1 /***************************************************************************/
5 /* TrueType font driver implementation (body). */
7 /* Copyright 1996-2016 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
16 /***************************************************************************/
20 #include FT_INTERNAL_DEBUG_H
21 #include FT_INTERNAL_STREAM_H
22 #include FT_INTERNAL_SFNT_H
23 #include FT_SERVICE_FONT_FORMAT_H
25 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
26 #include FT_MULTIPLE_MASTERS_H
27 #include FT_SERVICE_MULTIPLE_MASTERS_H
30 #include FT_SERVICE_TRUETYPE_ENGINE_H
31 #include FT_SERVICE_TRUETYPE_GLYF_H
32 #include FT_SERVICE_PROPERTIES_H
33 #include FT_TRUETYPE_DRIVER_H
39 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
47 /*************************************************************************/
49 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
50 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
51 /* messages during execution. */
54 #define FT_COMPONENT trace_ttdriver
62 tt_property_set( FT_Module module, /* TT_Driver */
63 const char* property_name,
66 FT_Error error = FT_Err_Ok;
67 TT_Driver driver = (TT_Driver)module;
70 if ( !ft_strcmp( property_name, "interpreter-version" ) )
72 FT_UInt* interpreter_version = (FT_UInt*)value;
75 if ( *interpreter_version == TT_INTERPRETER_VERSION_35
76 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
77 || *interpreter_version == TT_INTERPRETER_VERSION_38
79 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
80 || *interpreter_version == TT_INTERPRETER_VERSION_40
83 driver->interpreter_version = *interpreter_version;
85 error = FT_ERR( Unimplemented_Feature );
90 FT_TRACE0(( "tt_property_set: missing property `%s'\n",
92 return FT_THROW( Missing_Property );
97 tt_property_get( FT_Module module, /* TT_Driver */
98 const char* property_name,
101 FT_Error error = FT_Err_Ok;
102 TT_Driver driver = (TT_Driver)module;
104 FT_UInt interpreter_version = driver->interpreter_version;
107 if ( !ft_strcmp( property_name, "interpreter-version" ) )
109 FT_UInt* val = (FT_UInt*)value;
112 *val = interpreter_version;
117 FT_TRACE0(( "tt_property_get: missing property `%s'\n",
119 return FT_THROW( Missing_Property );
123 FT_DEFINE_SERVICE_PROPERTIESREC(
124 tt_service_properties,
125 (FT_Properties_SetFunc)tt_property_set, /* set_property */
126 (FT_Properties_GetFunc)tt_property_get ) /* get_property */
129 /*************************************************************************/
130 /*************************************************************************/
131 /*************************************************************************/
134 /**** F A C E S ****/
137 /*************************************************************************/
138 /*************************************************************************/
139 /*************************************************************************/
142 /*************************************************************************/
148 /* A driver method used to return the kerning vector between two */
149 /* glyphs of the same face. */
152 /* face :: A handle to the source face object. */
154 /* left_glyph :: The index of the left glyph in the kern pair. */
156 /* right_glyph :: The index of the right glyph in the kern pair. */
159 /* kerning :: The kerning vector. This is in font units for */
160 /* scalable formats, and in pixels for fixed-sizes */
164 /* FreeType error code. 0 means success. */
167 /* Only horizontal layouts (left-to-right & right-to-left) are */
168 /* supported by this function. Other layouts, or more sophisticated */
169 /* kernings, are out of scope of this method (the basic driver */
170 /* interface is meant to be simple). */
172 /* They can be implemented by format-specific interfaces. */
175 tt_get_kerning( FT_Face ttface, /* TT_Face */
180 TT_Face face = (TT_Face)ttface;
181 SFNT_Service sfnt = (SFNT_Service)face->sfnt;
188 kerning->x = sfnt->get_kerning( face, left_glyph, right_glyph );
195 tt_get_advances( FT_Face ttface,
202 TT_Face face = (TT_Face) ttface;
205 /* XXX: TODO: check for sbits */
207 if ( flags & FT_LOAD_VERTICAL_LAYOUT )
209 for ( nn = 0; nn < count; nn++ )
