src/xsettings.c

   1 /* Functions for handle font changes dynamically.
   2    Copyright (C) 2009, 2010, 2011
   3                  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include <setjmp.h>
  22 #include <fcntl.h>
  23 #include "lisp.h"
  24 #include "xterm.h"
  25 #include "xsettings.h"
  26 #include "frame.h"
  27 #include "keyboard.h"
  28 #include "blockinput.h"
  29 #include "termhooks.h"
  30 #include "termopts.h"
  31
  32 #include <X11/Xproto.h>
  33
  34 #ifdef HAVE_GCONF
  35 #include <gconf/gconf-client.h>
  36 #endif
  37 #ifdef HAVE_XFT
  38 #include <X11/Xft/Xft.h>
  39 #endif
  40
  41 static char *current_mono_font;
  42 static struct x_display_info *first_dpyinfo;
  43 static Lisp_Object Qfont_name, Qfont_render;
  44 static int use_system_font;
  45 static Lisp_Object Vxft_settings;
  46
  47
  48 #ifdef HAVE_GCONF
  49 static GConfClient *gconf_client;
  50 #endif
  51
  52
  53 static void
  54 store_font_changed_event (arg, display_name)
  55      Lisp_Object arg;
  56      Lisp_Object display_name;
  57 {
  58   struct input_event event;
  59   EVENT_INIT (event);
  60   event.kind = CONFIG_CHANGED_EVENT;
  61   event.frame_or_window = display_name;
  62   event.arg = arg;
  63   kbd_buffer_store_event (&event);
  64 }
  65
  66 #ifdef HAVE_GCONF
  67
  68 #define SYSTEM_MONO_FONT       "/desktop/gnome/interface/monospace_font_name"
  69
  70 /* Callback called when something changed in GConf that we care about,
  71    that is SYSTEM_MONO_FONT.  */
  72
  73 static void
  74 something_changedCB (client, cnxn_id, entry, user_data)
  75      GConfClient *client;
  76      guint cnxn_id;
  77      GConfEntry *entry;
  78      gpointer user_data;
  79 {
  80   GConfValue *v = gconf_entry_get_value (entry);
  81
  82   if (!v) return;
  83   if (v->type == GCONF_VALUE_STRING)
  84     {
  85       const char *value = gconf_value_get_string (v);
  86       int i;
  87       if (current_mono_font != NULL && strcmp (value, current_mono_font) == 0)
  88         return; /* No change. */
  89
  90       xfree (current_mono_font);
  91       current_mono_font = xstrdup (value);
  92     }
  93
  94
  95   if (first_dpyinfo != NULL)
  96     {
  97       /* Check if display still open */
  98       struct x_display_info *dpyinfo;
  99       int found = 0;
 100       for (dpyinfo = x_display_list; !found && dpyinfo; dpyinfo = dpyinfo->next)
 101         found = dpyinfo == first_dpyinfo;
 102
 103       if (found && use_system_font)
 104         store_font_changed_event (Qfont_name,
 105                                   XCAR (first_dpyinfo->name_list_element));
 106     }
 107 }
 108 #endif /* HAVE_GCONF */
 109
 110 #ifdef HAVE_XFT
 111
 112 /* Older fontconfig versions don't have FC_LCD_*.  */
 113 #ifndef FC_LCD_NONE
 114 #define FC_LCD_NONE 0
 115 #endif
 116 #ifndef FC_LCD_DEFAULT
 117 #define FC_LCD_DEFAULT 1
 118 #endif
 119 #ifndef FC_LCD_FILTER
 120 #define FC_LCD_FILTER "lcdfilter"
 121 #endif
 122
 123 /* Find the window that contains the XSETTINGS property values.  */
 124
 125 static void
 126 get_prop_window (dpyinfo)
 127      struct x_display_info *dpyinfo;
 128 {
 129   Display *dpy = dpyinfo->display;
 130
 131   XGrabServer (dpy);
 132   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 133                                                   dpyinfo->Xatom_xsettings_sel);
 134   if (dpyinfo->xsettings_window != None)
 135     /* Select events so we can detect if window is deleted or if settings
 136        are changed.  */
 137     XSelectInput (dpy, dpyinfo->xsettings_window,
 138                   PropertyChangeMask|StructureNotifyMask);
 139
 140   XUngrabServer (dpy);
