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Update the documentation due to changes in loading font backends

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* doc/emacs/msdos.texi (Windows Fonts): Reflect the fact that
Uniscribe is not enabled by default.
This commit is contained in:
Eli Zaretskii 2019-06-01 15:06:25 +03:00
parent a8a114af4f
commit bb999339ce
1 changed files with 17 additions and 11 deletions
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28
doc/emacs/msdos.texi
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@ -996,17 +996,23 @@ HarfBuzz support, and if the HarfBuzz DLL is installed on your system;
like @code{uniscribe}, this backend supports only TrueType and
OpenType fonts. Some languages requiring complex layout can only be
properly supported by the Uniscribe or HarfBuzz backends. By default,
all backends are enabled if supported, with @code{harfbuzz} taking
priority over @code{uniscribe}, and @code{uniscribe} taking priority
over @code{gdi}. To override that and use the GDI backend even if
Uniscribe is available, invoke Emacs with the @kbd{-xrm
Emacs.fontBackend:gdi} command-line argument, or add a
@code{Emacs.fontBackend} resource with the value @code{gdi} in the
Registry under either the @samp{HKEY_CURRENT_USER\SOFTWARE\GNU\Emacs}
or the @samp{HKEY_LOCAL_MACHINE\SOFTWARE\GNU\Emacs} key
(@pxref{Resources}). Similarly, to use the Uniscribe backend even if
HarfBuzz is available, use @kbd{-xrm Emacs.fontBackend:uniscribe} on
the command line that invokes Emacs.
two backends are enabled for each frame: @code{gdi} and either
@code{harfbuzz} or @code{uniscribe}, depending on which one is
available (if both are available, only @code{harfbuzz} is enabled by
default). The @code{harfbuzz} and @code{uniscribe} backends take
priority over @code{gdi} when Emacs looks for a suitable font. To
override that and use the GDI backend even if Uniscribe is available,
invoke Emacs with the @kbd{-xrm Emacs.fontBackend:gdi} command-line
argument, or add a @code{Emacs.fontBackend} resource with the value
@code{gdi} in the Registry under either the
@samp{HKEY_CURRENT_USER\SOFTWARE\GNU\Emacs} or the
@samp{HKEY_LOCAL_MACHINE\SOFTWARE\GNU\Emacs} key (@pxref{Resources}).
Similarly, to use the Uniscribe backend even if HarfBuzz is available,
use @kbd{-xrm Emacs.fontBackend:uniscribe} on the command line that
invokes Emacs. You can also request all the 3 backends via the
@code{font-backend} frame parameter, but be warned that in that case
font searches for characters for which no fonts are available on the
system will take longer.
@cindex font properties (MS Windows)
@noindent