src/xsettings.c

   1 /* Functions for handling font and other changes dynamically.
   2
   3 Copyright (C) 2009-2018 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 (at
  10 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 <https://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 current_tool_bar_style;
  55
  56 /* Store an config changed event in to the event queue.  */
  57
  58 static void
  59 store_config_changed_event (Lisp_Object arg, Lisp_Object display_name)
  60 {
  61   struct input_event event;
  62   EVENT_INIT (event);
  63   event.kind = CONFIG_CHANGED_EVENT;
  64   event.frame_or_window = display_name;
  65   event.arg = arg;
  66   kbd_buffer_store_event (&event);
  67 }
  68
  69 /* Return true if DPYINFO is still valid.  */
  70 static bool
  71 dpyinfo_valid (struct x_display_info *dpyinfo)
  72 {
  73   bool found = false;
  74   if (dpyinfo != NULL)
  75     {
  76       struct x_display_info *d;
  77       for (d = x_display_list; !found && d; d = d->next)
  78         found = d == dpyinfo && d->display == dpyinfo->display;
  79     }
  80   return found;
  81 }
  82
  83 /* Store a monospace font change event if the monospaced font changed.  */
  84
  85 #if defined HAVE_XFT && (defined HAVE_GSETTINGS || defined HAVE_GCONF)
  86 static void
  87 store_monospaced_changed (const char *newfont)
  88 {
  89   if (current_mono_font != NULL && strcmp (newfont, current_mono_font) == 0)
  90     return; /* No change. */
  91
  92   dupstring (&current_mono_font, 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   dupstring (&current_font, newfont);
 112
 113   if (dpyinfo_valid (first_dpyinfo))
 114     {
 115       store_config_changed_event (Qfont_name,
 116                                   XCAR (first_dpyinfo->name_list_element));
 117     }
 118 }
 119 #endif /* HAVE_XFT */
 120
 121 /* Map TOOL_BAR_STYLE from a string to its corresponding Lisp value.
 122    Return Qnil if TOOL_BAR_STYLE is not known.  */
 123
 124 static Lisp_Object
 125 map_tool_bar_style (const char *tool_bar_style)
 126 {
 127   Lisp_Object style = Qnil;
 128   if (tool_bar_style)
 129     {
 130       if (strcmp (tool_bar_style, "both") == 0)
 131         style = Qboth;
 132       else if (strcmp (tool_bar_style, "both-horiz") == 0)
 133         style = Qboth_horiz;
 134       else if (strcmp (tool_bar_style, "icons") == 0)
 135         style = Qimage;
 136       else if (strcmp (tool_bar_style, "text") == 0)
 137         style = Qtext;
 138     }
 139
 140   return style;
 141 }
 142
 143 /* Store a tool bar style change event if the tool bar style changed.  */
 144
 145 static void
 146 store_tool_bar_style_changed (const char *newstyle,
 147                               struct x_display_info *dpyinfo)
 148 {
 149   Lisp_Object style = map_tool_bar_style (newstyle);
 150   if (EQ (current_tool_bar_style, style))
 151     return; /* No change. */
 152
 153   current_tool_bar_style = style;
 154   if (dpyinfo_valid (dpyinfo))
 155     store_config_changed_event (Qtool_bar_style,
 156                                 XCAR (dpyinfo->name_list_element));
 157 }
 158
 159 #ifdef HAVE_XFT
 160 #define XSETTINGS_FONT_NAME       "Gtk/FontName"
 161 #endif
 162 #define XSETTINGS_TOOL_BAR_STYLE  "Gtk/ToolbarStyle"
 163
 164 enum {
