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-rw-r--r--gfx/layers/apz/src/TouchCounter.h33
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diff --git a/gfx/layers/apz/src/TouchCounter.h b/gfx/layers/apz/src/TouchCounter.h
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+/* -*- 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 */