void HTMLImageElement::selectSourceURL(ImageLoader::UpdateFromElementBehavior behavior)
{
if (!document().isActive())
return;
bool foundURL = false;
ImageCandidate candidate = findBestFitImageFromPictureParent();
if (!candidate.isEmpty()) {
setBestFitURLAndDPRFromImageCandidate(candidate);
foundURL = true;
}
if (!foundURL) {
candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), sourceSize(*this), fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr), &document());
setBestFitURLAndDPRFromImageCandidate(candidate);
}
if (m_intrinsicSizingViewportDependant && !m_listener) {
m_listener = ViewportChangeListener::create(this);
document().mediaQueryMatcher().addViewportListener(m_listener);
}
imageLoader().updateFromElement(behavior, m_referrerPolicy);
if (imageLoader().image() || (imageLoader().hasPendingActivity() && !imageSourceURL().isEmpty()))
ensurePrimaryContent();
else
ensureFallbackContent();
}
// http://picture.responsiveimages.org/#update-source-set
ImageCandidate HTMLImageElement::findBestFitImageFromPictureParent()
{
ASSERT(isMainThread());
Node* parent = parentNode();
if (!parent || !isHTMLPictureElement(*parent))
return ImageCandidate();
for (Node* child = parent->firstChild(); child; child = child->nextSibling()) {
if (child == this)
return ImageCandidate();
if (!isHTMLSourceElement(*child))
continue;
HTMLSourceElement* source = toHTMLSourceElement(child);
if (!source->fastGetAttribute(srcAttr).isNull())
UseCounter::countDeprecation(document(), UseCounter::PictureSourceSrc);
String srcset = source->fastGetAttribute(srcsetAttr);
if (srcset.isEmpty())
continue;
String type = source->fastGetAttribute(typeAttr);
if (!type.isEmpty() && !supportedImageType(type))
continue;
if (!source->mediaQueryMatches())
continue;
ImageCandidate candidate = bestFitSourceForSrcsetAttribute(document().devicePixelRatio(), sourceSize(*source), source->fastGetAttribute(srcsetAttr), &document());
if (candidate.isEmpty())
continue;
return candidate;
}
return ImageCandidate();
}
void HTMLImageElement::selectSourceURL(ImageLoader::UpdateFromElementBehavior behavior)
{
if (!document().isActive())
return;
bool foundURL = false;
if (RuntimeEnabledFeatures::pictureEnabled()) {
ImageCandidate candidate = findBestFitImageFromPictureParent();
if (!candidate.isEmpty()) {
setBestFitURLAndDPRFromImageCandidate(candidate);
foundURL = true;
}
}
if (!foundURL) {
float effectiveSize = 0;
if (RuntimeEnabledFeatures::pictureSizesEnabled()) {
String sizes = fastGetAttribute(sizesAttr);
if (!sizes.isNull())
UseCounter::count(document(), UseCounter::Sizes);
SizesAttributeParser parser = SizesAttributeParser(MediaValuesDynamic::create(document()), sizes);
effectiveSize = parser.length();
}
ImageCandidate candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), effectiveSize, fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr), &document());
setBestFitURLAndDPRFromImageCandidate(candidate);
}
if (m_intrinsicSizingViewportDependant && !m_listener) {
m_listener = ViewportChangeListener::create(this);
document().mediaQueryMatcher().addViewportListener(m_listener);
}
imageLoader().updateFromElement(behavior);
}
void processAttributes(const HTMLToken::AttributeList& attributes, Document& document, Vector<bool>& pictureState)
{
ASSERT(isMainThread());
if (m_tagId >= TagId::Unknown)
return;
for (auto& attribute : attributes) {
AtomicString attributeName(attribute.name);
String attributeValue = StringImpl::create8BitIfPossible(attribute.value);
processAttribute(attributeName, attributeValue, document, pictureState);
}
if (m_tagId == TagId::Source && !pictureState.isEmpty() && !pictureState.last() && m_mediaMatched && !m_srcSetAttribute.isEmpty()) {
float sourceSize = parseSizesAttribute(m_sizesAttribute, document.renderView(), document.frame());
ImageCandidate imageCandidate = bestFitSourceForImageAttributes(m_deviceScaleFactor, m_urlToLoad, m_srcSetAttribute, sourceSize);
if (!imageCandidate.isEmpty()) {
pictureState.last() = true;
setUrlToLoad(imageCandidate.string.toString(), true);
}
}
// Resolve between src and srcSet if we have them and the tag is img.
