ref: cb4a943bc4d24d48eeb5d1515c5acd880c4a82ab
dir: /src/sfnt/sfdriver.c/
/****************************************************************************
*
* sfdriver.c
*
* High-level SFNT driver interface (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 <freetype/internal/ftdebug.h>
#include <freetype/internal/sfnt.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/ttnameid.h>
#include "sfdriver.h"
#include "ttload.h"
#include "sfobjs.h"
#include "sferrors.h"
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
#include "ttsbit.h"
#endif
#ifdef TT_CONFIG_OPTION_COLOR_LAYERS
#include "ttcolr.h"
#include "ttcpal.h"
#endif
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
#include "ttpost.h"
#endif
#ifdef TT_CONFIG_OPTION_BDF
#include "ttbdf.h"
#include <freetype/internal/services/svbdf.h>
#endif
#include "ttcmap.h"
#include "ttkern.h"
#include "ttmtx.h"
#include <freetype/internal/services/svgldict.h>
#include <freetype/internal/services/svpostnm.h>
#include <freetype/internal/services/svsfnt.h>
#include <freetype/internal/services/svttcmap.h>
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include <freetype/ftmm.h>
#include <freetype/internal/services/svmm.h>
#endif
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT sfdriver
/*
* SFNT TABLE SERVICE
*
*/
static void*
get_sfnt_table( TT_Face face,
FT_Sfnt_Tag tag )
{
void* table;
switch ( tag )
{
case FT_SFNT_HEAD:
table = &face->header;
break;
case FT_SFNT_HHEA:
table = &face->horizontal;
break;
case FT_SFNT_VHEA:
table = face->vertical_info ? &face->vertical : NULL;
break;
case FT_SFNT_OS2:
table = ( face->os2.version == 0xFFFFU ) ? NULL : &face->os2;
break;
case FT_SFNT_POST:
table = &face->postscript;
break;
case FT_SFNT_MAXP:
table = &face->max_profile;
break;
case FT_SFNT_PCLT:
table = face->pclt.Version ? &face->pclt : NULL;
break;
default:
table = NULL;
}
return table;
}
static FT_Error
sfnt_table_info( TT_Face face,
FT_UInt idx,
FT_ULong *tag,
FT_ULong *offset,
FT_ULong *length )
{
if ( !offset || !length )
return FT_THROW( Invalid_Argument );
if ( !tag )
*length = face->num_tables;
else
{
if ( idx >= face->num_tables )
return FT_THROW( Table_Missing );
*tag = face->dir_tables[idx].Tag;
*offset = face->dir_tables[idx].Offset;
*length = face->dir_tables[idx].Length;
}
return FT_Err_Ok;
}
FT_DEFINE_SERVICE_SFNT_TABLEREC(
sfnt_service_sfnt_table,
(FT_SFNT_TableLoadFunc)tt_face_load_any, /* load_table */
(FT_SFNT_TableGetFunc) get_sfnt_table, /* get_table */
(FT_SFNT_TableInfoFunc)sfnt_table_info /* table_info */
)
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
/*
* GLYPH DICT SERVICE
*
*/
static FT_Error
sfnt_get_glyph_name( FT_Face face,
FT_UInt glyph_index,
FT_Pointer buffer,
FT_UInt buffer_max )
{
FT_String* gname;
FT_Error error;
error = tt_face_get_ps_name( (TT_Face)face, glyph_index, &gname );
if ( !error )
FT_STRCPYN( buffer, gname, buffer_max );
return error;
}
static FT_UInt
sfnt_get_name_index( FT_Face face,
const FT_String* glyph_name )
{
TT_Face ttface = (TT_Face)face;
FT_UInt i, max_gid = FT_UINT_MAX;
if ( face->num_glyphs < 0 )
return 0;
else if ( (FT_ULong)face->num_glyphs < FT_UINT_MAX )
max_gid = (FT_UInt)face->num_glyphs;
else
FT_TRACE0(( "Ignore glyph names for invalid GID 0x%08x - 0x%08x\n",
