kc3-lang/freetype/src/cff/cffcmap.c

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• Hash : b72d8a85
  Author :
  Date : 2003-09-29T20:33:37
  

  * include/freetype/internal/services/svpsname.h (added), include/freetype/internal/psnames.h (removed), include/freetype/internal/internal.h (FT_SERVICE_POSTSCRIPT_NAMES): added new service to handle glyph name dictionaries, replacing the old internal header named "psnames.h" by "services/svpsname.h" note that this is different from "services/svpostnm.h" which only handles the retrieval of Postscript font name for a given face. (should we merge these two services into a single header ??) * include/freetype/internal/ftserv.h: adding FT_FACE_FIND_GLOBAL_SERVICE (used to lookup a service globally, instead of only within the current module) * include/freetype/internal/ftobjs.h, src/base/ftobjs.c: adding the new base function ft_module_get_service

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• src/cff/cffcmap.c

• /***************************************************************************/
  /*                                                                         */
  /*  cffcmap.c                                                              */
  /*                                                                         */
  /*    CFF character mapping table (cmap) support (body).                   */
  /*                                                                         */
  /*  Copyright 2002, 2003 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 "cffcmap.h"
  #include "cffload.h"
  
  #include "cfferrs.h"
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****           CFF STANDARD (AND EXPERT) ENCODING CMAPS            *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
    FT_CALLBACK_DEF( FT_Error )
    cff_cmap_encoding_init( CFF_CMapStd  cmap )
    {
      TT_Face       face     = (TT_Face)FT_CMAP_FACE( cmap );
      CFF_Font      cff      = (CFF_Font)face->extra.data;
      CFF_Encoding  encoding = &cff->encoding;
  
  
      cmap->gids  = encoding->codes;
  
      return 0;
    }
  
  
    FT_CALLBACK_DEF( void )
    cff_cmap_encoding_done( CFF_CMapStd  cmap )
    {
      cmap->gids  = NULL;
    }
  
  
    FT_CALLBACK_DEF( FT_UInt )
    cff_cmap_encoding_char_index( CFF_CMapStd  cmap,
                                  FT_UInt32    char_code )
    {
      FT_UInt  result = 0;
  
  
      if ( char_code < 256 )
        result = cmap->gids[char_code];
  
      return result;
    }
  
  
    FT_CALLBACK_DEF( FT_UInt )
    cff_cmap_encoding_char_next( CFF_CMapStd   cmap,
                                 FT_UInt32    *pchar_code )
    {
      FT_UInt    result    = 0;
      FT_UInt32  char_code = *pchar_code;
  
  
      *pchar_code = 0;
  
      if ( char_code < 255 )
      {
        FT_UInt  code = (FT_UInt)(char_code + 1);
  
  
        for (;;)
        {
          if ( code >= 256 )
            break;
  
          result = cmap->gids[code];
          if ( result != 0 )
          {
            *pchar_code = code;
            break;
          }
  
          code++;
        }
      }
      return result;
    }
  
  
    FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
    cff_cmap_encoding_class_rec =
    {
      sizeof ( CFF_CMapStdRec ),
  
      (FT_CMap_InitFunc)     cff_cmap_encoding_init,
      (FT_CMap_DoneFunc)     cff_cmap_encoding_done,
      (FT_CMap_CharIndexFunc)cff_cmap_encoding_char_index,
      (FT_CMap_CharNextFunc) cff_cmap_encoding_char_next
    };
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****              CFF SYNTHETIC UNICODE ENCODING CMAP              *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
    FT_CALLBACK_DEF( FT_Int )
    cff_cmap_uni_pair_compare( const void*  pair1,
                               const void*  pair2 )
    {
      FT_UInt32  u1 = ((CFF_CMapUniPair)pair1)->unicode;
      FT_UInt32  u2 = ((CFF_CMapUniPair)pair2)->unicode;
  
  
      if ( u1 < u2 )
        return -1;
  
      if ( u1 > u2 )
        return +1;
  
      return 0;
    }
  
  
    FT_CALLBACK_DEF( FT_Error )
    cff_cmap_unicode_init( CFF_CMapUnicode  cmap )
    {
      FT_Error            error;
      FT_UInt             count;
      TT_Face             face    = (TT_Face)FT_CMAP_FACE( cmap );
      FT_Memory           memory  = FT_FACE_MEMORY( face );
      CFF_Font            cff     = (CFF_Font)face->extra.data;
      CFF_Charset         charset = &cff->charset;
      FT_Service_PsNames  psnames = (FT_Service_PsNames)cff->psnames;
  
  
      cmap->num_pairs = 0;
      cmap->pairs     = NULL;
  
      count = (FT_UInt)face->root.num_glyphs;
  
      if ( !FT_NEW_ARRAY( cmap->pairs, count ) )
      {
        FT_UInt          n, new_count;
        CFF_CMapUniPair  pair;
        FT_UInt32        uni_code;
  
  
        pair = cmap->pairs;
        for ( n = 0; n < count; n++ )
        {
          FT_UInt      sid = charset->sids[n];
          const char*  gname;
  
  
          gname = cff_index_get_sid_string( &cff->string_index, sid, psnames );
  
