fontconfig-user.txt revision ca08ab68
1 fonts-conf 2 3Name 4 5 fonts.conf -- Font configuration files 6 7Synopsis 8 9 /etc/fonts/fonts.conf 10 /etc/fonts/fonts.dtd 11 /etc/fonts/conf.d 12 $XDG_CONFIG_HOME/fontconfig/conf.d 13 $XDG_CONFIG_HOME/fontconfig/fonts.conf 14 ~/.fonts.conf.d 15 ~/.fonts.conf 16 17Description 18 19 Fontconfig is a library designed to provide system-wide font 20 configuration, customization and application access. 21 22Functional Overview 23 24 Fontconfig contains two essential modules, the configuration module which 25 builds an internal configuration from XML files and the matching module 26 which accepts font patterns and returns the nearest matching font. 27 28 Font Configuration 29 30 The configuration module consists of the FcConfig datatype, libexpat and 31 FcConfigParse which walks over an XML tree and amends a configuration with 32 data found within. From an external perspective, configuration of the 33 library consists of generating a valid XML tree and feeding that to 34 FcConfigParse. The only other mechanism provided to applications for 35 changing the running configuration is to add fonts and directories to the 36 list of application-provided font files. 37 38 The intent is to make font configurations relatively static, and shared by 39 as many applications as possible. It is hoped that this will lead to more 40 stable font selection when passing names from one application to another. 41 XML was chosen as a configuration file format because it provides a format 42 which is easy for external agents to edit while retaining the correct 43 structure and syntax. 44 45 Font configuration is separate from font matching; applications needing to 46 do their own matching can access the available fonts from the library and 47 perform private matching. The intent is to permit applications to pick and 48 choose appropriate functionality from the library instead of forcing them 49 to choose between this library and a private configuration mechanism. The 50 hope is that this will ensure that configuration of fonts for all 51 applications can be centralized in one place. Centralizing font 52 configuration will simplify and regularize font installation and 53 customization. 54 55 Font Properties 56 57 While font patterns may contain essentially any properties, there are some 58 well known properties with associated types. Fontconfig uses some of these 59 properties for font matching and font completion. Others are provided as a 60 convenience for the applications' rendering mechanism. 61 62 Property Type Description 63 -------------------------------------------------------------- 64 family String Font family names 65 familylang String Languages corresponding to each family 66 style String Font style. Overrides weight and slant 67 stylelang String Languages corresponding to each style 68 fullname String Font full names (often includes style) 69 fullnamelang String Languages corresponding to each fullname 70 slant Int Italic, oblique or roman 71 weight Int Light, medium, demibold, bold or black 72 size Double Point size 73 width Int Condensed, normal or expanded 74 aspect Double Stretches glyphs horizontally before hinting 75 pixelsize Double Pixel size 76 spacing Int Proportional, dual-width, monospace or charcell 77 foundry String Font foundry name 78 antialias Bool Whether glyphs can be antialiased 79 hinting Bool Whether the rasterizer should use hinting 80 hintstyle Int Automatic hinting style 81 verticallayout Bool Use vertical layout 82 autohint Bool Use autohinter instead of normal hinter 83 globaladvance Bool Use font global advance data (deprecated) 84 file String The filename holding the font 85 index Int The index of the font within the file 86 ftface FT_Face Use the specified FreeType face object 87 rasterizer String Which rasterizer is in use 88 outline Bool Whether the glyphs are outlines 89 scalable Bool Whether glyphs can be scaled 90 scale Double Scale factor for point->pixel conversions 91 dpi Double Target dots per inch 92 rgba Int unknown, rgb, bgr, vrgb, vbgr, 93 none - subpixel geometry 94 lcdfilter Int Type of LCD filter 95 minspace Bool Eliminate leading from line spacing 96 charset CharSet Unicode chars encoded by the font 97 lang String List of RFC-3066-style languages this 98 font supports 99 fontversion Int Version number of the font 100 capability String List of layout capabilities in the font 101 embolden Bool Rasterizer should synthetically embolden the font 102 103 104 Font Matching 105 106 Fontconfig performs matching by measuring the distance from a provided 107 pattern to all of the available fonts in the system. The closest matching 108 font is selected. This ensures that a font will always be returned, but 109 doesn't ensure that it is anything like the requested pattern. 