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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.
*
*/
#pragma once
#include "CachedImageClient.h"
#include "CachedResourceHandle.h"
#include "Element.h"
#include "LoaderMalloc.h"
#include "Timer.h"
#include <wtf/Vector.h>
#include <wtf/text/AtomString.h>
namespace WebCore {
class DeferredPromise;
class Document;
class ImageLoader;
class Page;
class RenderImageResource;
struct ImageCandidate;
template<typename T, typename Counter> class EventSender;
using ImageEventSender = EventSender<ImageLoader, SingleThreadWeakPtrImpl>;
enum class RelevantMutation : bool { No, Yes };
enum class LazyImageLoadState : uint8_t { None, Deferred, LoadImmediately, FullImage };
class ImageLoader : public CachedImageClient {
WTF_MAKE_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(Loader);
WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(ImageLoader);
public:
virtual ~ImageLoader();
void ref() const;
void deref() const;
// 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(RelevantMutation = RelevantMutation::No);
// This function should be called whenever the 'src' attribute is set.
// Starts new load unconditionally (matches Firefox and Opera behavior).
void updateFromElementIgnoringPreviousError(RelevantMutation = RelevantMutation::No);
void updateFromElementIgnoringPreviousErrorToSameValue();
void elementDidMoveToNewDocument(Document&);
Element& element() { return m_element.get(); }
const Element& element() const { return m_element.get(); }
Ref<Element> protectedElement() const { return m_element.get(); }
bool shouldIgnoreCandidateWhenLoadingFromArchive(const ImageCandidate&) const;
bool imageComplete() const { return m_imageComplete; }
CachedImage* image() const { return m_image.get(); }
CachedResourceHandle<CachedImage> protectedImage() const;
void clearImage(); // Cancels pending load events, and doesn't dispatch new ones.
size_t pendingDecodePromisesCountForTesting() const { return m_decodingPromises.size(); }
void decode(Ref<DeferredPromise>&&);
void setLoadManually(bool loadManually) { m_loadManually = loadManually; }
// FIXME: Delete this code. beforeload event no longer exists.
bool hasPendingBeforeLoadEvent() const { return m_hasPendingBeforeLoadEvent; }
bool hasPendingActivity() const;
void dispatchPendingEvent(ImageEventSender*, const AtomString& eventType);
static void dispatchPendingLoadEvents(Page*);
void loadDeferredImage();
bool isDeferred() const { return m_lazyImageLoadState == LazyImageLoadState::Deferred || m_lazyImageLoadState == LazyImageLoadState::LoadImmediately; }
Document& document() { return m_element->document(); }
Ref<Document> protectedDocument() { return m_element->document(); }
protected:
explicit ImageLoader(Element&);
void notifyFinished(CachedResource&, const NetworkLoadMetrics&, LoadWillContinueInAnotherProcess = LoadWillContinueInAnotherProcess::No) override;
private:
void resetLazyImageLoading(Document&);
virtual void dispatchLoadEvent() = 0;
void updatedHasPendingEvent();
void didUpdateCachedImage(RelevantMutation, CachedResourceHandle<CachedImage>&&);
void dispatchPendingBeforeLoadEvent();
void dispatchPendingLoadEvent();
void dispatchPendingErrorEvent();
RenderImageResource* renderImageResource();
void updateRenderer();
void clearImageWithoutConsideringPendingLoadEvent();
void clearFailedLoadURL();
bool hasPendingDecodePromises() const { return !m_decodingPromises.isEmpty(); }
void resolveDecodePromises();
void rejectDecodePromises(ASCIILiteral message);
void decode();
void timerFired();
VisibleInViewportState imageVisibleInViewport(const Document&) const override;
WeakRef<Element, WeakPtrImplWithEventTargetData> m_element;
CachedResourceHandle<CachedImage> m_image;
Timer m_derefElementTimer;
RefPtr<Element> m_protectedElement;
AtomString m_failedLoadURL;
AtomString m_pendingURL;
Vector<RefPtr<DeferredPromise>> m_decodingPromises;
bool m_hasPendingBeforeLoadEvent : 1;
bool m_hasPendingLoadEvent : 1;
bool m_hasPendingErrorEvent : 1;
bool m_imageComplete : 1;
bool m_loadManually : 1;
bool m_elementIsProtected : 1;
LazyImageLoadState m_lazyImageLoadState { LazyImageLoadState::None };
};
}
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