          /* build unsorted pair table by matching glyph names */
          if ( gname )
          {
            uni_code = psnames->unicode_value( gname );
  
            if ( uni_code != 0 )
            {
              pair->unicode = uni_code;
              pair->gindex  = n;
              pair++;
            }
  
            FT_FREE( gname );
          }
        }
  
        new_count = (FT_UInt)( pair - cmap->pairs );
        if ( new_count == 0 )
        {
          /* there are no unicode characters in here! */
          FT_FREE( cmap->pairs );
          error = CFF_Err_Invalid_Argument;
        }
        else
        {
          /* re-allocate if the new array is much smaller than the original */
          /* one                                                            */
          if ( new_count != count && new_count < count / 2 )
          {
            (void)FT_RENEW_ARRAY( cmap->pairs, count, new_count );
            error = 0;
          }
  
          /* sort the pairs table to allow efficient binary searches */
          ft_qsort( cmap->pairs,
                    new_count,
                    sizeof ( CFF_CMapUniPairRec ),
                    cff_cmap_uni_pair_compare );
  
          cmap->num_pairs = new_count;
        }
      }
  
      return error;
    }
  
  
    FT_CALLBACK_DEF( void )
    cff_cmap_unicode_done( CFF_CMapUnicode  cmap )
    {
      FT_Face    face   = FT_CMAP_FACE( cmap );
      FT_Memory  memory = FT_FACE_MEMORY( face );
  
  
      FT_FREE( cmap->pairs );
      cmap->num_pairs = 0;
    }
  
  
    FT_CALLBACK_DEF( FT_UInt )
    cff_cmap_unicode_char_index( CFF_CMapUnicode  cmap,
                                 FT_UInt32        char_code )
    {
      FT_UInt          min = 0;
      FT_UInt          max = cmap->num_pairs;
      FT_UInt          mid;
      CFF_CMapUniPair  pair;
  
  
      while ( min < max )
      {
        mid  = min + ( max - min ) / 2;
        pair = cmap->pairs + mid;
  
        if ( pair->unicode == char_code )
          return pair->gindex;
  
        if ( pair->unicode < char_code )
          min = mid + 1;
        else
          max = mid;
      }
      return 0;
    }
  
  
    FT_CALLBACK_DEF( FT_UInt )
    cff_cmap_unicode_char_next( CFF_CMapUnicode  cmap,
                                FT_UInt32       *pchar_code )
    {
      FT_UInt    result    = 0;
      FT_UInt32  char_code = *pchar_code + 1;
  
  
    Restart:
      {
        FT_UInt          min = 0;
        FT_UInt          max = cmap->num_pairs;
        FT_UInt          mid;
        CFF_CMapUniPair  pair;
  
  
        while ( min < max )
        {
          mid  = min + ( ( max - min ) >> 1 );
          pair = cmap->pairs + mid;
  
          if ( pair->unicode == char_code )
          {
            result = pair->gindex;
            if ( result != 0 )
              goto Exit;
  
            char_code++;
            goto Restart;
          }
  
          if ( pair->unicode < char_code )
            min = mid+1;
          else
            max = mid;
        }
  
        /* we didn't find it, but we have a pair just above it */
        char_code = 0;
  
        if ( min < cmap->num_pairs )
        {
          pair   = cmap->pairs + min;
          result = pair->gindex;
          if ( result != 0 )
            char_code = pair->unicode;
        }
      }
  
    Exit:
      *pchar_code = char_code;
      return result;
    }
  
  
    FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
    cff_cmap_unicode_class_rec =
    {
      sizeof ( CFF_CMapUnicodeRec ),
  
      (FT_CMap_InitFunc)     cff_cmap_unicode_init,
      (FT_CMap_DoneFunc)     cff_cmap_unicode_done,
      (FT_CMap_CharIndexFunc)cff_cmap_unicode_char_index,
      (FT_CMap_CharNextFunc) cff_cmap_unicode_char_next
    };
  
  
  /* END */
  

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