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/*
* Copyright (C) 2012 Google 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
* 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 ImageDecodingStore_h
#define ImageDecodingStore_h
#include "ScaledImageFragment.h"
#include "SkTypes.h"
#include "SkSize.h"
#include "SkSizeHash.h"
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/ThreadingPrimitives.h>
#include <wtf/Vector.h>
namespace WebCore {
class ImageDecoder;
class ImageFrameGenerator;
class SharedBuffer;
class ImageDecodingStore {
public:
static PassOwnPtr<ImageDecodingStore> create() { return adoptPtr(new ImageDecodingStore); }
~ImageDecodingStore();
static ImageDecodingStore* instance();
static void initializeOnce();
static void shutdown();
const ScaledImageFragment* lockCompleteCache(const ImageFrameGenerator*, const SkISize& scaledSize);
const ScaledImageFragment* lockIncompleteCache(const ImageFrameGenerator*, const SkISize& scaledSize);
void unlockCache(const ImageFrameGenerator*, const ScaledImageFragment*);
const ScaledImageFragment* insertAndLockCache(const ImageFrameGenerator*, PassOwnPtr<ScaledImageFragment>);
private:
struct CacheEntry {
static PassOwnPtr<CacheEntry> create() { return adoptPtr(new CacheEntry()); }
static PassOwnPtr<CacheEntry> createAndUse(PassOwnPtr<ScaledImageFragment> image) { return adoptPtr(new CacheEntry(image, 1)); }
CacheEntry()
: useCount(0)
{
}
CacheEntry(PassOwnPtr<ScaledImageFragment> image, int count)
: cachedImage(image)
, useCount(count)
{
}
~CacheEntry()
{
ASSERT(!useCount);
}
OwnPtr<ScaledImageFragment> cachedImage;
int useCount;
};
ImageDecodingStore();
void prune();
Vector<OwnPtr<CacheEntry> > m_cacheEntries;
typedef std::pair<const ImageFrameGenerator*, SkISize> CacheIdentifier;
typedef HashMap<CacheIdentifier, CacheEntry*> CacheMap;
CacheMap m_cacheMap;
// Protect concurrent access to all instances of CacheEntry stored in m_cacheEntries and
// m_cacheMap as well as the containers.
Mutex m_mutex;
};
} // namespace WebCore
#endif
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