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      1 /*
      2  * Copyright (C) 2012 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. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef StyleFetchedImageSet_h
     27 #define StyleFetchedImageSet_h
     28 
     29 #include "core/fetch/ImageResourceClient.h"
     30 #include "core/fetch/ResourcePtr.h"
     31 #include "core/rendering/style/StyleImage.h"
     32 #include "platform/geometry/LayoutSize.h"
     33 
     34 namespace WebCore {
     35 
     36 class ImageResource;
     37 class CSSImageSetValue;
     38 
     39 // This class keeps one cached image and has access to a set of alternatives.
     40 
     41 class StyleFetchedImageSet FINAL : public StyleImage, private ImageResourceClient {
     42     WTF_MAKE_FAST_ALLOCATED;
     43 public:
     44     static PassRefPtr<StyleFetchedImageSet> create(ImageResource* image, float imageScaleFactor, CSSImageSetValue* value)
     45     {
     46         return adoptRef(new StyleFetchedImageSet(image, imageScaleFactor, value));
     47     }
     48     virtual ~StyleFetchedImageSet();
     49 
     50     virtual PassRefPtrWillBeRawPtr<CSSValue> cssValue() const OVERRIDE;
     51 
     52     // FIXME: This is used by StyleImage for equals comparison, but this implementation
     53     // only looks at the image from the set that we have loaded. I'm not sure if that is
     54     // meaningful enough or not.
     55     virtual WrappedImagePtr data() const OVERRIDE { return m_bestFitImage.get(); }
     56 
     57     void clearImageSetValue() { m_imageSetValue = 0; }
     58 
     59     virtual bool canRender(const RenderObject&, float multiplier) const OVERRIDE;
     60     virtual bool isLoaded() const OVERRIDE;
     61     virtual bool errorOccurred() const OVERRIDE;
     62     virtual LayoutSize imageSize(const RenderObject*, float multiplier) const OVERRIDE;
     63     virtual bool imageHasRelativeWidth() const OVERRIDE;
     64     virtual bool imageHasRelativeHeight() const OVERRIDE;
     65     virtual void computeIntrinsicDimensions(const RenderObject*, Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) OVERRIDE;
     66     virtual bool usesImageContainerSize() const OVERRIDE;
     67     virtual void setContainerSizeForRenderer(const RenderObject*, const IntSize&, float) OVERRIDE;
     68     virtual void addClient(RenderObject*) OVERRIDE;
     69     virtual void removeClient(RenderObject*) OVERRIDE;
     70     virtual PassRefPtr<Image> image(RenderObject*, const IntSize&) const OVERRIDE;
     71     virtual float imageScaleFactor() const OVERRIDE { return m_imageScaleFactor; }
     72     virtual bool knownToBeOpaque(const RenderObject*) const OVERRIDE;
     73     virtual ImageResource* cachedImage() const OVERRIDE { return m_bestFitImage.get(); }
     74 
     75 private:
     76     StyleFetchedImageSet(ImageResource*, float imageScaleFactor, CSSImageSetValue*);
     77 
     78     ResourcePtr<ImageResource> m_bestFitImage;
     79     float m_imageScaleFactor;
     80 
     81     // FIXME: oilpan: Change to RawPtrWillBeMember when moving this class onto oilpan heap.
     82     // Also add "if !ENABLE(OILPAN)" around clearImageSetValue above as well as around its
     83     // caller since it should not be needed once both of the objects are on the heap and
     84     // oilpan is enabled.
     85     CSSImageSetValue* m_imageSetValue; // Not retained; it owns us.
     86 };
     87 
     88 DEFINE_STYLE_IMAGE_TYPE_CASTS(StyleFetchedImageSet, isImageResourceSet());
     89 
     90 } // namespace WebCore
     91 
     92 #endif // StyleFetchedImageSet_h
     93