Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 3082 insertions, 0 deletions

diff --git a/modules/freetype2/src/smooth/ftgrays.c b/modules/freetype2/src/smooth/ftgrays.c
new file mode 100644
index 0000000000..d9f20eef13
--- /dev/null
+++ b/modules/freetype2/src/smooth/ftgrays.c
@@ -0,0 +1,2230 @@
+/****************************************************************************
+ *
+ * ftgrays.c
+ *
+ *   A new `perfect' anti-aliasing renderer (body).
+ *
+ * Copyright (C) 2000-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * 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.
+ *
+ */
+
+  /**************************************************************************
+   *
+   * This file can be compiled without the rest of the FreeType engine, by
+   * defining the STANDALONE_ macro when compiling it.  You also need to
+   * put the files `ftgrays.h' and `ftimage.h' into the current
+   * compilation directory.  Typically, you could do something like
+   *
+   * - copy `src/smooth/ftgrays.c' (this file) to your current directory
+   *
+   * - copy `include/freetype/ftimage.h' and `src/smooth/ftgrays.h' to the
+   *   same directory
+   *
+   * - compile `ftgrays' with the STANDALONE_ macro defined, as in
+   *
+   *     cc -c -DSTANDALONE_ ftgrays.c
+   *
+   * The renderer can be initialized with a call to
+   * `ft_gray_raster.raster_new'; an anti-aliased bitmap can be generated
+   * with a call to `ft_gray_raster.raster_render'.
+   *
+   * See the comments and documentation in the file `ftimage.h' for more
+   * details on how the raster works.
+   *
+   */
+
+  /**************************************************************************
+   *
+   * This is a new anti-aliasing scan-converter for FreeType 2.  The
+   * algorithm used here is _very_ different from the one in the standard
+   * `ftraster' module.  Actually, `ftgrays' computes the _exact_
+   * coverage of the outline on each pixel cell by straight segments.
+   *
+   * It is based on ideas that I initially found in Raph Levien's
+   * excellent LibArt graphics library (see https://www.levien.com/libart
+   * for more information, though the web pages do not tell anything
+   * about the renderer; you'll have to dive into the source code to
+   * understand how it works).
+   *
+   * Note, however, that this is a _very_ different implementation
+   * compared to Raph's.  Coverage information is stored in a very
+   * different way, and I don't use sorted vector paths.  Also, it doesn't
+   * use floating point values.
+   *
+   * Bézier segments are flattened by splitting them until their deviation
+   * from straight line becomes much smaller than a pixel.  Therefore, the
+   * pixel coverage by a Bézier curve is calculated approximately.  To
+   * estimate the deviation, we use the distance from the control point
+   * to the conic chord centre or the cubic chord trisection.  These
+   * distances vanish fast after each split.  In the conic case, they vanish
+   * predictably and the number of necessary splits can be calculated.
+   *
+   * This renderer has the following advantages:
+   *
+   * - It doesn't need an intermediate bitmap.  Instead, one can supply a
+   *   callback function that will be called by the renderer to draw gray
+   *   spans on any target surface.  You can thus do direct composition on
+   *   any kind of bitmap, provided that you give the renderer the right
+   *   callback.
+   *
+   * - A perfect anti-aliaser, i.e., it computes the _exact_ coverage on
+   *   each pixel cell by straight segments.
+   *
+   * - It performs a single pass on the outline (the `standard' FT2
+   *   renderer makes two passes).
+   *
+   * - It can easily be modified to render to _any_ number of gray levels
+   *   cheaply.
+   *
+   * - For small (< 80) pixel sizes, it is faster than the standard
+   *   renderer.
+   *
+   */
+
+
+  /**************************************************************************
+   *
+   * The macro FT_COMPONENT is used in trace mode.  It is an implicit
+   * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
+   * messages during execution.
+   */
+#undef  FT_COMPONENT
+#define FT_COMPONENT  smooth
+
+
+#ifdef STANDALONE_
+
+
+  /* The size in bytes of the render pool used by the scan-line converter  */
+  /* to do all of its work.                                                */
+#define FT_RENDER_POOL_SIZE  16384L
+
+
+  /* Auxiliary macros for token concatenation. */
+#define FT_ERR_XCAT( x, y )  x ## y
+#define FT_ERR_CAT( x, y )   FT_ERR_XCAT( x, y )
+
+#define FT_BEGIN_STMNT  do {
+#define FT_END_STMNT    } while ( 0 )
+
+#define FT_MIN( a, b )  ( (a) < (b) ? (a) : (b) )
+#define FT_MAX( a, b )  ( (a) > (b) ? (a) : (b) )
+#define FT_ABS( a )     ( (a) < 0 ? -(a) : (a) )
+
+
+  /*
+   * Approximate sqrt(x*x+y*y) using the `alpha max plus beta min'
+   * algorithm.  We use alpha = 1, beta = 3/8, giving us results with a
+   * largest error less than 7% compared to the exact value.
+   */
+#define FT_HYPOT( x, y )                 \
+          ( x = FT_ABS( x ),             \
+            y = FT_ABS( y ),             \
+            x > y ? x + ( 3 * y >> 3 )   \
+                  : y + ( 3 * x >> 3 ) )
+
+
+  /* define this to dump debugging information */
+/* #define FT_DEBUG_LEVEL_TRACE */
+
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+#include <stdio.h>
+#include <stdarg.h>
+#endif
+
+#include <stddef.h>
+#include <string.h>
+#include <setjmp.h>
+#include <limits.h>
+#define FT_CHAR_BIT   CHAR_BIT
+#define FT_UINT_MAX   UINT_MAX
+#define FT_INT_MAX    INT_MAX
+#define FT_ULONG_MAX  ULONG_MAX
+
+#define ADD_INT( a, b )                                  \
+          (int)( (unsigned int)(a) + (unsigned int)(b) )
+
+#define FT_STATIC_BYTE_CAST( type, var )  (type)(unsigned char)(var)
+
+
+#define ft_memset   memset
+
+#define ft_setjmp   setjmp
+#define ft_longjmp  longjmp
+#define ft_jmp_buf  jmp_buf
+
+typedef ptrdiff_t  FT_PtrDist;
+
+
+#define Smooth_Err_Ok                    0
+#define Smooth_Err_Invalid_Outline      -1
+#define Smooth_Err_Cannot_Render_Glyph  -2
+#define Smooth_Err_Invalid_Argument     -3
+#define Smooth_Err_Raster_Overflow      -4
+
+#define FT_BEGIN_HEADER
+#define FT_END_HEADER
+
+#include "ftimage.h"
+#include "ftgrays.h"
+
+
+  /* This macro is used to indicate that a function parameter is unused. */
+  /* Its purpose is simply to reduce compiler warnings.  Note also that  */
+  /* simply defining it as `(void)x' doesn't avoid warnings with certain */
+  /* ANSI compilers (e.g. LCC).                                          */
+#define FT_UNUSED( x )  (x) = (x)
+
+
+  /* we only use level 5 & 7 tracing messages; cf. ftdebug.h */
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+
+  void
+  FT_Message( const char*  fmt,
+              ... )
+  {
+    va_list  ap;
+
+
+    va_start( ap, fmt );
+    vfprintf( stderr, fmt, ap );
+    va_end( ap );
+  }
+
+
+  /* empty function useful for setting a breakpoint to catch errors */
+  int
+  FT_Throw( int          error,
+            int          line,
+            const char*  file )
+  {
+    FT_UNUSED( error );
+    FT_UNUSED( line );
+    FT_UNUSED( file );
+
+    return 0;
+  }
+
+
+  /* we don't handle tracing levels in stand-alone mode; */
+#ifndef FT_TRACE5
+#define FT_TRACE5( varformat )  FT_Message varformat
+#endif
+#ifndef FT_TRACE7
+#define FT_TRACE7( varformat )  FT_Message varformat
+#endif
+#ifndef FT_ERROR
+#define FT_ERROR( varformat )   FT_Message varformat
+#endif
+
+#define FT_THROW( e )                                \
+          ( FT_Throw( FT_ERR_CAT( Smooth_Err_, e ),  \
+                      __LINE__,                      \
+                      __FILE__ )                   | \
+            FT_ERR_CAT( Smooth_Err_, e )           )
+
+#else /* !FT_DEBUG_LEVEL_TRACE */
+
+#define FT_TRACE5( x )  do { } while ( 0 )     /* nothing */
+#define FT_TRACE7( x )  do { } while ( 0 )     /* nothing */
+#define FT_ERROR( x )   do { } while ( 0 )     /* nothing */
+#define FT_THROW( e )   FT_ERR_CAT( Smooth_Err_, e )
+
+#endif /* !FT_DEBUG_LEVEL_TRACE */
+
+
+#define FT_Trace_Enable()   do { } while ( 0 )  /* nothing */
+#define FT_Trace_Disable()  do { } while ( 0 )  /* nothing */
+
+
+#define FT_DEFINE_OUTLINE_FUNCS( class_,               \
+                                 move_to_, line_to_,   \
+                                 conic_to_, cubic_to_, \
+                                 shift_, delta_ )      \
+          static const FT_Outline_Funcs class_ =       \
+          {                                            \
+            move_to_,                                  \
+            line_to_,                                  \
+            conic_to_,                                 \
+            cubic_to_,                                 \
+            shift_,                                    \
+            delta_                                     \
+         };
+
+#define FT_DEFINE_RASTER_FUNCS( class_, glyph_format_,            \
+                                raster_new_, raster_reset_,       \
+                                raster_set_mode_, raster_render_, \
+                                raster_done_ )                    \
+          const FT_Raster_Funcs class_ =                          \
+          {                                                       \
+            glyph_format_,                                        \
+            raster_new_,                                          \
+            raster_reset_,                                        \
+            raster_set_mode_,                                     \
+            raster_render_,                                       \
+            raster_done_                                          \
+         };
+
+
+#else /* !STANDALONE_ */
+
+
+#include <ft2build.h>
+#include FT_CONFIG_CONFIG_H
+#include "ftgrays.h"
+#include <freetype/internal/ftobjs.h>
+#include <freetype/internal/ftdebug.h>
+#include <freetype/internal/ftcalc.h>
+#include <freetype/ftoutln.h>
+
+#include "ftsmerrs.h"
+
+
+#endif /* !STANDALONE_ */
+
+
+#ifndef FT_MEM_SET
+#define FT_MEM_SET( d, s, c )  ft_memset( d, s, c )
+#endif
+
+#ifndef FT_MEM_ZERO
+#define FT_MEM_ZERO( dest, count )  FT_MEM_SET( dest, 0, count )
+#endif
+
+#ifndef FT_ZERO
+#define FT_ZERO( p )  FT_MEM_ZERO( p, sizeof ( *(p) ) )
+#endif
+
+  /* as usual, for the speed hungry :-) */
+
+#undef RAS_ARG
+#undef RAS_ARG_
+#undef RAS_VAR
+#undef RAS_VAR_
+
+#ifndef FT_STATIC_RASTER
+
+#define RAS_ARG   gray_PWorker  worker
+#define RAS_ARG_  gray_PWorker  worker,
+
+#define RAS_VAR   worker
+#define RAS_VAR_  worker,
+
+#else /* FT_STATIC_RASTER */
+
+#define RAS_ARG   void
+#define RAS_ARG_  /* empty */
+#define RAS_VAR   /* empty */
+#define RAS_VAR_  /* empty */
+
+#endif /* FT_STATIC_RASTER */
+
+
+  /* must be at least 6 bits! */
+#define PIXEL_BITS  8
+
+#define ONE_PIXEL       ( 1 << PIXEL_BITS )
+#undef TRUNC
+#define TRUNC( x )      (TCoord)( (x) >> PIXEL_BITS )
+#undef FRACT
+#define FRACT( x )      (TCoord)( (x) & ( ONE_PIXEL - 1 ) )
+
+#if PIXEL_BITS >= 6
+#define UPSCALE( x )    ( (x) * ( ONE_PIXEL >> 6 ) )
+#define DOWNSCALE( x )  ( (x) >> ( PIXEL_BITS - 6 ) )
+#else
+#define UPSCALE( x )    ( (x) >> ( 6 - PIXEL_BITS ) )
+#define DOWNSCALE( x )  ( (x) * ( 64 >> PIXEL_BITS ) )
+#endif
+
+
+  /* Compute `dividend / divisor' and return both its quotient and     */
+  /* remainder, cast to a specific type.  This macro also ensures that */
+  /* the remainder is always positive.  We use the remainder to keep   */
+  /* track of accumulating errors and compensate for them.             */
+#define FT_DIV_MOD( type, dividend, divisor, quotient, remainder ) \
+  FT_BEGIN_STMNT                                                   \
+    (quotient)  = (type)( (dividend) / (divisor) );                \
+    (remainder) = (type)( (dividend) % (divisor) );                \
+    if ( (remainder) < 0 )                                         \
+    {                                                              \
+      (quotient)--;                                                \
+      (remainder) += (type)(divisor);                              \
+    }                                                              \
