blob: d34c8fb65326a8753b2a9b4fcfbc5701a8c8a4ca [file] [log] [blame]
/*
Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "CachedImage.h"
#include "BitmapImage.h"
#include "CachedImageClient.h"
#include "CachedResourceClient.h"
#include "CachedResourceClientWalker.h"
#include "CachedResourceLoader.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "FrameLoaderTypes.h"
#include "FrameView.h"
#include "MIMETypeRegistry.h"
#include "MemoryCache.h"
#include "RenderElement.h"
#include "SVGElementTypeHelpers.h"
#include "SVGImage.h"
#include "SecurityOrigin.h"
#include "Settings.h"
#include "SharedBuffer.h"
#include "SubresourceLoader.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/StdLibExtras.h>
#if PLATFORM(IOS_FAMILY)
#include "SystemMemory.h"
#endif
#if USE(CG)
#include "PDFDocumentImage.h"
#endif
namespace WebCore {
CachedImage::CachedImage(CachedResourceRequest&& request, PAL::SessionID sessionID, const CookieJar* cookieJar)
: CachedResource(WTFMove(request), Type::ImageResource, sessionID, cookieJar)
, m_updateImageDataCount(0)
, m_isManuallyCached(false)
, m_shouldPaintBrokenImage(true)
, m_forceUpdateImageDataEnabledForTesting(false)
{
setStatus(Unknown);
}
CachedImage::CachedImage(Image* image, PAL::SessionID sessionID, const CookieJar* cookieJar)
: CachedResource(URL(), Type::ImageResource, sessionID, cookieJar)
, m_image(image)
, m_updateImageDataCount(0)
, m_isManuallyCached(false)
, m_shouldPaintBrokenImage(true)
, m_forceUpdateImageDataEnabledForTesting(false)
{
}
CachedImage::CachedImage(const URL& url, Image* image, PAL::SessionID sessionID, const CookieJar* cookieJar, const String& domainForCachePartition)
: CachedResource(url, Type::ImageResource, sessionID, cookieJar)
, m_image(image)
, m_updateImageDataCount(0)
, m_isManuallyCached(true)
, m_shouldPaintBrokenImage(true)
, m_forceUpdateImageDataEnabledForTesting(false)
{
m_resourceRequest.setDomainForCachePartition(domainForCachePartition);
// Use the incoming URL in the response field. This ensures that code using the response directly,
// such as origin checks for security, actually see something.
m_response.setURL(url);
}
CachedImage::~CachedImage()
{
clearImage();
}
void CachedImage::load(CachedResourceLoader& loader)
{
m_skippingRevalidationDocument = loader.document();
if (loader.shouldPerformImageLoad(url()))
CachedResource::load(loader);
else
setLoading(false);
}
void CachedImage::setBodyDataFrom(const CachedResource& resource)
{
ASSERT(resource.type() == type());
const CachedImage& image = static_cast<const CachedImage&>(resource);
CachedResource::setBodyDataFrom(resource);
m_image = image.m_image;
m_imageObserver = image.m_imageObserver;
if (m_imageObserver)
m_imageObserver->cachedImages().add(this);
if (m_image && is<SVGImage>(*m_image))
m_svgImageCache = makeUnique<SVGImageCache>(&downcast<SVGImage>(*m_image));
}
void CachedImage::didAddClient(CachedResourceClient& client)
{
if (m_data && !m_image && !errorOccurred()) {
createImage();
m_image->setData(m_data.copyRef(), true);
}
ASSERT(client.resourceClientType() == CachedImageClient::expectedType());
if (m_image && !m_image->isNull())
static_cast<CachedImageClient&>(client).imageChanged(this);
if (m_image)
m_image->startAnimationAsynchronously();
CachedResource::didAddClient(client);
}
void CachedImage::didRemoveClient(CachedResourceClient& client)
{
ASSERT(client.resourceClientType() == CachedImageClient::expectedType());
m_pendingContainerContextRequests.remove(&static_cast<CachedImageClient&>(client));
m_clientsWaitingForAsyncDecoding.remove(&static_cast<CachedImageClient&>(client));
if (m_svgImageCache)
m_svgImageCache->removeClientFromCache(&static_cast<CachedImageClient&>(client));
CachedResource::didRemoveClient(client);
static_cast<CachedImageClient&>(client).didRemoveCachedImageClient(*this);
}
bool CachedImage::isClientWaitingForAsyncDecoding(CachedImageClient& client) const
{
return m_clientsWaitingForAsyncDecoding.contains(&client);
}
void CachedImage::addClientWaitingForAsyncDecoding(CachedImageClient& client)
{
ASSERT(client.resourceClientType() == CachedImageClient::expectedType());
if (m_clientsWaitingForAsyncDecoding.contains(&client))
return;
if (!m_clients.contains(&client)) {
// If the <html> element does not have its own background specified, painting the root box
// renderer uses the style of the <body> element, see RenderView::rendererForRootBackground().
