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 true if DPYINFO is still valid.  */
  72 static bool
  73 dpyinfo_valid (struct x_display_info *dpyinfo)
  74 {
  75   bool found = false;
  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   dupstring (&current_mono_font, 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   dupstring (&current_font, newfont);
 114
 115   if (dpyinfo_valid (first_dpyinfo))
 116     {
 117       store_config_changed_event (Qfont_name,
 118                                   XCAR (first_dpyinfo->name_list_element));
 119     }
 120 }
 121 #endif /* HAVE_XFT */
 122
 123 /* Map TOOL_BAR_STYLE from a string to its corresponding Lisp value.
 124    Return Qnil if TOOL_BAR_STYLE is not known.  */
 125
 126 static Lisp_Object
 127 map_tool_bar_style (const char *tool_bar_style)
 128 {
 129   Lisp_Object style = Qnil;
 130   if (tool_bar_style)
 131     {
 132       if (strcmp (tool_bar_style, "both") == 0)
 133         style = Qboth;
 134       else if (strcmp (tool_bar_style, "both-horiz") == 0)
 135         style = Qboth_horiz;
 136       else if (strcmp (tool_bar_style, "icons") == 0)
 137         style = Qimage;
 138       else if (strcmp (tool_bar_style, "text") == 0)
 139         style = Qtext;
 140     }
 141
 142   return style;
 143 }
 144
 145 /* Store a tool bar style change event if the tool bar style changed.  */
 146
 147 static void
 148 store_tool_bar_style_changed (const char *newstyle,
 149                               struct x_display_info *dpyinfo)
 150 {
 151   Lisp_Object style = map_tool_bar_style (newstyle);
 152   if (EQ (current_tool_bar_style, style))
 153     return; /* No change. */
 154
 155   current_tool_bar_style = style;
 156   if (dpyinfo_valid (dpyinfo))
 157     store_config_changed_event (Qtool_bar_style,
 158                                 XCAR (dpyinfo->name_list_element));
 159 }
 160
 161 #ifdef HAVE_XFT
 162 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
 163 #endif
 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 PAD(nr)    (((nr) + 3) & ~3)
 341
 342 /* Parse xsettings and extract those that deal with Xft.
 343    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 344    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 345
 346    Layout of prop.  First is a header:
 347
 348    bytes   type     what
 349    ------------------------------------
 350    1      CARD8    byte-order
 351    3               unused
 352    4      CARD32   SERIAL
 353    4      CARD32   N_SETTINGS
 354
 355    Then N_SETTINGS records, with header:
 356
 357    bytes   type          what
 358    ------------------------------------
 359    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 360    1                    unused
 361    2      CARD16        n == name-length
 362    n      STRING8       name
 363    p                    unused, p=pad_to_even_4(n)
 364    4      CARD32        last-change-serial
 365
 366    and then the value, For string:
 367
 368    bytes   type          what
 369    ------------------------------------
 370    4      CARD32        n = value-length
 371    n      STRING8       value
 372    p                    unused, p=pad_to_even_4(n)
