src/xsettings.c

   1 /* Functions for handling font and other changes dynamically.
   2
   3 Copyright (C) 2009-2012  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 #ifdef HAVE_XFT
 163 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
 164 #endif
 165 #define XSETTINGS_TOOL_BAR_STYLE  "Gtk/ToolbarStyle"
 166
 167 enum {
 168   SEEN_AA         = 0x01,
 169   SEEN_HINTING    = 0x02,
 170   SEEN_RGBA       = 0x04,
 171   SEEN_LCDFILTER  = 0x08,
 172   SEEN_HINTSTYLE  = 0x10,
 173   SEEN_DPI        = 0x20,
 174   SEEN_FONT       = 0x40,
 175   SEEN_TB_STYLE   = 0x80,
 176 };
 177 struct xsettings
 178 {
 179 #ifdef HAVE_XFT
 180   FcBool aa, hinting;
 181   int rgba, lcdfilter, hintstyle;
 182   double dpi;
 183
 184   char *font;
 185 #endif
 186
 187   char *tb_style;
 188
 189   unsigned seen;
 190 };
 191
 192 #ifdef HAVE_GSETTINGS
 193 #define GSETTINGS_SCHEMA         "org.gnome.desktop.interface"
 194 #define GSETTINGS_TOOL_BAR_STYLE "toolbar-style"
 195
 196 #ifdef HAVE_XFT
 197 #define GSETTINGS_MONO_FONT  "monospace-font-name"
 198 #define GSETTINGS_FONT_NAME  "font-name"
 199 #endif
 200
 201
 202 /* The single GSettings instance, or NULL if not connected to GSettings.  */
 203
 204 static GSettings *gsettings_client;
 205
 206 /* Callback called when something changed in GSettings.  */
 207
 208 static void
 209 something_changed_gsettingsCB (GSettings *settings,
 210                                gchar *key,
 211                                gpointer user_data)
 212 {
 213   GVariant *val;
 214
 215   if (strcmp (key, GSETTINGS_TOOL_BAR_STYLE) == 0)
 216     {
 217       val = g_settings_get_value (settings, GSETTINGS_TOOL_BAR_STYLE);
 218       if (val)
 219         {
 220           g_variant_ref_sink (val);
 221           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 222             {
 223               const gchar *newstyle = g_variant_get_string (val, NULL);
 224               store_tool_bar_style_changed (newstyle, first_dpyinfo);
 225             }
 226           g_variant_unref (val);
 227         }
 228     }
 229 #ifdef HAVE_XFT
 230   else if (strcmp (key, GSETTINGS_MONO_FONT) == 0)
 231     {
 232       val = g_settings_get_value (settings, GSETTINGS_MONO_FONT);
 233       if (val)
 234         {
 235           g_variant_ref_sink (val);
 236           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 237             {
 238               const gchar *newfont = g_variant_get_string (val, NULL);
 239               store_monospaced_changed (newfont);
 240             }
 241           g_variant_unref (val);
 242         }
 243     }
 244   else if (strcmp (key, GSETTINGS_FONT_NAME) == 0)
 245     {
 246       val = g_settings_get_value (settings, GSETTINGS_FONT_NAME);
 247       if (val)
 248         {
 249           g_variant_ref_sink (val);
 250           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 251             {
 252               const gchar *newfont = g_variant_get_string (val, NULL);
 253               store_font_name_changed (newfont);
 254             }
 255           g_variant_unref (val);
 256         }
 257     }
 258 #endif /* HAVE_XFT */
 259 }
 260
 261 #endif /* HAVE_GSETTINGS */
 262
 263 #ifdef HAVE_GCONF
 264 #define GCONF_TOOL_BAR_STYLE "/desktop/gnome/interface/toolbar_style"
 265 #ifdef HAVE_XFT
 266 #define GCONF_MONO_FONT  "/desktop/gnome/interface/monospace_font_name"
 267 #define GCONF_FONT_NAME  "/desktop/gnome/interface/font_name"
 268 #endif
 269
 270 /* The single GConf instance, or NULL if not connected to GConf.  */
 271
