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fddb839b | 21 | <!ENTITY version SYSTEM "version.sgml"> |
22671e25 | 22 | ]> |
584ac89a KP |
23 | <!-- |
24 | $Id$ | |
25 | ||
46b51147 | 26 | Copyright © 2003 Keith Packard |
584ac89a KP |
27 | |
28 | Permission to use, copy, modify, distribute, and sell this software and its | |
29 | documentation for any purpose is hereby granted without fee, provided that | |
30 | the above copyright notice appear in all copies and that both that | |
31 | copyright notice and this permission notice appear in supporting | |
32 | documentation, and that the name of Keith Packard not be used in | |
33 | advertising or publicity pertaining to distribution of the software without | |
34 | specific, written prior permission. Keith Packard makes no | |
35 | representations about the suitability of this software for any purpose. It | |
36 | is provided "as is" without express or implied warranty. | |
37 | ||
38 | KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
39 | INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
40 | EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
41 | CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
42 | DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
43 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR | |
44 | PERFORMANCE OF THIS SOFTWARE. | |
45 | --> | |
46 | <article> | |
fddb839b | 47 | <title>Fontconfig Developers Reference, Version &version; </title> |
22671e25 KP |
48 | <artheader> |
49 | <author> | |
50 | <firstname>Keith</firstname> | |
51 | <surname>Packard</surname> | |
52 | <affiliation><orgname> | |
53 | HP Cambridge Research Lab | |
54 | </orgname></affiliation> | |
55 | </author> | |
56 | <authorinitials>KRP</authorinitials> | |
57 | <productname>Fontconfig</productname> | |
fddb839b | 58 | <productnumber>&version;</productnumber> |
22671e25 KP |
59 | <LegalNotice> |
60 | <simpara> | |
46b51147 | 61 | Copyright © 2002 Keith Packard |
22671e25 KP |
62 | </simpara><simpara> |
63 | Permission to use, copy, modify, distribute, and sell this software and its | |
64 | documentation for any purpose is hereby granted without fee, provided that | |
65 | the above copyright notice appear in all copies and that both that | |
66 | copyright notice and this permission notice appear in supporting | |
67 | documentation, and that the name of Keith Packard not be used in | |
68 | advertising or publicity pertaining to distribution of the software without | |
69 | specific, written prior permission. Keith Packard makes no | |
70 | representations about the suitability of this software for any purpose. It | |
71 | is provided "as is" without express or implied warranty. | |
72 | </simpara><simpara> | |
73 | KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
74 | INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
75 | EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
76 | CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
77 | DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
78 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR | |
79 | PERFORMANCE OF THIS SOFTWARE. | |
80 | </simpara> | |
81 | </LegalNotice> | |
82 | </artheader> | |
584ac89a KP |
83 | <sect1><title>DESCRIPTION</title> |
84 | <para> | |
85 | Fontconfig is a library designed to provide system-wide font configuration, | |
86 | customization and application access. | |
87 | </para> | |
88 | </sect1> | |
89 | <sect1><title>FUNCTIONAL OVERVIEW</title> | |
90 | <para> | |
91 | Fontconfig contains two essential modules, the configuration module which | |
92 | builds an internal configuration from XML files and the matching module | |
93 | which accepts font patterns and returns the nearest matching font. | |
94 | </para> | |
95 | <sect2><title>FONT CONFIGURATION</title> | |
96 | <para> | |
97 | The configuration module consists of the FcConfig datatype, libexpat and | |
98 | FcConfigParse which walks over an XML tree and ammends a configuration with | |
99 | data found within. From an external perspective, configuration of the | |
100 | library consists of generating a valid XML tree and feeding that to | |
101 | FcConfigParse. The only other mechanism provided to applications for | |
102 | changing the running configuration is to add fonts and directories to the | |
