src/xsettings.c

   1 /* Functions for handle font changes dynamically.
   2    Copyright (C) 2009, 2010
   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 char *current_font;
  43 static struct x_display_info *first_dpyinfo;
  44 static Lisp_Object Qmonospace_font_name, Qfont_name, Qfont_render,
  45   Qtool_bar_style;
  46 static int use_system_font;
  47 static Lisp_Object Vxft_settings;
  48 static Lisp_Object current_tool_bar_style;
  49
  50 #ifdef HAVE_GCONF
  51 static GConfClient *gconf_client;
  52 #endif
  53
  54
  55 static void
  56 store_config_changed_event (arg, display_name)
  57      Lisp_Object arg;
  58      Lisp_Object display_name;
  59 {
  60   struct input_event event;
  61   EVENT_INIT (event);
  62   event.kind = CONFIG_CHANGED_EVENT;
  63   event.frame_or_window = display_name;
  64   event.arg = arg;
  65   kbd_buffer_store_event (&event);
  66 }
  67
  68 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
  69 #define XSETTINGS_TOOL_BAR_STYLE  "Gtk/ToolbarStyle"
  70
  71 enum {
  72   SEEN_AA         = 0x01,
  73   SEEN_HINTING    = 0x02,
  74   SEEN_RGBA       = 0x04,
  75   SEEN_LCDFILTER  = 0x08,
  76   SEEN_HINTSTYLE  = 0x10,
  77   SEEN_DPI        = 0x20,
  78   SEEN_FONT       = 0x40,
  79   SEEN_TB_STYLE   = 0x80,
  80 };
  81 struct xsettings
  82 {
  83 #ifdef HAVE_XFT
  84   FcBool aa, hinting;
  85   int rgba, lcdfilter, hintstyle;
  86   double dpi;
  87 #endif
  88
  89   char *font;
  90   char *tb_style;
  91
  92   unsigned seen;
  93 };
  94
  95 #ifdef HAVE_GCONF
  96
  97 #define SYSTEM_MONO_FONT     "/desktop/gnome/interface/monospace_font_name"
  98 #define SYSTEM_FONT          "/desktop/gnome/interface/font_name"
  99
 100 /* Callback called when something changed in GConf that we care about,
 101    that is SYSTEM_MONO_FONT.  */
 102
 103 static void
 104 something_changedCB (client, cnxn_id, entry, user_data)
 105      GConfClient *client;
 106      guint cnxn_id;
 107      GConfEntry *entry;
 108      gpointer user_data;
 109 {
 110   GConfValue *v = gconf_entry_get_value (entry);
 111
 112   if (!v) return;
 113   if (v->type == GCONF_VALUE_STRING)
 114     {
 115       const char *value = gconf_value_get_string (v);
 116       int i;
 117       if (current_mono_font != NULL && strcmp (value, current_mono_font) == 0)
 118         return; /* No change. */
 119
 120       xfree (current_mono_font);
 121       current_mono_font = xstrdup (value);
 122     }
 123
 124
 125   if (first_dpyinfo != NULL)
 126     {
 127       /* Check if display still open */
 128       struct x_display_info *dpyinfo;
 129       int found = 0;
 130       for (dpyinfo = x_display_list; !found && dpyinfo; dpyinfo = dpyinfo->next)
 131         found = dpyinfo == first_dpyinfo;
 132
 133       if (found && use_system_font)
 134         store_config_changed_event (Qmonospace_font_name,
 135                                     XCAR (first_dpyinfo->name_list_element));
 136     }
 137 }
 138 #endif /* HAVE_GCONF */
 139
 140 #ifdef HAVE_XFT
 141
 142 /* Older fontconfig versions don't have FC_LCD_*.  */
 143 #ifndef FC_LCD_NONE
 144 #define FC_LCD_NONE 0
 145 #endif
 146 #ifndef FC_LCD_DEFAULT
 147 #define FC_LCD_DEFAULT 1
 148 #endif
 149 #ifndef FC_LCD_FILTER
 150 #define FC_LCD_FILTER "lcdfilter"
 151 #endif
 152
 153 #endif /* HAVE_XFT */
 154
 155 /* Find the window that contains the XSETTINGS property values.  */
 156
 157 static void
 158 get_prop_window (dpyinfo)
 159      struct x_display_info *dpyinfo;
 160 {
 161   Display *dpy = dpyinfo->display;
 162
 163   XGrabServer (dpy);
 164   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 165                                                   dpyinfo->Xatom_xsettings_sel);
 166   if (dpyinfo->xsettings_window != None)
 167     /* Select events so we can detect if window is deleted or if settings
 168        are changed.  */
 169     XSelectInput (dpy, dpyinfo->xsettings_window,
 170                   PropertyChangeMask|StructureNotifyMask);
 171
 172   XUngrabServer (dpy);
 173 }
 174
 175 #define SWAP32(nr) (((nr) << 24) | (((nr) << 8) & 0xff0000)     \
 176                     | (((nr) >> 8) & 0xff00) | ((nr) >> 24))
 177 #define SWAP16(nr) (((nr) << 8) | ((nr) >> 8))
 178 #define PAD(nr)    (((nr) + 3) & ~3)
 179
 180 /* Parse xsettings and extract those that deal with Xft.
