ref: 8930cc96188c21a0ea5f7da7a6d00c4fefd86d3a
dir: /src/psnames/psmodule.c/
/****************************************************************************
*
* psmodule.c
*
* psnames module implementation (body).
*
* Copyright (C) 1996-2020 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_DEBUG_H
#include FT_INTERNAL_OBJECTS_H
#include FT_SERVICE_POSTSCRIPT_CMAPS_H
#include "psmodule.h"
/*
* The file `pstables.h' with its arrays and its function
* `ft_get_adobe_glyph_index' is useful for other projects also (for
* example, `pdfium' is using it). However, if used as a C++ header,
* including it in two different source files makes it necessary to use
* `extern const' for the declaration of its arrays, otherwise the data
* would be duplicated as mandated by the C++ standard.
*
* For this reason, we use `DEFINE_PS_TABLES' to guard the function
* definitions, and `DEFINE_PS_TABLES_DATA' to provide both proper array
* declarations and definitions.
*/
#include "pstables.h"
#define DEFINE_PS_TABLES
#define DEFINE_PS_TABLES_DATA
#include "pstables.h"
#include "psnamerr.h"
#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
#ifdef FT_CONFIG_OPTION_ADOBE_GLYPH_LIST
#define VARIANT_BIT 0x80000000UL
#define BASE_GLYPH( code ) ( (FT_UInt32)( (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_UInt32 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 (FT_UInt32)( 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_UInt32 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 (FT_UInt32)( 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_UInt32)ft_get_adobe_glyph_index( glyph_name, p );
else
return (FT_UInt32)( 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 = NULL;
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 )
{
/* No unicode chars here! */
FT_FREE( table->maps );
if ( !error )
error = FT_THROW( No_Unicode_Glyph_Name );
}
else
{
/* Reallocate if the number of used entries is much smaller. */
if ( count < num_glyphs / 2 )
{
(void)FT_RENEW_ARRAY( table->maps,
num_glyphs + EXTRA_GLYPH_LIST_SIZE,
count );
error = FT_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_UInt32
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, /* unicode_value */
(PS_Unicodes_InitFunc) ps_unicodes_init, /* unicodes_init */
(PS_Unicodes_CharIndexFunc)ps_unicodes_char_index, /* unicodes_char_index */
(PS_Unicodes_CharNextFunc) ps_unicodes_char_next, /* unicodes_char_next */
(PS_Macintosh_NameFunc) ps_get_macintosh_name, /* macintosh_name */
(PS_Adobe_Std_StringsFunc) ps_get_standard_strings, /* adobe_std_strings */
t1_standard_encoding, /* adobe_std_encoding */
t1_expert_encoding /* adobe_expert_encoding */
)
#else
FT_DEFINE_SERVICE_PSCMAPSREC(
pscmaps_interface,
NULL, /* unicode_value */
NULL, /* unicodes_init */
NULL, /* unicodes_char_index */
NULL, /* unicodes_char_next */
(PS_Macintosh_NameFunc) ps_get_macintosh_name, /* macintosh_name */
(PS_Adobe_Std_StringsFunc) ps_get_standard_strings, /* adobe_std_strings */
t1_standard_encoding, /* adobe_std_encoding */
t1_expert_encoding /* adobe_expert_encoding */
)
#endif /* FT_CONFIG_OPTION_ADOBE_GLYPH_LIST */
FT_DEFINE_SERVICEDESCREC1(
pscmaps_services,
FT_SERVICE_ID_POSTSCRIPT_CMAPS, &pscmaps_interface )
static FT_Pointer
psnames_get_service( FT_Module module,
const char* service_id )
{
FT_UNUSED( module );
return ft_service_list_lookup( pscmaps_services, service_id );
}
#endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
#ifndef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
#define PUT_PS_NAMES_SERVICE( a ) NULL
#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*)&pscmaps_interface ), /* module specific interface */
(FT_Module_Constructor)NULL, /* module_init */
(FT_Module_Destructor) NULL, /* module_done */
(FT_Module_Requester) PUT_PS_NAMES_SERVICE( psnames_get_service ) /* get_interface */
)
/* END */