 165   SEEN_AA         = 0x01,
 166   SEEN_HINTING    = 0x02,
 167   SEEN_RGBA       = 0x04,
 168   SEEN_LCDFILTER  = 0x08,
 169   SEEN_HINTSTYLE  = 0x10,
 170   SEEN_DPI        = 0x20,
 171   SEEN_FONT       = 0x40,
 172   SEEN_TB_STYLE   = 0x80
 173 };
 174 struct xsettings
 175 {
 176 #ifdef HAVE_XFT
 177   FcBool aa, hinting;
 178   int rgba, lcdfilter, hintstyle;
 179   double dpi;
 180
 181   char *font;
 182 #endif
 183
 184   char *tb_style;
 185
 186   unsigned seen;
 187 };
 188
 189 #ifdef HAVE_GSETTINGS
 190 #define GSETTINGS_SCHEMA         "org.gnome.desktop.interface"
 191 #define GSETTINGS_TOOL_BAR_STYLE "toolbar-style"
 192
 193 #ifdef HAVE_XFT
 194 #define GSETTINGS_MONO_FONT  "monospace-font-name"
 195 #define GSETTINGS_FONT_NAME  "font-name"
 196 #endif
 197
 198
 199 /* The single GSettings instance, or NULL if not connected to GSettings.  */
 200
 201 static GSettings *gsettings_client;
 202
 203 /* Callback called when something changed in GSettings.  */
 204
 205 static void
 206 something_changed_gsettingsCB (GSettings *settings,
 207                                gchar *key,
 208                                gpointer user_data)
 209 {
 210   GVariant *val;
 211
 212   if (strcmp (key, GSETTINGS_TOOL_BAR_STYLE) == 0)
 213     {
 214       val = g_settings_get_value (settings, GSETTINGS_TOOL_BAR_STYLE);
 215       if (val)
 216         {
 217           g_variant_ref_sink (val);
 218           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 219             {
 220               const gchar *newstyle = g_variant_get_string (val, NULL);
 221               store_tool_bar_style_changed (newstyle, first_dpyinfo);
 222             }
 223           g_variant_unref (val);
 224         }
 225     }
 226 #ifdef HAVE_XFT
 227   else if (strcmp (key, GSETTINGS_MONO_FONT) == 0)
 228     {
 229       val = g_settings_get_value (settings, GSETTINGS_MONO_FONT);
 230       if (val)
 231         {
 232           g_variant_ref_sink (val);
 233           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 234             {
 235               const gchar *newfont = g_variant_get_string (val, NULL);
 236               store_monospaced_changed (newfont);
 237             }
 238           g_variant_unref (val);
 239         }
 240     }
 241   else if (strcmp (key, GSETTINGS_FONT_NAME) == 0)
 242     {
 243       val = g_settings_get_value (settings, GSETTINGS_FONT_NAME);
 244       if (val)
 245         {
 246           g_variant_ref_sink (val);
 247           if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 248             {
 249               const gchar *newfont = g_variant_get_string (val, NULL);
 250               store_font_name_changed (newfont);
 251             }
 252           g_variant_unref (val);
 253         }
 254     }
 255 #endif /* HAVE_XFT */
 256 }
 257
 258 #endif /* HAVE_GSETTINGS */
 259
 260 #ifdef HAVE_GCONF
 261 #define GCONF_TOOL_BAR_STYLE "/desktop/gnome/interface/toolbar_style"
 262 #ifdef HAVE_XFT
 263 #define GCONF_MONO_FONT  "/desktop/gnome/interface/monospace_font_name"
 264 #define GCONF_FONT_NAME  "/desktop/gnome/interface/font_name"
 265 #endif
 266
 267 /* The single GConf instance, or NULL if not connected to GConf.  */
 268
 269 static GConfClient *gconf_client;
 270
 271 /* Callback called when something changed in GConf that we care about.  */