+  FT_END_STMNT
+
+#if defined( __GNUC__ ) && __GNUC__ < 7 && defined( __arm__ )
+  /* Work around a bug specific to GCC which make the compiler fail to */
+  /* optimize a division and modulo operation on the same parameters   */
+  /* into a single call to `__aeabi_idivmod'.  See                     */
+  /*                                                                   */
+  /*  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43721               */
+#undef FT_DIV_MOD
+#define FT_DIV_MOD( type, dividend, divisor, quotient, remainder ) \
+  FT_BEGIN_STMNT                                                   \
+    (quotient)  = (type)( (dividend) / (divisor) );                \
+    (remainder) = (type)( (dividend) - (quotient) * (divisor) );   \
+    if ( (remainder) < 0 )                                         \
+    {                                                              \
+      (quotient)--;                                                \
+      (remainder) += (type)(divisor);                              \
+    }                                                              \
+  FT_END_STMNT
+#endif /* __arm__ */
+
+
+  /* Calculating coverages for a slanted line requires a division each */
+  /* time the line crosses from cell to cell.  These macros speed up   */
+  /* the repetitive divisions by replacing them with multiplications   */
+  /* and right shifts so that at most two divisions are performed for  */
+  /* each slanted line.  Nevertheless, these divisions are noticeable  */
+  /* in the overall performance because flattened curves produce a     */
+  /* very large number of slanted lines.                               */
+  /*                                                                   */
+  /* The division results here are always within ONE_PIXEL.  Therefore */
+  /* the shift magnitude should be at least PIXEL_BITS wider than the  */
+  /* divisors to provide sufficient accuracy of the multiply-shift.    */
+  /* It should not exceed (64 - PIXEL_BITS) to prevent overflowing and */
+  /* leave enough room for 64-bit unsigned multiplication however.     */
+#define FT_UDIVPREP( c, b )                                \
+  FT_Int64  b ## _r = c ? (FT_Int64)0xFFFFFFFF / ( b ) : 0
+#define FT_UDIV( a, b )                                           \
+  (TCoord)( ( (FT_UInt64)( a ) * (FT_UInt64)( b ## _r ) ) >> 32 )
+
+
+  /* Scale area and apply fill rule to calculate the coverage byte. */
+  /* The top fill bit is used for the non-zero rule. The eighth     */
+  /* fill bit is used for the even-odd rule.  The higher coverage   */
+  /* bytes are either clamped for the non-zero-rule or discarded    */
+  /* later for the even-odd rule.                                   */
+#define FT_FILL_RULE( coverage, area, fill )                \
+  FT_BEGIN_STMNT                                            \
+    coverage = (int)( area >> ( PIXEL_BITS * 2 + 1 - 8 ) ); \
+    if ( coverage & fill )                                  \
+      coverage = ~coverage;                                 \
+    if ( coverage > 255 && fill & INT_MIN )                 \
+      coverage = 255;                                       \
+  FT_END_STMNT
+
+
+  /* It is faster to write small spans byte-by-byte than calling     */
+  /* `memset'.  This is mainly due to the cost of the function call. */
+#define FT_GRAY_SET( d, s, count )                   \
+  FT_BEGIN_STMNT                                     \
+    unsigned char* q = d;                            \
+    switch ( count )                                 \
+    {                                                \
+      case 7: *q++ = (unsigned char)s; FALL_THROUGH; \
+      case 6: *q++ = (unsigned char)s; FALL_THROUGH; \
+      case 5: *q++ = (unsigned char)s; FALL_THROUGH; \
+      case 4: *q++ = (unsigned char)s; FALL_THROUGH; \
+      case 3: *q++ = (unsigned char)s; FALL_THROUGH; \
+      case 2: *q++ = (unsigned char)s; FALL_THROUGH; \
+      case 1: *q   = (unsigned char)s; FALL_THROUGH; \
+      case 0: break;                                 \
+      default: FT_MEM_SET( d, s, count );            \
+    }                                                \
+  FT_END_STMNT
+
+
+  /**************************************************************************
+   *
+   * TYPE DEFINITIONS
+   */
+
+  /* don't change the following types to FT_Int or FT_Pos, since we might */
+  /* need to define them to "float" or "double" when experimenting with   */
+  /* new algorithms                                                       */
+
+  typedef long  TPos;     /* subpixel coordinate               */
+  typedef int   TCoord;   /* integer scanline/pixel coordinate */
+  typedef int   TArea;    /* cell areas, coordinate products   */
+
+
+  typedef struct TCell_*  PCell;
+
+  typedef struct  TCell_
+  {
+    TCoord  x;     /* same with gray_TWorker.ex    */
+    TCoord  cover; /* same with gray_TWorker.cover */
+    TArea   area;
+    PCell   next;
+
+  } TCell;
+
+  typedef struct TPixmap_
+  {
+    unsigned char*  origin;  /* pixmap origin at the bottom-left */
+    int             pitch;   /* pitch to go down one row */
+
+  } TPixmap;
+
+  /* maximum number of gray cells in the buffer */
+#if FT_RENDER_POOL_SIZE > 2048
+#define FT_MAX_GRAY_POOL  ( FT_RENDER_POOL_SIZE / sizeof ( TCell ) )
+#else
+#define FT_MAX_GRAY_POOL  ( 2048 / sizeof ( TCell ) )
+#endif
+
+  /* FT_Span buffer size for direct rendering only */
+#define FT_MAX_GRAY_SPANS  16
+
+
+#if defined( _MSC_VER )      /* Visual C++ (and Intel C++) */
+  /* We disable the warning `structure was padded due to   */
+  /* __declspec(align())' in order to compile cleanly with */
+  /* the maximum level of warnings.                        */
+#pragma warning( push )
+#pragma warning( disable : 4324 )
+#endif /* _MSC_VER */
+
+  typedef struct  gray_TWorker_
+  {
+    ft_jmp_buf  jump_buffer;
+
+    TCoord  min_ex, max_ex;  /* min and max integer pixel coordinates */
+    TCoord  min_ey, max_ey;
+    TCoord  count_ey;        /* same as (max_ey - min_ey) */
+
+    PCell       cell;        /* current cell                             */
+    PCell       cell_free;   /* call allocation next free slot           */
+    PCell       cell_null;   /* last cell, used as dumpster and limit    */
+
+    PCell*      ycells;      /* array of cell linked-lists; one per      */
+                             /* vertical coordinate in the current band  */
+
+    TPos        x,  y;       /* last point position */
+
+    FT_Outline  outline;     /* input outline */
+    TPixmap     target;      /* target pixmap */
+
+    FT_Raster_Span_Func  render_span;
+    void*                render_span_data;
+
+  } gray_TWorker, *gray_PWorker;
+
+#if defined( _MSC_VER )
+#pragma warning( pop )
+#endif
+
+#ifndef FT_STATIC_RASTER
+#define ras  (*worker)
+#else
+  static gray_TWorker  ras;
+#endif
+
+  /* The |x| value of the null cell.  Must be the largest possible */
+  /* integer value stored in a `TCell.x` field.                    */
+#define CELL_MAX_X_VALUE    INT_MAX
+
+
+#define FT_INTEGRATE( ras, a, b )                                       \
+          ras.cell->cover = ADD_INT( ras.cell->cover, a ),              \
+          ras.cell->area  = ADD_INT( ras.cell->area, (a) * (TArea)(b) )
+
+
+  typedef struct gray_TRaster_
+  {
+    void*  memory;
+
+  } gray_TRaster, *gray_PRaster;
+
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+
+  /* to be called while in the debugger --                                */
+  /* this function causes a compiler warning since it is unused otherwise */
+  static void
+  gray_dump_cells( RAS_ARG )
+  {
+    int  y;
+
+
+    for ( y = ras.min_ey; y < ras.max_ey; y++ )
+    {
+      PCell  cell = ras.ycells[y - ras.min_ey];
+
+
+      printf( "%3d:", y );
+
+      for ( ; cell != ras.cell_null; cell = cell->next )
+        printf( " (%3d, c:%4d, a:%6d)",
+                cell->x, cell->cover, cell->area );
+      printf( "\n" );
+    }
+  }
+
+#endif /* FT_DEBUG_LEVEL_TRACE */
+
+
+  /**************************************************************************
+   *
+   * Set the current cell to a new position.
+   */
+  static void
+  gray_set_cell( RAS_ARG_ TCoord  ex,
+                          TCoord  ey )
+  {
+    /* Move the cell pointer to a new position in the linked list. We use  */
+    /* a dumpster null cell for everything outside of the clipping region  */
+    /* during the render phase.  This means that:                          */
+    /*                                                                     */
+    /* . the new vertical position must be within min_ey..max_ey-1.        */
+    /* . the new horizontal position must be strictly less than max_ex     */
+    /*                                                                     */
+    /* Note that if a cell is to the left of the clipping region, it is    */
+    /* actually set to the (min_ex-1) horizontal position.                 */
+
+    TCoord  ey_index = ey - ras.min_ey;
+
+
+    if ( ey_index < 0 || ey_index >= ras.count_ey || ex >= ras.max_ex )
+      ras.cell = ras.cell_null;
+    else
+    {
+      PCell*  pcell = ras.ycells + ey_index;
+      PCell   cell;
+
+
+      ex = FT_MAX( ex, ras.min_ex - 1 );
+
+      while ( 1 )
+      {
+        cell = *pcell;
+
+        if ( cell->x > ex )
+          break;
+
+        if ( cell->x == ex )
+          goto Found;
+
+        pcell = &cell->next;
+      }
+
+      /* insert new cell */
+      cell = ras.cell_free++;
+      if ( cell >= ras.cell_null )
+        ft_longjmp( ras.jump_buffer, 1 );
+
+      cell->x     = ex;
+      cell->area  = 0;
+      cell->cover = 0;
+
+      cell->next  = *pcell;
+      *pcell      = cell;
+
+    Found:
+      ras.cell = cell;
+    }
+  }
+
+
+#ifndef FT_INT64
+
+  /**************************************************************************
+   *
+   * Render a scanline as one or more cells.
+   */
+  static void
+  gray_render_scanline( RAS_ARG_ TCoord  ey,
+                                 TPos    x1,
+                                 TCoord  y1,
+                                 TPos    x2,
+                                 TCoord  y2 )
+  {
+    TCoord  ex1, ex2, fx1, fx2, first, dy, delta, mod;
+    TPos    p, dx;
+    int     incr;
+
+
+    ex1 = TRUNC( x1 );
+    ex2 = TRUNC( x2 );
+
+    /* trivial case.  Happens often */
+    if ( y1 == y2 )
+    {
+      gray_set_cell( RAS_VAR_ ex2, ey );
+      return;
+    }
+
+    fx1 = FRACT( x1 );
+    fx2 = FRACT( x2 );
+
+    /* everything is located in a single cell.  That is easy! */
+    /*                                                        */
+    if ( ex1 == ex2 )
+      goto End;
+
+    /* ok, we'll have to render a run of adjacent cells on the same */
+    /* scanline...                                                  */
+    /*                                                              */
+    dx = x2 - x1;
+    dy = y2 - y1;
+
+    if ( dx > 0 )
+    {
+      p     = ( ONE_PIXEL - fx1 ) * dy;
+      first = ONE_PIXEL;
+      incr  = 1;
+    }
+    else
+    {
+      p     = fx1 * dy;
+      first = 0;
+      incr  = -1;
+      dx    = -dx;
+    }
+
+    /* the fractional part of y-delta is mod/dx. It is essential to */
+    /* keep track of its accumulation for accurate rendering.       */
+    /* XXX: y-delta and x-delta below should be related.            */
+    FT_DIV_MOD( TCoord, p, dx, delta, mod );
+
+    FT_INTEGRATE( ras, delta, fx1 + first );
+    y1  += delta;
+    ex1 += incr;
+    gray_set_cell( RAS_VAR_ ex1, ey );
+
+    if ( ex1 != ex2 )
+    {
+      TCoord  lift, rem;
+
+
+      p = ONE_PIXEL * dy;
+      FT_DIV_MOD( TCoord, p, dx, lift, rem );
+
+      do
+      {
+        delta = lift;
+        mod  += rem;
+        if ( mod >= (TCoord)dx )
+        {
+          mod -= (TCoord)dx;
+          delta++;
+        }
+
+        FT_INTEGRATE( ras, delta, ONE_PIXEL );
+        y1  += delta;
+        ex1 += incr;
+        gray_set_cell( RAS_VAR_ ex1, ey );
+      } while ( ex1 != ex2 );
+    }
+
+    fx1 = ONE_PIXEL - first;
+
+  End:
+    FT_INTEGRATE( ras, y2 - y1, fx1 + fx2 );
+  }
+
+
+  /**************************************************************************
+   *
+   * Render a given line as a series of scanlines.
