1 files changed, 35 insertions, 0 deletions
diff --git a/gfx/layers/apz/util/DoubleTapToZoom.h b/gfx/layers/apz/util/DoubleTapToZoom.h
new file mode 100644
index 0000000000..163481fe03
--- /dev/null
+++ b/gfx/layers/apz/util/DoubleTapToZoom.h
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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_DoubleTapToZoom_h
+#define mozilla_layers_DoubleTapToZoom_h
+
+#include "Units.h"
+
+template <class T>
+class RefPtr;
+
+namespace mozilla {
+namespace dom {
+class Document;
+}
+
+namespace layers {
+
+/**
+ * For a double tap at |aPoint|, return the rect to which the browser
+ * should zoom in response, or an empty rect if the browser should zoom out.
+ * |aDocument| should be the root content document for the content that was
+ * tapped.
+ */
+CSSRect CalculateRectToZoomTo(
+    const RefPtr<mozilla::dom::Document>& aRootContentDocument,
+    const CSSPoint& aPoint);
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif /* mozilla_layers_DoubleTapToZoom_h */