xwininfo fontconfig libX11 libXau libXext libxcb mesa pixman

xkeyboard-config git update 27 Aug 2012

1 files changed, 478 insertions, 539 deletions

diff --git a/libX11/man/XLoadFont.man b/libX11/man/XLoadFont.man
index 008d6d1ba..2d2d1422d 100644
--- a/libX11/man/XLoadFont.man
+++ b/libX11/man/XLoadFont.man
@@ -1,539 +1,478 @@
-.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium

-.\"

-.\" Permission is hereby granted, free of charge, to any person obtaining

-.\" a copy of this software and associated documentation files (the

-.\" "Software"), to deal in the Software without restriction, including

-.\" without limitation the rights to use, copy, modify, merge, publish,

-.\" distribute, sublicense, and/or sell copies of the Software, and to

-.\" permit persons to whom the Software is furnished to do so, subject to

-.\" the following conditions:

-.\"

-.\" The above copyright notice and this permission notice shall be included

-.\" in all copies or substantial portions of the Software.

-.\"

-.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

-.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

-.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

-.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR

-.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

-.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

-.\" OTHER DEALINGS IN THE SOFTWARE.

-.\"

-.\" Except as contained in this notice, the name of the X Consortium shall

-.\" not be used in advertising or otherwise to promote the sale, use or

-.\" other dealings in this Software without prior written authorization

-.\" from the X Consortium.

-.\"

-.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by

-.\" Digital Equipment Corporation

-.\"

-.\" Portions Copyright \(co 1990, 1991 by

-.\" Tektronix, Inc.

-.\"

-.\" Permission to use, copy, modify and distribute this documentation for

-.\" any purpose and without fee is hereby granted, provided that the above

-.\" copyright notice appears in all copies and that both that copyright notice

-.\" and this permission notice appear in all copies, and that the names of

-.\" Digital and Tektronix not be used in in advertising or publicity pertaining

-.\" to this documentation without specific, written prior permission.

-.\" Digital and Tektronix makes no representations about the suitability

-.\" of this documentation for any purpose.

-.\" It is provided ``as is'' without express or implied warranty.

-.\" 

-.\"

-.ds xT X Toolkit Intrinsics \- C Language Interface

-.ds xW Athena X Widgets \- C Language X Toolkit Interface

-.ds xL Xlib \- C Language X Interface

-.ds xC Inter-Client Communication Conventions Manual

-.na

-.de Ds

-.nf

-.\\$1D \\$2 \\$1

-.ft 1

-.\".ps \\n(PS

-.\".if \\n(VS>=40 .vs \\n(VSu

-.\".if \\n(VS<=39 .vs \\n(VSp

-..

-.de De

-.ce 0

-.if \\n(BD .DF

-.nr BD 0

-.in \\n(OIu

-.if \\n(TM .ls 2

-.sp \\n(DDu

-.fi

-..

-.de FD

-.LP

-.KS

-.TA .5i 3i

-.ta .5i 3i

-.nf

-..

-.de FN

-.fi

-.KE

-.LP

-..

-.de IN		\" send an index entry to the stderr

-..

-.de C{

-.KS

-.nf

-.D

-.\"

-.\"	choose appropriate monospace font

-.\"	the imagen conditional, 480,

-.\"	may be changed to L if LB is too

-.\"	heavy for your eyes...

-.\"

-.ie "\\*(.T"480" .ft L

-.el .ie "\\*(.T"300" .ft L

-.el .ie "\\*(.T"202" .ft PO

-.el .ie "\\*(.T"aps" .ft CW

-.el .ft R

-.ps \\n(PS

-.ie \\n(VS>40 .vs \\n(VSu

-.el .vs \\n(VSp

-..

-.de C}

-.DE

-.R

-..

-.de Pn

-.ie t \\$1\fB\^\\$2\^\fR\\$3

-.el \\$1\fI\^\\$2\^\fP\\$3

-..

-.de ZN

-.ie t \fB\^\\$1\^\fR\\$2

-.el \fI\^\\$1\^\fP\\$2

-..

-.de hN

-.ie t <\fB\\$1\fR>\\$2

-.el <\fI\\$1\fP>\\$2

-..