+   */
+  static void
+  gray_render_line( RAS_ARG_ TPos  to_x,
+                             TPos  to_y )
+  {
+    TCoord  ey1, ey2, fy1, fy2, first, delta, mod;
+    TPos    p, dx, dy, x, x2;
+    int     incr;
+
+
+    ey1 = TRUNC( ras.y );
+    ey2 = TRUNC( to_y );     /* if (ey2 >= ras.max_ey) ey2 = ras.max_ey-1; */
+
+    /* perform vertical clipping */
+    if ( ( ey1 >= ras.max_ey && ey2 >= ras.max_ey ) ||
+         ( ey1 <  ras.min_ey && ey2 <  ras.min_ey ) )
+      goto End;
+
+    fy1 = FRACT( ras.y );
+    fy2 = FRACT( to_y );
+
+    /* everything is on a single scanline */
+    if ( ey1 == ey2 )
+    {
+      gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, to_x, fy2 );
+      goto End;
+    }
+
+    dx = to_x - ras.x;
+    dy = to_y - ras.y;
+
+    /* vertical line - avoid calling gray_render_scanline */
+    if ( dx == 0 )
+    {
+      TCoord  ex     = TRUNC( ras.x );
+      TCoord  two_fx = FRACT( ras.x ) << 1;
+
+
+      if ( dy > 0)
+      {
+        first = ONE_PIXEL;
+        incr  = 1;
+      }
+      else
+      {
+        first = 0;
+        incr  = -1;
+      }
+
+      delta = first - fy1;
+      FT_INTEGRATE( ras, delta, two_fx);
+      ey1 += incr;
+
+      gray_set_cell( RAS_VAR_ ex, ey1 );
+
+      delta = first + first - ONE_PIXEL;
+      while ( ey1 != ey2 )
+      {
+        FT_INTEGRATE( ras, delta, two_fx);
+        ey1 += incr;
+
+        gray_set_cell( RAS_VAR_ ex, ey1 );
+      }
+
+      delta = fy2 - ONE_PIXEL + first;
+      FT_INTEGRATE( ras, delta, two_fx);
+
+      goto End;
+    }
+
+    /* ok, we have to render several scanlines */
+    if ( dy > 0)
+    {
+      p     = ( ONE_PIXEL - fy1 ) * dx;
+      first = ONE_PIXEL;
+      incr  = 1;
+    }
+    else
+    {
+      p     = fy1 * dx;
+      first = 0;
+      incr  = -1;
+      dy    = -dy;
+    }
+
+    /* the fractional part of x-delta is mod/dy. It is essential to */
+    /* keep track of its accumulation for accurate rendering.       */
+    FT_DIV_MOD( TCoord, p, dy, delta, mod );
+
+    x = ras.x + delta;
+    gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, first );
+
+    ey1 += incr;
+    gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );
+
+    if ( ey1 != ey2 )
+    {
+      TCoord  lift, rem;
+
+
+      p    = ONE_PIXEL * dx;
+      FT_DIV_MOD( TCoord, p, dy, lift, rem );
+
+      do
+      {
+        delta = lift;
+        mod  += rem;
+        if ( mod >= (TCoord)dy )
+        {
+          mod -= (TCoord)dy;
+          delta++;
+        }
+
+        x2 = x + delta;
+        gray_render_scanline( RAS_VAR_ ey1,
+                                       x, ONE_PIXEL - first,
+                                       x2, first );
+        x = x2;
+
+        ey1 += incr;
+        gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );
+      } while ( ey1 != ey2 );
+    }
+
+    gray_render_scanline( RAS_VAR_ ey1,
+                                   x, ONE_PIXEL - first,
+                                   to_x, fy2 );
+
+  End:
+    ras.x       = to_x;
+    ras.y       = to_y;
+  }
+
+#else
+
+  /**************************************************************************
+   *
+   * Render a straight line across multiple cells in any direction.
+   */
+  static void
+  gray_render_line( RAS_ARG_ TPos  to_x,
+                             TPos  to_y )
+  {
+    TPos    dx, dy;
+    TCoord  fx1, fy1, fx2, fy2;
+    TCoord  ex1, ey1, ex2, ey2;
+
+
+    ey1 = TRUNC( ras.y );
+    ey2 = TRUNC( to_y );
+
+    /* perform vertical clipping */
+    if ( ( ey1 >= ras.max_ey && ey2 >= ras.max_ey ) ||
+         ( ey1 <  ras.min_ey && ey2 <  ras.min_ey ) )
+      goto End;
+
+    ex1 = TRUNC( ras.x );
+    ex2 = TRUNC( to_x );
+
+    fx1 = FRACT( ras.x );
+    fy1 = FRACT( ras.y );
+
+    dx = to_x - ras.x;
+    dy = to_y - ras.y;
+
+    if ( ex1 == ex2 && ey1 == ey2 )       /* inside one cell */
+      ;
+    else if ( dy == 0 ) /* ex1 != ex2 */  /* any horizontal line */
+    {
+      gray_set_cell( RAS_VAR_ ex2, ey2 );
+      goto End;
+    }
+    else if ( dx == 0 )
+    {
+      if ( dy > 0 )                       /* vertical line up */
+        do
+        {
+          fy2 = ONE_PIXEL;
+          FT_INTEGRATE( ras, fy2 - fy1, fx1 * 2 );
+          fy1 = 0;
+          ey1++;
+          gray_set_cell( RAS_VAR_ ex1, ey1 );
+        } while ( ey1 != ey2 );
+      else                                /* vertical line down */
+        do
+        {
+          fy2 = 0;
+          FT_INTEGRATE( ras, fy2 - fy1, fx1 * 2 );
+          fy1 = ONE_PIXEL;
+          ey1--;
+          gray_set_cell( RAS_VAR_ ex1, ey1 );
+        } while ( ey1 != ey2 );
+    }
+    else                                  /* any other line */
+    {
+      FT_Int64  prod = dx * (FT_Int64)fy1 - dy * (FT_Int64)fx1;
+      FT_UDIVPREP( ex1 != ex2, dx );
+      FT_UDIVPREP( ey1 != ey2, dy );
+
+
+      /* The fundamental value `prod' determines which side and the  */
+      /* exact coordinate where the line exits current cell.  It is  */
+      /* also easily updated when moving from one cell to the next.  */
+      do
+      {
+        if      ( prod - dx * ONE_PIXEL                  >  0 &&
+                  prod                                   <= 0 ) /* left */
+        {
+          fx2 = 0;
+          fy2 = FT_UDIV( -prod, -dx );
+          prod -= dy * ONE_PIXEL;
+          FT_INTEGRATE( ras, fy2 - fy1, fx1 + fx2 );
+          fx1 = ONE_PIXEL;
+          fy1 = fy2;
+          ex1--;
+        }
+        else if ( prod - dx * ONE_PIXEL + dy * ONE_PIXEL >  0 &&
+                  prod - dx * ONE_PIXEL                  <= 0 ) /* up */
+        {
+          prod -= dx * ONE_PIXEL;
+          fx2 = FT_UDIV( -prod, dy );
+          fy2 = ONE_PIXEL;
+          FT_INTEGRATE( ras, fy2 - fy1, fx1 + fx2 );
+          fx1 = fx2;
+          fy1 = 0;
+          ey1++;
+        }
+        else if ( prod                  + dy * ONE_PIXEL >= 0 &&
+                  prod - dx * ONE_PIXEL + dy * ONE_PIXEL <= 0 ) /* right */
+        {
+          prod += dy * ONE_PIXEL;
+          fx2 = ONE_PIXEL;
+          fy2 = FT_UDIV( prod, dx );
+          FT_INTEGRATE( ras, fy2 - fy1, fx1 + fx2 );
+          fx1 = 0;
+          fy1 = fy2;
+          ex1++;
+        }
+        else /* ( prod                                   >  0 &&
+                  prod                  + dy * ONE_PIXEL <  0 )    down */
+        {
+          fx2 = FT_UDIV( prod, -dy );
+          fy2 = 0;
+          prod += dx * ONE_PIXEL;
+          FT_INTEGRATE( ras, fy2 - fy1, fx1 + fx2 );
+          fx1 = fx2;
+          fy1 = ONE_PIXEL;
+          ey1--;
+        }
+
+        gray_set_cell( RAS_VAR_ ex1, ey1 );
+
+      } while ( ex1 != ex2 || ey1 != ey2 );
+    }
+
+    fx2 = FRACT( to_x );
+    fy2 = FRACT( to_y );
+
+    FT_INTEGRATE( ras, fy2 - fy1, fx1 + fx2 );
+
+  End:
+    ras.x = to_x;
+    ras.y = to_y;
+  }
+
+#endif
+
+  /*
+   * Benchmarking shows that using DDA to flatten the quadratic Bézier arcs
+   * is slightly faster in the following cases:
+   *
+   *   - When the host CPU is 64-bit.
+   *   - When SSE2 SIMD registers and instructions are available (even on
+   *     x86).
+   *
+   * For other cases, using binary splits is actually slightly faster.
+   */
+#if defined( __SSE2__ )                          || \
+    defined( __x86_64__ )                        || \
+    defined( _M_AMD64 )                          || \
+    ( defined( _M_IX86_FP ) && _M_IX86_FP >= 2 )
+#  define FT_SSE2 1
+#else
+#  define FT_SSE2 0
+#endif
+
+#if FT_SSE2                || \
+    defined( __aarch64__ ) || \
+    defined( _M_ARM64 )
+#  define BEZIER_USE_DDA  1
+#else
+#  define BEZIER_USE_DDA  0
+#endif
+
+  /*
+   * For now, the code that depends on `BEZIER_USE_DDA` requires `FT_Int64`
+   * to be defined.  If `FT_INT64` is not defined, meaning there is no
+   * 64-bit type available, disable it to avoid compilation errors.  See for
+   * example https://gitlab.freedesktop.org/freetype/freetype/-/issues/1071.
