font.c 139 KB
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/* font.c -- "Font" primitives.
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   Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
   Copyright (C) 2006, 2007, 2008
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     National Institute of Advanced Industrial Science and Technology (AIST)
     Registration Number H13PRO009

This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
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#ifdef HAVE_M17N_FLT
#include <m17n-flt.h>
#endif
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#include "lisp.h"
#include "buffer.h"
#include "frame.h"
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#include "window.h"
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#include "dispextern.h"
#include "charset.h"
#include "character.h"
#include "composite.h"
#include "fontset.h"
#include "font.h"

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#ifdef HAVE_X_WINDOWS
#include "xterm.h"
#endif /* HAVE_X_WINDOWS */

#ifdef HAVE_NTGUI
#include "w32term.h"
#endif /* HAVE_NTGUI */

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#ifdef HAVE_NS
#include "nsterm.h"
#endif /* HAVE_NS */

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Lisp_Object Qfont_spec, Qfont_entity, Qfont_object;
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#ifdef HAVE_NS
extern Lisp_Object Qfontsize;
#endif
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Lisp_Object Qopentype;

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/* Important character set strings.  */
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Lisp_Object Qascii_0, Qiso8859_1, Qiso10646_1, Qunicode_bmp, Qunicode_sip;
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#ifdef HAVE_NS
#define DEFAULT_ENCODING Qiso10646_1
#else
#define DEFAULT_ENCODING Qiso8859_1
#endif

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/* Special vector of zero length.  This is repeatedly used by (struct
   font_driver *)->list when a specified font is not found. */
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static Lisp_Object null_vector;
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static Lisp_Object Vfont_weight_table, Vfont_slant_table, Vfont_width_table;

/* Vector of Vfont_weight_table, Vfont_slant_table, and Vfont_width_table. */
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static Lisp_Object font_style_table;

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/* Structure used for tables mapping weight, slant, and width numeric
   values and their names.  */

struct table_entry
{
  int numeric;
  /* The first one is a valid name as a face attribute.
     The second one (if any) is a typical name in XLFD field.  */
  char *names[5];
  Lisp_Object *symbols;
};

/* Table of weight numeric values and their names.  This table must be
   sorted by numeric values in ascending order.  */

static struct table_entry weight_table[] =
{
  { 0, { "thin" }},
  { 20, { "ultra-light", "ultralight" }},
  { 40, { "extra-light", "extralight" }},
  { 50, { "light" }},
  { 75, { "semi-light", "semilight", "demilight", "book" }},
  { 100, { "normal", "medium", "regular" }},
  { 180, { "semi-bold", "semibold", "demibold", "demi" }},
  { 200, { "bold" }},
  { 205, { "extra-bold", "extrabold" }},
  { 210, { "ultra-bold", "ultrabold", "black" }}
};

/* Table of slant numeric values and their names.  This table must be
   sorted by numeric values in ascending order.  */

static struct table_entry slant_table[] =
{
  { 0, { "reverse-oblique", "ro" }},
  { 10, { "reverse-italic", "ri" }},
  { 100, { "normal", "r" }},
  { 200, { "italic" ,"i", "ot" }},
  { 210, { "oblique", "o" }}
};

/* Table of width numeric values and their names.  This table must be
   sorted by numeric values in ascending order.  */

static struct table_entry width_table[] =
{
  { 50, { "ultra-condensed", "ultracondensed" }},
  { 63, { "extra-condensed", "extracondensed" }},
  { 75, { "condensed", "compressed", "narrow" }},
  { 87, { "semi-condensed", "semicondensed", "demicondensed" }},
  { 100, { "normal", "medium", "regular" }},
  { 113, { "semi-expanded", "semiexpanded", "demiexpanded" }},
  { 125, { "expanded" }},
  { 150, { "extra-expanded", "extraexpanded" }},
  { 200, { "ultra-expanded", "ultraexpanded", "wide" }}
};

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extern Lisp_Object Qnormal;
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/* Symbols representing keys of normal font properties.  */
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extern Lisp_Object QCtype, QCfamily, QCweight, QCslant, QCwidth;
extern Lisp_Object QCheight, QCsize, QCname;

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Lisp_Object QCfoundry, QCadstyle, QCregistry;
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/* Symbols representing keys of font extra info.  */
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Lisp_Object QCspacing, QCdpi, QCscalable, QCotf, QClang, QCscript, QCavgwidth;
Lisp_Object QCantialias, QCfont_entity, QCfc_unknown_spec;
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/* Symbols representing values of font spacing property.  */
Lisp_Object Qc, Qm, Qp, Qd;
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Lisp_Object Vfont_encoding_alist;

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/* Alist of font registry symbol and the corresponding charsets
   information.  The information is retrieved from
   Vfont_encoding_alist on demand.

   Eash element has the form:
	(REGISTRY . (ENCODING-CHARSET-ID . REPERTORY-CHARSET-ID))
   or
	(REGISTRY . nil)

   In the former form, ENCODING-CHARSET-ID is an ID of a charset that
   encodes a character code to a glyph code of a font, and
   REPERTORY-CHARSET-ID is an ID of a charset that tells if a
   character is supported by a font.

