src/xsettings.c

   1 /* Functions for handling font and other changes dynamically.
   2
   3 Copyright (C) 2009-2013 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 #include "lisp.h"
  26 #include "xterm.h"
  27 #include "xsettings.h"
  28 #include "frame.h"
  29 #include "keyboard.h"
  30 #include "blockinput.h"
  31 #include "termhooks.h"
  32
  33 #include <X11/Xproto.h>
  34
  35 #ifdef HAVE_GSETTINGS
  36 #include <glib-object.h>
  37 #include <gio/gio.h>
  38 #endif
  39
  40 #ifdef HAVE_GCONF
  41 #include <gconf/gconf-client.h>
  42 #endif
  43
  44 #ifdef HAVE_XFT
  45 #include <X11/Xft/Xft.h>
  46 #endif
  47
  48 static char *current_mono_font;
  49 static char *current_font;
  50 static struct x_display_info *first_dpyinfo;
  51 static Lisp_Object Qmonospace_font_name, Qfont_name, Qfont_render,
  52   Qtool_bar_style;
  53 static Lisp_Object current_tool_bar_style;
  54
  55 /* Store an config changed event in to the event queue.  */
  56
  57 static void
  58 store_config_changed_event (Lisp_Object arg, Lisp_Object display_name)
  59 {
  60   struct input_event event;
  61   EVENT_INIT (event);
  62   event.kind = CONFIG_CHANGED_EVENT;
  63   event.frame_or_window = display_name;
  64   event.arg = arg;
  65   kbd_buffer_store_event (&event);
  66 }
  67
  68 /* Return non-zero if DPYINFO is still valid.  */
  69 static int
  70 dpyinfo_valid (struct x_display_info *dpyinfo)
  71 {
  72   int found = 0;
  73   if (dpyinfo != NULL)
  74     {
  75       struct x_display_info *d;
  76       for (d = x_display_list; !found && d; d = d->next)
  77         found = d == dpyinfo && d->display == dpyinfo->display;
  78     }
  79   return found;
  80 }
  81
  82 /* Store a monospace font change event if the monospaced font changed.  */
  83
  84 #if defined HAVE_XFT && (defined HAVE_GSETTINGS || defined HAVE_GCONF)
  85 static void
  86 store_monospaced_changed (const char *newfont)
  87 {
  88   if (current_mono_font != NULL && strcmp (newfont, current_mono_font) == 0)
  89     return; /* No change. */
  90
  91   xfree (current_mono_font);
  92   current_mono_font = xstrdup (newfont);
  93
  94   if (dpyinfo_valid (first_dpyinfo) && use_system_font)
  95     {
  96       store_config_changed_event (Qmonospace_font_name,
  97                                   XCAR (first_dpyinfo->name_list_element));
  98     }
  99 }
 100 #endif
 101
 102 /* Store a font name change event if the font name changed.  */
 103
 104 #ifdef HAVE_XFT
 105 static void
 106 store_font_name_changed (const char *newfont)
 107 {
 108   if (current_font != NULL && strcmp (newfont, current_font) == 0)
 109     return; /* No change. */
 110
 111   xfree (current_font);
 112   current_font = xstrdup (newfont);
 113
 114   if (dpyinfo_valid (first_dpyinfo))
 115     {
 116       store_config_changed_event (Qfont_name,
 117                                   XCAR (first_dpyinfo->name_list_element));
 118     }
 119 }
 120 #endif /* HAVE_XFT */
 121
 122 /* Map TOOL_BAR_STYLE from a string to its corresponding Lisp value.
