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Support filesystem notification through inotify on GNU/Linux.
[emacs.git] / src / xsettings.c
blobd23070791d8f3df5bd64d2dac56b87fa18af1423
1 /* Functions for handling font and other changes dynamically.
2
3 Copyright (C) 2009-2012 Free Software Foundation, Inc.
4
5 This file is part of GNU Emacs.
6
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
11
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include <config.h>
21
22 #include <float.h>
23 #include <limits.h>
24 #include <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 SWAP32(nr) (((nr) << 24) | (((nr) << 8) & 0xff0000) \
340 | (((nr) >> 8) & 0xff00) | ((nr) >> 24))
341 #define SWAP16(nr) (((nr) << 8) | ((nr) >> 8))
342 #define PAD(nr) (((nr) + 3) & ~3)
343
344 /* Parse xsettings and extract those that deal with Xft.
345 See http://freedesktop.org/wiki/Specifications/XSettingsRegistry
346 and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html.
347
348 Layout of prop. First is a header:
349
350 bytes type what
351 ------------------------------------
352 1 CARD8 byte-order
353 3 unused
354 4 CARD32 SERIAL
355 4 CARD32 N_SETTINGS
356
357 Then N_SETTINGS records, with header:
358
359 bytes type what
360 ------------------------------------
361 1 SETTING_TYPE type (0 = integer, 1 = string, 2 RGB color).
362 1 unused
363 2 CARD16 n == name-length
364 n STRING8 name
365 p unused, p=pad_to_even_4(n)
366 4 CARD32 last-change-serial
367
368 and then the value, For string:
369
370 bytes type what
371 ------------------------------------
372 4 CARD32 n = value-length
373 n STRING8 value
374 p unused, p=pad_to_even_4(n)
375
376 For integer:
377
378 bytes type what
379 ------------------------------------
380 4 INT32 value
381
382 For RGB color:
383
384 bytes type what
385 ------------------------------------
386 2 CARD16 red
387 2 CARD16 blue
388 2 CARD16 green
389 2 CARD16 alpha
390
391 Returns non-zero if some Xft settings was seen, zero otherwise.
392 */
393
394 static int
395 parse_settings (unsigned char *prop,
396 long unsigned int bytes,
397 struct xsettings *settings)
398 {
399 Lisp_Object byteorder = Fbyteorder ();
400 int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst;
401 int that_bo = prop[0];
402 CARD32 n_settings;
403 int bytes_parsed = 0;
404 int settings_seen = 0;
405 int i = 0;
406
407 /* First 4 bytes is a serial number, skip that. */
408
409 if (bytes < 12) return BadLength;
410 memcpy (&n_settings, prop+8, 4);
411 if (my_bo != that_bo) n_settings = SWAP32 (n_settings);
412 bytes_parsed = 12;
413
414 memset (settings, 0, sizeof (*settings));
415
416 while (bytes_parsed+4 < bytes && settings_seen < 7
417 && i < n_settings)
418 {
419 int type = prop[bytes_parsed++];
420 CARD16 nlen;
421 CARD32 vlen, ival = 0;
422 char name[128]; /* The names we are looking for are not this long. */
423 char sval[128]; /* The values we are looking for are not this long. */
424 int want_this;
425 int to_cpy;
426
427 sval[0] = '\0';
428 ++i;
429 ++bytes_parsed; /* Padding */
430
431 memcpy (&nlen, prop+bytes_parsed, 2);
432 bytes_parsed += 2;
433 if (my_bo != that_bo) nlen = SWAP16 (nlen);
434 if (bytes_parsed+nlen > bytes) return BadLength;
435 to_cpy = nlen > 127 ? 127 : nlen;
436 memcpy (name, prop+bytes_parsed, to_cpy);
437 name[to_cpy] = '\0';
438
439 bytes_parsed += nlen;
440 bytes_parsed = PAD (bytes_parsed);
441
442 bytes_parsed += 4; /* Skip serial for this value */
