ref: 644b1ad49e2da9662aa8d4d263896c9508c58ee0
dir: /src/sfnt/sfdriver.c/
/***************************************************************************/
/* */
/* sfdriver.c */
/* */
/* High-level SFNT driver interface (body). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 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_SFNT_H
#include FT_INTERNAL_OBJECTS_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_POSTSCRIPT_NAMES
#include "ttpost.h"
#endif
#ifdef TT_CONFIG_OPTION_BDF
#include "ttbdf.h"
#include FT_SERVICE_BDF_H
#endif
#include "ttcmap.h"
#include "ttkern.h"
#include "ttmtx.h"
#include FT_SERVICE_GLYPH_DICT_H
#include FT_SERVICE_POSTSCRIPT_NAME_H
#include FT_SERVICE_SFNT_H
#include FT_SERVICE_TT_CMAP_H
/*
* 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 : 0;
break;
case ft_sfnt_os2:
table = face->os2.version == 0xFFFFU ? 0 : &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 : 0;
break;
default:
table = 0;
}
return table;
}
static FT_Error
sfnt_table_info( TT_Face face,
FT_UInt idx,
FT_ULong *tag,
FT_ULong *length )
{
if ( !tag || !length )
return SFNT_Err_Invalid_Argument;
if ( idx >= face->num_tables )
return SFNT_Err_Table_Missing;
*tag = face->dir_tables[idx].Tag;
*length = face->dir_tables[idx].Length;
return SFNT_Err_Ok;
}
static const FT_Service_SFNT_TableRec sfnt_service_sfnt_table =
{
(FT_SFNT_TableLoadFunc)tt_face_load_any,
(FT_SFNT_TableGetFunc) get_sfnt_table,
(FT_SFNT_TableInfoFunc)sfnt_table_info
};
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
/*
* GLYPH DICT SERVICE
*
*/
static FT_Error
sfnt_get_glyph_name( TT_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( face, glyph_index, &gname );
if ( !error )
FT_STRCPYN( buffer, gname, buffer_max );
return error;
}
static const FT_Service_GlyphDictRec sfnt_service_glyph_dict =
{
(FT_GlyphDict_GetNameFunc) sfnt_get_glyph_name,
(FT_GlyphDict_NameIndexFunc)NULL
};
#endif /* TT_CONFIG_OPTION_POSTSCRIPT_NAMES */
/*
* POSTSCRIPT NAME SERVICE
*
*/
static const char*
sfnt_get_ps_name( TT_Face face )
{
FT_Int n, found_win, found_apple;
const char* result = NULL;
/* shouldn't happen, but just in case to avoid memory leaks */
if ( face->postscript_name )
return face->postscript_name;
/* scan the name table to see whether we have a Postscript name here, */
/* either in Macintosh or Windows platform encodings */
found_win = -1;
found_apple = -1;
for ( n = 0; n < face->num_names; n++ )
{
TT_NameEntryRec* name = face->name_table.names + n;
if ( name->nameID == 6 && name->stringLength > 0 )
{
if ( name->platformID == 3 &&
name->encodingID == 1 &&
name->languageID == 0x409 )
found_win = n;
if ( name->platformID == 1 &&
name->encodingID == 0 &&
name->languageID == 0 )
found_apple = n;
}
}
if ( found_win != -1 )
{
FT_Memory memory = face->root.memory;
TT_NameEntryRec* name = face->name_table.names + found_win;
FT_UInt len = name->stringLength / 2;
FT_Error error = SFNT_Err_Ok;
FT_UNUSED( error );
if ( !FT_ALLOC( result, name->stringLength + 1 ) )
{
FT_Stream stream = face->name_table.stream;
FT_String* r = (FT_String*)result;
FT_Byte* p = (FT_Byte*)name->string;
if ( FT_STREAM_SEEK( name->stringOffset ) ||
FT_FRAME_ENTER( name->stringLength ) )
{
FT_FREE( result );
name->stringLength = 0;
name->stringOffset = 0;
FT_FREE( name->string );
goto Exit;
}
p = (FT_Byte*)stream->cursor;
for ( ; len > 0; len--, p += 2 )
{
if ( p[0] == 0 && p[1] >= 32 && p[1] < 128 )
*r++ = p[1];
}
*r = '\0';
FT_FRAME_EXIT();
}
goto Exit;
}
if ( found_apple != -1 )
{
FT_Memory memory = face->root.memory;
TT_NameEntryRec* name = face->name_table.names + found_apple;
FT_UInt len = name->stringLength;
FT_Error error = SFNT_Err_Ok;
FT_UNUSED( error );
if ( !FT_ALLOC( result, len + 1 ) )
{
FT_Stream stream = face->name_table.stream;
if ( FT_STREAM_SEEK( name->stringOffset ) ||
FT_STREAM_READ( result, len ) )
{
name->stringOffset = 0;
name->stringLength = 0;
FT_FREE( name->string );
FT_FREE( result );
goto Exit;
}
((char*)result)[len] = '\0';
}
}
Exit:
face->postscript_name = result;
return result;
}
static const FT_Service_PsFontNameRec sfnt_service_ps_name =
{
(FT_PsName_GetFunc)sfnt_get_ps_name
};
/*
* TT CMAP INFO
*/
static const FT_Service_TTCMapsRec tt_service_get_cmap_info =
{
(TT_CMap_Info_GetFunc)tt_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_Err_Invalid_Argument;
}
}
return error;
}
static const FT_Service_BDFRec sfnt_service_bdf =
{
(FT_BDF_GetCharsetIdFunc) sfnt_get_charset_id,
(FT_BDF_GetPropertyFunc) tt_face_find_bdf_prop,
};
#endif /* TT_CONFIG_OPTION_BDF */
/*
* SERVICE LIST
*/
static const FT_ServiceDescRec sfnt_services[] =