110 111 Font matching starts with an application constructed pattern. The desired 112 attributes of the resulting font are collected together in a pattern. Each 113 property of the pattern can contain one or more values; these are listed 114 in priority order; matches earlier in the list are considered "closer" 115 than matches later in the list. 116 117 The initial pattern is modified by applying the list of editing 118 instructions specific to patterns found in the configuration; each 119 consists of a match predicate and a set of editing operations. They are 120 executed in the order they appeared in the configuration. Each match 121 causes the associated sequence of editing operations to be applied. 122 123 After the pattern has been edited, a sequence of default substitutions are 124 performed to canonicalize the set of available properties; this avoids the 125 need for the lower layers to constantly provide default values for various 126 font properties during rendering. 127 128 The canonical font pattern is finally matched against all available fonts. 129 The distance from the pattern to the font is measured for each of several 130 properties: foundry, charset, family, lang, spacing, pixelsize, style, 131 slant, weight, antialias, rasterizer and outline. This list is in priority 132 order -- results of comparing earlier elements of this list weigh more 133 heavily than later elements. 134 135 There is one special case to this rule; family names are split into two 136 bindings; strong and weak. Strong family names are given greater 137 precedence in the match than lang elements while weak family names are 138 given lower precedence than lang elements. This permits the document 139 language to drive font selection when any document specified font is 140 unavailable. 141 142 The pattern representing that font is augmented to include any properties 143 found in the pattern but not found in the font itself; this permits the 144 application to pass rendering instructions or any other data through the 145 matching system. Finally, the list of editing instructions specific to 146 fonts found in the configuration are applied to the pattern. This modified 147 pattern is returned to the application. 148 149 The return value contains sufficient information to locate and rasterize 150 the font, including the file name, pixel size and other rendering data. As 151 none of the information involved pertains to the FreeType library, 152 applications are free to use any rasterization engine or even to take the 153 identified font file and access it directly. 154 155 The match/edit sequences in the configuration are performed in two passes 156 because there are essentially two different operations necessary -- the 157 first is to modify how fonts are selected; aliasing families and adding 158 suitable defaults. The second is to modify how the selected fonts are 159 rasterized. Those must apply to the selected font, not the original 160 pattern as false matches will often occur. 161 162 Font Names 163 164 Fontconfig provides a textual representation for patterns that the library 165 can both accept and generate. The representation is in three parts, first 166 a list of family names, second a list of point sizes and finally a list of 167 additional properties: 168 169 <families>-<point sizes>:<name1>=<values1>:<name2>=<values2>... 170 171 172 Values in a list are separated with commas. The name needn't include 173 either families or point sizes; they can be elided. In addition, there are 174 symbolic constants that simultaneously indicate both a name and a value. 