text: /***************************************************************************/
  /*                                                                         */
  /*  ttgload.c                                                              */
  /*                                                                         */
  /*    TrueType Glyph Loader (body).                                        */
  /*                                                                         */
  /*  Copyright 1996-2015 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;
  
          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 */
  