psmodule.c

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Author : Oran Agra
Date : 2009-04-05 18:18:03
Hash : 24b110c6
Message : Position Independent Code (PIC) support in psnames module. * include/freetype/internal/services/svpscmap.h add macros to init instances of FT_Service_PsCMapsRec. * src/psnames/psmodule.h declare psnames_module_class using macros from ftmodapi.h, when FT_CONFIG_OPTION_PIC is defined create and destroy functions will be declared. * src/psnames/psmodule.c when FT_CONFIG_OPTION_PIC is defined pscmaps_interface and pscmaps_services structs and psnames_module_class array will have functions to init or create and destroy them instead of being allocated in the global scope. And macros will be used from pspic.h in order to access them. New Files: * src/psnames/pspic.h declare struct to hold PIC globals for psnames module and macros to access them. * src/psnames/pspic.c implement functions to allocate, destroy and initialize PIC globals for psnames module. * src/psnames/psnames.c add new file to build: pspic.c. * src/psnames/jamfile add new files to FT2_MULTI build: pspic.c.
src/psnames/psmodule.c
/***************************************************************************/
/*                                                                         */
/*  psmodule.c                                                             */
/*                                                                         */
/*    PSNames module implementation (body).                                */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003, 2005, 2006, 2007, 2008 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_OBJECTS_H
#include FT_SERVICE_POSTSCRIPT_CMAPS_H

#include "psmodule.h"
#include "pstables.h"

#include "psnamerr.h"
#include "pspic.h"


#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES


#ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST


#define VARIANT_BIT         0x80000000UL
#define BASE_GLYPH( code )  ( (code) & ~VARIANT_BIT )


  /* Return the Unicode value corresponding to a given glyph.  Note that */
  /* we do deal with glyph variants by detecting a non-initial dot in    */
  /* the name, as in `A.swash' or `e.final'; in this case, the           */
  /* VARIANT_BIT is set in the return value.                             */
  /*                                                                     */
  static FT_UInt32
  ps_unicode_value( const char*  glyph_name )
  {
    /* If the name begins with `uni', then the glyph name may be a */
    /* hard-coded unicode character code.                          */
    if ( glyph_name[0] == 'u' &&
         glyph_name[1] == 'n' &&
         glyph_name[2] == 'i' )
    {
      /* determine whether the next four characters following are */
      /* hexadecimal.                                             */

      /* XXX: Add code to deal with ligatures, i.e. glyph names like */
      /*      `uniXXXXYYYYZZZZ'...                                   */

      FT_Int       count;
      FT_ULong     value = 0;
      const char*  p     = glyph_name + 3;


      for ( count = 4; count > 0; count--, p++ )
      {
        char          c = *p;
        unsigned int  d;


        d = (unsigned char)c - '0';
        if ( d >= 10 )
        {
          d = (unsigned char)c - 'A';
          if ( d >= 6 )
            d = 16;
          else
            d += 10;
        }

        /* Exit if a non-uppercase hexadecimal character was found   */
        /* -- this also catches character codes below `0' since such */
        /* negative numbers cast to `unsigned int' are far too big.  */
        if ( d >= 16 )
          break;

        value = ( value << 4 ) + d;
      }

      /* there must be exactly four hex digits */
      if ( count == 0 )
      {
        if ( *p == '\0' )
          return value;
        if ( *p == '.' )
          return value | VARIANT_BIT;
      }
    }

    /* If the name begins with `u', followed by four to six uppercase */
    /* hexadecimal digits, it is a hard-coded unicode character code. */
    if ( glyph_name[0] == 'u' )
    {
      FT_Int       count;
      FT_ULong     value = 0;
      const char*  p     = glyph_name + 1;


      for ( count = 6; count > 0; count--, p++ )
      {
        char          c = *p;
        unsigned int  d;


        d = (unsigned char)c - '0';
        if ( d >= 10 )
        {
          d = (unsigned char)c - 'A';
          if ( d >= 6 )
            d = 16;
          else
            d += 10;
        }

        if ( d >= 16 )
          break;

        value = ( value << 4 ) + d;
      }

      if ( count <= 2 )
      {
        if ( *p == '\0' )
          return value;
        if ( *p == '.' )
          return value | VARIANT_BIT;
      }
    }