+   */
+#if !defined( FT_INT64 )
+#  undef BEZIER_USE_DDA
+#  define BEZIER_USE_DDA  0
+#endif
+
+#if BEZIER_USE_DDA
+
+#if FT_SSE2
+#  include <emmintrin.h>
+#endif
+
+#define LEFT_SHIFT( a, b )  (FT_Int64)( (FT_UInt64)(a) << (b) )
+
+
+  static void
+  gray_render_conic( RAS_ARG_ const FT_Vector*  control,
+                              const FT_Vector*  to )
+  {
+    FT_Vector  p0, p1, p2;
+    TPos       ax, ay, bx, by, dx, dy;
+    int        shift;
+
+    FT_Int64  rx, ry;
+    FT_Int64  qx, qy;
+    FT_Int64  px, py;
+
+    FT_UInt  count;
+
+
+    p0.x = ras.x;
+    p0.y = ras.y;
+    p1.x = UPSCALE( control->x );
+    p1.y = UPSCALE( control->y );
+    p2.x = UPSCALE( to->x );
+    p2.y = UPSCALE( to->y );
+
+    /* short-cut the arc that crosses the current band */
+    if ( ( TRUNC( p0.y ) >= ras.max_ey &&
+           TRUNC( p1.y ) >= ras.max_ey &&
+           TRUNC( p2.y ) >= ras.max_ey ) ||
+         ( TRUNC( p0.y ) <  ras.min_ey &&
+           TRUNC( p1.y ) <  ras.min_ey &&
+           TRUNC( p2.y ) <  ras.min_ey ) )
+    {
+      ras.x = p2.x;
+      ras.y = p2.y;
+      return;
+    }
+
+    bx = p1.x - p0.x;
+    by = p1.y - p0.y;
+    ax = p2.x - p1.x - bx;  /* p0.x + p2.x - 2 * p1.x */
+    ay = p2.y - p1.y - by;  /* p0.y + p2.y - 2 * p1.y */
+
+    dx = FT_ABS( ax );
+    dy = FT_ABS( ay );
+    if ( dx < dy )
+      dx = dy;
+
+    if ( dx <= ONE_PIXEL / 4 )
+    {
+      gray_render_line( RAS_VAR_ p2.x, p2.y );
+      return;
+    }
+
+    /* We can calculate the number of necessary bisections because  */
+    /* each bisection predictably reduces deviation exactly 4-fold. */
+    /* Even 32-bit deviation would vanish after 16 bisections.      */
+    shift = 0;
+    do
+    {
+      dx   >>= 2;
+      shift += 1;
+
+    } while ( dx > ONE_PIXEL / 4 );
+
+    /*
+     * The (P0,P1,P2) arc equation, for t in [0,1] range:
+     *
+     * P(t) = P0*(1-t)^2 + P1*2*t*(1-t) + P2*t^2
+     *
+     * P(t) = P0 + 2*(P1-P0)*t + (P0+P2-2*P1)*t^2
+     *      = P0 + 2*B*t + A*t^2
+     *
+     *    for A = P0 + P2 - 2*P1
+     *    and B = P1 - P0
+     *
+     * Let's consider the difference when advancing by a small
+     * parameter h:
+     *
+     *    Q(h,t) = P(t+h) - P(t) = 2*B*h + A*h^2 + 2*A*h*t
+     *
+     * And then its own difference:
+     *
+     *    R(h,t) = Q(h,t+h) - Q(h,t) = 2*A*h*h = R (constant)
+     *
+     * Since R is always a constant, it is possible to compute
+     * successive positions with:
+     *
+     *     P = P0
+     *     Q = Q(h,0) = 2*B*h + A*h*h
+     *     R = 2*A*h*h
+     *
+     *   loop:
+     *     P += Q
+     *     Q += R
+     *     EMIT(P)
+     *
+     * To ensure accurate results, perform computations on 64-bit
+     * values, after scaling them by 2^32.
+     *
+     *           h = 1 / 2^N
+     *
+     *     R << 32 = 2 * A << (32 - N - N)
+     *             = A << (33 - 2*N)
+     *
+     *     Q << 32 = (2 * B << (32 - N)) + (A << (32 - N - N))
+     *             = (B << (33 - N)) + (A << (32 - 2*N))
+     */
+
+#if FT_SSE2
+    /* Experience shows that for small shift values, */
+    /* SSE2 is actually slower.                      */
+    if ( shift > 2 )
+    {
+      union
+      {
+        struct { FT_Int64  ax, ay, bx, by; }  i;
+        struct { __m128i  a, b; }  vec;
+
+      } u;
+
+      union
+      {
+        struct { FT_Int32  px_lo, px_hi, py_lo, py_hi; }  i;
+        __m128i  vec;
+
+      } v;
+
+      __m128i  a, b;
+      __m128i  r, q, q2;
+      __m128i  p;
+
+
+      u.i.ax = ax;
+      u.i.ay = ay;
+      u.i.bx = bx;
+      u.i.by = by;
+
+      a = _mm_load_si128( &u.vec.a );
+      b = _mm_load_si128( &u.vec.b );
+
+      r  = _mm_slli_epi64( a, 33 - 2 * shift );
+      q  = _mm_slli_epi64( b, 33 - shift );
+      q2 = _mm_slli_epi64( a, 32 - 2 * shift );
+
+      q = _mm_add_epi64( q2, q );
+
+      v.i.px_lo = 0;
+      v.i.px_hi = p0.x;
+      v.i.py_lo = 0;
+      v.i.py_hi = p0.y;
+
+      p = _mm_load_si128( &v.vec );
+
+      for ( count = 1U << shift; count > 0; count-- )
+      {
+        p = _mm_add_epi64( p, q );
+        q = _mm_add_epi64( q, r );
+
+        _mm_store_si128( &v.vec, p );
+
+        gray_render_line( RAS_VAR_ v.i.px_hi, v.i.py_hi );
+      }
+
+      return;
+    }
+#endif  /* FT_SSE2 */
+
+    rx = LEFT_SHIFT( ax, 33 - 2 * shift );
+    ry = LEFT_SHIFT( ay, 33 - 2 * shift );
+
+    qx = LEFT_SHIFT( bx, 33 - shift ) + LEFT_SHIFT( ax, 32 - 2 * shift );
+    qy = LEFT_SHIFT( by, 33 - shift ) + LEFT_SHIFT( ay, 32 - 2 * shift );
+
+    px = LEFT_SHIFT( p0.x, 32 );
+    py = LEFT_SHIFT( p0.y, 32 );
+
+    for ( count = 1U << shift; count > 0; count-- )
+    {
+      px += qx;
+      py += qy;
+      qx += rx;
+      qy += ry;
+
+      gray_render_line( RAS_VAR_ (FT_Pos)( px >> 32 ),
+                                 (FT_Pos)( py >> 32 ) );
+    }
+  }
+
+#else  /* !BEZIER_USE_DDA */
+
+  /*
+   * Note that multiple attempts to speed up the function below
+   * with SSE2 intrinsics, using various data layouts, have turned
+   * out to be slower than the non-SIMD code below.
+   */
+  static void
+  gray_split_conic( FT_Vector*  base )
+  {
+    TPos  a, b;
+
+
+    base[4].x = base[2].x;
+    a = base[0].x + base[1].x;
+    b = base[1].x + base[2].x;
+    base[3].x = b >> 1;
+    base[2].x = ( a + b ) >> 2;
+    base[1].x = a >> 1;
+
+    base[4].y = base[2].y;
+    a = base[0].y + base[1].y;
+    b = base[1].y + base[2].y;
+    base[3].y = b >> 1;
+    base[2].y = ( a + b ) >> 2;
+    base[1].y = a >> 1;
+  }
+
+
+  static void
+  gray_render_conic( RAS_ARG_ const FT_Vector*  control,
+                              const FT_Vector*  to )
+  {
+    FT_Vector   bez_stack[16 * 2 + 1];  /* enough to accommodate bisections */
+    FT_Vector*  arc = bez_stack;
+    TPos        dx, dy;
+    int         draw;
+
+
+    arc[0].x = UPSCALE( to->x );
+    arc[0].y = UPSCALE( to->y );
+    arc[1].x = UPSCALE( control->x );
+    arc[1].y = UPSCALE( control->y );
+    arc[2].x = ras.x;
+    arc[2].y = ras.y;
+
+    /* short-cut the arc that crosses the current band */
+    if ( ( TRUNC( arc[0].y ) >= ras.max_ey &&
+           TRUNC( arc[1].y ) >= ras.max_ey &&
+           TRUNC( arc[2].y ) >= ras.max_ey ) ||
+         ( TRUNC( arc[0].y ) <  ras.min_ey &&
+           TRUNC( arc[1].y ) <  ras.min_ey &&
+           TRUNC( arc[2].y ) <  ras.min_ey ) )
+    {
+      ras.x = arc[0].x;
+      ras.y = arc[0].y;
+      return;
+    }
+
+    dx = FT_ABS( arc[2].x + arc[0].x - 2 * arc[1].x );
+    dy = FT_ABS( arc[2].y + arc[0].y - 2 * arc[1].y );
+    if ( dx < dy )
+      dx = dy;
+
+    /* We can calculate the number of necessary bisections because  */
+    /* each bisection predictably reduces deviation exactly 4-fold. */
+    /* Even 32-bit deviation would vanish after 16 bisections.      */
+    draw = 1;
+    while ( dx > ONE_PIXEL / 4 )
+    {
+      dx   >>= 2;
+      draw <<= 1;
+    }
+
+    /* We use decrement counter to count the total number of segments */
+    /* to draw starting from 2^level. Before each draw we split as    */
+    /* many times as there are trailing zeros in the counter.         */
+    do
+    {
+      int  split = draw & ( -draw );  /* isolate the rightmost 1-bit */
+
+
+      while ( ( split >>= 1 ) )
+      {
+        gray_split_conic( arc );
+        arc += 2;
+      }
+
+      gray_render_line( RAS_VAR_ arc[0].x, arc[0].y );
+      arc -= 2;
+
+    } while ( --draw );
+  }
+
+#endif  /* !BEZIER_USE_DDA */
+
+
+  /*
+   * For cubic Bézier, binary splits are still faster than DDA
+   * because the splits are adaptive to how quickly each sub-arc
+   * approaches their chord trisection points.
+   *
+   * It might be useful to experiment with SSE2 to speed up
+   * `gray_split_cubic`, though.
+   */
+  static void
+  gray_split_cubic( FT_Vector*  base )
+  {
+    TPos  a, b, c;
+
+
+    base[6].x = base[3].x;
+    a = base[0].x + base[1].x;
+    b = base[1].x + base[2].x;
+    c = base[2].x + base[3].x;
+    base[5].x = c >> 1;
+    c += b;
+    base[4].x = c >> 2;
+    base[1].x = a >> 1;
+    a += b;
+    base[2].x = a >> 2;
+    base[3].x = ( a + c ) >> 3;
+
+    base[6].y = base[3].y;
+    a = base[0].y + base[1].y;
+    b = base[1].y + base[2].y;
+    c = base[2].y + base[3].y;
+    base[5].y = c >> 1;
+    c += b;
+    base[4].y = c >> 2;
+    base[1].y = a >> 1;
+    a += b;
+    base[2].y = a >> 2;
+    base[3].y = ( a + c ) >> 3;
+  }
+
+
+  static void
+  gray_render_cubic( RAS_ARG_ const FT_Vector*  control1,
+                              const FT_Vector*  control2,
+                              const FT_Vector*  to )
+  {
+    FT_Vector   bez_stack[16 * 3 + 1];  /* enough to accommodate bisections */
+    FT_Vector*  arc = bez_stack;
+
+
+    arc[0].x = UPSCALE( to->x );
+    arc[0].y = UPSCALE( to->y );
+    arc[1].x = UPSCALE( control2->x );
+    arc[1].y = UPSCALE( control2->y );
+    arc[2].x = UPSCALE( control1->x );
+    arc[2].y = UPSCALE( control1->y );
+    arc[3].x = ras.x;
+    arc[3].y = ras.y;
+
+    /* short-cut the arc that crosses the current band */
+    if ( ( TRUNC( arc[0].y ) >= ras.max_ey &&
+           TRUNC( arc[1].y ) >= ras.max_ey &&
+           TRUNC( arc[2].y ) >= ras.max_ey &&
+           TRUNC( arc[3].y ) >= ras.max_ey ) ||
+         ( TRUNC( arc[0].y ) <  ras.min_ey &&
+           TRUNC( arc[1].y ) <  ras.min_ey &&
+           TRUNC( arc[2].y ) <  ras.min_ey &&
+           TRUNC( arc[3].y ) <  ras.min_ey ) )
+    {
+      ras.x = arc[0].x;
+      ras.y = arc[0].y;
+      return;
+    }
+
+    for (;;)
+    {
+      /* with each split, control points quickly converge towards  */
+      /* chord trisection points and the vanishing distances below */
+      /* indicate when the segment is flat enough to draw          */
+      if ( FT_ABS( 2 * arc[0].x - 3 * arc[1].x + arc[3].x ) > ONE_PIXEL / 2 ||
+           FT_ABS( 2 * arc[0].y - 3 * arc[1].y + arc[3].y ) > ONE_PIXEL / 2 ||
+           FT_ABS( arc[0].x - 3 * arc[2].x + 2 * arc[3].x ) > ONE_PIXEL / 2 ||
+           FT_ABS( arc[0].y - 3 * arc[2].y + 2 * arc[3].y ) > ONE_PIXEL / 2 )
+        goto Split;
+
+      gray_render_line( RAS_VAR_ arc[0].x, arc[0].y );
+
+      if ( arc == bez_stack )
+        return;
+
+      arc -= 3;
+      continue;
+
+    Split:
+      gray_split_cubic( arc );
+      arc += 3;
+    }
+  }
+
+
+  static int
+  gray_move_to( const FT_Vector*  to,
+                gray_PWorker      worker )
+  {
+    TPos  x, y;
+
+
+    /* start to a new position */
+    x = UPSCALE( to->x );
+    y = UPSCALE( to->y );
+
+    gray_set_cell( RAS_VAR_ TRUNC( x ), TRUNC( y ) );
+
+    ras.x = x;
+    ras.y = y;
+    return 0;
+  }
+
+
+  static int
+  gray_line_to( const FT_Vector*  to,
+                gray_PWorker      worker )
+  {
+    gray_render_line( RAS_VAR_ UPSCALE( to->x ), UPSCALE( to->y ) );
+    return 0;
+  }
+
+
+  static int
+  gray_conic_to( const FT_Vector*  control,
+                 const FT_Vector*  to,
+                 gray_PWorker      worker )
+  {
+    gray_render_conic( RAS_VAR_ control, to );
+    return 0;
+  }
+
+
+  static int
+  gray_cubic_to( const FT_Vector*  control1,