 272
 273 static void
 274 something_changed_gconfCB (GConfClient *client,
 275                            guint cnxn_id,
 276                            GConfEntry *entry,
 277                            gpointer user_data)
 278 {
 279   GConfValue *v = gconf_entry_get_value (entry);
 280   const char *key = gconf_entry_get_key (entry);
 281
 282   if (!v || v->type != GCONF_VALUE_STRING || ! key) return;
 283   if (strcmp (key, GCONF_TOOL_BAR_STYLE) == 0)
 284     {
 285       const char *value = gconf_value_get_string (v);
 286       store_tool_bar_style_changed (value, first_dpyinfo);
 287     }
 288 #ifdef HAVE_XFT
 289   else if (strcmp (key, GCONF_MONO_FONT) == 0)
 290     {
 291       const char *value = gconf_value_get_string (v);
 292       store_monospaced_changed (value);
 293     }
 294   else if (strcmp (key, GCONF_FONT_NAME) == 0)
 295     {
 296       const char *value = gconf_value_get_string (v);
 297       store_font_name_changed (value);
 298     }
 299 #endif /* HAVE_XFT */
 300 }
 301
 302 #endif /* HAVE_GCONF */
 303
 304 #ifdef HAVE_XFT
 305
 306 /* Older fontconfig versions don't have FC_LCD_*.  */
 307 #ifndef FC_LCD_NONE
 308 #define FC_LCD_NONE 0
 309 #endif
 310 #ifndef FC_LCD_DEFAULT
 311 #define FC_LCD_DEFAULT 1
 312 #endif
 313 #ifndef FC_LCD_FILTER
 314 #define FC_LCD_FILTER "lcdfilter"
 315 #endif
 316
 317 #endif /* HAVE_XFT */
 318
 319 /* Find the window that contains the XSETTINGS property values.  */
 320
 321 static void
 322 get_prop_window (struct x_display_info *dpyinfo)
 323 {
 324   Display *dpy = dpyinfo->display;
 325
 326   XGrabServer (dpy);
 327   dpyinfo->xsettings_window = XGetSelectionOwner (dpy,
 328                                                   dpyinfo->Xatom_xsettings_sel);
 329   if (dpyinfo->xsettings_window != None)
 330     /* Select events so we can detect if window is deleted or if settings
 331        are changed.  */
 332     XSelectInput (dpy, dpyinfo->xsettings_window,
 333                   PropertyChangeMask|StructureNotifyMask);
 334
 335   XUngrabServer (dpy);
 336 }
 337
 338 #define PAD(nr)    (((nr) + 3) & ~3)
 339
 340 /* Parse xsettings and extract those that deal with Xft.
 341    See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
 342    and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
 343
 344    Layout of prop.  First is a header:
 345
 346    bytes   type     what
 347    ------------------------------------
 348    1      CARD8    byte-order
 349    3               unused
 350    4      CARD32   SERIAL
 351    4      CARD32   N_SETTINGS
 352
 353    Then N_SETTINGS records, with header:
 354
 355    bytes   type          what
 356    ------------------------------------
 357    1      SETTING_TYPE  type (0 = integer, 1 = string, 2 RGB color).
 358    1                    unused
 359    2      CARD16        n == name-length
 360    n      STRING8       name
 361    p                    unused, p=pad_to_even_4(n)
 362    4      CARD32        last-change-serial
 363
 364    and then the value, For string:
 365
 366    bytes   type          what
 367    ------------------------------------
 368    4      CARD32        n = value-length
 369    n      STRING8       value
 370    p                    unused, p=pad_to_even_4(n)
