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
  22 #include <float.h>
  23 #include <limits.h>
  24 #include <setjmp.h>
  25 #include <fcntl.h>
  26 #include "lisp.h"
  27 #include "xterm.h"
  28 #include "xsettings.h"
  29 #include "frame.h"
  30 #include "keyboard.h"
  31 #include "blockinput.h"
  32 #include "termhooks.h"
  33 #include "termopts.h"
  34
  35 #include <X11/Xproto.h>
  36
  37 #ifdef HAVE_GCONF
  38 #include <gconf/gconf-client.h>
  39 #endif
  40 #ifdef HAVE_XFT
  41 #include <X11/Xft/Xft.h>
  42 #endif
  43
  44 static char *current_mono_font;
  45 static char *current_font;
  46 static struct x_display_info *first_dpyinfo;
  47 static Lisp_Object Qmonospace_font_name, Qfont_name, Qfont_render,
  48   Qtool_bar_style;
  49 static Lisp_Object current_tool_bar_style;
  50
  51 #ifdef HAVE_GCONF
  52 static GConfClient *gconf_client;
  53 #endif
  54
  55
  56 static void
  57 store_config_changed_event (Lisp_Object arg, Lisp_Object display_name)
  58 {
  59   struct input_event event;
  60   EVENT_INIT (event);
  61   event.kind = CONFIG_CHANGED_EVENT;
  62   event.frame_or_window = display_name;
  63   event.arg = arg;
  64   kbd_buffer_store_event (&event);
  65 }
  66
  67 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
  68 #define XSETTINGS_TOOL_BAR_STYLE  "Gtk/ToolbarStyle"
  69
  70 enum {
  71   SEEN_AA         = 0x01,
  72   SEEN_HINTING    = 0x02,
  73   SEEN_RGBA       = 0x04,
  74   SEEN_LCDFILTER  = 0x08,
  75   SEEN_HINTSTYLE  = 0x10,
  76   SEEN_DPI        = 0x20,
  77   SEEN_FONT       = 0x40,
  78   SEEN_TB_STYLE   = 0x80,
  79 };
  80 struct xsettings
  81 {
  82 #ifdef HAVE_XFT
  83   FcBool aa, hinting;
  84   int rgba, lcdfilter, hintstyle;
  85   double dpi;
  86 #endif
  87
  88   char *font;
  89   char *tb_style;
  90
  91   unsigned seen;
  92 };
  93
  94 #ifdef HAVE_GCONF
  95
  96 #define SYSTEM_MONO_FONT     "/desktop/gnome/interface/monospace_font_name"
  97 #define SYSTEM_FONT          "/desktop/gnome/interface/font_name"
  98
  99 /* Callback called when something changed in GConf that we care about,
 100    that is SYSTEM_MONO_FONT.  */
 101
 102 static void
 103 something_changedCB (GConfClient *client,
 104                      guint cnxn_id,
 105                      GConfEntry *entry,
 106                      gpointer user_data)
 107 {
 108   GConfValue *v = gconf_entry_get_value (entry);
 109
 110   if (!v) return;
 111   if (v->type == GCONF_VALUE_STRING)
 112     {
 113       const char *value = gconf_value_get_string (v);
 114       if (current_mono_font != NULL && strcmp (value, current_mono_font) == 0)
 115         return; /* No change. */
 116
 117       xfree (current_mono_font);
 118       current_mono_font = xstrdup (value);
 119     }
 120
 121
 122   if (first_dpyinfo != NULL)
 123     {
 124       /* Check if display still open */
 125       struct x_display_info *dpyinfo;
 126       int found = 0;
 127       for (dpyinfo = x_display_list; !found && dpyinfo; dpyinfo = dpyinfo->next)
 128         found = dpyinfo == first_dpyinfo;
 129
 130       if (found && use_system_font)
 131         store_config_changed_event (Qmonospace_font_name,
 132                                     XCAR (first_dpyinfo->name_list_element));
 133     }
 134 }
 135 #endif /* HAVE_GCONF */
 136
 137 #ifdef HAVE_XFT
 138
 139 /* Older fontconfig versions don't have FC_LCD_*.  */
 140 #ifndef FC_LCD_NONE
 141 #define FC_LCD_NONE 0
 142 #endif
 143 #ifndef FC_LCD_DEFAULT
 144 #define FC_LCD_DEFAULT 1
 145 #endif
 146 #ifndef FC_LCD_FILTER
 147 #define FC_LCD_FILTER "lcdfilter"
 148 #endif
 149
 150 #endif /* HAVE_XFT */
 151
 152 /* Find the window that contains the XSETTINGS property values.  */
 153
 154 static void
 155 get_prop_window (struct x_display_info *dpyinfo)
 156 {
 157   Display *dpy = dpyinfo->display;
 158
 159   XGrabServer (dpy);
 160   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 161                                                   dpyinfo->Xatom_xsettings_sel);
 162   if (dpyinfo->xsettings_window != None)
 163     /* Select events so we can detect if window is deleted or if settings
 164        are changed.  */
 165     XSelectInput (dpy, dpyinfo->xsettings_window,
 166                   PropertyChangeMask|StructureNotifyMask);
 167
 168   XUngrabServer (dpy);
 169 }
 170
 171 #define SWAP32(nr) (((nr) << 24) | (((nr) << 8) & 0xff0000)     \
 172                     | (((nr) >> 8) & 0xff00) | ((nr) >> 24))
 173 #define SWAP16(nr) (((nr) << 8) | ((nr) >> 8))
 174 #define PAD(nr)    (((nr) + 3) & ~3)
 175
 176 /* Parse xsettings and extract those that deal with Xft.
