XmbTextPerCharExtents.man   [plain text]

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.TH XmbTextPerCharExtents __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
.SH NAME
XmbTextPerCharExtents, XwcTextPerCharExtents, Xutf8TextPerCharExtents \- obtain per-character information for a text string
.SH SYNTAX
.HP
Status XmbTextPerCharExtents\^(\^XFontSet \fIfont_set\fP\^, char
*\fIstring\fP\^, int \fInum_bytes\fP\^, XRectangle *\fIink_array_return\fP\^,
XRectangle *\fIlogical_array_return\fP\^, int \fIarray_size\fP\^, int
*\fInum_chars_return\fP\^, XRectangle *\fIoverall_ink_return\fP\^, XRectangle
*\fIoverall_logical_return\fP\^); 
.HP
Status XwcTextPerCharExtents\^(\^XFontSet \fIfont_set\fP\^, wchar_t
*\fIstring\fP\^, int \fInum_wchars\fP\^, XRectangle
*\fIink_array_return\fP\^, XRectangle *\fIlogical_array_return\fP, int
\fIarray_size\fP\^, int *\fInum_chars_return\fP\^, XRectangle
*\fIoverall_ink_return\fP\^, XRectangle *\fIoverall_logical_return\fP\^); 
.HP
Status Xutf8TextPerCharExtents\^(\^XFontSet \fIfont_set\fP\^, char
*\fIstring\fP\^, int \fInum_bytes\fP\^, XRectangle *\fIink_array_return\fP\^,
XRectangle *\fIlogical_array_return\fP\^, int \fIarray_size\fP\^, int
*\fInum_chars_return\fP\^, XRectangle *\fIoverall_ink_return\fP\^, XRectangle
*\fIoverall_logical_return\fP\^);
.SH ARGUMENTS
.IP \fIarray_size\fP 1i
Specifies the size of ink_array_return and logical_array_return.
The caller must pass in arrays of this size.
.IP \fIfont_set\fP 1i
Specifies the font set.
.IP \fIink_array_return\fP 1i
Returns the ink dimensions for each character.
.IP \fIlogical_array_return\fP 1i
Returns the logical dimensions for each character.
.IP \fInum_bytes\fP 1i
Specifies the number of bytes in the string argument.
.IP \fInum_chars_return\fP 1i
Returns the number of characters in the string argument.
.IP \fInum_wchars\fP 1i
Specifies the number of characters in the string argument.
.ds Ov extents of the entire string
.IP \fIoverall_ink_return\fP 1i
Returns the overall ink \*(Ov.
.IP \fIoverall_logical_return\fP 1i
Returns the overall logical \*(Ov.
.IP \fIstring\fP 1i
Specifies the character string.
.SH DESCRIPTION
The
.ZN XmbTextPerCharExtents ,
.ZN XwcTextPerCharExtents
and
.ZN Xutf8TextPerCharExtents
functions return the text dimensions of each character of the specified text,
using the fonts loaded for the specified font set.
Each successive element of ink_array_return and logical_array_return
is set to the successive character's drawn metrics,
relative to the drawing origin of the string and one 
rectangle
for each character in the supplied text string.
The number of elements of ink_array_return and logical_array_return
that have been set is returned to num_chars_return.
.LP
Each element of ink_array_return is set to the bounding box 
of the corresponding character's drawn foreground color.
Each element of logical_array_return is set to the bounding box 
that provides minimum spacing to other graphical features
for the corresponding character.
Other graphical features should not intersect any of the
logical_array_return rectangles.
.LP
Note that an 
.ZN XRectangle
represents the effective drawing dimensions of the character,
regardless of the number of font glyphs that are used to draw
the character or the direction in which the character is drawn.
If multiple characters map to a single character glyph,
the dimensions of all the 
.ZN XRectangles
of those characters are the same.
.LP
When the 
.ZN XFontSet
has missing charsets, metrics for each unavailable
character are taken from the default string returned by 
.ZN XCreateFontSet
so that the metrics represent the text as it will actually be drawn.
The behavior for an invalid codepoint is undefined.
.LP
If the array_size is too small for the number of characters in the
supplied text, the functions return zero
and num_chars_return is set to the number of rectangles required.
Otherwise, the functions return a nonzero value.
.LP
If the overall_ink_return or overall_logical_return argument is non-NULL,
.ZN XmbTextPerCharExtents ,
.ZN XwcTextPerCharExtents
and 
.ZN Xutf8TextPerCharExtents
return the maximum extent of the string's metrics to overall_ink_return
or overall_logical_return, as returned by 
.ZN XmbTextExtents ,
.ZN XwcTextExtents
or 
.ZN Xutf8TextExtents .
.LP
The function
.ZN Xutf8TextPerCharExtents
is an extension introduced by The XFree86 Project, Inc. in their 4.0.2
release. Its presence is
indicated by the macro
.ZN X_HAVE_UTF8_STRING .
.SH "SEE ALSO"
XmbTextEscapement(3X11),
XmbTextExtents(3X11)
\fI\*(xL\fP