if (m_tagId == TagId::Img && !m_srcSetAttribute.isEmpty()) {
float sourceSize = parseSizesAttribute(m_sizesAttribute, document.renderView(), document.frame());
ImageCandidate imageCandidate = bestFitSourceForImageAttributes(m_deviceScaleFactor, m_urlToLoad, m_srcSetAttribute, sourceSize);
setUrlToLoad(imageCandidate.string.toString(), true);
}
if (m_metaIsViewport && !m_metaContent.isNull())
document.processViewport(m_metaContent, ViewportArguments::ViewportMeta);
}
void HTMLImageElement::selectImageSource()
{
// First look for the best fit source from our <picture> parent if we have one.
ImageCandidate candidate = bestFitSourceFromPictureElement();
if (candidate.isEmpty()) {
// If we don't have a <picture> or didn't find a source, then we use our own attributes.
float sourceSize = parseSizesAttribute(fastGetAttribute(sizesAttr).string(), document().renderView(), document().frame());
candidate = bestFitSourceForImageAttributes(document().deviceScaleFactor(), fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr), sourceSize);
}
setBestFitURLAndDPRFromImageCandidate(candidate);
m_imageLoader.updateFromElementIgnoringPreviousError();
}
String bestFitSourceForImageAttributes(float deviceScaleFactor, unsigned sourceSize, const String& srcAttribute, ImageCandidate& srcsetImageCandidate)
{
if (srcsetImageCandidate.isEmpty())
return srcAttribute;
Vector<ImageCandidate> imageCandidates;
imageCandidates.append(srcsetImageCandidate);
if (!srcAttribute.isEmpty())
imageCandidates.append(ImageCandidate(srcAttribute, 0, srcAttribute.length(), DescriptorParsingResult(), ImageCandidate::SrcOrigin));
return pickBestImageCandidate(deviceScaleFactor, sourceSize, imageCandidates).toString();
}
Node::InsertionNotificationRequest HTMLImageElement::insertedInto(ContainerNode* insertionPoint)
{
if (!m_formWasSetByParser || insertionPoint->highestAncestorOrSelf() != m_form->highestAncestorOrSelf())
resetFormOwner();
bool imageWasModified = false;
if (RuntimeEnabledFeatures::pictureEnabled()) {
ImageCandidate candidate = findBestFitImageFromPictureParent();
if (!candidate.isEmpty()) {
setBestFitURLAndDPRFromImageCandidate(candidate);
imageWasModified = true;
}
}
// If we have been inserted from a renderer-less document,
// our loader may have not fetched the image, so do it now.
if ((insertionPoint->inDocument() && !imageLoader().image()) || imageWasModified)
imageLoader().updateFromElement(m_elementCreatedByParser ? ImageLoader::ForceLoadImmediately : ImageLoader::LoadNormally);
return HTMLElement::insertedInto(insertionPoint);
}
ImageCandidate HTMLImageElement::bestFitSourceFromPictureElement()
{
auto* parent = parentNode();
if (!is<HTMLPictureElement>(parent))
return { };
auto* picture = downcast<HTMLPictureElement>(parent);
picture->clearViewportDependentResults();
document().removeViewportDependentPicture(*picture);
for (Node* child = parent->firstChild(); child && child != this; child = child->nextSibling()) {
if (!is<HTMLSourceElement>(*child))
continue;
auto& source = downcast<HTMLSourceElement>(*child);
auto& srcset = source.fastGetAttribute(srcsetAttr);
if (srcset.isEmpty())
continue;
if (source.hasAttribute(typeAttr)) {
String type = source.fastGetAttribute(typeAttr).string();
int indexOfSemicolon = type.find(';');
if (indexOfSemicolon >= 0)
type.truncate(indexOfSemicolon);
type = stripLeadingAndTrailingHTMLSpaces(type);
type = type.lower();
if (!type.isEmpty() && !MIMETypeRegistry::isSupportedImageMIMEType(type) && type != "image/svg+xml")
continue;
}
MediaQueryEvaluator evaluator(document().printing() ? "print" : "screen", document().frame(), computedStyle());