 373
 374    For integer:
 375
 376    bytes   type          what
 377    ------------------------------------
 378    4      INT32         value
 379
 380    For RGB color:
 381
 382    bytes   type          what
 383    ------------------------------------
 384    2      CARD16        red
 385    2      CARD16        blue
 386    2      CARD16        green
 387    2      CARD16        alpha
 388
 389    Returns non-zero if some Xft settings was seen, zero otherwise.
 390 */
 391
 392 static int
 393 parse_settings (unsigned char *prop,
 394                 unsigned long bytes,
 395                 struct xsettings *settings)
 396 {
 397   Lisp_Object byteorder = Fbyteorder ();
 398   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 399   int that_bo = prop[0];
 400   CARD32 n_settings;
 401   int bytes_parsed = 0;
 402   int settings_seen = 0;
 403   int i = 0;
 404
 405   /* First 4 bytes is a serial number, skip that.  */
 406
 407   if (bytes < 12) return settings_seen;
 408   memcpy (&n_settings, prop+8, 4);
 409   if (my_bo != that_bo) n_settings = bswap_32 (n_settings);
 410   bytes_parsed = 12;
 411
 412   memset (settings, 0, sizeof (*settings));
 413
 414   while (bytes_parsed+4 < bytes && settings_seen < 7
 415          && i < n_settings)
 416     {
 417       int type = prop[bytes_parsed++];
 418       CARD16 nlen;
 419       CARD32 vlen, ival = 0;
 420       char name[128]; /* The names we are looking for are not this long.  */
 421       char sval[128]; /* The values we are looking for are not this long.  */
 422       bool want_this;
 423       int to_cpy;
 424
 425       sval[0] = '\0';
 426       ++i;
 427       ++bytes_parsed; /* Padding */
 428
 429       memcpy (&nlen, prop+bytes_parsed, 2);
 430       bytes_parsed += 2;
 431       if (my_bo != that_bo) nlen = bswap_16 (nlen);
 432       if (bytes_parsed + nlen > bytes) return settings_seen;
 433       to_cpy = min (nlen, sizeof name - 1);
 434       memcpy (name, prop+bytes_parsed, to_cpy);
 435       name[to_cpy] = '\0';
 436
 437       bytes_parsed += nlen;
 438       bytes_parsed = PAD (bytes_parsed);
 439
 440       bytes_parsed += 4; /* Skip serial for this value */
 441       if (bytes_parsed > bytes) return settings_seen;
 442
 443       want_this = strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0;
 444 #ifdef HAVE_XFT
 445       if ((nlen > 6 && memcmp (name, "Xft/", 4) == 0)
 446           || strcmp (XSETTINGS_FONT_NAME, name) == 0)
 447         want_this = true;
 448 #endif
 449
 450       switch (type)
 451         {
 452         case 0: /* Integer */
 453           if (bytes_parsed + 4 > bytes) return settings_seen;
 454           if (want_this)
 455             {
 456               memcpy (&ival, prop+bytes_parsed, 4);
 457               if (my_bo != that_bo) ival = bswap_32 (ival);
 458             }
 459           bytes_parsed += 4;
 460           break;
 461
 462         case 1: /* String */
 463           if (bytes_parsed + 4 > bytes) return settings_seen;
 464           memcpy (&vlen, prop+bytes_parsed, 4);
 465           bytes_parsed += 4;
 466           if (my_bo != that_bo) vlen = bswap_32 (vlen);
 467           if (want_this)
 468             {
 469               to_cpy = min (vlen, sizeof sval - 1);
 470               memcpy (sval, prop+bytes_parsed, to_cpy);
 471               sval[to_cpy] = '\0';
 472             }
 473           bytes_parsed += vlen;
 474           bytes_parsed = PAD (bytes_parsed);
 475           break;
 476
 477         case 2: /* RGB value */
 478           /* No need to parse this */
 479           if (bytes_parsed + 8 > bytes) return settings_seen;
 480           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 481           break;
 482
 483         default: /* Parse Error */
 484           return settings_seen;
 485         }
 486
 487       if (want_this)
 488         {
 489           if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 490             {
 491               dupstring (&settings->tb_style, sval);
 492               settings->seen |= SEEN_TB_STYLE;
 493             }
 494 #ifdef HAVE_XFT
 495           else if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 496             {
 497               dupstring (&settings->font, sval);
 498               settings->seen |= SEEN_FONT;
 499             }
 500           else if (strcmp (name, "Xft/Antialias") == 0)
 501             {
 502               settings->seen |= SEEN_AA;
 503               settings->aa = ival != 0;
 504             }
 505           else if (strcmp (name, "Xft/Hinting") == 0)
 506             {
 507               settings->seen |= SEEN_HINTING;
 508               settings->hinting = ival != 0;
 509             }
 510 # ifdef FC_HINT_STYLE
 511           else if (strcmp (name, "Xft/HintStyle") == 0)
 512             {
 513               settings->seen |= SEEN_HINTSTYLE;
 514               if (strcmp (sval, "hintnone") == 0)
 515                 settings->hintstyle = FC_HINT_NONE;
 516               else if (strcmp (sval, "hintslight") == 0)
 517                 settings->hintstyle = FC_HINT_SLIGHT;
 518               else if (strcmp (sval, "hintmedium") == 0)
 519                 settings->hintstyle = FC_HINT_MEDIUM;
 520               else if (strcmp (sval, "hintfull") == 0)
 521                 settings->hintstyle = FC_HINT_FULL;
