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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Google Inc.
*
* camera_sensor_helper.h - Helper class that performs sensor-specific parameter computations
*/
#pragma once
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include <libcamera/base/class.h>
namespace libcamera {
namespace ipa {
class CameraSensorHelper
{
public:
CameraSensorHelper() = default;
virtual ~CameraSensorHelper() = default;
virtual uint32_t gainCode(double gain) const;
virtual double gain(uint32_t gainCode) const;
protected:
enum AnalogueGainType {
AnalogueGainLinear,
AnalogueGainExponential,
};
struct AnalogueGainLinearConstants {
int16_t m0;
int16_t c0;
int16_t m1;
int16_t c1;
};
struct AnalogueGainExpConstants {
double a;
double m;
};
union AnalogueGainConstants {
AnalogueGainLinearConstants linear;
AnalogueGainExpConstants exp;
};
AnalogueGainType gainType_;
AnalogueGainConstants gainConstants_;
private:
LIBCAMERA_DISABLE_COPY_AND_MOVE(CameraSensorHelper)
};
class CameraSensorHelperFactoryBase
{
public:
CameraSensorHelperFactoryBase(const std::string name);
virtual ~CameraSensorHelperFactoryBase() = default;
static std::unique_ptr<CameraSensorHelper> create(const std::string &name);
static std::vector<CameraSensorHelperFactoryBase *> &factories();
private:
LIBCAMERA_DISABLE_COPY_AND_MOVE(CameraSensorHelperFactoryBase)
static void registerType(CameraSensorHelperFactoryBase *factory);
virtual std::unique_ptr<CameraSensorHelper> createInstance() const = 0;
std::string name_;
};
template<typename _Helper>
class CameraSensorHelperFactory final : public CameraSensorHelperFactoryBase
{
public:
CameraSensorHelperFactory(const char *name)
: CameraSensorHelperFactoryBase(name)
{
}
private:
std::unique_ptr<CameraSensorHelper> createInstance() const override
{
return std::make_unique<_Helper>();
}
};
#define REGISTER_CAMERA_SENSOR_HELPER(name, helper) \
static CameraSensorHelperFactory<helper> global_##helper##Factory(name);
} /* namespace ipa */
} /* namespace libcamera */
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