443 if (bytes_parsed > bytes) return BadLength;
444
445 want_this =
446 #ifdef HAVE_XFT
447 (nlen > 6 && strncmp (name, "Xft/", 4) == 0)
448 || strcmp (XSETTINGS_FONT_NAME, name) == 0
449 ||
450 #endif
451 strcmp (XSETTINGS_TOOL_BAR_STYLE, name) == 0;
452
453 switch (type)
454 {
455 case 0: /* Integer */
456 if (bytes_parsed+4 > bytes) return BadLength;
457 if (want_this)
458 {
459 memcpy (&ival, prop+bytes_parsed, 4);
460 if (my_bo != that_bo) ival = SWAP32 (ival);
461 }
462 bytes_parsed += 4;
463 break;
464
465 case 1: /* String */
466 if (bytes_parsed+4 > bytes) return BadLength;
467 memcpy (&vlen, prop+bytes_parsed, 4);
468 bytes_parsed += 4;
469 if (my_bo != that_bo) vlen = SWAP32 (vlen);
470 if (want_this)
471 {
472 to_cpy = vlen > 127 ? 127 : vlen;
473 memcpy (sval, prop+bytes_parsed, to_cpy);
474 sval[to_cpy] = '\0';
475 }
476 bytes_parsed += vlen;
477 bytes_parsed = PAD (bytes_parsed);
478 break;
479
480 case 2: /* RGB value */
481 /* No need to parse this */
482 if (bytes_parsed+8 > bytes) return BadLength;
483 bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each. */
484 break;
485
486 default: /* Parse Error */
487 return BadValue;
488 }
489
490 if (want_this)
491 {
492 ++settings_seen;
493 if (strcmp (name, XSETTINGS_TOOL_BAR_STYLE) == 0)
494 {
495 settings->tb_style = xstrdup (sval);
496 settings->seen |= SEEN_TB_STYLE;
497 }
498 #ifdef HAVE_XFT
499 else if (strcmp (name, XSETTINGS_FONT_NAME) == 0)
500 {
501 settings->font = xstrdup (sval);
502 settings->seen |= SEEN_FONT;
503 }
504 else if (strcmp (name, "Xft/Antialias") == 0)
505 {
506 settings->seen |= SEEN_AA;
507 settings->aa = ival != 0;
508 }
509 else if (strcmp (name, "Xft/Hinting") == 0)
510 {
511 settings->seen |= SEEN_HINTING;
512 settings->hinting = ival != 0;
513 }
514 # ifdef FC_HINT_STYLE
515 else if (strcmp (name, "Xft/HintStyle") == 0)
516 {
517 settings->seen |= SEEN_HINTSTYLE;
518 if (strcmp (sval, "hintnone") == 0)
519 settings->hintstyle = FC_HINT_NONE;
520 else if (strcmp (sval, "hintslight") == 0)
521 settings->hintstyle = FC_HINT_SLIGHT;
522 else if (strcmp (sval, "hintmedium") == 0)
523 settings->hintstyle = FC_HINT_MEDIUM;
524 else if (strcmp (sval, "hintfull") == 0)
525 settings->hintstyle = FC_HINT_FULL;
526 else
527 settings->seen &= ~SEEN_HINTSTYLE;
528 }
529 # endif
530 else if (strcmp (name, "Xft/RGBA") == 0)
531 {
532 settings->seen |= SEEN_RGBA;
533 if (strcmp (sval, "none") == 0)
534 settings->rgba = FC_RGBA_NONE;
535 else if (strcmp (sval, "rgb") == 0)
536 settings->rgba = FC_RGBA_RGB;
537 else if (strcmp (sval, "bgr") == 0)
538 settings->rgba = FC_RGBA_BGR;
539 else if (strcmp (sval, "vrgb") == 0)
540 settings->rgba = FC_RGBA_VRGB;
541 else if (strcmp (sval, "vbgr") == 0)
542 settings->rgba = FC_RGBA_VBGR;
543 else
544 settings->seen &= ~SEEN_RGBA;
545 }
546 else if (strcmp (name, "Xft/DPI") == 0)
547 {
548 settings->seen |= SEEN_DPI;
549 settings->dpi = (double)ival/1024.0;
550 }
551 else if (strcmp (name, "Xft/lcdfilter") == 0)
552 {
553 settings->seen |= SEEN_LCDFILTER;
554 if (strcmp (sval, "none") == 0)
555 settings->lcdfilter = FC_LCD_NONE;
556 else if (strcmp (sval, "lcddefault") == 0)
557 settings->lcdfilter = FC_LCD_DEFAULT;
558 else
559 settings->seen &= ~SEEN_LCDFILTER;
560 }
561 #endif /* HAVE_XFT */
562 }
563 }
564
565 return settings_seen;
566 }
567
568 /* Read settings from the XSettings property window on display for DPYINFO.