 177    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 178    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 179
 180    Layout of prop.  First is a header:
 181
 182    bytes   type     what
 183    ------------------------------------
 184    1      CARD8    byte-order
 185    3               unused
 186    4      CARD32   SERIAL
 187    4      CARD32   N_SETTINGS
 188
 189    Then N_SETTINGS records, with header:
 190
 191    bytes   type          what
 192    ------------------------------------
 193    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 194    1                    unused
 195    2      CARD16        n == name-length
 196    n      STRING8       name
 197    p                    unused, p=pad_to_even_4(n)
 198    4      CARD32        last-change-serial
 199
 200    and then the value, For string:
 201
 202    bytes   type          what
 203    ------------------------------------
 204    4      CARD32        n = value-length
 205    n      STRING8       value
 206    p                    unused, p=pad_to_even_4(n)
 207
 208    For integer:
 209
 210    bytes   type          what
 211    ------------------------------------
 212    4      INT32         value
 213
 214    For RGB color:
 215
 216    bytes   type          what
 217    ------------------------------------
 218    2      CARD16        red
 219    2      CARD16        blue
 220    2      CARD16        green
 221    2      CARD16        alpha
 222
 223    Returns non-zero if some Xft settings was seen, zero otherwise.
 224 */
 225
 226 static int
 227 parse_settings (unsigned char *prop,
 228                 long unsigned int bytes,
 229                 struct xsettings *settings)
 230 {
 231   Lisp_Object byteorder = Fbyteorder ();
 232   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 233   int that_bo = prop[0];
 234   CARD32 n_settings;
 235   int bytes_parsed = 0;
 236   int settings_seen = 0;
 237   int i = 0;
 238
 239   /* First 4 bytes is a serial number, skip that.  */
 240
 241   if (bytes < 12) return BadLength;
 242   memcpy (&n_settings, prop+8, 4);
 243   if (my_bo != that_bo) n_settings = SWAP32 (n_settings);
 244   bytes_parsed = 12;
 245
 246   memset (settings, 0, sizeof (*settings));
 247
 248   while (bytes_parsed+4 < bytes && settings_seen < 7
 249          && i < n_settings)
 250     {
 251       int type = prop[bytes_parsed++];
 252       CARD16 nlen;
 253       CARD32 vlen, ival = 0;
 254       char name[128]; /* The names we are looking for are not this long.  */
 255       char sval[128]; /* The values we are looking for are not this long.  */
 256       int want_this;
 257       int to_cpy;
 258
 259       sval[0] = '\0';
 260       ++i;
 261       ++bytes_parsed; /* Padding */
 262
 263       memcpy (&nlen, prop+bytes_parsed, 2);
 264       bytes_parsed += 2;
 265       if (my_bo != that_bo) nlen = SWAP16 (nlen);
 266       if (bytes_parsed+nlen > bytes) return BadLength;
 267       to_cpy = nlen > 127 ? 127 : nlen;
 268       memcpy (name, prop+bytes_parsed, to_cpy);
 269       name[to_cpy] = '\0';
 270
 271       bytes_parsed += nlen;
 272       bytes_parsed = PAD (bytes_parsed);
 273
 274       bytes_parsed += 4; /* Skip serial for this value */
 275       if (bytes_parsed > bytes) return BadLength;
 276
 277       want_this =
 278 #ifdef HAVE_XFT
 279         (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
 280         ||
 281 #endif
 282         (strcmp (XSETTINGS_FONT_NAME, name) == 0)
 283         || (strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0);
 284
 285       switch (type)
 286         {
 287         case 0: /* Integer */
 288           if (bytes_parsed+4 > bytes) return BadLength;
 289           if (want_this)
 290             {
 291               memcpy (&ival, prop+bytes_parsed, 4);
 292               if (my_bo != that_bo) ival = SWAP32 (ival);
 293             }
 294           bytes_parsed += 4;
 295           break;
 296
 297         case 1: /* String */
 298           if (bytes_parsed+4 > bytes) return BadLength;
