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xfd - display all the characters in an X
xfd [-options ...] -fn fontname
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).
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
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
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 for ways to generate lists
of fonts, as well as more detailed summaries of their metrics and properties.
xfd accepts all of the standard toolkit command line options along
with the additional options listed below:
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.
- -fn font
- This option specifies
the font to be displayed. This can also be set with the FontGrid font resource.
A font must be specified.
- 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.
- 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.
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
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
, X Logical Font Description
The program should skip over pages full of non-existent
Jim Fulton, MIT X Consortium; previous program of the
same name by Mark Lillibridge, MIT Project Athena.
- 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
- 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.
- 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.
- 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.
- 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.
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