215 /* since we don't need `tsb', we use zero for `yMax' parameter */
216 TT_Get_VMetrics( face, start + nn, 0, &tsb, &ah );
222 for ( nn = 0; nn < count; nn++ )
228 TT_Get_HMetrics( face, start + nn, &lsb, &aw );
237 /*************************************************************************/
238 /*************************************************************************/
239 /*************************************************************************/
242 /**** S I Z E S ****/
245 /*************************************************************************/
246 /*************************************************************************/
247 /*************************************************************************/
250 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
253 tt_size_select( FT_Size size,
254 FT_ULong strike_index )
256 TT_Face ttface = (TT_Face)size->face;
257 TT_Size ttsize = (TT_Size)size;
258 FT_Error error = FT_Err_Ok;
261 ttsize->strike_index = strike_index;
263 if ( FT_IS_SCALABLE( size->face ) )
265 /* use the scaled metrics, even when tt_size_reset fails */
266 FT_Select_Metrics( size->face, strike_index );
268 tt_size_reset( ttsize ); /* ignore return value */
272 SFNT_Service sfnt = (SFNT_Service) ttface->sfnt;
273 FT_Size_Metrics* metrics = &size->metrics;
276 error = sfnt->load_strike_metrics( ttface, strike_index, metrics );
278 ttsize->strike_index = 0xFFFFFFFFUL;
284 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
288 tt_size_request( FT_Size size,
289 FT_Size_Request req )
291 TT_Size ttsize = (TT_Size)size;
292 FT_Error error = FT_Err_Ok;
295 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
297 if ( FT_HAS_FIXED_SIZES( size->face ) )
299 TT_Face ttface = (TT_Face)size->face;
300 SFNT_Service sfnt = (SFNT_Service) ttface->sfnt;
301 FT_ULong strike_index;
304 error = sfnt->set_sbit_strike( ttface, req, &strike_index );
307 ttsize->strike_index = 0xFFFFFFFFUL;
309 return tt_size_select( size, strike_index );
312 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
314 FT_Request_Metrics( size->face, req );
316 if ( FT_IS_SCALABLE( size->face ) )
318 error = tt_size_reset( ttsize );
319 ttsize->root.metrics = ttsize->metrics;
326 /*************************************************************************/
332 /* A driver method used to load a glyph within a given glyph slot. */
335 /* slot :: A handle to the target slot object where the glyph */
336 /* will be loaded. */
338 /* size :: A handle to the source face size at which the glyph */
339 /* must be scaled, loaded, etc. */
341 /* glyph_index :: The index of the glyph in the font file. */
343 /* load_flags :: A flag indicating what to load for this glyph. The */
344 /* FT_LOAD_XXX constants can be used to control the */
345 /* glyph loading process (e.g., whether the outline */
346 /* should be scaled, whether to load bitmaps or not, */
347 /* whether to hint the outline, etc). */
350 /* FreeType error code. 0 means success. */
353 tt_glyph_load( FT_GlyphSlot ttslot, /* TT_GlyphSlot */
354 FT_Size ttsize, /* TT_Size */
356 FT_Int32 load_flags )
358 TT_GlyphSlot slot = (TT_GlyphSlot)ttslot;
359 TT_Size size = (TT_Size)ttsize;
360 FT_Face face = ttslot->face;
365 return FT_THROW( Invalid_Slot_Handle );
368 return FT_THROW( Invalid_Size_Handle );
371 return FT_THROW( Invalid_Face_Handle );
373 #ifdef FT_CONFIG_OPTION_INCREMENTAL
374 if ( glyph_index >= (FT_UInt)face->num_glyphs &&
375 !face->internal->incremental_interface )
377 if ( glyph_index >= (FT_UInt)face->num_glyphs )
379 return FT_THROW( Invalid_Argument );
381 if ( load_flags & FT_LOAD_NO_HINTING )
383 /* both FT_LOAD_NO_HINTING and FT_LOAD_NO_AUTOHINT */
384 /* are necessary to disable hinting for tricky fonts */
386 if ( FT_IS_TRICKY( face ) )
387 load_flags &= ~FT_LOAD_NO_HINTING;
389 if ( load_flags & FT_LOAD_NO_AUTOHINT )
390 load_flags |= FT_LOAD_NO_HINTING;
393 if ( load_flags & ( FT_LOAD_NO_RECURSE | FT_LOAD_NO_SCALE ) )
395 load_flags |= FT_LOAD_NO_BITMAP | FT_LOAD_NO_SCALE;
397 if ( !FT_IS_TRICKY( face ) )
398 load_flags |= FT_LOAD_NO_HINTING;
401 /* now load the glyph outline if necessary */
402 error = TT_Load_Glyph( size, slot, glyph_index, load_flags );
404 /* force drop-out mode to 2 - irrelevant now */