 299           memcpy (&vlen, prop+bytes_parsed, 4);
 300           bytes_parsed += 4;
 301           if (my_bo != that_bo) vlen = SWAP32 (vlen);
 302           if (want_this)
 303             {
 304               to_cpy = vlen > 127 ? 127 : vlen;
 305               memcpy (sval, prop+bytes_parsed, to_cpy);
 306               sval[to_cpy] = '\0';
 307             }
 308           bytes_parsed += vlen;
 309           bytes_parsed = PAD (bytes_parsed);
 310           break;
 311
 312         case 2: /* RGB value */
 313           /* No need to parse this */
 314           if (bytes_parsed+8 > bytes) return BadLength;
 315           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 316           break;
 317
 318         default: /* Parse Error */
 319           return BadValue;
 320         }
 321
 322       if (want_this)
 323         {
 324           ++settings_seen;
 325           if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 326             {
 327               settings->font = xstrdup (sval);
 328               settings->seen |= SEEN_FONT;
 329             }
 330           else if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 331             {
 332               settings->tb_style = xstrdup (sval);
 333               settings->seen |= SEEN_TB_STYLE;
 334             }
 335 #ifdef HAVE_XFT
 336           else if (strcmp (name, "Xft/Antialias") == 0)
 337             {
 338               settings->seen |= SEEN_AA;
 339               settings->aa = ival != 0;
 340             }
 341           else if (strcmp (name, "Xft/Hinting") == 0)
 342             {
 343               settings->seen |= SEEN_HINTING;
 344               settings->hinting = ival != 0;
 345             }
 346 # ifdef FC_HINT_STYLE
 347           else if (strcmp (name, "Xft/HintStyle") == 0)
 348             {
 349               settings->seen |= SEEN_HINTSTYLE;
 350               if (strcmp (sval, "hintnone") == 0)
 351                 settings->hintstyle = FC_HINT_NONE;
 352               else if (strcmp (sval, "hintslight") == 0)
 353                 settings->hintstyle = FC_HINT_SLIGHT;
 354               else if (strcmp (sval, "hintmedium") == 0)
 355                 settings->hintstyle = FC_HINT_MEDIUM;
 356               else if (strcmp (sval, "hintfull") == 0)
 357                 settings->hintstyle = FC_HINT_FULL;
 358               else
 359                 settings->seen &= ~SEEN_HINTSTYLE;
 360             }
 361 # endif
 362           else if (strcmp (name, "Xft/RGBA") == 0)
 363             {
 364               settings->seen |= SEEN_RGBA;
 365               if (strcmp (sval, "none") == 0)
 366                 settings->rgba = FC_RGBA_NONE;
 367               else if (strcmp (sval, "rgb") == 0)
 368                 settings->rgba = FC_RGBA_RGB;
 369               else if (strcmp (sval, "bgr") == 0)
 370                 settings->rgba = FC_RGBA_BGR;
 371               else if (strcmp (sval, "vrgb") == 0)
 372                 settings->rgba = FC_RGBA_VRGB;
 373               else if (strcmp (sval, "vbgr") == 0)
 374                 settings->rgba = FC_RGBA_VBGR;
 375               else
 376                 settings->seen &= ~SEEN_RGBA;
 377             }
 378           else if (strcmp (name, "Xft/DPI") == 0)
 379             {
 380               settings->seen |= SEEN_DPI;
 381               settings->dpi = (double)ival/1024.0;
 382             }
 383           else if (strcmp (name, "Xft/lcdfilter") == 0)
 384             {
 385               settings->seen |= SEEN_LCDFILTER;
 386               if (strcmp (sval, "none") == 0)
 387                 settings->lcdfilter = FC_LCD_NONE;
 388               else if (strcmp (sval, "lcddefault") == 0)
 389                 settings->lcdfilter = FC_LCD_DEFAULT;
 390               else
 391                 settings->seen &= ~SEEN_LCDFILTER;
 392             }
 393 #endif /* HAVE_XFT */
 394         }
 395     }
 396
 397   return settings_seen;
 398 }
 399
 400 static int
 401 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