+                 const FT_Vector*  control2,
+                 const FT_Vector*  to,
+                 gray_PWorker      worker )
+  {
+    gray_render_cubic( RAS_VAR_ control1, control2, to );
+    return 0;
+  }
+
+
+  static void
+  gray_sweep( RAS_ARG )
+  {
+    int  fill = ( ras.outline.flags & FT_OUTLINE_EVEN_ODD_FILL ) ? 0x100
+                                                                 : INT_MIN;
+    int  coverage;
+    int  y;
+
+
+    for ( y = ras.min_ey; y < ras.max_ey; y++ )
+    {
+      PCell   cell  = ras.ycells[y - ras.min_ey];
+      TCoord  x     = ras.min_ex;
+      TArea   cover = 0;
+
+      unsigned char*  line = ras.target.origin - ras.target.pitch * y;
+
+
+      for ( ; cell != ras.cell_null; cell = cell->next )
+      {
+        TArea  area;
+
+
+        if ( cover != 0 && cell->x > x )
+        {
+          FT_FILL_RULE( coverage, cover, fill );
+          FT_GRAY_SET( line + x, coverage, cell->x - x );
+        }
+
+        cover += (TArea)cell->cover * ( ONE_PIXEL * 2 );
+        area   = cover - cell->area;
+
+        if ( area != 0 && cell->x >= ras.min_ex )
+        {
+          FT_FILL_RULE( coverage, area, fill );
+          line[cell->x] = (unsigned char)coverage;
+        }
+
+        x = cell->x + 1;
+      }
+
+      if ( cover != 0 )  /* only if cropped */
+      {
+        FT_FILL_RULE( coverage, cover, fill );
+        FT_GRAY_SET( line + x, coverage, ras.max_ex - x );
+      }
+    }
+  }
+
+
+  static void
+  gray_sweep_direct( RAS_ARG )
+  {
+    int  fill = ( ras.outline.flags & FT_OUTLINE_EVEN_ODD_FILL ) ? 0x100
+                                                                 : INT_MIN;
+    int  coverage;
+    int  y;
+
+    FT_Span  span[FT_MAX_GRAY_SPANS];
+    int      n = 0;
+
+
+    for ( y = ras.min_ey; y < ras.max_ey; y++ )
+    {
+      PCell   cell  = ras.ycells[y - ras.min_ey];
+      TCoord  x     = ras.min_ex;
+      TArea   cover = 0;
+
+
+      for ( ; cell != ras.cell_null; cell = cell->next )
+      {
+        TArea  area;
+
+
+        if ( cover != 0 && cell->x > x )
+        {
+          FT_FILL_RULE( coverage, cover, fill );
+
+          span[n].coverage = (unsigned char)coverage;
+          span[n].x        = (short)x;
+          span[n].len      = (unsigned short)( cell->x - x );
+
+          if ( ++n == FT_MAX_GRAY_SPANS )
+          {
+            /* flush the span buffer and reset the count */
+            ras.render_span( y, n, span, ras.render_span_data );
+            n = 0;
+          }
+        }
+
+        cover += (TArea)cell->cover * ( ONE_PIXEL * 2 );
+        area   = cover - cell->area;
+
+        if ( area != 0 && cell->x >= ras.min_ex )
+        {
+          FT_FILL_RULE( coverage, area, fill );
+
+          span[n].coverage = (unsigned char)coverage;
+          span[n].x        = (short)cell->x;
+          span[n].len      = 1;
+
+          if ( ++n == FT_MAX_GRAY_SPANS )
+          {
+            /* flush the span buffer and reset the count */
+            ras.render_span( y, n, span, ras.render_span_data );
+            n = 0;
+          }
+        }
+
+        x = cell->x + 1;
+      }
+
+      if ( cover != 0 )  /* only if cropped */
+      {
+        FT_FILL_RULE( coverage, cover, fill );
+
+        span[n].coverage = (unsigned char)coverage;
+        span[n].x        = (short)x;
+        span[n].len      = (unsigned short)( ras.max_ex - x );
+
+        ++n;
+      }
+
+      if ( n )
+      {
+        /* flush the span buffer and reset the count */
+        ras.render_span( y, n, span, ras.render_span_data );
+        n = 0;
+      }
+    }
+  }
+
+
+#ifdef STANDALONE_
+
+  /**************************************************************************
+   *
+   * The following functions should only compile in stand-alone mode,
+   * i.e., when building this component without the rest of FreeType.
+   *
+   */
+
+  /**************************************************************************
+   *
+   * @Function:
+   *   FT_Outline_Decompose
+   *
+   * @Description:
+   *   Walk over an outline's structure to decompose it into individual
+   *   segments and Bézier arcs.  This function is also able to emit
+   *   `move to' and `close to' operations to indicate the start and end
+   *   of new contours in the outline.
+   *
+   * @Input:
+   *   outline ::
+   *     A pointer to the source target.
+   *
+   *   func_interface ::
+   *     A table of `emitters', i.e., function pointers
+   *     called during decomposition to indicate path
+   *     operations.
+   *
+   * @InOut:
+   *   user ::
+   *     A typeless pointer which is passed to each
+   *     emitter during the decomposition.  It can be
+   *     used to store the state during the
+   *     decomposition.
+   *
+   * @Return:
+   *   Error code.  0 means success.
+   */
+  static int
+  FT_Outline_Decompose( const FT_Outline*        outline,
+                        const FT_Outline_Funcs*  func_interface,
+                        void*                    user )
+  {
+#undef SCALED
+#define SCALED( x )  ( (x) * ( 1L << shift ) - delta )
+
+    FT_Vector   v_last;
+    FT_Vector   v_control;
+    FT_Vector   v_start;
+
+    FT_Vector*  point;
+    FT_Vector*  limit;
+    char*       tags;
+
+    int         error;
+
+    int   n;         /* index of contour in outline     */
+    int   first;     /* index of first point in contour */
+    char  tag;       /* current point's state           */
+
+    int   shift;
+    TPos  delta;
+
+
+    if ( !outline )
+      return FT_THROW( Invalid_Outline );
+
+    if ( !func_interface )
+      return FT_THROW( Invalid_Argument );
+
+    shift = func_interface->shift;
+    delta = func_interface->delta;
+    first = 0;
+
+    for ( n = 0; n < outline->n_contours; n++ )
+    {
+      int  last;  /* index of last point in contour */
+
+
+      FT_TRACE5(( "FT_Outline_Decompose: Outline %d\n", n ));
+
+      last  = outline->contours[n];
+      if ( last < 0 )
+        goto Invalid_Outline;
+      limit = outline->points + last;
+
+      v_start   = outline->points[first];
+      v_start.x = SCALED( v_start.x );
+      v_start.y = SCALED( v_start.y );
+
+      v_last   = outline->points[last];
+      v_last.x = SCALED( v_last.x );
+      v_last.y = SCALED( v_last.y );
+
+      v_control = v_start;
+
+      point = outline->points + first;
+      tags  = outline->tags   + first;
+      tag   = FT_CURVE_TAG( tags[0] );
+
+      /* A contour cannot start with a cubic control point! */
+      if ( tag == FT_CURVE_TAG_CUBIC )
+        goto Invalid_Outline;
+
+      /* check first point to determine origin */
+      if ( tag == FT_CURVE_TAG_CONIC )
+      {
+        /* first point is conic control.  Yes, this happens. */
+        if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )
+        {
+          /* start at last point if it is on the curve */
+          v_start = v_last;
+          limit--;
+        }
+        else
+        {
+          /* if both first and last points are conic,         */
+          /* start at their middle and record its position    */
+          /* for closure                                      */
+          v_start.x = ( v_start.x + v_last.x ) / 2;
+          v_start.y = ( v_start.y + v_last.y ) / 2;
+
+          v_last = v_start;
+        }
+        point--;
+        tags--;
+      }
+
+      FT_TRACE5(( "  move to (%.2f, %.2f)\n",
+                  v_start.x / 64.0, v_start.y / 64.0 ));
+      error = func_interface->move_to( &v_start, user );
+      if ( error )
+        goto Exit;
+
+      while ( point < limit )
+      {
+        point++;
+        tags++;
+
+        tag = FT_CURVE_TAG( tags[0] );
+        switch ( tag )
+        {
+        case FT_CURVE_TAG_ON:  /* emit a single line_to */
+          {
+            FT_Vector  vec;
+
+
+            vec.x = SCALED( point->x );
+            vec.y = SCALED( point->y );
+
+            FT_TRACE5(( "  line to (%.2f, %.2f)\n",
+                        vec.x / 64.0, vec.y / 64.0 ));
+            error = func_interface->line_to( &vec, user );
+            if ( error )
+              goto Exit;
+            continue;
+          }
+
+        case FT_CURVE_TAG_CONIC:  /* consume conic arcs */
+          v_control.x = SCALED( point->x );
+          v_control.y = SCALED( point->y );
+
+        Do_Conic:
+          if ( point < limit )
+          {
+            FT_Vector  vec;
+            FT_Vector  v_middle;
+
+
+            point++;
+            tags++;
+            tag = FT_CURVE_TAG( tags[0] );
+
+            vec.x = SCALED( point->x );
+            vec.y = SCALED( point->y );
+
+            if ( tag == FT_CURVE_TAG_ON )
+            {
+              FT_TRACE5(( "  conic to (%.2f, %.2f)"
+                          " with control (%.2f, %.2f)\n",
+                          vec.x / 64.0, vec.y / 64.0,
+                          v_control.x / 64.0, v_control.y / 64.0 ));
+              error = func_interface->conic_to( &v_control, &vec, user );
+              if ( error )
+                goto Exit;
+              continue;
+            }
+
+            if ( tag != FT_CURVE_TAG_CONIC )
+              goto Invalid_Outline;
+
+            v_middle.x = ( v_control.x + vec.x ) / 2;
+            v_middle.y = ( v_control.y + vec.y ) / 2;
+
+            FT_TRACE5(( "  conic to (%.2f, %.2f)"
+                        " with control (%.2f, %.2f)\n",
+                        v_middle.x / 64.0, v_middle.y / 64.0,
+                        v_control.x / 64.0, v_control.y / 64.0 ));
+            error = func_interface->conic_to( &v_control, &v_middle, user );
+            if ( error )
+              goto Exit;
+
+            v_control = vec;
+            goto Do_Conic;
+          }
+
+          FT_TRACE5(( "  conic to (%.2f, %.2f)"
+                      " with control (%.2f, %.2f)\n",
+                      v_start.x / 64.0, v_start.y / 64.0,
+                      v_control.x / 64.0, v_control.y / 64.0 ));
+          error = func_interface->conic_to( &v_control, &v_start, user );
+          goto Close;
+
+        default:  /* FT_CURVE_TAG_CUBIC */
+          {
+            FT_Vector  vec1, vec2;
+
+
+            if ( point + 1 > limit                             ||
+                 FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )
+              goto Invalid_Outline;
+
+            point += 2;
+            tags  += 2;
+
+            vec1.x = SCALED( point[-2].x );
+            vec1.y = SCALED( point[-2].y );
+
+            vec2.x = SCALED( point[-1].x );
+            vec2.y = SCALED( point[-1].y );
+
+            if ( point <= limit )
+            {
+              FT_Vector  vec;
+
+
+              vec.x = SCALED( point->x );
+              vec.y = SCALED( point->y );
+
+              FT_TRACE5(( "  cubic to (%.2f, %.2f)"
+                          " with controls (%.2f, %.2f) and (%.2f, %.2f)\n",
+                          vec.x / 64.0, vec.y / 64.0,
+                          vec1.x / 64.0, vec1.y / 64.0,
+                          vec2.x / 64.0, vec2.y / 64.0 ));
+              error = func_interface->cubic_to( &vec1, &vec2, &vec, user );
+              if ( error )
+                goto Exit;
