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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2010 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.
*/
#include "config.h"
#include "core/html/HTMLImageLoader.h"
#include "core/HTMLNames.h"
#include "core/dom/Element.h"
#include "core/events/Event.h"
#include "core/fetch/ImageResource.h"
#include "core/html/HTMLImageElement.h"
#include "core/html/HTMLInputElement.h"
#include "core/html/HTMLObjectElement.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "platform/Logging.h"
namespace blink {
using namespace HTMLNames;
HTMLImageLoader::HTMLImageLoader(Element* element)
: ImageLoader(element)
, m_loadFallbackContentTimer(this, &HTMLImageLoader::timerFired)
{
}
HTMLImageLoader::~HTMLImageLoader()
{
}
void HTMLImageLoader::dispatchLoadEvent()
{
WTF_LOG(Timers, "HTMLImageLoader::dispatchLoadEvent %p", this);
// HTMLVideoElement uses this class to load the poster image, but it should not fire events for loading or failure.
if (isHTMLVideoElement(*element()))
return;
bool errorOccurred = image()->errorOccurred();
if (isHTMLObjectElement(*element()) && !errorOccurred)
errorOccurred = (image()->response().httpStatusCode() >= 400); // An <object> considers a 404 to be an error and should fire onerror.
element()->dispatchEvent(Event::create(errorOccurred ? EventTypeNames::error : EventTypeNames::load));
}
String HTMLImageLoader::sourceURI(const AtomicString& attr) const
{
return stripLeadingAndTrailingHTMLSpaces(attr);
}
static void loadFallbackContentForElement(Element* element)
{
if (isHTMLImageElement(element))
toHTMLImageElement(element)->ensureFallbackContent();
else if (isHTMLInputElement(element))
toHTMLInputElement(element)->ensureFallbackContent();
}
void HTMLImageLoader::noImageResourceToLoad()
{
// FIXME: Use fallback content even when there is no alt-text. The only blocker is the large amount of rebaselining it requires.
if (!toHTMLElement(element())->altText().isEmpty())
loadFallbackContentForElement(element());
}
void HTMLImageLoader::notifyFinished(Resource*)
{
ImageResource* cachedImage = image();
RefPtrWillBeRawPtr<Element> element = this->element();
ImageLoader::notifyFinished(cachedImage);
bool loadError = cachedImage->errorOccurred() || cachedImage->response().httpStatusCode() >= 400;
if (isHTMLImageElement(*element)) {
if (loadError)
ensureFallbackContent();
else
toHTMLImageElement(element)->ensurePrimaryContent();
}
if (isHTMLInputElement(*element)) {
if (loadError)
ensureFallbackContent();
else
toHTMLInputElement(element)->ensurePrimaryContent();
}
if (loadError && isHTMLObjectElement(*element))
toHTMLObjectElement(element)->renderFallbackContent();
}
void HTMLImageLoader::ensureFallbackContent()
{
if (image()->url().protocolIsData())
m_loadFallbackContentTimer.startOneShot(0, FROM_HERE);
else
loadFallbackContentForElement(element());
}
void HTMLImageLoader::timerFired(Timer<HTMLImageLoader>*)
{
loadFallbackContentForElement(element());
}
}
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