// In this case, the client we are asked to add is the root box renderer. Since we can't add
// a client to m_clientsWaitingForAsyncDecoding unless it is one of the m_clients, we are going
// to cancel the repaint optimization we do in CachedImage::imageFrameAvailable() by adding
// all the m_clients to m_clientsWaitingForAsyncDecoding.
CachedResourceClientWalker<CachedImageClient> walker(m_clients);
while (auto* client = walker.next())
m_clientsWaitingForAsyncDecoding.add(client);
} else
m_clientsWaitingForAsyncDecoding.add(&client);
}
void CachedImage::removeAllClientsWaitingForAsyncDecoding()
{
if (m_clientsWaitingForAsyncDecoding.isEmpty() || !hasImage() || !is<BitmapImage>(image()))
return;
downcast<BitmapImage>(image())->stopAsyncDecodingQueue();
for (auto* client : m_clientsWaitingForAsyncDecoding)
client->imageChanged(this);
m_clientsWaitingForAsyncDecoding.clear();
}
void CachedImage::switchClientsToRevalidatedResource()
{
ASSERT(is<CachedImage>(resourceToRevalidate()));
// Pending container size requests need to be transferred to the revalidated resource.
if (!m_pendingContainerContextRequests.isEmpty()) {
// A copy of pending size requests is needed as they are deleted during CachedResource::switchClientsToRevalidateResouce().
ContainerContextRequests switchContainerContextRequests;
for (auto& request : m_pendingContainerContextRequests)
switchContainerContextRequests.set(request.key, request.value);
CachedResource::switchClientsToRevalidatedResource();
CachedImage& revalidatedCachedImage = downcast<CachedImage>(*resourceToRevalidate());
for (auto& request : switchContainerContextRequests)
revalidatedCachedImage.setContainerContextForClient(*request.key, request.value.containerSize, request.value.containerZoom, request.value.imageURL);
return;
}
CachedResource::switchClientsToRevalidatedResource();
}
void CachedImage::allClientsRemoved()
{
m_pendingContainerContextRequests.clear();
m_clientsWaitingForAsyncDecoding.clear();
if (m_image && !errorOccurred())
m_image->resetAnimation();
}
std::pair<Image*, float> CachedImage::brokenImage(float deviceScaleFactor) const
{
if (deviceScaleFactor >= 3) {
static NeverDestroyed<Image*> brokenImageVeryHiRes(&Image::loadPlatformResource("missingImage@3x").leakRef());
return std::make_pair(brokenImageVeryHiRes, 3);
}
if (deviceScaleFactor >= 2) {
static NeverDestroyed<Image*> brokenImageHiRes(&Image::loadPlatformResource("missingImage@2x").leakRef());
return std::make_pair(brokenImageHiRes, 2);
}
static NeverDestroyed<Image*> brokenImageLoRes(&Image::loadPlatformResource("missingImage").leakRef());
return std::make_pair(brokenImageLoRes, 1);
}
bool CachedImage::willPaintBrokenImage() const
{
return errorOccurred() && m_shouldPaintBrokenImage;
}
Image* CachedImage::image() const
{
if (errorOccurred() && m_shouldPaintBrokenImage) {
// Returning the 1x broken image is non-ideal, but we cannot reliably access the appropriate
// deviceScaleFactor from here. It is critical that callers use CachedImage::brokenImage()
// when they need the real, deviceScaleFactor-appropriate broken image icon.
