1 files changed, 37 insertions, 0 deletions
diff --git a/gfx/src/ArrayView.h b/gfx/src/ArrayView.h
new file mode 100644
index 0000000000..e5d5ace976
--- /dev/null
+++ b/gfx/src/ArrayView.h
@@ -0,0 +1,37 @@
+/* -*- 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_ */