font.c 114 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.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.

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
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */

#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 */

#ifdef MAC_OS
#include "macterm.h"
#endif /* MAC_OS */

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#ifndef FONT_DEBUG
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#define FONT_DEBUG
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#endif
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#ifdef FONT_DEBUG
#undef xassert
#define xassert(X)	do {if (!(X)) abort ();} while (0)
#else
#define xassert(X)	(void) 0
#endif

int enable_font_backend;

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Lisp_Object Qopentype;

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/* Important character set symbols.  */
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Lisp_Object Qiso8859_1, Qiso10646_1, Qunicode_bmp, Qunicode_sip;
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/* Like CHECK_FONT_SPEC but also validate properties of the font-spec,
   and set X to the validated result.  */

#define CHECK_VALIDATE_FONT_SPEC(x)				\
  do {								\
    if (! FONT_SPEC_P (x)) x = wrong_type_argument (Qfont, x);	\
    x = font_prop_validate (x);					\
  } while (0)

/* Number of pt per inch (from the TeXbook).  */
#define PT_PER_INCH 72.27

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/* Return a pixel size (integer) corresponding to POINT size (double)
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   on resolution DPI.  */
#define POINT_TO_PIXEL(POINT, DPI) ((POINT) * (DPI) / PT_PER_INCH + 0.5)
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/* Return a point size (double) corresponding to POINT size (integer)
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   on resolution DPI.  */
#define PIXEL_TO_POINT(PIXEL, DPI) ((PIXEL) * PT_PER_INCH * 10 / (DPI) + 0.5)
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/* Special string of zero length.  It is used to specify a NULL name
   in a font properties (e.g. adstyle).  We don't use the symbol of
   NULL name because it's confusing (Lisp printer prints nothing for
   it). */
Lisp_Object null_string;

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

/* Vector of 3 elements.  Each element is an alist for one of font
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   style properties (weight, slant, width).  Each alist contains a
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   mapping between symbolic property values (e.g. `medium' for weight)
   and numeric property values (e.g. 100).  So, it looks like this:
	[((thin . 0) ... (heavy . 210))
	 ((ro . 0) ... (ot . 210))
	 ((ultracondensed . 50) ... (wide . 200))]  */
static Lisp_Object font_style_table;

/* Alist of font family vs the corresponding aliases.
   Each element has this form:
	(FAMILY ALIAS1 ALIAS2 ...)   */

static Lisp_Object font_family_alist;

/* Symbols representing keys of normal font properties.  */
extern Lisp_Object QCtype, QCfamily, QCweight, QCslant, QCwidth, QCsize, QCname;
Lisp_Object QCfoundry, QCadstyle, QCregistry, QCextra;
/* Symbols representing keys of font extra info.  */
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Lisp_Object QCspacing, QCdpi, QCscalable, QCotf, QClanguage, QCscript;
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Lisp_Object QCantialias;
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/* Symbols representing values of font spacing property.  */
Lisp_Object Qc, Qm, Qp, Qd;
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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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static int font_pixel_size P_ ((FRAME_PTR f, Lisp_Object));
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static Lisp_Object prop_name_to_numeric P_ ((enum font_property_index,
					     Lisp_Object));
static Lisp_Object prop_numeric_to_name P_ ((enum font_property_index, int));
static Lisp_Object font_open_entity P_ ((FRAME_PTR, Lisp_Object, int));
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static void build_font_family_alist P_ ((void));
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/* Number of registered font drivers.  */
static int num_font_drivers;