 123    Return Qnil if TOOL_BAR_STYLE is not known.  */
 124
 125 static Lisp_Object
 126 map_tool_bar_style (const char *tool_bar_style)
 127 {
 128   Lisp_Object style = Qnil;
 129   if (tool_bar_style)
 130     {
 131       if (strcmp (tool_bar_style, "both") == 0)
 132         style = Qboth;
 133       else if (strcmp (tool_bar_style, "both-horiz") == 0)
 134         style = Qboth_horiz;
 135       else if (strcmp (tool_bar_style, "icons") == 0)
 136         style = Qimage;
 137       else if (strcmp (tool_bar_style, "text") == 0)
 138         style = Qtext;
 139     }
 140
 141   return style;
 142 }
 143
 144 /* Store a tool bar style change event if the tool bar style changed.  */
 145
 146 static void
 147 store_tool_bar_style_changed (const char *newstyle,
 148                               struct x_display_info *dpyinfo)
 149 {
 150   Lisp_Object style = map_tool_bar_style (newstyle);
 151   if (EQ (current_tool_bar_style, style))
 152     return; /* No change. */
 153
 154   current_tool_bar_style = style;
 155   if (dpyinfo_valid (dpyinfo))
 156     store_config_changed_event (Qtool_bar_style,
 157                                 XCAR (dpyinfo->name_list_element));
 158 }
 159
 160 #ifdef HAVE_XFT
 161 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
 162 #endif
 163 #define XSETTINGS_TOOL_BAR_STYLE  "Gtk/ToolbarStyle"
 164
 165 enum {
 166   SEEN_AA         = 0x01,
 167   SEEN_HINTING    = 0x02,
 168   SEEN_RGBA       = 0x04,
 169   SEEN_LCDFILTER  = 0x08,
 170   SEEN_HINTSTYLE  = 0x10,
 171   SEEN_DPI        = 0x20,
 172   SEEN_FONT       = 0x40,
 173   SEEN_TB_STYLE   = 0x80
 174 };
 175 struct xsettings
 176 {
 177 #ifdef HAVE_XFT
 178   FcBool aa, hinting;
 179   int rgba, lcdfilter, hintstyle;
 180   double dpi;
 181
 182   char *font;
 183 #endif
 184
 185   char *tb_style;
 186
 187   unsigned seen;
 188 };
 189
 190 #ifdef HAVE_GSETTINGS
 191 #define GSETTINGS_SCHEMA         "org.gnome.desktop.interface"
 192 #define GSETTINGS_TOOL_BAR_STYLE "toolbar-style"
 193
 194 #ifdef HAVE_XFT
 195 #define GSETTINGS_MONO_FONT  "monospace-font-name"
 196 #define GSETTINGS_FONT_NAME  "font-name"
 197 #endif
 198
 199
 200 /* The single GSettings instance, or NULL if not connected to GSettings.  */
 201
 202 static GSettings *gsettings_client;
 203
 204 /* Callback called when something changed in GSettings.  */
 205
 206 static void
 207 something_changed_gsettingsCB (GSettings *settings,
 208                                gchar *key,
 209                                gpointer user_data)
 210 {
 211   GVariant *val;
 212
 213   if (strcmp (key, GSETTINGS_TOOL_BAR_STYLE) == 0)
 214     {
 215       val = g_settings_get_value (settings, GSETTINGS_TOOL_BAR_STYLE);
 216       if (val)
 217         {
 218           g_variant_ref_sink (val);
 219           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 220             {
 221               const gchar *newstyle = g_variant_get_string (val, NULL);
 222               store_tool_bar_style_changed (newstyle, first_dpyinfo);
 223             }
 224           g_variant_unref (val);
 225         }
 226     }
 227 #ifdef HAVE_XFT
 228   else if (strcmp (key, GSETTINGS_MONO_FONT) == 0)
 229     {
 230       val = g_settings_get_value (settings, GSETTINGS_MONO_FONT);
 231       if (val)
 232         {
 233           g_variant_ref_sink (val);
 234           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 235             {
 236               const gchar *newfont = g_variant_get_string (val, NULL);
 237               store_monospaced_changed (newfont);
 238             }
 239           g_variant_unref (val);
 240         }
 241     }
 242   else if (strcmp (key, GSETTINGS_FONT_NAME) == 0)
 243     {
 244       val = g_settings_get_value (settings, GSETTINGS_FONT_NAME);
 245       if (val)
 246         {
 247           g_variant_ref_sink (val);
 248           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 249             {