   The latter form means that the information for REGISTRY couldn't be
   retrieved.  */
static Lisp_Object font_charset_alist;

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/* List of all font drivers.  Each font-backend (XXXfont.c) calls
   register_font_driver in syms_of_XXXfont to register its font-driver
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   here.  */
static struct font_driver_list *font_driver_list;

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/* Creaters of font-related Lisp object.  */

Lisp_Object
font_make_spec ()
{
  Lisp_Object font_spec;
  struct font_spec *spec
    = ((struct font_spec *)
       allocate_pseudovector (VECSIZE (struct font_spec),
			      FONT_SPEC_MAX, PVEC_FONT));
  XSETFONT (font_spec, spec);
  return font_spec;
}

Lisp_Object
font_make_entity ()
{
  Lisp_Object font_entity;
  struct font_entity *entity
    = ((struct font_entity *)
       allocate_pseudovector (VECSIZE (struct font_entity),
			      FONT_ENTITY_MAX, PVEC_FONT));
  XSETFONT (font_entity, entity);
  return font_entity;
}

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/* Create a font-object whose structure size is SIZE.  If ENTITY is
   not nil, copy properties from ENTITY to the font-object.  If
   PIXELSIZE is positive, set the `size' property to PIXELSIZE.  */
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Lisp_Object
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font_make_object (size, entity, pixelsize)
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     int size;
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     Lisp_Object entity;
     int pixelsize;
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{
  Lisp_Object font_object;
  struct font *font
    = (struct font *) allocate_pseudovector (size, FONT_OBJECT_MAX, PVEC_FONT);
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  int i;

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  XSETFONT (font_object, font);

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  if (! NILP (entity))
    {
      for (i = 1; i < FONT_SPEC_MAX; i++)
	font->props[i] = AREF (entity, i);
      if (! NILP (AREF (entity, FONT_EXTRA_INDEX)))
	font->props[FONT_EXTRA_INDEX]
	  = Fcopy_sequence (AREF (entity, FONT_EXTRA_INDEX));
    }
  if (size > 0)
    font->props[FONT_SIZE_INDEX] = make_number (pixelsize);
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  return font_object;
}



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static int font_pixel_size P_ ((FRAME_PTR f, Lisp_Object));
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static Lisp_Object font_open_entity P_ ((FRAME_PTR, Lisp_Object, int));
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static Lisp_Object font_matching_entity P_ ((FRAME_PTR, Lisp_Object *,
					     Lisp_Object));
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/* Number of registered font drivers.  */
static int num_font_drivers;

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/* Return a Lispy value of a font property value at STR and LEN bytes.
   If STR is "*", it returns nil.
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   If FORCE_SYMBOL is zero and all characters in STR are digits, it
   returns an integer.  Otherwise, it returns a symbol interned from
   STR.  */
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Lisp_Object
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font_intern_prop (str, len, force_symbol)
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     char *str;
     int len;
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     int force_symbol;
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{
  int i;
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  Lisp_Object tem;
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  Lisp_Object obarray;

  if (len == 1 && *str == '*')
    return Qnil;
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  if (!force_symbol && len >=1 && isdigit (*str))
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    {
      for (i = 1; i < len; i++)
	if (! isdigit (str[i]))
	  break;
      if (i == len)
	return make_number (atoi (str));
    }

  /* The following code is copied from the function intern (in lread.c).  */
  obarray = Vobarray;
  if (!VECTORP (obarray) || XVECTOR (obarray)->size == 0)
    obarray = check_obarray (obarray);
  tem = oblookup (obarray, str, len, len);
  if (SYMBOLP (tem))
    return tem;
  return Fintern (make_unibyte_string (str, len), obarray);
}

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/* Return a pixel size of font-spec SPEC on frame F.  */
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static int
font_pixel_size (f, spec)
     FRAME_PTR f;
     Lisp_Object spec;
{
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#ifdef HAVE_WINDOW_SYSTEM
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  Lisp_Object size = AREF (spec, FONT_SIZE_INDEX);
  double point_size;
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  int dpi, pixel_size;
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  Lisp_Object val;
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  if (INTEGERP (size))
    return XINT (size);
  if (NILP (size))
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    return 0;
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  font_assert (FLOATP (size));
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  point_size = XFLOAT_DATA (size);
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  val = AREF (spec, FONT_DPI_INDEX);
  if (INTEGERP (val))
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    dpi = XINT (val);
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  else
    dpi = f->resy;
  pixel_size = POINT_TO_PIXEL (point_size, dpi);
  return pixel_size;
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#else
  return 1;
#endif
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}

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/* Return a value of PROP's VAL (symbol or integer) to be stored in a
   font vector.  If VAL is not valid (i.e. not registered in
   font_style_table), return -1 if NOERROR is zero, and return a
   proper index if NOERROR is nonzero.  In that case, register VAL in
   font_style_table if VAL is a symbol, and return a closest index if
   VAL is an integer.  */
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int
font_style_to_value (prop, val, noerror)
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     enum font_property_index prop;
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     Lisp_Object val;
     int noerror;
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{
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  Lisp_Object table = AREF (font_style_table, prop - FONT_WEIGHT_INDEX);
  int len = ASIZE (table);
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  int i, j;
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  if (SYMBOLP (val))
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    {
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      unsigned char *s;
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      Lisp_Object args[2], elt;

