Source/WebCore/css/CSSImageValue.cpp

/*
 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2004-2017 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 "CSSMarkup.h"
#include "CSSPrimitiveValue.h"
#include "CSSValueKeywords.h"
#include "CachedImage.h"
#include "CachedResourceLoader.h"
#include "CachedResourceRequest.h"
#include "CachedResourceRequestInitiators.h"
#include "DeprecatedCSSOMPrimitiveValue.h"
#include "Document.h"
#include "Element.h"

namespace WebCore {

CSSImageValue::CSSImageValue(URL&& url, LoadedFromOpaqueSource loadedFromOpaqueSource)
    : CSSValue(ImageClass)
    , m_url(WTFMove(url))
    , m_accessedImage(false)
    , m_loadedFromOpaqueSource(loadedFromOpaqueSource)
{
}

CSSImageValue::CSSImageValue(CachedImage& image)
    : CSSValue(ImageClass)
    , m_url(image.url())
    , m_cachedImage(&image)
    , m_accessedImage(true)
{
}


CSSImageValue::~CSSImageValue() = default;

bool CSSImageValue::isPending() const
{
    return !m_accessedImage;
}

CachedImage* CSSImageValue::loadImage(CachedResourceLoader& loader, const ResourceLoaderOptions& options)
{
    if (!m_accessedImage) {
        m_accessedImage = true;

        ResourceLoaderOptions loadOptions = options;
        loadOptions.loadedFromOpaqueSource = m_loadedFromOpaqueSource;
        CachedResourceRequest request(ResourceRequest(loader.document()->completeURL(m_url.string())), loadOptions);
        if (m_initiatorName.isEmpty())
            request.setInitiator(cachedResourceRequestInitiators().css);
        else
            request.setInitiator(m_initiatorName);

        if (options.mode == FetchOptions::Mode::Cors) {
            ASSERT(loader.document());
            request.updateForAccessControl(*loader.document());
        }
        m_cachedImage = loader.requestImage(WTFMove(request)).value_or(nullptr);
    }
    return m_cachedImage.get();
}

bool CSSImageValue::traverseSubresources(const WTF::Function<bool (const CachedResource&)>& handler) const
{
    if (!m_cachedImage)
        return false;
    return handler(*m_cachedImage);
}

bool CSSImageValue::equals(const CSSImageValue& other) const
{
    return m_url == other.m_url;
}

String CSSImageValue::customCSSText() const
{
    return serializeURL(m_url);
}

Ref<DeprecatedCSSOMValue> CSSImageValue::createDeprecatedCSSOMWrapper(CSSStyleDeclaration& styleDeclaration) const
{
    // NOTE: We expose CSSImageValues as URI primitive values in CSSOM to maintain old behavior.
    return DeprecatedCSSOMPrimitiveValue::create(CSSPrimitiveValue::create(m_url, CSSPrimitiveValue::CSS_URI), styleDeclaration);
}

bool CSSImageValue::knownToBeOpaque(const RenderElement& renderer) const
{
    if (!m_cachedImage)
        return false;
    return m_cachedImage->currentFrameKnownToBeOpaque(&renderer);
}

} // namespace WebCore