103 | list of application-provided font files. | |
104 | </para><para> | |
105 | The intent is to make font configurations relatively static, and shared by | |
106 | as many applications as possible. It is hoped that this will lead to more | |
107 | stable font selection when passing names from one application to another. | |
108 | XML was chosen as a configuration file format because it provides a format | |
109 | which is easy for external agents to edit while retaining the correct | |
110 | structure and syntax. | |
111 | </para><para> | |
112 | Font configuration is separate from font matching; applications needing to | |
113 | do their own matching can access the available fonts from the library and | |
114 | perform private matching. The intent is to permit applications to pick and | |
115 | choose appropriate functionality from the library instead of forcing them to | |
116 | choose between this library and a private configuration mechanism. The hope | |
117 | is that this will ensure that configuration of fonts for all applications | |
118 | can be centralized in one place. Centralizing font configuration will | |
119 | simplify and regularize font installation and customization. | |
120 | </para> | |
121 | </sect2> | |
122 | <sect2> | |
123 | <title>FONT PROPERTIES</title> | |
124 | <para> | |
125 | While font patterns may contain essentially any properties, there are some | |
126 | well known properties with associated types. Fontconfig uses some of these | |
127 | properties for font matching and font completion. Others are provided as a | |
128 | convenience for the applications rendering mechanism. | |
129 | </para> | |
22671e25 KP |
130 | <programlisting> |
131 | Property Definitions | |
132 | ||
4f27c1c0 | 133 | Property CPP Symbol Type Description |
22671e25 | 134 | ---------------------------------------------------- |
4f27c1c0 KP |
135 | family FC_FAMILY String Font family names |
136 | familylang FC_FAMILYLANG String Language cooresponding to | |
137 | each family name | |
22671e25 KP |
138 | style FC_STYLE String Font style. Overrides weight |
139 | and slant | |
4f27c1c0 KP |
140 | stylelang FC_STYLELANG String Language cooresponding to |
141 | each style name | |
142 | fullname FC_FULLNAME String Font face full name where | |
143 | different from family and | |
0c009d2b | 144 | family + style |
4f27c1c0 KP |
145 | fullnamelang FC_FULLNAMELANG String Language cooresponding to |
146 | each fullname | |
22671e25 KP |
147 | slant FC_SLANT Int Italic, oblique or roman |
148 | weight FC_WEIGHT Int Light, medium, demibold, | |
149 | bold or black | |
150 | size FC_SIZE Double Point size | |
0c009d2b | 151 | width FC_WIDTH Int Condensed, normal or expanded |
22671e25 KP |
152 | aspect FC_ASPECT Double Stretches glyphs horizontally |
153 | before hinting | |
154 | pixelsize FC_PIXEL_SIZE Double Pixel size | |
a05d257f NL |
155 | spacing FC_SPACING Int Proportional, dual-width, |
156 | monospace or charcell | |
22671e25 KP |
157 | foundry FC_FOUNDRY String Font foundry name |
158 | antialias FC_ANTIALIAS Bool Whether glyphs can be | |
159 | antialiased | |
160 | hinting FC_HINTING Bool Whether the rasterizer should | |
161 | use hinting | |
0c009d2b | 162 | hintstyle FC_HINT_STYLE Int Automatic hinting style |
22671e25 KP |
163 | verticallayout FC_VERTICAL_LAYOUT Bool Use vertical layout |
164 | autohint FC_AUTOHINT Bool Use autohinter instead of | |
165 | normal hinter | |
166 | globaladvance FC_GLOBAL_ADVANCE Bool Use font global advance data | |
167 | file FC_FILE String The filename holding the font | |
168 | index FC_INDEX Int The index of the font within | |
169 | the file | |
170 | ftface FC_FT_FACE FT_Face Use the specified FreeType | |
171 | face object | |
172 | rasterizer FC_RASTERIZER String Which rasterizer is in use | |
173 | outline FC_OUTLINE Bool Whether the glyphs are outlines | |
174 | scalable FC_SCALABLE Bool Whether glyphs can be scaled | |
175 | scale FC_SCALE Double Scale factor for point->pixel | |
176 | conversions | |
177 | dpi FC_DPI Double Target dots per inch | |
178 | rgba FC_RGBA Int unknown, rgb, bgr, vrgb, | |
179 | vbgr, none - subpixel geometry | |
53aec111 | 180 | lcdfilter FC_LCD_FILTER Int Type of LCD filter |
22671e25 KP |
181 | minspace FC_MINSPACE Bool Eliminate leading from line |
182 | spacing | |
