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authorReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
committerReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
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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
+>FUNCTIONAL OVERVIEW</TITLE
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+REL="HOME"
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+><DIV
+CLASS="SECT1"
+><H1
+CLASS="SECT1"
+><A
+NAME="AEN19"
+>2. FUNCTIONAL OVERVIEW</A
+></H1
+><P
+>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.
+ </P
+><DIV
+CLASS="SECT2"
+><H2
+CLASS="SECT2"
+><A
+NAME="AEN22"
+>2.1. FONT CONFIGURATION</A
+></H2
+><P
+>The configuration module consists of the FcConfig datatype, libexpat and
+FcConfigParse which walks over an XML tree and ammends 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.
+ </P
+><P
+>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.
+ </P
+><P
+>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.
+ </P
+></DIV
+><DIV
+CLASS="SECT2"
+><H2
+CLASS="SECT2"
+><A
+NAME="AEN27"
+>2.2. FONT PROPERTIES</A
+></H2
+><P
+>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 applications rendering mechanism.
+ </P
+><PRE
+CLASS="PROGRAMLISTING"
+> Property Definitions
+
+ Property CPP Symbol Type Description
+ ----------------------------------------------------
+ family FC_FAMILY String Font family names
+ familylang FC_FAMILYLANG String Language cooresponding to
+ each family name
+ style FC_STYLE String Font style. Overrides weight
+ and slant
+ stylelang FC_STYLELANG String Language cooresponding to
+ each style name
+ fullname FC_FULLNAME String Font face full name where
+ different from family and
+ family + style
+ fullnamelang FC_FULLNAMELANG String Language cooresponding 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
+ 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
+ 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-&#62;pixel
+ conversions
+ dpi FC_DPI Double Target dots per inch
+ rgba FC_RGBA Int unknown, rgb, bgr, vrgb,
+ vbgr, none - subpixel geometry
+ minspace FC_MINSPACE Bool Eliminate leading from line
+ spacing
+ charset FC_CHARSET CharSet Unicode chars encoded by
+ the font
+ lang FC_LANG String List 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
+ </PRE
+></DIV
+></DIV
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+ALIGN="LEFT"
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+SUMMARY="Footer navigation table"
+WIDTH="100%"
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+> \ No newline at end of file