Fontconfig Developers Reference, Version 2.17.1

Keith Packard

   HP Cambridge Research Lab
     __________________________________________________________

   Table of Contents
   1. DESCRIPTION
   2. FUNCTIONAL OVERVIEW

        2.1. FONT CONFIGURATION
        2.2. FONT PROPERTIES

   3. Datatypes

        3.1. FcChar8, FcChar16, FcChar32, FcBool
        3.2. FcMatrix
        3.3. FcCharSet
        3.4. FcLangSet
        3.5. FcLangResult
        3.6. FcType
        3.7. FcValue
        3.8. FcPattern, FcPatternIter
        3.9. FcFontSet
        3.10. FcStrSet, FcStrList
        3.11. FcObjectSet
        3.12. FcObjectType
        3.13. FcConstant
        3.14. FcBlanks
        3.15. FcFileCache
        3.16. FcConfig
        3.17. FcSetName
        3.18. FcResult
        3.19. FcAtomic
        3.20. FcCache

   4. FUNCTIONS

        4.1. Initialization

              FcInitLoadConfig -- load configuration
              FcInitLoadConfigAndFonts -- load configuration and
                      font data

              FcInit -- initialize fontconfig library
              FcFini -- finalize fontconfig library
              FcGetVersion -- library version number
              FcInitReinitialize -- re-initialize library
              FcInitBringUptoDate -- reload configuration files if
                      needed

        4.2. FcPattern

              FcPatternCreate -- Create a pattern
              FcPatternDuplicate -- Copy a pattern
              FcPatternReference -- Increment pattern reference
                      count

              FcPatternDestroy -- Destroy a pattern
              FcPatternObjectCount -- Returns the number of the
                      object

              FcPatternEqual -- Compare patterns
              FcPatternEqualSubset -- Compare portions of patterns
              FcPatternFilter -- Filter the objects of pattern
              FcPatternHash -- Compute a pattern hash value
              FcPatternAdd -- Add a value to a pattern
              FcPatternAddWeak -- Add a value to a pattern with
                      weak binding

              FcPatternAdd-Type -- Add a typed value to a pattern
              FcPatternGetWithBinding -- Return a value with
                      binding from a pattern

              FcPatternGet -- Return a value from a pattern
              FcPatternGet-Type -- Return a typed value from a
                      pattern

              FcPatternBuild -- Create patterns from arguments
              FcPatternDel -- Delete a property from a pattern
              FcPatternRemove -- Remove one object of the
                      specified type from the pattern

              FcPatternIterStart -- Initialize the iterator with
                      the first iterator in the pattern

              FcPatternIterNext --
              FcPatternIterEqual -- Compare iterators
              FcPatternFindIter -- Set the iterator to point to
                      the object in the pattern

              FcPatternIterIsValid -- Check whether the iterator
                      is valid or not

              FcPatternIterGetObject -- Returns an object name
                      which the iterator point to

              FcPatternIterValueCount -- Returns the number of the
                      values which the iterator point to

              FcPatternIterGetValue -- Returns a value which the
                      iterator point to

              FcPatternPrint -- Print a pattern for debugging
              FcDefaultSubstitute -- Perform default substitutions
                      in a pattern

              FcConfigSetDefaultSubstitute -- Perform default
                      substitutions in a pattern

              FcNameParse -- Parse a pattern string
              FcNameUnparse -- Convert a pattern back into a
                      string that can be parsed

              FcPatternFormat -- Format a pattern into a string
                      according to a format specifier

        4.3. FcFontSet

              FcFontSetCreate -- Create a font set
              FcFontSetDestroy -- Destroy a font set
              FcFontSetAdd -- Add to a font set
              FcFontSetList -- List fonts from a set of font sets
              FcFontSetMatch -- Return the best font from a set of
                      font sets

              FcFontSetPrint -- Print a set of patterns to stdout
              FcFontSetSort -- Return list of matching fonts
              FcFontSetSortDestroy -- DEPRECATED destroy a font
                      set

        4.4. FcObjectSet

              FcObjectSetCreate -- Create an object set
              FcObjectSetAdd -- Add to an object set
              FcObjectSetDestroy -- Destroy an object set
              FcObjectSetBuild -- Build object set from args

        4.5. FreeType specific functions

              FcFreeTypeCharIndex -- map Unicode to glyph id
              FcFreeTypeCharSet -- compute Unicode coverage
              FcFreeTypeCharSetAndSpacing -- compute Unicode
                      coverage and spacing type

              FcFreeTypeQuery -- compute pattern from font file
                      (and index)

              FcFreeTypeQueryAll -- compute all patterns from font
                      file (and index)

              FcFreeTypeQueryFace -- compute pattern from FT_Face

        4.6. Fontations specific functions

              FcFontationsQueryAll -- compute all patterns from
                      font file (and index)

        4.7. FcValue

              FcValueDestroy -- Free a value
              FcValueSave -- Copy a value
              FcValuePrint -- Print a value to stdout
              FcValueEqual -- Test two values for equality

        4.8. FcCharSet

              FcCharSetCreate -- Create an empty character set
              FcCharSetDestroy -- Destroy a character set
              FcCharSetAddChar -- Add a character to a charset
              FcCharSetDelChar -- Delete a character from a
                      charset

              FcCharSetCopy -- Copy a charset
              FcCharSetEqual -- Compare two charsets
              FcCharSetIntersect -- Intersect charsets
              FcCharSetUnion -- Add charsets
              FcCharSetSubtract -- Subtract charsets
              FcCharSetMerge -- Merge charsets
              FcCharSetHasChar -- Check a charset for a char
              FcCharSetCount -- Count entries in a charset
              FcCharSetIntersectCount -- Intersect and count
                      charsets

              FcCharSetSubtractCount -- Subtract and count
                      charsets

              FcCharSetIsSubset -- Test for charset inclusion
              FcCharSetFirstPage -- Start enumerating charset
                      contents

              FcCharSetNextPage -- Continue enumerating charset
                      contents

              FcCharSetCoverage -- DEPRECATED return coverage for
                      a Unicode page

              FcCharSetNew -- DEPRECATED alias for FcCharSetCreate

        4.9. FcLangSet

              FcLangSetCreate -- create a langset object
              FcLangSetDestroy -- destroy a langset object
              FcLangSetCopy -- copy a langset object
              FcLangSetAdd -- add a language to a langset
              FcLangSetDel -- delete a language from a langset
              FcLangSetUnion -- Add langsets
              FcLangSetSubtract -- Subtract langsets
              FcLangSetCompare -- compare language sets
              FcLangSetContains -- check langset subset relation
              FcLangSetEqual -- test for matching langsets
              FcLangSetHash -- return a hash value for a langset
              FcLangSetHasLang -- test langset for language
                      support

              FcGetDefaultLangs -- Get the default languages list
              FcConfigGetDefaultLangs -- Get the default languages
                      list

              FcLangSetGetLangs -- get the list of languages in
                      the langset

              FcGetLangs -- Get list of languages
              FcLangNormalize -- Normalize the language string
              FcLangGetCharSet -- Get character map for a language

        4.10. FcMatrix

              FcMatrixInit -- initialize an FcMatrix structure
              FcMatrixCopy -- Copy a matrix
              FcMatrixEqual -- Compare two matrices
              FcMatrixMultiply -- Multiply matrices
              FcMatrixRotate -- Rotate a matrix
              FcMatrixScale -- Scale a matrix
              FcMatrixShear -- Shear a matrix

        4.11. FcRange

              FcRangeCopy -- Copy a range object
              FcRangeCreateDouble -- create a range object for
                      double

              FcRangeCreateInteger -- create a range object for
                      integer

              FcRangeDestroy -- destroy a range object
              FcRangeGetDouble -- Get the range in double

        4.12. FcConfig

              FcConfigCreate -- Create a configuration
              FcConfigReference -- Increment config reference
                      count

              FcConfigDestroy -- Destroy a configuration
              FcConfigSetCurrent -- Set configuration as default
              FcConfigGetCurrent -- Return current configuration
              FcConfigSetFontSetFilter -- Set a predicate function
                      to filter fontsets

              FcConfigAcceptFilter -- Test whether the given
                      pattern matches filter

              FcConfigUptoDate -- Check timestamps on config files
              FcConfigHome -- return the current home directory.
              FcConfigEnableHome -- controls use of the home
                      directory.

              FcConfigBuildFonts -- Build font database
              FcConfigGetConfigDirs -- Get config directories
              FcConfigGetFontDirs -- Get font directories
              FcConfigGetConfigFiles -- Get config files
              FcConfigGetCache -- DEPRECATED used to return
                      per-user cache filename

              FcConfigGetCacheDirs -- return the list of
                      directories searched for cache files

              FcConfigGetFonts -- Get config font set
              FcConfigGetBlanks -- Get config blanks
              FcConfigGetRescanInterval -- Get config rescan
                      interval

              FcConfigSetRescanInterval -- Set config rescan
                      interval

              FcConfigAppFontAddFile -- Add font file to font
                      database

              FcConfigAppFontAddDir -- Add fonts from directory to
                      font database

              FcConfigAppFontClear -- Remove all app fonts from
                      font database

              FcConfigSubstituteWithPat -- Execute substitutions
              FcConfigSubstitute -- Execute substitutions
              FcFontMatch -- Return best font
              FcFontSort -- Return list of matching fonts
              FcFontRenderPrepare -- Prepare pattern for loading
                      font file

              FcFontList -- List fonts
              FcConfigFilename -- Find a config file
              FcConfigGetFilename -- Find a config file
              FcConfigParseAndLoad -- load a configuration file
              FcConfigParseAndLoadFromMemory -- load a
                      configuration from memory

              FcConfigGetSysRoot -- Obtain the system root
                      directory

              FcConfigSetSysRoot -- Set the system root directory
              FcConfigFileInfoIterInit -- Initialize the iterator
              FcConfigFileInfoIterNext -- Set the iterator to
                      point to the next list

              FcConfigFileInfoIterGet -- Obtain the configuration
                      file information

              FcConfigAcceptFont -- Test whether the given pattern
                      matches deny list

              FcConfigPreferAppFont --

        4.13. FcObjectType

              FcNameRegisterObjectTypes -- Register object types
              FcNameUnregisterObjectTypes -- Unregister object
                      types

              FcNameGetObjectType -- Lookup an object type

        4.14. FcConstant

              FcNameRegisterConstants -- Register symbolic
                      constants

              FcNameUnregisterConstants -- Unregister symbolic
                      constants

              FcNameGetConstant -- Lookup symbolic constant
              FcNameGetConstantFor -- Lookup symbolic constant For
                      object

              FcNameConstant -- Get the value for a symbolic
                      constant

        4.15. FcWeight

              FcWeightFromOpenTypeDouble -- Convert from OpenType
                      weight values to fontconfig ones

              FcWeightToOpenTypeDouble -- Convert from fontconfig
                      weight values to OpenType ones

              FcWeightFromOpenType -- Convert from OpenType weight
                      values to fontconfig ones

              FcWeightToOpenType -- Convert from fontconfig weight
                      values to OpenType ones

        4.16. FcBlanks

              FcBlanksCreate -- Create an FcBlanks
              FcBlanksDestroy -- Destroy and FcBlanks
              FcBlanksAdd -- Add a character to an FcBlanks
              FcBlanksIsMember -- Query membership in an FcBlanks

        4.17. FcAtomic

              FcAtomicCreate -- create an FcAtomic object
              FcAtomicLock -- lock a file
              FcAtomicNewFile -- return new temporary file name
              FcAtomicOrigFile -- return original file name
              FcAtomicReplaceOrig -- replace original with new
              FcAtomicDeleteNew -- delete new file
              FcAtomicUnlock -- unlock a file
              FcAtomicDestroy -- destroy an FcAtomic object

        4.18. File and Directory routines

              FcFileScan -- scan a font file
              FcFileIsDir -- check whether a file is a directory
              FcDirScan -- scan a font directory without caching
                      it

              FcDirSave -- DEPRECATED: formerly used to save a
                      directory cache

              FcDirCacheUnlink -- Remove all caches related to dir
              FcDirCacheValid -- check directory cache
              FcDirCacheLoad -- load a directory cache
              FcDirCacheRescan -- Re-scan a directory cache
              FcDirCacheRead -- read or construct a directory
                      cache

              FcDirCacheLoadFile -- load a cache file
              FcDirCacheUnload -- unload a cache file

        4.19. FcCache routines

              FcCacheDir -- Return directory of cache
              FcCacheCopySet -- Returns a copy of the fontset from
                      cache

              FcCacheSubdir -- Return the i'th subdirectory.
              FcCacheNumSubdir -- Return the number of
                      subdirectories in cache.

              FcCacheNumFont -- Returns the number of fonts in
                      cache.

              FcDirCacheClean -- Clean up a cache directory
              FcCacheCreateTagFile -- Create CACHEDIR.TAG at cache
                      directory.

              FcDirCacheCreateUUID -- Create .uuid file at a
                      directory

              FcDirCacheDeleteUUID -- Delete .uuid file

        4.20. FcStrSet and FcStrList

              FcStrSetCreate -- create a string set
              FcStrSetMember -- check set for membership
              FcStrSetEqual -- check sets for equality
              FcStrSetAdd -- add to a string set
              FcStrSetAddFilename -- add a filename to a string
                      set

              FcStrSetDel -- delete from a string set
              FcStrSetDestroy -- destroy a string set
              FcStrListCreate -- create a string iterator
              FcStrListFirst -- get first string in iteration
              FcStrListNext -- get next string in iteration
              FcStrListDone -- destroy a string iterator

        4.21. String utilities

              FcUtf8ToUcs4 -- convert UTF-8 to UCS4
              FcUcs4ToUtf8 -- convert UCS4 to UTF-8
              FcUtf8Len -- count UTF-8 encoded chars
              FcUtf16ToUcs4 -- convert UTF-16 to UCS4
              FcUtf16Len -- count UTF-16 encoded chars
              FcIsLower -- check for lower case ASCII character
              FcIsUpper -- check for upper case ASCII character
              FcToLower -- convert upper case ASCII to lower case
              FcStrCopy -- duplicate a string
              FcStrDowncase -- create a lower case translation of
                      a string

              FcStrCopyFilename -- create a complete path from a
                      filename

              FcStrCmp -- compare UTF-8 strings
              FcStrCmpIgnoreCase -- compare UTF-8 strings ignoring
                      case

              FcStrStr -- locate UTF-8 substring
              FcStrStrIgnoreCase -- locate UTF-8 substring
                      ignoring case

              FcStrPlus -- concatenate two strings
              FcStrFree -- free a string
              FcStrBuildFilename -- Concatenate strings as a file
                      path

              FcStrDirname -- directory part of filename
              FcStrBasename -- last component of filename

1. DESCRIPTION

   Fontconfig is a library designed to provide system-wide font
   configuration, customization and application access.
     __________________________________________________________

2. FUNCTIONAL OVERVIEW

   Fontconfig contains two essential modules, the configuration
   module which builds an internal configuration from XML files
   and the matching module which accepts font patterns and returns
   the nearest matching font.
     __________________________________________________________

2.1. FONT CONFIGURATION

   The configuration module consists of the FcConfig datatype,
   libexpat and FcConfigParse which walks over an XML tree and
   amends a configuration with data found within. From an external
   perspective, configuration of the library consists of
   generating a valid XML tree and feeding that to FcConfigParse.
   The only other mechanism provided to applications for changing
   the running configuration is to add fonts and directories to
   the list of application-provided font files.

   The intent is to make font configurations relatively static,
   and shared by as many applications as possible. It is hoped
   that this will lead to more stable font selection when passing
   names from one application to another. XML was chosen as a
   configuration file format because it provides a format which is
   easy for external agents to edit while retaining the correct
   structure and syntax.

