cffobjs.c

source code: Covert TXT to PDF

/***************************************************************************/
/*                                                                         */
/*  cffobjs.c                                                              */
/*                                                                         */
/*    OpenType objects manager (body).                                     */
/*                                                                         */
/*  Copyright 1996-2001 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_ERRORS_H
#include FT_TRUETYPE_IDS_H
#include FT_TRUETYPE_TAGS_H
#include FT_INTERNAL_SFNT_H
#include FT_INTERNAL_POSTSCRIPT_NAMES_H
#include FT_INTERNAL_POSTSCRIPT_HINTS_H
#include "cffobjs.h"
#include "cffload.h"

#include "cfferrs.h"

#include <string.h>         /* for strlen() */


  /*************************************************************************/
  /*                                                                       */
  /* 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_cffobjs




  /*************************************************************************/
  /*                                                                       */
  /*                            SIZE FUNCTIONS                             */
  /*                                                                       */
  /*  Note that we store the global hints in the size's "internal" root    */
  /*  field.                                                               */
  /*                                                                       */
  /*************************************************************************/


  static PSH_Globals_Funcs
  CFF_Size_Get_Globals_Funcs( CFF_Size  size )
  {
    CFF_Face             face     = (CFF_Face)size->face;
    CFF_Font*            font     = (CFF_Font *)face->extra.data;
    PSHinter_Interface*  pshinter = (PSHinter_Interface *)font->pshinter;
    FT_Module            module;


    module = FT_Get_Module( size->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( CFF_Size  size )
  {
    if ( size->internal )
    {
      PSH_Globals_Funcs  funcs;


      funcs = CFF_Size_Get_Globals_Funcs( size );
      if ( funcs )
        funcs->destroy( (PSH_Globals)size->internal );

      size->internal = 0;
    }
  }


  FT_LOCAL_DEF FT_Error
  CFF_Size_Init( CFF_Size  size )
  {
    FT_Error           error = 0;
    PSH_Globals_Funcs  funcs = CFF_Size_Get_Globals_Funcs( size );


    if ( funcs )
    {
      PSH_Globals   globals;
      CFF_Face      face    = (CFF_Face)size->face;
      CFF_Font*     font    = (CFF_Font *)face->extra.data;
      CFF_SubFont*  subfont = &font->top_font;

      CFF_Private*  cpriv   = &subfont->private_dict;
      T1_Private    priv;


      /* IMPORTANT: The CFF and Type1 private dictionaries have    */
      /*            slightly different structures; we need to      */
      /*            synthetize a type1 dictionary on the fly here. */

      {
        FT_UInt  n, count;


        MEM_Set( &priv, 0, sizeof ( 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 = cpriv->blue_shift;
        priv.blue_fuzz  = 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;
      }

      error = funcs->create( size->face->memory, &priv, &globals );
      if ( !error )
        size->internal = (FT_Size_Internal)(void*)globals;
    }

    return error;
  }


  FT_LOCAL_DEF FT_Error
  CFF_Size_Reset( CFF_Size  size )
  {
    PSH_Globals_Funcs  funcs = CFF_Size_Get_Globals_Funcs( size );
    FT_Error           error = 0;


    if ( funcs )
      error = funcs->set_scale( (PSH_Globals)size->internal,
                                 size->metrics.x_scale,
                                 size->metrics.y_scale,
                                 0, 0 );
    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /*                            SLOT  FUNCTIONS                            */
  /*                                                                       */
  /*************************************************************************/

  FT_LOCAL_DEF void
  CFF_GlyphSlot_Done( CFF_GlyphSlot  slot )
  {
    slot->root.internal->glyph_hints = 0;
  }


  FT_LOCAL_DEF FT_Error
  CFF_GlyphSlot_Init( CFF_GlyphSlot  slot )
  {
    CFF_Face             face     = (CFF_Face)slot->root.face;
    CFF_Font*            font     = (CFF_Font *)face->extra.data;
    PSHinter_Interface*  pshinter = (PSHinter_Interface *)font->pshinter;


    if ( pshinter )
    {
      FT_Module  module;


      module = FT_Get_Module( slot->root.face->driver->root.library,
                              "pshinter" );
      if ( module )
      {
        T2_Hints_Funcs  funcs;


        funcs = pshinter->get_t2_funcs( module );
        slot->root.internal->glyph_hints = (void*)funcs;
      }
    }

    return 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /*                           FACE  FUNCTIONS                             */
  /*                                                                       */
  /*************************************************************************/

  static FT_String*
  CFF_StrCopy( FT_Memory         memory,
               const FT_String*  source )
  {
    FT_Error    error;
    FT_String*  result = 0;
    FT_Int      len = (FT_Int)strlen( source );


    if ( !ALLOC( result, len + 1 ) )
    {
      MEM_Copy( result, source, len );
      result[len] = 0;
    }
    return result;
  }


