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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef BackingStore_h
#define BackingStore_h
#include "SharedMemory.h"
#include <WebCore/IntRect.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class GraphicsContext;
}
namespace WebKit {
class BackingStore : public RefCounted<BackingStore> {
public:
// Create a backing store that uses malloced memory.
static PassRefPtr<BackingStore> create(const WebCore::IntSize&);
// Create a backing store whose backing memory can be shared with another process.
static PassRefPtr<BackingStore> createSharable(const WebCore::IntSize&);
// Create a backing store from a shared memory handle.
static PassRefPtr<BackingStore> create(const WebCore::IntSize&, const SharedMemory::Handle&);
// Create a shared memory handle.
bool createHandle(SharedMemory::Handle&);
~BackingStore();
const WebCore::IntSize& size() const { return m_size; }
WebCore::IntRect bounds() const { return WebCore::IntRect(WebCore::IntPoint(), size()); }
bool resize(const WebCore::IntSize& size);
// Create a graphics context that can be used to paint into the backing store.
PassOwnPtr<WebCore::GraphicsContext> createGraphicsContext();
// Paint the backing store into the given context.
void paint(WebCore::GraphicsContext&, const WebCore::IntPoint& dstPoint, const WebCore::IntRect& srcRect);
bool isBackedBySharedMemory() const { return m_sharedMemory; }
private:
BackingStore(const WebCore::IntSize&, void*);
BackingStore(const WebCore::IntSize&, PassRefPtr<SharedMemory>);
static size_t numBytesForSize(const WebCore::IntSize& size) { return size.width() * size.height() * 4; }
void* data() const;
size_t sizeInBytes() const { return numBytesForSize(m_size); }
WebCore::IntSize m_size;
// If the backing store is backed by shared memory, this points to the shared memory object.
RefPtr<SharedMemory> m_sharedMemory;
// If the backing store is backed by fastMalloced memory, this points to the data.
void* m_data;
};
} // namespace WebKit
#endif // BackingStore_h
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