text: /***************************************************************************/
  /*                                                                         */
  /*  ttgload.c                                                              */
  /*                                                                         */
  /*    TrueType Glyph Loader (body).                                        */
  /*                                                                         */
  /*  Copyright 1996-2016 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 FT_TRUETYPE_DRIVER_H
  #include FT_LIST_H
  
  #include "ttgload.h"
  #include "ttpload.h"
  
  #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
  #include "ttgxvar.h"
  #endif
  
  #include "tterrors.h"
  #include "ttsubpix.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 glyph 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
  
  
    /*************************************************************************/
    /*                                                                       */
    /* Return the horizontal metrics in font units for a given glyph.        */
    /*                                                                       */
    FT_LOCAL_DEF( void )
    TT_Get_HMetrics( TT_Face     face,
                     FT_UInt     idx,
                     FT_Short*   lsb,
                     FT_UShort*  aw )
    {
      ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw );
  
      FT_TRACE5(( "  advance width (font units): %d\n", *aw ));
      FT_TRACE5(( "  left side bearing (font units): %d\n", *lsb ));
    }
  
  
    /*************************************************************************/
    /*                                                                       */
    /* Return the vertical metrics in font units for a given glyph.          */
    /* See macro `TT_LOADER_SET_PP' below for explanations.                  */
    /*                                                                       */
    FT_LOCAL_DEF( void )
    TT_Get_VMetrics( TT_Face     face,
                     FT_UInt     idx,
                     FT_Pos      yMax,
                     FT_Short*   tsb,
                     FT_UShort*  ah )
    {
      if ( face->vertical_info )
        ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah );
  
      else if ( face->os2.version != 0xFFFFU )
      {
        *tsb = (FT_Short)( face->os2.sTypoAscender - yMax );
        *ah  = (FT_UShort)FT_ABS( face->os2.sTypoAscender -
                                  face->os2.sTypoDescender );
      }
  
      else
      {
        *tsb = (FT_Short)( face->horizontal.Ascender - yMax );
        *ah  = (FT_UShort)FT_ABS( face->horizontal.Ascender -
                                  face->horizontal.Descender );
      }
  
      FT_TRACE5(( "  advance height (font units): %d\n", *ah ));
      FT_TRACE5(( "  top side bearing (font units): %d\n", *tsb ));
    }
  
  
    static FT_Error
    tt_get_metrics( TT_Loader  loader,
                    FT_UInt    glyph_index )
    {
      TT_Face    face   = loader->face;
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
      TT_Driver  driver = (TT_Driver)FT_FACE_DRIVER( face );
  #endif
  
      FT_Error   error;
      FT_Stream  stream = loader->stream;
  
      FT_Short   left_bearing = 0, top_bearing = 0;
      FT_UShort  advance_width = 0, advance_height = 0;
  
      /* we must preserve the stream position          */
      /* (which gets altered by the metrics functions) */
      FT_ULong  pos = FT_STREAM_POS();
  
  
      TT_Get_HMetrics( face, glyph_index,
                       &left_bearing,
                       &advance_width );
      TT_Get_VMetrics( face, glyph_index,
                       loader->bbox.yMax,
                       &top_bearing,
                       &advance_height );
  
      if ( FT_STREAM_SEEK( pos ) )
        return error;
  
      loader->left_bearing = left_bearing;
      loader->advance      = advance_width;
      loader->top_bearing  = top_bearing;
      loader->vadvance     = advance_height;
  
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
      if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 &&
           loader->exec                                             )
      {
        loader->exec->sph_tweak_flags = 0;
  
        /* This may not be the right place for this, but it works...  */
        /* Note that we have to unconditionally load the tweaks since */
        /* it is possible that glyphs individually switch ClearType's */
        /* backwards compatibility mode on and off.                   */
        sph_set_tweaks( loader, glyph_index );
      }
  #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
      if ( !loader->linear_def )
      {
        loader->linear_def = 1;
        loader->linear     = advance_width;
      }
  
      return FT_Err_Ok;
    }
  
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
  
    static void
    tt_get_metrics_incr_overrides( TT_Loader  loader,
                                   FT_UInt    glyph_index )
    {
      TT_Face  face = loader->face;
  
      FT_Short   left_bearing = 0, top_bearing = 0;
      FT_UShort  advance_width = 0, advance_height = 0;
  
  
      /* If this is an incrementally loaded font check whether 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;
        FT_Error                   error;
  
  
        metrics.bearing_x = loader->left_bearing;
        metrics.bearing_y = 0;
        metrics.advance   = loader->advance;
        metrics.advance_v = 0;
  
        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 = loader->top_bearing;
        metrics.advance   = loader->vadvance;
  
        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 */
  
        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;
        }
      }
  
    Exit:
      return;
    }
  
  #endif /* FT_CONFIG_OPTION_INCREMENTAL */
  
  
    /*************************************************************************/
    /*                                                                       */
    /* 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_TRACE4(( "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 FT_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 FT_THROW( 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 FT_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;
      FT_UShort       n_ins;
      FT_Int          n_points;
      FT_ULong        tmp;
  
