blob: cd7063cdcf041fc63d2eae216312a4089205fef1 [file] [log] [blame]
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2010 Google 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/HTMLImageElement.h"
#include "bindings/v8/ScriptEventListener.h"
#include "core/CSSPropertyNames.h"
#include "core/HTMLNames.h"
#include "core/MediaTypeNames.h"
#include "core/css/MediaQueryMatcher.h"
#include "core/css/MediaValuesCached.h"
#include "core/css/parser/SizesAttributeParser.h"
#include "core/dom/Attribute.h"
#include "core/fetch/ImageResource.h"
#include "core/html/HTMLAnchorElement.h"
#include "core/html/HTMLCanvasElement.h"
#include "core/html/HTMLFormElement.h"
#include "core/html/HTMLSourceElement.h"
#include "core/html/canvas/CanvasRenderingContext.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/html/parser/HTMLSrcsetParser.h"
#include "core/rendering/RenderImage.h"
#include "platform/MIMETypeRegistry.h"
#include "platform/RuntimeEnabledFeatures.h"
namespace WebCore {
using namespace HTMLNames;
HTMLImageElement::HTMLImageElement(Document& document, HTMLFormElement* form, bool createdByParser)
: HTMLElement(imgTag, document)
, m_imageLoader(HTMLImageLoader::create(this))
, m_compositeOperator(CompositeSourceOver)
, m_imageDevicePixelRatio(1.0f)
, m_formWasSetByParser(false)
, m_elementCreatedByParser(createdByParser)
{
ScriptWrappable::init(this);
if (form && form->inDocument()) {
#if ENABLE(OILPAN)
m_form = form;
#else
m_form = form->createWeakPtr();
#endif
m_formWasSetByParser = true;
m_form->associate(*this);
m_form->didAssociateByParser();
}
}
PassRefPtrWillBeRawPtr<HTMLImageElement> HTMLImageElement::create(Document& document)
{
return adoptRefWillBeNoop(new HTMLImageElement(document));
}
PassRefPtrWillBeRawPtr<HTMLImageElement> HTMLImageElement::create(Document& document, HTMLFormElement* form, bool createdByParser)
{
return adoptRefWillBeNoop(new HTMLImageElement(document, form, createdByParser));
}
HTMLImageElement::~HTMLImageElement()
{
#if !ENABLE(OILPAN)
if (m_form)
m_form->disassociate(*this);
#endif
}
void HTMLImageElement::trace(Visitor* visitor)
{
visitor->trace(m_imageLoader);
visitor->trace(m_form);
HTMLElement::trace(visitor);
}
PassRefPtrWillBeRawPtr<HTMLImageElement> HTMLImageElement::createForJSConstructor(Document& document, int width, int height)
{
RefPtrWillBeRawPtr<HTMLImageElement> image = adoptRefWillBeNoop(new HTMLImageElement(document));
if (width)
image->setWidth(width);
if (height)
image->setHeight(height);
image->m_elementCreatedByParser = false;
return image.release();
}
bool HTMLImageElement::isPresentationAttribute(const QualifiedName& name) const
{
if (name == widthAttr || name == heightAttr || name == borderAttr || name == vspaceAttr || name == hspaceAttr || name == alignAttr || name == valignAttr)
return true;
return HTMLElement::isPresentationAttribute(name);
}
void HTMLImageElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
{
if (name == widthAttr)
addHTMLLengthToStyle(style, CSSPropertyWidth, value);
else if (name == heightAttr)
addHTMLLengthToStyle(style, CSSPropertyHeight, value);
else if (name == borderAttr)
applyBorderAttributeToStyle(value, style);
else if (name == vspaceAttr) {
addHTMLLengthToStyle(style, CSSPropertyMarginTop, value);
addHTMLLengthToStyle(style, CSSPropertyMarginBottom, value);
} else if (name == hspaceAttr) {
addHTMLLengthToStyle(style, CSSPropertyMarginLeft, value);
addHTMLLengthToStyle(style, CSSPropertyMarginRight, value);
} else if (name == alignAttr)
applyAlignmentAttributeToStyle(value, style);
else if (name == valignAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyVerticalAlign, value);
else
HTMLElement::collectStyleForPresentationAttribute(name, value, style);
}
const AtomicString HTMLImageElement::imageSourceURL() const
{
return m_bestFitImageURL.isNull() ? fastGetAttribute(srcAttr) : m_bestFitImageURL;
}
HTMLFormElement* HTMLImageElement::formOwner() const
{
return m_form.get();
}
void HTMLImageElement::formRemovedFromTree(const Node& formRoot)
{
ASSERT(m_form);
if (highestAncestorOrSelf() != formRoot)
resetFormOwner();
}
void HTMLImageElement::resetFormOwner()