175 Here are some examples: 176 177 Name Meaning 178 ---------------------------------------------------------- 179 Times-12 12 point Times Roman 180 Times-12:bold 12 point Times Bold 181 Courier:italic Courier Italic in the default size 182 Monospace:matrix=1 .1 0 1 The users preferred monospace font 183 with artificial obliquing 184 185 186 The '\', '-', ':' and ',' characters in family names must be preceded by a 187 '\' character to avoid having them misinterpreted. Similarly, values 188 containing '\', '=', '_', ':' and ',' must also have them preceded by a 189 '\' character. The '\' characters are stripped out of the family name and 190 values as the font name is read. 191 192Debugging Applications 193 194 To help diagnose font and applications problems, fontconfig is built with 195 a large amount of internal debugging left enabled. It is controlled by 196 means of the FC_DEBUG environment variable. The value of this variable is 197 interpreted as a number, and each bit within that value controls different 198 debugging messages. 199 200 Name Value Meaning 201 --------------------------------------------------------- 202 MATCH 1 Brief information about font matching 203 MATCHV 2 Extensive font matching information 204 EDIT 4 Monitor match/test/edit execution 205 FONTSET 8 Track loading of font information at startup 206 CACHE 16 Watch cache files being written 207 CACHEV 32 Extensive cache file writing information 208 PARSE 64 (no longer in use) 209 SCAN 128 Watch font files being scanned to build caches 210 SCANV 256 Verbose font file scanning information 211 MEMORY 512 Monitor fontconfig memory usage 212 CONFIG 1024 Monitor which config files are loaded 213 LANGSET 2048 Dump char sets used to construct lang values 214 OBJTYPES 4096 Display message when value typechecks fail 215 216 217 Add the value of the desired debug levels together and assign that (in 218 base 10) to the FC_DEBUG environment variable before running the 219 application. Output from these statements is sent to stdout. 220 221Lang Tags 222 223 Each font in the database contains a list of languages it supports. This 224 is computed by comparing the Unicode coverage of the font with the 225 orthography of each language. Languages are tagged using an RFC-3066 226 compatible naming and occur in two parts -- the ISO 639 language tag 227 followed a hyphen and then by the ISO 3166 country code. The hyphen and 228 country code may be elided. 229 230 Fontconfig has orthographies for several languages built into the library. 231 No provision has been made for adding new ones aside from rebuilding the 232 library. It currently supports 122 of the 139 languages named in ISO 233 639-1, 141 of the languages with two-letter codes from ISO 639-2 and 234 another 30 languages with only three-letter codes. Languages with both two 235 and three letter codes are provided with only the two letter code. 236 237 For languages used in multiple territories with radically different 238 character sets, fontconfig includes per-territory orthographies. This 239 includes Azerbaijani, Kurdish, Pashto, Tigrinya and Chinese. 240 241Configuration File Format 242 243 Configuration files for fontconfig are stored in XML format; this format 244 makes external configuration tools easier to write and ensures that they 245 will generate syntactically correct configuration files. As XML files are 246 plain text, they can also be manipulated by the expert user using a text 247 editor. 248 249 The fontconfig document type definition resides in the external entity 250 "fonts.dtd"; this is normally stored in the default font configuration 251 directory (/etc/fonts). Each configuration file should contain the 252 following structure: 253 254 <?xml version="1.0"?> 255 <!DOCTYPE fontconfig SYSTEM "fonts.dtd"> 256 <fontconfig> 257 ... 258 </fontconfig> 259 260 261 <fontconfig> 262 263 This is the top level element for a font configuration and can contain 264 <dir>, <cachedir>, <include>, <match> and <alias> elements in any order. 265 266 <dir prefix="default"> 267 268 This element contains a directory name which will be scanned for font 269 files to include in the set of available fonts. If 'prefix' is set to 270 "xdg", the value in the XDG_DATA_HOME environment variable will be added 271 as the path prefix. please see XDG Base Directory Specification for more 272 details. 273 274 <cachedir prefix="default"> 275 276 This element contains a directory name that is supposed to be stored or 277 read the cache of font information. If multiple elements are specified in 278 the configuration file, the directory that can be accessed first in the 279 list will be used to store the cache files. If it starts with '~', it 280 refers to a directory in the users home directory. If 'prefix' is set to 281 "xdg", the value in the XDG_CACHE_HOME environment variable will be added 282 as the path prefix. please see XDG Base Directory Specification for more 283 details. The default directory is ``$XDG_CACHE_HOME/fontconfig'' and it 284 contains the cache files named ``<hash 285 value>-<architecture>.cache-<version'', where <version> is the font 286 configureation file version number (currently 3). 