   Font configuration is separate from font matching; applications
   needing to do their own matching can access the available fonts
   from the library and perform private matching. The intent is to
   permit applications to pick and choose appropriate
   functionality from the library instead of forcing them to
   choose between this library and a private configuration
   mechanism. The hope is that this will ensure that configuration
   of fonts for all applications can be centralized in one place.
   Centralizing font configuration will simplify and regularize
   font installation and customization.
     __________________________________________________________

2.2. FONT PROPERTIES

   While font patterns may contain essentially any properties,
   there are some well known properties with associated types.
   Fontconfig uses some of these properties for font matching and
   font completion. Others are provided as a convenience for the
   application's rendering mechanism.
                 Property Definitions

    Property       C Preprocessor Symbol  Type    Description
    ----------------------------------------------------
    family         FC_FAMILY              String  Font family names
    familylang     FC_FAMILYLANG          String  Language corresponding
 to
                                                  each family name
    style          FC_STYLE               String  Font style. Overrides
weight
                                                  and slant
    stylelang      FC_STYLELANG           String  Language corresponding
 to
                                                  each style name
    fullname       FC_FULLNAME            String  Font face full name wh
ere
                                                  different from family
and
                                                  family + style
    fullnamelang   FC_FULLNAMELANG        String  Language corresponding
 to
                                                  each fullname
    slant          FC_SLANT               Int     Italic, oblique or rom
an
    weight         FC_WEIGHT              Int     Light, medium, demibol
d,
                                                  bold or black
    width          FC_WIDTH               Int     Condensed, normal or e
xpanded
    size           FC_SIZE                Double  Point size
    aspect         FC_ASPECT              Double  Stretches glyphs horiz
ontally
                                                  before hinting
    pixelsize      FC_PIXEL_SIZE          Double  Pixel size
    spacing        FC_SPACING             Int     Proportional, dual-wid
th,
                                                  monospace or charcell
    foundry        FC_FOUNDRY             String  Font foundry name
    antialias      FC_ANTIALIAS           Bool    Whether glyphs can be
                                                  antialiased
    hintstyle      FC_HINT_STYLE          Int     Automatic hinting styl
e
    hinting        FC_HINTING             Bool    Whether the rasterizer
 should
                                                  use hinting
    verticallayout FC_VERTICAL_LAYOUT     Bool    Use vertical layout
    autohint       FC_AUTOHINT            Bool    Use autohinter instead
 of
                                                  normal hinter
    globaladvance  FC_GLOBAL_ADVANCE      Bool    Use font global advanc
e data (deprecated)
    file           FC_FILE                String  The filename holding t
he font
                                                  relative to the config
's sysroot
    index          FC_INDEX               Int     The index of the font
within
                                                  the file
    ftface         FC_FT_FACE             FT_Face Use the specified Free
Type
                                                  face object
    rasterizer     FC_RASTERIZER          String  Which rasterizer is in
 use (deprecated)
    outline        FC_OUTLINE             Bool    Whether the glyphs are
 outlines
    scalable       FC_SCALABLE            Bool    Whether the glyphs are
 outlines or have color
    dpi            FC_DPI                 Double  Target dots per inch
    rgba           FC_RGBA                Int     unknown, rgb, bgr, vrg
b,
                                                  vbgr, none - subpixel
geometry
    scale          FC_SCALE               Double  Scale factor for point
->pixel
                                                  conversions (deprecate
d)
    minspace       FC_MINSPACE            Bool    Eliminate leading from
 line
                                                  spacing
    matrix         FC_MATRIX              Matrix  Hold an affine transfo
rmation
    charset        FC_CHARSET             CharSet Unicode chars encoded
by
                                                  the font
    lang           FC_LANG                LangSet Set of RFC-3066-style
                                                  languages this font su
pports
    fontversion    FC_FONTVERSION         Int     Version number of the
font
    capability     FC_CAPABILITY          String  List of layout capabil
ities in
                                                  the font
    fontformat     FC_FONTFORMAT          String  String name of the fon
t format
    embolden       FC_EMBOLDEN            Bool    Rasterizer should
                                                  synthetically embolden
 the font
    embeddedbitmap FC_EMBEDDED_BITMAP     Bool    Use the embedded bitma
p instead
                                                  of the outline
    decorative     FC_DECORATIVE          Bool    Whether the style is a
 decorative
                                                  variant
    lcdfilter      FC_LCD_FILTER          Int     Type of LCD filter
    namelang       FC_NAMELANG            String  Language name to be us
ed for the
                                                  default value of famil
ylang,
                                                  stylelang and fullname
lang
    fontfeatures   FC_FONT_FEATURES       String  List of extra feature
tags in
                                                  OpenType to be enabled
    prgname        FC_PRGNAME             String  Name of the running pr
ogram
    hash           FC_HASH                String  SHA256 hash value of t
he font data
                                                  with "sha256:" prefix
(deprecated)
    postscriptname FC_POSTSCRIPT_NAME     String  Font name in PostScrip
t
    color          FC_COLOR               Bool    Whether any glyphs hav
e color
    symbol         FC_SYMBOL              Bool    Whether font uses MS s
ymbol-font encoding
    fontvariations FC_FONT_VARIATIONS     String  comma-separated string
 of axes in variable font
    variable       FC_VARIABLE            Bool    Whether font is Variab
le Font
    fonthashint    FC_FONT_HAS_HINT       Bool    Whether font has hinti
ng
    order          FC_ORDER               Int     Order number of the fo
nt
    desktop        FC_DESKTOP_NAME        String  Current desktop name
    namedinstance  FC_NAMED_INSTANCE      Bool    Whether font is a name
d instance
    fontwarapper   FC_FONT_WRAPPER        String  The font wrapper forma
t
     __________________________________________________________

3. Datatypes

   Fontconfig uses abstract data types to hide internal
   implementation details for most data structures. A few
   structures are exposed where appropriate.
     __________________________________________________________

3.1. FcChar8, FcChar16, FcChar32, FcBool

   These are primitive data types; the FcChar* types hold
   precisely the number of bits stated (if supported by the C
   implementation). FcBool holds one of two C preprocessor
   symbols: FcFalse or FcTrue.
     __________________________________________________________

3.2. FcMatrix

   An FcMatrix holds an affine transformation, usually used to
   reshape glyphs. A small set of matrix operations are provided
   to manipulate these.
        typedef struct _FcMatrix {
                double xx, xy, yx, yy;
        } FcMatrix;
     __________________________________________________________

3.3. FcCharSet

   An FcCharSet is an abstract type that holds the set of encoded
   Unicode chars in a font. Operations to build and compare these
   sets are provided.
     __________________________________________________________

3.4. FcLangSet

   An FcLangSet is an abstract type that holds the set of
   languages supported by a font. Operations to build and compare
   these sets are provided. These are computed for a font based on
   orthographic information built into the fontconfig library.
   Fontconfig has orthographies for all of the ISO 639-1 languages
   except for MS, NA, PA, PS, QU, RN, RW, SD, SG, SN, SU and ZA.
   If you have orthographic information for any of these
   languages, please submit them.
     __________________________________________________________

3.5. FcLangResult

   An FcLangResult is an enumeration used to return the results of
   comparing two language strings or FcLangSet objects.
   FcLangEqual means the objects match language and territory.
   FcLangDifferentTerritory means the objects match in language
   but differ in territory. FcLangDifferentLang means the objects
   differ in language.
     __________________________________________________________

3.6. FcType

   Tags the kind of data stored in an FcValue.
     __________________________________________________________

3.7. FcValue

   An FcValue object holds a single value with one of a number of
   different types. The 'type' tag indicates which member is
   valid.
        typedef struct _FcValue {
                FcType type;
                union {
                        const FcChar8 *s;
                        int i;
                        FcBool b;
                        double d;
                        const FcMatrix *m;
                        const FcCharSet *c;
                        void *f;
                        const FcLangSet *l;
                        const FcRange   *r;
                } u;
        } FcValue;

                  FcValue Members

        Type            Union member    Datatype
        --------------------------------
        FcTypeVoid      (none)          (none)
        FcTypeInteger   i               int
        FcTypeDouble    d               double
        FcTypeString    s               FcChar8 *
        FcTypeBool      b               b
        FcTypeMatrix    m               FcMatrix *
        FcTypeCharSet   c               FcCharSet *
        FcTypeFTFace    f               void * (FT_Face)
        FcTypeLangSet   l               FcLangSet *
        FcTypeRange     r               FcRange *
     __________________________________________________________

3.8. FcPattern, FcPatternIter

   An FcPattern holds a set of names with associated value lists;
   each name refers to a property of a font. FcPatterns are used
   as inputs to the matching code as well as holding information
   about specific fonts. Each property can hold one or more
   values; conventionally all of the same type, although the
   interface doesn't demand that. An FcPatternIter is used during
   iteration to access properties in FcPattern.
     __________________________________________________________

3.9. FcFontSet

        typedef struct _FcFontSet {
                int nfont;
                int sfont;
                FcPattern **fonts;
        } FcFontSet;

   An FcFontSet contains a list of FcPatterns. Internally
   fontconfig uses this data structure to hold sets of fonts.
   Externally, fontconfig returns the results of listing fonts in
   this format. 'nfont' holds the number of patterns in the
   'fonts' array; 'sfont' is used to indicate the size of that
   array.
     __________________________________________________________

3.10. FcStrSet, FcStrList

   FcStrSet holds a list of strings that can be appended to and
   enumerated. Its unique characteristic is that the enumeration
   works even while strings are appended during enumeration.
   FcStrList is used during enumeration to safely and correctly
   walk the list of strings even while that list is edited in the
   middle of enumeration.
     __________________________________________________________

3.11. FcObjectSet

        typedef struct _FcObjectSet {
                int nobject;
                int sobject;
                const char **objects;
        } FcObjectSet;

   holds a set of names and is used to specify which fields from
   fonts are placed in the the list of returned patterns when
   listing fonts.
     __________________________________________________________

3.12. FcObjectType

        typedef struct _FcObjectType {
                const char *object;
                FcType type;
        } FcObjectType;

   marks the type of a pattern element generated when parsing font
   names. Applications can add new object types so that font names
   may contain the new elements.
     __________________________________________________________

3.13. FcConstant

        typedef struct _FcConstant {
            const FcChar8 *name;
            const char *object;
            int value;
        } FcConstant;

   Provides for symbolic constants for new pattern elements. When
   'name' is seen in a font name, an 'object' element is created
   with value 'value'.
     __________________________________________________________

3.14. FcBlanks

   holds a list of Unicode chars which are expected to be blank;
   unexpectedly blank chars are assumed to be invalid and are
   elided from the charset associated with the font.

   FcBlanks is deprecated and should not be used in newly written
   code. It is still accepted by some functions for compatibility
   with older code but will be removed in the future.
     __________________________________________________________

3.15. FcFileCache

   holds the per-user cache information for use while loading the
   font database. This is built automatically for the current
   configuration when that is loaded. Applications must always
   pass '0' when one is requested.
     __________________________________________________________

3.16. FcConfig

   holds a complete configuration of the library; there is one
   default configuration, other can be constructed from XML data
   structures. All public entry points that need global data can
   take an optional FcConfig* argument; passing 0 uses the default
   configuration. FcConfig objects hold two sets of fonts, the
   first contains those specified by the configuration, the second
   set holds those added by the application at run-time.
   Interfaces that need to reference a particular set use one of
   the FcSetName enumerated values.
     __________________________________________________________

3.17. FcSetName

   Specifies one of the two sets of fonts available in a
   configuration; FcSetSystem for those fonts specified in the
   configuration and FcSetApplication which holds fonts provided
   by the application.
     __________________________________________________________

3.18. FcResult

   Used as a return type for functions manipulating FcPattern
   objects.
      FcResult Values
        Result Code             Meaning
        -----------------------------------------------------------
        FcResultMatch           Object exists with the specified ID
        FcResultNoMatch         Object doesn't exist at all
        FcResultTypeMismatch    Object exists, but the type doesn't matc
h
        FcResultNoId            Object exists, but has fewer values
                                than specified
        FcResultOutOfMemory     malloc failed
     __________________________________________________________

3.19. FcAtomic

   Used for locking access to configuration files. Provides a safe
   way to update configuration files.
     __________________________________________________________

3.20. FcCache

   Holds information about the fonts contained in a single
   directory. Normal applications need not worry about this as
   caches for font access are automatically managed by the
   library. Applications dealing with cache management may want to
   use some of these objects in their work, however the included
   'fc-cache' program generally suffices for all of that.
     __________________________________________________________

4. FUNCTIONS

   These are grouped by functionality, often using the main data
   type being manipulated.
     __________________________________________________________

4.1. Initialization

   Table of Contents
   FcInitLoadConfig -- load configuration
   FcInitLoadConfigAndFonts -- load configuration and font data
   FcInit -- initialize fontconfig library
   FcFini -- finalize fontconfig library
   FcGetVersion -- library version number
   FcInitReinitialize -- re-initialize library
   FcInitBringUptoDate -- reload configuration files if needed

   These functions provide some control over how the library is
   initialized.

FcInitLoadConfig

Name

   FcInitLoadConfig -- load configuration

Synopsis

#include <fontconfig/fontconfig.h>

   FcConfig * FcInitLoadConfig(void);

Description

   Loads the default configuration file and returns the resulting
   configuration. Does not load any font information.

FcInitLoadConfigAndFonts

Name

   FcInitLoadConfigAndFonts -- load configuration and font data

Synopsis

#include <fontconfig/fontconfig.h>

   FcConfig * FcInitLoadConfigAndFonts(void);

Description

   Loads the default configuration file and builds information
   about the available fonts. Returns the resulting configuration.

FcInit

Name

   FcInit -- initialize fontconfig library

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcInit(void);

Description

   Loads the default configuration file and the fonts referenced
   therein and sets the default configuration to that result.
   Returns whether this process succeeded or not. If the default
   configuration has already been loaded, this routine does
   nothing and returns FcTrue.

FcFini

Name

   FcFini -- finalize fontconfig library

Synopsis

#include <fontconfig/fontconfig.h>

   void FcFini(void);

Description

   Frees all data structures allocated by previous calls to
   fontconfig functions. Fontconfig returns to an uninitialized
   state, requiring a new call to one of the FcInit functions
   before any other fontconfig function may be called.

FcGetVersion

Name

   FcGetVersion -- library version number

Synopsis

#include <fontconfig/fontconfig.h>

   int FcGetVersion(void);

Description

   Returns the version number of the library.

FcInitReinitialize

Name

   FcInitReinitialize -- re-initialize library

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcInitReinitialize(void);

Description

   Forces the default configuration file to be reloaded and resets
   the default configuration. Returns FcFalse if the configuration
   cannot be reloaded (due to configuration file errors,
   allocation failures or other issues) and leaves the existing
   configuration unchanged. Otherwise returns FcTrue.

FcInitBringUptoDate

Name

   FcInitBringUptoDate -- reload configuration files if needed

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcInitBringUptoDate(void);

Description

   Checks the rescan interval in the default configuration,
   checking the configuration if the interval has passed and
   reloading the configuration if when any changes are detected.
   Returns FcFalse if the configuration cannot be reloaded (see
   FcInitReinitialize). Otherwise returns FcTrue.
     __________________________________________________________

4.2. FcPattern

   Table of Contents
   FcPatternCreate -- Create a pattern
   FcPatternDuplicate -- Copy a pattern
   FcPatternReference -- Increment pattern reference count
   FcPatternDestroy -- Destroy a pattern
   FcPatternObjectCount -- Returns the number of the object
   FcPatternEqual -- Compare patterns
   FcPatternEqualSubset -- Compare portions of patterns
   FcPatternFilter -- Filter the objects of pattern
   FcPatternHash -- Compute a pattern hash value
   FcPatternAdd -- Add a value to a pattern
   FcPatternAddWeak -- Add a value to a pattern with weak binding
   FcPatternAdd-Type -- Add a typed value to a pattern
   FcPatternGetWithBinding -- Return a value with binding from a
          pattern

   FcPatternGet -- Return a value from a pattern
   FcPatternGet-Type -- Return a typed value from a pattern
   FcPatternBuild -- Create patterns from arguments
   FcPatternDel -- Delete a property from a pattern
   FcPatternRemove -- Remove one object of the specified type from
          the pattern

   FcPatternIterStart -- Initialize the iterator with the first
          iterator in the pattern

   FcPatternIterNext --
   FcPatternIterEqual -- Compare iterators
   FcPatternFindIter -- Set the iterator to point to the object in
          the pattern

   FcPatternIterIsValid -- Check whether the iterator is valid or
          not

   FcPatternIterGetObject -- Returns an object name which the
          iterator point to

   FcPatternIterValueCount -- Returns the number of the values
          which the iterator point to

   FcPatternIterGetValue -- Returns a value which the iterator
          point to

   FcPatternPrint -- Print a pattern for debugging
   FcDefaultSubstitute -- Perform default substitutions in a
          pattern

   FcConfigSetDefaultSubstitute -- Perform default substitutions
          in a pattern

   FcNameParse -- Parse a pattern string
   FcNameUnparse -- Convert a pattern back into a string that can
          be parsed

   FcPatternFormat -- Format a pattern into a string according to
          a format specifier

   An FcPattern is an opaque type that holds both patterns to
   match against the available fonts, as well as the information
   about each font.

FcPatternCreate

Name

   FcPatternCreate -- Create a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcPattern * FcPatternCreate(void);

Description

   Creates a pattern with no properties; used to build patterns
   from scratch.

FcPatternDuplicate

Name

   FcPatternDuplicate -- Copy a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcPattern * FcPatternDuplicate(const FcPattern *p);

Description

   Copy a pattern, returning a new pattern that matches p. Each
   pattern may be modified without affecting the other.

FcPatternReference

Name

   FcPatternReference -- Increment pattern reference count

Synopsis

#include <fontconfig/fontconfig.h>

   void FcPatternReference(FcPattern *p);

Description

   Add another reference to p. Patterns are freed only when the
   reference count reaches zero.

FcPatternDestroy

Name

   FcPatternDestroy -- Destroy a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   void FcPatternDestroy(FcPattern *p);

Description

   Decrement the pattern reference count. If all references are
   gone, destroys the pattern, in the process destroying all
   related values.

FcPatternObjectCount

Name

   FcPatternObjectCount -- Returns the number of the object

Synopsis

#include <fontconfig/fontconfig.h>

   int FcPatternObjectCount(const FcPattern *p);

Description

   Returns the number of the object p has.

Since

   version 2.13.1

FcPatternEqual

Name

   FcPatternEqual -- Compare patterns

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternEqual(const FcPattern *pa, const FcPattern
   *pb);

Description

   Returns whether pa and pb are exactly alike.

