kc3-lang/freetype/src/cff/cffobjs.c

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• Hash : 575b78d9
  Author :
  Date : 2020-06-18T15:12:03
  

  [cff] Fix memory leak (#58610). * src/cff/cffobjs.c (cff_size_init): When the call to `funcs->create' fails, make sure to free `internal'.

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• src/cff/cffobjs.c

• /****************************************************************************
   *
   * cffobjs.c
   *
   *   OpenType objects manager (body).
   *
   * Copyright (C) 1996-2020 by
   * David Turner, Robert Wilhelm, and Werner Lemberg.
   *
   * This file is part of the FreeType project, and may only be used,
   * modified, and distributed under the terms of the FreeType project
   * license, LICENSE.TXT.  By continuing to use, modify, or distribute
   * this file you indicate that you have read the license and
   * understand and accept it fully.
   *
   */
  
  
  
  #include <freetype/internal/ftdebug.h>
  #include <freetype/internal/ftcalc.h>
  #include <freetype/internal/ftstream.h>
  #include <freetype/fterrors.h>
  #include <freetype/ttnameid.h>
  #include <freetype/tttags.h>
  #include <freetype/internal/sfnt.h>
  #include <freetype/ftdriver.h>
  
  #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
  #include <freetype/ftmm.h>
  #include <freetype/internal/services/svmm.h>
  #include <freetype/internal/services/svmetric.h>
  #endif
  
  #include <freetype/internal/cffotypes.h>
  #include "cffobjs.h"
  #include "cffload.h"
  #include "cffcmap.h"
  
  #include "cfferrs.h"
  
  #include <freetype/internal/psaux.h>
  #include <freetype/internal/services/svcfftl.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  cffobjs
  
  
    /**************************************************************************
     *
     *                           SIZE FUNCTIONS
     *
     */
  
  
    static PSH_Globals_Funcs
    cff_size_get_globals_funcs( CFF_Size  size )
    {
      CFF_Face          face     = (CFF_Face)size->root.face;
      CFF_Font          font     = (CFF_Font)face->extra.data;
      PSHinter_Service  pshinter = font->pshinter;
      FT_Module         module;
  
  
      module = FT_Get_Module( size->root.face->driver->root.library,
                              "pshinter" );
      return ( module && pshinter && pshinter->get_globals_funcs )
             ? pshinter->get_globals_funcs( module )
             : 0;
    }
  
  
    FT_LOCAL_DEF( void )
    cff_size_done( FT_Size  cffsize )        /* CFF_Size */
    {
      FT_Memory     memory   = cffsize->face->memory;
      CFF_Size      size     = (CFF_Size)cffsize;
      CFF_Face      face     = (CFF_Face)size->root.face;
      CFF_Font      font     = (CFF_Font)face->extra.data;
      CFF_Internal  internal = (CFF_Internal)cffsize->internal->module_data;
  
  
      if ( internal )
      {
        PSH_Globals_Funcs  funcs;
  
  
        funcs = cff_size_get_globals_funcs( size );
        if ( funcs )
        {
          FT_UInt  i;
  
  
          funcs->destroy( internal->topfont );
  
          for ( i = font->num_subfonts; i > 0; i-- )
            funcs->destroy( internal->subfonts[i - 1] );
        }
  
        FT_FREE( internal );
      }
    }
  
  
    /* CFF and Type 1 private dictionaries have slightly different      */
    /* structures; we need to synthesize a Type 1 dictionary on the fly */
  
    static void
    cff_make_private_dict( CFF_SubFont  subfont,
                           PS_Private   priv )
    {
      CFF_Private  cpriv = &subfont->private_dict;
      FT_UInt      n, count;
  
  
      FT_ZERO( priv );
  
      count = priv->num_blue_values = cpriv->num_blue_values;
      for ( n = 0; n < count; n++ )
        priv->blue_values[n] = (FT_Short)cpriv->blue_values[n];
  
      count = priv->num_other_blues = cpriv->num_other_blues;
      for ( n = 0; n < count; n++ )
        priv->other_blues[n] = (FT_Short)cpriv->other_blues[n];
  
      count = priv->num_family_blues = cpriv->num_family_blues;
      for ( n = 0; n < count; n++ )
        priv->family_blues[n] = (FT_Short)cpriv->family_blues[n];
  
      count = priv->num_family_other_blues = cpriv->num_family_other_blues;
      for ( n = 0; n < count; n++ )
        priv->family_other_blues[n] = (FT_Short)cpriv->family_other_blues[n];
  
      priv->blue_scale = cpriv->blue_scale;
      priv->blue_shift = (FT_Int)cpriv->blue_shift;
      priv->blue_fuzz  = (FT_Int)cpriv->blue_fuzz;
  
      priv->standard_width[0]  = (FT_UShort)cpriv->standard_width;
      priv->standard_height[0] = (FT_UShort)cpriv->standard_height;
  
      count = priv->num_snap_widths = cpriv->num_snap_widths;
      for ( n = 0; n < count; n++ )
        priv->snap_widths[n] = (FT_Short)cpriv->snap_widths[n];
  
      count = priv->num_snap_heights = cpriv->num_snap_heights;
      for ( n = 0; n < count; n++ )
        priv->snap_heights[n] = (FT_Short)cpriv->snap_heights[n];
  
      priv->force_bold     = cpriv->force_bold;
      priv->language_group = cpriv->language_group;
      priv->lenIV          = cpriv->lenIV;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    cff_size_init( FT_Size  cffsize )         /* CFF_Size */
    {
      CFF_Size           size  = (CFF_Size)cffsize;
      FT_Error           error = FT_Err_Ok;
      PSH_Globals_Funcs  funcs = cff_size_get_globals_funcs( size );
  
      FT_Memory     memory   = cffsize->face->memory;
      CFF_Internal  internal = NULL;
  
  
      if ( funcs )
      {
        CFF_Face  face = (CFF_Face)cffsize->face;
        CFF_Font  font = (CFF_Font)face->extra.data;
  
        PS_PrivateRec  priv;
  
        FT_UInt  i;
  
  
        if ( FT_NEW( internal ) )
          goto Exit;
  
        cff_make_private_dict( &font->top_font, &priv );
        error = funcs->create( cffsize->face->memory, &priv,
                               &internal->topfont );
        if ( error )
          goto Exit;
  
        for ( i = font->num_subfonts; i > 0; i-- )
        {
          CFF_SubFont  sub = font->subfonts[i - 1];
  
  
          cff_make_private_dict( sub, &priv );
          error = funcs->create( cffsize->face->memory, &priv,
                                 &internal->subfonts[i - 1] );
          if ( error )
            goto Exit;
        }
  
        cffsize->internal->module_data = internal;
      }
  
      size->strike_index = 0xFFFFFFFFUL;
  
    Exit:
      if ( error )
        FT_FREE( internal );
  
      return error;
    }
  
  
  #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
  
    FT_LOCAL_DEF( FT_Error )
    cff_size_select( FT_Size   size,
                     FT_ULong  strike_index )
    {
      CFF_Size           cffsize = (CFF_Size)size;
      PSH_Globals_Funcs  funcs;
  
  
      cffsize->strike_index = strike_index;
  
      FT_Select_Metrics( size->face, strike_index );
  
      funcs = cff_size_get_globals_funcs( cffsize );
  
      if ( funcs )
      {
        CFF_Face      face     = (CFF_Face)size->face;
        CFF_Font      font     = (CFF_Font)face->extra.data;
        CFF_Internal  internal = (CFF_Internal)size->internal->module_data;
  
        FT_Long  top_upm  = (FT_Long)font->top_font.font_dict.units_per_em;
        FT_UInt  i;
  
  
        funcs->set_scale( internal->topfont,
                          size->metrics.x_scale, size->metrics.y_scale,
                          0, 0 );
  
        for ( i = font->num_subfonts; i > 0; i-- )
        {
          CFF_SubFont  sub     = font->subfonts[i - 1];
          FT_Long      sub_upm = (FT_Long)sub->font_dict.units_per_em;
          FT_Pos       x_scale, y_scale;
  
  
          if ( top_upm != sub_upm )
          {
            x_scale = FT_MulDiv( size->metrics.x_scale, top_upm, sub_upm );
            y_scale = FT_MulDiv( size->metrics.y_scale, top_upm, sub_upm );
          }
          else
          {
            x_scale = size->metrics.x_scale;
            y_scale = size->metrics.y_scale;
          }
  
          funcs->set_scale( internal->subfonts[i - 1],
                            x_scale, y_scale, 0, 0 );
        }
      }
  
      return FT_Err_Ok;
    }
  
  #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
  
  
    FT_LOCAL_DEF( FT_Error )
    cff_size_request( FT_Size          size,
                      FT_Size_Request  req )
    {
      CFF_Size           cffsize = (CFF_Size)size;
      PSH_Globals_Funcs  funcs;
  
  
  #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
  
      if ( FT_HAS_FIXED_SIZES( size->face ) )
      {
        CFF_Face      cffface = (CFF_Face)size->face;
        SFNT_Service  sfnt    = (SFNT_Service)cffface->sfnt;
        FT_ULong      strike_index;
  
  
        if ( sfnt->set_sbit_strike( cffface, req, &strike_index ) )
          cffsize->strike_index = 0xFFFFFFFFUL;
        else
          return cff_size_select( size, strike_index );
      }
  
  #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
  
      FT_Request_Metrics( size->face, req );
  
      funcs = cff_size_get_globals_funcs( cffsize );
  
      if ( funcs )
      {
        CFF_Face      cffface  = (CFF_Face)size->face;
        CFF_Font      font     = (CFF_Font)cffface->extra.data;
        CFF_Internal  internal = (CFF_Internal)size->internal->module_data;
  
        FT_Long  top_upm  = (FT_Long)font->top_font.font_dict.units_per_em;
        FT_UInt  i;
  
  
        funcs->set_scale( internal->topfont,
                          size->metrics.x_scale, size->metrics.y_scale,
                          0, 0 );
  
        for ( i = font->num_subfonts; i > 0; i-- )
        {
          CFF_SubFont  sub     = font->subfonts[i - 1];
          FT_Long      sub_upm = (FT_Long)sub->font_dict.units_per_em;
          FT_Pos       x_scale, y_scale;
  
  
          if ( top_upm != sub_upm )
          {
            x_scale = FT_MulDiv( size->metrics.x_scale, top_upm, sub_upm );
            y_scale = FT_MulDiv( size->metrics.y_scale, top_upm, sub_upm );
          }
          else
          {
            x_scale = size->metrics.x_scale;
            y_scale = size->metrics.y_scale;
          }
  
          funcs->set_scale( internal->subfonts[i - 1],
                            x_scale, y_scale, 0, 0 );
        }
      }
  
      return FT_Err_Ok;
    }
  
  
    /**************************************************************************
     *
     *                           SLOT  FUNCTIONS
     *
     */
  
    FT_LOCAL_DEF( void )
    cff_slot_done( FT_GlyphSlot  slot )
    {
      slot->internal->glyph_hints = NULL;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    cff_slot_init( FT_GlyphSlot  slot )
    {
      CFF_Face          face     = (CFF_Face)slot->face;
      CFF_Font          font     = (CFF_Font)face->extra.data;
      PSHinter_Service  pshinter = font->pshinter;
  
  
      if ( pshinter )
      {
        FT_Module  module;
  
  
        module = FT_Get_Module( slot->face->driver->root.library,
                                "pshinter" );
        if ( module )
        {
          T2_Hints_Funcs  funcs;
  
  
          funcs = pshinter->get_t2_funcs( module );
          slot->internal->glyph_hints = (void*)funcs;
        }
      }
  
      return FT_Err_Ok;
    }
  
  
    /**************************************************************************
     *
     *                          FACE  FUNCTIONS
     *
     */
  
    static FT_String*
    cff_strcpy( FT_Memory         memory,
                const FT_String*  source )
    {
      FT_Error    error;
      FT_String*  result;
  
  
      (void)FT_STRDUP( result, source );
  
      FT_UNUSED( error );
  
      return result;
    }
  
  
    /* Strip all subset prefixes of the form `ABCDEF+'.  Usually, there */
    /* is only one, but font names like `APCOOG+JFABTD+FuturaBQ-Bold'   */
    /* have been seen in the wild.                                      */
  
    static void
    remove_subset_prefix( FT_String*  name )
    {
      FT_Int32  idx             = 0;
      FT_Int32  length          = (FT_Int32)ft_strlen( name ) + 1;
      FT_Bool   continue_search = 1;
  
  
      while ( continue_search )
      {
        if ( length >= 7 && name[6] == '+' )
        {
          for ( idx = 0; idx < 6; idx++ )
          {
            /* ASCII uppercase letters */
            if ( !( 'A' <= name[idx] && name[idx] <= 'Z' ) )
              continue_search = 0;
          }
  
          if ( continue_search )
          {
            for ( idx = 7; idx < length; idx++ )
              name[idx - 7] = name[idx];
            length -= 7;
          }
        }
        else
          continue_search = 0;
      }
    }
  
  
    /* Remove the style part from the family name (if present). */
  
    static void
    remove_style( FT_String*        family_name,
                  const FT_String*  style_name )
    {
      FT_Int32  family_name_length, style_name_length;
  
  
      family_name_length = (FT_Int32)ft_strlen( family_name );
      style_name_length  = (FT_Int32)ft_strlen( style_name );
  
      if ( family_name_length > style_name_length )
      {
        FT_Int  idx;
  
  
        for ( idx = 1; idx <= style_name_length; idx++ )
        {
          if ( family_name[family_name_length - idx] !=
               style_name[style_name_length - idx] )
            break;
        }
  
        if ( idx > style_name_length )
        {
          /* family_name ends with style_name; remove it */
          idx = family_name_length - style_name_length - 1;
  
          /* also remove special characters     */
          /* between real family name and style */
          while ( idx > 0                     &&
                  ( family_name[idx] == '-' ||
                    family_name[idx] == ' ' ||
                    family_name[idx] == '_' ||
                    family_name[idx] == '+' ) )
            idx--;
  
          if ( idx > 0 )
            family_name[idx + 1] = '\0';
        }
      }
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    cff_face_init( FT_Stream      stream,
                   FT_Face        cffface,        /* CFF_Face */
                   FT_Int         face_index,
                   FT_Int         num_params,
                   FT_Parameter*  params )
    {
      CFF_Face            face        = (CFF_Face)cffface;
      FT_Error            error;
      SFNT_Service        sfnt;
      FT_Service_PsCMaps  psnames;
      PSHinter_Service    pshinter;
      PSAux_Service       psaux;
      FT_Service_CFFLoad  cffload;
      FT_Bool             pure_cff    = 1;
      FT_Bool             cff2        = 0;
      FT_Bool             sfnt_format = 0;
      FT_Library          library     = cffface->driver->root.library;
  
  
      sfnt = (SFNT_Service)FT_Get_Module_Interface( library,
                                                    "sfnt" );
      if ( !sfnt )
      {
        FT_ERROR(( "cff_face_init: cannot access `sfnt' module\n" ));
        error = FT_THROW( Missing_Module );
        goto Exit;
      }
  
      FT_FACE_FIND_GLOBAL_SERVICE( face, psnames, POSTSCRIPT_CMAPS );
  
      pshinter = (PSHinter_Service)FT_Get_Module_Interface( library,
                                                            "pshinter" );
  
      psaux = (PSAux_Service)FT_Get_Module_Interface( library,
                                                      "psaux" );
      if ( !psaux )
      {
        FT_ERROR(( "cff_face_init: cannot access `psaux' module\n" ));
        error = FT_THROW( Missing_Module );
        goto Exit;
      }
      face->psaux = psaux;
  
      FT_FACE_FIND_GLOBAL_SERVICE( face, cffload, CFF_LOAD );
  
      FT_TRACE2(( "CFF driver\n" ));
  
      /* create input stream from resource */
      if ( FT_STREAM_SEEK( 0 ) )
        goto Exit;
  
      /* check whether we have a valid OpenType file */
      FT_TRACE2(( "  " ));
      error = sfnt->init_face( stream, face, face_index, num_params, params );
      if ( !error )
      {
        if ( face->format_tag != TTAG_OTTO )  /* `OTTO'; OpenType/CFF font */
        {
          FT_TRACE2(( "  not an OpenType/CFF font\n" ));
          error = FT_THROW( Unknown_File_Format );
          goto Exit;
        }
  
        /* if we are performing a simple font format check, exit immediately */
        if ( face_index < 0 )
          return FT_Err_Ok;
  
        sfnt_format = 1;
  
        /* now, the font can be either an OpenType/CFF font, or an SVG CEF */
        /* font; in the latter case it doesn't have a `head' table         */
        error = face->goto_table( face, TTAG_head, stream, 0 );
        if ( !error )
        {
          pure_cff = 0;
  
          /* load font directory */
          error = sfnt->load_face( stream, face, face_index,
                                   num_params, params );
          if ( error )
            goto Exit;
        }
        else
        {
          /* load the `cmap' table explicitly */
          error = sfnt->load_cmap( face, stream );
          if ( error )
            goto Exit;
        }
  
        /* now load the CFF part of the file; */
        /* give priority to CFF2              */
        error = face->goto_table( face, TTAG_CFF2, stream, 0 );
        if ( !error )
        {
          cff2          = 1;
          face->is_cff2 = cff2;
        }
  
        if ( FT_ERR_EQ( error, Table_Missing ) )
          error = face->goto_table( face, TTAG_CFF, stream, 0 );
  
        if ( error )
          goto Exit;
      }
      else
      {
        /* rewind to start of file; we are going to load a pure-CFF font */
        if ( FT_STREAM_SEEK( 0 ) )
          goto Exit;
        error = FT_Err_Ok;
      }
  
      /* now load and parse the CFF table in the file */
      {
        CFF_Font         cff = NULL;
        CFF_FontRecDict  dict;
        FT_Memory        memory = cffface->memory;
        FT_Int32         flags;
        FT_UInt          i;
  
  
        if ( FT_NEW( cff ) )
          goto Exit;
  
        face->extra.data = cff;
        error = cff_font_load( library,
                               stream,
                               face_index,
                               cff,
                               face,
                               pure_cff,
                               cff2 );
        if ( error )
          goto Exit;
  
        /* if we are performing a simple font format check, exit immediately */
        /* (this is here for pure CFF)                                       */
        if ( face_index < 0 )
        {
          cffface->num_faces = (FT_Long)cff->num_faces;
          return FT_Err_Ok;
        }
  
        cff->pshinter = pshinter;
        cff->psnames  = psnames;
        cff->cffload  = cffload;
  
        cffface->face_index = face_index & 0xFFFF;
  
        /* Complement the root flags with some interesting information. */
        /* Note that this is only necessary for pure CFF and CEF fonts; */
        /* SFNT based fonts use the `name' table instead.               */
  
        cffface->num_glyphs = (FT_Long)cff->num_glyphs;
  
        dict = &cff->top_font.font_dict;
  
        /* we need the `psnames' module for CFF and CEF formats */
        /* which aren't CID-keyed                               */
        if ( dict->cid_registry == 0xFFFFU && !psnames )
        {
          FT_ERROR(( "cff_face_init:"
                     " cannot open CFF & CEF fonts\n"
                     "              "
                     " without the `psnames' module\n" ));
          error = FT_THROW( Missing_Module );
          goto Exit;
        }
  
  #ifdef FT_DEBUG_LEVEL_TRACE
        {
          FT_UInt     idx;
          FT_String*  s;
  
  
          FT_TRACE4(( "SIDs\n" ));
  
          /* dump string index, including default strings for convenience */
          for ( idx = 0; idx <= 390; idx++ )
          {
            s = cff_index_get_sid_string( cff, idx );
            if ( s )
              FT_TRACE4(( "  %5d %s\n", idx, s ));
          }
  
          /* In Multiple Master CFFs, two SIDs hold the Normalize Design  */
          /* Vector (NDV) and Convert Design Vector (CDV) charstrings,    */
          /* which may contain NULL bytes in the middle of the data, too. */
          /* We thus access `cff->strings' directly.                      */
          for ( idx = 1; idx < cff->num_strings; idx++ )
          {
            FT_Byte*    s1    = cff->strings[idx - 1];
            FT_Byte*    s2    = cff->strings[idx];
            FT_PtrDist  s1len = s2 - s1 - 1; /* without the final NULL byte */
            FT_PtrDist  l;
  
  
            FT_TRACE4(( "  %5d ", idx + 390 ));
            for ( l = 0; l < s1len; l++ )
              FT_TRACE4(( "%c", s1[l] ));
            FT_TRACE4(( "\n" ));
          }
  
          /* print last element */
          if ( cff->num_strings )
          {
            FT_Byte*    s1    = cff->strings[cff->num_strings - 1];
            FT_Byte*    s2    = cff->string_pool + cff->string_pool_size;
            FT_PtrDist  s1len = s2 - s1 - 1;
            FT_PtrDist  l;
  
  
            FT_TRACE4(( "  %5d ", cff->num_strings + 390 ));
            for ( l = 0; l < s1len; l++ )
              FT_TRACE4(( "%c", s1[l] ));
            FT_TRACE4(( "\n" ));
          }
        }
  #endif /* FT_DEBUG_LEVEL_TRACE */
  
  #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
        {
          FT_Service_MultiMasters       mm  = (FT_Service_MultiMasters)face->mm;
          FT_Service_MetricsVariations  var = (FT_Service_MetricsVariations)face->var;
  
          FT_UInt  instance_index = (FT_UInt)face_index >> 16;
  
  
          if ( FT_HAS_MULTIPLE_MASTERS( cffface ) &&
               mm                                 &&
               instance_index > 0                 )
          {
            error = mm->set_instance( cffface, instance_index );
            if ( error )
              goto Exit;
  
            if ( var )
              var->metrics_adjust( cffface );
          }
        }
  #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
  
        if ( !dict->has_font_matrix )
          dict->units_per_em = pure_cff ? 1000 : face->root.units_per_EM;
  
        /* Normalize the font matrix so that `matrix->yy' is 1; if  */
        /* it is zero, we use `matrix->yx' instead.  The scaling is */
        /* done with `units_per_em' then (at this point, it already */
        /* contains the scaling factor, but without normalization   */
        /* of the matrix).                                          */
        /*                                                          */
        /* Note that the offsets must be expressed in integer font  */
        /* units.                                                   */
  
        {
          FT_Matrix*  matrix = &dict->font_matrix;
          FT_Vector*  offset = &dict->font_offset;
          FT_ULong*   upm    = &dict->units_per_em;
          FT_Fixed    temp;
  
  
          temp = matrix->yy ? FT_ABS( matrix->yy )
                            : FT_ABS( matrix->yx );
  
          if ( temp != 0x10000L )
          {
            *upm = (FT_ULong)FT_DivFix( (FT_Long)*upm, temp );
  
            matrix->xx = FT_DivFix( matrix->xx, temp );
            matrix->yx = FT_DivFix( matrix->yx, temp );
            matrix->xy = FT_DivFix( matrix->xy, temp );
            matrix->yy = FT_DivFix( matrix->yy, temp );
            offset->x  = FT_DivFix( offset->x,  temp );
            offset->y  = FT_DivFix( offset->y,  temp );
          }
  
          offset->x >>= 16;
          offset->y >>= 16;
        }
  
        for ( i = cff->num_subfonts; i > 0; i-- )
        {
          CFF_FontRecDict  sub = &cff->subfonts[i - 1]->font_dict;
          CFF_FontRecDict  top = &cff->top_font.font_dict;
  
          FT_Matrix*  matrix;
          FT_Vector*  offset;
          FT_ULong*   upm;
          FT_Fixed    temp;
  
  
          if ( sub->has_font_matrix )
          {
            FT_Long  scaling;
  
  
            /* if we have a top-level matrix, */
            /* concatenate the subfont matrix */
  
            if ( top->has_font_matrix )
            {
              if ( top->units_per_em > 1 && sub->units_per_em > 1 )
                scaling = (FT_Long)FT_MIN( top->units_per_em,
                                           sub->units_per_em );
              else
                scaling = 1;
  
              FT_Matrix_Multiply_Scaled( &top->font_matrix,
                                         &sub->font_matrix,
                                         scaling );
              FT_Vector_Transform_Scaled( &sub->font_offset,
                                          &top->font_matrix,
                                          scaling );
  
              sub->units_per_em = (FT_ULong)
                                    FT_MulDiv( (FT_Long)sub->units_per_em,
                                               (FT_Long)top->units_per_em,
                                               scaling );
            }
          }
          else
          {
            sub->font_matrix = top->font_matrix;
            sub->font_offset = top->font_offset;
  
            sub->units_per_em = top->units_per_em;
          }
  
          matrix = &sub->font_matrix;
          offset = &sub->font_offset;
          upm    = &sub->units_per_em;
  
          temp = matrix->yy ? FT_ABS( matrix->yy )
                            : FT_ABS( matrix->yx );
  
  
          if ( temp != 0x10000L )
          {
            *upm = (FT_ULong)FT_DivFix( (FT_Long)*upm, temp );
  
            matrix->xx = FT_DivFix( matrix->xx, temp );
            matrix->yx = FT_DivFix( matrix->yx, temp );
            matrix->xy = FT_DivFix( matrix->xy, temp );
            matrix->yy = FT_DivFix( matrix->yy, temp );
            offset->x  = FT_DivFix( offset->x,  temp );
            offset->y  = FT_DivFix( offset->y,  temp );
          }
  
          offset->x >>= 16;
          offset->y >>= 16;
        }
  
        if ( pure_cff )
        {
          char*  style_name = NULL;
  
  
          /* set up num_faces */
          cffface->num_faces = (FT_Long)cff->num_faces;
  
          /* compute number of glyphs */
          if ( dict->cid_registry != 0xFFFFU )
            cffface->num_glyphs = (FT_Long)( cff->charset.max_cid + 1 );
          else
            cffface->num_glyphs = (FT_Long)cff->charstrings_index.count;
  
          /* set global bbox, as well as EM size */
          cffface->bbox.xMin =   dict->font_bbox.xMin            >> 16;
          cffface->bbox.yMin =   dict->font_bbox.yMin            >> 16;
          /* no `U' suffix here to 0xFFFF! */
          cffface->bbox.xMax = ( dict->font_bbox.xMax + 0xFFFF ) >> 16;
          cffface->bbox.yMax = ( dict->font_bbox.yMax + 0xFFFF ) >> 16;
  
          cffface->units_per_EM = (FT_UShort)( dict->units_per_em );
  
          cffface->ascender  = (FT_Short)( cffface->bbox.yMax );
          cffface->descender = (FT_Short)( cffface->bbox.yMin );
  
          cffface->height = (FT_Short)( ( cffface->units_per_EM * 12 ) / 10 );
          if ( cffface->height < cffface->ascender - cffface->descender )
            cffface->height = (FT_Short)( cffface->ascender -
                                          cffface->descender );
  
          cffface->underline_position  =
            (FT_Short)( dict->underline_position >> 16 );
          cffface->underline_thickness =
            (FT_Short)( dict->underline_thickness >> 16 );
  
          /* retrieve font family & style name */
          if ( dict->family_name )
          {
            char*  family_name;
  
  
            family_name = cff_index_get_sid_string( cff, dict->family_name );
            if ( family_name )
              cffface->family_name = cff_strcpy( memory, family_name );
          }
  
          if ( !cffface->family_name )
          {
            cffface->family_name = cff_index_get_name(
                                     cff,
                                     (FT_UInt)( face_index & 0xFFFF ) );
            if ( cffface->family_name )
              remove_subset_prefix( cffface->family_name );
          }
  
          if ( cffface->family_name )
          {
            char*  full   = cff_index_get_sid_string( cff,
                                                      dict->full_name );
            char*  fullp  = full;
            char*  family = cffface->family_name;
  
  
            /* We try to extract the style name from the full name.   */
            /* We need to ignore spaces and dashes during the search. */
            if ( full && family )
            {
              while ( *fullp )
              {
                /* skip common characters at the start of both strings */
                if ( *fullp == *family )
                {
                  family++;
                  fullp++;
                  continue;
                }
  
                /* ignore spaces and dashes in full name during comparison */
                if ( *fullp == ' ' || *fullp == '-' )
                {
                  fullp++;
                  continue;
                }
  
                /* ignore spaces and dashes in family name during comparison */
                if ( *family == ' ' || *family == '-' )
                {
                  family++;
                  continue;
                }
  
                if ( !*family && *fullp )
                {
                  /* The full name begins with the same characters as the  */
                  /* family name, with spaces and dashes removed.  In this */
                  /* case, the remaining string in `fullp' will be used as */
                  /* the style name.                                       */
                  style_name = cff_strcpy( memory, fullp );
  
                  /* remove the style part from the family name (if present) */
                  remove_style( cffface->family_name, style_name );
                }
                break;
              }
            }
          }
          else
          {
            char  *cid_font_name =
                     cff_index_get_sid_string( cff,
                                               dict->cid_font_name );
  
  
            /* do we have a `/FontName' for a CID-keyed font? */
            if ( cid_font_name )
              cffface->family_name = cff_strcpy( memory, cid_font_name );
          }
  
          if ( style_name )
            cffface->style_name = style_name;
          else
            /* assume "Regular" style if we don't know better */
            cffface->style_name = cff_strcpy( memory, "Regular" );
  
          /********************************************************************
           *
           * Compute face flags.
           */
          flags = FT_FACE_FLAG_SCALABLE   | /* scalable outlines */
                  FT_FACE_FLAG_HORIZONTAL | /* horizontal data   */
                  FT_FACE_FLAG_HINTER;      /* has native hinter */
  
          if ( sfnt_format )
            flags |= FT_FACE_FLAG_SFNT;
  
          /* fixed width font? */
          if ( dict->is_fixed_pitch )
            flags |= FT_FACE_FLAG_FIXED_WIDTH;
  
    /* XXX: WE DO NOT SUPPORT KERNING METRICS IN THE GPOS TABLE FOR NOW */
  #if 0
          /* kerning available? */
          if ( face->kern_pairs )
            flags |= FT_FACE_FLAG_KERNING;
  #endif
  
          cffface->face_flags |= flags;
  
          /********************************************************************
           *
           * Compute style flags.
           */
          flags = 0;
  
          if ( dict->italic_angle )
            flags |= FT_STYLE_FLAG_ITALIC;
  
          {
            char  *weight = cff_index_get_sid_string( cff,
                                                      dict->weight );
  
  
            if ( weight )
              if ( !ft_strcmp( weight, "Bold"  ) ||
                   !ft_strcmp( weight, "Black" ) )
                flags |= FT_STYLE_FLAG_BOLD;
          }
  
          /* double check */
          if ( !(flags & FT_STYLE_FLAG_BOLD) && cffface->style_name )
            if ( !ft_strncmp( cffface->style_name, "Bold", 4 )  ||
                 !ft_strncmp( cffface->style_name, "Black", 5 ) )
              flags |= FT_STYLE_FLAG_BOLD;
  
          cffface->style_flags = flags;
        }
  
  #ifndef FT_CONFIG_OPTION_NO_GLYPH_NAMES
        /* CID-keyed CFF or CFF2 fonts don't have glyph names -- the SFNT */
        /* loader has unset this flag because of the 3.0 `post' table.    */
        if ( dict->cid_registry == 0xFFFFU && !cff2 )
          cffface->face_flags |= FT_FACE_FLAG_GLYPH_NAMES;
  #endif
  
        if ( dict->cid_registry != 0xFFFFU && pure_cff )
          cffface->face_flags |= FT_FACE_FLAG_CID_KEYED;
  
        /********************************************************************
         *
         * Compute char maps.
         */
  
        /* Try to synthesize a Unicode charmap if there is none available */
        /* already.  If an OpenType font contains a Unicode "cmap", we    */
        /* will use it, whatever be in the CFF part of the file.          */
        {
          FT_CharMapRec  cmaprec;
          FT_CharMap     cmap;
          FT_UInt        nn;
          CFF_Encoding   encoding = &cff->encoding;
  
  
          for ( nn = 0; nn < (FT_UInt)cffface->num_charmaps; nn++ )
          {
            cmap = cffface->charmaps[nn];
  
            /* Windows Unicode? */
            if ( cmap->platform_id == TT_PLATFORM_MICROSOFT &&
                 cmap->encoding_id == TT_MS_ID_UNICODE_CS   )
              goto Skip_Unicode;
  
            /* Apple Unicode platform id? */
            if ( cmap->platform_id == TT_PLATFORM_APPLE_UNICODE )
              goto Skip_Unicode; /* Apple Unicode */
          }
  
          /* since CID-keyed fonts don't contain glyph names, we can't */
          /* construct a cmap                                          */
          if ( pure_cff && cff->top_font.font_dict.cid_registry != 0xFFFFU )
            goto Exit;
  
          /* we didn't find a Unicode charmap -- synthesize one */
          cmaprec.face        = cffface;
          cmaprec.platform_id = TT_PLATFORM_MICROSOFT;
          cmaprec.encoding_id = TT_MS_ID_UNICODE_CS;
          cmaprec.encoding    = FT_ENCODING_UNICODE;
  
          nn = (FT_UInt)cffface->num_charmaps;
  
          error = FT_CMap_New( &cff_cmap_unicode_class_rec, NULL,
                               &cmaprec, NULL );
          if ( error                                      &&
               FT_ERR_NEQ( error, No_Unicode_Glyph_Name ) &&
               FT_ERR_NEQ( error, Unimplemented_Feature ) )
            goto Exit;
          error = FT_Err_Ok;
  
          /* if no Unicode charmap was previously selected, select this one */
          if ( !cffface->charmap && nn != (FT_UInt)cffface->num_charmaps )
            cffface->charmap = cffface->charmaps[nn];
  
        Skip_Unicode:
          if ( encoding->count > 0 )
          {
            FT_CMap_Class  clazz;
  
  
            cmaprec.face        = cffface;
            cmaprec.platform_id = TT_PLATFORM_ADOBE;  /* Adobe platform id */
  
            if ( encoding->offset == 0 )
            {
              cmaprec.encoding_id = TT_ADOBE_ID_STANDARD;
              cmaprec.encoding    = FT_ENCODING_ADOBE_STANDARD;
              clazz               = &cff_cmap_encoding_class_rec;
            }
            else if ( encoding->offset == 1 )
            {
              cmaprec.encoding_id = TT_ADOBE_ID_EXPERT;
              cmaprec.encoding    = FT_ENCODING_ADOBE_EXPERT;
              clazz               = &cff_cmap_encoding_class_rec;
            }
            else
            {
              cmaprec.encoding_id = TT_ADOBE_ID_CUSTOM;
              cmaprec.encoding    = FT_ENCODING_ADOBE_CUSTOM;
              clazz               = &cff_cmap_encoding_class_rec;
            }
  
            error = FT_CMap_New( clazz, NULL, &cmaprec, NULL );
          }
        }
      }
  
    Exit:
      return error;
    }
  
  
    FT_LOCAL_DEF( void )
    cff_face_done( FT_Face  cffface )         /* CFF_Face */
    {
      CFF_Face      face = (CFF_Face)cffface;
      FT_Memory     memory;
      SFNT_Service  sfnt;
  
  
      if ( !face )
        return;
  
      memory = cffface->memory;
      sfnt   = (SFNT_Service)face->sfnt;
  
      if ( sfnt )
        sfnt->done_face( face );
  
      {
        CFF_Font  cff = (CFF_Font)face->extra.data;
  
  
        if ( cff )
        {
          cff_font_done( cff );
          FT_FREE( face->extra.data );
        }
      }
  
  #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
      cff_done_blend( face );
      face->blend = NULL;
  #endif
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    cff_driver_init( FT_Module  module )        /* CFF_Driver */
    {
      PS_Driver  driver = (PS_Driver)module;
  
      FT_UInt32  seed;
  
  
      /* set default property values, cf. `ftcffdrv.h' */
  #ifdef CFF_CONFIG_OPTION_OLD_ENGINE
      driver->hinting_engine = FT_HINTING_FREETYPE;
  #else
      driver->hinting_engine = FT_HINTING_ADOBE;
  #endif
  
      driver->no_stem_darkening = TRUE;
  
      driver->darken_params[0] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X1;
      driver->darken_params[1] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_Y1;
      driver->darken_params[2] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X2;
      driver->darken_params[3] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_Y2;
      driver->darken_params[4] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X3;
      driver->darken_params[5] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_Y3;
      driver->darken_params[6] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X4;
      driver->darken_params[7] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_Y4;
  
      /* compute random seed from some memory addresses */
      seed = (FT_UInt32)( (FT_Offset)(char*)&seed          ^
                          (FT_Offset)(char*)&module        ^
                          (FT_Offset)(char*)module->memory );
      seed = seed ^ ( seed >> 10 ) ^ ( seed >> 20 );
  
      driver->random_seed = (FT_Int32)seed;
      if ( driver->random_seed < 0 )
        driver->random_seed = -driver->random_seed;
      else if ( driver->random_seed == 0 )
        driver->random_seed = 123456789;
  
      return FT_Err_Ok;
    }
  
  
    FT_LOCAL_DEF( void )
    cff_driver_done( FT_Module  module )        /* CFF_Driver */
    {
      FT_UNUSED( module );
    }
  
  
  /* END */
  

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