569 Store settings read in SETTINGS.
570 Return non-zero if successful, zero if not. */
571
572 static int
573 read_settings (struct x_display_info *dpyinfo, struct xsettings *settings)
574 {
575 Atom act_type;
576 int act_form;
577 unsigned long nitems, bytes_after;
578 unsigned char *prop = NULL;
579 Display *dpy = dpyinfo->display;
580 int rc;
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 rc = parse_settings (prop, nitems, settings);
593
594 XFree (prop);
595
596 x_uncatch_errors ();
597
598 return rc != 0;
599 }
600
601 /* Apply Xft settings in SETTINGS to the Xft library.
602 If SEND_EVENT_P is non-zero store a Lisp event that Xft settings changed. */
603
604 static void
605 apply_xft_settings (struct x_display_info *dpyinfo,
606 int send_event_p,
607 struct xsettings *settings)
608 {
609 #ifdef HAVE_XFT
610 FcPattern *pat;
611 struct xsettings oldsettings;
612 int changed = 0;
613
614 memset (&oldsettings, 0, sizeof (oldsettings));
615 pat = FcPatternCreate ();
616 XftDefaultSubstitute (dpyinfo->display,
617 XScreenNumberOfScreen (dpyinfo->screen),
618 pat);
619 FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa);
620 FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting);
621 #ifdef FC_HINT_STYLE
622 FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle);
623 #endif
624 FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter);
625 FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba);
626 FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi);
627
628 if ((settings->seen & SEEN_AA) != 0 && oldsettings.aa != settings->aa)
629 {
630 FcPatternDel (pat, FC_ANTIALIAS);
631 FcPatternAddBool (pat, FC_ANTIALIAS, settings->aa);
632 ++changed;
633 oldsettings.aa = settings->aa;
634 }
635
636 if ((settings->seen & SEEN_HINTING) != 0
637 && oldsettings.hinting != settings->hinting)
638 {
639 FcPatternDel (pat, FC_HINTING);
640 FcPatternAddBool (pat, FC_HINTING, settings->hinting);
641 ++changed;
642 oldsettings.hinting = settings->hinting;
643 }
644 if ((settings->seen & SEEN_RGBA) != 0 && oldsettings.rgba != settings->rgba)
645 {
646 FcPatternDel (pat, FC_RGBA);
647 FcPatternAddInteger (pat, FC_RGBA, settings->rgba);
648 oldsettings.rgba = settings->rgba;
649 ++changed;
650 }
651
652 /* Older fontconfig versions don't have FC_LCD_FILTER. */
653 if ((settings->seen & SEEN_LCDFILTER) != 0
654 && oldsettings.lcdfilter != settings->lcdfilter)
655 {
656 FcPatternDel (pat, FC_LCD_FILTER);
657 FcPatternAddInteger (pat, FC_LCD_FILTER, settings->lcdfilter);
658 ++changed;
659 oldsettings.lcdfilter = settings->lcdfilter;
660 }
661
662 #ifdef FC_HINT_STYLE
663 if ((settings->seen & SEEN_HINTSTYLE) != 0
664 && oldsettings.hintstyle != settings->hintstyle)
665 {
666 FcPatternDel (pat, FC_HINT_STYLE);
667 FcPatternAddInteger (pat, FC_HINT_STYLE, settings->hintstyle);
668 ++changed;
669 oldsettings.hintstyle = settings->hintstyle;
670 }
671 #endif
672
673 if ((settings->seen & SEEN_DPI) != 0 && oldsettings.dpi != settings->dpi
674 && settings->dpi > 0)
675 {
676 Lisp_Object frame, tail;
677
678 FcPatternDel (pat, FC_DPI);
679 FcPatternAddDouble (pat, FC_DPI, settings->dpi);
680 ++changed;
681 oldsettings.dpi = settings->dpi;
682
683 /* Change the DPI on this display and all frames on the display. */
684 dpyinfo->resy = dpyinfo->resx = settings->dpi;
685 FOR_EACH_FRAME (tail, frame)
686 if (FRAME_X_P (XFRAME (frame))
687 && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
688 XFRAME (frame)->resy = XFRAME (frame)->resx = settings->dpi;
