debayer_params.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2023-2025 Red Hat Inc.
 *
 * Authors:
 * Hans de Goede <hdegoede@redhat.com>
 *
 * DebayerParams header
 */

#pragma once

#include <array>
#include <stdint.h>

namespace libcamera {

struct DebayerParams {
    static constexpr unsigned int kRGBLookupSize = 256;

    struct CcmColumn {
        int16_t r;
        int16_t g;
        int16_t b;
    };

    using LookupTable = std::array<uint8_t, kRGBLookupSize>;
    using CcmLookupTable = std::array<CcmColumn, kRGBLookupSize>;

    /*
     * Color lookup tables when CCM is not used.
     *
     * Each color of a debayered pixel is amended by the corresponding
     * value in the given table.
     */
    LookupTable red;
    LookupTable green;
    LookupTable blue;

    /*
     * Color and gamma lookup tables when CCM is used.
     *
     * Each of the CcmLookupTable's corresponds to a CCM column; together they
     * make a complete 3x3 CCM lookup table. The CCM is applied on debayered
     * pixels and then the gamma lookup table is used to set the resulting
     * values of all the three colors.
     */
    CcmLookupTable redCcm;
    CcmLookupTable greenCcm;
    CcmLookupTable blueCcm;
    LookupTable gammaLut;
};

} /* namespace libcamera */