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/* font.c -- "Font" primitives.
   Copyright (C) 2006 Free Software Foundation, Inc.
   Copyright (C) 2006
     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
the Free Software Foundation; either version 2, or (at your option)
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>

#include "lisp.h"
#include "buffer.h"
#include "frame.h"
#include "dispextern.h"
#include "charset.h"
#include "character.h"
#include "composite.h"
#include "fontset.h"
#include "font.h"

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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;

Lisp_Object Qfontp;

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/* Important character set symbols.  */
Lisp_Object Qiso8859_1, Qiso10646_1, Qunicode_bmp;

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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
   style properties (weight, slant, width).  The alist contains a
   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;
/* Symbols representing values of font spacing property.  */
Lisp_Object Qc, Qm, Qp, Qd;
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/* List of all font drivers.  All font-backends (XXXfont.c) call
   add_font_driver in syms_of_XXXfont to register the font-driver
   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);
  val = assq_no_quit (extra, QCdpi);
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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;

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);
    }
}


/* Font property validater.  */

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static Lisp_Object font_prop_validate_symbol P_ ((enum font_property_index,
						  Lisp_Object, Lisp_Object));
static Lisp_Object font_prop_validate_style P_ ((enum font_property_index,
						 Lisp_Object, Lisp_Object));
static Lisp_Object font_prop_validate_non_neg P_ ((enum font_property_index,
						   Lisp_Object, Lisp_Object));
static Lisp_Object font_prop_validate_spacing P_ ((enum font_property_index,
						   Lisp_Object, Lisp_Object));
static int get_font_prop_index P_ ((Lisp_Object, int));
static Lisp_Object font_prop_validate P_ ((Lisp_Object));
static Lisp_Object font_put_extra P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
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static Lisp_Object
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font_prop_validate_symbol (prop_index, prop, val)
     enum font_property_index prop_index;
     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_index, prop, val)
     enum font_property_index prop_index;
     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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	  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_index, prop, val)
     enum font_property_index prop_index;
     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_index, prop, val)
     enum font_property_index prop_index;
     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;
}

/* 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 the value VAL, or NULL if any value is ok.  */
  Lisp_Object (*validater) P_ ((enum font_property_index prop_index,
				Lisp_Object prop, Lisp_Object val));
} 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 },
    { &QCotf, font_prop_validate_symbol }
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  };

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#define FONT_PROPERTY_TABLE_SIZE \
  ((sizeof font_property_table) / (sizeof *font_property_table))

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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}

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;
	  val = (font_property_table[i].validater) (i, 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)
	{
	  val = (font_property_table[i].validater) (i, prop, XCDR (elt));
	  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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static Lisp_Object
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;
  char *f[XLFD_LAST_INDEX];
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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 			/* i == 0 */
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	len += sprintf (f[XLFD_PIXEL_INDEX], "%d-*", pixel_size) + 1;
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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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  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;
1138
	}
1139
      ASET (font, FONT_FAMILY_INDEX, family);
1140
    }
1141 1142 1143 1144 1145 1146 1147 1148 1149

  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.  */
1150 1151 1152
  while (*p0)
    {
      Lisp_Object key, val;
1153
      int prop;
1154

1155
      for (p1 = p0 + 1; *p1 && *p1 != '=' && *p1 != ':'; p1++);
1156
      if (*p1 != '=')
1157
	{
1158 1159 1160 1161 1162 1163 1164 1165
	  /* 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)
	    {
1166
	      ASET (font, FONT_WEIGHT_INDEX, val);
1167 1168 1169 1170 1171
	    }
	  else if (memcmp (p0 + 1, "roman", 5) == 0
		   || memcmp (p0 + 1, "italic", 6) == 0
		   || memcmp (p0 + 1, "oblique", 7) == 0)
	    {
1172
	      ASET (font, FONT_SLANT_INDEX, val);
1173 1174 1175 1176 1177 1178
	    }
	  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,
1179
			      (p0[1] == 'c' ? Qc : p0[1] == 'm' ? Qm : Qp));
1180 1181 1182 1183 1184 1185 1186
	    }
	  else
	    {
	      /* unknown key */
	      bcopy (p0, copy, p1 - p0);
	      copy += p1 - p0;
	    }
1187 1188 1189
	}
      else
	{
1190 1191
	  char *pbeg = p0; 

1192 1193 1194 1195 1196
	  if (memcmp (p0 + 1, "pixelsize=", 10) == 0)
	    prop = FONT_SIZE_INDEX;
	  else
	    {
	      key = intern_font_field (p0, p1 - p0);
1197
	      prop = get_font_prop_index (key, 0);
1198 1199 1200
	    }
	  p0 = p1 + 1;
	  for (p1 = p0; *p1 && *p1 != ':'; p1++);
1201 1202
	  val = intern_font_field (p0, p1 - p0);
	  if (! NILP (val))
1203
	    {
1204
	      if (prop >= 0 && prop < FONT_EXTRA_INDEX)
1205
		{
1206 1207 1208 1209 1210 1211 1212 1213 1214
		  ASET (font, prop, val);
		}
	      else if (prop > 0)
		font_put_extra (font, key, val);
	      else
		{
		  /* Unknown attribute, keep it in name.  */
		  bcopy (pbeg, copy, p1 - pbeg);
		  copy += p1 - pbeg;
1215 1216 1217 1218 1219
		}
	    }
	}
      p0 = p1;
    }
1220 1221

  if (name < copy)
1222
    font_put_extra (font, QCname, make_unibyte_string (name, copy - name));
1223

1224
  return 0;
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
}

/* 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;
{
1238 1239 1240 1241
  Lisp_Object val;
  int point_size;
  int dpi, spacing, scalable;
  int i, len = 1;
1242
  char *p;
1243 1244
  Lisp_Object styles[3];
  char *style_names[3] = { "weight", "slant", "swidth" };
1245

1246 1247 1248 1249 1250 1251
  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))
1252
    {
1253 1254 1255 1256
      if (XINT (val) != 0)
	pixel_size = XINT (val);
      point_size = -1;
      len += 21;		/* for ":pixelsize=NUM" */
1257
    }
1258
  else if (FLOATP (val))
1259
    {
1260 1261 1262
      pixel_size = -1;
      point_size = (int) XFLOAT_DATA (val);
      len += 11;		/* for "-NUM" */
1263
    }
1264 1265 1266

  val = AREF (font, FONT_FOUNDRY_INDEX);
  if (! NILP (val))
1267
    /* ":foundry=NAME" */