xref: /xsrc/external/mit/fontconfig/dist/doc/fontconfig-devel.txt

                Fontconfig Developers Reference, Version 2.11.0

   Copyright © 2002 Keith Packard

   Permission to use, copy, modify, distribute, and sell this software and
   its documentation for any purpose is hereby granted without fee, provided
   that the above copyright notice appear in all copies and that both that
   copyright notice and this permission notice appear in supporting
   documentation, and that the name of the author(s) not be used in
   advertising or publicity pertaining to distribution of the software
   without specific, written prior permission. The authors make no
   representations about the suitability of this software for any purpose. It
   is provided "as is" without express or implied warranty.

   THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
   INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
   EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
   CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
   USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
   OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
   PERFORMANCE OF THIS SOFTWARE.

            -------------------------------------------------------

   Table of Contents

   [1]DESCRIPTION

   [2]FUNCTIONAL OVERVIEW

   [3]Datatypes

   [4]FUNCTIONS

DESCRIPTION

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

   --------------------------------------------------------------------------

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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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 where
                                                  different from family and
                                                  family + style
    fullnamelang   FC_FULLNAMELANG        String  Language corresponding to
                                                  each fullname
    slant          FC_SLANT               Int     Italic, oblique or roman
    weight         FC_WEIGHT              Int     Light, medium, demibold,
                                                  bold or black
    size           FC_SIZE                Double  Point size
    width          FC_WIDTH               Int     Condensed, normal or expanded
    aspect         FC_ASPECT              Double  Stretches glyphs horizontally
                                                  before hinting
    pixelsize      FC_PIXEL_SIZE          Double  Pixel size
    spacing        FC_SPACING             Int     Proportional, dual-width,
                                                  monospace or charcell
    foundry        FC_FOUNDRY             String  Font foundry name
    antialias      FC_ANTIALIAS           Bool    Whether glyphs can be
                                                  antialiased
    hinting        FC_HINTING             Bool    Whether the rasterizer should
                                                  use hinting
    hintstyle      FC_HINT_STYLE          Int     Automatic hinting style
    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 advance data (deprecated)
    file           FC_FILE                String  The filename holding the font
    index          FC_INDEX               Int     The index of the font within
                                                  the file
    ftface         FC_FT_FACE             FT_Face Use the specified FreeType
                                                  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 glyphs can be scaled
    scale          FC_SCALE               Double  Scale factor for point->pixel
                                                  conversions
    dpi            FC_DPI                 Double  Target dots per inch
    rgba           FC_RGBA                Int     unknown, rgb, bgr, vrgb,
                                                  vbgr, none - subpixel geometry
    lcdfilter      FC_LCD_FILTER          Int     Type of LCD filter
    minspace       FC_MINSPACE            Bool    Eliminate leading from line
                                                  spacing
    charset        FC_CHARSET             CharSet Unicode chars encoded by
                                                  the font
    lang           FC_LANG                LangSet Set of RFC-3066-style
                                                  languages this font supports
    fontversion    FC_FONTVERSION         Int     Version number of the font
    capability     FC_CAPABILITY          String  List of layout capabilities in
                                                  the font
    embolden       FC_EMBOLDEN            Bool    Rasterizer should
                                                  synthetically embolden the font
    fontfeatures   FC_FONT_FEATURES       String  List of extra feature tags in
                                                  OpenType to be enabled
    namelang       FC_NAMELANG            String  Language name to be used for the
                                                  default value of familylang,
                                                  stylelang and fullnamelang
    prgname        FC_PRGNAME             String  Name of the running program
    hash           FC_HASH                String  SHA256 hash value of the font data
                                                  with "sha256:" prefix.
    postscriptname FC_POSTSCRIPT_NAME     String  Font name in PostScript


   --------------------------------------------------------------------------

Datatypes

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

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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;


   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  FcType

   Tags the kind of data stored in an FcValue.

   --------------------------------------------------------------------------

  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;
                   } 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 *


   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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'.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

  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 match
           FcResultNoId            Object exists, but has fewer values
                                   than specified
           FcResultOutOfMemory     malloc failed


   --------------------------------------------------------------------------

  FcAtomic

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

   --------------------------------------------------------------------------

  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.