      /* At first try exact match.  */
      for (i = 0; i < len; i++)
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	for (j = 1; j < ASIZE (AREF (table, i)); j++)
	  if (EQ (val, AREF (AREF (table, i), j)))
	    return ((XINT (AREF (AREF (table, i), 0)) << 8)
		    | (i << 4) | (j - 1));
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      /* Try also with case-folding match.  */
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      s = SDATA (SYMBOL_NAME (val));
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      for (i = 0; i < len; i++)
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	for (j = 1; j < ASIZE (AREF (table, i)); j++)
	  {
	    elt = AREF (AREF (table, i), j);
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	    if (xstrcasecmp (s, SDATA (SYMBOL_NAME (elt))) == 0)
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	      return ((XINT (AREF (AREF (table, i), 0)) << 8)
		      | (i << 4) | (j - 1));
	  }
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      if (! noerror)
	return -1;
      if (len == 255)
	abort ();
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      elt = Fmake_vector (make_number (2), make_number (255));
      ASET (elt, 1, val);
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      args[0] = table;
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      args[1] = Fmake_vector (make_number (1), elt);
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      ASET (font_style_table, prop - FONT_WEIGHT_INDEX, Fvconcat (2, args));
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      return (255 << 8) | (i << 4);
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    }
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  else
    {
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      int i, last_n;
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      int numeric = XINT (val);
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      for (i = 0, last_n = -1; i < len; i++)
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	{
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	  int n = XINT (AREF (AREF (table, i), 0));
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	  if (numeric == n)
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	    return (n << 8) | (i << 4);
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	  if (numeric < n)
	    {
	      if (! noerror)
		return -1;
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	      return ((i == 0 || n - numeric < numeric - last_n)
		      ? (n << 8) | (i << 4): (last_n << 8 | ((i - 1) << 4)));
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	    }
	  last_n = n;
	}
      if (! noerror)
	return -1;
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      return ((last_n << 8) | ((i - 1) << 4));
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    }
}
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Lisp_Object
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font_style_symbolic (font, prop, for_face)
     Lisp_Object font;
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     enum font_property_index prop;
     int for_face;
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{
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  Lisp_Object val = AREF (font, prop);
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  Lisp_Object table, elt;
  int i;
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  if (NILP (val))
    return Qnil;
  table = AREF (font_style_table, prop - FONT_WEIGHT_INDEX);
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  i = XINT (val) & 0xFF;
  font_assert (((i >> 4) & 0xF) < ASIZE (table));
  elt = AREF (table, ((i >> 4) & 0xF));
  font_assert ((i & 0xF) + 1 < ASIZE (elt));
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  return (for_face ? AREF (elt, 1) : AREF (elt, (i & 0xF) + 1));  
}

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extern Lisp_Object Vface_alternative_font_family_alist;

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extern Lisp_Object find_font_encoding P_ ((Lisp_Object));

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/* Return ENCODING or a cons of ENCODING and REPERTORY of the font
   FONTNAME.  ENCODING is a charset symbol that specifies the encoding
   of the font.  REPERTORY is a charset symbol or nil.  */

Lisp_Object
find_font_encoding (fontname)
     Lisp_Object fontname;
{
  Lisp_Object tail, elt;

  for (tail = Vfont_encoding_alist; CONSP (tail); tail = XCDR (tail))
    {
      elt = XCAR (tail);
      if (CONSP (elt)
	  && STRINGP (XCAR (elt))
	  && fast_string_match_ignore_case (XCAR (elt), fontname) >= 0
	  && (SYMBOLP (XCDR (elt))
	      ? CHARSETP (XCDR (elt))
	      : CONSP (XCDR (elt)) && CHARSETP (XCAR (XCDR (elt)))))
	return (XCDR (elt));
    }
  /* We don't know the encoding of this font.  Let's assume `ascii'.  */
  return Qascii;
}

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/* Return encoding charset and repertory charset for REGISTRY in
   ENCODING and REPERTORY correspondingly.  If correct information for
   REGISTRY is available, return 0.  Otherwise return -1.  */

int
font_registry_charsets (registry, encoding, repertory)
     Lisp_Object registry;
     struct charset **encoding, **repertory;
{
  Lisp_Object val;
  int encoding_id, repertory_id;

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  val = Fassoc_string (registry, font_charset_alist, Qt);
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  if (! NILP (val))
    {
      val = XCDR (val);
      if (NILP (val))
	return -1;
      encoding_id = XINT (XCAR (val));
      repertory_id = XINT (XCDR (val));
    }
  else
    {
      val = find_font_encoding (SYMBOL_NAME (registry));
      if (SYMBOLP (val) && CHARSETP (val))
	{
	  encoding_id = repertory_id = XINT (CHARSET_SYMBOL_ID (val));
	}
      else if (CONSP (val))
	{
	  if (! CHARSETP (XCAR (val)))
	    goto invalid_entry;
	  encoding_id = XINT (CHARSET_SYMBOL_ID (XCAR (val)));
	  if (NILP (XCDR (val)))
	    repertory_id = -1;
	  else
	    {
	      if (! CHARSETP (XCDR (val)))
		goto invalid_entry;
	      repertory_id = XINT (CHARSET_SYMBOL_ID (XCDR (val)));
	    }
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	}
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      else
	goto invalid_entry;
      val = Fcons (make_number (encoding_id), make_number (repertory_id));
      font_charset_alist
	= nconc2 (font_charset_alist, Fcons (Fcons (registry, val), Qnil));
    }

  if (encoding)
    *encoding = CHARSET_FROM_ID (encoding_id);
  if (repertory)
    *repertory = repertory_id >= 0 ? CHARSET_FROM_ID (repertory_id) : NULL;
  return 0;

 invalid_entry:
  font_charset_alist
    = nconc2 (font_charset_alist, Fcons (Fcons (registry, Qnil), Qnil));
  return -1;
}

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/* Font property value validaters.  See the comment of
   font_property_table for the meaning of the arguments.  */