 181    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 182    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 183
 184    Layout of prop.  First is a header:
 185
 186    bytes   type     what
 187    ------------------------------------
 188    1      CARD8    byte-order
 189    3               unused
 190    4      CARD32   SERIAL
 191    4      CARD32   N_SETTINGS
 192
 193    Then N_SETTINGS records, with header:
 194
 195    bytes   type          what
 196    ------------------------------------
 197    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 198    1                    unused
 199    2      CARD16        n == name-length
 200    n      STRING8       name
 201    p                    unused, p=pad_to_even_4(n)
 202    4      CARD32        last-change-serial
 203
 204    and then the value, For string:
 205
 206    bytes   type          what
 207    ------------------------------------
 208    4      CARD32        n = value-length
 209    n      STRING8       value
 210    p                    unused, p=pad_to_even_4(n)
 211
 212    For integer:
 213
 214    bytes   type          what
 215    ------------------------------------
 216    4      INT32         value
 217
 218    For RGB color:
 219
 220    bytes   type          what
 221    ------------------------------------
 222    2      CARD16        red
 223    2      CARD16        blue
 224    2      CARD16        green
 225    2      CARD16        alpha
 226
 227    Returns non-zero if some Xft settings was seen, zero otherwise.
 228 */
 229
 230 static int
 231 parse_settings (prop, bytes, settings)
 232      unsigned char *prop;
 233      unsigned long bytes;
 234      struct xsettings *settings;
 235 {
 236   Lisp_Object byteorder = Fbyteorder ();
 237   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 238   int that_bo = prop[0];
 239   CARD32 n_settings;
 240   int bytes_parsed = 0;
 241   int settings_seen = 0;
 242   int i = 0;
 243
 244   /* First 4 bytes is a serial number, skip that.  */
 245
 246   if (bytes < 12) return BadLength;
 247   memcpy (&n_settings, prop+8, 4);
 248   if (my_bo != that_bo) n_settings = SWAP32 (n_settings);
 249   bytes_parsed = 12;
 250
 251   memset (settings, 0, sizeof (*settings));
 252
 253   while (bytes_parsed+4 < bytes && settings_seen < 7
 254          && i < n_settings)
 255     {
 256       int type = prop[bytes_parsed++];
 257       CARD16 nlen;
 258       CARD32 vlen, ival = 0;
 259       char name[128]; /* The names we are looking for are not this long.  */
 260       char sval[128]; /* The values we are looking for are not this long.  */
 261       int want_this;
 262       int to_cpy;
 263
 264       sval[0] = '\0';
 265       ++i;
 266       ++bytes_parsed; /* Padding */
 267
 268       memcpy (&nlen, prop+bytes_parsed, 2);
 269       bytes_parsed += 2;
 270       if (my_bo != that_bo) nlen = SWAP16 (nlen);
 271       if (bytes_parsed+nlen > bytes) return BadLength;
 272       to_cpy = nlen > 127 ? 127 : nlen;
 273       memcpy (name, prop+bytes_parsed, to_cpy);
 274       name[to_cpy] = '\0';
 275
 276       bytes_parsed += nlen;
 277       bytes_parsed = PAD (bytes_parsed);
 278
 279       bytes_parsed += 4; /* Skip serial for this value */
 280       if (bytes_parsed > bytes) return BadLength;
 281
 282       want_this =
 283 #ifdef HAVE_XFT
 284         (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
 285         ||
 286 #endif
 287         (strcmp (XSETTINGS_FONT_NAME, name) == 0)
 288         || (strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0);
 289
 290       switch (type)
 291         {
 292         case 0: /* Integer */
 293           if (bytes_parsed+4 > bytes) return BadLength;
 294           if (want_this)
 295             {
 296               memcpy (&ival, prop+bytes_parsed, 4);
 297               if (my_bo != that_bo) ival = SWAP32 (ival);
 298             }
 299           bytes_parsed += 4;
 300           break;
 301
 302         case 1: /* String */
 303           if (bytes_parsed+4 > bytes) return BadLength;
 304           memcpy (&vlen, prop+bytes_parsed, 4);
 305           bytes_parsed += 4;
 306           if (my_bo != that_bo) vlen = SWAP32 (vlen);
 307           if (want_this)
 308             {
