ipa: rkisp1: Add support of Gamma Sensor Linearization control

The GammaSensorLinearization algorithm linearizes the sensor output to
compensate the sensor non-linearities by applying piecewise linear
functions to the red, green and blue channels.

Signed-off-by: Florian Sylvestre <fsylvestre@baylibre.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/algorithms/gsl.h b/src/ipa/rkisp1/algorithms/gsl.h
new file mode 100644
index 00000000..db287dc2
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/gsl.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021-2022, Ideas On Board
+ *
+ * gsl.h - RkISP1 Gamma Sensor Linearization control
+ */
+
+#pragma once
+
+#include "algorithm.h"
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+class GammaSensorLinearization : public Algorithm
+{
+public:
+	GammaSensorLinearization();
+	~GammaSensorLinearization() = default;
+
+	int init(IPAContext &context, const YamlObject &tuningData) override;
+	void prepare(IPAContext &context, rkisp1_params_cfg *params) override;
+
+private:
+	bool initialized_;
+	uint32_t gammaDx_[2];
+	std::vector<uint16_t> curveYr_;
+	std::vector<uint16_t> curveYg_;
+	std::vector<uint16_t> curveYb_;
+};
+
+} /* namespace ipa::rkisp1::algorithms */
+} /* namespace libcamera */