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_GSETTINGS
  38 #include <glib-object.h>
  39 #include <gio/gio.h>
  40 #endif
  41
  42 #ifdef HAVE_GCONF
  43 #include <gconf/gconf-client.h>
  44 #endif
  45
  46 #ifdef HAVE_XFT
  47 #include <X11/Xft/Xft.h>
  48 #endif
  49
  50 static char *current_mono_font;
  51 static char *current_font;
  52 static struct x_display_info *first_dpyinfo;
  53 static Lisp_Object Qmonospace_font_name, Qfont_name, Qfont_render,
  54   Qtool_bar_style;
  55 static Lisp_Object current_tool_bar_style;
  56
  57 /* Store an config changed event in to the event queue.  */
  58
  59 static void
  60 store_config_changed_event (Lisp_Object arg, Lisp_Object display_name)
  61 {
  62   struct input_event event;
  63   EVENT_INIT (event);
  64   event.kind = CONFIG_CHANGED_EVENT;
  65   event.frame_or_window = display_name;
  66   event.arg = arg;
  67   kbd_buffer_store_event (&event);
  68 }
  69
  70 /* Return non-zero if DPYINFO is still valid.  */
  71 static int
  72 dpyinfo_valid (struct x_display_info *dpyinfo)
  73 {
  74   int found = 0;
  75   if (dpyinfo != NULL)
  76     {
  77       struct x_display_info *d;
  78       for (d = x_display_list; !found && d; d = d->next)
  79         found = d == dpyinfo && d->display == dpyinfo->display;
  80     }
  81   return found;
  82 }
  83
  84 /* Store a monospace font change event if the monospaced font changed.  */
  85
  86 #if defined HAVE_XFT && (defined HAVE_GSETTINGS || defined HAVE_GCONF)
  87 static void
  88 store_monospaced_changed (const char *newfont)
  89 {
  90   if (current_mono_font != NULL && strcmp (newfont, current_mono_font) == 0)
  91     return; /* No change. */
  92
  93   xfree (current_mono_font);
  94   current_mono_font = xstrdup (newfont);
  95
  96   if (dpyinfo_valid (first_dpyinfo) && use_system_font)
  97     {
  98       store_config_changed_event (Qmonospace_font_name,
  99                                   XCAR (first_dpyinfo->name_list_element));
 100     }
 101 }
 102 #endif
 103
 104 /* Store a font name change event if the font name changed.  */
 105
 106 #ifdef HAVE_XFT
 107 static void
 108 store_font_name_changed (const char *newfont)
 109 {
 110   if (current_font != NULL && strcmp (newfont, current_font) == 0)
 111     return; /* No change. */
 112
 113   xfree (current_font);
 114   current_font = xstrdup (newfont);
 115
 116   if (dpyinfo_valid (first_dpyinfo))
 117     {
 118       store_config_changed_event (Qfont_name,
 119                                   XCAR (first_dpyinfo->name_list_element));
 120     }
 121 }
 122 #endif /* HAVE_XFT */
 123
 124 /* Map TOOL_BAR_STYLE from a string to its corresponding Lisp value.
 125    Return Qnil if TOOL_BAR_STYLE is not known.  */
 126
 127 static Lisp_Object
 128 map_tool_bar_style (const char *tool_bar_style)
 129 {
 130   Lisp_Object style = Qnil;
 131   if (tool_bar_style)
 132     {
 133       if (strcmp (tool_bar_style, "both") == 0)
 134         style = Qboth;
 135       else if (strcmp (tool_bar_style, "both-horiz") == 0)
 136         style = Qboth_horiz;
 137       else if (strcmp (tool_bar_style, "icons") == 0)
 138         style = Qimage;
 139       else if (strcmp (tool_bar_style, "text") == 0)
 140         style = Qtext;
 141     }
 142
 143   return style;
 144 }
 145
 146 /* Store a tool bar style change event if the tool bar style changed.  */
 147
 148 static void
 149 store_tool_bar_style_changed (const char *newstyle,
 150                               struct x_display_info *dpyinfo)
 151 {
 152   Lisp_Object style = map_tool_bar_style (newstyle);