 141 }
 142
 143 enum {
 144   SEEN_AA         = 0x01,
 145   SEEN_HINTING    = 0x02,
 146   SEEN_RGBA       = 0x04,
 147   SEEN_LCDFILTER  = 0x08,
 148   SEEN_HINTSTYLE  = 0x10,
 149   SEEN_DPI        = 0x20,
 150 };
 151 struct xsettings
 152 {
 153   FcBool aa, hinting;
 154   int rgba, lcdfilter, hintstyle;
 155   double dpi;
 156
 157   unsigned seen;
 158 };
 159
 160 #define SWAP32(nr) (((nr) << 24) | (((nr) << 8) & 0xff0000)     \
 161                     | (((nr) >> 8) & 0xff00) | ((nr) >> 24))
 162 #define SWAP16(nr) (((nr) << 8) | ((nr) >> 8))
 163 #define PAD(nr)    (((nr) + 3) & ~3)
 164
 165 /* Parse xsettings and extract those that deal with Xft.
 166    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 167    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 168
 169    Layout of prop.  First is a header:
 170
 171    bytes   type     what
 172    ------------------------------------
 173    1      CARD8    byte-order
 174    3               unused
 175    4      CARD32   SERIAL
 176    4      CARD32   N_SETTINGS
 177
 178    Then N_SETTINGS records, with header:
 179
 180    bytes   type          what
 181    ------------------------------------
 182    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 183    1                    unused
 184    2      CARD16        n == name-length
 185    n      STRING8       name
 186    p                    unused, p=pad_to_even_4(n)
 187    4      CARD32        last-change-serial
 188
 189    and then the value, For string:
 190
 191    bytes   type          what
 192    ------------------------------------
 193    4      CARD32        n = value-length
 194    n      STRING8       value
 195    p                    unused, p=pad_to_even_4(n)
 196
 197    For integer:
 198
 199    bytes   type          what
 200    ------------------------------------
 201    4      INT32         value
 202
 203    For RGB color:
 204
 205    bytes   type          what
 206    ------------------------------------
 207    2      CARD16        red
 208    2      CARD16        blue
 209    2      CARD16        green
 210    2      CARD16        alpha
 211
 212    Returns non-zero if some Xft settings was seen, zero otherwise.
 213 */
 214
 215 static int
 216 parse_xft_settings (prop, bytes, settings)
 217      unsigned char *prop;
 218      unsigned long bytes;
 219      struct xsettings *settings;
 220 {
 221   Lisp_Object byteorder = Fbyteorder ();
 222   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 223   int that_bo = prop[0];
 224   CARD32 n_settings;
 225   int bytes_parsed = 0;
 226   int settings_seen = 0;
 227   int i = 0;
 228
 229   /* First 4 bytes is a serial number, skip that.  */
 230
 231   if (bytes < 12) return BadLength;
 232   memcpy (&n_settings, prop+8, 4);
 233   if (my_bo != that_bo) n_settings = SWAP32 (n_settings);
 234   bytes_parsed = 12;
 235
 236   memset (settings, 0, sizeof (*settings));
 237
 238   while (bytes_parsed+4 < bytes && settings_seen < 6
 239          && i < n_settings)
 240     {
 241       int type = prop[bytes_parsed++];
 242       CARD16 nlen;
 243       CARD32 vlen, ival = 0;
 244       char name[128]; /* The names we are looking for are not this long.  */
 245       char sval[128]; /* The values we are looking for are not this long.  */
 246       int is_xft;
 247       int to_cpy;
 248
 249       sval[0] = '\0';
 250       ++i;
 251       ++bytes_parsed; /* Padding */
 252
 253       memcpy (&nlen, prop+bytes_parsed, 2);
 254       bytes_parsed += 2;
 255       if (my_bo != that_bo) nlen = SWAP16 (nlen);
 256       if (bytes_parsed+nlen > bytes) return BadLength;
 257       to_cpy = nlen > 127 ? 127 : nlen;