return brokenImage(1).first;
}
if (m_image)
return m_image.get();
return &Image::nullImage();
}
Image* CachedImage::imageForRenderer(const RenderObject* renderer)
{
if (errorOccurred() && m_shouldPaintBrokenImage) {
// Returning the 1x broken image is non-ideal, but we cannot reliably access the appropriate
// deviceScaleFactor from here. It is critical that callers use CachedImage::brokenImage()
// when they need the real, deviceScaleFactor-appropriate broken image icon.
return brokenImage(1).first;
}
if (!m_image)
return &Image::nullImage();
if (m_image->drawsSVGImage()) {
Image* image = m_svgImageCache->imageForRenderer(renderer);
if (image != &Image::nullImage())
return image;
}
return m_image.get();
}
bool CachedImage::hasSVGImage() const
{
return image() && image()->isSVGImage();
}
void CachedImage::setContainerContextForClient(const CachedImageClient& client, const LayoutSize& containerSize, float containerZoom, const URL& imageURL)
{
if (containerSize.isEmpty())
return;
ASSERT(containerZoom);
if (!m_image) {
m_pendingContainerContextRequests.set(&client, ContainerContext { containerSize, containerZoom, imageURL });
return;
}
if (!m_image->drawsSVGImage()) {
m_image->setContainerSize(containerSize);
return;
}
m_svgImageCache->setContainerContextForClient(client, containerSize, containerZoom, imageURL);
}
FloatSize CachedImage::imageSizeForRenderer(const RenderElement* renderer, SizeType sizeType) const
{
if (!m_image)
return { };
if (m_image->drawsSVGImage() && sizeType == UsedSize)
return m_svgImageCache->imageSizeForRenderer(renderer);
return m_image->size(renderer ? renderer->imageOrientation() : ImageOrientation(ImageOrientation::FromImage));
}
LayoutSize CachedImage::unclampedImageSizeForRenderer(const RenderElement* renderer, float multiplier, SizeType sizeType) const
{
LayoutSize imageSize = LayoutSize(imageSizeForRenderer(renderer, sizeType));
if (imageSize.isEmpty() || multiplier == 1.0f)
return imageSize;
float widthScale = m_image->hasRelativeWidth() ? 1.0f : multiplier;
float heightScale = m_image->hasRelativeHeight() ? 1.0f : multiplier;
imageSize.scale(widthScale, heightScale);
return imageSize;
}
LayoutSize CachedImage::imageSizeForRenderer(const RenderElement* renderer, float multiplier, SizeType sizeType) const
{
auto imageSize = unclampedImageSizeForRenderer(renderer, multiplier, sizeType);
if (imageSize.isEmpty() || multiplier == 1.0f)
return imageSize;
// Don't let images that have a width/height >= 1 shrink below 1 when zoomed.
LayoutSize minimumSize(imageSize.width() > 0 ? 1 : 0, imageSize.height() > 0 ? 1 : 0);
imageSize.clampToMinimumSize(minimumSize);
ASSERT(multiplier != 1.0f || (imageSize.width().fraction() == 0.0f && imageSize.height().fraction() == 0.0f));
return imageSize;
}
void CachedImage::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
{
if (m_image)
m_image->computeIntrinsicDimensions(intrinsicWidth, intrinsicHeight, intrinsicRatio);
}
void CachedImage::notifyObservers(const IntRect* changeRect)
{
CachedResourceClientWalker<CachedImageClient> w(m_clients);
while (CachedImageClient* c = w.next())
c->imageChanged(this, changeRect);
}
void CachedImage::checkShouldPaintBrokenImage()
{
if (!m_loader || m_loader->reachedTerminalState())
return;
m_shouldPaintBrokenImage = m_loader->frameLoader()->client().shouldPaintBrokenImage(url());
}
bool CachedImage::isPDFResource() const
{
return Image::isPDFResource(m_response.mimeType(), url());
}
bool CachedImage::isPostScriptResource() const
{
return Image::isPostScriptResource(m_response.mimeType(), url());
}
void CachedImage::clear()
{
destroyDecodedData();
clearImage();
m_pendingContainerContextRequests.clear();
m_clientsWaitingForAsyncDecoding.clear();
setEncodedSize(0);
}
inline void CachedImage::createImage()
{
// Create the image if it doesn't yet exist.
