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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "core/css/CSSImageSetValue.h"
#include "core/FetchInitiatorTypeNames.h"
#include "core/css/CSSImageValue.h"
#include "core/css/CSSPrimitiveValue.h"
#include "core/dom/Document.h"
#include "core/fetch/FetchRequest.h"
#include "core/fetch/ImageResource.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/rendering/style/StyleFetchedImageSet.h"
#include "core/rendering/style/StylePendingImage.h"
#include "wtf/text/StringBuilder.h"
namespace WebCore {
CSSImageSetValue::CSSImageSetValue()
: CSSValueList(ImageSetClass, CommaSeparator)
, m_accessedBestFitImage(false)
, m_scaleFactor(1)
{
}
CSSImageSetValue::~CSSImageSetValue()
{
if (m_imageSet && m_imageSet->isImageResourceSet())
toStyleFetchedImageSet(m_imageSet)->clearImageSetValue();
}
void CSSImageSetValue::fillImageSet()
{
size_t length = this->length();
size_t i = 0;
while (i < length) {
CSSImageValue* imageValue = toCSSImageValue(item(i));
String imageURL = imageValue->url();
++i;
ASSERT_WITH_SECURITY_IMPLICATION(i < length);
CSSValue* scaleFactorValue = item(i);
float scaleFactor = toCSSPrimitiveValue(scaleFactorValue)->getFloatValue();
ImageWithScale image;
image.imageURL = imageURL;
image.referrer = imageValue->referrer();
image.scaleFactor = scaleFactor;
m_imagesInSet.append(image);
++i;
}
// Sort the images so that they are stored in order from lowest resolution to highest.
std::sort(m_imagesInSet.begin(), m_imagesInSet.end(), CSSImageSetValue::compareByScaleFactor);
}
CSSImageSetValue::ImageWithScale CSSImageSetValue::bestImageForScaleFactor()
{
ImageWithScale image;
size_t numberOfImages = m_imagesInSet.size();
for (size_t i = 0; i < numberOfImages; ++i) {
image = m_imagesInSet.at(i);
if (image.scaleFactor >= m_scaleFactor)
return image;
}
return image;
}
StyleFetchedImageSet* CSSImageSetValue::cachedImageSet(ResourceFetcher* loader, float deviceScaleFactor, const ResourceLoaderOptions& options)
{
ASSERT(loader);
m_scaleFactor = deviceScaleFactor;
if (!m_imagesInSet.size())
fillImageSet();
if (!m_accessedBestFitImage) {
// FIXME: In the future, we want to take much more than deviceScaleFactor into acount here.
// All forms of scale should be included: Page::pageScaleFactor(), LocalFrame::pageZoomFactor(),
// and any CSS transforms. https://bugs.webkit.org/show_bug.cgi?id=81698
ImageWithScale image = bestImageForScaleFactor();
if (Document* document = loader->document()) {
FetchRequest request(ResourceRequest(document->completeURL(image.imageURL)), FetchInitiatorTypeNames::css, options);
request.mutableResourceRequest().setHTTPReferrer(image.referrer);
if (options.corsEnabled == IsCORSEnabled)
request.setCrossOriginAccessControl(loader->document()->securityOrigin(), options.allowCredentials, options.credentialsRequested);
if (ResourcePtr<ImageResource> cachedImage = loader->fetchImage(request)) {
m_imageSet = StyleFetchedImageSet::create(cachedImage.get(), image.scaleFactor, this);
m_accessedBestFitImage = true;
}
}
}
return (m_imageSet && m_imageSet->isImageResourceSet()) ? toStyleFetchedImageSet(m_imageSet) : 0;
}
StyleFetchedImageSet* CSSImageSetValue::cachedImageSet(ResourceFetcher* fetcher, float deviceScaleFactor)
{
return cachedImageSet(fetcher, deviceScaleFactor, ResourceFetcher::defaultResourceOptions());
}
StyleImage* CSSImageSetValue::cachedOrPendingImageSet(float deviceScaleFactor)
{
if (!m_imageSet) {
m_imageSet = StylePendingImage::create(this);
} else if (!m_imageSet->isPendingImage()) {
// If the deviceScaleFactor has changed, we may not have the best image loaded, so we have to re-assess.
if (deviceScaleFactor != m_scaleFactor) {
m_accessedBestFitImage = false;
m_imageSet = StylePendingImage::create(this);
}
}
return m_imageSet.get();
}
String CSSImageSetValue::customCSSText() const
{
StringBuilder result;
result.append("-webkit-image-set(");
size_t length = this->length();
size_t i = 0;
while (i < length) {
if (i > 0)
result.append(", ");
const CSSValue* imageValue = item(i);
result.append(imageValue->cssText());
result.append(' ');
++i;
ASSERT_WITH_SECURITY_IMPLICATION(i < length);
const CSSValue* scaleFactorValue = item(i);
result.append(scaleFactorValue->cssText());
// FIXME: Eventually the scale factor should contain it's own unit http://wkb.ug/100120.
// For now 'x' is hard-coded in the parser, so we hard-code it here too.
result.append('x');
++i;
}
result.append(")");
return result.toString();
}
bool CSSImageSetValue::hasFailedOrCanceledSubresources() const
{
if (!m_imageSet || !m_imageSet->isImageResourceSet())
return false;
if (Resource* cachedResource = toStyleFetchedImageSet(m_imageSet)->cachedImage())
return cachedResource->loadFailedOrCanceled();
return true;
}
CSSImageSetValue::CSSImageSetValue(const CSSImageSetValue& cloneFrom)
: CSSValueList(cloneFrom)
, m_accessedBestFitImage(false)
, m_scaleFactor(1)
{
// Non-CSSValueList data is not accessible through CSS OM, no need to clone.
}
PassRefPtrWillBeRawPtr<CSSImageSetValue> CSSImageSetValue::cloneForCSSOM() const
{
return adoptRefWillBeNoop(new CSSImageSetValue(*this));
}
} // namespace WebCore
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