Initial import from the monolithic Qt.

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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 2022 insertions, 0 deletions

diff --git a/src/3rdparty/freetype/src/truetype/ttgload.c b/src/3rdparty/freetype/src/truetype/ttgload.c
new file mode 100644
index 0000000000..06e9ccd1d8
--- /dev/null
+++ b/src/3rdparty/freetype/src/truetype/ttgload.c
@@ -0,0 +1,2022 @@
+/***************************************************************************/
+/*                                                                         */
+/*  ttgload.c                                                              */
+/*                                                                         */
+/*    TrueType Glyph Loader (body).                                        */
+/*                                                                         */
+/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 <ft2build.h>
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_CALC_H
+#include FT_INTERNAL_STREAM_H
+#include FT_INTERNAL_SFNT_H
+#include FT_TRUETYPE_TAGS_H
+#include FT_OUTLINE_H
+
+#include "ttgload.h"
+#include "ttpload.h"
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+#include "ttgxvar.h"
+#endif
+
+#include "tterrors.h"
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* 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  trace_ttgload
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* Composite font flags.                                                 */
+  /*                                                                       */
+#define ARGS_ARE_WORDS             0x0001
+#define ARGS_ARE_XY_VALUES         0x0002
+#define ROUND_XY_TO_GRID           0x0004
+#define WE_HAVE_A_SCALE            0x0008
+/* reserved                        0x0010 */
+#define MORE_COMPONENTS            0x0020
+#define WE_HAVE_AN_XY_SCALE        0x0040
+#define WE_HAVE_A_2X2              0x0080
+#define WE_HAVE_INSTR              0x0100
+#define USE_MY_METRICS             0x0200
+#define OVERLAP_COMPOUND           0x0400
+#define SCALED_COMPONENT_OFFSET    0x0800
+#define UNSCALED_COMPONENT_OFFSET  0x1000
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* Returns the horizontal metrics in font units for a given glyph.  If   */
+  /* `check' is true, take care of monospaced fonts by returning the       */
+  /* advance width maximum.                                                */
+  /*                                                                       */
+  FT_LOCAL_DEF(void)
+  TT_Get_HMetrics( TT_Face     face,
+                   FT_UInt     idx,
+                   FT_Bool     check,
+                   FT_Short*   lsb,
+                   FT_UShort*  aw )
+  {
+    ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw );
+
+    if ( check && face->postscript.isFixedPitch )
+      *aw = face->horizontal.advance_Width_Max;
+  }
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* Returns the vertical metrics in font units for a given glyph.         */
+  /* Greg Hitchcock from Microsoft told us that if there were no `vmtx'    */
+  /* table, typoAscender/Descender from the `OS/2' table would be used     */
+  /* instead, and if there were no `OS/2' table, use ascender/descender    */
+  /* from the `hhea' table.  But that is not what Microsoft's rasterizer   */
+  /* apparently does: It uses the ppem value as the advance height, and    */
+  /* sets the top side bearing to be zero.                                 */
+  /*                                                                       */
+  /* The monospace `check' is probably not meaningful here, but we leave   */
+  /* it in for a consistent interface.                                     */
+  /*                                                                       */
+  FT_LOCAL_DEF(void)
+  TT_Get_VMetrics( TT_Face     face,
+                   FT_UInt     idx,
+                   FT_Bool     check,
+                   FT_Short*   tsb,
+                   FT_UShort*  ah )
+  {
+    FT_UNUSED( check );
+
+    if ( face->vertical_info )
+      ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah );
+
+#if 1             /* Empirically determined, at variance with what MS said */
+
+    else
+    {
+      *tsb = 0;
+      *ah  = face->root.units_per_EM;
+    }
+
+#else      /* This is what MS said to do.  It isn't what they do, however. */
+
+    else if ( face->os2.version != 0xFFFFU )
+    {
+      *tsb = face->os2.sTypoAscender;
+      *ah  = face->os2.sTypoAscender - face->os2.sTypoDescender;
+    }
+    else
+    {
+      *tsb = face->horizontal.Ascender;
+      *ah  = face->horizontal.Ascender - face->horizontal.Descender;
+    }
+
+#endif
+
+  }
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* Translates an array of coordinates.                                   */
+  /*                                                                       */
+  static void
+  translate_array( FT_UInt     n,
+                   FT_Vector*  coords,
+                   FT_Pos      delta_x,
+                   FT_Pos      delta_y )
+  {
+    FT_UInt  k;
+
+
+    if ( delta_x )
+      for ( k = 0; k < n; k++ )
+        coords[k].x += delta_x;
+
+    if ( delta_y )
+      for ( k = 0; k < n; k++ )
+        coords[k].y += delta_y;
+  }
+
+
+#undef  IS_HINTED
+#define IS_HINTED( flags )  ( ( flags & FT_LOAD_NO_HINTING ) == 0 )
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* The following functions are used by default with TrueType fonts.      */
+  /* However, they can be replaced by alternatives if we need to support   */
+  /* TrueType-compressed formats (like MicroType) in the future.           */
+  /*                                                                       */
+  /*************************************************************************/
+
+  FT_CALLBACK_DEF( FT_Error )
+  TT_Access_Glyph_Frame( TT_Loader  loader,
+                         FT_UInt    glyph_index,
+                         FT_ULong   offset,
+                         FT_UInt    byte_count )
+  {
+    FT_Error   error;
+    FT_Stream  stream = loader->stream;
+
+    /* for non-debug mode */
+    FT_UNUSED( glyph_index );
+
+
+    FT_TRACE5(( "Glyph %ld\n", glyph_index ));
+
+    /* the following line sets the `error' variable through macros! */
+    if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) )
+      return error;
+
+    loader->cursor = stream->cursor;
+    loader->limit  = stream->limit;
+
+    return TT_Err_Ok;
+  }
+
+
+  FT_CALLBACK_DEF( void )
+  TT_Forget_Glyph_Frame( TT_Loader  loader )
+  {
+    FT_Stream  stream = loader->stream;
+
+
+    FT_FRAME_EXIT();
+  }
+
+
+  FT_CALLBACK_DEF( FT_Error )
+  TT_Load_Glyph_Header( TT_Loader  loader )
+  {
+    FT_Byte*  p     = loader->cursor;
+    FT_Byte*  limit = loader->limit;
+
+
+    if ( p + 10 > limit )
+      return TT_Err_Invalid_Outline;
+
+    loader->n_contours = FT_NEXT_SHORT( p );
+
+    loader->bbox.xMin = FT_NEXT_SHORT( p );
+    loader->bbox.yMin = FT_NEXT_SHORT( p );
+    loader->bbox.xMax = FT_NEXT_SHORT( p );
+    loader->bbox.yMax = FT_NEXT_SHORT( p );
+
+    FT_TRACE5(( "  # of contours: %d\n", loader->n_contours ));
+    FT_TRACE5(( "  xMin: %4d  xMax: %4d\n", loader->bbox.xMin,
+                                            loader->bbox.xMax ));
+    FT_TRACE5(( "  yMin: %4d  yMax: %4d\n", loader->bbox.yMin,
+                                            loader->bbox.yMax ));
+    loader->cursor = p;
+
+    return TT_Err_Ok;
+  }
+
+
+  FT_CALLBACK_DEF( FT_Error )
+  TT_Load_Simple_Glyph( TT_Loader  load )
+  {
+    FT_Error        error;
+    FT_Byte*        p          = load->cursor;
+    FT_Byte*        limit      = load->limit;
+    FT_GlyphLoader  gloader    = load->gloader;
+    FT_Int          n_contours = load->n_contours;
+    FT_Outline*     outline;
+    TT_Face         face       = (TT_Face)load->face;
+    FT_UShort       n_ins;
+    FT_Int          n_points;
+
+    FT_Byte         *flag, *flag_limit;
+    FT_Byte         c, count;
+    FT_Vector       *vec, *vec_limit;
+    FT_Pos          x;
+    FT_Short        *cont, *cont_limit, prev_cont;
+    FT_Int          xy_size = 0;
