ftfont.c 46.7 KB
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/* ftfont.c -- FreeType font driver.
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   Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
   Copyright (C) 2006, 2007, 2008
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     National Institute of Advanced Industrial Science and Technology (AIST)
     Registration Number H13PRO009

This file is part of GNU Emacs.

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

You should have received a copy of the GNU General Public License
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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#include <config.h>
#include <stdio.h>

#include <fontconfig/fontconfig.h>
#include <fontconfig/fcfreetype.h>

#include "lisp.h"
#include "dispextern.h"
#include "frame.h"
#include "blockinput.h"
#include "character.h"
#include "charset.h"
#include "coding.h"
#include "fontset.h"
#include "font.h"
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#include "ftfont.h"
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/* Symbolic type of this font-driver.  */
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Lisp_Object Qfreetype;

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/* Fontconfig's generic families and their aliases.  */
static Lisp_Object Qmonospace, Qsans_serif, Qserif, Qmono, Qsans, Qsans__serif;

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/* Flag to tell if FcInit is areadly called or not.  */
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static int fc_initialized;
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/* Handle to a FreeType library instance.  */
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static FT_Library ft_library;

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/* Cache for FreeType fonts.  */
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static Lisp_Object freetype_font_cache;

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/* Cache for FT_Face */
static Lisp_Object ft_face_cache;
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/* The actual structure for FreeType font that can be casted to struct
   font.  */

struct ftfont_info
{
  struct font font;
  FT_Size ft_size;
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  int fc_charset_idx;
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#ifdef HAVE_LIBOTF
  int maybe_otf;	/* Flag to tell if this may be OTF or not.  */
  OTF *otf;
#endif	/* HAVE_LIBOTF */
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};

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static Lisp_Object ftfont_pattern_entity P_ ((FcPattern *, Lisp_Object, int));

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static Lisp_Object ftfont_resolve_generic_family P_ ((Lisp_Object));
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Lisp_Object ftfont_font_format P_ ((FcPattern *));
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#define SYMBOL_FcChar8(SYM) (FcChar8 *) SDATA (SYMBOL_NAME (SYM))

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static struct
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{
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  /* charset name */
  char *name;
  /* characters to distinguish the charset from the others */
  int uniquifier[6];
  /* set in syms_of_ftfont */
  int charset_id;
  /* set on demand */
  FcCharSet *fc_charset;
} fc_charset_table[] =
  { { "iso-8859-1", { 0x00A0, 0x00A1, 0x00B4, 0x00BC, 0x00D0 }, -1 },
    { "iso-8859-2", { 0x00A0, 0x010E }},
    { "iso-8859-3", { 0x00A0, 0x0108 }},
    { "iso-8859-4", { 0x00A0, 0x00AF, 0x0128, 0x0156, 0x02C7 }},
    { "iso-8859-5", { 0x00A0, 0x0401 }},
    { "iso-8859-6", { 0x00A0, 0x060C }},
    { "iso-8859-7", { 0x00A0, 0x0384 }},
    { "iso-8859-8", { 0x00A0, 0x05D0 }},
    { "iso-8859-9", { 0x00A0, 0x00A1, 0x00BC, 0x011E }},
    { "iso-8859-10", { 0x00A0, 0x00D0, 0x0128, 0x2015 }},
    { "iso-8859-11", { 0x00A0, 0x0E01 }},
    { "iso-8859-13", { 0x00A0, 0x201C }},
    { "iso-8859-14", { 0x00A0, 0x0174 }},
    { "iso-8859-15", { 0x00A0, 0x00A1, 0x00D0, 0x0152 }},
    { "iso-8859-16", { 0x00A0, 0x0218}},
    { "chinese-gb2312", { 0x4E13 }},
    { "big5", { 0xF6B1 }},
    { "japanese-jisx0208", { 0x4E55 }},
    { "korean-ksc5601", { 0xAC00 }},
    { "chinese-cns11643-1", { 0xFE32 }},
    { "chinese-cns11643-2", { 0x4E33, 0x7934 }},
    { "chinese-cns11643-3", { 0x201A9 }},
    { "chinese-cns11643-4", { 0x20057 }},
    { "chinese-cns11643-5", { 0x20000 }},
    { "chinese-cns11643-6", { 0x20003 }},
    { "chinese-cns11643-7", { 0x20055 }},
    { "chinese-gbk", { 0x4E06 }},
    { "japanese-jisx0212", { 0x4E44 }},
    { "japanese-jisx0213-1", { 0xFA10 }},
    { "japanese-jisx0213-2", { 0xFA49 }},
    { "japanese-jisx0213.2004-1", { 0x20B9F }},
    { "viscii", { 0x1EA0, 0x1EAE, 0x1ED2 }},
    { "tis620", { 0x0E01 }},
    { "windows-1251", { 0x0401, 0x0490 }},
    { "koi8-r", { 0x0401, 0x2219 }},
    { "mule-lao", { 0x0E81 }},
    { NULL }
  };
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extern Lisp_Object Qc, Qm, Qp, Qd;