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static Lisp_Object font_prop_validate P_ ((int, Lisp_Object, Lisp_Object));
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static Lisp_Object font_prop_validate_symbol P_ ((Lisp_Object, Lisp_Object));
static Lisp_Object font_prop_validate_style P_ ((Lisp_Object, Lisp_Object));
static Lisp_Object font_prop_validate_non_neg P_ ((Lisp_Object, Lisp_Object));
static Lisp_Object font_prop_validate_spacing P_ ((Lisp_Object, Lisp_Object));
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static int get_font_prop_index P_ ((Lisp_Object));
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static Lisp_Object
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font_prop_validate_symbol (prop, val)
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     Lisp_Object prop, val;
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{
  if (STRINGP (val))
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    val = Fintern (val, Qnil);
  if (! SYMBOLP (val))
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    val = Qerror;
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  else if (EQ (prop, QCregistry))
    val = Fintern (Fdowncase (SYMBOL_NAME (val)), Qnil);
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  return val;
}

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static Lisp_Object
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font_prop_validate_style (style, val)
     Lisp_Object style, val;
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{
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  enum font_property_index prop = (EQ (style, QCweight) ? FONT_WEIGHT_INDEX
				   : EQ (style, QCslant) ? FONT_SLANT_INDEX
				   : FONT_WIDTH_INDEX);
  int n;
  if (INTEGERP (val))
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    {
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      n = XINT (val);
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      if (((n >> 4) & 0xF)
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	  >= ASIZE (AREF (font_style_table, prop - FONT_WEIGHT_INDEX)))
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	val = Qerror;
      else
	{
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	  Lisp_Object elt = AREF (AREF (font_style_table, prop - FONT_WEIGHT_INDEX), (n >> 4) & 0xF);

	  if ((n & 0xF) + 1 >= ASIZE (elt))
	    val = Qerror;
	  else if (XINT (AREF (elt, 0)) != (n >> 8))
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	    val = Qerror;
	}
    }
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  else if (SYMBOLP (val))
    {
      int n = font_style_to_value (prop, val, 0);

      val = n >= 0 ? make_number (n) : Qerror;
    }
  else
    val = Qerror;
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  return val;
}

static Lisp_Object
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font_prop_validate_non_neg (prop, val)
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     Lisp_Object prop, val;
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{
  return (NATNUMP (val) || (FLOATP (val) && XFLOAT_DATA (val) >= 0)
	  ? val : Qerror);
}

static Lisp_Object
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font_prop_validate_spacing (prop, val)
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     Lisp_Object prop, val;
{
  if (NILP (val) || (NATNUMP (val) && XINT (val) <= FONT_SPACING_CHARCELL))
    return val;
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  if (SYMBOLP (val) && SBYTES (SYMBOL_NAME (val)) == 1)
    {
      char spacing = SDATA (SYMBOL_NAME (val))[0];

      if (spacing == 'c' || spacing == 'C')
	return make_number (FONT_SPACING_CHARCELL);
      if (spacing == 'm' || spacing == 'M')
	return make_number (FONT_SPACING_MONO);
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      if (spacing == 'p' || spacing == 'P')
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	return make_number (FONT_SPACING_PROPORTIONAL);
      if (spacing == 'd' || spacing == 'D')
	return make_number (FONT_SPACING_DUAL);
    }
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  return Qerror;
}

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static Lisp_Object
font_prop_validate_otf (prop, val)
     Lisp_Object prop, val;
{
  Lisp_Object tail, tmp;
  int i;

  /* VAL = (SCRIPT [ LANGSYS [ GSUB-FEATURES [ GPOS-FEATURES ]]])
     GSUB-FEATURES = (FEATURE ... [ nil FEATURE ... ]) | nil
     GPOS-FEATURES = (FEATURE ... [ nil FEATURE ... ]) | nil  */
  if (! CONSP (val))
    return Qerror;
  if (! SYMBOLP (XCAR (val)))
    return Qerror;
  tail = XCDR (val);
  if (NILP (tail))
    return val;
  if (! CONSP (tail) || ! SYMBOLP (XCAR (val)))
    return Qerror;
  for (i = 0; i < 2; i++)
    {
      tail = XCDR (tail);
      if (NILP (tail))
	return val;
      if (! CONSP (tail))
	return Qerror;
      for (tmp = XCAR (tail); CONSP (tmp); tmp = XCDR (tmp))
	if (! SYMBOLP (XCAR (tmp)))
	  return Qerror;
      if (! NILP (tmp))
	return Qerror;
    }
  return val;
}

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/* Structure of known font property keys and validater of the
   values.  */
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struct
{
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  /* Pointer to the key symbol.  */
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  Lisp_Object *key;
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  /* Function to validate PROP's value VAL, or NULL if any value is
     ok.  The value is VAL or its regularized value if VAL is valid,
     and Qerror if not.  */
  Lisp_Object (*validater) P_ ((Lisp_Object prop, Lisp_Object val));
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} font_property_table[] =
  { { &QCtype, font_prop_validate_symbol },
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    { &QCfoundry, font_prop_validate_symbol },
    { &QCfamily, font_prop_validate_symbol },
    { &QCadstyle, font_prop_validate_symbol },
    { &QCregistry, font_prop_validate_symbol },
    { &QCweight, font_prop_validate_style },
    { &QCslant, font_prop_validate_style },
    { &QCwidth, font_prop_validate_style },
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    { &QCsize, font_prop_validate_non_neg },
    { &QCdpi, font_prop_validate_non_neg },
    { &QCspacing, font_prop_validate_spacing },
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    { &QCavgwidth, font_prop_validate_non_neg },
    /* The order of the above entries must match with enum
       font_property_index.  */
    { &QClang, font_prop_validate_symbol },
    { &QCscript, font_prop_validate_symbol },
    { &QCotf, font_prop_validate_otf }
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  };