 371
 372    For integer:
 373
 374    bytes   type          what
 375    ------------------------------------
 376    4      INT32         value
 377
 378    For RGB color:
 379
 380    bytes   type          what
 381    ------------------------------------
 382    2      CARD16        red
 383    2      CARD16        blue
 384    2      CARD16        green
 385    2      CARD16        alpha
 386
 387    Returns non-zero if some Xft settings was seen, zero otherwise.
 388 */
 389
 390 static int
 391 parse_settings (unsigned char *prop,
 392                 unsigned long bytes,
 393                 struct xsettings *settings)
 394 {
 395   Lisp_Object byteorder = Fbyteorder ();
 396   int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
 397   int that_bo = prop[0];
 398   CARD32 n_settings;
 399   int bytes_parsed = 0;
 400   int settings_seen = 0;
 401   int i = 0;
 402
 403   /* First 4 bytes is a serial number, skip that.  */
 404
 405   if (bytes < 12) return settings_seen;
 406   memcpy (&n_settings, prop+8, 4);
 407   if (my_bo != that_bo) n_settings = bswap_32 (n_settings);
 408   bytes_parsed = 12;
 409
 410   memset (settings, 0, sizeof (*settings));
 411
 412   while (bytes_parsed+4 < bytes && settings_seen < 7
 413          && i < n_settings)
 414     {
 415       int type = prop[bytes_parsed++];
 416       CARD16 nlen;
 417       CARD32 vlen, ival = 0;
 418       char name[128]; /* The names we are looking for are not this long.  */
 419       char sval[128]; /* The values we are looking for are not this long.  */
 420       bool want_this;
 421       int to_cpy;
 422
 423       sval[0] = '\0';
 424       ++i;
 425       ++bytes_parsed; /* Padding */
 426
 427       memcpy (&nlen, prop+bytes_parsed, 2);
 428       bytes_parsed += 2;
 429       if (my_bo != that_bo) nlen = bswap_16 (nlen);
 430       if (bytes_parsed + nlen > bytes) return settings_seen;
 431       to_cpy = min (nlen, sizeof name - 1);
 432       memcpy (name, prop+bytes_parsed, to_cpy);
 433       name[to_cpy] = '\0';
 434
 435       bytes_parsed += nlen;
 436       bytes_parsed = PAD (bytes_parsed);
 437
 438       bytes_parsed += 4; /* Skip serial for this value */
 439       if (bytes_parsed > bytes) return settings_seen;
 440
 441       want_this = strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0;
 442 #ifdef HAVE_XFT
 443       if ((nlen > 6 && memcmp (name, "Xft/", 4) == 0)
 444           || strcmp (XSETTINGS_FONT_NAME, name) == 0)
 445         want_this = true;
 446 #endif
 447
 448       switch (type)
 449         {
 450         case 0: /* Integer */
 451           if (bytes_parsed + 4 > bytes) return settings_seen;
 452           if (want_this)
 453             {
 454               memcpy (&ival, prop+bytes_parsed, 4);
 455               if (my_bo != that_bo) ival = bswap_32 (ival);
 456             }
 457           bytes_parsed += 4;
 458           break;
 459
 460         case 1: /* String */
 461           if (bytes_parsed + 4 > bytes) return settings_seen;
 462           memcpy (&vlen, prop+bytes_parsed, 4);
 463           bytes_parsed += 4;
 464           if (my_bo != that_bo) vlen = bswap_32 (vlen);
 465           if (want_this)
 466             {
 467               to_cpy = min (vlen, sizeof sval - 1);
 468               memcpy (sval, prop+bytes_parsed, to_cpy);
 469               sval[to_cpy] = '\0';
 470             }
 471           bytes_parsed += vlen;
 472           bytes_parsed = PAD (bytes_parsed);
 473           break;
 474
 475         case 2: /* RGB value */
 476           /* No need to parse this */
 477           if (bytes_parsed + 8 > bytes) return settings_seen;
 478           bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each.  */
 479           break;
 480
 481         default: /* Parse Error */
 482           return settings_seen;
 483         }
 484
 485       if (want_this)
 486         {
 487           if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
 488             {
 489               dupstring (&settings->tb_style, sval);
 490               settings->seen |= SEEN_TB_STYLE;
 491             }
 492 #ifdef HAVE_XFT
 493           else if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
 494             {
 495               dupstring (&settings->font, sval);
 496               settings->seen |= SEEN_FONT;
 497             }
 498           else if (strcmp (name, "Xft/Antialias") == 0)
 499             {
 500               settings->seen |= SEEN_AA;
 501               settings->aa = ival != 0;
 502             }
 503           else if (strcmp (name, "Xft/Hinting") == 0)
 504             {
 505               settings->seen |= SEEN_HINTING;
 506               settings->hinting = ival != 0;
 507             }
 508 # ifdef FC_HINT_STYLE
 509           else if (strcmp (name, "Xft/HintStyle") == 0)
 510             {
 511               settings->seen |= SEEN_HINTSTYLE;
 512               if (strcmp (sval, "hintnone") == 0)
