kc3-lang/freetype/src/type1/t1driver.c
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Hash : e49ab25c
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Date : 2000-05-16T23:44:38
formatting - removed trailing spaces
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src/type1/t1driver.c
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/******************************************************************* * * t1driver.c * * High-level Type1 driver interface for FreeType 2.0 * * Copyright 1996-1998 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 <t1driver.h> #include <t1gload.h> #include <t1afm.h> #include <freetype/internal/ftdebug.h> #include <freetype/internal/ftstream.h> #include <freetype/internal/psnames.h> #undef FT_COMPONENT #define FT_COMPONENT trace_t1driver #ifndef T1_CONFIG_OPTION_NO_AFM /*************************************************************************/ /* */ /* <Function> */ /* Get_Interface */ /* */ /* <Description> */ /* Each driver can provide one or more extensions to the base */ /* FreeType API. These can be used to access format specific */ /* features (e.g., all TrueType/OpenType resources share a common */ /* file structure and common tables which can be accessed through the */ /* `sfnt' interface), or more simply generic ones (e.g., the */ /* `postscript names' interface which can be used to retrieve the */ /* PostScript name of a given glyph index). */ /* */ /* <InOut> */ /* driver :: A handle to a driver object. */ /* */ /* <Input> */ /* interface :: A string designing the interface. Examples are */ /* `sfnt', `post_names', `charmaps', etc. */ /* */ /* <Return> */ /* A typeless pointer to the extension's interface (normally a table */ /* of function pointers). Returns NULL if the requested extension */ /* isn't available (i.e., wasn't compiled in the driver at build */ /* time). */ /* */ static FTDriver_Interface Get_Interface( FT_Driver driver, const FT_String* interface ) { UNUSED(driver); if ( strcmp( (const char*)interface, "attach_file" ) == 0 ) return (FTDriver_Interface)T1_Read_AFM; return 0; } /*************************************************************************/ /* */ /* <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 T1_Error Get_Kerning( T1_Face face, T1_UInt left_glyph, T1_UInt right_glyph, T1_Vector* kerning ) { T1_AFM* afm; kerning->x = 0; kerning->y = 0; afm = (T1_AFM*)face->afm_data; if (afm) T1_Get_Kerning( afm, left_glyph, right_glyph, kerning ); return T1_Err_Ok; } #endif /******************************************************************/ /* */ /* <Function> Set_Char_Sizes */ /* */ /* <Description> */ /* A driver method used to reset a size's character sizes */ /* (horizontal and vertical) expressed in fractional points. */ /* */ /* <Input> */ /* size :: handle to target size object */ /* char_width :: character width expressed in 26.6 points */ /* char_height :: character height expressed in 26.6 points */ /* */ /* <Return> */ /* FreeType error code. 0 means success */ /* */ static T1_Error Set_Char_Sizes( T1_Size size, T1_F26Dot6 char_width, T1_F26Dot6 char_height, T1_UInt horz_resolution, T1_UInt vert_resolution ) { UNUSED(char_width); UNUSED(char_height); UNUSED(horz_resolution); UNUSED(vert_resolution); size->valid = FALSE; return T1_Reset_Size( size ); } /******************************************************************/ /* */ /* <Function> Set_Pixel_Sizes */ /* */ /* <Description> */ /* A driver method used to reset a size's character sizes */ /* (horizontal and vertical) expressed in integer pixels. */ /* */ /* <Input> */ /* size :: handle to target size object */ /* */ /* pixel_width :: character width expressed in 26.6 points */ /* */ /* pixel_height :: character height expressed in 26.6 points */ /* */ /* char_size :: the corresponding character size in points */ /* This value is only sent to the TrueType */ /* bytecode interpreter, even though 99% of */ /* glyph programs will simply ignore it. A */ /* safe value there is the maximum of the */ /* pixel width and height (multiplied by */ /* 64 to make it a 26.6 fixed float !) */ /* <Return> */ /* FreeType error code. 0 means success */ /* */ static T1_Error Set_Pixel_Sizes( T1_Size size, T1_Int pixel_width, T1_Int pixel_height ) { UNUSED(pixel_width); UNUSED(pixel_height); size->valid = FALSE; return T1_Reset_Size(size); } /*************************************************************************/ /* */ /* <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 T1_UInt Get_Char_Index( FT_CharMap charmap, T1_Long charcode ) { T1_Face face; T1_UInt result = 0; PSNames_Interface* psnames; face = (T1_Face)charmap->face; psnames = (PSNames_Interface*)face->psnames; if (psnames) switch (charmap->encoding) { /********************************************************************/ /* */ /* Unicode encoding