FT_UINT_MAX, face->num_glyphs ));
for ( i = 0; i < max_gid; i++ )
{
FT_String* gname;
FT_Error error = tt_face_get_ps_name( ttface, i, &gname );
if ( error )
continue;
if ( !ft_strcmp( glyph_name, gname ) )
return i;
}
return 0;
}
FT_DEFINE_SERVICE_GLYPHDICTREC(
sfnt_service_glyph_dict,
(FT_GlyphDict_GetNameFunc) sfnt_get_glyph_name, /* get_name */
(FT_GlyphDict_NameIndexFunc)sfnt_get_name_index /* name_index */
)
#endif /* TT_CONFIG_OPTION_POSTSCRIPT_NAMES */
/*
* POSTSCRIPT NAME SERVICE
*
*/
/* an array representing allowed ASCII characters in a PS string */
static const unsigned char sfnt_ps_map[16] =
{
/* 4 0 C 8 */
0x00, 0x00, /* 0x00: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 */
0x00, 0x00, /* 0x10: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 */
0xDE, 0x7C, /* 0x20: 1 1 0 1 1 1 1 0 0 1 1 1 1 1 0 0 */
0xFF, 0xAF, /* 0x30: 1 1 1 1 1 1 1 1 1 0 1 0 1 1 1 1 */
0xFF, 0xFF, /* 0x40: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 */
0xFF, 0xD7, /* 0x50: 1 1 1 1 1 1 1 1 1 1 0 1 0 1 1 1 */
0xFF, 0xFF, /* 0x60: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 */
0xFF, 0x57 /* 0x70: 1 1 1 1 1 1 1 1 0 1 0 1 0 1 1 1 */
};
static int
sfnt_is_postscript( int c )
{
unsigned int cc;
if ( c < 0 || c >= 0x80 )
return 0;
cc = (unsigned int)c;
return sfnt_ps_map[cc >> 3] & ( 1 << ( cc & 0x07 ) );
}
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
/* Only ASCII letters and digits are taken for a variation font */
/* instance's PostScript name. */
/* */
/* `ft_isalnum' is a macro, but we need a function here, thus */
/* this definition. */
static int
sfnt_is_alphanumeric( int c )
{
return ft_isalnum( c );
}
/* the implementation of MurmurHash3 is taken and adapted from */
/* https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp */
#define ROTL32( x, r ) ( x << r ) | ( x >> ( 32 - r ) )
static FT_UInt32
fmix32( FT_UInt32 h )
{
h ^= h >> 16;
h *= 0x85ebca6b;
h ^= h >> 13;
h *= 0xc2b2ae35;
h ^= h >> 16;
return h;
}
static void
murmur_hash_3_128( const void* key,
const unsigned int len,
FT_UInt32 seed,
void* out )
{
const FT_Byte* data = (const FT_Byte*)key;
const int nblocks = (int)len / 16;
FT_UInt32 h1 = seed;
FT_UInt32 h2 = seed;
FT_UInt32 h3 = seed;
FT_UInt32 h4 = seed;
const FT_UInt32 c1 = 0x239b961b;
const FT_UInt32 c2 = 0xab0e9789;
const FT_UInt32 c3 = 0x38b34ae5;
const FT_UInt32 c4 = 0xa1e38b93;
const FT_UInt32* blocks = (const FT_UInt32*)( data + nblocks * 16 );
int i;
for( i = -nblocks; i; i++ )
{
FT_UInt32 k1 = blocks[i * 4 + 0];
FT_UInt32 k2 = blocks[i * 4 + 1];
FT_UInt32 k3 = blocks[i * 4 + 2];
FT_UInt32 k4 = blocks[i * 4 + 3];
k1 *= c1;
k1 = ROTL32( k1, 15 );
k1 *= c2;
h1 ^= k1;
h1 = ROTL32( h1, 19 );
h1 += h2;
h1 = h1 * 5 + 0x561ccd1b;
k2 *= c2;
k2 = ROTL32( k2, 16 );
k2 *= c3;
h2 ^= k2;
h2 = ROTL32( h2, 17 );
h2 += h3;
h2 = h2 * 5 + 0x0bcaa747;
k3 *= c3;
k3 = ROTL32( k3, 17 );
k3 *= c4;
h3 ^= k3;
h3 = ROTL32( h3, 15 );
h3 += h4;
h3 = h3 * 5 + 0x96cd1c35;
k4 *= c4;
k4 = ROTL32( k4, 18 );
k4 *= c1;
h4 ^= k4;
h4 = ROTL32( h4, 13 );
h4 += h1;
h4 = h4 * 5 + 0x32ac3b17;
}
{
const FT_Byte* tail = (const FT_Byte*)( data + nblocks * 16 );
FT_UInt32 k1 = 0;
FT_UInt32 k2 = 0;
FT_UInt32 k3 = 0;
FT_UInt32 k4 = 0;
switch ( len & 15 )
{
