|
1 /***************************************************************************/ |
|
2 /* */ |
|
3 /* afglobal.c */ |
|
4 /* */ |
|
5 /* Auto-fitter routines to compute global hinting values (body). */ |
|
6 /* */ |
|
7 /* Copyright 2003-2011 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 "afglobal.h" |
|
20 #include "afdummy.h" |
|
21 #include "aflatin.h" |
|
22 #include "afcjk.h" |
|
23 #include "afindic.h" |
|
24 #include "afpic.h" |
|
25 |
|
26 #include "aferrors.h" |
|
27 |
|
28 #ifdef FT_OPTION_AUTOFIT2 |
|
29 #include "aflatin2.h" |
|
30 #endif |
|
31 |
|
32 #ifndef FT_CONFIG_OPTION_PIC |
|
33 |
|
34 /* when updating this table, don't forget to update */ |
|
35 /* AF_SCRIPT_CLASSES_COUNT and autofit_module_class_pic_init */ |
|
36 |
|
37 /* populate this list when you add new scripts */ |
|
38 static AF_ScriptClass const af_script_classes[] = |
|
39 { |
|
40 &af_dummy_script_class, |
|
41 #ifdef FT_OPTION_AUTOFIT2 |
|
42 &af_latin2_script_class, |
|
43 #endif |
|
44 &af_latin_script_class, |
|
45 &af_cjk_script_class, |
|
46 &af_indic_script_class, |
|
47 NULL /* do not remove */ |
|
48 }; |
|
49 |
|
50 #endif /* !FT_CONFIG_OPTION_PIC */ |
|
51 |
|
52 /* index of default script in `af_script_classes' */ |
|
53 #define AF_SCRIPT_LIST_DEFAULT 2 |
|
54 /* a bit mask indicating an uncovered glyph */ |
|
55 #define AF_SCRIPT_LIST_NONE 0x7F |
|
56 /* if this flag is set, we have an ASCII digit */ |
|
57 #define AF_DIGIT 0x80 |
|
58 |
|
59 |
|
60 /* |
|
61 * Note that glyph_scripts[] is used to map each glyph into |
|
62 * an index into the `af_script_classes' array. |
|
63 * |
|
64 */ |
|
65 typedef struct AF_FaceGlobalsRec_ |
|
66 { |
|
67 FT_Face face; |
|
68 FT_Long glyph_count; /* same as face->num_glyphs */ |
|
69 FT_Byte* glyph_scripts; |
|
70 |
|
71 AF_ScriptMetrics metrics[AF_SCRIPT_MAX]; |
|
72 |
|
73 } AF_FaceGlobalsRec; |
|
74 |
|
75 |
|
76 /* Compute the script index of each glyph within a given face. */ |
|
77 |
|
78 static FT_Error |
|
79 af_face_globals_compute_script_coverage( AF_FaceGlobals globals ) |
|
80 { |
|
81 FT_Error error = AF_Err_Ok; |
|
82 FT_Face face = globals->face; |
|
83 FT_CharMap old_charmap = face->charmap; |
|
84 FT_Byte* gscripts = globals->glyph_scripts; |
|
85 FT_UInt ss, i; |
|
86 |
|
87 |
|
88 /* the value AF_SCRIPT_LIST_NONE means `uncovered glyph' */ |
|
89 FT_MEM_SET( globals->glyph_scripts, |
|
90 AF_SCRIPT_LIST_NONE, |
|
91 globals->glyph_count ); |
|
92 |
|
93 error = FT_Select_Charmap( face, FT_ENCODING_UNICODE ); |
|
94 if ( error ) |
|
95 { |
|
96 /* |
|
97 * Ignore this error; we simply use the default script. |
|
98 * XXX: Shouldn't we rather disable hinting? |
|
99 */ |
|
100 error = AF_Err_Ok; |
|
101 goto Exit; |
|
102 } |
|
103 |
|
104 /* scan each script in a Unicode charmap */ |
|
105 for ( ss = 0; AF_SCRIPT_CLASSES_GET[ss]; ss++ ) |