   --------------------------------------------------------------------------

FUNCTIONS

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

   --------------------------------------------------------------------------

  Initialization

   Table of Contents

   [5]FcInitLoadConfig -- load configuration

   [6]FcInitLoadConfigAndFonts -- load configuration and font data

   [7]FcInit -- initialize fontconfig library

   [8]FcFini -- finalize fontconfig library

   [9]FcGetVersion -- library version number

   [10]FcInitReinitialize -- re-initialize library

   [11]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.

Version

   Fontconfig version 2.11.0

                            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.

Version

   Fontconfig version 2.11.0

                                     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.

Version

   Fontconfig version 2.11.0

                                     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.

Version

   Fontconfig version 2.11.0

                                  FcGetVersion

Name

   FcGetVersion -- library version number

Synopsis

   #include <fontconfig/fontconfig.h>


   int FcGetVersion(void);

Description

   Returns the version number of the library.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcPattern

   Table of Contents

   [12]FcPatternCreate -- Create a pattern

   [13]FcPatternDuplicate -- Copy a pattern

   [14]FcPatternReference -- Increment pattern reference count

   [15]FcPatternDestroy -- Destroy a pattern

   [16]FcPatternEqual -- Compare patterns

   [17]FcPatternEqualSubset -- Compare portions of patterns

   [18]FcPatternFilter -- Filter the objects of pattern

   [19]FcPatternHash -- Compute a pattern hash value

   [20]FcPatternAdd -- Add a value to a pattern

   [21]FcPatternAddWeak -- Add a value to a pattern with weak binding

   [22]FcPatternAdd-Type -- Add a typed value to a pattern

   [23]FcPatternGet -- Return a value from a pattern

   [24]FcPatternGet-Type -- Return a typed value from a pattern

   [25]FcPatternBuild -- Create patterns from arguments

   [26]FcPatternDel -- Delete a property from a pattern

   [27]FcPatternRemove -- Remove one object of the specified type from the
   pattern

   [28]FcPatternPrint -- Print a pattern for debugging

   [29]FcDefaultSubstitute -- Perform default substitutions in a pattern

   [30]FcNameParse -- Parse a pattern string

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

   [32]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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

                                FcPatternFilter

Name

   FcPatternFilter -- Filter the objects of pattern

Synopsis

   #include <fontconfig/fontconfig.h>


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

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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                               FcPatternAdd-Type

Name

   FcPatternAddInteger, FcPatternAddDouble, FcPatternAddString,
   FcPatternAddMatrix, FcPatternAddCharSet, FcPatternAddBool,
   FcPatternAddFTFace, FcPatternAddLangSet -- 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_Facef);

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

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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                               FcPatternGet-Type

Name

   FcPatternGetInteger, FcPatternGetDouble, FcPatternGetString,
   FcPatternGetMatrix, FcPatternGetCharSet, FcPatternGetBool,
   FcPatternGetFTFace, FcPatternGetLangSet -- 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);

   FcResult FcPatternGetLangSet(FcPattern *p, const char *object, FT_Face
   *f);

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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                              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).

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                 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().

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcFontSet

   Table of Contents

   [33]FcFontSetCreate -- Create a font set

   [34]FcFontSetDestroy -- Destroy a font set

   [35]FcFontSetAdd -- Add to a font set

   [36]FcFontSetList -- List fonts from a set of font sets

   [37]FcFontSetMatch -- Return the best font from a set of font sets

   [38]FcFontSetPrint -- Print a set of patterns to stdout

   [39]FcFontSetSort -- Add to a font set

   [40]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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                 FcFontSetList

Name

   FcFontSetList -- List fonts from a set of font sets

Synopsis

   #include <fontconfig/fontconfig.h>


   FcFontSet * FcFontSetList(FcConfig *config, FcFontSet **sets, intnsets,
   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.

Version

   Fontconfig version 2.11.0

                                 FcFontSetMatch

Name

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

Synopsis

   #include <fontconfig/fontconfig.h>


   FcPattern * FcFontSetMatch(FcConfig *config, FcFontSet **sets, intnsets,
   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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                 FcFontSetSort

Name

   FcFontSetSort -- Add to a font set

Synopsis

   #include <fontconfig/fontconfig.h>


   FcFontSetSort(FcConfig *config, FcFontSet **sets, intnsets, 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.

