void ImageLoader::updateFromElement()
{
// If we're not making renderers for the page, then don't load images. 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->renderer())
return;
AtomicString attr = m_element->imageSourceURL();
if (attr == m_failedLoadURL)
return;
// Do not load any image if the 'src' attribute is missing or if it is
// an empty string.
CachedResourceHandle<CachedImage> newImage = 0;
if (!attr.isNull() && !stripLeadingAndTrailingHTMLSpaces(attr).isEmpty()) {
CachedResourceRequest request(ResourceRequest(document->completeURL(sourceURI(attr))));
request.setInitiator(element());
String crossOriginMode = m_element->fastGetAttribute(HTMLNames::crossoriginAttr);
if (!crossOriginMode.isNull()) {
StoredCredentials allowCredentials = equalIgnoringCase(crossOriginMode, "use-credentials") ? AllowStoredCredentials : DoNotAllowStoredCredentials;
updateRequestForAccessControl(request.mutableResourceRequest(), document->securityOrigin(), allowCredentials);
}
if (m_loadManually) {
bool autoLoadOtherImages = document->cachedResourceLoader()->autoLoadImages();
document->cachedResourceLoader()->setAutoLoadImages(false);
newImage = new CachedImage(request.resourceRequest());
newImage->setLoading(true);
newImage->setOwningCachedResourceLoader(document->cachedResourceLoader());
document->cachedResourceLoader()->m_documentResources.set(newImage->url(), newImage.get());
document->cachedResourceLoader()->setAutoLoadImages(autoLoadOtherImages);
} else
newImage = document->cachedResourceLoader()->requestImage(request);
// If we do not have an image here, it means that a cross-site
// violation occurred, or that the image was blocked via Content
// Security Policy, or the page is being dismissed. Trigger an
// error event if the page is not being dismissed.
if (!newImage && !pageIsBeingDismissed(document)) {
m_failedLoadURL = attr;
m_hasPendingErrorEvent = true;
errorEventSender().dispatchEventSoon(this);
} else
clearFailedLoadURL();
} else if (!attr.isNull()) {
// Fire an error event if the url is empty.
// FIXME: Should we fire this event asynchronoulsy via errorEventSender()?
m_element->dispatchEvent(Event::create(eventNames().errorEvent, false, false));
}
CachedImage* oldImage = m_image.get();
if (newImage != oldImage) {
if (m_hasPendingBeforeLoadEvent) {
beforeLoadEventSender().cancelEvent(this);
m_hasPendingBeforeLoadEvent = false;
}
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_hasPendingBeforeLoadEvent = !m_element->document()->isImageDocument() && newImage;
m_hasPendingLoadEvent = newImage;
m_imageComplete = !newImage;
if (newImage) {
if (!m_element->document()->isImageDocument()) {
if (!m_element->document()->hasListenerType(Document::BEFORELOAD_LISTENER))
dispatchPendingBeforeLoadEvent();
else
beforeLoadEventSender().dispatchEventSoon(this);
} else
updateRenderer();
// If newImage is cached, addClient() will result in the load event
// being queued to fire. Ensure this happens after beforeload is
// dispatched.
newImage->addClient(this);
}
if (oldImage)
oldImage->removeClient(this);
}
if (RenderImageResource* imageResource = renderImageResource())
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();
}
void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior, UpdateFromElementBehavior updateBehavior)
{
// 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.clear();
// Make sure to only decrement the count when we exit this function
OwnPtr<IncrementLoadEventDelayCount> loadDelayCounter;
loadDelayCounter.swap(m_loadDelayCounter);
Document& document = m_element->document();
if (!document.isActive())
return;
AtomicString imageSourceURL = m_element->imageSourceURL();
KURL url = imageSourceToKURL(imageSourceURL);
ResourcePtr<ImageResource> newImage = 0;
RefPtrWillBeRawPtr<Element> protectElement(m_element.get());
if (!url.isNull()) {
// Unlike raw <img>, we block mixed content inside of <picture> or <img srcset>.
ResourceLoaderOptions resourceLoaderOptions = ResourceFetcher::defaultResourceOptions();
ResourceRequest resourceRequest(url);
resourceRequest.setFetchCredentialsMode(WebURLRequest::FetchCredentialsModeSameOrigin);
if (updateBehavior == UpdateForcedReload) {
resourceRequest.setCachePolicy(ResourceRequestCachePolicy::ReloadBypassingCache);
// ImageLoader defers the load of images when in an ImageDocument. Don't defer this load on a forced reload.
m_loadingImageDocument = false;
}
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());
// Prevent the immediate 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 the ImageResource.
if (m_loadingImageDocument) {
request.setDefer(FetchRequest::DeferredByClient);
request.setContentSecurityCheck(DoNotCheckContentSecurityPolicy);
}
newImage = ImageResource::fetch(request, document.fetcher());
if (m_loadingImageDocument && newImage)
newImage->setLoading(true);
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 (newImage != oldImage)
sourceImageChanged();
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, addClient() will result in the load event
// being queued to fire. Ensure this happens after beforeload is dispatched.
if (newImage)
newImage->addClient(this);
if (oldImage)
oldImage->removeClient(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();
}
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();
}
void ImageLoader::doUpdateFromElement(UpdateFromElementBehavior updateBehavior)
{
// 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.clear();
// Make sure to only decrement the count when we exit this function
OwnPtr<IncrementLoadEventDelayCount> loadDelayCounter;
loadDelayCounter.swap(m_loadDelayCounter);
Document& document = m_element->document();
if (!document.isActive())
return;
AtomicString imageSourceURL = m_element->imageSourceURL();
KURL url = imageSourceToKURL(imageSourceURL);
ResourcePtr<ImageResource> newImage = 0;
if (!url.isNull()) {
// Unlike raw <img>, we block mixed content inside of <picture> or <img srcset>.
ResourceLoaderOptions resourceLoaderOptions = ResourceFetcher::defaultResourceOptions();
ResourceRequest resourceRequest(url);
FetchRequest request(ResourceRequest(url), element()->localName(), resourceLoaderOptions);
newImage = document.fetcher()->fetchImage(request);
if (!newImage && !pageIsBeingDismissed(&document))
crossSiteOrCSPViolationOccured(imageSourceURL);
else
clearFailedLoadURL();
} else if (!imageSourceURL.isNull()) {
// Fire an error event if the url string is not empty, but the KURL is.
m_hasPendingErrorEvent = true;
errorEventSender().dispatchEventSoon(this);
}
ImageResource* oldImage = m_image.get();
if (newImage != oldImage) {
sourceImageChanged();
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;
updateRenderer();
// If newImage exists and is cached, addClient() will result in the load event
// being queued to fire. Ensure this happens after beforeload is dispatched.
if (newImage)
newImage->addClient(this);
if (oldImage)
oldImage->removeClient(this);
} else if (updateBehavior == UpdateSizeChanged && m_element->renderer() && m_element->renderer()->isImage()) {
toRenderImage(m_element->renderer())->intrinsicSizeChanged();
}
if (RenderImageResource* imageResource = renderImageResource())
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();
}