      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_SHORT( p );
  
      if ( n_contours > 0 )
        cont[0] = prev_cont;
  
      if ( prev_cont < 0 )
        goto Invalid_Outline;
  
      for ( cont++; cont < cont_limit; cont++ )
      {
        cont[0] = FT_NEXT_SHORT( p );
        if ( cont[0] <= prev_cont )
        {
          /* unordered contours: this is invalid */
          goto Invalid_Outline;
        }
        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;
  
      /* reading the bytecode instructions */
      load->glyph->control_len  = 0;
      load->glyph->control_data = NULL;
  
      if ( p + 2 > limit )
        goto Invalid_Outline;
  
      n_ins = FT_NEXT_USHORT( p );
  
      FT_TRACE5(( "  Instructions size: %u\n", n_ins ));
  
      /* check it */
      if ( ( limit - p ) < n_ins )
      {
        FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" ));
        error = FT_THROW( Too_Many_Hints );
        goto Fail;
      }
  
  #ifdef TT_USE_BYTECODE_INTERPRETER
  
      if ( IS_HINTED( load->load_flags ) )
      {
        /* we don't trust `maxSizeOfInstructions' in the `maxp' table */
        /* and thus update the bytecode array size by ourselves       */
  
        tmp   = load->exec->glyphSize;
        error = Update_Max( load->exec->memory,
                            &tmp,
                            sizeof ( FT_Byte ),
                            (void*)&load->exec->glyphIns,
                            n_ins );
  
        load->exec->glyphSize = (FT_UShort)tmp;
        if ( error )
          return error;
  
        load->glyph->control_len  = n_ins;
        load->glyph->control_data = load->exec->glyphIns;
  
        if ( n_ins )
          FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins );
      }
  
  #endif /* TT_USE_BYTECODE_INTERPRETER */
  
      p += n_ins;
  
      outline = &gloader->current.outline;
  
      /* 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_Short)n_points;
      outline->n_contours = (FT_Short)n_contours;
  
      load->cursor = p;
  
    Fail:
      return error;
  
    Invalid_Outline:
      error = FT_THROW( 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_XY_VALUES )
        {
          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 );
          }
        }
        else
        {
          if ( subglyph->flags & ARGS_ARE_WORDS )
          {
            subglyph->arg1 = (FT_Int)FT_NEXT_USHORT( p );
            subglyph->arg2 = (FT_Int)FT_NEXT_USHORT( p );
          }
          else
          {
            subglyph->arg1 = (FT_Int)FT_NEXT_BYTE( p );
            subglyph->arg2 = (FT_Int)FT_NEXT_BYTE( p );
          }
        }
  
        /* read transform */
        xx = yy = 0x10000L;
        xy = yx = 0;
  
        if ( subglyph->flags & WE_HAVE_A_SCALE )
        {
          xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
          yy = xx;
        }
        else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
        {
          xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
          yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
        }
        else if ( subglyph->flags & WE_HAVE_A_2X2 )
        {
          xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
          yx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
          xy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
          yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
        }
  
        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;
      FT_TRACE5(( "  %d components\n", 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 = FT_THROW( 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 -
                            (FT_UShort)start_point;
      zone->n_contours  = load->outline.n_contours -
                            (FT_Short)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 )
    {
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
      TT_Face    face   = loader->face;
      TT_Driver  driver = (TT_Driver)FT_FACE_DRIVER( face );
  #endif
  
      TT_GlyphZone  zone = &loader->zone;
  
  #ifdef TT_USE_BYTECODE_INTERPRETER
      FT_Long       n_ins;
  #else
      FT_UNUSED( is_composite );
  #endif
  
  
  #ifdef TT_USE_BYTECODE_INTERPRETER
      if ( loader->glyph->control_len > 0xFFFFL )
      {
        FT_TRACE1(( "TT_Hint_Glyph: too long instructions" ));
        FT_TRACE1(( " (0x%lx byte) is truncated\n",
                   loader->glyph->control_len ));
      }
      n_ins = loader->glyph->control_len;
  
      /* 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 = 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 = loader->size->metrics.x_scale;
        loader->exec->metrics.y_scale = loader->size->metrics.y_scale;
      }
  #endif
  
      /* round phantom points */
      zone->cur[zone->n_points - 4].x =
        FT_PIX_ROUND( zone->cur[zone->n_points - 4].x );
      zone->cur[zone->n_points - 3].x =
        FT_PIX_ROUND( zone->cur[zone->n_points - 3].x );
      zone->cur[zone->n_points - 2].y =
        FT_PIX_ROUND( zone->cur[zone->n_points - 2].y );
      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_Error  error;
  
        FT_GlyphLoader  gloader         = loader->gloader;
        FT_Outline      current_outline = gloader->current.outline;
  
  
        TT_Set_CodeRange( loader->exec, tt_coderange_glyph,
                          loader->exec->glyphIns, n_ins );
  
        loader->exec->is_composite = is_composite;
        loader->exec->pts          = *zone;
  
        error = TT_Run_Context( loader->exec );
        if ( error && loader->exec->pedantic_hinting )
          return error;
  
        /* store drop-out mode in bits 5-7; set bit 2 also as a marker */
        current_outline.tags[0] |=
          ( loader->exec->GS.scan_type << 5 ) | FT_CURVE_TAG_HAS_SCANMODE;
      }
  