 153   if (EQ (current_tool_bar_style, style))
 154     return; /* No change. */
 155
 156   current_tool_bar_style = style;
 157   if (dpyinfo_valid (dpyinfo))
 158     store_config_changed_event (Qtool_bar_style,
 159                                 XCAR (dpyinfo->name_list_element));
 160 }
 161
 162
 163 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
 164 #define XSETTINGS_TOOL_BAR_STYLE  "Gtk/ToolbarStyle"
 165
 166 enum {
 167   SEEN_AA         = 0x01,
 168   SEEN_HINTING    = 0x02,
 169   SEEN_RGBA       = 0x04,
 170   SEEN_LCDFILTER  = 0x08,
 171   SEEN_HINTSTYLE  = 0x10,
 172   SEEN_DPI        = 0x20,
 173   SEEN_FONT       = 0x40,
 174   SEEN_TB_STYLE   = 0x80,
 175 };
 176 struct xsettings
 177 {
 178 #ifdef HAVE_XFT
 179   FcBool aa, hinting;
 180   int rgba, lcdfilter, hintstyle;
 181   double dpi;
 182
 183   char *font;
 184 #endif
 185
 186   char *tb_style;
 187
 188   unsigned seen;
 189 };
 190
 191 #ifdef HAVE_GSETTINGS
 192 #define GSETTINGS_SCHEMA         "org.gnome.desktop.interface"
 193 #define GSETTINGS_TOOL_BAR_STYLE "toolbar-style"
 194
 195 #ifdef HAVE_XFT
 196 #define GSETTINGS_MONO_FONT  "monospace-font-name"
 197 #define GSETTINGS_FONT_NAME  "font-name"
 198 #endif
 199
 200
 201 /* The single GSettings instance, or NULL if not connected to GSettings.  */
 202
 203 static GSettings *gsettings_client;
 204
 205 /* Callback called when something changed in GSettings.  */
 206
 207 static void
 208 something_changed_gsettingsCB (GSettings *settings,
 209                                gchar *key,
 210                                gpointer user_data)
 211 {
 212   GVariant *val;
 213
 214   if (strcmp (key, GSETTINGS_TOOL_BAR_STYLE) == 0)
 215     {
 216       val = g_settings_get_value (settings, GSETTINGS_TOOL_BAR_STYLE);
 217       if (val)
 218         {
 219           g_variant_ref_sink (val);
 220           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 221             {
 222               const gchar *newstyle = g_variant_get_string (val, NULL);
 223               store_tool_bar_style_changed (newstyle, first_dpyinfo);
 224             }
 225           g_variant_unref (val);
 226         }
 227     }
 228 #ifdef HAVE_XFT
 229   else if (strcmp (key, GSETTINGS_MONO_FONT) == 0)
 230     {
 231       val = g_settings_get_value (settings, GSETTINGS_MONO_FONT);
 232       if (val)
 233         {
 234           g_variant_ref_sink (val);
 235           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 236             {
 237               const gchar *newfont = g_variant_get_string (val, NULL);
 238               store_monospaced_changed (newfont);
 239             }
 240           g_variant_unref (val);
 241         }
 242     }
 243   else if (strcmp (key, GSETTINGS_FONT_NAME) == 0)
 244     {
 245       val = g_settings_get_value (settings, GSETTINGS_FONT_NAME);
 246       if (val)
 247         {
 248           g_variant_ref_sink (val);
 249           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 250             {
 251               const gchar *newfont = g_variant_get_string (val, NULL);
 252               store_font_name_changed (newfont);
 253             }
 254           g_variant_unref (val);
 255         }
 256     }
 257 #endif /* HAVE_XFT */
 258 }
 259
 260 #endif /* HAVE_GSETTINGS */
 261
 262 #ifdef HAVE_GCONF
 263 #define GCONF_TOOL_BAR_STYLE "/desktop/gnome/interface/toolbar_style"
 264 #ifdef HAVE_XFT
 265 #define GCONF_MONO_FONT  "/desktop/gnome/interface/monospace_font_name"
 266 #define GCONF_FONT_NAME  "/desktop/gnome/interface/font_name"
 267 #endif
 268