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static Lisp_Object
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ftfont_pattern_entity (p, registry, fc_charset_idx)
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     FcPattern *p;
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     Lisp_Object registry;
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     int fc_charset_idx;
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{
  Lisp_Object entity;
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  char *file, *str;
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  int numeric;
  double dbl;
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  FcBool b;
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  if (FcPatternGetString (p, FC_FILE, 0, (FcChar8 **) &file) != FcResultMatch)
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    return Qnil;

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  entity = font_make_entity ();
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  ASET (entity, FONT_TYPE_INDEX, Qfreetype);
  ASET (entity, FONT_REGISTRY_INDEX, registry);

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  if (FcPatternGetString (p, FC_FOUNDRY, 0, (FcChar8 **) &str) == FcResultMatch)
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    ASET (entity, FONT_FOUNDRY_INDEX, font_intern_prop (str, strlen (str)));
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  if (FcPatternGetString (p, FC_FAMILY, 0, (FcChar8 **) &str) == FcResultMatch)
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    ASET (entity, FONT_FAMILY_INDEX, font_intern_prop (str, strlen (str)));
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  if (FcPatternGetInteger (p, FC_WEIGHT, 0, &numeric) == FcResultMatch)
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    {
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      if (numeric >= FC_WEIGHT_REGULAR && numeric < FC_WEIGHT_MEDIUM)
	numeric = FC_WEIGHT_MEDIUM;
      FONT_SET_STYLE (entity, FONT_WEIGHT_INDEX, make_number (numeric));
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    }
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  if (FcPatternGetInteger (p, FC_SLANT, 0, &numeric) == FcResultMatch)
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    {
      numeric += 100;
      FONT_SET_STYLE (entity, FONT_SLANT_INDEX, make_number (numeric));
    }
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  if (FcPatternGetInteger (p, FC_WIDTH, 0, &numeric) == FcResultMatch)
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    {
      FONT_SET_STYLE (entity, FONT_WIDTH_INDEX, make_number (numeric));
    }
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  if (FcPatternGetDouble (p, FC_PIXEL_SIZE, 0, &dbl) == FcResultMatch)
    ASET (entity, FONT_SIZE_INDEX, make_number (dbl));
  else
    ASET (entity, FONT_SIZE_INDEX, make_number (0));
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  if (FcPatternGetInteger (p, FC_SPACING, 0, &numeric) == FcResultMatch)
    ASET (entity, FONT_SPACING_INDEX, make_number (numeric));
  if (FcPatternGetDouble (p, FC_DPI, 0, &dbl) == FcResultMatch)
    {
      int dpi = dbl;
      ASET (entity, FONT_DPI_INDEX, make_number (dpi));
    }
  if (FcPatternGetBool (p, FC_SCALABLE, 0, &b) == FcResultMatch
      && b == FcTrue)
    ASET (entity, FONT_AVGWIDTH_INDEX, make_number (0));
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  font_put_extra (entity, QCfont_entity,
		  Fcons (make_unibyte_string ((char *) file,
					      strlen ((char *) file)),
			 make_number (fc_charset_idx)));
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  return entity;
}

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static Lisp_Object ftfont_generic_family_list;

static Lisp_Object
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ftfont_resolve_generic_family (family)
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     Lisp_Object family;
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{
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  Lisp_Object slot;
  FcPattern *pattern = NULL, *match;
  FcResult result;
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  family = Fintern (Fdowncase (SYMBOL_NAME (family)), Qnil);
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  if (EQ (family, Qmono))
    family = Qmonospace;
  else if (EQ (family, Qsans) || EQ (family, Qsans__serif))
    family = Qsans_serif;
  slot = assq_no_quit (family, ftfont_generic_family_list);
  if (! CONSP (slot))
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    return Qnil;
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  if (! EQ (XCDR (slot), Qt))
    return XCDR (slot);
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  pattern = FcPatternBuild (NULL, FC_FAMILY, FcTypeString,
			    SYMBOL_FcChar8 (family), (char *) 0);
  if (! pattern)
    goto err;
  FcConfigSubstitute (NULL, pattern, FcMatchPattern);
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  FcDefaultSubstitute (pattern);
  match = FcFontMatch (NULL, pattern, &result);
  if (match)
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    {
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      FcChar8 *fam;

      if (FcPatternGetString (match, FC_FAMILY, 0, &fam) == FcResultMatch)
	family = intern ((char *) fam);
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    }
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  else
    family = Qnil;
  XSETCDR (slot, family);
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 err:
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  if (match) FcPatternDestroy (match);
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  if (pattern) FcPatternDestroy (pattern);
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  return family;
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}

