sfdriver.c
上传用户:yisoukefu
上传日期:2020-08-09
资源大小:39506k
文件大小:14k
- /***************************************************************************/
- /* */
- /* 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 = ' ';
- 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] = ' ';
- }
- }
- 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 */