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diff --git a/sw/source/core/txtnode/justify.hxx b/sw/source/core/txtnode/justify.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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/.
+ */
+
+#pragma once
+#include <sal/types.h>
+
+namespace Justify
+{
+/// Get model position base on given kern array.
+/// @param rKernArray text positions from OutDev::GetTextArray().
+/// @param nLen number of elements to process in rKernArray.
+/// @param nX the visual position
+SW_DLLPUBLIC sal_Int32 GetModelPosition(const std::vector<sal_Int32>& rKernArray, sal_Int32 nLen,
+                                        tools::Long nX);
+/// Distribute space between words and letters.
+/// @param[in,out] rKernArray text positions from OutDev::GetTextArray().
+/// @param rText string used to determine where space and kern are inserted.
+/// @param nStt starting index of rText.
+/// @param nLen number of elements to process in rKernArray and rText.
+/// @param nSpaceAdd amount of space to insert for each CH_BLANK.
+/// @param nKern amount of space to insert between letters.
+/// @param bNoHalfSpace whether to split the space into two halves.
+///        Split spaces are inserted before and after CH_BLANK.
+///        Set to true in word line mode and for Arabic text to avoid splitting.
+SW_DLLPUBLIC void SpaceDistribution(std::vector<sal_Int32>& rKernArray, const OUString& rText,
+                                    sal_Int32 nStt, sal_Int32 nLen, tools::Long nSpaceAdd,
+                                    tools::Long nKern, bool bNoHalfSpace);
+
+/// Snap ideographs to text grids:
+/// a) Ideographic open brackets are aligned to the rightmost edge of spanned grids so that
+//  they can be closer to the next ideograph.
+/// b) Ideographic close brackets, ideographic comma, and ideographic fullstop are aligned
+/// to the leftmost edge of spanned grids so that they can be closer to the previous
+/// ideograph.
+/// c) Other ideographs are aligned to the center of the spanned grids.
+/// @param[in,out] rKernArray text positions from OutDev::GetTextArray().
+/// @param rText string used to determine where space and kern are inserted.
+/// @param nStt starting index of rText.
+/// @param nLen number of elements to process in rKernArray and rText.
+/// @param nGridWidth width of a text grid
+/// @param bForceLeft for align to the left edge of the grid disregard of the punctuation type.
+/// This is useful for calculate text width, line break, and conversion model position.
+/// @return the delta offset of first glyph so text origin can be updated accordingly.
+SW_DLLPUBLIC tools::Long SnapToGrid(std::vector<sal_Int32>& rKernArray, const OUString& rText,
+                                    sal_Int32 nStt, sal_Int32 nLen, tools::Long nGridWidth,
+                                    bool bForceLeft);
+
+/// Snap ideographs to text grids edge ( used when snap to char is off ):
+/// space will be distributed ( in case that alignment is set to justify. ).
+/// @param[in,out] rKernArray text positions from OutDev::GetTextArray().
+/// @param nLen number of elements to process in rKernArray and rText.
+/// @param nGridWidth width of a text grid
+/// @param nSpace amount of space distributed under justify text alignment mode.
+/// @param nKern letter spacing.
+SW_DLLPUBLIC void SnapToGridEdge(std::vector<sal_Int32>& rKernArray, sal_Int32 nLen,
+                                 tools::Long nGridWidth, tools::Long nSpace, tools::Long nKern);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */