kc3-lang/freetype/src/psaux/psft.c

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• Hash : 0bcb664d
  Author :
  Date : 2022-12-20T16:38:39
  

  [psaux] Delay the upem validity assertion. Fixes #1194. * src/psaux/psft.c (cf2_getUnitsPerEm): Remove the upem assert. (cf2_checkTransform): Assert the upem validity after checking the scale.

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• src/psaux/psft.c

• /****************************************************************************
   *
   * psft.c
   *
   *   FreeType Glue Component to Adobe's Interpreter (body).
   *
   * Copyright 2013-2014 Adobe Systems Incorporated.
   *
   * This software, and all works of authorship, whether in source or
   * object code form as indicated by the copyright notice(s) included
   * herein (collectively, the "Work") is made available, and may only be
   * used, modified, and distributed under the FreeType Project License,
   * LICENSE.TXT.  Additionally, subject to the terms and conditions of the
   * FreeType Project License, each contributor to the Work hereby grants
   * to any individual or legal entity exercising permissions granted by
   * the FreeType Project License and this section (hereafter, "You" or
   * "Your") a perpetual, worldwide, non-exclusive, no-charge,
   * royalty-free, irrevocable (except as stated in this section) patent
   * license to make, have made, use, offer to sell, sell, import, and
   * otherwise transfer the Work, where such license applies only to those
   * patent claims licensable by such contributor that are necessarily
   * infringed by their contribution(s) alone or by combination of their
   * contribution(s) with the Work to which such contribution(s) was
   * submitted.  If You institute patent litigation against any entity
   * (including a cross-claim or counterclaim in a lawsuit) alleging that
   * the Work or a contribution incorporated within the Work constitutes
   * direct or contributory patent infringement, then any patent licenses
   * granted to You under this License for that Work shall terminate as of
   * the date such litigation is filed.
   *
   * By using, modifying, or distributing the Work you indicate that you
   * have read and understood the terms and conditions of the
   * FreeType Project License as well as those provided in this section,
   * and you accept them fully.
   *
   */
  
  
  #include "psft.h"
  #include <freetype/internal/ftdebug.h>
  
  #include "psfont.h"
  #include "pserror.h"
  #include "psobjs.h"
  #include "cffdecode.h"
  
  #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
  #include <freetype/ftmm.h>
  #include <freetype/internal/services/svmm.h>
  #endif
  
  #include <freetype/internal/services/svcfftl.h>
  
  
  #define CF2_MAX_SIZE  cf2_intToFixed( 2000 )    /* max ppem */
  
  
    /*
     * This check should avoid most internal overflow cases.  Clients should
     * generally respond to `Glyph_Too_Big' by getting a glyph outline
     * at EM size, scaling it and filling it as a graphics operation.
     *
     */
    static FT_Error
    cf2_checkTransform( const CF2_Matrix*  transform,
                        CF2_Int            unitsPerEm )
    {
      CF2_Fixed  maxScale;
  
  
      if ( transform->a <= 0 || transform->d <= 0 )
        return FT_THROW( Invalid_Size_Handle );
  
      FT_ASSERT( unitsPerEm > 0 );
      FT_ASSERT( transform->b == 0 && transform->c == 0 );
      FT_ASSERT( transform->tx == 0 && transform->ty == 0 );
  
      if ( unitsPerEm > 0x7FFF )
        return FT_THROW( Glyph_Too_Big );
  
      maxScale = FT_DivFix( CF2_MAX_SIZE, cf2_intToFixed( unitsPerEm ) );
  
      if ( transform->a > maxScale || transform->d > maxScale )
        return FT_THROW( Glyph_Too_Big );
  
      return FT_Err_Ok;
    }
  
  
    static void
    cf2_setGlyphWidth( CF2_Outline  outline,
                       CF2_Fixed    width )
    {
      PS_Decoder*  decoder = outline->decoder;
  
  
      FT_ASSERT( decoder );
  
      if ( !decoder->builder.is_t1 )
        *decoder->glyph_width = cf2_fixedToInt( width );
    }
  
  
    /* Clean up font instance. */
    static void
    cf2_free_instance( void*  ptr )
    {
      CF2_Font  font = (CF2_Font)ptr;
  
  
      if ( font )
      {
        FT_Memory  memory = font->memory;
  
  
        FT_FREE( font->blend.lastNDV );
        FT_FREE( font->blend.BV );
      }
    }
  
  
    /*********************************************
     *
     * functions for handling client outline;
     * FreeType uses coordinates in 26.6 format
     *
     */
  
    static void
    cf2_builder_moveTo( CF2_OutlineCallbacks      callbacks,
                        const CF2_CallbackParams  params )
    {
      /* downcast the object pointer */
      CF2_Outline  outline = (CF2_Outline)callbacks;
      PS_Builder*  builder;
  
      (void)params;        /* only used in debug mode */
  
  
      FT_ASSERT( outline && outline->decoder );
      FT_ASSERT( params->op == CF2_PathOpMoveTo );
  
      builder = &outline->decoder->builder;
  
      /* note: two successive moves simply close the contour twice */
      ps_builder_close_contour( builder );
      builder->path_begun = 0;
    }
  
  
    static void
    cf2_builder_lineTo( CF2_OutlineCallbacks      callbacks,
                        const CF2_CallbackParams  params )
    {
      FT_Error  error;
  
      /* downcast the object pointer */
      CF2_Outline  outline = (CF2_Outline)callbacks;
      PS_Builder*  builder;
  
  
      FT_ASSERT( outline && outline->decoder );
      FT_ASSERT( params->op == CF2_PathOpLineTo );
  
      builder = &outline->decoder->builder;
  
      if ( !builder->path_begun )
      {
        /* record the move before the line; also check points and set */
        /* `path_begun'                                               */
        error = ps_builder_start_point( builder,
                                        params->pt0.x,
                                        params->pt0.y );
        if ( error )
        {
          if ( !*callbacks->error )
            *callbacks->error =  error;
          return;
        }
      }
  
      /* `ps_builder_add_point1' includes a check_points call for one point */
      error = ps_builder_add_point1( builder,
                                     params->pt1.x,
                                     params->pt1.y );
      if ( error )
      {
        if ( !*callbacks->error )
          *callbacks->error =  error;
        return;
      }
    }
  
  
    static void
    cf2_builder_cubeTo( CF2_OutlineCallbacks      callbacks,
                        const CF2_CallbackParams  params )
    {
      FT_Error  error;
  
      /* downcast the object pointer */
      CF2_Outline  outline = (CF2_Outline)callbacks;
      PS_Builder*  builder;
  
  
      FT_ASSERT( outline && outline->decoder );
      FT_ASSERT( params->op == CF2_PathOpCubeTo );
  
      builder = &outline->decoder->builder;
  
      if ( !builder->path_begun )
      {
        /* record the move before the line; also check points and set */
        /* `path_begun'                                               */
        error = ps_builder_start_point( builder,
                                        params->pt0.x,
                                        params->pt0.y );
        if ( error )
        {
          if ( !*callbacks->error )
            *callbacks->error =  error;
          return;
        }
      }
  
      /* prepare room for 3 points: 2 off-curve, 1 on-curve */
      error = ps_builder_check_points( builder, 3 );
      if ( error )
      {
        if ( !*callbacks->error )
          *callbacks->error =  error;
        return;
      }
  
      ps_builder_add_point( builder,
                            params->pt1.x,
                            params->pt1.y, 0 );
      ps_builder_add_point( builder,
                            params->pt2.x,
                            params->pt2.y, 0 );
      ps_builder_add_point( builder,
                            params->pt3.x,
                            params->pt3.y, 1 );
    }
  
  
    static void
    cf2_outline_init( CF2_Outline  outline,
                      FT_Memory    memory,
                      FT_Error*    error )
    {
      FT_ZERO( outline );
  
      outline->root.memory = memory;
      outline->root.error  = error;
  
      outline->root.moveTo = cf2_builder_moveTo;
      outline->root.lineTo = cf2_builder_lineTo;
      outline->root.cubeTo = cf2_builder_cubeTo;
    }
  
  
    /* get scaling and hint flag from GlyphSlot */
    static void
    cf2_getScaleAndHintFlag( PS_Decoder*  decoder,
                             CF2_Fixed*   x_scale,
                             CF2_Fixed*   y_scale,
                             FT_Bool*     hinted,
                             FT_Bool*     scaled )
    {
      FT_ASSERT( decoder && decoder->builder.glyph );
  
      /* note: FreeType scale includes a factor of 64 */
      *hinted = decoder->builder.glyph->hint;
      *scaled = decoder->builder.glyph->scaled;
  
      if ( *hinted )
      {
        *x_scale = ADD_INT32( decoder->builder.glyph->x_scale, 32 ) / 64;
        *y_scale = ADD_INT32( decoder->builder.glyph->y_scale, 32 ) / 64;
      }
      else
      {
        /* for unhinted outlines, `cff_slot_load' does the scaling, */
        /* thus render at `unity' scale                             */
  
        *x_scale = 0x0400;   /* 1/64 as 16.16 */
        *y_scale = 0x0400;
      }
    }
  
  
    /* get units per em from `FT_Face' */
    /* TODO: should handle font matrix concatenation? */
    static FT_UShort
    cf2_getUnitsPerEm( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->builder.face );
  
      return decoder->builder.face->units_per_EM;
    }
  
  
    /* Main entry point: Render one glyph. */
    FT_LOCAL_DEF( FT_Error )
    cf2_decoder_parse_charstrings( PS_Decoder*  decoder,
                                   FT_Byte*     charstring_base,
                                   FT_ULong     charstring_len )
    {
      FT_Memory  memory;
      FT_Error   error = FT_Err_Ok;
      CF2_Font   font;
  
      FT_Bool  is_t1 = decoder->builder.is_t1;
  
  
      FT_ASSERT( decoder &&
                 ( is_t1 || decoder->cff ) );
  
      if ( is_t1 && !decoder->current_subfont )
      {
        FT_ERROR(( "cf2_decoder_parse_charstrings (Type 1): "
                   "SubFont missing. Use `t1_make_subfont' first\n" ));
        return FT_THROW( Invalid_Table );
      }
  
      memory = decoder->builder.memory;
  
      /* CF2 data is saved here across glyphs */
      font = (CF2_Font)decoder->cf2_instance->data;
  
      /* on first glyph, allocate instance structure */
      if ( !decoder->cf2_instance->data )
      {
        decoder->cf2_instance->finalizer =
          (FT_Generic_Finalizer)cf2_free_instance;
  
        if ( FT_ALLOC( decoder->cf2_instance->data,
                       sizeof ( CF2_FontRec ) ) )
          return FT_THROW( Out_Of_Memory );
  
        font = (CF2_Font)decoder->cf2_instance->data;
  
        font->memory = memory;
  
        if ( !is_t1 )
          font->cffload = (FT_Service_CFFLoad)decoder->cff->cffload;
  
        /* initialize a client outline, to be shared by each glyph rendered */
        cf2_outline_init( &font->outline, font->memory, &font->error );
      }
  
      /* save decoder; it is a stack variable and will be different on each */
      /* call                                                               */
      font->decoder         = decoder;
      font->outline.decoder = decoder;
  
      {
        /* build parameters for Adobe engine */
  
        PS_Builder*  builder = &decoder->builder;
        PS_Driver    driver  = (PS_Driver)FT_FACE_DRIVER( builder->face );
  
        FT_Bool  no_stem_darkening_driver =
                   driver->no_stem_darkening;
        FT_Char  no_stem_darkening_font =
                   builder->face->internal->no_stem_darkening;
  
        /* local error */
        FT_Error       error2 = FT_Err_Ok;
        CF2_BufferRec  buf;
        CF2_Matrix     transform;
        CF2_F16Dot16   glyphWidth;
  
        FT_Bool  hinted;
        FT_Bool  scaled;
  
  
        /* FreeType has already looked up the GID; convert to         */
        /* `RegionBuffer', assuming that the input has been validated */
        FT_ASSERT( charstring_base + charstring_len >= charstring_base );
  
        FT_ZERO( &buf );
        buf.start =
        buf.ptr   = charstring_base;
        buf.end   = FT_OFFSET( charstring_base, charstring_len );
  
        FT_ZERO( &transform );
  
        cf2_getScaleAndHintFlag( decoder,
                                 &transform.a,
                                 &transform.d,
                                 &hinted,
                                 &scaled );
  
        if ( is_t1 )
          font->isCFF2 = FALSE;
        else
        {
          /* copy isCFF2 boolean from TT_Face to CF2_Font */
          font->isCFF2 = ((TT_Face)builder->face)->is_cff2;
        }
        font->isT1 = is_t1;
  
        font->renderingFlags = 0;
        if ( hinted )
          font->renderingFlags |= CF2_FlagsHinted;
        if ( scaled && ( !no_stem_darkening_font        ||
                         ( no_stem_darkening_font < 0 &&
                           !no_stem_darkening_driver  ) ) )
          font->renderingFlags |= CF2_FlagsDarkened;
  
        font->darkenParams[0] = driver->darken_params[0];
        font->darkenParams[1] = driver->darken_params[1];
        font->darkenParams[2] = driver->darken_params[2];
        font->darkenParams[3] = driver->darken_params[3];
        font->darkenParams[4] = driver->darken_params[4];
        font->darkenParams[5] = driver->darken_params[5];
        font->darkenParams[6] = driver->darken_params[6];
        font->darkenParams[7] = driver->darken_params[7];
  
        /* now get an outline for this glyph;      */
        /* also get units per em to validate scale */
        font->unitsPerEm = (CF2_Int)cf2_getUnitsPerEm( decoder );
  
        if ( scaled )
        {
          error2 = cf2_checkTransform( &transform, font->unitsPerEm );
          if ( error2 )
            return error2;
        }
  
        error2 = cf2_getGlyphOutline( font, &buf, &transform, &glyphWidth );
        if ( error2 )
          return FT_ERR( Invalid_File_Format );
  
        cf2_setGlyphWidth( &font->outline, glyphWidth );
  
        return FT_Err_Ok;
      }
    }
  
  
    /* get pointer to current FreeType subfont (based on current glyphID) */
    FT_LOCAL_DEF( CFF_SubFont )
    cf2_getSubfont( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      return decoder->current_subfont;
    }
  
  
    /* get pointer to VStore structure */
    FT_LOCAL_DEF( CFF_VStore )
    cf2_getVStore( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->cff );
  
      return &decoder->cff->vstore;
    }
  
  
    /* get maxstack value from CFF2 Top DICT */
    FT_LOCAL_DEF( FT_UInt )
    cf2_getMaxstack( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->cff );
  
      return decoder->cff->top_font.font_dict.maxstack;
    }
  
  
  #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
    /* Get normalized design vector for current render request; */
    /* return pointer and length.                               */
    /*                                                          */
    /* Note: Uses FT_Fixed not CF2_Fixed for the vector.        */
    FT_LOCAL_DEF( FT_Error )
    cf2_getNormalizedVector( PS_Decoder*  decoder,
                             CF2_UInt     *len,
                             FT_Fixed*    *vec )
    {
      TT_Face                  face;
      FT_Service_MultiMasters  mm;
  
  
      FT_ASSERT( decoder && decoder->builder.face );
      FT_ASSERT( vec && len );
      FT_ASSERT( !decoder->builder.is_t1 );
  
      face = (TT_Face)decoder->builder.face;
      mm   = (FT_Service_MultiMasters)face->mm;
  
      return mm->get_var_blend( FT_FACE( face ), len, NULL, vec, NULL );
    }
  #endif
  
  
    /* get `y_ppem' from `CFF_Size' */
    FT_LOCAL_DEF( CF2_Fixed )
    cf2_getPpemY( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder                     &&
                 decoder->builder.face       &&
                 decoder->builder.face->size );
  
      /*
       * Note that `y_ppem' can be zero if there wasn't a call to
       * `FT_Set_Char_Size' or something similar.  However, this isn't a
       * problem since we come to this place in the code only if
       * FT_LOAD_NO_SCALE is set (the other case gets caught by
       * `cf2_checkTransform').  The ppem value is needed to compute the stem
       * darkening, which is disabled for getting the unscaled outline.
       *
       */
      return cf2_intToFixed(
               decoder->builder.face->size->metrics.y_ppem );
    }
  
  
    /* get standard stem widths for the current subfont; */
    /* FreeType stores these as integer font units       */
    /* (note: variable names seem swapped)               */
    FT_LOCAL_DEF( CF2_Fixed )
    cf2_getStdVW( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      return cf2_intToFixed(
               decoder->current_subfont->private_dict.standard_height );
    }
  
  
    FT_LOCAL_DEF( CF2_Fixed )
    cf2_getStdHW( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      return cf2_intToFixed(
               decoder->current_subfont->private_dict.standard_width );
    }
  
  
    /* note: FreeType stores 1000 times the actual value for `BlueScale' */
    FT_LOCAL_DEF( void )
    cf2_getBlueMetrics( PS_Decoder*  decoder,
                        CF2_Fixed*   blueScale,
                        CF2_Fixed*   blueShift,
                        CF2_Fixed*   blueFuzz )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      *blueScale = FT_DivFix(
                     decoder->current_subfont->private_dict.blue_scale,
                     cf2_intToFixed( 1000 ) );
      *blueShift = cf2_intToFixed(
                     decoder->current_subfont->private_dict.blue_shift );
      *blueFuzz  = cf2_intToFixed(
                     decoder->current_subfont->private_dict.blue_fuzz );
    }
  
  
    /* get blue values counts and arrays; the FreeType parser has validated */
    /* the counts and verified that each is an even number                  */
    FT_LOCAL_DEF( void )
    cf2_getBlueValues( PS_Decoder*  decoder,
                       size_t*      count,
                       FT_Pos*     *data )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      *count = decoder->current_subfont->private_dict.num_blue_values;
      *data  = (FT_Pos*)
                 &decoder->current_subfont->private_dict.blue_values;
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_getOtherBlues( PS_Decoder*  decoder,
                       size_t*      count,
                       FT_Pos*     *data )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      *count = decoder->current_subfont->private_dict.num_other_blues;
      *data  = (FT_Pos*)
                 &decoder->current_subfont->private_dict.other_blues;
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_getFamilyBlues( PS_Decoder*  decoder,
                        size_t*      count,
                        FT_Pos*     *data )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      *count = decoder->current_subfont->private_dict.num_family_blues;
      *data  = (FT_Pos*)
                 &decoder->current_subfont->private_dict.family_blues;
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_getFamilyOtherBlues( PS_Decoder*  decoder,
                             size_t*      count,
                             FT_Pos*     *data )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      *count = decoder->current_subfont->private_dict.num_family_other_blues;
      *data  = (FT_Pos*)
                 &decoder->current_subfont->private_dict.family_other_blues;
    }
  
  
    FT_LOCAL_DEF( CF2_Int )
    cf2_getLanguageGroup( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      return decoder->current_subfont->private_dict.language_group;
    }
  
  
    /* convert unbiased subroutine index to `CF2_Buffer' and */
    /* return 0 on success                                   */
    FT_LOCAL_DEF( CF2_Int )
    cf2_initGlobalRegionBuffer( PS_Decoder*  decoder,
                                CF2_Int      subrNum,
                                CF2_Buffer   buf )
    {
      CF2_UInt  idx;
  
  
      FT_ASSERT( decoder );
  
      FT_ZERO( buf );
  
      idx = (CF2_UInt)( subrNum + decoder->globals_bias );
      if ( idx >= decoder->num_globals )
        return TRUE;     /* error */
  
      FT_ASSERT( decoder->globals );
  
      buf->start =
      buf->ptr   = decoder->globals[idx];
      buf->end   = decoder->globals[idx + 1];
  
      return FALSE;      /* success */
    }
  
  
    /* convert AdobeStandardEncoding code to CF2_Buffer; */
    /* used for seac component                           */
    FT_LOCAL_DEF( FT_Error )
    cf2_getSeacComponent( PS_Decoder*  decoder,
                          CF2_Int      code,
                          CF2_Buffer   buf )
    {
      CF2_Int   gid;
      FT_Byte*  charstring;
      FT_ULong  len;
      FT_Error  error;
  
  
      FT_ASSERT( decoder );
      FT_ASSERT( !decoder->builder.is_t1 );
  
      FT_ZERO( buf );
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
      /* Incremental fonts don't necessarily have valid charsets.        */
      /* They use the character code, not the glyph index, in this case. */
      if ( decoder->builder.face->internal->incremental_interface )
        gid = code;
      else
  #endif /* FT_CONFIG_OPTION_INCREMENTAL */
      {
        gid = cff_lookup_glyph_by_stdcharcode( decoder->cff, code );
        if ( gid < 0 )
          return FT_THROW( Invalid_Glyph_Format );
      }
  
      error = decoder->get_glyph_callback( (TT_Face)decoder->builder.face,
                                           (CF2_UInt)gid,
                                           &charstring,
                                           &len );
      /* TODO: for now, just pass the FreeType error through */
      if ( error )
        return error;
  
      /* assume input has been validated */
      FT_ASSERT( charstring + len >= charstring );
  
      buf->start = charstring;
      buf->end   = FT_OFFSET( charstring, len );
      buf->ptr   = buf->start;
  
      return FT_Err_Ok;
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_freeSeacComponent( PS_Decoder*  decoder,
                           CF2_Buffer   buf )
    {
      FT_ASSERT( decoder );
      FT_ASSERT( !decoder->builder.is_t1 );
  
      decoder->free_glyph_callback( (TT_Face)decoder->builder.face,
                                    (FT_Byte**)&buf->start,
                                    (FT_ULong)( buf->end - buf->start ) );
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    cf2_getT1SeacComponent( PS_Decoder*  decoder,
                            FT_UInt      glyph_index,
                            CF2_Buffer   buf )
    {
      FT_Data   glyph_data;
      FT_Error  error = FT_Err_Ok;
      T1_Face   face  = (T1_Face)decoder->builder.face;
      T1_Font   type1 = &face->type1;
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
      FT_Incremental_InterfaceRec  *inc =
        face->root.internal->incremental_interface;
  
