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diff --git a/src/ipa/rpi/controller/sharpen_status.h b/src/ipa/rpi/controller/sharpen_status.h
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+++ b/src/ipa/rpi/controller/sharpen_status.h
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi Ltd
+ *
+ * sharpen_status.h - Sharpen control algorithm status
+ */
+#pragma once
+
+/* The "sharpen" algorithm stores the strength to use. */
+
+struct SharpenStatus {
+	/* controls the smallest level of detail (or noise!) that sharpening will pick up */
+	double threshold;
+	/* the rate at which the sharpening response ramps once above the threshold */
+	double strength;
+	/* upper limit of the allowed sharpening response */
+	double limit;
+	/* The sharpening strength requested by the user or application. */
+	double userStrength;
+};