+
+
+    /* check that we can add the contours to the glyph */
+    error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours );
+    if ( error )
+      goto Fail;
+
+    /* reading the contours' endpoints & number of points */
+    cont       = gloader->current.outline.contours;
+    cont_limit = cont + n_contours;
+
+    /* check space for contours array + instructions count */
+    if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit )
+      goto Invalid_Outline;
+
+    prev_cont = FT_NEXT_USHORT( p );
+
+    if ( n_contours > 0 )
+      cont[0] = prev_cont;
+
+    for ( cont++; cont < cont_limit; cont++ )
+    {
+      cont[0] = FT_NEXT_USHORT( p );
+      if ( cont[0] <= prev_cont )
+      {
+        /* unordered contours: this is invalid */
+        error = FT_Err_Invalid_Table;
+        goto Fail;
+      }
+      prev_cont = cont[0];
+    }
+
+    n_points = 0;
+    if ( n_contours > 0 )
+    {
+      n_points = cont[-1] + 1;
+      if ( n_points < 0 )
+        goto Invalid_Outline;
+    }
+
+    /* note that we will add four phantom points later */
+    error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 );
+    if ( error )
+      goto Fail;
+
+    /* we'd better check the contours table right now */
+    outline = &gloader->current.outline;
+
+    for ( cont = outline->contours + 1; cont < cont_limit; cont++ )
+      if ( cont[-1] >= cont[0] )
+        goto Invalid_Outline;
+
+    /* reading the bytecode instructions */
+    load->glyph->control_len  = 0;
+    load->glyph->control_data = 0;
+
+    if ( p + 2 > limit )
+      goto Invalid_Outline;
+
+    n_ins = FT_NEXT_USHORT( p );
+
+    FT_TRACE5(( "  Instructions size: %u\n", n_ins ));
+
+    if ( n_ins > face->max_profile.maxSizeOfInstructions )
+    {
+      FT_TRACE0(( "TT_Load_Simple_Glyph: Too many instructions (%d)\n",
+                  n_ins ));
+      error = TT_Err_Too_Many_Hints;
+      goto Fail;
+    }
+
+    if ( ( limit - p ) < n_ins )
+    {
+      FT_TRACE0(( "TT_Load_Simple_Glyph: Instruction count mismatch!\n" ));
+      error = TT_Err_Too_Many_Hints;
+      goto Fail;
+    }
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+    if ( IS_HINTED( load->load_flags ) )
+    {
+      load->glyph->control_len  = n_ins;
+      load->glyph->control_data = load->exec->glyphIns;
+
+      FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins );
+    }
+
+#endif /* TT_USE_BYTECODE_INTERPRETER */
+
+    p += n_ins;
+
+    /* reading the point tags */
+    flag       = (FT_Byte*)outline->tags;
+    flag_limit = flag + n_points;
+
+    FT_ASSERT( flag != NULL );
+
+    while ( flag < flag_limit )
+    {
+      if ( p + 1 > limit )
+        goto Invalid_Outline;
+
+      *flag++ = c = FT_NEXT_BYTE( p );
+      if ( c & 8 )
+      {
+        if ( p + 1 > limit )
+          goto Invalid_Outline;
+
+        count = FT_NEXT_BYTE( p );
+        if ( flag + (FT_Int)count > flag_limit )
+          goto Invalid_Outline;
+
+        for ( ; count > 0; count-- )
+          *flag++ = c;
+      }
+    }
+
+    /* reading the X coordinates */
+
+    vec       = outline->points;
+    vec_limit = vec + n_points;
+    flag      = (FT_Byte*)outline->tags;
+    x         = 0;
+
+    if ( p + xy_size > limit )
+      goto Invalid_Outline;
+
+    for ( ; vec < vec_limit; vec++, flag++ )
+    {
+      FT_Pos   y = 0;
+      FT_Byte  f = *flag;
+
+
+      if ( f & 2 )
+      {
+        if ( p + 1 > limit )
+          goto Invalid_Outline;
+
+        y = (FT_Pos)FT_NEXT_BYTE( p );
+        if ( ( f & 16 ) == 0 )
+          y = -y;
+      }
+      else if ( ( f & 16 ) == 0 )
+      {
+        if ( p + 2 > limit )
+          goto Invalid_Outline;
+
+        y = (FT_Pos)FT_NEXT_SHORT( p );
+      }
+
+      x     += y;
+      vec->x = x;
+      /* the cast is for stupid compilers */
+      *flag  = (FT_Byte)( f & ~( 2 | 16 ) );
+    }
+
+    /* reading the Y coordinates */
+
+    vec       = gloader->current.outline.points;
+    vec_limit = vec + n_points;
+    flag      = (FT_Byte*)outline->tags;
+    x         = 0;
+
+    for ( ; vec < vec_limit; vec++, flag++ )
+    {
+      FT_Pos   y = 0;
+      FT_Byte  f = *flag;
+
+
+      if ( f & 4 )
+      {
+        if ( p + 1 > limit )
+          goto Invalid_Outline;
+
+        y = (FT_Pos)FT_NEXT_BYTE( p );
+        if ( ( f & 32 ) == 0 )
+          y = -y;
+      }
+      else if ( ( f & 32 ) == 0 )
+      {
+        if ( p + 2 > limit )
+          goto Invalid_Outline;
+
+        y = (FT_Pos)FT_NEXT_SHORT( p );
+      }
+
+      x     += y;
+      vec->y = x;
+      /* the cast is for stupid compilers */
+      *flag  = (FT_Byte)( f & FT_CURVE_TAG_ON );
+    }
+
+    outline->n_points   = (FT_UShort)n_points;
+    outline->n_contours = (FT_Short) n_contours;
+
+    load->cursor = p;
+
+  Fail:
+    return error;
+
+  Invalid_Outline:
+    error = TT_Err_Invalid_Outline;
+    goto Fail;
+  }
+
+
+  FT_CALLBACK_DEF( FT_Error )
+  TT_Load_Composite_Glyph( TT_Loader  loader )
+  {
+    FT_Error        error;
+    FT_Byte*        p       = loader->cursor;
+    FT_Byte*        limit   = loader->limit;
+    FT_GlyphLoader  gloader = loader->gloader;
+    FT_SubGlyph     subglyph;
+    FT_UInt         num_subglyphs;
+
+
+    num_subglyphs = 0;
+
+    do
+    {
+      FT_Fixed  xx, xy, yy, yx;
+      FT_UInt   count;
+
+
+      /* check that we can load a new subglyph */
+      error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 );
+      if ( error )
+        goto Fail;
+
+      /* check space */
+      if ( p + 4 > limit )
+        goto Invalid_Composite;
+
+      subglyph = gloader->current.subglyphs + num_subglyphs;
+
+      subglyph->arg1 = subglyph->arg2 = 0;
+
+      subglyph->flags = FT_NEXT_USHORT( p );
+      subglyph->index = FT_NEXT_USHORT( p );
+
+      /* check space */
+      count = 2;
+      if ( subglyph->flags & ARGS_ARE_WORDS )
+        count += 2;
+      if ( subglyph->flags & WE_HAVE_A_SCALE )
+        count += 2;
+      else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
+        count += 4;
+      else if ( subglyph->flags & WE_HAVE_A_2X2 )
+        count += 8;
+
+      if ( p + count > limit )
+        goto Invalid_Composite;
+
+      /* read arguments */
+      if ( subglyph->flags & ARGS_ARE_WORDS )
+      {
+        subglyph->arg1 = FT_NEXT_SHORT( p );
+        subglyph->arg2 = FT_NEXT_SHORT( p );
+      }
+      else
+      {
+        subglyph->arg1 = FT_NEXT_CHAR( p );
+        subglyph->arg2 = FT_NEXT_CHAR( p );
+      }
+
+      /* read transform */
+      xx = yy = 0x10000L;
+      xy = yx = 0;
+
+      if ( subglyph->flags & WE_HAVE_A_SCALE )
+      {
+        xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+        yy = xx;
+      }
+      else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
+      {
+        xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+        yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+      }
+      else if ( subglyph->flags & WE_HAVE_A_2X2 )
+      {
+        xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+        yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+        xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+        yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
+      }
+
+      subglyph->transform.xx = xx;
+      subglyph->transform.xy = xy;
+      subglyph->transform.yx = yx;
+      subglyph->transform.yy = yy;
+
+      num_subglyphs++;
+
+    } while ( subglyph->flags & MORE_COMPONENTS );
+
+    gloader->current.num_subglyphs = num_subglyphs;
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+    {
+      FT_Stream  stream = loader->stream;
+
+
+      /* we must undo the FT_FRAME_ENTER in order to point */
+      /* to the composite instructions, if we find some.   */
+      /* We will process them later.                       */
+      /*                                                   */
+      loader->ins_pos = (FT_ULong)( FT_STREAM_POS() +
+                                    p - limit );
+    }
+
+#endif
+
+    loader->cursor = p;
+
+  Fail:
+    return error;
+
+  Invalid_Composite:
+    error = TT_Err_Invalid_Composite;
+    goto Fail;
+  }
+
+
+  FT_LOCAL_DEF( void )
+  TT_Init_Glyph_Loading( TT_Face  face )