case 15:
k4 ^= (FT_UInt32)tail[14] << 16;
/* fall through */
case 14:
k4 ^= (FT_UInt32)tail[13] << 8;
/* fall through */
case 13:
k4 ^= (FT_UInt32)tail[12];
k4 *= c4;
k4 = ROTL32( k4, 18 );
k4 *= c1;
h4 ^= k4;
/* fall through */
case 12:
k3 ^= (FT_UInt32)tail[11] << 24;
/* fall through */
case 11:
k3 ^= (FT_UInt32)tail[10] << 16;
/* fall through */
case 10:
k3 ^= (FT_UInt32)tail[9] << 8;
/* fall through */
case 9:
k3 ^= (FT_UInt32)tail[8];
k3 *= c3;
k3 = ROTL32( k3, 17 );
k3 *= c4;
h3 ^= k3;
/* fall through */
case 8:
k2 ^= (FT_UInt32)tail[7] << 24;
/* fall through */
case 7:
k2 ^= (FT_UInt32)tail[6] << 16;
/* fall through */
case 6:
k2 ^= (FT_UInt32)tail[5] << 8;
/* fall through */
case 5:
k2 ^= (FT_UInt32)tail[4];
k2 *= c2;
k2 = ROTL32( k2, 16 );
k2 *= c3;
h2 ^= k2;
/* fall through */
case 4:
k1 ^= (FT_UInt32)tail[3] << 24;
/* fall through */
case 3:
k1 ^= (FT_UInt32)tail[2] << 16;
/* fall through */
case 2:
k1 ^= (FT_UInt32)tail[1] << 8;
/* fall through */
case 1:
k1 ^= (FT_UInt32)tail[0];
k1 *= c1;
k1 = ROTL32( k1, 15 );
k1 *= c2;
h1 ^= k1;
}
}
h1 ^= len;
h2 ^= len;
h3 ^= len;
h4 ^= len;
h1 += h2;
h1 += h3;
h1 += h4;
h2 += h1;
h3 += h1;
h4 += h1;
h1 = fmix32( h1 );
h2 = fmix32( h2 );
h3 = fmix32( h3 );
h4 = fmix32( h4 );
h1 += h2;
h1 += h3;
h1 += h4;
h2 += h1;
h3 += h1;
h4 += h1;
((FT_UInt32*)out)[0] = h1;
((FT_UInt32*)out)[1] = h2;
((FT_UInt32*)out)[2] = h3;
((FT_UInt32*)out)[3] = h4;
}
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
typedef int (*char_type_func)( int c );
/* Handling of PID/EID 3/0 and 3/1 is the same. */
#define IS_WIN( n ) ( (n)->platformID == 3 && \
( (n)->encodingID == 1 || (n)->encodingID == 0 ) )
#define IS_APPLE( n ) ( (n)->platformID == 1 && \
(n)->encodingID == 0 )
static char*
get_win_string( FT_Memory memory,
FT_Stream stream,
TT_Name entry,
char_type_func char_type,
FT_Bool report_invalid_characters )
{
FT_Error error = FT_Err_Ok;
char* result = NULL;
FT_String* r;
FT_Char* p;
FT_UInt len;
FT_UNUSED( error );
if ( FT_ALLOC( result, entry->stringLength / 2 + 1 ) )
return NULL;
if ( FT_STREAM_SEEK( entry->stringOffset ) ||
FT_FRAME_ENTER( entry->stringLength ) )
goto get_win_string_error;
r = (FT_String*)result;
p = (FT_Char*)stream->cursor;
for ( len = entry->stringLength / 2; len > 0; len--, p += 2 )
{
if ( p[0] == 0 && char_type( p[1] ) )
*r++ = p[1];
else
{
if ( report_invalid_characters )
FT_TRACE0(( "get_win_string:"
" Character 0x%X invalid in PS name string\n",
((unsigned)p[0])*256 + (unsigned)p[1] ));
break;
}
}
if ( !len )
*r = '\0';
FT_FRAME_EXIT();
if ( !len )
return result;
get_win_string_error:
FT_FREE( result );
entry->stringLength = 0;
entry->stringOffset = 0;
FT_FREE( entry->string );
return NULL;
}
static char*
get_apple_string( FT_Memory memory,
FT_Stream stream,
TT_Name entry,
char_type_func char_type,
FT_Bool report_invalid_characters )
{
FT_Error error = FT_Err_Ok;
char* result = NULL;
FT_String* r;
FT_Char* p;
FT_UInt len;
FT_UNUSED( error );
if ( FT_ALLOC( result, entry->stringLength + 1 ) )
return NULL;
if ( FT_STREAM_SEEK( entry->stringOffset ) ||
FT_FRAME_ENTER( entry->stringLength ) )
goto get_apple_string_error;
r = (FT_String*)result;
p = (FT_Char*)stream->cursor;
for ( len = entry->stringLength; len > 0; len--, p++ )