  #endif
  
      /* save glyph phantom points */
      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];
  
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
      if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
      {
        if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN )
          FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 );
  
        else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN )
          FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 );
      }
  #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
      return FT_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   = FT_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 ( loader->face->doblend )
      {
        /* Deltas apply to the unscaled data. */
        error = TT_Vary_Apply_Glyph_Deltas( loader->face,
                                            loader->glyph_index,
                                            outline,
                                            (FT_UInt)n_points );
        if ( error )
          return error;
      }
  
  #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 );
      }
  
      {
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
        TT_Face    face   = loader->face;
        TT_Driver  driver = (TT_Driver)FT_FACE_DRIVER( face );
  
        FT_String*  family         = face->root.family_name;
        FT_UInt     ppem           = loader->size->metrics.x_ppem;
        FT_String*  style          = face->root.style_name;
        FT_UInt     x_scale_factor = 1000;
  #endif
  
        FT_Vector*  vec   = outline->points;
        FT_Vector*  limit = outline->points + n_points;
  
        FT_Fixed  x_scale = 0; /* pacify compiler */
        FT_Fixed  y_scale = 0;
  
        FT_Bool  do_scale = FALSE;
  
  
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
  
        if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
        {
          /* scale, but only if enabled and only if TT hinting is being used */
          if ( IS_HINTED( loader->load_flags ) )
            x_scale_factor = sph_test_tweak_x_scaling( face,
                                                       family,
                                                       ppem,
                                                       style,
                                                       loader->glyph_index );
          /* scale the glyph */
          if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ||
               x_scale_factor != 1000                         )
          {
            x_scale = FT_MulDiv( loader->size->metrics.x_scale,
                                 (FT_Long)x_scale_factor, 1000 );
            y_scale = loader->size->metrics.y_scale;
  
            /* compensate for any scaling by de/emboldening; */
            /* the amount was determined via experimentation */
            if ( x_scale_factor != 1000 && ppem > 11 )
              FT_Outline_EmboldenXY( outline,
                                     FT_MulFix( 1280 * ppem,
                                                1000 - x_scale_factor ),
                                     0 );
            do_scale = TRUE;
          }
        }
        else
  
  #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
        {
          /* scale the glyph */
          if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
          {
            x_scale = loader->size->metrics.x_scale;
            y_scale = loader->size->metrics.y_scale;
  
            do_scale = TRUE;
          }
        }
  
        if ( do_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_Outline      current;
      FT_Bool         have_scale;
      FT_Pos          x, y;
  
  
      current.points   = gloader->base.outline.points +
                           num_base_points;
      current.n_points = gloader->base.outline.n_points -
                           (short)num_base_points;
  
      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_Outline_Transform( &current, &subglyph->transform );
  
      /* get offset */
      if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )
      {
        FT_UInt     num_points = (FT_UInt)gloader->base.outline.n_points;
        FT_UInt     k = (FT_UInt)subglyph->arg1;
        FT_UInt     l = (FT_UInt)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 FT_THROW( 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 FT_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 /* 1 */
  
          /*******************************************************************/
          /*                                                                 */
          /* This algorithm is a guess and works much better than the above. */
          /*                                                                 */
          FT_Fixed  mac_xscale = FT_Hypot( subglyph->transform.xx,
                                           subglyph->transform.xy );
          FT_Fixed  mac_yscale = FT_Hypot( subglyph->transform.yy,
                                           subglyph->transform.yx );
  
  
          x = FT_MulFix( x, mac_xscale );
          y = FT_MulFix( y, mac_yscale );
  
  #endif /* 1 */
  
        }
  
        if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
        {
          FT_Fixed  x_scale = loader->size->metrics.x_scale;
          FT_Fixed  y_scale = 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 )
        FT_Outline_Translate( &current, x, y );
  
      return FT_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, max_ins;
        FT_ULong   tmp;
  
  
        /* 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 */
        max_ins = loader->face->max_profile.maxSizeOfInstructions;
        if ( n_ins > max_ins )
        {
          /* don't trust `maxSizeOfInstructions'; */
          /* only do a rough safety check         */
          if ( (FT_Int)n_ins > loader->byte_len )
          {
            FT_TRACE1(( "TT_Process_Composite_Glyph:"
                        " too many instructions (%d) for glyph with length %d\n",
                        n_ins, loader->byte_len ));
            return FT_THROW( Too_Many_Hints );
          }
  
          tmp   = loader->exec->glyphSize;
          error = Update_Max( loader->exec->memory,
                              &tmp,
                              sizeof ( FT_Byte ),
                              (void*)&loader->exec->glyphIns,
                              n_ins );
  
          loader->exec->glyphSize = (FT_UShort)tmp;
          if ( error )
            return error;
        }
        else if ( n_ins == 0 )
          return FT_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 = 0; i < loader->zone.n_points; i++ )
        loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH;
  
      loader->zone.n_points += 4;
  
