src/xsettings.c

   1 /* Functions for handling font and other changes dynamically.
   2
   3 Copyright (C) 2009-2011  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 <limits.h>
  22 #include <setjmp.h>
  23 #include <fcntl.h>
  24 #include "lisp.h"
  25 #include "xterm.h"
  26 #include "xsettings.h"
  27 #include "frame.h"
  28 #include "keyboard.h"
  29 #include "blockinput.h"
  30 #include "termhooks.h"
  31 #include "termopts.h"
  32
  33 #include <X11/Xproto.h>
  34
  35 #ifdef HAVE_GCONF
  36 #include <gconf/gconf-client.h>
  37 #endif
  38 #ifdef HAVE_XFT
  39 #include <X11/Xft/Xft.h>
  40 #endif
  41
  42 static char *current_mono_font;
  43 static char *current_font;
  44 static struct x_display_info *first_dpyinfo;
  45 static Lisp_Object Qmonospace_font_name, Qfont_name, Qfont_render,
  46   Qtool_bar_style;
  47 static Lisp_Object current_tool_bar_style;
  48
  49 #ifdef HAVE_GCONF
  50 static GConfClient *gconf_client;
  51 #endif
  52
  53
  54 static void
  55 store_config_changed_event (Lisp_Object arg, Lisp_Object display_name)
  56 {
  57   struct input_event event;
  58   EVENT_INIT (event);
  59   event.kind = CONFIG_CHANGED_EVENT;
  60   event.frame_or_window = display_name;
  61   event.arg = arg;
  62   kbd_buffer_store_event (&event);
  63 }
  64
  65 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
  66 #define XSETTINGS_TOOL_BAR_STYLE  "Gtk/ToolbarStyle"
  67
  68 enum {
  69   SEEN_AA         = 0x01,
  70   SEEN_HINTING    = 0x02,
  71   SEEN_RGBA       = 0x04,
  72   SEEN_LCDFILTER  = 0x08,
  73   SEEN_HINTSTYLE  = 0x10,
  74   SEEN_DPI        = 0x20,
  75   SEEN_FONT       = 0x40,
  76   SEEN_TB_STYLE   = 0x80,
  77 };
  78 struct xsettings
  79 {
  80 #ifdef HAVE_XFT
  81   FcBool aa, hinting;
  82   int rgba, lcdfilter, hintstyle;
  83   double dpi;
  84 #endif
  85
  86   char *font;
  87   char *tb_style;
  88
  89   unsigned seen;
  90 };
  91
  92 #ifdef HAVE_GCONF
  93
  94 #define SYSTEM_MONO_FONT     "/desktop/gnome/interface/monospace_font_name"
  95 #define SYSTEM_FONT          "/desktop/gnome/interface/font_name"
  96
  97 /* Callback called when something changed in GConf that we care about,
  98    that is SYSTEM_MONO_FONT.  */
  99
 100 static void
 101 something_changedCB (GConfClient *client,
 102                      guint cnxn_id,
 103                      GConfEntry *entry,
 104                      gpointer user_data)
 105 {
 106   GConfValue *v = gconf_entry_get_value (entry);
 107
 108   if (!v) return;
 109   if (v->type == GCONF_VALUE_STRING)
 110     {
 111       const char *value = gconf_value_get_string (v);
 112       if (current_mono_font != NULL && strcmp (value, current_mono_font) == 0)
 113         return; /* No change. */
 114
 115       xfree (current_mono_font);
 116       current_mono_font = xstrdup (value);
 117     }
 118
 119
 120   if (first_dpyinfo != NULL)
 121     {
 122       /* Check if display still open */
 123       struct x_display_info *dpyinfo;
 124       int found = 0;
 125       for (dpyinfo = x_display_list; !found && dpyinfo; dpyinfo = dpyinfo->next)
 126         found = dpyinfo == first_dpyinfo;
 127
 128       if (found && use_system_font)
 129         store_config_changed_event (Qmonospace_font_name,
 130                                     XCAR (first_dpyinfo->name_list_element));
 131     }
 132 }
 133 #endif /* HAVE_GCONF */
 134
 135 #ifdef HAVE_XFT
 136
 137 /* Older fontconfig versions don't have FC_LCD_*.  */
 138 #ifndef FC_LCD_NONE
 139 #define FC_LCD_NONE 0
 140 #endif
 141 #ifndef FC_LCD_DEFAULT
 142 #define FC_LCD_DEFAULT 1
 143 #endif
 144 #ifndef FC_LCD_FILTER
 145 #define FC_LCD_FILTER "lcdfilter"
 146 #endif
 147
 148 #endif /* HAVE_XFT */
 149
 150 /* Find the window that contains the XSETTINGS property values.  */
 151
 152 static void
 153 get_prop_window (struct x_display_info *dpyinfo)
 154 {
 155   Display *dpy = dpyinfo->display;
 156
 157   XGrabServer (dpy);
 158   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 159                                                   dpyinfo->Xatom_xsettings_sel);
 160   if (dpyinfo->xsettings_window != None)
 161     /* Select events so we can detect if window is deleted or if settings
 162        are changed.  */
 163     XSelectInput (dpy, dpyinfo->xsettings_window,
 164                   PropertyChangeMask|StructureNotifyMask);
 165
 166   XUngrabServer (dpy);
 167 }
 168
 169 #define SWAP32(nr) (((nr) << 24) | (((nr) << 8) & 0xff0000)     \
 170                     | (((nr) >> 8) & 0xff00) | ((nr) >> 24))
 171 #define SWAP16(nr) (((nr) << 8) | ((nr) >> 8))
 172 #define PAD(nr)    (((nr) + 3) & ~3)
 173
 174 /* Parse xsettings and extract those that deal with Xft.