 250               const gchar *newfont = g_variant_get_string (val, NULL);
 251               store_font_name_changed (newfont);
 252             }
 253           g_variant_unref (val);
 254         }
 255     }
 256 #endif /* HAVE_XFT */
 257 }
 258
 259 #endif /* HAVE_GSETTINGS */
 260
 261 #ifdef HAVE_GCONF
 262 #define GCONF_TOOL_BAR_STYLE "/desktop/gnome/interface/toolbar_style"
 263 #ifdef HAVE_XFT
 264 #define GCONF_MONO_FONT  "/desktop/gnome/interface/monospace_font_name"
 265 #define GCONF_FONT_NAME  "/desktop/gnome/interface/font_name"
 266 #endif
 267
 268 /* The single GConf instance, or NULL if not connected to GConf.  */
 269
 270 static GConfClient *gconf_client;
 271
 272 /* Callback called when something changed in GConf that we care about.  */
 273
 274 static void
 275 something_changed_gconfCB (GConfClient *client,
 276                            guint cnxn_id,
 277                            GConfEntry *entry,
 278                            gpointer user_data)
 279 {
 280   GConfValue *v = gconf_entry_get_value (entry);
 281   const char *key = gconf_entry_get_key (entry);
 282
 283   if (!v || v->type != GCONF_VALUE_STRING || ! key) return;
 284   if (strcmp (key, GCONF_TOOL_BAR_STYLE) == 0)
 285     {
 286       const char *value = gconf_value_get_string (v);
 287       store_tool_bar_style_changed (value, first_dpyinfo);
 288     }
 289 #ifdef HAVE_XFT
 290   else if (strcmp (key, GCONF_MONO_FONT) == 0)
 291     {
 292       const char *value = gconf_value_get_string (v);
 293       store_monospaced_changed (value);
 294     }
 295   else if (strcmp (key, GCONF_FONT_NAME) == 0)
 296     {
 297       const char *value = gconf_value_get_string (v);
 298       store_font_name_changed (value);
 299     }
 300 #endif /* HAVE_XFT */
 301 }
 302
 303 #endif /* HAVE_GCONF */
 304
 305 #ifdef HAVE_XFT
 306
 307 /* Older fontconfig versions don't have FC_LCD_*.  */
 308 #ifndef FC_LCD_NONE
 309 #define FC_LCD_NONE 0
 310 #endif
 311 #ifndef FC_LCD_DEFAULT
 312 #define FC_LCD_DEFAULT 1
 313 #endif
 314 #ifndef FC_LCD_FILTER
 315 #define FC_LCD_FILTER "lcdfilter"
 316 #endif
 317
 318 #endif /* HAVE_XFT */
 319
 320 /* Find the window that contains the XSETTINGS property values.  */
 321
 322 static void
 323 get_prop_window (struct x_display_info *dpyinfo)
 324 {
 325   Display *dpy = dpyinfo->display;
 326
 327   XGrabServer (dpy);
 328   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 329                                                   dpyinfo->Xatom_xsettings_sel);
 330   if (dpyinfo->xsettings_window != None)
 331     /* Select events so we can detect if window is deleted or if settings
 332        are changed.  */
 333     XSelectInput (dpy, dpyinfo->xsettings_window,
 334                   PropertyChangeMask|StructureNotifyMask);
 335
 336   XUngrabServer (dpy);
 337 }
 338
 339 #define PAD(nr)    (((nr) + 3) & ~3)
 340
 341 /* Parse xsettings and extract those that deal with Xft.
 342    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 343    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 344
 345    Layout of prop.  First is a header:
 346
 347    bytes   type     what
 348    ------------------------------------
 349    1      CARD8    byte-order
 350    3               unused
 351    4      CARD32   SERIAL
 352    4      CARD32   N_SETTINGS
 353
 354    Then N_SETTINGS records, with header:
 355
 356    bytes   type          what
 357    ------------------------------------
 358    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 359    1                    unused
 360    2      CARD16        n == name-length
 361    n      STRING8       name
 362    p                    unused, p=pad_to_even_4(n)
 363    4      CARD32        last-change-serial
 364
 365    and then the value, For string:
 366
 367    bytes   type          what
 368    ------------------------------------
 369    4      CARD32        n = value-length
 370    n      STRING8       value
 371    p                    unused, p=pad_to_even_4(n)
