Prototype infrastructure to disable screensaver

gtk2_ardour/screensaver.cc

@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2019 Robin Gareus <robin@gareus.org>
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "utils.h"
+
+#ifdef PLATFORM_WINDOWS
+/* http://www.blackwasp.co.uk/DisableScreensaver.aspx */
+#include <windows.h>
+
+void
+ARDOUR_UI_UTILS::enable_screensaver ()
+{
+	SetThreadExecutionState (ES_DISPLAY_REQUIRED | ES_SYSTEM_REQUIRED | ES_CONTINUOUS);
+}
+
+void
+ARDOUR_UI_UTILS::disable_screensaver ()
+{
+	SetThreadExecutionState (ES_CONTINUOUS);
+}
+
+#elif defined __APPLE__
+
+#include <IOKit/pwr_mgt/IOPMLib.h>
+
+static IOReturn success = kIOReturnError;
+static IOPMAssertionID assertion_id;
+
+void
+ARDOUR_UI_UTILS::enable_screensaver ()
+{
+	static const CFStringRef name = CFSTR("Ardour DAW");
+	/* kIOPMAssertionTypeNoDisplaySleep prevents display sleep,
+	 * kIOPMAssertionTypeNoIdleSleep prevents idle sleep
+	 */
+	success = IOPMAssertionCreateWithName (kIOPMAssertionTypeNoDisplaySleep, kIOPMAssertionLevelOn, name, &assertion_id);
+}
+
+void
+ARDOUR_UI_UTILS::disable_screensaver ()
+{
+	if (success != kIOReturnSuccess) {
+		return;
+	}
+	if (kIOReturnSuccess == IOPMAssertionRelease (assertion_id)) {
+		success = kIOReturnError;
+	}
+}
+
+#else /* Linux / X11 */
+
+#include <gtkmm.h>
+#include "ardour/system_exec.h"
+
+static sigc::connection glib_timer;
+
+static bool
+xdg_screensaver_reset ()
+{
+	char** args = (char**) malloc (5 * sizeof(char*));
+	args[0] = strdup ("/bin/sh");
+	args[1] = strdup ("-c");
+	args[2] = strdup ("xdg-screensaver");
+	args[3] = strdup ("reset");
+	args[4] = 0;
+
+	ARDOUR::SystemExec xdg_exec ("/bin/sh", args);
+	if (xdg_exec.start ()) {
+		return false;
+	}
+	xdg_exec.wait ();
+	return true; /* keep going */
+}
+
+void
+ARDOUR_UI_UTILS::enable_screensaver ()
+{
+	glib_timer = Glib::signal_timeout().connect_seconds (sigc::ptr_fun (&xdg_screensaver_reset), 45, Glib::PRIORITY_DEFAULT_IDLE);
+}
+
+void
+ARDOUR_UI_UTILS::disable_screensaver ()
+{
+	glib_timer.disconnect ();
+}
+
+#endif

gtk2_ardour/utils.h

@@ -7,7 +7,7 @@
  * Copyright (C) 2009-2012 Carl Hetherington <carl@carlh.net>
  * Copyright (C) 2009 David Robillard <d@drobilla.net>
  * Copyright (C) 2009 Sampo Savolainen <v2@iki.fi>
- * Copyright (C) 2013-2018 Robin Gareus <robin@gareus.org>
+ * Copyright (C) 2013-2019 Robin Gareus <robin@gareus.org>
  * Copyright (C) 2015 André Nusser <andre.nusser@googlemail.com>
  * Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
  *
@@ -107,5 +107,8 @@ bool windows_overlap (Gtk::Window *a, Gtk::Window *b);
 bool overwrite_file_dialog (Gtk::Window& parent, std::string title, std::string text);
 bool running_from_source_tree ();
 
+void enable_screensaver ();
+void disable_screensaver ();
+
 } // namespace
 #endif /* __ardour_gtk_utils_h__ */

gtk2_ardour/wscript

@@ -227,6 +227,7 @@ gtk2_ardour_sources = [
         'save_as_dialog.cc',
         'save_template_dialog.cc',
         'search_path_option.cc',
+        'screensaver.cc',
         'script_selector.cc',
         'selection.cc',
         'selection_memento.cc',