255 lines
7.9 KiB
HTML
255 lines
7.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//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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>FUNCTIONAL OVERVIEW</TITLE
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><H1
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CLASS="SECT1"
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><A
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NAME="AEN19"
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>2. FUNCTIONAL OVERVIEW</A
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></H1
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><P
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>Fontconfig contains two essential modules, the configuration module which
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builds an internal configuration from XML files and the matching module
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which accepts font patterns and returns the nearest matching font.
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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="AEN22"
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>2.1. FONT CONFIGURATION</A
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></H2
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><P
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>The configuration module consists of the FcConfig datatype, libexpat and
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FcConfigParse which walks over an XML tree and ammends a configuration with
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data found within. From an external perspective, configuration of the
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library consists of generating a valid XML tree and feeding that to
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FcConfigParse. The only other mechanism provided to applications for
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changing the running configuration is to add fonts and directories to the
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list of application-provided font files.
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</P
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><P
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>The intent is to make font configurations relatively static, and shared by
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as many applications as possible. It is hoped that this will lead to more
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stable font selection when passing names from one application to another.
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XML was chosen as a configuration file format because it provides a format
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which is easy for external agents to edit while retaining the correct
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structure and syntax.
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</P
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><P
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>Font configuration is separate from font matching; applications needing to
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do their own matching can access the available fonts from the library and
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perform private matching. The intent is to permit applications to pick and
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choose appropriate functionality from the library instead of forcing them to
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choose between this library and a private configuration mechanism. The hope
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is that this will ensure that configuration of fonts for all applications
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can be centralized in one place. Centralizing font configuration will
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simplify and regularize font installation and customization.
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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="AEN27"
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>2.2. FONT PROPERTIES</A
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></H2
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><P
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>While font patterns may contain essentially any properties, there are some
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well known properties with associated types. Fontconfig uses some of these
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properties for font matching and font completion. Others are provided as a
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convenience for the applications rendering mechanism.
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</P
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><PRE
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CLASS="PROGRAMLISTING"
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> Property Definitions
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Property CPP Symbol Type Description
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----------------------------------------------------
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family FC_FAMILY String Font family names
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familylang FC_FAMILYLANG String Language cooresponding to
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each family name
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style FC_STYLE String Font style. Overrides weight
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and slant
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stylelang FC_STYLELANG String Language cooresponding to
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each style name
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fullname FC_FULLNAME String Font face full name where
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different from family and
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family + style
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fullnamelang FC_FULLNAMELANG String Language cooresponding to
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each fullname
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slant FC_SLANT Int Italic, oblique or roman
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weight FC_WEIGHT Int Light, medium, demibold,
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bold or black
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size FC_SIZE Double Point size
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width FC_WIDTH Int Condensed, normal or expanded
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aspect FC_ASPECT Double Stretches glyphs horizontally
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before hinting
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pixelsize FC_PIXEL_SIZE Double Pixel size
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spacing FC_SPACING Int Proportional, dual-width,
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monospace or charcell
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foundry FC_FOUNDRY String Font foundry name
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antialias FC_ANTIALIAS Bool Whether glyphs can be
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antialiased
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hinting FC_HINTING Bool Whether the rasterizer should
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use hinting
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hintstyle FC_HINT_STYLE Int Automatic hinting style
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verticallayout FC_VERTICAL_LAYOUT Bool Use vertical layout
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autohint FC_AUTOHINT Bool Use autohinter instead of
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normal hinter
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globaladvance FC_GLOBAL_ADVANCE Bool Use font global advance data
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file FC_FILE String The filename holding the font
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index FC_INDEX Int The index of the font within
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the file
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ftface FC_FT_FACE FT_Face Use the specified FreeType
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face object
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rasterizer FC_RASTERIZER String Which rasterizer is in use
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outline FC_OUTLINE Bool Whether the glyphs are outlines
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scalable FC_SCALABLE Bool Whether glyphs can be scaled
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scale FC_SCALE Double Scale factor for point->pixel
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conversions
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dpi FC_DPI Double Target dots per inch
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rgba FC_RGBA Int unknown, rgb, bgr, vrgb,
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vbgr, none - subpixel geometry
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lcdfilter FC_LCD_FILTER Int Type of LCD filter
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minspace FC_MINSPACE Bool Eliminate leading from line
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spacing
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charset FC_CHARSET CharSet Unicode chars encoded by
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the font
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lang FC_LANG LangSet Set of RFC-3066-style
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languages this font supports
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fontversion FC_FONTVERSION Int Version number of the font
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capability FC_CAPABILITY String List of layout capabilities in
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the font
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embolden FC_EMBOLDEN Bool Rasterizer should
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synthetically embolden the font
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</PRE
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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CELLSPACING="0"
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><TR
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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HREF="index.html"
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>Prev</A
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>Next</A
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WIDTH="33%"
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WIDTH="34%"
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> </TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
|
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>Datatypes</TD
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></TR
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> |