{
if ( char_type( *p ) )
*r++ = *p;
else
{
if ( report_invalid_characters )
FT_TRACE0(( "get_apple_string:"
" Character `%c' (0x%X) invalid in PS name string\n",
*p, *p ));
break;
}
}
if ( !len )
*r = '\0';
FT_FRAME_EXIT();
if ( !len )
return result;
get_apple_string_error:
FT_FREE( result );
entry->stringOffset = 0;
entry->stringLength = 0;
FT_FREE( entry->string );
return NULL;
}
static FT_Bool
sfnt_get_name_id( TT_Face face,
FT_UShort id,
FT_Int *win,
FT_Int *apple )
{
FT_Int n;
*win = -1;
*apple = -1;
for ( n = 0; n < face->num_names; n++ )
{
TT_Name name = face->name_table.names + n;
if ( name->nameID == id && name->stringLength > 0 )
{
if ( IS_WIN( name ) && ( name->languageID == 0x409 || *win == -1 ) )
*win = n;
if ( IS_APPLE( name ) && ( name->languageID == 0 || *apple == -1 ) )
*apple = n;
}
}
return ( *win >= 0 ) || ( *apple >= 0 );
}
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
/*
The maximum length of an axis value descriptor.
We need 65536 different values for the decimal fraction; this fits
nicely into five decimal places. Consequently, it consists of
. the minus sign if the number is negative,
. up to five characters for the digits before the decimal point,
. the decimal point if there is a fractional part, and
. up to five characters for the digits after the decimal point.
We also need one byte for the leading `_' character and up to four
bytes for the axis tag.
*/
#define MAX_VALUE_DESCRIPTOR_LEN ( 1 + 5 + 1 + 5 + 1 + 4 )
/* the maximum length of PostScript font names */
#define MAX_PS_NAME_LEN 127
/*
* Find the shortest decimal representation of a 16.16 fixed point
* number. The function fills `buf' with the result, returning a pointer
* to the position after the representation's last byte.
*/
static char*
fixed2float( FT_Int fixed,
char* buf )
{
char* p;
char* q;
char tmp[5];
FT_Int int_part;
FT_Int frac_part;
FT_Int i;
p = buf;
if ( fixed == 0 )
{
*p++ = '0';
return p;
}
if ( fixed < 0 )
{
*p++ = '-';
fixed = NEG_INT( fixed );
}
int_part = ( fixed >> 16 ) & 0xFFFF;
frac_part = fixed & 0xFFFF;
/* get digits of integer part (in reverse order) */
q = tmp;
while ( int_part > 0 )
{
*q++ = '0' + int_part % 10;
int_part /= 10;
}
/* copy digits in correct order to buffer */
while ( q > tmp )
*p++ = *--q;
if ( !frac_part )
return p;
/* save position of point */
q = p;
*p++ = '.';
/* apply rounding */
frac_part = frac_part * 10 + 5;
/* get digits of fractional part */
for ( i = 0; i < 5; i++ )
{
*p++ = '0' + (char)( frac_part / 0x10000L );
frac_part %= 0x10000L;
if ( !frac_part )
break;
frac_part *= 10;
}
/*
If the remainder stored in `frac_part' (after the last FOR loop) is
smaller than 34480*10, the resulting decimal value minus 0.00001 is
an equivalent representation of `fixed'.
The above FOR loop always finds the larger of the two values; I
verified this by iterating over all possible fixed point numbers.
If the remainder is 17232*10, both values are equally good, and we
take the next even number (following IEEE 754's `round to nearest,
ties to even' rounding rule).
If the remainder is smaller than 17232*10, the lower of the two
numbers is nearer to the exact result (values 17232 and 34480 were
also found by testing all possible fixed point values).