      return TT_Hint_Glyph( loader, 1 );
    }
  
  
    /*
     * Calculate the phantom points
     *
     * Defining the right side bearing (rsb) as
     *
     *   rsb = aw - (lsb + xmax - xmin)
     *
     * (with `aw' the advance width, `lsb' the left side bearing, and `xmin'
     * and `xmax' the glyph's minimum and maximum x value), the OpenType
     * specification defines the initial position of horizontal phantom points
     * as
     *
     *   pp1 = (round(xmin - lsb), 0)      ,
     *   pp2 = (round(pp1 + aw), 0)        .
     *
     * Note that the rounding to the grid (in the device space) is not
     * documented currently in the specification.
     *
     * However, the specification lacks the precise definition of vertical
     * phantom points.  Greg Hitchcock provided the following explanation.
     *
     * - a `vmtx' table is present
     *
     *   For any glyph, the minimum and maximum y values (`ymin' and `ymax')
     *   are given in the `glyf' table, the top side bearing (tsb) and advance
     *   height (ah) are given in the `vmtx' table.  The bottom side bearing
     *   (bsb) is then calculated as
     *
     *     bsb = ah - (tsb + ymax - ymin)       ,
     *
     *   and the initial position of vertical phantom points is
     *
     *     pp3 = (x, round(ymax + tsb))       ,
     *     pp4 = (x, round(pp3 - ah))         .
     *
     *   See below for value `x'.
     *
     * - no `vmtx' table in the font
     *
     *   If there is an `OS/2' table, we set
     *
     *     DefaultAscender = sTypoAscender       ,
     *     DefaultDescender = sTypoDescender     ,
     *
     *   otherwise we use data from the `hhea' table:
     *
     *     DefaultAscender = Ascender         ,
     *     DefaultDescender = Descender       .
     *
     *   With these two variables we can now set
     *
     *     ah = DefaultAscender - sDefaultDescender    ,
     *     tsb = DefaultAscender - yMax                ,
     *
     *   and proceed as if a `vmtx' table was present.
     *
     * Usually we have
     *
     *   x = aw / 2      ,                                                (1)
     *
     * but there is one compatibility case where it can be set to
     *
     *   x = -DefaultDescender -
     *         ((DefaultAscender - DefaultDescender - aw) / 2)     .      (2)
     *
     * and another one with
     *
     *   x = 0     .                                                      (3)
     *
     * In Windows, the history of those values is quite complicated,
     * depending on the hinting engine (that is, the graphics framework).
     *
     *   framework        from                 to       formula
     *  ----------------------------------------------------------
     *    GDI       Windows 98               current      (1)
     *              (Windows 2000 for NT)
     *    GDI+      Windows XP               Windows 7    (2)
     *    GDI+      Windows 8                current      (3)
     *    DWrite    Windows 7                current      (3)
     *
     * For simplicity, FreeType uses (1) for grayscale subpixel hinting and
     * (3) for everything else.
     *
     */
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
  
  #define TT_LOADER_SET_PP( loader )                                          \
            do                                                                \
            {                                                                 \
              FT_Bool  subpixel_hinting_ = loader->exec                       \
                                             ? loader->exec->subpixel_hinting \
                                             : 0;                             \
              FT_Bool  grayscale_        = loader->exec                       \
                                             ? loader->exec->grayscale        \
                                             : 0;                             \
              FT_Bool  use_aw_2_         = (FT_Bool)( subpixel_hinting_ &&    \
                                                      grayscale_        );    \
                                                                              \
                                                                              \
              (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 = use_aw_2_ ? (loader)->advance / 2 : 0;        \
              (loader)->pp3.y = (loader)->bbox.yMax + (loader)->top_bearing;  \
              (loader)->pp4.x = use_aw_2_ ? (loader)->advance / 2 : 0;        \
              (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance;         \
            } while ( 0 )
  
  #else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
  #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)->bbox.yMax + (loader)->top_bearing;  \
              (loader)->pp4.x = 0;                                            \
              (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance;         \
            } while ( 0 )
  
  #endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <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_Bool    header_only )
    {
      FT_Error        error        = FT_Err_Ok;
      FT_Fixed        x_scale, y_scale;
      FT_ULong        offset;
      TT_Face         face         = loader->face;
      FT_GlyphLoader  gloader      = loader->gloader;
      FT_Bool         opened_frame = 0;
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
      FT_StreamRec    inc_stream;
      FT_Data         glyph_data;
      FT_Bool         glyph_data_loaded = 0;
  #endif
  
  
  #ifdef FT_DEBUG_LEVEL_TRACE
      if ( recurse_count )
        FT_TRACE5(( "  nesting level: %d\n", recurse_count ));
  #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 = FT_THROW( Invalid_Composite );
        goto Exit;
      }
  
  #ifndef FT_CONFIG_OPTION_INCREMENTAL
      /* check glyph index */
      if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
      {
        error = FT_THROW( Invalid_Glyph_Index );
        goto Exit;
      }
  #endif
  
      loader->glyph_index = glyph_index;
  
      if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
      {
        x_scale = loader->size->metrics.x_scale;
        y_scale = loader->size->metrics.y_scale;
      }
      else
      {
        x_scale = 0x10000L;
        y_scale = 0x10000L;
      }
  
