XmbTextPerCharExtents(XS)

Syntax

   Status XmbTextPerCharExtents (font_set, string, num_bytes, ink_array_return,
                                 logical_array_return, array_size,
                                 num_chars_return, overall_return)
         XFontSet font_set;
         char *string;
         int num_bytes;
         XRectangle *ink_array_return;
         XRectangle *logical_array_return;
         int array_size;
         int *num_chars_return;
         XRectangle *overall_ink_return;
         XRectangle *overall_logical_return;
   

   Status XwcTextPerCharExtents (font_set, string, num_wchars,
                                 ink_array_return, logical_array_return,
                                 array_size, num_chars_return, overall_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

array_size

Specifies the size of ink_array_return and logical_array_return. Note that the caller must pass in arrays of this size.

font_set

Specifies the font set.

ink_array_return

Returns the ink dimensions for each character.

logical_array_return

Returns the logical dimensions for each character.

num_bytes

Specifies the number of bytes in the string argument.

num_chars_return

Returns the number characters in the string argument.

num_wchars

Specifies the number of 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.

string

Specifies the character string.

Description

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 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 XCreateFontSet, 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 supplied text, the functions return zero and num_chars_return is set to the number of rectangles required. Otherwise, the routines return a non-zero value.

If the overall_ink_return or overall_logical_return argument is non-NULL, XmbTextPerCharExtents and XwcTextPerCharExtents return the maximum extent of the string's metrics to overall_ink_return or overall_logical_return, as returned by XmbTextExtents or XwcTextExtents.

See also