FcPatternEqualSubset

Name

   FcPatternEqualSubset -- Compare portions of patterns

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternEqualSubset(const FcPattern *pa, const
   FcPattern *pb, const FcObjectSet *os);

Description

   Returns whether pa and pb have exactly the same values for all
   of the objects in os.

FcPatternFilter

Name

   FcPatternFilter -- Filter the objects of pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcPattern * FcPatternFilter(FcPattern *p, const FcObjectSet
   *os);

Description

   Returns a new pattern that only has those objects from p that
   are in os. If os is NULL, a duplicate of p is returned.

FcPatternHash

Name

   FcPatternHash -- Compute a pattern hash value

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar32 FcPatternHash(const FcPattern *p);

Description

   Returns a 32-bit number which is the same for any two patterns
   which are equal.

FcPatternAdd

Name

   FcPatternAdd -- Add a value to a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternAdd(FcPattern *p, const char *object, FcValue
   value, FcBool append);

Description

   Adds a single value to the list of values associated with the
   property named `object. If `append is FcTrue, the value is
   added at the end of any existing list, otherwise it is inserted
   at the beginning. `value' is saved (with FcValueSave) when
   inserted into the pattern so that the library retains no
   reference to any application-supplied data structure.

FcPatternAddWeak

Name

   FcPatternAddWeak -- Add a value to a pattern with weak binding

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternAddWeak(FcPattern *p, const char *object,
   FcValue value, FcBool append);

Description

   FcPatternAddWeak is essentially the same as FcPatternAdd except
   that any values added to the list have binding weak instead of
   strong.

FcPatternAdd-Type

Name

   FcPatternAddInteger, FcPatternAddDouble, FcPatternAddString,
   FcPatternAddMatrix, FcPatternAddCharSet, FcPatternAddBool,
   FcPatternAddFTFace, FcPatternAddLangSet,
   FcPatternAddRange -- Add a typed value to a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternAddInteger(FcPattern *p, const char *object,
   int i);

   FcBool FcPatternAddDouble(FcPattern *p, const char *object,
   double d);

   FcBool FcPatternAddString(FcPattern *p, const char *object,
   const FcChar8 *s);

   FcBool FcPatternAddMatrix(FcPattern *p, const char *object,
   const FcMatrix *m);

   FcBool FcPatternAddCharSet(FcPattern *p, const char *object,
   const FcCharSet *c);

   FcBool FcPatternAddBool(FcPattern *p, const char *object,
   FcBool b);

   FcBool FcPatternAddFTFace(FcPattern *p, const char *object,
   const FT_Face f);

   FcBool FcPatternAddLangSet(FcPattern *p, const char *object,
   const FcLangSet *l);

   FcBool FcPatternAddRange(FcPattern *p, const char *object,
   const FcRange *r);

Description

   These are all convenience functions that insert objects of the
   specified type into the pattern. Use these in preference to
   FcPatternAdd as they will provide compile-time typechecking.
   These all append values to any existing list of values.
   FcPatternAddRange are available since 2.11.91.

FcPatternGetWithBinding

Name

   FcPatternGetWithBinding -- Return a value with binding from a
   pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcResult FcPatternGetWithBinding(FcPattern *p, const char
   *object, int id, FcValue *v, FcValueBinding *b);

Description

   Returns in v the id'th value and b binding for that associated
   with the property object. The Value returned is not a copy, but
   rather refers to the data stored within the pattern directly.
   Applications must not free this value.

Since

   version 2.12.5

FcPatternGet

Name

   FcPatternGet -- Return a value from a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcResult FcPatternGet(FcPattern *p, const char *object, int id,
   FcValue *v);

Description

   Returns in v the id'th value associated with the property
   object. The value returned is not a copy, but rather refers to
   the data stored within the pattern directly. Applications must
   not free this value.

FcPatternGet-Type

Name

   FcPatternGetInteger, FcPatternGetDouble, FcPatternGetString,
   FcPatternGetMatrix, FcPatternGetCharSet, FcPatternGetBool,
   FcPatternGetFTFace, FcPatternGetLangSet,
   FcPatternGetRange -- Return a typed value from a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcResult FcPatternGetInteger(FcPattern *p, const char *object,
   int n, int *i);

   FcResult FcPatternGetDouble(FcPattern *p, const char *object,
   int n, double *d);

   FcResult FcPatternGetString(FcPattern *p, const char *object,
   int n, FcChar8 **s);

   FcResult FcPatternGetMatrix(FcPattern *p, const char *object,
   int n, FcMatrix **s);

   FcResult FcPatternGetCharSet(FcPattern *p, const char *object,
   int n, FcCharSet **c);

   FcResult FcPatternGetBool(FcPattern *p, const char *object, int
   n, FcBool *b);

   FcResult FcPatternGetFTFace(FcPattern *p, const char *object,
   int n, FT_Face *f);

   FcResult FcPatternGetLangSet(FcPattern *p, const char *object,
   int n, FcLangSet **l);

   FcResult FcPatternGetRange(FcPattern *p, const char *object,
   int n, FcRange **r);

Description

   These are convenience functions that call FcPatternGet and
   verify that the returned data is of the expected type. They
   return FcResultTypeMismatch if this is not the case. Note that
   these (like FcPatternGet) do not make a copy of any data
   structure referenced by the return value. Use these in
   preference to FcPatternGet to provide compile-time
   typechecking. FcPatternGetRange are available since 2.11.91.

FcPatternBuild

Name

   FcPatternBuild, FcPatternVaBuild, FcPatternVapBuild -- Create
   patterns from arguments

Synopsis

#include <fontconfig/fontconfig.h>

   FcPattern * FcPatternBuild(FcPattern *pattern, ...);

   FcPattern * FcPatternVaBuild(FcPattern *pattern, va_list va);

   void FcPatternVapBuild(FcPattern *result, FcPattern *pattern,
   va_list va);

Description

   Builds a pattern using a list of objects, types and values.
   Each value to be entered in the pattern is specified with three
   arguments:

    1. Object name, a string describing the property to be added.
    2. Object type, one of the FcType enumerated values
    3. Value, not an FcValue, but the raw type as passed to any of
       the FcPatternAdd<type> functions. Must match the type of
       the second argument.

   The argument list is terminated by a null object name, no
   object type nor value need be passed for this. The values are
   added to `pattern', if `pattern' is null, a new pattern is
   created. In either case, the pattern is returned. Example
pattern = FcPatternBuild (0, FC_FAMILY, FcTypeString, "Times", (char *)
0);

   FcPatternVaBuild is used when the arguments are already in the
   form of a varargs value. FcPatternVapBuild is a macro version
   of FcPatternVaBuild which returns its result directly in the
   result variable.

FcPatternDel

Name

   FcPatternDel -- Delete a property from a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternDel(FcPattern *p, const char *object);

Description

   Deletes all values associated with the property `object',
   returning whether the property existed or not.

FcPatternRemove

Name

   FcPatternRemove -- Remove one object of the specified type from
   the pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternRemove(FcPattern *p, const char *object, int
   id);

Description

   Removes the value associated with the property `object' at
   position `id', returning whether the property existed and had a
   value at that position or not.

FcPatternIterStart

Name

   FcPatternIterStart -- Initialize the iterator with the first
   iterator in the pattern

Synopsis

#include <fontconfig/fontconfig.h>

   void FcPatternIterStart(const FcPattern *p, FcPatternIter
   *iter);

Description

   Initialize iter with the first iterator in p. If there are no
   objects in p, iter will not have any valid data.

Since

   version 2.13.1

FcPatternIterNext

Name

   FcPatternIterNext --

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternIterNext(const FcPattern *p, FcPatternIter
   *iter);

Description

   Set iter to point to the next object in p and returns FcTrue if
   iter has been changed to the next object. returns FcFalse
   otherwise.

Since

   version 2.13.1

FcPatternIterEqual

Name

   FcPatternIterEqual -- Compare iterators

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternIterEqual(const FcPattern *p1, FcPatternIter
   *i1, const FcPattern *p2, FcPatternIter *i2);

Description

   Return FcTrue if both i1 and i2 point to same object and
   contains same values. return FcFalse otherwise.

Since

   version 2.13.1

FcPatternFindIter

Name

   FcPatternFindIter -- Set the iterator to point to the object in
   the pattern

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternFindIter(const FcPattern *p, FcPatternIter
   *iter, const char *object);

Description

   Set iter to point to object in p if any and returns FcTrue.
   returns FcFalse otherwise.

Since

   version 2.13.1

FcPatternIterIsValid

Name

   FcPatternIterIsValid -- Check whether the iterator is valid or
   not

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcPatternIterIsValid(const FcPattern *p, FcPatternIter
   :iter);

Description

   Returns FcTrue if iter point to the valid entry in p. returns
   FcFalse otherwise.

Since

   version 2.13.1

FcPatternIterGetObject

Name

   FcPatternIterGetObject -- Returns an object name which the
   iterator point to

Synopsis

#include <fontconfig/fontconfig.h>

   const char * FcPatternIterGetObject(const FcPattern *p,
   FcPatternIter *iter);

Description

   Returns an object name in p which iter point to. returns NULL
   if iter isn't valid.

Since

   version 2.13.1

FcPatternIterValueCount

Name

   FcPatternIterValueCount -- Returns the number of the values
   which the iterator point to

Synopsis

#include <fontconfig/fontconfig.h>

   int FcPatternIterValueCount(const FcPattern *p, FcPatternIter
   *iter);

Description

   Returns the number of the values in the object which iter point
   to. if iter isn't valid, returns 0.

Since

   version 2.13.1

FcPatternIterGetValue

Name

   FcPatternIterGetValue -- Returns a value which the iterator
   point to

Synopsis

#include <fontconfig/fontconfig.h>

   FcResult FcPatternIterGetValue(const FcPattern *p,
   FcPatternIter *iter, int id, FcValue *v, FcValueBinding *b);

Description

   Returns in v the id'th value which iter point to. also binding
   to b if given. The value returned is not a copy, but rather
   refers to the data stored within the pattern directly.
   Applications must not free this value.

Since

   version 2.13.1

FcPatternPrint

Name

   FcPatternPrint -- Print a pattern for debugging

Synopsis

#include <fontconfig/fontconfig.h>

   void FcPatternPrint(const FcPattern *p);

Description

   Prints an easily readable version of the pattern to stdout.
   There is no provision for reparsing data in this format, it's
   just for diagnostics and debugging.

FcDefaultSubstitute

Name

   FcDefaultSubstitute -- Perform default substitutions in a
   pattern

Synopsis

#include <fontconfig/fontconfig.h>

   void FcDefaultSubstitute(FcPattern *pattern);

Description

   Supplies default values for underspecified font patterns:

     * Patterns without a specified style or weight are set to
       Medium
     * Patterns without a specified style or slant are set to
       Roman
     * Patterns without a specified pixel size are given one
       computed from any specified point size (default 12), dpi
       (default 75) and scale (default 1).

   This function has been replaced by FcConfigSetDefaultSubstitute
   and will be deprecated.

FcConfigSetDefaultSubstitute

Name

   FcConfigSetDefaultSubstitute -- Perform default substitutions
   in a pattern

Synopsis

#include <fontconfig/fontconfig.h>

   void FcConfigSetDefaultSubstitute(FcConfig *config, FcPattern
   *pattern);

Description

   Supplies default values for underspecified font patterns:

     * Patterns without a specified style or weight are set to
       Medium
     * Patterns without a specified style or slant are set to
       Roman
     * Patterns without a specified pixel size are given one
       computed from any specified point size (default 12), dpi
       (default 75) and scale (default 1).

Since

   version 2.17.0

FcNameParse

Name

   FcNameParse -- Parse a pattern string

Synopsis

#include <fontconfig/fontconfig.h>

   FcPattern * FcNameParse(const FcChar8 *name);

Description

   Converts name from the standard text format described above
   into a pattern.

FcNameUnparse

Name

   FcNameUnparse -- Convert a pattern back into a string that can
   be parsed

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcNameUnparse(FcPattern *pat);

Description

   Converts the given pattern into the standard text format
   described above. The return value is not static, but instead
   refers to newly allocated memory which should be freed by the
   caller using free().

FcPatternFormat

Name

   FcPatternFormat -- Format a pattern into a string according to
   a format specifier

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcPatternFormat(FcPattern *pat, const FcChar8
   *format);

Description

   Converts given pattern pat into text described by the format
   specifier format. The return value refers to newly allocated
   memory which should be freed by the caller using free(), or
   NULL if format is invalid.

   The format is loosely modeled after printf-style format string.
   The format string is composed of zero or more directives:
   ordinary characters (not "%"), which are copied unchanged to
   the output stream; and tags which are interpreted to construct
   text from the pattern in a variety of ways (explained below).
   Special characters can be escaped using backslash. C-string
   style special characters like \n and \r are also supported
   (this is useful when the format string is not a C string
   literal). It is advisable to always escape curly braces that
   are meant to be copied to the output as ordinary characters.

   Each tag is introduced by the character "%", followed by an
   optional minimum field width, followed by tag contents in curly
   braces ({}). If the minimum field width value is provided the
   tag will be expanded and the result padded to achieve the
   minimum width. If the minimum field width is positive, the
   padding will right-align the text. Negative field width will
   left-align. The rest of this section describes various
   supported tag contents and their expansion.

   A simple tag is one where the content is an identifier. When
   simple tags are expanded, the named identifier will be looked
   up in pattern and the resulting list of values returned, joined
   together using comma. For example, to print the family name and
   style of the pattern, use the format "%{family} %{style}\n". To
   extend the family column to forty characters use
   "%-40{family}%{style}\n".

   Simple tags expand to list of all values for an element. To
   only choose one of the values, one can index using the syntax
   "%{elt[idx]}". For example, to get the first family name only,
   use "%{family[0]}".

   If a simple tag ends with "=" and the element is found in the
   pattern, the name of the element followed by "=" will be output
   before the list of values. For example, "%{weight=}" may expand
   to the string "weight=80". Or to the empty string if pattern
   does not have weight set.

   If a simple tag starts with ":" and the element is found in the
   pattern, ":" will be printed first. For example, combining this
   with the =, the format "%{:weight=}" may expand to ":weight=80"
   or to the empty string if pattern does not have weight set.

   If a simple tag contains the string ":-", the rest of the the
   tag contents will be used as a default string. The default
   string is output if the element is not found in the pattern.
   For example, the format "%{:weight=:-123}" may expand to
   ":weight=80" or to the string ":weight=123" if pattern does not
   have weight set.

   A count tag is one that starts with the character "#" followed
   by an element name, and expands to the number of values for the
   element in the pattern. For example, "%{#family}" expands to
   the number of family names pattern has set, which may be zero.

   A sub-expression tag is one that expands a sub-expression. The
   tag contents are the sub-expression to expand placed inside
   another set of curly braces. Sub-expression tags are useful for
   aligning an entire sub-expression, or to apply converters
   (explained later) to the entire sub-expression output. For
   example, the format "%40{{%{family} %{style}}}" expands the
   sub-expression to construct the family name followed by the
   style, then takes the entire string and pads it on the left to
   be at least forty characters.

   A filter-out tag is one starting with the character "-"
   followed by a comma-separated list of element names, followed
   by a sub-expression enclosed in curly braces. The
   sub-expression will be expanded but with a pattern that has the
   listed elements removed from it. For example, the format
   "%{-size,pixelsize{sub-expr}}" will expand "sub-expr" with
   pattern sans the size and pixelsize elements.

   A filter-in tag is one starting with the character "+" followed
   by a comma-separated list of element names, followed by a
   sub-expression enclosed in curly braces. The sub-expression
   will be expanded but with a pattern that only has the listed
   elements from the surrounding pattern. For example, the format
   "%{+family,familylang{sub-expr}}" will expand "sub-expr" with a
   sub-pattern consisting only the family and family lang elements
   of pattern.

   A conditional tag is one starting with the character "?"
   followed by a comma-separated list of element conditions,
   followed by two sub-expression enclosed in curly braces. An
   element condition can be an element name, in which case it
   tests whether the element is defined in pattern, or the
   character "!" followed by an element name, in which case the
   test is negated. The conditional passes if all the element
   conditions pass. The tag expands the first sub-expression if
   the conditional passes, and expands the second sub-expression
   otherwise. For example, the format
   "%{?size,dpi,!pixelsize{pass}{fail}}" will expand to "pass" if
   pattern has size and dpi elements but no pixelsize element, and
   to "fail" otherwise.

   An enumerate tag is one starting with the string "[]" followed
   by a comma-separated list of element names, followed by a
   sub-expression enclosed in curly braces. The list of values for
   the named elements are walked in parallel and the
   sub-expression expanded each time with a pattern just having a
   single value for those elements, starting from the first value
   and continuing as long as any of those elements has a value.
   For example, the format "%{[]family,familylang{%{family}
   (%{familylang})\n}}" will expand the pattern "%{family}
   (%{familylang})\n" with a pattern having only the first value
   of the family and familylang elements, then expands it with the
   second values, then the third, etc.

   As a special case, if an enumerate tag has only one element,
   and that element has only one value in the pattern, and that
   value is of type FcLangSet, the individual languages in the
   language set are enumerated.