+              continue;
+            }
+
+            FT_TRACE5(( "  cubic to (%.2f, %.2f)"
+                        " with controls (%.2f, %.2f) and (%.2f, %.2f)\n",
+                        v_start.x / 64.0, v_start.y / 64.0,
+                        vec1.x / 64.0, vec1.y / 64.0,
+                        vec2.x / 64.0, vec2.y / 64.0 ));
+            error = func_interface->cubic_to( &vec1, &vec2, &v_start, user );
+            goto Close;
+          }
+        }
+      }
+
+      /* close the contour with a line segment */
+      FT_TRACE5(( "  line to (%.2f, %.2f)\n",
+                  v_start.x / 64.0, v_start.y / 64.0 ));
+      error = func_interface->line_to( &v_start, user );
+
+   Close:
+      if ( error )
+        goto Exit;
+
+      first = last + 1;
+    }
+
+    FT_TRACE5(( "FT_Outline_Decompose: Done\n", n ));
+    return Smooth_Err_Ok;
+
+  Exit:
+    FT_TRACE5(( "FT_Outline_Decompose: Error 0x%x\n", error ));
+    return error;
+
+  Invalid_Outline:
+    return FT_THROW( Invalid_Outline );
+  }
+
+#endif /* STANDALONE_ */
+
+
+  FT_DEFINE_OUTLINE_FUNCS(
+    func_interface,
+
+    (FT_Outline_MoveTo_Func) gray_move_to,   /* move_to  */
+    (FT_Outline_LineTo_Func) gray_line_to,   /* line_to  */
+    (FT_Outline_ConicTo_Func)gray_conic_to,  /* conic_to */
+    (FT_Outline_CubicTo_Func)gray_cubic_to,  /* cubic_to */
+
+    0,                                       /* shift    */
+    0                                        /* delta    */
+  )
+
+
+  static int
+  gray_convert_glyph_inner( RAS_ARG_
+                            int  continued )
+  {
+    volatile int  error;
+
+
+    if ( ft_setjmp( ras.jump_buffer ) == 0 )
+    {
+      if ( continued )
+        FT_Trace_Disable();
+      error = FT_Outline_Decompose( &ras.outline, &func_interface, &ras );
+      if ( continued )
+        FT_Trace_Enable();
+
+      FT_TRACE7(( "band [%d..%d]: %ld cell%s remaining/\n",
+                  ras.min_ey,
+                  ras.max_ey,
+                  ras.cell_null - ras.cell_free,
+                  ras.cell_null - ras.cell_free == 1 ? "" : "s" ));
+    }
+    else
+    {
+      error = FT_THROW( Raster_Overflow );
+
+      FT_TRACE7(( "band [%d..%d]: to be bisected\n",
+                  ras.min_ey, ras.max_ey ));
+    }
+
+    return error;
+  }
+
+
+  static int
+  gray_convert_glyph( RAS_ARG )
+  {
+    const TCoord  yMin = ras.min_ey;
+    const TCoord  yMax = ras.max_ey;
+
+    TCell    buffer[FT_MAX_GRAY_POOL];
+    size_t   height = (size_t)( yMax - yMin );
+    size_t   n = FT_MAX_GRAY_POOL / 8;
+    TCoord   y;
+    TCoord   bands[32];  /* enough to accommodate bisections */
+    TCoord*  band;
+
+    int  continued = 0;
+
+
+    /* Initialize the null cell at the end of the poll. */
+    ras.cell_null        = buffer + FT_MAX_GRAY_POOL - 1;
+    ras.cell_null->x     = CELL_MAX_X_VALUE;
+    ras.cell_null->area  = 0;
+    ras.cell_null->cover = 0;
+    ras.cell_null->next  = NULL;
+
+    /* set up vertical bands */
+    ras.ycells     = (PCell*)buffer;
+
+    if ( height > n )
+    {
+      /* two divisions rounded up */
+      n       = ( height + n - 1 ) / n;
+      height  = ( height + n - 1 ) / n;
+    }
+
+    for ( y = yMin; y < yMax; )
+    {
+      ras.min_ey = y;
+      y         += height;
+      ras.max_ey = FT_MIN( y, yMax );
+
+      band    = bands;
+      band[1] = ras.min_ey;
+      band[0] = ras.max_ey;
+
+      do
+      {
+        TCoord  width = band[0] - band[1];
+        TCoord  w;
+        int     error;
+
+
+        for ( w = 0; w < width; ++w )
+          ras.ycells[w] = ras.cell_null;
+
+        /* memory management: skip ycells */
+        n = ( (size_t)width * sizeof ( PCell ) + sizeof ( TCell ) - 1 ) /
+              sizeof ( TCell );
+
+        ras.cell_free = buffer + n;
+        ras.cell      = ras.cell_null;
+        ras.min_ey    = band[1];
+        ras.max_ey    = band[0];
+        ras.count_ey  = width;
+
+        error     = gray_convert_glyph_inner( RAS_VAR_ continued );
+        continued = 1;
+
+        if ( !error )
+        {
+          if ( ras.render_span )  /* for FT_RASTER_FLAG_DIRECT only */
+            gray_sweep_direct( RAS_VAR );
+          else
+            gray_sweep( RAS_VAR );
+          band--;
+          continue;
+        }
+        else if ( error != Smooth_Err_Raster_Overflow )
+          return error;
+
+        /* render pool overflow; we will reduce the render band by half */
+        width >>= 1;
+
+        /* this should never happen even with tiny rendering pool */
+        if ( width == 0 )
+        {
+          FT_TRACE7(( "gray_convert_glyph: rotten glyph\n" ));
+          return FT_THROW( Raster_Overflow );
+        }
+
+        band++;
+        band[1]  = band[0];
+        band[0] += width;
+      } while ( band >= bands );
+    }
+
+    return Smooth_Err_Ok;
+  }
+
+
+  static int
+  gray_raster_render( FT_Raster                raster,
+                      const FT_Raster_Params*  params )
+  {
+    const FT_Outline*  outline    = (const FT_Outline*)params->source;
+    const FT_Bitmap*   target_map = params->target;
+
+#ifndef FT_STATIC_RASTER
+    gray_TWorker  worker[1];
+#endif
+
+
+    if ( !raster )
+      return FT_THROW( Invalid_Argument );
+
+    /* this version does not support monochrome rendering */
+    if ( !( params->flags & FT_RASTER_FLAG_AA ) )
+      return FT_THROW( Cannot_Render_Glyph );
+
+    if ( !outline )
+      return FT_THROW( Invalid_Outline );
+
+    /* return immediately if the outline is empty */
+    if ( outline->n_points == 0 || outline->n_contours <= 0 )
+      return Smooth_Err_Ok;
+
+    if ( !outline->contours || !outline->points )
+      return FT_THROW( Invalid_Outline );
+
+    if ( outline->n_points !=
+           outline->contours[outline->n_contours - 1] + 1 )
+      return FT_THROW( Invalid_Outline );
+
+    ras.outline = *outline;
+
+    if ( params->flags & FT_RASTER_FLAG_DIRECT )
+    {
+      if ( !params->gray_spans )
+        return Smooth_Err_Ok;
+
+      ras.render_span      = (FT_Raster_Span_Func)params->gray_spans;
+      ras.render_span_data = params->user;
+
+      ras.min_ex = params->clip_box.xMin;
+      ras.min_ey = params->clip_box.yMin;
+      ras.max_ex = params->clip_box.xMax;
+      ras.max_ey = params->clip_box.yMax;
+    }
+    else
+    {
+      /* if direct mode is not set, we must have a target bitmap */
+      if ( !target_map )
+        return FT_THROW( Invalid_Argument );
+
+      /* nothing to do */
+      if ( !target_map->width || !target_map->rows )
+        return Smooth_Err_Ok;
+
+      if ( !target_map->buffer )
+        return FT_THROW( Invalid_Argument );
+
+      if ( target_map->pitch < 0 )
+        ras.target.origin = target_map->buffer;
+      else
+        ras.target.origin = target_map->buffer
+              + ( target_map->rows - 1 ) * (unsigned int)target_map->pitch;
+
+      ras.target.pitch = target_map->pitch;
+
+      ras.render_span      = (FT_Raster_Span_Func)NULL;
+      ras.render_span_data = NULL;
+
+      ras.min_ex = 0;
+      ras.min_ey = 0;
+      ras.max_ex = (FT_Pos)target_map->width;
+      ras.max_ey = (FT_Pos)target_map->rows;
+    }
+
+    /* exit if nothing to do */
+    if ( ras.max_ex <= ras.min_ex || ras.max_ey <= ras.min_ey )
+      return Smooth_Err_Ok;
+
+    return gray_convert_glyph( RAS_VAR );
+  }
+
+
+  /**** RASTER OBJECT CREATION: In stand-alone mode, we simply use *****/
+  /****                         a static object.                   *****/
+
+#ifdef STANDALONE_
+
+  static int
+  gray_raster_new( void*       memory,
+                   FT_Raster*  araster )
+  {
+    static gray_TRaster  the_raster;
+
+    FT_UNUSED( memory );
+
+
+    *araster = (FT_Raster)&the_raster;
+    FT_ZERO( &the_raster );
+
+    return 0;
+  }
+
+
+  static void
+  gray_raster_done( FT_Raster  raster )
+  {
+    /* nothing */
+    FT_UNUSED( raster );
+  }
+
+#else /* !STANDALONE_ */
+
+  static int
+  gray_raster_new( FT_Memory      memory,
+                   gray_PRaster*  araster )
+  {
+    FT_Error      error;
+    gray_PRaster  raster = NULL;
+
+
+    if ( !FT_NEW( raster ) )
+      raster->memory = memory;
+
+    *araster = raster;
+
+    return error;
+  }
+
+
+  static void
+  gray_raster_done( FT_Raster  raster )
+  {
+    FT_Memory  memory = (FT_Memory)((gray_PRaster)raster)->memory;
+
+
+    FT_FREE( raster );
+  }
+
+#endif /* !STANDALONE_ */
+
+
+  static void
+  gray_raster_reset( FT_Raster       raster,
+                     unsigned char*  pool_base,
+                     unsigned long   pool_size )
+  {
+    FT_UNUSED( raster );
+    FT_UNUSED( pool_base );
+    FT_UNUSED( pool_size );
+  }
+
+
+  static int
+  gray_raster_set_mode( FT_Raster      raster,
+                        unsigned long  mode,
+                        void*          args )
+  {
+    FT_UNUSED( raster );
+    FT_UNUSED( mode );
+    FT_UNUSED( args );
+
+
+    return 0; /* nothing to do */
+  }
+
+
+  FT_DEFINE_RASTER_FUNCS(
+    ft_grays_raster,
+
+    FT_GLYPH_FORMAT_OUTLINE,
+
+    (FT_Raster_New_Func)     gray_raster_new,       /* raster_new      */
+    (FT_Raster_Reset_Func)   gray_raster_reset,     /* raster_reset    */
+    (FT_Raster_Set_Mode_Func)gray_raster_set_mode,  /* raster_set_mode */
+    (FT_Raster_Render_Func)  gray_raster_render,    /* raster_render   */
+    (FT_Raster_Done_Func)    gray_raster_done       /* raster_done     */
+  )
+
+
+/* END */
+
+
+/* Local Variables: */
+/* coding: utf-8    */
+/* End:             */
diff --git a/modules/freetype2/src/smooth/ftgrays.h b/modules/freetype2/src/smooth/ftgrays.h
new file mode 100644
index 0000000000..a5001bf40d
--- /dev/null
+++ b/modules/freetype2/src/smooth/ftgrays.h
@@ -0,0 +1,57 @@
+/****************************************************************************
+ *
+ * ftgrays.h
+ *
+ *   FreeType smooth renderer declaration
+ *
+ * Copyright (C) 1996-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * 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 FTGRAYS_H_
+#define FTGRAYS_H_
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+
+#ifdef STANDALONE_
+#include "ftimage.h"
+#else
+#include <ft2build.h>
+#include <freetype/ftimage.h>
+#endif
+
+
+  /**************************************************************************
+   *
+   * To make ftgrays.h independent from configuration files we check
+   * whether FT_EXPORT_VAR has been defined already.
+   *
+   * On some systems and compilers (Win32 mostly), an extra keyword is
+   * necessary to compile the library as a DLL.
+   */
+#ifndef FT_EXPORT_VAR
+#define FT_EXPORT_VAR( x )  extern  x
+#endif
+
+  FT_EXPORT_VAR( const FT_Raster_Funcs )  ft_grays_raster;
+
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif /* FTGRAYS_H_ */
+
+
+/* END */
diff --git a/modules/freetype2/src/smooth/ftsmerrs.h b/modules/freetype2/src/smooth/ftsmerrs.h
new file mode 100644
index 0000000000..f4ac93dc41
--- /dev/null
+++ b/modules/freetype2/src/smooth/ftsmerrs.h
@@ -0,0 +1,42 @@
+/****************************************************************************
+ *
+ * ftsmerrs.h
+ *
+ *   smooth renderer error codes (specification only).