-.de NT

-.ne 7

-.ds NO Note

-.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2

-.if \\n(.$ .if !'\\$1'C' .ds NO \\$1

-.ie n .sp

-.el .sp 10p

-.TB

-.ce

-\\*(NO

-.ie n .sp

-.el .sp 5p

-.if '\\$1'C' .ce 99

-.if '\\$2'C' .ce 99

-.in +5n

-.ll -5n

-.R

-..

-.		\" Note End -- doug kraft 3/85

-.de NE

-.ce 0

-.in -5n

-.ll +5n

-.ie n .sp

-.el .sp 10p

-..

-.ny0

-.de EX

-.sp

-.nf

-.ft CW

-..

-.de EE

-.ft R

-.fi

-.sp

-..

-.TH XLoadFont __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"

-.SH NAME

-XLoadFont, XQueryFont, XLoadQueryFont, XFreeFont, XGetFontProperty, XUnloadFont, XCharStruct, XFontProp, XChar2b, XFontStruct \- load or unload fonts and font metric structures

-.SH SYNTAX

-.HP

-Font XLoadFont\^(\^Display *\fIdisplay\fP\^, char *\fIname\fP\^); 

-.HP

-XFontStruct *XQueryFont\^(\^Display *\fIdisplay\fP\^, XID \fIfont_ID\fP\^); 

-.HP

-XFontStruct *XLoadQueryFont\^(\^Display *\fIdisplay\fP\^, char

-*\fIname\fP\^); 

-.HP

-int XFreeFont\^(\^Display *\fIdisplay\fP\^, XFontStruct *\fIfont_struct\fP\^);

-.HP

-Bool XGetFontProperty\^(\^XFontStruct *\fIfont_struct\fP\^, Atom \fIatom\fP\^,

-unsigned long *\fIvalue_return\fP\^); 

-.HP

-int XUnloadFont\^(\^Display *\fIdisplay\fP\^, Font \fIfont\fP\^); 

-.SH ARGUMENTS

-.IP \fIatom\fP 1i

-Specifies the atom for the property name you want returned.

-.IP \fIdisplay\fP 1i

-Specifies the connection to the X server.

-.IP \fIfont\fP 1i

-Specifies the font.

-.IP \fIfont_ID\fP 1i

-Specifies the font ID or the 

-.ZN GContext

-ID.

-.IP \fIfont_struct\fP 1i

-Specifies the storage associated with the font.

-.IP \fIgc\fP 1i

-Specifies the GC.

-.IP \fIname\fP 1i

-Specifies the name of the font,

-which is a null-terminated string.

-.IP \fIvalue_return\fP 1i

-Returns the value of the font property.

-.SH DESCRIPTION

-The

-.ZN XLoadFont

-function loads the specified font and returns its associated font ID.

-If the font name is not in the Host Portable Character Encoding,

-the result is implementation-dependent.

-Use of uppercase or lowercase does not matter.

-When the characters ``?'' and ``*'' are used in a font name, a

-pattern match is performed and any matching font is used.

-In the pattern, 

-the ``?'' character will match any single character, 

-and the ``*'' character will match any number of characters.

-A structured format for font names is specified in the X Consortium standard 

-\fIX Logical Font Description Conventions\fP.

-If 

-.ZN XLoadFont

-was unsuccessful at loading the specified font, 

-a 

-.ZN BadName 

-error results.

-Fonts are not associated with a particular screen 

-and can be stored as a component

-of any GC.

-When the font is no longer needed, call 

-.ZN XUnloadFont .

-.LP

-.ZN XLoadFont

-can generate

-.ZN BadAlloc 

-and

-.ZN BadName 

-errors.

-.LP

-The

-.ZN XQueryFont

-function returns a pointer to the

-.ZN XFontStruct

-structure, which contains information associated with the font.

-You can query a font or the font stored in a GC.

-The font ID stored in the 

-.ZN XFontStruct

-structure will be the 

-.ZN GContext 

-ID, and you need to be careful when using this ID in other functions

-(see

-.ZN XGContextFromGC ).

-If the font does not exist,

-.ZN XQueryFont

-returns NULL.

-To free this data, use

-.ZN XFreeFontInfo .

-.LP

-.ZN XLoadQueryFont

-can generate a

-.ZN BadAlloc 

-error.