 272 static GConfClient *gconf_client;
 273
 274 /* Callback called when something changed in GConf that we care about.  */
 275
 276 static void
 277 something_changed_gconfCB (GConfClient *client,
 278                            guint cnxn_id,
 279                            GConfEntry *entry,
 280                            gpointer user_data)
 281 {
 282   GConfValue *v = gconf_entry_get_value (entry);
 283   const char *key = gconf_entry_get_key (entry);
 284
 285   if (!v || v->type != GCONF_VALUE_STRING || ! key) return;
 286   if (strcmp (key, GCONF_TOOL_BAR_STYLE) == 0)
 287     {
 288       const char *value = gconf_value_get_string (v);
 289       store_tool_bar_style_changed (value, first_dpyinfo);
 290     }
 291 #ifdef HAVE_XFT
 292   else if (strcmp (key, GCONF_MONO_FONT) == 0)
 293     {
 294       const char *value = gconf_value_get_string (v);
 295       store_monospaced_changed (value);
 296     }
 297   else if (strcmp (key, GCONF_FONT_NAME) == 0)
 298     {
 299       const char *value = gconf_value_get_string (v);
 300       store_font_name_changed (value);
 301     }
 302 #endif /* HAVE_XFT */
 303 }
 304
 305 #endif /* HAVE_GCONF */
 306
 307 #ifdef HAVE_XFT
 308
 309 /* Older fontconfig versions don't have FC_LCD_*.  */
 310 #ifndef FC_LCD_NONE
 311 #define FC_LCD_NONE 0
 312 #endif
 313 #ifndef FC_LCD_DEFAULT
 314 #define FC_LCD_DEFAULT 1
 315 #endif
 316 #ifndef FC_LCD_FILTER
 317 #define FC_LCD_FILTER "lcdfilter"
 318 #endif
 319
 320 #endif /* HAVE_XFT */
 321
 322 /* Find the window that contains the XSETTINGS property values.  */
 323
 324 static void
 325 get_prop_window (struct x_display_info *dpyinfo)
 326 {
 327   Display *dpy = dpyinfo->display;
 328
 329   XGrabServer (dpy);
 330   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 331                                                   dpyinfo->Xatom_xsettings_sel);
 332   if (dpyinfo->xsettings_window != None)
 333     /* Select events so we can detect if window is deleted or if settings
 334        are changed.  */
 335     XSelectInput (dpy, dpyinfo->xsettings_window,
 336                   PropertyChangeMask|StructureNotifyMask);
 337
 338   XUngrabServer (dpy);
 339 }
 340
 341 #define SWAP32(nr) (((nr) << 24) | (((nr) << 8) & 0xff0000)     \
 342                     | (((nr) >> 8) & 0xff00) | ((nr) >> 24))
 343 #define SWAP16(nr) (((nr) << 8) | ((nr) >> 8))
 344 #define PAD(nr)    (((nr) + 3) & ~3)
 345
 346 /* Parse xsettings and extract those that deal with Xft.
 347    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 348    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 349
 350    Layout of prop.  First is a header:
 351
 352    bytes   type     what
 353    ------------------------------------
 354    1      CARD8    byte-order
 355    3               unused
 356    4      CARD32   SERIAL
 357    4      CARD32   N_SETTINGS
 358
 359    Then N_SETTINGS records, with header:
 360
 361    bytes   type          what
 362    ------------------------------------
 363    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 364    1                    unused
 365    2      CARD16        n == name-length
 366    n      STRING8       name
 367    p                    unused, p=pad_to_even_4(n)
 368    4      CARD32        last-change-serial
 369
 370    and then the value, For string:
 371
 372    bytes   type          what
 373    ------------------------------------
 374    4      CARD32        n = value-length
 375    n      STRING8       value
 376    p                    unused, p=pad_to_even_4(n)
