/* Functions for handle font changes dynamically. Copyright (C) 2009 Free Software Foundation, Inc. This file is part of GNU Emacs. GNU Emacs is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. GNU Emacs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Emacs. If not, see . */ #include "config.h" #include #include #include "lisp.h" #include "xterm.h" #include "xsettings.h" #include "frame.h" #include "blockinput.h" #include "termhooks.h" #include "termopts.h" #include #ifdef HAVE_GCONF #include #endif #ifdef HAVE_XFT #include #endif static char *current_mono_font; static struct x_display_info *first_dpyinfo; static Lisp_Object Qfont_name, Qfont_render; static int use_system_font; #ifdef HAVE_GCONF static GConfClient *gconf_client; #endif static void store_font_changed_event (arg, display_name) Lisp_Object arg; Lisp_Object display_name; { struct input_event event; EVENT_INIT (event); event.kind = CONFIG_CHANGED_EVENT; event.frame_or_window = display_name; event.arg = arg; kbd_buffer_store_event (&event); } #ifdef HAVE_GCONF #define SYSTEM_MONO_FONT "/desktop/gnome/interface/monospace_font_name" /* Callback called when something changed in GConf that we care about, that is SYSTEM_MONO_FONT. */ static void something_changedCB (client, cnxn_id, entry, user_data) GConfClient *client; guint cnxn_id; GConfEntry *entry; gpointer user_data; { GConfValue *v = gconf_entry_get_value (entry); if (!v) return; if (v->type == GCONF_VALUE_STRING) { const char *value = gconf_value_get_string (v); int i; if (current_mono_font != NULL && strcmp (value, current_mono_font) == 0) return; // No change. xfree (current_mono_font); current_mono_font = xstrdup (value); } if (first_dpyinfo != NULL) { /* Check if display still open */ struct x_display_info *dpyinfo; int found = 0; for (dpyinfo = x_display_list; !found && dpyinfo; dpyinfo = dpyinfo->next) found = dpyinfo == first_dpyinfo; if (found && use_system_font) store_font_changed_event (Qfont_name, XCAR (first_dpyinfo->name_list_element)); } } #endif /* HAVE_GCONF */ #ifdef HAVE_XFT /* Older fontconfig versions don't have FC_LCD_*. */ #ifndef FC_LCD_NONE #define FC_LCD_NONE 0 #endif #ifndef FC_LCD_DEFAULT #define FC_LCD_DEFAULT 1 #endif #ifndef FC_LCD_FILTER #define FC_LCD_FILTER "lcdfilter" #endif /* Find the window that contains the XSETTINGS property values. */ static void get_prop_window (dpyinfo) struct x_display_info *dpyinfo; { Display *dpy = dpyinfo->display; XGrabServer (dpy); dpyinfo->xsettings_window = XGetSelectionOwner (dpy, dpyinfo->Xatom_xsettings_sel); if (dpyinfo->xsettings_window != None) /* Select events so we can detect if window is deleted or if settings are changed. */ XSelectInput (dpy, dpyinfo->xsettings_window, PropertyChangeMask|StructureNotifyMask); XUngrabServer (dpy); } struct xsettings { FcBool aa, hinting; int rgba, lcdfilter, hintstyle; double dpi; }; #define SWAP32(nr) (((nr) << 24) | (((nr) << 8) & 0xff0000) \ | (((nr) >> 8) & 0xff00) | ((nr) >> 24)) #define SWAP16(nr) (((nr) << 8) | ((nr) >> 8)) #define PAD(nr) (((nr) + 3) & ~3) /* Parse xsettings and extract those that deal with Xft. See http://freedesktop.org/wiki/Specifications/XSettingsRegistry and http://standards.freedesktop.org/xsettings-spec/xsettings-spec-0.5.html. Layout of prop. First is a header: bytes type what ------------------------------------ 1 CARD8 byte-order 3 unused 4 CARD32 SERIAL 4 CARD32 N_SETTINGS Then N_SETTINGS records, with header: bytes type what ------------------------------------ 1 SETTING_TYPE type (0 = integer, 1 = string, 2 RGB color). 