303 lines
7.5 KiB
Plaintext
303 lines
7.5 KiB
Plaintext
.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.\".ps \\n(PS
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.\"
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.\" choose appropriate monospace font
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..
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.ny0
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.TH XTextExtents 3X11 "Release 5" "X Version 11" "XLIB FUNCTIONS"
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.SH NAME
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XTextExtents, XTextExtents16, XQueryTextExtents, XQueryTextExtents16 \- compute or query text extents
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.SH SYNTAX
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XTextExtents\^(\^\fIfont_struct\fP\^, \fIstring\fP\^, \fInchars\fP\^, \
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\fIdirection_return\fP, \fIfont_ascent_return\fP,
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.br
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\fIfont_descent_return\fP, \fIoverall_return\fP\^)
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.br
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XFontStruct *\fIfont_struct\fP\^;
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.br
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char *\fIstring\fP\^;
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.br
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int \fInchars\fP\^;
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.br
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int *\fIdirection_return\fP\^;
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.br
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int *\fIfont_ascent_return\fP, *\fIfont_descent_return\fP\^;
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.br
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XCharStruct *\fIoverall_return\fP\^;
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.LP
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XTextExtents16\^(\^\fIfont_struct\fP\^, \fIstring\fP\^, \fInchars\fP\^, \
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\fIdirection_return\fP, \fIfont_ascent_return\fP,
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.br
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\fIfont_descent_return\fP, \fIoverall_return\fP\^)
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.br
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XFontStruct *\fIfont_struct\fP\^;
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.br
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XChar2b *\fIstring\fP\^;
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.br
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int \fInchars\fP\^;
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.br
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int *\fIdirection_return\fP\^;
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.br
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int *\fIfont_ascent_return\fP, *\fIfont_descent_return\fP\^;
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.br
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XCharStruct *\fIoverall_return\fP\^;
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.LP
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XQueryTextExtents\^(\^\fIdisplay\fP, \fIfont_ID\fP, \fIstring\fP, \
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\fInchars\fP, \fIdirection_return\fP, \fIfont_ascent_return\fP,
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.br
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\fIfont_descent_return\fP, \fIoverall_return\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.br
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XID \fIfont_ID\fP\^;
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.br
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char *\fIstring\fP\^;
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.br
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int \fInchars\fP\^;
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.br
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int *\fIdirection_return\fP\^;
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.br
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int *\fIfont_ascent_return\fP, *\fIfont_descent_return\fP\^;
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.br
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XCharStruct *\fIoverall_return\fP\^;
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.LP
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XQueryTextExtents16\^(\^\fIdisplay\fP, \fIfont_ID\fP, \fIstring\fP, \
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\fInchars\fP, \fIdirection_return\fP, \fIfont_ascent_return\fP,
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.br
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\fIfont_descent_return\fP, \fIoverall_return\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.br
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XID \fIfont_ID\fP\^;
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.br
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XChar2b *\fIstring\fP\^;
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.br
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int \fInchars\fP\^;
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.br
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int *\fIdirection_return\fP\^;
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.br
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int *\fIfont_ascent_return\fP, *\fIfont_descent_return\fP\^;
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.br
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XCharStruct *\fIoverall_return\fP\^;
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.SH ARGUMENTS
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.IP \fIdirection_return\fP 1i
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Returns the value of the direction hint
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.Pn ( FontLeftToRight
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or
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.ZN FontRightToLeft ).
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.\" $Header: display.a,v 1.1 88/02/26 10:26:29 mento Exp $
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.IP \fIfont_ID\fP 1i
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Specifies either the font ID or the
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.ZN GContext
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ID that contains the font.
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.IP \fIfont_ascent_return\fP 1i
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Returns the font ascent.
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.IP \fIfont_descent_return\fP 1i
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Returns the font descent.
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.IP \fIfont_struct\fP 1i
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Specifies the
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.ZN XFontStruct
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structure.
