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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef StylePendingImage_h
     27 #define StylePendingImage_h
     28 
     29 #include "Image.h"
     30 #include "StyleImage.h"
     31 
     32 namespace WebCore {
     33 
     34 // StylePendingImage is a placeholder StyleImage that is entered into the RenderStyle during
     35 // style resolution, in order to avoid loading images that are not referenced by the final style.
     36 // They should never exist in a RenderStyle after it has been returned from the style selector.
     37 
     38 class StylePendingImage : public StyleImage {
     39 public:
     40     static PassRefPtr<StylePendingImage> create(CSSImageValue* value) { return adoptRef(new StylePendingImage(value)); }
     41 
     42     virtual WrappedImagePtr data() const { return m_value; }
     43 
     44     virtual bool isPendingImage() const { return true; }
     45 
     46     virtual PassRefPtr<CSSValue> cssValue() const { return m_value; }
     47     CSSImageValue* cssImageValue() const { return m_value; }
     48 
     49     virtual IntSize imageSize(const RenderObject*, float /*multiplier*/) const { return IntSize(); }
     50     virtual bool imageHasRelativeWidth() const { return false; }
     51     virtual bool imageHasRelativeHeight() const { return false; }
     52     virtual bool usesImageContainerSize() const { return false; }
     53     virtual void setImageContainerSize(const IntSize&) { }
     54     virtual void addClient(RenderObject*) { }
     55     virtual void removeClient(RenderObject*) { }
     56     virtual PassRefPtr<Image> image(RenderObject*, const IntSize&) const
     57     {
     58         ASSERT_NOT_REACHED();
     59         return 0;
     60     }
     61 
     62 private:
     63     StylePendingImage(CSSImageValue* value)
     64         : m_value(value)
     65     {
     66     }
     67 
     68     CSSImageValue* m_value; // Not retained; it owns us.
     69 };
     70 
     71 }
     72 #endif
     73