 377
 378    For integer:
 379
 380    bytes   type          what
 381    ------------------------------------
 382    4      INT32         value
 383
 384    For RGB color:
 385
 386    bytes   type          what
 387    ------------------------------------
 388    2      CARD16        red
 389    2      CARD16        blue
 390    2      CARD16        green
 391    2      CARD16        alpha
 392
 393    Returns non-zero if some Xft settings was seen, zero otherwise.
 394 */
 395
 396 static int
 397 parse_settings (unsigned char *prop,
 398                 long unsigned int bytes,
 399                 struct xsettings *settings)
 400 {
 401   Lisp_Object byteorder = Fbyteorder ();
 402   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 403   int that_bo = prop[0];
 404   CARD32 n_settings;
 405   int bytes_parsed = 0;
 406   int settings_seen = 0;
 407   int i = 0;
 408
 409   /* First 4 bytes is a serial number, skip that.  */
 410
 411   if (bytes < 12) return BadLength;
 412   memcpy (&n_settings, prop+8, 4);
 413   if (my_bo != that_bo) n_settings = SWAP32 (n_settings);
 414   bytes_parsed = 12;
 415
 416   memset (settings, 0, sizeof (*settings));
 417
 418   while (bytes_parsed+4 < bytes && settings_seen < 7
 419          && i < n_settings)
 420     {
 421       int type = prop[bytes_parsed++];
 422       CARD16 nlen;
 423       CARD32 vlen, ival = 0;
 424       char name[128]; /* The names we are looking for are not this long.  */
 425       char sval[128]; /* The values we are looking for are not this long.  */
 426       int want_this;
 427       int to_cpy;
 428
 429       sval[0] = '\0';
 430       ++i;
 431       ++bytes_parsed; /* Padding */
 432
 433       memcpy (&nlen, prop+bytes_parsed, 2);
 434       bytes_parsed += 2;
 435       if (my_bo != that_bo) nlen = SWAP16 (nlen);
 436       if (bytes_parsed+nlen > bytes) return BadLength;
 437       to_cpy = nlen > 127 ? 127 : nlen;
 438       memcpy (name, prop+bytes_parsed, to_cpy);
 439       name[to_cpy] = '\0';
 440
 441       bytes_parsed += nlen;
 442       bytes_parsed = PAD (bytes_parsed);
 443
 444       bytes_parsed += 4; /* Skip serial for this value */
 445       if (bytes_parsed > bytes) return BadLength;
 446
 447       want_this =
 448 #ifdef HAVE_XFT
 449         (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
 450         || strcmp (XSETTINGS_FONT_NAME, name) == 0
 451         ||
 452 #endif
 453         strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0;
 454
 455       switch (type)
 456         {
 457         case 0: /* Integer */
 458           if (bytes_parsed+4 > bytes) return BadLength;
 459           if (want_this)
 460             {
 461               memcpy (&ival, prop+bytes_parsed, 4);
 462               if (my_bo != that_bo) ival = SWAP32 (ival);
 463             }
 464           bytes_parsed += 4;
 465           break;
 466
 467         case 1: /* String */
 468           if (bytes_parsed+4 > bytes) return BadLength;
 469           memcpy (&vlen, prop+bytes_parsed, 4);
 470           bytes_parsed += 4;
 471           if (my_bo != that_bo) vlen = SWAP32 (vlen);
 472           if (want_this)
 473             {
 474               to_cpy = vlen > 127 ? 127 : vlen;
 475               memcpy (sval, prop+bytes_parsed, to_cpy);
 476               sval[to_cpy] = '\0';
 477             }
 478           bytes_parsed += vlen;
 479           bytes_parsed = PAD (bytes_parsed);
 480           break;
 481
 482         case 2: /* RGB value */
 483           /* No need to parse this */
 484           if (bytes_parsed+8 > bytes) return BadLength;
 485           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 486           break;
 487
 488         default: /* Parse Error */
 489           return BadValue;
 490         }
 491
 492       if (want_this)
 493         {
 494           ++settings_seen;
 495           if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 496             {
 497               settings->tb_style = xstrdup (sval);
 498               settings->seen |= SEEN_TB_STYLE;
