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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 "CSSImageValue.h"
     23 
     24 #include "CSSValueKeywords.h"
     25 #include "MemoryCache.h"
     26 #include "CachedImage.h"
     27 #include "CachedResourceLoader.h"
     28 #include "StyleCachedImage.h"
     29 #include "StylePendingImage.h"
     30 
     31 namespace WebCore {
     32 
     33 CSSImageValue::CSSImageValue(const String& url)
     34     : CSSPrimitiveValue(url, CSS_URI)
     35     , m_accessedImage(false)
     36 {
     37 }
     38 
     39 CSSImageValue::CSSImageValue()
     40     : CSSPrimitiveValue(CSSValueNone)
     41     , m_accessedImage(true)
     42 {
     43 }
     44 
     45 CSSImageValue::~CSSImageValue()
     46 {
     47     if (m_image && m_image->isCachedImage())
     48         static_cast<StyleCachedImage*>(m_image.get())->cachedImage()->removeClient(this);
     49 }
     50 
     51 StyleImage* CSSImageValue::cachedOrPendingImage()
     52 {
     53     if (getIdent() == CSSValueNone)
     54         return 0;
     55 
     56     if (!m_image)
     57         m_image = StylePendingImage::create(this);
     58 
     59     return m_image.get();
     60 }
     61 
     62 StyleCachedImage* CSSImageValue::cachedImage(CachedResourceLoader* loader)
     63 {
     64     return cachedImage(loader, getStringValue());
     65 }
     66 
     67 StyleCachedImage* CSSImageValue::cachedImage(CachedResourceLoader* loader, const String& url)
     68 {
     69     ASSERT(loader);
     70 
     71     if (!m_accessedImage) {
     72         m_accessedImage = true;
     73 
     74         if (CachedImage* cachedImage = loader->requestImage(url)) {
     75             cachedImage->addClient(this);
     76             m_image = StyleCachedImage::create(cachedImage);
     77         }
     78     }
     79 
     80     return (m_image && m_image->isCachedImage()) ? static_cast<StyleCachedImage*>(m_image.get()) : 0;
     81 }
     82 
     83 String CSSImageValue::cachedImageURL()
     84 {
     85     if (!m_image || !m_image->isCachedImage())
     86         return String();
     87     return static_cast<StyleCachedImage*>(m_image.get())->cachedImage()->url();
     88 }
     89 
     90 void CSSImageValue::clearCachedImage()
     91 {
     92     if (m_image && m_image->isCachedImage())
     93         static_cast<StyleCachedImage*>(m_image.get())->cachedImage()->removeClient(this);
     94     m_image = 0;
     95     m_accessedImage = false;
     96 }
     97 
     98 } // namespace WebCore
     99