287 288 <include ignore_missing="no" prefix="default"> 289 290 This element contains the name of an additional configuration file or 291 directory. If a directory, every file within that directory starting with 292 an ASCII digit (U+0030 - U+0039) and ending with the string ``.conf'' will 293 be processed in sorted order. When the XML datatype is traversed by 294 FcConfigParse, the contents of the file(s) will also be incorporated into 295 the configuration by passing the filename(s) to FcConfigLoadAndParse. If 296 'ignore_missing' is set to "yes" instead of the default "no", a missing 297 file or directory will elicit no warning message from the library. If 298 'prefix' is set to "xdg", the value in the XDG_CONFIG_HOME environment 299 variable will be added as the path prefix. please see XDG Base Directory 300 Specification for more details. 301 302 <config> 303 304 This element provides a place to consolidate additional configuration 305 information. <config> can contain <blank> and <rescan> elements in any 306 order. 307 308 <blank> 309 310 Fonts often include "broken" glyphs which appear in the encoding but are 311 drawn as blanks on the screen. Within the <blank> element, place each 312 Unicode characters which is supposed to be blank in an <int> element. 313 Characters outside of this set which are drawn as blank will be elided 314 from the set of characters supported by the font. 315 316 <rescan> 317 318 The <rescan> element holds an <int> element which indicates the default 319 interval between automatic checks for font configuration changes. 320 Fontconfig will validate all of the configuration files and directories 321 and automatically rebuild the internal datastructures when this interval 322 passes. 323 324 <selectfont> 325 326 This element is used to black/white list fonts from being listed or 327 matched against. It holds acceptfont and rejectfont elements. 328 329 <acceptfont> 330 331 Fonts matched by an acceptfont element are "whitelisted"; such fonts are 332 explicitly included in the set of fonts used to resolve list and match 333 requests; including them in this list protects them from being 334 "blacklisted" by a rejectfont element. Acceptfont elements include glob 335 and pattern elements which are used to match fonts. 336 337 <rejectfont> 338 339 Fonts matched by an rejectfont element are "blacklisted"; such fonts are 340 excluded from the set of fonts used to resolve list and match requests as 341 if they didn't exist in the system. Rejectfont elements include glob and 342 pattern elements which are used to match fonts. 343 344 <glob> 345 346 Glob elements hold shell-style filename matching patterns (including ? and 347 *) which match fonts based on their complete pathnames. This can be used 348 to exclude a set of directories (/usr/share/fonts/uglyfont*), or 349 particular font file types (*.pcf.gz), but the latter mechanism relies 350 rather heavily on filenaming conventions which can't be relied upon. Note 351 that globs only apply to directories, not to individual fonts. 352 353 <pattern> 354 355 Pattern elements perform list-style matching on incoming fonts; that is, 356 they hold a list of elements and associated values. If all of those 357 elements have a matching value, then the pattern matches the font. This 358 can be used to select fonts based on attributes of the font (scalable, 359 bold, etc), which is a more reliable mechanism than using file extensions. 360 Pattern elements include patelt elements. 361 362 <patelt name="property"> 363 364 Patelt elements hold a single pattern element and list of values. They 365 must have a 'name' attribute which indicates the pattern element name. 366 Patelt elements include int, double, string, matrix, bool, charset and 367 const elements. 368 369 <match target="pattern"> 370 371 This element holds first a (possibly empty) list of <test> elements and 372 then a (possibly empty) list of <edit> elements. Patterns which match all 373 of the tests are subjected to all the edits. If 'target' is set to "font" 374 instead of the default "pattern", then this element applies to the font 375 name resulting from a match rather than a font pattern to be matched. If 376 'target' is set to "scan", then this element applies when the font is 377 scanned to build the fontconfig database. 