 499             }
 500 #ifdef HAVE_XFT
 501           else if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 502             {
 503               settings->font = xstrdup (sval);
 504               settings->seen |= SEEN_FONT;
 505             }
 506           else if (strcmp (name, "Xft/Antialias") == 0)
 507             {
 508               settings->seen |= SEEN_AA;
 509               settings->aa = ival != 0;
 510             }
 511           else if (strcmp (name, "Xft/Hinting") == 0)
 512             {
 513               settings->seen |= SEEN_HINTING;
 514               settings->hinting = ival != 0;
 515             }
 516 # ifdef FC_HINT_STYLE
 517           else if (strcmp (name, "Xft/HintStyle") == 0)
 518             {
 519               settings->seen |= SEEN_HINTSTYLE;
 520               if (strcmp (sval, "hintnone") == 0)
 521                 settings->hintstyle = FC_HINT_NONE;
 522               else if (strcmp (sval, "hintslight") == 0)
 523                 settings->hintstyle = FC_HINT_SLIGHT;
 524               else if (strcmp (sval, "hintmedium") == 0)
 525                 settings->hintstyle = FC_HINT_MEDIUM;
 526               else if (strcmp (sval, "hintfull") == 0)
 527                 settings->hintstyle = FC_HINT_FULL;
 528               else
 529                 settings->seen &= ~SEEN_HINTSTYLE;
 530             }
 531 # endif
 532           else if (strcmp (name, "Xft/RGBA") == 0)
 533             {
 534               settings->seen |= SEEN_RGBA;
 535               if (strcmp (sval, "none") == 0)
 536                 settings->rgba = FC_RGBA_NONE;
 537               else if (strcmp (sval, "rgb") == 0)
 538                 settings->rgba = FC_RGBA_RGB;
 539               else if (strcmp (sval, "bgr") == 0)
 540                 settings->rgba = FC_RGBA_BGR;
 541               else if (strcmp (sval, "vrgb") == 0)
 542                 settings->rgba = FC_RGBA_VRGB;
 543               else if (strcmp (sval, "vbgr") == 0)
 544                 settings->rgba = FC_RGBA_VBGR;
 545               else
 546                 settings->seen &= ~SEEN_RGBA;
 547             }
 548           else if (strcmp (name, "Xft/DPI") == 0)
 549             {
 550               settings->seen |= SEEN_DPI;
 551               settings->dpi = (double)ival/1024.0;
 552             }
 553           else if (strcmp (name, "Xft/lcdfilter") == 0)
 554             {
 555               settings->seen |= SEEN_LCDFILTER;
 556               if (strcmp (sval, "none") == 0)
 557                 settings->lcdfilter = FC_LCD_NONE;
 558               else if (strcmp (sval, "lcddefault") == 0)
 559                 settings->lcdfilter = FC_LCD_DEFAULT;
 560               else
 561                 settings->seen &= ~SEEN_LCDFILTER;
 562             }
 563 #endif /* HAVE_XFT */
 564         }
 565     }
 566
 567   return settings_seen;
 568 }
 569
 570 /* Read settings from the XSettings property window on display for DPYINFO.
 571    Store settings read in SETTINGS.
 572    Return non-zero if successful, zero if not.  */
 573
 574 static int
 575 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
 576 {
 577   Atom act_type;
 578   int act_form;
 579   unsigned long nitems, bytes_after;
 580   unsigned char *prop = NULL;
 581   Display *dpy = dpyinfo->display;
 582   int rc;
 583
 584   x_catch_errors (dpy);
 585   rc = XGetWindowProperty (dpy,
 586                            dpyinfo->xsettings_window,
 587                            dpyinfo->Xatom_xsettings_prop,
 588                            0, LONG_MAX, False, AnyPropertyType,
 589                            &act_type, &act_form, &nitems, &bytes_after,
 590                            &prop);
 591
 592   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 593       && act_type == dpyinfo->Xatom_xsettings_prop)
 594     rc = parse_settings (prop, nitems, settings);
 595
 596   XFree (prop);
 597
 598   x_uncatch_errors ();
 599
 600   return rc != 0;
 601 }
 602
 603 /* Apply Xft settings in SETTINGS to the Xft library.