if (m_image)
return;
m_imageObserver = CachedImageObserver::create(*this);
m_image = Image::create(*m_imageObserver);
if (m_image) {
if (is<SVGImage>(*m_image))
m_svgImageCache = makeUnique<SVGImageCache>(&downcast<SVGImage>(*m_image));
// Send queued container size requests.
if (m_image->usesContainerSize()) {
for (auto& request : m_pendingContainerContextRequests)
setContainerContextForClient(*request.key, request.value.containerSize, request.value.containerZoom, request.value.imageURL);
}
m_pendingContainerContextRequests.clear();
m_clientsWaitingForAsyncDecoding.clear();
}
}
CachedImage::CachedImageObserver::CachedImageObserver(CachedImage& image)
{
m_cachedImages.add(&image);
}
void CachedImage::CachedImageObserver::encodedDataStatusChanged(const Image& image, EncodedDataStatus status)
{
for (auto cachedImage : m_cachedImages)
cachedImage->encodedDataStatusChanged(image, status);
}
void CachedImage::CachedImageObserver::decodedSizeChanged(const Image& image, long long delta)
{
for (auto cachedImage : m_cachedImages)
cachedImage->decodedSizeChanged(image, delta);
}
void CachedImage::CachedImageObserver::didDraw(const Image& image)
{
for (auto cachedImage : m_cachedImages)
cachedImage->didDraw(image);
}
bool CachedImage::CachedImageObserver::canDestroyDecodedData(const Image& image)
{
for (auto cachedImage : m_cachedImages) {
if (&image != cachedImage->image())
continue;
if (!cachedImage->canDestroyDecodedData(image))
return false;
}
return true;
}
void CachedImage::CachedImageObserver::imageFrameAvailable(const Image& image, ImageAnimatingState animatingState, const IntRect* changeRect, DecodingStatus decodingStatus)
{
for (auto cachedImage : m_cachedImages)
cachedImage->imageFrameAvailable(image, animatingState, changeRect, decodingStatus);
}
void CachedImage::CachedImageObserver::changedInRect(const Image& image, const IntRect* rect)
{
for (auto cachedImage : m_cachedImages)
cachedImage->changedInRect(image, rect);
}
void CachedImage::CachedImageObserver::scheduleRenderingUpdate(const Image& image)
{
for (auto cachedImage : m_cachedImages)
cachedImage->scheduleRenderingUpdate(image);
}
inline void CachedImage::clearImage()
{
if (!m_image)
return;
if (m_imageObserver) {
m_imageObserver->cachedImages().remove(this);
if (m_imageObserver->cachedImages().isEmpty()) {
ASSERT(m_imageObserver->hasOneRef());
m_image->setImageObserver(nullptr);
}
m_imageObserver = nullptr;
}
m_image = nullptr;
m_lastUpdateImageDataTime = { };
m_updateImageDataCount = 0;
}
void CachedImage::updateBufferInternal(const SharedBuffer& data)
{
m_data = data.makeContiguous();
setEncodedSize(m_data->size());
createImage();
// Don't update the image with the new buffer very often. Changing the decoder
// internal data and repainting the observers sometimes are very expensive operations.
if (!m_forceUpdateImageDataEnabledForTesting && shouldDeferUpdateImageData())
return;
EncodedDataStatus encodedDataStatus = EncodedDataStatus::Unknown;
if (isPostScriptResource()) {
#if PLATFORM(MAC) && !USE(WEBKIT_IMAGE_DECODERS)
// Delay updating the image with the PostScript data till all the data
// is received so it can be converted to PDF data.
return;
#else
// Set the encodedDataStatus to Error so loading this image will be canceled.
encodedDataStatus = EncodedDataStatus::Error;
#endif
} else {
// Have the image update its data from its internal buffer. Decoding the image data
// will be delayed until info (like size or specific image frames) are queried which
// usually happens when the observers are repainted.
encodedDataStatus = updateImageData(false);
}
if (encodedDataStatus > EncodedDataStatus::Error && encodedDataStatus < EncodedDataStatus::SizeAvailable)
return;
if (encodedDataStatus == EncodedDataStatus::Error || m_image->isNull()) {
// Image decoding failed. Either we need more image data or the image data is malformed.