+  {
+    face->access_glyph_frame   = TT_Access_Glyph_Frame;
+    face->read_glyph_header    = TT_Load_Glyph_Header;
+    face->read_simple_glyph    = TT_Load_Simple_Glyph;
+    face->read_composite_glyph = TT_Load_Composite_Glyph;
+    face->forget_glyph_frame   = TT_Forget_Glyph_Frame;
+  }
+
+
+  static void
+  tt_prepare_zone( TT_GlyphZone  zone,
+                   FT_GlyphLoad  load,
+                   FT_UInt       start_point,
+                   FT_UInt       start_contour )
+  {
+    zone->n_points    = (FT_UShort)( load->outline.n_points - start_point );
+    zone->n_contours  = (FT_Short) ( load->outline.n_contours -
+                                       start_contour );
+    zone->org         = load->extra_points + start_point;
+    zone->cur         = load->outline.points + start_point;
+    zone->orus        = load->extra_points2 + start_point;
+    zone->tags        = (FT_Byte*)load->outline.tags + start_point;
+    zone->contours    = (FT_UShort*)load->outline.contours + start_contour;
+    zone->first_point = (FT_UShort)start_point;
+  }
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Function>                                                            */
+  /*    TT_Hint_Glyph                                                      */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    Hint the glyph using the zone prepared by the caller.  Note that   */
+  /*    the zone is supposed to include four phantom points.               */
+  /*                                                                       */
+  static FT_Error
+  TT_Hint_Glyph( TT_Loader  loader,
+                 FT_Bool    is_composite )
+  {
+    TT_GlyphZone  zone = &loader->zone;
+    FT_Pos        origin;
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+    FT_UInt       n_ins;
+#else
+    FT_UNUSED( is_composite );
+#endif
+
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+    n_ins = loader->glyph->control_len;
+#endif
+
+    origin = zone->cur[zone->n_points - 4].x;
+    origin = FT_PIX_ROUND( origin ) - origin;
+    if ( origin )
+      translate_array( zone->n_points, zone->cur, origin, 0 );
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+    /* save original point position in org */
+    if ( n_ins > 0 )
+      FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points );
+
+    /* Reset graphics state. */
+    loader->exec->GS = ((TT_Size)loader->size)->GS;
+
+    /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */
+    /*      completely refer to the (already) hinted subglyphs.     */
+    if ( is_composite )
+    {
+      loader->exec->metrics.x_scale = 1 << 16;
+      loader->exec->metrics.y_scale = 1 << 16;
+
+      FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points );
+    }
+    else
+    {
+      loader->exec->metrics.x_scale =
+        ((TT_Size)loader->size)->metrics.x_scale;
+      loader->exec->metrics.y_scale =
+        ((TT_Size)loader->size)->metrics.y_scale;
+    }
+#endif
+
+    /* round pp2 and pp4 */
+    zone->cur[zone->n_points - 3].x =
+      FT_PIX_ROUND( zone->cur[zone->n_points - 3].x );
+    zone->cur[zone->n_points - 1].y =
+      FT_PIX_ROUND( zone->cur[zone->n_points - 1].y );
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+    if ( n_ins > 0 )
+    {
+      FT_Bool   debug;
+      FT_Error  error;
+
+
+      error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph,
+                                loader->exec->glyphIns, n_ins );
+      if ( error )
+        return error;
+
+      loader->exec->is_composite = is_composite;
+      loader->exec->pts          = *zone;
+
+      debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) &&
+                       ((TT_Size)loader->size)->debug             );
+
+      error = TT_Run_Context( loader->exec, debug );
+      if ( error && loader->exec->pedantic_hinting )
+        return error;
+    }
+
+#endif
+
+    /* save glyph phantom points */
+    if ( !loader->preserve_pps )
+    {
+      loader->pp1 = zone->cur[zone->n_points - 4];
+      loader->pp2 = zone->cur[zone->n_points - 3];
+      loader->pp3 = zone->cur[zone->n_points - 2];
+      loader->pp4 = zone->cur[zone->n_points - 1];
+    }
+
+    return TT_Err_Ok;
+  }
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Function>                                                            */
+  /*    TT_Process_Simple_Glyph                                            */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    Once a simple glyph has been loaded, it needs to be processed.     */
+  /*    Usually, this means scaling and hinting through bytecode           */
+  /*    interpretation.                                                    */
+  /*                                                                       */
+  static FT_Error
+  TT_Process_Simple_Glyph( TT_Loader  loader )
+  {
+    FT_GlyphLoader  gloader = loader->gloader;
+    FT_Error        error   = TT_Err_Ok;
+    FT_Outline*     outline;
+    FT_Int          n_points;
+
+
+    outline  = &gloader->current.outline;
+    n_points = outline->n_points;
+
+    /* set phantom points */
+
+    outline->points[n_points    ] = loader->pp1;
+    outline->points[n_points + 1] = loader->pp2;
+    outline->points[n_points + 2] = loader->pp3;
+    outline->points[n_points + 3] = loader->pp4;
+
+    outline->tags[n_points    ] = 0;
+    outline->tags[n_points + 1] = 0;
+    outline->tags[n_points + 2] = 0;
+    outline->tags[n_points + 3] = 0;
+
+    n_points += 4;
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+
+    if ( ((TT_Face)loader->face)->doblend )
+    {
+      /* Deltas apply to the unscaled data. */
+      FT_Vector*  deltas;
+      FT_Memory   memory = loader->face->memory;
+      FT_Int      i;
+
+
+      error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
+                                        loader->glyph_index,
+                                        &deltas,
+                                        n_points );
+      if ( error )
+        return error;
+
+      for ( i = 0; i < n_points; ++i )
+      {
+        outline->points[i].x += deltas[i].x;
+        outline->points[i].y += deltas[i].y;
+      }
+
+      FT_FREE( deltas );
+    }
+
+#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
+
+    if ( IS_HINTED( loader->load_flags ) )
+    {
+      tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 );
+
+      FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur,
+                     loader->zone.n_points + 4 );
+    }
+
+    /* scale the glyph */
+    if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+    {
+      FT_Vector*  vec     = outline->points;
+      FT_Vector*  limit   = outline->points + n_points;
+      FT_Fixed    x_scale = ((TT_Size)loader->size)->metrics.x_scale;
+      FT_Fixed    y_scale = ((TT_Size)loader->size)->metrics.y_scale;
+
+
+      for ( ; vec < limit; vec++ )
+      {
+        vec->x = FT_MulFix( vec->x, x_scale );
+        vec->y = FT_MulFix( vec->y, y_scale );
+      }
+
+      loader->pp1 = outline->points[n_points - 4];
+      loader->pp2 = outline->points[n_points - 3];
+      loader->pp3 = outline->points[n_points - 2];
+      loader->pp4 = outline->points[n_points - 1];
+    }
+
+    if ( IS_HINTED( loader->load_flags ) )
+    {
+      loader->zone.n_points += 4;
+
+      error = TT_Hint_Glyph( loader, 0 );
+    }
+
+    return error;
+  }
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Function>                                                            */
+  /*    TT_Process_Composite_Component                                     */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    Once a composite component has been loaded, it needs to be         */
+  /*    processed.  Usually, this means transforming and translating.      */
+  /*                                                                       */
+  static FT_Error
+  TT_Process_Composite_Component( TT_Loader    loader,
+                                  FT_SubGlyph  subglyph,
+                                  FT_UInt      start_point,
+                                  FT_UInt      num_base_points )
+  {
+    FT_GlyphLoader  gloader    = loader->gloader;