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Lisp_Object
ftfont_lookup_cache (filename)
     Lisp_Object filename;
{
  Lisp_Object cache, val;

  cache = assoc_no_quit (filename, ft_face_cache);
  if (NILP (cache))
    {
      val = make_save_value (NULL, 0);
      cache = Fcons (filename, val);
      ft_face_cache = Fcons (cache, ft_face_cache);
    }
  else
    val = XCDR (cache);
  if (! XSAVE_VALUE (val)->pointer)
    {
      FT_Face ft_face;

      if (! ft_library
	  && FT_Init_FreeType (&ft_library) != 0)
	return Qnil;
      if (FT_New_Face (ft_library, (char *) SDATA (filename), 0, &ft_face) != 0)
	return Qnil;
      XSAVE_VALUE (val)->pointer = ft_face;
    }
  return cache;
}

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static Lisp_Object ftfont_get_cache P_ ((FRAME_PTR));
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static Lisp_Object ftfont_list P_ ((Lisp_Object, Lisp_Object));
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static Lisp_Object ftfont_match P_ ((Lisp_Object, Lisp_Object));
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static Lisp_Object ftfont_list_family P_ ((Lisp_Object));
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static Lisp_Object ftfont_open P_ ((FRAME_PTR, Lisp_Object, int));
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static void ftfont_close P_ ((FRAME_PTR, struct font *));
static int ftfont_has_char P_ ((Lisp_Object, int));
static unsigned ftfont_encode_char P_ ((struct font *, int));
static int ftfont_text_extents P_ ((struct font *, unsigned *, int,
				    struct font_metrics *));
static int ftfont_get_bitmap P_ ((struct font *, unsigned,
				  struct font_bitmap *, int));
static int ftfont_anchor_point P_ ((struct font *, unsigned, int,
				    int *, int *));
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static Lisp_Object ftfont_shape P_ ((Lisp_Object));
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struct font_driver ftfont_driver =
  {
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    0,				/* Qfreetype */
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    0,				/* case insensitive */
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    ftfont_get_cache,
    ftfont_list,
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    ftfont_match,
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    ftfont_list_family,
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    NULL,
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    ftfont_open,
    ftfont_close,
    /* We can't draw a text without device dependent functions.  */
    NULL,
    NULL,
    ftfont_has_char,
    ftfont_encode_char,
    ftfont_text_extents,
    /* We can't draw a text without device dependent functions.  */
    NULL,
    ftfont_get_bitmap,
    NULL,
    NULL,
    NULL,
    ftfont_anchor_point,
    NULL,
    NULL,
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    NULL,
    NULL,
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#if defined (HAVE_M17N_FLT) && defined (HAVE_LIBOTF)
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    ftfont_shape
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#else  /* not (HAVE_M17N_FLT && HAVE_LIBOTF) */
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    NULL
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#endif	/* not (HAVE_M17N_FLT && HAVE_LIBOTF) */
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  };

extern Lisp_Object QCname;

static Lisp_Object
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ftfont_get_cache (f)
     FRAME_PTR f;
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{
  return freetype_font_cache;
}

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static int
ftfont_get_charset (registry)
     Lisp_Object registry;
{
  struct charset *encoding;
  int i, j;

  if (font_registry_charsets (registry, &encoding, NULL) < 0)
    return -1;
  if (fc_charset_table[0].charset_id < 0)
    /* Setup charset_id field of all elements.  */
    for (i = 0; fc_charset_table[i].name; i++)
      {
	Lisp_Object sym = intern (fc_charset_table[i].name);

	if (CHARSETP (sym))
	  fc_charset_table[i].charset_id = XINT (CHARSET_SYMBOL_ID (sym));
	else
	  fc_charset_table[i].charset_id = -1;
      }

  for (i = 0; fc_charset_table[i].name; i++)
    if (encoding->id == fc_charset_table[i].charset_id)
      break;
  if (! fc_charset_table[i].name)
    return -1;
  if (! fc_charset_table[i].fc_charset)
    {
      FcCharSet *charset = FcCharSetCreate ();
      int *uniquifier = fc_charset_table[i].uniquifier;

      if (! charset)
	return -1;
      for (j = 0; uniquifier[j]; j++)
	if (! FcCharSetAddChar (charset, uniquifier[j]))
	  {
	    FcCharSetDestroy (charset);
	    return -1;
	  }
      fc_charset_table[i].fc_charset = charset;      
    }
  return i;
}

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struct OpenTypeSpec
{
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  Lisp_Object script;
  unsigned int script_tag, langsys_tag;
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  int nfeatures[2];
  unsigned int *features[2];
};

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#define OTF_SYM_TAG(SYM, TAG)					\
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  do {								\
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    unsigned char *p = SDATA (SYMBOL_NAME (SYM));		\
    TAG = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];	\
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  } while (0)

