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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2024, Paul Elder <paul.elder@ideasonboard.com>
*
* Helper class that performs computations relating to exposure
*/
#pragma once
#include <tuple>
#include <utility>
#include <vector>
#include <libcamera/base/span.h>
#include <libcamera/base/utils.h>
namespace libcamera {
namespace ipa {
class ExposureModeHelper
{
public:
ExposureModeHelper(const Span<std::pair<utils::Duration, double>> stages);
~ExposureModeHelper() = default;
void setLimits(utils::Duration minExposureTime, utils::Duration maxExposureTime,
double minGain, double maxGain);
std::tuple<utils::Duration, double, double>
splitExposure(utils::Duration exposure) const;
utils::Duration minExposureTime() const { return minExposureTime_; }
utils::Duration maxExposureTime() const { return maxExposureTime_; }
double minGain() const { return minGain_; }
double maxGain() const { return maxGain_; }
private:
utils::Duration clampExposureTime(utils::Duration exposureTime) const;
double clampGain(double gain) const;
std::vector<utils::Duration> exposureTimes_;
std::vector<double> gains_;
utils::Duration minExposureTime_;
utils::Duration maxExposureTime_;
double minGain_;
double maxGain_;
};
} /* namespace ipa */
} /* namespace libcamera */
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