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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;
{
  Lisp_Object size = AREF (spec, FONT_SIZE_INDEX);
  double point_size;
  int pixel_size, dpi;
  Lisp_Object extra, val;
      
  if (INTEGERP (size))
    return XINT (size);
  if (NILP (size))
    return 0;
  point_size = XFLOAT_DATA (size);
  extra = AREF (spec, FONT_EXTRA_INDEX);
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  val = assq_no_quit (QCdpi, extra);
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  if (CONSP (val))
    {
      if (INTEGERP (XCDR (val)))
	dpi = XINT (XCDR (val));
      else
	dpi = XFLOAT_DATA (XCDR (val)) + 0.5;
    }
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  else
    dpi = f->resy;
  pixel_size = POINT_TO_PIXEL (point_size, dpi);
  return pixel_size;
}

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/* Return a numeric value corresponding to PROP's NAME (symbol).  If
   NAME is not registered in font_style_table, return Qnil.  PROP must
   be one of FONT_{WEIGHT|SLANT|SWIDTH}_INDEX.  */

static Lisp_Object
prop_name_to_numeric (prop, name)
     enum font_property_index prop;
     Lisp_Object name;
{
  int table_index = prop - FONT_WEIGHT_INDEX;
  Lisp_Object val;

  val = assq_no_quit (name, AREF (font_style_table, table_index));
  return (NILP (val) ? Qnil : XCDR (val));
}


/* Return a name (symbol) corresponding to PROP's NUMERIC value.  If
   no name is registered for NUMERIC in font_style_table, return a
   symbol of integer name (e.g. `123').  PROP must be one of
   FONT_{WEIGHT|SLANT|SWIDTH}_INDEX.  */

static Lisp_Object
prop_numeric_to_name (prop, numeric)
     enum font_property_index prop;
     int numeric;
{
  int table_index = prop - FONT_WEIGHT_INDEX;
  Lisp_Object table = AREF (font_style_table, table_index);
  char buf[10];

  while (! NILP (table))
    {
      if (XINT (XCDR (XCAR (table))) >= numeric)
	{
	  if (XINT (XCDR (XCAR (table))) == numeric)
	    return XCAR (XCAR (table));
	  else
	    break;
	}
      table = XCDR (table);
    }
  sprintf (buf, "%d", numeric);
  return intern (buf);
}


/* Return a symbol whose name is STR (length LEN).  If STR contains
   uppercase letters, downcase them in advance.  */

Lisp_Object
intern_downcase (str, len)
     char *str;
     int len;
{
  char *buf;
  int i;

  for (i = 0; i < len; i++)
    if (isupper (str[i]))
      break;
  if (i == len)
    return Fintern (make_unibyte_string (str, len), Qnil);
  buf = alloca (len);
  if (! buf)
    return Fintern (null_string, Qnil);
  bcopy (str, buf, len);
  for (; i < len; i++)
    if (isascii (buf[i]))
      buf[i] = tolower (buf[i]);
  return Fintern (make_unibyte_string (buf, len), Qnil);
}

extern Lisp_Object Vface_alternative_font_family_alist;

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/* Setup font_family_alist of the form:
	((FAMILY-SYMBOL ALIAS-SYMBOL ...) ...)
   from Vface_alternative_font_family_alist of the form:
	((FAMILY-STRING ALIAS-STRING ...) ...)  */

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static void
build_font_family_alist ()
{
  Lisp_Object alist = Vface_alternative_font_family_alist;

  for (; CONSP (alist); alist = XCDR (alist))
    {
      Lisp_Object tail, elt;

      for (tail = XCAR (alist), elt = Qnil ; CONSP (tail); tail = XCDR (tail))
	elt = nconc2 (elt, Fcons (Fintern (XCAR (tail), Qnil), Qnil));
      font_family_alist = Fcons (elt, font_family_alist);
    }
}

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extern Lisp_Object find_font_encoding P_ ((Lisp_Object));

/* 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;

  val = assq_no_quit (registry, font_charset_alist);
  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)));
	    }
	}      
      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.  */

