ipa: rkisp1: Add support of Lens Shading Correction control

The Lens Shading Correction algorithm applies multipliers to all pixels
to compensate for the lens shading effect. The coefficients are
specified in a downscaled table in the YAML tuning file.

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

1 files changed, 38 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/algorithms/lsc.h b/src/ipa/rkisp1/algorithms/lsc.h
new file mode 100644
index 00000000..fdb2ec1d
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/lsc.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021-2022, Ideas On Board
+ *
+ * lsc.h - RkISP1 Lens Shading Correction control
+ */
+
+#pragma once
+
+#include "algorithm.h"
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+class LensShadingCorrection : public Algorithm
+{
+public:
+	LensShadingCorrection();
+	~LensShadingCorrection() = default;
+
+	int init(IPAContext &context, const YamlObject &tuningData) override;
+	void prepare(IPAContext &context, rkisp1_params_cfg *params) override;
+
+private:
+	bool initialized_;
+
+	std::vector<uint16_t> rData_;
+	std::vector<uint16_t> grData_;
+	std::vector<uint16_t> gbData_;
+	std::vector<uint16_t> bData_;
+
+	std::vector<double> xSize_;
+	std::vector<double> ySize_;
+};
+
+} /* namespace ipa::rkisp1::algorithms */
+} /* namespace libcamera */