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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/fetch/ImageResource.h"
#include "core/fetch/ImageResourceClient.h"
#include "core/fetch/ResourcePtr.h"
#include "platform/heap/Handle.h"
#include "wtf/HashSet.h"
#include "wtf/WeakPtr.h"
#include "wtf/text/AtomicString.h"
namespace WebCore {
class IncrementLoadEventDelayCount;
class ImageLoaderClient : public WillBeGarbageCollectedMixin {
public:
virtual void notifyImageSourceChanged() = 0;
// Determines whether the observed ImageResource should have higher priority in the decoded resources cache.
virtual bool requestsHighLiveResourceCachePriority() { return false; }
virtual void trace(Visitor*) { }
protected:
ImageLoaderClient() { }
};
class Element;
class ImageLoader;
class RenderImageResource;
template<typename T> class EventSender;
typedef EventSender<ImageLoader> ImageEventSender;
class ImageLoader : public NoBaseWillBeGarbageCollectedFinalized<ImageLoader>, public ImageResourceClient {
public:
explicit ImageLoader(Element*);
virtual ~ImageLoader();
void trace(Visitor*);
enum LoadType {
LoadNormally,
ForceLoadImmediately
};
// This function should be called when the element is attached to a document; starts
// loading if a load hasn't already been started.
void updateFromElement(LoadType = LoadNormally);
// This function should be called whenever the 'src' attribute is set, even if its value
// doesn't change; starts new load unconditionally (matches Firefox and Opera behavior).
void updateFromElementIgnoringPreviousError();
void elementDidMoveToNewDocument();
Element* element() const { return m_element; }
bool imageComplete() const
{
return m_imageComplete && !m_pendingTask;
}
ImageResource* image() const { return m_image.get(); }
void setImage(ImageResource*); // Cancels pending load events, and doesn't dispatch new ones.
void setLoadManually(bool loadManually) { m_loadManually = loadManually; }
bool hasPendingActivity() const
{
return m_hasPendingLoadEvent || m_hasPendingErrorEvent || m_pendingTask;
}
void dispatchPendingEvent(ImageEventSender*);
static void dispatchPendingLoadEvents();
static void dispatchPendingErrorEvents();
void addClient(ImageLoaderClient*);
void removeClient(ImageLoaderClient*);
protected:
virtual void notifyFinished(Resource*) OVERRIDE;
private:
class Task;
// Called from the task or from updateFromElement to initiate the load.
void doUpdateFromElement(bool bypassMainWorldCSP = false);
virtual void dispatchLoadEvent() = 0;
virtual String sourceURI(const AtomicString&) const = 0;
void updatedHasPendingEvent();
void dispatchPendingLoadEvent();
void dispatchPendingErrorEvent();
RenderImageResource* renderImageResource();
void updateRenderer();
void setImageWithoutConsideringPendingLoadEvent(ImageResource*);
void sourceImageChanged();
void clearFailedLoadURL();
void timerFired(Timer<ImageLoader>*);
KURL imageURL() const;
// Used to determine whether to immediately initiate the load
// or to schedule a microtask.
bool shouldLoadImmediately(const KURL&) const;
void willRemoveClient(ImageLoaderClient&);
RawPtrWillBeMember<Element> m_element;
ResourcePtr<ImageResource> m_image;
// FIXME: Oilpan: We might be able to remove this Persistent hack when
// ImageResourceClient is traceable.
GC_PLUGIN_IGNORE("http://crbug.com/383741")
RefPtrWillBePersistent<Element> m_keepAlive;
#if ENABLE(OILPAN)
class ImageLoaderClientRemover {
public:
ImageLoaderClientRemover(ImageLoader& loader, ImageLoaderClient& client) : m_loader(loader), m_client(client) { }
~ImageLoaderClientRemover();
private:
ImageLoader& m_loader;
ImageLoaderClient& m_client;
};
friend class ImageLoaderClientRemover;
// Oilpan: This ImageLoader object must outlive its clients because they
// need to call ImageLoader::willRemoveClient before they
// die. Non-Persistent HeapHashMap doesn't work well because weak processing
// for HeapHashMap is not triggered when both of ImageLoader and
// ImageLoaderClient are unreachable.
GC_PLUGIN_IGNORE("http://crbug.com/383742")
PersistentHeapHashMap<WeakMember<ImageLoaderClient>, OwnPtr<ImageLoaderClientRemover> > m_clients;
#else
HashSet<ImageLoaderClient*> m_clients;
#endif
Timer<ImageLoader> m_derefElementTimer;
AtomicString m_failedLoadURL;
WeakPtr<Task> m_pendingTask; // owned by Microtask
OwnPtr<IncrementLoadEventDelayCount> m_delayLoad;
bool m_hasPendingLoadEvent : 1;
bool m_hasPendingErrorEvent : 1;
bool m_imageComplete : 1;
bool m_loadManually : 1;
bool m_elementIsProtected : 1;
unsigned m_highPriorityClientCount;
};
}
#endif
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