183 | charset FC_CHARSET CharSet Unicode chars encoded by | |
184 | the font | |
a190678e | 185 | lang FC_LANG LangSet Set of RFC-3066-style |
22671e25 | 186 | languages this font supports |
0c009d2b KP |
187 | fontversion FC_FONTVERSION Int Version number of the font |
188 | capability FC_CAPABILITY String List of layout capabilities in | |
189 | the font | |
190 | embolden FC_EMBOLDEN Bool Rasterizer should | |
191 | synthetically embolden the font | |
22671e25 | 192 | </programlisting> |
584ac89a | 193 | </sect2> |
22dc6fc6 | 194 | </sect1> |
39381776 | 195 | <sect1><title>Datatypes</title> |
584ac89a KP |
196 | <para> |
197 | Fontconfig uses abstract datatypes to hide internal implementation details | |
198 | for most data structures. A few structures are exposed where appropriate. | |
199 | </para> | |
39381776 | 200 | <sect2><title>FcChar8, FcChar16, FcChar32, FcBool</title> |
22671e25 | 201 | <para> |
584ac89a KP |
202 | These are primitive datatypes; the FcChar* types hold precisely the number |
203 | of bits stated (if supported by the C implementation). FcBool holds | |
204 | one of two CPP symbols: FcFalse or FcTrue. | |
22671e25 | 205 | </para> |
39381776 KP |
206 | </sect2> |
207 | <sect2><title>FcMatrix</title> | |
584ac89a KP |
208 | <para> |
209 | An FcMatrix holds an affine transformation, usually used to reshape glyphs. | |
210 | A small set of matrix operations are provided to manipulate these. | |
211 | <programlisting> | |
22671e25 KP |
212 | typedef struct _FcMatrix { |
213 | double xx, xy, yx, yy; | |
214 | } FcMatrix; | |
584ac89a KP |
215 | </programlisting> |
216 | </para> | |
39381776 KP |
217 | </sect2> |
218 | <sect2><title>FcCharSet</title> | |
584ac89a KP |
219 | <para> |
220 | An FcCharSet is an abstract type that holds the set of encoded unicode chars | |
221 | in a font. Operations to build and compare these sets are provided. | |
222 | </para> | |
39381776 | 223 | </sect2> |
a190678e KP |
224 | <sect2><title>FcLangSet</title> |
225 | <para> | |
226 | An FcLangSet is an abstract type that holds the set of languages supported | |
227 | by a font. Operations to build and compare these sets are provided. These | |
228 | are computed for a font based on orthographic information built into the | |
229 | fontconfig library. Fontconfig has orthographies for all of the ISO 639-1 | |
230 | languages except for MS, NA, PA, PS, QU, RN, RW, SD, SG, SN, SU and ZA. If | |
231 | you have orthographic information for any of these languages, please submit | |
232 | them. | |
233 | </para> | |
234 | </sect2> | |
235 | <sect2><title>FcLangResult</title> | |
236 | <para> | |
237 | An FcLangResult is an enumeration used to return the results of comparing | |
238 | two language strings or FcLangSet objects. FcLangEqual means the | |
239 | objects match language and territory. FcLangDifferentTerritory means | |
240 | the objects match in language but differ in territory. | |
241 | FcLangDifferentLang means the objects differ in language. | |
242 | </para> | |
243 | </sect2> | |
39381776 | 244 | <sect2><title>FcType</title> |
584ac89a KP |
245 | <para> |
246 | Tags the kind of data stored in an FcValue. | |
22dc6fc6 | 247 | </para> |
39381776 KP |
248 | </sect2> |
249 | <sect2><title>FcValue</title> | |
584ac89a KP |
250 | <para> |
251 | An FcValue object holds a single value with one of a number of different | |
252 | types. The 'type' tag indicates which member is valid. | |
253 | <programlisting> | |
22671e25 KP |
254 | typedef struct _FcValue { |
255 | FcType type; | |
256 | union { | |
257 | const FcChar8 *s; | |
258 | int i; | |
259 | FcBool b; | |
260 | double d; | |
261 | const FcMatrix *m; | |
262 | const FcCharSet *c; | |
a190678e KP |
263 | void *f; |
264 | const FcLangSet *l; | |
22671e25 KP |
265 | } u; |
266 | } FcValue; | |
267 | </programlisting> | |
268 | <programlisting> | |
269 | FcValue Members | |
270 | ||
271 | Type Union member Datatype | |
272 | -------------------------------- | |
273 | FcTypeVoid (none) (none) | |
274 | FcTypeInteger i int | |
275 | FcTypeDouble d double | |
f2772d6b | 276 | FcTypeString s FcChar8 * |
22671e25 KP |
277 | FcTypeBool b b |
278 | FcTypeMatrix m FcMatrix * | |
279 | FcTypeCharSet c FcCharSet * | |
a190678e KP |
280 | FcTypeFTFace f void * (FT_Face) |
281 | FcTypeLangSet l FcLangSet * | |