{
m_formWasSetByParser = false;
HTMLFormElement* nearestForm = findFormAncestor();
if (m_form) {
if (nearestForm == m_form.get())
return;
m_form->disassociate(*this);
}
if (nearestForm) {
#if ENABLE(OILPAN)
m_form = nearestForm;
#else
m_form = nearestForm->createWeakPtr();
#endif
m_form->associate(*this);
} else {
#if ENABLE(OILPAN)
m_form = nullptr;
#else
m_form = WeakPtr<HTMLFormElement>();
#endif
}
}
void HTMLImageElement::setBestFitURLAndDPRFromImageCandidate(const ImageCandidate& candidate)
{
m_bestFitImageURL = candidate.url();
float candidateDensity = candidate.density();
if (candidateDensity >= 0)
m_imageDevicePixelRatio = 1.0 / candidateDensity;
if (renderer() && renderer()->isImage())
toRenderImage(renderer())->setImageDevicePixelRatio(m_imageDevicePixelRatio);
}
void HTMLImageElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
if (name == altAttr) {
if (renderer() && renderer()->isImage())
toRenderImage(renderer())->updateAltText();
} else if (name == srcAttr || name == srcsetAttr || name == sizesAttr) {
selectSourceURL(UpdateIgnorePreviousError);
} else if (name == usemapAttr) {
setIsLink(!value.isNull());
} else if (name == compositeAttr) {
// FIXME: images don't support blend modes in their compositing attribute.
blink::WebBlendMode blendOp = blink::WebBlendModeNormal;
if (!parseCompositeAndBlendOperator(value, m_compositeOperator, blendOp))
m_compositeOperator = CompositeSourceOver;
} else {
HTMLElement::parseAttribute(name, value);
}
}
const AtomicString& HTMLImageElement::altText() const
{
// lets figure out the alt text.. magic stuff
// http://www.w3.org/TR/1998/REC-html40-19980424/appendix/notes.html#altgen
// also heavily discussed by Hixie on bugzilla
const AtomicString& alt = fastGetAttribute(altAttr);
if (!alt.isNull())
return alt;
// fall back to title attribute
return fastGetAttribute(titleAttr);
}
static bool supportedImageType(const String& type)
{
return MIMETypeRegistry::isSupportedImageResourceMIMEType(type);
}
// http://picture.responsiveimages.org/#update-source-set
ImageCandidate HTMLImageElement::findBestFitImageFromPictureParent()
{
ASSERT(isMainThread());
Node* parent = parentNode();
if (!parent || !isHTMLPictureElement(*parent))
return ImageCandidate();
for (Node* child = parent->firstChild(); child; child = child->nextSibling()) {
if (child == this)
return ImageCandidate();
if (!isHTMLSourceElement(*child))
continue;
HTMLSourceElement* source = toHTMLSourceElement(child);
String srcset = source->fastGetAttribute(srcsetAttr);
if (srcset.isEmpty())
continue;
String type = source->fastGetAttribute(typeAttr);
if (!type.isEmpty() && !supportedImageType(type))
continue;
String media = source->fastGetAttribute(mediaAttr);
if (!media.isEmpty()) {
RefPtrWillBeRawPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media);
if (!document().mediaQueryMatcher().evaluate(mediaQueries.get()))
continue;
}
unsigned effectiveSize = SizesAttributeParser::findEffectiveSize(source->fastGetAttribute(sizesAttr), MediaValuesCached::create(document()));
ImageCandidate candidate = bestFitSourceForSrcsetAttribute(document().devicePixelRatio(), effectiveSize, source->fastGetAttribute(srcsetAttr));
if (candidate.isEmpty())
continue;
return candidate;
}
return ImageCandidate();
}
RenderObject* HTMLImageElement::createRenderer(RenderStyle* style)
{
if (style->hasContent())
return RenderObject::createObject(this, style);
RenderImage* image = new RenderImage(this);
image->setImageResource(RenderImageResource::create());
image->setImageDevicePixelRatio(m_imageDevicePixelRatio);
return image;
}
bool HTMLImageElement::canStartSelection() const
{
if (shadow())
return HTMLElement::canStartSelection();
return false;
}
void HTMLImageElement::attach(const AttachContext& context)
{
HTMLElement::attach(context);
if (renderer() && renderer()->isImage()) {
RenderImage* renderImage = toRenderImage(renderer());
RenderImageResource* renderImageResource = renderImage->imageResource();
if (renderImageResource->hasImage())
return;
// If we have no image at all because we have no src attribute, set
// image height and width for the alt text instead.