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#define OTF_TAG_STR(TAG, P)			\
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  do {						\
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    (P)[0] = (char) (TAG >> 24);		\
    (P)[1] = (char) ((TAG >> 16) & 0xFF);	\
    (P)[2] = (char) ((TAG >> 8) & 0xFF);	\
    (P)[3] = (char) (TAG & 0xFF);		\
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    (P)[4] = '\0';				\
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  } while (0)

static struct OpenTypeSpec *
ftfont_get_open_type_spec (Lisp_Object otf_spec)
{
  struct OpenTypeSpec *spec = malloc (sizeof (struct OpenTypeSpec));
  Lisp_Object val;
  int i, j, negative;

  if (! spec)
    return NULL;
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  spec->script = XCAR (otf_spec);
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  if (! NILP (spec->script))
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    {
      OTF_SYM_TAG (spec->script, spec->script_tag);
      val = assq_no_quit (spec->script, Votf_script_alist);
      if (CONSP (val) && SYMBOLP (XCDR (val)))
	spec->script = XCDR (val);
      else
	spec->script = Qnil;
    }
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  else
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    spec->script_tag = 0x44464C54; 	/* "DFLT" */
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  otf_spec = XCDR (otf_spec);
  val = XCAR (otf_spec);
  if (! NILP (val))
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    OTF_SYM_TAG (val, spec->langsys_tag);
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  else
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    spec->langsys_tag = 0;
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  spec->nfeatures[0] = spec->nfeatures[1] = 0;
  for (i = 0; i < 2; i++)
    {
      Lisp_Object len;

      otf_spec = XCDR (otf_spec);    
      if (NILP (otf_spec))
	break;
      val = XCAR (otf_spec);
      if (NILP (val))
	continue;
      len = Flength (val);
      spec->features[i] = malloc (sizeof (int) * XINT (len));
      if (! spec->features[i])
	{
	  if (i > 0 && spec->features[0])
	    free (spec->features[0]);
	  free (spec);
	  return NULL;
	}
      for (j = 0, negative = 0; CONSP (val); val = XCDR (val))
	{
	  if (NILP (XCAR (val)))
	    negative = 1;
	  else
	    {
	      unsigned int tag;

	      OTF_SYM_TAG (XCAR (val), tag);
	      spec->features[i][j++] = negative ? tag & 0x80000000 : tag;
	    }
	}
      spec->nfeatures[i] = j;
    }
  return spec;
}

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static FcPattern *ftfont_spec_pattern P_ ((Lisp_Object, int *, char *,
					   struct OpenTypeSpec **));

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static FcPattern *
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ftfont_spec_pattern (spec, fc_charset_idx, otlayout, otspec)
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     Lisp_Object spec;
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     int *fc_charset_idx;
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     char *otlayout;
     struct OpenTypeSpec **otspec;
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{
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  Lisp_Object tmp, extra;
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  FcPattern *pattern = NULL;
  FcCharSet *charset = NULL;
  FcLangSet *langset = NULL;
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  int n;
  int dpi = -1;
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  int spacing = -1;
  int scalable = -1;
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  Lisp_Object name = Qnil;
  Lisp_Object script = Qnil;
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  Lisp_Object registry;
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  if (! NILP (AREF (spec, FONT_ADSTYLE_INDEX))
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      && SBYTES (SYMBOL_NAME (AREF (spec, FONT_ADSTYLE_INDEX))) > 0)
    /* Fontconfig doesn't support adstyle property.  */
    return NULL;
  if ((n = FONT_SLANT_NUMERIC (spec)) >= 0
      && n < 100)
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    /* Fontconfig doesn't support reverse-italic/obligue.  */
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    return NULL;

  if (INTEGERP (AREF (spec, FONT_DPI_INDEX)))
    dpi = XINT (AREF (spec, FONT_DPI_INDEX));
  if (INTEGERP (AREF (spec, FONT_SPACING_INDEX)))
    spacing = XINT (AREF (spec, FONT_SPACING_INDEX));
  if (INTEGERP (AREF (spec, FONT_AVGWIDTH_INDEX))
      && XINT (AREF (spec, FONT_AVGWIDTH_INDEX)) == 0)
    scalable = 1;
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  registry = AREF (spec, FONT_REGISTRY_INDEX);
  if (NILP (registry)
      || EQ (registry, Qiso10646_1)
      || EQ (registry, Qunicode_bmp)
      || EQ (registry, Qunicode_sip))
    *fc_charset_idx = -1;
  else
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    {
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      *fc_charset_idx = ftfont_get_charset (registry);
      if (*fc_charset_idx < 0)
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	return NULL;
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      charset = fc_charset_table[*fc_charset_idx].fc_charset;
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    }

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  otlayout[0] = '\0';
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  for (extra = AREF (spec, FONT_EXTRA_INDEX);
       CONSP (extra); extra = XCDR (extra))
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    {
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      Lisp_Object key, val;