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/* Size (number of elements) of the above table.  */
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#define FONT_PROPERTY_TABLE_SIZE \
  ((sizeof font_property_table) / (sizeof *font_property_table))

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/* Return an index number of font property KEY or -1 if KEY is not an
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   already known property.  */
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static int
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get_font_prop_index (key)
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     Lisp_Object key;
{
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  int i;

  for (i = 0; i < FONT_PROPERTY_TABLE_SIZE; i++)
    if (EQ (key, *font_property_table[i].key))
      return i;
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  return -1;
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}

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/* Validate the font property.  The property key is specified by the
   symbol PROP, or the index IDX (if PROP is nil).  If VAL is invalid,
   signal an error.  The value is VAL or the regularized one.  */
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static Lisp_Object
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font_prop_validate (idx, prop, val)
     int idx;
     Lisp_Object prop, val;
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{
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  Lisp_Object validated;
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  if (NILP (val))
    return val;
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  if (NILP (prop))
    prop = *font_property_table[idx].key;
  else
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    {
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      idx = get_font_prop_index (prop);
      if (idx < 0)
	return val;
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    }
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  validated = (font_property_table[idx].validater) (prop, val);
  if (EQ (validated, Qerror))
    signal_error ("invalid font property", Fcons (prop, val));
  return validated;
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}
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/* Store VAL as a value of extra font property PROP in FONT while
   keeping the sorting order.  Don't check the validity of VAL.  */
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Lisp_Object
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font_put_extra (font, prop, val)
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     Lisp_Object font, prop, val;
{
  Lisp_Object extra = AREF (font, FONT_EXTRA_INDEX);
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  Lisp_Object slot = (NILP (extra) ? Qnil : assq_no_quit (prop, extra));
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  if (NILP (slot))
    {
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      Lisp_Object prev = Qnil;

      while (CONSP (extra)
	     && NILP (Fstring_lessp (prop, XCAR (XCAR (extra)))))
	prev = extra, extra = XCDR (extra);
      if (NILP (prev))
	ASET (font, FONT_EXTRA_INDEX, Fcons (Fcons (prop, val), extra));
      else
	XSETCDR (prev, Fcons (Fcons (prop, val), extra));
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      return val;
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    }
  XSETCDR (slot, val);
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  return val;
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}

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/* Font name parser and unparser */

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static int parse_matrix P_ ((char *));
static int font_expand_wildcards P_ ((Lisp_Object *, int));
static int font_parse_name P_ ((char *, Lisp_Object));
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/* An enumerator for each field of an XLFD font name.  */
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enum xlfd_field_index
{
  XLFD_FOUNDRY_INDEX,
  XLFD_FAMILY_INDEX,
  XLFD_WEIGHT_INDEX,
  XLFD_SLANT_INDEX,
  XLFD_SWIDTH_INDEX,
  XLFD_ADSTYLE_INDEX,
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  XLFD_PIXEL_INDEX,
  XLFD_POINT_INDEX,
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  XLFD_RESX_INDEX,
  XLFD_RESY_INDEX,
  XLFD_SPACING_INDEX,
  XLFD_AVGWIDTH_INDEX,
  XLFD_REGISTRY_INDEX,
  XLFD_ENCODING_INDEX,
  XLFD_LAST_INDEX
};

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/* An enumerator for mask bit corresponding to each XLFD field.  */
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enum xlfd_field_mask
{
  XLFD_FOUNDRY_MASK = 0x0001,
  XLFD_FAMILY_MASK = 0x0002,
  XLFD_WEIGHT_MASK = 0x0004,
  XLFD_SLANT_MASK = 0x0008,
  XLFD_SWIDTH_MASK = 0x0010,
  XLFD_ADSTYLE_MASK = 0x0020,
  XLFD_PIXEL_MASK = 0x0040,
  XLFD_POINT_MASK = 0x0080,
  XLFD_RESX_MASK = 0x0100,
  XLFD_RESY_MASK = 0x0200,
  XLFD_SPACING_MASK = 0x0400,
  XLFD_AVGWIDTH_MASK = 0x0800,
  XLFD_REGISTRY_MASK = 0x1000,
  XLFD_ENCODING_MASK = 0x2000
};


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/* Parse P pointing the pixel/point size field of the form
   `[A B C D]' which specifies a transformation matrix:

	A  B  0
	C  D  0
	0  0  1

   by which all glyphs of the font are transformed.  The spec says
   that scalar value N for the pixel/point size is equivalent to:
   A = N * resx/resy, B = C = 0, D = N.

   Return the scalar value N if the form is valid.  Otherwise return
   -1.  */

static int
parse_matrix (p)
     char *p;
{
  double matrix[4];
  char *end;
  int i;

  for (i = 0, p++; i < 4 && *p && *p != ']'; i++)
    {
      if (*p == '~')
	matrix[i] = - strtod (p + 1, &end);
      else
	matrix[i] = strtod (p, &end);
      p = end;
    }
  return (i == 4 ? (int) matrix[3] : -1);
}

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/* Expand a wildcard field in FIELD (the first N fields are filled) to
   multiple fields to fill in all 14 XLFD fields while restring a
   field position by its contents.  */

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static int
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font_expand_wildcards (field, n)
     Lisp_Object field[XLFD_LAST_INDEX];
     int n;
{
  /* Copy of FIELD.  */
  Lisp_Object tmp[XLFD_LAST_INDEX];
  /* Array of information about where this element can go.  Nth
     element is for Nth element of FIELD. */
  struct {
    /* Minimum possible field.  */
    int from;
    /* Maxinum possible field.  */
    int to;
    /* Bit mask of possible field.  Nth bit corresponds to Nth field.  */
    int mask;
  } range[XLFD_LAST_INDEX];
  int i, j;
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  int range_from, range_to;
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  unsigned range_mask;

