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1 /***************************************************************************/
2 /* */
3 /* t2driver.c */
4 /* */
5 /* OpenType font driver implementation (body). */
6 /* */
7 /* Copyright 1996-2000 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 <freetype/freetype.h>
20 #include <freetype/internal/ftdebug.h>
21 #include <freetype/internal/ftstream.h>
22 #include <freetype/internal/sfnt.h>
23 #include <freetype/ttnameid.h>
24
25 #include <freetype/internal/t2errors.h>
26
27
28 #ifdef FT_FLAT_COMPILE
29
30 #include "t2driver.h"
31 #include "t2gload.h"
32
33 #else
34
35 #include <cff/t2driver.h>
36 #include <cff/t2gload.h>
37
38 #endif
39
40
41 /*************************************************************************/
42 /* */
43 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
44 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
45 /* messages during execution. */
46 /* */
47 #undef FT_COMPONENT
48 #define FT_COMPONENT trace_t2driver
49
50
51 /*************************************************************************/
52 /*************************************************************************/
53 /*************************************************************************/
54 /**** ****/
55 /**** ****/
56 /**** F A C E S ****/
57 /**** ****/
58 /**** ****/
59 /*************************************************************************/
60 /*************************************************************************/
61 /*************************************************************************/
62
63
64 #undef PAIR_TAG
65 #define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \
66 (FT_ULong)right )
67
68
69 /*************************************************************************/
70 /* */
71 /* <Function> */
72 /* Get_Kerning */
73 /* */
74 /* <Description> */
75 /* A driver method used to return the kerning vector between two */
76 /* glyphs of the same face. */
77 /* */
78 /* <Input> */
79 /* face :: A handle to the source face object. */
80 /* */
81 /* left_glyph :: The index of the left glyph in the kern pair. */
82 /* */
83 /* right_glyph :: The index of the right glyph in the kern pair. */
84 /* */
85 /* <Output> */
86 /* kerning :: The kerning vector. This is in font units for */
87 /* scalable formats, and in pixels for fixed-sizes */
88 /* formats. */
89 /* */
90 /* <Return> */
91 /* FreeType error code. 0 means success. */
92 /* */
93 /* <Note> */
94 /* Only horizontal layouts (left-to-right & right-to-left) are */
95 /* supported by this function. Other layouts, or more sophisticated */
96 /* kernings, are out of scope of this method (the basic driver */
97 /* interface is meant to be simple). */
98 /* */
99 /* They can be implemented by format-specific interfaces. */
100 /* */
101 static
102 FT_Error Get_Kerning( TT_Face face,
103 FT_UInt left_glyph,
104 FT_UInt right_glyph,
105 FT_Vector* kerning )
106 {
107 TT_Kern_0_Pair* pair;
108
109
110 if ( !face )
111 return T2_Err_Invalid_Face_Handle;
112
113 kerning->x = 0;
114 kerning->y = 0;
115
116 if ( face->kern_pairs )
117 {
118 /* there are some kerning pairs in this font file! */
119 FT_ULong search_tag = PAIR_TAG( left_glyph, right_glyph );
120 FT_Long left, right;
121
122
123 left = 0;
124 right = face->num_kern_pairs - 1;
125
126 while ( left <= right )
127 {
128 FT_Int middle = left + ( ( right - left ) >> 1 );
129 FT_ULong cur_pair;
130
131
132 pair = face->kern_pairs + middle;
133 cur_pair = PAIR_TAG( pair->left, pair->right );
134
135 if ( cur_pair == search_tag )
136 goto Found;
137
138 if ( cur_pair < search_tag )
139 left = middle + 1;
140 else
141 right = middle - 1;
142 }
143 }
144
145 Exit:
146 return T2_Err_Ok;
147
148 Found:
149 kerning->x = pair->value;
150 goto Exit;
151 }
152
153
154 #undef PAIR_TAG
155
156
157 /*************************************************************************/
158 /* */
159 /* <Function> */
160 /* Load_Glyph */
161 /* */
162 /* <Description> */
163 /* A driver method used to load a glyph within a given glyph slot. */
164 /* */
165 /* <Input> */
166 /* slot :: A handle to the target slot object where the glyph */
167 /* will be loaded. */
168 /* */
169 /* size :: A handle to the source face size at which the glyph */
170 /* must be scaled, loaded, etc. */
171 /* */
172 /* glyph_index :: The index of the glyph in the font file. */
173 /* */
174 /* load_flags :: A flag indicating what to load for this glyph. The */
175 /* FTLOAD_??? constants can be used to control the */
176 /* glyph loading process (e.g., whether the outline */
177 /* should be scaled, whether to load bitmaps or not, */
178 /* whether to hint the outline, etc). */
179 /* */
180 /* <Return> */
181 /* FreeType error code. 0 means success. */
182 /* */
183 static
184 FT_Error Load_Glyph( T2_GlyphSlot slot,
185 T2_Size size,
186 FT_UShort glyph_index,
187 FT_UInt load_flags )
188 {
189 FT_Error error;
190
191
192 if ( !slot )
193 return T2_Err_Invalid_Glyph_Handle;
194
195 /* check whether we want a scaled outline or bitmap */
196 if ( !size )
197 load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
198
199 if ( load_flags & FT_LOAD_NO_SCALE )
200 size = NULL;
201
