XwcTextPerCharExtents()XwcTextPerCharExtents()NameXwcTextPerCharExtents – obtain per-character measurements of an inter‐
nationalized wide-character text string.
Synopsis
Status XwcTextPerCharExtents(font_set, string, num_wchars,
ink_array_return, logical_array_return, array_size, num_chars_return,
overall_ink_return, overall_logical_return)
XFontSet font_set;
wchar_t *string;
int num_wchars;
XRectangle *ink_array_return;
XRectangle *logical_array_return;
int array_size;
int *num_chars_return;
XRectangle *overall_ink_return;
XRectangle *overall_logical_return;
Arguments
font_set Specifies the font set.
string Specifies the character string.
num_wchars
Specifies the number of characters in the string argument.
ink_array_return
Returns the ink dimensions for each character.
logical_array_return
Returns the logical dimensions for each character.
array_size
Specifies the size of ink_array_return and the size of
logical_array_return. The caller must pass in arrays of this
size.
num_chars_return
Returns the number characters in the string argument.
overall_ink_return
Returns the overall ink extents of the entire string.
overall_logical_return
Returns the overall logical extents of the entire string.
Returns
Zero on failure, non-zero on success.
Availability
Release 5 and later.
DescriptionXwcTextPerCharExtents() returns the text dimensions of each character
of the specified text, using the fonts loaded for the specified font
set. Each element of ink_array_return and logical_array_return is set
to the corresponding character's drawn metrics, relative to the drawing
origin of the string. The number of elements of ink_array_return and
logical_array_return that have been set is returned in
num_chars_return.
Each element of ink_array_return is set to the bounding box of the cor‐
responding character's drawn foreground color. Each element of
logical_array_return is set to the bounding box which provides minimum
spacing to other graphical features for the corresponding character.
Other graphical features should not intersect any of the
logical_array_return rectangles.
Note that an 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 XRectangles of those characters are the same.
When the XFontSet has missing charsets, metrics for each unavailable
character are taken from the default string returned by XCreate‐
FontSet(), so that the metrics represent the text as it will actually
be drawn. The behavior for an invalid codepoint is undefined.
If the array_size is too small for the number of characters in the sup‐
plied text, the function returns zero and num_chars_return is set to
the number of rectangles required. Otherwise, it returns a non-zero
value.
If the overall_ink_return or overall_logical_return argument is non-
NULL, XwcTextPerCharExtents() returns the maximum extent of the
string's metrics to overall_ink_return or overall_logical_return, as is
done by XwcTextExtents().
Structures
typedef struct {
short x, y;
unsigned short width, height;
} XRectangle;
See AlsoXwcTextEscapement(), XwcTextExtents(), XmbTextPerCharExtents().
Xlib - Internationalized Text XwcTextPerCharExtents()