#define XLFD_SYMBOL_MASK (XLFD_FOUNDRY_MASK | XLFD_FAMILY_MASK \
			  | XLFD_ADSTYLE_MASK  | XLFD_REGISTRY_MASK)
#define XLFD_NULL_MASK (XLFD_FOUNDRY_MASK | XLFD_ADSTYLE_MASK)
#define XLFD_LARGENUM_MASK (XLFD_POINT_MASK | XLFD_RESX_MASK | XLFD_RESY_MASK \
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			    | XLFD_AVGWIDTH_MASK)
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#define XLFD_REGENC_MASK (XLFD_REGISTRY_MASK | XLFD_ENCODING_MASK)

  /* Initialize RANGE_MASK for FIELD[0] which can be 0th to (14 - N)th
     field.  The value is shifted to left one bit by one in the
     following loop.  */
  for (i = 0, range_mask = 0; i <= 14 - n; i++)
    range_mask = (range_mask << 1) | 1;

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  /* The triplet RANGE_FROM, RANGE_TO, and RANGE_MASK is a
     position-based retriction for FIELD[I].  */
  for (i = 0, range_from = 0, range_to = 14 - n; i < n;
       i++, range_from++, range_to++, range_mask <<= 1)
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    {
      Lisp_Object val = field[i];

      tmp[i] = val;
      if (NILP (val))
	{
	  /* Wildcard.  */
	  range[i].from = range_from;
	  range[i].to = range_to;
	  range[i].mask = range_mask;
	}
      else
	{
	  /* The triplet FROM, TO, and MASK is a value-based
	     retriction for FIELD[I].  */
	  int from, to;
	  unsigned mask;

	  if (INTEGERP (val))
	    {
	      int numeric = XINT (val);

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	      if (i + 1 == n)
		from = to = XLFD_ENCODING_INDEX,
		  mask = XLFD_ENCODING_MASK;
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	      else if (numeric == 0)
		from = XLFD_PIXEL_INDEX, to = XLFD_AVGWIDTH_INDEX,
		  mask = XLFD_PIXEL_MASK | XLFD_LARGENUM_MASK;
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	      else if (numeric <= 48)
		from = to = XLFD_PIXEL_INDEX,
		  mask = XLFD_PIXEL_MASK;
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	      else
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		from = XLFD_POINT_INDEX, to = XLFD_AVGWIDTH_INDEX,
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		  mask = XLFD_LARGENUM_MASK;
	    }
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	  else if (SBYTES (SYMBOL_NAME (val)) == 0)
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	    from = XLFD_FOUNDRY_INDEX, to = XLFD_ADSTYLE_INDEX,
	      mask = XLFD_NULL_MASK;
	  else if (i == 0)
	    from = to = XLFD_FOUNDRY_INDEX, mask = XLFD_FOUNDRY_MASK;
	  else if (i + 1 == n)
	    {
	      Lisp_Object name = SYMBOL_NAME (val);

	      if (SDATA (name)[SBYTES (name) - 1] == '*')
		from = XLFD_REGISTRY_INDEX, to = XLFD_ENCODING_INDEX,
		  mask = XLFD_REGENC_MASK;
	      else
		from = to = XLFD_ENCODING_INDEX,
		  mask = XLFD_ENCODING_MASK;
	    }
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	  else if (range_from <= XLFD_WEIGHT_INDEX
		   && range_to >= XLFD_WEIGHT_INDEX
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		   && FONT_WEIGHT_NAME_NUMERIC (val) >= 0)
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	    from = to = XLFD_WEIGHT_INDEX, mask = XLFD_WEIGHT_MASK;
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	  else if (range_from <= XLFD_SLANT_INDEX
		   && range_to >= XLFD_SLANT_INDEX
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		   && FONT_SLANT_NAME_NUMERIC (val) >= 0)
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	    from = to = XLFD_SLANT_INDEX, mask = XLFD_SLANT_MASK;
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	  else if (range_from <= XLFD_SWIDTH_INDEX
		   && range_to >= XLFD_SWIDTH_INDEX
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		   && FONT_WIDTH_NAME_NUMERIC (val) >= 0)
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	    from = to = XLFD_SWIDTH_INDEX, mask = XLFD_SWIDTH_MASK;
	  else
	    {
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	      if (EQ (val, Qc) || EQ (val, Qm) || EQ (val, Qp) || EQ (val, Qd))
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		from = to = XLFD_SPACING_INDEX, mask = XLFD_SPACING_MASK;
	      else
		from = XLFD_FOUNDRY_INDEX, to = XLFD_ENCODING_INDEX,
		  mask = XLFD_SYMBOL_MASK;
	    }

	  /* Merge position-based and value-based restrictions.  */
	  mask &= range_mask;
	  while (from < range_from)
	    mask &= ~(1 << from++);
	  while (from < 14 && ! (mask & (1 << from)))
	    from++;
	  while (to > range_to)
	    mask &= ~(1 << to--);
	  while (to >= 0 && ! (mask & (1 << to)))
	    to--;
	  if (from > to)
	    return -1;
	  range[i].from = from;
	  range[i].to = to;
	  range[i].mask = mask;

	  if (from > range_from || to < range_to)
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	    {
	      /* The range is narrowed by value-based restrictions.
		 Reflect it to the other fields.  */

