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/*
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* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
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* (C) 1999 Antti Koivisto (koivisto@kde.org)
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* Copyright (C) 2004, 2005, 2006, 2007, 2009 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "ImageLoader.h"
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#include "CSSHelper.h"
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#include "CachedImage.h"
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#include "DocLoader.h"
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#include "Document.h"
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#include "Element.h"
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#include "RenderImage.h"
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namespace WebCore {
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class ImageEventSender {
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public:
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ImageEventSender(const AtomicString& eventType);
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void dispatchEventSoon(ImageLoader*);
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void cancelEvent(ImageLoader*);
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void dispatchPendingEvents();
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private:
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void timerFired(Timer<ImageEventSender>*);
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AtomicString m_eventType;
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Timer<ImageEventSender> m_timer;
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Vector<ImageLoader*> m_dispatchSoonList;
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Vector<ImageLoader*> m_dispatchingList;
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};
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static ImageEventSender& beforeLoadEventSender()
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{
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DEFINE_STATIC_LOCAL(ImageEventSender, sender, (eventNames().beforeloadEvent));
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return sender;
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}
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static ImageEventSender& loadEventSender()
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{
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DEFINE_STATIC_LOCAL(ImageEventSender, sender, (eventNames().loadEvent));
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return sender;
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}
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ImageLoader::ImageLoader(Element* element)
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: m_element(element)
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, m_image(0)
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, m_firedBeforeLoad(true)
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, m_firedLoad(true)
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, m_imageComplete(true)
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, m_loadManually(false)
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{
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}
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ImageLoader::~ImageLoader()
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{
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if (m_image)
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m_image->removeClient(this);
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if (!m_firedBeforeLoad)
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beforeLoadEventSender().cancelEvent(this);
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if (!m_firedLoad)
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loadEventSender().cancelEvent(this);
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}
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void ImageLoader::setImage(CachedImage* newImage)
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{
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ASSERT(m_failedLoadURL.isEmpty());
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CachedImage* oldImage = m_image.get();
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if (newImage != oldImage) {
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setLoadingImage(newImage);
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m_firedBeforeLoad = true;
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m_firedLoad = true;
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m_imageComplete = true;
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if (newImage)
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newImage->addClient(this);
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if (oldImage)
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oldImage->removeClient(this);
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}
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if (RenderObject* renderer = m_element->renderer()) {
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if (!renderer->isImage())
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return;
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toRenderImage(renderer)->resetAnimation();
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}
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}
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void ImageLoader::setLoadingImage(CachedImage* loadingImage)
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{
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m_image = loadingImage;
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m_firedBeforeLoad = !loadingImage;
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m_firedLoad = !loadingImage;
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m_imageComplete = !loadingImage;
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}
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void ImageLoader::updateFromElement()
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{
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// If we're not making renderers for the page, then don't load images. We don't want to slow
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// down the raw HTML parsing case by loading images we don't intend to display.
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Document* document = m_element->document();
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if (!document->renderer())
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return;
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AtomicString attr = m_element->getAttribute(m_element->imageSourceAttributeName());
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if (attr == m_failedLoadURL)
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return;
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// Do not load any image if the 'src' attribute is missing or if it is
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// an empty string referring to a local file. The latter condition is
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// a quirk that preserves old behavior that Dashboard widgets
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// need (<rdar://problem/5994621>).
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CachedImage* newImage = 0;
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if (!(attr.isNull() || (attr.isEmpty() && document->baseURI().isLocalFile()))) {
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if (m_loadManually) {
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document->docLoader()->setAutoLoadImages(false);
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newImage = new CachedImage(sourceURI(attr));
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newImage->setLoading(true);
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newImage->setDocLoader(document->docLoader());
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document->docLoader()->m_documentResources.set(newImage->url(), newImage);
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} else
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newImage = document->docLoader()->requestImage(sourceURI(attr));
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// If we do not have an image here, it means that a cross-site
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// violation occurred.