    /* Look for a non-initial dot in the glyph name in order to */
    /* find variants like `A.swash', `e.final', etc.            */
    {
      const char*  p   = glyph_name;
      const char*  dot = NULL;


      for ( ; *p; p++ )
      {
        if ( *p == '.' && p > glyph_name )
        {
          dot = p;
          break;
        }
      }

      /* now look up the glyph in the Adobe Glyph List */
      if ( !dot )
        return ft_get_adobe_glyph_index( glyph_name, p );
      else
        return ft_get_adobe_glyph_index( glyph_name, dot ) | VARIANT_BIT;
    }
  }


  /* ft_qsort callback to sort the unicode map */
  FT_CALLBACK_DEF( int )
  compare_uni_maps( const void*  a,
                    const void*  b )
  {
    PS_UniMap*  map1 = (PS_UniMap*)a;
    PS_UniMap*  map2 = (PS_UniMap*)b;
    FT_UInt32   unicode1 = BASE_GLYPH( map1->unicode );
    FT_UInt32   unicode2 = BASE_GLYPH( map2->unicode );


    /* sort base glyphs before glyph variants */
    if ( unicode1 == unicode2 )
    {
      if ( map1->unicode > map2->unicode )
        return 1;
      else if ( map1->unicode < map2->unicode )
        return -1;
      else
        return 0;
    }
    else
    {
      if ( unicode1 > unicode2 )
        return 1;
      else if ( unicode1 < unicode2 )
        return -1;
      else
        return 0;
    }
  }


  /* support for extra glyphs not handled (well) in AGL; */
  /* we add extra mappings for them if necessary         */

#define EXTRA_GLYPH_LIST_SIZE  10

  static const FT_UInt32  ft_extra_glyph_unicodes[EXTRA_GLYPH_LIST_SIZE] =
  {
    /* WGL 4 */
    0x0394,
    0x03A9,
    0x2215,
    0x00AD,
    0x02C9,
    0x03BC,
    0x2219,
    0x00A0,
    /* Romanian */
    0x021A,
    0x021B
  };

  static const char  ft_extra_glyph_names[] =
  {
    'D','e','l','t','a',0,
    'O','m','e','g','a',0,
    'f','r','a','c','t','i','o','n',0,
    'h','y','p','h','e','n',0,
    'm','a','c','r','o','n',0,
    'm','u',0,
    'p','e','r','i','o','d','c','e','n','t','e','r','e','d',0,
    's','p','a','c','e',0,
    'T','c','o','m','m','a','a','c','c','e','n','t',0,
    't','c','o','m','m','a','a','c','c','e','n','t',0
  };

  static const FT_Int
  ft_extra_glyph_name_offsets[EXTRA_GLYPH_LIST_SIZE] =
  {
     0,
     6,
    12,
    21,
    28,
    35,
    38,
    53,
    59,
    72
  };


  static void
  ps_check_extra_glyph_name( const char*  gname,
                             FT_UInt      glyph,
                             FT_UInt*     extra_glyphs,
                             FT_UInt     *states )
  {
    FT_UInt  n;


    for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ )
    {
      if ( ft_strcmp( ft_extra_glyph_names +
                        ft_extra_glyph_name_offsets[n], gname ) == 0 )
      {
        if ( states[n] == 0 )
        {
          /* mark this extra glyph as a candidate for the cmap */
          states[n]     = 1;
          extra_glyphs[n] = glyph;
        }

        return;
      }
    }
  }


  static void
  ps_check_extra_glyph_unicode( FT_UInt32  uni_char,
                                FT_UInt   *states )
  {
    FT_UInt  n;


    for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ )
    {
      if ( uni_char == ft_extra_glyph_unicodes[n] )
      {
        /* disable this extra glyph from being added to the cmap */
        states[n] = 2;

        return;
      }
    }
  }


  /* Build a table that maps Unicode values to glyph indices. */
  static FT_Error
  ps_unicodes_init( FT_Memory             memory,
                    PS_Unicodes           table,
                    FT_UInt               num_glyphs,
                    PS_GetGlyphNameFunc   get_glyph_name,
                    PS_FreeGlyphNameFunc  free_glyph_name,
                    FT_Pointer            glyph_data )
  {
    FT_Error  error;