  
      /* For incremental fonts get the character data using the */
      /* callback function.                                     */
      if ( inc )
        error = inc->funcs->get_glyph_data( inc->object,
                                            glyph_index, &glyph_data );
      else
  #endif
      /* For ordinary fonts get the character data stored in the face record. */
      {
        glyph_data.pointer = type1->charstrings[glyph_index];
        glyph_data.length  = type1->charstrings_len[glyph_index];
      }
  
      if ( !error )
      {
        FT_Byte*  charstring_base = (FT_Byte*)glyph_data.pointer;
        FT_ULong  charstring_len  = glyph_data.length;
  
  
        FT_ASSERT( charstring_base + charstring_len >= charstring_base );
  
        FT_ZERO( buf );
        buf->start =
        buf->ptr   = charstring_base;
        buf->end   = charstring_base + charstring_len;
      }
  
      return error;
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_freeT1SeacComponent( PS_Decoder*  decoder,
                             CF2_Buffer   buf )
    {
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
  
      T1_Face  face;
      FT_Data  data;
  
  
      FT_ASSERT( decoder );
  
      face = (T1_Face)decoder->builder.face;
  
      data.pointer = buf->start;
      data.length  = (FT_UInt)( buf->end - buf->start );
  
      if ( face->root.internal->incremental_interface )
        face->root.internal->incremental_interface->funcs->free_glyph_data(
          face->root.internal->incremental_interface->object,
          &data );
  
  #else /* !FT_CONFIG_OPTION_INCREMENTAL */
  
      FT_UNUSED( decoder );
      FT_UNUSED( buf );
  
  #endif /* !FT_CONFIG_OPTION_INCREMENTAL */
    }
  
  
    FT_LOCAL_DEF( CF2_Int )
    cf2_initLocalRegionBuffer( PS_Decoder*  decoder,
                               CF2_Int      subrNum,
                               CF2_Buffer   buf )
    {
      CF2_UInt  idx;
  
  
      FT_ASSERT( decoder );
  
      FT_ZERO( buf );
  
      idx = (CF2_UInt)( subrNum + decoder->locals_bias );
      if ( idx >= decoder->num_locals )
        return TRUE;     /* error */
  
      FT_ASSERT( decoder->locals );
  
      buf->start = decoder->locals[idx];
  
      if ( decoder->builder.is_t1 )
      {
        /* The Type 1 driver stores subroutines without the seed bytes. */
        /* The CID driver stores subroutines with seed bytes.  This     */
        /* case is taken care of when decoder->subrs_len == 0.          */
        if ( decoder->locals_len )
          buf->end = FT_OFFSET( buf->start, decoder->locals_len[idx] );
        else
        {
          /* We are using subroutines from a CID font.  We must adjust */
          /* for the seed bytes.                                       */
          buf->start += ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
          buf->end    = decoder->locals[idx + 1];
        }
  
        if ( !buf->start )
        {
          FT_ERROR(( "cf2_initLocalRegionBuffer (Type 1 mode):"
                     " invoking empty subrs\n" ));
        }
      }
      else
      {
        buf->end = decoder->locals[idx + 1];
      }
  
      buf->ptr = buf->start;
  
      return FALSE;      /* success */
    }
  
  
    FT_LOCAL_DEF( CF2_Fixed )
    cf2_getDefaultWidthX( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      return cf2_intToFixed(
               decoder->current_subfont->private_dict.default_width );
    }
  
  
    FT_LOCAL_DEF( CF2_Fixed )
    cf2_getNominalWidthX( PS_Decoder*  decoder )
    {
      FT_ASSERT( decoder && decoder->current_subfont );
  
      return cf2_intToFixed(
               decoder->current_subfont->private_dict.nominal_width );
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_outline_reset( CF2_Outline  outline )
    {
      PS_Decoder*  decoder = outline->decoder;
  
  
      FT_ASSERT( decoder );
  
      outline->root.windingMomentum = 0;
  
      FT_GlyphLoader_Rewind( decoder->builder.loader );
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_outline_close( CF2_Outline  outline )
    {
      PS_Decoder*  decoder = outline->decoder;
  
  
      FT_ASSERT( decoder );
  
      ps_builder_close_contour( &decoder->builder );
  
      FT_GlyphLoader_Add( decoder->builder.loader );
    }
  
  
  /* END */
  

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