-.LP

-The

-.ZN XLoadQueryFont

-function provides the most common way for accessing a font.

-.ZN XLoadQueryFont

-both opens (loads) the specified font and returns a pointer to the

-appropriate

-.ZN XFontStruct

-structure.

-If the font name is not in the Host Portable Character Encoding,

-the result is implementation-dependent.

-If the font does not exist,

-.ZN XLoadQueryFont

-returns NULL.

-.LP

-The

-.ZN XFreeFont

-function deletes the association between the font resource ID and the specified 

-font and frees the

-.ZN XFontStruct

-structure.

-The font itself will be freed when no other resource references it.

-The data and the font should not be referenced again.

-.LP

-.ZN XFreeFont

-can generate a

-.ZN BadFont 

-error.

-.LP

-Given the atom for that property,

-the

-.ZN XGetFontProperty

-function returns the value of the specified font property. 

-.ZN XGetFontProperty

-also returns 

-.ZN False

-if the property was not defined or 

-.ZN True

-if it was defined.

-A set of predefined atoms exists for font properties,

-which can be found in

-.hN X11/Xatom.h .

-This set contains the standard properties associated with

-a font.

-Although it is not guaranteed,

-it is likely that the predefined font properties will be present.

-.LP

-The

-.ZN XUnloadFont

-function deletes the association between the font resource ID and the specified font.

-The font itself will be freed when no other resource references it.

-The font should not be referenced again.

-.LP

-.ZN XUnloadFont

-can generate a

-.ZN BadFont 

-error.

-.SH STRUCTURES

-The

-.ZN XFontStruct

-structure contains all of the information for the font

-and consists of the font-specific information as well as

-a pointer to an array of

-.ZN XCharStruct

-structures for the

-characters contained in the font.

-The

-.ZN XFontStruct ,

-.ZN XFontProp ,

-and

-.ZN XCharStruct

-structures contain:

-.LP

-.IN "XCharStruct" "" "@DEF@"

-.EX

-typedef struct {

-	short lbearing;	/\&* origin to left edge of raster */

-	short rbearing;	/\&* origin to right edge of raster */

-	short width;	/\&* advance to next char's origin */

-	short ascent;	/\&* baseline to top edge of raster */

-	short descent;	/\&* baseline to bottom edge of raster */

-	unsigned short attributes;	/\&* per char flags (not predefined) */

-} XCharStruct;

-.EE

-.LP

-.IN "XFontProp" "" "@DEF@"

-.EX

-typedef struct {

-	Atom	name;

-	unsigned long card32;

-} XFontProp;

-.EE

-.LP

-.IN "XChar2b" "" "@DEF@"

-.EX

-typedef struct {	/\&* normal 16 bit characters are two bytes */

-    unsigned char byte1;

-    unsigned char byte2;

-} XChar2b;

-.EE

-.LP

-.IN "XFontStruct" "" "@DEF@"

-.EX

-typedef struct {

-	XExtData *ext_data;	/\&* hook for extension to hang data */

-	Font fid;	/\&* Font id for this font */

-	unsigned direction;	/\&* hint about the direction font is painted */

-	unsigned min_char_or_byte2;	/\&* first character */

-	unsigned max_char_or_byte2;	/\&* last character */

-	unsigned min_byte1;	/\&* first row that exists */

-	unsigned max_byte1;	/\&* last row that exists */

-	Bool all_chars_exist;	/\&* flag if all characters have nonzero size */

-	unsigned default_char;	/\&* char to print for undefined character */

-	int n_properties;	/\&* how many properties there are */

-	XFontProp *properties;	/\&* pointer to array of additional properties */

-	XCharStruct min_bounds;	/\&* minimum bounds over all existing char */

-	XCharStruct max_bounds;	/\&* maximum bounds over all existing char */

-	XCharStruct *per_char;	/\&* first_char to last_char information */

-	int ascent;	/\&* logical extent above baseline for spacing */

-	int descent;	/\&* logical decent below baseline for spacing */

-} XFontStruct;

-.EE

-.LP

-X supports single byte/character, two bytes/character matrix,

-and 16-bit character text operations.

-Note that any of these forms can be used with a font, but a

-single byte/character text request can only specify a single byte

-(that is, the first row of a 2-byte font).

