Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=4 et sw=4 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #ifndef HEAPCOPYOFSTACKARRAY_H_
       8             : #define HEAPCOPYOFSTACKARRAY_H_
       9             : 
      10             : #include "mozilla/Attributes.h"
      11             : #include "mozilla/UniquePtr.h"
      12             : 
      13             : #include <string.h>
      14             : 
      15             : namespace mozilla {
      16             : 
      17             : // Takes a stack array and copies it into a heap buffer.
      18             : // Useful to retain the convenience of declaring static arrays, while
      19             : // avoiding passing stack pointers to the GL (see bug 1005658).
      20             : 
      21             : template <typename ElemType>
      22           0 : class HeapCopyOfStackArray
      23             : {
      24             : public:
      25             :   template<size_t N>
      26           0 :   MOZ_IMPLICIT HeapCopyOfStackArray(ElemType (&array)[N])
      27             :     : mArrayLength(N)
      28           0 :     , mArrayData(MakeUnique<ElemType[]>(N))
      29             :   {
      30           0 :     memcpy(mArrayData.get(), &array[0], N * sizeof(ElemType));
      31           0 :   }
      32             : 
      33           0 :   ElemType* Data() const { return mArrayData.get(); }
      34             :   size_t ArrayLength() const { return mArrayLength; }
      35           0 :   size_t ByteLength() const { return mArrayLength * sizeof(ElemType); }
      36             : 
      37             : private:
      38             :   HeapCopyOfStackArray() = delete;
      39             :   HeapCopyOfStackArray(const HeapCopyOfStackArray&) = delete;
      40             : 
      41             :   const size_t mArrayLength;
      42             :   UniquePtr<ElemType[]> const mArrayData;
      43             : };
      44             : 
      45             : } // namespace mozilla
      46             : 
      47             : #endif // HEAPCOPYOFSTACKARRAY_H_