From b3462c12542a69eeaa3fe90fddfbb15d30c18158 Mon Sep 17 00:00:00 2001 From: marha Date: Mon, 27 Aug 2012 08:17:50 +0200 Subject: xwininfo fontconfig libX11 libXau libXext libxcb mesa pixman xkeyboard-config git update 27 Aug 2012 --- libX11/man/XLoadFont.man | 1017 ++++++++++++++++++++++------------------------ 1 file changed, 478 insertions(+), 539 deletions(-) (limited to 'libX11/man/XLoadFont.man') 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 -- cgit v1.2.3