 372
 373    For integer:
 374
 375    bytes   type          what
 376    ------------------------------------
 377    4      INT32         value
 378
 379    For RGB color:
 380
 381    bytes   type          what
 382    ------------------------------------
 383    2      CARD16        red
 384    2      CARD16        blue
 385    2      CARD16        green
 386    2      CARD16        alpha
 387
 388    Returns non-zero if some Xft settings was seen, zero otherwise.
 389 */
 390
 391 static int
 392 parse_settings (unsigned char *prop,
 393                 long unsigned int bytes,
 394                 struct xsettings *settings)
 395 {
 396   Lisp_Object byteorder = Fbyteorder ();
 397   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 398   int that_bo = prop[0];
 399   CARD32 n_settings;
 400   int bytes_parsed = 0;
 401   int settings_seen = 0;
 402   int i = 0;
 403
 404   /* First 4 bytes is a serial number, skip that.  */
 405
 406   if (bytes < 12) return BadLength;
 407   memcpy (&n_settings, prop+8, 4);
 408   if (my_bo != that_bo) n_settings = swap32 (n_settings);
 409   bytes_parsed = 12;
 410
 411   memset (settings, 0, sizeof (*settings));
 412
 413   while (bytes_parsed+4 < bytes && settings_seen < 7
 414          && i < n_settings)
 415     {
 416       int type = prop[bytes_parsed++];
 417       CARD16 nlen;
 418       CARD32 vlen, ival = 0;
 419       char name[128]; /* The names we are looking for are not this long.  */
 420       char sval[128]; /* The values we are looking for are not this long.  */
 421       int want_this;
 422       int to_cpy;
 423
 424       sval[0] = '\0';
 425       ++i;
 426       ++bytes_parsed; /* Padding */
 427
 428       memcpy (&nlen, prop+bytes_parsed, 2);
 429       bytes_parsed += 2;
 430       if (my_bo != that_bo) nlen = swap16 (nlen);
 431       if (bytes_parsed+nlen > bytes) return BadLength;
 432       to_cpy = nlen > 127 ? 127 : nlen;
 433       memcpy (name, prop+bytes_parsed, to_cpy);
 434       name[to_cpy] = '\0';
 435
 436       bytes_parsed += nlen;
 437       bytes_parsed = PAD (bytes_parsed);
 438
 439       bytes_parsed += 4; /* Skip serial for this value */
 440       if (bytes_parsed > bytes) return BadLength;
 441
 442       want_this =
 443 #ifdef HAVE_XFT
 444         (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
 445         || strcmp (XSETTINGS_FONT_NAME, name) == 0
 446         ||
 447 #endif
 448         strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0;
 449
 450       switch (type)
 451         {
 452         case 0: /* Integer */
 453           if (bytes_parsed+4 > bytes) return BadLength;
 454           if (want_this)
 455             {
 456               memcpy (&ival, prop+bytes_parsed, 4);
 457               if (my_bo != that_bo) ival = swap32 (ival);
 458             }
 459           bytes_parsed += 4;
 460           break;
 461
 462         case 1: /* String */
 463           if (bytes_parsed+4 > bytes) return BadLength;
 464           memcpy (&vlen, prop+bytes_parsed, 4);
 465           bytes_parsed += 4;
 466           if (my_bo != that_bo) vlen = swap32 (vlen);
 467           if (want_this)
 468             {
 469               to_cpy = vlen > 127 ? 127 : vlen;
 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 BadLength;
 480           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 481           break;
 482
 483         default: /* Parse Error */
 484           return BadValue;
 485         }
 486
 487       if (want_this)
 488         {
 489           ++settings_seen;
 490           if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 491             {
 492               settings->tb_style = xstrdup (sval);
 493               settings->seen |= SEEN_TB_STYLE;
 494             }
 495 #ifdef HAVE_XFT
 496           else if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 497             {
 498               settings->font = xstrdup (sval);
 499               settings->seen |= SEEN_FONT;
 500             }
 501           else if (strcmp (name, "Xft/Antialias") == 0)
 502             {
 503               settings->seen |= SEEN_AA;
 504               settings->aa = ival != 0;
 505             }
 506           else if (strcmp (name, "Xft/Hinting") == 0)
 507             {
 508               settings->seen |= SEEN_HINTING;
 509               settings->hinting = ival != 0;
 510             }
 511 # ifdef FC_HINT_STYLE
 512           else if (strcmp (name, "Xft/HintStyle") == 0)
 513             {
 514               settings->seen |= SEEN_HINTSTYLE;
 515               if (strcmp (sval, "hintnone") == 0)
 516                 settings->hintstyle = FC_HINT_NONE;
 517               else if (strcmp (sval, "hintslight") == 0)
 518                 settings->hintstyle = FC_HINT_SLIGHT;
 519               else if (strcmp (sval, "hintmedium") == 0)
 520                 settings->hintstyle = FC_HINT_MEDIUM;
 521               else if (strcmp (sval, "hintfull") == 0)
 522                 settings->hintstyle = FC_HINT_FULL;
 523               else
 524                 settings->seen &= ~SEEN_HINTSTYLE;
 525             }
 526 # endif
 527           else if (strcmp (name, "Xft/RGBA") == 0)
 528             {
 529               settings->seen |= SEEN_RGBA;
 530               if (strcmp (sval, "none") == 0)
 531                 settings->rgba = FC_RGBA_NONE;