   A builtin tag is one starting with the character "=" followed
   by a builtin name. The following builtins are defined:

   unparse
          Expands to the result of calling FcNameUnparse() on the
          pattern.

   fcmatch
          Expands to the output of the default output format of
          the fc-match command on the pattern, without the final
          newline.

   fclist
          Expands to the output of the default output format of
          the fc-list command on the pattern, without the final
          newline.

   fccat
          Expands to the output of the default output format of
          the fc-cat command on the pattern, without the final
          newline.

   pkgkit
          Expands to the list of PackageKit font() tags for the
          pattern. Currently this includes tags for each family
          name, and each language from the pattern, enumerated and
          sanitized into a set of tags terminated by newline.
          Package management systems can use these tags to tag
          their packages accordingly.

   For example, the format "%{+family,style{%{=unparse}}}\n" will
   expand to an unparsed name containing only the family and style
   element values from pattern.

   The contents of any tag can be followed by a set of zero or
   more converters. A converter is specified by the character "|"
   followed by the converter name and arguments. The following
   converters are defined:

   basename
          Replaces text with the results of calling
          FcStrBasename() on it.

   dirname
          Replaces text with the results of calling FcStrDirname()
          on it.

   downcase
          Replaces text with the results of calling
          FcStrDowncase() on it.

   shescape
          Escapes text for one level of shell expansion. (Escapes
          single-quotes, also encloses text in single-quotes.)

   cescape
          Escapes text such that it can be used as part of a C
          string literal. (Escapes backslash and double-quotes.)

   xmlescape
          Escapes text such that it can be used in XML and HTML.
          (Escapes less-than, greater-than, and ampersand.)

   delete(chars)
          Deletes all occurrences of each of the characters in
          chars from the text. FIXME: This converter is not UTF-8
          aware yet.

   escape(chars)
          Escapes all occurrences of each of the characters in
          chars by prepending it by the first character in chars.
          FIXME: This converter is not UTF-8 aware yet.

   translate(from,to)
          Translates all occurrences of each of the characters in
          from by replacing them with their corresponding
          character in to. If to has fewer characters than from,
          it will be extended by repeating its last character.
          FIXME: This converter is not UTF-8 aware yet.

   For example, the format "%{family|downcase|delete( )}\n" will
   expand to the values of the family element in pattern,
   lower-cased and with spaces removed.

Since

   version 2.9.0
     __________________________________________________________

4.3. FcFontSet

   Table of Contents
   FcFontSetCreate -- Create a font set
   FcFontSetDestroy -- Destroy a font set
   FcFontSetAdd -- Add to a font set
   FcFontSetList -- List fonts from a set of font sets
   FcFontSetMatch -- Return the best font from a set of font sets
   FcFontSetPrint -- Print a set of patterns to stdout
   FcFontSetSort -- Return list of matching fonts
   FcFontSetSortDestroy -- DEPRECATED destroy a font set

   An FcFontSet simply holds a list of patterns; these are used to
   return the results of listing available fonts.

FcFontSetCreate

Name

   FcFontSetCreate -- Create a font set

Synopsis

#include <fontconfig/fontconfig.h>

   FcFontSet * FcFontSetCreate(void);

Description

   Creates an empty font set.

FcFontSetDestroy

Name

   FcFontSetDestroy -- Destroy a font set

Synopsis

#include <fontconfig/fontconfig.h>

   void FcFontSetDestroy(FcFontSet *s);

Description

   Destroys a font set. Note that this destroys any referenced
   patterns as well.

FcFontSetAdd

Name

   FcFontSetAdd -- Add to a font set

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcFontSetAdd(FcFontSet *s, FcPattern *font);

Description

   Adds a pattern to a font set. Note that the pattern is not
   copied before being inserted into the set. Returns FcFalse if
   the pattern cannot be inserted into the set (due to allocation
   failure). Otherwise returns FcTrue.

FcFontSetList

Name

   FcFontSetList -- List fonts from a set of font sets

Synopsis

#include <fontconfig/fontconfig.h>

   FcFontSet * FcFontSetList(FcConfig *config, FcFontSet **sets,
   int nsets, FcPattern *pattern, FcObjectSet *object_set);

Description

   Selects fonts matching pattern from sets, creates patterns from
   those fonts containing only the objects in object_set and
   returns the set of unique such patterns. If config is NULL, the
   default configuration is checked to be up to date, and used.

FcFontSetMatch

Name

   FcFontSetMatch -- Return the best font from a set of font sets

Synopsis

#include <fontconfig/fontconfig.h>

   FcPattern * FcFontSetMatch(FcConfig *config, FcFontSet **sets,
   int nsets, FcPattern *pattern, FcResult *result);

Description

   Finds the font in sets most closely matching pattern and
   returns the result of FcFontRenderPrepare for that font and the
   provided pattern. This function should be called only after
   FcConfigSubstitute and FcDefaultSubstitute have been called for
   pattern; otherwise the results will not be correct. If config
   is NULL, the current configuration is used. Returns NULL if an
   error occurs during this process.

FcFontSetPrint

Name

   FcFontSetPrint -- Print a set of patterns to stdout

Synopsis

#include <fontconfig/fontconfig.h>

   void FcFontSetPrint(FcFontSet *set);

Description

   This function is useful for diagnosing font related issues,
   printing the complete contents of every pattern in set. The
   format of the output is designed to be of help to users and
   developers, and may change at any time.

FcFontSetSort

Name

   FcFontSetSort -- Return list of matching fonts

Synopsis

#include <fontconfig/fontconfig.h>

   FcFontSet * FcFontSetSort(FcConfig *config, FcFontSet **sets,
   int nsets, FcPattern *pattern, FcBool trim, FcCharSet **csp,
   FcResult *result);

Description

   Returns the list of fonts from sets sorted by closeness to
   pattern. If trim is FcTrue, elements in the list which don't
   include Unicode coverage not provided by earlier elements in
   the list are elided. The union of Unicode coverage of all of
   the fonts is returned in csp, if csp is not NULL. This function
   should be called only after FcConfigSubstitute and
   FcDefaultSubstitute have been called for p; otherwise the
   results will not be correct.

   The returned FcFontSet references FcPattern structures which
   may be shared by the return value from multiple FcFontSort
   calls, applications cannot modify these patterns. Instead, they
   should be passed, along with pattern to FcFontRenderPrepare
   which combines them into a complete pattern.

   The FcFontSet returned by FcFontSetSort is destroyed by calling
   FcFontSetDestroy.

FcFontSetSortDestroy

Name

   FcFontSetSortDestroy -- DEPRECATED destroy a font set

Synopsis

#include <fontconfig/fontconfig.h>

   void FcFontSetSortDestroy(FcFontSet *set);

Description

   This function is DEPRECATED. FcFontSetSortDestroy destroys set
   by calling FcFontSetDestroy. Applications should use
   FcFontSetDestroy directly instead.
     __________________________________________________________

4.4. FcObjectSet

   Table of Contents
   FcObjectSetCreate -- Create an object set
   FcObjectSetAdd -- Add to an object set
   FcObjectSetDestroy -- Destroy an object set
   FcObjectSetBuild -- Build object set from args

   An FcObjectSet holds a list of pattern property names; it is
   used to indicate which properties are to be returned in the
   patterns from FcFontList.

FcObjectSetCreate

Name

   FcObjectSetCreate -- Create an object set

Synopsis

#include <fontconfig/fontconfig.h>

   FcObjectSet * FcObjectSetCreate(void);

Description

   Creates an empty set.

FcObjectSetAdd

Name

   FcObjectSetAdd -- Add to an object set

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcObjectSetAdd(FcObjectSet *os, const char *object);

Description

   Adds a property name to the set. Returns FcFalse if the
   property name cannot be inserted into the set (due to
   allocation failure). Otherwise returns FcTrue.

FcObjectSetDestroy

Name

   FcObjectSetDestroy -- Destroy an object set

Synopsis

#include <fontconfig/fontconfig.h>

   void FcObjectSetDestroy(FcObjectSet *os);

Description

   Destroys an object set.

FcObjectSetBuild

Name

   FcObjectSetBuild, FcObjectSetVaBuild,
   FcObjectSetVapBuild -- Build object set from args

Synopsis

#include <fontconfig/fontconfig.h>

   FcObjectSet * FcObjectSetBuild(const char *first, ...);

   FcObjectSet * FcObjectSetVaBuild(const char *first, va_list
   va);

   void FcObjectSetVapBuild(FcObjectSet *result, const char
   *first, va_list va);

Description

   These build an object set from a null-terminated list of
   property names. FcObjectSetVapBuild is a macro version of
   FcObjectSetVaBuild which returns the result in the result
   variable directly.
     __________________________________________________________

4.5. FreeType specific functions

   Table of Contents
   FcFreeTypeCharIndex -- map Unicode to glyph id
   FcFreeTypeCharSet -- compute Unicode coverage
   FcFreeTypeCharSetAndSpacing -- compute Unicode coverage and
          spacing type

   FcFreeTypeQuery -- compute pattern from font file (and index)
   FcFreeTypeQueryAll -- compute all patterns from font file (and
          index)

   FcFreeTypeQueryFace -- compute pattern from FT_Face

   While the fontconfig library doesn't insist that FreeType be
   used as the rasterization mechanism for fonts, it does provide
   some convenience functions.

FcFreeTypeCharIndex

Name

   FcFreeTypeCharIndex -- map Unicode to glyph id

Synopsis

#include <fontconfig.h>
#include <fcfreetype.h>

   FT_UInt FcFreeTypeCharIndex(FT_Face face, FcChar32 ucs4);

Description

   Maps a Unicode char to a glyph index. This function uses
   information from several possible underlying encoding tables to
   work around broken fonts. As a result, this function isn't
   designed to be used in performance sensitive areas; results
   from this function are intended to be cached by higher level
   functions.

FcFreeTypeCharSet

Name

   FcFreeTypeCharSet -- compute Unicode coverage

Synopsis

#include <fontconfig.h>
#include <fcfreetype.h>

   FcCharSet * FcFreeTypeCharSet(FT_Face face, FcBlanks *blanks);

Description

   Scans a FreeType face and returns the set of encoded Unicode
   chars. FcBlanks is deprecated, blanks is ignored and accepted
   only for compatibility with older code.

FcFreeTypeCharSetAndSpacing

Name

   FcFreeTypeCharSetAndSpacing -- compute Unicode coverage and
   spacing type

Synopsis

#include <fontconfig.h>
#include <fcfreetype.h>

   FcCharSet * FcFreeTypeCharSetAndSpacing(FT_Face face, FcBlanks
   *blanks, int *spacing);

Description

   Scans a FreeType face and returns the set of encoded Unicode
   chars. FcBlanks is deprecated, blanks is ignored and accepted
   only for compatibility with older code. spacing receives the
   computed spacing type of the font, one of FC_MONO for a font
   where all glyphs have the same width, FC_DUAL, where the font
   has glyphs in precisely two widths, one twice as wide as the
   other, or FC_PROPORTIONAL where the font has glyphs of many
   widths.

FcFreeTypeQuery

Name

   FcFreeTypeQuery -- compute pattern from font file (and index)

Synopsis

#include <fontconfig.h>
#include <fcfreetype.h>

   FcPattern * FcFreeTypeQuery(const FcChar8 *file, int id,
   FcBlanks *blanks, int *count);

Description

   Constructs a pattern representing the 'id'th face in 'file'.
   The number of faces in 'file' is returned in 'count'. FcBlanks
   is deprecated, blanks is ignored and accepted only for
   compatibility with older code.

FcFreeTypeQueryAll

Name

   FcFreeTypeQueryAll -- compute all patterns from font file (and
   index)

Synopsis

#include <fontconfig.h>
#include <fcfreetype.h>

   unsigned int FcFreeTypeQueryAll(const FcChar8 *file, int id,
   FcBlanks *blanks, int *count, FcFontSet *set);

Description

   Constructs patterns found in 'file'. If id is -1, then all
   patterns found in 'file' are added to 'set'. Otherwise, this
   function works exactly like FcFreeTypeQuery(). The number of
   faces in 'file' is returned in 'count'. The number of patterns
   added to 'set' is returned. FcBlanks is deprecated, blanks is
   ignored and accepted only for compatibility with older code.

Since

   version 2.12.91

FcFreeTypeQueryFace

Name

   FcFreeTypeQueryFace -- compute pattern from FT_Face

Synopsis

#include <fontconfig.h>
#include <fcfreetype.h>

   FcPattern * FcFreeTypeQueryFace(const FT_Face face, const
   FcChar8 *file, int id, FcBlanks *blanks);

Description

   Constructs a pattern representing 'face'. 'file' and 'id' are
   used solely as data for pattern elements (FC_FILE, FC_INDEX and
   sometimes FC_FAMILY). FcBlanks is deprecated, blanks is ignored
   and accepted only for compatibility with older code.
     __________________________________________________________

4.6. Fontations specific functions

   Table of Contents
   FcFontationsQueryAll -- compute all patterns from font file
          (and index)

   For font indexing, an alternative backend based on the
   Fontations set of font libraries is in development. The
   indexing functions are exposed as Fontations specific
   functions.

FcFontationsQueryAll

Name

   FcFontationsQueryAll -- compute all patterns from font file
   (and index)

Synopsis

#include <fontconfig.h>
#include <fcfontations.h>

   unsigned int FcFontationsQueryAll(const FcChar8 *file, int id,
   FcBlanks *blanks, int *count, FcFontSet *set);

Description

   UNSTABLE feature. Constructs patterns found in 'file'.
   Currently pattern is incomplete compared to
   FcFreeTypeQueryAll() and may deviate from what FreeType
   indexing produces. Not supported yet, but will follow: If id is
   -1, then all patterns found in 'file' are added to 'set'.
   Otherwise, this function works exactly like
   FcFreeTypeQueryAll()/FcFreeTypeQuery(). The number of faces in
   'file' is returned in 'count'. The number of patterns added to
   'set' is returned. FcBlanks is deprecated, blanks is ignored
   and accepted only for compatibility with older code.

Since

   version 2.17.0
     __________________________________________________________

4.7. FcValue

   Table of Contents
   FcValueDestroy -- Free a value
   FcValueSave -- Copy a value
   FcValuePrint -- Print a value to stdout
   FcValueEqual -- Test two values for equality

   FcValue is a structure containing a type tag and a union of all
   possible datatypes. The tag is an enum of type FcType and is
   intended to provide a measure of run-time typechecking,
   although that depends on careful programming.

FcValueDestroy

Name

   FcValueDestroy -- Free a value

Synopsis

#include <fontconfig/fontconfig.h>

   void FcValueDestroy(FcValue v);

Description

   Frees any memory referenced by v. Values of type FcTypeString,
   FcTypeMatrix and FcTypeCharSet reference memory, the other
   types do not.

FcValueSave

Name

   FcValueSave -- Copy a value

Synopsis

#include <fontconfig/fontconfig.h>

   FcValue FcValueSave(FcValue v);

Description

   Returns a copy of v duplicating any object referenced by it so
   that v may be safely destroyed without harming the new value.

FcValuePrint

Name

   FcValuePrint -- Print a value to stdout

Synopsis

#include <fontconfig/fontconfig.h>

   void FcValuePrint(FcValue v);

Description

   Prints a human-readable representation of v to stdout. The
   format should not be considered part of the library
   specification as it may change in the future.

FcValueEqual

Name

   FcValueEqual -- Test two values for equality

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcValueEqual(FcValue v_a, FcValue v_b);

Description

   Compares two values. Integers and Doubles are compared as
   numbers; otherwise the two values have to be the same type to
   be considered equal. Strings are compared ignoring case.
     __________________________________________________________

4.8. FcCharSet

   Table of Contents
   FcCharSetCreate -- Create an empty character set
   FcCharSetDestroy -- Destroy a character set
   FcCharSetAddChar -- Add a character to a charset
   FcCharSetDelChar -- Delete a character from a charset
   FcCharSetCopy -- Copy a charset
   FcCharSetEqual -- Compare two charsets
   FcCharSetIntersect -- Intersect charsets
   FcCharSetUnion -- Add charsets
   FcCharSetSubtract -- Subtract charsets
   FcCharSetMerge -- Merge charsets
   FcCharSetHasChar -- Check a charset for a char
   FcCharSetCount -- Count entries in a charset
   FcCharSetIntersectCount -- Intersect and count charsets
   FcCharSetSubtractCount -- Subtract and count charsets
   FcCharSetIsSubset -- Test for charset inclusion
   FcCharSetFirstPage -- Start enumerating charset contents
   FcCharSetNextPage -- Continue enumerating charset contents
   FcCharSetCoverage -- DEPRECATED return coverage for a Unicode
          page

   FcCharSetNew -- DEPRECATED alias for FcCharSetCreate

   An FcCharSet is a boolean array indicating a set of Unicode
   chars. Those associated with a font are marked constant and
   cannot be edited. FcCharSets may be reference counted
   internally to reduce memory consumption; this may be visible to
   applications as the result of FcCharSetCopy may return it's
   argument, and that CharSet may remain unmodifiable.

