src/xsettings.c

   1 /* Functions for handle font and other 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 <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 int use_system_font;
  48 static Lisp_Object Vxft_settings;
  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, guint cnxn_id, GConfEntry *entry, gpointer user_data)
 104 {
 105   GConfValue *v = gconf_entry_get_value (entry);
 106
 107   if (!v) return;
 108   if (v->type == GCONF_VALUE_STRING)
 109     {
 110       const char *value = gconf_value_get_string (v);
 111       int i;
 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, long unsigned int bytes, struct xsettings *settings)
 226 {
 227   Lisp_Object byteorder = Fbyteorder ();
 228   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 229   int that_bo = prop[0];
 230   CARD32 n_settings;
 231   int bytes_parsed = 0;
 232   int settings_seen = 0;
 233   int i = 0;
 234
 235   /* First 4 bytes is a serial number, skip that.  */
 236
 237   if (bytes < 12) return BadLength;
 238   memcpy (&n_settings, prop+8, 4);
 239   if (my_bo != that_bo) n_settings = SWAP32 (n_settings);
 240   bytes_parsed = 12;
 241
 242   memset (settings, 0, sizeof (*settings));
 243
 244   while (bytes_parsed+4 < bytes && settings_seen < 7
 245          && i < n_settings)
 246     {
 247       int type = prop[bytes_parsed++];
 248       CARD16 nlen;
 249       CARD32 vlen, ival = 0;
 250       char name[128]; /* The names we are looking for are not this long.  */
 251       char sval[128]; /* The values we are looking for are not this long.  */
 252       int want_this;
 253       int to_cpy;
 254
 255       sval[0] = '\0';
 256       ++i;
 257       ++bytes_parsed; /* Padding */
 258
 259       memcpy (&nlen, prop+bytes_parsed, 2);
 260       bytes_parsed += 2;
 261       if (my_bo != that_bo) nlen = SWAP16 (nlen);
 262       if (bytes_parsed+nlen > bytes) return BadLength;
 263       to_cpy = nlen > 127 ? 127 : nlen;
 264       memcpy (name, prop+bytes_parsed, to_cpy);
 265       name[to_cpy] = '\0';
 266
 267       bytes_parsed += nlen;
 268       bytes_parsed = PAD (bytes_parsed);
 269
 270       bytes_parsed += 4; /* Skip serial for this value */
 271       if (bytes_parsed > bytes) return BadLength;
 272
 273       want_this =
 274 #ifdef HAVE_XFT
 275         (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
 276         ||
 277 #endif
 278         (strcmp (XSETTINGS_FONT_NAME, name) == 0)
 279         || (strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0);
 280
 281       switch (type)
 282         {
 283         case 0: /* Integer */
 284           if (bytes_parsed+4 > bytes) return BadLength;
 285           if (want_this)
 286             {
 287               memcpy (&ival, prop+bytes_parsed, 4);
 288               if (my_bo != that_bo) ival = SWAP32 (ival);
 289             }
 290           bytes_parsed += 4;
 291           break;
 292
 293         case 1: /* String */
 294           if (bytes_parsed+4 > bytes) return BadLength;
 295           memcpy (&vlen, prop+bytes_parsed, 4);
 296           bytes_parsed += 4;
 297           if (my_bo != that_bo) vlen = SWAP32 (vlen);
 298           if (want_this)
 299             {
 300               to_cpy = vlen > 127 ? 127 : vlen;
 301               memcpy (sval, prop+bytes_parsed, to_cpy);
 302               sval[to_cpy] = '\0';
 303             }
 304           bytes_parsed += vlen;
 305           bytes_parsed = PAD (bytes_parsed);
 306           break;
 307
 308         case 2: /* RGB value */
 309           /* No need to parse this */
 310           if (bytes_parsed+8 > bytes) return BadLength;
 311           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 312           break;
 313
 314         default: /* Parse Error */
 315           return BadValue;
 316         }
 317
 318       if (want_this)
 319         {
 320           ++settings_seen;
