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diff --git a/src/ipa/raspberrypi/controller/rpi/focus.h b/src/ipa/raspberrypi/controller/rpi/focus.h
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2020, Raspberry Pi (Trading) Limited
+ *
+ * focus.h - focus algorithm
+ */
+#pragma once
+
+#include "../algorithm.h"
+#include "../metadata.h"
+
+/*
+ * The "focus" algorithm. All it does it print out a version of the
+ * focus contrast measure; there is no actual auto-focus mechanism to
+ * control.
+ */
+
+namespace RPiController {
+
+class Focus : public Algorithm
+{
+public:
+ Focus(Controller *controller);
+ char const *name() const override;
+ void process(StatisticsPtr &stats, Metadata *imageMetadata) override;
+};
+
+} /* namespace RPiController */