| /* |
| * 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 |