 522               else
 523                 settings->seen &= ~SEEN_HINTSTYLE;
 524             }
 525 # endif
 526           else if (strcmp (name, "Xft/RGBA") == 0)
 527             {
 528               settings->seen |= SEEN_RGBA;
 529               if (strcmp (sval, "none") == 0)
 530                 settings->rgba = FC_RGBA_NONE;
 531               else if (strcmp (sval, "rgb") == 0)
 532                 settings->rgba = FC_RGBA_RGB;
 533               else if (strcmp (sval, "bgr") == 0)
 534                 settings->rgba = FC_RGBA_BGR;
 535               else if (strcmp (sval, "vrgb") == 0)
 536                 settings->rgba = FC_RGBA_VRGB;
 537               else if (strcmp (sval, "vbgr") == 0)
 538                 settings->rgba = FC_RGBA_VBGR;
 539               else
 540                 settings->seen &= ~SEEN_RGBA;
 541             }
 542           else if (strcmp (name, "Xft/DPI") == 0)
 543             {
 544               settings->seen |= SEEN_DPI;
 545               settings->dpi = (double)ival/1024.0;
 546             }
 547           else if (strcmp (name, "Xft/lcdfilter") == 0)
 548             {
 549               settings->seen |= SEEN_LCDFILTER;
 550               if (strcmp (sval, "none") == 0)
 551                 settings->lcdfilter = FC_LCD_NONE;
 552               else if (strcmp (sval, "lcddefault") == 0)
 553                 settings->lcdfilter = FC_LCD_DEFAULT;
 554               else
 555                 settings->seen &= ~SEEN_LCDFILTER;
 556             }
 557 #endif /* HAVE_XFT */
 558           else
 559             want_this = false;
 560           settings_seen += want_this;
 561         }
 562     }
 563
 564   return settings_seen;
 565 }
 566
 567 /* Read settings from the XSettings property window on display for DPYINFO.
 568    Store settings read in SETTINGS.
 569    Return true iff successful.  */
 570
 571 static bool
 572 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
 573 {
 574   Atom act_type;
 575   int act_form;
 576   unsigned long nitems, bytes_after;
 577   unsigned char *prop = NULL;
 578   Display *dpy = dpyinfo->display;
 579   int rc;
 580   bool got_settings = false;
 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     got_settings = parse_settings (prop, nitems, settings) != 0;
 593
 594   XFree (prop);
 595
 596   x_uncatch_errors ();
 597
 598   return got_settings;
 599 }
 600
 601 /* Apply Xft settings in SETTINGS to the Xft library.
 602    Store a Lisp event that Xft settings changed.  */
 603
 604 static void
 605 apply_xft_settings (struct x_display_info *dpyinfo,
 606                     struct xsettings *settings)
 607 {
 608 #ifdef HAVE_XFT
 609   FcPattern *pat;
 610   struct xsettings oldsettings;
 611   bool changed = false;
 612
 613   memset (&oldsettings, 0, sizeof (oldsettings));
 614   pat = FcPatternCreate ();
 615   XftDefaultSubstitute (dpyinfo->display,
 616                         XScreenNumberOfScreen (dpyinfo->screen),
 617                         pat);
 618   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 619   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 620 #ifdef FC_HINT_STYLE
 621   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 622 #endif
 623   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 624   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 625   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 626
 627   if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
 628     {
 629       FcPatternDel (pat, FC_ANTIALIAS);
 630       FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
 631       changed = true;
 632       oldsettings.aa = settings->aa;
 633     }
 634
 635   if ((settings->seen & SEEN_HINTING) != 0
 636       && oldsettings.hinting != settings->hinting)
 637     {
 638       FcPatternDel (pat, FC_HINTING);
 639       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 640       changed = true;
 641       oldsettings.hinting = settings->hinting;
 642     }
 643   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 644     {
 645       FcPatternDel (pat, FC_RGBA);
 646       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 647       oldsettings.rgba = settings->rgba;
 648       changed = true;
 649     }
 650
 651   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 652   if ((settings->seen & SEEN_LCDFILTER) != 0
 653       && oldsettings.lcdfilter != settings->lcdfilter)
 654     {
 655       FcPatternDel (pat, FC_LCD_FILTER);
 656       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 657       changed = true;
 658       oldsettings.lcdfilter = settings->lcdfilter;
 659     }
 660
 661 #ifdef FC_HINT_STYLE
 662   if ((settings->seen & SEEN_HINTSTYLE) != 0
 663       && oldsettings.hintstyle != settings->hintstyle)
 664     {
 665       FcPatternDel (pat, FC_HINT_STYLE);
 666       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 667       changed = true;
 668       oldsettings.hintstyle = settings->hintstyle;
 669     }
 670 #endif
 671
 672   if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
 673       && settings->dpi > 0)
 674     {
 675       FcPatternDel (pat, FC_DPI);
 676       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 677       changed = true;
 678       oldsettings.dpi = settings->dpi;
 679
 680       /* Changing the DPI on this display affects all frames on it.