 321           if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 322             {
 323               settings->font = xstrdup (sval);
 324               settings->seen |= SEEN_FONT;
 325             }
 326           else if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 327             {
 328               settings->tb_style = xstrdup (sval);
 329               settings->seen |= SEEN_TB_STYLE;
 330             }
 331 #ifdef HAVE_XFT
 332           else if (strcmp (name, "Xft/Antialias") == 0)
 333             {
 334               settings->seen |= SEEN_AA;
 335               settings->aa = ival != 0;
 336             }
 337           else if (strcmp (name, "Xft/Hinting") == 0)
 338             {
 339               settings->seen |= SEEN_HINTING;
 340               settings->hinting = ival != 0;
 341             }
 342           else if (strcmp (name, "Xft/HintStyle") == 0)
 343             {
 344               settings->seen |= SEEN_HINTSTYLE;
 345               if (strcmp (sval, "hintnone") == 0)
 346                 settings->hintstyle = FC_HINT_NONE;
 347               else if (strcmp (sval, "hintslight") == 0)
 348                 settings->hintstyle = FC_HINT_SLIGHT;
 349               else if (strcmp (sval, "hintmedium") == 0)
 350                 settings->hintstyle = FC_HINT_MEDIUM;
 351               else if (strcmp (sval, "hintfull") == 0)
 352                 settings->hintstyle = FC_HINT_FULL;
 353               else
 354                 settings->seen &= ~SEEN_HINTSTYLE;
 355             }
 356           else if (strcmp (name, "Xft/RGBA") == 0)
 357             {
 358               settings->seen |= SEEN_RGBA;
 359               if (strcmp (sval, "none") == 0)
 360                 settings->rgba = FC_RGBA_NONE;
 361               else if (strcmp (sval, "rgb") == 0)
 362                 settings->rgba = FC_RGBA_RGB;
 363               else if (strcmp (sval, "bgr") == 0)
 364                 settings->rgba = FC_RGBA_BGR;
 365               else if (strcmp (sval, "vrgb") == 0)
 366                 settings->rgba = FC_RGBA_VRGB;
 367               else if (strcmp (sval, "vbgr") == 0)
 368                 settings->rgba = FC_RGBA_VBGR;
 369               else
 370                 settings->seen &= ~SEEN_RGBA;
 371             }
 372           else if (strcmp (name, "Xft/DPI") == 0)
 373             {
 374               settings->seen |= SEEN_DPI;
 375               settings->dpi = (double)ival/1024.0;
 376             }
 377           else if (strcmp (name, "Xft/lcdfilter") == 0)
 378             {
 379               settings->seen |= SEEN_LCDFILTER;
 380               if (strcmp (sval, "none") == 0)
 381                 settings->lcdfilter = FC_LCD_NONE;
 382               else if (strcmp (sval, "lcddefault") == 0)
 383                 settings->lcdfilter = FC_LCD_DEFAULT;
 384               else
 385                 settings->seen &= ~SEEN_LCDFILTER;
 386             }
 387 #endif /* HAVE_XFT */
 388         }
 389     }
 390
 391   return settings_seen;
 392 }
 393
 394 static int
 395 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
 396 {
 397   long long_len;
 398   Atom act_type;
 399   int act_form;
 400   unsigned long nitems, bytes_after;
 401   unsigned char *prop = NULL;
 402   Display *dpy = dpyinfo->display;
 403   int rc;
 404
 405   x_catch_errors (dpy);
 406   rc = XGetWindowProperty (dpy,
 407                            dpyinfo->xsettings_window,
 408                            dpyinfo->Xatom_xsettings_prop,
 409                            0, LONG_MAX, False, AnyPropertyType,
 410                            &act_type, &act_form, &nitems, &bytes_after,
 411                            &prop);
 412
 413   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 414       && act_type == dpyinfo->Xatom_xsettings_prop)
 415     rc = parse_settings (prop, nitems, settings);
 416
