src/xsettings.c

   1 /* Functions for handling font and other changes dynamically.
   2
   3 Copyright (C) 2009-2014 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 <fcntl.h>
  25
  26 #include <byteswap.h>
  27
  28 #include "lisp.h"
  29 #include "xterm.h"
  30 #include "xsettings.h"
  31 #include "frame.h"
  32 #include "keyboard.h"
  33 #include "blockinput.h"
  34 #include "termhooks.h"
  35
  36 #include <X11/Xproto.h>
  37
  38 #ifdef HAVE_GSETTINGS
  39 #include <glib-object.h>
  40 #include <gio/gio.h>
  41 #endif
  42
  43 #ifdef HAVE_GCONF
  44 #include <gconf/gconf-client.h>
  45 #endif
  46
  47 #ifdef HAVE_XFT
  48 #include <X11/Xft/Xft.h>
  49 #endif
  50
  51 static char *current_mono_font;
  52 static char *current_font;
  53 static struct x_display_info *first_dpyinfo;
  54 static Lisp_Object Qmonospace_font_name, Qfont_name, Qfont_render,
  55   Qtool_bar_style;
  56 static Lisp_Object current_tool_bar_style;
  57
  58 /* Store an config changed event in to the event queue.  */
  59
  60 static void
  61 store_config_changed_event (Lisp_Object arg, Lisp_Object display_name)
  62 {
  63   struct input_event event;
  64   EVENT_INIT (event);
  65   event.kind = CONFIG_CHANGED_EVENT;
  66   event.frame_or_window = display_name;
  67   event.arg = arg;
  68   kbd_buffer_store_event (&event);
  69 }
  70
  71 /* Return non-zero if DPYINFO is still valid.  */
  72 static int
  73 dpyinfo_valid (struct x_display_info *dpyinfo)
  74 {
  75   int found = 0;
  76   if (dpyinfo != NULL)
  77     {
  78       struct x_display_info *d;
  79       for (d = x_display_list; !found && d; d = d->next)
  80         found = d == dpyinfo && d->display == dpyinfo->display;
  81     }
  82   return found;
  83 }
  84
  85 /* Store a monospace font change event if the monospaced font changed.  */
  86
  87 #if defined HAVE_XFT && (defined HAVE_GSETTINGS || defined HAVE_GCONF)
  88 static void
  89 store_monospaced_changed (const char *newfont)
  90 {
  91   if (current_mono_font != NULL && strcmp (newfont, current_mono_font) == 0)
  92     return; /* No change. */
  93
  94   xfree (current_mono_font);
  95   current_mono_font = xstrdup (newfont);
  96
  97   if (dpyinfo_valid (first_dpyinfo) && use_system_font)
  98     {
  99       store_config_changed_event (Qmonospace_font_name,
 100                                   XCAR (first_dpyinfo->name_list_element));
 101     }
 102 }
 103 #endif
 104
 105 /* Store a font name change event if the font name changed.  */
 106
 107 #ifdef HAVE_XFT
 108 static void
 109 store_font_name_changed (const char *newfont)
 110 {
 111   if (current_font != NULL && strcmp (newfont, current_font) == 0)
 112     return; /* No change. */
 113
 114   xfree (current_font);
 115   current_font = xstrdup (newfont);
 116
 117   if (dpyinfo_valid (first_dpyinfo))
 118     {
 119       store_config_changed_event (Qfont_name,
 120                                   XCAR (first_dpyinfo->name_list_element));
 121     }
 122 }
 123 #endif /* HAVE_XFT */
 124
 125 /* Map TOOL_BAR_STYLE from a string to its corresponding Lisp value.