 681          Check FRAME_RES_X and FRAME_RES_Y in frame.h to see how.  */
 682       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 683     }
 684
 685   if (changed)
 686     {
 687       static char const format[] =
 688         "Antialias: %d, Hinting: %d, RGBA: %d, LCDFilter: %d, "
 689         "Hintstyle: %d, DPI: %f";
 690       enum
 691       {
 692         d_formats = 5,
 693         d_growth = INT_BUFSIZE_BOUND (int) - sizeof "%d",
 694         lf_formats = 1,
 695         max_f_integer_digits = DBL_MAX_10_EXP + 1,
 696         f_precision = 6,
 697         lf_growth = (sizeof "-." + max_f_integer_digits + f_precision
 698                      - sizeof "%f")
 699       };
 700       char buf[sizeof format + d_formats * d_growth + lf_formats * lf_growth];
 701
 702       XftDefaultSet (dpyinfo->display, pat);
 703       store_config_changed_event (Qfont_render,
 704                                   XCAR (dpyinfo->name_list_element));
 705       Vxft_settings
 706         = make_formatted_string (buf, format,
 707                                  oldsettings.aa, oldsettings.hinting,
 708                                  oldsettings.rgba, oldsettings.lcdfilter,
 709                                  oldsettings.hintstyle, oldsettings.dpi);
 710
 711     }
 712   else
 713     FcPatternDestroy (pat);
 714 #endif /* HAVE_XFT */
 715 }
 716
 717 /* Read XSettings from the display for DPYINFO.
 718    If SEND_EVENT_P store a Lisp event settings that changed.  */
 719
 720 static void
 721 read_and_apply_settings (struct x_display_info *dpyinfo, bool send_event_p)
 722 {
 723   struct xsettings settings;
 724
 725   if (!read_settings (dpyinfo, &settings))
 726     return;
 727
 728   apply_xft_settings (dpyinfo, &settings);
 729   if (settings.seen & SEEN_TB_STYLE)
 730     {
 731       if (send_event_p)
 732         store_tool_bar_style_changed (settings.tb_style, dpyinfo);
 733       else
 734         current_tool_bar_style = map_tool_bar_style (settings.tb_style);
 735       xfree (settings.tb_style);
 736     }
 737 #ifdef HAVE_XFT
 738   if (settings.seen & SEEN_FONT)
 739     {
 740       if (send_event_p)
 741         store_font_name_changed (settings.font);
 742       else
 743         dupstring (&current_font, settings.font);
 744       xfree (settings.font);
 745     }
 746 #endif
 747 }
 748
 749 /* Check if EVENT for the display in DPYINFO is XSettings related.  */
 750
 751 void
 752 xft_settings_event (struct x_display_info *dpyinfo, const XEvent *event)
 753 {
 754   bool check_window_p = false, apply_settings_p = false;
 755
 756   switch (event->type)
 757     {
 758     case DestroyNotify:
 759       if (dpyinfo->xsettings_window == event->xany.window)
 760         check_window_p = true;
 761       break;
 762
 763     case ClientMessage:
 764       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 765           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 766           && event->xclient.window == dpyinfo->root_window)
 767         check_window_p = true;
 768       break;
 769
 770     case PropertyNotify:
 771       if (event->xproperty.window == dpyinfo->xsettings_window
 772           && event->xproperty.state == PropertyNewValue
 773           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 774         apply_settings_p = true;
 775       break;
 776     }
 777
 778
 779   if (check_window_p)
 780     {
 781       dpyinfo->xsettings_window = None;
 782       get_prop_window (dpyinfo);
 783       if (dpyinfo->xsettings_window != None)
 784         apply_settings_p = true;
 785     }
 786
 787   if (apply_settings_p)
 788     read_and_apply_settings (dpyinfo, true);
 789 }
 790
 791 /* Initialize GSettings and read startup values.  */
 792
 793 static void
 794 init_gsettings (void)
 795 {
 796 #ifdef HAVE_GSETTINGS
 797   GVariant *val;
 798   bool schema_found = false;
 799
 800 #if ! GLIB_CHECK_VERSION (2, 36, 0)
 801   g_type_init ();
 802 #endif
 803
 804 #if GLIB_CHECK_VERSION (2, 32, 0)
 805   {
 806     GSettingsSchema *sc = g_settings_schema_source_lookup
 807       (g_settings_schema_source_get_default (),
 808        GSETTINGS_SCHEMA,
 809        TRUE);
 810     schema_found = sc != NULL;
 811     if (sc) g_settings_schema_unref (sc);
 812   }
 813 #else
 814   {
 815     const gchar *const *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   }
 820 #endif
 821   if (!schema_found) return;
 822