 269 /* The single GConf instance, or NULL if not connected to GConf.  */
 270
 271 static GConfClient *gconf_client;
 272
 273 /* Callback called when something changed in GConf that we care about.  */
 274
 275 static void
 276 something_changed_gconfCB (GConfClient *client,
 277                            guint cnxn_id,
 278                            GConfEntry *entry,
 279                            gpointer user_data)
 280 {
 281   GConfValue *v = gconf_entry_get_value (entry);
 282   const char *key = gconf_entry_get_key (entry);
 283
 284   if (!v || v->type != GCONF_VALUE_STRING || ! key) return;
 285   if (strcmp (key, GCONF_TOOL_BAR_STYLE) == 0)
 286     {
 287       const char *value = gconf_value_get_string (v);
 288       store_tool_bar_style_changed (value, first_dpyinfo);
 289     }
 290 #ifdef HAVE_XFT
 291   else if (strcmp (key, GCONF_MONO_FONT) == 0)
 292     {
 293       const char *value = gconf_value_get_string (v);
 294       store_monospaced_changed (value);
 295     }
 296   else if (strcmp (key, GCONF_FONT_NAME) == 0)
 297     {
 298       const char *value = gconf_value_get_string (v);
 299       store_font_name_changed (value);
 300     }
 301 #endif /* HAVE_XFT */
 302 }
 303
 304 #endif /* HAVE_GCONF */
 305
 306 #ifdef HAVE_XFT
 307
 308 /* Older fontconfig versions don't have FC_LCD_*.  */
 309 #ifndef FC_LCD_NONE
 310 #define FC_LCD_NONE 0
 311 #endif
 312 #ifndef FC_LCD_DEFAULT
 313 #define FC_LCD_DEFAULT 1
 314 #endif
 315 #ifndef FC_LCD_FILTER
 316 #define FC_LCD_FILTER "lcdfilter"
 317 #endif
 318
 319 #endif /* HAVE_XFT */
 320
 321 /* Find the window that contains the XSETTINGS property values.  */
 322
 323 static void
 324 get_prop_window (struct x_display_info *dpyinfo)
 325 {
 326   Display *dpy = dpyinfo->display;
 327
 328   XGrabServer (dpy);
 329   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 330                                                   dpyinfo->Xatom_xsettings_sel);
 331   if (dpyinfo->xsettings_window != None)
 332     /* Select events so we can detect if window is deleted or if settings
 333        are changed.  */
 334     XSelectInput (dpy, dpyinfo->xsettings_window,
 335                   PropertyChangeMask|StructureNotifyMask);
 336
 337   XUngrabServer (dpy);
 338 }
 339
 340 #define SWAP32(nr) (((nr) << 24) | (((nr) << 8) & 0xff0000)     \
 341                     | (((nr) >> 8) & 0xff00) | ((nr) >> 24))
 342 #define SWAP16(nr) (((nr) << 8) | ((nr) >> 8))
 343 #define PAD(nr)    (((nr) + 3) & ~3)
 344
 345 /* Parse xsettings and extract those that deal with Xft.
 346    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 347    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 348
 349    Layout of prop.  First is a header:
 350
 351    bytes   type     what
 352    ------------------------------------
 353    1      CARD8    byte-order
 354    3               unused
 355    4      CARD32   SERIAL
 356    4      CARD32   N_SETTINGS
 357
 358    Then N_SETTINGS records, with header:
 359
 360    bytes   type          what
 361    ------------------------------------
 362    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 363    1                    unused
 364    2      CARD16        n == name-length
 365    n      STRING8       name
 366    p                    unused, p=pad_to_even_4(n)
 367    4      CARD32        last-change-serial
 368
 369    and then the value, For string:
 370
 371    bytes   type          what
 372    ------------------------------------
 373    4      CARD32        n = value-length
 374    n      STRING8       value
 375    p                    unused, p=pad_to_even_4(n)