 126    Return Qnil if TOOL_BAR_STYLE is not known.  */
 127
 128 static Lisp_Object
 129 map_tool_bar_style (const char *tool_bar_style)
 130 {
 131   Lisp_Object style = Qnil;
 132   if (tool_bar_style)
 133     {
 134       if (strcmp (tool_bar_style, "both") == 0)
 135         style = Qboth;
 136       else if (strcmp (tool_bar_style, "both-horiz") == 0)
 137         style = Qboth_horiz;
 138       else if (strcmp (tool_bar_style, "icons") == 0)
 139         style = Qimage;
 140       else if (strcmp (tool_bar_style, "text") == 0)
 141         style = Qtext;
 142     }
 143
 144   return style;
 145 }
 146
 147 /* Store a tool bar style change event if the tool bar style changed.  */
 148
 149 static void
 150 store_tool_bar_style_changed (const char *newstyle,
 151                               struct x_display_info *dpyinfo)
 152 {
 153   Lisp_Object style = map_tool_bar_style (newstyle);
 154   if (EQ (current_tool_bar_style, style))
 155     return; /* No change. */
 156
 157   current_tool_bar_style = style;
 158   if (dpyinfo_valid (dpyinfo))
 159     store_config_changed_event (Qtool_bar_style,
 160                                 XCAR (dpyinfo->name_list_element));
 161 }
 162
 163 #ifdef HAVE_XFT
 164 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
 165 #endif
 166 #define XSETTINGS_TOOL_BAR_STYLE  "Gtk/ToolbarStyle"
 167
 168 enum {
 169   SEEN_AA         = 0x01,
 170   SEEN_HINTING    = 0x02,
 171   SEEN_RGBA       = 0x04,
 172   SEEN_LCDFILTER  = 0x08,
 173   SEEN_HINTSTYLE  = 0x10,
 174   SEEN_DPI        = 0x20,
 175   SEEN_FONT       = 0x40,
 176   SEEN_TB_STYLE   = 0x80
 177 };
 178 struct xsettings
 179 {
 180 #ifdef HAVE_XFT
 181   FcBool aa, hinting;
 182   int rgba, lcdfilter, hintstyle;
 183   double dpi;
 184
 185   char *font;
 186 #endif
 187
 188   char *tb_style;
 189
 190   unsigned seen;
 191 };
 192
 193 #ifdef HAVE_GSETTINGS
 194 #define GSETTINGS_SCHEMA         "org.gnome.desktop.interface"
 195 #define GSETTINGS_TOOL_BAR_STYLE "toolbar-style"
 196
 197 #ifdef HAVE_XFT
 198 #define GSETTINGS_MONO_FONT  "monospace-font-name"
 199 #define GSETTINGS_FONT_NAME  "font-name"
 200 #endif
 201
 202
 203 /* The single GSettings instance, or NULL if not connected to GSettings.  */
 204
 205 static GSettings *gsettings_client;
 206
 207 /* Callback called when something changed in GSettings.  */
 208
 209 static void
 210 something_changed_gsettingsCB (GSettings *settings,
 211                                gchar *key,
 212                                gpointer user_data)
 213 {
 214   GVariant *val;
 215
 216   if (strcmp (key, GSETTINGS_TOOL_BAR_STYLE) == 0)
 217     {
 218       val = g_settings_get_value (settings, GSETTINGS_TOOL_BAR_STYLE);
 219       if (val)
 220         {
 221           g_variant_ref_sink (val);
 222           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 223             {
 224               const gchar *newstyle = g_variant_get_string (val, NULL);
 225               store_tool_bar_style_changed (newstyle, first_dpyinfo);
 226             }
 227           g_variant_unref (val);
 228         }
 229     }
 230 #ifdef HAVE_XFT
 231   else if (strcmp (key, GSETTINGS_MONO_FONT) == 0)
 232     {
 233       val = g_settings_get_value (settings, GSETTINGS_MONO_FONT);
 234       if (val)
 235         {
 236           g_variant_ref_sink (val);
 237           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 238             {
 239               const gchar *newfont = g_variant_get_string (val, NULL);
 240               store_monospaced_changed (newfont);
 241             }
 242           g_variant_unref (val);
 243         }
 244     }
 245   else if (strcmp (key, GSETTINGS_FONT_NAME) == 0)
 246     {
 247       val = g_settings_get_value (settings, GSETTINGS_FONT_NAME);
 248       if (val)
 249         {
 250           g_variant_ref_sink (val);
 251           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 252             {