378 379 <test qual="any" name="property" target="default" compare="eq"> 380 381 This element contains a single value which is compared with the target 382 ('pattern', 'font', 'scan' or 'default') property "property" (substitute 383 any of the property names seen above). 'compare' can be one of "eq", 384 "not_eq", "less", "less_eq", "more", "more_eq", "contains" or 385 "not_contains". 'qual' may either be the default, "any", in which case the 386 match succeeds if any value associated with the property matches the test 387 value, or "all", in which case all of the values associated with the 388 property must match the test value. 'ignore-blanks' takes a boolean value. 389 if 'ignore-blanks' is set "true", any blanks in the string will be ignored 390 on its comparison. this takes effects only when compare="eq" or 391 compare="not_eq". When used in a <match target="font"> element, the 392 target= attribute in the <test> element selects between matching the 393 original pattern or the font. "default" selects whichever target the outer 394 <match> element has selected. 395 396 <edit name="property" mode="assign" binding="weak"> 397 398 This element contains a list of expression elements (any of the value or 399 operator elements). The expression elements are evaluated at run-time and 400 modify the property "property". The modification depends on whether 401 "property" was matched by one of the associated <test> elements, if so, 402 the modification may affect the first matched value. Any values inserted 403 into the property are given the indicated binding ("strong", "weak" or 404 "same") with "same" binding using the value from the matched pattern 405 element. 'mode' is one of: 406 407 Mode With Match Without Match 408 --------------------------------------------------------------------- 409 "assign" Replace matching value Replace all values 410 "assign_replace" Replace all values Replace all values 411 "prepend" Insert before matching Insert at head of list 412 "prepend_first" Insert at head of list Insert at head of list 413 "append" Append after matching Append at end of list 414 "append_last" Append at end of list Append at end of list 415 416 417 <int>, <double>, <string>, <bool> 418 419 These elements hold a single value of the indicated type. <bool> elements 420 hold either true or false. An important limitation exists in the parsing 421 of floating point numbers -- fontconfig requires that the mantissa start 422 with a digit, not a decimal point, so insert a leading zero for purely 423 fractional values (e.g. use 0.5 instead of .5 and -0.5 instead of -.5). 424 425 <matrix> 426 427 This element holds the four <double> elements of an affine transformation. 428 429 <range> 430 431 This element holds the two <int> elements of a range representation. 432 433 <charset> 434 435 This element holds at least one <int> element of an Unicode code point or 436 more. 437 438 <langset> 439 440 This element holds at least one <string> element of a RFC-3066-style 441 languages or more. 442 443 <name> 444 445 Holds a property name. Evaluates to the first value from the property of 446 the font, not the pattern. 447 448 <const> 449 450 Holds the name of a constant; these are always integers and serve as 451 symbolic names for common font values: 452 453 Constant Property Value 454 ------------------------------------- 455 thin weight 0 456 extralight weight 40 457 ultralight weight 40 458 light weight 50 459 book weight 75 460 regular weight 80 461 normal weight 80 462 medium weight 100 463 demibold weight 180 464 semibold weight 180 465 bold weight 200 466 extrabold weight 205 467 black weight 210 468 heavy weight 210 469 roman slant 0 470 italic slant 100 471 oblique slant 110 472 ultracondensed width 50 473 extracondensed width 63 474 condensed width 75 475 semicondensed width 87 476 normal width 100 477 semiexpanded width 113 478 expanded width 125 479 extraexpanded width 150 480 ultraexpanded width 200 481 proportional spacing 0 482 dual spacing 90 483 mono spacing 100 484 charcell spacing 110 485 unknown rgba 0 486 rgb rgba 1 487 bgr rgba 2 488 vrgb rgba 3 489 vbgr rgba 4 490 none rgba 5 491 lcdnone lcdfilter 0 492 lcddefault lcdfilter 1 493 lcdlight lcdfilter 2 494 lcdlegacy lcdfilter 3 495 hintnone hintstyle 0 496 hintslight hintstyle 1 497 hintmedium hintstyle 2 498 hintfull hintstyle 3 499 500 501 <or>, <and>, <plus>, <minus>, <times>, <divide> 502 503 These elements perform the specified operation on a list of expression 504 elements. <or> and <and> are boolean, not bitwise. 