xfd(1)
NAME
xfd - display all the characters in an X font
SYNOPSIS
xfd [-options ...] -fn fontname
xfd [-options ...] -fa fontname
DESCRIPTION
The xfd utility creates a window containing the name of the font being
displayed, a row of command buttons, several lines of text for
displaying character metrics, and a grid containing one glyph per cell.
The characters are shown in increasing order from left to right, top to
bottom. The first character displayed at the top left will be
character number 0 unless the -start option has been supplied in which
case the character with the number given in the -start option will be
used.
The characters are displayed in a grid of boxes, each large enough to
hold any single character in the font. Each character glyph is drawn
using the PolyText16 request (used by the Xlib routine XDrawString16)
or the XftDrawString32 routine, depending on whether the -fn or -fa
option was given. If the -box option is given, a rectangle will be
drawn around each character, showing where an ImageText16 request (used
by the Xlib routine XDrawImageString16) would cause background color to
be displayed.
The origin of each glyph is normally set so that the character is drawn
in the upper left hand corner of the grid cell. However, if a glyph
has a negative left bearing or an unusually large ascent, descent, or
right bearing (as is the case with cursor font), some character may not
appear in their own grid cells. The -center option may be used to
force all glyphs to be centered in their respective cells.
All the characters in the font may not fit in the window at once. To
see the next page of glyphs, press the Next button at the top of the
window. To see the previous page, press Prev. To exit xfd, press
Quit.
Individual character metrics (index, width, bearings, ascent and
descent) can be displayed at the top of the window by clicking on the
desired character.
The font name displayed at the top of the window is the full name of
the font, as determined by the server. See xlsfonts and fc-list for
ways to generate lists of fonts, as well as more detailed summaries of
their metrics and properties.
OPTIONS
xfd accepts all of the standard toolkit command line options along with
the additional options listed below:
-fn font
This option specifies the core X server side font to be
displayed. This can also be set with the FontGrid font
resource. A font must be specified.
-fa font
This option specifies a Xft font to be displayed. This can also
be set with the FontGrid face resource. A font pattern must be
specified.
-box This option indicates that a box should be displayed outlining
the area that would be filled with background color by an
ImageText request. This can also be set with the FontGrid
boxChars resource. The default is False.
-center This option indicates that each glyph should be centered in its
grid. This can also be set with the FontGrid centerChars
resource. The default is False.
-start number
This option specifies the glyph index of the upper left hand
corner of the grid. This is used to view characters at
arbitrary locations in the font. This can also be set with the
FontGrid startChar resource. The default is 0.
-bc color
This option specifies the color to be used if ImageText boxes
are drawn. This can also be set with the FontGrid boxColor
resource.
-rows numrows
This option specifies the number of rows in the grid. This can
also be set with the FontGrid cellRows resource.
-columns numcols
This option specifies the number of columns in the grid. This
can also be set with the FontGrid cellColumns resource.
WIDGETS
In order to specify resources, it is useful to know the widgets which
compose xfd. In the notation below, indentation indicates hierarchical
structure. The widget class name is given first, followed by the
widget instance name. The application class name is Xfd.
Xfd xfd
Paned pane
Label fontname
Box box
Command quit
Command prev
Command next
Label select
Label metrics
Label range
Label start
Form form
FontGrid grid
FONTGRID RESOURCES
The FontGrid widget is an application-specific widget, and a subclass
of the Simple widget in the Athena widget set. The effects and
instance names of this widget's resources are given in the OPTIONS
section. Capitalize the first letter of the resource instance name to
get the corresponding class name.
APPLICATION SPECIFIC RESOURCES
The instance names of the application specific resources are given
below. Capitalize the first letter of the resource instance name to
get the corresponding class name. These resources are unlikely to be
interesting unless you are localizing xfd for a different language.
selectFormat
Specifies a printf-style format string used to display
information about the selected character. The default is
"character 0x%02x%02x (%u,%u) (%#o,%#o)". The arguments that
will come after the format string are char.byte1, char.byte2,
char.byte1, char.byte2, char.byte1, char.byte2. char.byte1 is
byte 1 of the selected character. char.byte2 is byte 2 of the
selected character.
metricsFormat
Specifies a printf-style format string used to display
character metrics. The default is "width %d; left %d, right
%d; ascent %d, descent %d (font %d, %d)". The arguments that
will come after the format string are the character metrics
width, lbearing, rbearing, character ascent, character descent,
font ascent, and font descent.
rangeFormat
Specifies a printf-style format string used to display the
range of characters currently being displayed. The default is
"range: 0x%02x%02x (%u,%u) thru 0x%02x%02x (%u,%u)". The
arguments that will come after the format string are the
following fields from the XFontStruct that is returned from
opening the font: min_byte1, min_char_or_byte2, min_byte1,
min_char_or_byte2, max_byte1, max_char_or_byte2, max_byte1,
max_char_or_byte2.
startFormat
Specifies a printf-style format string used to display
information about the character at the upper left corner of the
font grid. The default is "upper left: 0x%04x (%d,%d)". The
arguments that will come after the format string are the new
character, the high byte of the new character, and the low byte
of the new character.
nocharFormat
Specifies a printf-style format string to display when the
selected character does not exist. The default is "no such
character 0x%02x%02x (%u,%u) (%#o,%#o)". The arguments that
will come after the format string are the same as for the
selectFormat resource.
SEE ALSO
X(7), xlsfonts(1), xrdb(1), xfontsel(1), fc-list(1), fonts.conf(5), X
Logical Font Description Conventions
BUGS
The program should skip over pages full of non-existent characters.
AUTHOR
Jim Fulton, MIT X Consortium; previous program of the same name by Mark
Lillibridge, MIT Project Athena.
Free and Open Source Software