689 }
690
691 if (changed)
692 {
693 static char const format[] =
694 "Antialias: %d, Hinting: %d, RGBA: %d, LCDFilter: %d, "
695 "Hintstyle: %d, DPI: %lf";
696 enum
697 {
698 d_formats = 5,
699 d_growth = INT_BUFSIZE_BOUND (int) - sizeof "%d",
700 lf_formats = 1,
701 max_f_integer_digits = DBL_MAX_10_EXP + 1,
702 f_precision = 6,
703 lf_growth = (sizeof "-." + max_f_integer_digits + f_precision
704 - sizeof "%lf")
705 };
706 char buf[sizeof format + d_formats * d_growth + lf_formats * lf_growth];
707
708 XftDefaultSet (dpyinfo->display, pat);
709 if (send_event_p)
710 store_config_changed_event (Qfont_render,
711 XCAR (dpyinfo->name_list_element));
712 Vxft_settings
713 = make_formatted_string (buf, format,
714 oldsettings.aa, oldsettings.hinting,
715 oldsettings.rgba, oldsettings.lcdfilter,
716 oldsettings.hintstyle, oldsettings.dpi);
717
718 }
719 else
720 FcPatternDestroy (pat);
721 #endif /* HAVE_XFT */
722 }
723
724 /* Read XSettings from the display for DPYINFO.
725 If SEND_EVENT_P is non-zero store a Lisp event settings that changed. */
726
727 static void
728 read_and_apply_settings (struct x_display_info *dpyinfo, int send_event_p)
729 {
730 struct xsettings settings;
731
732 if (!read_settings (dpyinfo, &settings))
733 return;
734
735 apply_xft_settings (dpyinfo, True, &settings);
736 if (settings.seen & SEEN_TB_STYLE)
737 {
738 if (send_event_p)
739 store_tool_bar_style_changed (settings.tb_style, dpyinfo);
740 else
741 current_tool_bar_style = map_tool_bar_style (settings.tb_style);
742 xfree (settings.tb_style);
743 }
744 #ifdef HAVE_XFT
745 if (settings.seen & SEEN_FONT)
746 {
747 if (send_event_p)
748 store_font_name_changed (settings.font);
749 else
750 {
751 xfree (current_font);
752 current_font = xstrdup (settings.font);
753 }
754 xfree (settings.font);
755 }
756 #endif
757 }
758
759 /* Check if EVENT for the display in DPYINFO is XSettings related. */
760
761 void
762 xft_settings_event (struct x_display_info *dpyinfo, XEvent *event)
763 {
764 int check_window_p = 0;
765 int apply_settings = 0;
766
767 switch (event->type)
768 {
769 case DestroyNotify:
770 if (dpyinfo->xsettings_window == event->xany.window)
771 check_window_p = 1;
772 break;
773
774 case ClientMessage:
775 if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr
776 && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel
777 && event->xclient.window == dpyinfo->root_window)
778 check_window_p = 1;
779 break;
780
781 case PropertyNotify:
782 if (event->xproperty.window == dpyinfo->xsettings_window
783 && event->xproperty.state == PropertyNewValue
784 && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop)
785 apply_settings = 1;
786 break;
787 }
788
789
790 if (check_window_p)
791 {
792 dpyinfo->xsettings_window = None;
793 get_prop_window (dpyinfo);
794 if (dpyinfo->xsettings_window != None)
795 apply_settings = 1;
796 }
797
798 if (apply_settings)
799 read_and_apply_settings (dpyinfo, True);
800 }
801
802 /* Initialize GSettings and read startup values. */
803
804 static void
805 init_gsettings (void)
806 {
807 #ifdef HAVE_GSETTINGS
808 GVariant *val;
809 const gchar *const *schemas;
810 int schema_found = 0;
811
812 #ifdef HAVE_G_TYPE_INIT
813 g_type_init ();
814 #endif
815
816 schemas = g_settings_list_schemas ();
817 if (schemas == NULL) return;
818 while (! schema_found && *schemas != NULL)
819 schema_found = strcmp (*schemas++, GSETTINGS_SCHEMA) == 0;
820 if (!schema_found) return;
821
822 gsettings_client = g_settings_new (GSETTINGS_SCHEMA);