 513                 settings->hintstyle = FC_HINT_NONE;
 514               else if (strcmp (sval, "hintslight") == 0)
 515                 settings->hintstyle = FC_HINT_SLIGHT;
 516               else if (strcmp (sval, "hintmedium") == 0)
 517                 settings->hintstyle = FC_HINT_MEDIUM;
 518               else if (strcmp (sval, "hintfull") == 0)
 519                 settings->hintstyle = FC_HINT_FULL;
 520               else
 521                 settings->seen &= ~SEEN_HINTSTYLE;
 522             }
 523 # endif
 524           else if (strcmp (name, "Xft/RGBA") == 0)
 525             {
 526               settings->seen |= SEEN_RGBA;
 527               if (strcmp (sval, "none") == 0)
 528                 settings->rgba = FC_RGBA_NONE;
 529               else if (strcmp (sval, "rgb") == 0)
 530                 settings->rgba = FC_RGBA_RGB;
 531               else if (strcmp (sval, "bgr") == 0)
 532                 settings->rgba = FC_RGBA_BGR;
 533               else if (strcmp (sval, "vrgb") == 0)
 534                 settings->rgba = FC_RGBA_VRGB;
 535               else if (strcmp (sval, "vbgr") == 0)
 536                 settings->rgba = FC_RGBA_VBGR;
 537               else
 538                 settings->seen &= ~SEEN_RGBA;
 539             }
 540           else if (strcmp (name, "Xft/DPI") == 0 && ival != (CARD32) -1)
 541             {
 542               settings->seen |= SEEN_DPI;
 543               settings->dpi = ival / 1024.0;
 544             }
 545           else if (strcmp (name, "Xft/lcdfilter") == 0)
 546             {
 547               settings->seen |= SEEN_LCDFILTER;
 548               if (strcmp (sval, "none") == 0)
 549                 settings->lcdfilter = FC_LCD_NONE;
 550               else if (strcmp (sval, "lcddefault") == 0)
 551                 settings->lcdfilter = FC_LCD_DEFAULT;
 552               else
 553                 settings->seen &= ~SEEN_LCDFILTER;
 554             }
 555 #endif /* HAVE_XFT */
 556           else
 557             want_this = false;
 558           settings_seen += want_this;
 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 true iff successful.  */
 568
 569 static bool
 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   bool got_settings = false;
 579
 580   x_catch_errors (dpy);
 581   rc = XGetWindowProperty (dpy,
 582                            dpyinfo->xsettings_window,
 583                            dpyinfo->Xatom_xsettings_prop,
 584                            0, LONG_MAX, False, AnyPropertyType,
 585                            &act_type, &act_form, &nitems, &bytes_after,
 586                            &prop);
 587
 588   if (rc == Success && prop != NULL && act_form == 8 && nitems > 0
 589       && act_type == dpyinfo->Xatom_xsettings_prop)
 590     got_settings = parse_settings (prop, nitems, settings) != 0;
 591
 592   XFree (prop);
 593
 594   x_uncatch_errors ();
 595
 596   return got_settings;
 597 }
 598
 599 /* Apply Xft settings in SETTINGS to the Xft library.
 600    Store a Lisp event that Xft settings changed.  */
 601
 602 static void
 603 apply_xft_settings (struct x_display_info *dpyinfo,
 604                     struct xsettings *settings)
 605 {
 606 #ifdef HAVE_XFT
 607   FcPattern *pat;
 608   struct xsettings oldsettings;
 609   bool changed = false;
 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 = true;
 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 = true;
 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 = true;
 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 = true;
 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 = true;
 666       oldsettings.hintstyle = settings->hintstyle;
 667     }
 668 #endif
 669
 670   if ((settings->seen & SEEN_DPI) != 0
 671       && settings->dpi > 0
 672       /* The following conjunct avoids setting `changed' to true when
 673          old and new dpi settings do not differ "substantially".
 674          Otherwise, the dynamic-setting Elisp code may process all sorts
 675          of unrelated settings that override users' font customizations,
 676          among others.  Compare:
 677
 678          https://lists.gnu.org/r/emacs-devel/2016-05/msg00557.html
 679          https://lists.gnu.org/r/bug-gnu-emacs/2016-12/msg00820.html
 680
 681          As soon as the dynamic-settings code has been tested and
 682          verified, this Emacs 25.2 workaround should be removed.  */
 683       && ((oldsettings.dpi >= settings->dpi
 684            && (oldsettings.dpi - settings->dpi) > 2)
 685           || ((settings->dpi > oldsettings.dpi)
 686               && (settings->dpi - oldsettings.dpi) > 2)))
 687     {
 688       FcPatternDel (pat, FC_DPI);
 689       FcPatternAddDouble (pat, FC_DPI, settings->dpi);
 690       changed = true;
 691       oldsettings.dpi = settings->dpi;
 692
 693       /* Changing the DPI on this display affects all frames on it.