 175    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 176    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 177
 178    Layout of prop.  First is a header:
 179
 180    bytes   type     what
 181    ------------------------------------
 182    1      CARD8    byte-order
 183    3               unused
 184    4      CARD32   SERIAL
 185    4      CARD32   N_SETTINGS
 186
 187    Then N_SETTINGS records, with header:
 188
 189    bytes   type          what
 190    ------------------------------------
 191    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 192    1                    unused
 193    2      CARD16        n == name-length
 194    n      STRING8       name
 195    p                    unused, p=pad_to_even_4(n)
 196    4      CARD32        last-change-serial
 197
 198    and then the value, For string:
 199
 200    bytes   type          what
 201    ------------------------------------
 202    4      CARD32        n = value-length
 203    n      STRING8       value
 204    p                    unused, p=pad_to_even_4(n)
 205
 206    For integer:
 207
 208    bytes   type          what
 209    ------------------------------------
 210    4      INT32         value
 211
 212    For RGB color:
 213
 214    bytes   type          what
 215    ------------------------------------
 216    2      CARD16        red
 217    2      CARD16        blue
 218    2      CARD16        green
 219    2      CARD16        alpha
 220
 221    Returns non-zero if some Xft settings was seen, zero otherwise.
 222 */
 223
 224 static int
 225 parse_settings (unsigned char *prop,
 226                 long unsigned int bytes,
 227                 struct xsettings *settings)
 228 {
 229   Lisp_Object byteorder = Fbyteorder ();
 230   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 231   int that_bo = prop[0];
 232   CARD32 n_settings;
 233   int bytes_parsed = 0;
 234   int settings_seen = 0;
 235   int i = 0;
 236
 237   /* First 4 bytes is a serial number, skip that.  */
 238
 239   if (bytes < 12) return BadLength;
 240   memcpy (&n_settings, prop+8, 4);
 241   if (my_bo != that_bo) n_settings = SWAP32 (n_settings);
 242   bytes_parsed = 12;
 243
 244   memset (settings, 0, sizeof (*settings));
 245
 246   while (bytes_parsed+4 < bytes && settings_seen < 7
 247          && i < n_settings)
 248     {
 249       int type = prop[bytes_parsed++];
 250       CARD16 nlen;
 251       CARD32 vlen, ival = 0;
 252       char name[128]; /* The names we are looking for are not this long.  */
 253       char sval[128]; /* The values we are looking for are not this long.  */
 254       int want_this;
 255       int to_cpy;
 256
 257       sval[0] = '\0';
 258       ++i;
 259       ++bytes_parsed; /* Padding */
 260
 261       memcpy (&nlen, prop+bytes_parsed, 2);
 262       bytes_parsed += 2;
 263       if (my_bo != that_bo) nlen = SWAP16 (nlen);
 264       if (bytes_parsed+nlen > bytes) return BadLength;
 265       to_cpy = nlen > 127 ? 127 : nlen;
 266       memcpy (name, prop+bytes_parsed, to_cpy);
 267       name[to_cpy] = '\0';
 268
 269       bytes_parsed += nlen;
 270       bytes_parsed = PAD (bytes_parsed);
 271
 272       bytes_parsed += 4; /* Skip serial for this value */
 273       if (bytes_parsed > bytes) return BadLength;
 274
 275       want_this =
 276 #ifdef HAVE_XFT
 277         (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
 278         ||
 279 #endif
 280         (strcmp (XSETTINGS_FONT_NAME, name) == 0)
 281         || (strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0);
 282
 283       switch (type)
 284         {
 285         case 0: /* Integer */
 286           if (bytes_parsed+4 > bytes) return BadLength;
 287           if (want_this)
 288             {
 289               memcpy (&ival, prop+bytes_parsed, 4);
 290               if (my_bo != that_bo) ival = SWAP32 (ival);
 291             }
 292           bytes_parsed += 4;
 293           break;
 294
 295         case 1: /* String */
 296           if (bytes_parsed+4 > bytes) return BadLength;
 297           memcpy (&vlen, prop+bytes_parsed, 4);
 298           bytes_parsed += 4;
 299           if (my_bo != that_bo) vlen = SWAP32 (vlen);
