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.\" 

.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

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.ny0

.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(__libmansuffix__),

XmbTextExtents(__libmansuffix__)

\fI\*(xL\fP