 376
 377    For integer:
 378
 379    bytes   type          what
 380    ------------------------------------
 381    4      INT32         value
 382
 383    For RGB color:
 384
 385    bytes   type          what
 386    ------------------------------------
 387    2      CARD16        red
 388    2      CARD16        blue
 389    2      CARD16        green
 390    2      CARD16        alpha
 391
 392    Returns non-zero if some Xft settings was seen, zero otherwise.
 393 */
 394
 395 static int
 396 parse_settings (unsigned char *prop,
 397                 long unsigned int bytes,
 398                 struct xsettings *settings)
 399 {
 400   Lisp_Object byteorder = Fbyteorder ();
 401   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 402   int that_bo = prop[0];
 403   CARD32 n_settings;
 404   int bytes_parsed = 0;
 405   int settings_seen = 0;
 406   int i = 0;
 407
 408   /* First 4 bytes is a serial number, skip that.  */
 409
 410   if (bytes < 12) return BadLength;
 411   memcpy (&n_settings, prop+8, 4);
 412   if (my_bo != that_bo) n_settings = SWAP32 (n_settings);
 413   bytes_parsed = 12;
 414
 415   memset (settings, 0, sizeof (*settings));
 416
 417   while (bytes_parsed+4 < bytes && settings_seen < 7
 418          && i < n_settings)
 419     {
 420       int type = prop[bytes_parsed++];
 421       CARD16 nlen;
 422       CARD32 vlen, ival = 0;
 423       char name[128]; /* The names we are looking for are not this long.  */
 424       char sval[128]; /* The values we are looking for are not this long.  */
 425       int want_this;
 426       int to_cpy;
 427
 428       sval[0] = '\0';
 429       ++i;
 430       ++bytes_parsed; /* Padding */
 431
 432       memcpy (&nlen, prop+bytes_parsed, 2);
 433       bytes_parsed += 2;
 434       if (my_bo != that_bo) nlen = SWAP16 (nlen);
 435       if (bytes_parsed+nlen > bytes) return BadLength;
 436       to_cpy = nlen > 127 ? 127 : nlen;
 437       memcpy (name, prop+bytes_parsed, to_cpy);
 438       name[to_cpy] = '\0';
 439
 440       bytes_parsed += nlen;
 441       bytes_parsed = PAD (bytes_parsed);
 442
 443       bytes_parsed += 4; /* Skip serial for this value */
 444       if (bytes_parsed > bytes) return BadLength;
 445
 446       want_this =
 447 #ifdef HAVE_XFT
 448         (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
 449         || strcmp (XSETTINGS_FONT_NAME, name) == 0
 450         ||
 451 #endif
 452         strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0;
 453
 454       switch (type)
 455         {
 456         case 0: /* Integer */
 457           if (bytes_parsed+4 > bytes) return BadLength;
 458           if (want_this)
 459             {
 460               memcpy (&ival, prop+bytes_parsed, 4);
 461               if (my_bo != that_bo) ival = SWAP32 (ival);
 462             }
 463           bytes_parsed += 4;
 464           break;
 465
 466         case 1: /* String */
 467           if (bytes_parsed+4 > bytes) return BadLength;
 468           memcpy (&vlen, prop+bytes_parsed, 4);
 469           bytes_parsed += 4;
 470           if (my_bo != that_bo) vlen = SWAP32 (vlen);
 471           if (want_this)
 472             {
 473               to_cpy = vlen > 127 ? 127 : vlen;
 474               memcpy (sval, prop+bytes_parsed, to_cpy);
 475               sval[to_cpy] = '\0';
 476             }
 477           bytes_parsed += vlen;
 478           bytes_parsed = PAD (bytes_parsed);
 479           break;
 480
 481         case 2: /* RGB value */
 482           /* No need to parse this */
 483           if (bytes_parsed+8 > bytes) return BadLength;
 484           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 485           break;
 486
 487         default: /* Parse Error */
 488           return BadValue;
 489         }
 490
 491       if (want_this)
 492         {
 493           ++settings_seen;
 494           if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 495             {
 496               settings->tb_style = xstrdup (sval);
 497               settings->seen |= SEEN_TB_STYLE;
 498             }
 499 #ifdef HAVE_XFT
 500           else if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 501             {
 502               settings->font = xstrdup (sval);
 503               settings->seen |= SEEN_FONT;
 504             }
 505           else if (strcmp (name, "Xft/Antialias") == 0)
 506             {
 507               settings->seen |= SEEN_AA;
 508               settings->aa = ival != 0;
 509             }
 510           else if (strcmp (name, "Xft/Hinting") == 0)
 511             {
 512               settings->seen |= SEEN_HINTING;
 513               settings->hinting = ival != 0;
 514             }
 515 # ifdef FC_HINT_STYLE
 516           else if (strcmp (name, "Xft/HintStyle") == 0)
 517             {
 518               settings->seen |= SEEN_HINTSTYLE;
 519               if (strcmp (sval, "hintnone") == 0)
 520                 settings->hintstyle = FC_HINT_NONE;