+    FT_Vector*      base_vec   = gloader->base.outline.points;
+    FT_UInt         num_points = gloader->base.outline.n_points;
+    FT_Bool         have_scale;
+    FT_Pos          x, y;
+
+
+    have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE     |
+                                              WE_HAVE_AN_XY_SCALE |
+                                              WE_HAVE_A_2X2       ) );
+
+    /* perform the transform required for this subglyph */
+    if ( have_scale )
+    {
+      FT_UInt  i;
+
+
+      for ( i = num_base_points; i < num_points; i++ )
+        FT_Vector_Transform( base_vec + i, &subglyph->transform );
+    }
+
+    /* get offset */
+    if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )
+    {
+      FT_UInt     k = subglyph->arg1;
+      FT_UInt     l = subglyph->arg2;
+      FT_Vector*  p1;
+      FT_Vector*  p2;
+
+
+      /* match l-th point of the newly loaded component to the k-th point */
+      /* of the previously loaded components.                             */
+
+      /* change to the point numbers used by our outline */
+      k += start_point;
+      l += num_base_points;
+      if ( k >= num_base_points ||
+           l >= num_points      )
+        return TT_Err_Invalid_Composite;
+
+      p1 = gloader->base.outline.points + k;
+      p2 = gloader->base.outline.points + l;
+
+      x = p1->x - p2->x;
+      y = p1->y - p2->y;
+    }
+    else
+    {
+      x = subglyph->arg1;
+      y = subglyph->arg2;
+
+      if ( !x && !y )
+        return TT_Err_Ok;
+
+  /* Use a default value dependent on                                     */
+  /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED.  This is useful for old TT */
+  /* fonts which don't set the xxx_COMPONENT_OFFSET bit.                  */
+
+      if ( have_scale &&
+#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED
+           !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) )
+#else
+            ( subglyph->flags & SCALED_COMPONENT_OFFSET ) )
+#endif
+      {
+
+#if 0
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* This algorithm is what Apple documents.  But it doesn't work.         */
+  /*                                                                       */
+        int  a = subglyph->transform.xx > 0 ?  subglyph->transform.xx
+                                            : -subglyph->transform.xx;
+        int  b = subglyph->transform.yx > 0 ?  subglyph->transform.yx
+                                            : -subglyph->transform.yx;
+        int  c = subglyph->transform.xy > 0 ?  subglyph->transform.xy
+                                            : -subglyph->transform.xy;
+        int  d = subglyph->transform.yy > 0 ? subglyph->transform.yy
+                                            : -subglyph->transform.yy;
+        int  m = a > b ? a : b;
+        int  n = c > d ? c : d;
+
+
+        if ( a - b <= 33 && a - b >= -33 )
+          m *= 2;
+        if ( c - d <= 33 && c - d >= -33 )
+          n *= 2;
+        x = FT_MulFix( x, m );
+        y = FT_MulFix( y, n );
+
+#else /* 0 */
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* This algorithm is a guess and works much better than the above.       */
+  /*                                                                       */
+        FT_Fixed  mac_xscale = FT_SqrtFixed(
+                                 FT_MulFix( subglyph->transform.xx,
+                                            subglyph->transform.xx ) +
+                                 FT_MulFix( subglyph->transform.xy,
+                                            subglyph->transform.xy ) );
+        FT_Fixed  mac_yscale = FT_SqrtFixed(
+                                 FT_MulFix( subglyph->transform.yy,
+                                            subglyph->transform.yy ) +
+                                 FT_MulFix( subglyph->transform.yx,
+                                            subglyph->transform.yx ) );
+
+
+        x = FT_MulFix( x, mac_xscale );
+        y = FT_MulFix( y, mac_yscale );
+
+#endif /* 0 */
+
+      }
+
+      if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
+      {
+        FT_Fixed  x_scale = ((TT_Size)loader->size)->metrics.x_scale;
+        FT_Fixed  y_scale = ((TT_Size)loader->size)->metrics.y_scale;
+
+
+        x = FT_MulFix( x, x_scale );
+        y = FT_MulFix( y, y_scale );
+
+        if ( subglyph->flags & ROUND_XY_TO_GRID )
+        {
+          x = FT_PIX_ROUND( x );
+          y = FT_PIX_ROUND( y );
+        }
+      }
+    }
+
+    if ( x || y )
+      translate_array( num_points - num_base_points,
+                       base_vec + num_base_points,
+                       x, y );
+
+    return TT_Err_Ok;
+  }
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Function>                                                            */
+  /*    TT_Process_Composite_Glyph                                         */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    This is slightly different from TT_Process_Simple_Glyph, in that   */
+  /*    its sole purpose is to hint the glyph.  Thus this function is      */
+  /*    only available when bytecode interpreter is enabled.               */
+  /*                                                                       */
+  static FT_Error
+  TT_Process_Composite_Glyph( TT_Loader  loader,
+                              FT_UInt    start_point,
+                              FT_UInt    start_contour )
+  {
+    FT_Error     error;
+    FT_Outline*  outline;
+    FT_UInt      i;
+
+
+    outline = &loader->gloader->base.outline;
+
+    /* make room for phantom points */
+    error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader,
+                                         outline->n_points + 4,
+                                         0 );
+    if ( error )
+      return error;
+
+    outline->points[outline->n_points    ] = loader->pp1;
+    outline->points[outline->n_points + 1] = loader->pp2;
+    outline->points[outline->n_points + 2] = loader->pp3;
+    outline->points[outline->n_points + 3] = loader->pp4;
+
+    outline->tags[outline->n_points    ] = 0;
+    outline->tags[outline->n_points + 1] = 0;
+    outline->tags[outline->n_points + 2] = 0;
+    outline->tags[outline->n_points + 3] = 0;
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+    {
+      FT_Stream  stream = loader->stream;
+      FT_UShort  n_ins;
+
+
+      /* TT_Load_Composite_Glyph only gives us the offset of instructions */
+      /* so we read them here                                             */
+      if ( FT_STREAM_SEEK( loader->ins_pos ) ||
+           FT_READ_USHORT( n_ins )           )
+        return error;
+
+      FT_TRACE5(( "  Instructions size = %d\n", n_ins ));
+
+      /* check it */
+      if ( n_ins > ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions )
+      {
+        FT_TRACE0(( "TT_Process_Composite_Glyph: Too many instructions (%d)\n",
+                    n_ins ));
+
+        return TT_Err_Too_Many_Hints;
+      }
+      else if ( n_ins == 0 )
+        return TT_Err_Ok;
+
+      if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) )
+        return error;
+
+      loader->glyph->control_data = loader->exec->glyphIns;
+      loader->glyph->control_len  = n_ins;
+    }
+
+#endif
+
+    tt_prepare_zone( &loader->zone, &loader->gloader->base,
+                     start_point, start_contour );
+
+    /* Some points are likely touched during execution of  */
+    /* instructions on components.  So let's untouch them. */
+    for ( i = start_point; i < loader->zone.n_points; i++ )
+      loader->zone.tags[i] &= ~( FT_CURVE_TAG_TOUCH_X |
+                                 FT_CURVE_TAG_TOUCH_Y );
+
+    loader->zone.n_points += 4;
+
+    return TT_Hint_Glyph( loader, 1 );
+  }
+
+
+  /* Calculate the four phantom points.                     */
+  /* The first two stand for horizontal origin and advance. */
+  /* The last two stand for vertical origin and advance.    */
+#define TT_LOADER_SET_PP( loader )                                          \
+          do {                                                              \
+            (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \
+            (loader)->pp1.y = 0;                                            \
+            (loader)->pp2.x = (loader)->pp1.x + (loader)->advance;          \
+            (loader)->pp2.y = 0;                                            \
+            (loader)->pp3.x = 0;                                            \
+            (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax;  \
+            (loader)->pp4.x = 0;                                            \
+            (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance;         \
+          } while ( 0 )
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Function>                                                            */
+  /*    load_truetype_glyph                                                */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    Loads a given truetype glyph.  Handles composites and uses a       */
+  /*    TT_Loader object.                                                  */
+  /*                                                                       */
+  static FT_Error
+  load_truetype_glyph( TT_Loader  loader,
+                       FT_UInt    glyph_index,
+                       FT_UInt    recurse_count )
+  {
+    FT_Error        error;
+    FT_Fixed        x_scale, y_scale;
+    FT_ULong        offset;
+    TT_Face         face         = (TT_Face)loader->face;
+    FT_GlyphLoader  gloader      = loader->gloader;
+    FT_Bool         opened_frame = 0;
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+    FT_Vector*      deltas       = NULL;
+#endif
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+    FT_StreamRec    inc_stream;
+    FT_Data         glyph_data;
+    FT_Bool         glyph_data_loaded = 0;
+#endif
+
+
+    /* some fonts have an incorrect value of `maxComponentDepth', */
+    /* thus we allow depth 1 to catch the majority of them        */
+    if ( recurse_count > 1                                   &&
+         recurse_count > face->max_profile.maxComponentDepth )
+    {
+      error = TT_Err_Invalid_Composite;
+      goto Exit;
+    }
+
+    /* check glyph index */
+    if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
+    {
+      error = TT_Err_Invalid_Glyph_Index;
+      goto Exit;
+    }
+
+    loader->glyph_index = glyph_index;
+
+    if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+    {
+      x_scale = ((TT_Size)loader->size)->metrics.x_scale;
+      y_scale = ((TT_Size)loader->size)->metrics.y_scale;
+    }
+    else
+    {
+      x_scale = 0x10000L;
+      y_scale = 0x10000L;
+    }
+
+    /* get metrics, horizontal and vertical */
+    {
+      FT_Short   left_bearing = 0, top_bearing = 0;
+      FT_UShort  advance_width = 0, advance_height = 0;
+
+
+      TT_Get_HMetrics( face, glyph_index,
+                       (FT_Bool)!( loader->load_flags &
+                                   FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
+                       &left_bearing,
+                       &advance_width );
+      TT_Get_VMetrics( face, glyph_index,
+                       (FT_Bool)!( loader->load_flags &
+                                   FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
+                       &top_bearing,
+                       &advance_height );
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+      /* If this is an incrementally loaded font see if there are */
+      /* overriding metrics for this glyph.                       */
+      if ( face->root.internal->incremental_interface &&
+           face->root.internal->incremental_interface->funcs->get_glyph_metrics )
+      {
+        FT_Incremental_MetricsRec  metrics;
+
+
+        metrics.bearing_x = left_bearing;
+        metrics.bearing_y = 0;
+        metrics.advance = advance_width;
+        error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
+                  face->root.internal->incremental_interface->object,
+                  glyph_index, FALSE, &metrics );
+        if ( error )
+          goto Exit;
+        left_bearing  = (FT_Short)metrics.bearing_x;
+        advance_width = (FT_UShort)metrics.advance;
+
+#if 0
+
+        /* GWW: Do I do the same for vertical metrics? */
+        metrics.bearing_x = 0;
+        metrics.bearing_y = top_bearing;
+        metrics.advance = advance_height;
+        error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
+                  face->root.internal->incremental_interface->object,
+                  glyph_index, TRUE, &metrics );
+        if ( error )
+          goto Exit;
+        top_bearing  = (FT_Short)metrics.bearing_y;
+        advance_height = (FT_UShort)metrics.advance;
+
+#endif /* 0 */
+
+      }
+
+#endif /* FT_CONFIG_OPTION_INCREMENTAL */
+
+      loader->left_bearing = left_bearing;
+      loader->advance      = advance_width;
+      loader->top_bearing  = top_bearing;
+      loader->vadvance     = advance_height;
+
+      if ( !loader->linear_def )
+      {
+        loader->linear_def = 1;
+        loader->linear     = advance_width;
+      }
+    }
+
+    /* Set `offset' to the start of the glyph relative to the start of */
+    /* the `glyf' table, and `byte_len' to the length of the glyph in  */
+    /* bytes.                                                          */
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+    /* If we are loading glyph data via the incremental interface, set */
+    /* the loader stream to a memory stream reading the data returned  */
+    /* by the interface.                                               */
+    if ( face->root.internal->incremental_interface )
+    {
+      error = face->root.internal->incremental_interface->funcs->get_glyph_data(
+                face->root.internal->incremental_interface->object,
+                glyph_index, &glyph_data );
+      if ( error )
+        goto Exit;
+
+      glyph_data_loaded = 1;
+      offset            = 0;
+      loader->byte_len  = glyph_data.length;
+
+      FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) );
+      FT_Stream_OpenMemory( &inc_stream,
+                            glyph_data.pointer, glyph_data.length );
+
+      loader->stream = &inc_stream;
+    }
+    else
+
+#endif /* FT_CONFIG_OPTION_INCREMENTAL */
+
+      offset = tt_face_get_location( face, glyph_index,
+                                     (FT_UInt*)&loader->byte_len );
+
+    if ( loader->byte_len > 0 )
+    {
+      if ( !loader->glyf_offset )
+      {
+        FT_TRACE2(( "no `glyf' table but non-zero `loca' entry!\n" ));
+        error = TT_Err_Invalid_Table;
+        goto Exit;
+      }
+
+      error = face->access_glyph_frame( loader, glyph_index,
+                                        loader->glyf_offset + offset,
+                                        loader->byte_len );
+      if ( error )
+        goto Exit;
+
+      opened_frame = 1;
+
+      /* read first glyph header */
+      error = face->read_glyph_header( loader );
+      if ( error )
+        goto Exit;
+    }
+
+    if ( loader->byte_len == 0 || loader->n_contours == 0 )
+    {
+      loader->bbox.xMin = 0;
+      loader->bbox.xMax = 0;
+      loader->bbox.yMin = 0;
+      loader->bbox.yMax = 0;
+
+      TT_LOADER_SET_PP( loader );
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+
+      if ( ((TT_Face)(loader->face))->doblend )
+      {
+        /* this must be done before scaling */
+        FT_Memory  memory = loader->face->memory;
+
+
+        error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
+                                          glyph_index, &deltas, 4 );
+        if ( error )
+          goto Exit;
+
+        loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y;
+        loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y;
+        loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y;
+        loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y;
+
+        FT_FREE( deltas );
+      }
+
+#endif
+
+      if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+      {
+        loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
+        loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