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      key = XCAR (XCAR (extra)), val = XCDR (XCAR (extra));
      if (EQ (key, QCdpi))
	dpi = XINT (val);
      else if (EQ (key, QCfc_unknown_spec))
	name = val;
      else if (EQ (key, QClang))
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	{
	  langset = FcLangSetCreate ();
	  if (! langset)
	    goto err;
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	  if (SYMBOLP (val))
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	    {
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	      if (! FcLangSetAdd (langset, SYMBOL_FcChar8 (val)))
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		goto err;
	    }
	  else
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	    for (; CONSP (val); val = XCDR (val))
	      if (SYMBOLP (XCAR (val))
		  && ! FcLangSetAdd (langset, SYMBOL_FcChar8 (XCAR (val))))
		goto err;
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	}
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      else if (EQ (key, QCname))
	name = val;
      else if (EQ (key, QCotf))
	{
	  *otspec = ftfont_get_open_type_spec (val);
	  if (! *otspec)
	    return NULL;
	  strcat (otlayout, "otlayout:");
	  OTF_TAG_STR ((*otspec)->script_tag, otlayout + 9);
	  script = (*otspec)->script;
	}
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      else if (EQ (key, QCscript))
	script = val;
      else if (EQ (key, QCscalable))
	scalable = ! NILP (val);
    }
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  if (! NILP (script) && ! charset)
    {
      Lisp_Object chars = assq_no_quit (script, Vscript_representative_chars);

      if (CONSP (chars))
	{
	  charset = FcCharSetCreate ();
	  if (! charset)
	    goto err;
	  for (chars = XCDR (chars); CONSP (chars); chars = XCDR (chars))
	    if (CHARACTERP (XCAR (chars))
		&& ! FcCharSetAddChar (charset, XUINT (XCAR (chars))))
	      goto err;
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	}
    }

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  pattern = NILP (name) ? FcPatternCreate () : FcNameParse (SDATA (name));
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  if (! pattern)
    goto err;
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  FcPatternDel (pattern, FC_SIZE);
  FcPatternDel (pattern, FC_PIXEL_SIZE);
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  FcPatternDel (pattern, FC_FOUNDRY);
  FcPatternDel (pattern, FC_FAMILY);
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  tmp = AREF (spec, FONT_FOUNDRY_INDEX);
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  if (! NILP (tmp)
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      && ! FcPatternAddString (pattern, FC_FOUNDRY, SYMBOL_FcChar8 (tmp)))
    goto err;
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  tmp = AREF (spec, FONT_FAMILY_INDEX);
  if (! NILP (tmp)
      && ! FcPatternAddString (pattern, FC_FAMILY, SYMBOL_FcChar8 (tmp)))
    goto err;
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  if (charset
      && ! FcPatternAddCharSet (pattern, FC_CHARSET, charset))
    goto err;
  if (langset
      && ! FcPatternAddLangSet (pattern, FC_LANG, langset))
    goto err;
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  if (dpi >= 0
      && ! FcPatternAddDouble (pattern, FC_DPI, dpi))
    goto err;
  if (spacing >= 0
      && ! FcPatternAddInteger (pattern, FC_SPACING, spacing))
    goto err;
  if (scalable >= 0
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      && ! FcPatternAddBool (pattern, FC_SCALABLE, scalable ? FcTrue : FcFalse))
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    goto err;
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  goto finish;
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 err:
  /* We come here because of unexpected error in fontconfig API call
     (usually insufficient memory).  */
  if (pattern)
    {
      FcPatternDestroy (pattern);
      pattern = NULL;
    }
  if (*otspec)
    {
      if ((*otspec)->nfeatures[0] > 0)
	free ((*otspec)->features[0]);
      if ((*otspec)->nfeatures[1] > 0)
	free ((*otspec)->features[1]);
      free (*otspec);
      *otspec = NULL;
    }

 finish:
  if (langset) FcLangSetDestroy (langset);
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  if (charset && *fc_charset_idx < 0) FcCharSetDestroy (charset);
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  return pattern;
}

static Lisp_Object
ftfont_list (frame, spec)
     Lisp_Object frame, spec;
{
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  Lisp_Object val = Qnil, registry, family;
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  int i;
  FcPattern *pattern;
  FcFontSet *fontset = NULL;
  FcObjectSet *objset = NULL;
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  int fc_charset_idx;
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  char otlayout[15];		/* For "otlayout:XXXX" */
  struct OpenTypeSpec *otspec = NULL;
  
  if (! fc_initialized)
    {
      FcInit ();
      fc_initialized = 1;
    }

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  pattern = ftfont_spec_pattern (spec, &fc_charset_idx, otlayout, &otspec);
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  if (! pattern)
    return Qnil;
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  registry = AREF (spec, FONT_REGISTRY_INDEX);
  family = AREF (spec, FONT_FAMILY_INDEX);
  if (! NILP (family))
    {
      Lisp_Object resolved;

      resolved = ftfont_resolve_generic_family (family);
      if (! NILP (resolved))
	{
	  FcPatternDel (pattern, FC_FAMILY);
	  if (! FcPatternAddString (pattern, FC_FAMILY,
				    SYMBOL_FcChar8 (resolved)))
	    goto err;
	}
    }

