XContextualDrawing(3)

1XFontsOfFontSet(3)              XLIB FUNCTIONS              XFontsOfFontSet(3)
2
3
4

NAME

6       XFontsOfFontSet,  XBaseFontNameListOfFontSet,  XLocaleOfFontSet,  XCon‐
7       textDependentDrawing, XContextualDrawing,  XDirectionalDependentDrawing
8       - obtain fontset information
9

SYNTAX

11       int        XFontsOfFontSet(XFontSet        font_set,        XFontStruct
12              ***font_struct_list_return, char ***font_name_list_return);
13
14       char *XBaseFontNameListOfFontSet(XFontSet font_set);
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16       char *XLocaleOfFontSet(XFontSet font_set);
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18       Bool XContextDependentDrawing(XFontSet font_set);
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20       Bool XContextualDrawing(XFontSet font_set);
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22       Bool XDirectionalDependentDrawing(XFontSet font_set);
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ARGUMENTS

25       font_set  Specifies the font set.
26
27       font_name_list_return
28                 Returns the list of font names.
29
30       font_struct_list_return
31                 Returns the list of font structs.
32

DESCRIPTION

34       The XFontsOfFontSet function returns a list of one or more XFontStructs
35       and  font  names  for  the fonts used by the Xmb and Xwc layers for the
36       given font set.  A list of pointers to the  XFontStruct  structures  is
37       returned to font_struct_list_return.  A list of pointers to null-termi‐
38       nated, fully specified font name strings in the locale of the font  set
39       is  returned to font_name_list_return.  The font_name_list order corre‐
40       sponds to the font_struct_list order.  The number of XFontStruct struc‐
41       tures and font names is returned as the value of the function.
42
43       Because  it  is  not  guaranteed  that a given character will be imaged
44       using a single font glyph, there is no provision for mapping a  charac‐
45       ter  or  default  string  to the font properties, font ID, or direction
46       hint for the font  for  the  character.   The  client  may  access  the
47       XFontStruct  list to obtain these values for all the fonts currently in
48       use.
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50       Xlib does not guarantee that fonts are loaded from the  server  at  the
51       creation  of  an XFontSet.  Xlib may choose to cache font data, loading
52       it only as needed to draw text or compute text dimensions.   Therefore,
53       existence  of the per_char metrics in the XFontStruct structures in the
54       XFontStructSet is undefined.  Also, note that  all  properties  in  the
55       XFontStruct structures are in the STRING encoding.
56
57       The XFontStruct and font name lists are owned by Xlib and should not be
58       modified or freed by the client.  They will  be  freed  by  a  call  to
59       XFreeFontSet with the associated XFontSet.  Until freed, their contents
60       will not be modified by Xlib.
61
62       The XBaseFontNameListOfFontSet function returns the original base  font
63       name  list  supplied  by  the  client when the XFontSet was created.  A
64       null-terminated string containing a list of comma-separated font  names
65       is returned as the value of the function.  White space may appear imme‐
66       diately on either side of separating commas.
67
68       If XCreateFontSet obtained an XLFD name from the  font  properties  for
69       the  font  specified  by a non-XLFD base name, the XBaseFontNameListOf‐
70       FontSet function will return the XLFD name instead of the non-XLFD base
71       name.
72
73       The  base font name list is owned by Xlib and should not be modified or
74       freed by the client.  It will be freed by a call to  XFreeFontSet  with
75       the  associated  XFontSet.  Until freed, its contents will not be modi‐
76       fied by Xlib.
77
78       The XLocaleOfFontSet function returns the name of the locale  bound  to
79       the specified XFontSet, as a null-terminated string.
80
81       The returned locale name string is owned by Xlib and should not be mod‐
82       ified or freed by the client.  It may be freed  by  a  call  to  XFree‐
83       FontSet with the associated XFontSet.  Until freed, it will not be mod‐
84       ified by Xlib.
85
86       The XContextDependentDrawing function returns True if the drawing func‐
87       tions  implement implicit text directionality or if text drawn with the
88       font_set might include context-dependent drawing; otherwise, it returns
89       False.
90
91       The  XContextualDrawing  function  returns  True if text drawn with the
92       font set might include context-dependent drawing; otherwise, it returns
93       False.
94
95       The  XDirectionalDependentDrawing  function returns True if the drawing
96       functions implement implicit text directionality; otherwise, it returns
97       False.
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NAME

SYNTAX

ARGUMENTS

DESCRIPTION

SEE ALSO