 300           if (want_this)
 301             {
 302               to_cpy = vlen > 127 ? 127 : vlen;
 303               memcpy (sval, prop+bytes_parsed, to_cpy);
 304               sval[to_cpy] = '\0';
 305             }
 306           bytes_parsed += vlen;
 307           bytes_parsed = PAD (bytes_parsed);
 308           break;
 309
 310         case 2: /* RGB value */
 311           /* No need to parse this */
 312           if (bytes_parsed+8 > bytes) return BadLength;
 313           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 314           break;
 315
 316         default: /* Parse Error */
 317           return BadValue;
 318         }
 319
 320       if (want_this)
 321         {
 322           ++settings_seen;
 323           if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 324             {
 325               settings->font = xstrdup (sval);
 326               settings->seen |= SEEN_FONT;
 327             }
 328           else if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 329             {
 330               settings->tb_style = xstrdup (sval);
 331               settings->seen |= SEEN_TB_STYLE;
 332             }
 333 #ifdef HAVE_XFT
 334           else if (strcmp (name, "Xft/Antialias") == 0)
 335             {
 336               settings->seen |= SEEN_AA;
 337               settings->aa = ival != 0;
 338             }
 339           else if (strcmp (name, "Xft/Hinting") == 0)
 340             {
 341               settings->seen |= SEEN_HINTING;
 342               settings->hinting = ival != 0;
 343             }
 344 # ifdef FC_HINT_STYLE
 345           else if (strcmp (name, "Xft/HintStyle") == 0)
 346             {
 347               settings->seen |= SEEN_HINTSTYLE;
 348               if (strcmp (sval, "hintnone") == 0)
 349                 settings->hintstyle = FC_HINT_NONE;
 350               else if (strcmp (sval, "hintslight") == 0)
 351                 settings->hintstyle = FC_HINT_SLIGHT;
 352               else if (strcmp (sval, "hintmedium") == 0)
 353                 settings->hintstyle = FC_HINT_MEDIUM;
 354               else if (strcmp (sval, "hintfull") == 0)
 355                 settings->hintstyle = FC_HINT_FULL;
 356               else
 357                 settings->seen &= ~SEEN_HINTSTYLE;
 358             }
 359 # endif
 360           else if (strcmp (name, "Xft/RGBA") == 0)
 361             {
 362               settings->seen |= SEEN_RGBA;
 363               if (strcmp (sval, "none") == 0)
 364                 settings->rgba = FC_RGBA_NONE;
 365               else if (strcmp (sval, "rgb") == 0)
 366                 settings->rgba = FC_RGBA_RGB;
 367               else if (strcmp (sval, "bgr") == 0)
 368                 settings->rgba = FC_RGBA_BGR;
 369               else if (strcmp (sval, "vrgb") == 0)
 370                 settings->rgba = FC_RGBA_VRGB;
 371               else if (strcmp (sval, "vbgr") == 0)
 372                 settings->rgba = FC_RGBA_VBGR;
 373               else
 374                 settings->seen &= ~SEEN_RGBA;
 375             }
 376           else if (strcmp (name, "Xft/DPI") == 0)
 377             {
 378               settings->seen |= SEEN_DPI;
 379               settings->dpi = (double)ival/1024.0;
 380             }
 381           else if (strcmp (name, "Xft/lcdfilter") == 0)
 382             {
 383               settings->seen |= SEEN_LCDFILTER;
 384               if (strcmp (sval, "none") == 0)
 385                 settings->lcdfilter = FC_LCD_NONE;
 386               else if (strcmp (sval, "lcddefault") == 0)
 387                 settings->lcdfilter = FC_LCD_DEFAULT;
 388               else
 389                 settings->seen &= ~SEEN_LCDFILTER;
 390             }
 391 #endif /* HAVE_XFT */
 392         }
 393     }
 394
 395   return settings_seen;
 396 }
 397
 398 static int
 399 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
 400 {
 401   Atom act_type;
 402   int act_form;
 403   unsigned long nitems, bytes_after;
 404   unsigned char *prop = NULL;
 405   Display *dpy = dpyinfo->display;
 406   int rc;
 407
 408   x_catch_errors (dpy);
 409   rc = XGetWindowProperty (dpy,
