michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef gfx_SharedDIB_h__
michael@0: #define gfx_SharedDIB_h__
michael@0: 
michael@0: #include "base/shared_memory.h"
michael@0: #include "nscore.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace gfx {
michael@0: 
michael@0: class SharedDIB
michael@0: {
michael@0: public:
michael@0:   typedef base::SharedMemoryHandle Handle;
michael@0: 
michael@0: public:
michael@0:   SharedDIB();
michael@0:   ~SharedDIB();
michael@0: 
michael@0:   // Create and allocate a new shared dib.
michael@0:   nsresult Create(uint32_t aSize);
michael@0: 
michael@0:   // Destroy or release resources associated with this dib.
michael@0:   nsresult Close();
michael@0: 
michael@0:   // Returns true if this object contains a valid dib.
michael@0:   bool IsValid();
michael@0: 
michael@0:   // Wrap a new shared dib around allocated shared memory. Note aHandle must point
michael@0:   // to a memory section large enough to hold a dib of size aSize, otherwise this
michael@0:   // will fail.
michael@0:   nsresult Attach(Handle aHandle, uint32_t aSize);
michael@0: 
michael@0:   // Returns a SharedMemoryHandle suitable for sharing with another process.
michael@0:   nsresult ShareToProcess(base::ProcessHandle aChildProcess, Handle *aChildHandle);
michael@0: 
michael@0: protected:
michael@0:   base::SharedMemory *mShMem;
michael@0: };
michael@0: 
michael@0: } // gfx
michael@0: } // mozilla
michael@0: 
michael@0: #endif