 253               const gchar *newfont = g_variant_get_string (val, NULL);
 254               store_font_name_changed (newfont);
 255             }
 256           g_variant_unref (val);
 257         }
 258     }
 259 #endif /* HAVE_XFT */
 260 }
 261
 262 #endif /* HAVE_GSETTINGS */
 263
 264 #ifdef HAVE_GCONF
 265 #define GCONF_TOOL_BAR_STYLE "/desktop/gnome/interface/toolbar_style"
 266 #ifdef HAVE_XFT
 267 #define GCONF_MONO_FONT  "/desktop/gnome/interface/monospace_font_name"
 268 #define GCONF_FONT_NAME  "/desktop/gnome/interface/font_name"
 269 #endif
 270
 271 /* The single GConf instance, or NULL if not connected to GConf.  */
 272
 273 static GConfClient *gconf_client;
 274
 275 /* Callback called when something changed in GConf that we care about.  */
 276
 277 static void
 278 something_changed_gconfCB (GConfClient *client,
 279                            guint cnxn_id,
 280                            GConfEntry *entry,
 281                            gpointer user_data)
 282 {
 283   GConfValue *v = gconf_entry_get_value (entry);
 284   const char *key = gconf_entry_get_key (entry);
 285
 286   if (!v || v->type != GCONF_VALUE_STRING || ! key) return;
 287   if (strcmp (key, GCONF_TOOL_BAR_STYLE) == 0)
 288     {
 289       const char *value = gconf_value_get_string (v);
 290       store_tool_bar_style_changed (value, first_dpyinfo);
 291     }
 292 #ifdef HAVE_XFT
 293   else if (strcmp (key, GCONF_MONO_FONT) == 0)
 294     {
 295       const char *value = gconf_value_get_string (v);
 296       store_monospaced_changed (value);
 297     }
 298   else if (strcmp (key, GCONF_FONT_NAME) == 0)
 299     {
 300       const char *value = gconf_value_get_string (v);
 301       store_font_name_changed (value);
 302     }
 303 #endif /* HAVE_XFT */
 304 }
 305
 306 #endif /* HAVE_GCONF */
 307
 308 #ifdef HAVE_XFT
 309
 310 /* Older fontconfig versions don't have FC_LCD_*.  */
 311 #ifndef FC_LCD_NONE
 312 #define FC_LCD_NONE 0
 313 #endif
 314 #ifndef FC_LCD_DEFAULT
 315 #define FC_LCD_DEFAULT 1
 316 #endif
 317 #ifndef FC_LCD_FILTER
 318 #define FC_LCD_FILTER "lcdfilter"
 319 #endif
 320
 321 #endif /* HAVE_XFT */
 322
 323 /* Find the window that contains the XSETTINGS property values.  */
 324
 325 static void
 326 get_prop_window (struct x_display_info *dpyinfo)
 327 {
 328   Display *dpy = dpyinfo->display;
 329
 330   XGrabServer (dpy);
 331   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 332                                                   dpyinfo->Xatom_xsettings_sel);
 333   if (dpyinfo->xsettings_window != None)
 334     /* Select events so we can detect if window is deleted or if settings
 335        are changed.  */
 336     XSelectInput (dpy, dpyinfo->xsettings_window,
 337                   PropertyChangeMask|StructureNotifyMask);
 338
 339   XUngrabServer (dpy);
 340 }
 341
 342 #define PAD(nr)    (((nr) + 3) & ~3)
 343
 344 /* Parse xsettings and extract those that deal with Xft.
 345    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 346    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 347
 348    Layout of prop.  First is a header:
 349
 350    bytes   type     what
 351    ------------------------------------
 352    1      CARD8    byte-order
 353    3               unused
 354    4      CARD32   SERIAL
 355    4      CARD32   N_SETTINGS
 356
 357    Then N_SETTINGS records, with header:
 358
 359    bytes   type          what
 360    ------------------------------------
 361    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 362    1                    unused
 363    2      CARD16        n == name-length
 364    n      STRING8       name
 365    p                    unused, p=pad_to_even_4(n)
 366    4      CARD32        last-change-serial
 367
 368    and then the value, For string:
 369
 370    bytes   type          what
 371    ------------------------------------
 372    4      CARD32        n = value-length
 373    n      STRING8       value
 374    p                    unused, p=pad_to_even_4(n)