      /* 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,
                              (FT_ULong)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 )
      {
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
        /* for the incremental interface, `glyf_offset' is always zero */
        if ( !loader->glyf_offset                        &&
             !face->root.internal->incremental_interface )
  #else
        if ( !loader->glyf_offset )
  #endif /* FT_CONFIG_OPTION_INCREMENTAL */
        {
          FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" ));
          error = FT_THROW( Invalid_Table );
          goto Exit;
        }
  
        error = face->access_glyph_frame( loader, glyph_index,
                                          loader->glyf_offset + offset,
                                          (FT_UInt)loader->byte_len );
        if ( error )
          goto Exit;
  
        opened_frame = 1;
  
        /* read glyph header first */
        error = face->read_glyph_header( loader );
        if ( error )
          goto Exit;
  
        /* the metrics must be computed after loading the glyph header */
        /* since we need the glyph's `yMax' value in case the vertical */
        /* metrics must be emulated                                    */
        error = tt_get_metrics( loader, glyph_index );
        if ( error )
          goto Exit;
  
        if ( header_only )
          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;
  
        error = tt_get_metrics( loader, glyph_index );
        if ( error )
          goto Exit;
  
        if ( header_only )
          goto Exit;
  
        /* must initialize points before (possibly) overriding */
        /* glyph metrics from the incremental interface        */
        TT_LOADER_SET_PP( loader );
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
        tt_get_metrics_incr_overrides( loader, glyph_index );
  #endif
  
  #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
  
        if ( loader->face->doblend )
        {
          /* a small outline structure with four elements for */
          /* communication with `TT_Vary_Apply_Glyph_Deltas'  */
          FT_Vector   points[4];
          char        tags[4]     = { 1, 1, 1, 1 };
          short       contours[4] = { 0, 1, 2, 3 };
          FT_Outline  outline;
  
  
          points[0].x = loader->pp1.x;
          points[0].y = loader->pp1.y;
          points[1].x = loader->pp2.x;
          points[1].y = loader->pp2.y;
  
          points[2].x = loader->pp3.x;
          points[2].y = loader->pp3.y;
          points[3].x = loader->pp4.x;
          points[3].y = loader->pp4.y;
  
          outline.n_points   = 4;
          outline.n_contours = 4;
          outline.points     = points;
          outline.tags       = tags;
          outline.contours   = contours;
  
          /* this must be done before scaling */
          error = TT_Vary_Apply_Glyph_Deltas( loader->face,
                                              glyph_index,
                                              &outline,
                                              (FT_UInt)outline.n_points );
          if ( error )
            goto Exit;
  
          loader->pp1.x = points[0].x;
          loader->pp1.y = points[0].y;
          loader->pp2.x = points[1].x;
          loader->pp2.y = points[1].y;
  
          loader->pp3.x = points[2].x;
          loader->pp3.y = points[2].y;
          loader->pp4.x = points[3].x;
          loader->pp4.y = points[3].y;
        }
  
  #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
  
        /* scale phantom points, if necessary; */
        /* they get rounded in `TT_Hint_Glyph' */
        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 );
          /* pp1.y and pp2.y are always zero */
  
          loader->pp3.x = FT_MulFix( loader->pp3.x, x_scale );
          loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
          loader->pp4.x = FT_MulFix( loader->pp4.x, x_scale );
          loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
        }
  
        error = FT_Err_Ok;
        goto Exit;
      }
  
      /* must initialize phantom points before (possibly) overriding */
      /* glyph metrics from the incremental interface                */
      TT_LOADER_SET_PP( loader );
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
      tt_get_metrics_incr_overrides( loader, glyph_index );
  #endif
  
      /***********************************************************************/
      /***********************************************************************/
      /***********************************************************************/
  
      /* 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_Memory  memory = face->root.memory;
  
        FT_UInt   start_point;
        FT_UInt   start_contour;
        FT_ULong  ins_pos;  /* position of composite instructions, if any */
  
  
        /*
         * We store the glyph index directly in the `node->data' pointer,
         * following the glib solution (cf. macro `GUINT_TO_POINTER') with a
         * double cast to make this portable.  Note, however, that this needs
         * pointers with a width of at least 32 bits.
         */
  
        /* check whether we already have a composite glyph with this index */
        if ( FT_List_Find( &loader->composites,
                           (void*)(unsigned long)glyph_index ) )
        {
          FT_TRACE1(( "TT_Load_Composite_Glyph:"
                      " infinite recursion detected\n" ));
          error = FT_THROW( Invalid_Composite );
          goto Exit;
        }
        else
        {
          FT_ListNode  node = NULL;
  
  
          if ( FT_NEW( node ) )
            goto Exit;
          node->data = (void*)(unsigned long)glyph_index;
          FT_List_Add( &loader->composites, node );
        }
  
        start_point   = (FT_UInt)gloader->base.outline.n_points;
        start_contour = (FT_UInt)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 )
        {
          short        i, limit;
          FT_SubGlyph  subglyph;
  
          FT_Outline  outline;
          FT_Vector*  points   = NULL;
          char*       tags     = NULL;
          short*      contours = NULL;
  
  
          limit = (short)gloader->current.num_subglyphs;
  