 694          Check FRAME_RES_X and FRAME_RES_Y in frame.h to see how.  */
 695       dpyinfo->resy = dpyinfo->resx = settings->dpi;
 696     }
 697
 698   if (changed)
 699     {
 700       static char const format[] =
 701         "Antialias: %d, Hinting: %d, RGBA: %d, LCDFilter: %d, "
 702         "Hintstyle: %d, DPI: %f";
 703       enum
 704       {
 705         d_formats = 5,
 706         d_growth = INT_BUFSIZE_BOUND (int) - sizeof "%d",
 707         lf_formats = 1,
 708         max_f_integer_digits = DBL_MAX_10_EXP + 1,
 709         f_precision = 6,
 710         lf_growth = (sizeof "-." + max_f_integer_digits + f_precision
 711                      - sizeof "%f")
 712       };
 713       char buf[sizeof format + d_formats * d_growth + lf_formats * lf_growth];
 714
 715       XftDefaultSet (dpyinfo->display, pat);
 716       store_config_changed_event (Qfont_render,
 717                                   XCAR (dpyinfo->name_list_element));
 718       Vxft_settings
 719         = make_formatted_string (buf, format,
 720                                  oldsettings.aa, oldsettings.hinting,
 721                                  oldsettings.rgba, oldsettings.lcdfilter,
 722                                  oldsettings.hintstyle, oldsettings.dpi);
 723
 724     }
 725   else
 726     FcPatternDestroy (pat);
 727 #endif /* HAVE_XFT */
 728 }
 729
 730 /* Read XSettings from the display for DPYINFO.
 731    If SEND_EVENT_P store a Lisp event settings that changed.  */
 732
 733 static void
 734 read_and_apply_settings (struct x_display_info *dpyinfo, bool send_event_p)
 735 {
 736   struct xsettings settings;
 737
 738   if (!read_settings (dpyinfo, &settings))
 739     return;
 740
 741   apply_xft_settings (dpyinfo, &settings);
 742   if (settings.seen & SEEN_TB_STYLE)
 743     {
 744       if (send_event_p)
 745         store_tool_bar_style_changed (settings.tb_style, dpyinfo);
 746       else
 747         current_tool_bar_style = map_tool_bar_style (settings.tb_style);
 748       xfree (settings.tb_style);
 749     }
 750 #ifdef HAVE_XFT
 751   if (settings.seen & SEEN_FONT)
 752     {
 753       if (send_event_p)
 754         store_font_name_changed (settings.font);
 755       else
 756         dupstring (&current_font, settings.font);
 757       xfree (settings.font);
 758     }
 759 #endif
 760 }
 761
 762 /* Check if EVENT for the display in DPYINFO is XSettings related.  */
 763
 764 void
 765 xft_settings_event (struct x_display_info *dpyinfo, const XEvent *event)
 766 {
 767   bool check_window_p = false, apply_settings_p = false;
 768
 769   switch (event->type)
 770     {
 771     case DestroyNotify:
 772       if (dpyinfo->xsettings_window == event->xany.window)
 773         check_window_p = true;
 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 = true;
 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_p = true;
 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_p = true;
 798     }
 799
 800   if (apply_settings_p)
 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   bool schema_found = false;
 812
 813 #if ! GLIB_CHECK_VERSION (2, 36, 0)
 814   g_type_init ();
 815 #endif
 816
 817 #if GLIB_CHECK_VERSION (2, 32, 0)
 818   {
 819     GSettingsSchema *sc = g_settings_schema_source_lookup
 820       (g_settings_schema_source_get_default (),
 821        GSETTINGS_SCHEMA,
 822        true);
 823     schema_found = sc != NULL;
 824     if (sc) g_settings_schema_unref (sc);
 825   }
 826 #else
 827   {
 828     const gchar *const *schemas = g_settings_list_schemas ();
 829     if (schemas == NULL) return;
 830     while (! schema_found && *schemas != NULL)
 831       schema_found = strcmp (*schemas++, GSETTINGS_SCHEMA) == 0;
 832   }
 833 #endif
 834   if (!schema_found) return;
 835
 836   gsettings_client = g_settings_new (GSETTINGS_SCHEMA);
 837   if (!gsettings_client) return;
 838   g_object_ref_sink (G_OBJECT (gsettings_client));
 839   g_signal_connect (G_OBJECT (gsettings_client), "changed",
 840                     G_CALLBACK (something_changed_gsettingsCB), NULL);
 841
