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ttdriver.c

Last change on this file was 2, checked in by jglee, 11 years ago
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1	/***************************************************************************/
2	/* */
3	/* ttdriver.c */
4	/* */
5	/* TrueType font driver implementation (body). */
6	/* */
7	/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by */
8	/* David Turner, Robert Wilhelm, and Werner Lemberg. */
9	/* */
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. */
15	/* */
16	/***************************************************************************/
17
18
19	#include <ft2build.h>
20	#include FT_INTERNAL_DEBUG_H
21	#include FT_INTERNAL_STREAM_H
22	#include FT_INTERNAL_SFNT_H
23	#include FT_TRUETYPE_IDS_H
24	#include FT_SERVICE_XFREE86_NAME_H
25
26	#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
27	#include FT_MULTIPLE_MASTERS_H
28	#include FT_SERVICE_MULTIPLE_MASTERS_H
29	#endif
30
31	#include FT_SERVICE_TRUETYPE_ENGINE_H
32	#include FT_SERVICE_TRUETYPE_GLYF_H
33
34	#include "ttdriver.h"
35	#include "ttgload.h"
36	#include "ttpload.h"
37
38	#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
39	#include "ttgxvar.h"
40	#endif
41
42	#include "tterrors.h"
43
44
45	/*************************************************************************/
46	/* */
47	/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
48	/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
49	/* messages during execution. */
50	/* */
51	#undef FT_COMPONENT
52	#define FT_COMPONENT trace_ttdriver
53
54
55	/*************************************************************************/
56	/*************************************************************************/
57	/*************************************************************************/
58	/** **/
59	/** **/
60	/** F A C E S **/
61	/** **/
62	/** **/
63	/*************************************************************************/
64	/*************************************************************************/
65	/*************************************************************************/
66
67
68	#undef PAIR_TAG
69	#define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) \| \
70	(FT_ULong)right )
71
72
73	/*************************************************************************/
74	/* */
75	/* <Function> */
76	/* tt_get_kerning */
77	/* */
78	/* <Description> */
79	/* A driver method used to return the kerning vector between two */
80	/* glyphs of the same face. */
81	/* */
82	/* <Input> */
83	/* face :: A handle to the source face object. */
84	/* */
85	/* left_glyph :: The index of the left glyph in the kern pair. */
86	/* */
87	/* right_glyph :: The index of the right glyph in the kern pair. */
88	/* */
89	/* <Output> */
90	/* kerning :: The kerning vector. This is in font units for */
91	/* scalable formats, and in pixels for fixed-sizes */
92	/* formats. */
93	/* */
94	/* <Return> */
95	/* FreeType error code. 0 means success. */
96	/* */
97	/* <Note> */
98	/* Only horizontal layouts (left-to-right & right-to-left) are */
99	/* supported by this function. Other layouts, or more sophisticated */
100	/* kernings, are out of scope of this method (the basic driver */
101	/* interface is meant to be simple). */
102	/* */
103	/* They can be implemented by format-specific interfaces. */
104	/* */
105	static FT_Error
106	tt_get_kerning( FT_Face ttface, /* TT_Face */
107	FT_UInt left_glyph,
108	FT_UInt right_glyph,
109	FT_Vector* kerning )
110	{
111	TT_Face face = (TT_Face)ttface;
112	SFNT_Service sfnt = (SFNT_Service)face->sfnt;
113
114
115	kerning->x = 0;
116	kerning->y = 0;
117
118	if ( sfnt )
119	kerning->x = sfnt->get_kerning( face, left_glyph, right_glyph );
120
121	return 0;
122	}
123
124
125	#undef PAIR_TAG
126
127
128	static FT_Error
129	tt_get_advances( FT_Face ttface,
130	FT_UInt start,
131	FT_UInt count,
132	FT_Int32 flags,
133	FT_Fixed *advances )
134	{
135	FT_UInt nn;
136	TT_Face face = (TT_Face) ttface;
137	FT_Bool check = FT_BOOL(
138	!( flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) );
139
140
141	/* XXX: TODO: check for sbits */
142
143	if ( flags & FT_LOAD_VERTICAL_LAYOUT )
144	{
145	for ( nn = 0; nn < count; nn++ )
146	{
147	FT_Short tsb;
148	FT_UShort ah;
149
150
151	TT_Get_VMetrics( face, start + nn, check, &tsb, &ah );
152	advances[nn] = ah;
153	}
