ref: eeaa6497c31b552eada8974dde8dacf464321787
dir: /src/truetype/ttdriver.c/
/***************************************************************************/ /* */ /* ttdriver.c */ /* */ /* TrueType font driver implementation (body). */ /* */ /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006 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_DEBUG_H #include FT_INTERNAL_STREAM_H #include FT_INTERNAL_SFNT_H #include FT_TRUETYPE_IDS_H #include FT_SERVICE_XFREE86_NAME_H #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT #include FT_MULTIPLE_MASTERS_H #include FT_SERVICE_MULTIPLE_MASTERS_H #endif #include FT_SERVICE_TRUETYPE_ENGINE_H #include "ttdriver.h" #include "ttgload.h" #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT #include "ttgxvar.h" #endif #include "tterrors.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_ttdriver /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** F A C E S ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ #undef PAIR_TAG #define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \ (FT_ULong)right ) /*************************************************************************/ /* */ /* <Function> */ /* tt_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 tt_get_kerning( FT_Face ttface, /* TT_Face */ FT_UInt left_glyph, FT_UInt right_glyph, FT_Vector* kerning ) { TT_Face face = (TT_Face)ttface; SFNT_Service sfnt = (SFNT_Service)face->sfnt; kerning->x = 0; kerning->y = 0; if ( sfnt ) kerning->x = sfnt->get_kerning( face, left_glyph, right_glyph ); return 0; } #undef PAIR_TAG /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** S I Z E S ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS static FT_Error tt_size_select( FT_Size size, FT_ULong strike_index ) { TT_Face ttface = (TT_Face)size->face; TT_Size ttsize = (TT_Size)size; FT_Error error = TT_Err_Ok; ttsize->strike_index = strike_index; if ( FT_IS_SCALABLE( size->face ) ) { /* use the scaled metrics, even when tt_size_reset fails */ FT_Select_Metrics( size->face, strike_index ); tt_size_reset( ttsize ); } else { SFNT_Service sfnt = (SFNT_Service) ttface->sfnt; FT_Size_Metrics* metrics = &size->metrics; error = sfnt->load_strike_metrics( ttface, strike_index, metrics ); if ( error ) ttsize->strike_index = 0xFFFFFFFFUL; } return error; } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ static FT_Error tt_size_request( FT_Size size, FT_Size_Request req ) { TT_Size ttsize = (TT_Size)size; FT_Error error = TT_Err_Ok; #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS if ( FT_HAS_FIXED_SIZES( size->face ) ) { TT_Face ttface = (TT_Face)size->face; SFNT_Service sfnt = (SFNT_Service) ttface->sfnt; FT_ULong index; error = sfnt->set_sbit_strike( ttface, req, &index ); if ( error ) ttsize->strike_index = 0xFFFFFFFFUL; else return tt_size_select( size, index ); } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ FT_Request_Metrics( size->face, req ); if ( FT_IS_SCALABLE( size->face ) ) error = tt_size_reset( ttsize ); return error; } /*************************************************************************/ /* */ /* <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( FT_GlyphSlot ttslot, /* TT_GlyphSlot */ FT_Size ttsize, /* TT_Size */ FT_UInt glyph_index, FT_Int32 load_flags ) { TT_GlyphSlot slot = (TT_GlyphSlot)ttslot; TT_Size size = (TT_Size)ttsize; FT_Face face = ttslot->face; FT_Error error; if ( !slot ) return TT_Err_Invalid_Slot_Handle; if ( !size ) return TT_Err_Invalid_Size_Handle; if ( !face || glyph_index >= (FT_UInt)face->num_glyphs ) return TT_Err_Invalid_Argument; if ( load_flags & ( FT_LOAD_NO_RECURSE | FT_LOAD_NO_SCALE ) ) { load_flags |= FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP | FT_LOAD_NO_SCALE; } /* now load the glyph outline if necessary */ error = TT_Load_Glyph( size, slot, glyph_index, load_flags ); /* force drop-out mode to 2 - irrelevant now */ /* slot->outline.dropout_mode = 2; */ return error; } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /**** ****/ /**** ****/ /**** D R I V E R I N T E R F A C E ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT static const FT_Service_MultiMastersRec tt_service_gx_multi_masters = { (FT_Get_MM_Func) NULL, (FT_Set_MM_Design_Func) NULL, (FT_Set_MM_Blend_Func) TT_Set_MM_Blend, (FT_Get_MM_Var_Func) TT_Get_MM_Var, (FT_Set_Var_Design_Func)TT_Set_Var_Design }; #endif static const FT_Service_TrueTypeEngineRec tt_service_truetype_engine = { #ifdef TT_USE_BYTECODE_INTERPRETER #ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING FT_TRUETYPE_ENGINE_TYPE_UNPATENTED #else FT_TRUETYPE_ENGINE_TYPE_PATENTED #endif #else /* !TT_USE_BYTECODE_INTERPRETER */ FT_TRUETYPE_ENGINE_TYPE_NONE #endif /* TT_USE_BYTECODE_INTERPRETER */ }; static const FT_ServiceDescRec tt_services[] = { { FT_SERVICE_ID_XF86_NAME, FT_XF86_FORMAT_TRUETYPE }, #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT { FT_SERVICE_ID_MULTI_MASTERS, &tt_service_gx_multi_masters }, #endif { FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine }, { NULL, NULL } }; FT_CALLBACK_DEF( FT_Module_Interface ) tt_get_interface( FT_Module driver, /* TT_Driver */ const char* tt_interface ) { FT_Module_Interface result; FT_Module sfntd; SFNT_Service sfnt; result = ft_service_list_lookup( tt_services, tt_interface ); if ( result != NULL ) return result; /* only return the default interface from the SFNT module */ sfntd = FT_Get_Module( driver->library, "sfnt" ); if ( sfntd ) { sfnt = (SFNT_Service)( sfntd->clazz->module_interface ); if ( sfnt ) return sfnt->get_interface( driver, tt_interface ); } return 0; } /* The FT_DriverInterface structure is defined in ftdriver.h. */ FT_CALLBACK_TABLE_DEF const FT_Driver_ClassRec tt_driver_class = { { FT_MODULE_FONT_DRIVER | FT_MODULE_DRIVER_SCALABLE | #ifdef TT_USE_BYTECODE_INTERPRETER FT_MODULE_DRIVER_HAS_HINTER, #else 0, #endif sizeof ( TT_DriverRec ), "truetype", /* driver name */ 0x10000L, /* driver version == 1.0 */ 0x20000L, /* driver requires FreeType 2.0 or above */ (void*)0, /* driver specific interface */ tt_driver_init, tt_driver_done, tt_get_interface, }, sizeof ( TT_FaceRec ), sizeof ( TT_SizeRec ), sizeof ( FT_GlyphSlotRec ), tt_face_init, tt_face_done, tt_size_init, tt_size_done, tt_slot_init, 0, /* FT_Slot_DoneFunc */ #ifdef FT_CONFIG_OPTION_OLD_INTERNALS ft_stub_set_char_sizes, ft_stub_set_pixel_sizes, #endif Load_Glyph, tt_get_kerning, 0, /* FT_Face_AttachFunc */ 0, /* FT_Face_GetAdvancesFunc */ tt_size_request, #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS tt_size_select #else 0 /* FT_Size_SelectFunc */ #endif }; /* END */