error(errorOccurred() ? status() : DecodeError);
if (m_loader && encodedDataStatus == EncodedDataStatus::Error)
m_loader->cancel();
if (inCache())
MemoryCache::singleton().remove(*this);
return;
}
// Tell our observers to try to draw.
notifyObservers();
}
bool CachedImage::shouldDeferUpdateImageData() const
{
static const double updateImageDataBackoffIntervals[] = { 0, 1, 3, 6, 15 };
unsigned interval = m_updateImageDataCount;
// The first time through, the chunk time will be 0 and the image will get an update.
return (MonotonicTime::now() - m_lastUpdateImageDataTime).seconds() < updateImageDataBackoffIntervals[interval];
}
RefPtr<SharedBuffer> CachedImage::convertedDataIfNeeded(const FragmentedSharedBuffer* data) const
{
if (!data)
return nullptr;
if (!isPostScriptResource())
return data->makeContiguous();
#if PLATFORM(MAC) && !USE(WEBKIT_IMAGE_DECODERS)
return SharedBuffer::create(PDFDocumentImage::convertPostScriptDataToPDF(data->makeContiguous()->createCFData()).get());
#else
// Loading the image should have been canceled if the system does not support converting PostScript to PDF.
ASSERT_NOT_REACHED();
return nullptr;
#endif
}
void CachedImage::didUpdateImageData()
{
m_lastUpdateImageDataTime = MonotonicTime::now();
unsigned previous = m_updateImageDataCount;
if (previous != maxUpdateImageDataCount)
m_updateImageDataCount += 1;
}
EncodedDataStatus CachedImage::updateImageData(bool allDataReceived)
{
if (!m_image || !m_data)
return EncodedDataStatus::Error;
EncodedDataStatus result = m_image->setData(m_data.get(), allDataReceived);
didUpdateImageData();
return result;
}
void CachedImage::updateBuffer(const FragmentedSharedBuffer& buffer)
{
ASSERT(dataBufferingPolicy() == DataBufferingPolicy::BufferData);
updateBufferInternal(buffer.makeContiguous());
CachedResource::updateBuffer(buffer);
}
void CachedImage::updateData(const SharedBuffer& data)
{
ASSERT(dataBufferingPolicy() == DataBufferingPolicy::DoNotBufferData);
updateBufferInternal(data);
CachedResource::updateData(data);
}
void CachedImage::finishLoading(const FragmentedSharedBuffer* data, const NetworkLoadMetrics& metrics)
{
m_data = convertedDataIfNeeded(data);
if (m_data) {
setEncodedSize(m_data->size());
createImage();
}
EncodedDataStatus encodedDataStatus = updateImageData(true);
if (encodedDataStatus == EncodedDataStatus::Error || m_image->isNull()) {
// Image decoding failed; the image data is malformed.
error(errorOccurred() ? status() : DecodeError);
if (inCache())
MemoryCache::singleton().remove(*this);
return;
}
setLoading(false);
notifyObservers();
CachedResource::finishLoading(data, metrics);
}
void CachedImage::didReplaceSharedBufferContents()
{
if (m_image) {
// Let the Image know that the FragmentedSharedBuffer has been rejigged, so it can let go of any references to the heap-allocated resource buffer.
// FIXME(rdar://problem/24275617): It would be better if we could somehow tell the Image's decoder to swap in the new contents without destroying anything.
m_image->destroyDecodedData(true);
}
CachedResource::didReplaceSharedBufferContents();
}
void CachedImage::error(CachedResource::Status status)
{
checkShouldPaintBrokenImage();
clear();
CachedResource::error(status);
notifyObservers();
}
void CachedImage::responseReceived(const ResourceResponse& response)
{
if (!m_response.isNull())
clear();
CachedResource::responseReceived(response);
}
void CachedImage::destroyDecodedData()
{
bool canDeleteImage = !m_image || (m_image->hasOneRef() && m_image->isBitmapImage());
if (canDeleteImage && !isLoading() && !hasClients()) {
m_image = nullptr;
setDecodedSize(0);
} else if (m_image && !errorOccurred())
m_image->destroyDecodedData();
}
void CachedImage::encodedDataStatusChanged(const Image& image, EncodedDataStatus)
{
if (&image != m_image)
return;
notifyObservers();
}
void CachedImage::decodedSizeChanged(const Image& image, long long delta)
{
if (&image != m_image)
return;
ASSERT(delta >= 0 || decodedSize() + delta >= 0);
setDecodedSize(static_cast<unsigned>(decodedSize() + delta));
}
void CachedImage::didDraw(const Image& image)
{
if (&image != m_image)
return;
MonotonicTime timeStamp = FrameView::currentPaintTimeStamp();
if (!timeStamp) // If didDraw is called outside of a Frame paint.
