1 files changed, 33 insertions, 0 deletions
diff --git a/gfx/2d/StackArray.h b/gfx/2d/StackArray.h
new file mode 100644
index 0000000000..165d45cb12
--- /dev/null
+++ b/gfx/2d/StackArray.h
@@ -0,0 +1,33 @@
+/* -*- 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/. */
+
+/* A handy class that will allocate data for size*T objects on the stack and
+ * otherwise allocate them on the heap. It is similar in purpose to AutoTArray
+ */
+
+template <class T, size_t size>
+class StackArray final {
+ public:
+  explicit StackArray(size_t count) {
+    if (count > size) {
+      mData = new T[count];
+    } else {
+      mData = mStackData;
+    }
+  }
+  ~StackArray() {
+    if (mData != mStackData) {
+      delete[] mData;
+    }
+  }
+  T& operator[](size_t n) { return mData[n]; }
+  const T& operator[](size_t n) const { return mData[n]; }
+  T* data() { return mData; };
+
+ private:
+  T mStackData[size];
+  T* mData;
+};