584ac89a | 282 | </programlisting> |
22dc6fc6 | 283 | </para> |
39381776 KP |
284 | </sect2> |
285 | <sect2><title>FcPattern</title> | |
584ac89a KP |
286 | <para> |
287 | holds a set of names with associated value lists; each name refers to a | |
288 | property of a font. FcPatterns are used as inputs to the matching code as | |
289 | well as holding information about specific fonts. Each property can hold | |
290 | one or more values; conventionally all of the same type, although the | |
291 | interface doesn't demand that. | |
22dc6fc6 | 292 | </para> |
39381776 KP |
293 | </sect2> |
294 | <sect2><title>FcFontSet</title> | |
584ac89a KP |
295 | <para> |
296 | <programlisting> | |
22671e25 KP |
297 | typedef struct _FcFontSet { |
298 | int nfont; | |
299 | int sfont; | |
300 | FcPattern **fonts; | |
301 | } FcFontSet; | |
584ac89a KP |
302 | </programlisting> |
303 | An FcFontSet contains a list of FcPatterns. Internally fontconfig uses this | |
304 | data structure to hold sets of fonts. Externally, fontconfig returns the | |
305 | results of listing fonts in this format. 'nfont' holds the number of | |
306 | patterns in the 'fonts' array; 'sfont' is used to indicate the size of that | |
307 | array. | |
308 | </para> | |
39381776 KP |
309 | </sect2> |
310 | <sect2><title>FcStrSet, FcStrList</title> | |
584ac89a KP |
311 | <para> |
312 | FcStrSet holds a list of strings that can be appended to and enumerated. | |
313 | Its unique characteristic is that the enumeration works even while strings | |
314 | are appended during enumeration. FcStrList is used during enumeration to | |
315 | safely and correctly walk the list of strings even while that list is edited | |
316 | in the middle of enumeration. | |
317 | </para> | |
39381776 KP |
318 | </sect2> |
319 | <sect2><title>FcObjectSet</title> | |
584ac89a KP |
320 | <para> |
321 | <programlisting> | |
22671e25 KP |
322 | typedef struct _FcObjectSet { |
323 | int nobject; | |
324 | int sobject; | |
325 | const char **objects; | |
326 | } FcObjectSet; | |
584ac89a KP |
327 | </programlisting> |
328 | holds a set of names and is used to specify which fields from fonts are | |
329 | placed in the the list of returned patterns when listing fonts. | |
330 | </para> | |
39381776 KP |
331 | </sect2> |
332 | <sect2><title>FcObjectType</title> | |
584ac89a KP |
333 | <para> |
334 | <programlisting> | |
22671e25 KP |
335 | typedef struct _FcObjectType { |
336 | const char *object; | |
337 | FcType type; | |
338 | } FcObjectType; | |
584ac89a KP |
339 | </programlisting> |
340 | marks the type of a pattern element generated when parsing font names. | |
341 | Applications can add new object types so that font names may contain the new | |
342 | elements. | |
343 | </para> | |
39381776 KP |
344 | </sect2> |
345 | <sect2><title>FcConstant</title> | |
584ac89a KP |
346 | <para> |
347 | <programlisting> | |
22671e25 KP |
348 | typedef struct _FcConstant { |
349 | const FcChar8 *name; | |
350 | const char *object; | |
351 | int value; | |
352 | } FcConstant; | |
584ac89a KP |
353 | </programlisting> |
354 | Provides for symbolic constants for new pattern elements. When 'name' is | |
355 | seen in a font name, an 'object' element is created with value 'value'. | |
356 | </para> | |
39381776 KP |
357 | </sect2> |
358 | <sect2><title>FcBlanks</title> | |
584ac89a KP |
359 | <para> |
360 | holds a list of Unicode chars which are expected to be blank; unexpectedly | |
361 | blank chars are assumed to be invalid and are elided from the charset | |
362 | associated with the font. | |
363 | </para> | |
39381776 KP |
364 | </sect2> |
365 | <sect2><title>FcFileCache</title> | |
584ac89a KP |
366 | <para> |
367 | holds the per-user cache information for use while loading the font | |
368 | database. This is built automatically for the current configuration when | |
369 | that is loaded. Applications must always pass '0' when one is requested. | |
370 | </para> | |
39381776 KP |
371 | </sect2> |
372 | <sect2><title>FcConfig</title> | |
584ac89a KP |
373 | <para> |
374 | holds a complete configuration of the library; there is one default | |
375 | configuration, other can be constructed from XML data structures. All | |
376 | public entry points that need global data can take an optional FcConfig* | |
