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      1 /*
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2005, 2006, 2008 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 #include "config.h"
     22 #include "core/css/CSSImageValue.h"
     23 
     24 #include "core/FetchInitiatorTypeNames.h"
     25 #include "core/css/CSSMarkup.h"
     26 #include "core/dom/Document.h"
     27 #include "core/fetch/CrossOriginAccessControl.h"
     28 #include "core/fetch/FetchRequest.h"
     29 #include "core/fetch/ImageResource.h"
     30 #include "core/rendering/style/StyleFetchedImage.h"
     31 #include "core/rendering/style/StylePendingImage.h"
     32 #include "platform/weborigin/KURL.h"
     33 
     34 namespace WebCore {
     35 
     36 CSSImageValue::CSSImageValue(const String& rawValue, const KURL& url, StyleImage* image)
     37     : CSSValue(ImageClass)
     38     , m_relativeURL(rawValue)
     39     , m_absoluteURL(url.string())
     40     , m_image(image)
     41     , m_accessedImage(image)
     42 {
     43 }
     44 
     45 CSSImageValue::~CSSImageValue()
     46 {
     47 }
     48 
     49 StyleImage* CSSImageValue::cachedOrPendingImage()
     50 {
     51     if (!m_image)
     52         m_image = StylePendingImage::create(this);
     53 
     54     return m_image.get();
     55 }
     56 
     57 StyleFetchedImage* CSSImageValue::cachedImage(ResourceFetcher* fetcher, const ResourceLoaderOptions& options)
     58 {
     59     ASSERT(fetcher);
     60 
     61     if (!m_accessedImage) {
     62         m_accessedImage = true;
     63 
     64         FetchRequest request(ResourceRequest(m_absoluteURL), m_initiatorName.isEmpty() ? FetchInitiatorTypeNames::css : m_initiatorName, options);
     65         request.mutableResourceRequest().setHTTPReferrer(m_referrer);
     66 
     67         if (options.corsEnabled == IsCORSEnabled)
     68             request.setCrossOriginAccessControl(fetcher->document()->securityOrigin(), options.allowCredentials, options.credentialsRequested);
     69 
     70         if (ResourcePtr<ImageResource> cachedImage = fetcher->fetchImage(request))
     71             m_image = StyleFetchedImage::create(cachedImage.get());
     72     }
     73 
     74     return (m_image && m_image->isImageResource()) ? toStyleFetchedImage(m_image) : 0;
     75 }
     76 
     77 void CSSImageValue::restoreCachedResourceIfNeeded(Document& document)
     78 {
     79     if (!m_accessedImage || !m_image->isImageResource() || !document.fetcher())
     80         return;
     81     if (document.fetcher()->cachedResource(KURL(ParsedURLString, m_absoluteURL)))
     82         return;
     83 
     84     ImageResource* resource = m_image->cachedImage();
     85     if (!resource)
     86         return;
     87 
     88     FetchRequest request(ResourceRequest(m_absoluteURL), m_initiatorName.isEmpty() ? FetchInitiatorTypeNames::css : m_initiatorName, resource->options());
     89     document.fetcher()->requestLoadStarted(resource, request, ResourceFetcher::ResourceLoadingFromCache);
     90 }
     91 
     92 bool CSSImageValue::hasFailedOrCanceledSubresources() const
     93 {
     94     if (!m_image || !m_image->isImageResource())
     95         return false;
     96     if (Resource* cachedResource = toStyleFetchedImage(m_image)->cachedImage())
     97         return cachedResource->loadFailedOrCanceled();
     98     return true;
     99 }
    100 
    101 bool CSSImageValue::equals(const CSSImageValue& other) const
    102 {
    103     return m_absoluteURL == other.m_absoluteURL;
    104 }
    105 
    106 String CSSImageValue::customCSSText() const
    107 {
    108     return "url(" + quoteCSSURLIfNeeded(m_absoluteURL) + ")";
    109 }
    110 
    111 PassRefPtrWillBeRawPtr<CSSValue> CSSImageValue::cloneForCSSOM() const
    112 {
    113     // NOTE: We expose CSSImageValues as URI primitive values in CSSOM to maintain old behavior.
    114     RefPtrWillBeRawPtr<CSSPrimitiveValue> uriValue = CSSPrimitiveValue::create(m_absoluteURL, CSSPrimitiveValue::CSS_URI);
    115     uriValue->setCSSOMSafe();
    116     return uriValue.release();
    117 }
    118 
    119 bool CSSImageValue::knownToBeOpaque(const RenderObject* renderer) const
    120 {
    121     return m_image ? m_image->knownToBeOpaque(renderer) : false;
    122 }
    123 
    124 void CSSImageValue::traceAfterDispatch(Visitor* visitor)
    125 {
    126     CSSValue::traceAfterDispatch(visitor);
    127 }
    128 
    129 void CSSImageValue::reResolveURL(const Document& document)
    130 {
    131     KURL url = document.completeURL(m_relativeURL);
    132     if (url == m_absoluteURL)
    133         return;
    134     m_absoluteURL = url.string();
    135     m_accessedImage = false;
    136     m_image.clear();
    137 }
    138 
    139 } // namespace WebCore
    140