 375
 376    For integer:
 377
 378    bytes   type          what
 379    ------------------------------------
 380    4      INT32         value
 381
 382    For RGB color:
 383
 384    bytes   type          what
 385    ------------------------------------
 386    2      CARD16        red
 387    2      CARD16        blue
 388    2      CARD16        green
 389    2      CARD16        alpha
 390
 391    Returns non-zero if some Xft settings was seen, zero otherwise.
 392 */
 393
 394 static int
 395 parse_settings (unsigned char *prop,
 396                 unsigned long bytes,
 397                 struct xsettings *settings)
 398 {
 399   Lisp_Object byteorder = Fbyteorder ();
 400   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 401   int that_bo = prop[0];
 402   CARD32 n_settings;
 403   int bytes_parsed = 0;
 404   int settings_seen = 0;
 405   int i = 0;
 406
 407   /* First 4 bytes is a serial number, skip that.  */
 408
 409   if (bytes < 12) return BadLength;
 410   memcpy (&n_settings, prop+8, 4);
 411   if (my_bo != that_bo) n_settings = bswap_32 (n_settings);
 412   bytes_parsed = 12;
 413
 414   memset (settings, 0, sizeof (*settings));
 415
 416   while (bytes_parsed+4 < bytes && settings_seen < 7
 417          && i < n_settings)
 418     {
 419       int type = prop[bytes_parsed++];
 420       CARD16 nlen;
 421       CARD32 vlen, ival = 0;
 422       char name[128]; /* The names we are looking for are not this long.  */
 423       char sval[128]; /* The values we are looking for are not this long.  */
 424       int want_this;
 425       int to_cpy;
 426
 427       sval[0] = '\0';
 428       ++i;
 429       ++bytes_parsed; /* Padding */
 430
 431       memcpy (&nlen, prop+bytes_parsed, 2);
 432       bytes_parsed += 2;
 433       if (my_bo != that_bo) nlen = bswap_16 (nlen);
 434       if (bytes_parsed+nlen > bytes) return BadLength;
 435       to_cpy = nlen > 127 ? 127 : nlen;
 436       memcpy (name, prop+bytes_parsed, to_cpy);
 437       name[to_cpy] = '\0';
 438
 439       bytes_parsed += nlen;
 440       bytes_parsed = PAD (bytes_parsed);
 441
 442       bytes_parsed += 4; /* Skip serial for this value */
 443       if (bytes_parsed > bytes) return BadLength;
 444
 445       want_this =
 446 #ifdef HAVE_XFT
 447         (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
 448         || strcmp (XSETTINGS_FONT_NAME, name) == 0
 449         ||
 450 #endif
 451         strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0;
 452
 453       switch (type)
 454         {
 455         case 0: /* Integer */
 456           if (bytes_parsed+4 > bytes) return BadLength;
 457           if (want_this)
 458             {
 459               memcpy (&ival, prop+bytes_parsed, 4);
 460               if (my_bo != that_bo) ival = bswap_32 (ival);
 461             }
 462           bytes_parsed += 4;
 463           break;
 464
 465         case 1: /* String */
 466           if (bytes_parsed+4 > bytes) return BadLength;
 467           memcpy (&vlen, prop+bytes_parsed, 4);
 468           bytes_parsed += 4;
 469           if (my_bo != that_bo) vlen = bswap_32 (vlen);
 470           if (want_this)
 471             {
 472               to_cpy = vlen > 127 ? 127 : vlen;
 473               memcpy (sval, prop+bytes_parsed, to_cpy);
 474               sval[to_cpy] = '\0';
 475             }
 476           bytes_parsed += vlen;
 477           bytes_parsed = PAD (bytes_parsed);
 478           break;
 479
 480         case 2: /* RGB value */
 481           /* No need to parse this */
 482           if (bytes_parsed+8 > bytes) return BadLength;
 483           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 484           break;
 485
 486         default: /* Parse Error */
 487           return BadValue;
 488         }
 489
 490       if (want_this)
 491         {
 492           ++settings_seen;
 493           if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 494             {
 495               settings->tb_style = xstrdup (sval);
 496               settings->seen |= SEEN_TB_STYLE;
 497             }
 498 #ifdef HAVE_XFT
 499           else if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 500             {
 501               settings->font = xstrdup (sval);
 502               settings->seen |= SEEN_FONT;
 503             }
 504           else if (strcmp (name, "Xft/Antialias") == 0)
 505             {
 506               settings->seen |= SEEN_AA;
 507               settings->aa = ival != 0;
 508             }
 509           else if (strcmp (name, "Xft/Hinting") == 0)
 510             {
 511               settings->seen |= SEEN_HINTING;
 512               settings->hinting = ival != 0;
 513             }
 514 # ifdef FC_HINT_STYLE
 515           else if (strcmp (name, "Xft/HintStyle") == 0)
 516             {
 517               settings->seen |= SEEN_HINTSTYLE;
 518               if (strcmp (sval, "hintnone") == 0)
 519                 settings->hintstyle = FC_HINT_NONE;
 520               else if (strcmp (sval, "hintslight") == 0)
 521                 settings->hintstyle = FC_HINT_SLIGHT;
 522               else if (strcmp (sval, "hintmedium") == 0)
 523                 settings->hintstyle = FC_HINT_MEDIUM;
 524               else if (strcmp (sval, "hintfull") == 0)
 525                 settings->hintstyle = FC_HINT_FULL;
 526               else
 527                 settings->seen &= ~SEEN_HINTSTYLE;
 528             }
 529 # endif
 530           else if (strcmp (name, "Xft/RGBA") == 0)
 531             {