377 | argument; passing 0 uses the default configuration. FcConfig objects hold two | |
378 | sets of fonts, the first contains those specified by the configuration, the | |
379 | second set holds those added by the application at run-time. Interfaces | |
380 | that need to reference a particulat set use one of the FcSetName enumerated | |
381 | values. | |
382 | </para> | |
39381776 KP |
383 | </sect2> |
384 | <sect2><title>FcSetName</title> | |
584ac89a KP |
385 | <para> |
386 | Specifies one of the two sets of fonts available in a configuration; | |
387 | FcSetSystem for those fonts specified in the configuration and | |
388 | FcSetApplication which holds fonts provided by the application. | |
389 | </para> | |
39381776 KP |
390 | </sect2> |
391 | <sect2><title>FcResult</title> | |
584ac89a KP |
392 | <para> |
393 | Used as a return type for functions manipulating FcPattern objects. | |
22671e25 KP |
394 | <programlisting> |
395 | FcResult Values | |
396 | Result Code Meaning | |
397 | ----------------------------------------------------------- | |
398 | FcResultMatch Object exists with the specified ID | |
399 | FcResultNoMatch Object doesn't exist at all | |
400 | FcResultTypeMismatch Object exists, but the type doesn't match | |
401 | FcResultNoId Object exists, but has fewer values | |
402 | than specified | |
0c009d2b | 403 | FcResultOutOfMemory Malloc failed |
22671e25 | 404 | </programlisting> |
584ac89a | 405 | </para> |
39381776 KP |
406 | </sect2> |
407 | <sect2><title>FcAtomic</title> | |
584ac89a KP |
408 | <para> |
409 | Used for locking access to config files. Provides a safe way to update | |
410 | configuration files. | |
411 | </para> | |
39381776 | 412 | </sect2> |
dc7b6f1d KP |
413 | <sect2><title>FcCache</title> |
414 | <para> | |
415 | Holds information about the fonts contained in a single directory. Normal | |
416 | applications need not worry about this as caches for font access are | |
417 | automatically managed by the library. Applications dealing with cache | |
418 | management may want to use some of these objects in their work, however the | |
419 | included 'fc-cache' program generally suffices for all of that. | |
420 | </para> | |
421 | </sect2> | |
584ac89a KP |
422 | </sect1> |
423 | <sect1><title>FUNCTIONS</title> | |
424 | <para> | |
39381776 KP |
425 | These are grouped by functionality, often using the main datatype being |
426 | manipulated. | |
584ac89a | 427 | </para> |
39381776 | 428 | <sect2><title>Initialization</title> |
584ac89a | 429 | <para> |
39381776 | 430 | These functions provide some control over how the library is initialized. |
584ac89a | 431 | </para> |
39381776 | 432 | &fcinit; |
584ac89a KP |
433 | </sect2> |
434 | <sect2><title>FcPattern</title> | |
435 | <para> | |
436 | An FcPattern is an opaque type that holds both patterns to match against the | |
437 | available fonts, as well as the information about each font. | |
438 | </para> | |
22671e25 | 439 | &fcpattern; |
584ac89a KP |
440 | </sect2> |
441 | <sect2><title>FcFontSet</title> | |
442 | <para> | |
443 | An FcFontSet simply holds a list of patterns; these are used to return the | |
444 | results of listing available fonts. | |
445 | </para> | |
bfc2dc3a KP |
446 | &fcfontset; |
447 | </sect2> | |
584ac89a KP |
448 | <sect2><title>FcObjectSet</title> |
449 | <para> | |
450 | An FcObjectSet holds a list of pattern property names; it is used to | |
451 | indiciate which properties are to be returned in the patterns from | |
452 | FcFontList. | |
453 | </para> | |
bfc2dc3a KP |
454 | &fcobjectset; |
455 | </sect2> | |
39381776 KP |
456 | <sect2><title>FreeType specific functions</title> |
457 | <para> | |
458 | While the fontconfig library doesn't insist that FreeType be used as the | |
459 | rasterization mechanism for fonts, it does provide some convenience | |
460 | functions. | |
461 | </para> | |
462 | &fcfreetype; | |
463 | </sect2> | |
464 | <sect2><title>FcValue</title> | |
465 | <para> | |
466 | FcValue is a structure containing a type tag and a union of all possible | |
467 | datatypes. The tag is an enum of type | |
468 | <emphasis>FcType</emphasis> | |
469 | and is intended to provide a measure of run-time | |
470 | typechecking, although that depends on careful programming. | |
471 | </para> | |
472 | &fcvalue; | |
473 | </sect2> | |
