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diff --git a/src/ipa/raspberrypi/controller/contrast_algorithm.h b/src/ipa/raspberrypi/controller/contrast_algorithm.h
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * contrast_algorithm.h - contrast (gamma) control algorithm interface
+ */
+#pragma once
+
+#include "algorithm.h"
+
+namespace RPiController {
+
+class ContrastAlgorithm : public Algorithm
+{
+public:
+ ContrastAlgorithm(Controller *controller) : Algorithm(controller) {}
+ /* A contrast algorithm must provide the following: */
+ virtual void setBrightness(double brightness) = 0;
+ virtual void setContrast(double contrast) = 0;
+};
+
+} /* namespace RPiController */