ref: 0977f294bab0345ba43fbf674449fd8e996c5719
dir: /libfreetype/psmodule.c/
/***************************************************************************/
/* */
/* psmodule.c */
/* */
/* PSNames module implementation (body). */
/* */
/* Copyright 1996-2001, 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 <ft2build.h>
#include FT_INTERNAL_POSTSCRIPT_NAMES_H
#include FT_INTERNAL_OBJECTS_H
#include "psmodule.h"
#include "pstables.h"
#include "psnamerr.h"
#ifndef FT_CONFIG_OPTION_NO_POSTSCRIPT_NAMES
#ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST
/* 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', etc. */
/* */
static FT_UInt32
ps_unicode_value( const char* glyph_name )
{
FT_Int n;
char first = glyph_name[0];
char temp[64];
/* 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 */
if ( d >= 16 )
break;
value = ( value << 4 ) + d;
}
if ( count == 0 )
return value;
}
/* look for a non-initial dot in the glyph name in order to */
/* sort-out variants like `A.swash', `e.final', etc. */
{
const char* p;
int len;
p = glyph_name;
while ( *p && *p != '.' )
p++;
len = (int)( p - glyph_name );
if ( *p && len < 64 )
{
ft_strncpy( temp, glyph_name, len );
temp[len] = 0;
glyph_name = temp;
}
}
/* now, look up the glyph in the Adobe Glyph List */
for ( n = 0; n < NUM_ADOBE_GLYPHS; n++ )
{
const char* name = sid_standard_names[n];
if ( first == name[0] && ft_strcmp( glyph_name, name ) == 0 )
return ps_names_to_unicode[n];
}
/* not found, there is probably no Unicode value for this glyph name */
return 0;
}
/* 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;
return ( map1->unicode - map2->unicode );
}
/* Builds a table that maps Unicode values to glyph indices */
static FT_Error
ps_build_unicode_table( FT_Memory memory,
FT_UInt num_glyphs,
const char** glyph_names,
PS_Unicodes* table )
{
FT_Error error;
/* we first allocate the table */
table->num_maps = 0;
table->maps = 0;
if ( !FT_NEW_ARRAY( table->maps, num_glyphs ) )
{
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 = glyph_names[n];
if ( gname )
{
uni_char = ps_unicode_value( gname );
if ( uni_char != 0 && uni_char != 0xFFFF )
{
map->unicode = uni_char;
map->glyph_index = n;
map++;
}
}
}
/* now, compress the table a bit */
count = (FT_UInt)( map - table->maps );
if ( count > 0 && FT_REALLOC( table->maps,
num_glyphs * sizeof ( PS_UniMap ),
count * sizeof ( PS_UniMap ) ) )
count = 0;
if ( count == 0 )
{
FT_FREE( table->maps );
if ( !error )
error = PSnames_Err_Invalid_Argument; /* no unicode chars here! */
}
else
/* sort the table in increasing order of unicode values */
ft_qsort( table->maps, count, sizeof ( PS_UniMap ), compare_uni_maps );
table->num_maps = count;
}
return error;
}
static FT_UInt
ps_lookup_unicode( PS_Unicodes* table,
FT_ULong unicode )
{
PS_UniMap *min, *max, *mid;
/* perform a binary search on the table */
min = table->maps;
max = min + table->num_maps - 1;
while ( min <= max )
{
mid = min + ( max - min ) / 2;
if ( mid->unicode == unicode )
return mid->glyph_index;
if ( min == max )
break;
if ( mid->unicode < unicode )
min = mid + 1;
else
max = mid - 1;
}
return 0xFFFF;
}
static FT_ULong
ps_next_unicode( PS_Unicodes* table,
FT_ULong unicode )
{
PS_UniMap *min, *max, *mid;
unicode++;
/* perform a binary search on the table */
min = table->maps;
max = min + table->num_maps - 1;
while ( min <= max )
{
mid = min + ( max - min ) / 2;
if ( mid->unicode == unicode )
return unicode;
if ( min == max )
break;
if ( mid->unicode < unicode )
min = mid + 1;
else
max = mid - 1;
}
if ( max < table->maps )
max = table->maps;
while ( max < table->maps + table->num_maps )
{
if ( unicode < max->unicode )
return max->unicode;
max++;
}
return 0;
}
#endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */
static const char*
ps_get_macintosh_name( FT_UInt name_index )
{
if ( name_index >= 258 )
name_index = 0;
return ps_glyph_names[mac_standard_names[name_index]];
}
static const char*
ps_get_standard_strings( FT_UInt sid )
{
return ( sid < NUM_SID_GLYPHS ? sid_standard_names[sid] : 0 );
}
static
const PSNames_Interface psnames_interface =
{
#ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST
(PS_Unicode_Value_Func) ps_unicode_value,
(PS_Build_Unicodes_Func) ps_build_unicode_table,
(PS_Lookup_Unicode_Func) ps_lookup_unicode,
#else
0,
0,
0,
#endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */
(PS_Macintosh_Name_Func) ps_get_macintosh_name,
(PS_Adobe_Std_Strings_Func) ps_get_standard_strings,
t1_standard_encoding,
t1_expert_encoding,
#ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST
(PS_Next_Unicode_Func) ps_next_unicode
#else
0
#endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */
};
#endif /* !FT_CONFIG_OPTION_NO_POSTSCRIPT_NAMES */
FT_CALLBACK_TABLE_DEF
const FT_Module_Class 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 */
#ifdef FT_CONFIG_OPTION_NO_POSTSCRIPT_NAMES
0,
#else
(void*)&psnames_interface, /* module specific interface */
#endif
(FT_Module_Constructor)0,
(FT_Module_Destructor) 0,
(FT_Module_Requester) 0
};
/* END */