 532               else if (strcmp (sval, "rgb") == 0)
 533                 settings->rgba = FC_RGBA_RGB;
 534               else if (strcmp (sval, "bgr") == 0)
 535                 settings->rgba = FC_RGBA_BGR;
 536               else if (strcmp (sval, "vrgb") == 0)
 537                 settings->rgba = FC_RGBA_VRGB;
 538               else if (strcmp (sval, "vbgr") == 0)
 539                 settings->rgba = FC_RGBA_VBGR;
 540               else
 541                 settings->seen &= ~SEEN_RGBA;
 542             }
 543           else if (strcmp (name, "Xft/DPI") == 0)
 544             {
 545               settings->seen |= SEEN_DPI;
 546               settings->dpi = (double)ival/1024.0;
 547             }
 548           else if (strcmp (name, "Xft/lcdfilter") == 0)
 549             {
 550               settings->seen |= SEEN_LCDFILTER;
 551               if (strcmp (sval, "none") == 0)
 552                 settings->lcdfilter = FC_LCD_NONE;
 553               else if (strcmp (sval, "lcddefault") == 0)
 554                 settings->lcdfilter = FC_LCD_DEFAULT;
 555               else
 556                 settings->seen &= ~SEEN_LCDFILTER;
 557             }
 558 #endif /* HAVE_XFT */
 559         }
 560     }
 561
 562   return settings_seen;
 563 }
 564
 565 /* Read settings from the XSettings property window on display for DPYINFO.
 566    Store settings read in SETTINGS.
 567    Return non-zero if successful, zero if not.  */
 568
 569 static int
 570 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
 571 {
 572   Atom act_type;
 573   int act_form;
 574   unsigned long nitems, bytes_after;
 575   unsigned char *prop = NULL;
 576   Display *dpy = dpyinfo->display;
 577   int rc;
 578
 579   x_catch_errors (dpy);
 580   rc = XGetWindowProperty (dpy,
 581                            dpyinfo->xsettings_window,
 582                            dpyinfo->Xatom_xsettings_prop,
 583                            0, LONG_MAX, False, AnyPropertyType,
 584                            &act_type, &act_form, &nitems, &bytes_after,
 585                            &prop);
 586
 587   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 588       && act_type == dpyinfo->Xatom_xsettings_prop)
 589     rc = parse_settings (prop, nitems, settings);
 590
 591   XFree (prop);
 592
 593   x_uncatch_errors ();
 594
 595   return rc != 0;
 596 }
 597
 598 /* Apply Xft settings in SETTINGS to the Xft library.
 599    If SEND_EVENT_P is non-zero store a Lisp event that Xft settings changed.  */
 600
 601 static void
 602 apply_xft_settings (struct x_display_info *dpyinfo,
 603                     int send_event_p,
 604                     struct xsettings *settings)
 605 {
 606 #ifdef HAVE_XFT
 607   FcPattern *pat;
 608   struct xsettings oldsettings;
 609   int changed = 0;
 610
 611   memset (&oldsettings, 0, sizeof (oldsettings));
 612   pat = FcPatternCreate ();
 613   XftDefaultSubstitute (dpyinfo->display,
 614                         XScreenNumberOfScreen (dpyinfo->screen),
 615                         pat);
 616   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
 617   FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
 618 #ifdef FC_HINT_STYLE
 619   FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
 620 #endif
 621   FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
 622   FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
 623   FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
 624
 625   if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
 626     {
 627       FcPatternDel (pat, FC_ANTIALIAS);
 628       FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
 629       ++changed;
 630       oldsettings.aa = settings->aa;
 631     }
 632
 633   if ((settings->seen & SEEN_HINTING) != 0
 634       && oldsettings.hinting != settings->hinting)
 635     {
 636       FcPatternDel (pat, FC_HINTING);
 637       FcPatternAddBool (pat, FC_HINTING, settings->hinting);
 638       ++changed;
 639       oldsettings.hinting = settings->hinting;
 640     }
 641   if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
 642     {
 643       FcPatternDel (pat, FC_RGBA);
 644       FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
 645       oldsettings.rgba = settings->rgba;
 646       ++changed;
 647     }
 648
 649   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 650   if ((settings->seen & SEEN_LCDFILTER) != 0
 651       && oldsettings.lcdfilter != settings->lcdfilter)
 652     {
 653       FcPatternDel (pat, FC_LCD_FILTER);
 654       FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
 655       ++changed;
 656       oldsettings.lcdfilter = settings->lcdfilter;
 657     }
 658
 659 #ifdef FC_HINT_STYLE
 660   if ((settings->seen & SEEN_HINTSTYLE) != 0
 661       && oldsettings.hintstyle != settings->hintstyle)
 662     {
 663       FcPatternDel (pat, FC_HINT_STYLE);
 664       FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
 665       ++changed;
 666       oldsettings.hintstyle = settings->hintstyle;
 667     }
 668 #endif
 669
 670   if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
 671       && settings->dpi > 0)
 672     {
 673       FcPatternDel (pat, FC_DPI);
 674       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 675       ++changed;
 676       oldsettings.dpi = settings->dpi;
 677
 678       /* Changing the DPI on this display affects all frames on it.