timeStamp = MonotonicTime::now();
CachedResource::didAccessDecodedData(timeStamp);
}
bool CachedImage::canDestroyDecodedData(const Image& image)
{
if (&image != m_image)
return false;
CachedResourceClientWalker<CachedImageClient> clientWalker(m_clients);
while (CachedImageClient* client = clientWalker.next()) {
if (!client->canDestroyDecodedData())
return false;
}
return true;
}
void CachedImage::imageFrameAvailable(const Image& image, ImageAnimatingState animatingState, const IntRect* changeRect, DecodingStatus decodingStatus)
{
if (&image != m_image)
return;
CachedResourceClientWalker<CachedImageClient> clientWalker(m_clients);
VisibleInViewportState visibleState = VisibleInViewportState::No;
while (CachedImageClient* client = clientWalker.next()) {
// All the clients of animated images have to be notified. The new frame has to be drawn in all of them.
if (animatingState == ImageAnimatingState::No && !m_clientsWaitingForAsyncDecoding.contains(client))
continue;
if (client->imageFrameAvailable(*this, animatingState, changeRect) == VisibleInViewportState::Yes)
visibleState = VisibleInViewportState::Yes;
}
if (visibleState == VisibleInViewportState::No && animatingState == ImageAnimatingState::Yes)
m_image->stopAnimation();
if (decodingStatus != DecodingStatus::Partial)
m_clientsWaitingForAsyncDecoding.clear();
}
void CachedImage::changedInRect(const Image& image, const IntRect* rect)
{
if (&image != m_image)
return;
notifyObservers(rect);
}
void CachedImage::scheduleRenderingUpdate(const Image& image)
{
if (&image != m_image)
return;
CachedResourceClientWalker<CachedImageClient> walker(m_clients);
while (auto* client = walker.next())
client->scheduleRenderingUpdateForImage(*this);
}
bool CachedImage::currentFrameKnownToBeOpaque(const RenderElement* renderer)
{
Image* image = imageForRenderer(renderer);
return image->currentFrameKnownToBeOpaque();
}
bool CachedImage::isOriginClean(SecurityOrigin* origin)
{
ASSERT_UNUSED(origin, origin);
ASSERT(this->origin());
ASSERT(origin->toString() == this->origin()->toString());
return !loadFailedOrCanceled() && isCORSSameOrigin();
}
CachedResource::RevalidationDecision CachedImage::makeRevalidationDecision(CachePolicy cachePolicy) const
{
if (UNLIKELY(isManuallyCached())) {
// Do not revalidate manually cached images. This mechanism is used as a
// way to efficiently share an image from the client to content and
// the URL for that image may not represent a resource that can be
// retrieved by standard means. If the manual caching SPI is used, it is
// incumbent on the client to only use valid resources.
return RevalidationDecision::No;
}
return CachedResource::makeRevalidationDecision(cachePolicy);
}
bool CachedImage::canSkipRevalidation(const CachedResourceLoader& loader, const CachedResourceRequest& request) const
{
if (options().mode != request.options().mode || options().credentials != request.options().credentials || resourceRequest().allowCookies() != request.resourceRequest().allowCookies())
return false;
// Skip revalidation as per https://html.spec.whatwg.org/#ignore-higher-layer-caching which defines a per-document image list.
// This rule is loosely implemented by other browsers, we could relax it and should update it once memory cache is properly specified.
return m_skippingRevalidationDocument && loader.document() == m_skippingRevalidationDocument;
}
bool CachedImage::isVisibleInViewport(const Document& document) const
{
CachedResourceClientWalker<CachedImageClient> walker(m_clients);
while (auto* client = walker.next()) {
if (client->imageVisibleInViewport(document) == VisibleInViewportState::Yes)
return true;
}
return false;
}
} // namespace WebCore