-You should view 2-byte fonts as a two-dimensional matrix of defined

-characters: byte1 specifies the range of defined rows and

-byte2 defines the range of defined columns of the font.

-Single byte/character fonts have one row defined, and the byte2 range

-specified in the structure defines a range of characters.

-.LP

-The bounding box of a character is defined by the 

-.ZN XCharStruct 

-of that character.

-When characters are absent from a font,

-the default_char is used.

-When fonts have all characters of the same size,

-only the information in the

-.ZN XFontStruct

-min and max bounds are used.

-.LP

-The members of the 

-.ZN XFontStruct 

-have the following semantics:

-.IP \(bu 5

-The direction member can be either 

-.ZN FontLeftToRight 

-or 

-.ZN FontRightToLeft . 

-It is just a hint as to whether most 

-.ZN XCharStruct 

-elements 

-have a positive 

-.Pn ( FontLeftToRight ) 

-or a negative 

-.Pn ( FontRightToLeft )

-character width 

-metric.

-The core protocol defines no support for vertical text.

-.IP \(bu 5

-If the min_byte1 and max_byte1 members are both zero, min_char_or_byte2

-specifies the linear character index corresponding to the first element

-of the per_char array, and max_char_or_byte2 specifies the linear character

-index of the last element.

-.IP

-If either min_byte1 or max_byte1 are nonzero, both

-min_char_or_byte2 and max_char_or_byte2 are less than 256, 

-and the 2-byte character index values corresponding to the

-per_char array element N (counting from 0) are:

-.IP

-.EX

-	byte1 = N/D + min_byte1

-	byte2 = N\\D + min_char_or_byte2

-.EE

-where:

-.EX

-        D = max_char_or_byte2 \- min_char_or_byte2 + 1

-        / = integer division

-        \e\e = integer modulus

-.EE

-.IP \(bu 5

-If the per_char pointer is NULL, 

-all glyphs between the first and last character indexes

-inclusive have the same information,

-as given by both min_bounds and max_bounds.

-.IP \(bu 5

-If all_chars_exist is 

-.ZN True ,

-all characters in the per_char array have nonzero bounding boxes.

-.IP \(bu 5

-The default_char member specifies the character that will be used when an

-undefined or nonexistent character is printed.  

-The default_char is a 16-bit character (not a 2-byte character).

-For a font using 2-byte matrix format, 

-the default_char has byte1 in the most-significant byte

-and byte2 in the least significant byte.

-If the default_char itself specifies an undefined or nonexistent character, 

-no printing is performed for an undefined or nonexistent character.

-.IP \(bu 5

-The min_bounds and max_bounds members contain the most extreme values of

-each individual 

-.ZN XCharStruct 

-component over all elements of this array

-(and ignore nonexistent characters).

-The bounding box of the font (the smallest

-rectangle enclosing the shape obtained by superimposing all of the

-characters at the same origin [x,y]) has its upper-left coordinate at:

-.Ds

-	[x + min_bounds.lbearing, y \- max_bounds.ascent]

-.De

-.IP

-Its width is:

-.Ds

-	max_bounds.rbearing \- min_bounds.lbearing

-.De

-.IP

-Its height is:

-.Ds

-	max_bounds.ascent + max_bounds.descent

-.De

-.IP \(bu 5

-The ascent member is the logical extent of the font above the baseline that is

-used for determining line spacing.

-Specific characters may extend beyond

-this.

-.IP \(bu 5

-The descent member is the logical extent of the font at or below the

-baseline that is used for determining line spacing.

-Specific characters may extend beyond this.

-.IP \(bu 5

-If the baseline is at Y-coordinate y,

-the logical extent of the font is inclusive between the Y-coordinate 

-values (y \- font.ascent) and (y + font.descent \- 1).

-Typically,

-the minimum interline spacing between rows of text is given

-by ascent + descent.