 258       memcpy (name, prop+bytes_parsed, to_cpy);
 259       name[to_cpy] = '\0';
 260
 261       bytes_parsed += nlen;
 262       bytes_parsed = PAD (bytes_parsed);
 263
 264       bytes_parsed += 4; /* Skip serial for this value */
 265       if (bytes_parsed > bytes) return BadLength;
 266
 267       is_xft = nlen > 6 && strncmp (name, "Xft/", 4) == 0;
 268
 269       switch (type)
 270         {
 271         case 0: /* Integer */
 272           if (bytes_parsed+4 > bytes) return BadLength;
 273           if (is_xft)
 274             {
 275               memcpy (&ival, prop+bytes_parsed, 4);
 276               if (my_bo != that_bo) ival = SWAP32 (ival);
 277             }
 278           bytes_parsed += 4;
 279           break;
 280
 281         case 1: /* String */
 282           if (bytes_parsed+4 > bytes) return BadLength;
 283           memcpy (&vlen, prop+bytes_parsed, 4);
 284           bytes_parsed += 4;
 285           if (my_bo != that_bo) vlen = SWAP32 (vlen);
 286           if (is_xft)
 287             {
 288               to_cpy = vlen > 127 ? 127 : vlen;
 289               memcpy (sval, prop+bytes_parsed, to_cpy);
 290               sval[to_cpy] = '\0';
 291             }
 292           bytes_parsed += vlen;
 293           bytes_parsed = PAD (bytes_parsed);
 294           break;
 295
 296         case 2: /* RGB value */
 297           /* No need to parse this */
 298           if (bytes_parsed+8 > bytes) return BadLength;
 299           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 300           break;
 301
 302         default: /* Parse Error */
 303           return BadValue;
 304         }
 305
 306       if (is_xft)
 307         {
 308           ++settings_seen;
 309           if (strcmp (name, "Xft/Antialias") == 0)
 310             {
 311               settings->seen |= SEEN_AA;
 312               settings->aa = ival != 0;
 313             }
 314           else if (strcmp (name, "Xft/Hinting") == 0)
 315             {
 316               settings->seen |= SEEN_HINTING;
 317               settings->hinting = ival != 0;
 318             }
 319           else if (strcmp (name, "Xft/HintStyle") == 0)
 320             {
 321               settings->seen |= SEEN_HINTSTYLE;
 322               if (strcmp (sval, "hintnone") == 0)
 323                 settings->hintstyle = FC_HINT_NONE;
 324               else if (strcmp (sval, "hintslight") == 0)
 325                 settings->hintstyle = FC_HINT_SLIGHT;
 326               else if (strcmp (sval, "hintmedium") == 0)
 327                 settings->hintstyle = FC_HINT_MEDIUM;
 328               else if (strcmp (sval, "hintfull") == 0)
 329                 settings->hintstyle = FC_HINT_FULL;
 330               else
 331                 settings->seen &= ~SEEN_HINTSTYLE;
 332             }
 333           else if (strcmp (name, "Xft/RGBA") == 0)
 334             {
 335               settings->seen |= SEEN_RGBA;
 336               if (strcmp (sval, "none") == 0)
 337                 settings->rgba = FC_RGBA_NONE;
 338               else if (strcmp (sval, "rgb") == 0)
 339                 settings->rgba = FC_RGBA_RGB;
 340               else if (strcmp (sval, "bgr") == 0)
 341                 settings->rgba = FC_RGBA_BGR;
 342               else if (strcmp (sval, "vrgb") == 0)
 343                 settings->rgba = FC_RGBA_VRGB;
 344               else if (strcmp (sval, "vbgr") == 0)
 345                 settings->rgba = FC_RGBA_VBGR;
 346               else
 347                 settings->seen &= ~SEEN_RGBA;
 348             }
 349           else if (strcmp (name, "Xft/DPI") == 0)
 350             {
 351               settings->seen |= SEEN_DPI;