We use this to find a shorter decimal representation. If not ending
with digit zero, we take the representation with less error.
*/
p--;
if ( p - q == 5 ) /* five digits? */
{
/* take the representation that has zero as the last digit */
if ( frac_part < 34480 * 10 &&
*p == '1' )
*p = '0';
/* otherwise use the one with less error */
else if ( frac_part == 17232 * 10 &&
*p & 1 )
*p -= 1;
else if ( frac_part < 17232 * 10 &&
*p != '0' )
*p -= 1;
}
/* remove trailing zeros */
while ( *p == '0' )
*p-- = '\0';
return p + 1;
}
static const char hexdigits[16] =
{
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
static const char*
sfnt_get_var_ps_name( TT_Face face )
{
FT_Error error;
FT_Memory memory = face->root.memory;
FT_Service_MultiMasters mm = (FT_Service_MultiMasters)face->mm;
FT_UInt num_coords;
FT_Fixed* coords;
FT_MM_Var* mm_var;
FT_Int found, win, apple;
FT_UInt i, j;
char* result = NULL;
char* p;
if ( !face->var_postscript_prefix )
{
FT_UInt len;
/* check whether we have a Variations PostScript Name Prefix */
found = sfnt_get_name_id( face,
TT_NAME_ID_VARIATIONS_PREFIX,
&win,
&apple );
if ( !found )
{
/* otherwise use the typographic family name */
found = sfnt_get_name_id( face,
TT_NAME_ID_TYPOGRAPHIC_FAMILY,
&win,
&apple );
}
if ( !found )
{
/* as a last resort we try the family name; note that this is */
/* not in the Adobe TechNote, but GX fonts (which predate the */
/* TechNote) benefit from this behaviour */
found = sfnt_get_name_id( face,
TT_NAME_ID_FONT_FAMILY,
&win,
&apple );
}
if ( !found )
{
FT_TRACE0(( "sfnt_get_var_ps_name:"
" Can't construct PS name prefix for font instances\n" ));
return NULL;
}
/* prefer Windows entries over Apple */
if ( win != -1 )
result = get_win_string( face->root.memory,
face->name_table.stream,
face->name_table.names + win,
sfnt_is_alphanumeric,
0 );
if ( !result && apple != -1 )
result = get_apple_string( face->root.memory,
face->name_table.stream,
face->name_table.names + apple,
sfnt_is_alphanumeric,
0 );
if ( !result )
{
FT_TRACE0(( "sfnt_get_var_ps_name:"
" No valid PS name prefix for font instances found\n" ));
return NULL;
}
len = ft_strlen( result );
/* sanitize if necessary; we reserve space for 36 bytes (a 128bit */
/* checksum as a hex number, preceded by `-' and followed by three */
/* ASCII dots, to be used if the constructed PS name would be too */
/* long); this is also sufficient for a single instance */
if ( len > MAX_PS_NAME_LEN - ( 1 + 32 + 3 ) )
{
len = MAX_PS_NAME_LEN - ( 1 + 32 + 3 );
result[len] = '\0';
FT_TRACE0(( "sfnt_get_var_ps_name:"
" Shortening variation PS name prefix\n"
" "
" to %d characters\n", len ));
}
face->var_postscript_prefix = result;
face->var_postscript_prefix_len = len;
}
mm->get_var_blend( FT_FACE( face ),
&num_coords,
&coords,
NULL,
&mm_var );
if ( FT_IS_NAMED_INSTANCE( FT_FACE( face ) ) &&
!FT_IS_VARIATION( FT_FACE( face ) ) )
{
SFNT_Service sfnt = (SFNT_Service)face->sfnt;
FT_Long instance = ( ( face->root.face_index & 0x7FFF0000L ) >> 16 ) - 1;
FT_UInt psid = mm_var->namedstyle[instance].psid;
char* ps_name = NULL;
/* try first to load the name string with index `postScriptNameID' */
if ( psid == 6 ||
( psid > 255 && psid < 32768 ) )
(void)sfnt->get_name( face, (FT_UShort)psid, &ps_name );
if ( ps_name )
{
result = ps_name;
p = result + ft_strlen( result ) + 1;
goto check_length;
}
else
{
/* otherwise construct a name using `subfamilyNameID' */
FT_UInt strid = mm_var->namedstyle[instance].strid;
char* subfamily_name;
char* s;
(void)sfnt->get_name( face, (FT_UShort)strid, &subfamily_name );
if ( !subfamily_name )
{
FT_TRACE1(( "sfnt_get_var_ps_name:"
" can't construct named instance PS name;\n"
" "
" trying to construct normal instance PS name\n" ));