-.LP

-For a character origin at [x,y],

-the bounding box of a character (that is, 

-the smallest rectangle that encloses the character's shape)

-described in terms of 

-.ZN XCharStruct 

-components is a rectangle with its upper-left corner at:

-.LP

-.Ds

-[x + lbearing, y \- ascent]

-.De

-.LP

-Its width is:

-.LP

-.Ds

-rbearing \- lbearing

-.De

-.LP

-Its height is:

-.LP

-.Ds

-ascent + descent

-.De

-.LP

-The origin for the next character is defined to be:

-.LP

-.Ds

-[x + width, y]

-.De

-.LP

-The lbearing member defines the extent of the left edge of the character ink

-from the origin.

-The rbearing member defines the extent of the right edge of the character ink

-from the origin.

-The ascent member defines the extent of the top edge of the character ink

-from the origin.

-The descent member defines the extent of the bottom edge of the character ink

-from the origin.

-The width member defines the logical width of the character.

-.SH DIAGNOSTICS

-.TP 1i

-.ZN BadAlloc

-The server failed to allocate the requested resource or server memory.

-.TP 1i

-.ZN BadFont

-A value for a Font or GContext argument does not name a defined Font.

-.TP 1i

-.ZN BadName

-A font or color of the specified name does not exist.

-.SH "SEE ALSO"

-XCreateGC(__libmansuffix__),

-XListFonts(__libmansuffix__),

-XSetFontPath(__libmansuffix__)