 521               else if (strcmp (sval, "hintslight") == 0)
 522                 settings->hintstyle = FC_HINT_SLIGHT;
 523               else if (strcmp (sval, "hintmedium") == 0)
 524                 settings->hintstyle = FC_HINT_MEDIUM;
 525               else if (strcmp (sval, "hintfull") == 0)
 526                 settings->hintstyle = FC_HINT_FULL;
 527               else
 528                 settings->seen &= ~SEEN_HINTSTYLE;
 529             }
 530 # endif
 531           else if (strcmp (name, "Xft/RGBA") == 0)
 532             {
 533               settings->seen |= SEEN_RGBA;
 534               if (strcmp (sval, "none") == 0)
 535                 settings->rgba = FC_RGBA_NONE;
 536               else if (strcmp (sval, "rgb") == 0)
 537                 settings->rgba = FC_RGBA_RGB;
 538               else if (strcmp (sval, "bgr") == 0)
 539                 settings->rgba = FC_RGBA_BGR;
 540               else if (strcmp (sval, "vrgb") == 0)
 541                 settings->rgba = FC_RGBA_VRGB;
 542               else if (strcmp (sval, "vbgr") == 0)
 543                 settings->rgba = FC_RGBA_VBGR;
 544               else
 545                 settings->seen &= ~SEEN_RGBA;
 546             }
 547           else if (strcmp (name, "Xft/DPI") == 0)
 548             {
 549               settings->seen |= SEEN_DPI;
 550               settings->dpi = (double)ival/1024.0;
 551             }
 552           else if (strcmp (name, "Xft/lcdfilter") == 0)
 553             {
 554               settings->seen |= SEEN_LCDFILTER;
 555               if (strcmp (sval, "none") == 0)
 556                 settings->lcdfilter = FC_LCD_NONE;
 557               else if (strcmp (sval, "lcddefault") == 0)
 558                 settings->lcdfilter = FC_LCD_DEFAULT;
 559               else
 560                 settings->seen &= ~SEEN_LCDFILTER;
 561             }
 562 #endif /* HAVE_XFT */
 563         }
 564     }
 565
 566   return settings_seen;
 567 }
 568
 569 /* Read settings from the XSettings property window on display for DPYINFO.
 570    Store settings read in SETTINGS.
 571    Return non-zero if successful, zero if not.  */
 572
 573 static int
 574 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
 575 {
 576   Atom act_type;
 577   int act_form;
 578   unsigned long nitems, bytes_after;
 579   unsigned char *prop = NULL;
 580   Display *dpy = dpyinfo->display;
 581   int rc;
 582
 583   x_catch_errors (dpy);
 584   rc = XGetWindowProperty (dpy,
 585                            dpyinfo->xsettings_window,
 586                            dpyinfo->Xatom_xsettings_prop,
 587                            0, LONG_MAX, False, AnyPropertyType,
 588                            &act_type, &act_form, &nitems, &bytes_after,
 589                            &prop);
 590
 591   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 592       && act_type == dpyinfo->Xatom_xsettings_prop)
 593     rc = parse_settings (prop, nitems, settings);
 594
 595   XFree (prop);
 596
 597   x_uncatch_errors ();
 598
 599   return rc != 0;
 600 }
 601
 602 /* Apply Xft settings in SETTINGS to the Xft library.
 603    If SEND_EVENT_P is non-zero store a Lisp event that Xft settings changed.  */
 604
 605 static void
 606 apply_xft_settings (struct x_display_info *dpyinfo,
 607                     int send_event_p,
 608                     struct xsettings *settings)
 609 {
 610 #ifdef HAVE_XFT
 611   FcPattern *pat;
 612   struct xsettings oldsettings;
 613   int changed = 0;
 614
 615   memset (&oldsettings, 0, sizeof (oldsettings));
 616   pat = FcPatternCreate ();
 617   XftDefaultSubstitute (dpyinfo->display,
 618                         XScreenNumberOfScreen (dpyinfo->screen),
 619                         pat);
 620   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 621   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 622 #ifdef FC_HINT_STYLE
 623   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 624 #endif
 625   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 626   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 627   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 628
 629   if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
 630     {
 631       FcPatternDel (pat, FC_ANTIALIAS);
 632       FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
 633       ++changed;
 634       oldsettings.aa = settings->aa;
 635     }
 636
 637   if ((settings->seen & SEEN_HINTING) != 0
 638       && oldsettings.hinting != settings->hinting)
 639     {
 640       FcPatternDel (pat, FC_HINTING);
 641       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 642       ++changed;
 643       oldsettings.hinting = settings->hinting;
 644     }
 645   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 646     {
 647       FcPatternDel (pat, FC_RGBA);
 648       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 649       oldsettings.rgba = settings->rgba;
 650       ++changed;
 651     }
 652