 532               settings->seen |= SEEN_RGBA;
 533               if (strcmp (sval, "none") == 0)
 534                 settings->rgba = FC_RGBA_NONE;
 535               else if (strcmp (sval, "rgb") == 0)
 536                 settings->rgba = FC_RGBA_RGB;
 537               else if (strcmp (sval, "bgr") == 0)
 538                 settings->rgba = FC_RGBA_BGR;
 539               else if (strcmp (sval, "vrgb") == 0)
 540                 settings->rgba = FC_RGBA_VRGB;
 541               else if (strcmp (sval, "vbgr") == 0)
 542                 settings->rgba = FC_RGBA_VBGR;
 543               else
 544                 settings->seen &= ~SEEN_RGBA;
 545             }
 546           else if (strcmp (name, "Xft/DPI") == 0)
 547             {
 548               settings->seen |= SEEN_DPI;
 549               settings->dpi = (double)ival/1024.0;
 550             }
 551           else if (strcmp (name, "Xft/lcdfilter") == 0)
 552             {
 553               settings->seen |= SEEN_LCDFILTER;
 554               if (strcmp (sval, "none") == 0)
 555                 settings->lcdfilter = FC_LCD_NONE;
 556               else if (strcmp (sval, "lcddefault") == 0)
 557                 settings->lcdfilter = FC_LCD_DEFAULT;
 558               else
 559                 settings->seen &= ~SEEN_LCDFILTER;
 560             }
 561 #endif /* HAVE_XFT */
 562         }
 563     }
 564
 565   return settings_seen;
 566 }
 567
 568 /* Read settings from the XSettings property window on display for DPYINFO.
 569    Store settings read in SETTINGS.
 570    Return non-zero if successful, zero if not.  */
 571
 572 static int
 573 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
 574 {
 575   Atom act_type;
 576   int act_form;
 577   unsigned long nitems, bytes_after;
 578   unsigned char *prop = NULL;
 579   Display *dpy = dpyinfo->display;
 580   int rc;
 581
 582   x_catch_errors (dpy);
 583   rc = XGetWindowProperty (dpy,
 584                            dpyinfo->xsettings_window,
 585                            dpyinfo->Xatom_xsettings_prop,
 586                            0, LONG_MAX, False, AnyPropertyType,
 587                            &act_type, &act_form, &nitems, &bytes_after,
 588                            &prop);
 589
 590   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 591       && act_type == dpyinfo->Xatom_xsettings_prop)
 592     rc = parse_settings (prop, nitems, settings);
 593
 594   XFree (prop);
 595
 596   x_uncatch_errors ();
 597
 598   return rc != 0;
 599 }
 600
 601 /* Apply Xft settings in SETTINGS to the Xft library.
 602    If SEND_EVENT_P is non-zero store a Lisp event that Xft settings changed.  */
 603
 604 static void
 605 apply_xft_settings (struct x_display_info *dpyinfo,
 606                     int send_event_p,
 607                     struct xsettings *settings)
 608 {
 609 #ifdef HAVE_XFT
 610   FcPattern *pat;
 611   struct xsettings oldsettings;
 612   int changed = 0;
 613
 614   memset (&oldsettings, 0, sizeof (oldsettings));
 615   pat = FcPatternCreate ();
 616   XftDefaultSubstitute (dpyinfo->display,
 617                         XScreenNumberOfScreen (dpyinfo->screen),
 618                         pat);
 619   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 620   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 621 #ifdef FC_HINT_STYLE
 622   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 623 #endif
 624   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 625   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 626   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 627
 628   if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
 629     {
 630       FcPatternDel (pat, FC_ANTIALIAS);
 631       FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
 632       ++changed;
 633       oldsettings.aa = settings->aa;
 634     }
 635
 636   if ((settings->seen & SEEN_HINTING) != 0
 637       && oldsettings.hinting != settings->hinting)
 638     {
 639       FcPatternDel (pat, FC_HINTING);
 640       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 641       ++changed;
 642       oldsettings.hinting = settings->hinting;
 643     }
 644   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 645     {
 646       FcPatternDel (pat, FC_RGBA);
 647       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 648       oldsettings.rgba = settings->rgba;
 649       ++changed;
 650     }
 651
 652   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 653   if ((settings->seen & SEEN_LCDFILTER) != 0
 654       && oldsettings.lcdfilter != settings->lcdfilter)
 655     {
 656       FcPatternDel (pat, FC_LCD_FILTER);
 657       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 658       ++changed;
 659       oldsettings.lcdfilter = settings->lcdfilter;
 660     }
 661
 662 #ifdef FC_HINT_STYLE
 663   if ((settings->seen & SEEN_HINTSTYLE) != 0
 664       && oldsettings.hintstyle != settings->hintstyle)
 665     {
 666       FcPatternDel (pat, FC_HINT_STYLE);
 667       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 668       ++changed;
 669       oldsettings.hintstyle = settings->hintstyle;
 670     }
 671 #endif
 672
 673   if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
 674       && settings->dpi > 0)
 675     {
 676       FcPatternDel (pat, FC_DPI);
 677       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 678       ++changed;
 679       oldsettings.dpi = settings->dpi;
 680
 681       /* Changing the DPI on this display affects all frames on it.
