Add m-esr52 at 52.6.0

1 files changed, 47 insertions, 0 deletions

diff --git a/gfx/gl/HeapCopyOfStackArray.h b/gfx/gl/HeapCopyOfStackArray.h
new file mode 100644
index 000000000..2fae79245
--- /dev/null
+++ b/gfx/gl/HeapCopyOfStackArray.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=4 et sw=4 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 HEAPCOPYOFSTACKARRAY_H_
+#define HEAPCOPYOFSTACKARRAY_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/UniquePtr.h"
+
+#include <string.h>
+
+namespace mozilla {
+
+// Takes a stack array and copies it into a heap buffer.
+// Useful to retain the convenience of declaring static arrays, while
+// avoiding passing stack pointers to the GL (see bug 1005658).
+
+template <typename ElemType>
+class HeapCopyOfStackArray
+{
+public:
+  template<size_t N>
+  MOZ_IMPLICIT HeapCopyOfStackArray(ElemType (&array)[N])
+    : mArrayLength(N)
+    , mArrayData(MakeUnique<ElemType[]>(N))
+  {
+    memcpy(mArrayData.get(), &array[0], N * sizeof(ElemType));
+  }
+
+  ElemType* Data() const { return mArrayData.get(); }
+  size_t ArrayLength() const { return mArrayLength; }
+  size_t ByteLength() const { return mArrayLength * sizeof(ElemType); }
+
+private:
+  HeapCopyOfStackArray() = delete;
+  HeapCopyOfStackArray(const HeapCopyOfStackArray&) = delete;
+
+  const size_t mArrayLength;
+  UniquePtr<ElemType[]> const mArrayData;
+};
+
+} // namespace mozilla
+
+#endif // HEAPCOPYOFSTACKARRAY_H_