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m_failedLoadURL = !newImage ? attr : AtomicString();
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}
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CachedImage* oldImage = m_image.get();
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if (newImage != oldImage) {
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setLoadingImage(newImage);
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if (newImage) {
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newImage->addClient(this);
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if (!m_element->document()->hasListenerType(Document::BEFORELOAD_LISTENER))
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dispatchPendingBeforeLoadEvent();
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else
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beforeLoadEventSender().dispatchEventSoon(this);
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}
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if (oldImage)
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oldImage->removeClient(this);
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}
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if (RenderObject* renderer = m_element->renderer()) {
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if (!renderer->isImage())
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return;
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toRenderImage(renderer)->resetAnimation();
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}
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}
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void ImageLoader::updateFromElementIgnoringPreviousError()
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{
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// Clear previous error.
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m_failedLoadURL = AtomicString();
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updateFromElement();
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}
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void ImageLoader::notifyFinished(CachedResource*)
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{
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ASSERT(m_failedLoadURL.isEmpty());
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m_imageComplete = true;
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if (haveFiredBeforeLoadEvent())
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updateRenderer();
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loadEventSender().dispatchEventSoon(this);
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}
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void ImageLoader::updateRenderer()
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{
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if (RenderObject* renderer = m_element->renderer()) {
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if (!renderer->isImage())
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return;
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RenderImage* imageRenderer = toRenderImage(renderer);
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// Only update the renderer if it doesn't have an image or if what we have
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// is a complete image. This prevents flickering in the case where a dynamic
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// change is happening between two images.
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CachedImage* cachedImage = imageRenderer->cachedImage();
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if (m_image != cachedImage && (m_imageComplete || !imageRenderer->cachedImage()))
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imageRenderer->setCachedImage(m_image.get());
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}
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}
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void ImageLoader::dispatchPendingBeforeLoadEvent()
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{
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if (m_firedBeforeLoad)
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return;
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if (!m_image)
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return;
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if (!m_element->document()->attached())
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return;
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m_firedBeforeLoad = true;
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if (m_element->dispatchBeforeLoadEvent(m_image->url())) {
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updateRenderer();
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return;
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}
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if (m_image) {
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m_image->removeClient(this);
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m_image = 0;
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}
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loadEventSender().cancelEvent(this);
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}
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void ImageLoader::dispatchPendingLoadEvent()
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{
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if (m_firedLoad)
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return;
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if (!m_image)
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return;
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if (!m_element->document()->attached())
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return;
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m_firedLoad = true;
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dispatchLoadEvent();
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}
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void ImageLoader::dispatchPendingEvents()
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{
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beforeLoadEventSender().dispatchPendingEvents();
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loadEventSender().dispatchPendingEvents();
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}
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ImageEventSender::ImageEventSender(const AtomicString& eventType)
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: m_eventType(eventType)
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, m_timer(this, &ImageEventSender::timerFired)
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{
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}
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void ImageEventSender::dispatchEventSoon(ImageLoader* loader)
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{
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m_dispatchSoonList.append(loader);
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if (!m_timer.isActive())
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m_timer.startOneShot(0);
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}
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void ImageEventSender::cancelEvent(ImageLoader* loader)
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{
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// Remove instances of this loader from both lists.
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// Use loops because we allow multiple instances to get into the lists.
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size_t size = m_dispatchSoonList.size();
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for (size_t i = 0; i < size; ++i) {
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if (m_dispatchSoonList[i] == loader)
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m_dispatchSoonList[i] = 0;
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}
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size = m_dispatchingList.size();
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for (size_t i = 0; i < size; ++i) {
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if (m_dispatchingList[i] == loader)
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m_dispatchingList[i] = 0;
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}
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if (m_dispatchSoonList.isEmpty())
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m_timer.stop();
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}
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void ImageEventSender::dispatchPendingEvents()
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{
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// Need to avoid re-entering this function; if new dispatches are
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// scheduled before the parent finishes processing the list, they
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// will set a timer and eventually be processed.
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if (!m_dispatchingList.isEmpty())
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return;
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m_timer.stop();
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m_dispatchingList.swap(m_dispatchSoonList);
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size_t size = m_dispatchingList.size();
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for (size_t i = 0; i < size; ++i) {
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if (ImageLoader* loader = m_dispatchingList[i]) {
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if (m_eventType == eventNames().beforeloadEvent)
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loader->dispatchPendingBeforeLoadEvent();
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else
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loader->dispatchPendingLoadEvent();
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}
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}
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m_dispatchingList.clear();
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}
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void ImageEventSender::timerFired(Timer<ImageEventSender>*)
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{
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dispatchPendingEvents();
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}
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}
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