 402 {
 403   Atom act_type;
 404   int act_form;
 405   unsigned long nitems, bytes_after;
 406   unsigned char *prop = NULL;
 407   Display *dpy = dpyinfo->display;
 408   int rc;
 409
 410   x_catch_errors (dpy);
 411   rc = XGetWindowProperty (dpy,
 412                            dpyinfo->xsettings_window,
 413                            dpyinfo->Xatom_xsettings_prop,
 414                            0, LONG_MAX, False, AnyPropertyType,
 415                            &act_type, &act_form, &nitems, &bytes_after,
 416                            &prop);
 417
 418   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 419       && act_type == dpyinfo->Xatom_xsettings_prop)
 420     rc = parse_settings (prop, nitems, settings);
 421
 422   XFree (prop);
 423
 424   x_uncatch_errors ();
 425
 426   return rc != 0;
 427 }
 428
 429
 430 static void
 431 apply_xft_settings (struct x_display_info *dpyinfo,
 432                     int send_event_p,
 433                     struct xsettings *settings)
 434 {
 435 #ifdef HAVE_XFT
 436   FcPattern *pat;
 437   struct xsettings oldsettings;
 438   int changed = 0;
 439
 440   memset (&oldsettings, 0, sizeof (oldsettings));
 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
 462   if ((settings->seen & SEEN_HINTING) != 0
 463       && oldsettings.hinting != settings->hinting)
 464     {
 465       FcPatternDel (pat, FC_HINTING);
 466       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 467       ++changed;
 468       oldsettings.hinting = settings->hinting;
 469     }
 470   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 471     {
 472       FcPatternDel (pat, FC_RGBA);
 473       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 474       oldsettings.rgba = settings->rgba;
 475       ++changed;
 476     }
 477
 478   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 479   if ((settings->seen & SEEN_LCDFILTER) != 0
 480       && oldsettings.lcdfilter != settings->lcdfilter)
 481     {
 482       FcPatternDel (pat, FC_LCD_FILTER);
 483       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 484       ++changed;
 485       oldsettings.lcdfilter = settings->lcdfilter;
 486     }
 487
 488 # ifdef FC_HINT_STYLE
 489   if ((settings->seen & SEEN_HINTSTYLE) != 0
 490       && oldsettings.hintstyle != settings->hintstyle)
 491     {
 492       FcPatternDel (pat, FC_HINT_STYLE);
 493       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 494       ++changed;
 495       oldsettings.hintstyle = settings->hintstyle;
 496     }
 497 # endif
 498
 499   if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
 500       && settings->dpi > 0)
 501     {
 502       Lisp_Object frame, tail;
 503
 504       FcPatternDel (pat, FC_DPI);
 505       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 506       ++changed;
 507       oldsettings.dpi = settings->dpi;
 508
 509       /* Change the DPI on this display and all frames on the display.  */
 510       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 511       FOR_EACH_FRAME (tail, frame)
 512         if (FRAME_X_P (XFRAME (frame))
 513             && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
 514           XFRAME (frame)->resy = XFRAME (frame)->resx = settings->dpi;
 515     }
 516
 517   if (changed)
 518     {
 519       static char const format[] =
 520         "Antialias: %d, Hinting: %d, RGBA: %d, LCDFilter: %d, "
 521         "Hintstyle: %d, DPI: %lf";
 522       enum
 523       {
 524         d_formats = 5,
 525         d_growth = INT_BUFSIZE_BOUND (int) - sizeof "%d",
 526         lf_formats = 1,
 527         max_f_integer_digits = DBL_MAX_10_EXP + 1,
 528         f_precision = 6,
 529         lf_growth = (sizeof "-." + max_f_integer_digits + f_precision
 530                      - sizeof "%lf")
 531       };
 532       char buf[sizeof format + d_formats * d_growth + lf_formats * lf_growth];
 533
 534       XftDefaultSet (dpyinfo->display, pat);
 535       if (send_event_p)
 536         store_config_changed_event (Qfont_render,