 823   gsettings_client = g_settings_new (GSETTINGS_SCHEMA);
 824   if (!gsettings_client) return;
 825   g_object_ref_sink (G_OBJECT (gsettings_client));
 826   g_signal_connect (G_OBJECT (gsettings_client), "changed",
 827                     G_CALLBACK (something_changed_gsettingsCB), NULL);
 828
 829   val = g_settings_get_value (gsettings_client, GSETTINGS_TOOL_BAR_STYLE);
 830   if (val)
 831     {
 832       g_variant_ref_sink (val);
 833       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 834         current_tool_bar_style
 835           = map_tool_bar_style (g_variant_get_string (val, NULL));
 836       g_variant_unref (val);
 837     }
 838
 839 #ifdef HAVE_XFT
 840   val = g_settings_get_value (gsettings_client, GSETTINGS_MONO_FONT);
 841   if (val)
 842     {
 843       g_variant_ref_sink (val);
 844       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 845         dupstring (&current_mono_font, g_variant_get_string (val, NULL));
 846       g_variant_unref (val);
 847     }
 848
 849   val = g_settings_get_value (gsettings_client, GSETTINGS_FONT_NAME);
 850   if (val)
 851     {
 852       g_variant_ref_sink (val);
 853       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 854         dupstring (&current_font, g_variant_get_string (val, NULL));
 855       g_variant_unref (val);
 856     }
 857 #endif /* HAVE_XFT */
 858
 859 #endif /* HAVE_GSETTINGS */
 860 }
 861
 862 /* Init GConf and read startup values.  */
 863
 864 static void
 865 init_gconf (void)
 866 {
 867 #if defined (HAVE_GCONF)
 868   char *s;
 869
 870 #if ! GLIB_CHECK_VERSION (2, 36, 0)
 871   g_type_init ();
 872 #endif
 873
 874   gconf_client = gconf_client_get_default ();
 875   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 876   gconf_client_add_dir (gconf_client,
 877                         GCONF_TOOL_BAR_STYLE,
 878                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 879                         NULL);
 880   gconf_client_notify_add (gconf_client,
 881                            GCONF_TOOL_BAR_STYLE,
 882                            something_changed_gconfCB,
 883                            NULL, NULL, NULL);
 884
 885   s = gconf_client_get_string (gconf_client, GCONF_TOOL_BAR_STYLE, NULL);
 886   if (s)
 887     {
 888       current_tool_bar_style = map_tool_bar_style (s);
 889       g_free (s);
 890     }
 891
 892 #ifdef HAVE_XFT
 893   s = gconf_client_get_string (gconf_client, GCONF_MONO_FONT, NULL);
 894   if (s)
 895     {
 896       dupstring (&current_mono_font, s);
 897       g_free (s);
 898     }
 899   s = gconf_client_get_string (gconf_client, GCONF_FONT_NAME, NULL);
 900   if (s)
 901     {
 902       dupstring (&current_font, s);
 903       g_free (s);
 904     }
 905   gconf_client_add_dir (gconf_client,
 906                         GCONF_MONO_FONT,
 907                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 908                         NULL);
 909   gconf_client_notify_add (gconf_client,
 910                            GCONF_MONO_FONT,
 911                            something_changed_gconfCB,
 912                            NULL, NULL, NULL);
 913   gconf_client_add_dir (gconf_client,
 914                         GCONF_FONT_NAME,
 915                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 916                         NULL);
 917   gconf_client_notify_add (gconf_client,
 918                            GCONF_FONT_NAME,
 919                            something_changed_gconfCB,
 920                            NULL, NULL, NULL);
 921 #endif /* HAVE_XFT */
 922 #endif /* HAVE_GCONF */
 923 }
 924
 925 /* Init Xsettings and read startup values.  */
 926
 927 static void
 928 init_xsettings (struct x_display_info *dpyinfo)
 929 {
 930   Display *dpy = dpyinfo->display;
 931
 932   block_input ();
 933
 934   /* Select events so we can detect client messages sent when selection
 935      owner changes.  */
 936   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 937
 938   get_prop_window (dpyinfo);
 939   if (dpyinfo->xsettings_window != None)
 940     read_and_apply_settings (dpyinfo, false);
 941
 942   unblock_input ();
 943 }
 944
 945 void
 946 xsettings_initialize (struct x_display_info *dpyinfo)
 947 {
 948   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 949   init_gconf ();
 950   init_xsettings (dpyinfo);
 951   init_gsettings ();
 952 }
 953
 954 /* Return the system monospaced font.