 410                            dpyinfo->xsettings_window,
 411                            dpyinfo->Xatom_xsettings_prop,
 412                            0, LONG_MAX, False, AnyPropertyType,
 413                            &act_type, &act_form, &nitems, &bytes_after,
 414                            &prop);
 415
 416   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 417       && act_type == dpyinfo->Xatom_xsettings_prop)
 418     rc = parse_settings (prop, nitems, settings);
 419
 420   XFree (prop);
 421
 422   x_uncatch_errors ();
 423
 424   return rc != 0;
 425 }
 426
 427
 428 static void
 429 apply_xft_settings (struct x_display_info *dpyinfo,
 430                     int send_event_p,
 431                     struct xsettings *settings)
 432 {
 433 #ifdef HAVE_XFT
 434   FcPattern *pat;
 435   struct xsettings oldsettings;
 436   int changed = 0;
 437   char buf[256];
 438
 439   memset (&oldsettings, 0, sizeof (oldsettings));
 440   buf[0] = '\0';
 441   pat = FcPatternCreate ();
 442   XftDefaultSubstitute (dpyinfo->display,
 443                         XScreenNumberOfScreen (dpyinfo->screen),
 444                         pat);
 445   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 446   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 447 # ifdef FC_HINT_STYLE
 448   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 449 # endif
 450   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 451   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 452   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 453
 454   if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
 455     {
 456       FcPatternDel (pat, FC_ANTIALIAS);
 457       FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
 458       ++changed;
 459       oldsettings.aa = settings->aa;
 460     }
 461   sprintf (buf, "Antialias: %d", oldsettings.aa);
 462
 463   if ((settings->seen & SEEN_HINTING) != 0
 464       && oldsettings.hinting != settings->hinting)
 465     {
 466       FcPatternDel (pat, FC_HINTING);
 467       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 468       ++changed;
 469       oldsettings.hinting = settings->hinting;
 470     }
 471   if (strlen (buf) > 0) strcat (buf, ", ");
 472   sprintf (buf+strlen (buf), "Hinting: %d", oldsettings.hinting);
 473   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 474     {
 475       FcPatternDel (pat, FC_RGBA);
 476       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 477       oldsettings.rgba = settings->rgba;
 478       ++changed;
 479     }
 480   if (strlen (buf) > 0) strcat (buf, ", ");
 481   sprintf (buf+strlen (buf), "RGBA: %d", oldsettings.rgba);
 482
 483   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 484   if ((settings->seen & SEEN_LCDFILTER) != 0
 485       && oldsettings.lcdfilter != settings->lcdfilter)
 486     {
 487       FcPatternDel (pat, FC_LCD_FILTER);
 488       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 489       ++changed;
 490       oldsettings.lcdfilter = settings->lcdfilter;
 491     }
 492   if (strlen (buf) > 0) strcat (buf, ", ");
 493   sprintf (buf+strlen (buf), "LCDFilter: %d", oldsettings.lcdfilter);
 494
 495 # ifdef FC_HINT_STYLE
 496   if ((settings->seen & SEEN_HINTSTYLE) != 0
 497       && oldsettings.hintstyle != settings->hintstyle)
 498     {
 499       FcPatternDel (pat, FC_HINT_STYLE);
 500       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 501       ++changed;
 502       oldsettings.hintstyle = settings->hintstyle;
 503     }
 504 # endif
 505   if (strlen (buf) > 0) strcat (buf, ", ");
 506   sprintf (buf+strlen (buf), "Hintstyle: %d", oldsettings.hintstyle);
 507
 508   if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
 509       && settings->dpi > 0)
 510     {
 511       Lisp_Object frame, tail;
 512
 513       FcPatternDel (pat, FC_DPI);
 514       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 515       ++changed;
 516       oldsettings.dpi = settings->dpi;
 517
 518       /* Change the DPI on this display and all frames on the display.  */
 519       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 520       FOR_EACH_FRAME (tail, frame)
