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diff --git a/include/drawinglayer/converters.hxx b/include/drawinglayer/converters.hxx
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+++ b/include/drawinglayer/converters.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <vcl/bitmapex.hxx>
+#include <drawinglayer/primitive2d/Primitive2DContainer.hxx>
+
+namespace drawinglayer
+{
+// Helper that just creates the AlphaMask for a given Seq of Primitives.
+// If only the mask is needed this can be significantly faster then
+// creating content & mask in a BitmapEx (since the creation uses
+// e.g. a unified color for gradients instead of having to fully paint
+// these)
+// New mode: bUseLuminance allows simple creation of alpha channels
+//           for any content (e.g. gradients)
+AlphaMask DRAWINGLAYER_DLLPUBLIC createAlphaMask(
+    drawinglayer::primitive2d::Primitive2DContainer&& rSeq,
+    const geometry::ViewInformation2D& rViewInformation2D, sal_uInt32 nDiscreteWidth,
+    sal_uInt32 nDiscreteHeight, sal_uInt32 nMaxSquarePixels, bool bUseLuminance = false);
+
+// Helper for convertPrimitive2DContainerToBitmapEx below, but can be also used
+// directly
+BitmapEx DRAWINGLAYER_DLLPUBLIC convertToBitmapEx(
+    drawinglayer::primitive2d::Primitive2DContainer&& rSeq,
+    const geometry::ViewInformation2D& rViewInformation2D, sal_uInt32 nDiscreteWidth,
+    sal_uInt32 nDiscreteHeight, sal_uInt32 nMaxSquarePixels, bool bForceAlphaMaskCreation = false);
+
+// helper to convert any Primitive2DSequence to a good quality BitmapEx,
+// using default parameters
+BitmapEx DRAWINGLAYER_DLLPUBLIC convertPrimitive2DContainerToBitmapEx(
+    drawinglayer::primitive2d::Primitive2DContainer&& rSeq, const basegfx::B2DRange& rTargetRange,
+    const sal_uInt32 nMaximumQuadraticPixels = 500000,
+    const o3tl::Length eTargetUnit = o3tl::Length::mm100,
+    const std::optional<Size>& rTargetDPI = std::nullopt);
+
+} // end of namespace drawinglayer
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */