libcamera: ipa: Raspberry Pi IPA

Initial implementation of the Raspberry Pi (BCM2835) libcamera IPA and
associated libraries.

All code is licensed under the BSD-2-Clause terms.
Copyright (c) 2019-2020 Raspberry Pi Trading Ltd.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/rpi/ccm.hpp b/src/ipa/raspberrypi/controller/rpi/ccm.hpp
new file mode 100644
index 00000000..f6f4dee1
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/rpi/ccm.hpp
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * ccm.hpp - CCM (colour correction matrix) control algorithm
+ */
+#pragma once
+
+#include <vector>
+#include <atomic>
+
+#include "../ccm_algorithm.hpp"
+#include "../pwl.hpp"
+
+namespace RPi {
+
+// Algorithm to calculate colour matrix. Should be placed after AWB.
+
+struct Matrix {
+	Matrix(double m0, double m1, double m2, double m3, double m4, double m5,
+	       double m6, double m7, double m8);
+	Matrix();
+	double m[3][3];
+	void Read(boost::property_tree::ptree const &params);
+};
+static inline Matrix operator*(double d, Matrix const &m)
+{
+	return Matrix(m.m[0][0] * d, m.m[0][1] * d, m.m[0][2] * d,
+		      m.m[1][0] * d, m.m[1][1] * d, m.m[1][2] * d,
+		      m.m[2][0] * d, m.m[2][1] * d, m.m[2][2] * d);
+}
+static inline Matrix operator*(Matrix const &m1, Matrix const &m2)
+{
+	Matrix m;
+	for (int i = 0; i < 3; i++)
+		for (int j = 0; j < 3; j++)
+			m.m[i][j] = m1.m[i][0] * m2.m[0][j] +
+				    m1.m[i][1] * m2.m[1][j] +
+				    m1.m[i][2] * m2.m[2][j];
+	return m;
+}
+static inline Matrix operator+(Matrix const &m1, Matrix const &m2)
+{
+	Matrix m;
+	for (int i = 0; i < 3; i++)
+		for (int j = 0; j < 3; j++)
+			m.m[i][j] = m1.m[i][j] + m2.m[i][j];
+	return m;
+}
+
+struct CtCcm {
+	double ct;
+	Matrix ccm;
+};
+
+struct CcmConfig {
+	std::vector<CtCcm> ccms;
+	Pwl saturation;
+};
+
+class Ccm : public CcmAlgorithm
+{
+public:
+	Ccm(Controller *controller = NULL);
+	char const *Name() const override;
+	void Read(boost::property_tree::ptree const &params) override;
+	void SetSaturation(double saturation) override;
+	void Initialise() override;
+	void Prepare(Metadata *image_metadata) override;
+
+private:
+	CcmConfig config_;
+	std::atomic<double> saturation_;
+};
+
+} // namespace RPi