	      /* Following fields should be after FROM.  */
	      range_from = from;
	      /* Preceding fields should be before TO.  */
	      for (j = i - 1, from--, to--; j >= 0; j--, from--, to--)
		{
		  /* Check FROM for non-wildcard field.  */
		  if (! NILP (tmp[j]) && range[j].from < from)
		    {
		      while (range[j].from < from)
			range[j].mask &= ~(1 << range[j].from++);
		      while (from < 14 && ! (range[j].mask & (1 << from)))
			from++;
		      range[j].from = from;
		    }
		  else
		    from = range[j].from;
		  if (range[j].to > to)
		    {
		      while (range[j].to > to)
			range[j].mask &= ~(1 << range[j].to--);
		      while (to >= 0 && ! (range[j].mask & (1 << to)))
			to--;
		      range[j].to = to;
		    }
		  else
		    to = range[j].to;
		  if (from > to)
		    return -1;
		}
	    }
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	}
    }

  /* Decide all fileds from restrictions in RANGE.  */
  for (i = j = 0; i < n ; i++)
    {
      if (j < range[i].from)
	{
	  if (i == 0 || ! NILP (tmp[i - 1]))
	    /* None of TMP[X] corresponds to Jth field.  */
	    return -1;
	  for (; j < range[i].from; j++)
	    field[j] = Qnil;
	}
      field[j++] = tmp[i];
    }
  if (! NILP (tmp[n - 1]) && j < XLFD_REGISTRY_INDEX)
    return -1;
  for (; j < XLFD_LAST_INDEX; j++)
    field[j] = Qnil;
  if (INTEGERP (field[XLFD_ENCODING_INDEX]))
    field[XLFD_ENCODING_INDEX]
      = Fintern (Fnumber_to_string (field[XLFD_ENCODING_INDEX]), Qnil);
  return 0;
}

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#ifdef ENABLE_CHECKING
/* Match a 14-field XLFD pattern against a full XLFD font name.  */
static int
font_match_xlfd (char *pattern, char *name)
{
  while (*pattern && *name)
    {
      if (*pattern == *name)
	pattern++;
      else if (*pattern == '*')
	if (*name == pattern[1])
	  pattern += 2;
	else
	  ;
      else
	return 0;
      name++;
    }
  return 1;
}

/* Make sure the font object matches the XLFD font name.  */
static int
font_check_xlfd_parse (Lisp_Object font, char *name)
{
  char name_check[256];
  font_unparse_xlfd (font, 0, name_check, 255);
  return font_match_xlfd (name_check, name);
}

#endif

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/* Parse NAME (null terminated) as XLFD and store information in FONT
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   (font-spec or font-entity).  Size property of FONT is set as
   follows:
	specified XLFD fields		FONT property
	---------------------		-------------
	PIXEL_SIZE			PIXEL_SIZE (Lisp integer)
	POINT_SIZE and RESY		calculated pixel size (Lisp integer)
	POINT_SIZE			POINT_SIZE/10 (Lisp float)

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   If NAME is successfully parsed, return 0.  Otherwise return -1.
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   FONT is usually a font-spec, but when this function is called from
   X font backend driver, it is a font-entity.  In that case, NAME is
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   a fully specified XLFD.  */
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int
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font_parse_xlfd (name, font)
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     char *name;
     Lisp_Object font;
{
  int len = strlen (name);
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  int i, j, n;
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  char *f[XLFD_LAST_INDEX + 1];
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  Lisp_Object val;
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  char *p;
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  if (len > 255)
    /* Maximum XLFD name length is 255. */
    return -1;
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  /* Accept "*-.." as a fully specified XLFD. */
  if (name[0] == '*' && name[1] == '-')
    i = 1, f[XLFD_FOUNDRY_INDEX] = name;
  else
    i = 0;
  for (p = name + i; *p; p++)
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    if (*p == '-')
      {
	f[i++] = p + 1;
	if (i == XLFD_LAST_INDEX)
	  break;
      }
  f[i] = name + len;
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#define INTERN_FIELD(N) font_intern_prop (f[N], f[(N) + 1] - 1 - f[N], 0)
#define INTERN_FIELD_SYM(N) font_intern_prop (f[N], f[(N) + 1] - 1 - f[N], 1)
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  if (i == XLFD_LAST_INDEX)
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    {
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      /* Fully specified XLFD.  */
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      int pixel_size;

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      ASET (font, FONT_FOUNDRY_INDEX, INTERN_FIELD_SYM (XLFD_FOUNDRY_INDEX));
      ASET (font, FONT_FAMILY_INDEX, INTERN_FIELD_SYM (XLFD_FAMILY_INDEX));
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      for (i = XLFD_WEIGHT_INDEX, j = FONT_WEIGHT_INDEX;
	   i <= XLFD_SWIDTH_INDEX; i++, j++)
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	{
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	  val = INTERN_FIELD_SYM (i);
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	  if (! NILP (val))
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	    {
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	      if ((n = font_style_to_value (j, INTERN_FIELD_SYM (i), 0)) < 0)
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		return -1;
	      ASET (font, j, make_number (n));
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	    }
	}
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      ASET (font, FONT_ADSTYLE_INDEX, INTERN_FIELD_SYM (XLFD_ADSTYLE_INDEX));
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      if (strcmp (f[XLFD_REGISTRY_INDEX], "*-*") == 0)
	ASET (font, FONT_REGISTRY_INDEX, Qnil);
      else
	ASET (font, FONT_REGISTRY_INDEX,
	      font_intern_prop (f[XLFD_REGISTRY_INDEX],
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				f[XLFD_LAST_INDEX] - f[XLFD_REGISTRY_INDEX],
				1));
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      p = f[XLFD_PIXEL_INDEX];
      if (*p == '[' && (pixel_size = parse_matrix (p)) >= 0)
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	ASET (font, FONT_SIZE_INDEX, make_number (pixel_size));
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      else
	{
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	  val = INTERN_FIELD (XLFD_PIXEL_INDEX);
	  if (INTEGERP (val))
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	    ASET (font, FONT_SIZE_INDEX, val);
	  else
	    {
	      double point_size = -1;