 653   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 654   if ((settings->seen & SEEN_LCDFILTER) != 0
 655       && oldsettings.lcdfilter != settings->lcdfilter)
 656     {
 657       FcPatternDel (pat, FC_LCD_FILTER);
 658       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 659       ++changed;
 660       oldsettings.lcdfilter = settings->lcdfilter;
 661     }
 662
 663 #ifdef FC_HINT_STYLE
 664   if ((settings->seen & SEEN_HINTSTYLE) != 0
 665       && oldsettings.hintstyle != settings->hintstyle)
 666     {
 667       FcPatternDel (pat, FC_HINT_STYLE);
 668       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 669       ++changed;
 670       oldsettings.hintstyle = settings->hintstyle;
 671     }
 672 #endif
 673
 674   if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
 675       && settings->dpi > 0)
 676     {
 677       Lisp_Object frame, tail;
 678
 679       FcPatternDel (pat, FC_DPI);
 680       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 681       ++changed;
 682       oldsettings.dpi = settings->dpi;
 683
 684       /* Change the DPI on this display and all frames on the display.  */
 685       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 686       FOR_EACH_FRAME (tail, frame)
 687         if (FRAME_X_P (XFRAME (frame))
 688             && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
 689           XFRAME (frame)->resy = XFRAME (frame)->resx = settings->dpi;
 690     }
 691
 692   if (changed)
 693     {
 694       static char const format[] =
 695         "Antialias: %d, Hinting: %d, RGBA: %d, LCDFilter: %d, "
 696         "Hintstyle: %d, DPI: %lf";
 697       enum
 698       {
 699         d_formats = 5,
 700         d_growth = INT_BUFSIZE_BOUND (int) - sizeof "%d",
 701         lf_formats = 1,
 702         max_f_integer_digits = DBL_MAX_10_EXP + 1,
 703         f_precision = 6,
 704         lf_growth = (sizeof "-." + max_f_integer_digits + f_precision
 705                      - sizeof "%lf")
 706       };
 707       char buf[sizeof format + d_formats * d_growth + lf_formats * lf_growth];
 708
 709       XftDefaultSet (dpyinfo->display, pat);
 710       if (send_event_p)
 711         store_config_changed_event (Qfont_render,
 712                                     XCAR (dpyinfo->name_list_element));
 713       sprintf (buf, format, oldsettings.aa, oldsettings.hinting,
 714                oldsettings.rgba, oldsettings.lcdfilter,
 715                oldsettings.hintstyle, oldsettings.dpi);
 716       Vxft_settings = build_string (buf);
 717     }
 718   else
 719     FcPatternDestroy (pat);
 720 #endif /* HAVE_XFT */
 721 }
 722
 723 /* Read XSettings from the display for DPYINFO.
 724    If SEND_EVENT_P is non-zero store a Lisp event settings that changed.  */
 725
 726 static void
 727 read_and_apply_settings (struct x_display_info *dpyinfo, int send_event_p)
 728 {
 729   struct xsettings settings;
 730
 731   if (!read_settings (dpyinfo, &settings))
 732     return;
 733
 734   apply_xft_settings (dpyinfo, True, &settings);
 735   if (settings.seen & SEEN_TB_STYLE)
 736     {
 737       if (send_event_p)
 738         store_tool_bar_style_changed (settings.tb_style, dpyinfo);
 739       else
 740         current_tool_bar_style = map_tool_bar_style (settings.tb_style);
 741       xfree (settings.tb_style);
 742     }
 743 #ifdef HAVE_XFT
 744   if (settings.seen & SEEN_FONT)
 745     {
 746       if (send_event_p)
 747         store_font_name_changed (settings.font);
 748       else
 749         {
 750           xfree (current_font);
 751           current_font = xstrdup (settings.font);
 752         }
 753       xfree (settings.font);
 754     }
 755 #endif
 756 }
 757
 758 /* Check if EVENT for the display in DPYINFO is XSettings related.  */
 759
 760 void
 761 xft_settings_event (struct x_display_info *dpyinfo, XEvent *event)
 762 {
 763   int check_window_p = 0;
 764   int apply_settings = 0;
 765
 766   switch (event->type)
 767     {
 768     case DestroyNotify:
 769       if (dpyinfo->xsettings_window == event->xany.window)
 770         check_window_p = 1;
 771       break;
 772
 773     case ClientMessage:
 774       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 775           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 776           && event->xclient.window == dpyinfo->root_window)
 777         check_window_p = 1;
 778       break;
 779
 780     case PropertyNotify:
 781       if (event->xproperty.window == dpyinfo->xsettings_window
 782           && event->xproperty.state == PropertyNewValue
 783           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 784         apply_settings = 1;
 785       break;
 786     }
 787
 788
 789   if (check_window_p)
 790     {
 791       dpyinfo->xsettings_window = None;
 792       get_prop_window (dpyinfo);
 793       if (dpyinfo->xsettings_window != None)
 794         apply_settings = 1;
 795     }
 796
 797   if (apply_settings)
 798     read_and_apply_settings (dpyinfo, True);
