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diff --git a/source/blender/modifiers/intern/MOD_weightvg_util.h b/source/blender/modifiers/intern/MOD_weightvg_util.h
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+/*
+ * $Id$
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software  Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2011 by Bastien Montagne.
+ * All rights reserved.
+ *
+ * Contributor(s): None yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ *
+ */
+
+/** \file blender/modifiers/intern/MOD_util.h
+ *  \ingroup modifiers
+ */
+
+
+#ifndef MOD_WEIGHTVG_UTIL_H
+#define MOD_WEIGHTVG_UTIL_H
+
+/* so modifier types match their defines */
+#include "MOD_modifiertypes.h"
+
+struct CurveMapping;
+struct DerivedMesh;
+struct Object;
+struct Tex;
+
+/*
+ * XXX I'd like to make modified weights visible in WeightPaint mode,
+ *     but couldn't figure a way to do this...
+ *     Maybe this will need changes in mesh_calc_modifiers (DerivedMesh.c)?
+ *     Or the WeightPaint mode code itself?
+ */
+
+/**************************************
+ * Util functions.                    *
+ **************************************/
+
+/* We cannot divide by zero (what a surprise...).
+ * So if -MOD_WEIGHTVGROUP_DIVMODE_ZEROFLOOR < weightf < MOD_WEIGHTVGROUP_DIVMODE_ZEROFLOOR,
+ * we clamp weightf to this value (or its negative version).
+ * Also used to avoid null power factor.
+ */
+#define MOD_WVG_ZEROFLOOR		1.0e-32f
+
+/* Maps new_w weights in place, using either one of the predifined functions, or a custom curve.
+ * Return values are in new_w.
+ * If indices is not NULL, it must be a table of same length as org_w and new_w, mapping to the real
+ * vertex index (in case the weight tables do not cover the whole vertices...).
+ * cmap might be NULL, in which case curve mapping mode will return unmodified data.
+ */
+void weightvg_do_map(int num, float *new_w, short mode, struct CurveMapping *cmap);
+
+/* Applies new_w weights to org_w ones, using either a texture, vgroup or constant value as factor.
+ * Return values are in org_w.
+ * If indices is not NULL, it must be a table of same length as org_w and new_w, mapping to the real
+ * vertex index (in case the weight tables do not cover the whole vertices...).
+ * XXX The standard “factor” value is assumed in [0.0, 1.0] range. Else, weird results might appear.
+ */
+void weightvg_do_mask(int num, const int *indices, float *org_w, const float *new_w, Object *ob,
+                      DerivedMesh *dm, float fact, const char defgrp_name[32], Tex *texture,
+                      int tex_use_channel, int tex_mapping, Object *tex_map_object,
+                      const char *tex_uvlayer_name);
+
+/* Applies weights to given vgroup (defgroup), and optionnaly add/remove vertices from the group.
+ * If indices is not NULL, it must be a table of same length as weights, mapping to the real
+ * vertex index (in case the weight table does not cover the whole vertices...).
+ */
+void weightvg_update_vg(MDeformVert *dvert, int defgrp_idx, int num,
+                        const int *indices, const float *weights, int do_add,
+                        float add_thresh, int do_rem, float rem_thresh);
+
+#endif /* MOD_WEIGHTVG_UTIL_H */