| /***************************************************************************/ |
| /* */ |
| /* cffdrivr.c */ |
| /* */ |
| /* OpenType font driver implementation (body). */ |
| /* */ |
| /* Copyright 1996-2001 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_FREETYPE_H |
| #include FT_INTERNAL_DEBUG_H |
| #include FT_INTERNAL_STREAM_H |
| #include FT_INTERNAL_SFNT_H |
| #include FT_TRUETYPE_IDS_H |
| |
| #include "cffdrivr.h" |
| #include "cffgload.h" |
| #include "cffload.h" |
| |
| #include "cfferrs.h" |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* 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 trace_cffdriver |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /**** ****/ |
| /**** ****/ |
| /**** F A C E S ****/ |
| /**** ****/ |
| /**** ****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| |
| #undef PAIR_TAG |
| #define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \ |
| (FT_ULong)right ) |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* Get_Kerning */ |
| /* */ |
| /* <Description> */ |
| /* A driver method used to return the kerning vector between two */ |
| /* glyphs of the same face. */ |
| /* */ |
| /* <Input> */ |
| /* face :: A handle to the source face object. */ |
| /* */ |
| /* left_glyph :: The index of the left glyph in the kern pair. */ |
| /* */ |
| /* right_glyph :: The index of the right glyph in the kern pair. */ |
| /* */ |
| /* <Output> */ |
| /* kerning :: The kerning vector. This is in font units for */ |
| /* scalable formats, and in pixels for fixed-sizes */ |
| /* formats. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| /* <Note> */ |
| /* Only horizontal layouts (left-to-right & right-to-left) are */ |
| /* supported by this function. Other layouts, or more sophisticated */ |
| /* kernings, are out of scope of this method (the basic driver */ |
| /* interface is meant to be simple). */ |
| /* */ |
| /* They can be implemented by format-specific interfaces. */ |
| /* */ |
| static FT_Error |
| Get_Kerning( TT_Face face, |
| FT_UInt left_glyph, |
| FT_UInt right_glyph, |
| FT_Vector* kerning ) |
| { |
| TT_Kern_0_Pair* pair; |
| |
| |
| if ( !face ) |
| return CFF_Err_Invalid_Face_Handle; |
| |
| kerning->x = 0; |
| kerning->y = 0; |
| |
| if ( face->kern_pairs ) |
| { |
| /* there are some kerning pairs in this font file! */ |
| FT_ULong search_tag = PAIR_TAG( left_glyph, right_glyph ); |
| FT_Long left, right; |
| |
| |
| left = 0; |
| right = face->num_kern_pairs - 1; |
| |
| while ( left <= right ) |
| { |
| FT_Int middle = left + ( ( right - left ) >> 1 ); |
| FT_ULong cur_pair; |
| |
| |
| pair = face->kern_pairs + middle; |
| cur_pair = PAIR_TAG( pair->left, pair->right ); |
| |
| if ( cur_pair == search_tag ) |
| goto Found; |
| |
| if ( cur_pair < search_tag ) |
| left = middle + 1; |
| else |
| right = middle - 1; |
| } |
| } |
| |
| Exit: |
| return CFF_Err_Ok; |
| |
| Found: |
| kerning->x = pair->value; |
| goto Exit; |
| } |
| |
| |
| #undef PAIR_TAG |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* Load_Glyph */ |
| /* */ |
| /* <Description> */ |
| /* A driver method used to load a glyph within a given glyph slot. */ |
| /* */ |
| /* <Input> */ |
| /* slot :: A handle to the target slot object where the glyph */ |
| /* will be loaded. */ |
| /* */ |
| /* size :: A handle to the source face size at which the glyph */ |
| /* must be scaled, loaded, etc. */ |
| /* */ |
| /* glyph_index :: The index of the glyph in the font file. */ |
| /* */ |
| /* load_flags :: A flag indicating what to load for this glyph. The */ |
| /* FTLOAD_??? constants can be used to control the */ |
| /* glyph loading process (e.g., whether the outline */ |
| /* should be scaled, whether to load bitmaps or not, */ |
| /* whether to hint the outline, etc). */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| static FT_Error |
| Load_Glyph( CFF_GlyphSlot slot, |
| CFF_Size size, |
| FT_UShort glyph_index, |
| FT_UInt load_flags ) |
| { |
| FT_Error error; |
| |
| |
| if ( !slot ) |
| return CFF_Err_Invalid_Slot_Handle; |
| |
| /* check whether we want a scaled outline or bitmap */ |
| if ( !size ) |
