1 files changed, 69 insertions, 0 deletions
diff --git a/engines/zvision/clock.cpp b/engines/zvision/clock.cpp
new file mode 100644
index 0000000000..fe322525f8
--- /dev/null
+++ b/engines/zvision/clock.cpp
@@ -0,0 +1,69 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 "common/scummsys.h"
+
+#include "common/system.h"
+
+#include "zvision/clock.h"
+
+namespace ZVision {
+
+Clock::Clock(OSystem *system) 
+	: _system(system),
+	  _lastTime(0),
+	  _deltaTime(0),
+	  _pausedTime(0),
+	  _paused(false) {
+}
+
+void Clock::update() {
+	uint32 currentTime = _system->getMillis();
+
+	_deltaTime = (currentTime - _lastTime);
+	if (_paused) {
+		_deltaTime -= (currentTime - _pausedTime);
+	}
+
+	if (_deltaTime < 0) {
+		_deltaTime = 0;
+	}
+
+	_lastTime = currentTime;
+}
+
+void Clock::start() {
+	if (_paused) {
+		_lastTime = _system->getMillis();
+		_paused = false;
+	}
+}
+
+void Clock::stop() {
+	if (!_paused) {
+		_pausedTime = _system->getMillis();
+		_paused = true;
+	}
+}
+
+} // End of namespace ZVision