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	      font_assert (FONT_SPEC_P (font));
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	      p = f[XLFD_POINT_INDEX];
	      if (*p == '[')
		point_size = parse_matrix (p);
	      else if (isdigit (*p))
		point_size = atoi (p), point_size /= 10;
	      if (point_size >= 0)
		ASET (font, FONT_SIZE_INDEX, make_float (point_size));
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	    }
	}
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      ASET (font, FONT_DPI_INDEX, INTERN_FIELD (XLFD_RESY_INDEX));
      val = INTERN_FIELD (XLFD_SPACING_INDEX);
      if (! NILP (val))
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	{
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	  val = font_prop_validate_spacing (QCspacing, val);
	  if (! INTEGERP (val))
	    return -1;
	  ASET (font, FONT_SPACING_INDEX, val);
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	}
      p = f[XLFD_AVGWIDTH_INDEX];
      if (*p == '~')
	p++;
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      ASET (font, FONT_AVGWIDTH_INDEX,
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	    font_intern_prop (p, f[XLFD_REGISTRY_INDEX] - 1 - p, 0));
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    }
  else
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    {
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      int wild_card_found = 0;
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      Lisp_Object prop[XLFD_LAST_INDEX];
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      if (FONT_ENTITY_P (font))
	return -1;
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      for (j = 0; j < i; j++)
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	{
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	  if (*f[j] == '*')
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	    {
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	      if (f[j][1] && f[j][1] != '-')
		return -1;
	      prop[j] = Qnil;
	      wild_card_found = 1;
	    }
	  else if (j + 1 < i)
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	    prop[j] = INTERN_FIELD (j);
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	  else
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	    prop[j] = font_intern_prop (f[j], f[i] - f[j], 0);
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	}
      if (! wild_card_found)
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	return -1;
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      if (font_expand_wildcards (prop, i) < 0)
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	return -1;
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      ASET (font, FONT_FOUNDRY_INDEX, prop[XLFD_FOUNDRY_INDEX]);
      ASET (font, FONT_FAMILY_INDEX, prop[XLFD_FAMILY_INDEX]);
      for (i = XLFD_WEIGHT_INDEX, j = FONT_WEIGHT_INDEX;
	   i <= XLFD_SWIDTH_INDEX; i++, j++)
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	if (! NILP (prop[i]))
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	  {
	    if ((n = font_style_to_value (j, prop[i], 1)) < 0)
	      return -1;
	    ASET (font, j, make_number (n));
	  }
      ASET (font, FONT_ADSTYLE_INDEX, prop[XLFD_ADSTYLE_INDEX]);
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      val = prop[XLFD_REGISTRY_INDEX];
      if (NILP (val))
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	{
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	  val = prop[XLFD_ENCODING_INDEX];
	  if (! NILP (val))
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	    val = concat2 (build_string ("*-"), SYMBOL_NAME (val));
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	}
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      else if (NILP (prop[XLFD_ENCODING_INDEX]))
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	val = concat2 (SYMBOL_NAME (val), build_string ("-*"));
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      else
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	val = concat3 (SYMBOL_NAME (val), build_string ("-"),
		       SYMBOL_NAME (prop[XLFD_ENCODING_INDEX]));
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      if (! NILP (val))
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	ASET (font, FONT_REGISTRY_INDEX, Fintern (val, Qnil));
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      if (INTEGERP (prop[XLFD_PIXEL_INDEX]))
	ASET (font, FONT_SIZE_INDEX, prop[XLFD_PIXEL_INDEX]);
      else if (INTEGERP (prop[XLFD_POINT_INDEX]))
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	{
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	  double point_size = XINT (prop[XLFD_POINT_INDEX]);
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	  ASET (font, FONT_SIZE_INDEX, make_float (point_size / 10));
	}
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      if (INTEGERP (prop[XLFD_RESX_INDEX]))
	ASET (font, FONT_DPI_INDEX, prop[XLFD_RESY_INDEX]);
      if (! NILP (prop[XLFD_SPACING_INDEX]))
	{
	  val = font_prop_validate_spacing (QCspacing,
					    prop[XLFD_SPACING_INDEX]);
	  if (! INTEGERP (val))
	    return -1;
	  ASET (font, FONT_SPACING_INDEX, val);
	}
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      if (INTEGERP (prop[XLFD_AVGWIDTH_INDEX]))
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	ASET (font, FONT_AVGWIDTH_INDEX, prop[XLFD_AVGWIDTH_INDEX]);
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    }

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  return 0;
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}

/* Store XLFD name of FONT (font-spec or font-entity) in NAME (NBYTES
   length), and return the name length.  If FONT_SIZE_INDEX of FONT is
   0, use PIXEL_SIZE instead.  */

int
font_unparse_xlfd (font, pixel_size, name, nbytes)
     Lisp_Object font;
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     int pixel_size;
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     char *name;
     int nbytes;
{
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  char *f[XLFD_REGISTRY_INDEX + 1];
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  Lisp_Object val;
  int i, j, len = 0;