 417   XFree (prop);
 418
 419   x_uncatch_errors ();
 420
 421   return rc != 0;
 422 }
 423
 424
 425 static void
 426 apply_xft_settings (struct x_display_info *dpyinfo, int send_event_p, struct xsettings *settings)
 427 {
 428 #ifdef HAVE_XFT
 429   FcPattern *pat;
 430   struct xsettings oldsettings;
 431   int changed = 0;
 432   char buf[256];
 433
 434   memset (&oldsettings, 0, sizeof (oldsettings));
 435   buf[0] = '\0';
 436   pat = FcPatternCreate ();
 437   XftDefaultSubstitute (dpyinfo->display,
 438                         XScreenNumberOfScreen (dpyinfo->screen),
 439                         pat);
 440   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 441   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 442   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 443   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 444   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 445   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 446
 447   if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
 448     {
 449       FcPatternDel (pat, FC_ANTIALIAS);
 450       FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
 451       ++changed;
 452       oldsettings.aa = settings->aa;
 453     }
 454   sprintf (buf, "Antialias: %d", oldsettings.aa);
 455
 456   if ((settings->seen & SEEN_HINTING) != 0
 457       && oldsettings.hinting != settings->hinting)
 458     {
 459       FcPatternDel (pat, FC_HINTING);
 460       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 461       ++changed;
 462       oldsettings.hinting = settings->hinting;
 463     }
 464   if (strlen (buf) > 0) strcat (buf, ", ");
 465   sprintf (buf+strlen (buf), "Hinting: %d", oldsettings.hinting);
 466   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 467     {
 468       FcPatternDel (pat, FC_RGBA);
 469       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 470       oldsettings.rgba = settings->rgba;
 471       ++changed;
 472     }
 473   if (strlen (buf) > 0) strcat (buf, ", ");
 474   sprintf (buf+strlen (buf), "RGBA: %d", oldsettings.rgba);
 475
 476   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 477   if ((settings->seen & SEEN_LCDFILTER) != 0
 478       && oldsettings.lcdfilter != settings->lcdfilter)
 479     {
 480       FcPatternDel (pat, FC_LCD_FILTER);
 481       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 482       ++changed;
 483       oldsettings.lcdfilter = settings->lcdfilter;
 484     }
 485   if (strlen (buf) > 0) strcat (buf, ", ");
 486   sprintf (buf+strlen (buf), "LCDFilter: %d", oldsettings.lcdfilter);
 487
 488   if ((settings->seen & SEEN_HINTSTYLE) != 0
 489       && oldsettings.hintstyle != settings->hintstyle)
 490     {
 491       FcPatternDel (pat, FC_HINT_STYLE);
 492       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 493       ++changed;
 494       oldsettings.hintstyle = settings->hintstyle;
 495     }
 496   if (strlen (buf) > 0) strcat (buf, ", ");
 497   sprintf (buf+strlen (buf), "Hintstyle: %d", oldsettings.hintstyle);
 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 (strlen (buf) > 0) strcat (buf, ", ");
 518   sprintf (buf+strlen (buf), "DPI: %lf", oldsettings.dpi);
 519
 520   if (changed)
 521     {
 522       XftDefaultSet (dpyinfo->display, pat);
 523       if (send_event_p)
 524         store_config_changed_event (Qfont_render,
 525                                     XCAR (dpyinfo->name_list_element));
 526       Vxft_settings = make_string (buf, strlen (buf));
 527     }
 528   else
 529     FcPatternDestroy (pat);
 530 #endif /* HAVE_XFT */
 531 }
 532
 533 static void
 534 read_and_apply_settings (struct x_display_info *dpyinfo, int send_event_p)
 535 {
 536   struct xsettings settings;
 537   Lisp_Object dpyname = XCAR (dpyinfo->name_list_element);
 538
 539   if (!read_settings (dpyinfo, &settings))
 540     return;
 541
