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/* -*- Mode: C++; tab-width: 2; 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 gfx_SharedDIB_h__
#define gfx_SharedDIB_h__
#include "base/shared_memory.h"
#include "nscore.h"
namespace mozilla {
namespace gfx {
class SharedDIB
{
public:
typedef base::SharedMemoryHandle Handle;
static const uint32_t kBytesPerPixel = 4;
public:
SharedDIB();
~SharedDIB();
// Create and allocate a new shared dib.
nsresult Create(uint32_t aSize);
// Destroy or release resources associated with this dib.
nsresult Close();
// Returns true if this object contains a valid dib.
bool IsValid();
// Wrap a new shared dib around allocated shared memory. Note aHandle must point
// to a memory section large enough to hold a dib of size aSize, otherwise this
// will fail.
nsresult Attach(Handle aHandle, uint32_t aSize);
// Returns a SharedMemoryHandle suitable for sharing with another process.
nsresult ShareToProcess(base::ProcessId aTargetPid, Handle *aNewHandle);
protected:
base::SharedMemory *mShMem;
};
} // namespace gfx
} // namespace mozilla
#endif
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