 537                                     XCAR (dpyinfo->name_list_element));
 538       sprintf (buf, format, oldsettings.aa, oldsettings.hinting,
 539                oldsettings.rgba, oldsettings.lcdfilter,
 540                oldsettings.hintstyle, oldsettings.dpi);
 541       Vxft_settings = build_string (buf);
 542     }
 543   else
 544     FcPatternDestroy (pat);
 545 #endif /* HAVE_XFT */
 546 }
 547
 548 static void
 549 read_and_apply_settings (struct x_display_info *dpyinfo, int send_event_p)
 550 {
 551   struct xsettings settings;
 552   Lisp_Object dpyname = XCAR (dpyinfo->name_list_element);
 553
 554   if (!read_settings (dpyinfo, &settings))
 555     return;
 556
 557   apply_xft_settings (dpyinfo, True, &settings);
 558   if (settings.seen & SEEN_TB_STYLE)
 559     {
 560       Lisp_Object style = Qnil;
 561       if (strcmp (settings.tb_style, "both") == 0)
 562         style = Qboth;
 563       else if (strcmp (settings.tb_style, "both-horiz") == 0)
 564         style = Qboth_horiz;
 565       else if (strcmp (settings.tb_style, "icons") == 0)
 566         style = Qimage;
 567       else if (strcmp (settings.tb_style, "text") == 0)
 568         style = Qtext;
 569       if (!NILP (style) && !EQ (style, current_tool_bar_style))
 570         {
 571           current_tool_bar_style = style;
 572           if (send_event_p)
 573             store_config_changed_event (Qtool_bar_style, dpyname);
 574         }
 575       xfree (settings.tb_style);
 576     }
 577
 578   if (settings.seen & SEEN_FONT)
 579     {
 580       if (!current_font || strcmp (current_font, settings.font) != 0)
 581         {
 582           xfree (current_font);
 583           current_font = settings.font;
 584           if (send_event_p)
 585             store_config_changed_event (Qfont_name, dpyname);
 586         }
 587       else
 588         xfree (settings.font);
 589     }
 590 }
 591
 592 void
 593 xft_settings_event (struct x_display_info *dpyinfo, XEvent *event)
 594 {
 595   int check_window_p = 0;
 596   int apply_settings = 0;
 597
 598   switch (event->type)
 599     {
 600     case DestroyNotify:
 601       if (dpyinfo->xsettings_window == event->xany.window)
 602         check_window_p = 1;
 603       break;
 604
 605     case ClientMessage:
 606       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 607           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 608           && event->xclient.window == dpyinfo->root_window)
 609         check_window_p = 1;
 610       break;
 611
 612     case PropertyNotify:
 613       if (event->xproperty.window == dpyinfo->xsettings_window
 614           && event->xproperty.state == PropertyNewValue
 615           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 616         apply_settings = 1;
 617       break;
 618     }
 619
 620
 621   if (check_window_p)
 622     {
 623       dpyinfo->xsettings_window = None;
 624       get_prop_window (dpyinfo);
 625       if (dpyinfo->xsettings_window != None)
 626         apply_settings = 1;
 627     }
 628
 629   if (apply_settings)
 630     read_and_apply_settings (dpyinfo, True);
 631 }
 632
 633
 634 static void
 635 init_gconf (void)
 636 {
 637 #if defined (HAVE_GCONF) && defined (HAVE_XFT)
 638   char *s;
 639
 640 #ifdef HAVE_G_TYPE_INIT
 641   g_type_init ();
 642 #endif
 643   gconf_client = gconf_client_get_default ();
 644   s = gconf_client_get_string (gconf_client, SYSTEM_MONO_FONT, NULL);
 645   if (s)
 646     {
 647       current_mono_font = xstrdup (s);
 648       g_free (s);
 649     }
 650   s = gconf_client_get_string (gconf_client, SYSTEM_FONT, NULL);
 651   if (s)
 652     {
 653       current_font = xstrdup (s);
 654       g_free (s);
 655     }
 656   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 657   gconf_client_add_dir (gconf_client,
 658                         SYSTEM_MONO_FONT,
 659                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 660                         NULL);
