загрузить экранный шрифт консоли EGA / VGA (load EGA/VGA console screen font)
Имя (Name)
setfont - load EGA/VGA console screen font
Синопсис (Synopsis)
setfont [-O font+umap.orig] [-o font.orig] [-om cmap.orig] [-ou
umap.orig] [-N] [font.new ...] [-m cmap] [-u umap] [-C console]
[-hH] [-v] [-V]
Описание (Description)
The setfont command reads a font from the file font.new and loads
it into the EGA/VGA character generator, and optionally outputs
the previous font. It can also load various mapping tables and
output the previous versions.
If no args are given (or only the option -N for some number N),
then a default (8xN) font is loaded (see below). One may give
several small fonts, all containing a Unicode table, and setfont
will combine them and load the union. Typical use:
setfont
Load a default font.
setfont drdos8x16
Load a given font (here the 448-glyph drdos font).
setfont cybercafe -u cybercafe
Load a given font that does not have a Unicode map and
provide one explicitly.
setfont LatArCyrHeb-19 -m 8859-2
Load a given font (here a 512-glyph font combining several
character sets) and indicate that one's local character
set is ISO 8859-2.
Note: if a font has more than 256 glyphs, only 8 out of 16 colors
can be used simultaneously. It can make console perception worse
(loss of intensity and even some colors).
FONT FORMATS
The standard Linux font format is the PSF font. It has a header
describing font properties like character size, followed by the
glyph bitmaps, optionally followed by a Unicode mapping table
giving the Unicode value for each glyph. Several other
(obsolete) font formats are recognized. If the input file has
code page format (probably with suffix .cp), containing three
fonts with sizes e.g. 8x8, 8x14 and 8x16, then one of the options
-8 or -14 or -16 must be used to select one. Raw font files are
binary files of size 256*N bytes, containing bit images for each
of 256 characters, one byte per scan line, and N bytes per
character (0 < N <= 32). Most fonts have a width of 8 bits, but
with the framebuffer device (fb) other widths can be used.
FONT HEIGHT
The program setfont has no built-in knowledge of VGA video modes,
but just asks the kernel to load the character ROM of the video
card with certain bitmaps. However, since Linux 1.3.1 the kernel
knows enough about EGA/VGA video modes to select a different line
distance. The default character height will be the number N
inferred from the font or specified by option. However, the user
can specify a different character height H using the -h option.
CONSOLE MAPS
Several mappings are involved in the path from user program
output to console display. If the console is in utf8 mode (see
unicode_start(1)) then the kernel expects that user program
output is coded as UTF-8 (see utf-8(7)), and converts that to
Unicode (ucs2). Otherwise, a translation table is used from the
8-bit program output to 16-bit Unicode values. Such a translation
table is called a Unicode console map. There are four of them:
three built into the kernel, the fourth settable using the -m
option of setfont. An escape sequence chooses between these four
tables; after loading a cmap, setfont will output the escape
sequence Esc ( K that makes it the active translation.
Suitable arguments for the -m option are for example 8859-1,
8859-2, ..., 8859-15, cp437, ..., cp1250.
Given the Unicode value of the symbol to be displayed, the kernel
finds the right glyph in the font using the Unicode mapping info
of the font and displays it.
Old fonts do not have Unicode mapping info, and in order to
handle them there are direct-to-font maps (also loaded using -m)
that give a correspondence between user bytes and font positions.
The most common correspondence is the one given in the file
trivial (where user byte values are used directly as font
positions). Other correspondences are sometimes preferable since
the PC video hardware expects line drawing characters in certain
font positions.
Giving a -m none argument inhibits the loading and activation of
a mapping table. The previous console map can be saved to a file
using the -om file option. These options of setfont render
mapscrn(8) obsolete. (However, it may be useful to read that man
page.)
UNICODE FONT MAPS
The correspondence between the glyphs in the font and Unicode
values is described by a Unicode mapping table. Many fonts have
a Unicode mapping table included in the font file, and an
explicit table can be indicated using the -u option. The program
setfont will load such a Unicode mapping table, unless a -u none
argument is given. The previous Unicode mapping table will be
saved as part of the saved font file when the -O option is used.
It can be saved to a separate file using the -ou file option.
These options of setfont render loadunimap(8) obsolete.
The Unicode mapping table should assign some glyph to the
`missing character' value U+fffd, otherwise missing characters
are not translated, giving a usually very confusing result.
Usually no mapping table is needed, and a Unicode mapping table
is already contained in the font (sometimes this is indicated by
the .psfu extension), so that most users need not worry about the
precise meaning and functioning of these mapping tables.
One may add a Unicode mapping table to a psf font using
psfaddtable(1).
Параметры (Options)
-h H Override font height.
-d Doubles the size of the font, by replicating all of its
pixels vertically and horizontally. This is suitable for
high pixel density (e.g. "4k") displays on which the
standard fonts are too small to be easily legible. Due to
kernel limitations, this is suitable only for 16x16 or
smaller fonts.
-m file
Load console map or Unicode console map from file.
-o file
Save previous font in file.
-O file
Save previous font and Unicode map in file.
-om file
Store console map in file.
-ou file
Save previous Unicode map in file.
-u file
Load Unicode table describing the font from file.
-C console
Set the font for the indicated console. (May require root
permissions.)
-v Be verbose.
-V Print version and exit.
Примечание (Note)
PC video hardware allows one to use the "intensity" bit either to
indicate brightness, or to address 512 (instead of 256) glyphs in
the font. So, if the font has more than 256 glyphs, the console
will be reduced to 8 (instead of 16) colors.
Файлы (Files)
@DATADIR@/consolefonts
The default font directory.
@DATADIR@/unimaps
The default directory for Unicode maps.
@DATADIR@/consoletrans
The default directory for screen mappings.
The default font is a file default (or default8xN if the -N
option was given for some number N) perhaps with suitable
extension (like .psf).
Смотри также (See also)
psfaddtable(1), unicode_start(1), loadunimap(8), utf-8(7),
mapscrn(8)