-.br

-\fI\*(xL\fP

+.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining
+.\" a copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation the rights to use, copy, modify, merge, publish,
+.\" distribute, sublicense, and/or sell copies of the Software, and to
+.\" permit persons to whom the Software is furnished to do so, subject to
+.\" the following conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be included
+.\" in all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
+.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+.\" OTHER DEALINGS IN THE SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of the X Consortium shall
+.\" not be used in advertising or otherwise to promote the sale, use or
+.\" other dealings in this Software without prior written authorization
+.\" from the X Consortium.
+.\"
+.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
+.\" Digital Equipment Corporation
+.\"
+.\" Portions Copyright \(co 1990, 1991 by
+.\" Tektronix, Inc.
+.\"
+.\" Permission to use, copy, modify and distribute this documentation for
+.\" any purpose and without fee is hereby granted, provided that the above
+.\" copyright notice appears in all copies and that both that copyright notice
+.\" and this permission notice appear in all copies, and that the names of
+.\" Digital and Tektronix not be used in in advertising or publicity pertaining
+.\" to this documentation without specific, written prior permission.
+.\" Digital and Tektronix makes no representations about the suitability
+.\" of this documentation for any purpose.
+.\" It is provided ``as is'' without express or implied warranty.
+.\" 
+.\"
+.ds xT X Toolkit Intrinsics \- C Language Interface
+.ds xW Athena X Widgets \- C Language X Toolkit Interface
+.ds xL Xlib \- C Language X Interface
+.ds xC Inter-Client Communication Conventions Manual
+.na
+.de Ds
+.nf
+.\\$1D \\$2 \\$1
+.ft CW
+.\".ps \\n(PS
+.\".if \\n(VS>=40 .vs \\n(VSu
+.\".if \\n(VS<=39 .vs \\n(VSp
+..
+.de De
+.ce 0
+.if \\n(BD .DF
+.nr BD 0
+.in \\n(OIu
+.if \\n(TM .ls 2
+.sp \\n(DDu
+.fi
+..
+.de IN		\" send an index entry to the stderr
+..
+.de Pn
+.ie t \\$1\fB\^\\$2\^\fR\\$3
+.el \\$1\fI\^\\$2\^\fP\\$3
+..
+.de ZN
+.ie t \fB\^\\$1\^\fR\\$2
+.el \fI\^\\$1\^\fP\\$2
+..
+.de hN
+.ie t <\fB\\$1\fR>\\$2
+.el <\fI\\$1\fP>\\$2
+..
+.ny0
+.de EX
+.sp
+.nf
+.ft CW
+..
+.de EE
+.ft R
+.fi
+.sp
+..
+.TH XLoadFont __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
+.SH NAME
+XLoadFont, XQueryFont, XLoadQueryFont, XFreeFont, XGetFontProperty, XUnloadFont, XCharStruct, XFontProp, XChar2b, XFontStruct \- load or unload fonts and font metric structures
+.SH SYNTAX
+.HP
+Font XLoadFont\^(\^Display *\fIdisplay\fP\^, char *\fIname\fP\^); 
+.HP
+XFontStruct *XQueryFont\^(\^Display *\fIdisplay\fP\^, XID \fIfont_ID\fP\^); 
+.HP
+XFontStruct *XLoadQueryFont\^(\^Display *\fIdisplay\fP\^, char
+*\fIname\fP\^); 
+.HP
+int XFreeFont\^(\^Display *\fIdisplay\fP\^, XFontStruct *\fIfont_struct\fP\^);
+.HP
+Bool XGetFontProperty\^(\^XFontStruct *\fIfont_struct\fP\^, Atom \fIatom\fP\^,
+unsigned long *\fIvalue_return\fP\^); 
+.HP
+int XUnloadFont\^(\^Display *\fIdisplay\fP\^, Font \fIfont\fP\^); 
+.SH ARGUMENTS
+.IP \fIatom\fP 1i
+Specifies the atom for the property name you want returned.
+.IP \fIdisplay\fP 1i
+Specifies the connection to the X server.
+.IP \fIfont\fP 1i
+Specifies the font.
+.IP \fIfont_ID\fP 1i
+Specifies the font ID or the 
+.ZN GContext
+ID.
+.IP \fIfont_struct\fP 1i
+Specifies the storage associated with the font.
+.IP \fIgc\fP 1i
+Specifies the GC.
+.IP \fIname\fP 1i
+Specifies the name of the font,
+which is a null-terminated string.
+.IP \fIvalue_return\fP 1i
+Returns the value of the font property.
+.SH DESCRIPTION
+The
+.ZN XLoadFont
+function loads the specified font and returns its associated font ID.
+If the font name is not in the Host Portable Character Encoding,
+the result is implementation-dependent.
+Use of uppercase or lowercase does not matter.
+When the characters ``?'' and ``*'' are used in a font name, a
+pattern match is performed and any matching font is used.
+In the pattern, 
+the ``?'' character will match any single character, 
+and the ``*'' character will match any number of characters.
+A structured format for font names is specified in the X Consortium standard 
+\fIX Logical Font Description Conventions\fP.
+If 
+.ZN XLoadFont
+was unsuccessful at loading the specified font, 
+a 
+.ZN BadName 
+error results.
+Fonts are not associated with a particular screen 
+and can be stored as a component
+of any GC.
+When the font is no longer needed, call 
+.ZN XUnloadFont .
+.LP
+.ZN XLoadFont
+can generate
+.ZN BadAlloc 
+and
+.ZN BadName 
+errors.
+.LP
+The
+.ZN XQueryFont