154	}
155	else
156	{
157	for ( nn = 0; nn < count; nn++ )
158	{
159	FT_Short lsb;
160	FT_UShort aw;
161
162
163	TT_Get_HMetrics( face, start + nn, check, &lsb, &aw );
164	advances[nn] = aw;
165	}
166	}
167
168	return TT_Err_Ok;
169	}
170
171	/*************************************************************************/
172	/*************************************************************************/
173	/*************************************************************************/
174	/** **/
175	/** **/
176	/** S I Z E S **/
177	/** **/
178	/** **/
179	/*************************************************************************/
180	/*************************************************************************/
181	/*************************************************************************/
182
183
184	#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
185
186	static FT_Error
187	tt_size_select( FT_Size size,
188	FT_ULong strike_index )
189	{
190	TT_Face ttface = (TT_Face)size->face;
191	TT_Size ttsize = (TT_Size)size;
192	FT_Error error = TT_Err_Ok;
193
194
195	ttsize->strike_index = strike_index;
196
197	if ( FT_IS_SCALABLE( size->face ) )
198	{
199	/* use the scaled metrics, even when tt_size_reset fails */
200	FT_Select_Metrics( size->face, strike_index );
201
202	tt_size_reset( ttsize );
203	}
204	else
205	{
206	SFNT_Service sfnt = (SFNT_Service) ttface->sfnt;
207	FT_Size_Metrics* metrics = &size->metrics;
208
209
210	error = sfnt->load_strike_metrics( ttface, strike_index, metrics );
211	if ( error )
212	ttsize->strike_index = 0xFFFFFFFFUL;
213	}
214
215	return error;
216	}
217
218	#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
219
220
221	static FT_Error
222	tt_size_request( FT_Size size,
223	FT_Size_Request req )
224	{
225	TT_Size ttsize = (TT_Size)size;
226	FT_Error error = TT_Err_Ok;
227
228
229	#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
230
231	if ( FT_HAS_FIXED_SIZES( size->face ) )
232	{
233	TT_Face ttface = (TT_Face)size->face;
234	SFNT_Service sfnt = (SFNT_Service) ttface->sfnt;
235	FT_ULong strike_index;
236
237
238	error = sfnt->set_sbit_strike( ttface, req, &strike_index );
239
240	if ( error )
241	ttsize->strike_index = 0xFFFFFFFFUL;
242	else
243	return tt_size_select( size, strike_index );
244	}
245
246	#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
247
248	FT_Request_Metrics( size->face, req );
249
250	if ( FT_IS_SCALABLE( size->face ) )
251	error = tt_size_reset( ttsize );
252
253	return error;
254	}
255
256
257	/*************************************************************************/
258	/* */
259	/* <Function> */
260	/* Load_Glyph */
261	/* */
262	/* <Description> */
263	/* A driver method used to load a glyph within a given glyph slot. */
264	/* */
265	/* <Input> */
266	/* slot :: A handle to the target slot object where the glyph */
267	/* will be loaded. */
268	/* */
269	/* size :: A handle to the source face size at which the glyph */
270	/* must be scaled, loaded, etc. */
271	/* */
272	/* glyph_index :: The index of the glyph in the font file. */
273	/* */
274	/* load_flags :: A flag indicating what to load for this glyph. The */
275	/* FT_LOAD_XXX constants can be used to control the */
276	/* glyph loading process (e.g., whether the outline */
277	/* should be scaled, whether to load bitmaps or not, */
278	/* whether to hint the outline, etc). */
279	/* */
280	/* <Return> */
281	/* FreeType error code. 0 means success. */
282	/* */
283	static FT_Error
284	Load_Glyph( FT_GlyphSlot ttslot, /* TT_GlyphSlot */
285	FT_Size ttsize, /* TT_Size */
286	FT_UInt glyph_index,
287	FT_Int32 load_flags )
288	{
289	TT_GlyphSlot slot = (TT_GlyphSlot)ttslot;
290	TT_Size size = (TT_Size)ttsize;
291	FT_Face face = ttslot->face;
292	FT_Error error;
293
294
295	if ( !slot )
296	return TT_Err_Invalid_Slot_Handle;
297
298	if ( !size )
299	return TT_Err_Invalid_Size_Handle;
300
301	if ( !face \|\| glyph_index >= (FT_UInt)face->num_glyphs )
302	return TT_Err_Invalid_Argument;
303
304	if ( load_flags & FT_LOAD_NO_HINTING )
305	{
306	/* both FT_LOAD_NO_HINTING and FT_LOAD_NO_AUTOHINT */
307	/* are necessary to disable hinting for tricky fonts */
308
309	if ( FT_IS_TRICKY( face ) )
310	load_flags &= ~FT_LOAD_NO_HINTING;
311
312	if ( load_flags & FT_LOAD_NO_AUTOHINT )
313	load_flags \|= FT_LOAD_NO_HINTING;
314	}
315
316	if ( load_flags & ( FT_LOAD_NO_RECURSE \| FT_LOAD_NO_SCALE ) )