 352               settings->dpi = (double)ival/1024.0;
 353             }
 354           else if (strcmp (name, "Xft/lcdfilter") == 0)
 355             {
 356               settings->seen |= SEEN_LCDFILTER;
 357               if (strcmp (sval, "none") == 0)
 358                 settings->lcdfilter = FC_LCD_NONE;
 359               else if (strcmp (sval, "lcddefault") == 0)
 360                 settings->lcdfilter = FC_LCD_DEFAULT;
 361               else
 362                 settings->seen &= ~SEEN_LCDFILTER;
 363             }
 364         }
 365     }
 366
 367   return settings_seen;
 368 }
 369
 370 static int
 371 read_xft_settings (dpyinfo, settings)
 372      struct x_display_info *dpyinfo;
 373      struct xsettings *settings;
 374 {
 375   long long_len;
 376   Atom act_type;
 377   int act_form;
 378   unsigned long nitems, bytes_after;
 379   unsigned char *prop = NULL;
 380   Display *dpy = dpyinfo->display;
 381   int rc;
 382
 383   x_catch_errors (dpy);
 384   rc = XGetWindowProperty (dpy,
 385                            dpyinfo->xsettings_window,
 386                            dpyinfo->Xatom_xsettings_prop,
 387                            0, LONG_MAX, False, AnyPropertyType,
 388                            &act_type, &act_form, &nitems, &bytes_after,
 389                            &prop);
 390
 391   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 392       && act_type == dpyinfo->Xatom_xsettings_prop)
 393     rc = parse_xft_settings (prop, nitems, settings);
 394
 395   XFree (prop);
 396
 397   x_uncatch_errors ();
 398
 399   return rc != 0;
 400 }
 401
 402
 403 static void
 404 apply_xft_settings (dpyinfo, send_event_p)
 405      struct x_display_info *dpyinfo;
 406      int send_event_p;
 407 {
 408   FcPattern *pat;
 409   struct xsettings settings, oldsettings;
 410   int changed = 0;
 411   char buf[256];
 412
 413   if (!read_xft_settings (dpyinfo, &settings))
 414     return;
 415
 416   memset (&oldsettings, 0, sizeof (oldsettings));
 417   buf[0] = '\0';
 418   pat = FcPatternCreate ();
 419   XftDefaultSubstitute (dpyinfo->display,
 420                         XScreenNumberOfScreen (dpyinfo->screen),
 421                         pat);
 422   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 423   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 424   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 425   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 426   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 427   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 428
 429   if ((settings.seen & SEEN_AA) != 0 && oldsettings.aa != settings.aa)
 430     {
 431       FcPatternDel (pat, FC_ANTIALIAS);
 432       FcPatternAddBool (pat, FC_ANTIALIAS, settings.aa);
 433       ++changed;
 434       oldsettings.aa = settings.aa;
 435     }
 436   sprintf (buf, "Antialias: %d", oldsettings.aa);
 437
 438   if ((settings.seen & SEEN_HINTING) != 0
 439       && oldsettings.hinting != settings.hinting)
 440     {
 441       FcPatternDel (pat, FC_HINTING);
 442       FcPatternAddBool (pat, FC_HINTING, settings.hinting);
 443       ++changed;
 444       oldsettings.hinting = settings.hinting;
 445     }
 446   if (strlen (buf) > 0) strcat (buf, ", ");
 447   sprintf (buf+strlen (buf), "Hinting: %d", oldsettings.hinting);
 448   if ((settings.seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings.rgba)
 449     {
 450       FcPatternDel (pat, FC_RGBA);
 451       FcPatternAddInteger (pat, FC_RGBA, settings.rgba);
 452       oldsettings.rgba = settings.rgba;
 453       ++changed;
 454     }
 455   if (strlen (buf) > 0) strcat (buf, ", ");