+        loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
+        loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
+      }
+
+      error = TT_Err_Ok;
+      goto Exit;
+    }
+
+    TT_LOADER_SET_PP( loader );
+
+    /***********************************************************************/
+    /***********************************************************************/
+    /***********************************************************************/
+
+    /* if it is a simple glyph, load it */
+
+    if ( loader->n_contours > 0 )
+    {
+      error = face->read_simple_glyph( loader );
+      if ( error )
+        goto Exit;
+
+      /* all data have been read */
+      face->forget_glyph_frame( loader );
+      opened_frame = 0;
+
+      error = TT_Process_Simple_Glyph( loader );
+      if ( error )
+        goto Exit;
+
+      FT_GlyphLoader_Add( gloader );
+    }
+
+    /***********************************************************************/
+    /***********************************************************************/
+    /***********************************************************************/
+
+    /* otherwise, load a composite! */
+    else if ( loader->n_contours == -1 )
+    {
+      FT_UInt   start_point;
+      FT_UInt   start_contour;
+      FT_ULong  ins_pos;  /* position of composite instructions, if any */
+
+
+      start_point   = gloader->base.outline.n_points;
+      start_contour = gloader->base.outline.n_contours;
+
+      /* for each subglyph, read composite header */
+      error = face->read_composite_glyph( loader );
+      if ( error )
+        goto Exit;
+
+      /* store the offset of instructions */
+      ins_pos = loader->ins_pos;
+
+      /* all data we need are read */
+      face->forget_glyph_frame( loader );
+      opened_frame = 0;
+
+#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
+
+      if ( face->doblend )
+      {
+        FT_Int       i, limit;
+        FT_SubGlyph  subglyph;
+        FT_Memory    memory = face->root.memory;
+
+
+        /* this provides additional offsets */
+        /* for each component's translation */
+
+        if ( ( error = TT_Vary_Get_Glyph_Deltas(
+                         face,
+                         glyph_index,
+                         &deltas,
+                         gloader->current.num_subglyphs + 4 )) != 0 )
+          goto Exit;
+
+        subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs;
+        limit    = gloader->current.num_subglyphs;
+
+        for ( i = 0; i < limit; ++i, ++subglyph )
+        {
+          if ( subglyph->flags & ARGS_ARE_XY_VALUES )
+          {
+            subglyph->arg1 += deltas[i].x;
+            subglyph->arg2 += deltas[i].y;
+          }
+        }
+
+        loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y;
+        loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y;
+        loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y;
+        loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y;
+
+        FT_FREE( deltas );
+      }
+
+#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
+
+      if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+      {
+        loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
+        loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
+        loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
+        loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
+      }
+
+      /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */
+      /* `as is' in the glyph slot (the client application will be     */
+      /* responsible for interpreting these data)...                   */
+      if ( loader->load_flags & FT_LOAD_NO_RECURSE )
+      {
+        FT_GlyphLoader_Add( gloader );
+        loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE;
+
+        goto Exit;
+      }
+
+      /*********************************************************************/
+      /*********************************************************************/
+      /*********************************************************************/
+
+      {
+        FT_UInt      n, num_base_points;
+        FT_SubGlyph  subglyph       = 0;
+
+        FT_UInt      num_points     = start_point;
+        FT_UInt      num_subglyphs  = gloader->current.num_subglyphs;
+        FT_UInt      num_base_subgs = gloader->base.num_subglyphs;
+
+        FT_Stream    old_stream     = loader->stream;
+
+
+        FT_GlyphLoader_Add( gloader );
+
+        /* read each subglyph independently */
+        for ( n = 0; n < num_subglyphs; n++ )
+        {
+          FT_Vector  pp[4];
+
+
+          /* Each time we call load_truetype_glyph in this loop, the   */
+          /* value of `gloader.base.subglyphs' can change due to table */
+          /* reallocations.  We thus need to recompute the subglyph    */
+          /* pointer on each iteration.                                */
+          subglyph = gloader->base.subglyphs + num_base_subgs + n;
+
+          pp[0] = loader->pp1;
+          pp[1] = loader->pp2;
+          pp[2] = loader->pp3;
+          pp[3] = loader->pp4;
+
+          num_base_points = gloader->base.outline.n_points;
+
+          error = load_truetype_glyph( loader, subglyph->index,
+                                       recurse_count + 1 );
+          if ( error )
+            goto Exit;
+
+          /* restore subglyph pointer */
+          subglyph = gloader->base.subglyphs + num_base_subgs + n;
+
+          if ( !( subglyph->flags & USE_MY_METRICS ) )
+          {
+            loader->pp1 = pp[0];
+            loader->pp2 = pp[1];
+            loader->pp3 = pp[2];
+            loader->pp4 = pp[3];
+          }
+
+          num_points = gloader->base.outline.n_points;
+
+          if ( num_points == num_base_points )
+            continue;
+
+          /* gloader->base.outline consists of three parts:               */
+          /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */
+          /*                                                              */
+          /* (1): exists from the beginning                               */
+          /* (2): components that have been loaded so far                 */
+          /* (3): the newly loaded component                              */
+          TT_Process_Composite_Component( loader, subglyph, start_point,
+                                          num_base_points );
+        }
+
+        loader->stream = old_stream;
+
+        /* process the glyph */
+        loader->ins_pos = ins_pos;
+        if ( IS_HINTED( loader->load_flags ) &&
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+             subglyph->flags & WE_HAVE_INSTR &&
+
+#endif
+
+             num_points > start_point )
+          TT_Process_Composite_Glyph( loader, start_point, start_contour );
+
+      }
+    }
+    else
+    {
+      /* invalid composite count (negative but not -1) */
+      error = TT_Err_Invalid_Outline;
+      goto Exit;
+    }
+
+    /***********************************************************************/
+    /***********************************************************************/
+    /***********************************************************************/
+
+  Exit:
+
+    if ( opened_frame )
+      face->forget_glyph_frame( loader );
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+    if ( glyph_data_loaded )
+      face->root.internal->incremental_interface->funcs->free_glyph_data(
+        face->root.internal->incremental_interface->object,
+        &glyph_data );
+
+#endif
+
+    return error;
+  }
+
+
+  static FT_Error
+  compute_glyph_metrics( TT_Loader  loader,
+                         FT_UInt    glyph_index )
+  {
+    FT_BBox       bbox;
+    TT_Face       face = (TT_Face)loader->face;
+    FT_Fixed      y_scale;
+    TT_GlyphSlot  glyph = loader->glyph;
+    TT_Size       size = (TT_Size)loader->size;
+
+
+    y_scale = 0x10000L;
+    if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
+      y_scale = size->root.metrics.y_scale;
+
+    if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )
+      FT_Outline_Get_CBox( &glyph->outline, &bbox );
+    else
+      bbox = loader->bbox;
+
