sensor_cfa_layout.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2026 Frederic Laing
 */
 
#pragma once
 
#include <algorithm>
#include <string_view>
 
#include <libcamera/geometry.h>
 
namespace libcamera {
 
struct SensorCfaLayout {
    Size nativeCellSize;
    Size softwareIspInputCellSize;
 
    unsigned int minimumDebinFactor() const
    {
        return 2 * std::max(nativeCellSize.width, nativeCellSize.height);
    }
 
    bool softwareIspNeedsCellCollapse() const
    {
        return softwareIspInputCellSize != Size(1, 1);
    }
};
 
inline SensorCfaLayout sensorCfaLayout(std::string_view model)
{
    /*
     * Native cell size describes the sensor construction. The software ISP
     * input size separately describes whether that pipeline receives physical
     * same-colour cells or an ordinary Bayer stream produced by the sensor.
     */
    if (model == "imx371")
        return { { 2, 2 }, { 2, 2 } };
    if (model == "imx708" || model == "imx708_wide" ||
        model == "imx708_noir" || model == "imx708_wide_noir")
        return { { 2, 2 }, { 1, 1 } };
 
    return { { 1, 1 }, { 1, 1 } };
}
 
} /* namespace libcamera */