474 | <sect2><title>FcCharSet</title> | |
475 | <para> | |
476 | An FcCharSet is a boolean array indicating a set of unicode chars. Those | |
477 | associated with a font are marked constant and cannot be edited. | |
478 | FcCharSets may be reference counted internally to reduce memory consumption; | |
479 | this may be visible to applications as the result of FcCharSetCopy may | |
480 | return it's argument, and that CharSet may remain unmodifiable. | |
481 | </para> | |
482 | &fccharset; | |
483 | </sect2> | |
dc7b6f1d KP |
484 | <sect2><title>FcLangSet</title> |
485 | <para> | |
486 | An FcLangSet is a set of language names (each of which include language and | |
487 | an optional territory). They are used when selecting fonts to indicate which | |
488 | languages the fonts need to support. Each font is marked, using language | |
489 | orthography information built into fontconfig, with the set of supported | |
490 | languages. | |
491 | </para> | |
492 | &fclangset; | |
493 | </sect2> | |
39381776 KP |
494 | <sect2><title>FcMatrix</title> |
495 | <para> | |
496 | FcMatrix structures hold an affine transformation in matrix form. | |
497 | </para> | |
498 | &fcmatrix; | |
499 | </sect2> | |
500 | <sect2><title>FcConfig</title> | |
501 | <para> | |
502 | An FcConfig object holds the internal representation of a configuration. | |
503 | There is a default configuration which applications may use by passing 0 to | |
504 | any function using the data within an FcConfig. | |
505 | </para> | |
506 | &fcconfig; | |
507 | </sect2> | |
584ac89a KP |
508 | <sect2><title>FcObjectType</title> |
509 | <para> | |
510 | Provides for applcation-specified font name object types so that new | |
511 | pattern elements can be generated from font names. | |
512 | </para> | |
bfc2dc3a KP |
513 | &fcobjecttype; |
514 | </sect2> | |
584ac89a KP |
515 | <sect2><title>FcConstant</title> |
516 | <para> | |
517 | Provides for application-specified symbolic constants for font names. | |
518 | </para> | |
bfc2dc3a KP |
519 | &fcconstant; |
520 | </sect2> | |
584ac89a KP |
521 | <sect2><title>FcBlanks</title> |
522 | <para> | |
523 | An FcBlanks object holds a list of Unicode chars which are expected to | |
524 | be blank when drawn. When scanning new fonts, any glyphs which are | |
525 | empty and not in this list will be assumed to be broken and not placed in | |
526 | the FcCharSet associated with the font. This provides a significantly more | |
527 | accurate CharSet for applications. | |
528 | </para> | |
bfc2dc3a KP |
529 | &fcblanks; |
530 | </sect2> | |
584ac89a KP |
531 | <sect2><title>FcAtomic</title> |
532 | <para> | |
533 | These functions provide a safe way to update config files, allowing ongoing | |
534 | reading of the old config file while locked for writing and ensuring that a | |
535 | consistent and complete version of the config file is always available. | |
536 | </para> | |
39381776 KP |
537 | &fcatomic; |
538 | </sect2> | |
584ac89a | 539 | <sect2><title>File and Directory routines</title> |
39381776 KP |
540 | <para> |
541 | These routines work with font files and directories, including font | |
542 | directory cache files. | |
8c87b429 | 543 | </para> |
39381776 | 544 | &fcfile; |
dc7b6f1d KP |
545 | &fcdircache; |
546 | </sect2> | |
547 | <sect2><title>FcCache routines</title> | |
548 | <para> | |
549 | These routines work with font directory caches, accessing their contents in | |
550 | limited ways. It is not expected that normal applications will need to use | |
551 | these functions. | |
552 | </para> | |
553 | &fccache; | |
39381776 | 554 | </sect2> |
584ac89a KP |
555 | <sect2><title>FcStrSet and FcStrList</title> |
556 | <para> | |
557 | A data structure for enumerating strings, used to list directories while | |
558 | scanning the configuration as directories are added while scanning. | |
559 | </para> | |
39381776 KP |
560 | &fcstrset; |
561 | </sect2> | |
584ac89a | 562 | <sect2><title>String utilities</title> |
39381776 KP |
563 | <para> |
564 | Fontconfig manipulates many UTF-8 strings represented with the FcChar8 type. | |
565 | These functions are exposed to help applications deal with these UTF-8 | |
566 | strings in a locale-insensitive manner. | |
567 | </para> | |
568 | &fcstring; | |
569 | </sect2> | |
584ac89a KP |
570 | </sect1> |
571 | </article> |