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  objset = FcObjectSetBuild (FC_FOUNDRY, FC_FAMILY, FC_WEIGHT, FC_SLANT,
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			     FC_WIDTH, FC_PIXEL_SIZE, FC_SPACING, FC_SCALABLE,
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			     FC_CHARSET, FC_FILE,
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#ifdef FC_CAPABILITY
			     FC_CAPABILITY,
#endif	/* FC_CAPABILITY */
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			     NULL);
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  if (! objset)
    goto err;
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  fontset = FcFontList (NULL, pattern, objset);
  if (! fontset)
    goto err;
  for (i = 0; i < fontset->nfont; i++)
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    {
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      Lisp_Object entity;
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#ifdef FC_CAPABILITY
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      if (otlayout[0])
	{
	  FcChar8 *this;
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	  if (FcPatternGetString (fontset->fonts[i], FC_CAPABILITY, 0,
				  &this) != FcResultMatch
	      || ! strstr ((char *) this, otlayout))
	    continue;
	}
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#endif	/* FC_CAPABILITY */
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#ifdef HAVE_LIBOTF
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      if (otspec)
	{
	  FcChar8 *file;
	  OTF *otf;

	  if (FcPatternGetString (fontset->fonts[i], FC_FILE, 0, &file)
	      != FcResultMatch)
	    continue;
	  otf = OTF_open ((char *) file);
	  if (! otf)
	    continue;
	  if (OTF_check_features (otf, 1,
				  otspec->script_tag, otspec->langsys_tag,
				  otspec->features[0],
				  otspec->nfeatures[0]) != 1
	      || OTF_check_features (otf, 0,
				     otspec->script_tag, otspec->langsys_tag,
				     otspec->features[1],
				     otspec->nfeatures[1]) != 1)
	    continue;
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	}
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#endif	/* HAVE_LIBOTF */
      entity = ftfont_pattern_entity (fontset->fonts[i], registry,
				      fc_charset_idx);
      if (! NILP (entity))
	val = Fcons (entity, val);
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    }
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  font_add_log ("ftfont-list", spec, val);
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  goto finish;

 err:
  /* We come here because of unexpected error in fontconfig API call
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     (usually insufficient memory).  */
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  val = Qnil;

 finish:
  if (objset) FcObjectSetDestroy (objset);
  if (fontset) FcFontSetDestroy (fontset);
  if (pattern) FcPatternDestroy (pattern);
  return val;
}

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static Lisp_Object
ftfont_match (frame, spec)
     Lisp_Object frame, spec;
{
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  Lisp_Object entity;
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  FcPattern *pattern, *match = NULL;
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  FcResult result;
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  char otlayout[15];		/* For "otlayout:XXXX" */
  struct OpenTypeSpec *otspec = NULL;
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  int fc_charset_idx;
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  if (! fc_initialized)
    {
      FcInit ();
      fc_initialized = 1;
    }

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  pattern = ftfont_spec_pattern (spec, &fc_charset_idx, otlayout, &otspec);
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  if (! pattern)
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    return Qnil;

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  if (INTEGERP (AREF (spec, FONT_SIZE_INDEX)))
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    {
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      FcValue value;
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      value.type = FcTypeDouble;
      value.u.d = XINT (AREF (spec, FONT_SIZE_INDEX));
      FcPatternAdd (pattern, FC_PIXEL_SIZE, value, FcFalse);
    }
  if (FcConfigSubstitute (NULL, pattern, FcMatchPattern) == FcTrue)
    {
      FcDefaultSubstitute (pattern);
      match = FcFontMatch (NULL, pattern, &result);
      if (match)
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	{
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	  entity = ftfont_pattern_entity (match, Qunicode_bmp, fc_charset_idx);
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	  FcPatternDestroy (match);
	  if (! NILP (AREF (spec, FONT_FAMILY_INDEX))
	      && NILP (assq_no_quit (AREF (spec, FONT_FAMILY_INDEX),
				     ftfont_generic_family_list))
	      && NILP (Fstring_equal (AREF (spec, FONT_FAMILY_INDEX),
				      AREF (entity, FONT_FAMILY_INDEX))))
	    entity = Qnil;
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	}
    }
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  FcPatternDestroy (pattern);
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  font_add_log ("ftfont-match", spec, entity);
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  return entity;
}