goto construct_instance_name;
}
/* after the prefix we have character `-' followed by the */
/* subfamily name (using only characters a-z, A-Z, and 0-9) */
if ( FT_ALLOC( result, face->var_postscript_prefix_len +
1 + ft_strlen( subfamily_name ) + 1 ) )
return NULL;
ft_strcpy( result, face->var_postscript_prefix );
p = result + face->var_postscript_prefix_len;
*p++ = '-';
s = subfamily_name;
while ( *s )
{
if ( ft_isalnum( *s ) )
*p++ = *s;
s++;
}
*p++ = '\0';
FT_FREE( subfamily_name );
}
}
else
{
FT_Var_Axis* axis;
construct_instance_name:
axis = mm_var->axis;
if ( FT_ALLOC( result,
face->var_postscript_prefix_len +
num_coords * MAX_VALUE_DESCRIPTOR_LEN + 1 ) )
return NULL;
p = result;
ft_strcpy( p, face->var_postscript_prefix );
p += face->var_postscript_prefix_len;
for ( i = 0; i < num_coords; i++, coords++, axis++ )
{
char t;
/* omit axis value descriptor if it is identical */
/* to the default axis value */
if ( *coords == axis->def )
continue;
*p++ = '_';
p = fixed2float( *coords, p );
t = (char)( axis->tag >> 24 );
if ( t != ' ' && ft_isalnum( t ) )
*p++ = t;
t = (char)( axis->tag >> 16 );
if ( t != ' ' && ft_isalnum( t ) )
*p++ = t;
t = (char)( axis->tag >> 8 );
if ( t != ' ' && ft_isalnum( t ) )
*p++ = t;
t = (char)axis->tag;
if ( t != ' ' && ft_isalnum( t ) )
*p++ = t;
}
}
check_length:
if ( p - result > MAX_PS_NAME_LEN )
{
/* the PS name is too long; replace the part after the prefix with */
/* a checksum; we use MurmurHash 3 with a hash length of 128 bit */
FT_UInt32 seed = 123456789;
FT_UInt32 hash[4];
FT_UInt32* h;
murmur_hash_3_128( result, p - result, seed, hash );
p = result + face->var_postscript_prefix_len;
*p++ = '-';
/* we convert the hash value to hex digits from back to front */
p += 32 + 3;
h = hash + 3;
*p-- = '\0';
*p-- = '.';
*p-- = '.';
*p-- = '.';
for ( i = 0; i < 4; i++, h-- )
{
FT_UInt32 v = *h;
for ( j = 0; j < 8; j++ )
{
*p-- = hexdigits[v & 0xF];
v >>= 4;
}
}
}
return result;
}
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
static const char*
sfnt_get_ps_name( TT_Face face )
{
FT_Int found, win, apple;
const char* result = NULL;
if ( face->postscript_name )
return face->postscript_name;
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
if ( face->blend &&
( FT_IS_NAMED_INSTANCE( FT_FACE( face ) ) ||
FT_IS_VARIATION( FT_FACE( face ) ) ) )
{
face->postscript_name = sfnt_get_var_ps_name( face );
return face->postscript_name;
}
#endif
/* scan the name table to see whether we have a Postscript name here, */
/* either in Macintosh or Windows platform encodings */
found = sfnt_get_name_id( face, TT_NAME_ID_PS_NAME, &win, &apple );
if ( !found )
return NULL;
/* prefer Windows entries over Apple */
if ( win != -1 )
result = get_win_string( face->root.memory,
face->name_table.stream,
face->name_table.names + win,
sfnt_is_postscript,
1 );
if ( !result && apple != -1 )
result = get_apple_string( face->root.memory,
face->name_table.stream,
face->name_table.names + apple,
sfnt_is_postscript,
1 );
face->postscript_name = result;
return result;
}
FT_DEFINE_SERVICE_PSFONTNAMEREC(
sfnt_service_ps_name,
(FT_PsName_GetFunc)sfnt_get_ps_name /* get_ps_font_name */
)
/*
* TT CMAP INFO
*/
FT_DEFINE_SERVICE_TTCMAPSREC(
tt_service_get_cmap_info,
(TT_CMap_Info_GetFunc)tt_get_cmap_info /* get_cmap_info */
)
#ifdef TT_CONFIG_OPTION_BDF
static FT_Error
sfnt_get_charset_id( TT_Face face,
const char* *acharset_encoding,
const char* *acharset_registry )
{
BDF_PropertyRec encoding, registry;
FT_Error error;
/* XXX: I don't know whether this is correct, since
* tt_face_find_bdf_prop only returns something correct if we have
* previously selected a size that is listed in the BDF table.