405 /* slot->outline.dropout_mode = 2; */
411 /*************************************************************************/
412 /*************************************************************************/
413 /*************************************************************************/
416 /**** D R I V E R I N T E R F A C E ****/
419 /*************************************************************************/
420 /*************************************************************************/
421 /*************************************************************************/
423 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
424 FT_DEFINE_SERVICE_MULTIMASTERSREC(
425 tt_service_gx_multi_masters,
426 (FT_Get_MM_Func) NULL, /* get_mm */
427 (FT_Set_MM_Design_Func) NULL, /* set_mm_design */
428 (FT_Set_MM_Blend_Func) TT_Set_MM_Blend, /* set_mm_blend */
429 (FT_Get_MM_Var_Func) TT_Get_MM_Var, /* get_mm_var */
430 (FT_Set_Var_Design_Func)TT_Set_Var_Design ) /* set_var_design */
434 static const FT_Service_TrueTypeEngineRec tt_service_truetype_engine =
436 #ifdef TT_USE_BYTECODE_INTERPRETER
438 FT_TRUETYPE_ENGINE_TYPE_PATENTED
440 #else /* !TT_USE_BYTECODE_INTERPRETER */
442 FT_TRUETYPE_ENGINE_TYPE_NONE
444 #endif /* TT_USE_BYTECODE_INTERPRETER */
448 FT_DEFINE_SERVICE_TTGLYFREC(
449 tt_service_truetype_glyf,
450 (TT_Glyf_GetLocationFunc)tt_face_get_location ) /* get_location */
453 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
454 FT_DEFINE_SERVICEDESCREC5(
456 FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_TRUETYPE,
457 FT_SERVICE_ID_MULTI_MASTERS, &TT_SERVICE_GX_MULTI_MASTERS_GET,
458 FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine,
459 FT_SERVICE_ID_TT_GLYF, &TT_SERVICE_TRUETYPE_GLYF_GET,
460 FT_SERVICE_ID_PROPERTIES, &TT_SERVICE_PROPERTIES_GET )
462 FT_DEFINE_SERVICEDESCREC4(
464 FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_TRUETYPE,
465 FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine,
466 FT_SERVICE_ID_TT_GLYF, &TT_SERVICE_TRUETYPE_GLYF_GET,
467 FT_SERVICE_ID_PROPERTIES, &TT_SERVICE_PROPERTIES_GET )
471 FT_CALLBACK_DEF( FT_Module_Interface )
472 tt_get_interface( FT_Module driver, /* TT_Driver */
473 const char* tt_interface )
476 FT_Module_Interface result;
481 /* TT_SERVICES_GET dereferences `library' in PIC mode */
482 #ifdef FT_CONFIG_OPTION_PIC
485 library = driver->library;
490 result = ft_service_list_lookup( TT_SERVICES_GET, tt_interface );
491 if ( result != NULL )
494 #ifndef FT_CONFIG_OPTION_PIC
497 library = driver->library;
502 /* only return the default interface from the SFNT module */
503 sfntd = FT_Get_Module( library, "sfnt" );
506 sfnt = (SFNT_Service)( sfntd->clazz->module_interface );
508 return sfnt->get_interface( driver, tt_interface );
515 /* The FT_DriverInterface structure is defined in ftdriver.h. */
517 #ifdef TT_USE_BYTECODE_INTERPRETER
518 #define TT_HINTER_FLAG FT_MODULE_DRIVER_HAS_HINTER
520 #define TT_HINTER_FLAG 0
523 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
524 #define TT_SIZE_SELECT tt_size_select
526 #define TT_SIZE_SELECT 0
532 FT_MODULE_FONT_DRIVER |
533 FT_MODULE_DRIVER_SCALABLE |
536 sizeof ( TT_DriverRec ),
538 "truetype", /* driver name */
539 0x10000L, /* driver version == 1.0 */
540 0x20000L, /* driver requires FreeType 2.0 or above */
542 0, /* module-specific interface */
544 tt_driver_init, /* FT_Module_Constructor module_init */
545 tt_driver_done, /* FT_Module_Destructor module_done */
546 tt_get_interface, /* FT_Module_Requester get_interface */
548 sizeof ( TT_FaceRec ),
549 sizeof ( TT_SizeRec ),
550 sizeof ( FT_GlyphSlotRec ),
552 tt_face_init, /* FT_Face_InitFunc init_face */
553 tt_face_done, /* FT_Face_DoneFunc done_face */
554 tt_size_init, /* FT_Size_InitFunc init_size */
555 tt_size_done, /* FT_Size_DoneFunc done_size */
556 tt_slot_init, /* FT_Slot_InitFunc init_slot */
557 0, /* FT_Slot_DoneFunc done_slot */
559 tt_glyph_load, /* FT_Slot_LoadFunc load_glyph */
561 tt_get_kerning, /* FT_Face_GetKerningFunc get_kerning */
562 0, /* FT_Face_AttachFunc attach_file */
563 tt_get_advances, /* FT_Face_GetAdvancesFunc get_advances */
565 tt_size_request, /* FT_Size_RequestFunc request_size */
566 TT_SIZE_SELECT /* FT_Size_SelectFunc select_size */