    FT_UInt  extra_glyph_list_states[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    FT_UInt  extra_glyphs[EXTRA_GLYPH_LIST_SIZE];


    /* we first allocate the table */
    table->num_maps = 0;
    table->maps     = 0;

    if ( !FT_NEW_ARRAY( table->maps, num_glyphs + EXTRA_GLYPH_LIST_SIZE ) )
    {
      FT_UInt     n;
      FT_UInt     count;
      PS_UniMap*  map;
      FT_UInt32   uni_char;


      map = table->maps;

      for ( n = 0; n < num_glyphs; n++ )
      {
        const char*  gname = get_glyph_name( glyph_data, n );


        if ( gname )
        {
          ps_check_extra_glyph_name( gname, n,
                                     extra_glyphs, extra_glyph_list_states );
          uni_char = ps_unicode_value( gname );

          if ( BASE_GLYPH( uni_char ) != 0 )
          {
            ps_check_extra_glyph_unicode( uni_char,
                                          extra_glyph_list_states );
            map->unicode     = uni_char;
            map->glyph_index = n;
            map++;
          }

          if ( free_glyph_name )
            free_glyph_name( glyph_data, gname );
        }
      }

      for ( n = 0; n < EXTRA_GLYPH_LIST_SIZE; n++ )
      {
        if ( extra_glyph_list_states[n] == 1 )
        {
          /* This glyph name has an additional representation. */
          /* Add it to the cmap.                               */

          map->unicode     = ft_extra_glyph_unicodes[n];
          map->glyph_index = extra_glyphs[n];
          map++;
        }
      }

      /* now compress the table a bit */
      count = (FT_UInt)( map - table->maps );

      if ( count == 0 )
      {
        FT_FREE( table->maps );
        if ( !error )
          error = PSnames_Err_Invalid_Argument;  /* No unicode chars here! */
      }
      else {
        /* Reallocate if the number of used entries is much smaller. */
        if ( count < num_glyphs / 2 )
        {
          (void)FT_RENEW_ARRAY( table->maps, num_glyphs, count );
          error = PSnames_Err_Ok;
        }

        /* Sort the table in increasing order of unicode values, */
        /* taking care of glyph variants.                        */
        ft_qsort( table->maps, count, sizeof ( PS_UniMap ),
                  compare_uni_maps );
      }

      table->num_maps = count;
    }

    return error;
  }


  static FT_UInt
  ps_unicodes_char_index( PS_Unicodes  table,
                          FT_UInt32    unicode )
  {
    PS_UniMap  *min, *max, *mid, *result = NULL;


    /* Perform a binary search on the table. */

    min = table->maps;
    max = min + table->num_maps - 1;

    while ( min <= max )
    {
      FT_UInt32  base_glyph;


      mid = min + ( ( max - min ) >> 1 );

      if ( mid->unicode == unicode )
      {
        result = mid;
        break;
      }

      base_glyph = BASE_GLYPH( mid->unicode );

      if ( base_glyph == unicode )
        result = mid; /* remember match but continue search for base glyph */

      if ( min == max )
        break;

      if ( base_glyph < unicode )
        min = mid + 1;
      else
        max = mid - 1;
    }

    if ( result )
      return result->glyph_index;
    else
      return 0;
  }


  static FT_ULong
  ps_unicodes_char_next( PS_Unicodes  table,
                         FT_UInt32   *unicode )
  {
    FT_UInt    result    = 0;
    FT_UInt32  char_code = *unicode + 1;


