XmbTextExtents(3) XLIB FUNCTIONS XmbTextExtents(3)
NAME
XmbTextExtents, XwcTextExtents, Xutf8TextExtents - compute text extents
SYNTAX
int XmbTextExtents(XFontSet font_set, _Xconst char *string, int
num_bytes, XRectangle *overall_ink_return, XRectangle *over-
all_logical_return);
int XwcTextExtents(XFontSet font_set, _Xconst wchar_t *string, int
num_wchars, XRectangle *overall_ink_return, XRectangle *over-
all_logical_return);
int Xutf8TextExtents(XFontSet font_set, _Xconst char *string, int
num_bytes, XRectangle *overall_ink_return, XRectangle *over-
all_logical_return);
ARGUMENTS
font_set Specifies the font set.
num_bytes Specifies the number of bytes in the string argument.
num_wchars
Specifies the number of characters in the string argument.
overall_ink_return
Returns the overall ink dimensions.
overall_logical_return
Returns the overall logical dimensions.
string Specifies the character string.
DESCRIPTION
The XmbTextExtents, XwcTextExtents and Xutf8TextExtents functions set
the components of the specified overall_ink_return and overall_logi-
cal_return arguments to the overall bounding box of the string's image
and a logical bounding box for spacing purposes, respectively. They re-
turn the value returned by XmbTextEscapement, XwcTextEscapement or
Xutf8TextEscapement. These metrics are relative to the drawing origin
of the string, using the fonts loaded for the specified font set.
If the overall_ink_return argument is non-NULL, it is set to the bound-
ing box of the string's character ink. The overall_ink_return for a
nondescending, horizontally drawn Latin character is conventionally en-
tirely above the baseline; that is, overall_ink_return.height <= -over-
all_ink_return.y. The overall_ink_return for a nonkerned character is
entirely at, and to the right of, the origin; that is, overall_ink_re-
turn.x >= 0. A character consisting of a single pixel at the origin
would set overall_ink_return fields y = 0, x = 0, width = 1, and height
= 1.
If the overall_logical_return argument is non-NULL, it is set to the
bounding box that provides minimum spacing to other graphical features
for the string. Other graphical features, for example, a border sur-
rounding the text, should not intersect this rectangle.
When the XFontSet has missing charsets, metrics for each unavailable
character are taken from the default string returned by XCreateFontSet
so that the metrics represent the text as it will actually be drawn.
The behavior for an invalid codepoint is undefined.
The function Xutf8TextExtents is an extension introduced by The XFree86
Project, Inc., in their 4.0.2 release. Its presence is indicated by the
macro X_HAVE_UTF8_STRING.
SEE ALSO
XmbTextEscapement(3), XmbTextPerCharExtents(3) Xlib - C Language X In-
terface
X Version 11 libX11 1.8.12 XmbTextExtents(3)
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