Commit f641ef1a authored by Eli Zaretskii's avatar Eli Zaretskii

Improve documentation of 'font-spec'

* doc/lispref/display.texi (Low-Level Font):
* src/font.c (Ffont_spec): Document 'font-spec' keys that are
supported, but were undocumented.
parent 9d02e6c5
Pipeline #7849 failed with stage
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......@@ -3734,6 +3734,20 @@ Additional typographic style information for the font, such as
The charset registry and encoding of the font, such as
@samp{iso8859-1}. The value should be a string or a symbol.
@item :dpi
The resolution in dots per inch for which the font is designed. The
value must be a non-negative number.
@item :spacing
The spacing of the font: proportional, dual, mono, or charcell. The
value should be either an integer (0 for proportional, 90 for dual,
100 for mono, 110 for charcell) or a one-letter symbol (one of
@code{P}, @code{D}, @code{M}, or @code{C}).
@item :avgwidth
The average width of the font in 1/10 pixel units. The value should
be a non-negative number.
@item :script
The script that the font must support (a symbol).
......
......@@ -3934,6 +3934,23 @@ VALUE must be a non-negative integer or a floating point number
specifying the font size. It specifies the font size in pixels (if
VALUE is an integer), or in points (if VALUE is a float).
`:dpi'
VALUE must be a non-negative number that specifies the resolution
(dot per inch) for which the font is designed.
`:spacing'
VALUE specifies the spacing of the font: mono, proportional, charcell,
or dual. It can be either a number (0 for proportional, 90 for dual,
100 for mono, 110 for charcell) or a 1-letter symbol: `P', `D', `M',
or `C' (lower-case variants are also accepted).
`:avgwidth'
VALUE must be a non-negative integer specifying the average width of
the font in 1/10 pixel units.
`:name'
VALUE must be a string of XLFD-style or fontconfig-style font name.
......
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