 799 }
 800
 801 /* Initialize GSettings and read startup values.  */
 802
 803 static void
 804 init_gsettings (void)
 805 {
 806 #ifdef HAVE_GSETTINGS
 807   GVariant *val;
 808   const gchar *const *schemas;
 809   int schema_found = 0;
 810
 811 #ifdef HAVE_G_TYPE_INIT
 812   g_type_init ();
 813 #endif
 814
 815   schemas = g_settings_list_schemas ();
 816   if (schemas == NULL) return;
 817   while (! schema_found && *schemas != NULL)
 818     schema_found = strcmp (*schemas++, GSETTINGS_SCHEMA) == 0;
 819   if (!schema_found) return;
 820
 821   gsettings_client = g_settings_new (GSETTINGS_SCHEMA);
 822   if (!gsettings_client) return;
 823   g_object_ref_sink (G_OBJECT (gsettings_client));
 824   g_signal_connect (G_OBJECT (gsettings_client), "changed",
 825                     G_CALLBACK (something_changed_gsettingsCB), NULL);
 826
 827   val = g_settings_get_value (gsettings_client, GSETTINGS_TOOL_BAR_STYLE);
 828   if (val)
 829     {
 830       g_variant_ref_sink (val);
 831       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 832         current_tool_bar_style
 833           = map_tool_bar_style (g_variant_get_string (val, NULL));
 834       g_variant_unref (val);
 835     }
 836
 837 #ifdef HAVE_XFT
 838   val = g_settings_get_value (gsettings_client, GSETTINGS_MONO_FONT);
 839   if (val)
 840     {
 841       g_variant_ref_sink (val);
 842       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 843         current_mono_font = xstrdup (g_variant_get_string (val, NULL));
 844       g_variant_unref (val);
 845     }
 846
 847   val = g_settings_get_value (gsettings_client, GSETTINGS_FONT_NAME);
 848   if (val)
 849     {
 850       g_variant_ref_sink (val);
 851       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 852         current_font = xstrdup (g_variant_get_string (val, NULL));
 853       g_variant_unref (val);
 854     }
 855 #endif /* HAVE_XFT */
 856
 857 #endif /* HAVE_GSETTINGS */
 858 }
 859
 860 /* Init GConf and read startup values.  */
 861
 862 static void
 863 init_gconf (void)
 864 {
 865 #if defined (HAVE_GCONF)
 866   char *s;
 867
 868 #ifdef HAVE_G_TYPE_INIT
 869   g_type_init ();
 870 #endif
 871
 872   gconf_client = gconf_client_get_default ();
 873   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 874   gconf_client_add_dir (gconf_client,
 875                         GCONF_TOOL_BAR_STYLE,
 876                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 877                         NULL);
 878   gconf_client_notify_add (gconf_client,
 879                            GCONF_TOOL_BAR_STYLE,
 880                            something_changed_gconfCB,
 881                            NULL, NULL, NULL);
 882
 883   s = gconf_client_get_string (gconf_client, GCONF_TOOL_BAR_STYLE, NULL);
 884   if (s)
 885     {
 886       current_tool_bar_style = map_tool_bar_style (s);
 887       g_free (s);
 888     }
 889
 890 #ifdef HAVE_XFT
 891   s = gconf_client_get_string (gconf_client, GCONF_MONO_FONT, NULL);
 892   if (s)
 893     {
 894       current_mono_font = xstrdup (s);
 895       g_free (s);
 896     }
 897   s = gconf_client_get_string (gconf_client, GCONF_FONT_NAME, NULL);
 898   if (s)
 899     {
 900       current_font = xstrdup (s);
 901       g_free (s);
 902     }
 903   gconf_client_add_dir (gconf_client,
 904                         GCONF_MONO_FONT,
 905                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 906                         NULL);
 907   gconf_client_notify_add (gconf_client,
 908                            GCONF_MONO_FONT,
 909                            something_changed_gconfCB,
 910                            NULL, NULL, NULL);
 911   gconf_client_add_dir (gconf_client,
 912                         GCONF_FONT_NAME,
 913                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 914                         NULL);
 915   gconf_client_notify_add (gconf_client,
 916                            GCONF_FONT_NAME,
 917                            something_changed_gconfCB,
 918                            NULL, NULL, NULL);
 919 #endif /* HAVE_XFT */
 920 #endif /* HAVE_GCONF */
 921 }
 922
 923 /* Init Xsettings and read startup values.  */
 924
 925 static void
 926 init_xsettings (struct x_display_info *dpyinfo)
 927 {
 928   Display *dpy = dpyinfo->display;
 929
 930   BLOCK_INPUT;
 931
 932   /* Select events so we can detect client messages sent when selection
 933      owner changes.  */
 934   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 935
 936   get_prop_window (dpyinfo);
 937   if (dpyinfo->xsettings_window != None)
 938     read_and_apply_settings (dpyinfo, False);
 939
 940   UNBLOCK_INPUT;
 941 }
 942
 943 void
 944 xsettings_initialize (struct x_display_info *dpyinfo)
 945 {
 946   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 947   init_gconf ();
 948   init_xsettings (dpyinfo);
 949   init_gsettings ();
 950 }
 951
 952 /* Return the system monospaced font.