* Should we change the BDF table format to include single offsets
* for `CHARSET_REGISTRY' and `CHARSET_ENCODING'?
*/
error = tt_face_find_bdf_prop( face, "CHARSET_REGISTRY", ®istry );
if ( !error )
{
error = tt_face_find_bdf_prop( face, "CHARSET_ENCODING", &encoding );
if ( !error )
{
if ( registry.type == BDF_PROPERTY_TYPE_ATOM &&
encoding.type == BDF_PROPERTY_TYPE_ATOM )
{
*acharset_encoding = encoding.u.atom;
*acharset_registry = registry.u.atom;
}
else
error = FT_THROW( Invalid_Argument );
}
}
return error;
}
FT_DEFINE_SERVICE_BDFRec(
sfnt_service_bdf,
(FT_BDF_GetCharsetIdFunc)sfnt_get_charset_id, /* get_charset_id */
(FT_BDF_GetPropertyFunc) tt_face_find_bdf_prop /* get_property */
)
#endif /* TT_CONFIG_OPTION_BDF */
/*
* SERVICE LIST
*/
#if defined TT_CONFIG_OPTION_POSTSCRIPT_NAMES && defined TT_CONFIG_OPTION_BDF
FT_DEFINE_SERVICEDESCREC5(
sfnt_services,
FT_SERVICE_ID_SFNT_TABLE, &sfnt_service_sfnt_table,
FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &sfnt_service_ps_name,
FT_SERVICE_ID_GLYPH_DICT, &sfnt_service_glyph_dict,
FT_SERVICE_ID_BDF, &sfnt_service_bdf,
FT_SERVICE_ID_TT_CMAP, &tt_service_get_cmap_info )
#elif defined TT_CONFIG_OPTION_POSTSCRIPT_NAMES
FT_DEFINE_SERVICEDESCREC4(
sfnt_services,
FT_SERVICE_ID_SFNT_TABLE, &sfnt_service_sfnt_table,
FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &sfnt_service_ps_name,
FT_SERVICE_ID_GLYPH_DICT, &sfnt_service_glyph_dict,
FT_SERVICE_ID_TT_CMAP, &tt_service_get_cmap_info )
#elif defined TT_CONFIG_OPTION_BDF
FT_DEFINE_SERVICEDESCREC4(
sfnt_services,
FT_SERVICE_ID_SFNT_TABLE, &sfnt_service_sfnt_table,
FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &sfnt_service_ps_name,
FT_SERVICE_ID_BDF, &sfnt_service_bdf,
FT_SERVICE_ID_TT_CMAP, &tt_service_get_cmap_info )
#else
FT_DEFINE_SERVICEDESCREC3(
sfnt_services,
FT_SERVICE_ID_SFNT_TABLE, &sfnt_service_sfnt_table,
FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &sfnt_service_ps_name,
FT_SERVICE_ID_TT_CMAP, &tt_service_get_cmap_info )
#endif
FT_CALLBACK_DEF( FT_Module_Interface )
sfnt_get_interface( FT_Module module,
const char* module_interface )
{
FT_UNUSED( module );
return ft_service_list_lookup( sfnt_services, module_interface );
}
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
#define PUT_EMBEDDED_BITMAPS( a ) a
#else
#define PUT_EMBEDDED_BITMAPS( a ) NULL
#endif
#ifdef TT_CONFIG_OPTION_COLOR_LAYERS
#define PUT_COLOR_LAYERS( a ) a
#else
#define PUT_COLOR_LAYERS( a ) NULL
#endif
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
#define PUT_PS_NAMES( a ) a
#else
#define PUT_PS_NAMES( a ) NULL
#endif
FT_DEFINE_SFNT_INTERFACE(
sfnt_interface,
tt_face_goto_table, /* TT_Loader_GotoTableFunc goto_table */
sfnt_init_face, /* TT_Init_Face_Func init_face */
sfnt_load_face, /* TT_Load_Face_Func load_face */
sfnt_done_face, /* TT_Done_Face_Func done_face */