| load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; |
| |
| if ( load_flags & FT_LOAD_NO_SCALE ) |
| size = NULL; |
| |
| /* reset the size object if necessary */ |
| if ( size ) |
| { |
| /* these two object must have the same parent */ |
| if ( size->face != slot->root.face ) |
| return CFF_Err_Invalid_Face_Handle; |
| } |
| |
| /* now load the glyph outline if necessary */ |
| error = CFF_Load_Glyph( slot, size, glyph_index, load_flags ); |
| |
| /* force drop-out mode to 2 - irrelevant now */ |
| /* slot->outline.dropout_mode = 2; */ |
| |
| return error; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /**** ****/ |
| /**** ****/ |
| /**** C H A R A C T E R M A P P I N G S ****/ |
| /**** ****/ |
| /**** ****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static FT_Error |
| cff_get_glyph_name( CFF_Face face, |
| FT_UInt glyph_index, |
| FT_Pointer buffer, |
| FT_UInt buffer_max ) |
| { |
| CFF_Font* font = (CFF_Font*)face->extra.data; |
| FT_Memory memory = FT_FACE_MEMORY( face ); |
| FT_String* gname; |
| FT_UShort sid; |
| PSNames_Interface* psnames; |
| FT_Error error; |
| |
| psnames = (PSNames_Interface*)FT_Get_Module_Interface( |
| face->root.driver->root.library, "psnames" ); |
| |
| if ( !psnames ) |
| { |
| FT_ERROR(( "CFF_Init_Face:" )); |
| FT_ERROR(( " cannot open CFF & CEF fonts\n" )); |
| FT_ERROR(( " " )); |
| FT_ERROR(( " without the `PSNames' module\n" )); |
| error = CFF_Err_Unknown_File_Format; |
| goto Exit; |
| } |
| |
| /* first, locate the sid in the charset table */ |
| sid = font->charset.sids[glyph_index]; |
| |
| /* now, lookup the name itself */ |
| gname = CFF_Get_String( &font->string_index, sid, psnames ); |
| |
| if ( buffer_max > 0 ) |
| { |
| FT_UInt len = strlen( gname ); |
| |
| |
| if ( len >= buffer_max ) |
| len = buffer_max - 1; |
| |
| MEM_Copy( buffer, gname, len ); |
| ((FT_Byte*)buffer)[len] = 0; |
| } |
| |
| FREE ( gname ); |
| error = CFF_Err_Ok; |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* cff_get_char_index */ |
| /* */ |
| /* <Description> */ |
| /* Uses a charmap to return a given character code's glyph index. */ |
| /* */ |
| /* <Input> */ |
| /* charmap :: A handle to the source charmap object. */ |
| /* charcode :: The character code. */ |
| /* */ |
| /* <Return> */ |
| /* Glyph index. 0 means `undefined character code'. */ |
| /* */ |
| static FT_UInt |
| cff_get_char_index( TT_CharMap charmap, |
| FT_Long charcode ) |
| { |
| FT_Error error; |
| CFF_Face face; |
| TT_CMapTable* cmap; |
| |
| |
| cmap = &charmap->cmap; |
| face = (CFF_Face)charmap->root.face; |
| |
| /* Load table if needed */ |
| if ( !cmap->loaded ) |
| { |
| SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt; |
| |
| |
| error = sfnt->load_charmap( face, cmap, face->root.stream ); |
| if ( error ) |
| return 0; |
| |
| cmap->loaded = TRUE; |
| } |
| |
| return ( cmap->get_index ? cmap->get_index( cmap, charcode ) : 0 ); |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* cff_get_next_char */ |
| /* */ |
| /* <Description> */ |
| /* Uses a charmap to return the next encoded charcode. */ |
| /* */ |
| /* <Input> */ |
| /* charmap :: A handle to the source charmap object. */ |
| /* charcode :: The character code. */ |
| /* */ |
| /* <Return> */ |
| /* Char code. 0 means `no encoded chars above the given one'. */ |
| /* */ |
| static FT_Long |
| cff_get_next_char( TT_CharMap charmap, |
| FT_Long charcode ) |
| { |
| FT_Error error; |
| CFF_Face face; |
| TT_CMapTable* cmap; |
| |
| |
| cmap = &charmap->cmap; |
| face = (CFF_Face)charmap->root.face; |
| |
| /* Load table if needed */ |
| if ( !cmap->loaded ) |
| { |
| SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt; |
| |
| |
| error = sfnt->load_charmap( face, cmap, face->root.stream ); |
| if ( error ) |
| return 0; |
| |
| cmap->loaded = TRUE; |
| } |
| |
| return ( cmap->get_next_char ? cmap->get_next_char( cmap, charcode ) : 0 ); |
| } |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* cff_get_name_index */ |
| /* */ |
| /* <Description> */ |
| /* Uses the psnames module and the CFF font's charset to to return a */ |
| /* a given glyph name's glyph index. */ |
| /* */ |