 456   sprintf (buf+strlen (buf), "RGBA: %d", oldsettings.rgba);
 457
 458   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 459   if ((settings.seen & SEEN_LCDFILTER) != 0
 460       && oldsettings.lcdfilter != settings.lcdfilter)
 461     {
 462       FcPatternDel (pat, FC_LCD_FILTER);
 463       FcPatternAddInteger (pat, FC_LCD_FILTER, settings.lcdfilter);
 464       ++changed;
 465       oldsettings.lcdfilter = settings.lcdfilter;
 466     }
 467   if (strlen (buf) > 0) strcat (buf, ", ");
 468   sprintf (buf+strlen (buf), "LCDFilter: %d", oldsettings.lcdfilter);
 469
 470   if ((settings.seen & SEEN_HINTSTYLE) != 0
 471       && oldsettings.hintstyle != settings.hintstyle)
 472     {
 473       FcPatternDel (pat, FC_HINT_STYLE);
 474       FcPatternAddInteger (pat, FC_HINT_STYLE, settings.hintstyle);
 475       ++changed;
 476       oldsettings.hintstyle = settings.hintstyle;
 477     }
 478   if (strlen (buf) > 0) strcat (buf, ", ");
 479   sprintf (buf+strlen (buf), "Hintstyle: %d", oldsettings.hintstyle);
 480
 481   if ((settings.seen & SEEN_DPI) != 0 && oldsettings.dpi != settings.dpi
 482       && settings.dpi > 0)
 483     {
 484       Lisp_Object frame, tail;
 485
 486       FcPatternDel (pat, FC_DPI);
 487       FcPatternAddDouble (pat, FC_DPI, settings.dpi);
 488       ++changed;
 489       oldsettings.dpi = settings.dpi;
 490
 491       /* Change the DPI on this display and all frames on the display.  */
 492       dpyinfo->resy = dpyinfo->resx = settings.dpi;
 493       FOR_EACH_FRAME (tail, frame)
 494         if (FRAME_X_P (XFRAME (frame))
 495             && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
 496           XFRAME (frame)->resy = XFRAME (frame)->resx = settings.dpi;
 497     }
 498
 499   if (strlen (buf) > 0) strcat (buf, ", ");
 500   sprintf (buf+strlen (buf), "DPI: %lf", oldsettings.dpi);
 501
 502   if (changed)
 503     {
 504       XftDefaultSet (dpyinfo->display, pat);
 505       if (send_event_p)
 506         store_font_changed_event (Qfont_render,
 507                                   XCAR (dpyinfo->name_list_element));
 508       Vxft_settings = make_string (buf, strlen (buf));
 509     }
 510   else
 511     FcPatternDestroy (pat);
 512 }
 513
 514 #endif /* HAVE_XFT */
 515
 516 void
 517 xft_settings_event (dpyinfo, event)
 518      struct x_display_info *dpyinfo;
 519      XEvent *event;
 520 {
 521 #ifdef HAVE_XFT
 522   int check_window_p = 0;
 523
 524   switch (event->type)
 525     {
 526     case DestroyNotify:
 527       if (dpyinfo->xsettings_window == event->xany.window)
 528         check_window_p = 1;
 529       break;
 530
 531     case ClientMessage:
 532       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 533           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 534           && event->xclient.window == dpyinfo->root_window)
 535         check_window_p = 1;
 536       break;
 537
 538     case PropertyNotify:
 539       if (event->xproperty.window == dpyinfo->xsettings_window
 540           && event->xproperty.state == PropertyNewValue
 541           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 542         {
 543           apply_xft_settings (dpyinfo, True);
 544         }
 545       break;
 546     }
 547
 548   if (check_window_p)
 549     {
 550       dpyinfo->xsettings_window = None;
 551       get_prop_window (dpyinfo);
 552       if (dpyinfo->xsettings_window != None)
 553         apply_xft_settings (dpyinfo, True);
 554     }
 555 #endif /* HAVE_XFT */
 556 }
 557
 558
 559 static void
 560 init_gconf ()
 561 {
 562 #if defined (HAVE_GCONF) && defined (HAVE_XFT)
 563   int i;
 564   char *s;
 565