 679          Check FRAME_RES_X and FRAME_RES_Y in frame.h to see how.  */
 680       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 681     }
 682
 683   if (changed)
 684     {
 685       static char const format[] =
 686         "Antialias: %d, Hinting: %d, RGBA: %d, LCDFilter: %d, "
 687         "Hintstyle: %d, DPI: %f";
 688       enum
 689       {
 690         d_formats = 5,
 691         d_growth = INT_BUFSIZE_BOUND (int) - sizeof "%d",
 692         lf_formats = 1,
 693         max_f_integer_digits = DBL_MAX_10_EXP + 1,
 694         f_precision = 6,
 695         lf_growth = (sizeof "-." + max_f_integer_digits + f_precision
 696                      - sizeof "%f")
 697       };
 698       char buf[sizeof format + d_formats * d_growth + lf_formats * lf_growth];
 699
 700       XftDefaultSet (dpyinfo->display, pat);
 701       if (send_event_p)
 702         store_config_changed_event (Qfont_render,
 703                                     XCAR (dpyinfo->name_list_element));
 704       Vxft_settings
 705         = make_formatted_string (buf, format,
 706                                  oldsettings.aa, oldsettings.hinting,
 707                                  oldsettings.rgba, oldsettings.lcdfilter,
 708                                  oldsettings.hintstyle, oldsettings.dpi);
 709
 710     }
 711   else
 712     FcPatternDestroy (pat);
 713 #endif /* HAVE_XFT */
 714 }
 715
 716 /* Read XSettings from the display for DPYINFO.
 717    If SEND_EVENT_P is non-zero store a Lisp event settings that changed.  */
 718
 719 static void
 720 read_and_apply_settings (struct x_display_info *dpyinfo, int send_event_p)
 721 {
 722   struct xsettings settings;
 723
 724   if (!read_settings (dpyinfo, &settings))
 725     return;
 726
 727   apply_xft_settings (dpyinfo, True, &settings);
 728   if (settings.seen & SEEN_TB_STYLE)
 729     {
 730       if (send_event_p)
 731         store_tool_bar_style_changed (settings.tb_style, dpyinfo);
 732       else
 733         current_tool_bar_style = map_tool_bar_style (settings.tb_style);
 734       xfree (settings.tb_style);
 735     }
 736 #ifdef HAVE_XFT
 737   if (settings.seen & SEEN_FONT)
 738     {
 739       if (send_event_p)
 740         store_font_name_changed (settings.font);
 741       else
 742         {
 743           xfree (current_font);
 744           current_font = xstrdup (settings.font);
 745         }
 746       xfree (settings.font);
 747     }
 748 #endif
 749 }
 750
 751 /* Check if EVENT for the display in DPYINFO is XSettings related.  */
 752
 753 void
 754 xft_settings_event (struct x_display_info *dpyinfo, const XEvent *event)
 755 {
 756   bool check_window_p = 0, apply_settings_p = 0;
 757
 758   switch (event->type)
 759     {
 760     case DestroyNotify:
 761       if (dpyinfo->xsettings_window == event->xany.window)
 762         check_window_p = 1;
 763       break;
 764
 765     case ClientMessage:
 766       if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
 767           && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
 768           && event->xclient.window == dpyinfo->root_window)
 769         check_window_p = 1;
 770       break;
 771
 772     case PropertyNotify:
 773       if (event->xproperty.window == dpyinfo->xsettings_window
 774           && event->xproperty.state == PropertyNewValue
 775           && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
 776         apply_settings_p = 1;
 777       break;
 778     }
 779
 780
 781   if (check_window_p)
 782     {
 783       dpyinfo->xsettings_window = None;
 784       get_prop_window (dpyinfo);
 785       if (dpyinfo->xsettings_window != None)
 786         apply_settings_p = 1;
 787     }
 788
 789   if (apply_settings_p)
 790     read_and_apply_settings (dpyinfo, True);
 791 }
 792
 793 /* Initialize GSettings and read startup values.  */
 794
 795 static void
 796 init_gsettings (void)
 797 {
 798 #ifdef HAVE_GSETTINGS
 799   GVariant *val;
 800   const gchar *const *schemas;
 801   int schema_found = 0;
 802
 803 #if ! GLIB_CHECK_VERSION (2, 36, 0)
 804   g_type_init ();
 805 #endif
 806
 807   schemas = g_settings_list_schemas ();
 808   if (schemas == NULL) return;
 809   while (! schema_found && *schemas != NULL)
 810     schema_found = strcmp (*schemas++, GSETTINGS_SCHEMA) == 0;
 811   if (!schema_found) return;
 812
 813   gsettings_client = g_settings_new (GSETTINGS_SCHEMA);
