1 files changed, 50 insertions, 0 deletions
diff --git a/gfx/src/ArrayView.h b/gfx/src/ArrayView.h
new file mode 100644
index 000000000..3c6704f43
--- /dev/null
+++ b/gfx/src/ArrayView.h
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 20; 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_GFX_ARRAY_VIEW_H_
+#define MOZILLA_GFX_ARRAY_VIEW_H_
+
+#include "nsTArray.h"
+
+/* This is similar to mfbt/Range.h but has implicit conversion
+ * from nsTArray and less bounds checking.
+ * For now, prefer Range over ArrayView */
+
+namespace mozilla {
+namespace gfx {
+
+template<typename T>
+class ArrayView
+{
+    public:
+        MOZ_IMPLICIT ArrayView(const nsTArray<T>& aData) :
+            mData(aData.Elements()), mLength(aData.Length())
+        {
+        }
+        ArrayView(const T* aData, const size_t aLength) :
+            mData(aData), mLength(aLength)
+        {
+        }
+        const T& operator[](const size_t aIdx) const
+        {
+            return mData[aIdx];
+        }
+        size_t Length() const
+        {
+            return mLength;
+        }
+        const T* Data() const
+        {
+            return mData;
+        }
+    private:
+        const T* mData;
+        const size_t mLength;
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* MOZILLA_GFX_ARRAY_VIEW_H_ */