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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 "CSSImageSetValue.h"
#if ENABLE(CSS_IMAGE_SET)
#include "CSSImageValue.h"
#include "CSSPrimitiveValue.h"
#include "CachedImage.h"
#include "CachedResourceLoader.h"
#include "Document.h"
#include "Page.h"
#include "StyleCachedImageSet.h"
#include "StylePendingImage.h"
#include "WebCoreMemoryInstrumentation.h"
namespace WebCore {
CSSImageSetValue::CSSImageSetValue()
: CSSValueList(ImageSetClass, CommaSeparator)
, m_accessedBestFitImage(false)
, m_scaleFactor(1)
{
}
CSSImageSetValue::~CSSImageSetValue()
{
}
void CSSImageSetValue::fillImageSet()
{
size_t length = this->length();
size_t i = 0;
while (i < length) {
CSSValue* imageValue = item(i);
ASSERT(imageValue->isImageValue());
String imageURL = static_cast<CSSImageValue*>(imageValue)->url();
++i;
ASSERT(i < length);
CSSValue* scaleFactorValue = item(i);
ASSERT(scaleFactorValue->isPrimitiveValue());
float scaleFactor = static_cast<CSSPrimitiveValue*>(scaleFactorValue)->getFloatValue();
ImageWithScale image;
image.imageURL = imageURL;
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;
}
StyleCachedImageSet* CSSImageSetValue::cachedImageSet(CachedResourceLoader* loader)
{
ASSERT(loader);
Document* document = loader->document();
if (Page* page = document->page())
m_scaleFactor = page->deviceScaleFactor();
else
m_scaleFactor = 1;
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(), Frame::pageZoomFactor(),
// and any CSS transforms. https://bugs.webkit.org/show_bug.cgi?id=81698
ImageWithScale image = bestImageForScaleFactor();
ResourceRequest request(loader->document()->completeURL(image.imageURL));
if (CachedResourceHandle<CachedImage> cachedImage = loader->requestImage(request)) {
m_imageSet = StyleCachedImageSet::create(cachedImage.get(), image.scaleFactor, this);
m_accessedBestFitImage = true;
}
}
return (m_imageSet && m_imageSet->isCachedImageSet()) ? static_cast<StyleCachedImageSet*>(m_imageSet.get()) : 0;
}
StyleImage* CSSImageSetValue::cachedOrPendingImageSet(Document* document)
{
if (!m_imageSet)
m_imageSet = StylePendingImage::create(this);
else if (document && !m_imageSet->isPendingImage()) {
float deviceScaleFactor = 1;
if (Page* page = document->page())
deviceScaleFactor = page->deviceScaleFactor();
// 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
{
return "-webkit-image-set(" + CSSValueList::customCssText() + ")";
}
bool CSSImageSetValue::hasFailedOrCanceledSubresources() const
{
if (!m_imageSet || !m_imageSet->isCachedImageSet())
return false;
CachedResource* cachedResource = static_cast<StyleCachedImageSet*>(m_imageSet.get())->cachedImage();
if (!cachedResource)
return true;
return cachedResource->loadFailedOrCanceled();
}
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.
}
PassRefPtr<CSSImageSetValue> CSSImageSetValue::cloneForCSSOM() const
{
return adoptRef(new CSSImageSetValue(*this));
}
void CSSImageSetValue::reportDescendantMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
CSSValueList::reportDescendantMemoryUsage(memoryObjectInfo);
info.addInstrumentedVector(m_imagesInSet);
}
void CSSImageSetValue::ImageWithScale::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
info.addInstrumentedMember(imageURL);
}
} // namespace WebCore
#endif // ENABLE(CSS_IMAGE_SET)
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