void ImageLoader::setImageWithoutConsideringPendingLoadEvent(
ImageResource* newImage) {
DCHECK(m_failedLoadURL.isEmpty());
ImageResource* oldImage = m_image.get();
if (newImage != oldImage) {
m_image = newImage;
if (m_hasPendingLoadEvent) {
loadEventSender().cancelEvent(this);
m_hasPendingLoadEvent = false;
}
if (m_hasPendingErrorEvent) {
errorEventSender().cancelEvent(this);
m_hasPendingErrorEvent = false;
}
m_imageComplete = true;
if (newImage) {
newImage->addObserver(this);
}
if (oldImage) {
oldImage->removeObserver(this);
}
}
if (LayoutImageResource* imageResource = layoutImageResource())
imageResource->resetAnimation();
}
void ImageLoader::updateFromElement(UpdateFromElementBehavior updateBehavior,
ReferrerPolicy referrerPolicy) {
AtomicString imageSourceURL = m_element->imageSourceURL();
m_suppressErrorEvents = (updateBehavior == UpdateSizeChanged);
if (updateBehavior == UpdateIgnorePreviousError)
clearFailedLoadURL();
if (!m_failedLoadURL.isEmpty() && imageSourceURL == m_failedLoadURL)
return;
// Prevent the creation of a ResourceLoader (and therefore a network request)
// for ImageDocument loads. In this case, the image contents have already been
// requested as a main resource and ImageDocumentParser will take care of
// funneling the main resource bytes into m_image, so just create an
// ImageResource to be populated later.
if (m_loadingImageDocument && updateBehavior != UpdateForcedReload) {
setImage(
ImageResource::create(imageSourceToKURL(m_element->imageSourceURL())));
m_image->setStatus(Resource::Pending);
return;
}
// If we have a pending task, we have to clear it -- either we're now loading
// immediately, or we need to reset the task's state.
if (m_pendingTask) {
m_pendingTask->clearLoader();
m_pendingTask.reset();
}
KURL url = imageSourceToKURL(imageSourceURL);
if (shouldLoadImmediately(url)) {
doUpdateFromElement(DoNotBypassMainWorldCSP, updateBehavior, url,
referrerPolicy);
return;
}
// Allow the idiom "img.src=''; img.src='.." to clear down the image before an
// asynchronous load completes.
if (imageSourceURL.isEmpty()) {
ImageResource* image = m_image.get();
if (image) {
image->removeObserver(this);
}
m_image = nullptr;
}
// Don't load images for inactive documents. We don't want to slow down the
// raw HTML parsing case by loading images we don't intend to display.
Document& document = m_element->document();
if (document.isActive())
enqueueImageLoadingMicroTask(updateBehavior, referrerPolicy);
}
void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior,
UpdateFromElementBehavior updateBehavior,
const KURL& url,
ReferrerPolicy referrerPolicy) {
// FIXME: According to
// http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content.html#the-img-element:the-img-element-55
// When "update image" is called due to environment changes and the load
// fails, onerror should not be called. That is currently not the case.
//
// We don't need to call clearLoader here: Either we were called from the
// task, or our caller updateFromElement cleared the task's loader (and set
// m_pendingTask to null).
m_pendingTask.reset();
// Make sure to only decrement the count when we exit this function
std::unique_ptr<IncrementLoadEventDelayCount> loadDelayCounter;
loadDelayCounter.swap(m_loadDelayCounter);
Document& document = m_element->document();
if (!document.isActive())
return;
AtomicString imageSourceURL = m_element->imageSourceURL();
ImageResource* newImage = nullptr;
if (!url.isNull()) {
// Unlike raw <img>, we block mixed content inside of <picture> or
// <img srcset>.
ResourceLoaderOptions resourceLoaderOptions =
ResourceFetcher::defaultResourceOptions();
ResourceRequest resourceRequest(url);
if (updateBehavior == UpdateForcedReload) {
resourceRequest.setCachePolicy(WebCachePolicy::BypassingCache);
resourceRequest.setLoFiState(WebURLRequest::LoFiOff);
}
if (referrerPolicy != ReferrerPolicyDefault) {
resourceRequest.setHTTPReferrer(SecurityPolicy::generateReferrer(
referrerPolicy, url, document.outgoingReferrer()));
}
if (isHTMLPictureElement(element()->parentNode()) ||
!element()->fastGetAttribute(HTMLNames::srcsetAttr).isNull())
resourceRequest.setRequestContext(WebURLRequest::RequestContextImageSet);
FetchRequest request(resourceRequest, element()->localName(),
resourceLoaderOptions);
configureRequest(request, bypassBehavior, *m_element,
document.clientHintsPreferences());
newImage = ImageResource::fetch(request, document.fetcher());
if (!newImage && !pageIsBeingDismissed(&document)) {
crossSiteOrCSPViolationOccurred(imageSourceURL);
dispatchErrorEvent();
} else {
clearFailedLoadURL();
}
} else {
if (!imageSourceURL.isNull()) {
// Fire an error event if the url string is not empty, but the KURL is.
dispatchErrorEvent();
}
noImageResourceToLoad();
}
ImageResource* oldImage = m_image.get();
if (updateBehavior == UpdateSizeChanged && m_element->layoutObject() &&
m_element->layoutObject()->isImage() && newImage == oldImage) {
toLayoutImage(m_element->layoutObject())->intrinsicSizeChanged();
} else {
if (m_hasPendingLoadEvent) {
loadEventSender().cancelEvent(this);
m_hasPendingLoadEvent = false;
}
// Cancel error events that belong to the previous load, which is now
// cancelled by changing the src attribute. If newImage is null and
// m_hasPendingErrorEvent is true, we know the error event has been just
// posted by this load and we should not cancel the event.
// FIXME: If both previous load and this one got blocked with an error, we
// can receive one error event instead of two.
if (m_hasPendingErrorEvent && newImage) {
errorEventSender().cancelEvent(this);
m_hasPendingErrorEvent = false;
}
m_image = newImage;
m_hasPendingLoadEvent = newImage;
m_imageComplete = !newImage;
updateLayoutObject();
// If newImage exists and is cached, addObserver() will result in the load
// event being queued to fire. Ensure this happens after beforeload is
// dispatched.
if (newImage) {
newImage->addObserver(this);
}
if (oldImage) {
oldImage->removeObserver(this);
}
}
if (LayoutImageResource* imageResource = layoutImageResource())
imageResource->resetAnimation();
// Only consider updating the protection ref-count of the Element immediately
// before returning from this function as doing so might result in the
// destruction of this ImageLoader.
updatedHasPendingEvent();
}
