NAME

mdbFontset - Fontset

DESCRIPTION

The m17n library loads a fontset definition from the m17n database by the tags <fontset, FONTSET-NAME>. The plist format of the data is as follows:

FONTSET ::= PER-SCRIPT * PER-CHARSET * FALLBACK *
PER-SCRIPT ::= '(' SCRIPT PER-LANGUAGE + ')'
PER-LANGUAGE ::= '(' LANGUAGE FONT-SPEC-ELEMENT + ')'
PER-CHARSET ::= '(' CHARSET FONT-SPEC-ELEMENT + ')'
FALLBACK ::= FONT-SPEC-ELEMENT
FONT-SPEC-ELEMENT ::= '(' FONT-SPEC [ FLT-NAME ] ')'
FONT-SPEC ::=
     '(' [ FOUNDRY FAMILY
           [ WEIGHT [ STYLE [ STRETCH [ ADSTYLE ]]]]]
         REGISTRY
	 [ OTF-SPEC ] [ LANG-SPEC ] ')'

SCRIPT is a symbol of script name (e.g. latin, han) or nil. LANGUAGE is a two-letter symbol of language name code defined by ISO 639 (e.g. ja, zh) or nil.

FONT-SPEC is to specify properties of a font. FOUNDRY to REGISTRY are symbols corresponding to Mfoundry to Mregistry property of a font. See m17nFont for the meaning of each property.

OTF-SPEC is a symbol specifing the required OTF features. The symbol name has the following syntax.

  OTF-SPEC-NAME ::= ':otf=' SCRIPT LANGSYS ? GSUB-FEATURES ? GPOS-FEATURES ?
  SCRIPT ::= SYMBOL
  LANGSYS ::= '/' SYMBOL
  GSUB-FEATURES ::= '=' FEATURE-LIST ?
  GPOS-FEATURES ::= '+' FEATURE-LIST ?
  FEATURE-LIST ::= '~' ? FEATURE ( ',' '~' ? FEATURE ',' )

Here, FEATURE is a four-letter Open Type feature.

LANG-SPEC is a symbol specifying the required language support. The symbol name has the following syntax.

  LANG-SPEC-NAME ::= ':lang=' LANG

Here, LANG is a two or three-letter ISO-639 language code.

FLT-NAME is a name of Font Layout Table (Font Layout Table).

EXAMPLE

This is an example of PER_SCRIPT.

(han
  (ja
    ((jisx0208.1983-0)))
  (zh
    ((gb2312.1980-0)))
  (nil
    ((big5-0))))

It instructs the font selector to use a font of registry 'jisx0208.1983-0' for a 'han' character (i.e. a character whose Mscript property is 'han') if the character has Mlanguage text property 'ja' in an M-text and the character is in the repertories of such fonts. Otherwise, try a font of registry 'gb2312.1980-0' or 'big5-0'. If that 'han' character does not have Mlanguage text property, try all three fonts.

See the function mdraw_text() for the detail of how a font is selected.

COPYRIGHT

Copyright (C) 2001 Information-technology Promotion Agency (IPA)
Copyright (C) 2001-2009 National Institute of Advanced Industrial Science and Technology (AIST)
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License <http://www.gnu.org/licenses/fdl.html>.