202 /* reset the size object if necessary */
203 if ( size )
204 {
205 /* these two object must have the same parent */
206 if ( size->face != slot->root.face )
207 return T2_Err_Invalid_Face_Handle;
208 }
209
210 /* now load the glyph outline if necessary */
211 error = T2_Load_Glyph( slot, size, glyph_index, load_flags );
212
213 /* force drop-out mode to 2 - irrelevant now */
214 /* slot->outline.dropout_mode = 2; */
215
216 return error;
217 }
218
219
220 /*************************************************************************/
221 /*************************************************************************/
222 /*************************************************************************/
223 /**** ****/
224 /**** ****/
225 /**** C H A R A C T E R M A P P I N G S ****/
226 /**** ****/
227 /**** ****/
228 /*************************************************************************/
229 /*************************************************************************/
230 /*************************************************************************/
231
232 /*************************************************************************/
233 /* */
234 /* <Function> */
235 /* Get_Char_Index */
236 /* */
237 /* <Description> */
238 /* Uses a charmap to return a given character code's glyph index. */
239 /* */
240 /* <Input> */
241 /* charmap :: A handle to the source charmap object. */
242 /* charcode :: The character code. */
243 /* */
244 /* <Return> */
245 /* Glyph index. 0 means `undefined character code'. */
246 /* */
247 static
248 FT_UInt t2_get_char_index( TT_CharMap charmap,
249 FT_Long charcode )
250 {
251 FT_Error error;
252 T2_Face face;
253 TT_CMapTable* cmap;
254
255
256 cmap = &charmap->cmap;
257 face = (T2_Face)charmap->root.face;
258
259 /* Load table if needed */
260 if ( !cmap->loaded )
261 {
262 SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt;
263
264
265 error = sfnt->load_charmap( face, cmap, face->root.stream );
266 if ( error )
267 return 0;
268
269 cmap->loaded = TRUE;
270 }
271
272 return ( cmap->get_index ? cmap->get_index( cmap, charcode ) : 0 );
273 }
274
275
276 /*************************************************************************/
277 /*************************************************************************/
278 /*************************************************************************/
279 /**** ****/
280 /**** ****/
281 /**** D R I V E R I N T E R F A C E ****/
282 /**** ****/
283 /**** ****/
284 /*************************************************************************/
285 /*************************************************************************/
286 /*************************************************************************/
287
288
289 static
290 FT_Module_Interface t2_get_interface( T2_Driver driver,
291 const char* interface )
292 {
293 FT_Module sfnt;
294
295
296 /* we simply pass our request to the `sfnt' module */
297 sfnt = FT_Get_Module( driver->root.root.library, "sfnt" );
298
299 return sfnt ? sfnt->clazz->get_interface( sfnt, interface ) : 0;
300 }
301
302
303 /* The FT_DriverInterface structure is defined in ftdriver.h. */
304
305 const FT_Driver_Class cff_driver_class =
306 {
307 /* begin with the FT_Module_Class fields */
308 {
309 ft_module_font_driver | ft_module_driver_scalable,
310 sizeof( T2_DriverRec ),
311 "cff",
312 0x10000L,
313 0x20000L,
314
315 0, /* module-specific interface */
316
317 (FT_Module_Constructor)T2_Init_Driver,
318 (FT_Module_Destructor) T2_Done_Driver,
319 (FT_Module_Requester) t2_get_interface,
320 },
321
322 /* now the specific driver fields */
323 sizeof( TT_FaceRec ),
324 sizeof( FT_SizeRec ),
325 sizeof( T2_GlyphSlotRec ),
326
327 (FTDriver_initFace) T2_Init_Face,
328 (FTDriver_doneFace) T2_Done_Face,
329 (FTDriver_initSize) 0,
330 (FTDriver_doneSize) 0,
331 (FTDriver_initGlyphSlot)0,
332 (FTDriver_doneGlyphSlot)0,
333
334 (FTDriver_setCharSizes) 0,
335 (FTDriver_setPixelSizes)0,
336
337 (FTDriver_loadGlyph) Load_Glyph,
338 (FTDriver_getCharIndex) t2_get_char_index,
339
340 (FTDriver_getKerning) Get_Kerning,
341 (FTDriver_attachFile) 0,
342 (FTDriver_getAdvances) 0
343 };
344
345
346 #ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS
347
348
349 /*************************************************************************/
350 /* */
351 /* <Function> */
352 /* getDriverClass */
353 /* */
354 /* <Description> */
355 /* This function is used when compiling the TrueType driver as a */
356 /* shared library (`.DLL' or `.so'). It will be used by the */
357 /* high-level library of FreeType to retrieve the address of the */
358 /* driver's generic interface. */
359 /* */
360 /* It shouldn't be implemented in a static build, as each driver must */
361 /* have the same function as an exported entry point. */
362 /* */
363 /* <Return> */
364 /* The address of the TrueType's driver generic interface. The */
365 /* format-specific interface can then be retrieved through the method */
366 /* interface->get_format_interface. */
367 /* */
368 EXPORT_FUNC( FT_Driver_Class* ) getDriverClass( void )
369 {
370 return &cff_driver_class;
371 }
372
373
374 #endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */
375
376
377 /* END */
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