zenilib: zenilib/jni/external/freetype2/src/autofit/afglobal.c Source File

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afglobal.c
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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 */
FT_ALLOC
#define FT_ALLOC(ptr, size)
Definition: ftmemory.h:260
FT_Error
int FT_Error
Definition: fttypes.h:296
FT_Long
signed long FT_Long
Definition: fttypes.h:238
FT_ULong
unsigned long FT_ULong
Definition: fttypes.h:249
AF_Script_UniRangeRec_::first
FT_UInt32 first
Definition: aftypes.h:285
afindic.h
FT_FaceRec_::charmap
FT_CharMap charmap
Definition: freetype.h:951
afglobal.h
NULL
#define NULL
Definition: ftobjs.h:61
FT_Get_Next_Char
FT_Get_Next_Char(FT_Face face, FT_ULong char_code, FT_UInt *agindex)
Definition: ftobjs.c:3339
metrics
GLuint GLsizei GLsizei GLfloat * metrics
Definition: glew.h:12394
afdummy.h
AF_DIGIT
#define AF_DIGIT
Definition: afglobal.c:57
FT_Bool
FT_BEGIN_HEADER typedef unsigned char FT_Bool
Definition: fttypes.h:104
aferrors.h
FT_Byte
unsigned char FT_Byte
Definition: fttypes.h:150
af_face_globals_new
af_face_globals_new(FT_Face face, AF_FaceGlobals *aglobals)
Definition: afglobal.c:180
FT_ASSERT
#define FT_ASSERT(condition)
Definition: ftdebug.h:204
AF_ScriptMetricsRec_
Definition: aftypes.h:249
AF_SCRIPT_CLASSES_GET
#define AF_SCRIPT_CLASSES_GET
Definition: afpic.h:29
range
GLenum GLint * range
Definition: glew.h:3391
AF_ScriptClass
struct AF_ScriptClassRec_ const * AF_ScriptClass
Definition: aftypes.h:247
AF_FaceGlobals
typedefFT_BEGIN_HEADER struct AF_FaceGlobalsRec_ * AF_FaceGlobals
Definition: afglobal.h:43
FT_FREE
#define FT_FREE(ptr)
Definition: ftmemory.h:286
AF_Script_UniRangeRec_::last
FT_UInt32 last
Definition: aftypes.h:286
AF_SCRIPT_LIST_NONE
#define AF_SCRIPT_LIST_NONE
Definition: afglobal.c:55
FT_LOCAL_DEF
#define FT_LOCAL_DEF(x)
Definition: ftconfig.h:467
FT_Get_Char_Index
FT_Get_Char_Index(FT_Face face, FT_ULong charcode)
Definition: ftobjs.c:3290
FT_FaceRec_
Definition: freetype.h:912
afpic.h
error
FT_Error error
Definition: cffdrivr.c:407
FT_Select_Charmap
FT_Select_Charmap(FT_Face face, FT_Encoding encoding)
Definition: ftobjs.c:3054
face
GLenum face
Definition: gl2ext.h:1490
aflatin2.h
af_face_globals_free
af_face_globals_free(AF_FaceGlobals globals)
Definition: afglobal.c:211
AF_SCRIPT_MAX
Definition: aftypes.h:242
FT_Set_Charmap
FT_Set_Charmap(FT_Face face, FT_CharMap charmap)
Definition: ftobjs.c:3105
FT_Memory
typedefFT_BEGIN_HEADER struct FT_MemoryRec_ * FT_Memory
Definition: ftsystem.h:66
sizeof
sizeof(FT_AutofitterRec)
FT_CharMapRec_
Definition: freetype.h:736
af_face_globals_is_digit
af_face_globals_is_digit(AF_FaceGlobals globals, FT_UInt gindex)
Definition: afglobal.c:309
AF_FaceGlobalsRec
struct AF_FaceGlobalsRec_ AF_FaceGlobalsRec
FT_UInt
unsigned int FT_UInt
Definition: fttypes.h:227
afcjk.h
AF_ScriptMetricsRec_::clazz
AF_ScriptClass clazz
Definition: aftypes.h:251
AF_SCRIPT_LIST_DEFAULT
#define AF_SCRIPT_LIST_DEFAULT
Definition: afglobal.c:53
AF_Script_UniRangeRec_
Definition: aftypes.h:283
i
int i
Definition: pngrutil.c:1377
FT_MEM_SET
#define FT_MEM_SET(dest, byte, count)
Definition: ftmemory.h:201
af_script_classes
static AF_ScriptClass const af_script_classes[]
Definition: afglobal.c:38
af_face_globals_compute_script_coverage
static FT_Error af_face_globals_compute_script_coverage(AF_FaceGlobals globals)
Definition: afglobal.c:79
af_face_globals_get_metrics
af_face_globals_get_metrics(AF_FaceGlobals globals, FT_UInt gindex, FT_UInt options, AF_ScriptMetrics *ametrics)
Definition: afglobal.c:245
FT_Offset
size_t FT_Offset
Definition: fttypes.h:320
aflatin.h