ttpost.c

Trolltech公司发布的基于C++图形开发环境

/***************************************************************************/
/*                                                                         */
/*  ttpost.c                                                               */
/*                                                                         */
/*    Postcript name table processing for TrueType and OpenType fonts      */
/*    (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.                                        */
/*                                                                         */
/***************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* The post table is not completely loaded by the core engine.  This     */
  /* file loads the missing PS glyph names and implements an API to access */
  /* them.                                                                 */
  /*                                                                       */
  /*************************************************************************/


#include <freetype/internal/ftstream.h>
#include <freetype/internal/tterrors.h>
#include <freetype/tttags.h>


#ifdef FT_FLAT_COMPILE

#include "ttpost.h"
#include "ttload.h"

#else

#include <sfnt/ttpost.h>
#include <sfnt/ttload.h>

#endif


  /*************************************************************************/
  /*                                                                       */
  /* 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_ttpost


  /* If this configuration macro is defined, we rely on the `PSNames' */
  /* module to grab the glyph names.                                  */

#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES


#include <freetype/internal/psnames.h>

#define MAC_NAME( x )  ( (FT_String*)psnames->macintosh_name( x ) )


#else /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */


   /* Otherwise, we ignore the `PSNames' module, and provide our own  */
   /* table of Mac names.  Thus, it is possible to build a version of */
   /* FreeType without the Type 1 driver & PSNames module.            */

#define  MAC_NAME( x )  TT_Post_Default_Names[x]

  /* the 258 default Mac PS glyph names */

  FT_String*  TT_Post_Default_Names[258] =
  {
    /*   0 */
    ".notdef", ".null", "CR", "space", "exclam",
    "quotedbl", "numbersign", "dollar", "percent", "ampersand",
    /*  10 */
    "quotesingle", "parenleft", "parenright", "asterisk", "plus",
    "comma", "hyphen", "period", "slash", "zero",
    /*  20 */
    "one", "two", "three", "four", "five",
    "six", "seven", "eight", "nine", "colon",
    /*  30 */
    "semicolon", "less", "equal", "greater", "question",
    "at", "A", "B", "C", "D",
    /*  40 */
    "E", "F", "G", "H", "I",
    "J", "K", "L", "M", "N",
    /*  50 */
    "O", "P", "Q", "R", "S",
    "T", "U", "V", "W", "X",
    /*  60 */
    "Y", "Z", "bracketleft", "backslash", "bracketright",
    "asciicircum", "underscore", "grave", "a", "b",
    /*  70 */
    "c", "d", "e", "f", "g",
    "h", "i", "j", "k", "l",
    /*  80 */
    "m", "n", "o", "p", "q",
    "r", "s", "t", "u", "v",
    /*  90 */
    "w", "x", "y", "z", "braceleft",
    "bar", "braceright", "asciitilde", "Adieresis", "Aring",
    /* 100 */
    "Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis",
    "aacute", "agrave", "acircumflex", "adieresis", "atilde",
    /* 110 */
    "aring", "ccedilla", "eacute", "egrave", "ecircumflex",
    "edieresis", "iacute", "igrave", "icircumflex", "idieresis",
    /* 120 */
    "ntilde", "oacute", "ograve", "ocircumflex", "odieresis",
    "otilde", "uacute", "ugrave", "ucircumflex", "udieresis",
    /* 130 */
    "dagger", "degree", "cent", "sterling", "section",
    "bullet", "paragraph", "germandbls", "registered", "copyright",
    /* 140 */
    "trademark", "acute", "dieresis", "notequal", "AE",
    "Oslash", "infinity", "plusminus", "lessequal", "greaterequal",
    /* 150 */
    "yen", "mu", "partialdiff", "summation", "product",
    "pi", "integral", "ordfeminine", "ordmasculine", "Omega",
    /* 160 */
    "ae", "oslash", "questiondown", "exclamdown", "logicalnot",
    "radical", "florin", "approxequal", "Delta", "guillemotleft",
    /* 170 */
    "guillemotright", "ellipsis", "nbspace", "Agrave", "Atilde",
    "Otilde", "OE", "oe", "endash", "emdash",
    /* 180 */
    "quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide",
    "lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
    /* 190 */
    "guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl",
    "periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
    /* 200 */
    "Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
    "Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
    /* 210 */
    "apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave",
    "dotlessi", "circumflex", "tilde", "macron", "breve",
    /* 220 */
    "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek",
    "caron", "Lslash", "lslash", "Scaron", "scaron",
    /* 230 */
    "Zcaron", "zcaron", "brokenbar", "Eth", "eth",
    "Yacute", "yacute", "Thorn", "thorn", "minus",
    /* 240 */
    "multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf",
    "onequarter", "threequarters", "franc", "Gbreve", "gbreve",
    /* 250 */
    "Idot", "Scedilla", "scedilla", "Cacute", "cacute",
    "Ccaron", "ccaron", "dmacron",
  };


#endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */


  static
  FT_Error  Load_Format_20( TT_Face    face,
                            FT_Stream  stream )
  {
    FT_Memory  memory = stream->memory;
    FT_Error   error;

    FT_Int     num_glyphs;
    FT_UShort  num_names;

    FT_UShort* glyph_indices = 0;
    FT_Char**  name_strings  = 0;


    if ( READ_UShort( num_glyphs ) )
      goto Exit;

    /* UNDOCUMENTED!  The number of glyphs in this table can be smaller */
    /* than the value in the maxp table (cf. cyberbit.ttf).             */

    /* There already exist fonts which have more than 32768 glyph names */
    /* in this table, so the test for this threshold has been dropped.  */

    if ( num_glyphs > face->root.num_glyphs )
    {
      error = TT_Err_Invalid_File_Format;
      goto Exit;
    }

    /* load the indices */
    {
      FT_Int  n;


      if ( ALLOC_ARRAY ( glyph_indices, num_glyphs, FT_UShort ) ||
           ACCESS_Frame( num_glyphs * 2L )                      )
        goto Fail;

      for ( n = 0; n < num_glyphs; n++ )
        glyph_indices[n] = GET_UShort();

      FORGET_Frame();
    }

    /* compute number of names stored in table */
    {
      FT_Int  n;


      num_names = 0;

      for ( n = 0; n < num_glyphs; n++ )
      {
        FT_Int  index;


        index = glyph_indices[n];
        if ( index >= 258 )
        {
          index -= 257;
          if ( index > num_names )
            num_names = index;
        }
      }
    }

    /* now load the name strings */
    {
      FT_UShort  n;


      if ( ALLOC_ARRAY( name_strings, num_names, FT_Char* ) )
        goto Fail;

      for ( n = 0; n < num_names; n++ )
      {
        FT_UInt  len;


        if ( READ_Byte  ( len )                               ||
             ALLOC_ARRAY( name_strings[n], len + 1, FT_Char ) ||
             FILE_Read  ( name_strings[n], len )              )
          goto Fail1;

        name_strings[n][len] = '\0';
      }
    }

    /* all right, set table fields and exit successfuly */
    {
      TT_Post_20*  table = &face->postscript_names.names.format_20;


      table->num_glyphs    = num_glyphs;
      table->num_names     = num_names;
      table->glyph_indices = glyph_indices;
      table->glyph_names   = name_strings;
    }
    return TT_Err_Ok;


  Fail1:
    {
      FT_UShort  n;


      for ( n = 0; n < num_names; n++ )
        FREE( name_strings[n] );
    }