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, int));
static Lisp_Object font_prop_validate 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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{
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  if (EQ (prop, QCotf))
    return (SYMBOLP (val) ? val : Qerror);
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  if (STRINGP (val))
    val = (SCHARS (val) == 0 ? null_string
	   : intern_downcase ((char *) SDATA (val), SBYTES (val)));
  else if (SYMBOLP (val))
    {
      if (SCHARS (SYMBOL_NAME (val)) == 0)
	val = null_string;
    }
  else
    val = Qerror;
  return val;
}

static Lisp_Object
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font_prop_validate_style (prop, val)
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     Lisp_Object prop, val;
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{
  if (! INTEGERP (val))
    {
      if (STRINGP (val))
	val = intern_downcase ((char *) SDATA (val), SBYTES (val));
      if (! SYMBOLP (val))
	val = Qerror;
      else
	{
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	  enum font_property_index prop_index
	    = (EQ (prop, QCweight) ? FONT_WEIGHT_INDEX
	       : EQ (prop, QCslant) ? FONT_SLANT_INDEX
	       : FONT_WIDTH_INDEX);

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	  val = prop_name_to_numeric (prop_index, val);
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	  if (NILP (val))
	    val = Qerror;
	}
    }
  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;
  if (EQ (val, Qc))
    return make_number (FONT_SPACING_CHARCELL);
  if (EQ (val, Qm))
    return make_number (FONT_SPACING_MONO);
  if (EQ (val, Qp))
    return make_number (FONT_SPACING_PROPORTIONAL);
  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 },
    { &QClanguage, font_prop_validate_symbol },
    { &QCscript, font_prop_validate_symbol },
    { &QCdpi, font_prop_validate_non_neg },
    { &QCspacing, font_prop_validate_spacing },
    { &QCscalable, NULL },
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    { &QCotf, font_prop_validate_otf },
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    { &QCantialias, font_prop_validate_symbol }
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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
   already known property.  Start searching font_property_table from
   index FROM (which is 0 or FONT_EXTRA_INDEX).  */

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static int
get_font_prop_index (key, from)
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     Lisp_Object key;
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     int from;
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{
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  for (; from < FONT_PROPERTY_TABLE_SIZE; from++)
    if (EQ (key, *font_property_table[from].key))
      return from;
  return -1;
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}

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/* Validate font properties in SPEC (vector) while updating elements
   to regularized values.  Signal an error if an invalid property is
   found. */

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static Lisp_Object
font_prop_validate (spec)
     Lisp_Object spec;
{
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  int i;
  Lisp_Object prop, val, extra;
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  for (i = FONT_TYPE_INDEX; i < FONT_EXTRA_INDEX; i++)
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    {
      if (! NILP (AREF (spec, i)))
	{
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	  prop = *font_property_table[i].key;
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	  val = (font_property_table[i].validater) (prop, AREF (spec, i));
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	  if (EQ (val, Qerror))
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	    Fsignal (Qfont, list2 (build_string ("invalid font property"),
				   Fcons (prop, AREF (spec, i))));
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	  ASET (spec, i, val);
	}
    }
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  for (extra = AREF (spec, FONT_EXTRA_INDEX);
       CONSP (extra); extra = XCDR (extra))
    {
      Lisp_Object elt = XCAR (extra);

      prop = XCAR (elt);
      i = get_font_prop_index (prop, FONT_EXTRA_INDEX);
      if (i >= 0
	  && font_property_table[i].validater)
	{
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	  val = (font_property_table[i].validater) (prop, XCDR (elt));
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	  if (EQ (val, Qerror))
	    Fsignal (Qfont, list2 (build_string ("invalid font property"),
				   elt));
	  XSETCDR (elt, val);
	}
    }
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  return spec;
}
      
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/* Store VAL as a value of extra font property PROP in FONT.  */