 604    If SEND_EVENT_P is non-zero store a Lisp event that Xft settings changed.  */
 605
 606 static void
 607 apply_xft_settings (struct x_display_info *dpyinfo,
 608                     int send_event_p,
 609                     struct xsettings *settings)
 610 {
 611 #ifdef HAVE_XFT
 612   FcPattern *pat;
 613   struct xsettings oldsettings;
 614   int changed = 0;
 615
 616   memset (&oldsettings, 0, sizeof (oldsettings));
 617   pat = FcPatternCreate ();
 618   XftDefaultSubstitute (dpyinfo->display,
 619                         XScreenNumberOfScreen (dpyinfo->screen),
 620                         pat);
 621   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 622   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 623 #ifdef FC_HINT_STYLE
 624   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 625 #endif
 626   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 627   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 628   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 629
 630   if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
 631     {
 632       FcPatternDel (pat, FC_ANTIALIAS);
 633       FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
 634       ++changed;
 635       oldsettings.aa = settings->aa;
 636     }
 637
 638   if ((settings->seen & SEEN_HINTING) != 0
 639       && oldsettings.hinting != settings->hinting)
 640     {
 641       FcPatternDel (pat, FC_HINTING);
 642       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 643       ++changed;
 644       oldsettings.hinting = settings->hinting;
 645     }
 646   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 647     {
 648       FcPatternDel (pat, FC_RGBA);
 649       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 650       oldsettings.rgba = settings->rgba;
 651       ++changed;
 652     }
 653
 654   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 655   if ((settings->seen & SEEN_LCDFILTER) != 0
 656       && oldsettings.lcdfilter != settings->lcdfilter)
 657     {
 658       FcPatternDel (pat, FC_LCD_FILTER);
 659       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 660       ++changed;
 661       oldsettings.lcdfilter = settings->lcdfilter;
 662     }
 663
 664 #ifdef FC_HINT_STYLE
 665   if ((settings->seen & SEEN_HINTSTYLE) != 0
 666       && oldsettings.hintstyle != settings->hintstyle)
 667     {
 668       FcPatternDel (pat, FC_HINT_STYLE);
 669       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 670       ++changed;
 671       oldsettings.hintstyle = settings->hintstyle;
 672     }
 673 #endif
 674
 675   if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
 676       && settings->dpi > 0)
 677     {
 678       Lisp_Object frame, tail;
 679
 680       FcPatternDel (pat, FC_DPI);
 681       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 682       ++changed;
 683       oldsettings.dpi = settings->dpi;
 684
 685       /* Change the DPI on this display and all frames on the display.  */
 686       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 687       FOR_EACH_FRAME (tail, frame)
 688         if (FRAME_X_P (XFRAME (frame))
 689             && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
 690           XFRAME (frame)->resy = XFRAME (frame)->resx = settings->dpi;
 691     }
 692
 693   if (changed)
 694     {
 695       static char const format[] =
 696         "Antialias: %d, Hinting: %d, RGBA: %d, LCDFilter: %d, "
 697         "Hintstyle: %d, DPI: %lf";
 698       enum
 699       {
 700         d_formats = 5,
 701         d_growth = INT_BUFSIZE_BOUND (int) - sizeof "%d",
 702         lf_formats = 1,
 703         max_f_integer_digits = DBL_MAX_10_EXP + 1,
 704         f_precision = 6,
 705         lf_growth = (sizeof "-." + max_f_integer_digits + f_precision
 706                      - sizeof "%lf")
 707       };
 708       char buf[sizeof format + d_formats * d_growth + lf_formats * lf_growth];
 709
 710       XftDefaultSet (dpyinfo->display, pat);
 711       if (send_event_p)
 712         store_config_changed_event (Qfont_render,
 713                                     XCAR (dpyinfo->name_list_element));
 714       Vxft_settings
 715         = make_formatted_string (buf, format,
 716                                  oldsettings.aa, oldsettings.hinting,
 717                                  oldsettings.rgba, oldsettings.lcdfilter,
 718                                  oldsettings.hintstyle, oldsettings.dpi);
 719
 720     }
 721   else
 722     FcPatternDestroy (pat);
 723 #endif /* HAVE_XFT */
 724 }
 725
 726 /* Read XSettings from the display for DPYINFO.
