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, 51 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/rpi/contrast.hpp b/src/ipa/raspberrypi/controller/rpi/contrast.hpp
new file mode 100644
index 00000000..2e38a762
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/rpi/contrast.hpp
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * contrast.hpp - contrast (gamma) control algorithm
+ */
+#pragma once
+
+#include <atomic>
+#include <mutex>
+
+#include "../contrast_algorithm.hpp"
+#include "../pwl.hpp"
+
+namespace RPi {
+
+// Back End algorithm to appaly correct digital gain. Should be placed after
+// Back End AWB.
+
+struct ContrastConfig {
+	bool ce_enable;
+	double lo_histogram;
+	double lo_level;
+	double lo_max;
+	double hi_histogram;
+	double hi_level;
+	double hi_max;
+	Pwl gamma_curve;
+};
+
+class Contrast : public ContrastAlgorithm
+{
+public:
+	Contrast(Controller *controller = NULL);
+	char const *Name() const override;
+	void Read(boost::property_tree::ptree const &params) override;
+	void SetBrightness(double brightness) override;
+	void SetContrast(double contrast) override;
+	void Initialise() override;
+	void Prepare(Metadata *image_metadata) override;
+	void Process(StatisticsPtr &stats, Metadata *image_metadata) override;
+
+private:
+	ContrastConfig config_;
+	std::atomic<double> brightness_;
+	std::atomic<double> contrast_;
+	ContrastStatus status_;
+	std::mutex mutex_;
+};
+
+} // namespace RPi