ref: e16b4d85dd6b1cf14834387b765113114dabeae2
dir: /libfreetype/cffcmap.c/
/***************************************************************************/
/* */
/* cffcmap.c */
/* */
/* CFF character mapping table (cmap) support (body). */
/* */
/* Copyright 2002 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"
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** 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->count = encoding->count;
cmap->gids = encoding->codes;
return 0;
}
FT_CALLBACK_DEF( void )
cff_cmap_encoding_done( CFF_CMapStd cmap )
{
cmap->count = 0;
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 < cmap->count )
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 < cmap->count )
{
FT_UInt code = (FT_UInt)(char_code + 1);
for (;;)
{
if ( code >= cmap->count )
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;
PSNames_Service psnames = (PSNames_Service)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 = FT_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 */