+ *
+ * Copyright (C) 2001-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * 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.
+ *
+ */
+
+
+  /**************************************************************************
+   *
+   * This file is used to define the smooth renderer error enumeration
+   * constants.
+   *
+   */
+
+#ifndef FTSMERRS_H_
+#define FTSMERRS_H_
+
+#include <freetype/ftmoderr.h>
+
+#undef FTERRORS_H_
+
+#undef  FT_ERR_PREFIX
+#define FT_ERR_PREFIX  Smooth_Err_
+#define FT_ERR_BASE    FT_Mod_Err_Smooth
+
+#include <freetype/fterrors.h>
+
+#endif /* FTSMERRS_H_ */
+
+
+/* END */
diff --git a/modules/freetype2/src/smooth/ftsmooth.c b/modules/freetype2/src/smooth/ftsmooth.c
new file mode 100644
index 0000000000..cdbc78c3e5
--- /dev/null
+++ b/modules/freetype2/src/smooth/ftsmooth.c
@@ -0,0 +1,595 @@
+/****************************************************************************
+ *
+ * ftsmooth.c
+ *
+ *   Anti-aliasing renderer interface (body).
+ *
+ * Copyright (C) 2000-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * 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.
+ *
+ */
+
+
+#include <freetype/internal/ftdebug.h>
+#include <freetype/internal/ftobjs.h>
+#include <freetype/ftoutln.h>
+#include "ftsmooth.h"
+#include "ftgrays.h"
+
+#include "ftsmerrs.h"
+
+
+  /* sets render-specific mode */
+  static FT_Error
+  ft_smooth_set_mode( FT_Renderer  render,
+                      FT_ULong     mode_tag,
+                      FT_Pointer   data )
+  {
+    /* we simply pass it to the raster */
+    return render->clazz->raster_class->raster_set_mode( render->raster,
+                                                         mode_tag,
+                                                         data );
+  }
+
+  /* transform a given glyph image */
+  static FT_Error
+  ft_smooth_transform( FT_Renderer       render,
+                       FT_GlyphSlot      slot,
+                       const FT_Matrix*  matrix,
+                       const FT_Vector*  delta )
+  {
+    FT_Error  error = FT_Err_Ok;
+
+
+    if ( slot->format != render->glyph_format )
+    {
+      error = FT_THROW( Invalid_Argument );
+      goto Exit;
+    }
+
+    if ( matrix )
+      FT_Outline_Transform( &slot->outline, matrix );
+
+    if ( delta )
+      FT_Outline_Translate( &slot->outline, delta->x, delta->y );
+
+  Exit:
+    return error;
+  }
+
+
+  /* return the glyph's control box */
+  static void
+  ft_smooth_get_cbox( FT_Renderer   render,
+                      FT_GlyphSlot  slot,
+                      FT_BBox*      cbox )
+  {
+    FT_ZERO( cbox );
+
+    if ( slot->format == render->glyph_format )
+      FT_Outline_Get_CBox( &slot->outline, cbox );
+  }
+
+  typedef struct TOrigin_
+  {
+    unsigned char*  origin;  /* pixmap origin at the bottom-left */
+    int             pitch;   /* pitch to go down one row */
+
+  } TOrigin;
+
+#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
+
+  /* initialize renderer -- init its raster */
+  static FT_Error
+  ft_smooth_init( FT_Renderer  render )
+  {
+    FT_Vector*  sub = render->root.library->lcd_geometry;
+
+
+    /* set up default subpixel geometry for striped RGB panels. */
+    sub[0].x = -21;
+    sub[0].y = 0;
+    sub[1].x = 0;
+    sub[1].y = 0;
+    sub[2].x = 21;
+    sub[2].y = 0;
+
+    render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
+
+    return 0;
+  }
+
+
+  /* This function writes every third byte in direct rendering mode */
+  static void
+  ft_smooth_lcd_spans( int             y,
+                       int             count,
+                       const FT_Span*  spans,
+                       TOrigin*        target )
+  {
+    unsigned char*  dst_line = target->origin - y * target->pitch;
+    unsigned char*  dst;
+    unsigned short  w;
+
+
+    for ( ; count--; spans++ )
+      for ( dst = dst_line + spans->x * 3, w = spans->len; w--; dst += 3 )
+        *dst = spans->coverage;
+  }
+
+
+  static FT_Error
+  ft_smooth_raster_lcd( FT_Renderer  render,
+                        FT_Outline*  outline,
+                        FT_Bitmap*   bitmap )
+  {
+    FT_Error      error = FT_Err_Ok;
+    FT_Vector*    sub   = render->root.library->lcd_geometry;
+    FT_Pos        x, y;
+
+    FT_Raster_Params   params;
+    TOrigin            target;
+
+
+    /* Render 3 separate coverage bitmaps, shifting the outline.  */
+    /* Set up direct rendering to record them on each third byte. */
+    params.source     = outline;
+    params.flags      = FT_RASTER_FLAG_AA | FT_RASTER_FLAG_DIRECT;
+    params.gray_spans = (FT_SpanFunc)ft_smooth_lcd_spans;
+    params.user       = &target;
+
+    params.clip_box.xMin = 0;
+    params.clip_box.yMin = 0;
+    params.clip_box.xMax = bitmap->width;
+    params.clip_box.yMax = bitmap->rows;
+
+    if ( bitmap->pitch < 0 )
+      target.origin = bitmap->buffer;
+    else
+      target.origin = bitmap->buffer
+                      + ( bitmap->rows - 1 ) * (unsigned int)bitmap->pitch;
+
+    target.pitch = bitmap->pitch;
+
+    FT_Outline_Translate( outline,
+                          -sub[0].x,
+                          -sub[0].y );
+    error = render->raster_render( render->raster, &params );
+    x = sub[0].x;
+    y = sub[0].y;
+    if ( error )
+      goto Exit;
+
+    target.origin++;
+    FT_Outline_Translate( outline,
+                          sub[0].x - sub[1].x,
+                          sub[0].y - sub[1].y );
+    error = render->raster_render( render->raster, &params );
+    x = sub[1].x;
+    y = sub[1].y;
+    if ( error )
+      goto Exit;
+
+    target.origin++;
+    FT_Outline_Translate( outline,
+                          sub[1].x - sub[2].x,
+                          sub[1].y - sub[2].y );
+    error = render->raster_render( render->raster, &params );
+    x = sub[2].x;
+    y = sub[2].y;
+
+  Exit:
+    FT_Outline_Translate( outline, x, y );
+
+    return error;
+  }
+
+
+  static FT_Error
+  ft_smooth_raster_lcdv( FT_Renderer  render,
+                         FT_Outline*  outline,
+                         FT_Bitmap*   bitmap )
+  {
+    FT_Error     error = FT_Err_Ok;
+    int          pitch = bitmap->pitch;
+    FT_Vector*   sub   = render->root.library->lcd_geometry;
+    FT_Pos       x, y;
+
+    FT_Raster_Params  params;
+
+
+    params.target = bitmap;
+    params.source = outline;
+    params.flags  = FT_RASTER_FLAG_AA;
+
+    /* Render 3 separate coverage bitmaps, shifting the outline. */
+    /* Notice that the subpixel geometry vectors are rotated.    */
+    /* Triple the pitch to render on each third row.            */
+    bitmap->pitch *= 3;
+    bitmap->rows  /= 3;
+
+    FT_Outline_Translate( outline,
+                          -sub[0].y,
+                          sub[0].x );
+    error = render->raster_render( render->raster, &params );
+    x = sub[0].y;
+    y = -sub[0].x;
+    if ( error )
+      goto Exit;
+
+    bitmap->buffer += pitch;
+    FT_Outline_Translate( outline,
+                          sub[0].y - sub[1].y,
+                          sub[1].x - sub[0].x );
+    error = render->raster_render( render->raster, &params );
+    x = sub[1].y;
+    y = -sub[1].x;
+    bitmap->buffer -= pitch;
+    if ( error )
+      goto Exit;
+
+    bitmap->buffer += 2 * pitch;
+    FT_Outline_Translate( outline,
+                          sub[1].y - sub[2].y,
+                          sub[2].x - sub[1].x );
+    error = render->raster_render( render->raster, &params );
+    x = sub[2].y;
+    y = -sub[2].x;
+    bitmap->buffer -= 2 * pitch;
+
+  Exit:
+    FT_Outline_Translate( outline, x, y );
+
+    bitmap->pitch /= 3;
+    bitmap->rows  *= 3;
+
+    return error;
+  }
+
+#else   /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
+
+  /* initialize renderer -- init its raster */
+  static FT_Error
+  ft_smooth_init( FT_Renderer  render )
+  {
+    /* set up default LCD filtering */
+    FT_Library_SetLcdFilter( render->root.library, FT_LCD_FILTER_DEFAULT );
+
+    render->clazz->raster_class->raster_reset( render->raster, NULL, 0 );
+
+    return 0;
+  }
+
+
+  static FT_Error
+  ft_smooth_raster_lcd( FT_Renderer  render,
+                        FT_Outline*  outline,
+                        FT_Bitmap*   bitmap )
+  {
+    FT_Error    error      = FT_Err_Ok;
+    FT_Vector*  points     = outline->points;
+    FT_Vector*  points_end = FT_OFFSET( points, outline->n_points );
+    FT_Vector*  vec;
+
+    FT_Raster_Params  params;
+
+
+    params.target = bitmap;
+    params.source = outline;
+    params.flags  = FT_RASTER_FLAG_AA;
+
+    /* implode outline */
+    for ( vec = points; vec < points_end; vec++ )
+      vec->x *= 3;
+
+    /* render outline into the bitmap */
+    error = render->raster_render( render->raster, &params );
+
+    /* deflate outline */
+    for ( vec = points; vec < points_end; vec++ )
+      vec->x /= 3;
+
+    return error;
+  }
+
+
+  static FT_Error
+  ft_smooth_raster_lcdv( FT_Renderer  render,
+                         FT_Outline*  outline,
+                         FT_Bitmap*   bitmap )
+  {
+    FT_Error    error      = FT_Err_Ok;
+    FT_Vector*  points     = outline->points;
+    FT_Vector*  points_end = FT_OFFSET( points, outline->n_points );
+    FT_Vector*  vec;
+
+    FT_Raster_Params  params;
+
+
+    params.target = bitmap;
+    params.source = outline;
+    params.flags  = FT_RASTER_FLAG_AA;
+
+    /* implode outline */
+    for ( vec = points; vec < points_end; vec++ )
+      vec->y *= 3;
+
+    /* render outline into the bitmap */
+    error = render->raster_render( render->raster, &params );
+
+    /* deflate outline */
+    for ( vec = points; vec < points_end; vec++ )
+      vec->y /= 3;
+
+    return error;
+  }
+
+#endif  /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
+
+/* Oversampling scale to be used in rendering overlaps */
+#define SCALE  ( 1 << 2 )
+
+  /* This function averages inflated spans in direct rendering mode */
+  static void
+  ft_smooth_overlap_spans( int             y,
+                           int             count,
+                           const FT_Span*  spans,
+                           TOrigin*        target )
+  {
+    unsigned char*  dst = target->origin - ( y / SCALE ) * target->pitch;
+    unsigned short  x;
+    unsigned int    cover, sum;
+
+
+    /* When accumulating the oversampled spans we need to assure that  */
+    /* fully covered pixels are equal to 255 and do not overflow.      */
+    /* It is important that the SCALE is a power of 2, each subpixel   */
+    /* cover can also reach a power of 2 after rounding, and the total */
+    /* is clamped to 255 when it adds up to 256.                       */
+    for ( ; count--; spans++ )
+    {
+      cover = ( spans->coverage + SCALE * SCALE / 2 ) / ( SCALE * SCALE );