1 unused 2 CARD16 n == name-length n STRING8 name p unused, p=pad_to_even_4(n) 4 CARD32 last-change-serial and then the value, For string: bytes type what ------------------------------------ 4 CARD32 n = value-length n STRING8 value p unused, p=pad_to_even_4(n) For integer: bytes type what ------------------------------------ 4 INT32 value For RGB color: bytes type what ------------------------------------ 2 CARD16 red 2 CARD16 blue 2 CARD16 green 2 CARD16 alpha */ static int parse_xft_settings (prop, bytes, settings) unsigned char *prop; unsigned long bytes; struct xsettings *settings; { Lisp_Object byteorder = Fbyteorder (); int my_bo = XFASTINT (byteorder) == 'B' ? MSBFirst : LSBFirst; int that_bo = prop[0]; CARD32 n_settings; int bytes_parsed = 0; int settings_seen = 0; int i = 0; /* First 4 bytes is a serial number, skip that. */ if (bytes < 12) return BadLength; memcpy (&n_settings, prop+8, 4); if (my_bo != that_bo) n_settings = SWAP32 (n_settings); bytes_parsed = 12; memset (settings, 0, sizeof (*settings)); while (bytes_parsed+4 < bytes && settings_seen < 6 && i < n_settings) { int type = prop[bytes_parsed++]; CARD16 nlen; CARD32 vlen, ival = 0; char name[128]; /* The names we are looking for are not this long. */ char sval[128]; /* The values we are looking for are not this long. */ int is_xft; int to_cpy; sval[0] = '\0'; ++i; ++bytes_parsed; /* Padding */ memcpy (&nlen, prop+bytes_parsed, 2); bytes_parsed += 2; if (my_bo != that_bo) nlen = SWAP16 (nlen); if (bytes_parsed+nlen > bytes) return BadLength; to_cpy = nlen > 127 ? 127 : nlen; memcpy (name, prop+bytes_parsed, to_cpy); name[to_cpy] = '\0'; bytes_parsed += nlen; bytes_parsed = PAD (bytes_parsed); bytes_parsed += 4; /* Skip serial for this value */ if (bytes_parsed > bytes) return BadLength; is_xft = nlen > 6 && strncmp (name, "Xft/", 4) == 0; switch (type) { case 0: /* Integer */ if (bytes_parsed+4 > bytes) return BadLength; if (is_xft) { memcpy (&ival, prop+bytes_parsed, 4); if (my_bo != that_bo) ival = SWAP32 (ival); } bytes_parsed += 4; break; case 1: /* String */ if (bytes_parsed+4 > bytes) return BadLength; memcpy (&vlen, prop+bytes_parsed, 4); bytes_parsed += 4; if (my_bo != that_bo) vlen = SWAP32 (vlen); if (is_xft) { to_cpy = vlen > 127 ? 127 : vlen; memcpy (sval, prop+bytes_parsed, to_cpy); sval[to_cpy] = '\0'; } bytes_parsed += vlen; bytes_parsed = PAD (bytes_parsed); break; case 2: /* RGB value */ /* No need to parse this */ if (bytes_parsed+8 > bytes) return BadLength; bytes_parsed += 8; /* 4 values (r, b, g, alpha), 2 bytes each. */ break; default: /* Parse Error */ return BadValue; } if (is_xft) { ++settings_seen; if (strcmp (name, "Xft/Antialias") == 0) settings->aa = ival != 0; else if (strcmp (name, "Xft/Hinting") == 0) settings->hinting = ival != 0; else if (strcmp (name, "Xft/HintStyle") == 0) { if (strcmp (sval, "hintnone") == 0) settings->hintstyle = FC_HINT_NONE; else if (strcmp (sval, "hintslight") == 0) settings->hintstyle = FC_HINT_SLIGHT; else if (strcmp (sval, "hintmedium") == 0) settings->hintstyle = FC_HINT_MEDIUM; else if (strcmp (sval, "hintfull") == 0) settings->hintstyle = FC_HINT_FULL; } else if (strcmp (name, "Xft/RGBA") == 0) { if (strcmp (sval, "none") == 0) settings->rgba = FC_RGBA_NONE; else if (strcmp (sval, "rgb") == 0) settings->rgba = FC_RGBA_RGB; else if (strcmp (sval, "bgr") == 0) settings->rgba = FC_RGBA_BGR; else if (strcmp (sval, "vrgb") == 0) settings->rgba = FC_RGBA_VRGB; else if (strcmp (sval, "vbgr") == 0) settings->rgba = FC_RGBA_VBGR; } else if (strcmp (name, "Xft/DPI") == 0) settings->dpi = (double)ival/1024.0; else if (strcmp (name, "Xft/lcdfilter") == 0) { if (strcmp (sval, "none") == 0) settings->lcdfilter = FC_LCD_NONE; else if (strcmp (sval, "lcddefault") == 0) settings->lcdfilter = FC_LCD_DEFAULT; } } } return Success; } static int read_xft_settings (dpyinfo, settings) struct x_display_info *dpyinfo; struct xsettings *settings; { long long_len; Atom act_type; int act_form; unsigned long nitems, bytes_after; unsigned char *prop = NULL; Display *dpy = dpyinfo->display; int rc; x_catch_errors (dpy); rc = XGetWindowProperty (dpy, dpyinfo->xsettings_window, dpyinfo->Xatom_xsettings_prop, 0, LONG_MAX, False, AnyPropertyType, &act_type, &act_form, &nitems, &bytes_after, &prop); if (rc == Success && prop != NULL && act_form == 8 && nitems > 0 && act_type == dpyinfo->Xatom_xsettings_prop) rc = parse_xft_settings (prop, nitems, settings); XFree (prop); x_uncatch_errors (); return rc == Success; } static void apply_xft_settings (dpyinfo, send_event_p) struct x_display_info *dpyinfo; int send_event_p; { FcPattern *pat; struct xsettings settings, oldsettings; int changed = 0; if (!read_xft_settings (dpyinfo, &settings)) return; memset (&oldsettings, 0, sizeof (oldsettings)); pat = FcPatternCreate (); XftDefaultSubstitute (dpyinfo->display, XScreenNumberOfScreen (dpyinfo->screen), pat); FcPatternGetBool (pat, FC_ANTIALIAS, 0, &oldsettings.aa); FcPatternGetBool (pat, FC_HINTING, 0, &oldsettings.hinting); FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &oldsettings.hintstyle); FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &oldsettings.lcdfilter); FcPatternGetInteger (pat, FC_RGBA, 0, &oldsettings.rgba); FcPatternGetDouble (pat, FC_DPI, 0, &oldsettings.dpi); if (oldsettings.aa != settings.aa) { FcPatternDel (pat, FC_ANTIALIAS); FcPatternAddBool (pat, FC_ANTIALIAS, settings.aa); ++changed; } if (oldsettings.hinting != settings.hinting) { FcPatternDel (pat, FC_HINTING); FcPatternAddBool (pat, FC_HINTING, settings.hinting); ++changed; } if (oldsettings.rgba != settings.rgba) { FcPatternDel (pat, FC_RGBA); FcPatternAddInteger (pat, FC_RGBA, settings.rgba); ++changed; } /* Older fontconfig versions don't have FC_LCD_FILTER. */ if (oldsettings.lcdfilter != settings.lcdfilter) { FcPatternDel (pat, FC_LCD_FILTER); FcPatternAddInteger (pat, FC_LCD_FILTER, settings.lcdfilter); ++changed; } if (oldsettings.hintstyle != settings.hintstyle) { FcPatternDel (pat, FC_HINT_STYLE); FcPatternAddInteger (pat, FC_HINT_STYLE, settings.hintstyle); ++changed; } if (oldsettings.dpi != settings.dpi) { Lisp_Object frame, tail; FcPatternDel (pat, FC_DPI); FcPatternAddDouble (pat, FC_DPI, settings.dpi); ++changed; /* Change the DPI on this display and all frames on the display. */ dpyinfo->resy = dpyinfo->resx = settings.dpi; FOR_EACH_FRAME (tail, frame) if (FRAME_X_P (XFRAME (frame)) && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo) XFRAME (frame)->resy = XFRAME (frame)->resx = settings.dpi; } if (changed) { XftDefaultSet (dpyinfo->display, pat); if (send_event_p) store_font_changed_event (Qfont_render, XCAR (dpyinfo->name_list_element)); } else FcPatternDestroy (pat); } #endif /* HAVE_XFT */ void xft_settings_event (dpyinfo, event) struct x_display_info *dpyinfo; XEvent *event; { #ifdef HAVE_XFT int check_window_p = 0; switch (event->type) { case DestroyNotify: if (dpyinfo->xsettings_window == event->xany.window) check_window_p = 1; break; case ClientMessage: if (event->xclient.message_type == dpyinfo->Xatom_xsettings_mgr && event->xclient.data.l[1] == dpyinfo->Xatom_xsettings_sel && event->xclient.window == dpyinfo->root_window) check_window_p = 1; break; case PropertyNotify: if (event->xproperty.window == dpyinfo->xsettings_window && event->xproperty.state == PropertyNewValue && event->xproperty.atom == dpyinfo->Xatom_xsettings_prop) { apply_xft_settings (dpyinfo, True); } break; } if (check_window_p) { dpyinfo->xsettings_window = None; get_prop_window (dpyinfo); if (dpyinfo->xsettings_window != None) apply_xft_settings (dpyinfo, True); } #endif /* HAVE_XFT */ } static void init_gconf () { #ifdef HAVE_GCONF int i; char *s; /* Should be enough, this is called at startup */ #define N_FDS 1024 int fd_before[N_FDS], fd_before1[N_FDS]; int dummy, n_fds; GPollFD gfds[N_FDS]; /* To find out which filedecriptors GConf uses, check before and after. If we do not do this, GConf changes will only happen when Emacs gets an X event. */ memset (fd_before, 0, sizeof (fd_before)); n_fds = g_main_context_query (g_main_context_default (), G_PRIORITY_LOW, &dummy, gfds, N_FDS); for (i = 0; i < n_fds; ++i) if (gfds[i].fd < N_FDS && gfds[i].fd > 0 && gfds[i].events > 0) fd_before[gfds[i].fd] = 1; g_type_init (); gconf_client = gconf_client_get_default (); s = gconf_client_get_string (gconf_client, SYSTEM_MONO_FONT, NULL); if (s) { current_mono_font = xstrdup (s); g_free (s); } gconf_client_set_error_handling (gconf_client, GCONF_CLIENT_HANDLE_NONE); gconf_client_add_dir (gconf_client, SYSTEM_MONO_FONT, GCONF_CLIENT_PRELOAD_ONELEVEL, NULL); gconf_client_notify_add (gconf_client, SYSTEM_MONO_FONT, something_changedCB, NULL, NULL, NULL); n_fds = g_main_context_query (g_main_context_default (), G_PRIORITY_LOW, &dummy, gfds, N_FDS); for (i = 0; i < n_fds; ++i) if (gfds[i].fd < N_FDS && gfds[i].fd > 0 && gfds[i].events > 0 && !fd_before[gfds[i].fd]) { #ifdef F_SETOWN fcntl (i, F_SETOWN, getpid ()); #endif /* ! defined (F_SETOWN) */ #ifdef SIGIO if (interrupt_input) init_sigio (i); #endif /* ! defined (SIGIO) */ } #endif /* HAVE_GCONF */ } static void init_xfd_settings (dpyinfo) struct x_display_info *dpyinfo; { #ifdef HAVE_XFT char sel[64]; Display *dpy = dpyinfo->display; BLOCK_INPUT; sprintf (sel, "_XSETTINGS_S%d", XScreenNumberOfScreen (dpyinfo->screen)); dpyinfo->Xatom_xsettings_sel = XInternAtom (dpy, sel, False); dpyinfo->Xatom_xsettings_prop = XInternAtom (dpy, "_XSETTINGS_SETTINGS", False); dpyinfo->Xatom_xsettings_mgr = XInternAtom (dpy, "MANAGER", False); /* Select events so we can detect client messages sent when selection owner changes. */ XSelectInput (dpy, dpyinfo->root_window, StructureNotifyMask); get_prop_window (dpyinfo); if (dpyinfo->xsettings_window != None) apply_xft_settings (dpyinfo, False); UNBLOCK_INPUT; #else /* ! HAVE_XFT */ dpyinfo->Xatom_xsettings_sel = None; dpyinfo->Xatom_xsettings_prop = None; dpyinfo->Xatom_xsettings_mgr = None; dpyinfo->xsettings_window = None; #endif /* ! HAVE_XFT */ } void xsettings_initialize (dpyinfo) struct x_display_info *dpyinfo; { if (first_dpyinfo == NULL) first_dpyinfo = dpyinfo; init_gconf (); init_xfd_settings (dpyinfo); } DEFUN ("font-get-system-font", Ffont_get_system_font, Sfont_get_system_font, 0, 0, 0, doc: /* Get the system default monospaced font. */) () { return current_mono_font && use_system_font ? make_string (current_mono_font, strlen (current_mono_font)) : Qnil; } void syms_of_xsettings () { current_mono_font = NULL; first_dpyinfo = NULL; #ifdef HAVE_GCONF gconf_client = NULL; #endif Qfont_name = intern_c_string ("font-name"); staticpro (&Qfont_name); Qfont_render = intern_c_string ("font-render"); staticpro (&Qfont_render); defsubr (&Sfont_get_system_font); DEFVAR_BOOL ("font-use-system-font", &use_system_font, doc: /* *Non-nil means to use the system defined font. */); use_system_font = 0; #ifdef HAVE_GCONF Fprovide (intern_c_string ("system-font-setting"), Qnil); #endif #ifdef HAVE_XFT Fprovide (intern_c_string ("font-render-setting"), Qnil); #endif }