sfdriver.c

一个Xpdf应用的例子

/***************************************************************************/
/*                                                                         */
/*  sfdriver.c                                                             */
/*                                                                         */
/*    High-level SFNT driver interface (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_SFNT_H
#include FT_INTERNAL_OBJECTS_H

#include "sfdriver.h"
#include "ttload.h"
#include "ttcmap.h"
#include "sfobjs.h"

#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
#include "ttsbit.h"
#endif

#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
#include "ttpost.h"
#endif

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


  static void*
  get_sfnt_table( TT_Face      face,
                  FT_Sfnt_Tag  tag )
  {
    void*  table;


    switch ( tag )
    {
    case ft_sfnt_head:
      table = &face->header;
      break;

    case ft_sfnt_hhea:
      table = &face->horizontal;
      break;

    case ft_sfnt_vhea:
      table = face->vertical_info ? &face->vertical : 0;
      break;

    case ft_sfnt_os2:
      table = face->os2.version == 0xFFFF ? 0 : &face->os2;
      break;

    case ft_sfnt_post:
      table = &face->postscript;
      break;

    case ft_sfnt_maxp:
      table = &face->max_profile;
      break;

    case ft_sfnt_pclt:
      table = face->pclt.Version ? &face->pclt : 0;
      break;

    default:
      table = 0;
    }

    return table;
  }


#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES


  static FT_Error
  get_sfnt_glyph_name( TT_Face     face,
                       FT_UInt     glyph_index,
                       FT_Pointer  buffer,
                       FT_UInt     buffer_max )
  {
    FT_String*  gname;
    FT_Error    error;


    error = TT_Get_PS_Name( face, glyph_index, &gname );
    if ( !error && buffer_max > 0 )
    {
      FT_UInt  len = (FT_UInt)( strlen( gname ) );


      if ( len >= buffer_max )
        len = buffer_max - 1;

      MEM_Copy( buffer, gname, len );
      ((FT_Byte*)buffer)[len] = 0;
    }

    return error;
  }


  static const char*
  get_sfnt_postscript_name( TT_Face  face )
  {
    FT_Int  n, found_win, found_apple;


    /* shouldn't happen, but just in case to avoid memory leaks */
    if ( face->root.internal->postscript_name )
      return face->root.internal->postscript_name;

    /* scan the name table to see whether we have a Postscript name here, */
    /* either in Macintosh or Windows platform encodings                  */
    found_win     = -1;
    found_apple   = -1;
    
    for ( n = 0; n < face->num_names; n++ )
    {
      TT_NameRec*  name = face->name_table.names + n;


      if ( name->nameID == 6 && name->string != NULL )
      {
        if ( name->platformID == 3     &&
             name->encodingID == 1     &&
             name->languageID == 0x409 )
          found_win = n;
          
        if ( name->platformID == 1 &&
             name->encodingID == 0 &&
             name->languageID == 0 )
          found_apple = n;
      }
    }
    
    if ( found_win )
    {
      FT_Memory    memory = face->root.memory;
      TT_NameRec*  name   = face->name_table.names + found_win;
      FT_UInt      len    = name->stringLength/2;
      FT_Error     error;
      FT_String*   result;
      
      if ( !ALLOC( result, len+1 ) )
      {
        FT_String*  r = result;
        FT_Byte*    p = (FT_Byte*) name->string;
        
        for ( ; len > 0; len--, p += 2 )
        {
          if ( p[0] == 0 && p[1] >= 32 && p[1] < 128 )
            *r++ = p[1];
        }
        *r = '\0';
      }
      return result;
    }

    if ( found_apple )
    {
      FT_Memory    memory = face->root.memory;
      TT_NameRec*  name   = face->name_table.names + found_win;
      FT_UInt      len    = name->stringLength;
      FT_Error     error;
      FT_String*   result;
      
      if ( !ALLOC( result, len+1 ) )
      {
        MEM_Copy( result, name->string, len );
        result[len] = '\0';
      }
      return result;
    }

    return NULL;
  }


#endif /* TT_CONFIG_OPTION_POSTSCRIPT_NAMES */


  FT_CALLBACK_DEF( FT_Module_Interface )
  SFNT_Get_Interface( FT_Module    module,
                      const char*  interface )
  {
    FT_UNUSED( module );

    if ( strcmp( interface, "get_sfnt" ) == 0 )
      return (FT_Module_Interface)get_sfnt_table;

#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
    if ( strcmp( interface, "glyph_name" ) == 0 )
      return (FT_Module_Interface)get_sfnt_glyph_name;
#endif

    if ( strcmp( interface, "postscript_name" ) == 0 )
      return (FT_Module_Interface)get_sfnt_postscript_name;

    return 0;
  }


  static
  const SFNT_Interface  sfnt_interface =
  {
    TT_Goto_Table,

    SFNT_Init_Face,
    SFNT_Load_Face,
    SFNT_Done_Face,
    SFNT_Get_Interface,

    TT_Load_Any,
    TT_Load_SFNT_Header,
    TT_Load_Directory,

    TT_Load_Header,
    TT_Load_Metrics_Header,
    TT_Load_CMap,
    TT_Load_MaxProfile,
    TT_Load_OS2,
    TT_Load_PostScript,

    TT_Load_Names,
    TT_Free_Names,

    TT_Load_Hdmx,
    TT_Free_Hdmx,

    TT_Load_Kern,
    TT_Load_Gasp,
    TT_Load_PCLT,

#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS

    /* see `ttload.h' */
    TT_Load_Bitmap_Header,

    /* see `ttsbit.h' */
    TT_Set_SBit_Strike,
    TT_Load_SBit_Strikes,
    TT_Load_SBit_Image,
    TT_Free_SBit_Strikes,

#else /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

    0,
    0,
    0,
    0,
    0,

#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES

    /* see `ttpost.h' */
    TT_Get_PS_Name,
    TT_Free_Post_Names,

#else /* TT_CONFIG_OPTION_POSTSCRIPT_NAMES */

    0,
    0,

#endif /* TT_CONFIG_OPTION_POSTSCRIPT_NAMES */

    /* see `ttcmap.h' */
    TT_CharMap_Load,
    TT_CharMap_Free,
  };


  FT_CALLBACK_TABLE_DEF
  const FT_Module_Class  sfnt_module_class =
  {
    0,  /* not a font driver or renderer */
    sizeof( FT_ModuleRec ),

    "sfnt",     /* driver name                            */
    0x10000L,   /* driver version 1.0                     */
    0x20000L,   /* driver requires FreeType 2.0 or higher */

    (const void*)&sfnt_interface,  /* module specific interface */

    (FT_Module_Constructor)0,
    (FT_Module_Destructor) 0,
    (FT_Module_Requester)  SFNT_Get_Interface
  };


/* END */