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static Lisp_Object
ftfont_list_family (frame)
     Lisp_Object frame;
{
  Lisp_Object list;
  FcPattern *pattern = NULL;
  FcFontSet *fontset = NULL;
  FcObjectSet *objset = NULL;
  int i;

  if (! fc_initialized)
    {
      FcInit ();
      fc_initialized = 1;
    }

  pattern = FcPatternCreate ();
  if (! pattern)
    goto finish;
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  objset = FcObjectSetBuild (FC_FAMILY, NULL);
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  if (! objset)
    goto finish;
  fontset = FcFontList (NULL, pattern, objset);
  if (! fontset)
    goto finish;

  list = Qnil;
  for (i = 0; i < fontset->nfont; i++)
    {
      FcPattern *pat = fontset->fonts[i];
      FcChar8 *str;

      if (FcPatternGetString (pat, FC_FAMILY, 0, &str) == FcResultMatch)
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	list = Fcons (intern ((char *) str), list);
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    }

 finish:
  if (objset) FcObjectSetDestroy (objset);
  if (fontset) FcFontSetDestroy (fontset);
  if (pattern) FcPatternDestroy (pattern);

  return list;
}


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static Lisp_Object
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ftfont_open (f, entity, pixel_size)
     FRAME_PTR f;
     Lisp_Object entity;
     int pixel_size;
{
  struct ftfont_info *ftfont_info;
  struct font *font;
  FT_Face ft_face;
  FT_Size ft_size;
  FT_UInt size;
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  Lisp_Object val, filename, cache, font_object;
  int fc_charset_idx;
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  FcPattern *pattern;
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  int scalable;
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  int spacing;
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  char name[256];
  int i, len;
  int upEM;
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  val = assq_no_quit (QCfont_entity, AREF (entity, FONT_EXTRA_INDEX));
  if (! CONSP (val))
    return Qnil;
  val = XCDR (val);
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  filename = XCAR (val);
  fc_charset_idx = XINT (XCDR (val));
  cache = ftfont_lookup_cache (filename);
  if (NILP (cache))
    return Qnil;
  filename = XCAR (cache);
  val = XCDR (cache);
  ft_face = XSAVE_VALUE (val)->pointer;
  if (XSAVE_VALUE (val)->integer > 0)
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    {
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      /* FT_Face in this cache is already used by the different size.  */
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      if (FT_New_Size (ft_face, &ft_size) != 0)
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	return Qnil;
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      if (FT_Activate_Size (ft_size) != 0)
	{
	  FT_Done_Size (ft_size);
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	  return Qnil;
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	}
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    }
  XSAVE_VALUE (val)->integer++;
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  size = XINT (AREF (entity, FONT_SIZE_INDEX));
  if (size == 0)
    size = pixel_size;
  if (FT_Set_Pixel_Sizes (ft_face, size, size) != 0)
    {
      if (XSAVE_VALUE (val)->integer == 0)
	FT_Done_Face (ft_face);
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      return Qnil;
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    }

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  font_object = font_make_object (VECSIZE (struct ftfont_info));
  ASET (font_object, FONT_TYPE_INDEX, Qfreetype);
  for (i = 1;i < FONT_ENTITY_MAX; i++)
    ASET (font_object, i, AREF (entity, i));
  ASET (font_object, FONT_SIZE_INDEX, make_number (size));
  len = font_unparse_xlfd (entity, size, name, 256);
  if (len > 0)
    ASET (font_object, FONT_NAME_INDEX, make_unibyte_string (name, len));
  len = font_unparse_fcname (entity, size, name, 256);
  if (len > 0)
    ASET (font_object, FONT_FULLNAME_INDEX, make_unibyte_string (name, len));
  else
    ASET (font_object, FONT_FULLNAME_INDEX,
	  AREF (font_object, FONT_NAME_INDEX));
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  ASET (font_object, FONT_FILE_INDEX, filename);
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  ASET (font_object, FONT_FORMAT_INDEX, ftfont_font_format (pattern));
  font = XFONT_OBJECT (font_object);
  ftfont_info = (struct ftfont_info *) font;
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  ftfont_info->ft_size = ft_face->size;
  ftfont_info->fc_charset_idx = fc_charset_idx;
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#ifdef HAVE_LIBOTF
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  ftfont_info->maybe_otf = ft_face->face_flags & FT_FACE_FLAG_SFNT;
  ftfont_info->otf = NULL;
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#endif	/* HAVE_LIBOTF */
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  font->pixel_size = size;
  font->driver = &ftfont_driver;
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  font->encoding_charset = font->repertory_charset = -1;
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  upEM = ft_face->units_per_EM;
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  scalable = (INTEGERP (AREF (entity, FONT_AVGWIDTH_INDEX))
	      && XINT (AREF (entity, FONT_AVGWIDTH_INDEX)) == 0);
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  if (scalable)
    {
      font->ascent = ft_face->ascender * size / upEM;
      font->descent = - ft_face->descender * size / upEM;
      font->height = ft_face->height * size / upEM;
    }
  else
    {
      font->ascent = ft_face->size->metrics.ascender >> 6;
      font->descent = - ft_face->size->metrics.descender >> 6;
      font->height = ft_face->size->metrics.height >> 6;
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    }
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  if (INTEGERP (AREF (entity, FONT_SPACING_INDEX)))
    spacing = XINT (AREF (entity, FONT_SPACING_INDEX));
  else
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    spacing = FC_PROPORTIONAL;
  if (spacing != FC_PROPORTIONAL)
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    font->min_width = font->average_width = font->space_width
      = (scalable ? ft_face->max_advance_width * size / upEM
	 : ft_face->size->metrics.max_advance >> 6);
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  else
    {
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      int n;
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      font->min_width = font->average_width = font->space_width = 0;
      for (i = 32, n = 0; i < 127; i++)
	if (FT_Load_Char (ft_face, i, FT_LOAD_DEFAULT) != 0)
	  {
	    int this_width = ft_face->glyph->metrics.horiAdvance >> 6;

