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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2024 Ideas on Board Oy
*
* Generic AWB algorithms
*/
#include "awb.h"
#include <libcamera/base/log.h>
/**
* \file awb.h
* \brief Base classes for AWB algorithms
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(Awb)
namespace ipa {
/**
* \class AwbResult
* \brief The result of an awb calculation
*
* This class holds the result of an auto white balance calculation.
*/
/**
* \var AwbResult::gains
* \brief The calculated white balance gains
*/
/**
* \var AwbResult::colourTemperature
* \brief The calculated colour temperature in Kelvin
*/
/**
* \class AwbStats
* \brief An abstraction class wrapping hardware-specific AWB statistics
*
* Pipeline handlers using an AWB algorithm based on the AwbAlgorithm class need
* to implement this class to give the algorithm access to the hardware-specific
* statistics data.
*/
/**
* \fn AwbStats::computeColourError
* \brief Compute an error value for when the given gains would be applied
* \param[in] gains The gains to apply
*
* Compute an error value (non-greyness) assuming the given \a gains would be
* applied. To keep the actual implementations computationally inexpensive,
* the squared colour error shall be returned.
*
* If the awb statistics provide multiple zones, the sum over all zones needs to
* calculated.
*
* \return The computed error value
*/
/**
* \fn AwbStats::getRGBMeans
* \brief Get RGB means of the statistics
*
* Fetch the RGB means from the statistics. The values of each channel are
* dimensionless and only the ratios are used for further calculations. This is
* used by the simple gray world model to calculate the gains to apply.
*
* \return The RGB means
*/
/**
* \class AwbAlgorithm
* \brief A base class for auto white balance algorithms
*
* This class is a base class for auto white balance algorithms. It defines an
* interface for the algorithms to implement, and is used by the IPAs to
* interact with the concrete implementation.
*/
/**
* \fn AwbAlgorithm::init
* \brief Initialize the algorithm with the given tuning data
* \param[in] tuningData The tuning data to use for the algorithm
*
* \return 0 on success, a negative error code otherwise
*/
/**
* \fn AwbAlgorithm::calculateAwb
* \brief Calculate awb data from the given statistics
* \param[in] stats The statistics to use for the calculation
* \param[in] lux The lux value of the scene
*
* Calculate an AwbResult object from the given statistics and lux value. A \a
* lux value of 0 means it is unknown or invalid and the algorithm shall ignore
* it.
*
* \return The awb result
*/
/**
* \fn AwbAlgorithm::gainsFromColourTemperature
* \brief Compute white balance gains from a colour temperature
* \param[in] colourTemperature The colour temperature in Kelvin
*
* Compute the white balance gains from a \a colourTemperature. This function
* does not take any statistics into account. It is used to compute the colour
* gains when the user manually specifies a colour temperature.
*
* \return The colour gains
*/
/**
* \fn AwbAlgorithm::controls
* \brief Get the controls info map for this algorithm
*
* \return The controls info map
*/
/**
* \fn AwbAlgorithm::handleControls
* \param[in] controls The controls to handle
* \brief Handle the controls supplied in a request
*/
/**
* \var AwbAlgorithm::controls_
* \brief Controls info map for the controls provided by the algorithm
*/
} /* namespace ipa */
} /* namespace libcamera */
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