Version

   Fontconfig version 2.11.0

                              FcFontSetSortDestroy

Name

   FcFontSetSortDestroy -- DEPRECATED destroy a font set

Synopsis

   #include <fontconfig/fontconfig.h>


   FcFontSetSortDestroy(FcFontSet *set);

Description

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

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcObjectSet

   Table of Contents

   [41]FcObjectSetCreate -- Create an object set

   [42]FcObjectSetAdd -- Add to an object set

   [43]FcObjectSetDestroy -- Destroy an object set

   [44]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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                               FcObjectSetDestroy

Name

   FcObjectSetDestroy -- Destroy an object set

Synopsis

   #include <fontconfig/fontconfig.h>


   void FcObjectSetDestroy(FcObjectSet *os);

Description

   Destroys an object set.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FreeType specific functions

   Table of Contents

   [45]FcFreeTypeCharIndex -- map Unicode to glyph id

   [46]FcFreeTypeCharSet -- compute Unicode coverage

   [47]FcFreeTypeCharSetAndSpacing -- compute Unicode coverage and spacing
   type

   [48]FcFreeTypeQuery -- compute pattern from font file (and index)

   [49]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.

Version

   Fontconfig version 2.11.0

                               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. This
   scans several encoding tables to build as complete a list as possible. If
   'blanks' is not 0, the glyphs in the font are examined and any blank
   glyphs not in 'blanks' are not placed in the returned FcCharSet.

Version

   Fontconfig version 2.11.0

                          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. This
   scans several encoding tables to build as complete a list as possible. If
   'blanks' is not 0, the glyphs in the font are examined and any blank
   glyphs not in 'blanks' are not placed in the returned FcCharSet. 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.

Version

   Fontconfig version 2.11.0

                                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 font in 'file'. The number of
   fonts in 'file' is returned in 'count'.

Version

   Fontconfig version 2.11.0

                              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).

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcValue

   Table of Contents

   [50]FcValueDestroy -- Free a value

   [51]FcValueSave -- Copy a value

   [52]FcValuePrint -- Print a value to stdout

   [53]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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcCharSet

   Table of Contents

   [54]FcCharSetCreate -- Create an empty character set

   [55]FcCharSetDestroy -- Destroy a character set

   [56]FcCharSetAddChar -- Add a character to a charset

   [57]FcCharSetDelChar -- Add a character to a charset

   [58]FcCharSetCopy -- Copy a charset

   [59]FcCharSetEqual -- Compare two charsets

   [60]FcCharSetIntersect -- Intersect charsets

   [61]FcCharSetUnion -- Add charsets

   [62]FcCharSetSubtract -- Subtract charsets

   [63]FcCharSetMerge -- Merge charsets

   [64]FcCharSetHasChar -- Check a charset for a char

   [65]FcCharSetCount -- Count entries in a charset

   [66]FcCharSetIntersectCount -- Intersect and count charsets

   [67]FcCharSetSubtractCount -- Subtract and count charsets

   [68]FcCharSetIsSubset -- Test for charset inclusion

   [69]FcCharSetFirstPage -- Start enumerating charset contents

   [70]FcCharSetNextPage -- Continue enumerating charset contents

   [71]FcCharSetCoverage -- DEPRECATED return coverage for a Unicode page

   [72]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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                FcCharSetDelChar

Name

   FcCharSetDelChar -- Add a character to 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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                            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.

Version

   Fontconfig version 2.11.0

                             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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                               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 0xffff7fff 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 excercise for
   the reader ;).

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                               FcCharSetCoverage

Name

   FcCharSetCoverage -- DEPRECATED return coverage for a Unicode page

Synopsis

   #include <fontconfig/fontconfig.h>


   FcChar32 FcCharSetCoverage(const FcCharSet *a, FcChar32page,
   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.

