1 files changed, 33 insertions, 0 deletions
diff --git a/gfx/layers/apz/src/TouchCounter.h b/gfx/layers/apz/src/TouchCounter.h
new file mode 100644
index 000000000..f2c45486e
--- /dev/null
+++ b/gfx/layers/apz/src/TouchCounter.h
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layers_TouchCounter_h
+#define mozilla_layers_TouchCounter_h
+
+#include "mozilla/EventForwards.h"
+
+namespace mozilla {
+
+class MultiTouchInput;
+
+namespace layers {
+
+// TouchCounter simply tracks the number of active touch points. Feed it
+// your input events to update the internal state.
+class TouchCounter
+{
+public:
+  TouchCounter();
+  void Update(const MultiTouchInput& aInput);
+  uint32_t GetActiveTouchCount() const;
+
+private:
+  uint32_t mActiveTouchCount;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif /* mozilla_layers_TouchCounter_h */