}
}
-/* Return a description of the font at POSITION in the current buffer.
- If the 2nd optional arg CH is non-nil, it is a character to check
- the font instead of the character at POSITION.
-
- For a graphical display, return a cons (FONT-OBJECT . GLYPH-CODE).
- FONT-OBJECT is the font for the character at POSITION in the current
- buffer. This is computed from all the text properties and overlays
- that apply to POSITION. POSITION may be nil, in which case,
- FONT-SPEC is the font for displaying the character CH with the
- default face. GLYPH-CODE is the glyph code in the font to use for
- the character.
-
- For a text terminal, return a nonnegative integer glyph code for
- the character, or a negative integer if the character is not
- displayable. Terminal glyph codes are system-dependent integers
- that represent displayable characters: for example, on a Linux x86
- console they represent VGA code points.
-
- It returns nil in the following cases:
-
- (1) The window system doesn't have a font for the character (thus
- it is displayed by an empty box).
-
- (2) The character code is invalid.
-
- (3) If POSITION is not nil, and the current buffer is not displayed
- in any window.
-
- (4) For a text terminal, the terminal does not report glyph codes.
-
- In addition, the returned font name may not take into account of
- such redisplay engine hooks as what used in jit-lock-mode if
- POSITION is currently not visible. */
-
-
-DEFUN ("internal-char-font", Finternal_char_font, Sinternal_char_font, 1, 2, 0,
- doc: /* For internal use only. */)
- (Lisp_Object position, Lisp_Object ch)
-{
- ptrdiff_t pos, pos_byte, dummy;
- int face_id;
- int c;
- struct frame *f;
- struct face *face;
-
- if (NILP (position))
- {
- CHECK_CHARACTER (ch);
- c = XINT (ch);
- f = XFRAME (selected_frame);
- face_id = lookup_basic_face (f, DEFAULT_FACE_ID);
- pos = -1;
- }
- else
- {
- Lisp_Object window;
- struct window *w;
-
- CHECK_NUMBER_COERCE_MARKER (position);
- if (! (BEGV <= XINT (position) && XINT (position) < ZV))
- args_out_of_range_3 (position, make_number (BEGV), make_number (ZV));
- pos = XINT (position);
- pos_byte = CHAR_TO_BYTE (pos);
- if (NILP (ch))
- c = FETCH_CHAR (pos_byte);
- else
- {
- CHECK_NATNUM (ch);
- c = XINT (ch);
- }
- window = Fget_buffer_window (Fcurrent_buffer (), Qnil);
- if (NILP (window))
- return Qnil;
- w = XWINDOW (window);
- f = XFRAME (w->frame);
- face_id = face_at_buffer_position (w, pos, &dummy,
- pos + 100, false, -1);
- }
- if (! CHAR_VALID_P (c))
- return Qnil;
- if (!FRAME_WINDOW_P (f))
- return terminal_glyph_code (FRAME_TERMINAL (f), c);
- /* We need the basic faces to be valid below, so recompute them if
- some code just happened to clear the face cache. */
- if (FRAME_FACE_CACHE (f)->used == 0)
- recompute_basic_faces (f);
- face_id = FACE_FOR_CHAR (f, FACE_FROM_ID (f, face_id), c, pos, Qnil);
- face = FACE_FROM_ID (f, face_id);
- if (face->font)
- {
- unsigned code = face->font->driver->encode_char (face->font, c);
- Lisp_Object font_object;
-
- if (code == FONT_INVALID_CODE)
- return Qnil;
- XSETFONT (font_object, face->font);
- return Fcons (font_object, INTEGER_TO_CONS (code));
- }
- return Qnil;
-}
-
DEFUN ("fontset-info", Ffontset_info, Sfontset_info, 1, 2, 0,
doc: /* Return information about a fontset FONTSET on frame FRAME.
defsubr (&Squery_fontset);
defsubr (&Snew_fontset);
defsubr (&Sset_fontset_font);
- defsubr (&Sinternal_char_font);
defsubr (&Sfontset_info);
defsubr (&Sfontset_font);
defsubr (&Sfontset_list);