 521         if (FRAME_X_P (XFRAME (frame))
 522             && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
 523           XFRAME (frame)->resy = XFRAME (frame)->resx = settings->dpi;
 524     }
 525
 526   if (strlen (buf) > 0) strcat (buf, ", ");
 527   sprintf (buf+strlen (buf), "DPI: %lf", oldsettings.dpi);
 528
 529   if (changed)
 530     {
 531       XftDefaultSet (dpyinfo->display, pat);
 532       if (send_event_p)
 533         store_config_changed_event (Qfont_render,
 534                                     XCAR (dpyinfo->name_list_element));
 535       Vxft_settings = make_string (buf, strlen (buf));
 536     }
 537   else
 538     FcPatternDestroy (pat);
 539 #endif /* HAVE_XFT */
 540 }
 541
 542 static void
 543 read_and_apply_settings (struct x_display_info *dpyinfo, int send_event_p)
 544 {
 545   struct xsettings settings;
 546   Lisp_Object dpyname = XCAR (dpyinfo->name_list_element);
 547
 548   if (!read_settings (dpyinfo, &settings))
 549     return;
 550
 551   apply_xft_settings (dpyinfo, True, &settings);
 552   if (settings.seen & SEEN_TB_STYLE)
 553     {
 554       Lisp_Object style = Qnil;
 555       if (strcmp (settings.tb_style, "both") == 0)
 556         style = Qboth;
 557       else if (strcmp (settings.tb_style, "both-horiz") == 0)
 558         style = Qboth_horiz;
 559       else if (strcmp (settings.tb_style, "icons") == 0)
 560         style = Qimage;
 561       else if (strcmp (settings.tb_style, "text") == 0)
 562         style = Qtext;
 563       if (!NILP (style) && !EQ (style, current_tool_bar_style))
 564         {
 565           current_tool_bar_style = style;
 566           if (send_event_p)
 567             store_config_changed_event (Qtool_bar_style, dpyname);
 568         }
 569       xfree (settings.tb_style);
 570     }
 571
 572   if (settings.seen & SEEN_FONT)
 573     {
 574       if (!current_font || strcmp (current_font, settings.font) != 0)
 575         {
 576           xfree (current_font);
 577           current_font = settings.font;
 578           if (send_event_p)
 579             store_config_changed_event (Qfont_name, dpyname);
 580         }
 581       else
 582         xfree (settings.font);
 583     }
 584 }
 585
 586 void
 587 xft_settings_event (struct x_display_info *dpyinfo, XEvent *event)
 588 {
 589   int check_window_p = 0;
 590   int apply_settings = 0;
 591
 592   switch (event->type)
 593     {
 594     case DestroyNotify:
 595       if (dpyinfo->xsettings_window == event->xany.window)
 596         check_window_p = 1;
 597       break;
 598
 599     case ClientMessage:
 600       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 601           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 602           && event->xclient.window == dpyinfo->root_window)
 603         check_window_p = 1;
 604       break;
 605
 606     case PropertyNotify:
 607       if (event->xproperty.window == dpyinfo->xsettings_window
 608           && event->xproperty.state == PropertyNewValue
 609           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 610         apply_settings = 1;
 611       break;
 612     }
 613
 614
 615   if (check_window_p)
 616     {
 617       dpyinfo->xsettings_window = None;
 618       get_prop_window (dpyinfo);
 619       if (dpyinfo->xsettings_window != None)
 620         apply_settings = 1;
 621     }
 622
 623   if (apply_settings)
 624     read_and_apply_settings (dpyinfo, True);
 625 }
 626
 627
 628 static void
 629 init_gconf (void)
 630 {
 631 #if defined (HAVE_GCONF) && defined (HAVE_XFT)
 632   char *s;
 633
 634 #ifdef HAVE_G_TYPE_INIT
 635   g_type_init ();
 636 #endif
 637   gconf_client = gconf_client_get_default ();
 638   s = gconf_client_get_string (gconf_client, SYSTEM_MONO_FONT, NULL);
 639   if (s)
 640     {
 641       current_mono_font = xstrdup (s);
 642       g_free (s);
 643     }
 644   s = gconf_client_get_string (gconf_client, SYSTEM_FONT, NULL);
 645   if (s)
 646     {
 647       current_font = xstrdup (s);
 648       g_free (s);
 649     }
 650   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 651   gconf_client_add_dir (gconf_client,
 652                         SYSTEM_MONO_FONT,
