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/*
* Copyright (C) 2011 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.
*/
#include "config.h"
#include "ShareableBitmap.h"
namespace WebKit {
static void derefSharedMemory(void* typelessSharedMemory, const void*, size_t)
{
ASSERT_ARG(typelessSharedMemory, typelessSharedMemory);
// Balanced by leakRef in makeCGImageCopy.
RefPtr<SharedMemory> memory = adoptRef(static_cast<SharedMemory*>(typelessSharedMemory));
}
RetainPtr<CGImageRef> ShareableBitmap::makeCGImageCopy()
{
RetainPtr<CGDataProviderRef> dataProvider;
if (isBackedBySharedMemory()) {
if (RefPtr<SharedMemory> copyOnWriteMemory = m_sharedMemory->createCopyOnWriteCopy(sizeInBytes())) {
RefPtr<SharedMemory> originalMemory = m_sharedMemory.release();
// Writes to originalMemory will affect copyOnWriteMemory (until copyOnWriteMemory is
// written to for the first time), but writes to copyOnWriteMemory will not affect
// originalMemory. So we wrap originalMemory in a CGImage (which will never write to
// it) and use copyOnWriteMemory to back this ShareableBitmap from here on out. That
// way, writes to this ShareableBitmap will not affect the CGImage.
m_sharedMemory = copyOnWriteMemory.release();
dataProvider.adoptCF(CGDataProviderCreateWithData(originalMemory.get(), originalMemory->data(), sizeInBytes(), derefSharedMemory));
// Balanced by adoptRef in derefSharedMemory.
originalMemory.release().leakRef();
}
}
if (!dataProvider) {
// We weren't able to make a copy-on-write copy, so we'll just have to fall back to a
// normal copy (which is more expensive, but the best we can do).
RetainPtr<CFDataRef> cfData(AdoptCF, CFDataCreate(0, static_cast<UInt8*>(data()), sizeInBytes()));
dataProvider.adoptCF(CGDataProviderCreateWithCFData(cfData.get()));
}
ASSERT(dataProvider);
return createCGImage(dataProvider.get());
}
} // namespace WebKit
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