 814   if (!gsettings_client) return;
 815   g_object_ref_sink (G_OBJECT (gsettings_client));
 816   g_signal_connect (G_OBJECT (gsettings_client), "changed",
 817                     G_CALLBACK (something_changed_gsettingsCB), NULL);
 818
 819   val = g_settings_get_value (gsettings_client, GSETTINGS_TOOL_BAR_STYLE);
 820   if (val)
 821     {
 822       g_variant_ref_sink (val);
 823       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 824         current_tool_bar_style
 825           = map_tool_bar_style (g_variant_get_string (val, NULL));
 826       g_variant_unref (val);
 827     }
 828
 829 #ifdef HAVE_XFT
 830   val = g_settings_get_value (gsettings_client, GSETTINGS_MONO_FONT);
 831   if (val)
 832     {
 833       g_variant_ref_sink (val);
 834       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 835         current_mono_font = xstrdup (g_variant_get_string (val, NULL));
 836       g_variant_unref (val);
 837     }
 838
 839   val = g_settings_get_value (gsettings_client, GSETTINGS_FONT_NAME);
 840   if (val)
 841     {
 842       g_variant_ref_sink (val);
 843       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 844         current_font = xstrdup (g_variant_get_string (val, NULL));
 845       g_variant_unref (val);
 846     }
 847 #endif /* HAVE_XFT */
 848
 849 #endif /* HAVE_GSETTINGS */
 850 }
 851
 852 /* Init GConf and read startup values.  */
 853
 854 static void
 855 init_gconf (void)
 856 {
 857 #if defined (HAVE_GCONF)
 858   char *s;
 859
 860 #if ! GLIB_CHECK_VERSION (2, 36, 0)
 861   g_type_init ();
 862 #endif
 863
 864   gconf_client = gconf_client_get_default ();
 865   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 866   gconf_client_add_dir (gconf_client,
 867                         GCONF_TOOL_BAR_STYLE,
 868                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 869                         NULL);
 870   gconf_client_notify_add (gconf_client,
 871                            GCONF_TOOL_BAR_STYLE,
 872                            something_changed_gconfCB,
 873                            NULL, NULL, NULL);
 874
 875   s = gconf_client_get_string (gconf_client, GCONF_TOOL_BAR_STYLE, NULL);
 876   if (s)
 877     {
 878       current_tool_bar_style = map_tool_bar_style (s);
 879       g_free (s);
 880     }
 881
 882 #ifdef HAVE_XFT
 883   s = gconf_client_get_string (gconf_client, GCONF_MONO_FONT, NULL);
 884   if (s)
 885     {
 886       current_mono_font = xstrdup (s);
 887       g_free (s);
 888     }
 889   s = gconf_client_get_string (gconf_client, GCONF_FONT_NAME, NULL);
 890   if (s)
 891     {
 892       current_font = xstrdup (s);
 893       g_free (s);
 894     }
 895   gconf_client_add_dir (gconf_client,
 896                         GCONF_MONO_FONT,
 897                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 898                         NULL);
 899   gconf_client_notify_add (gconf_client,
 900                            GCONF_MONO_FONT,
 901                            something_changed_gconfCB,
 902                            NULL, NULL, NULL);
 903   gconf_client_add_dir (gconf_client,
 904                         GCONF_FONT_NAME,
 905                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 906                         NULL);
 907   gconf_client_notify_add (gconf_client,
 908                            GCONF_FONT_NAME,
 909                            something_changed_gconfCB,
 910                            NULL, NULL, NULL);
 911 #endif /* HAVE_XFT */
 912 #endif /* HAVE_GCONF */
 913 }
 914
 915 /* Init Xsettings and read startup values.  */
 916
 917 static void
 918 init_xsettings (struct x_display_info *dpyinfo)
 919 {
 920   Display *dpy = dpyinfo->display;
 921
 922   block_input ();
 923
 924   /* Select events so we can detect client messages sent when selection
 925      owner changes.  */
 926   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 927
 928   get_prop_window (dpyinfo);
 929   if (dpyinfo->xsettings_window != None)
 930     read_and_apply_settings (dpyinfo, False);
 931
 932   unblock_input ();
 933 }
 934
 935 void
 936 xsettings_initialize (struct x_display_info *dpyinfo)
 937 {
 938   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 939   init_gconf ();
 940   init_xsettings (dpyinfo);
 941   init_gsettings ();
 942 }
 943
 944 /* Return the system monospaced font.