 653                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 654                         NULL);
 655   gconf_client_notify_add (gconf_client,
 656                            SYSTEM_MONO_FONT,
 657                            something_changedCB,
 658                            NULL, NULL, NULL);
 659 #endif /* HAVE_GCONF && HAVE_XFT */
 660 }
 661
 662 static void
 663 init_xsettings (struct x_display_info *dpyinfo)
 664 {
 665   Display *dpy = dpyinfo->display;
 666
 667   BLOCK_INPUT;
 668
 669   /* Select events so we can detect client messages sent when selection
 670      owner changes.  */
 671   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 672
 673   get_prop_window (dpyinfo);
 674   if (dpyinfo->xsettings_window != None)
 675     read_and_apply_settings (dpyinfo, False);
 676
 677   UNBLOCK_INPUT;
 678 }
 679
 680 void
 681 xsettings_initialize (struct x_display_info *dpyinfo)
 682 {
 683   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 684   init_gconf ();
 685   init_xsettings (dpyinfo);
 686 }
 687
 688 const char *
 689 xsettings_get_system_font (void)
 690 {
 691   return current_mono_font;
 692 }
 693
 694 #ifdef USE_LUCID
 695 const char *
 696 xsettings_get_system_normal_font (void)
 697 {
 698   return current_font;
 699 }
 700 #endif
 701
 702 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 703        Sfont_get_system_normal_font,
 704        0, 0, 0,
 705        doc: /* Get the system default application font. */)
 706   (void)
 707 {
 708   return current_font
 709     ? make_string (current_font, strlen (current_font))
 710     : Qnil;
 711 }
 712
 713 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 714        0, 0, 0,
 715        doc: /* Get the system default fixed width font. */)
 716   (void)
 717 {
 718   return current_mono_font
 719     ? make_string (current_mono_font, strlen (current_mono_font))
 720     : Qnil;
 721 }
 722
 723 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
 724        Stool_bar_get_system_style, 0, 0, 0,
 725        doc: /* Get the system tool bar style.
 726 If no system tool bar style is known, return `tool-bar-style' if set to a
 727 known style.  Otherwise return image.  */)
 728   (void)
 729 {
 730   if (EQ (Vtool_bar_style, Qimage)
 731       || EQ (Vtool_bar_style, Qtext)
 732       || EQ (Vtool_bar_style, Qboth)
 733       || EQ (Vtool_bar_style, Qboth_horiz)
 734       || EQ (Vtool_bar_style, Qtext_image_horiz))
 735     return Vtool_bar_style;
 736   if (!NILP (current_tool_bar_style))
 737     return current_tool_bar_style;
 738   return Qimage;
 739 }
 740
 741 void
 742 syms_of_xsettings (void)
 743 {
 744   current_mono_font = NULL;
 745   current_font = NULL;
 746   first_dpyinfo = NULL;
 747 #ifdef HAVE_GCONF
 748   gconf_client = NULL;
 749 #endif
 750
 751   Qmonospace_font_name = intern_c_string ("monospace-font-name");
 752   staticpro (&Qmonospace_font_name);
 753   Qfont_name = intern_c_string ("font-name");
 754   staticpro (&Qfont_name);
 755   Qfont_render = intern_c_string ("font-render");
 756   staticpro (&Qfont_render);
 757   defsubr (&Sfont_get_system_font);
 758   defsubr (&Sfont_get_system_normal_font);
 759
 760   DEFVAR_BOOL ("font-use-system-font", use_system_font,
 761     doc: /* *Non-nil means to apply the system defined font dynamically.
 762 When this is non-nil and the system defined fixed width font changes, we
 763 update frames dynamically.
 764 If this variable is nil, Emacs ignores system font changes.  */);
 765   use_system_font = 0;
 766
 767   DEFVAR_LISP ("xft-settings", Vxft_settings,
 768                doc: /* Font settings applied to Xft.  */);
 769   Vxft_settings = make_string ("", 0);
 770
 771 #ifdef HAVE_XFT
 772   Fprovide (intern_c_string ("font-render-setting"), Qnil);
 773 #ifdef HAVE_GCONF
 774   Fprovide (intern_c_string ("system-font-setting"), Qnil);
 775 #endif
 776 #endif
 777
 778   current_tool_bar_style = Qnil;
 779   Qtool_bar_style = intern_c_string ("tool-bar-style");
 780   staticpro (&Qtool_bar_style);
 781   defsubr (&Stool_bar_get_system_style);
 782
 783   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
 784 }