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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
-<HTML
-><HEAD
-><TITLE
->Datatypes</TITLE
-><META
-NAME="GENERATOR"
-CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
-REL="HOME"
-HREF="index.html"><LINK
-REL="PREVIOUS"
-TITLE="FUNCTIONAL OVERVIEW"
-HREF="x19.html"><LINK
-REL="NEXT"
-TITLE="FUNCTIONS"
-HREF="x93.html"></HEAD
-><BODY
-CLASS="SECT1"
-BGCOLOR="#FFFFFF"
-TEXT="#000000"
-LINK="#0000FF"
-VLINK="#840084"
-ALINK="#0000FF"
-><DIV
-CLASS="NAVHEADER"
-><TABLE
-SUMMARY="Header navigation table"
-WIDTH="100%"
-BORDER="0"
-CELLPADDING="0"
-CELLSPACING="0"
-><TR
-><TH
-COLSPAN="3"
-ALIGN="center"
-></TH
-></TR
-><TR
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-WIDTH="10%"
-ALIGN="left"
-VALIGN="bottom"
-><A
-HREF="x19.html"
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->Prev</A
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->Next</A
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-><HR
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-WIDTH="100%"></DIV
-><DIV
-CLASS="SECT1"
-><H1
-CLASS="SECT1"
-><A
-NAME="AEN31"
->3. Datatypes</A
-></H1
-><P
->Fontconfig uses abstract datatypes to hide internal implementation details
-for most data structures. A few structures are exposed where appropriate.
- </P
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN34"
->3.1. FcChar8, FcChar16, FcChar32, FcBool</A
-></H2
-><P
->These are primitive datatypes; the FcChar* types hold precisely the number
-of bits stated (if supported by the C implementation). FcBool holds
-one of two CPP symbols: FcFalse or FcTrue.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN37"
->3.2. FcMatrix</A
-></H2
-><P
->An FcMatrix holds an affine transformation, usually used to reshape glyphs.
-A small set of matrix operations are provided to manipulate these.
- <PRE
-CLASS="PROGRAMLISTING"
-> typedef struct _FcMatrix {
- double xx, xy, yx, yy;
- } FcMatrix;
- </PRE
->
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN41"
->3.3. FcCharSet</A
-></H2
-><P
->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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN44"
->3.4. FcType</A
-></H2
-><P
->Tags the kind of data stored in an FcValue.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN47"
->3.5. FcValue</A
-></H2
-><P
->An FcValue object holds a single value with one of a number of different
-types. The 'type' tag indicates which member is valid.
- <PRE
-CLASS="PROGRAMLISTING"
-> typedef struct _FcValue {
- FcType type;
- union {
- const FcChar8 *s;
- int i;
- FcBool b;
- double d;
- const FcMatrix *m;
- const FcCharSet *c;
- } u;
- } FcValue;
- </PRE
->
- <PRE
-CLASS="PROGRAMLISTING"
-> FcValue Members
-
- Type Union member Datatype
- --------------------------------
- FcTypeVoid (none) (none)
- FcTypeInteger i int
- FcTypeDouble d double
- FcTypeString s char *
- FcTypeBool b b
- FcTypeMatrix m FcMatrix *
- FcTypeCharSet c FcCharSet *
- </PRE
->
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN52"
->3.6. FcPattern</A
-></H2
-><P
->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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN55"
->3.7. FcFontSet</A
-></H2
-><P
-> <PRE
-CLASS="PROGRAMLISTING"
-> typedef struct _FcFontSet {
- int nfont;
- int sfont;
- FcPattern **fonts;
- } FcFontSet;
- </PRE
->
-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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN59"
->3.8. FcStrSet, FcStrList</A
-></H2
-><P
->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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN62"
->3.9. FcObjectSet</A
-></H2
-><P
-> <PRE
-CLASS="PROGRAMLISTING"
-> typedef struct _FcObjectSet {
- int nobject;
- int sobject;
- const char **objects;
- } FcObjectSet;
- </PRE
->
-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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN66"
->3.10. FcObjectType</A
-></H2
-><P
-> <PRE
-CLASS="PROGRAMLISTING"
-> typedef struct _FcObjectType {
- const char *object;
- FcType type;
- } FcObjectType;
- </PRE
->
-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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN70"
->3.11. FcConstant</A
-></H2
-><P
-> <PRE
-CLASS="PROGRAMLISTING"
-> typedef struct _FcConstant {
- const FcChar8 *name;
- const char *object;
- int value;
- } FcConstant;
- </PRE
->
-Provides for symbolic constants for new pattern elements. When 'name' is
-seen in a font name, an 'object' element is created with value 'value'.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN74"
->3.12. FcBlanks</A
-></H2
-><P
->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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN77"
->3.13. FcFileCache</A
-></H2
-><P
->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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN80"
->3.14. FcConfig</A
-></H2
-><P
->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 particulat set use one of the FcSetName enumerated
-values.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN83"
->3.15. FcSetName</A
-></H2
-><P
->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.
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN86"
->3.16. FcResult</A
-></H2
-><P
->Used as a return type for functions manipulating FcPattern objects.
- <PRE
-CLASS="PROGRAMLISTING"
-> 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
- </PRE
->
- </P
-></DIV
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN90"
->3.17. FcAtomic</A
-></H2
-><P
->Used for locking access to config files. Provides a safe way to update
-configuration files.
- </P
-></DIV
-></DIV
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