exposure_mode_helper.h

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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 */