sfnt_get_interface, /* FT_Module_Requester get_interface */
tt_face_load_any, /* TT_Load_Any_Func load_any */
tt_face_load_head, /* TT_Load_Table_Func load_head */
tt_face_load_hhea, /* TT_Load_Metrics_Func load_hhea */
tt_face_load_cmap, /* TT_Load_Table_Func load_cmap */
tt_face_load_maxp, /* TT_Load_Table_Func load_maxp */
tt_face_load_os2, /* TT_Load_Table_Func load_os2 */
tt_face_load_post, /* TT_Load_Table_Func load_post */
tt_face_load_name, /* TT_Load_Table_Func load_name */
tt_face_free_name, /* TT_Free_Table_Func free_name */
tt_face_load_kern, /* TT_Load_Table_Func load_kern */
tt_face_load_gasp, /* TT_Load_Table_Func load_gasp */
tt_face_load_pclt, /* TT_Load_Table_Func load_init */
/* see `ttload.h' */
PUT_EMBEDDED_BITMAPS( tt_face_load_bhed ),
/* TT_Load_Table_Func load_bhed */
PUT_EMBEDDED_BITMAPS( tt_face_load_sbit_image ),
/* TT_Load_SBit_Image_Func load_sbit_image */
/* see `ttpost.h' */
PUT_PS_NAMES( tt_face_get_ps_name ),
/* TT_Get_PS_Name_Func get_psname */
PUT_PS_NAMES( tt_face_free_ps_names ),
/* TT_Free_Table_Func free_psnames */
/* since version 2.1.8 */
tt_face_get_kerning, /* TT_Face_GetKerningFunc get_kerning */
/* since version 2.2 */
tt_face_load_font_dir, /* TT_Load_Table_Func load_font_dir */
tt_face_load_hmtx, /* TT_Load_Metrics_Func load_hmtx */
/* see `ttsbit.h' and `sfnt.h' */
PUT_EMBEDDED_BITMAPS( tt_face_load_sbit ),
/* TT_Load_Table_Func load_eblc */
PUT_EMBEDDED_BITMAPS( tt_face_free_sbit ),
/* TT_Free_Table_Func free_eblc */
PUT_EMBEDDED_BITMAPS( tt_face_set_sbit_strike ),
/* TT_Set_SBit_Strike_Func set_sbit_strike */
PUT_EMBEDDED_BITMAPS( tt_face_load_strike_metrics ),
/* TT_Load_Strike_Metrics_Func load_strike_metrics */
PUT_COLOR_LAYERS( tt_face_load_cpal ),
/* TT_Load_Table_Func load_cpal */
PUT_COLOR_LAYERS( tt_face_load_colr ),
/* TT_Load_Table_Func load_colr */
PUT_COLOR_LAYERS( tt_face_free_cpal ),
/* TT_Free_Table_Func free_cpal */
PUT_COLOR_LAYERS( tt_face_free_colr ),
/* TT_Free_Table_Func free_colr */
PUT_COLOR_LAYERS( tt_face_palette_set ),
/* TT_Set_Palette_Func set_palette */
PUT_COLOR_LAYERS( tt_face_get_colr_layer ),
/* TT_Get_Colr_Layer_Func get_colr_layer */
PUT_COLOR_LAYERS( tt_face_colr_blend_layer ),
/* TT_Blend_Colr_Func colr_blend */
tt_face_get_metrics, /* TT_Get_Metrics_Func get_metrics */
tt_face_get_name, /* TT_Get_Name_Func get_name */
sfnt_get_name_id /* TT_Get_Name_ID_Func get_name_id */
)
FT_DEFINE_MODULE(
sfnt_module_class,
0, /* not a font driver or renderer */
sizeof ( FT_ModuleRec ),
"sfnt", /* driver name */
0x10000L, /* driver version 1.0 */
0x20000L, /* driver requires FreeType 2.0 or higher */
(const void*)&sfnt_interface, /* module specific interface */
(FT_Module_Constructor)NULL, /* module_init */
(FT_Module_Destructor) NULL, /* module_done */
(FT_Module_Requester) sfnt_get_interface /* get_interface */
)
/* END */