support */ /* */ case ft_encoding_unicode: { /* use the "psnames" module to synthetize the Unicode charmap */ result = psnames->lookup_unicode( &face->unicode_map, (T1_ULong)charcode ); /* the function returns 0xFFFF when the Unicode charcode has */ /* no corresponding glyph.. */ if (result == 0xFFFF) result = 0; goto Exit; } /********************************************************************/ /* */ /* Custom Type 1 encoding */ /* */ case ft_encoding_adobe_custom: { T1_Encoding* encoding = &face->type1.encoding; if (charcode >= encoding->code_first && charcode <= encoding->code_last) { result = encoding->char_index[charcode]; } goto Exit; } /********************************************************************/ /* */ /* Adobe Standard & Expert encoding support */ /* */ default: if (charcode < 256) { FT_UInt code; FT_Int n; const char* glyph_name; code = psnames->adobe_std_encoding[charcode]; if (charmap->encoding == ft_encoding_adobe_expert) code = psnames->adobe_expert_encoding[charcode]; glyph_name = psnames->adobe_std_strings(code); if (!glyph_name) break; for ( n = 0; n < face->type1.num_glyphs; n++ ) { const char* gname = face->type1.glyph_names[n]; if ( gname && gname[0] == glyph_name[0] && strcmp( gname, glyph_name ) == 0 ) { result = n; break; } } } } Exit: return result; } /******************************************************************/ /* */ /* <Struct> FT_DriverInterface */ /* */ /* <Description> */ /* A structure used to hold a font driver's basic interface */ /* used by the high-level parts of FreeType (or other apps) */ /* */ /* Most scalable drivers provide a specialized interface to */ /* access format-specific features. It can be retrieved with */ /* a call to the "get_format_interface", and should be defined */ /* in each font driver header (e.g. ttdriver.h, t1driver.h,..) */ /* */ /* All fields are function pointers .. */ /* */ /* */ /* <Fields> */ /* */ /* new_engine :: */ /* used to create and initialise a new driver object */ /* */ /* done_engine :: */ /* used to finalise and destroy a given driver object */ /* */ /* get_format_interface :: */ /* return a typeless pointer to the format-specific */ /* driver interface. */ /* */ /* new_face :: */ /* create a new face object from a resource */ /* */ /* done_face :: */ /* discards a face object, as well as all child objects */ /* ( sizes, charmaps, glyph slots ) */ /* */ /* get_face_properties :: */ /* return generic face properties */ /* */ /* get_kerning :: */ /* return the kerning vector corresponding to a pair */ /* of glyphs, expressed in unscaled font units. */ /* */ /* new_size :: */ /* create and initialise a new scalable size object. */ /* */ /* new_fixed_size :: */ /* create and initialise a new fixed-size object. */ /* */ /* done_size :: */ /* finalize a given face size object. */ /* */ /* set_size_resolutions :: */ /* reset a scalable size object's output resolutions */ /* */ /* set_size_char_sizes :: */ /* reset a scalable size object's character size */ /* */ /* set_pixel_sizes :: */ /* reset a face size object's pixel dimensions. Applies */ /* to both scalable and fixed faces. */ /* */ /* new_glyph_slot :: */ /* create and initialise a new glyph slot */ /* */ /* done_glyph_slot :: */ /* discard a given glyph slot */ /* */ /* load_glyph :: */ /* load a given glyph into a given slot */ /* */ /* get_glyph_metrics :: */ /* return a loaded glyph's metrics. */ /* */ const FT_DriverInterface t1_driver_interface = { sizeof( FT_DriverRec ), sizeof( T1_FaceRec ), sizeof( T1_SizeRec ), sizeof( T1_GlyphSlotRec ), "type1", 100, 200, 0, /* format interface */ (FTDriver_initDriver) T1_Init_Driver, (FTDriver_doneDriver) T1_Done_Driver, #ifdef T1_CONFIG_OPTION_NO_AFM (FTDriver_getInterface) 0, #else (FTDriver_getInterface) Get_Interface, #endif (FTDriver_initFace) T1_Init_Face, (FTDriver_doneFace) T1_Done_Face, #ifdef T1_CONFIG_OPTION_NO_AFM (FTDriver_getKerning) 0, #else (FTDriver_getKerning) Get_Kerning, #endif (FTDriver_initSize) T1_Init_Size, (FTDriver_doneSize) T1_Done_Size, (FTDriver_setCharSizes) Set_Char_Sizes, (FTDriver_setPixelSizes) Set_Pixel_Sizes, (FTDriver_initGlyphSlot) T1_Init_GlyphSlot, (FTDriver_doneGlyphSlot) T1_Done_GlyphSlot, (FTDriver_loadGlyph) T1_Load_Glyph, (FTDriver_getCharIndex) Get_Char_Index, }; /******************************************************************/ /* */ /* <Function> Get_FreeType_Driver_Interface */ /* */ /* <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> */ /* address of TrueType's driver generic interface. The */ /* forma-specific interface can then be retrieved through */ /* the method interface->get_format_interface.. */ /* */ #ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS EXPORT_FUNC(FT_DriverInterface*) getDriverInterface( void ) { return &t1_driver_interface; } #endif /* FT_CONFIG_OPTION_DYNAMIC_DRIVERS */