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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))
    {
      extra = Fcons (Fcons (prop, val), extra);
      ASET (font, FONT_EXTRA_INDEX, 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 Lisp_Object intern_font_field P_ ((char *, int));
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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/* Return a Lispy value of a XLFD font field at STR and LEN bytes.
   If LEN is zero, it returns `null_string'.
   If STR is "*", it returns nil.
   If all characters in STR are digits, it returns an integer.
   Otherwise, it returns a symbol interned from downcased STR.  */
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static Lisp_Object
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intern_font_field (str, len)
     char *str;
     int len;
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{
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  int i;
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  if (len == 0)
    return null_string;
  if (*str == '*' && len == 1)
    return Qnil;
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  if (isdigit (*str))
    {
      for (i = 1; i < len; i++)
	if (! isdigit (str[i]))
	  break;
      if (i == len)
	return make_number (atoi (str));
    }
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  return intern_downcase (str, len);
}

/* 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 
		from = XLFD_POINT_INDEX, to = XLFD_AVGWIDTH_INDEX,
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		  mask = XLFD_LARGENUM_MASK;
	    }
	  else if (EQ (val, null_string))
	    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
		   && !NILP (prop_name_to_numeric (FONT_WEIGHT_INDEX, val)))
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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
		   && !NILP (prop_name_to_numeric (FONT_SLANT_INDEX, val)))
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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
		   && !NILP (prop_name_to_numeric (FONT_WIDTH_INDEX, val)))
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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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/* 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
   a fully specified XLFD, and we set FONT_EXTRA_INDEX of FONT to a
   symbol RESX-RESY-SPACING-AVGWIDTH.
*/
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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);
  int i, j;
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  Lisp_Object dpi, spacing;
  int avgwidth;
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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++)
    if (*p == '-' && i < XLFD_LAST_INDEX)
      f[i++] = p + 1;
  f[i] = p;
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  dpi = spacing = Qnil;
  avgwidth = -1;
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  if (i == XLFD_LAST_INDEX)
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    {
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      int pixel_size;

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      /* Fully specified XLFD.  */
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      for (i = 0, j = FONT_FOUNDRY_INDEX; i < XLFD_WEIGHT_INDEX; i++, j++)
	{
	  val = intern_font_field (f[i], f[i + 1] - 1 - f[i]);
	  if (! NILP (val))
	    ASET (font, j, val);
	}
      for (j = FONT_WEIGHT_INDEX; i < XLFD_ADSTYLE_INDEX; i++, j++)
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	{
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	  val = intern_font_field (f[i], f[i + 1] - 1 - f[i]);
	  if (! NILP (val))
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	    {
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	      Lisp_Object numeric = prop_name_to_numeric (j, val);

	      if (INTEGERP (numeric))
		val = numeric;
	      ASET (font, j, val);
	    }
	}
      val = intern_font_field (f[i], f[i + 1] - 1 - f[i]);
      if (! NILP (val))
	ASET (font, FONT_ADSTYLE_INDEX, val);
      i = XLFD_REGISTRY_INDEX;
      val = intern_font_field (f[i], f[i + 2] - f[i]);
      if (! NILP (val))
	ASET (font, FONT_REGISTRY_INDEX, val);

      p = f[XLFD_PIXEL_INDEX];
      if (*p == '[' && (pixel_size = parse_matrix (p)) >= 0)
	ASET (font, FONT_SIZE_INDEX, make_number (pixel_size));	      
      else
	{
	  i = XLFD_PIXEL_INDEX;
	  val = intern_font_field (f[i], f[i + 1] - 1 - f[i]);
	  if (! NILP (val))
	    ASET (font, FONT_SIZE_INDEX, val);
	  else
	    {
	      double point_size = -1;

	      xassert (FONT_SPEC_P (font));
	      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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	      else
		{
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		  i = XLFD_PIXEL_INDEX;
		  val = intern_font_field (f[i], f[i + 1] - 1 - f[i]);
		  if (! NILP (val))
		    ASET (font, FONT_SIZE_INDEX, val);
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		}
	    }
	}
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      /* Parse RESX, RESY, SPACING, and AVGWIDTH.  */
      if (FONT_ENTITY_P (font))
	{
	  i = XLFD_RESX_INDEX;
	  ASET (font, FONT_EXTRA_INDEX,
		intern_font_field (f[i], f[XLFD_REGISTRY_INDEX] - 1 - f[i]));
	  return 0;
	}