+      for ( x = 0; x < spans->len; x++ )
+      {
+        sum                           = dst[( spans->x + x ) / SCALE] + cover;
+        dst[( spans->x + x ) / SCALE] = (unsigned char)( sum - ( sum >> 8 ) );
+      }
+    }
+  }
+
+
+  static FT_Error
+  ft_smooth_raster_overlap( FT_Renderer  render,
+                            FT_Outline*  outline,
+                            FT_Bitmap*   bitmap )
+  {
+    FT_Error    error      = FT_Err_Ok;
+    FT_Vector*  points     = outline->points;
+    FT_Vector*  points_end = FT_OFFSET( points, outline->n_points );
+    FT_Vector*  vec;
+
+    FT_Raster_Params   params;
+    TOrigin            target;
+
+
+    /* Reject outlines that are too wide for 16-bit FT_Span.       */
+    /* Other limits are applied upstream with the same error code. */
+    if ( bitmap->width * SCALE > 0x7FFF )
+      return FT_THROW( Raster_Overflow );
+
+    /* Set up direct rendering to average oversampled spans. */
+    params.source     = outline;
+    params.flags      = FT_RASTER_FLAG_AA | FT_RASTER_FLAG_DIRECT;
+    params.gray_spans = (FT_SpanFunc)ft_smooth_overlap_spans;
+    params.user       = &target;
+
+    params.clip_box.xMin = 0;
+    params.clip_box.yMin = 0;
+    params.clip_box.xMax = bitmap->width * SCALE;
+    params.clip_box.yMax = bitmap->rows  * SCALE;
+
+    if ( bitmap->pitch < 0 )
+      target.origin = bitmap->buffer;
+    else
+      target.origin = bitmap->buffer
+                      + ( bitmap->rows - 1 ) * (unsigned int)bitmap->pitch;
+
+    target.pitch = bitmap->pitch;
+
+    /* inflate outline */
+    for ( vec = points; vec < points_end; vec++ )
+    {
+      vec->x *= SCALE;
+      vec->y *= SCALE;
+    }
+
+    /* render outline into the bitmap */
+    error = render->raster_render( render->raster, &params );
+
+    /* deflate outline */
+    for ( vec = points; vec < points_end; vec++ )
+    {
+      vec->x /= SCALE;
+      vec->y /= SCALE;
+    }
+
+    return error;
+  }
+
+#undef SCALE
+
+  static FT_Error
+  ft_smooth_render( FT_Renderer       render,
+                    FT_GlyphSlot      slot,
+                    FT_Render_Mode    mode,
+                    const FT_Vector*  origin )
+  {
+    FT_Error     error   = FT_Err_Ok;
+    FT_Outline*  outline = &slot->outline;
+    FT_Bitmap*   bitmap  = &slot->bitmap;
+    FT_Memory    memory  = render->root.memory;
+    FT_Pos       x_shift = 0;
+    FT_Pos       y_shift = 0;
+
+
+    /* check glyph image format */
+    if ( slot->format != render->glyph_format )
+    {
+      error = FT_THROW( Invalid_Argument );
+      goto Exit;
+    }
+
+    /* check mode */
+    if ( mode != FT_RENDER_MODE_NORMAL &&
+         mode != FT_RENDER_MODE_LIGHT  &&
+         mode != FT_RENDER_MODE_LCD    &&
+         mode != FT_RENDER_MODE_LCD_V  )
+    {
+      error = FT_THROW( Cannot_Render_Glyph );
+      goto Exit;
+    }
+
+    /* release old bitmap buffer */
+    if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
+    {
+      FT_FREE( bitmap->buffer );
+      slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
+    }
+
+    if ( ft_glyphslot_preset_bitmap( slot, mode, origin ) )
+    {
+      error = FT_THROW( Raster_Overflow );
+      goto Exit;
+    }
+
+    if ( !bitmap->rows || !bitmap->pitch )
+      goto Exit;
+
+    /* allocate new one */
+    if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
+      goto Exit;
+
+    slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
+
+    x_shift = 64 * -slot->bitmap_left;
+    y_shift = 64 * -slot->bitmap_top;
+    if ( bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V )
+      y_shift += 64 * (FT_Int)bitmap->rows / 3;
+    else
+      y_shift += 64 * (FT_Int)bitmap->rows;
+
+    if ( origin )
+    {
+      x_shift += origin->x;
+      y_shift += origin->y;
+    }
+
+    /* translate outline to render it into the bitmap */
+    if ( x_shift || y_shift )
+      FT_Outline_Translate( outline, x_shift, y_shift );
+
+    if ( mode == FT_RENDER_MODE_NORMAL ||
+         mode == FT_RENDER_MODE_LIGHT  )
+    {
+      if ( outline->flags & FT_OUTLINE_OVERLAP )
+        error = ft_smooth_raster_overlap( render, outline, bitmap );
+      else
+      {
+        FT_Raster_Params  params;
+
+
+        params.target = bitmap;
+        params.source = outline;
+        params.flags  = FT_RASTER_FLAG_AA;
+
+        error = render->raster_render( render->raster, &params );
+      }
+    }
+    else
+    {
+      if ( mode == FT_RENDER_MODE_LCD )
+        error = ft_smooth_raster_lcd ( render, outline, bitmap );
+      else if ( mode == FT_RENDER_MODE_LCD_V )
+        error = ft_smooth_raster_lcdv( render, outline, bitmap );
+
+#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
+
+      /* finally apply filtering */
+      {
+        FT_Byte*                 lcd_weights;
+        FT_Bitmap_LcdFilterFunc  lcd_filter_func;
+
+
+        /* Per-face LCD filtering takes priority if set up. */
+        if ( slot->face && slot->face->internal->lcd_filter_func )
+        {
+          lcd_weights     = slot->face->internal->lcd_weights;
+          lcd_filter_func = slot->face->internal->lcd_filter_func;
+        }
+        else
+        {
+          lcd_weights     = slot->library->lcd_weights;
+          lcd_filter_func = slot->library->lcd_filter_func;
+        }
+
+        if ( lcd_filter_func )
+          lcd_filter_func( bitmap, lcd_weights );
+      }
+
+#endif /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
+
+    }
+
+  Exit:
+    if ( !error )
+    {
+      /* everything is fine; the glyph is now officially a bitmap */
+      slot->format = FT_GLYPH_FORMAT_BITMAP;
+    }
+    else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP )
+    {
+      FT_FREE( bitmap->buffer );
+      slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
+    }
+
+    if ( x_shift || y_shift )
+      FT_Outline_Translate( outline, -x_shift, -y_shift );
+
+    return error;
+  }
+
+
+  FT_DEFINE_RENDERER(
+    ft_smooth_renderer_class,
+
+      FT_MODULE_RENDERER,
+      sizeof ( FT_RendererRec ),
+
+      "smooth",
+      0x10000L,
+      0x20000L,
+
+      NULL,    /* module specific interface */
+
+      (FT_Module_Constructor)ft_smooth_init,  /* module_init   */
+      (FT_Module_Destructor) NULL,            /* module_done   */
+      (FT_Module_Requester)  NULL,            /* get_interface */
+
+    FT_GLYPH_FORMAT_OUTLINE,
+
+    (FT_Renderer_RenderFunc)   ft_smooth_render,     /* render_glyph    */
+    (FT_Renderer_TransformFunc)ft_smooth_transform,  /* transform_glyph */
+    (FT_Renderer_GetCBoxFunc)  ft_smooth_get_cbox,   /* get_glyph_cbox  */
+    (FT_Renderer_SetModeFunc)  ft_smooth_set_mode,   /* set_mode        */
+
+    (FT_Raster_Funcs*)&ft_grays_raster               /* raster_class    */
+  )
+
+
+/* END */
diff --git a/modules/freetype2/src/smooth/ftsmooth.h b/modules/freetype2/src/smooth/ftsmooth.h
new file mode 100644
index 0000000000..f8bdc9938b
--- /dev/null
+++ b/modules/freetype2/src/smooth/ftsmooth.h
@@ -0,0 +1,37 @@
+/****************************************************************************
+ *
+ * ftsmooth.h
+ *
+ *   Anti-aliasing renderer interface (specification).
+ *
+ * Copyright (C) 1996-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * 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 FTSMOOTH_H_
+#define FTSMOOTH_H_
+
+
+#include <freetype/ftrender.h>
+
+
+FT_BEGIN_HEADER
+
+
+  FT_DECLARE_RENDERER( ft_smooth_renderer_class )
+
+
+FT_END_HEADER
+
+#endif /* FTSMOOTH_H_ */
+
+
+/* END */
diff --git a/modules/freetype2/src/smooth/module.mk b/modules/freetype2/src/smooth/module.mk
new file mode 100644
index 0000000000..82ab2fa596
--- /dev/null
+++ b/modules/freetype2/src/smooth/module.mk
@@ -0,0 +1,23 @@
+#
+# FreeType 2 smooth renderer module definition
+#
+
+
+# Copyright (C) 1996-2023 by
+# David Turner, Robert Wilhelm, and Werner Lemberg.
+#
+# 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.
+
+
+FTMODULE_H_COMMANDS += SMOOTH_RENDERER
+
+define SMOOTH_RENDERER
+$(OPEN_DRIVER) FT_Renderer_Class, ft_smooth_renderer_class $(CLOSE_DRIVER)
+$(ECHO_DRIVER)smooth    $(ECHO_DRIVER_DESC)anti-aliased bitmap renderer$(ECHO_DRIVER_DONE)
+endef
+
+# EOF
diff --git a/modules/freetype2/src/smooth/rules.mk b/modules/freetype2/src/smooth/rules.mk
new file mode 100644
index 0000000000..5d89c75407
--- /dev/null
+++ b/modules/freetype2/src/smooth/rules.mk
@@ -0,0 +1,73 @@
+#
+# FreeType 2 smooth renderer module build rules
+#
+
+
+# Copyright (C) 1996-2023 by
+# David Turner, Robert Wilhelm, and Werner Lemberg.
+#
+# 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.
+
+
+# smooth driver directory
+#
+SMOOTH_DIR := $(SRC_DIR)/smooth
+
+
+# compilation flags for the driver
+#
+SMOOTH_COMPILE := $(CC) $(ANSIFLAGS)                               \
+                        $I$(subst /,$(COMPILER_SEP),$(SMOOTH_DIR)) \
+                        $(INCLUDE_FLAGS)                           \
+                        $(FT_CFLAGS)
+
+
+# smooth driver sources (i.e., C files)
+#
+SMOOTH_DRV_SRC := $(SMOOTH_DIR)/ftgrays.c  \
+                  $(SMOOTH_DIR)/ftsmooth.c
+
+
+# smooth driver headers
+#
+SMOOTH_DRV_H := $(SMOOTH_DRV_SRC:%c=%h)  \
+                $(SMOOTH_DIR)/ftsmerrs.h
+
+
+# smooth driver object(s)
+#
+#   SMOOTH_DRV_OBJ_M is used during `multi' builds.
+#   SMOOTH_DRV_OBJ_S is used during `single' builds.
+#
+SMOOTH_DRV_OBJ_M := $(SMOOTH_DRV_SRC:$(SMOOTH_DIR)/%.c=$(OBJ_DIR)/%.$O)
+SMOOTH_DRV_OBJ_S := $(OBJ_DIR)/smooth.$O
+
+# smooth driver source file for single build
+#
+SMOOTH_DRV_SRC_S := $(SMOOTH_DIR)/smooth.c
+
+
+# smooth driver - single object
+#
+$(SMOOTH_DRV_OBJ_S): $(SMOOTH_DRV_SRC_S) $(SMOOTH_DRV_SRC) \
+                     $(FREETYPE_H) $(SMOOTH_DRV_H)
+	$(SMOOTH_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $(SMOOTH_DRV_SRC_S))
+
+
+# smooth driver - multiple objects
+#
+$(OBJ_DIR)/%.$O: $(SMOOTH_DIR)/%.c $(FREETYPE_H) $(SMOOTH_DRV_H)
+	$(SMOOTH_COMPILE) $T$(subst /,$(COMPILER_SEP),$@ $<)
+
+
+# update main driver object lists
+#
+DRV_OBJS_S += $(SMOOTH_DRV_OBJ_S)
+DRV_OBJS_M += $(SMOOTH_DRV_OBJ_M)
+
+
+# EOF
diff --git a/modules/freetype2/src/smooth/smooth.c b/modules/freetype2/src/smooth/smooth.c
new file mode 100644
index 0000000000..9a0b824c2a
--- /dev/null
+++ b/modules/freetype2/src/smooth/smooth.c
@@ -0,0 +1,25 @@
+/****************************************************************************
+ *
+ * smooth.c
+ *
+ *   FreeType anti-aliasing rasterer module component (body only).
+ *
+ * Copyright (C) 1996-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * 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.
+ *
+ */
+
+
+#define FT_MAKE_OPTION_SINGLE_OBJECT
+
+#include "ftgrays.c"
+#include "ftsmooth.c"
+
+
+/* END */