bool evaluation = evaluator.evalCheckingViewportDependentResults(source.mediaQuerySet(), picture->viewportDependentResults());
if (picture->hasViewportDependentResults())
document().addViewportDependentPicture(*picture);
if (!evaluation)
continue;
float sourceSize = parseSizesAttribute(source.fastGetAttribute(sizesAttr).string(), document().renderView(), document().frame());
ImageCandidate candidate = bestFitSourceForImageAttributes(document().deviceScaleFactor(), nullAtom, source.fastGetAttribute(srcsetAttr), sourceSize);
if (!candidate.isEmpty())
return candidate;
}
return { };
}
Node::InsertionNotificationRequest HTMLImageElement::insertedInto(ContainerNode* insertionPoint)
{
if (!m_formWasSetByParser || NodeTraversal::highestAncestorOrSelf(*insertionPoint) != NodeTraversal::highestAncestorOrSelf(*m_form.get()))
resetFormOwner();
if (m_listener)
document().mediaQueryMatcher().addViewportListener(m_listener);
bool imageWasModified = false;
if (document().isActive()) {
ImageCandidate candidate = findBestFitImageFromPictureParent();
if (!candidate.isEmpty()) {
setBestFitURLAndDPRFromImageCandidate(candidate);
imageWasModified = true;
}
}
// If we have been inserted from a layoutObject-less document,
// our loader may have not fetched the image, so do it now.
if ((insertionPoint->inDocument() && !imageLoader().image()) || imageWasModified)
imageLoader().updateFromElement(ImageLoader::UpdateNormal, m_referrerPolicy);
return HTMLElement::insertedInto(insertionPoint);
}
void HTMLImageElement::selectSourceURL(UpdateFromElementBehavior behavior)
{
bool foundURL = false;
if (RuntimeEnabledFeatures::pictureEnabled()) {
ImageCandidate candidate = findBestFitImageFromPictureParent();
if (!candidate.isEmpty()) {
setBestFitURLAndDPRFromImageCandidate(candidate);
foundURL = true;
}
}
if (!foundURL) {
unsigned effectiveSize = 0;
if (RuntimeEnabledFeatures::pictureSizesEnabled())
effectiveSize = SizesAttributeParser::findEffectiveSize(fastGetAttribute(sizesAttr), MediaValuesCached::create(document()));
ImageCandidate candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), effectiveSize, fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr));
setBestFitURLAndDPRFromImageCandidate(candidate);
}
if (behavior == UpdateIgnorePreviousError)
imageLoader().updateFromElementIgnoringPreviousError();
else
imageLoader().updateFromElement();
}
// http://picture.responsiveimages.org/#update-source-set
ImageCandidate HTMLImageElement::findBestFitImageFromPictureParent()
{
ASSERT(isMainThread());
Node* parent = parentNode();
if (!parent || !isHTMLPictureElement(*parent))
return ImageCandidate();
for (Node* child = parent->firstChild(); child; child = child->nextSibling()) {
if (child == this)
return ImageCandidate();
if (!isHTMLSourceElement(*child))
continue;
HTMLSourceElement* source = toHTMLSourceElement(child);
String srcset = source->fastGetAttribute(srcsetAttr);
if (srcset.isEmpty())
continue;
String type = source->fastGetAttribute(typeAttr);
if (!type.isEmpty() && !supportedImageType(type))
continue;
String media = source->fastGetAttribute(mediaAttr);
if (!media.isEmpty()) {
RefPtrWillBeRawPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media);
if (!document().mediaQueryMatcher().evaluate(mediaQueries.get()))
continue;
}
unsigned effectiveSize = SizesAttributeParser::findEffectiveSize(source->fastGetAttribute(sizesAttr), MediaValuesCached::create(document()));
ImageCandidate candidate = bestFitSourceForSrcsetAttribute(document().devicePixelRatio(), effectiveSize, source->fastGetAttribute(srcsetAttr));
if (candidate.isEmpty())
continue;
return candidate;
}
return ImageCandidate();
}