      /* Here we just setup DPI, SPACING, and AVGWIDTH.  They are set
	 in FONT_EXTRA_INDEX later.  */
      i = XLFD_RESX_INDEX;
      dpi = intern_font_field (f[i], f[i + 1] - 1 - f[i]);
      i = XLFD_SPACING_INDEX;
      spacing = intern_font_field (f[i], f[i + 1] - 1 - f[i]);
      p = f[XLFD_AVGWIDTH_INDEX];
      if (*p == '~')
	p++;
      if (isdigit (*p))
	avgwidth = atoi (p);
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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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      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 (isdigit (*f[j]))
	    {
	      for (p = f[j] + 1; isdigit (*p); p++);
	      if (*p && *p != '-')
		prop[j] = intern_downcase (f[j], p - f[j]);
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	      else
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		prop[j] = make_number (atoi (f[j]));
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	    }
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	  else if (j + 1 < i)
	    prop[j] = intern_font_field (f[j], f[j + 1] - 1 - f[j]);
	  else
	    prop[j] = intern_font_field (f[j], f[i] - f[j]);
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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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      for (i = 0, j = FONT_FOUNDRY_INDEX; i < XLFD_WEIGHT_INDEX; i++, j++)
	if (! NILP (prop[i]))
	  ASET (font, j, prop[i]);
      for (j = FONT_WEIGHT_INDEX; i < XLFD_ADSTYLE_INDEX; i++, j++)
	if (! NILP (prop[i]))
	  ASET (font, j, prop[i]);
      if (! NILP (prop[XLFD_ADSTYLE_INDEX]))
	ASET (font, FONT_ADSTYLE_INDEX, prop[XLFD_ADSTYLE_INDEX]);
      val = prop[XLFD_REGISTRY_INDEX];
      if (NILP (val))
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	{
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	  val = prop[XLFD_ENCODING_INDEX];
	  if (! NILP (val))
	    val = Fintern (concat2 (build_string ("*-"), SYMBOL_NAME (val)),
			   Qnil);
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	}
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      else if (NILP (prop[XLFD_ENCODING_INDEX]))
	val = Fintern (concat2 (SYMBOL_NAME (val), build_string ("-*")),
		       Qnil);
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      else
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	val = Fintern (concat3 (SYMBOL_NAME (val), build_string ("-"),
				SYMBOL_NAME (prop[XLFD_ENCODING_INDEX])),
		       Qnil);
      if (! NILP (val))
	ASET (font, FONT_REGISTRY_INDEX, val);

      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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      dpi = prop[XLFD_RESX_INDEX];
      spacing = prop[XLFD_SPACING_INDEX];
      if (INTEGERP (prop[XLFD_AVGWIDTH_INDEX]))
	avgwidth = XINT (prop[XLFD_AVGWIDTH_INDEX]);
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    }

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  if (! NILP (dpi))
    font_put_extra (font, QCdpi, dpi);
  if (! NILP (spacing))
    font_put_extra (font, QCspacing, spacing);
  if (avgwidth >= 0)
    font_put_extra (font, QCscalable, avgwidth == 0 ? Qt : Qnil);
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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;

  xassert (FONTP (font));

