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diff --git a/source/blender/editors/gizmo_library/gizmo_library_intern.h b/source/blender/editors/gizmo_library/gizmo_library_intern.h
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+/*
+ * ***** 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) 2016 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file gizmo_library_intern.h
+ *  \ingroup wm
+ */
+
+#ifndef __GIZMO_LIBRARY_INTERN_H__
+#define __GIZMO_LIBRARY_INTERN_H__
+
+/* distance around which manipulators respond to input (and get highlighted) */
+#define MANIPULATOR_HOTSPOT 14.0f
+
+/**
+ * Data for common interactions. Used in manipulator_library_utils.c functions.
+ */
+typedef struct ManipulatorCommonData {
+	int flag;
+
+	float range_fac;      /* factor for arrow min/max distance */
+	float offset;
+
+	/* property range for constrained manipulators */
+	float range;
+	/* min/max value for constrained manipulators */
+	float min, max;
+} ManipulatorCommonData;
+
+typedef struct ManipulatorInteraction {
+	float init_value; /* initial property value */
+	float init_mval[2];
+	float init_offset;
+	float init_matrix_final[4][4];
+	float init_matrix_basis[4][4];
+
+	/* offset of last handling step */
+	float prev_offset;
+	/* Total offset added by precision tweaking.
+	 * Needed to allow toggling precision on/off without causing jumps */
+	float precision_offset;
+} ManipulatorInteraction;
+
+/* ManipulatorCommonData->flag  */
+enum {
+	MANIPULATOR_CUSTOM_RANGE_SET = (1 << 0),
+};
+
+
+float manipulator_offset_from_value(
+        ManipulatorCommonData *data, const float value,
+        const bool constrained, const bool inverted);
+float manipulator_value_from_offset(
+        ManipulatorCommonData *data, ManipulatorInteraction *inter, const float offset,
+        const bool constrained, const bool inverted, const bool use_precision);
+
+void manipulator_property_data_update(
+        struct wmManipulator *mpr, ManipulatorCommonData *data, wmManipulatorProperty *mpr_prop,
+        const bool constrained, const bool inverted);
+
+void  manipulator_property_value_reset(
+        bContext *C, const struct wmManipulator *mpr, ManipulatorInteraction *inter, wmManipulatorProperty *mpr_prop);
+
+
+/* -------------------------------------------------------------------- */
+
+void manipulator_color_get(
+        const struct wmManipulator *mpr, const bool highlight,
+        float r_color[4]);
+
+bool manipulator_window_project_2d(
+        bContext *C, const struct wmManipulator *mpr, const float mval[2], int axis, bool use_offset,
+        float r_co[2]);
+
+bool manipulator_window_project_3d(
+        bContext *C, const struct wmManipulator *mpr, const float mval[2], bool use_offset,
+        float r_co[3]);
+
+/* -------------------------------------------------------------------- */
+/* Manipulator drawing */
+
+#include "gizmo_geometry.h"
+
+void wm_manipulator_geometryinfo_draw(const struct ManipulatorGeomInfo *info, const bool select, const float color[4]);
+void wm_manipulator_vec_draw(
+        const float color[4], const float (*verts)[3], uint vert_count,
+        uint pos, uint primitive_type);
+
+
+#endif  /* __GIZMO_LIBRARY_INTERN_H__ */