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/*
* Copyright (C) 2007 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 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 PageCache_h
#define PageCache_h
#include "Timer.h"
#include <wtf/Forward.h>
#include <wtf/HashSet.h>
#include <wtf/Noncopyable.h>
namespace WebCore {
class CachedPage;
class Frame;
class HistoryItem;
class Page;
class PageCache {
WTF_MAKE_NONCOPYABLE(PageCache); WTF_MAKE_FAST_ALLOCATED;
public:
friend PageCache* pageCache();
bool canCache(Page*) const;
void setCapacity(int); // number of pages to cache
int capacity() { return m_capacity; }
void add(PassRefPtr<HistoryItem>, Page*); // Prunes if capacity() is exceeded.
void remove(HistoryItem*);
CachedPage* get(HistoryItem* item);
int pageCount() const { return m_size; }
int frameCount() const;
void markPagesForVistedLinkStyleRecalc();
// Will mark all cached pages associated with the given page as needing style recalc.
void markPagesForFullStyleRecalc(Page*);
#if ENABLE(VIDEO_TRACK)
void markPagesForCaptionPreferencesChanged();
#endif
#if USE(ACCELERATED_COMPOSITING)
bool shouldClearBackingStores() const { return m_shouldClearBackingStores; }
void setShouldClearBackingStores(bool flag) { m_shouldClearBackingStores = flag; }
void markPagesForDeviceScaleChanged(Page*);
#endif
private:
PageCache(); // Use pageCache() instead.
~PageCache(); // Not implemented to make sure nobody accidentally calls delete -- WebCore does not delete singletons.
static bool canCachePageContainingThisFrame(Frame*);
void addToLRUList(HistoryItem*); // Adds to the head of the list.
void removeFromLRUList(HistoryItem*);
void prune();
int m_capacity;
int m_size;
// LRU List
HistoryItem* m_head;
HistoryItem* m_tail;
#if USE(ACCELERATED_COMPOSITING)
bool m_shouldClearBackingStores;
#endif
};
// Function to obtain the global page cache.
PageCache* pageCache();
} // namespace WebCore
#endif // PageCache_h
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