 955    May be NULL if not known.  */
 956
 957 const char *
 958 xsettings_get_system_font (void)
 959 {
 960   return current_mono_font;
 961 }
 962
 963 #ifdef USE_LUCID
 964 /* Return the system font.
 965    May be NULL if not known.  */
 966
 967 const char *
 968 xsettings_get_system_normal_font (void)
 969 {
 970   return current_font;
 971 }
 972 #endif
 973
 974 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 975        Sfont_get_system_normal_font,
 976        0, 0, 0,
 977        doc: /* Get the system default application font. */)
 978   (void)
 979 {
 980   return current_font ? build_string (current_font) : Qnil;
 981 }
 982
 983 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 984        0, 0, 0,
 985        doc: /* Get the system default fixed width font. */)
 986   (void)
 987 {
 988   return current_mono_font ? build_string (current_mono_font) : Qnil;
 989 }
 990
 991 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
 992        Stool_bar_get_system_style, 0, 0, 0,
 993        doc: /* Get the system tool bar style.
 994 If no system tool bar style is known, return `tool-bar-style' if set to a
 995 known style.  Otherwise return image.  */)
 996   (void)
 997 {
 998   if (EQ (Vtool_bar_style, Qimage)
 999       || EQ (Vtool_bar_style, Qtext)
1000       || EQ (Vtool_bar_style, Qboth)
1001       || EQ (Vtool_bar_style, Qboth_horiz)
1002       || EQ (Vtool_bar_style, Qtext_image_horiz))
1003     return Vtool_bar_style;
1004   if (!NILP (current_tool_bar_style))
1005     return current_tool_bar_style;
1006   return Qimage;
1007 }
1008
1009 void
1010 syms_of_xsettings (void)
1011 {
1012   current_mono_font = NULL;
1013   current_font = NULL;
1014   first_dpyinfo = NULL;
1015 #ifdef HAVE_GSETTINGS
1016   gsettings_client = NULL;
1017 #endif
1018 #ifdef HAVE_GCONF
1019   gconf_client = NULL;
1020 #endif
1021
1022   DEFSYM (Qmonospace_font_name, "monospace-font-name");
1023   DEFSYM (Qfont_name, "font-name");
1024   DEFSYM (Qfont_render, "font-render");
1025   defsubr (&Sfont_get_system_font);
1026   defsubr (&Sfont_get_system_normal_font);
1027
1028   DEFVAR_BOOL ("font-use-system-font", use_system_font,
1029     doc: /* Non-nil means to apply the system defined font dynamically.
1030 When this is non-nil and the system defined fixed width font changes, we
1031 update frames dynamically.
1032 If this variable is nil, Emacs ignores system font changes.  */);
1033   use_system_font = false;
1034
1035   DEFVAR_LISP ("xft-settings", Vxft_settings,
1036                doc: /* Font settings applied to Xft.  */);
1037   Vxft_settings = empty_unibyte_string;
1038
1039 #ifdef HAVE_XFT
1040   Fprovide (intern_c_string ("font-render-setting"), Qnil);
1041 #if defined (HAVE_GCONF) || defined (HAVE_GSETTINGS)
1042   Fprovide (intern_c_string ("system-font-setting"), Qnil);
1043 #endif
1044 #endif
1045
1046   current_tool_bar_style = Qnil;
1047   DEFSYM (Qtool_bar_style, "tool-bar-style");
1048   defsubr (&Stool_bar_get_system_style);
1049
1050   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
1051 }