1 files changed, 68 insertions, 0 deletions
diff --git a/gfx/layers/ZoomConstraints.h b/gfx/layers/ZoomConstraints.h
new file mode 100644
index 0000000000..1050f37332
--- /dev/null
+++ b/gfx/layers/ZoomConstraints.h
@@ -0,0 +1,68 @@
+/* -*- 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 GFX_ZOOMCONSTRAINTS_H
+#define GFX_ZOOMCONSTRAINTS_H
+
+#include <iosfwd>
+
+#include "Units.h"  // for CSSRect, CSSPixel, etc
+#include "mozilla/Maybe.h"
+#include "mozilla/layers/ScrollableLayerGuid.h"  // for ScrollableLayerGuid
+
+namespace mozilla {
+namespace layers {
+
+struct ZoomConstraints {
+  bool mAllowZoom;
+  bool mAllowDoubleTapZoom;
+  CSSToParentLayerScale mMinZoom;
+  CSSToParentLayerScale mMaxZoom;
+
+  ZoomConstraints() : mAllowZoom(true), mAllowDoubleTapZoom(true) {
+    MOZ_COUNT_CTOR(ZoomConstraints);
+  }
+
+  ZoomConstraints(bool aAllowZoom, bool aAllowDoubleTapZoom,
+                  const CSSToParentLayerScale& aMinZoom,
+                  const CSSToParentLayerScale& aMaxZoom)
+      : mAllowZoom(aAllowZoom),
+        mAllowDoubleTapZoom(aAllowDoubleTapZoom),
+        mMinZoom(aMinZoom),
+        mMaxZoom(aMaxZoom) {
+    MOZ_COUNT_CTOR(ZoomConstraints);
+  }
+
+  ZoomConstraints(const ZoomConstraints& other)
+      : mAllowZoom(other.mAllowZoom),
+        mAllowDoubleTapZoom(other.mAllowDoubleTapZoom),
+        mMinZoom(other.mMinZoom),
+        mMaxZoom(other.mMaxZoom) {
+    MOZ_COUNT_CTOR(ZoomConstraints);
+  }
+
+  MOZ_COUNTED_DTOR(ZoomConstraints)
+
+  bool operator==(const ZoomConstraints& other) const {
+    return mAllowZoom == other.mAllowZoom &&
+           mAllowDoubleTapZoom == other.mAllowDoubleTapZoom &&
+           mMinZoom == other.mMinZoom && mMaxZoom == other.mMaxZoom;
+  }
+
+  bool operator!=(const ZoomConstraints& other) const {
+    return !(*this == other);
+  }
+
+  friend std::ostream& operator<<(std::ostream& aStream,
+                                  const ZoomConstraints& z);
+};
+
+typedef Maybe<ZoomConstraints> MaybeZoomConstraints;
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif /* GFX_ZOOMCONSTRAINTS_H */