 682          Check FRAME_RES_X and FRAME_RES_Y in frame.h to see how.  */
 683       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 684     }
 685
 686   if (changed)
 687     {
 688       static char const format[] =
 689         "Antialias: %d, Hinting: %d, RGBA: %d, LCDFilter: %d, "
 690         "Hintstyle: %d, DPI: %f";
 691       enum
 692       {
 693         d_formats = 5,
 694         d_growth = INT_BUFSIZE_BOUND (int) - sizeof "%d",
 695         lf_formats = 1,
 696         max_f_integer_digits = DBL_MAX_10_EXP + 1,
 697         f_precision = 6,
 698         lf_growth = (sizeof "-." + max_f_integer_digits + f_precision
 699                      - sizeof "%f")
 700       };
 701       char buf[sizeof format + d_formats * d_growth + lf_formats * lf_growth];
 702
 703       XftDefaultSet (dpyinfo->display, pat);
 704       if (send_event_p)
 705         store_config_changed_event (Qfont_render,
 706                                     XCAR (dpyinfo->name_list_element));
 707       Vxft_settings
 708         = make_formatted_string (buf, format,
 709                                  oldsettings.aa, oldsettings.hinting,
 710                                  oldsettings.rgba, oldsettings.lcdfilter,
 711                                  oldsettings.hintstyle, oldsettings.dpi);
 712
 713     }
 714   else
 715     FcPatternDestroy (pat);
 716 #endif /* HAVE_XFT */
 717 }
 718
 719 /* Read XSettings from the display for DPYINFO.
 720    If SEND_EVENT_P is non-zero store a Lisp event settings that changed.  */
 721
 722 static void
 723 read_and_apply_settings (struct x_display_info *dpyinfo, int send_event_p)
 724 {
 725   struct xsettings settings;
 726
 727   if (!read_settings (dpyinfo, &settings))
 728     return;
 729
 730   apply_xft_settings (dpyinfo, True, &settings);
 731   if (settings.seen & SEEN_TB_STYLE)
 732     {
 733       if (send_event_p)
 734         store_tool_bar_style_changed (settings.tb_style, dpyinfo);
 735       else
 736         current_tool_bar_style = map_tool_bar_style (settings.tb_style);
 737       xfree (settings.tb_style);
 738     }
 739 #ifdef HAVE_XFT
 740   if (settings.seen & SEEN_FONT)
 741     {
 742       if (send_event_p)
 743         store_font_name_changed (settings.font);
 744       else
 745         {
 746           xfree (current_font);
 747           current_font = xstrdup (settings.font);
 748         }
 749       xfree (settings.font);
 750     }
 751 #endif
 752 }
 753
 754 /* Check if EVENT for the display in DPYINFO is XSettings related.  */
 755
 756 void
 757 xft_settings_event (struct x_display_info *dpyinfo, const XEvent *event)
 758 {
 759   bool check_window_p = 0, apply_settings_p = 0;
 760
 761   switch (event->type)
 762     {
 763     case DestroyNotify:
 764       if (dpyinfo->xsettings_window == event->xany.window)
 765         check_window_p = 1;
 766       break;
 767
 768     case ClientMessage:
 769       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 770           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 771           && event->xclient.window == dpyinfo->root_window)
 772         check_window_p = 1;
 773       break;
 774
 775     case PropertyNotify:
 776       if (event->xproperty.window == dpyinfo->xsettings_window
 777           && event->xproperty.state == PropertyNewValue
 778           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 779         apply_settings_p = 1;
 780       break;
 781     }
 782
 783
 784   if (check_window_p)
 785     {
 786       dpyinfo->xsettings_window = None;
 787       get_prop_window (dpyinfo);
 788       if (dpyinfo->xsettings_window != None)
 789         apply_settings_p = 1;
 790     }
 791
 792   if (apply_settings_p)
 793     read_and_apply_settings (dpyinfo, True);
 794 }
 795
 796 /* Initialize GSettings and read startup values.  */
 797
 798 static void
 799 init_gsettings (void)
 800 {
 801 #ifdef HAVE_GSETTINGS
 802   GVariant *val;
 803   const gchar *const *schemas;
 804   int schema_found = 0;
 805
 806 #if ! GLIB_CHECK_VERSION (2, 36, 0)
 807   g_type_init ();
 808 #endif
 809
 810   schemas = g_settings_list_schemas ();
 811   if (schemas == NULL) return;
 812   while (! schema_found && *schemas != NULL)
 813     schema_found = strcmp (*schemas++, GSETTINGS_SCHEMA) == 0;
 814   if (!schema_found) return;
 815
 816   gsettings_client = g_settings_new (GSETTINGS_SCHEMA);
