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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<HTML
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><HEAD
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><TITLE
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>Datatypes</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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REL="HOME"
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HREF="t1.html"><LINK
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REL="PREVIOUS"
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TITLE="FUNCTIONAL OVERVIEW"
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HREF="x19.html"><LINK
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REL="NEXT"
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TITLE="FUNCTIONS"
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HREF="x102.html"></HEAD
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HREF="x19.html"
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ACCESSKEY="P"
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><<< Previous</A
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></TD
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><TD
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WIDTH="10%"
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VALIGN="bottom"
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><A
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HREF="x102.html"
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ACCESSKEY="N"
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>Next >>></A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="AEN31"
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>Datatypes</A
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></H1
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><P
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>Fontconfig uses abstract datatypes to hide internal implementation details
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for most data structures. A few structures are exposed where appropriate.
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</P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN34"
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>FcChar8, FcChar16, FcChar32, FcBool</A
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></H2
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><P
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>These are primitive datatypes; the FcChar* types hold precisely the number
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of bits stated (if supported by the C implementation). FcBool holds
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one of two CPP symbols: FcFalse or FcTrue.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN37"
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>FcMatrix</A
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></H2
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><P
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>An FcMatrix holds an affine transformation, usually used to reshape glyphs.
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A small set of matrix operations are provided to manipulate these.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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> typedef struct _FcMatrix {
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double xx, xy, yx, yy;
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} FcMatrix;
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</PRE
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></TD
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></TR
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></TABLE
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>
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN41"
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>FcCharSet</A
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></H2
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><P
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>An FcCharSet is an abstract type that holds the set of encoded unicode chars
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in a font. Operations to build and compare these sets are provided.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN44"
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>FcLangSet</A
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></H2
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><P
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>An FcLangSet is an abstract type that holds the set of languages supported
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by a font. Operations to build and compare these sets are provided. These
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are computed for a font based on orthographic information built into the
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fontconfig library. Fontconfig has orthographies for all of the ISO 639-1
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languages except for MS, NA, PA, PS, QU, RN, RW, SD, SG, SN, SU and ZA. If
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you have orthographic information for any of these languages, please submit
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them.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN47"
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>FcLangResult</A
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></H2
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><P
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>An FcLangResult is an enumeration used to return the results of comparing
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two language strings or FcLangSet objects. FcLangEqual means the
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objects match language and territory. FcLangDifferentTerritory means
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the objects match in language but differ in territory.
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FcLangDifferentLang means the objects differ in language.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN50"
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>FcType</A
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></H2
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><P
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>Tags the kind of data stored in an FcValue.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN53"
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>FcValue</A
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></H2
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><P
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>An FcValue object holds a single value with one of a number of different
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types. The 'type' tag indicates which member is valid.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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> typedef struct _FcValue {
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FcType type;
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union {
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const FcChar8 *s;
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int i;
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FcBool b;
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double d;
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const FcMatrix *m;
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const FcCharSet *c;
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void *f;
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const FcLangSet *l;
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} u;
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} FcValue;
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</PRE
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></TD
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></TR
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></TABLE
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>
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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> FcValue Members
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Type Union member Datatype
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--------------------------------
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FcTypeVoid (none) (none)
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FcTypeInteger i int
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FcTypeDouble d double
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FcTypeString s FcChar8 *
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FcTypeBool b b
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FcTypeMatrix m FcMatrix *
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FcTypeCharSet c FcCharSet *
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FcTypeFTFace f void * (FT_Face)
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FcTypeLangSet l FcLangSet *
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</PRE
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></TD
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></TR
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></TABLE
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2006-11-25 11:41:30 -07:00
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>
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN58"
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>FcPattern</A
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></H2
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><P
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>holds a set of names with associated value lists; each name refers to a
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property of a font. FcPatterns are used as inputs to the matching code as
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well as holding information about specific fonts. Each property can hold
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one or more values; conventionally all of the same type, although the
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interface doesn't demand that.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN61"
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>FcFontSet</A
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></H2
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><P
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2010-03-25 15:45:57 -06:00
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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> typedef struct _FcFontSet {
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int nfont;
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int sfont;
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FcPattern **fonts;
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} FcFontSet;
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</PRE
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></TD
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></TR
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></TABLE
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2006-11-25 11:41:30 -07:00
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>
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An FcFontSet contains a list of FcPatterns. Internally fontconfig uses this
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data structure to hold sets of fonts. Externally, fontconfig returns the
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results of listing fonts in this format. 'nfont' holds the number of
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patterns in the 'fonts' array; 'sfont' is used to indicate the size of that
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array.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN65"
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>FcStrSet, FcStrList</A
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></H2
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><P
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>FcStrSet holds a list of strings that can be appended to and enumerated.