 309               to_cpy = vlen > 127 ? 127 : vlen;
 310               memcpy (sval, prop+bytes_parsed, to_cpy);
 311               sval[to_cpy] = '\0';
 312             }
 313           bytes_parsed += vlen;
 314           bytes_parsed = PAD (bytes_parsed);
 315           break;
 316
 317         case 2: /* RGB value */
 318           /* No need to parse this */
 319           if (bytes_parsed+8 > bytes) return BadLength;
 320           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 321           break;
 322
 323         default: /* Parse Error */
 324           return BadValue;
 325         }
 326
 327       if (want_this)
 328         {
 329           ++settings_seen;
 330           if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 331             {
 332               settings->font = xstrdup (sval);
 333               settings->seen |= SEEN_FONT;
 334             }
 335           else if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 336             {
 337               settings->tb_style = xstrdup (sval);
 338               settings->seen |= SEEN_TB_STYLE;
 339             }
 340 #ifdef HAVE_XFT
 341           else if (strcmp (name, "Xft/Antialias") == 0)
 342             {
 343               settings->seen |= SEEN_AA;
 344               settings->aa = ival != 0;
 345             }
 346           else if (strcmp (name, "Xft/Hinting") == 0)
 347             {
 348               settings->seen |= SEEN_HINTING;
 349               settings->hinting = ival != 0;
 350             }
 351           else if (strcmp (name, "Xft/HintStyle") == 0)
 352             {
 353               settings->seen |= SEEN_HINTSTYLE;
 354               if (strcmp (sval, "hintnone") == 0)
 355                 settings->hintstyle = FC_HINT_NONE;
 356               else if (strcmp (sval, "hintslight") == 0)
 357                 settings->hintstyle = FC_HINT_SLIGHT;
 358               else if (strcmp (sval, "hintmedium") == 0)
 359                 settings->hintstyle = FC_HINT_MEDIUM;
 360               else if (strcmp (sval, "hintfull") == 0)
 361                 settings->hintstyle = FC_HINT_FULL;
 362               else
 363                 settings->seen &= ~SEEN_HINTSTYLE;
 364             }
 365           else if (strcmp (name, "Xft/RGBA") == 0)
 366             {
 367               settings->seen |= SEEN_RGBA;
 368               if (strcmp (sval, "none") == 0)
 369                 settings->rgba = FC_RGBA_NONE;
 370               else if (strcmp (sval, "rgb") == 0)
 371                 settings->rgba = FC_RGBA_RGB;
 372               else if (strcmp (sval, "bgr") == 0)
 373                 settings->rgba = FC_RGBA_BGR;
 374               else if (strcmp (sval, "vrgb") == 0)
 375                 settings->rgba = FC_RGBA_VRGB;
 376               else if (strcmp (sval, "vbgr") == 0)
 377                 settings->rgba = FC_RGBA_VBGR;
 378               else
 379                 settings->seen &= ~SEEN_RGBA;
 380             }
 381           else if (strcmp (name, "Xft/DPI") == 0)
 382             {
 383               settings->seen |= SEEN_DPI;
 384               settings->dpi = (double)ival/1024.0;
 385             }
 386           else if (strcmp (name, "Xft/lcdfilter") == 0)
 387             {
 388               settings->seen |= SEEN_LCDFILTER;
 389               if (strcmp (sval, "none") == 0)
 390                 settings->lcdfilter = FC_LCD_NONE;
 391               else if (strcmp (sval, "lcddefault") == 0)
 392                 settings->lcdfilter = FC_LCD_DEFAULT;
 393               else
 394                 settings->seen &= ~SEEN_LCDFILTER;
 395             }
 396 #endif /* HAVE_XFT */
 397         }
 398     }
 399
 400   return settings_seen;
 401 }
 402
 403 static int
 404 read_settings (dpyinfo, settings)
 405      struct x_display_info *dpyinfo;
 406      struct xsettings *settings;
 407 {
 408   long long_len;
 409   Atom act_type;
 410   int act_form;
 411   unsigned long nitems, bytes_after;
 412   unsigned char *prop = NULL;
 413   Display *dpy = dpyinfo->display;
 414   int rc;
 415
 416   x_catch_errors (dpy);
 417   rc = XGetWindowProperty (dpy,
 418                            dpyinfo->xsettings_window,
 419                            dpyinfo->Xatom_xsettings_prop,