 842   val = g_settings_get_value (gsettings_client, GSETTINGS_TOOL_BAR_STYLE);
 843   if (val)
 844     {
 845       g_variant_ref_sink (val);
 846       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 847         current_tool_bar_style
 848           = map_tool_bar_style (g_variant_get_string (val, NULL));
 849       g_variant_unref (val);
 850     }
 851
 852 #ifdef HAVE_XFT
 853   val = g_settings_get_value (gsettings_client, GSETTINGS_MONO_FONT);
 854   if (val)
 855     {
 856       g_variant_ref_sink (val);
 857       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 858         dupstring (&current_mono_font, g_variant_get_string (val, NULL));
 859       g_variant_unref (val);
 860     }
 861
 862   val = g_settings_get_value (gsettings_client, GSETTINGS_FONT_NAME);
 863   if (val)
 864     {
 865       g_variant_ref_sink (val);
 866       if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
 867         dupstring (&current_font, g_variant_get_string (val, NULL));
 868       g_variant_unref (val);
 869     }
 870 #endif /* HAVE_XFT */
 871
 872 #endif /* HAVE_GSETTINGS */
 873 }
 874
 875 /* Init GConf and read startup values.  */
 876
 877 static void
 878 init_gconf (void)
 879 {
 880 #if defined (HAVE_GCONF)
 881   char *s;
 882
 883 #if ! GLIB_CHECK_VERSION (2, 36, 0)
 884   g_type_init ();
 885 #endif
 886
 887   gconf_client = gconf_client_get_default ();
 888   gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
 889   gconf_client_add_dir (gconf_client,
 890                         GCONF_TOOL_BAR_STYLE,
 891                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 892                         NULL);
 893   gconf_client_notify_add (gconf_client,
 894                            GCONF_TOOL_BAR_STYLE,
 895                            something_changed_gconfCB,
 896                            NULL, NULL, NULL);
 897
 898   s = gconf_client_get_string (gconf_client, GCONF_TOOL_BAR_STYLE, NULL);
 899   if (s)
 900     {
 901       current_tool_bar_style = map_tool_bar_style (s);
 902       g_free (s);
 903     }
 904
 905 #ifdef HAVE_XFT
 906   s = gconf_client_get_string (gconf_client, GCONF_MONO_FONT, NULL);
 907   if (s)
 908     {
 909       dupstring (&current_mono_font, s);
 910       g_free (s);
 911     }
 912   s = gconf_client_get_string (gconf_client, GCONF_FONT_NAME, NULL);
 913   if (s)
 914     {
 915       dupstring (&current_font, s);
 916       g_free (s);
 917     }
 918   gconf_client_add_dir (gconf_client,
 919                         GCONF_MONO_FONT,
 920                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 921                         NULL);
 922   gconf_client_notify_add (gconf_client,
 923                            GCONF_MONO_FONT,
 924                            something_changed_gconfCB,
 925                            NULL, NULL, NULL);
 926   gconf_client_add_dir (gconf_client,
 927                         GCONF_FONT_NAME,
 928                         GCONF_CLIENT_PRELOAD_ONELEVEL,
 929                         NULL);
 930   gconf_client_notify_add (gconf_client,
 931                            GCONF_FONT_NAME,
 932                            something_changed_gconfCB,
 933                            NULL, NULL, NULL);
 934 #endif /* HAVE_XFT */
 935 #endif /* HAVE_GCONF */
 936 }
 937
 938 /* Init Xsettings and read startup values.  */
 939
 940 static void
 941 init_xsettings (struct x_display_info *dpyinfo)
 942 {
 943   Display *dpy = dpyinfo->display;
 944
 945   block_input ();
 946
 947   /* Select events so we can detect client messages sent when selection
 948      owner changes.  */
 949   XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
 950
 951   get_prop_window (dpyinfo);
 952   if (dpyinfo->xsettings_window != None)
 953     read_and_apply_settings (dpyinfo, false);
 954
 955   unblock_input ();
 956 }
 957
 958 void
 959 xsettings_initialize (struct x_display_info *dpyinfo)
 960 {
 961   if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
 962   init_gconf ();
 963   init_xsettings (dpyinfo);
 964   init_gsettings ();
 965 }
 966
 967 /* Return the system monospaced font.
