NAME
XFontsOfFontSet, XBaseFontNameListOfFontSet, XLocaleOfFontSet,
XContextDependentDrawing, XContextualDrawing, XDirectionalDependentDrawing -
obtain fontset information
SYNTAX
int
XFontsOfFontSet(XFontSet font_set, XFontStruct ***
font_struct_list_return, char *** font_name_list_return);
char
*XBaseFontNameListOfFontSet(XFontSet font_set);
char
*XLocaleOfFontSet(XFontSet font_set);
Bool
XContextDependentDrawing(XFontSet font_set);
Bool
XContextualDrawing(XFontSet font_set);
Bool
XDirectionalDependentDrawing(XFontSet font_set);
ARGUMENTS
- font_set
- Specifies the font set.
- font_name_list_return
- Returns the list of font names.
- font_struct_list_return
- Returns the list of font structs.
DESCRIPTION
The
XFontsOfFontSet function returns a list of one or more
XFontStructs and font names for the fonts used by the Xmb and Xwc
layers for the given font set. A list of pointers to the
XFontStruct
structures is returned to font_struct_list_return. A list of pointers to
null-terminated, fully specified font name strings in the locale of the font
set is returned to font_name_list_return. The font_name_list order corresponds
to the font_struct_list order. The number of
XFontStruct structures and
font names is returned as the value of the function.
Because it is not guaranteed that a given character will be imaged using a
single font glyph, there is no provision for mapping a character or default
string to the font properties, font ID, or direction hint for the font for the
character. The client may access the
XFontStruct list to obtain these
values for all the fonts currently in use.
Xlib does not guarantee that fonts are loaded from the server at the creation of
an
XFontSet. Xlib may choose to cache font data, loading it only as
needed to draw text or compute text dimensions. Therefore, existence of the
per_char metrics in the
XFontStruct structures in the
XFontStructSet is undefined. Also, note that all properties in the
XFontStruct structures are in the STRING encoding.
The
XFontStruct and font name lists are owned by Xlib and should not be
modified or freed by the client. They will be freed by a call to
XFreeFontSet with the associated
XFontSet. Until freed, their
contents will not be modified by Xlib.
The
XBaseFontNameListOfFontSet function returns the original base font
name list supplied by the client when the
XFontSet was created. A
null-terminated string containing a list of comma-separated font names is
returned as the value of the function. White space may appear immediately on
either side of separating commas.
If
XCreateFontSet obtained an XLFD name from the font properties for the
font specified by a non-XLFD base name, the
XBaseFontNameListOfFontSet
function will return the XLFD name instead of the non-XLFD base name.
The base font name list is owned by Xlib and should not be modified or freed by
the client. It will be freed by a call to
XFreeFontSet with the
associated
XFontSet. Until freed, its contents will not be modified by
Xlib.
The
XLocaleOfFontSet function returns the name of the locale bound to the
specified
XFontSet, as a null-terminated string.
The returned locale name string is owned by Xlib and should not be modified or
freed by the client. It may be freed by a call to
XFreeFontSet with the
associated
XFontSet. Until freed, it will not be modified by Xlib.
The
XContextDependentDrawing function returns
True if the drawing
functions implement implicit text directionality or if text drawn with the
font_set might include context-dependent drawing; otherwise, it returns
False.
The
XContextualDrawing function returns
True if text drawn with
the font set might include context-dependent drawing; otherwise, it returns
False.
The
XDirectionalDependentDrawing function returns
True if the
drawing functions implement implicit text directionality; otherwise, it
returns
False.
SEE ALSO
XCreateFontSet(3), XCreateOM(3), XCreateOC(3), XExtentsOfFontSet(3),
XFontSetExtents(3)
Xlib - C Language X Interface