Version

   Fontconfig version 2.11.0

                                  FcCharSetNew

Name

   FcCharSetNew -- DEPRECATED alias for FcCharSetCreate

Synopsis

   #include <fontconfig/fontconfig.h>


   FcCharSet * FcCharSetNew(void);

Description

   FcCharSetNew is a DEPRECATED alias for FcCharSetCreate.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcLangSet

   Table of Contents

   [73]FcLangSetCreate -- create a langset object

   [74]FcLangSetDestroy -- destroy a langset object

   [75]FcLangSetCopy -- copy a langset object

   [76]FcLangSetAdd -- add a language to a langset

   [77]FcLangSetDel -- delete a language from a langset

   [78]FcLangSetUnion -- Add langsets

   [79]FcLangSetSubtract -- Subtract langsets

   [80]FcLangSetCompare -- compare language sets

   [81]FcLangSetContains -- check langset subset relation

   [82]FcLangSetEqual -- test for matching langsets

   [83]FcLangSetHash -- return a hash value for a langset

   [84]FcLangSetHasLang -- test langset for language support

   [85]FcGetDefaultLangs -- Get the default languages list

   [86]FcGetLangs -- Get list of languages

   [87]FcLangNormalize -- Normalize the language string

   [88]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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                               FcGetDefaultLangs

Name

   FcGetDefaultLangs -- Get the default languages list

Synopsis

   #include <fontconfig/fontconfig.h>


   FcStrSet * FcGetDefaultLangs(voidls);

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.

Version

   Fontconfig version 2.11.0

                                   FcGetLangs

Name

   FcGetLangs -- Get list of languages

Synopsis

   #include <fontconfig/fontconfig.h>


   FcStrSet * FcGetLangs(void);

Description

   Returns a string set of all known languages.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcMatrix

   Table of Contents

   [89]FcMatrixInit -- initialize an FcMatrix structure

   [90]FcMatrixCopy -- Copy a matrix

   [91]FcMatrixEqual -- Compare two matrices

   [92]FcMatrixMultiply -- Multiply matrices

   [93]FcMatrixRotate -- Rotate a matrix

   [94]FcMatrixScale -- Scale a matrix

   [95]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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                 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

Version

   Fontconfig version 2.11.0

                                 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

Version

   Fontconfig version 2.11.0

                                 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

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcConfig

   Table of Contents

   [96]FcConfigCreate -- Create a configuration

   [97]FcConfigReference -- Increment config reference count

   [98]FcConfigDestroy -- Destroy a configuration

   [99]FcConfigSetCurrent -- Set configuration as default

   [100]FcConfigGetCurrent -- Return current configuration

   [101]FcConfigUptoDate -- Check timestamps on config files

   [102]FcConfigHome -- return the current home directory.

   [103]FcConfigEnableHome -- controls use of the home directory.

   [104]FcConfigBuildFonts -- Build font database

   [105]FcConfigGetConfigDirs -- Get config directories

   [106]FcConfigGetFontDirs -- Get font directories

   [107]FcConfigGetConfigFiles -- Get config files

   [108]FcConfigGetCache -- DEPRECATED used to return per-user cache filename

   [109]FcConfigGetCacheDirs -- return the list of directories searched for
   cache files

   [110]FcConfigGetFonts -- Get config font set

   [111]FcConfigGetBlanks -- Get config blanks

   [112]FcConfigGetRescanInterval -- Get config rescan interval

   [113]FcConfigSetRescanInterval -- Set config rescan interval

   [114]FcConfigAppFontAddFile -- Add font file to font database

   [115]FcConfigAppFontAddDir -- Add fonts from directory to font database

   [116]FcConfigAppFontClear -- Remove all app fonts from font database

   [117]FcConfigSubstituteWithPat -- Execute substitutions

   [118]FcConfigSubstitute -- Execute substitutions

   [119]FcFontMatch -- Return best font

   [120]FcFontSort -- Return list of matching fonts

   [121]FcFontRenderPrepare -- Prepare pattern for loading font file

   [122]FcFontList -- List fonts

   [123]FcConfigFilename -- Find a config file

   [124]FcConfigParseAndLoad -- load a configuration file

   [125]FcConfigGetSysRoot -- Obtain the system root directory

   [126]FcConfigSetSysRoot -- Set the system root directory

   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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                               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, returning FcFalse if that call fails.

Version

   Fontconfig version 2.11.0

                               FcConfigGetCurrent

Name

   FcConfigGetCurrent -- Return current configuration

Synopsis

   #include <fontconfig/fontconfig.h>


   FcConfig * FcConfigGetCurrent(void);

Description

   Returns the current default configuration.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                  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).

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                               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 have indeterminate
   effects. Returns FcFalse if this operation runs out of memory. If config
   is NULL, the current configuration is used.

