t2objs.c

qt-embedded-2.3.8.tar.gz源码

/***************************************************************************/
/*                                                                         */
/*  t2objs.c                                                               */
/*                                                                         */
/*    OpenType objects manager (body).                                     */
/*                                                                         */
/*  Copyright 1996-2000 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/internal/psnames.h>


#ifdef FT_FLAT_COMPILE

#include "t2objs.h"
#include "t2load.h"

#else

#include <cff/t2objs.h>
#include <cff/t2load.h>

#endif


#include <freetype/internal/t2errors.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_t2objs


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

  static
  FT_String*  T2_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( T2_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 = T2_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] = T2_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] = T2_Get_String( &font->string_index,
                                        first,
                                        psnames );
              gname++;
              first++;
            }
          }
          break;
        }

      default:   /* unknown charset format! */
        FT_ERROR(( "CFF: unknown charset format!\n" ));
        error = T2_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 }
    };

    const TEncoding  *cur, *limit;


    cur   = tt_encodings;
    limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] );

    for ( ; cur < limit; cur++ )
    {
      if ( cur->platform_id == platform_id )
      {
        if ( cur->encoding_id == encoding_id ||
             cur->encoding_id == -1          )
          return cur->encoding;
      }
    }

    return ft_encoding_none;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    T2_Init_Face                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a given OpenType face object.                          */
  /*                                                                       */
  /* <Input>                                                               */
  /*    stream     :: The source font stream.                              */
  /*                                                                       */
  /*    face_index :: The index of the font face in the resource.          */
  /*                                                                       */
  /*    num_params :: Number of additional generic parameters.  Ignored.   */
  /*                                                                       */
  /*    params     :: Additional generic parameters.  Ignored.             */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    face       :: The newly built face object.                         */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL
  FT_Error  T2_Init_Face( FT_Stream      stream,
                          T2_Face        face,
                          FT_Int         face_index,
                          FT_Int         num_params,
                          FT_Parameter*  params )
  {
    FT_Error            error;
    SFNT_Interface*     sfnt;
    PSNames_Interface*  psnames;
    FT_Bool             pure_cff    = 1;
    FT_Bool             sfnt_format = 0;


    sfnt = (SFNT_Interface*)FT_Get_Module_Interface(
             face->root.driver->root.library, "sfnt" );
    if ( !sfnt )
      goto Bad_Format;

    psnames = (PSNames_Interface*)FT_Get_Module_Interface(
                face->root.driver->root.library, "psnames" );

    /* create input stream from resource */
    if ( FILE_Seek( 0 ) )
      goto Exit;

    /* check that we have a valid OpenType file */
    error = sfnt->init_face( stream, face, face_index, num_params, params );
    if ( !error )
    {
      if ( face->format_tag != 0x4F54544FL )  /* `OTTO'; OpenType/CFF font */
      {