 953    May be NULL if not known.  */
 954
 955 const char *
 956 xsettings_get_system_font (void)
 957 {
 958   return current_mono_font;
 959 }
 960
 961 #ifdef USE_LUCID
 962 /* Return the system font.
 963    May be NULL if not known.  */
 964
 965 const char *
 966 xsettings_get_system_normal_font (void)
 967 {
 968   return current_font;
 969 }
 970 #endif
 971
 972 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 973        Sfont_get_system_normal_font,
 974        0, 0, 0,
 975        doc: /* Get the system default application font. */)
 976   (void)
 977 {
 978   return current_font ? build_string (current_font) : Qnil;
 979 }
 980
 981 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 982        0, 0, 0,
 983        doc: /* Get the system default fixed width font. */)
 984   (void)
 985 {
 986   return current_mono_font ? build_string (current_mono_font) : Qnil;
 987 }
 988
 989 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
 990        Stool_bar_get_system_style, 0, 0, 0,
 991        doc: /* Get the system tool bar style.
 992 If no system tool bar style is known, return `tool-bar-style' if set to a
 993 known style.  Otherwise return image.  */)
 994   (void)
 995 {
 996   if (EQ (Vtool_bar_style, Qimage)
 997       || EQ (Vtool_bar_style, Qtext)
 998       || EQ (Vtool_bar_style, Qboth)
 999       || EQ (Vtool_bar_style, Qboth_horiz)
1000       || EQ (Vtool_bar_style, Qtext_image_horiz))
1001     return Vtool_bar_style;
1002   if (!NILP (current_tool_bar_style))
1003     return current_tool_bar_style;
1004   return Qimage;
1005 }
1006
1007 void
1008 syms_of_xsettings (void)
1009 {
1010   current_mono_font = NULL;
1011   current_font = NULL;
1012   first_dpyinfo = NULL;
1013 #ifdef HAVE_GSETTINGS
1014   gsettings_client = NULL;
1015 #endif
1016 #ifdef HAVE_GCONF
1017   gconf_client = NULL;
1018 #endif
1019
1020   DEFSYM (Qmonospace_font_name, "monospace-font-name");
1021   DEFSYM (Qfont_name, "font-name");
1022   DEFSYM (Qfont_render, "font-render");
1023   defsubr (&Sfont_get_system_font);
1024   defsubr (&Sfont_get_system_normal_font);
1025
1026   DEFVAR_BOOL ("font-use-system-font", use_system_font,
1027     doc: /* *Non-nil means to apply the system defined font dynamically.
1028 When this is non-nil and the system defined fixed width font changes, we
1029 update frames dynamically.
1030 If this variable is nil, Emacs ignores system font changes.  */);
1031   use_system_font = 0;
1032
1033   DEFVAR_LISP ("xft-settings", Vxft_settings,
1034                doc: /* Font settings applied to Xft.  */);
1035   Vxft_settings = make_string ("", 0);
1036
1037 #ifdef HAVE_XFT
1038   Fprovide (intern_c_string ("font-render-setting"), Qnil);
1039 #if defined (HAVE_GCONF) || defined (HAVE_GSETTINGS)
1040   Fprovide (intern_c_string ("system-font-setting"), Qnil);
1041 #endif
1042 #endif
1043
1044   current_tool_bar_style = Qnil;
1045   DEFSYM (Qtool_bar_style, "tool-bar-style");
1046   defsubr (&Stool_bar_get_system_style);
1047
1048   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
1049 }