+    /* get the device-independent horizontal advance; it is scaled later */
+    /* by the base layer.                                                */
+    {
+      FT_Pos  advance = loader->linear;
+
+
+      /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */
+      /* correctly support DynaLab fonts, which have an incorrect       */
+      /* `advance_Width_Max' field!  It is used, to my knowledge,       */
+      /* exclusively in the X-TrueType font server.                     */
+      /*                                                                */
+      if ( face->postscript.isFixedPitch                                     &&
+           ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 )
+        advance = face->horizontal.advance_Width_Max;
+
+      /* we need to return the advance in font units in linearHoriAdvance, */
+      /* it will be scaled later by the base layer.                        */
+      glyph->linearHoriAdvance = advance;
+    }
+
+    glyph->metrics.horiBearingX = bbox.xMin;
+    glyph->metrics.horiBearingY = bbox.yMax;
+    glyph->metrics.horiAdvance  = loader->pp2.x - loader->pp1.x;
+
+    /* Now take care of vertical metrics.  In the case where there is    */
+    /* no vertical information within the font (relatively common), make */
+    /* up some metrics by `hand'...                                      */
+
+    {
+      FT_Pos  top;      /* scaled vertical top side bearing  */
+      FT_Pos  advance;  /* scaled vertical advance height    */
+
+
+      /* Get the unscaled top bearing and advance height. */
+      if ( face->vertical_info &&
+           face->vertical.number_Of_VMetrics > 0 )
+      {
+        top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax,
+                                   y_scale );
+
+        if ( loader->pp3.y <= loader->pp4.y )
+          advance = 0;
+        else
+          advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y,
+                                          y_scale );
+      }
+      else
+      {
+        FT_Pos  height;
+
+
+        /* XXX Compute top side bearing and advance height in  */
+        /*     Get_VMetrics instead of here.                   */
+
+        /* NOTE: The OS/2 values are the only `portable' ones, */
+        /*       which is why we use them, if there is an OS/2 */
+        /*       table in the font.  Otherwise, we use the     */
+        /*       values defined in the horizontal header.      */
+
+        height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin,
+                                      y_scale );
+        if ( face->os2.version != 0xFFFFU )
+          advance = (FT_Pos)( face->os2.sTypoAscender -
+                              face->os2.sTypoDescender );
+        else
+          advance = (FT_Pos)( face->horizontal.Ascender -
+                              face->horizontal.Descender );
+
+        top = ( advance - height ) / 2;
+      }
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+      {
+        FT_Incremental_InterfaceRec*  incr;
+        FT_Incremental_MetricsRec     metrics;
+        FT_Error                      error;
+
+
+        incr = face->root.internal->incremental_interface;
+
+        /* If this is an incrementally loaded font see if there are */
+        /* overriding metrics for this glyph.                       */
+        if ( incr && incr->funcs->get_glyph_metrics )
+        {
+          metrics.bearing_x = 0;
+          metrics.bearing_y = top;
+          metrics.advance   = advance;
+
+          error = incr->funcs->get_glyph_metrics( incr->object,
+                                                  glyph_index,
+                                                  TRUE,
+                                                  &metrics );
+          if ( error )
+            return error;
+
+          top     = metrics.bearing_y;
+          advance = metrics.advance;
+        }
+      }
+
+      /* GWW: Do vertical metrics get loaded incrementally too? */
+
+#endif /* FT_CONFIG_OPTION_INCREMENTAL */
+
+      glyph->linearVertAdvance = advance;
+
+      /* scale the metrics */
+      if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
+      {
+        top     = FT_MulFix( top, y_scale );
+        advance = FT_MulFix( advance, y_scale );
+      }
+
+      /* XXX: for now, we have no better algorithm for the lsb, but it */
+      /*      should work fine.                                        */
+      /*                                                               */
+      glyph->metrics.vertBearingX = ( bbox.xMin - bbox.xMax ) / 2;
+      glyph->metrics.vertBearingY = top;
+      glyph->metrics.vertAdvance  = advance;
+    }
+
+    /* adjust advance width to the value contained in the hdmx table */
+    if ( !face->postscript.isFixedPitch  &&
+         IS_HINTED( loader->load_flags ) )
+    {
+      FT_Byte*  widthp;
+
+
+      widthp = tt_face_get_device_metrics( face,
+                                           size->root.metrics.x_ppem,
+                                           glyph_index );
+
+      if ( widthp )
+        glyph->metrics.horiAdvance = *widthp << 6;
+    }
+
+    /* set glyph dimensions */
+    glyph->metrics.width  = bbox.xMax - bbox.xMin;
+    glyph->metrics.height = bbox.yMax - bbox.yMin;
+
+    return 0;
+  }
+
+
+#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
+
+  static FT_Error
+  load_sbit_image( TT_Size       size,
+                   TT_GlyphSlot  glyph,
+                   FT_UInt       glyph_index,
+                   FT_Int32      load_flags )
+  {
+    TT_Face             face;
+    SFNT_Service        sfnt;
+    FT_Stream           stream;
+    FT_Error            error;
+    TT_SBit_MetricsRec  metrics;
+
+
+    face   = (TT_Face)glyph->face;
+    sfnt   = (SFNT_Service)face->sfnt;
+    stream = face->root.stream;
+
+    error = sfnt->load_sbit_image( face,
+                                   size->strike_index,
+                                   glyph_index,
+                                   (FT_Int)load_flags,
+                                   stream,
+                                   &glyph->bitmap,
+                                   &metrics );
+    if ( !error )
+    {
+      glyph->outline.n_points   = 0;
+      glyph->outline.n_contours = 0;
+
+      glyph->metrics.width  = (FT_Pos)metrics.width  << 6;
+      glyph->metrics.height = (FT_Pos)metrics.height << 6;
+
+      glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6;
+      glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6;
+      glyph->metrics.horiAdvance  = (FT_Pos)metrics.horiAdvance  << 6;
+
+      glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6;
+      glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6;
+      glyph->metrics.vertAdvance  = (FT_Pos)metrics.vertAdvance  << 6;
+
+      glyph->format = FT_GLYPH_FORMAT_BITMAP;
+      if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
+      {
+        glyph->bitmap_left = metrics.vertBearingX;
+        glyph->bitmap_top  = metrics.vertBearingY;
+      }
+      else
+      {
+        glyph->bitmap_left = metrics.horiBearingX;
+        glyph->bitmap_top  = metrics.horiBearingY;
+      }
+    }
+
+    return error;
+  }
+
+#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
+
+
+  static FT_Error
+  tt_loader_init( TT_Loader     loader,
+                  TT_Size       size,
+                  TT_GlyphSlot  glyph,
+                  FT_Int32      load_flags )
+  {
+    TT_Face    face;
+    FT_Stream  stream;
+
+
+    face   = (TT_Face)glyph->face;
+    stream = face->root.stream;
+
+    FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) );
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+    /* load execution context */
+    if ( IS_HINTED( load_flags ) )
+    {
+      TT_ExecContext  exec;
+      FT_Bool         grayscale;
+
+
+      if ( !size->cvt_ready )
+      {
+        FT_Error  error = tt_size_ready_bytecode( size );
+        if ( error )
+          return error;
+      }
+
+      /* query new execution context */
+      exec = size->debug ? size->context
+                         : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
+      if ( !exec )
+        return TT_Err_Could_Not_Find_Context;