  for (i = FONT_FOUNDRY_INDEX, j = XLFD_FOUNDRY_INDEX; i <= FONT_REGISTRY_INDEX;
       i++, j++)
    {
      if (i == FONT_ADSTYLE_INDEX)
	j = XLFD_ADSTYLE_INDEX;
      else if (i == FONT_REGISTRY_INDEX)
	j = XLFD_REGISTRY_INDEX;
      val = AREF (font, i);
      if (NILP (val))
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	{
	  if (j == XLFD_REGISTRY_INDEX)
	    f[j] = "*-*", len += 4;
	  else
	    f[j] = "*", len += 2;
	}
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      else
	{
	  if (SYMBOLP (val))
	    val = SYMBOL_NAME (val);
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	  if (j == XLFD_REGISTRY_INDEX
	      && ! strchr ((char *) SDATA (val), '-'))
	    {
	      /* Change "jisx0208*" and "jisx0208" to "jisx0208*-*".  */
	      if (SDATA (val)[SBYTES (val) - 1] == '*')
		{
		  f[j] = alloca (SBYTES (val) + 3);
		  sprintf (f[j], "%s-*", SDATA (val));
		  len += SBYTES (val) + 3;
		}
	      else
		{
		  f[j] = alloca (SBYTES (val) + 4);
		  sprintf (f[j], "%s*-*", SDATA (val));
		  len += SBYTES (val) + 4;
		}
	    }
	  else
	    f[j] = (char *) SDATA (val), len += SBYTES (val) + 1;
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	}
    }

  for (i = FONT_WEIGHT_INDEX, j = XLFD_WEIGHT_INDEX; i <= FONT_WIDTH_INDEX;
       i++, j++)
    {
      val = AREF (font, i);
      if (NILP (val))
	f[j] = "*", len += 2;
      else
	{
	  if (INTEGERP (val))
	    val = prop_numeric_to_name (i, XINT (val));
	  if (SYMBOLP (val))
	    val = SYMBOL_NAME (val);
	  xassert (STRINGP (val));
	  f[j] = (char *) SDATA (val), len += SBYTES (val) + 1;
	}
    }

  val = AREF (font, FONT_SIZE_INDEX);
  xassert (NUMBERP (val) || NILP (val));
  if (INTEGERP (val))
    {
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      f[XLFD_PIXEL_INDEX] = alloca (22);
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      i = XINT (val);
      if (i > 0)
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	len += sprintf (f[XLFD_PIXEL_INDEX], "%d-*", i) + 1;
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      else if (pixel_size > 0)
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	len += sprintf (f[XLFD_PIXEL_INDEX], "%d-*", pixel_size) + 1;
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      f[XLFD_PIXEL_INDEX] = "*-*", len += 4;
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    }
  else if (FLOATP (val))
    {
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      f[XLFD_PIXEL_INDEX] = alloca (12);
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      i = XFLOAT_DATA (val) * 10;
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      len += sprintf (f[XLFD_PIXEL_INDEX], "*-%d", i) + 1;
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    }
  else
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    f[XLFD_PIXEL_INDEX] = "*-*", len += 4;

  val = AREF (font, FONT_EXTRA_INDEX);
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  if (FONT_ENTITY_P (font)
      && EQ (AREF (font, FONT_TYPE_INDEX), Qx))
    {
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      /* Setup names for RESX-RESY-SPACING-AVWIDTH.  */
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      if (SYMBOLP (val) && ! NILP (val))
	{
	  val = SYMBOL_NAME (val);
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	  f[XLFD_RESX_INDEX] = (char *) SDATA (val), len += SBYTES (val) + 1;
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	}
      else
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	f[XLFD_RESX_INDEX] = "*-*-*-*", len += 6;
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    }
  else
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    {
      Lisp_Object dpi = assq_no_quit (QCdpi, val);
      Lisp_Object spacing = assq_no_quit (QCspacing, val);
      Lisp_Object scalable = assq_no_quit (QCscalable, val);

