrection::prepare(IPAContext &context,
[[maybe_unused]] const uint32_t frame,
IPAFrameContext &frameContext,
rkisp1_params_cfg *params)
{
ASSERT(context.hw->numGammaOutSamples ==
RKISP1_CIF_ISP_GAMMA_OUT_MAX_SAMPLES_V10);
/*
* The logarithmic segments as specified in the reference.
* Plus an additional 0 to make the loop easier
*/
static constexpr std::array<unsigned int, RKISP1_CIF_ISP_GAMMA_OUT_MAX_SAMPLES_V10> segments = {
64, 64, 64, 64, 128, 128, 128, 128, 256,
256, 256, 512, 512, 512, 512, 512, 0
};
__u16 *gamma_y = params->others.goc_config.gamma_y;
if (!frameContext.goc.update)
return;
unsigned x = 0;
for (const auto [i, size] : utils::enumerate(segments)) {
gamma_y[i] = std::pow(x / 4096.0, 1.0 / frameContext.goc.gamma) * 1023.0;
x += size;
}
params->others.goc_config.mode = RKISP1_CIF_ISP_GOC_MODE_LOGARITHMIC;
params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_GOC;
params->module_en_update |= RKISP1_CIF_ISP_MODULE_GOC;
params->module_ens |= RKISP1_CIF_ISP_MODULE_GOC;
}
/**
* \copydoc libcamera::ipa::Algorithm::process
*/
void GammaOutCorrection::process([[maybe_unused]] IPAContext &context,
[[maybe_unused]] const uint32_t frame,
IPAFrameContext &frameContext,
[[maybe_unused]] const rkisp1_stat_buffer *stats,
ControlList &metadata)
{
metadata.set(controls::Gamma, frameContext.goc.gamma);
}
REGISTER_IPA_ALGORITHM(GammaOutCorrection, "GammaOutCorrection")
} /* namespace ipa::rkisp1::algorithms */
} /* namespace libcamera */
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