 542   apply_xft_settings (dpyinfo, True, &settings);
 543   if (settings.seen & SEEN_TB_STYLE)
 544     {
 545       Lisp_Object style = Qnil;
 546       if (strcmp (settings.tb_style, "both") == 0)
 547         style = Qboth;
 548       else if (strcmp (settings.tb_style, "both-horiz") == 0)
 549         style = Qboth_horiz;
 550       else if (strcmp (settings.tb_style, "icons") == 0)
 551         style = Qimage;
 552       else if (strcmp (settings.tb_style, "text") == 0)
 553         style = Qtext;
 554       if (!NILP (style) && !EQ (style, current_tool_bar_style))
 555         {
 556           current_tool_bar_style = style;
 557           if (send_event_p)
 558             store_config_changed_event (Qtool_bar_style, dpyname);
 559         }
 560       free (settings.tb_style);
 561     }
 562
 563   if (settings.seen & SEEN_FONT)
 564     {
 565       if (!current_font || strcmp (current_font, settings.font) != 0)
 566         {
 567           free (current_font);
 568           current_font = settings.font;
 569           if (send_event_p)
 570             store_config_changed_event (Qfont_name, dpyname);
 571         }
 572       else
 573         free (settings.font);
 574     }
 575 }
 576
 577 void
 578 xft_settings_event (struct x_display_info *dpyinfo, XEvent *event)
 579 {
 580   int check_window_p = 0;
 581   int apply_settings = 0;
 582
 583   switch (event->type)
 584     {
 585     case DestroyNotify:
 586       if (dpyinfo->xsettings_window == event->xany.window)
 587         check_window_p = 1;
 588       break;
 589
 590     case ClientMessage:
 591       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 592           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 593           && event->xclient.window == dpyinfo->root_window)
 594         check_window_p = 1;
 595       break;
 596
 597     case PropertyNotify:
 598       if (event->xproperty.window == dpyinfo->xsettings_window
 599           && event->xproperty.state == PropertyNewValue
 600           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 601         apply_settings = 1;
 602       break;
 603     }
 604
 605
 606   if (check_window_p)
 607     {
 608       dpyinfo->xsettings_window = None;
 609       get_prop_window (dpyinfo);
 610       if (dpyinfo->xsettings_window != None)
 611         apply_settings = 1;
 612     }
 613
 614   if (apply_settings)
 615     read_and_apply_settings (dpyinfo, True);
 616 }
 617
 618
 619 static void
 620 init_gconf (void)
 621 {
 622 #if defined (HAVE_GCONF) && defined (HAVE_XFT)
 623   int i;
 624   char *s;
 625
 626   g_type_init ();
 627   gconf_client = gconf_client_get_default ();
 628   s = gconf_client_get_string (gconf_client, SYSTEM_MONO_FONT, NULL);
 629   if (s)
 630     {
 631       current_mono_font = xstrdup (s);
 632       g_free (s);
 633     }
 634   s = gconf_client_get_string (gconf_client, SYSTEM_FONT, NULL);
 635   if (s)
 636     {
 637       current_font = xstrdup (s);
 638       g_free (s);
 639     }
 640   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 641   gconf_client_add_dir (gconf_client,
 642                         SYSTEM_MONO_FONT,
 643                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 644                         NULL);
 645   gconf_client_notify_add (gconf_client,
 646                            SYSTEM_MONO_FONT,
 647                            something_changedCB,
 648                            NULL, NULL, NULL);
 649 #endif /* HAVE_GCONF && HAVE_XFT */
 650 }
 651
 652 static void
 653 init_xsettings (struct x_display_info *dpyinfo)
 654 {
 655   char sel[64];
 656   Display *dpy = dpyinfo->display;
 657
 658   BLOCK_INPUT;
 659
 660   sprintf (sel, "_XSETTINGS_S%d", XScreenNumberOfScreen (dpyinfo->screen));
 661   dpyinfo->Xatom_xsettings_sel = XInternAtom (dpy, sel, False);
 662   dpyinfo->Xatom_xsettings_prop = XInternAtom (dpy,