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Its unique characteristic is that the enumeration works even while strings
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are appended during enumeration. FcStrList is used during enumeration to
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safely and correctly walk the list of strings even while that list is edited
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in the middle of enumeration.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN68"
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>FcObjectSet</A
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></H2
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><P
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2010-03-25 15:45:57 -06:00
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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2006-11-25 11:41:30 -07:00
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CLASS="PROGRAMLISTING"
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> typedef struct _FcObjectSet {
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int nobject;
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int sobject;
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const char **objects;
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} FcObjectSet;
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</PRE
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2010-03-25 15:45:57 -06:00
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></TD
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></TR
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></TABLE
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2006-11-25 11:41:30 -07:00
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>
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holds a set of names and is used to specify which fields from fonts are
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placed in the the list of returned patterns when listing fonts.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN72"
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>FcObjectType</A
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></H2
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><P
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2010-03-25 15:45:57 -06:00
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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2006-11-25 11:41:30 -07:00
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CLASS="PROGRAMLISTING"
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> typedef struct _FcObjectType {
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const char *object;
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FcType type;
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} FcObjectType;
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</PRE
|
2010-03-25 15:45:57 -06:00
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></TD
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></TR
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></TABLE
|
2006-11-25 11:41:30 -07:00
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>
|
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|
marks the type of a pattern element generated when parsing font names.
|
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Applications can add new object types so that font names may contain the new
|
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|
elements.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
|
2009-04-05 10:43:35 -06:00
|
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|
NAME="AEN76"
|
2010-03-25 15:45:57 -06:00
|
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|
>FcConstant</A
|
2006-11-25 11:41:30 -07:00
|
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></H2
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><P
|
2010-03-25 15:45:57 -06:00
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> <TABLE
|
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BORDER="0"
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|
BGCOLOR="#E0E0E0"
|
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WIDTH="100%"
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><TR
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><TD
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><PRE
|
2006-11-25 11:41:30 -07:00
|
|
|
CLASS="PROGRAMLISTING"
|
|
|
|
> typedef struct _FcConstant {
|
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|
const FcChar8 *name;
|
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|
|
const char *object;
|
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|
|
int value;
|
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|
|
} FcConstant;
|
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|
</PRE
|
2010-03-25 15:45:57 -06:00
|
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|
></TD
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></TR
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|
></TABLE
|
2006-11-25 11:41:30 -07:00
|
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|
>
|
|
|
|
Provides for symbolic constants for new pattern elements. When 'name' is
|
|
|
|
seen in a font name, an 'object' element is created with value 'value'.
|
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|
|
</P
|
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|
></DIV
|
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><DIV
|
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|
|
CLASS="SECT2"
|
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|
|
><H2
|
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|
|
CLASS="SECT2"
|
|
|
|
><A
|
2009-04-05 10:43:35 -06:00
|
|
|
NAME="AEN80"
|
2010-03-25 15:45:57 -06:00
|
|
|
>FcBlanks</A
|
2006-11-25 11:41:30 -07:00
|
|
|
></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
|
2009-04-05 10:43:35 -06:00
|
|
|
NAME="AEN83"
|
2010-03-25 15:45:57 -06:00
|
|
|
>FcFileCache</A
|
2006-11-25 11:41:30 -07:00
|
|
|
></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
|
2009-04-05 10:43:35 -06:00
|
|
|
NAME="AEN86"
|
2010-03-25 15:45:57 -06:00
|
|
|
>FcConfig</A
|
2006-11-25 11:41:30 -07:00
|
|
|
></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
|
2009-04-05 10:43:35 -06:00
|
|
|
NAME="AEN89"
|
2010-03-25 15:45:57 -06:00
|
|
|
>FcSetName</A
|
2006-11-25 11:41:30 -07:00
|
|
|
></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
|
2009-04-05 10:43:35 -06:00
|
|
|
NAME="AEN92"
|
2010-03-25 15:45:57 -06:00
|
|
|
>FcResult</A
|
2006-11-25 11:41:30 -07:00
|
|
|
></H2
|
|
|
|
><P
|
|
|
|
>Used as a return type for functions manipulating FcPattern objects.
