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diff --git a/src/3rdparty/freetype/src/sdf/ftsdf.h b/src/3rdparty/freetype/src/sdf/ftsdf.h
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+/****************************************************************************
+ *
+ * ftsdf.h
+ *
+ *   Signed Distance Field support (specification).
+ *
+ * Copyright (C) 2020-2022 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * Written by Anuj Verma.
+ *
+ * This file is part of the FreeType project, and may only be used,
+ * modified, and distributed under the terms of the FreeType project
+ * license, LICENSE.TXT.  By continuing to use, modify, or distribute
+ * this file you indicate that you have read the license and
+ * understand and accept it fully.
+ *
+ */
+
+
+#ifndef FTSDF_H_
+#define FTSDF_H_
+
+#include <ft2build.h>
+#include FT_CONFIG_CONFIG_H
+#include <freetype/ftimage.h>
+
+/* common properties and function */
+#include "ftsdfcommon.h"
+
+FT_BEGIN_HEADER
+
+  /**************************************************************************
+   *
+   * @struct:
+   *   SDF_Raster_Params
+   *
+   * @description:
+   *   This struct must be passed to the raster render function
+   *   @FT_Raster_RenderFunc instead of @FT_Raster_Params because the
+   *   rasterizer requires some additional information to render properly.
+   *
+   * @fields:
+   *   root ::
+   *     The native raster parameters structure.
+   *
+   *   spread ::
+   *     This is an essential parameter/property required by the renderer.
+   *     `spread` defines the maximum unsigned value that is present in the
+   *     final SDF output.  For the default value check file
+   *     `ftsdfcommon.h`.
+   *
+   *   flip_sign ::
+   *     By default positive values indicate positions inside of contours,
+   *     i.e., filled by a contour.  If this property is true then that
+   *     output will be the opposite of the default, i.e., negative values
+   *     indicate positions inside of contours.
+   *
+   *   flip_y ::
+   *     Setting this parameter to true maked the output image flipped
+   *     along the y-axis.
+   *
+   *   overlaps ::
+   *     Set this to true to generate SDF for glyphs having overlapping
+   *     contours.  The overlapping support is limited to glyphs that do not
+   *     have self-intersecting contours.  Also, removing overlaps require a
+   *     considerable amount of extra memory; additionally, it will not work
+   *     if generating SDF from bitmap.
+   *
+   * @note:
+   *   All properties are valid for both the 'sdf' and 'bsdf' renderers; the
+   *   exception is `overlaps`, which gets ignored by the 'bsdf' renderer.
+   *
+   */
+  typedef struct  SDF_Raster_Params_
+  {
+    FT_Raster_Params  root;
+    FT_UInt           spread;
+    FT_Bool           flip_sign;
+    FT_Bool           flip_y;
+    FT_Bool           overlaps;
+
+  } SDF_Raster_Params;
+
+
+  /* rasterizer to convert outline to SDF */
+  FT_EXPORT_VAR( const FT_Raster_Funcs )  ft_sdf_raster;
+
+  /* rasterizer to convert bitmap to SDF */
+  FT_EXPORT_VAR( const FT_Raster_Funcs )  ft_bitmap_sdf_raster;
+
+FT_END_HEADER
+
+#endif /* FTSDF_H_ */
+
+
+/* END */