FcCharSetCreate

Name

   FcCharSetCreate -- Create an empty character set

Synopsis

#include <fontconfig/fontconfig.h>

   FcCharSet * FcCharSetCreate(void);

Description

   FcCharSetCreate allocates and initializes a new empty character
   set object.

FcCharSetDestroy

Name

   FcCharSetDestroy -- Destroy a character set

Synopsis

#include <fontconfig/fontconfig.h>

   void FcCharSetDestroy(FcCharSet *fcs);

Description

   FcCharSetDestroy decrements the reference count fcs. If the
   reference count becomes zero, all memory referenced is freed.

FcCharSetAddChar

Name

   FcCharSetAddChar -- Add a character to a charset

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcCharSetAddChar(FcCharSet *fcs, FcChar32 ucs4);

Description

   FcCharSetAddChar adds a single Unicode char to the set,
   returning FcFalse on failure, either as a result of a constant
   set or from running out of memory.

FcCharSetDelChar

Name

   FcCharSetDelChar -- Delete a character from a charset

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcCharSetDelChar(FcCharSet *fcs, FcChar32 ucs4);

Description

   FcCharSetDelChar deletes a single Unicode char from the set,
   returning FcFalse on failure, either as a result of a constant
   set or from running out of memory.

Since

   version 2.9.0

FcCharSetCopy

Name

   FcCharSetCopy -- Copy a charset

Synopsis

#include <fontconfig/fontconfig.h>

   FcCharSet * FcCharSetCopy(FcCharSet *src);

Description

   Makes a copy of src; note that this may not actually do
   anything more than increment the reference count on src.

FcCharSetEqual

Name

   FcCharSetEqual -- Compare two charsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcCharSetEqual(const FcCharSet *a, const FcCharSet *b);

Description

   Returns whether a and b contain the same set of Unicode chars.

FcCharSetIntersect

Name

   FcCharSetIntersect -- Intersect charsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcCharSet * FcCharSetIntersect(const FcCharSet *a, const
   FcCharSet *b);

Description

   Returns a set including only those chars found in both a and b.

FcCharSetUnion

Name

   FcCharSetUnion -- Add charsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcCharSet * FcCharSetUnion(const FcCharSet *a, const FcCharSet
   *b);

Description

   Returns a set including only those chars found in either a or
   b.

FcCharSetSubtract

Name

   FcCharSetSubtract -- Subtract charsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcCharSet * FcCharSetSubtract(const FcCharSet *a, const
   FcCharSet *b);

Description

   Returns a set including only those chars found in a but not b.

FcCharSetMerge

Name

   FcCharSetMerge -- Merge charsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcCharSetMerge(FcCharSet *a, const FcCharSet *b, FcBool
   *changed);

Description

   Adds all chars in b to a. In other words, this is an in-place
   version of FcCharSetUnion. If changed is not NULL, then it
   returns whether any new chars from b were added to a. Returns
   FcFalse on failure, either when a is a constant set or from
   running out of memory.

FcCharSetHasChar

Name

   FcCharSetHasChar -- Check a charset for a char

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcCharSetHasChar(const FcCharSet *fcs, FcChar32 ucs4);

Description

   Returns whether fcs contains the char ucs4.

FcCharSetCount

Name

   FcCharSetCount -- Count entries in a charset

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar32 FcCharSetCount(const FcCharSet *a);

Description

   Returns the total number of Unicode chars in a.

FcCharSetIntersectCount

Name

   FcCharSetIntersectCount -- Intersect and count charsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar32 FcCharSetIntersectCount(const FcCharSet *a, const
   FcCharSet *b);

Description

   Returns the number of chars that are in both a and b.

FcCharSetSubtractCount

Name

   FcCharSetSubtractCount -- Subtract and count charsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar32 FcCharSetSubtractCount(const FcCharSet *a, const
   FcCharSet *b);

Description

   Returns the number of chars that are in a but not in b.

FcCharSetIsSubset

Name

   FcCharSetIsSubset -- Test for charset inclusion

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcCharSetIsSubset(const FcCharSet *a, const FcCharSet
   *b);

Description

   Returns whether a is a subset of b.

FcCharSetFirstPage

Name

   FcCharSetFirstPage -- Start enumerating charset contents

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar32 FcCharSetFirstPage(const FcCharSet *a,
   FcChar32[FC_CHARSET_MAP_SIZE] map, FcChar32 *next);

Description

   Builds an array of bits in map marking the first page of
   Unicode coverage of a. *next is set to contains the base code
   point for the next page in a. Returns the base code point for
   the page, or FC_CHARSET_DONE if a contains no pages. As an
   example, if FcCharSetFirstPage returns 0x300 and fills map with
0xffffffff 0xffffffff 0x01000008 0x44300002 0xffffd7f0 0xfffffffb 0xffff
7fff 0xffff0003

   Then the page contains code points 0x300 through 0x33f (the
   first 64 code points on the page) because map[0] and map[1]
   both have all their bits set. It also contains code points
   0x343 (0x300 + 32*2 + (4-1)) and 0x35e (0x300 + 32*2 + (31-1))
   because map[2] has the 4th and 31st bits set. The code points
   represented by map[3] and later are left as an exercise for the
   reader ;).

FcCharSetNextPage

Name

   FcCharSetNextPage -- Continue enumerating charset contents

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar32 FcCharSetNextPage(const FcCharSet *a,
   FcChar32[FC_CHARSET_MAP_SIZE] map, FcChar32 *next);

Description

   Builds an array of bits in map marking the Unicode coverage of
   a for page containing *next (see the FcCharSetFirstPage
   description for details). *next is set to contains the base
   code point for the next page in a. Returns the base of code
   point for the page, or FC_CHARSET_DONE if a does not contain
   *next.

FcCharSetCoverage

Name

   FcCharSetCoverage -- DEPRECATED return coverage for a Unicode
   page

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar32 FcCharSetCoverage(const FcCharSet *a, FcChar32 page,
   FcChar32[8] result);

Description

   DEPRECATED This function returns a bitmask in result which
   indicates which code points in page are included in a.
   FcCharSetCoverage returns the next page in the charset which
   has any coverage.

FcCharSetNew

Name

   FcCharSetNew -- DEPRECATED alias for FcCharSetCreate

Synopsis

#include <fontconfig/fontconfig.h>

   FcCharSet * FcCharSetNew(void);

Description

   FcCharSetNew is a DEPRECATED alias for FcCharSetCreate.
     __________________________________________________________

4.9. FcLangSet

   Table of Contents
   FcLangSetCreate -- create a langset object
   FcLangSetDestroy -- destroy a langset object
   FcLangSetCopy -- copy a langset object
   FcLangSetAdd -- add a language to a langset
   FcLangSetDel -- delete a language from a langset
   FcLangSetUnion -- Add langsets
   FcLangSetSubtract -- Subtract langsets
   FcLangSetCompare -- compare language sets
   FcLangSetContains -- check langset subset relation
   FcLangSetEqual -- test for matching langsets
   FcLangSetHash -- return a hash value for a langset
   FcLangSetHasLang -- test langset for language support
   FcGetDefaultLangs -- Get the default languages list
   FcConfigGetDefaultLangs -- Get the default languages list
   FcLangSetGetLangs -- get the list of languages in the langset
   FcGetLangs -- Get list of languages
   FcLangNormalize -- Normalize the language string
   FcLangGetCharSet -- Get character map for a language

   An FcLangSet is a set of language names (each of which include
   language and an optional territory). They are used when
   selecting fonts to indicate which languages the fonts need to
   support. Each font is marked, using language orthography
   information built into fontconfig, with the set of supported
   languages.

FcLangSetCreate

Name

   FcLangSetCreate -- create a langset object

Synopsis

#include <fontconfig/fontconfig.h>

   FcLangSet * FcLangSetCreate(void);

Description

   FcLangSetCreate creates a new FcLangSet object.

FcLangSetDestroy

Name

   FcLangSetDestroy -- destroy a langset object

Synopsis

#include <fontconfig/fontconfig.h>

   void FcLangSetDestroy(FcLangSet *ls);

Description

   FcLangSetDestroy destroys a FcLangSet object, freeing all
   memory associated with it.

FcLangSetCopy

Name

   FcLangSetCopy -- copy a langset object

Synopsis

#include <fontconfig/fontconfig.h>

   FcLangSet * FcLangSetCopy(const FcLangSet *ls);

Description

   FcLangSetCopy creates a new FcLangSet object and populates it
   with the contents of ls.

FcLangSetAdd

Name

   FcLangSetAdd -- add a language to a langset

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcLangSetAdd(FcLangSet *ls, const FcChar8 *lang);

Description

   lang is added to ls. lang should be of the form Ll-Tt where Ll
   is a two or three letter language from ISO 639 and Tt is a
   territory from ISO 3166.

FcLangSetDel

Name

   FcLangSetDel -- delete a language from a langset

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcLangSetDel(FcLangSet *ls, const FcChar8 *lang);

Description

   lang is removed from ls. lang should be of the form Ll-Tt where
   Ll is a two or three letter language from ISO 639 and Tt is a
   territory from ISO 3166.

Since

   version 2.9.0

FcLangSetUnion

Name

   FcLangSetUnion -- Add langsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcLangSet * FcLangSetUnion(const FcLangSet *ls_a, const
   FcLangSet *ls_b);

Description

   Returns a set including only those languages found in either
   ls_a or ls_b.

Since

   version 2.9.0

FcLangSetSubtract

Name

   FcLangSetSubtract -- Subtract langsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcLangSet * FcLangSetSubtract(const FcLangSet *ls_a, const
   FcLangSet *ls_b);

Description

   Returns a set including only those languages found in ls_a but
   not in ls_b.

Since

   version 2.9.0

FcLangSetCompare

Name

   FcLangSetCompare -- compare language sets

Synopsis

#include <fontconfig/fontconfig.h>

   FcLangResult FcLangSetCompare(const FcLangSet *ls_a, const
   FcLangSet *ls_b);

Description

   FcLangSetCompare compares language coverage for ls_a and ls_b.
   If they share any language and territory pair, this function
   returns FcLangEqual. If they share a language but differ in
   which territory that language is for, this function returns
   FcLangDifferentTerritory. If they share no languages in common,
   this function returns FcLangDifferentLang.

FcLangSetContains

Name

   FcLangSetContains -- check langset subset relation

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcLangSetContains(const FcLangSet *ls_a, const FcLangSet
   *ls_b);

Description

   FcLangSetContains returns FcTrue if ls_a contains every
   language in ls_b. ls_a will 'contain' a language from ls_b if
   ls_a has exactly the language, or either the language or ls_a
   has no territory.

FcLangSetEqual

Name

   FcLangSetEqual -- test for matching langsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcLangSetEqual(const FcLangSet *ls_a, const FcLangSet
   *ls_b);

Description

   Returns FcTrue if and only if ls_a supports precisely the same
   language and territory combinations as ls_b.

FcLangSetHash

Name

   FcLangSetHash -- return a hash value for a langset

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar32 FcLangSetHash(const FcLangSet *ls);

Description

   This function returns a value which depends solely on the
   languages supported by ls. Any language which equals ls will
   have the same result from FcLangSetHash. However, two langsets
   with the same hash value may not be equal.

FcLangSetHasLang

Name

   FcLangSetHasLang -- test langset for language support

Synopsis

#include <fontconfig/fontconfig.h>

   FcLangResult FcLangSetHasLang(const FcLangSet *ls, const
   FcChar8 *lang);

Description

   FcLangSetHasLang checks whether ls supports lang. If ls has a
   matching language and territory pair, this function returns
   FcLangEqual. If ls has a matching language but differs in which
   territory that language is for, this function returns
   FcLangDifferentTerritory. If ls has no matching language, this
   function returns FcLangDifferentLang.

FcGetDefaultLangs

Name

   FcGetDefaultLangs -- Get the default languages list

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrSet * FcGetDefaultLangs(void);

Description

   Returns a string set of the default languages according to the
   environment variables on the system. This function looks for
   them in order of FC_LANG, LC_ALL, LC_CTYPE and LANG then. If
   there are no valid values in those environment variables, "en"
   will be set as fallback.

   This function has been replaced by FcConfigGetDefaultLangs and
   will be deprecated.

Since

   version 2.9.91

FcConfigGetDefaultLangs

Name

   FcConfigGetDefaultLangs -- Get the default languages list

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrSet * FcConfigGetDefaultLangs(FcConfig *config);

Description

   Returns a string set of the default languages according to the
   environment variables on the system. This function looks for
   them in order of FC_LANG, LC_ALL, LC_CTYPE and LANG then. If
   there are no valid values in those environment variables, "en"
   will be set as fallback.

Since

   version 2.17.0

FcLangSetGetLangs

Name

   FcLangSetGetLangs -- get the list of languages in the langset

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrSet * FcLangSetGetLangs(const FcLangSet *ls);

Description

   Returns a string set of all languages in langset.

FcGetLangs

Name

   FcGetLangs -- Get list of languages

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrSet * FcGetLangs(void);

Description

   Returns a string set of all known languages.

FcLangNormalize

Name

   FcLangNormalize -- Normalize the language string

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcLangNormalize(const FcChar8 *lang);

Description

   Returns a string to make lang suitable on fontconfig.

Since

   version 2.10.91

FcLangGetCharSet

Name

   FcLangGetCharSet -- Get character map for a language

Synopsis

#include <fontconfig/fontconfig.h>

   const FcCharSet * FcLangGetCharSet(const FcChar8 *lang);

Description

   Returns the FcCharMap for a language.
     __________________________________________________________

4.10. FcMatrix

   Table of Contents
   FcMatrixInit -- initialize an FcMatrix structure
   FcMatrixCopy -- Copy a matrix
   FcMatrixEqual -- Compare two matrices
   FcMatrixMultiply -- Multiply matrices
   FcMatrixRotate -- Rotate a matrix
   FcMatrixScale -- Scale a matrix
   FcMatrixShear -- Shear a matrix

   FcMatrix structures hold an affine transformation in matrix
   form.

FcMatrixInit

Name

   FcMatrixInit -- initialize an FcMatrix structure

Synopsis

#include <fontconfig/fontconfig.h>

   void FcMatrixInit(FcMatrix *matrix);

Description

   FcMatrixInit initializes matrix to the identity matrix.

FcMatrixCopy

Name

   FcMatrixCopy -- Copy a matrix

Synopsis

#include <fontconfig/fontconfig.h>

   void FcMatrixCopy(const FcMatrix *matrix);

Description

   FcMatrixCopy allocates a new FcMatrix and copies mat into it.

FcMatrixEqual

Name

   FcMatrixEqual -- Compare two matrices

Synopsis

#include <fontconfig/fontconfig.h>

   void FcMatrixEqual(const FcMatrix *matrix1, const FcMatrix
   *matrix2);

Description

   FcMatrixEqual compares matrix1 and matrix2 returning FcTrue
   when they are equal and FcFalse when they are not.

FcMatrixMultiply

Name

   FcMatrixMultiply -- Multiply matrices

Synopsis

#include <fontconfig/fontconfig.h>

   void FcMatrixMultiply(FcMatrix *result, const FcMatrix
   *matrix1, const FcMatrix *matrix2);

Description

   FcMatrixMultiply multiplies matrix1 and matrix2 storing the
   result in result.

FcMatrixRotate

Name

   FcMatrixRotate -- Rotate a matrix

Synopsis

#include <fontconfig/fontconfig.h>

   void FcMatrixRotate(FcMatrix *matrix, double cos, double sin);

Description

   FcMatrixRotate rotates matrix by the angle who's sine is sin
   and cosine is cos. This is done by multiplying by the matrix:
  cos -sin
  sin  cos

FcMatrixScale

Name

   FcMatrixScale -- Scale a matrix

Synopsis

#include <fontconfig/fontconfig.h>

   void FcMatrixScale(FcMatrix *matrix, double sx, double dy);

Description

   FcMatrixScale multiplies matrix x values by sx and y values by
   dy. This is done by multiplying by the matrix:
   sx  0
   0   dy

FcMatrixShear

Name

   FcMatrixShear -- Shear a matrix

Synopsis

#include <fontconfig/fontconfig.h>

   void FcMatrixShear(FcMatrix *matrix, double sh, double sv);

Description

   FcMatrixShare shears matrix horizontally by sh and vertically
   by sv. This is done by multiplying by the matrix:
  1  sh
  sv  1
     __________________________________________________________

4.11. FcRange

   Table of Contents
   FcRangeCopy -- Copy a range object
   FcRangeCreateDouble -- create a range object for double
   FcRangeCreateInteger -- create a range object for integer
   FcRangeDestroy -- destroy a range object
   FcRangeGetDouble -- Get the range in double

   An FcRange holds two variables to indicate a range in between.

FcRangeCopy

Name

   FcRangeCopy -- Copy a range object

Synopsis

#include <fontconfig/fontconfig.h>

   FcRange * FcRangeCopy(const FcRange *range);

Description

   FcRangeCopy creates a new FcRange object and populates it with
   the contents of range.

Since

   version 2.11.91

FcRangeCreateDouble

Name

   FcRangeCreateDouble -- create a range object for double

Synopsis

#include <fontconfig/fontconfig.h>

   FcRange * FcRangeCreateDouble(double begin, double end);

Description

   FcRangeCreateDouble creates a new FcRange object with double
   sized value.

