agc_msv.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2024, Red Hat Inc.
 *
 * Luminance mean sample value based AGC algorithm
 */
 
#pragma once
 
#include <array>
#include <stdint.h>
 
namespace libcamera {
 
namespace ipa {
 
class Histogram;
 
class AgcMSV
{
public:
    struct Limits {
        std::array<uint32_t, 2> exposure;
        std::array<double, 2> gain;
        double gainMinStep;
        double gain1;
    };
 
    struct Params {
        const Histogram &yHist;
        uint32_t exposure;
        double gain;
    };
 
    struct Result {
        uint32_t exposure;
        double analogueGain;
    };
 
    void setLimits(const Limits &limits);
    [[nodiscard]] Result calculateNewEv(const Params &params);
 
private:
    AgcMSV::Result updateExposure(uint32_t exposure, double again, float exposureMSV);
 
    Limits limits_ = {};
};
 
} /* namespace ipa */
 
} /* namespace libcamera */