          /* construct an outline structure for              */
          /* communication with `TT_Vary_Apply_Glyph_Deltas' */
          outline.n_points   = (short)( gloader->current.num_subglyphs + 4 );
          outline.n_contours = outline.n_points;
  
          if ( FT_NEW_ARRAY( points, outline.n_points )   ||
               FT_NEW_ARRAY( tags, outline.n_points )     ||
               FT_NEW_ARRAY( contours, outline.n_points ) )
            goto Exit1;
  
          subglyph = gloader->current.subglyphs;
  
          for ( i = 0; i < limit; i++, subglyph++ )
          {
            /* applying deltas for anchor points doesn't make sense, */
            /* but we don't have to specially check this since       */
            /* unused delta values are zero anyways                  */
            points[i].x = subglyph->arg1;
            points[i].y = subglyph->arg2;
            tags[i]     = 1;
            contours[i] = i;
          }
  
          points[i].x = loader->pp1.x;
          points[i].y = loader->pp1.y;
          tags[i]     = 1;
          contours[i] = i;
  
          i++;
          points[i].x = loader->pp2.x;
          points[i].y = loader->pp2.y;
          tags[i]     = 1;
          contours[i] = i;
  
          i++;
          points[i].x = loader->pp3.x;
          points[i].y = loader->pp3.y;
          tags[i]     = 1;
          contours[i] = i;
  
          i++;
          points[i].x = loader->pp4.x;
          points[i].y = loader->pp4.y;
          tags[i]     = 1;
          contours[i] = i;
  
          outline.points   = points;
          outline.tags     = tags;
          outline.contours = contours;
  
          /* this call provides additional offsets */
          /* for each component's translation      */
          if ( ( error = TT_Vary_Apply_Glyph_Deltas(
                           face,
                           glyph_index,
                           &outline,
                           (FT_UInt)outline.n_points ) ) != 0 )
            goto Exit1;
  
          subglyph = gloader->current.subglyphs;
  
          for ( i = 0; i < limit; i++, subglyph++ )
          {
            /* XXX: overflow check for subglyph->{arg1,arg2}.         */
            /*      Deltas must be within signed 16-bit,              */
            /*      but the restriction of summed deltas is not clear */
            subglyph->arg1 = (FT_Int16)points[i].x;
            subglyph->arg2 = (FT_Int16)points[i].y;
          }
  
          loader->pp1.x = points[i + 0].x;
          loader->pp1.y = points[i + 0].y;
          loader->pp2.x = points[i + 1].x;
          loader->pp2.y = points[i + 1].y;
  
          loader->pp3.x = points[i + 2].x;
          loader->pp3.y = points[i + 2].y;
          loader->pp4.x = points[i + 3].x;
          loader->pp4.y = points[i + 3].y;
  
        Exit1:
          FT_FREE( outline.points );
          FT_FREE( outline.tags );
          FT_FREE( outline.contours );
  
          if ( error )
            goto Exit;
        }
  
  #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
  
        /* scale phantom points, if necessary; */
        /* they get rounded in `TT_Hint_Glyph' */
        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 );
          /* pp1.y and pp2.y are always zero */
  
          loader->pp3.x = FT_MulFix( loader->pp3.x, x_scale );
          loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
          loader->pp4.x = FT_MulFix( loader->pp4.x, x_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       = NULL;
  
          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_Int       old_byte_len   = loader->byte_len;
  
  
          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 = (FT_UInt)gloader->base.outline.n_points;
  
            error = load_truetype_glyph( loader,
                                         (FT_UInt)subglyph->index,
                                         recurse_count + 1,
                                         FALSE );
            if ( error )
              goto Exit;
  
            /* restore subglyph pointer */
            subglyph = gloader->base.subglyphs + num_base_subgs + n;
  
            /* restore phantom points if necessary */
            if ( !( subglyph->flags & USE_MY_METRICS ) )
            {
              loader->pp1 = pp[0];
              loader->pp2 = pp[1];
              loader->pp3 = pp[2];
              loader->pp4 = pp[3];
            }
  
            num_points = (FT_UInt)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                              */
            error = TT_Process_Composite_Component( loader,
                                                    subglyph,
                                                    start_point,
                                                    num_base_points );
            if ( error )
              goto Exit;
          }
  
          loader->stream   = old_stream;
          loader->byte_len = old_byte_len;
  
          /* 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 )
          {
            error = TT_Process_Composite_Glyph( loader,
                                                start_point,
                                                start_contour );
            if ( error )
              goto Exit;
          }
        }
      }
      else
      {
        /* invalid composite count (negative but not -1) */
        error = FT_THROW( 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 )
    {
      TT_Face    face   = loader->face;
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
      TT_Driver  driver = (TT_Driver)FT_FACE_DRIVER( face );
  #endif
  
      FT_BBox       bbox;
      FT_Fixed      y_scale;
      TT_GlyphSlot  glyph = loader->glyph;
      TT_Size       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.                                                */
      glyph->linearHoriAdvance = loader->linear;
  
      glyph->metrics.horiBearingX = bbox.xMin;
      glyph->metrics.horiBearingY = bbox.yMax;
      glyph->metrics.horiAdvance  = loader->pp2.x - loader->pp1.x;
  