|
2010-03-25 15:45:57 -06:00
|
|
|
<TABLE
|
|
|
|
BORDER="0"
|
|
|
|
BGCOLOR="#E0E0E0"
|
|
|
|
WIDTH="100%"
|
|
|
|
><TR
|
|
|
|
><TD
|
|
|
|
><PRE
|
2006-11-25 11:41:30 -07:00
|
|
|
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
|
2010-03-25 15:45:57 -06:00
|
|
|
></TD
|
|
|
|
></TR
|
|
|
|
></TABLE
|
2006-11-25 11:41:30 -07:00
|
|
|
>
|
|
|
|
</P
|
|
|
|
></DIV
|
|
|
|
><DIV
|
|
|
|
CLASS="SECT2"
|
|
|
|
><H2
|
|
|
|
CLASS="SECT2"
|
|
|
|
><A
|
2009-04-05 10:43:35 -06:00
|
|
|
NAME="AEN96"
|
2010-03-25 15:45:57 -06:00
|
|
|
>FcAtomic</A
|
2006-11-25 11:41:30 -07:00
|
|
|
></H2
|
|
|
|
><P
|
|
|
|
>Used for locking access to config files. Provides a safe way to update
|
|
|
|
configuration files.
|
|
|
|
</P
|
|
|
|
></DIV
|
2009-04-05 10:43:35 -06:00
|
|
|
><DIV
|
|
|
|
CLASS="SECT2"
|
|
|
|
><H2
|
|
|
|
CLASS="SECT2"
|
|
|
|
><A
|
|
|
|
NAME="AEN99"
|
2010-03-25 15:45:57 -06:00
|
|
|
>FcCache</A
|
2009-04-05 10:43:35 -06:00
|
|
|
></H2
|
|
|
|
><P
|
|
|
|
>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.
|
|
|
|
</P
|
|
|
|
></DIV
|
2006-11-25 11:41:30 -07:00
|
|
|
></DIV
|
|
|
|
><DIV
|
|
|
|
CLASS="NAVFOOTER"
|
|
|
|
><HR
|
|
|
|
ALIGN="LEFT"
|
|
|
|
WIDTH="100%"><TABLE
|
|
|
|
SUMMARY="Footer navigation table"
|
|
|
|
WIDTH="100%"
|
|
|
|
BORDER="0"
|
|
|
|
CELLPADDING="0"
|
|
|
|
CELLSPACING="0"
|
|
|
|
><TR
|
|
|
|
><TD
|
|
|
|
WIDTH="33%"
|
|
|
|
ALIGN="left"
|
|
|
|
VALIGN="top"
|
|
|
|
><A
|
|
|
|
HREF="x19.html"
|
|
|
|
ACCESSKEY="P"
|
2010-03-25 15:45:57 -06:00
|
|
|
><<< Previous</A
|
2006-11-25 11:41:30 -07:00
|
|
|
></TD
|
|
|
|
><TD
|
|
|
|
WIDTH="34%"
|
|
|
|
ALIGN="center"
|
|
|
|
VALIGN="top"
|
|
|
|
><A
|
2010-03-25 15:45:57 -06:00
|
|
|
HREF="t1.html"
|
2006-11-25 11:41:30 -07:00
|
|
|
ACCESSKEY="H"
|
|
|
|
>Home</A
|
|
|
|
></TD
|
|
|
|
><TD
|
|
|
|
WIDTH="33%"
|
|
|
|
ALIGN="right"
|
|
|
|
VALIGN="top"
|
|
|
|
><A
|
2009-04-05 10:43:35 -06:00
|
|
|
HREF="x102.html"
|
2006-11-25 11:41:30 -07:00
|
|
|
ACCESSKEY="N"
|
2010-03-25 15:45:57 -06:00
|
|
|
>Next >>></A
|
2006-11-25 11:41:30 -07:00
|
|
|
></TD
|
|
|
|
></TR
|
|
|
|
><TR
|
|
|
|
><TD
|
|
|
|
WIDTH="33%"
|
|
|
|
ALIGN="left"
|
|
|
|
VALIGN="top"
|
|
|
|
>FUNCTIONAL OVERVIEW</TD
|
|
|
|
><TD
|
|
|
|
WIDTH="34%"
|
|
|
|
ALIGN="center"
|
|
|
|
VALIGN="top"
|
|
|
|
> </TD
|
|
|
|
><TD
|
|
|
|
WIDTH="33%"
|
|
|
|
ALIGN="right"
|
|
|
|
VALIGN="top"
|
|
|
|
>FUNCTIONS</TD
|
|
|
|
></TR
|
|
|
|
></TABLE
|
|
|
|
></DIV
|
|
|
|
></BODY
|
|
|
|
></HTML
|
|
|
|
>
|