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/*
* Copyright (C) 2008 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 CSSImageGeneratorValue_h
#define CSSImageGeneratorValue_h
#include "core/CoreExport.h"
#include "core/css/CSSValue.h"
#include "platform/geometry/IntSizeHash.h"
#include "platform/heap/SelfKeepAlive.h"
#include "wtf/HashCountedSet.h"
#include "wtf/RefPtr.h"
namespace blink {
class Document;
class Image;
class LayoutObject;
class FloatSize;
struct SizeAndCount {
DISALLOW_NEW();
SizeAndCount(IntSize newSize = IntSize(), int newCount = 0)
: size(newSize), count(newCount) {}
IntSize size;
int count;
};
using LayoutObjectSizeCountMap = HashMap<const LayoutObject*, SizeAndCount>;
class CORE_EXPORT CSSImageGeneratorValue : public CSSValue {
public:
~CSSImageGeneratorValue();
void addClient(const LayoutObject*, const IntSize&);
void removeClient(const LayoutObject*);
PassRefPtr<Image> image(const LayoutObject&, const IntSize&, float zoom);
bool isFixedSize() const;
IntSize fixedSize(const LayoutObject&, const FloatSize& defaultObjectSize);
bool isPending() const;
bool knownToBeOpaque(const LayoutObject&) const;
void loadSubimages(const Document&);
CSSImageGeneratorValue* valueWithURLsMadeAbsolute();
DEFINE_INLINE_TRACE_AFTER_DISPATCH() {
CSSValue::traceAfterDispatch(visitor);
}
protected:
explicit CSSImageGeneratorValue(ClassType);
Image* getImage(const LayoutObject*, const IntSize&);
void putImage(const IntSize&, PassRefPtr<Image>);
const LayoutObjectSizeCountMap& clients() const { return m_clients; }
HashCountedSet<IntSize>
m_sizes; // A count of how many times a given image size is in use.
LayoutObjectSizeCountMap
m_clients; // A map from LayoutObjects (with entry count) to image sizes.
HashMap<IntSize, RefPtr<Image>>
m_images; // A cache of Image objects by image size.
// TODO(Oilpan): when/if we can make the layoutObject point directly to the
// CSSImageGenerator value using a member we don't need to have this hack
// where we keep a persistent to the instance as long as there are clients in
// the LayoutObjectSizeCountMap.
SelfKeepAlive<CSSImageGeneratorValue> m_keepAlive;
};
DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageGeneratorValue, isImageGeneratorValue());
} // namespace blink
#endif // CSSImageGeneratorValue_h
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