 817   if (!gsettings_client) return;
 818   g_object_ref_sink (G_OBJECT (gsettings_client));
 819   g_signal_connect (G_OBJECT (gsettings_client), "changed",
 820                     G_CALLBACK (something_changed_gsettingsCB), NULL);
 821
 822   val = g_settings_get_value (gsettings_client, GSETTINGS_TOOL_BAR_STYLE);
 823   if (val)
 824     {
 825       g_variant_ref_sink (val);
 826       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 827         current_tool_bar_style
 828           = map_tool_bar_style (g_variant_get_string (val, NULL));
 829       g_variant_unref (val);
 830     }
 831
 832 #ifdef HAVE_XFT
 833   val = g_settings_get_value (gsettings_client, GSETTINGS_MONO_FONT);
 834   if (val)
 835     {
 836       g_variant_ref_sink (val);
 837       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 838         current_mono_font = xstrdup (g_variant_get_string (val, NULL));
 839       g_variant_unref (val);
 840     }
 841
 842   val = g_settings_get_value (gsettings_client, GSETTINGS_FONT_NAME);
 843   if (val)
 844     {
 845       g_variant_ref_sink (val);
 846       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 847         current_font = xstrdup (g_variant_get_string (val, NULL));
 848       g_variant_unref (val);
 849     }
 850 #endif /* HAVE_XFT */
 851
 852 #endif /* HAVE_GSETTINGS */
 853 }
 854
 855 /* Init GConf and read startup values.  */
 856
 857 static void
 858 init_gconf (void)
 859 {
 860 #if defined (HAVE_GCONF)
 861   char *s;
 862
 863 #if ! GLIB_CHECK_VERSION (2, 36, 0)
 864   g_type_init ();
 865 #endif
 866
 867   gconf_client = gconf_client_get_default ();
 868   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 869   gconf_client_add_dir (gconf_client,
 870                         GCONF_TOOL_BAR_STYLE,
 871                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 872                         NULL);
 873   gconf_client_notify_add (gconf_client,
 874                            GCONF_TOOL_BAR_STYLE,
 875                            something_changed_gconfCB,
 876                            NULL, NULL, NULL);
 877
 878   s = gconf_client_get_string (gconf_client, GCONF_TOOL_BAR_STYLE, NULL);
 879   if (s)
 880     {
 881       current_tool_bar_style = map_tool_bar_style (s);
 882       g_free (s);
 883     }
 884
 885 #ifdef HAVE_XFT
 886   s = gconf_client_get_string (gconf_client, GCONF_MONO_FONT, NULL);
 887   if (s)
 888     {
 889       current_mono_font = xstrdup (s);
 890       g_free (s);
 891     }
 892   s = gconf_client_get_string (gconf_client, GCONF_FONT_NAME, NULL);
 893   if (s)
 894     {
 895       current_font = xstrdup (s);
 896       g_free (s);
 897     }
 898   gconf_client_add_dir (gconf_client,
 899                         GCONF_MONO_FONT,
 900                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 901                         NULL);
 902   gconf_client_notify_add (gconf_client,
 903                            GCONF_MONO_FONT,
 904                            something_changed_gconfCB,
 905                            NULL, NULL, NULL);
 906   gconf_client_add_dir (gconf_client,
 907                         GCONF_FONT_NAME,
 908                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 909                         NULL);
 910   gconf_client_notify_add (gconf_client,
 911                            GCONF_FONT_NAME,
 912                            something_changed_gconfCB,
 913                            NULL, NULL, NULL);
 914 #endif /* HAVE_XFT */
 915 #endif /* HAVE_GCONF */
 916 }
 917
 918 /* Init Xsettings and read startup values.  */
 919
 920 static void
 921 init_xsettings (struct x_display_info *dpyinfo)
 922 {
 923   Display *dpy = dpyinfo->display;
 924
 925   block_input ();
 926
 927   /* Select events so we can detect client messages sent when selection
 928      owner changes.  */
 929   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 930
 931   get_prop_window (dpyinfo);
 932   if (dpyinfo->xsettings_window != None)
 933     read_and_apply_settings (dpyinfo, False);
 934
 935   unblock_input ();
 936 }
 937
 938 void
 939 xsettings_initialize (struct x_display_info *dpyinfo)
 940 {
 941   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 942   init_gconf ();
 943   init_xsettings (dpyinfo);
 944   init_gsettings ();
 945 }
 946
 947 /* Return the system monospaced font.