317	{
318	load_flags \|= FT_LOAD_NO_BITMAP \| FT_LOAD_NO_SCALE;
319
320	if ( !FT_IS_TRICKY( face ) )
321	load_flags \|= FT_LOAD_NO_HINTING;
322	}
323
324	/* now load the glyph outline if necessary */
325	error = TT_Load_Glyph( size, slot, glyph_index, load_flags );
326
327	/* force drop-out mode to 2 - irrelevant now */
328	/* slot->outline.dropout_mode = 2; */
329
330	return error;
331	}
332
333
334	/*************************************************************************/
335	/*************************************************************************/
336	/*************************************************************************/
337	/** **/
338	/** **/
339	/** D R I V E R I N T E R F A C E **/
340	/** **/
341	/** **/
342	/*************************************************************************/
343	/*************************************************************************/
344	/*************************************************************************/
345
346	#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
347	static const FT_Service_MultiMastersRec tt_service_gx_multi_masters =
348	{
349	(FT_Get_MM_Func) NULL,
350	(FT_Set_MM_Design_Func) NULL,
351	(FT_Set_MM_Blend_Func) TT_Set_MM_Blend,
352	(FT_Get_MM_Var_Func) TT_Get_MM_Var,
353	(FT_Set_Var_Design_Func)TT_Set_Var_Design
354	};
355	#endif
356
357	static const FT_Service_TrueTypeEngineRec tt_service_truetype_engine =
358	{
359	#ifdef TT_USE_BYTECODE_INTERPRETER
360
361	#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
362	FT_TRUETYPE_ENGINE_TYPE_UNPATENTED
363	#else
364	FT_TRUETYPE_ENGINE_TYPE_PATENTED
365	#endif
366
367	#else /* !TT_USE_BYTECODE_INTERPRETER */
368
369	FT_TRUETYPE_ENGINE_TYPE_NONE
370
371	#endif /* TT_USE_BYTECODE_INTERPRETER */
372	};
373
374	static const FT_Service_TTGlyfRec tt_service_truetype_glyf =
375	{
376	(TT_Glyf_GetLocationFunc)tt_face_get_location
377	};
378
379	static const FT_ServiceDescRec tt_services[] =
380	{
381	{ FT_SERVICE_ID_XF86_NAME, FT_XF86_FORMAT_TRUETYPE },
382	#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
383	{ FT_SERVICE_ID_MULTI_MASTERS, &tt_service_gx_multi_masters },
384	#endif
385	{ FT_SERVICE_ID_TRUETYPE_ENGINE, &tt_service_truetype_engine },
386	{ FT_SERVICE_ID_TT_GLYF, &tt_service_truetype_glyf },
387	{ NULL, NULL }
388	};
389
390
391	FT_CALLBACK_DEF( FT_Module_Interface )
392	tt_get_interface( FT_Module driver, /* TT_Driver */
393	const char* tt_interface )
394	{
395	FT_Module_Interface result;
396	FT_Module sfntd;
397	SFNT_Service sfnt;
398
399
400	result = ft_service_list_lookup( tt_services, tt_interface );
401	if ( result != NULL )
402	return result;
403
404	/* only return the default interface from the SFNT module */
405	sfntd = FT_Get_Module( driver->library, "sfnt" );
406	if ( sfntd )
407	{
408	sfnt = (SFNT_Service)( sfntd->clazz->module_interface );
409	if ( sfnt )
410	return sfnt->get_interface( driver, tt_interface );
411	}
412
413	return 0;
414	}
415
416
417	/* The FT_DriverInterface structure is defined in ftdriver.h. */
418
419	FT_CALLBACK_TABLE_DEF
420	const FT_Driver_ClassRec tt_driver_class =
421	{
422	{
423	FT_MODULE_FONT_DRIVER \|
424	FT_MODULE_DRIVER_SCALABLE \|
425	#ifdef TT_USE_BYTECODE_INTERPRETER
426	FT_MODULE_DRIVER_HAS_HINTER,
427	#else
428	0,
429	#endif
430
431	sizeof ( TT_DriverRec ),
432
433	"truetype", /* driver name */
434	0x10000L, /* driver version == 1.0 */
435	0x20000L, /* driver requires FreeType 2.0 or above */
436
437	(void)0, / driver specific interface */
438
439	tt_driver_init,
440	tt_driver_done,
441	tt_get_interface,
442	},
443
444	sizeof ( TT_FaceRec ),
445	sizeof ( TT_SizeRec ),
446	sizeof ( FT_GlyphSlotRec ),
447
448	tt_face_init,
449	tt_face_done,
450	tt_size_init,
451	tt_size_done,
452	tt_slot_init,
453	0, /* FT_Slot_DoneFunc */
454
455	#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
456	ft_stub_set_char_sizes,
457	ft_stub_set_pixel_sizes,
458	#endif
459	Load_Glyph,
460
461	tt_get_kerning,
462	0, /* FT_Face_AttachFunc */
463	tt_get_advances,
464
465	tt_size_request,
466	#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
467	tt_size_select
468	#else
469	0 /* FT_Size_SelectFunc */
470	#endif
471	};
472
473
474	/* END */

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source: svn/trunk/zasc/freetype-2.3.9/ttdriver.c

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