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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2004, 2009 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.
*
*/
#ifndef ImageLoader_h
#define ImageLoader_h
#include "core/CoreExport.h"
#include "core/loader/resource/ImageResource.h"
#include "core/loader/resource/ImageResourceContent.h"
#include "core/loader/resource/ImageResourceObserver.h"
#include "platform/heap/Handle.h"
#include "wtf/HashSet.h"
#include "wtf/WeakPtr.h"
#include "wtf/text/AtomicString.h"
#include <memory>
namespace blink {
class IncrementLoadEventDelayCount;
class Element;
class ImageLoader;
class LayoutImageResource;
template <typename T>
class EventSender;
using ImageEventSender = EventSender<ImageLoader>;
class CORE_EXPORT ImageLoader : public GarbageCollectedFinalized<ImageLoader>,
public ImageResourceObserver {
USING_PRE_FINALIZER(ImageLoader, dispose);
public:
explicit ImageLoader(Element*);
~ImageLoader() override;
DECLARE_TRACE();
enum UpdateFromElementBehavior {
// This should be the update behavior when the element is attached to a
// document, or when DOM mutations trigger a new load. Starts loading if a
// load hasn't already been started.
UpdateNormal,
// This should be the update behavior when the resource was changed (via
// 'src', 'srcset' or 'sizes'). Starts a new load even if a previous load of
// the same resource have failed, to match Firefox's behavior.
// FIXME - Verify that this is the right behavior according to the spec.
UpdateIgnorePreviousError,
// This forces the image to update its intrinsic size, even if the image
// source has not changed.
UpdateSizeChanged,
// This force the image to refetch and reload the image source, even if it
// has not changed.
UpdateForcedReload
};
enum BypassMainWorldBehavior { BypassMainWorldCSP, DoNotBypassMainWorldCSP };
void updateFromElement(UpdateFromElementBehavior = UpdateNormal,
ReferrerPolicy = ReferrerPolicyDefault);
void elementDidMoveToNewDocument();
Element* element() const { return m_element; }
bool imageComplete() const { return m_imageComplete && !m_pendingTask; }
ImageResourceContent* image() const { return m_image.get(); }
ImageResource* imageResourceForImageDocument() const {
return m_imageResourceForImageDocument;
}
// Cancels pending load events, and doesn't dispatch new ones.
void setImage(ImageResourceContent*);
bool isLoadingImageDocument() { return m_loadingImageDocument; }
void setLoadingImageDocument() { m_loadingImageDocument = true; }
bool hasPendingActivity() const {
return m_hasPendingLoadEvent || m_hasPendingErrorEvent || m_pendingTask;
}
bool hasPendingError() const { return m_hasPendingErrorEvent; }
bool hadError() const { return !m_failedLoadURL.isEmpty(); }
void dispatchPendingEvent(ImageEventSender*);
static void dispatchPendingLoadEvents();
static void dispatchPendingErrorEvents();
bool getImageAnimationPolicy(ImageAnimationPolicy&) final;
protected:
void imageNotifyFinished(ImageResourceContent*) override;
private:
class Task;
// Called from the task or from updateFromElement to initiate the load.
void doUpdateFromElement(BypassMainWorldBehavior,
UpdateFromElementBehavior,
const KURL&,
ReferrerPolicy = ReferrerPolicyDefault);
virtual void dispatchLoadEvent() = 0;
virtual void noImageResourceToLoad() {}
void updatedHasPendingEvent();
void dispatchPendingLoadEvent();
void dispatchPendingErrorEvent();
LayoutImageResource* layoutImageResource();
void updateLayoutObject();
void setImageWithoutConsideringPendingLoadEvent(ImageResourceContent*);
void clearFailedLoadURL();
void dispatchErrorEvent();
void crossSiteOrCSPViolationOccurred(AtomicString);
void enqueueImageLoadingMicroTask(UpdateFromElementBehavior, ReferrerPolicy);
void timerFired(TimerBase*);
KURL imageSourceToKURL(AtomicString) const;
// Used to determine whether to immediately initiate the load or to schedule a
// microtask.
bool shouldLoadImmediately(const KURL&) const;
// For Oilpan, we must run dispose() as a prefinalizer and call
// m_image->removeClient(this) (and more.) Otherwise, the ImageResource can
// invoke didAddClient() for the ImageLoader that is about to die in the
// current lazy sweeping, and the didAddClient() can access on-heap objects
// that have already been finalized in the current lazy sweeping.
void dispose();
Member<Element> m_element;
Member<ImageResourceContent> m_image;
Member<ImageResource> m_imageResourceForImageDocument;
// FIXME: Oilpan: We might be able to remove this Persistent hack when
// ImageResourceClient is traceable.
GC_PLUGIN_IGNORE("http://crbug.com/383741")
Persistent<Element> m_keepAlive;
TaskRunnerTimer<ImageLoader> m_derefElementTimer;
AtomicString m_failedLoadURL;
WeakPtr<Task> m_pendingTask; // owned by Microtask
std::unique_ptr<IncrementLoadEventDelayCount> m_loadDelayCounter;
bool m_hasPendingLoadEvent : 1;
bool m_hasPendingErrorEvent : 1;
bool m_imageComplete : 1;
bool m_loadingImageDocument : 1;
bool m_elementIsProtected : 1;
bool m_suppressErrorEvents : 1;
};
} // namespace blink
#endif
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