Since

   version 2.11.91

FcRangeCreateInteger

Name

   FcRangeCreateInteger -- create a range object for integer

Synopsis

#include <fontconfig/fontconfig.h>

   FcRange * FcRangeCreateInteger(int begin, int end);

Description

   FcRangeCreateInteger creates a new FcRange object with integer
   sized value.

Since

   version 2.11.91

FcRangeDestroy

Name

   FcRangeDestroy -- destroy a range object

Synopsis

#include <fontconfig/fontconfig.h>

   void FcRangeDestroy(FcRange *range);

Description

   FcRangeDestroy destroys a FcRange object, freeing all memory
   associated with it.

Since

   version 2.11.91

FcRangeGetDouble

Name

   FcRangeGetDouble -- Get the range in double

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcRangeGetDouble(const FcRange *range, double *begin,
   double *end);

Description

   Returns in begin and end as the range.

Since

   version 2.11.91
     __________________________________________________________

4.12. FcConfig

   Table of Contents
   FcConfigCreate -- Create a configuration
   FcConfigReference -- Increment config reference count
   FcConfigDestroy -- Destroy a configuration
   FcConfigSetCurrent -- Set configuration as default
   FcConfigGetCurrent -- Return current configuration
   FcConfigSetFontSetFilter -- Set a predicate function to filter
          fontsets

   FcConfigAcceptFilter -- Test whether the given pattern matches
          filter

   FcConfigUptoDate -- Check timestamps on config files
   FcConfigHome -- return the current home directory.
   FcConfigEnableHome -- controls use of the home directory.
   FcConfigBuildFonts -- Build font database
   FcConfigGetConfigDirs -- Get config directories
   FcConfigGetFontDirs -- Get font directories
   FcConfigGetConfigFiles -- Get config files
   FcConfigGetCache -- DEPRECATED used to return per-user cache
          filename

   FcConfigGetCacheDirs -- return the list of directories searched
          for cache files

   FcConfigGetFonts -- Get config font set
   FcConfigGetBlanks -- Get config blanks
   FcConfigGetRescanInterval -- Get config rescan interval
   FcConfigSetRescanInterval -- Set config rescan interval
   FcConfigAppFontAddFile -- Add font file to font database
   FcConfigAppFontAddDir -- Add fonts from directory to font
          database

   FcConfigAppFontClear -- Remove all app fonts from font database
   FcConfigSubstituteWithPat -- Execute substitutions
   FcConfigSubstitute -- Execute substitutions
   FcFontMatch -- Return best font
   FcFontSort -- Return list of matching fonts
   FcFontRenderPrepare -- Prepare pattern for loading font file
   FcFontList -- List fonts
   FcConfigFilename -- Find a config file
   FcConfigGetFilename -- Find a config file
   FcConfigParseAndLoad -- load a configuration file
   FcConfigParseAndLoadFromMemory -- load a configuration from
          memory

   FcConfigGetSysRoot -- Obtain the system root directory
   FcConfigSetSysRoot -- Set the system root directory
   FcConfigFileInfoIterInit -- Initialize the iterator
   FcConfigFileInfoIterNext -- Set the iterator to point to the
          next list

   FcConfigFileInfoIterGet -- Obtain the configuration file
          information

   FcConfigAcceptFont -- Test whether the given pattern matches
          deny list

   FcConfigPreferAppFont --

   An FcConfig object holds the internal representation of a
   configuration. There is a default configuration which
   applications may use by passing 0 to any function using the
   data within an FcConfig.

FcConfigCreate

Name

   FcConfigCreate -- Create a configuration

Synopsis

#include <fontconfig/fontconfig.h>

   FcConfig * FcConfigCreate(void);

Description

   Creates an empty configuration.

FcConfigReference

Name

   FcConfigReference -- Increment config reference count

Synopsis

#include <fontconfig/fontconfig.h>

   FcConfig * FcConfigReference(FcConfig *config);

Description

   Add another reference to config. Configs are freed only when
   the reference count reaches zero. If config is NULL, the
   current configuration is used. In that case this function will
   be similar to FcConfigGetCurrent() except that it increments
   the reference count before returning and the user is
   responsible for destroying the configuration when not needed
   anymore.

FcConfigDestroy

Name

   FcConfigDestroy -- Destroy a configuration

Synopsis

#include <fontconfig/fontconfig.h>

   void FcConfigDestroy(FcConfig *config);

Description

   Decrements the config reference count. If all references are
   gone, destroys the configuration and any data associated with
   it. Note that calling this function with the return from
   FcConfigGetCurrent will cause a new configuration to be created
   for use as current configuration.

FcConfigSetCurrent

Name

   FcConfigSetCurrent -- Set configuration as default

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigSetCurrent(FcConfig *config);

Description

   Sets the current default configuration to config. Implicitly
   calls FcConfigBuildFonts if necessary, and FcConfigReference()
   to inrease the reference count in config since 2.12.0,
   returning FcFalse if that call fails.

FcConfigGetCurrent

Name

   FcConfigGetCurrent -- Return current configuration

Synopsis

#include <fontconfig/fontconfig.h>

   FcConfig * FcConfigGetCurrent(void);

Description

   Returns the current default configuration.

FcConfigSetFontSetFilter

Name

   FcConfigSetFontSetFilter -- Set a predicate function to filter
   fontsets

Synopsis

#include <fontconfig/fontconfig.h>

   FcConfig * FcConfigSetFontSetFilter(FcConfig *config,
   FcFilterFontSetFunc filter_func, FcDestroyFunc
   destroy_data_func, void *user_data);

Description

   Sets filter_func as a predicate function and filter out
   fontsets in config as desired. filter_func will be called with
   a font pattern and user_data only when loading caches. When
   config is going to be destroyed, user_data will be destroyed
   through destroy_data_func if it is set.

Since

   version 2.16.0

FcConfigAcceptFilter

Name

   FcConfigAcceptFilter -- Test whether the given pattern matches
   filter

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigAcceptFilter(FcConfig *config, const FcPattern
   *font);

Description

   This triggers a predicate function set by
   FcConfigSetFontSetFilter and return FcTrue if font matches
   something they expect. otherwise FcFalse.

Since

   version 2.16.0

FcConfigUptoDate

Name

   FcConfigUptoDate -- Check timestamps on config files

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigUptoDate(FcConfig *config);

Description

   Checks all of the files related to config and returns whether
   any of them has been modified since the configuration was
   created. If config is NULL, the current configuration is used.

FcConfigHome

Name

   FcConfigHome -- return the current home directory.

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcConfigHome(void);

Description

   Return the current user's home directory, if it is available,
   and if using it is enabled, and NULL otherwise. See also
   FcConfigEnableHome).

FcConfigEnableHome

Name

   FcConfigEnableHome -- controls use of the home directory.

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigEnableHome(FcBool enable);

Description

   If enable is FcTrue, then Fontconfig will use various files
   which are specified relative to the user's home directory
   (using the ~ notation in the configuration). When enable is
   FcFalse, then all use of the home directory in these contexts
   will be disabled. The previous setting of the value is
   returned.

FcConfigBuildFonts

Name

   FcConfigBuildFonts -- Build font database

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigBuildFonts(FcConfig *config);

Description

   Builds the set of available fonts for the given configuration.
   Note that any changes to the configuration after this call
   (through FcConfigParseAndLoad or
   FcConfigParseAndLoadFromMemory) have indeterminate effects. (On
   the other hand, application fonts can still be modified through
   FcConfigAppFontAddFile, FcConfigAppFontAddDir and
   FcConfigAppFontClear). Returns FcFalse if this operation runs
   out of memory. If config is NULL, the current configuration is
   used.

FcConfigGetConfigDirs

Name

   FcConfigGetConfigDirs -- Get config directories

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrList * FcConfigGetConfigDirs(FcConfig *config);

Description

   Returns the list of font directories specified in the
   configuration files for config. Does not include any
   subdirectories. If config is NULL, the current configuration is
   used.

FcConfigGetFontDirs

Name

   FcConfigGetFontDirs -- Get font directories

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrList * FcConfigGetFontDirs(FcConfig *config);

Description

   Returns the list of font directories in config. This includes
   the configured font directories along with any directories
   below those in the filesystem. If config is NULL, the current
   configuration is used.

FcConfigGetConfigFiles

Name

   FcConfigGetConfigFiles -- Get config files

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrList * FcConfigGetConfigFiles(FcConfig *config);

Description

   Returns the list of known configuration files used to generate
   config. If config is NULL, the current configuration is used.

FcConfigGetCache

Name

   FcConfigGetCache -- DEPRECATED used to return per-user cache
   filename

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcConfigGetCache(FcConfig *config);

Description

   With fontconfig no longer using per-user cache files, this
   function now simply returns NULL to indicate that no per-user
   file exists.

FcConfigGetCacheDirs

Name

   FcConfigGetCacheDirs -- return the list of directories searched
   for cache files

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrList * FcConfigGetCacheDirs(const FcConfig *config);

Description

   FcConfigGetCacheDirs returns a string list containing all of
   the directories that fontconfig will search when attempting to
   load a cache file for a font directory. If config is NULL, the
   current configuration is used.

FcConfigGetFonts

Name

   FcConfigGetFonts -- Get config font set

Synopsis

#include <fontconfig/fontconfig.h>

   FcFontSet * FcConfigGetFonts(FcConfig *config, FcSetName set);

Description

   Returns one of the two sets of fonts from the configuration as
   specified by set. This font set is owned by the library and
   must not be modified or freed. If config is NULL, the current
   configuration is used.

   This function isn't MT-safe. FcConfigReference must be called
   before using this and then FcConfigDestroy when the return
   value is no longer referenced.

FcConfigGetBlanks

Name

   FcConfigGetBlanks -- Get config blanks

Synopsis

#include <fontconfig/fontconfig.h>

   FcBlanks * FcConfigGetBlanks(FcConfig *config);

Description

   FcBlanks is deprecated. This function always returns NULL.

FcConfigGetRescanInterval

Name

   FcConfigGetRescanInterval -- Get config rescan interval

Synopsis

#include <fontconfig/fontconfig.h>

   int FcConfigGetRescanInterval(FcConfig *config);

Description

   Returns the interval between automatic checks of the
   configuration (in seconds) specified in config. The
   configuration is checked during a call to FcFontList when this
   interval has passed since the last check. An interval setting
   of zero disables automatic checks. If config is NULL, the
   current configuration is used.

FcConfigSetRescanInterval

Name

   FcConfigSetRescanInterval -- Set config rescan interval

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigSetRescanInterval(FcConfig *config, int
   rescanInterval);

Description

   Sets the rescan interval. Returns FcFalse if the interval
   cannot be set (due to allocation failure). Otherwise returns
   FcTrue. An interval setting of zero disables automatic checks.
   If config is NULL, the current configuration is used.

FcConfigAppFontAddFile

Name

   FcConfigAppFontAddFile -- Add font file to font database

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigAppFontAddFile(FcConfig *config, const FcChar8
   *file);

Description

   Adds an application-specific font to the configuration. Returns
   FcFalse if the fonts cannot be added (due to allocation failure
   or no fonts found). Otherwise returns FcTrue. If config is
   NULL, the current configuration is used.

FcConfigAppFontAddDir

Name

   FcConfigAppFontAddDir -- Add fonts from directory to font
   database

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigAppFontAddDir(FcConfig *config, const FcChar8
   *dir);

Description

   Scans the specified directory for fonts, adding each one found
   to the application-specific set of fonts. Returns FcFalse if
   the fonts cannot be added (due to allocation failure).
   Otherwise returns FcTrue. If config is NULL, the current
   configuration is used.

FcConfigAppFontClear

Name

   FcConfigAppFontClear -- Remove all app fonts from font database

Synopsis

#include <fontconfig/fontconfig.h>

   void FcConfigAppFontClear(FcConfig *config);

Description

   Clears the set of application-specific fonts. If config is
   NULL, the current configuration is used.

FcConfigSubstituteWithPat

Name

   FcConfigSubstituteWithPat -- Execute substitutions

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigSubstituteWithPat(FcConfig *config, FcPattern
   *p, FcPattern *p_pat, FcMatchKind kind);

Description

   Performs the sequence of pattern modification operations, if
   kind is FcMatchPattern, then those tagged as pattern operations
   are applied, else if kind is FcMatchFont, those tagged as font
   operations are applied and p_pat is used for <test> elements
   with target=pattern. Returns FcFalse if the substitution cannot
   be performed (due to allocation failure). Otherwise returns
   FcTrue. If config is NULL, the current configuration is used.

FcConfigSubstitute

Name

   FcConfigSubstitute -- Execute substitutions

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigSubstitute(FcConfig *config, FcPattern *p,
   FcMatchKind kind);

Description

   Calls FcConfigSubstituteWithPat setting p_pat to NULL. Returns
   FcFalse if the substitution cannot be performed (due to
   allocation failure). Otherwise returns FcTrue. If config is
   NULL, the current configuration is used.

FcFontMatch

Name

   FcFontMatch -- Return best font

Synopsis

#include <fontconfig/fontconfig.h>

   FcPattern * FcFontMatch(FcConfig *config, FcPattern *p,
   FcResult *result);

Description

   Finds the font in sets most closely matching pattern and
   returns the result of FcFontRenderPrepare for that font and the
   provided pattern. This function should be called only after
   FcConfigSubstitute and FcDefaultSubstitute have been called for
   p; otherwise the results will not be correct. If config is
   NULL, the current configuration is used.

FcFontSort

Name

   FcFontSort -- Return list of matching fonts

Synopsis

#include <fontconfig/fontconfig.h>

   FcFontSet * FcFontSort(FcConfig *config, FcPattern *p, FcBool
   trim, FcCharSet **csp, FcResult *result);

Description

   Returns the list of fonts sorted by closeness to p. If trim is
   FcTrue, elements in the list which don't include Unicode
   coverage not provided by earlier elements in the list are
   elided. The union of Unicode coverage of all of the fonts is
   returned in csp, if csp is not NULL. This function should be
   called only after FcConfigSubstitute and FcDefaultSubstitute
   have been called for p; otherwise the results will not be
   correct.

   The returned FcFontSet references FcPattern structures which
   may be shared by the return value from multiple FcFontSort
   calls, applications must not modify these patterns. Instead,
   they should be passed, along with p to FcFontRenderPrepare
   which combines them into a complete pattern.

   The FcFontSet returned by FcFontSort is destroyed by calling
   FcFontSetDestroy. If config is NULL, the current configuration
   is used.

FcFontRenderPrepare

Name

   FcFontRenderPrepare -- Prepare pattern for loading font file

Synopsis

#include <fontconfig/fontconfig.h>

   FcPattern * FcFontRenderPrepare(FcConfig *config, FcPattern
   *pat, FcPattern *font);

Description

   Creates a new pattern consisting of elements of font not
   appearing in pat, elements of pat not appearing in font and the
   best matching value from pat for elements appearing in both.
   The result is passed to FcConfigSubstituteWithPat with kind
   FcMatchFont and then returned.

FcFontList

Name

   FcFontList -- List fonts

Synopsis

#include <fontconfig/fontconfig.h>

   FcFontSet * FcFontList(FcConfig *config, FcPattern *p,
   FcObjectSet *os);

Description

   Selects fonts matching p, creates patterns from those fonts
   containing only the objects in os and returns the set of unique
   such patterns. If config is NULL, the default configuration is
   checked to be up to date, and used.

FcConfigFilename

Name

   FcConfigFilename -- Find a config file

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcConfigFilename(const FcChar8 *name);

Description

   This function is deprecated and is replaced by
   FcConfigGetFilename.

FcConfigGetFilename

Name

   FcConfigGetFilename -- Find a config file

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcConfigGetFilename(FcConfig *config, const FcChar8
   *name);

Description

   Given the specified external entity name, return the associated
   filename. This provides applications a way to convert various
   configuration file references into filename form.

   A null or empty name indicates that the default configuration
   file should be used; which file this references can be
   overridden with the FONTCONFIG_FILE environment variable. Next,
   if the name starts with ~, it refers to a file in the current
   users home directory. Otherwise if the name doesn't start with
   '/', it refers to a file in the default configuration
   directory; the built-in default directory can be overridden
   with the FONTCONFIG_PATH environment variable.

   The result of this function is affected by the
   FONTCONFIG_SYSROOT environment variable or equivalent
   functionality.

FcConfigParseAndLoad

Name

   FcConfigParseAndLoad -- load a configuration file

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigParseAndLoad(FcConfig *config, const FcChar8
   *file, FcBool complain);

Description

   Walks the configuration in 'file' and constructs the internal
   representation in 'config'. Any include files referenced from
   within 'file' will be loaded and parsed. If 'complain' is
   FcFalse, no warning will be displayed if 'file' does not exist.
   Error and warning messages will be output to stderr. Returns
   FcFalse if some error occurred while loading the file, either a
   parse error, semantic error or allocation failure. Otherwise
   returns FcTrue. After all configuration files / strings have
   been loaded, with FcConfigParseAndLoad and/or
   FcConfigParseAndLoadFromMemory, call FcConfigBuildFonts to
   build the font database.

