debayer_params.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2023-2026 Red Hat Inc.
 *
 * Authors:
 * Hans de Goede <hdegoede@redhat.com>
 *
 * DebayerParams header
 */
 
#pragma once
 
#include <array>
#include <stdint.h>
 
#include "libcamera/internal/matrix.h"
#include "libcamera/internal/vector.h"
 
namespace libcamera {
 
struct DebayerParams {
    Matrix<float, 3, 3> combinedMatrix = { { 1.0, 0.0, 0.0,
                         0.0, 1.0, 0.0,
                         0.0, 0.0, 1.0 } };
    RGB<double> blackLevel = RGB<double>({ 0.0, 0.0, 0.0 });
    float gamma = 1.0;
    float contrastExp = 1.0;
    RGB<double> gains = RGB<double>({ 1.0, 1.0, 1.0 });
 
    static constexpr unsigned int kLscGridSize = 17;
    static constexpr unsigned int kLscValuesPerCell = 4;
    static constexpr unsigned int kLscBytesPerCell =
        kLscValuesPerCell * sizeof(uint8_t);
    using LscLookupTable =
        std::array<uint8_t, kLscGridSize * kLscGridSize * kLscValuesPerCell>;
    static constexpr auto identityLscLut = [] {
        LscLookupTable lut = {};
        /* lut.fill(64) could be used, but it fails with older gcc versions */
        for (size_t i = 0; kLscValuesPerCell * i < lut.size(); i++) {
            lut[i * kLscValuesPerCell + 0] = 64; /* == UQ<2, 6>(1.0f).quantized() */
            lut[i * kLscValuesPerCell + 1] = 64;
            lut[i * kLscValuesPerCell + 2] = 64;
        }
        return lut;
    }();
    alignas(4) LscLookupTable lscLut = identityLscLut;
    uint64_t lscLutVersion = 0;
};
 
} /* namespace libcamera */