+function returns a pointer to the
+.ZN XFontStruct
+structure, which contains information associated with the font.
+You can query a font or the font stored in a GC.
+The font ID stored in the 
+.ZN XFontStruct
+structure will be the 
+.ZN GContext 
+ID, and you need to be careful when using this ID in other functions
+(see
+.ZN XGContextFromGC ).
+If the font does not exist,
+.ZN XQueryFont
+returns NULL.
+To free this data, use
+.ZN XFreeFontInfo .
+.LP
+.ZN XLoadQueryFont
+can generate a
+.ZN BadAlloc 
+error.
+.LP
+The
+.ZN XLoadQueryFont
+function provides the most common way for accessing a font.
+.ZN XLoadQueryFont
+both opens (loads) the specified font and returns a pointer to the
+appropriate
+.ZN XFontStruct
+structure.
+If the font name is not in the Host Portable Character Encoding,
+the result is implementation-dependent.
+If the font does not exist,
+.ZN XLoadQueryFont
+returns NULL.
+.LP
+The
+.ZN XFreeFont
+function deletes the association between the font resource ID and the specified 
+font and frees the
+.ZN XFontStruct
+structure.
+The font itself will be freed when no other resource references it.
+The data and the font should not be referenced again.
+.LP
+.ZN XFreeFont
+can generate a
+.ZN BadFont 
+error.
+.LP
+Given the atom for that property,
+the
+.ZN XGetFontProperty
+function returns the value of the specified font property. 
+.ZN XGetFontProperty
+also returns 
+.ZN False
+if the property was not defined or 
+.ZN True
+if it was defined.
+A set of predefined atoms exists for font properties,
+which can be found in
+.hN X11/Xatom.h .
+This set contains the standard properties associated with
+a font.
+Although it is not guaranteed,
+it is likely that the predefined font properties will be present.
+.LP
+The
+.ZN XUnloadFont
+function deletes the association between the font resource ID and the specified font.
+The font itself will be freed when no other resource references it.
+The font should not be referenced again.
+.LP
+.ZN XUnloadFont
+can generate a
+.ZN BadFont 
+error.
+.SH STRUCTURES
+The
+.ZN XFontStruct
+structure contains all of the information for the font
+and consists of the font-specific information as well as
+a pointer to an array of
+.ZN XCharStruct
+structures for the
+characters contained in the font.
+The
+.ZN XFontStruct ,
+.ZN XFontProp ,
+and
+.ZN XCharStruct
+structures contain:
+.LP
+.IN "XCharStruct" "" "@DEF@"
+.EX
+typedef struct {
+	short lbearing;	/\&* origin to left edge of raster */
+	short rbearing;	/\&* origin to right edge of raster */
+	short width;	/\&* advance to next char's origin */
+	short ascent;	/\&* baseline to top edge of raster */
+	short descent;	/\&* baseline to bottom edge of raster */
+	unsigned short attributes;	/\&* per char flags (not predefined) */
+} XCharStruct;
+.EE
+.LP
+.IN "XFontProp" "" "@DEF@"
+.EX
+typedef struct {
+	Atom	name;
+	unsigned long card32;
+} XFontProp;
+.EE
+.LP
+.IN "XChar2b" "" "@DEF@"
+.EX
+typedef struct {	/\&* normal 16 bit characters are two bytes */
+    unsigned char byte1;
+    unsigned char byte2;
+} XChar2b;
+.EE
+.LP
+.IN "XFontStruct" "" "@DEF@"
+.EX
+typedef struct {
+	XExtData *ext_data;	/\&* hook for extension to hang data */
+	Font fid;	/\&* Font id for this font */
+	unsigned direction;	/\&* hint about the direction font is painted */
+	unsigned min_char_or_byte2;	/\&* first character */
+	unsigned max_char_or_byte2;	/\&* last character */
+	unsigned min_byte1;	/\&* first row that exists */
+	unsigned max_byte1;	/\&* last row that exists */
+	Bool all_chars_exist;	/\&* flag if all characters have nonzero size */
+	unsigned default_char;	/\&* char to print for undefined character */
+	int n_properties;	/\&* how many properties there are */
+	XFontProp *properties;	/\&* pointer to array of additional properties */
+	XCharStruct min_bounds;	/\&* minimum bounds over all existing char */
+	XCharStruct max_bounds;	/\&* maximum bounds over all existing char */
+	XCharStruct *per_char;	/\&* first_char to last_char information */
+	int ascent;	/\&* logical extent above baseline for spacing */
+	int descent;	/\&* logical decent below baseline for spacing */
+} XFontStruct;
+.EE
+.LP
+X supports single byte/character, two bytes/character matrix,
+and 16-bit character text operations.
+Note that any of these forms can be used with a font, but a
+single byte/character text request can only specify a single byte
+(that is, the first row of a 2-byte font).
+You should view 2-byte fonts as a two-dimensional matrix of defined
+characters: byte1 specifies the range of defined rows and
+byte2 defines the range of defined columns of the font.
+Single byte/character fonts have one row defined, and the byte2 range
+specified in the structure defines a range of characters.
+.LP