{
{ FT_SERVICE_ID_SFNT_TABLE, &sfnt_service_sfnt_table },
{ FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &sfnt_service_ps_name },
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
{ FT_SERVICE_ID_GLYPH_DICT, &sfnt_service_glyph_dict },
#endif
#ifdef TT_CONFIG_OPTION_BDF
{ FT_SERVICE_ID_BDF, &sfnt_service_bdf },
#endif
{ FT_SERVICE_ID_TT_CMAP, &tt_service_get_cmap_info },
{ NULL, NULL }
};
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 FT_CONFIG_OPTION_OLD_INTERNALS
FT_CALLBACK_DEF( FT_Error )
tt_face_load_sfnt_header_stub( TT_Face face,
FT_Stream stream,
FT_Long face_index,
SFNT_Header header )
{
FT_UNUSED( face );
FT_UNUSED( stream );
FT_UNUSED( face_index );
FT_UNUSED( header );
return FT_Err_Unimplemented_Feature;
}
FT_CALLBACK_DEF( FT_Error )
tt_face_load_directory_stub( TT_Face face,
FT_Stream stream,
SFNT_Header header )
{
FT_UNUSED( face );
FT_UNUSED( stream );
FT_UNUSED( header );
return FT_Err_Unimplemented_Feature;
}
FT_CALLBACK_DEF( FT_Error )
tt_face_load_hdmx_stub( TT_Face face,
FT_Stream stream )
{
FT_UNUSED( face );
FT_UNUSED( stream );
return FT_Err_Unimplemented_Feature;
}
FT_CALLBACK_DEF( void )
tt_face_free_hdmx_stub( TT_Face face )
{
FT_UNUSED( face );
}
FT_CALLBACK_DEF( FT_Error )
tt_face_set_sbit_strike_stub( TT_Face face,
FT_UInt x_ppem,
FT_UInt y_ppem,
FT_ULong* astrike_index )
{
/*
* We simply forge a FT_Size_Request and call the real function
* that does all the work.
*
* This stub might be called by libXfont in the X.Org Xserver,
* compiled against version 2.1.8 or newer.
*/
FT_Size_RequestRec req;
req.type = FT_SIZE_REQUEST_TYPE_NOMINAL;
req.width = (FT_F26Dot6)x_ppem;
req.height = (FT_F26Dot6)y_ppem;
req.horiResolution = 0;
req.vertResolution = 0;
*astrike_index = 0x7FFFFFFFUL;
return tt_face_set_sbit_strike( face, &req, astrike_index );
}
FT_CALLBACK_DEF( FT_Error )
tt_face_load_sbit_stub( TT_Face face,
FT_Stream stream )
{
FT_UNUSED( face );
FT_UNUSED( stream );
/*
* This function was originally implemented to load the sbit table.
* However, it has been replaced by `tt_face_load_eblc', and this stub
* is only there for some rogue clients which would want to call it
* directly (which doesn't make much sense).
*/
return FT_Err_Unimplemented_Feature;
}
FT_CALLBACK_DEF( void )
tt_face_free_sbit_stub( TT_Face face )
{
/* nothing to do in this stub */
FT_UNUSED( face );
}
FT_CALLBACK_DEF( FT_Error )
tt_face_load_charmap_stub( TT_Face face,
void* cmap,
FT_Stream input )
{
FT_UNUSED( face );
FT_UNUSED( cmap );
FT_UNUSED( input );
return FT_Err_Unimplemented_Feature;
}
FT_CALLBACK_DEF( FT_Error )
tt_face_free_charmap_stub( TT_Face face,
void* cmap )
{
FT_UNUSED( face );
FT_UNUSED( cmap );
return 0;
}
#endif /* FT_CONFIG_OPTION_OLD_INTERNALS */
static
const SFNT_Interface sfnt_interface =
{
tt_face_goto_table,
sfnt_init_face,
sfnt_load_face,
sfnt_done_face,
sfnt_get_interface,
tt_face_load_any,
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
tt_face_load_sfnt_header_stub,
tt_face_load_directory_stub,
#endif
tt_face_load_head,
tt_face_load_hhea,
tt_face_load_cmap,
tt_face_load_maxp,
tt_face_load_os2,
tt_face_load_post,
tt_face_load_name,
tt_face_free_name,
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
tt_face_load_hdmx_stub,
tt_face_free_hdmx_stub,
#endif
tt_face_load_kern,
tt_face_load_gasp,
tt_face_load_pclt,
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
/* see `ttload.h' */
tt_face_load_bhed,
#else
0,
#endif
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
tt_face_set_sbit_strike_stub,
tt_face_load_sbit_stub,
tt_find_sbit_image,
tt_load_sbit_metrics,
#endif
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
tt_face_load_sbit_image,
#else
0,
#endif
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
tt_face_free_sbit_stub,
#endif
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
/* see `ttpost.h' */
tt_face_get_ps_name,
tt_face_free_ps_names,
#else
0,
0,
#endif
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
tt_face_load_charmap_stub,
tt_face_free_charmap_stub,
#endif
/* since version 2.1.8 */
tt_face_get_kerning,
/* since version 2.2 */
tt_face_load_font_dir,
tt_face_load_hmtx,
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
/* see `ttsbit.h' and `sfnt.h' */
tt_face_load_eblc,
tt_face_free_eblc,
tt_face_set_sbit_strike,
tt_face_load_strike_metrics,
#else
0,
0,
0,
0,
#endif
tt_face_get_metrics
};
FT_CALLBACK_TABLE_DEF
const FT_Module_Class 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)0,
(FT_Module_Destructor) 0,
(FT_Module_Requester) sfnt_get_interface
};
/* END */