823 if (!gsettings_client) return;
824 g_object_ref_sink (G_OBJECT (gsettings_client));
825 g_signal_connect (G_OBJECT (gsettings_client), "changed",
826 G_CALLBACK (something_changed_gsettingsCB), NULL);
827
828 val = g_settings_get_value (gsettings_client, GSETTINGS_TOOL_BAR_STYLE);
829 if (val)
830 {
831 g_variant_ref_sink (val);
832 if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
833 current_tool_bar_style
834 = map_tool_bar_style (g_variant_get_string (val, NULL));
835 g_variant_unref (val);
836 }
837
838 #ifdef HAVE_XFT
839 val = g_settings_get_value (gsettings_client, GSETTINGS_MONO_FONT);
840 if (val)
841 {
842 g_variant_ref_sink (val);
843 if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
844 current_mono_font = xstrdup (g_variant_get_string (val, NULL));
845 g_variant_unref (val);
846 }
847
848 val = g_settings_get_value (gsettings_client, GSETTINGS_FONT_NAME);
849 if (val)
850 {
851 g_variant_ref_sink (val);
852 if (g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
853 current_font = xstrdup (g_variant_get_string (val, NULL));
854 g_variant_unref (val);
855 }
856 #endif /* HAVE_XFT */
857
858 #endif /* HAVE_GSETTINGS */
859 }
860
861 /* Init GConf and read startup values. */
862
863 static void
864 init_gconf (void)
865 {
866 #if defined (HAVE_GCONF)
867 char *s;
868
869 #ifdef HAVE_G_TYPE_INIT
870 g_type_init ();
871 #endif
872
873 gconf_client = gconf_client_get_default ();
874 gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE);
875 gconf_client_add_dir (gconf_client,
876 GCONF_TOOL_BAR_STYLE,
877 GCONF_CLIENT_PRELOAD_ONELEVEL,
878 NULL);
879 gconf_client_notify_add (gconf_client,
880 GCONF_TOOL_BAR_STYLE,
881 something_changed_gconfCB,
882 NULL, NULL, NULL);
883
884 s = gconf_client_get_string (gconf_client, GCONF_TOOL_BAR_STYLE, NULL);
885 if (s)
886 {
887 current_tool_bar_style = map_tool_bar_style (s);
888 g_free (s);
889 }
890
891 #ifdef HAVE_XFT
892 s = gconf_client_get_string (gconf_client, GCONF_MONO_FONT, NULL);
893 if (s)
894 {
895 current_mono_font = xstrdup (s);
896 g_free (s);
897 }
898 s = gconf_client_get_string (gconf_client, GCONF_FONT_NAME, NULL);
899 if (s)
900 {
901 current_font = xstrdup (s);
902 g_free (s);
903 }
904 gconf_client_add_dir (gconf_client,
905 GCONF_MONO_FONT,
906 GCONF_CLIENT_PRELOAD_ONELEVEL,
907 NULL);
908 gconf_client_notify_add (gconf_client,
909 GCONF_MONO_FONT,
910 something_changed_gconfCB,
911 NULL, NULL, NULL);
912 gconf_client_add_dir (gconf_client,
913 GCONF_FONT_NAME,
914 GCONF_CLIENT_PRELOAD_ONELEVEL,
915 NULL);
916 gconf_client_notify_add (gconf_client,
917 GCONF_FONT_NAME,
918 something_changed_gconfCB,
919 NULL, NULL, NULL);
920 #endif /* HAVE_XFT */
921 #endif /* HAVE_GCONF */
922 }
923
924 /* Init Xsettings and read startup values. */
925
926 static void
927 init_xsettings (struct x_display_info *dpyinfo)
928 {
929 Display *dpy = dpyinfo->display;
930
931 block_input ();
932
933 /* Select events so we can detect client messages sent when selection
934 owner changes. */
935 XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask);
936
937 get_prop_window (dpyinfo);
938 if (dpyinfo->xsettings_window != None)
939 read_and_apply_settings (dpyinfo, False);
940
941 unblock_input ();
942 }
943
944 void
945 xsettings_initialize (struct x_display_info *dpyinfo)
946 {
947 if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo;
948 init_gconf ();
949 init_xsettings (dpyinfo);
950 init_gsettings ();
951 }
952
953 /* Return the system monospaced font.