	    if (this_width > 0
		&& (! font->min_width || font->min_width > this_width))
	      font->min_width = this_width;
	    if (i == 32)
	      font->space_width = this_width;
	    font->average_width += this_width;
	    n++;
	  }
      if (n > 0)
	font->average_width /= n;
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    }

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  font->baseline_offset = 0;
  font->relative_compose = 0;
  font->default_ascent = 0;
  font->vertical_centering = 0;
  if (scalable)
    {
      font->underline_position = -ft_face->underline_position * size / upEM;
      font->underline_thickness = -ft_face->underline_thickness * size / upEM;
    }
  else
    {
      font->underline_position = -1;
      font->underline_thickness = 0;
    }
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  return font_object;
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}

static void
ftfont_close (f, font)
     FRAME_PTR f;
     struct font *font;
{
  struct ftfont_info *ftfont_info = (struct ftfont_info *) font;
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  Lisp_Object val, cache;
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  cache = ftfont_lookup_cache (font->props[FONT_FILE_INDEX]);
  val = XCDR (cache);
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  (XSAVE_VALUE (val)->integer)--;
  if (XSAVE_VALUE (val)->integer == 0)
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    {
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      FT_Face ft_face = XSAVE_VALUE (val)->pointer;

      FT_Done_Face (ft_face);
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#ifdef HAVE_LIBOTF
      if (ftfont_info->otf)
	OTF_close (ftfont_info->otf);
#endif
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      XSAVE_VALUE (val)->pointer = NULL;
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    }
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  else
    FT_Done_Size (ftfont_info->ft_size);
}

static int 
ftfont_has_char (entity, c)
     Lisp_Object entity;
     int c;
{
  Lisp_Object val;
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  int fc_charset_idx;
  struct charset *charset;
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  val = assq_no_quit (QCfont_entity, AREF (entity, FONT_EXTRA_INDEX));
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  fc_charset_idx = XINT (XCDR (XCDR (val)));
  if (fc_charset_idx < 0)
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    return -1;
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  charset = CHARSET_FROM_ID (fc_charset_table[fc_charset_idx].charset_id);
  return (ENCODE_CHAR (charset, c) != CHARSET_INVALID_CODE (charset));
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}

static unsigned
ftfont_encode_char (font, c)
     struct font *font;
     int c;
{
  struct ftfont_info *ftfont_info = (struct ftfont_info *) font;
  FT_Face ft_face = ftfont_info->ft_size->face;
  FT_ULong charcode = c;
  FT_UInt code = FT_Get_Char_Index (ft_face, charcode);

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  return (code > 0 ? code : FONT_INVALID_CODE);
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}

static int
ftfont_text_extents (font, code, nglyphs, metrics)
     struct font *font;
     unsigned *code;
     int nglyphs;
     struct font_metrics *metrics;
{
  struct ftfont_info *ftfont_info = (struct ftfont_info *) font;
  FT_Face ft_face = ftfont_info->ft_size->face;
  int width = 0;
  int i;

  if (ftfont_info->ft_size != ft_face->size)
    FT_Activate_Size (ftfont_info->ft_size);
  if (metrics)
    bzero (metrics, sizeof (struct font_metrics));
  for (i = 0; i < nglyphs; i++)
    {
      if (FT_Load_Glyph (ft_face, code[i], FT_LOAD_DEFAULT) == 0)
	{
	  FT_Glyph_Metrics *m = &ft_face->glyph->metrics;

	  if (metrics)
	    {
	      if (metrics->lbearing > width + (m->horiBearingX >> 6))
		metrics->lbearing = width + (m->horiBearingX >> 6);
	      if (metrics->rbearing
		  < width + ((m->horiBearingX + m->width) >> 6))
		metrics->rbearing
		  = width + ((m->horiBearingX + m->width) >> 6);
	      if (metrics->ascent < (m->horiBearingY >> 6))
		metrics->ascent = m->horiBearingY >> 6;
	      if (metrics->descent > ((m->horiBearingY + m->height) >> 6))
		metrics->descent = (m->horiBearingY + m->height) >> 6;
	    }
	  width += m->horiAdvance >> 6;
	}
      else
	{
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	  width += font->space_width;
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