 727    If SEND_EVENT_P is non-zero store a Lisp event settings that changed.  */
 728
 729 static void
 730 read_and_apply_settings (struct x_display_info *dpyinfo, int send_event_p)
 731 {
 732   struct xsettings settings;
 733
 734   if (!read_settings (dpyinfo, &settings))
 735     return;
 736
 737   apply_xft_settings (dpyinfo, True, &settings);
 738   if (settings.seen & SEEN_TB_STYLE)
 739     {
 740       if (send_event_p)
 741         store_tool_bar_style_changed (settings.tb_style, dpyinfo);
 742       else
 743         current_tool_bar_style = map_tool_bar_style (settings.tb_style);
 744       xfree (settings.tb_style);
 745     }
 746 #ifdef HAVE_XFT
 747   if (settings.seen & SEEN_FONT)
 748     {
 749       if (send_event_p)
 750         store_font_name_changed (settings.font);
 751       else
 752         {
 753           xfree (current_font);
 754           current_font = xstrdup (settings.font);
 755         }
 756       xfree (settings.font);
 757     }
 758 #endif
 759 }
 760
 761 /* Check if EVENT for the display in DPYINFO is XSettings related.  */
 762
 763 void
 764 xft_settings_event (struct x_display_info *dpyinfo, XEvent *event)
 765 {
 766   int check_window_p = 0;
 767   int apply_settings = 0;
 768
 769   switch (event->type)
 770     {
 771     case DestroyNotify:
 772       if (dpyinfo->xsettings_window == event->xany.window)
 773         check_window_p = 1;
 774       break;
 775
 776     case ClientMessage:
 777       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 778           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 779           && event->xclient.window == dpyinfo->root_window)
 780         check_window_p = 1;
 781       break;
 782
 783     case PropertyNotify:
 784       if (event->xproperty.window == dpyinfo->xsettings_window
 785           && event->xproperty.state == PropertyNewValue
 786           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 787         apply_settings = 1;
 788       break;
 789     }
 790
 791
 792   if (check_window_p)
 793     {
 794       dpyinfo->xsettings_window = None;
 795       get_prop_window (dpyinfo);
 796       if (dpyinfo->xsettings_window != None)
 797         apply_settings = 1;
 798     }
 799
 800   if (apply_settings)
 801     read_and_apply_settings (dpyinfo, True);
 802 }
 803
 804 /* Initialize GSettings and read startup values.  */
 805
 806 static void
 807 init_gsettings (void)
 808 {
 809 #ifdef HAVE_GSETTINGS
 810   GVariant *val;
 811   const gchar *const *schemas;
 812   int schema_found = 0;
 813
 814 #ifdef HAVE_G_TYPE_INIT
 815   g_type_init ();
 816 #endif
 817
 818   schemas = g_settings_list_schemas ();
 819   if (schemas == NULL) return;
 820   while (! schema_found && *schemas != NULL)
 821     schema_found = strcmp (*schemas++, GSETTINGS_SCHEMA) == 0;
 822   if (!schema_found) return;
 823
 824   gsettings_client = g_settings_new (GSETTINGS_SCHEMA);
 825   if (!gsettings_client) return;
 826   g_object_ref_sink (G_OBJECT (gsettings_client));
 827   g_signal_connect (G_OBJECT (gsettings_client), "changed",
 828                     G_CALLBACK (something_changed_gsettingsCB), NULL);
 829
 830   val = g_settings_get_value (gsettings_client, GSETTINGS_TOOL_BAR_STYLE);
 831   if (val)
 832     {
 833       g_variant_ref_sink (val);
 834       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 835         current_tool_bar_style
 836           = map_tool_bar_style (g_variant_get_string (val, NULL));
 837       g_variant_unref (val);
 838     }
 839
 840 #ifdef HAVE_XFT
 841   val = g_settings_get_value (gsettings_client, GSETTINGS_MONO_FONT);
 842   if (val)