505 506 <eq>, <not_eq>, <less>, <less_eq>, <more>, <more_eq>, <contains>, 507 <not_contains 508 509 These elements compare two values, producing a boolean result. 510 511 <not> 512 513 Inverts the boolean sense of its one expression element 514 515 <if> 516 517 This element takes three expression elements; if the value of the first is 518 true, it produces the value of the second, otherwise it produces the value 519 of the third. 520 521 <alias> 522 523 Alias elements provide a shorthand notation for the set of common match 524 operations needed to substitute one font family for another. They contain 525 a <family> element followed by optional <prefer>, <accept> and <default> 526 elements. Fonts matching the <family> element are edited to prepend the 527 list of <prefer>ed families before the matching <family>, append the 528 <accept>able families after the matching <family> and append the <default> 529 families to the end of the family list. 530 531 <family> 532 533 Holds a single font family name 534 535 <prefer>, <accept>, <default> 536 537 These hold a list of <family> elements to be used by the <alias> element. 538 539EXAMPLE CONFIGURATION FILE 540 541 System configuration file 542 543 This is an example of a system-wide configuration file 544 545<?xml version="1.0"?> 546<!DOCTYPE fontconfig SYSTEM "fonts.dtd"> 547<!-- /etc/fonts/fonts.conf file to configure system font access --> 548<fontconfig> 549<!-- 550 Find fonts in these directories 551--> 552<dir>/usr/share/fonts</dir> 553<dir>/usr/X11R6/lib/X11/fonts</dir> 554 555<!-- 556 Accept deprecated 'mono' alias, replacing it with 'monospace' 557--> 558<match target="pattern"> 559 <test qual="any" name="family"><string>mono</string></test> 560 <edit name="family" mode="assign"><string>monospace</string></edit> 561</match> 562 563<!-- 564 Names not including any well known alias are given 'sans-serif' 565--> 566<match target="pattern"> 567 <test qual="all" name="family" mode="not_eq"><string>sans-serif</string></test> 568 <test qual="all" name="family" mode="not_eq"><string>serif</string></test> 569 <test qual="all" name="family" mode="not_eq"><string>monospace</string></test> 570 <edit name="family" mode="append_last"><string>sans-serif</string></edit> 571</match> 572 573<!-- 574 Load per-user customization file, but don't complain 575 if it doesn't exist 576--> 577<include ignore_missing="yes" prefix="xdg">fontconfig/fonts.conf</include> 578 579<!-- 580 Load local customization files, but don't complain 581 if there aren't any 582--> 583<include ignore_missing="yes">conf.d</include> 584<include ignore_missing="yes">local.conf</include> 585 586<!-- 587 Alias well known font names to available TrueType fonts. 588 These substitute TrueType faces for similar Type1 589 faces to improve screen appearance. 590--> 591<alias> 592 <family>Times</family> 593 <prefer><family>Times New Roman</family></prefer> 594 <default><family>serif</family></default> 595</alias> 596<alias> 597 <family>Helvetica</family> 598 <prefer><family>Arial</family></prefer> 599 <default><family>sans</family></default> 600</alias> 601<alias> 602 <family>Courier</family> 603 <prefer><family>Courier New</family></prefer> 604 <default><family>monospace</family></default> 605</alias> 606 607<!-- 608 Provide required aliases for standard names 609 Do these after the users configuration file so that 610 any aliases there are used preferentially 611--> 612<alias> 613 <family>serif</family> 614 <prefer><family>Times New Roman</family></prefer> 615</alias> 616<alias> 617 <family>sans</family> 618 <prefer><family>Arial</family></prefer> 619</alias> 620<alias> 621 <family>monospace</family> 622 <prefer><family>Andale Mono</family></prefer> 623</alias> 624 625<-- 626 The example of the requirements of OR operator; 627 If the 'family' contains 'Courier New' OR 'Courier' 628 add 'monospace' as the alternative 629--> 630<match target="pattern"> 631 <test name="family" mode="eq"> 632 <string>Courier New</string> 633 </test> 634 <edit name="family" mode="prepend"> 635 <string>monospace</string> 636 </edit> 637</match> 638<match target="pattern"> 639 <test name="family" mode="eq"> 640 <string>Courier</string> 641 </test> 642 <edit name="family" mode="prepend"> 643 <string>monospace</string> 644 </edit> 645</match> 646 647</fontconfig> 648 649 650 User configuration file 651 652 This is an example of a per-user configuration file that lives in 653 $XDG_CONFIG_HOME/fontconfig/fonts.conf 654 655 <?xml version="1.0"?