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kc3-lang/freetype/src/cff/t2driver.c
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Author :
Werner Lemberg
Date : 2000-08-03 00:03:08
Hash : 29a90e26
Message : Updating unix/ftconfig.in to recent config/ftconfig.h changes. More C++ fixes: Introducing LOCAL_FUNC_X for local functions used in function pointers (there are no local anonymous functions in C++) and FT_CPLUSPLUS (instead of FT_EXPORT_VAR) to define linkage of structures which contain function pointers.
- src/cff/t2driver.c
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/***************************************************************************/ /* */ /* t2driver.c */ /* */ /* OpenType font driver implementation (body). */ /* */ /* Copyright 1996-2000 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/freetype.h> #include <freetype/internal/ftdebug.h> #include <freetype/internal/ftstream.h> #include <freetype/internal/sfnt.h> #include <freetype/ttnameid.h> #include <freetype/internal/t2errors.h> #ifdef FT_FLAT_COMPILE #include "t2driver.h" #include "t2gload.h" #else #include <cff/t2driver.h> #include <cff/t2gload.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 trace_t2driver /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** 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 T2_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 T2_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( T2_GlyphSlot slot, T2_Size size, FT_UShort glyph_index, FT_UInt load_flags ) { FT_Error error; if ( !slot ) return T2_Err_Invalid_Glyph_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 T2_Err_Invalid_Face_Handle; } /* now load the glyph outline if necessary */ error = T2_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 ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* 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 t2_get_char_index( TT_CharMap charmap, FT_Long charcode ) { FT_Error error; T2_Face face; TT_CMapTable* cmap; cmap = &charmap->cmap; face = (T2_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 ); } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** D R I V E R I N T E R F A C E ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ static FT_Module_Interface t2_get_interface( T2_Driver driver, const char* interface ) { FT_Module sfnt; /* 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_CPLUSPLUS( const FT_Driver_Class ) cff_driver_class = { /* begin with the FT_Module_Class fields */ { ft_module_font_driver | ft_module_driver_scalable, sizeof( T2_DriverRec ), "cff", 0x10000L, 0x20000L, 0, /* module-specific interface */ (FT_Module_Constructor)T2_Init_Driver, (FT_Module_Destructor) T2_Done_Driver, (FT_Module_Requester) t2_get_interface, }, /* now the specific driver fields */ sizeof( TT_FaceRec ), sizeof( FT_SizeRec ), sizeof( T2_GlyphSlotRec ), (FTDriver_initFace) T2_Init_Face, (FTDriver_doneFace) T2_Done_Face, (FTDriver_initSize) 0, (FTDriver_doneSize) 0, (FTDriver_initGlyphSlot)0, (FTDriver_doneGlyphSlot)0, (FTDriver_setCharSizes) 0, (FTDriver_setPixelSizes)0, (FTDriver_loadGlyph) Load_Glyph, (FTDriver_getCharIndex) t2_get_char_index, (FTDriver_getKerning) Get_Kerning, (FTDriver_attachFile) 0, (FTDriver_getAdvances) 0 }; #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. */ /* */ EXPORT_FUNC( FT_Driver_Class* ) getDriverClass( void ) { return &cff_driver_class; } #endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */ /* END */