      if (CONSP (dpi) || CONSP (spacing) || CONSP (scalable))
	{
	  char *str = alloca (24);
	  int this_len;
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	  if (CONSP (dpi) && INTEGERP (XCDR (dpi)))
	    this_len = sprintf (str, "%d-%d",
				XINT (XCDR (dpi)), XINT (XCDR (dpi)));
	  else
	    this_len = sprintf (str, "*-*");
	  if (CONSP (spacing) && ! NILP (XCDR (spacing)))
	    {
	      val = XCDR (spacing);
	      if (INTEGERP (val))
		{
		  if (XINT (val) < FONT_SPACING_MONO)
		    val = Qp;
		  else if (XINT (val) < FONT_SPACING_CHARCELL)
		    val = Qm;
		  else
		    val = Qc;
		}
	      xassert (SYMBOLP (val));
	      this_len += sprintf (str + this_len, "-%c",
				   SDATA (SYMBOL_NAME (val))[0]);
	    }
	  else
	    this_len += sprintf (str + this_len, "-*");
	  if (CONSP (scalable) && ! NILP (XCDR (spacing)))
	    this_len += sprintf (str + this_len, "-0");
	  else
	    this_len += sprintf (str + this_len, "-*");
	  f[XLFD_RESX_INDEX] = str;
	  len += this_len;
	}
      else
	f[XLFD_RESX_INDEX] = "*-*-*-*", len += 8;
    }

  len++;	/* for terminating '\0'.  */
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  if (len >= nbytes)
    return -1;
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  return sprintf (name, "-%s-%s-%s-%s-%s-%s-%s-%s-%s",
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		  f[XLFD_FOUNDRY_INDEX], f[XLFD_FAMILY_INDEX],
		  f[XLFD_WEIGHT_INDEX], f[XLFD_SLANT_INDEX],
		  f[XLFD_SWIDTH_INDEX],
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		  f[XLFD_ADSTYLE_INDEX], f[XLFD_PIXEL_INDEX],
		  f[XLFD_RESX_INDEX], f[XLFD_REGISTRY_INDEX]);
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}

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/* Parse NAME (null terminated) as Fonconfig's name format and store
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   information in FONT (font-spec or font-entity).  If NAME is
   successfully parsed, return 0.  Otherwise return -1.  */
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int
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font_parse_fcname (name, font)
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     char *name;
     Lisp_Object font;
{
  char *p0, *p1;
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  int len = strlen (name);
  char *copy;
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  int weight_set = 0;
  int slant_set = 0;
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  if (len == 0)
    return -1;
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  /* It is assured that (name[0] && name[0] != '-').  */
  if (name[0] == ':')
    p0 = name;
  else
    {
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      Lisp_Object family;
      double point_size;

      for (p0 = name + 1; *p0 && (*p0 != '-' && *p0 != ':'); p0++)
	if (*p0 == '\\' && p0[1])
	  p0++;
      family = intern_font_field (name, p0 - name);
      if (*p0 == '-')
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	{
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	  if (! isdigit (p0[1]))
	    return -1;
	  point_size = strtod (p0 + 1, &p1);
	  if (*p1 && *p1 != ':')
	    return -1;
	  ASET (font, FONT_SIZE_INDEX, make_float (point_size));
	  p0 = p1;
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	}
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      ASET (font, FONT_FAMILY_INDEX, family);
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    }
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  len -= p0 - name;
  copy = alloca (len + 1);
  if (! copy)
    return -1;
  name = copy;
  