      /* adjust advance width to the value contained in the hdmx table */
      /* unless FT_LOAD_COMPUTE_METRICS is set                         */
      if ( !face->postscript.isFixedPitch                    &&
           IS_HINTED( loader->load_flags )                   &&
           !( loader->load_flags & FT_LOAD_COMPUTE_METRICS ) )
      {
        FT_Byte*  widthp;
  
  
        widthp = tt_face_get_device_metrics( face,
                                             size->root.metrics.x_ppem,
                                             glyph_index );
  
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
  
        if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
        {
          FT_Bool  ignore_x_mode;
  
  
          ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) !=
                                   FT_RENDER_MODE_MONO );
  
          if ( widthp                                                   &&
               ( ( ignore_x_mode && loader->exec->compatible_widths ) ||
                  !ignore_x_mode                                      ||
                  SPH_OPTION_BITMAP_WIDTHS                            ) )
            glyph->metrics.horiAdvance = *widthp * 64;
        }
        else
  
  #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
        {
          if ( widthp )
            glyph->metrics.horiAdvance = *widthp * 64;
        }
      }
  
      /* set glyph dimensions */
      glyph->metrics.width  = bbox.xMax - bbox.xMin;
      glyph->metrics.height = bbox.yMax - bbox.yMin;
  
      /* Now take care of vertical metrics.  In the case where there is */
      /* no vertical information within the font (relatively common),   */
      /* create some metrics manually                                   */
      {
        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 = glyph->metrics.horiBearingX -
                                        glyph->metrics.horiAdvance / 2;
        glyph->metrics.vertBearingY = top;
        glyph->metrics.vertAdvance  = advance;
      }
  
      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_UInt)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  * 64;
        glyph->metrics.height = (FT_Pos)metrics.height * 64;
  
        glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX * 64;
        glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY * 64;
        glyph->metrics.horiAdvance  = (FT_Pos)metrics.horiAdvance  * 64;
  
        glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX * 64;
        glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY * 64;
        glyph->metrics.vertAdvance  = (FT_Pos)metrics.vertAdvance  * 64;
  
        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,
                    FT_Bool       glyf_table_only )
    {
      FT_Error  error;
  
      TT_Face    face;
      FT_Stream  stream;
  #ifdef TT_USE_BYTECODE_INTERPRETER
      FT_Bool    pedantic = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );
  #endif
  
  
      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 ) && !glyf_table_only )
      {
        TT_ExecContext  exec;
        FT_Bool         grayscale;
  
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
        TT_Driver  driver = (TT_Driver)FT_FACE_DRIVER( face );
  
        FT_Bool  subpixel_hinting = FALSE;
  
  #if 0
        /* not used yet */
        FT_Bool  compatible_widths;
        FT_Bool  symmetrical_smoothing;
        FT_Bool  bgr;
        FT_Bool  vertical_lcd;
        FT_Bool  subpixel_positioned;
        FT_Bool  gray_cleartype;
  #endif
  #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
        FT_Bool  reexecute = FALSE;
  
  
        if ( size->bytecode_ready < 0 || size->cvt_ready < 0 )
        {
          error = tt_size_ready_bytecode( size, pedantic );
          if ( error )
            return error;
        }
        else if ( size->bytecode_ready )
          return size->bytecode_ready;
        else if ( size->cvt_ready )
          return size->cvt_ready;
  
        /* query new execution context */
        exec = size->context;
        if ( !exec )
          return FT_THROW( Could_Not_Find_Context );
  
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
  
        if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
        {
          subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags ) !=
                                        FT_RENDER_MODE_MONO               )  &&
                                      SPH_OPTION_SET_SUBPIXEL                );
  
          if ( subpixel_hinting )
            grayscale = FALSE;
          else if ( SPH_OPTION_SET_GRAYSCALE )
          {
            grayscale        = TRUE;
            subpixel_hinting = FALSE;
          }
          else
            grayscale = FALSE;
  
          if ( FT_IS_TRICKY( glyph->face ) )
            subpixel_hinting = FALSE;
  
          exec->ignore_x_mode      = subpixel_hinting || grayscale;
          exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;
          if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 )
            exec->rasterizer_version = TT_INTERPRETER_VERSION_35;
  
  #if 1
          exec->compatible_widths     = SPH_OPTION_SET_COMPATIBLE_WIDTHS;
          exec->symmetrical_smoothing = TRUE;
          exec->bgr                   = FALSE;
          exec->vertical_lcd          = FALSE;
          exec->subpixel_positioned   = TRUE;
          exec->gray_cleartype        = FALSE;
  #else /* 0 */
          exec->compatible_widths =
            FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
                     TT_LOAD_COMPATIBLE_WIDTHS );
          exec->symmetrical_smoothing =
            FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
                     TT_LOAD_SYMMETRICAL_SMOOTHING );
          exec->bgr =
            FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
                     TT_LOAD_BGR );
          exec->vertical_lcd =
            FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
                     TT_LOAD_VERTICAL_LCD );
          exec->subpixel_positioned =
            FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
                     TT_LOAD_SUBPIXEL_POSITIONED );
          exec->gray_cleartype =
            FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
                     TT_LOAD_GRAY_CLEARTYPE );
  #endif /* 0 */
  
