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-rw-r--r--plugins/xsettings/fontconfig-monitor.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/plugins/xsettings/fontconfig-monitor.c b/plugins/xsettings/fontconfig-monitor.c
new file mode 100644
index 0000000..bfb15ed
--- /dev/null
+++ b/plugins/xsettings/fontconfig-monitor.c
@@ -0,0 +1,192 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2008 Red Hat, Inc.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Author: Behdad Esfahbod, Red Hat, Inc.
+ */
+
+#include "fontconfig-monitor.h"
+
+#include <gio/gio.h>
+#include <fontconfig/fontconfig.h>
+
+#define TIMEOUT_SECONDS 2
+
+static void
+stuff_changed (GFileMonitor *monitor,
+ GFile *file,
+ GFile *other_file,
+ GFileMonitorEvent event_type,
+ gpointer handle);
+
+void
+fontconfig_cache_init (void)
+{
+ FcInit ();
+}
+
+gboolean
+fontconfig_cache_update (void)
+{
+ return !FcConfigUptoDate (NULL) && FcInitReinitialize ();
+}
+
+static void
+monitor_files (GPtrArray *monitors,
+ FcStrList *list,
+ gpointer data)
+{
+ const char *str;
+
+ while ((str = (const char *) FcStrListNext (list))) {
+ GFile *file;
+ GFileMonitor *monitor;
+
+ file = g_file_new_for_path (str);
+
+ monitor = g_file_monitor (file, G_FILE_MONITOR_NONE, NULL, NULL);
+
+ g_object_unref (file);
+
+ if (!monitor)
+ continue;
+
+ g_signal_connect (monitor, "changed", G_CALLBACK (stuff_changed), data);
+
+ g_ptr_array_add (monitors, monitor);
+ }
+
+ FcStrListDone (list);
+}
+
+
+struct _fontconfig_monitor_handle {
+ GPtrArray *monitors;
+
+ guint timeout;
+
+ GFunc notify_callback;
+ gpointer notify_data;
+};
+
+static GPtrArray *
+monitors_create (gpointer data)
+{
+ GPtrArray *monitors = g_ptr_array_new ();
+
+ monitor_files (monitors, FcConfigGetConfigFiles (NULL), data);
+ monitor_files (monitors, FcConfigGetFontDirs (NULL) , data);
+
+ return monitors;
+}
+
+static void
+monitors_free (GPtrArray *monitors)
+{
+ if (!monitors)
+ return;
+
+ g_ptr_array_foreach (monitors, (GFunc) g_object_unref, NULL);
+ g_ptr_array_free (monitors, TRUE);
+}
+
+static gboolean
+update (gpointer data)
+{
+ fontconfig_monitor_handle_t *handle = data;
+ gboolean notify = FALSE;
+
+ handle->timeout = 0;
+
+ if (fontconfig_cache_update ()) {
+ notify = TRUE;
+ monitors_free (handle->monitors);
+ handle->monitors = monitors_create (data);
+ }
+
+ /* we finish modifying handle before calling the notify callback,
+ * allowing the callback to free the monitor if it decides to. */
+
+ if (notify && handle->notify_callback)
+ handle->notify_callback (data, handle->notify_data);
+
+ return FALSE;
+}
+
+static void
+stuff_changed (GFileMonitor *monitor G_GNUC_UNUSED,
+ GFile *file G_GNUC_UNUSED,
+ GFile *other_file G_GNUC_UNUSED,
+ GFileMonitorEvent event_type G_GNUC_UNUSED,
+ gpointer data)
+{
+ fontconfig_monitor_handle_t *handle = data;
+
+ /* wait for quiescence */
+ if (handle->timeout)
+ g_source_remove (handle->timeout);
+
+ handle->timeout = g_timeout_add_seconds (TIMEOUT_SECONDS, update, data);
+}
+
+
+fontconfig_monitor_handle_t *
+fontconfig_monitor_start (GFunc notify_callback,
+ gpointer notify_data)
+{
+ fontconfig_monitor_handle_t *handle = g_slice_new0 (fontconfig_monitor_handle_t);
+
+ handle->notify_callback = notify_callback;
+ handle->notify_data = notify_data;
+ handle->monitors = monitors_create (handle);
+
+ return handle;
+}
+
+void
+fontconfig_monitor_stop (fontconfig_monitor_handle_t *handle)
+{
+ if (handle->timeout)
+ g_source_remove (handle->timeout);
+ handle->timeout = 0;
+
+ monitors_free (handle->monitors);
+ handle->monitors = NULL;
+}
+
+#ifdef FONTCONFIG_MONITOR_TEST
+static void
+yay (void)
+{
+ g_message ("yay");
+}
+
+int
+main (void)
+{
+ GMainLoop *loop;
+
+ g_type_init ();
+
+ fontconfig_monitor_start ((GFunc) yay, NULL);
+
+ loop = g_main_loop_new (NULL, TRUE);
+ g_main_loop_run (loop);
+
+ return 0;
+}
+#endif