 420                            0, LONG_MAX, False, AnyPropertyType,
 421                            &act_type, &act_form, &nitems, &bytes_after,
 422                            &prop);
 423
 424   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 425       && act_type == dpyinfo->Xatom_xsettings_prop)
 426     rc = parse_settings (prop, nitems, settings);
 427
 428   XFree (prop);
 429
 430   x_uncatch_errors ();
 431
 432   return rc != 0;
 433 }
 434
 435
 436 static void
 437 apply_xft_settings (dpyinfo, send_event_p, settings)
 438      struct x_display_info *dpyinfo;
 439      int send_event_p;
 440      struct xsettings *settings;
 441 {
 442 #ifdef HAVE_XFT
 443   FcPattern *pat;
 444   struct xsettings oldsettings;
 445   int changed = 0;
 446   char buf[256];
 447
 448   memset (&oldsettings, 0, sizeof (oldsettings));
 449   buf[0] = '\0';
 450   pat = FcPatternCreate ();
 451   XftDefaultSubstitute (dpyinfo->display,
 452                         XScreenNumberOfScreen (dpyinfo->screen),
 453                         pat);
 454   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 455   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 456   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 457   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 458   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 459   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 460
 461   if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
 462     {
 463       FcPatternDel (pat, FC_ANTIALIAS);
 464       FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
 465       ++changed;
 466       oldsettings.aa = settings->aa;
 467     }
 468   sprintf (buf, "Antialias: %d", oldsettings.aa);
 469
 470   if ((settings->seen & SEEN_HINTING) != 0
 471       && oldsettings.hinting != settings->hinting)
 472     {
 473       FcPatternDel (pat, FC_HINTING);
 474       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 475       ++changed;
 476       oldsettings.hinting = settings->hinting;
 477     }
 478   if (strlen (buf) > 0) strcat (buf, ", ");
 479   sprintf (buf+strlen (buf), "Hinting: %d", oldsettings.hinting);
 480   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 481     {
 482       FcPatternDel (pat, FC_RGBA);
 483       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 484       oldsettings.rgba = settings->rgba;
 485       ++changed;
 486     }
 487   if (strlen (buf) > 0) strcat (buf, ", ");
 488   sprintf (buf+strlen (buf), "RGBA: %d", oldsettings.rgba);
 489
 490   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 491   if ((settings->seen & SEEN_LCDFILTER) != 0
 492       && oldsettings.lcdfilter != settings->lcdfilter)
 493     {
 494       FcPatternDel (pat, FC_LCD_FILTER);
 495       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 496       ++changed;
 497       oldsettings.lcdfilter = settings->lcdfilter;
 498     }
 499   if (strlen (buf) > 0) strcat (buf, ", ");
 500   sprintf (buf+strlen (buf), "LCDFilter: %d", oldsettings.lcdfilter);
 501
 502   if ((settings->seen & SEEN_HINTSTYLE) != 0
 503       && oldsettings.hintstyle != settings->hintstyle)
 504     {
 505       FcPatternDel (pat, FC_HINT_STYLE);
 506       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 507       ++changed;
 508       oldsettings.hintstyle = settings->hintstyle;
 509     }
 510   if (strlen (buf) > 0) strcat (buf, ", ");
 511   sprintf (buf+strlen (buf), "Hintstyle: %d", oldsettings.hintstyle);
 512
 513   if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
 514       && settings->dpi > 0)
 515     {
 516       Lisp_Object frame, tail;
 517
 518       FcPatternDel (pat, FC_DPI);
 519       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 520       ++changed;
 521       oldsettings.dpi = settings->dpi;
 522
 523       /* Change the DPI on this display and all frames on the display.  */
 524       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 525       FOR_EACH_FRAME (tail, frame)
 526         if (FRAME_X_P (XFRAME (frame))
 527             && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
 528           XFRAME (frame)->resy = XFRAME (frame)->resx = settings->dpi;
 529     }
 530