 663                                                "_XSETTINGS_SETTINGS",
 664                                                False);
 665   dpyinfo->Xatom_xsettings_mgr = XInternAtom (dpy, "MANAGER", False);
 666
 667   /* Select events so we can detect client messages sent when selection
 668      owner changes.  */
 669   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 670
 671   get_prop_window (dpyinfo);
 672   if (dpyinfo->xsettings_window != None)
 673     read_and_apply_settings (dpyinfo, False);
 674
 675   UNBLOCK_INPUT;
 676 }
 677
 678 void
 679 xsettings_initialize (struct x_display_info *dpyinfo)
 680 {
 681   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 682   init_gconf ();
 683   init_xsettings (dpyinfo);
 684 }
 685
 686 const char *
 687 xsettings_get_system_font (void)
 688 {
 689   return current_mono_font;
 690 }
 691
 692 const char *
 693 xsettings_get_system_normal_font (void)
 694 {
 695   return current_font;
 696 }
 697
 698 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 699        Sfont_get_system_normal_font,
 700        0, 0, 0,
 701        doc: /* Get the system default application font. */)
 702   ()
 703 {
 704   return current_font
 705     ? make_string (current_font, strlen (current_font))
 706     : Qnil;
 707 }
 708
 709 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 710        0, 0, 0,
 711        doc: /* Get the system default fixed width font. */)
 712   ()
 713 {
 714   return current_mono_font
 715     ? make_string (current_mono_font, strlen (current_mono_font))
 716     : Qnil;
 717 }
 718
 719 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style, Stool_bar_get_system_style,
 720        0, 0, 0,
 721        doc: /* Get the system tool bar style.
 722 If no system tool bar style is known, return `tool-bar-style' if set to a
 723 known style.  Otherwise return image.  */)
 724   ()
 725 {
 726   if (EQ (Vtool_bar_style, Qimage)
 727       || EQ (Vtool_bar_style, Qtext)
 728       || EQ (Vtool_bar_style, Qboth)
 729       || EQ (Vtool_bar_style, Qboth_horiz))
 730     return Vtool_bar_style;
 731   if (!NILP (current_tool_bar_style))
 732     return current_tool_bar_style;
 733   return Qimage;
 734 }
 735
 736 void
 737 syms_of_xsettings (void)
 738 {
 739   current_mono_font = NULL;
 740   current_font = NULL;
 741   first_dpyinfo = NULL;
 742 #ifdef HAVE_GCONF
 743   gconf_client = NULL;
 744 #endif
 745
 746   Qmonospace_font_name = intern_c_string ("monospace-font-name");
 747   staticpro (&Qmonospace_font_name);
 748   Qfont_name = intern_c_string ("font-name");
 749   staticpro (&Qfont_name);
 750   Qfont_render = intern_c_string ("font-render");
 751   staticpro (&Qfont_render);
 752   defsubr (&Sfont_get_system_font);
 753   defsubr (&Sfont_get_system_normal_font);
 754
 755   DEFVAR_BOOL ("font-use-system-font", &use_system_font,
 756     doc: /* *Non-nil means to apply the system defined font dynamically.
 757 When this is non-nil and the system defined fixed width font changes, we
 758 update frames dynamically.
 759 If this variable is nil, Emacs ignores system font changes.  */);
 760   use_system_font = 0;
 761
 762   DEFVAR_LISP ("xft-settings", &Vxft_settings,
 763                doc: /* Font settings applied to Xft.  */);
 764   Vxft_settings = make_string ("", 0);
 765
 766 #ifdef HAVE_XFT
 767   Fprovide (intern_c_string ("font-render-setting"), Qnil);
 768 #ifdef HAVE_GCONF
 769   Fprovide (intern_c_string ("system-font-setting"), Qnil);
 770 #endif
 771 #endif
 772
 773   current_tool_bar_style = Qnil;
 774   Qtool_bar_style = intern_c_string ("tool-bar-style");
 775   staticpro (&Qtool_bar_style);
 776   defsubr (&Stool_bar_get_system_style);
 777
 778   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
 779 }
 780
 781 /* arch-tag: 541716ed-2e6b-42e1-8212-3197e01ea61d
 782    (do not change this comment) */