 843     {
 844       g_variant_ref_sink (val);
 845       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 846         current_mono_font = xstrdup (g_variant_get_string (val, NULL));
 847       g_variant_unref (val);
 848     }
 849
 850   val = g_settings_get_value (gsettings_client, GSETTINGS_FONT_NAME);
 851   if (val)
 852     {
 853       g_variant_ref_sink (val);
 854       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 855         current_font = xstrdup (g_variant_get_string (val, NULL));
 856       g_variant_unref (val);
 857     }
 858 #endif /* HAVE_XFT */
 859
 860 #endif /* HAVE_GSETTINGS */
 861 }
 862
 863 /* Init GConf and read startup values.  */
 864
 865 static void
 866 init_gconf (void)
 867 {
 868 #if defined (HAVE_GCONF)
 869   char *s;
 870
 871 #ifdef HAVE_G_TYPE_INIT
 872   g_type_init ();
 873 #endif
 874
 875   gconf_client = gconf_client_get_default ();
 876   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 877   gconf_client_add_dir (gconf_client,
 878                         GCONF_TOOL_BAR_STYLE,
 879                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 880                         NULL);
 881   gconf_client_notify_add (gconf_client,
 882                            GCONF_TOOL_BAR_STYLE,
 883                            something_changed_gconfCB,
 884                            NULL, NULL, NULL);
 885
 886   s = gconf_client_get_string (gconf_client, GCONF_TOOL_BAR_STYLE, NULL);
 887   if (s)
 888     {
 889       current_tool_bar_style = map_tool_bar_style (s);
 890       g_free (s);
 891     }
 892
 893 #ifdef HAVE_XFT
 894   s = gconf_client_get_string (gconf_client, GCONF_MONO_FONT, NULL);
 895   if (s)
 896     {
 897       current_mono_font = xstrdup (s);
 898       g_free (s);
 899     }
 900   s = gconf_client_get_string (gconf_client, GCONF_FONT_NAME, NULL);
 901   if (s)
 902     {
 903       current_font = xstrdup (s);
 904       g_free (s);
 905     }
 906   gconf_client_add_dir (gconf_client,
 907                         GCONF_MONO_FONT,
 908                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 909                         NULL);
 910   gconf_client_notify_add (gconf_client,
 911                            GCONF_MONO_FONT,
 912                            something_changed_gconfCB,
 913                            NULL, NULL, NULL);
 914   gconf_client_add_dir (gconf_client,
 915                         GCONF_FONT_NAME,
 916                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 917                         NULL);
 918   gconf_client_notify_add (gconf_client,
 919                            GCONF_FONT_NAME,
 920                            something_changed_gconfCB,
 921                            NULL, NULL, NULL);
 922 #endif /* HAVE_XFT */
 923 #endif /* HAVE_GCONF */
 924 }
 925
 926 /* Init Xsettings and read startup values.  */
 927
 928 static void
 929 init_xsettings (struct x_display_info *dpyinfo)
 930 {
 931   Display *dpy = dpyinfo->display;
 932
 933   BLOCK_INPUT;
 934
 935   /* Select events so we can detect client messages sent when selection
 936      owner changes.  */
 937   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 938
 939   get_prop_window (dpyinfo);
 940   if (dpyinfo->xsettings_window != None)
 941     read_and_apply_settings (dpyinfo, False);
 942
 943   UNBLOCK_INPUT;
 944 }
 945
 946 void
 947 xsettings_initialize (struct x_display_info *dpyinfo)
 948 {
 949   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 950   init_gconf ();
 951   init_xsettings (dpyinfo);
 952   init_gsettings ();
 953 }
 954
 955 /* Return the system monospaced font.