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.IP \fInchars\fP 1i
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Specifies the number of characters in the character string.
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.\" $Header: string.a,v 1.1 88/02/26 10:31:32 mento Exp $
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.IP \fIstring\fP 1i
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Specifies the character string.
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.IP \fIoverall_return\fP 1i
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Returns the overall size in the specified
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.ZN XCharStruct
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structure.
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.SH DESCRIPTION
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.\" $Header: XTextExt.d,v 1.2 88/06/11 07:54:02 mento Exp $
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The
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.ZN XTextExtents
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and
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.ZN XTextExtents16
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functions
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perform the size computation locally and, thereby,
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avoid the round-trip overhead of
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.ZN XQueryTextExtents
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and
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.ZN XQueryTextExtents16 .
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Both functions return an
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.ZN XCharStruct
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structure, whose members are set to the values as follows.
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.LP
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The ascent member is set to the maximum of the ascent metrics of all
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characters in the string.
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The descent member is set to the maximum of the descent metrics.
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The width member is set to the sum of the character-width metrics of all
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characters in the string.
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For each character in the string,
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let W be the sum of the character-width metrics of all characters preceding
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it in the string.
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Let L be the left-side-bearing metric of the character plus W.
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Let R be the right-side-bearing metric of the character plus W.
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The lbearing member is set to the minimum L of all characters in the string.
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The rbearing member is set to the maximum R.
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.LP
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For fonts defined with linear indexing rather than 2-byte matrix indexing,
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each
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.ZN XChar2b
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structure is interpreted as a 16-bit number with byte1 as the
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most-significant byte.
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If the font has no defined default character,
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undefined characters in the string are taken to have all zero metrics.
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.LP
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.\" $Header: XQryTExts.d,v 1.2 88/06/11 07:52:33 mento Exp $
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The
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.ZN XQueryTextExtents
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and
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.ZN XQueryTextExtents16
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functions return the bounding box of the specified 8-bit and 16-bit
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character string in the specified font or the font contained in the
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specified GC.
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These functions query the X server and, therefore, suffer the round-trip
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overhead that is avoided by
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.ZN XTextExtents
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and
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.ZN XTextExtents16 .
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Both functions return a
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.ZN XCharStruct
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structure, whose members are set to the values as follows.
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.LP
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The ascent member is set to the maximum of the ascent metrics
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of all characters in the string.
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The descent member is set to the maximum of the descent metrics.
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The width member is set to the sum of the character-width metrics
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of all characters in the string.
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For each character in the string,
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let W be the sum of the character-width metrics of all characters preceding
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it in the string.
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Let L be the left-side-bearing metric of the character plus W.
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Let R be the right-side-bearing metric of the character plus W.
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The lbearing member is set to the minimum L of all characters in the string.
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The rbearing member is set to the maximum R.
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.LP
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For fonts defined with linear indexing rather than 2-byte matrix indexing,
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each
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.ZN XChar2b
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structure is interpreted as a 16-bit number with byte1 as the
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most-significant byte.
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If the font has no defined default character,
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undefined characters in the string are taken to have all zero metrics.
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.LP
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Characters with all zero metrics are ignored.
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If the font has no defined default_char,
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the undefined characters in the string are also ignored.
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.LP
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.ZN XQueryTextExtents
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and
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.ZN XQueryTextExtents16
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can generate
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.ZN BadFont
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and
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.ZN BadGC
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errors.
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.SH DIAGNOSTICS
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.\" $Header: badfont.e,v 1.2 87/09/09 18:08:11 mento Exp $
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.TP 1i
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.ZN BadFont
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A value for a Font or GContext argument does not name a defined Font.
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.\" $Header: badgc.e,v 1.1 87/09/04 08:23:02 mento Locked $
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.TP 1i
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.ZN BadGC
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A value for a GContext argument does not name a defined GContext.
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.SH "SEE ALSO"
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XLoadFont(3X11),
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XTextWidth(3X11)
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.br
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\fI\*(xL\fP
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