 566 #ifdef HAVE_G_TYPE_INIT
 567   g_type_init ();
 568 #endif
 569   gconf_client = gconf_client_get_default ();
 570   s = gconf_client_get_string (gconf_client, SYSTEM_MONO_FONT, NULL);
 571   if (s)
 572     {
 573       current_mono_font = xstrdup (s);
 574       g_free (s);
 575     }
 576   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 577   gconf_client_add_dir (gconf_client,
 578                         SYSTEM_MONO_FONT,
 579                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 580                         NULL);
 581   gconf_client_notify_add (gconf_client,
 582                            SYSTEM_MONO_FONT,
 583                            something_changedCB,
 584                            NULL, NULL, NULL);
 585 #endif /* HAVE_GCONF && HAVE_XFT */
 586 }
 587
 588 static void
 589 init_xfd_settings (dpyinfo)
 590      struct x_display_info *dpyinfo;
 591 {
 592 #ifdef HAVE_XFT
 593   char sel[64];
 594   Display *dpy = dpyinfo->display;
 595
 596   BLOCK_INPUT;
 597
 598   sprintf (sel, "_XSETTINGS_S%d", XScreenNumberOfScreen (dpyinfo->screen));
 599   dpyinfo->Xatom_xsettings_sel = XInternAtom (dpy, sel, False);
 600   dpyinfo->Xatom_xsettings_prop = XInternAtom (dpy,
 601                                                "_XSETTINGS_SETTINGS",
 602                                                False);
 603   dpyinfo->Xatom_xsettings_mgr = XInternAtom (dpy, "MANAGER", False);
 604
 605   /* Select events so we can detect client messages sent when selection
 606      owner changes.  */
 607   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 608
 609   get_prop_window (dpyinfo);
 610   if (dpyinfo->xsettings_window != None)
 611     apply_xft_settings (dpyinfo, False);
 612
 613   UNBLOCK_INPUT;
 614
 615 #else /* ! HAVE_XFT */
 616
 617   dpyinfo->Xatom_xsettings_sel = None;
 618   dpyinfo->Xatom_xsettings_prop = None;
 619   dpyinfo->Xatom_xsettings_mgr = None;
 620   dpyinfo->xsettings_window = None;
 621
 622 #endif /* ! HAVE_XFT */
 623 }
 624
 625 void
 626 xsettings_initialize (dpyinfo)
 627      struct x_display_info *dpyinfo;
 628 {
 629   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 630   init_gconf ();
 631   init_xfd_settings (dpyinfo);
 632 }
 633
 634 const char *
 635 xsettings_get_system_font ()
 636 {
 637   return current_mono_font;
 638 }
 639
 640 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 641        0, 0, 0,
 642        doc: /* Get the system default monospaced font. */)
 643   ()
 644 {
 645   return current_mono_font && use_system_font
 646     ? make_string (current_mono_font, strlen (current_mono_font))
 647     : Qnil;
 648 }
 649
 650 void
 651 syms_of_xsettings ()
 652 {
 653   current_mono_font = NULL;
 654   first_dpyinfo = NULL;
 655 #ifdef HAVE_GCONF
 656   gconf_client = NULL;
 657 #endif
 658
 659   Qfont_name = intern_c_string ("font-name");
 660   staticpro (&Qfont_name);
 661   Qfont_render = intern_c_string ("font-render");
 662   staticpro (&Qfont_render);
 663   defsubr (&Sfont_get_system_font);
 664
 665   DEFVAR_BOOL ("font-use-system-font", &use_system_font,
 666     doc: /* *Non-nil means to use the system defined font.  */);
 667   use_system_font = 0;
 668
 669   DEFVAR_LISP ("xft-settings", &Vxft_settings,
 670                doc: /* Font settings applied to Xft.  */);
 671   Vxft_settings = make_string ("", 0);
 672
 673 #ifdef HAVE_XFT
 674   Fprovide (intern_c_string ("font-render-setting"), Qnil);
 675 #ifdef HAVE_GCONF
 676   Fprovide (intern_c_string ("system-font-setting"), Qnil);
 677 #endif
 678 #endif
 679 }
 680
 681 /* arch-tag: 541716ed-2e6b-42e1-8212-3197e01ea61d
 682    (do not change this comment) */