Version

   Fontconfig version 2.11.0

                             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.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

                             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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                               FcConfigGetBlanks

Name

   FcConfigGetBlanks -- Get config blanks

Synopsis

   #include <fontconfig/fontconfig.h>


   FcBlanks * FcConfigGetBlanks(FcConfig *config);

Description

   Returns the FcBlanks object associated with the given configuration, if no
   blanks were present in the configuration, this function will return 0. The
   returned FcBlanks object if not NULL, is valid as long as the owning
   FcConfig is alive. If config is NULL, the current configuration is used.

Version

   Fontconfig version 2.11.0

                           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.

Version

   Fontconfig version 2.11.0

                           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.

Version

   Fontconfig version 2.11.0

                             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). Otherwise returns
   FcTrue. If config is NULL, the current configuration is used.

Version

   Fontconfig version 2.11.0

                             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.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

                           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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                                FcConfigFilename

Name

   FcConfigFilename -- Find a config file

Synopsis

   #include <fontconfig/fontconfig.h>


   FcChar8 * FcConfigFilename(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.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

                               FcConfigGetSysRoot

Name

   FcConfigGetSysRoot -- Obtain the system root directory

Synopsis

   #include <fontconfig/fontconfig.h>


   const FcChar8 * FcConfigGetSysRoot(const FcConfig *config);

Description

   Obtrains the system root directory in 'config' if available.

Version

   Fontconfig version 2.11.0

                               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. fontconfig prepend 'sysroot'
   to the cache directories in order to allow people to generate caches at
   the build time. Note that this causes changing current config. i.e. this
   function calls FcConfigSetCurrent() internally.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcObjectType

   Table of Contents

   [127]FcNameRegisterObjectTypes -- Register object types

   [128]FcNameUnregisterObjectTypes -- Unregister object types

   [129]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.

Version

   Fontconfig version 2.11.0

                          FcNameUnregisterObjectTypes

Name

   FcNameUnregisterObjectTypes -- Unregister object types

Synopsis

   #include <fontconfig/fontconfig.h>


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

Description

   Deprecated. Does nothing. Returns FcFalse.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcConstant

   Table of Contents

   [130]FcNameRegisterConstants -- Register symbolic constants

   [131]FcNameUnregisterConstants -- Unregister symbolic constants

   [132]FcNameGetConstant -- Lookup symbolic constant

   [133]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.

Version

   Fontconfig version 2.11.0

                           FcNameUnregisterConstants

Name

   FcNameUnregisterConstants -- Unregister symbolic constants

Synopsis

   #include <fontconfig/fontconfig.h>


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

Description

   Deprecated. Does nothing. Returns FcFalse.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcBlanks

   Table of Contents

   [134]FcBlanksCreate -- Create an FcBlanks

   [135]FcBlanksDestroy -- Destroy and FcBlanks

   [136]FcBlanksAdd -- Add a character to an FcBlanks

   [137]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.

                                 FcBlanksCreate

Name

   FcBlanksCreate -- Create an FcBlanks

Synopsis

   #include <fontconfig/fontconfig.h>


   FcBlanks * FcBlanksCreate(void);

Description

   Creates an empty FcBlanks object.

Version

   Fontconfig version 2.11.0

                                FcBlanksDestroy

Name

   FcBlanksDestroy -- Destroy and FcBlanks

Synopsis

   #include <fontconfig/fontconfig.h>


   void FcBlanksDestroy(FcBlanks *b);

Description

   Destroys an FcBlanks object, freeing any associated memory.

Version

   Fontconfig version 2.11.0

                                  FcBlanksAdd

Name

   FcBlanksAdd -- Add a character to an FcBlanks

Synopsis

   #include <fontconfig/fontconfig.h>


   FcBool FcBlanksAdd(FcBlanks *b, FcChar32 ucs4);

Description

   Adds a single character to an FcBlanks object, returning FcFalse if this
   process ran out of memory.

