/***************************************************************************/ /* */ /* ttdriver.c */ /* */ /* TrueType font driver implementation (body). */ /* */ /* Copyright 1996-2001, 2002, 2003, 2004, 2005 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 #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 "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 ) /*************************************************************************/ /* */ /* */ /* tt_get_kerning */ /* */ /* */ /* A driver method used to return the kerning vector between two */ /* glyphs of the same face. */ /* */ /* */ /* 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. */ /* */ /* */ /* kerning :: The kerning vector. This is in font units for */ /* scalable formats, and in pixels for fixed-sizes */ /* formats. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ /* */ /* 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 ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* Set_Char_Sizes */ /* */ /* */ /* A driver method used to reset a size's character sizes (horizontal */ /* and vertical) expressed in fractional points. */ /* */ /* */ /* char_width :: The character width expressed in 26.6 */ /* fractional points. */ /* */ /* char_height :: The character height expressed in 26.6 */ /* fractional points. */ /* */ /* horz_resolution :: The horizontal resolution of the output device. */ /* */ /* vert_resolution :: The vertical resolution of the output device. */ /* */ /* */ /* size :: A handle to the target size object. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ static FT_Error Set_Char_Sizes( FT_Size ttsize, /* TT_Size */ FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt horz_resolution, FT_UInt vert_resolution ) { TT_Size size = (TT_Size)ttsize; FT_Size_Metrics* metrics = &size->metrics; TT_Face face = (TT_Face)size->root.face; /* copy the result from base layer */ *metrics = size->root.metrics; /* This bit flag, when set, indicates that the pixel size must be */ /* rounded to integer. Nearly all TrueType fonts have this bit */ /* set, as hinting won't work really well otherwise. */ /* */ if ( ( face->header.Flags & 8 ) != 0 ) { FT_Long dim_x, dim_y; dim_x = ( char_width * horz_resolution + 36 ) / 72; dim_y = ( char_height * vert_resolution + 36 ) / 72; dim_x = FT_PIX_ROUND( dim_x ); dim_y = FT_PIX_ROUND( dim_y ); metrics->x_ppem = (FT_UShort)( dim_x >> 6 ); metrics->y_ppem = (FT_UShort)( dim_y >> 6 ); metrics->x_scale = FT_DivFix( dim_x, face->root.units_per_EM ); metrics->y_scale = FT_DivFix( dim_y, face->root.units_per_EM ); } size->ttmetrics.valid = FALSE; #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS size->strike_index = 0xFFFFU; #endif return tt_size_reset( size ); } /*************************************************************************/ /* */ /* */ /* Set_Pixel_Sizes */ /* */ /* */ /* A driver method used to reset a size's character sizes (horizontal */ /* and vertical) expressed in integer pixels. */ /* */ /* */ /* size :: A handle to the target size object. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ static FT_Error Set_Pixel_Sizes( FT_Size ttsize, /* TT_Size */ FT_UInt pixel_width, FT_UInt pixel_height ) { TT_Size size = (TT_Size)ttsize; FT_UNUSED( pixel_width ); FT_UNUSED( pixel_height ); /* many things have been pre-computed by the base layer */ size->metrics = size->root.metrics; size->ttmetrics.valid = FALSE; #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS size->strike_index = 0xFFFFU; #endif return tt_size_reset( size ); } /*************************************************************************/ /* */ /* */ /* Load_Glyph */ /* */ /* */ /* A driver method used to load a glyph within a given glyph slot. */ /* */ /* */ /* 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). */ /* */ /* */ /* 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_Error error; if ( !slot ) return TT_Err_Invalid_Slot_Handle; if ( !size ) return TT_Err_Invalid_Size_Handle; 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_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 { 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_CONFIG_OPTION_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 */ Set_Char_Sizes, Set_Pixel_Sizes, Load_Glyph, tt_get_kerning, 0, /* FT_Face_AttachFunc */ 0 /* FT_Face_GetAdvancesFunc */ }; /* END */