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[emacs.git] / src / x-list-font.c
blob861a61dac818857d3a477d99253951d12ef2058d
1 DEFUN ("x-list-fonts", Fx_list_fonts, Sx_list_fonts, 1, 5, 0,
2 "Return a list of the names of available fonts matching PATTERN.\n\
3 If optional arguments FACE and FRAME are specified, return only fonts\n\
4 the same size as FACE on FRAME.\n\
5 PATTERN is a string, perhaps with wildcard characters;\n\
6 the * character matches any substring, and\n\
7 the ? character matches any single character.\n\
8 PATTERN is case-insensitive.\n\
9 FACE is a face name--a symbol.\n\
10 \n\
11 The return value is a list of strings, suitable as arguments to\n\
12 set-face-font.\n\
13 \n\
14 Fonts Emacs can't use (i.e. proportional fonts) may or may not be excluded\n\
15 even if they match PATTERN and FACE.\n\
16 The optional fourth argument MAXIMUM sets a limit on how many\n\
17 fonts to match. The first MAXIMUM fonts are reported.\n\
18 The optional fifth argument WIDTH, if specified, is a number of columns\n\
19 occupied by a character of a font. In that case, return only fonts\n\
20 the WIDTH times as wide as FACE on FRAME.")
21 (pattern, face, frame, maximum, width)
22 Lisp_Object pattern, face, frame, maximum, width;
24 FRAME_PTR f;
25 int size, cols;
26 int maxnames;
28 (*check_window_system_func) ();
29 CHECK_STRING (pattern, 0);
30 if (!NILP (face))
31 CHECK_SYMBOL (face, 1);
33 if (NILP (maximum))
34 maxnames = 2000;
35 else
37 CHECK_NATNUM (maximum, 0);
38 maxnames = XINT (maximum);
41 if (!NILP (width))
42 CHECK_NUMBER (width, 4);
44 /* We can't simply call check_x_frame because this function may be
45 called before any frame is created. */
46 if (NILP (frame))
47 f = selected_frame;
48 else
50 CHECK_LIVE_FRAME (frame, 0);
51 f = XFRAME (frame);
53 if (! FRAME_WINDOW_P (f))
55 /* Perhaps we have not yet created any frame. */
56 f = NULL;
57 face = Qnil;
60 /* Determine the width standard for comparison with the fonts we find. */
62 if (NILP (face))
63 size = 0;
64 else
66 int face_id;
68 face_id = face_name_id_number (f, face);
70 if (face_id < 0 || face_id >= FRAME_N_PARAM_FACES (f)
71 || FRAME_PARAM_FACES (f) [face_id] == 0
72 || FRAME_PARAM_FACES (f) [face_id]->font == (XFontStruct *) (~0))
73 size = FONT_WIDTH (FRAME_FONT (f));
74 else
75 size = FONT_WIDTH (FRAME_PARAM_FACES (f) [face_id]->font);
77 if (!NILP (width))
78 size *= XINT (width);
82 Lisp_Object args[2];
84 args[0] = (*list_fonts_func) (f, pattern, size, maxnames);
85 if (f == NULL)
86 /* We don't have to check fontsets. */
87 return args[0];
88 args[1] = list_fontsets (f, pattern, size);
89 return Fnconc (2, args);