 948    May be NULL if not known.  */
 949
 950 const char *
 951 xsettings_get_system_font (void)
 952 {
 953   return current_mono_font;
 954 }
 955
 956 #ifdef USE_LUCID
 957 /* Return the system font.
 958    May be NULL if not known.  */
 959
 960 const char *
 961 xsettings_get_system_normal_font (void)
 962 {
 963   return current_font;
 964 }
 965 #endif
 966
 967 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 968        Sfont_get_system_normal_font,
 969        0, 0, 0,
 970        doc: /* Get the system default application font. */)
 971   (void)
 972 {
 973   return current_font ? build_string (current_font) : Qnil;
 974 }
 975
 976 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 977        0, 0, 0,
 978        doc: /* Get the system default fixed width font. */)
 979   (void)
 980 {
 981   return current_mono_font ? build_string (current_mono_font) : Qnil;
 982 }
 983
 984 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
 985        Stool_bar_get_system_style, 0, 0, 0,
 986        doc: /* Get the system tool bar style.
 987 If no system tool bar style is known, return `tool-bar-style' if set to a
 988 known style.  Otherwise return image.  */)
 989   (void)
 990 {
 991   if (EQ (Vtool_bar_style, Qimage)
 992       || EQ (Vtool_bar_style, Qtext)
 993       || EQ (Vtool_bar_style, Qboth)
 994       || EQ (Vtool_bar_style, Qboth_horiz)
 995       || EQ (Vtool_bar_style, Qtext_image_horiz))
 996     return Vtool_bar_style;
 997   if (!NILP (current_tool_bar_style))
 998     return current_tool_bar_style;
 999   return Qimage;
1000 }
1001
1002 void
1003 syms_of_xsettings (void)
1004 {
1005   current_mono_font = NULL;
1006   current_font = NULL;
1007   first_dpyinfo = NULL;
1008 #ifdef HAVE_GSETTINGS
1009   gsettings_client = NULL;
1010 #endif
1011 #ifdef HAVE_GCONF
1012   gconf_client = NULL;
1013 #endif
1014
1015   DEFSYM (Qmonospace_font_name, "monospace-font-name");
1016   DEFSYM (Qfont_name, "font-name");
1017   DEFSYM (Qfont_render, "font-render");
1018   defsubr (&Sfont_get_system_font);
1019   defsubr (&Sfont_get_system_normal_font);
1020
1021   DEFVAR_BOOL ("font-use-system-font", use_system_font,
1022     doc: /* Non-nil means to apply the system defined font dynamically.
1023 When this is non-nil and the system defined fixed width font changes, we
1024 update frames dynamically.
1025 If this variable is nil, Emacs ignores system font changes.  */);
1026   use_system_font = 0;
1027
1028   DEFVAR_LISP ("xft-settings", Vxft_settings,
1029                doc: /* Font settings applied to Xft.  */);
1030   Vxft_settings = empty_unibyte_string;
1031
1032 #ifdef HAVE_XFT
1033   Fprovide (intern_c_string ("font-render-setting"), Qnil);
1034 #if defined (HAVE_GCONF) || defined (HAVE_GSETTINGS)
1035   Fprovide (intern_c_string ("system-font-setting"), Qnil);
1036 #endif
1037 #endif
1038
1039   current_tool_bar_style = Qnil;
1040   DEFSYM (Qtool_bar_style, "tool-bar-style");
1041   defsubr (&Stool_bar_get_system_style);
1042
1043   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
1044 }