FcConfigParseAndLoadFromMemory

Name

   FcConfigParseAndLoadFromMemory -- load a configuration from
   memory

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigParseAndLoadFromMemory(FcConfig *config, const
   FcChar8 *buffer, FcBool complain);

Description

   Walks the configuration in 'memory' and constructs the internal
   representation in 'config'. Any includes files referenced from
   within 'memory' will be loaded and dparsed. If 'complain' is
   FcFalse, no warning will be displayed if 'file' does not exist.
   Error and warning messages will be output to stderr. Returns
   FcFalse if fsome error occurred while loading the file, either
   a parse error, semantic error or allocation failure. Otherwise
   returns FcTrue. After all configuration files / strings have
   been loaded, with FcConfigParseAndLoad and/or
   FcConfigParseAndLoadFromMemory, call FcConfigBuildFonts to
   build the font database.

Since

   version 2.12.5

FcConfigGetSysRoot

Name

   FcConfigGetSysRoot -- Obtain the system root directory

Synopsis

#include <fontconfig/fontconfig.h>

   const FcChar8 * FcConfigGetSysRoot(const FcConfig *config);

Description

   Obtains the system root directory in 'config' if available. All
   files (including file properties in patterns) obtained from
   this 'config' are relative to this system root directory.

   This function isn't MT-safe. FcConfigReference must be called
   before using this and then FcConfigDestroy when the return
   value is no longer referenced.

Since

   version 2.10.92

FcConfigSetSysRoot

Name

   FcConfigSetSysRoot -- Set the system root directory

Synopsis

#include <fontconfig/fontconfig.h>

   void FcConfigSetSysRoot(FcConfig *config, const FcChar8
   *sysroot);

Description

   Set 'sysroot' as the system root directory. All file paths used
   or created with this 'config' (including file properties in
   patterns) will be considered or made relative to this
   'sysroot'. This allows a host to generate caches for targets at
   build time. This also allows a cache to be re-targeted to a
   different base directory if 'FcConfigGetSysRoot' is used to
   resolve file paths. When setting this on the current config
   this causes changing current config (calls
   FcConfigSetCurrent()).

Since

   version 2.10.92

FcConfigFileInfoIterInit

Name

   FcConfigFileInfoIterInit -- Initialize the iterator

Synopsis

#include <fontconfig/fontconfig.h>

   void FcConfigFileInfoIterInit(FcConfig *config,
   FcConfigFileInfoIter *iter);

Description

   Initialize 'iter' with the first iterator in the config file
   information list.

   The config file information list is stored in numerical order
   for filenames i.e. how fontconfig actually read them.

   This function isn't MT-safe. FcConfigReference must be called
   before using this and then FcConfigDestroy when the relevant
   values are no longer referenced.

Since

   version 2.12.91

FcConfigFileInfoIterNext

Name

   FcConfigFileInfoIterNext -- Set the iterator to point to the
   next list

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigFileInfoIterNext(FcConfig *config,
   FcConfigFileInfoIter *iter);

Description

   Set 'iter' to point to the next node in the config file
   information list. If there is no next node, FcFalse is
   returned.

   This function isn't MT-safe. FcConfigReference must be called
   before using FcConfigFileInfoIterInit and then FcConfigDestroy
   when the relevant values are no longer referenced.

Since

   version 2.12.91

FcConfigFileInfoIterGet

Name

   FcConfigFileInfoIterGet -- Obtain the configuration file
   information

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigFileInfoIterGet(FcConfig *config,
   FcConfigFileInfoIter *iter, FcChar8 **name, FcChar8
   **description, FcBool *enabled);

Description

   Obtain the filename, the description and the flag whether it is
   enabled or not for 'iter' where points to current configuration
   file information. If the iterator is invalid, FcFalse is
   returned.

   This function isn't MT-safe. FcConfigReference must be called
   before using FcConfigFileInfoIterInit and then FcConfigDestroy
   when the relevant values are no longer referenced.

Since

   version 2.12.91

FcConfigAcceptFont

Name

   FcConfigAcceptFont -- Test whether the given pattern matches
   deny list

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcConfigAcceptFont(FcConfig *config, FcPattern *pat);

Description

   fontconfig has the deny list which is built against
   <rejectfont> directive in configuration file. This function
   tries to match 'pat' with them and return FcFalse if 'pat' is
   rejected, otherwise FcTrue.

Since

   version 2.15.1

FcConfigPreferAppFont

Name

   FcConfigPreferAppFont --

Synopsis

#include <fontconfig/fontconfig.h>

   void FcConfigPreferAppFont(FcConfig *config, FcBool flag);

Description

   Set 'flag' to change the priority of Application fonts. default
   behavior is turned off for backward compatibility.

Since

   version 2.17.0
     __________________________________________________________

4.13. FcObjectType

   Table of Contents
   FcNameRegisterObjectTypes -- Register object types
   FcNameUnregisterObjectTypes -- Unregister object types
   FcNameGetObjectType -- Lookup an object type

   Provides for application-specified font name object types so
   that new pattern elements can be generated from font names.

FcNameRegisterObjectTypes

Name

   FcNameRegisterObjectTypes -- Register object types

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcNameRegisterObjectTypes(const FcObjectType *types, int
   ntype);

Description

   Deprecated. Does nothing. Returns FcFalse.

FcNameUnregisterObjectTypes

Name

   FcNameUnregisterObjectTypes -- Unregister object types

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcNameUnregisterObjectTypes(const FcObjectType *types,
   int ntype);

Description

   Deprecated. Does nothing. Returns FcFalse.

FcNameGetObjectType

Name

   FcNameGetObjectType -- Lookup an object type

Synopsis

#include <fontconfig/fontconfig.h>

   const FcObjectType * FcNameGetObjectType(const char *object);

Description

   Return the object type for the pattern element named object.
     __________________________________________________________

4.14. FcConstant

   Table of Contents
   FcNameRegisterConstants -- Register symbolic constants
   FcNameUnregisterConstants -- Unregister symbolic constants
   FcNameGetConstant -- Lookup symbolic constant
   FcNameGetConstantFor -- Lookup symbolic constant For object
   FcNameConstant -- Get the value for a symbolic constant

   Provides for application-specified symbolic constants for font
   names.

FcNameRegisterConstants

Name

   FcNameRegisterConstants -- Register symbolic constants

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcNameRegisterConstants(const FcConstant *consts, int
   nconsts);

Description

   Deprecated. Does nothing. Returns FcFalse.

FcNameUnregisterConstants

Name

   FcNameUnregisterConstants -- Unregister symbolic constants

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcNameUnregisterConstants(const FcConstant *consts, int
   nconsts);

Description

   Deprecated. Does nothing. Returns FcFalse.

FcNameGetConstant

Name

   FcNameGetConstant -- Lookup symbolic constant

Synopsis

#include <fontconfig/fontconfig.h>

   const FcConstant * FcNameGetConstant(FcChar8 *string);

Description

   Return the FcConstant structure related to symbolic constant
   string.

FcNameGetConstantFor

Name

   FcNameGetConstantFor -- Lookup symbolic constant For object

Synopsis

#include <fontconfig/fontconfig.h>

   const FcConstant * FcNameGetConstantFor(FcChar8 *string, char
   *object);

Description

   Return the FcConstant structure related to symbolic constant
   string for object.

FcNameConstant

Name

   FcNameConstant -- Get the value for a symbolic constant

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcNameConstant(FcChar8 *string, int *result);

Description

   Returns whether a symbolic constant with name string is
   registered, placing the value of the constant in result if
   present.
     __________________________________________________________

4.15. FcWeight

   Table of Contents
   FcWeightFromOpenTypeDouble -- Convert from OpenType weight
          values to fontconfig ones

   FcWeightToOpenTypeDouble -- Convert from fontconfig weight
          values to OpenType ones

   FcWeightFromOpenType -- Convert from OpenType weight values to
          fontconfig ones

   FcWeightToOpenType -- Convert from fontconfig weight values to
          OpenType ones

   Maps weights to and from OpenType weights.

FcWeightFromOpenTypeDouble

Name

   FcWeightFromOpenTypeDouble -- Convert from OpenType weight
   values to fontconfig ones

Synopsis

#include <fontconfig/fontconfig.h>

   double FcWeightFromOpenTypeDouble(double ot_weight);

Description

   FcWeightFromOpenTypeDouble returns an double value to use with
   FC_WEIGHT, from an double in the 1..1000 range, resembling the
   numbers from OpenType specification's OS/2 usWeight numbers,
   which are also similar to CSS font-weight numbers. If input is
   negative, zero, or greater than 1000, returns -1. This function
   linearly interpolates between various FC_WEIGHT_* constants. As
   such, the returned value does not necessarily match any of the
   predefined constants.

Since

   version 2.12.92

FcWeightToOpenTypeDouble

Name

   FcWeightToOpenTypeDouble -- Convert from fontconfig weight
   values to OpenType ones

Synopsis

#include <fontconfig/fontconfig.h>

   double FcWeightToOpenTypeDouble(double ot_weight);

Description

   FcWeightToOpenTypeDouble is the inverse of
   FcWeightFromOpenType. If the input is less than FC_WEIGHT_THIN
   or greater than FC_WEIGHT_EXTRABLACK, returns -1. Otherwise
   returns a number in the range 1 to 1000.

Since

   version 2.12.92

FcWeightFromOpenType

Name

   FcWeightFromOpenType -- Convert from OpenType weight values to
   fontconfig ones

Synopsis

#include <fontconfig/fontconfig.h>

   int FcWeightFromOpenType(int ot_weight);

Description

   FcWeightFromOpenType is like FcWeightFromOpenTypeDouble but
   with integer arguments. Use the other function instead.

Since

   version 2.11.91

FcWeightToOpenType

Name

   FcWeightToOpenType -- Convert from fontconfig weight values to
   OpenType ones

Synopsis

#include <fontconfig/fontconfig.h>

   int FcWeightToOpenType(int ot_weight);

Description

   FcWeightToOpenType is like FcWeightToOpenTypeDouble but with
   integer arguments. Use the other function instead.

Since

   version 2.11.91
     __________________________________________________________

4.16. FcBlanks

   Table of Contents
   FcBlanksCreate -- Create an FcBlanks
   FcBlanksDestroy -- Destroy and FcBlanks
   FcBlanksAdd -- Add a character to an FcBlanks
   FcBlanksIsMember -- Query membership in an FcBlanks

   An FcBlanks object holds a list of Unicode chars which are
   expected to be blank when drawn. When scanning new fonts, any
   glyphs which are empty and not in this list will be assumed to
   be broken and not placed in the FcCharSet associated with the
   font. This provides a significantly more accurate CharSet for
   applications.

   FcBlanks is deprecated and should not be used in newly written
   code. It is still accepted by some functions for compatibility
   with older code but will be removed in the future.

FcBlanksCreate

Name

   FcBlanksCreate -- Create an FcBlanks

Synopsis

#include <fontconfig/fontconfig.h>

   FcBlanks * FcBlanksCreate(void);

Description

   FcBlanks is deprecated. This function always returns NULL.

FcBlanksDestroy

Name

   FcBlanksDestroy -- Destroy and FcBlanks

Synopsis

#include <fontconfig/fontconfig.h>

   void FcBlanksDestroy(FcBlanks *b);

Description

   FcBlanks is deprecated. This function does nothing.

FcBlanksAdd

Name

   FcBlanksAdd -- Add a character to an FcBlanks

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcBlanksAdd(FcBlanks *b, FcChar32 ucs4);

Description

   FcBlanks is deprecated. This function always returns FALSE.

FcBlanksIsMember

Name

   FcBlanksIsMember -- Query membership in an FcBlanks

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcBlanksIsMember(FcBlanks *b, FcChar32 ucs4);

Description

   FcBlanks is deprecated. This function always returns FALSE.
     __________________________________________________________

4.17. FcAtomic

   Table of Contents
   FcAtomicCreate -- create an FcAtomic object
   FcAtomicLock -- lock a file
   FcAtomicNewFile -- return new temporary file name
   FcAtomicOrigFile -- return original file name
   FcAtomicReplaceOrig -- replace original with new
   FcAtomicDeleteNew -- delete new file
   FcAtomicUnlock -- unlock a file
   FcAtomicDestroy -- destroy an FcAtomic object

   These functions provide a safe way to update configuration
   files, allowing ongoing reading of the old configuration file
   while locked for writing and ensuring that a consistent and
   complete version of the configuration file is always available.

FcAtomicCreate

Name

   FcAtomicCreate -- create an FcAtomic object

Synopsis

#include <fontconfig/fontconfig.h>

   FcAtomic * FcAtomicCreate(const FcChar8 *file);

Description

   Creates a data structure containing data needed to control
   access to file. Writing is done to a separate file. Once that
   file is complete, the original configuration file is atomically
   replaced so that reading process always see a consistent and
   complete file without the need to lock for reading.

FcAtomicLock

Name

   FcAtomicLock -- lock a file

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcAtomicLock(FcAtomic *atomic);

Description

   Attempts to lock the file referenced by atomic. Returns FcFalse
   if the file is already locked, else returns FcTrue and leaves
   the file locked.

FcAtomicNewFile

Name

   FcAtomicNewFile -- return new temporary file name

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcAtomicNewFile(FcAtomic *atomic);

Description

   Returns the filename for writing a new version of the file
   referenced by atomic.

FcAtomicOrigFile

Name

   FcAtomicOrigFile -- return original file name

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcAtomicOrigFile(FcAtomic *atomic);

Description

   Returns the file referenced by atomic.

FcAtomicReplaceOrig

Name

   FcAtomicReplaceOrig -- replace original with new

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcAtomicReplaceOrig(FcAtomic *atomic);

Description

   Replaces the original file referenced by atomic with the new
   file. Returns FcFalse if the file cannot be replaced due to
   permission issues in the filesystem. Otherwise returns FcTrue.

FcAtomicDeleteNew

Name

   FcAtomicDeleteNew -- delete new file

Synopsis

#include <fontconfig/fontconfig.h>

   void FcAtomicDeleteNew(FcAtomic *atomic);

Description

   Deletes the new file. Used in error recovery to back out
   changes.

FcAtomicUnlock

Name

   FcAtomicUnlock -- unlock a file

Synopsis

#include <fontconfig/fontconfig.h>

   void FcAtomicUnlock(FcAtomic *atomic);

Description

   Unlocks the file.

FcAtomicDestroy

Name

   FcAtomicDestroy -- destroy an FcAtomic object

Synopsis

#include <fontconfig/fontconfig.h>

   void FcAtomicDestroy(FcAtomic *atomic);

Description

   Destroys atomic.
     __________________________________________________________

4.18. File and Directory routines

   Table of Contents
   FcFileScan -- scan a font file
   FcFileIsDir -- check whether a file is a directory
   FcDirScan -- scan a font directory without caching it
   FcDirSave -- DEPRECATED: formerly used to save a directory
          cache

   FcDirCacheUnlink -- Remove all caches related to dir
   FcDirCacheValid -- check directory cache
   FcDirCacheLoad -- load a directory cache
   FcDirCacheRescan -- Re-scan a directory cache
   FcDirCacheRead -- read or construct a directory cache
   FcDirCacheLoadFile -- load a cache file
   FcDirCacheUnload -- unload a cache file

   These routines work with font files and directories, including
   font directory cache files.

FcFileScan

Name

   FcFileScan -- scan a font file

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcFileScan(FcFontSet *set, FcStrSet *dirs, FcFileCache
   *cache, FcBlanks *blanks, const FcChar8 *file, FcBool force);

Description

   Scans a single file and adds all fonts found to set. If force
   is FcTrue, then the file is scanned even if associated
   information is found in cache. If file is a directory, it is
   added to dirs. Whether fonts are found depends on fontconfig
   policy as well as the current configuration. Internally,
   fontconfig will ignore BDF and PCF fonts which are not in
   Unicode (or the effectively equivalent ISO Latin-1) encoding as
   those are not usable by Unicode-based applications. The
   configuration can ignore fonts based on filename or contents of
   the font file itself. Returns FcFalse if any of the fonts
   cannot be added (due to allocation failure). Otherwise returns
   FcTrue.

FcFileIsDir

Name

   FcFileIsDir -- check whether a file is a directory

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcFileIsDir(const FcChar8 *file);

Description

   Returns FcTrue if file is a directory, otherwise returns
   FcFalse.

FcDirScan

Name

   FcDirScan -- scan a font directory without caching it

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcDirScan(FcFontSet *set, FcStrSet *dirs, FcFileCache
   *cache, FcBlanks *blanks, const FcChar8 *dir, FcBool force);

Description

   If cache is not zero or if force is FcFalse, this function
   currently returns FcFalse. Otherwise, it scans an entire
   directory and adds all fonts found to set. Any subdirectories
   found are added to dirs. Calling this function does not create
   any cache files. Use FcDirCacheRead() if caching is desired.

FcDirSave

Name

   FcDirSave -- DEPRECATED: formerly used to save a directory
   cache

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcDirSave(FcFontSet *set, FcStrSet *dirs, const FcChar8
   *dir);

Description

   This function now does nothing aside from returning FcFalse. It
   used to creates the per-directory cache file for dir and
   populates it with the fonts in set and subdirectories in dirs.
   All of this functionality is now automatically managed by
   FcDirCacheLoad and FcDirCacheRead.