  /* Now parse ":KEY=VAL" patterns.  Store known keys and values in
     extra, copy unknown ones to COPY.  */
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  while (*p0)
    {
      Lisp_Object key, val;
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      int prop;
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      for (p1 = p0 + 1; *p1 && *p1 != '=' && *p1 != ':'; p1++);
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      if (*p1 != '=')
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	{
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	  /* Must be an enumerated value.  */
	  val = intern_font_field (p0 + 1, p1 - p0 - 1);
	  if (memcmp (p0 + 1, "light", 5) == 0
	      || memcmp (p0 + 1, "medium", 6) == 0
	      || memcmp (p0 + 1, "demibold", 8) == 0
	      || memcmp (p0 + 1, "bold", 4) == 0
	      || memcmp (p0 + 1, "black", 5) == 0)
	    {
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	      ASET (font, FONT_WEIGHT_INDEX, val);
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              weight_set = 1;
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	    }
	  else if (memcmp (p0 + 1, "roman", 5) == 0
		   || memcmp (p0 + 1, "italic", 6) == 0
		   || memcmp (p0 + 1, "oblique", 7) == 0)
	    {
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	      ASET (font, FONT_SLANT_INDEX, val);
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              slant_set = 1;
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	    }
	  else if (memcmp (p0 + 1, "charcell", 8) == 0
		   || memcmp (p0 + 1, "mono", 4) == 0
		   || memcmp (p0 + 1, "proportional", 12) == 0)
	    {
	      font_put_extra (font, QCspacing,
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			      (p0[1] == 'c' ? Qc : p0[1] == 'm' ? Qm : Qp));
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	    }
	  else
	    {
	      /* unknown key */
	      bcopy (p0, copy, p1 - p0);
	      copy += p1 - p0;
	    }
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	}
      else
	{
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	  if (memcmp (p0 + 1, "pixelsize=", 10) == 0)
	    prop = FONT_SIZE_INDEX;
	  else
	    {
	      key = intern_font_field (p0, p1 - p0);
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	      prop = get_font_prop_index (key, 0);
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	    }
	  p0 = p1 + 1;
	  for (p1 = p0; *p1 && *p1 != ':'; p1++);
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	  val = intern_font_field (p0, p1 - p0);
	  if (! NILP (val))
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	    {
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	      if (prop >= 0 && prop < FONT_EXTRA_INDEX)
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		{
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                  if (prop == FONT_WEIGHT_INDEX)
                    weight_set = 1;
                  else if (prop == FONT_SLANT_INDEX)
                    slant_set = 1;

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		  ASET (font, prop, val);
		}
	      else
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		font_put_extra (font, key, val);
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	    }
	}
      p0 = p1;
    }
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  if (!weight_set)
    ASET (font, FONT_WEIGHT_INDEX, build_string ("normal"));
  if (!slant_set)
    ASET (font, FONT_SLANT_INDEX, build_string ("normal"));

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  return 0;
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}

/* Store fontconfig's font 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_fcname (font, pixel_size, name, nbytes)
     Lisp_Object font;
     int pixel_size;
     char *name;
     int nbytes;
{
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  Lisp_Object val;
  int point_size;
  int dpi, spacing, scalable;
  int i, len = 1;
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  char *p;
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  Lisp_Object styles[3];
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  char *style_names[3] = { "weight", "slant", "width" };
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  val = AREF (font, FONT_FAMILY_INDEX);
  if (SYMBOLP (val) && ! NILP (val))
    len += SBYTES (SYMBOL_NAME (val));

  val = AREF (font, FONT_SIZE_INDEX);
  if (INTEGERP (val))
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    {
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      if (XINT (val) != 0)
	pixel_size = XINT (val);
      point_size = -1;
      len += 21;		/* for ":pixelsize=NUM" */
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    }
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  else if (FLOATP (val))
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    {
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      pixel_size = -1;
      point_size = (int) XFLOAT_DATA (val);
      len += 11;		/* for "-NUM" */
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    }
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  val = AREF (font, FONT_FOUNDRY_INDEX);
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  if (SYMBOLP (val) && ! NILP (val))
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    /* ":foundry=NAME" */
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    len += 9 + SBYTES (SYMBOL_NAME (val));

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  for (i = FONT_WEIGHT_INDEX; i <= FONT_WIDTH_INDEX; i++)
    {
      val = AREF (font, i);
      if (INTEGERP (val))
	{
	  val = prop_numeric_to_name (i, XINT (val));
	  len += (strlen (style_names[i - FONT_WEIGHT_INDEX])
		  + 2 + SBYTES (SYMBOL_NAME (val))); /* :xxx=NAME */
	}
      styles[i - FONT_WEIGHT_INDEX] = val;
    }