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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CachedDisplayItem_h
#define CachedDisplayItem_h
#include "platform/graphics/paint/DisplayItem.h"
#include "wtf/Assertions.h"
namespace blink {
// A placeholder of DisplayItem in the new paint list of DisplayItemList, to indicate that
// the DisplayItem has not been changed and should be replaced with the cached DisplayItem
// when merging new paint list to cached paint list.
class PLATFORM_EXPORT CachedDisplayItem : public DisplayItem {
public:
static PassOwnPtr<CachedDisplayItem> create(DisplayItemClient client, Type type)
{
return adoptPtr(new CachedDisplayItem(client, type));
}
virtual bool isCached() const { return true; }
private:
CachedDisplayItem(DisplayItemClient client, Type type) : DisplayItem(client, type) { }
// CachedDisplayItem is never replayed or appended to WebDisplayItemList.
virtual void replay(GraphicsContext*) override final { ASSERT_NOT_REACHED(); }
virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override final { ASSERT_NOT_REACHED(); }
#ifndef NDEBUG
virtual const char* name() const override { return "Cached"; }
#endif
};
} // namespace blink
#endif // CachedDisplayItem_h
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