|
106 { |
|
107 AF_ScriptClass clazz = AF_SCRIPT_CLASSES_GET[ss]; |
|
108 AF_Script_UniRange range; |
|
109 |
|
110 |
|
111 if ( clazz->script_uni_ranges == NULL ) |
|
112 continue; |
|
113 |
|
114 /* |
|
115 * Scan all unicode points in the range and set the corresponding |
|
116 * glyph script index. |
|
117 */ |
|
118 for ( range = clazz->script_uni_ranges; range->first != 0; range++ ) |
|
119 { |
|
120 FT_ULong charcode = range->first; |
|
121 FT_UInt gindex; |
|
122 |
|
123 |
|
124 gindex = FT_Get_Char_Index( face, charcode ); |
|
125 |
|
126 if ( gindex != 0 && |
|
127 gindex < (FT_ULong)globals->glyph_count && |
|
128 gscripts[gindex] == AF_SCRIPT_LIST_NONE ) |
|
129 gscripts[gindex] = (FT_Byte)ss; |
|
130 |
|
131 for (;;) |
|
132 { |
|
133 charcode = FT_Get_Next_Char( face, charcode, &gindex ); |
|
134 |
|
135 if ( gindex == 0 || charcode > range->last ) |
|
136 break; |
|
137 |
|
138 if ( gindex < (FT_ULong)globals->glyph_count && |
|
139 gscripts[gindex] == AF_SCRIPT_LIST_NONE ) |
|
140 gscripts[gindex] = (FT_Byte)ss; |
|
141 } |
|
142 } |
|
143 } |
|
144 |
|
145 /* mark ASCII digits */ |
|
146 for ( i = 0x30; i <= 0x39; i++ ) |
|
147 { |
|
148 FT_UInt gindex = FT_Get_Char_Index( face, i ); |
|
149 |
|
150 |
|
151 if ( gindex != 0 && gindex < (FT_ULong)globals->glyph_count ) |
|
152 gscripts[gindex] |= AF_DIGIT; |
|
153 } |
|
154 |
|
155 Exit: |
|
156 /* |
|
157 * By default, all uncovered glyphs are set to the latin script. |
|
158 * XXX: Shouldn't we disable hinting or do something similar? |
|
159 */ |
|
160 { |
|
161 FT_Long nn; |
|
162 |
|
163 |
|
164 for ( nn = 0; nn < globals->glyph_count; nn++ ) |
|
165 { |
|
166 if ( ( gscripts[nn] & ~AF_DIGIT ) == AF_SCRIPT_LIST_NONE ) |
|
167 { |
|
168 gscripts[nn] &= ~AF_SCRIPT_LIST_NONE; |
|
169 gscripts[nn] |= AF_SCRIPT_LIST_DEFAULT; |
|
170 } |
|
171 } |
|
172 } |
|
173 |
|
174 FT_Set_Charmap( face, old_charmap ); |
|
175 return error; |
|
176 } |
|
177 |
|
178 |
|
179 FT_LOCAL_DEF( FT_Error ) |
|
180 af_face_globals_new( FT_Face face, |
|
181 AF_FaceGlobals *aglobals ) |
|
182 { |
|
183 FT_Error error; |
|
184 FT_Memory memory; |
|
185 AF_FaceGlobals globals = NULL; |
|
186 |
|
187 |
|
188 memory = face->memory; |
|
189 |
|
190 if ( !FT_ALLOC( globals, sizeof ( *globals ) + |
|
191 face->num_glyphs * sizeof ( FT_Byte ) ) ) |
|
192 { |
|
193 globals->face = face; |
|
194 globals->glyph_count = face->num_glyphs; |
|
195 globals->glyph_scripts = (FT_Byte*)( globals + 1 ); |
|
196 |
|
197 error = af_face_globals_compute_script_coverage( globals ); |
|
198 if ( error ) |
|
199 { |
|
200 af_face_globals_free( globals ); |
|
201 globals = NULL; |
|
202 } |
|
203 } |
|
204 |
|
205 *aglobals = globals; |
|
206 return error; |
|
207 } |
|
208 |
|
209 |
|
210 FT_LOCAL_DEF( void ) |
|
211 af_face_globals_free( AF_FaceGlobals globals ) |
