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diff --git a/src/3rdparty/freetype/src/sdf/ftsdfrend.h b/src/3rdparty/freetype/src/sdf/ftsdfrend.h
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+/****************************************************************************
+ *
+ * ftsdfrend.h
+ *
+ *   Signed Distance Field renderer interface (specification).
+ *
+ * Copyright (C) 2020-2023 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 FTSDFREND_H_
+#define FTSDFREND_H_
+
+#include <freetype/ftrender.h>
+#include <freetype/ftmodapi.h>
+#include <freetype/internal/ftobjs.h>
+
+FT_BEGIN_HEADER
+
+
+  /**************************************************************************
+   *
+   * @struct:
+   *   SDF_Renderer_Module
+   *
+   * @description:
+   *   This struct extends the native renderer struct `FT_RendererRec`.  It
+   *   is basically used to store various parameters required by the
+   *   renderer and some additional parameters that can be used to tweak the
+   *   output of the renderer.
+   *
+   * @fields:
+   *   root ::
+   *     The native rendere struct.
+   *
+   *   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 makes 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 except `overlaps` are valid for both the 'sdf' and
+   *   'bsdf' renderers.
+   *
+   */
+  typedef struct  SDF_Renderer_Module_
+  {
+    FT_RendererRec  root;
+    FT_UInt         spread;
+    FT_Bool         flip_sign;
+    FT_Bool         flip_y;
+    FT_Bool         overlaps;
+
+  } SDF_Renderer_Module, *SDF_Renderer;
+
+
+  /**************************************************************************
+   *
+   * @renderer:
+   *   ft_sdf_renderer_class
+   *
+   * @description:
+   *   Renderer to convert @FT_Outline to signed distance fields.
+   *
+   */
+  FT_DECLARE_RENDERER( ft_sdf_renderer_class )
+
+
+  /**************************************************************************
+   *
+   * @renderer:
+   *   ft_bitmap_sdf_renderer_class
+   *
+   * @description:
+   *   This is not exactly a renderer; it is just a converter that
+   *   transforms bitmaps to signed distance fields.
+   *
+   * @note:
+   *   This is not a separate module, it is part of the 'sdf' module.
+   *
+   */
+  FT_DECLARE_RENDERER( ft_bitmap_sdf_renderer_class )
+
+
+FT_END_HEADER
+
+#endif /* FTSDFREND_H_ */
+
+
+/* END */