 968    May be NULL if not known.  */
 969
 970 const char *
 971 xsettings_get_system_font (void)
 972 {
 973   return current_mono_font;
 974 }
 975
 976 #ifdef USE_LUCID
 977 /* Return the system font.
 978    May be NULL if not known.  */
 979
 980 const char *
 981 xsettings_get_system_normal_font (void)
 982 {
 983   return current_font;
 984 }
 985 #endif
 986
 987 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
 988        Sfont_get_system_normal_font,
 989        0, 0, 0,
 990        doc: /* Get the system default application font. */)
 991   (void)
 992 {
 993   return current_font ? build_string (current_font) : Qnil;
 994 }
 995
 996 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
 997        0, 0, 0,
 998        doc: /* Get the system default fixed width font. */)
 999   (void)
1000 {
1001   return current_mono_font ? build_string (current_mono_font) : Qnil;
1002 }
1003
1004 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
1005        Stool_bar_get_system_style, 0, 0, 0,
1006        doc: /* Get the system tool bar style.
1007 If no system tool bar style is known, return `tool-bar-style' if set to a
1008 known style.  Otherwise return image.  */)
1009   (void)
1010 {
1011   if (EQ (Vtool_bar_style, Qimage)
1012       || EQ (Vtool_bar_style, Qtext)
1013       || EQ (Vtool_bar_style, Qboth)
1014       || EQ (Vtool_bar_style, Qboth_horiz)
1015       || EQ (Vtool_bar_style, Qtext_image_horiz))
1016     return Vtool_bar_style;
1017   if (!NILP (current_tool_bar_style))
1018     return current_tool_bar_style;
1019   return Qimage;
1020 }
1021
1022 void
1023 syms_of_xsettings (void)
1024 {
1025   current_mono_font = NULL;
1026   current_font = NULL;
1027   first_dpyinfo = NULL;
1028 #ifdef HAVE_GSETTINGS
1029   gsettings_client = NULL;
1030 #endif
1031 #ifdef HAVE_GCONF
1032   gconf_client = NULL;
1033 #endif
1034
1035   DEFSYM (Qmonospace_font_name, "monospace-font-name");
1036   DEFSYM (Qfont_name, "font-name");
1037   DEFSYM (Qfont_render, "font-render");
1038   defsubr (&Sfont_get_system_font);
1039   defsubr (&Sfont_get_system_normal_font);
1040
1041   DEFVAR_BOOL ("font-use-system-font", use_system_font,
1042     doc: /* Non-nil means to apply the system defined font dynamically.
1043 When this is non-nil and the system defined fixed width font changes, we
1044 update frames dynamically.
1045 If this variable is nil, Emacs ignores system font changes.  */);
1046   use_system_font = false;
1047
1048   DEFVAR_LISP ("xft-settings", Vxft_settings,
1049                doc: /* Font settings applied to Xft.  */);
1050   Vxft_settings = empty_unibyte_string;
1051
1052 #ifdef HAVE_XFT
1053   Fprovide (intern_c_string ("font-render-setting"), Qnil);
1054 #if defined (HAVE_GCONF) || defined (HAVE_GSETTINGS)
1055   Fprovide (intern_c_string ("system-font-setting"), Qnil);
1056 #endif
1057 #endif
1058
1059   current_tool_bar_style = Qnil;
1060   DEFSYM (Qtool_bar_style, "tool-bar-style");
1061   defsubr (&Stool_bar_get_system_style);
1062
1063   Fprovide (intern_c_string ("dynamic-setting"), Qnil);
1064 }