Version

   Fontconfig version 2.11.0

                                FcBlanksIsMember

Name

   FcBlanksIsMember -- Query membership in an FcBlanks

Synopsis

   #include <fontconfig/fontconfig.h>


   FcBool FcBlanksIsMember(FcBlanks *b, FcChar32 ucs4);

Description

   Returns whether the specified FcBlanks object contains the indicated
   Unicode value.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcAtomic

   Table of Contents

   [138]FcAtomicCreate -- create an FcAtomic object

   [139]FcAtomicLock -- lock a file

   [140]FcAtomicNewFile -- return new temporary file name

   [141]FcAtomicOrigFile -- return original file name

   [142]FcAtomicReplaceOrig -- replace original with new

   [143]FcAtomicDeleteNew -- delete new file

   [144]FcAtomicUnlock -- unlock a file

   [145]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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                FcAtomicOrigFile

Name

   FcAtomicOrigFile -- return original file name

Synopsis

   #include <fontconfig/fontconfig.h>


   FcChar8 * FcAtomicOrigFile(FcAtomic *atomic);

Description

   Returns the file referenced by atomic.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                 FcAtomicUnlock

Name

   FcAtomicUnlock -- unlock a file

Synopsis

   #include <fontconfig/fontconfig.h>


   void FcAtomicUnlock(FcAtomic *atomic);

Description

   Unlocks the file.

Version

   Fontconfig version 2.11.0

                                FcAtomicDestroy

Name

   FcAtomicDestroy -- destroy an FcAtomic object

Synopsis

   #include <fontconfig/fontconfig.h>


   void FcAtomicDestroy(FcAtomic *atomic);

Description

   Destroys atomic.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  File and Directory routines

   Table of Contents

   [146]FcFileScan -- scan a font file

   [147]FcFileIsDir -- check whether a file is a directory

   [148]FcDirScan -- scan a font directory without caching it

   [149]FcDirSave -- DEPRECATED: formerly used to save a directory cache

   [150]FcDirCacheUnlink -- Remove all caches related to dir

   [151]FcDirCacheValid -- check directory cache

   [152]FcDirCacheLoad -- load a directory cache

   [153]FcDirCacheRead -- read or construct a directory cache

   [154]FcDirCacheLoadFile -- load a cache file

   [155]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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                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

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcCache routines

   Table of Contents

   [156]FcCacheDir -- Return directory of cache

   [157]FcCacheCopySet -- Returns a copy of the fontset from cache

   [158]FcCacheSubdir -- Return the i'th subdirectory.

   [159]FcCacheNumSubdir -- Return the number of subdirectories in cache.

   [160]FcCacheNumFont -- Returns the number of fonts in cache.

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

   [162]FcCacheCreateTagFile -- Create CACHEDIR.TAG at cache directory.

   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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                 FcCacheSubdir

Name

   FcCacheSubdir -- Return the i'th subdirectory.

Synopsis

   #include <fontconfig/fontconfig.h>


   const FcChar8 * FcCacheSubdir(const FcCache *cache, inti);

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.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                FcDirCacheClean

Name

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

Synopsis

   #include <fontconfig/fontconfig.h>


   FcBool FcDirCacheClean(const FcChar8 *cache_dir, FcBoolverbose);

Description



Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  FcStrSet and FcStrList

   Table of Contents

   [163]FcStrSetCreate -- create a string set

   [164]FcStrSetMember -- check set for membership

   [165]FcStrSetEqual -- check sets for equality

   [166]FcStrSetAdd -- add to a string set

   [167]FcStrSetAddFilename -- add a filename to a string set

   [168]FcStrSetDel -- delete from a string set

   [169]FcStrSetDestroy -- destroy a string set

   [170]FcStrListCreate -- create a string iterator

   [171]FcStrListFirst -- get first string in iteration

   [172]FcStrListNext -- get next string in iteration

   [173]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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                              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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                FcStrSetDestroy

Name

   FcStrSetDestroy -- destroy a string set

Synopsis

   #include <fontconfig/fontconfig.h>


   void FcStrSetDestroy(FcStrSet *set);

Description

   Destroys set.

Version

   Fontconfig version 2.11.0

                                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.

Version

   Fontconfig version 2.11.0

                                 FcStrListFirst

Name

   FcStrListFirst -- get first string in iteration

Synopsis

   #include <fontconfig/fontconfig.h>


   void FcStrListFirst(FcStrList *list);

Description

   Returns the first string in list.

Version

   Fontconfig 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.

Version

   Fontconfig version 2.11.0

                                 FcStrListDone

Name

   FcStrListDone -- destroy a string iterator

Synopsis

   #include <fontconfig/fontconfig.h>


   void FcStrListDone(FcStrList *list);

Description

   Destroys the enumerator list.