#if 0

  /* this function is used to build a Unicode charmap from the glyph names */
  /* in a file                                                             */
  static FT_Error
  CFF_Build_Unicode_Charmap( CFF_Face            face,
                             FT_ULong            base_offset,
                             PSNames_Interface*  psnames )
  {
    CFF_Font*       font = (CFF_Font*)face->extra.data;
    FT_Memory       memory = FT_FACE_MEMORY(face);
    FT_UInt         n, num_glyphs = face->root.num_glyphs;
    const char**    glyph_names;
    FT_Error        error;
    CFF_Font_Dict*  dict = &font->top_font.font_dict;
    FT_ULong        charset_offset;
    FT_Byte         format;
    FT_Stream       stream = face->root.stream;


    charset_offset = dict->charset_offset;
    if ( !charset_offset )
    {
      FT_ERROR(( "CFF_Build_Unicode_Charmap: charset table is missing\n" ));
      error = CFF_Err_Invalid_File_Format;
      goto Exit;
    }

    /* allocate the charmap */
    if ( ALLOC( face->charmap, ...

    /* seek to charset table and allocate glyph names table */
    if ( FILE_Seek( base_offset + charset_offset )           ||
         ALLOC_ARRAY( glyph_names, num_glyphs, const char* ) )
      goto Exit;

    /* now, read each glyph name and store it in the glyph name table */
    if ( READ_Byte( format ) )
      goto Fail;

    switch ( format )
    {
    case 0:  /* format 0 - one SID per glyph */
      {
        const char**  gname = glyph_names;
        const char**  limit = gname + num_glyphs;


        if ( ACCESS_Frame( num_glyphs * 2 ) )
          goto Fail;

        for ( ; gname < limit; gname++ )
          gname[0] = CFF_Get_String( &font->string_index,
                                     GET_UShort(),
                                     psnames );
        FORGET_Frame();
        break;
      }

    case 1:  /* format 1 - sequential ranges                    */
    case 2:  /* format 2 - sequential ranges with 16-bit counts */
      {
        const char**  gname = glyph_names;
        const char**  limit = gname + num_glyphs;
        FT_UInt       len = 3;


        if ( format == 2 )
          len++;

        while ( gname < limit )
        {
          FT_UInt  first;
          FT_UInt  count;


          if ( ACCESS_Frame( len ) )
            goto Fail;

          first = GET_UShort();
          if ( format == 3 )
            count = GET_UShort();
          else
            count = GET_Byte();

          FORGET_Frame();

          for ( ; count > 0; count-- )
          {
            gname[0] = CFF_Get_String( &font->string_index,
                                       first,
                                       psnames );
            gname++;
            first++;
          }
        }
        break;
      }

    default:   /* unknown charset format! */
      FT_ERROR(( "CFF_Build_Unicode_Charmap: unknown charset format!\n" ));
      error = CFF_Err_Invalid_File_Format;
      goto Fail;
    }

    /* all right, the glyph names were loaded; we now need to create */
    /* the corresponding unicode charmap                             */

  Fail:
    for ( n = 0; n < num_glyphs; n++ )
      FREE( glyph_names[n] );

    FREE( glyph_names );

  Exit:
    return error;
  }

#endif /* 0 */


  static FT_Encoding
  find_encoding( int  platform_id,
                 int  encoding_id )
  {
    typedef struct  TEncoding
    {
      int          platform_id;
      int          encoding_id;
      FT_Encoding  encoding;

    } TEncoding;

    static
    const TEncoding  tt_encodings[] =
    {
      { TT_PLATFORM_ISO,           -1,                  ft_encoding_unicode },

      { TT_PLATFORM_APPLE_UNICODE, -1,                  ft_encoding_unicode },

      { TT_PLATFORM_MACINTOSH,     TT_MAC_ID_ROMAN,     ft_encoding_apple_roman },

      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_UNICODE_CS, ft_encoding_unicode },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_SJIS,       ft_encoding_sjis },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_GB2312,     ft_encoding_gb2312 },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_BIG_5,      ft_encoding_big5 },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_WANSUNG,    ft_encoding_wansung },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_JOHAB,      ft_encoding_johab }