FcDirCacheUnlink

Name

   FcDirCacheUnlink -- Remove all caches related to dir

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcDirCacheUnlink(const FcChar8 *dir, FcConfig *config);

Description

   Scans the cache directories in config, removing any instances
   of the cache file for dir. Returns FcFalse when some internal
   error occurs (out of memory, etc). Errors actually unlinking
   any files are ignored.

FcDirCacheValid

Name

   FcDirCacheValid -- check directory cache

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcDirCacheValid(const FcChar8 *dir);

Description

   Returns FcTrue if dir has an associated valid cache file, else
   returns FcFalse

FcDirCacheLoad

Name

   FcDirCacheLoad -- load a directory cache

Synopsis

#include <fontconfig/fontconfig.h>

   FcCache * FcDirCacheLoad(const FcChar8 *dir, FcConfig *config,
   FcChar8 **cache_file);

Description

   Loads the cache related to dir. If no cache file exists,
   returns NULL. The name of the cache file is returned in
   cache_file, unless that is NULL. See also FcDirCacheRead.

FcDirCacheRescan

Name

   FcDirCacheRescan -- Re-scan a directory cache

Synopsis

#include <fontconfig/fontconfig.h>

   FcCache * FcDirCacheRescan(const FcChar8 *dir, FcConfig
   *config);

Description

   Re-scan directories only at dir and update the cache. returns
   NULL if failed.

Since

   version 2.11.1

FcDirCacheRead

Name

   FcDirCacheRead -- read or construct a directory cache

Synopsis

#include <fontconfig/fontconfig.h>

   FcCache * FcDirCacheRead(const FcChar8 *dir, FcBool force,
   FcConfig *config);

Description

   This returns a cache for dir. If force is FcFalse, then an
   existing, valid cache file will be used. Otherwise, a new cache
   will be created by scanning the directory and that returned.

FcDirCacheLoadFile

Name

   FcDirCacheLoadFile -- load a cache file

Synopsis

#include <fontconfig/fontconfig.h>

   FcCache * FcDirCacheLoadFile(const FcChar8 *cache_file, struct
   stat *file_stat);

Description

   This function loads a directory cache from cache_file. If
   file_stat is non-NULL, it will be filled with the results of
   stat(2) on the cache file.

FcDirCacheUnload

Name

   FcDirCacheUnload -- unload a cache file

Synopsis

#include <fontconfig/fontconfig.h>

   void FcDirCacheUnload(FcCache *cache);

Description

   This function dereferences cache. When no other references to
   it remain, all memory associated with the cache will be freed.
     __________________________________________________________

4.19. FcCache routines

   Table of Contents
   FcCacheDir -- Return directory of cache
   FcCacheCopySet -- Returns a copy of the fontset from cache
   FcCacheSubdir -- Return the i'th subdirectory.
   FcCacheNumSubdir -- Return the number of subdirectories in
          cache.

   FcCacheNumFont -- Returns the number of fonts in cache.
   FcDirCacheClean -- Clean up a cache directory
   FcCacheCreateTagFile -- Create CACHEDIR.TAG at cache directory.
   FcDirCacheCreateUUID -- Create .uuid file at a directory
   FcDirCacheDeleteUUID -- Delete .uuid file

   These routines work with font directory caches, accessing their
   contents in limited ways. It is not expected that normal
   applications will need to use these functions.

FcCacheDir

Name

   FcCacheDir -- Return directory of cache

Synopsis

#include <fontconfig/fontconfig.h>

   const FcChar8 * FcCacheDir(const FcCache *cache);

Description

   This function returns the directory from which the cache was
   constructed.

FcCacheCopySet

Name

   FcCacheCopySet -- Returns a copy of the fontset from cache

Synopsis

#include <fontconfig/fontconfig.h>

   FcFontSet * FcCacheCopySet(const FcCache *cache);

Description

   The returned fontset contains each of the font patterns from
   cache. This fontset may be modified, but the patterns from the
   cache are read-only.

FcCacheSubdir

Name

   FcCacheSubdir -- Return the i'th subdirectory.

Synopsis

#include <fontconfig/fontconfig.h>

   const FcChar8 * FcCacheSubdir(const FcCache *cache, int i);

Description

   The set of subdirectories stored in a cache file are indexed by
   this function, i should range from 0 to n-1, where n is the
   return value from FcCacheNumSubdir.

FcCacheNumSubdir

Name

   FcCacheNumSubdir -- Return the number of subdirectories in
   cache.

Synopsis

#include <fontconfig/fontconfig.h>

   int FcCacheNumSubdir(const FcCache *cache);

Description

   This returns the total number of subdirectories in the cache.

FcCacheNumFont

Name

   FcCacheNumFont -- Returns the number of fonts in cache.

Synopsis

#include <fontconfig/fontconfig.h>

   int FcCacheNumFont(const FcCache *cache);

Description

   This returns the number of fonts which would be included in the
   return from FcCacheCopySet.

FcDirCacheClean

Name

   FcDirCacheClean -- Clean up a cache directory

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcDirCacheClean(const FcChar8 *cache_dir, FcBool
   verbose);

Description

   This tries to clean up the cache directory of cache_dir. This
   returns FcTrue if the operation is successfully complete.
   otherwise FcFalse.

Since

   version 2.9.91

FcCacheCreateTagFile

Name

   FcCacheCreateTagFile -- Create CACHEDIR.TAG at cache directory.

Synopsis

#include <fontconfig/fontconfig.h>

   void FcCacheCreateTagFile(const FcConfig *config);

Description

   This tries to create CACHEDIR.TAG file at the cache directory
   registered to config.

Since

   version 2.9.91

FcDirCacheCreateUUID

Name

   FcDirCacheCreateUUID -- Create .uuid file at a directory

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcDirCacheCreateUUID(FcChar8 *dir, FcBool force,
   FcConfig *config);

Description

   This function is deprecated. it doesn't take any effects.

Since

   version 2.12.92

FcDirCacheDeleteUUID

Name

   FcDirCacheDeleteUUID -- Delete .uuid file

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcDirCacheDeleteUUID(const FcChar8 *dir, FcConfig
   *config);

Description

   This is to delete .uuid file containing an UUID at a font
   directory of dir.

Since

   version 2.13.1
     __________________________________________________________

4.20. FcStrSet and FcStrList

   Table of Contents
   FcStrSetCreate -- create a string set
   FcStrSetMember -- check set for membership
   FcStrSetEqual -- check sets for equality
   FcStrSetAdd -- add to a string set
   FcStrSetAddFilename -- add a filename to a string set
   FcStrSetDel -- delete from a string set
   FcStrSetDestroy -- destroy a string set
   FcStrListCreate -- create a string iterator
   FcStrListFirst -- get first string in iteration
   FcStrListNext -- get next string in iteration
   FcStrListDone -- destroy a string iterator

   A data structure for enumerating strings, used to list
   directories while scanning the configuration as directories are
   added while scanning.

FcStrSetCreate

Name

   FcStrSetCreate -- create a string set

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrSet * FcStrSetCreate(void);

Description

   Create an empty set.

FcStrSetMember

Name

   FcStrSetMember -- check set for membership

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcStrSetMember(FcStrSet *set, const FcChar8 *s);

Description

   Returns whether s is a member of set.

FcStrSetEqual

Name

   FcStrSetEqual -- check sets for equality

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcStrSetEqual(FcStrSet *set_a, FcStrSet *set_b);

Description

   Returns whether set_a contains precisely the same strings as
   set_b. Ordering of strings within the two sets is not
   considered.

FcStrSetAdd

Name

   FcStrSetAdd -- add to a string set

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcStrSetAdd(FcStrSet *set, const FcChar8 *s);

Description

   Adds a copy of s to set.

FcStrSetAddFilename

Name

   FcStrSetAddFilename -- add a filename to a string set

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcStrSetAddFilename(FcStrSet *set, const FcChar8 *s);

Description

   Adds a copy s to set, The copy is created with
   FcStrCopyFilename so that leading '~' values are replaced with
   the value of the HOME environment variable.

FcStrSetDel

Name

   FcStrSetDel -- delete from a string set

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcStrSetDel(FcStrSet *set, const FcChar8 *s);

Description

   Removes s from set, returning FcTrue if s was a member else
   FcFalse.

FcStrSetDestroy

Name

   FcStrSetDestroy -- destroy a string set

Synopsis

#include <fontconfig/fontconfig.h>

   void FcStrSetDestroy(FcStrSet *set);

Description

   Destroys set.

FcStrListCreate

Name

   FcStrListCreate -- create a string iterator

Synopsis

#include <fontconfig/fontconfig.h>

   FcStrList * FcStrListCreate(FcStrSet *set);

Description

   Creates an iterator to list the strings in set.

FcStrListFirst

Name

   FcStrListFirst -- get first string in iteration

Synopsis

#include <fontconfig/fontconfig.h>

   void FcStrListFirst(FcStrList *list);

Description

   Returns the first string in list.

Since

   version 2.11.0

FcStrListNext

Name

   FcStrListNext -- get next string in iteration

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrListNext(FcStrList *list);

Description

   Returns the next string in list.

FcStrListDone

Name

   FcStrListDone -- destroy a string iterator

Synopsis

#include <fontconfig/fontconfig.h>

   void FcStrListDone(FcStrList *list);

Description

   Destroys the enumerator list.
     __________________________________________________________

4.21. String utilities

   Table of Contents
   FcUtf8ToUcs4 -- convert UTF-8 to UCS4
   FcUcs4ToUtf8 -- convert UCS4 to UTF-8
   FcUtf8Len -- count UTF-8 encoded chars
   FcUtf16ToUcs4 -- convert UTF-16 to UCS4
   FcUtf16Len -- count UTF-16 encoded chars
   FcIsLower -- check for lower case ASCII character
   FcIsUpper -- check for upper case ASCII character
   FcToLower -- convert upper case ASCII to lower case
   FcStrCopy -- duplicate a string
   FcStrDowncase -- create a lower case translation of a string
   FcStrCopyFilename -- create a complete path from a filename
   FcStrCmp -- compare UTF-8 strings
   FcStrCmpIgnoreCase -- compare UTF-8 strings ignoring case
   FcStrStr -- locate UTF-8 substring
   FcStrStrIgnoreCase -- locate UTF-8 substring ignoring case
   FcStrPlus -- concatenate two strings
   FcStrFree -- free a string
   FcStrBuildFilename -- Concatenate strings as a file path
   FcStrDirname -- directory part of filename
   FcStrBasename -- last component of filename

   Fontconfig manipulates many UTF-8 strings represented with the
   FcChar8 type. These functions are exposed to help applications
   deal with these UTF-8 strings in a locale-insensitive manner.

FcUtf8ToUcs4

Name

   FcUtf8ToUcs4 -- convert UTF-8 to UCS4

Synopsis

#include <fontconfig/fontconfig.h>

   int FcUtf8ToUcs4(FcChar8 *src, FcChar32 *dst, int len);

Description

   Converts the next Unicode char from src into dst and returns
   the number of bytes containing the char. src must be at least
   len bytes long.

FcUcs4ToUtf8

Name

   FcUcs4ToUtf8 -- convert UCS4 to UTF-8

Synopsis

#include <fontconfig/fontconfig.h>

   int FcUcs4ToUtf8(FcChar32 src, FcChar8 dst[FC_UTF8_MAX_LEN]);

Description

   Converts the Unicode char from src into dst and returns the
   number of bytes needed to encode the char.

FcUtf8Len

Name

   FcUtf8Len -- count UTF-8 encoded chars

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcUtf8Len(FcChar8 *src, int len, int *nchar, int
   *wchar);

Description

   Counts the number of Unicode chars in len bytes of src. Places
   that count in nchar. wchar contains 1, 2 or 4 depending on the
   number of bytes needed to hold the largest Unicode char
   counted. The return value indicates whether src is a
   well-formed UTF8 string.

FcUtf16ToUcs4

Name

   FcUtf16ToUcs4 -- convert UTF-16 to UCS4

Synopsis

#include <fontconfig/fontconfig.h>

   int FcUtf16ToUcs4(FcChar8 *src, FcEndian endian, FcChar32 *dst,
   int len);

Description

   Converts the next Unicode char from src into dst and returns
   the number of bytes containing the char. src must be at least
   len bytes long. Bytes of src are combined into 16-bit units
   according to endian.

FcUtf16Len

Name

   FcUtf16Len -- count UTF-16 encoded chars

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcUtf16Len(FcChar8 *src, FcEndian endian, int len, int
   *nchar, int *wchar);

Description

   Counts the number of Unicode chars in len bytes of src. Bytes
   of src are combined into 16-bit units according to endian.
   Places that count in nchar. wchar contains 1, 2 or 4 depending
   on the number of bytes needed to hold the largest Unicode char
   counted. The return value indicates whether string is a
   well-formed UTF16 string.

FcIsLower

Name

   FcIsLower -- check for lower case ASCII character

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcIsLower(FcChar8 c);

Description

   This macro checks whether c is an lower case ASCII letter.

FcIsUpper

Name

   FcIsUpper -- check for upper case ASCII character

Synopsis

#include <fontconfig/fontconfig.h>

   FcBool FcIsUpper(FcChar8 c);

Description

   This macro checks whether c is a upper case ASCII letter.

FcToLower

Name

   FcToLower -- convert upper case ASCII to lower case

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 FcToLower(FcChar8 c);

Description

   This macro converts upper case ASCII c to the equivalent lower
   case letter.

FcStrCopy

Name

   FcStrCopy -- duplicate a string

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrCopy(const FcChar8 *s);

Description

   Allocates memory, copies s and returns the resulting buffer.
   Yes, this is strdup, but that function isn't available on every
   platform.

FcStrDowncase

Name

   FcStrDowncase -- create a lower case translation of a string

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrDowncase(const FcChar8 *s);

Description

   Allocates memory, copies s, converting upper case letters to
   lower case and returns the allocated buffer.

FcStrCopyFilename

Name

   FcStrCopyFilename -- create a complete path from a filename

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrCopyFilename(const FcChar8 *s);

Description

   FcStrCopyFilename constructs an absolute pathname from s. It
   converts any leading '~' characters in to the value of the HOME
   environment variable, and any relative paths are converted to
   absolute paths using the current working directory. Sequences
   of '/' characters are converted to a single '/', and names
   containing the current directory '.' or parent directory '..'
   are correctly reconstructed. Returns NULL if '~' is the leading
   character and HOME is unset or disabled (see
   FcConfigEnableHome).

FcStrCmp

Name

   FcStrCmp -- compare UTF-8 strings

Synopsis

#include <fontconfig/fontconfig.h>

   int FcStrCmp(const FcChar8 *s1, const FcChar8 *s2);

Description

   Returns the usual <0, 0, >0 result of comparing s1 and s2.

FcStrCmpIgnoreCase

Name

   FcStrCmpIgnoreCase -- compare UTF-8 strings ignoring case

Synopsis

#include <fontconfig/fontconfig.h>

   int FcStrCmpIgnoreCase(const FcChar8 *s1, const FcChar8 *s2);

Description

   Returns the usual <0, 0, >0 result of comparing s1 and s2. This
   test is case-insensitive for all proper UTF-8 encoded strings.

FcStrStr

Name

   FcStrStr -- locate UTF-8 substring

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrStr(const FcChar8 *s1, const FcChar8 *s2);

Description

   Returns the location of s2 in s1. Returns NULL if s2 is not
   present in s1. This test will operate properly with UTF8
   encoded strings.

FcStrStrIgnoreCase

Name

   FcStrStrIgnoreCase -- locate UTF-8 substring ignoring case

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrStrIgnoreCase(const FcChar8 *s1, const FcChar8
   *s2);

Description

   Returns the location of s2 in s1, ignoring case. Returns NULL
   if s2 is not present in s1. This test is case-insensitive for
   all proper UTF-8 encoded strings.

FcStrPlus

Name

   FcStrPlus -- concatenate two strings

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrPlus(const FcChar8 *s1, const FcChar8 *s2);

Description

   This function allocates new storage and places the
   concatenation of s1 and s2 there, returning the new string.

FcStrFree

Name

   FcStrFree -- free a string

Synopsis

#include <fontconfig/fontconfig.h>

   void FcStrFree(FcChar8 *s);

Description

   This is just a wrapper around free(3) which helps track memory
   usage of strings within the fontconfig library.

FcStrBuildFilename

Name

   FcStrBuildFilename -- Concatenate strings as a file path

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrBuildFilename(const FcChar8 *path, ...);

Description

   Creates a filename from the given elements of strings as file
   paths and concatenate them with the appropriate file separator.
   Arguments must be null-terminated. This returns a
   newly-allocated memory which should be freed when no longer
   needed.

FcStrDirname

Name

   FcStrDirname -- directory part of filename

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrDirname(const FcChar8 *file);

Description

   Returns the directory containing file. This is returned in
   newly allocated storage which should be freed when no longer
   needed.

FcStrBasename

Name

   FcStrBasename -- last component of filename

Synopsis

#include <fontconfig/fontconfig.h>

   FcChar8 * FcStrBasename(const FcChar8 *file);

Description

   Returns the filename of file stripped of any leading directory
   names. This is returned in newly allocated storage which should
   be freed when no longer needed.
