webkit/src/WebCore/css/CSSImageValue.cpp

/*
 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "CSSImageValue.h"

#include "CSSValueKeywords.h"
#include "Cache.h"
#include "CachedImage.h"
#include "DocLoader.h"
#include "RenderStyle.h"
#include "StyleCachedImage.h"

namespace WebCore {

CSSImageValue::CSSImageValue(const String& url)
    : CSSPrimitiveValue(url, CSS_URI)
    , m_accessedImage(false)
{
}

CSSImageValue::CSSImageValue()
    : CSSPrimitiveValue(CSSValueNone)
    , m_accessedImage(true)
{
}

CSSImageValue::~CSSImageValue()
{
    if (m_image)
        m_image->cachedImage()->removeClient(this);
}

StyleCachedImage* CSSImageValue::cachedImage(DocLoader* loader)
{
    return cachedImage(loader, getStringValue());
}

StyleCachedImage* CSSImageValue::cachedImage(DocLoader* loader, const String& url)
{
    if (!m_accessedImage) {
        m_accessedImage = true;

        CachedImage* cachedImage = 0;
        if (loader)
            cachedImage = loader->requestImage(url);
        else {
            // FIXME: Should find a way to make these images sit in their own memory partition, since they are user agent images.
            cachedImage = static_cast<CachedImage*>(cache()->requestResource(0, CachedResource::ImageResource, KURL(ParsedURLString, url), String()));
        }

        if (cachedImage) {
            cachedImage->addClient(this);
            m_image = StyleCachedImage::create(cachedImage);
        }
    }
    
    return m_image.get();
}

String CSSImageValue::cachedImageURL()
{
    if (!m_image)
        return String();
    return m_image->cachedImage()->url();
}

void CSSImageValue::clearCachedImage()
{
    if (m_image)
        m_image->cachedImage()->removeClient(this);
    m_image = 0;
    m_accessedImage = false;
}

} // namespace WebCore