 661   gconf_client_notify_add (gconf_client,
 662                            SYSTEM_MONO_FONT,
 663                            something_changedCB,
 664                            NULL, NULL, NULL);
 665 #endif /* HAVE_GCONF && HAVE_XFT */
 666 }
 667
 668 static void
 669 init_xsettings (struct x_display_info *dpyinfo)
 670 {
 671   Display *dpy = dpyinfo->display;
 672
 673   BLOCK_INPUT;
 674
 675   /* Select events so we can detect client messages sent when selection
 676      owner changes.  */
 677   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 678
 679   get_prop_window (dpyinfo);
 680   if (dpyinfo->xsettings_window != None)
 681     read_and_apply_settings (dpyinfo, False);
 682
 683   UNBLOCK_INPUT;
 684 }
 685
 686 void
 687 xsettings_initialize (struct x_display_info *dpyinfo)
 688 {
 689   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 690   init_gconf ();
 691   init_xsettings (dpyinfo);
 692 }
 693
 694 const char *
 695 xsettings_get_system_font (void)
 696 {
 697   return current_mono_font;
 698 }
 699
 700 #ifdef USE_LUCID
 701 const char *
 702 xsettings_get_system_normal_font (void)
 703 {
 704   return current_font;
 705 }
 706 #endif
 707
 708 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 709        Sfont_get_system_normal_font,
 710        0, 0, 0,
 711        doc: /* Get the system default application font. */)
 712   (void)
 713 {
 714   return current_font
 715     ? make_string (current_font, strlen (current_font))
 716     : Qnil;
 717 }
 718
 719 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 720        0, 0, 0,
 721        doc: /* Get the system default fixed width font. */)
 722   (void)
 723 {
 724   return current_mono_font
 725     ? make_string (current_mono_font, strlen (current_mono_font))
 726     : Qnil;
 727 }
 728
 729 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
 730        Stool_bar_get_system_style, 0, 0, 0,
 731        doc: /* Get the system tool bar style.
 732 If no system tool bar style is known, return `tool-bar-style' if set to a
 733 known style.  Otherwise return image.  */)
 734   (void)
 735 {
 736   if (EQ (Vtool_bar_style, Qimage)
 737       || EQ (Vtool_bar_style, Qtext)
 738       || EQ (Vtool_bar_style, Qboth)
 739       || EQ (Vtool_bar_style, Qboth_horiz)
 740       || EQ (Vtool_bar_style, Qtext_image_horiz))
 741     return Vtool_bar_style;
 742   if (!NILP (current_tool_bar_style))
 743     return current_tool_bar_style;
 744   return Qimage;
 745 }
 746
 747 void
 748 syms_of_xsettings (void)
 749 {
 750   current_mono_font = NULL;
 751   current_font = NULL;
 752   first_dpyinfo = NULL;
 753 #ifdef HAVE_GCONF
 754   gconf_client = NULL;
 755 #endif
 756
 757   Qmonospace_font_name = intern_c_string ("monospace-font-name");
 758   staticpro (&Qmonospace_font_name);
 759   Qfont_name = intern_c_string ("font-name");
 760   staticpro (&Qfont_name);
 761   Qfont_render = intern_c_string ("font-render");
 762   staticpro (&Qfont_render);
 763   defsubr (&Sfont_get_system_font);
 764   defsubr (&Sfont_get_system_normal_font);
 765
 766   DEFVAR_BOOL ("font-use-system-font", use_system_font,
 767     doc: /* *Non-nil means to apply the system defined font dynamically.
 768 When this is non-nil and the system defined fixed width font changes, we
 769 update frames dynamically.
 770 If this variable is nil, Emacs ignores system font changes.  */);
 771   use_system_font = 0;
 772
 773   DEFVAR_LISP ("xft-settings", Vxft_settings,
 774                doc: /* Font settings applied to Xft.  */);
 775   Vxft_settings = make_string ("", 0);
 776
 777 #ifdef HAVE_XFT
 778   Fprovide (intern_c_string ("font-render-setting"), Qnil);
 779 #ifdef HAVE_GCONF
 780   Fprovide (intern_c_string ("system-font-setting"), Qnil);
 781 #endif
 782 #endif
 783
 784   current_tool_bar_style = Qnil;
 785   Qtool_bar_style = intern_c_string ("tool-bar-style");
 786   staticpro (&Qtool_bar_style);
 787   defsubr (&Stool_bar_get_system_style);
 788
 789   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
 790 }