| /* <Input> */ |
| /* face :: A handle to the source face object. */ |
| /* */ |
| /* glyph_name :: The glyph name. */ |
| /* */ |
| /* <Return> */ |
| /* Glyph index. 0 means `undefined character code'. */ |
| /* */ |
| static FT_UInt |
| cff_get_name_index( CFF_Face face, |
| FT_String* glyph_name ) |
| { |
| CFF_Font* cff; |
| CFF_Charset* charset; |
| PSNames_Interface* psnames; |
| FT_Memory memory = FT_FACE_MEMORY( face ); |
| FT_String* name; |
| FT_UShort sid; |
| FT_UInt i; |
| FT_Int result; |
| |
| |
| cff = face->extra.data; |
| charset = &cff->charset; |
| |
| psnames = (PSNames_Interface*)FT_Get_Module_Interface( |
| face->root.driver->root.library, "psnames" ); |
| |
| for ( i = 0; i < cff->num_glyphs; i++ ) |
| { |
| sid = charset->sids[i]; |
| |
| if ( sid > 390 ) |
| name = CFF_Get_Name( &cff->string_index, sid - 391 ); |
| else |
| name = (FT_String *)psnames->adobe_std_strings( sid ); |
| |
| result = strcmp( glyph_name, name ); |
| |
| if ( sid > 390 ) |
| FREE( name ); |
| |
| if ( !result ) |
| return i; |
| } |
| |
| return 0; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /**** ****/ |
| /**** ****/ |
| /**** D R I V E R I N T E R F A C E ****/ |
| /**** ****/ |
| /**** ****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static FT_Module_Interface |
| cff_get_interface( CFF_Driver driver, |
| const char* interface ) |
| { |
| FT_Module sfnt; |
| |
| #ifndef FT_CONFIG_OPTION_NO_GLYPH_NAMES |
| |
| if ( strcmp( (const char*)interface, "glyph_name" ) == 0 ) |
| return (FT_Module_Interface)cff_get_glyph_name; |
| |
| if ( strcmp( (const char*)interface, "name_index" ) == 0 ) |
| return (FT_Module_Interface)cff_get_name_index; |
| |
| #endif |
| |
| /* we simply pass our request to the `sfnt' module */ |
| sfnt = FT_Get_Module( driver->root.root.library, "sfnt" ); |
| |
| return sfnt ? sfnt->clazz->get_interface( sfnt, interface ) : 0; |
| } |
| |
| |
| /* The FT_DriverInterface structure is defined in ftdriver.h. */ |
| |
| FT_CALLBACK_TABLE_DEF |
| const FT_Driver_Class cff_driver_class = |
| { |
| /* begin with the FT_Module_Class fields */ |
| { |
| ft_module_font_driver | |
| ft_module_driver_scalable | |
| ft_module_driver_has_hinter, |
| |
| sizeof( CFF_DriverRec ), |
| "cff", |
| 0x10000L, |
| 0x20000L, |
| |
| 0, /* module-specific interface */ |
| |
| (FT_Module_Constructor)CFF_Driver_Init, |
| (FT_Module_Destructor) CFF_Driver_Done, |
| (FT_Module_Requester) cff_get_interface, |
| }, |
| |
| /* now the specific driver fields */ |
| sizeof( TT_FaceRec ), |
| sizeof( FT_SizeRec ), |
| sizeof( CFF_GlyphSlotRec ), |
| |
| (FTDriver_initFace) CFF_Face_Init, |
| (FTDriver_doneFace) CFF_Face_Done, |
| (FTDriver_initSize) CFF_Size_Init, |
| (FTDriver_doneSize) CFF_Size_Done, |
| (FTDriver_initGlyphSlot)CFF_GlyphSlot_Init, |
| (FTDriver_doneGlyphSlot)CFF_GlyphSlot_Done, |
| |
| (FTDriver_setCharSizes) CFF_Size_Reset, |
| (FTDriver_setPixelSizes)CFF_Size_Reset, |
| |
| (FTDriver_loadGlyph) Load_Glyph, |
| (FTDriver_getCharIndex) cff_get_char_index, |
| |
| (FTDriver_getKerning) Get_Kerning, |
| (FTDriver_attachFile) 0, |
| (FTDriver_getAdvances) 0, |
| |
| (FTDriver_getNextChar) cff_get_next_char |
| }; |
| |
| |
| #ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Function> */ |
| /* getDriverClass */ |
| /* */ |
| /* <Description> */ |
| /* This function is used when compiling the TrueType driver as a */ |
| /* shared library (`.DLL' or `.so'). It will be used by the */ |
| /* high-level library of FreeType to retrieve the address of the */ |
| /* driver's generic interface. */ |
| /* */ |
| /* It shouldn't be implemented in a static build, as each driver must */ |
| /* have the same function as an exported entry point. */ |
| /* */ |
| /* <Return> */ |
| /* The address of the TrueType's driver generic interface. The */ |
| /* format-specific interface can then be retrieved through the method */ |
| /* interface->get_format_interface. */ |
| /* */ |
| FT_EXPORT_DEF( const FT_Driver_Class* ) |
| getDriverClass( void ) |
| { |
| return &cff_driver_class; |
| } |
| |
| |
| #endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */ |
| |
| |
| /* END */ |