> 656 <!DOCTYPE fontconfig SYSTEM "fonts.dtd"> 657 <!-- $XDG_CONFIG_HOME/fontconfig/fonts.conf for per-user font configuration --> 658 <fontconfig> 659 660 <!-- 661 Private font directory 662 --> 663 <dir prefix="xdg">fonts</dir> 664 665 <!-- 666 use rgb sub-pixel ordering to improve glyph appearance on 667 LCD screens. Changes affecting rendering, but not matching 668 should always use target="font". 669 --> 670 <match target="font"> 671 <edit name="rgba" mode="assign"><const>rgb</const></edit> 672 </match> 673 <!-- 674 use WenQuanYi Zen Hei font when serif is requested for Chinese 675 --> 676 <match> 677 <!-- 678 If you don't want to use WenQuanYi Zen Hei font for zh-tw etc, 679 you can use zh-cn instead of zh. 680 Please note, even if you set zh-cn, it still matches zh. 681 if you don't like it, you can use compare="eq" 682 instead of compare="contains". 683 --> 684 <test name="lang" compare="contains"> 685 <string>zh</string> 686 </test> 687 <test name="family"> 688 <string>serif</string> 689 </test> 690 <edit name="family" mode="prepend"> 691 <string>WenQuanYi Zen Hei</string> 692 </edit> 693 </match> 694 <!-- 695 use VL Gothic font when sans-serif is requested for Japanese 696 --> 697 <match> 698 <test name="lang" compare="contains"> 699 <string>ja</string> 700 </test> 701 <test name="family"> 702 <string>sans-serif</string> 703 </test> 704 <edit name="family" mode="prepend"> 705 <string>VL Gothic</string> 706 </edit> 707 </match> 708 </fontconfig> 709 710 711Files 712 713 fonts.conf contains configuration information for the fontconfig library 714 consisting of directories to look at for font information as well as 715 instructions on editing program specified font patterns before attempting 716 to match the available fonts. It is in XML format. 717 718 conf.d is the conventional name for a directory of additional 719 configuration files managed by external applications or the local 720 administrator. The filenames starting with decimal digits are sorted in 721 lexicographic order and used as additional configuration files. All of 722 these files are in XML format. The master fonts.conf file references this 723 directory in an <include> directive. 724 725 fonts.dtd is a DTD that describes the format of the configuration files. 726 727 $XDG_CONFIG_HOME/fontconfig/conf.d and ~/.fonts.conf.d is the conventional 728 name for a per-user directory of (typically auto-generated) configuration 729 files, although the actual location is specified in the global fonts.conf 730 file. please note that ~/.fonts.conf.d is deprecated now. it will not be 731 read by default in the future version. 732 733 $XDG_CONFIG_HOME/fontconfig/fonts.conf and ~/.fonts.conf is the 734 conventional location for per-user font configuration, although the actual 735 location is specified in the global fonts.conf file. please note that 736 ~/.fonts.conf is deprecated now. it will not be read by default in the 737 future version. 738 739 $XDG_CACHE_HOME/fontconfig/*.cache-* and ~/.fontconfig/*.cache-* is the 740 conventional repository of font information that isn't found in the 741 per-directory caches. This file is automatically maintained by fontconfig. 742 please note that ~/.fontconfig/*.cache-* is deprecated now. it will not be 743 read by default in the future version. 744 745Environment variables 746 747 FONTCONFIG_FILE is used to override the default configuration file. 748 749 FONTCONFIG_PATH is used to override the default configuration directory. 750 751 FC_DEBUG is used to output the detailed debugging messages. see 752 [1]Debugging Applications section for more details. 753 754 FONTCONFIG_USE_MMAP is used to control the use of mmap(2) for the cache 755 files if available. this take a boolean value. fontconfig will checks if 756 the cache files are stored on the filesystem that is safe to use mmap(2). 757 explicitly setting this environment variable will causes skipping this 758 check and enforce to use or not use mmap(2) anyway. 759 760See Also 761 762 fc-cat(1), fc-cache(1), fc-list(1), fc-match(1), fc-query(1) 763 764Version 765 766 Fontconfig version 2.10.2 767 768References 769 770 Visible links 771 1. file:///tmp/html-aDEwSV#DEBUG 772