+
+      grayscale =
+        FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO );
+
+      TT_Load_Context( exec, face, size );
+
+      /* a change from mono to grayscale rendering (and vice versa) */
+      /* requires a re-execution of the CVT program                 */
+      if ( grayscale != exec->grayscale )
+      {
+        FT_UInt  i;
+
+
+        exec->grayscale = grayscale;
+
+        for ( i = 0; i < size->cvt_size; i++ )
+          size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
+        tt_size_run_prep( size );
+      }
+
+      /* see whether the cvt program has disabled hinting */
+      if ( exec->GS.instruct_control & 1 )
+        load_flags |= FT_LOAD_NO_HINTING;
+
+      /* load default graphics state -- if needed */
+      if ( exec->GS.instruct_control & 2 )
+        exec->GS = tt_default_graphics_state;
+
+      exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );
+      loader->exec = exec;
+      loader->instructions = exec->glyphIns;
+    }
+
+#endif /* TT_USE_BYTECODE_INTERPRETER */
+
+    /* seek to the beginning of the glyph table -- for Type 42 fonts     */
+    /* the table might be accessed from a Postscript stream or something */
+    /* else...                                                           */
+
+#ifdef FT_CONFIG_OPTION_INCREMENTAL
+
+    if ( face->root.internal->incremental_interface )
+      loader->glyf_offset = 0;
+    else
+
+#endif
+
+    {
+      FT_Error  error = face->goto_table( face, TTAG_glyf, stream, 0 );
+
+
+      if ( error == TT_Err_Table_Missing )
+        loader->glyf_offset = 0;
+      else if ( error )
+      {
+        FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" ));
+        return error;
+      }
+      else
+        loader->glyf_offset = FT_STREAM_POS();
+    }
+
+    /* get face's glyph loader */
+    {
+      FT_GlyphLoader  gloader = glyph->internal->loader;
+
+
+      FT_GlyphLoader_Rewind( gloader );
+      loader->gloader = gloader;
+    }
+
+    loader->load_flags = load_flags;
+
+    loader->face   = (FT_Face)face;
+    loader->size   = (FT_Size)size;
+    loader->glyph  = (FT_GlyphSlot)glyph;
+    loader->stream = stream;
+
+    return TT_Err_Ok;
+  }
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* <Function>                                                            */
+  /*    TT_Load_Glyph                                                      */
+  /*                                                                       */
+  /* <Description>                                                         */
+  /*    A function used to load a single glyph within a given glyph slot,  */
+  /*    for a given size.                                                  */
+  /*                                                                       */
+  /* <Input>                                                               */
+  /*    glyph       :: A handle to a target slot object where the glyph    */
+  /*                   will be loaded.                                     */
+  /*                                                                       */
+  /*    size        :: A handle to the source face size at which the glyph */
+  /*                   must be scaled/loaded.                              */
+  /*                                                                       */
+  /*    glyph_index :: The index of the glyph in the font file.            */
+  /*                                                                       */
+  /*    load_flags  :: A flag indicating what to load for this glyph.  The */
+  /*                   FT_LOAD_XXX constants can be used to control the    */
+  /*                   glyph loading process (e.g., whether the outline    */
+  /*                   should be scaled, whether to load bitmaps or not,   */
+  /*                   whether to hint the outline, etc).                  */
+  /*                                                                       */
+  /* <Return>                                                              */
+  /*    FreeType error code.  0 means success.                             */
+  /*                                                                       */
+  FT_LOCAL_DEF( FT_Error )
+  TT_Load_Glyph( TT_Size       size,
+                 TT_GlyphSlot  glyph,
+                 FT_UInt       glyph_index,
+                 FT_Int32      load_flags )
+  {
+    TT_Face       face;
+    FT_Error      error;
+    TT_LoaderRec  loader;
+
+
+    face   = (TT_Face)glyph->face;
+    error  = TT_Err_Ok;
+
+#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
+
+    /* try to load embedded bitmap if any              */
+    /*                                                 */
+    /* XXX: The convention should be emphasized in     */
+    /*      the documents because it can be confusing. */
+    if ( size->strike_index != 0xFFFFFFFFUL      &&
+         ( load_flags & FT_LOAD_NO_BITMAP ) == 0 )
+    {
+      error = load_sbit_image( size, glyph, glyph_index, load_flags );
+      if ( !error )
+        return TT_Err_Ok;
+    }
+
+#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
+
+    /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */
+    if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid )
+      return TT_Err_Invalid_Size_Handle;
+
+    if ( load_flags & FT_LOAD_SBITS_ONLY )
+      return TT_Err_Invalid_Argument;
+
+    error = tt_loader_init( &loader, size, glyph, load_flags );
+    if ( error )
+      return error;
+
+    glyph->format        = FT_GLYPH_FORMAT_OUTLINE;
+    glyph->num_subglyphs = 0;
+    glyph->outline.flags = 0;
+
+    /* main loading loop */
+    error = load_truetype_glyph( &loader, glyph_index, 0 );
+    if ( !error )
+    {
+      if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE )
+      {
+        glyph->num_subglyphs = loader.gloader->base.num_subglyphs;
+        glyph->subglyphs     = loader.gloader->base.subglyphs;
+      }
+      else
+      {
+        glyph->outline        = loader.gloader->base.outline;
+        glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS;
+
+        /* In case bit 1 of the `flags' field in the `head' table isn't */
+        /* set, translate array so that (0,0) is the glyph's origin.    */
+        if ( ( face->header.Flags & 2 ) == 0 && loader.pp1.x )
+          FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 );
+      }
+
+#ifdef TT_USE_BYTECODE_INTERPRETER
+
+      if ( IS_HINTED( load_flags ) )
+      {
+        if ( loader.exec->GS.scan_control )
+        {
+          /* convert scan conversion mode to FT_OUTLINE_XXX flags */
+          switch ( loader.exec->GS.scan_type )
+          {
+          case 0: /* simple drop-outs including stubs */
+            glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS;
+            break;
+          case 1: /* simple drop-outs excluding stubs */
+            /* nothing; it's the default rendering mode */
+            break;
+          case 4: /* smart drop-outs including stubs */
+            glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS |
+                                    FT_OUTLINE_INCLUDE_STUBS;
+            break;
+          case 5: /* smart drop-outs excluding stubs  */
+            glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS;
+            break;
+
+          default: /* no drop-out control */
+            glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS;
+            break;
+          }
+        }
+        else 
+          glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS;
+      }
+
+#endif /* TT_USE_BYTECODE_INTERPRETER */
+
+      compute_glyph_metrics( &loader, glyph_index );
+    }
+
+    /* Set the `high precision' bit flag.                           */
+    /* This is _critical_ to get correct output for monochrome      */
+    /* TrueType glyphs at all sizes using the bytecode interpreter. */
+    /*                                                              */
+    if ( !( load_flags & FT_LOAD_NO_SCALE ) &&
+         size->root.metrics.y_ppem < 24     )
+      glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
+
+    return error;
+  }
+
+
+/* END */