 531   if (strlen (buf) > 0) strcat (buf, ", ");
 532   sprintf (buf+strlen (buf), "DPI: %lf", oldsettings.dpi);
 533
 534   if (changed)
 535     {
 536       XftDefaultSet (dpyinfo->display, pat);
 537       if (send_event_p)
 538         store_config_changed_event (Qfont_render,
 539                                     XCAR (dpyinfo->name_list_element));
 540       Vxft_settings = make_string (buf, strlen (buf));
 541     }
 542   else
 543     FcPatternDestroy (pat);
 544 #endif /* HAVE_XFT */
 545 }
 546
 547 static void
 548 read_and_apply_settings (dpyinfo, send_event_p)
 549      struct x_display_info *dpyinfo;
 550      int send_event_p;
 551 {
 552   struct xsettings settings;
 553   Lisp_Object dpyname = XCAR (dpyinfo->name_list_element);
 554
 555   if (!read_settings (dpyinfo, &settings))
 556     return;
 557
 558   apply_xft_settings (dpyinfo, True, &settings);
 559   if (settings.seen & SEEN_TB_STYLE)
 560     {
 561       Lisp_Object style = Qnil;
 562       if (strcmp (settings.tb_style, "both") == 0)
 563         style = Qboth;
 564       else if (strcmp (settings.tb_style, "both-horiz") == 0)
 565         style = Qboth_horiz;
 566       else if (strcmp (settings.tb_style, "icons") == 0)
 567         style = Qimage;
 568       else if (strcmp (settings.tb_style, "text") == 0)
 569         style = Qtext;
 570       if (!NILP (style) && !EQ (style, current_tool_bar_style))
 571         {
 572           current_tool_bar_style = style;
 573           if (send_event_p)
 574             store_config_changed_event (Qtool_bar_style, dpyname);
 575         }
 576       free (settings.tb_style);
 577     }
 578
 579   if (settings.seen & SEEN_FONT)
 580     {
 581       if (!current_font || strcmp (current_font, settings.font) != 0)
 582         {
 583           free (current_font);
 584           current_font = settings.font;
 585           if (send_event_p)
 586             store_config_changed_event (Qfont_name, dpyname);
 587         }
 588       else
 589         free (settings.font);
 590     }
 591 }
 592
 593 void
 594 xft_settings_event (dpyinfo, event)
 595      struct x_display_info *dpyinfo;
 596      XEvent *event;
 597 {
 598   int check_window_p = 0;
 599   int apply_settings = 0;
 600
 601   switch (event->type)
 602     {
 603     case DestroyNotify:
 604       if (dpyinfo->xsettings_window == event->xany.window)
 605         check_window_p = 1;
 606       break;
 607
 608     case ClientMessage:
 609       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 610           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 611           && event->xclient.window == dpyinfo->root_window)
 612         check_window_p = 1;
 613       break;
 614
 615     case PropertyNotify:
 616       if (event->xproperty.window == dpyinfo->xsettings_window
 617           && event->xproperty.state == PropertyNewValue
 618           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 619         apply_settings = 1;
 620       break;
 621     }
 622
 623
 624   if (check_window_p)
 625     {
 626       dpyinfo->xsettings_window = None;
 627       get_prop_window (dpyinfo);
 628       if (dpyinfo->xsettings_window != None)
 629         apply_settings = 1;
 630     }
 631
 632   if (apply_settings)
 633     read_and_apply_settings (dpyinfo, True);
 634 }
 635
 636
 637 static void
 638 init_gconf ()
 639 {
 640 #if defined (HAVE_GCONF) && defined (HAVE_XFT)
 641   int i;
 642   char *s;
 643
 644   g_type_init ();
 645   gconf_client = gconf_client_get_default ();
 646   s = gconf_client_get_string (gconf_client, SYSTEM_MONO_FONT, NULL);
 647   if (s)
 648     {
 649       current_mono_font = xstrdup (s);
 650       g_free (s);
 651     }
 652   s = gconf_client_get_string (gconf_client, SYSTEM_FONT, NULL);
 653   if (s)
 654     {
 655       current_font = xstrdup (s);
 656       g_free (s);
 657     }
 658   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 659   gconf_client_add_dir (gconf_client,
 660                         SYSTEM_MONO_FONT,
 661                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 662                         NULL);
 663   gconf_client_notify_add (gconf_client,
 664                            SYSTEM_MONO_FONT,
 665                            something_changedCB,