|
212 { |
|
213 if ( globals ) |
|
214 { |
|
215 FT_Memory memory = globals->face->memory; |
|
216 FT_UInt nn; |
|
217 |
|
218 |
|
219 for ( nn = 0; nn < AF_SCRIPT_MAX; nn++ ) |
|
220 { |
|
221 if ( globals->metrics[nn] ) |
|
222 { |
|
223 AF_ScriptClass clazz = AF_SCRIPT_CLASSES_GET[nn]; |
|
224 |
|
225 |
|
226 FT_ASSERT( globals->metrics[nn]->clazz == clazz ); |
|
227 |
|
228 if ( clazz->script_metrics_done ) |
|
229 clazz->script_metrics_done( globals->metrics[nn] ); |
|
230 |
|
231 FT_FREE( globals->metrics[nn] ); |
|
232 } |
|
233 } |
|
234 |
|
235 globals->glyph_count = 0; |
|
236 globals->glyph_scripts = NULL; /* no need to free this one! */ |
|
237 globals->face = NULL; |
|
238 |
|
239 FT_FREE( globals ); |
|
240 } |
|
241 } |
|
242 |
|
243 |
|
244 FT_LOCAL_DEF( FT_Error ) |
|
245 af_face_globals_get_metrics( AF_FaceGlobals globals, |
|
246 FT_UInt gindex, |
|
247 FT_UInt options, |
|
248 AF_ScriptMetrics *ametrics ) |
|
249 { |
|
250 AF_ScriptMetrics metrics = NULL; |
|
251 FT_UInt gidx; |
|
252 AF_ScriptClass clazz; |
|
253 FT_UInt script = options & 15; |
|
254 const FT_Offset script_max = sizeof ( AF_SCRIPT_CLASSES_GET ) / |
|
255 sizeof ( AF_SCRIPT_CLASSES_GET[0] ); |
|
256 FT_Error error = AF_Err_Ok; |
|
257 |
|
258 |
|
259 if ( gindex >= (FT_ULong)globals->glyph_count ) |
|
260 { |
|
261 error = AF_Err_Invalid_Argument; |
|
262 goto Exit; |
|
263 } |
|
264 |
|
265 gidx = script; |
|
266 if ( gidx == 0 || gidx + 1 >= script_max ) |
|
267 gidx = globals->glyph_scripts[gindex] & AF_SCRIPT_LIST_NONE; |
|
268 |
|
269 clazz = AF_SCRIPT_CLASSES_GET[gidx]; |
|
270 if ( script == 0 ) |
|
271 script = clazz->script; |
|
272 |
|
273 metrics = globals->metrics[clazz->script]; |
|
274 if ( metrics == NULL ) |
|
275 { |
|
276 /* create the global metrics object when needed */ |
|
277 FT_Memory memory = globals->face->memory; |
|
278 |
|
279 |
|
280 if ( FT_ALLOC( metrics, clazz->script_metrics_size ) ) |
|
281 goto Exit; |
|
282 |
|
283 metrics->clazz = clazz; |
|
284 |
|
285 if ( clazz->script_metrics_init ) |
|
286 { |
|
287 error = clazz->script_metrics_init( metrics, globals->face ); |
|
288 if ( error ) |
|
289 { |
|
290 if ( clazz->script_metrics_done ) |
|
291 clazz->script_metrics_done( metrics ); |
|
292 |
|
293 FT_FREE( metrics ); |
|
294 goto Exit; |
|
295 } |
|
296 } |
|
297 |
|
298 globals->metrics[clazz->script] = metrics; |
|
299 } |
|
300 |
|
301 Exit: |
|
302 *ametrics = metrics; |
|
303 |
|
304 return error; |
|
305 } |
|
306 |
|
307 |
|
308 FT_LOCAL_DEF( FT_Bool ) |
|
309 af_face_globals_is_digit( AF_FaceGlobals globals, |
|
310 FT_UInt gindex ) |
|
311 { |
|
312 if ( gindex < (FT_ULong)globals->glyph_count ) |
|
313 return (FT_Bool)( globals->glyph_scripts[gindex] & AF_DIGIT ); |
|
314 |
|
315 return (FT_Bool)0; |
|
316 } |
|
317 |
|
318 |
|
319 /* END */ |