        }
        else
  
  #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
        {
          grayscale = FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
                               FT_RENDER_MODE_MONO );
        }
  
        error = TT_Load_Context( exec, face, size );
        if ( error )
          return error;
  
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
  
        if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )
        {
          /* a change from mono to subpixel rendering (and vice versa) */
          /* requires a re-execution of the CVT program                */
          if ( subpixel_hinting != exec->subpixel_hinting )
          {
            FT_TRACE4(( "tt_loader_init: subpixel hinting change,"
                        " re-executing `prep' table\n" ));
  
            exec->subpixel_hinting = subpixel_hinting;
            reexecute              = TRUE;
          }
  
          /* a change from mono to grayscale rendering (and vice versa) */
          /* requires a re-execution of the CVT program                 */
          if ( grayscale != exec->grayscale )
          {
            FT_TRACE4(( "tt_loader_init: grayscale hinting change,"
                        " re-executing `prep' table\n" ));
  
            exec->grayscale = grayscale;
            reexecute       = TRUE;
          }
        }
        else
  
  #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
  
        {
          /* a change from mono to grayscale rendering (and vice versa) */
          /* requires a re-execution of the CVT program                 */
          if ( grayscale != exec->grayscale )
          {
            FT_TRACE4(( "tt_loader_init: grayscale hinting change,"
                        " re-executing `prep' table\n" ));
  
            exec->grayscale = grayscale;
            reexecute       = TRUE;
          }
        }
  
        if ( reexecute )
        {
          FT_UInt  i;
  
  
          for ( i = 0; i < size->cvt_size; i++ )
            size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
          error = tt_size_run_prep( size, pedantic );
          if ( error )
            return error;
        }
  
        /* check 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;
  
  #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
        /* check whether we have a font hinted for ClearType --           */
        /* note that this flag can also be modified in a glyph's bytecode */
        if ( exec->GS.instruct_control & 4 )
          exec->ignore_x_mode = 0;
  #endif
  
        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
  
      {
        error = face->goto_table( face, TTAG_glyf, stream, 0 );
  
        if ( FT_ERR_EQ( error, Table_Missing ) )
          loader->glyf_offset = 0;
        else if ( error )
        {
          FT_ERROR(( "tt_loader_init: could not access glyph table\n" ));
          return error;
        }
        else
          loader->glyf_offset = FT_STREAM_POS();
      }
  
      /* get face's glyph loader */
      if ( !glyf_table_only )
      {
        FT_GlyphLoader  gloader = glyph->internal->loader;
  
  
        FT_GlyphLoader_Rewind( gloader );
        loader->gloader = gloader;
      }
  
      loader->load_flags = (FT_ULong)load_flags;
  
      loader->face   = face;
      loader->size   = size;
      loader->glyph  = (FT_GlyphSlot)glyph;
      loader->stream = stream;
  
      loader->composites.head = NULL;
      loader->composites.tail = NULL;
  
      return FT_Err_Ok;
    }
  
  
    static void
    tt_loader_done( TT_Loader  loader )
    {
      FT_List_Finalize( &loader->composites,
                        NULL,
                        loader->face->root.memory,
                        NULL );
    }
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <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 )
    {
      FT_Error      error;
      TT_LoaderRec  loader;
  
  
      FT_TRACE1(( "TT_Load_Glyph: glyph index %d\n", glyph_index ));
  
  #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 )
        {
          if ( FT_IS_SCALABLE( glyph->face ) )
          {
            /* for the bbox we need the header only */
            (void)tt_loader_init( &loader, size, glyph, load_flags, TRUE );
            (void)load_truetype_glyph( &loader, glyph_index, 0, TRUE );
            tt_loader_done( &loader );
            glyph->linearHoriAdvance = loader.linear;
            glyph->linearVertAdvance = loader.vadvance;
  
            /* sanity checks: if `xxxAdvance' in the sbit metric */
            /* structure isn't set, use `linearXXXAdvance'      */
            if ( !glyph->metrics.horiAdvance && glyph->linearHoriAdvance )
              glyph->metrics.horiAdvance =
                FT_MulFix( glyph->linearHoriAdvance,
                           size->root.metrics.x_scale );
            if ( !glyph->metrics.vertAdvance && glyph->linearVertAdvance )
              glyph->metrics.vertAdvance =
                FT_MulFix( glyph->linearVertAdvance,
                           size->root.metrics.y_scale );
          }
  
          return FT_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 FT_THROW( Invalid_Size_Handle );
  
      if ( load_flags & FT_LOAD_SBITS_ONLY )
        return FT_THROW( Invalid_Argument );
  
      error = tt_loader_init( &loader, size, glyph, load_flags, FALSE );
      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, FALSE );
      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;
  
          /* Translate array so that (0,0) is the glyph's origin.  Note  */
          /* that this behaviour is independent on the value of bit 1 of */
          /* the `flags' field in the `head' table -- at least major     */
          /* applications like Acroread indicate that.                   */
          if ( 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 */
  
        error = compute_glyph_metrics( &loader, glyph_index );
      }
  
      tt_loader_done( &loader );
  
      /* 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 */
  