Version

   Fontconfig version 2.11.0

   --------------------------------------------------------------------------

  String utilities

   Table of Contents

   [174]FcUtf8ToUcs4 -- convert UTF-8 to UCS4

   [175]FcUcs4ToUtf8 -- convert UCS4 to UTF-8

   [176]FcUtf8Len -- count UTF-8 encoded chars

   [177]FcUtf16ToUcs4 -- convert UTF-16 to UCS4

   [178]FcUtf16Len -- count UTF-16 encoded chars

   [179]FcIsLower -- check for lower case ASCII character

   [180]FcIsUpper -- check for upper case ASCII character

   [181]FcToLower -- convert upper case ASCII to lower case

   [182]FcStrCopy -- duplicate a string

   [183]FcStrDowncase -- create a lower case translation of a string

   [184]FcStrCopyFilename -- create a complete path from a filename

   [185]FcStrCmp -- compare UTF-8 strings

   [186]FcStrCmpIgnoreCase -- compare UTF-8 strings ignoring case

   [187]FcStrStr -- locate UTF-8 substring

   [188]FcStrStrIgnoreCase -- locate UTF-8 substring ignoring ASCII case

   [189]FcStrPlus -- concatenate two strings

   [190]FcStrFree -- free a string

   [191]FcStrDirname -- directory part of filename

   [192]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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                                   FcIsLower

Name

   FcIsLower -- check for lower case ASCII character

Synopsis

   #include <fontconfig/fontconfig.h>


   FcBool FcIsLower(FcChar8c);

Description

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

Version

   Fontconfig version 2.11.0

                                   FcIsUpper

Name

   FcIsUpper -- check for upper case ASCII character

Synopsis

   #include <fontconfig/fontconfig.h>


   FcBool FcIsUpper(FcChar8c);

Description

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

Version

   Fontconfig version 2.11.0

                                   FcToLower

Name

   FcToLower -- convert upper case ASCII to lower case

Synopsis

   #include <fontconfig/fontconfig.h>


   FcChar8 FcToLower(FcChar8c);

Description

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

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

                               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).

Version

   Fontconfig version 2.11.0

                                    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.

Version

   Fontconfig version 2.11.0

                               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.

Version

   Fontconfig version 2.11.0

                                    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.

Version

   Fontconfig version 2.11.0

                               FcStrStrIgnoreCase

Name

   FcStrStrIgnoreCase -- locate UTF-8 substring ignoring ASCII 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.

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                                   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.

Version

   Fontconfig version 2.11.0

                                  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.

Version

   Fontconfig version 2.11.0

                                 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.

Version

   Fontconfig version 2.11.0

References

   Visible links
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   5. file:///tmp/html-6vSr2R#FCINITLOADCONFIG
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   7. file:///tmp/html-6vSr2R#FCINIT
   8. file:///tmp/html-6vSr2R#FCFINI
   9. file:///tmp/html-6vSr2R#FCGETVERSION
  10. file:///tmp/html-6vSr2R#FCINITREINITIALIZE
  11. file:///tmp/html-6vSr2R#FCINITBRINGUPTODATE
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  13. file:///tmp/html-6vSr2R#FCPATTERNDUPLICATE
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  26. file:///tmp/html-6vSr2R#FCPATTERNDEL
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  28. file:///tmp/html-6vSr2R#FCPATTERNPRINT
  29. file:///tmp/html-6vSr2R#FCDEFAULTSUBSTITUTE
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  36. file:///tmp/html-6vSr2R#FCFONTSETLIST
  37. file:///tmp/html-6vSr2R#FCFONTSETMATCH
  38. file:///tmp/html-6vSr2R#FCFONTSETPRINT
  39. file:///tmp/html-6vSr2R#FCFONTSETSORT
  40. file:///tmp/html-6vSr2R#FCFONTSETSORTDESTROY
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  52. file:///tmp/html-6vSr2R#FCVALUEPRINT
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  56. file:///tmp/html-6vSr2R#FCCHARSETADDCHAR
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  80. file:///tmp/html-6vSr2R#FCLANGSETCOMPARE
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  96. file:///tmp/html-6vSr2R#FCCONFIGCREATE
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