 666                            NULL, NULL, NULL);
 667 #endif /* HAVE_GCONF && HAVE_XFT */
 668 }
 669
 670 static void
 671 init_xsettings (dpyinfo)
 672      struct x_display_info *dpyinfo;
 673 {
 674   char sel[64];
 675   Display *dpy = dpyinfo->display;
 676
 677   BLOCK_INPUT;
 678
 679   sprintf (sel, "_XSETTINGS_S%d", XScreenNumberOfScreen (dpyinfo->screen));
 680   dpyinfo->Xatom_xsettings_sel = XInternAtom (dpy, sel, False);
 681   dpyinfo->Xatom_xsettings_prop = XInternAtom (dpy,
 682                                                "_XSETTINGS_SETTINGS",
 683                                                False);
 684   dpyinfo->Xatom_xsettings_mgr = XInternAtom (dpy, "MANAGER", False);
 685
 686   /* Select events so we can detect client messages sent when selection
 687      owner changes.  */
 688   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 689
 690   get_prop_window (dpyinfo);
 691   if (dpyinfo->xsettings_window != None)
 692     read_and_apply_settings (dpyinfo, False);
 693
 694   UNBLOCK_INPUT;
 695 }
 696
 697 void
 698 xsettings_initialize (dpyinfo)
 699      struct x_display_info *dpyinfo;
 700 {
 701   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 702   init_gconf ();
 703   init_xsettings (dpyinfo);
 704 }
 705
 706 const char *
 707 xsettings_get_system_font ()
 708 {
 709   return current_mono_font;
 710 }
 711
 712 const char *
 713 xsettings_get_system_normal_font ()
 714 {
 715   return current_font;
 716 }
 717
 718 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 719        Sfont_get_system_normal_font,
 720        0, 0, 0,
 721        doc: /* Get the system default font. */)
 722   ()
 723 {
 724   return current_font && use_system_font
 725     ? make_string (current_font, strlen (current_font))
 726     : Qnil;
 727 }
 728
 729 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 730        0, 0, 0,
 731        doc: /* Get the system default monospaced font. */)
 732   ()
 733 {
 734   return current_mono_font && use_system_font
 735     ? make_string (current_mono_font, strlen (current_mono_font))
 736     : Qnil;
 737 }
 738
 739 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style, Stool_bar_get_system_style,
 740        0, 0, 0,
 741        doc: /* Get the system tool bar style.
 742 If no system tool bar style is known, return `tool-bar-style' is set to a
 743 known style.  Otherwise return image.  */)
 744   ()
 745 {
 746   if (EQ (Vtool_bar_style, Qimage)
 747       || EQ (Vtool_bar_style, Qtext)
 748       || EQ (Vtool_bar_style, Qboth)
 749       || EQ (Vtool_bar_style, Qboth_horiz))
 750     return Vtool_bar_style;
 751   if (!NILP (current_tool_bar_style))
 752     return current_tool_bar_style;
 753   return Qimage;
 754 }
 755
 756 void
 757 syms_of_xsettings ()
 758 {
 759   current_mono_font = NULL;
 760   current_font = NULL;
 761   first_dpyinfo = NULL;
 762 #ifdef HAVE_GCONF
 763   gconf_client = NULL;
 764 #endif
 765
 766   Qmonospace_font_name = intern_c_string ("monospace-font-name");
 767   staticpro (&Qmonospace_font_name);
 768   Qfont_name = intern_c_string ("font-name");
 769   staticpro (&Qfont_name);
 770   Qfont_render = intern_c_string ("font-render");
 771   staticpro (&Qfont_render);
 772   defsubr (&Sfont_get_system_font);
 773   defsubr (&Sfont_get_system_normal_font);
 774
 775   DEFVAR_BOOL ("font-use-system-font", &use_system_font,
 776     doc: /* *Non-nil means to use the system defined font.  */);
 777   use_system_font = 0;
 778
 779   DEFVAR_LISP ("xft-settings", &Vxft_settings,
 780                doc: /* Font settings applied to Xft.  */);
 781   Vxft_settings = make_string ("", 0);
 782
 783 #ifdef HAVE_XFT
 784   Fprovide (intern_c_string ("font-render-setting"), Qnil);
 785 #ifdef HAVE_GCONF
 786   Fprovide (intern_c_string ("system-font-setting"), Qnil);
 787 #endif
 788 #endif
 789
 790   current_tool_bar_style = Qnil;
 791   Qtool_bar_style = intern_c_string ("tool-bar-style");
 792   staticpro (&Qtool_bar_style);
 793   defsubr (&Stool_bar_get_system_style);
 794
 795   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
 796 }
 797
 798 /* arch-tag: 541716ed-2e6b-42e1-8212-3197e01ea61d
 799    (do not change this comment) */