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diff --git a/src/curveeditor/detail/utils.h b/src/curveeditor/detail/utils.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Design Tooling
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+class QColor;
+class QPalette;
+class QPointF;
+class QRectF;
+class QTransform;
+
+namespace DesignTools {
+
+class Keyframe;
+
+double clamp(double val, double lo, double hi);
+
+double lerp(double blend, double a, double b);
+
+double scaleX(const QTransform &transform);
+
+double scaleY(const QTransform &transform);
+
+void grow(QRectF &rect, const QPointF &point);
+
+QRectF bbox(const QRectF &rect, const QTransform &transform);
+
+QPalette singleColorPalette(const QColor &color);
+
+} // End namespace DesignTools.