 945    May be NULL if not known.  */
 946
 947 const char *
 948 xsettings_get_system_font (void)
 949 {
 950   return current_mono_font;
 951 }
 952
 953 #ifdef USE_LUCID
 954 /* Return the system font.
 955    May be NULL if not known.  */
 956
 957 const char *
 958 xsettings_get_system_normal_font (void)
 959 {
 960   return current_font;
 961 }
 962 #endif
 963
 964 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 965        Sfont_get_system_normal_font,
 966        0, 0, 0,
 967        doc: /* Get the system default application font. */)
 968   (void)
 969 {
 970   return current_font ? build_string (current_font) : Qnil;
 971 }
 972
 973 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 974        0, 0, 0,
 975        doc: /* Get the system default fixed width font. */)
 976   (void)
 977 {
 978   return current_mono_font ? build_string (current_mono_font) : Qnil;
 979 }
 980
 981 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
 982        Stool_bar_get_system_style, 0, 0, 0,
 983        doc: /* Get the system tool bar style.
 984 If no system tool bar style is known, return `tool-bar-style' if set to a
 985 known style.  Otherwise return image.  */)
 986   (void)
 987 {
 988   if (EQ (Vtool_bar_style, Qimage)
 989       || EQ (Vtool_bar_style, Qtext)
 990       || EQ (Vtool_bar_style, Qboth)
 991       || EQ (Vtool_bar_style, Qboth_horiz)
 992       || EQ (Vtool_bar_style, Qtext_image_horiz))
 993     return Vtool_bar_style;
 994   if (!NILP (current_tool_bar_style))
 995     return current_tool_bar_style;
 996   return Qimage;
 997 }
 998
 999 void
1000 syms_of_xsettings (void)
1001 {
1002   current_mono_font = NULL;
1003   current_font = NULL;
1004   first_dpyinfo = NULL;
1005 #ifdef HAVE_GSETTINGS
1006   gsettings_client = NULL;
1007 #endif
1008 #ifdef HAVE_GCONF
1009   gconf_client = NULL;
1010 #endif
1011
1012   DEFSYM (Qmonospace_font_name, "monospace-font-name");
1013   DEFSYM (Qfont_name, "font-name");
1014   DEFSYM (Qfont_render, "font-render");
1015   defsubr (&Sfont_get_system_font);
1016   defsubr (&Sfont_get_system_normal_font);
1017
1018   DEFVAR_BOOL ("font-use-system-font", use_system_font,
1019     doc: /* Non-nil means to apply the system defined font dynamically.
1020 When this is non-nil and the system defined fixed width font changes, we
1021 update frames dynamically.
1022 If this variable is nil, Emacs ignores system font changes.  */);
1023   use_system_font = 0;
1024
1025   DEFVAR_LISP ("xft-settings", Vxft_settings,
1026                doc: /* Font settings applied to Xft.  */);
1027   Vxft_settings = empty_unibyte_string;
1028
1029 #ifdef HAVE_XFT
1030   Fprovide (intern_c_string ("font-render-setting"), Qnil);
1031 #if defined (HAVE_GCONF) || defined (HAVE_GSETTINGS)
1032   Fprovide (intern_c_string ("system-font-setting"), Qnil);
1033 #endif
1034 #endif
1035
1036   current_tool_bar_style = Qnil;
1037   DEFSYM (Qtool_bar_style, "tool-bar-style");
1038   defsubr (&Stool_bar_get_system_style);
1039
1040   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
1041 }