 956    May be NULL if not known.  */
 957
 958 const char *
 959 xsettings_get_system_font (void)
 960 {
 961   return current_mono_font;
 962 }
 963
 964 #ifdef USE_LUCID
 965 /* Return the system font.
 966    May be NULL if not known.  */
 967
 968 const char *
 969 xsettings_get_system_normal_font (void)
 970 {
 971   return current_font;
 972 }
 973 #endif
 974
 975 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 976        Sfont_get_system_normal_font,
 977        0, 0, 0,
 978        doc: /* Get the system default application font. */)
 979   (void)
 980 {
 981   return current_font ? build_string (current_font) : Qnil;
 982 }
 983
 984 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 985        0, 0, 0,
 986        doc: /* Get the system default fixed width font. */)
 987   (void)
 988 {
 989   return current_mono_font ? build_string (current_mono_font) : Qnil;
 990 }
 991
 992 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
 993        Stool_bar_get_system_style, 0, 0, 0,
 994        doc: /* Get the system tool bar style.
 995 If no system tool bar style is known, return `tool-bar-style' if set to a
 996 known style.  Otherwise return image.  */)
 997   (void)
 998 {
 999   if (EQ (Vtool_bar_style, Qimage)
1000       || EQ (Vtool_bar_style, Qtext)
1001       || EQ (Vtool_bar_style, Qboth)
1002       || EQ (Vtool_bar_style, Qboth_horiz)
1003       || EQ (Vtool_bar_style, Qtext_image_horiz))
1004     return Vtool_bar_style;
1005   if (!NILP (current_tool_bar_style))
1006     return current_tool_bar_style;
1007   return Qimage;
1008 }
1009
1010 void
1011 syms_of_xsettings (void)
1012 {
1013   current_mono_font = NULL;
1014   current_font = NULL;
1015   first_dpyinfo = NULL;
1016 #ifdef HAVE_GSETTINGS
1017   gsettings_client = NULL;
1018 #endif
1019 #ifdef HAVE_GCONF
1020   gconf_client = NULL;
1021 #endif
1022
1023   DEFSYM (Qmonospace_font_name, "monospace-font-name");
1024   DEFSYM (Qfont_name, "font-name");
1025   DEFSYM (Qfont_render, "font-render");
1026   defsubr (&Sfont_get_system_font);
1027   defsubr (&Sfont_get_system_normal_font);
1028
1029   DEFVAR_BOOL ("font-use-system-font", use_system_font,
1030     doc: /* Non-nil means to apply the system defined font dynamically.
1031 When this is non-nil and the system defined fixed width font changes, we
1032 update frames dynamically.
1033 If this variable is nil, Emacs ignores system font changes.  */);
1034   use_system_font = 0;
1035
1036   DEFVAR_LISP ("xft-settings", Vxft_settings,
1037                doc: /* Font settings applied to Xft.  */);
1038   Vxft_settings = empty_unibyte_string;
1039
1040 #ifdef HAVE_XFT
1041   Fprovide (intern_c_string ("font-render-setting"), Qnil);
1042 #if defined (HAVE_GCONF) || defined (HAVE_GSETTINGS)
1043   Fprovide (intern_c_string ("system-font-setting"), Qnil);
1044 #endif
1045 #endif
1046
1047   current_tool_bar_style = Qnil;
1048   DEFSYM (Qtool_bar_style, "tool-bar-style");
1049   defsubr (&Stool_bar_get_system_style);
1050
1051   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
1052 }