954 May be NULL if not known. */
955
956 const char *
957 xsettings_get_system_font (void)
958 {
959 return current_mono_font;
960 }
961
962 #ifdef USE_LUCID
963 /* Return the system font.
964 May be NULL if not known. */
965
966 const char *
967 xsettings_get_system_normal_font (void)
968 {
969 return current_font;
970 }
971 #endif
972
973 DEFUN ("font-get-system-normal-font", Ffont_get_system_normal_font,
974 Sfont_get_system_normal_font,
975 0, 0, 0,
976 doc: /* Get the system default application font. */)
977 (void)
978 {
979 return current_font ? build_string (current_font) : Qnil;
980 }
981
982 DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font,
983 0, 0, 0,
984 doc: /* Get the system default fixed width font. */)
985 (void)
986 {
987 return current_mono_font ? build_string (current_mono_font) : Qnil;
988 }
989
990 DEFUN ("tool-bar-get-system-style", Ftool_bar_get_system_style,
991 Stool_bar_get_system_style, 0, 0, 0,
992 doc: /* Get the system tool bar style.
993 If no system tool bar style is known, return `tool-bar-style' if set to a
994 known style. Otherwise return image. */)
995 (void)
996 {
997 if (EQ (Vtool_bar_style, Qimage)
998 || EQ (Vtool_bar_style, Qtext)
999 || EQ (Vtool_bar_style, Qboth)
1000 || EQ (Vtool_bar_style, Qboth_horiz)
1001 || EQ (Vtool_bar_style, Qtext_image_horiz))
1002 return Vtool_bar_style;
1003 if (!NILP (current_tool_bar_style))
1004 return current_tool_bar_style;
1005 return Qimage;
1006 }
1007
1008 void
1009 syms_of_xsettings (void)
1010 {
1011 current_mono_font = NULL;
1012 current_font = NULL;
1013 first_dpyinfo = NULL;
1014 #ifdef HAVE_GSETTINGS
1015 gsettings_client = NULL;
1016 #endif
1017 #ifdef HAVE_GCONF
1018 gconf_client = NULL;
1019 #endif
1020
1021 DEFSYM (Qmonospace_font_name, "monospace-font-name");
1022 DEFSYM (Qfont_name, "font-name");
1023 DEFSYM (Qfont_render, "font-render");
1024 defsubr (&Sfont_get_system_font);
1025 defsubr (&Sfont_get_system_normal_font);
1026
1027 DEFVAR_BOOL ("font-use-system-font", use_system_font,
1028 doc: /* Non-nil means to apply the system defined font dynamically.
1029 When this is non-nil and the system defined fixed width font changes, we
1030 update frames dynamically.
1031 If this variable is nil, Emacs ignores system font changes. */);
1032 use_system_font = 0;
1033
1034 DEFVAR_LISP ("xft-settings", Vxft_settings,
1035 doc: /* Font settings applied to Xft. */);
1036 Vxft_settings = empty_unibyte_string;
1037
1038 #ifdef HAVE_XFT
1039 Fprovide (intern_c_string ("font-render-setting"), Qnil);
1040 #if defined (HAVE_GCONF) || defined (HAVE_GSETTINGS)
1041 Fprovide (intern_c_string ("system-font-setting"), Qnil);
1042 #endif
1043 #endif
1044
1045 current_tool_bar_style = Qnil;
1046 DEFSYM (Qtool_bar_style, "tool-bar-style");
1047 defsubr (&Stool_bar_get_system_style);
1048
1049 Fprovide (intern_c_string ("dynamic-setting"), Qnil);
1050 }
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