1 files changed, 94 insertions, 0 deletions
diff --git a/src/ipa/libipa/camera_sensor_helper.h b/src/ipa/libipa/camera_sensor_helper.h
new file mode 100644
index 00000000..a9300a64
--- /dev/null
+++ b/src/ipa/libipa/camera_sensor_helper.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * Helper class that performs sensor-specific parameter computations
+ */
+
+#pragma once
+
+#include <memory>
+#include <optional>
+#include <stdint.h>
+#include <string>
+#include <variant>
+#include <vector>
+
+#include <libcamera/base/class.h>
+
+namespace libcamera {
+
+namespace ipa {
+
+class CameraSensorHelper
+{
+public:
+	CameraSensorHelper() = default;
+	virtual ~CameraSensorHelper() = default;
+
+	std::optional<int16_t> blackLevel() const { return blackLevel_; }
+	virtual uint32_t gainCode(double gain) const;
+	virtual double gain(uint32_t gainCode) const;
+
+protected:
+	struct AnalogueGainLinear {
+		int16_t m0;
+		int16_t c0;
+		int16_t m1;
+		int16_t c1;
+	};
+
+	struct AnalogueGainExp {
+		double a;
+		double m;
+	};
+
+	std::optional<int16_t> blackLevel_;
+	std::variant<std::monostate, AnalogueGainLinear, AnalogueGainExp> gain_;
+
+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 */