    {
      FT_UInt     min = 0;
      FT_UInt     max = table->num_maps;
      FT_UInt     mid;
      PS_UniMap*  map;
      FT_UInt32   base_glyph;


      while ( min < max )
      {
        mid = min + ( ( max - min ) >> 1 );
        map = table->maps + mid;

        if ( map->unicode == char_code )
        {
          result = map->glyph_index;
          goto Exit;
        }

        base_glyph = BASE_GLYPH( map->unicode );

        if ( base_glyph == char_code )
          result = map->glyph_index;

        if ( base_glyph < char_code )
          min = mid + 1;
        else
          max = mid;
      }

      if ( result )
        goto Exit;               /* we have a variant glyph */

      /* we didn't find it; check whether we have a map just above it */
      char_code = 0;

      if ( min < table->num_maps )
      {
        map       = table->maps + min;
        result    = map->glyph_index;
        char_code = BASE_GLYPH( map->unicode );
      }
    }

  Exit:
    *unicode = char_code;
    return result;
  }


#endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */


  static const char*
  ps_get_macintosh_name( FT_UInt  name_index )
  {
    if ( name_index >= FT_NUM_MAC_NAMES )
      name_index = 0;

    return ft_standard_glyph_names + ft_mac_names[name_index];
  }


  static const char*
  ps_get_standard_strings( FT_UInt  sid )
  {
    if ( sid >= FT_NUM_SID_NAMES )
      return 0;

    return ft_standard_glyph_names + ft_sid_names[sid];
  }


#ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST
  FT_DEFINE_SERVICE_PSCMAPSREC(pscmaps_interface, 
    (PS_Unicode_ValueFunc)     ps_unicode_value,
    (PS_Unicodes_InitFunc)     ps_unicodes_init,
    (PS_Unicodes_CharIndexFunc)ps_unicodes_char_index,
    (PS_Unicodes_CharNextFunc) ps_unicodes_char_next,

    (PS_Macintosh_NameFunc)    ps_get_macintosh_name,
    (PS_Adobe_Std_StringsFunc) ps_get_standard_strings,

    t1_standard_encoding,
    t1_expert_encoding
  )

#else

  FT_DEFINE_SERVICE_PSCMAPSREC(pscmaps_interface, 
    0,
    0,
    0,
    0,

    (PS_Macintosh_NameFunc)    ps_get_macintosh_name,
    (PS_Adobe_Std_StringsFunc) ps_get_standard_strings,

    t1_standard_encoding,
    t1_expert_encoding
  )

#endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */


  FT_DEFINE_SERVICEDESCREC1(pscmaps_services, 
    FT_SERVICE_ID_POSTSCRIPT_CMAPS, &FT_PSCMAPS_INTERFACE_GET
  )




  static FT_Pointer
  psnames_get_service( FT_Module    module,
                       const char*  service_id )
  {
    FT_Library library = module->library;
    FT_UNUSED(library);

    return ft_service_list_lookup( FT_PSCMAPS_SERVICES_GET, service_id );
  }

#endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */


#ifndef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
#define PUT_PS_NAMES_SERVICE(a) 0
#else
#define PUT_PS_NAMES_SERVICE(a) a
#endif

  FT_DEFINE_MODULE(psnames_module_class,
  
    0,  /* this is not a font driver, nor a renderer */
    sizeof ( FT_ModuleRec ),

    "psnames",  /* driver name                         */
    0x10000L,   /* driver version                      */
    0x20000L,   /* driver requires FreeType 2 or above */

    PUT_PS_NAMES_SERVICE((void*)&FT_PSCMAPS_INTERFACE_GET),   /* module specific interface */
    (FT_Module_Constructor)0,
    (FT_Module_Destructor) 0,
    (FT_Module_Requester)  PUT_PS_NAMES_SERVICE(psnames_get_service)
  )



/* END */
kc3-lang/freetype/src/psnames/psmodule.c

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kc3-lang/freetype /src/psnames/psmodule.c
