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      1 /*
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2005, 2006, 2008, 2012 Apple Inc. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #ifndef CSSImageValue_h
     22 #define CSSImageValue_h
     23 
     24 #include "core/css/CSSValue.h"
     25 #include "core/loader/cache/ResourceFetcher.h"
     26 #include "wtf/RefPtr.h"
     27 
     28 namespace WebCore {
     29 
     30 class Element;
     31 class StyleFetchedImage;
     32 class StyleImage;
     33 class RenderObject;
     34 
     35 class CSSImageValue : public CSSValue {
     36 public:
     37     static PassRefPtr<CSSImageValue> create(const String& url) { return adoptRef(new CSSImageValue(url)); }
     38     static PassRefPtr<CSSImageValue> create(const String& url, StyleImage* image) { return adoptRef(new CSSImageValue(url, image)); }
     39     ~CSSImageValue();
     40 
     41     StyleFetchedImage* cachedImage(ResourceFetcher*, const ResourceLoaderOptions&);
     42     StyleFetchedImage* cachedImage(ResourceFetcher* loader) { return cachedImage(loader, ResourceFetcher::defaultResourceOptions()); }
     43     // Returns a StyleFetchedImage if the image is cached already, otherwise a StylePendingImage.
     44     StyleImage* cachedOrPendingImage();
     45 
     46     const String& url() { return m_url; }
     47 
     48     String customCssText() const;
     49 
     50     PassRefPtr<CSSValue> cloneForCSSOM() const;
     51 
     52     bool hasFailedOrCanceledSubresources() const;
     53 
     54     bool equals(const CSSImageValue&) const;
     55 
     56     bool knownToBeOpaque(const RenderObject*) const;
     57 
     58     void setInitiator(const AtomicString& name) { m_initiatorName = name; }
     59 
     60 private:
     61     explicit CSSImageValue(const String& url);
     62     CSSImageValue(const String& url, StyleImage*);
     63 
     64     String m_url;
     65     RefPtr<StyleImage> m_image;
     66     bool m_accessedImage;
     67     AtomicString m_initiatorName;
     68 };
     69 
     70 inline CSSImageValue* toCSSImageValue(CSSValue* value)
     71 {
     72     ASSERT_WITH_SECURITY_IMPLICATION(!value || value->isImageValue());
     73     return static_cast<CSSImageValue*>(value);
     74 }
     75 
     76 inline const CSSImageValue* toCSSImageValue(const CSSValue* value)
     77 {
     78     ASSERT_WITH_SECURITY_IMPLICATION(!value || value->isImageValue());
     79     return static_cast<const CSSImageValue*>(value);
     80 }
     81 
     82 // Catch unneeded cast.
     83 void toCSSImageValue(const CSSImageValue*);
     84 
     85 } // namespace WebCore
     86 
     87 #endif // CSSImageValue_h
     88