+The bounding box of a character is defined by the 
+.ZN XCharStruct 
+of that character.
+When characters are absent from a font,
+the default_char is used.
+When fonts have all characters of the same size,
+only the information in the
+.ZN XFontStruct
+min and max bounds are used.
+.LP
+The members of the 
+.ZN XFontStruct 
+have the following semantics:
+.IP \(bu 5
+The direction member can be either 
+.ZN FontLeftToRight 
+or 
+.ZN FontRightToLeft . 
+It is just a hint as to whether most 
+.ZN XCharStruct 
+elements 
+have a positive 
+.Pn ( FontLeftToRight ) 
+or a negative 
+.Pn ( FontRightToLeft )
+character width 
+metric.
+The core protocol defines no support for vertical text.
+.IP \(bu 5
+If the min_byte1 and max_byte1 members are both zero, min_char_or_byte2
+specifies the linear character index corresponding to the first element
+of the per_char array, and max_char_or_byte2 specifies the linear character
+index of the last element.
+.IP
+If either min_byte1 or max_byte1 are nonzero, both
+min_char_or_byte2 and max_char_or_byte2 are less than 256, 
+and the 2-byte character index values corresponding to the
+per_char array element N (counting from 0) are:
+.IP
+.EX
+	byte1 = N/D + min_byte1
+	byte2 = N\\D + min_char_or_byte2
+.EE
+where:
+.EX
+        D = max_char_or_byte2 \- min_char_or_byte2 + 1
+        / = integer division
+        \e\e = integer modulus
+.EE
+.IP \(bu 5
+If the per_char pointer is NULL, 
+all glyphs between the first and last character indexes
+inclusive have the same information,
+as given by both min_bounds and max_bounds.
+.IP \(bu 5
+If all_chars_exist is 
+.ZN True ,
+all characters in the per_char array have nonzero bounding boxes.
+.IP \(bu 5
+The default_char member specifies the character that will be used when an
+undefined or nonexistent character is printed.  
+The default_char is a 16-bit character (not a 2-byte character).
+For a font using 2-byte matrix format, 
+the default_char has byte1 in the most-significant byte
+and byte2 in the least significant byte.
+If the default_char itself specifies an undefined or nonexistent character, 
+no printing is performed for an undefined or nonexistent character.
+.IP \(bu 5
+The min_bounds and max_bounds members contain the most extreme values of
+each individual 
+.ZN XCharStruct 
+component over all elements of this array
+(and ignore nonexistent characters).
+The bounding box of the font (the smallest
+rectangle enclosing the shape obtained by superimposing all of the
+characters at the same origin [x,y]) has its upper-left coordinate at:
+.Ds
+	[x + min_bounds.lbearing, y \- max_bounds.ascent]
+.De
+.IP
+Its width is:
+.Ds
+	max_bounds.rbearing \- min_bounds.lbearing
+.De
+.IP
+Its height is:
+.Ds
+	max_bounds.ascent + max_bounds.descent
+.De
+.IP \(bu 5
+The ascent member is the logical extent of the font above the baseline that is
+used for determining line spacing.
+Specific characters may extend beyond
+this.
+.IP \(bu 5
+The descent member is the logical extent of the font at or below the
+baseline that is used for determining line spacing.
+Specific characters may extend beyond this.
+.IP \(bu 5
+If the baseline is at Y-coordinate y,
+the logical extent of the font is inclusive between the Y-coordinate 
+values (y \- font.ascent) and (y + font.descent \- 1).
+Typically,
+the minimum interline spacing between rows of text is given
+by ascent + descent.
+.LP
+For a character origin at [x,y],
+the bounding box of a character (that is, 
+the smallest rectangle that encloses the character's shape)
+described in terms of 
+.ZN XCharStruct 
+components is a rectangle with its upper-left corner at:
+.LP
+.Ds
+[x + lbearing, y \- ascent]
+.De
+.LP
+Its width is:
+.LP
+.Ds
+rbearing \- lbearing
+.De
+.LP
+Its height is:
+.LP
+.Ds
+ascent + descent
+.De
+.LP
+The origin for the next character is defined to be:
+.LP
+.Ds
+[x + width, y]
+.De
+.LP
+The lbearing member defines the extent of the left edge of the character ink
+from the origin.
+The rbearing member defines the extent of the right edge of the character ink
+from the origin.
+The ascent member defines the extent of the top edge of the character ink
+from the origin.
+The descent member defines the extent of the bottom edge of the character ink
+from the origin.
+The width member defines the logical width of the character.
+.SH DIAGNOSTICS
+.TP 1i
+.ZN BadAlloc
+The server failed to allocate the requested resource or server memory.
+.TP 1i
+.ZN BadFont
+A value for a Font or GContext argument does not name a defined Font.
+.TP 1i
+.ZN BadName
+A font or color of the specified name does not exist.
+.SH "SEE ALSO"
+XCreateGC(__libmansuffix__),
+XListFonts(__libmansuffix__),
+XSetFontPath(__libmansuffix__)
+.br
+\fI\*(xL\fP