Commit a908c79a authored by Chong Yidong's avatar Chong Yidong

Document :otf font-spec property.

* display.texi (Low-Level Font): Document :otf font-spec property.
parent 4a16bdc6
2010-02-27 Chong Yidong <cyd@stupidchicken.com>
* display.texi (Low-Level Font): Document :otf font-spec property.
2010-02-01 Stefan Monnier <monnier@iro.umontreal.ca>
* display.texi (Line Height): Avoid obsolete special default variables
......
......@@ -3068,6 +3068,26 @@ The charset registry and encoding of the font, such as
@item :script
The script that the font must support (a symbol).
@item :otf
The font must be an OpenType font that supports these OpenType
features, provided Emacs is compiled with support for @samp{libotf} (a
library for performing complex text layout in certain scripts). The
value must be a list of the form
@smallexample
@code{(@var{script-tag} @var{langsys-tag} @var{gsub} @var{gpos})}
@end smallexample
where @var{script-tag} is the OpenType script tag symbol;
@var{langsys-tag} is the OpenType language system tag symbol, or
@code{nil} to use the default language system; @code{gsub} is a list
of OpenType GSUB feature tag symbols, or @code{nil} if none is
required; and @code{gpos} is a list of OpenType GPOS feature tag
symbols, or @code{nil} if none is required. If @code{gsub} or
@code{gpos} is a list, a @code{nil} element in that list means that
the font must not match any of the remaining tag symbols. The
@code{gpos} element may be omitted.
@end table
@end defun
......
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