if (!imageLoader().image() && !renderImageResource->cachedImage())
renderImage->setImageSizeForAltText();
else
renderImageResource->setImageResource(imageLoader().image());
}
}
Node::InsertionNotificationRequest HTMLImageElement::insertedInto(ContainerNode* insertionPoint)
{
if (!m_formWasSetByParser || insertionPoint->highestAncestorOrSelf() != m_form->highestAncestorOrSelf())
resetFormOwner();
bool imageWasModified = false;
if (RuntimeEnabledFeatures::pictureEnabled()) {
ImageCandidate candidate = findBestFitImageFromPictureParent();
if (!candidate.isEmpty()) {
setBestFitURLAndDPRFromImageCandidate(candidate);
imageWasModified = true;
}
}
// If we have been inserted from a renderer-less document,
// our loader may have not fetched the image, so do it now.
if ((insertionPoint->inDocument() && !imageLoader().image()) || imageWasModified)
imageLoader().updateFromElement(m_elementCreatedByParser ? ImageLoader::ForceLoadImmediately : ImageLoader::LoadNormally);
return HTMLElement::insertedInto(insertionPoint);
}
void HTMLImageElement::removedFrom(ContainerNode* insertionPoint)
{
if (!m_form || m_form->highestAncestorOrSelf() != highestAncestorOrSelf())
resetFormOwner();
HTMLElement::removedFrom(insertionPoint);
}
int HTMLImageElement::width(bool ignorePendingStylesheets)
{
if (!renderer()) {
// check the attribute first for an explicit pixel value
bool ok;
int width = getAttribute(widthAttr).toInt(&ok);
if (ok)
return width;
// if the image is available, use its width
if (imageLoader().image())
return imageLoader().image()->imageSizeForRenderer(renderer(), 1.0f).width();
}
if (ignorePendingStylesheets)
document().updateLayoutIgnorePendingStylesheets();
else
document().updateLayout();
RenderBox* box = renderBox();
return box ? adjustForAbsoluteZoom(box->contentBoxRect().pixelSnappedWidth(), box) : 0;
}
int HTMLImageElement::height(bool ignorePendingStylesheets)
{
if (!renderer()) {
// check the attribute first for an explicit pixel value
bool ok;
int height = getAttribute(heightAttr).toInt(&ok);
if (ok)
return height;
// if the image is available, use its height
if (imageLoader().image())
return imageLoader().image()->imageSizeForRenderer(renderer(), 1.0f).height();
}
if (ignorePendingStylesheets)
document().updateLayoutIgnorePendingStylesheets();
else
document().updateLayout();
RenderBox* box = renderBox();
return box ? adjustForAbsoluteZoom(box->contentBoxRect().pixelSnappedHeight(), box) : 0;
}
int HTMLImageElement::naturalWidth() const
{
if (!imageLoader().image())
return 0;
return imageLoader().image()->imageSizeForRenderer(renderer(), 1.0f).width();
}
int HTMLImageElement::naturalHeight() const
{
if (!imageLoader().image())
return 0;
return imageLoader().image()->imageSizeForRenderer(renderer(), 1.0f).height();
}
const String& HTMLImageElement::currentSrc() const
{
// http://www.whatwg.org/specs/web-apps/current-work/multipage/edits.html#dom-img-currentsrc
// The currentSrc IDL attribute must return the img element's current request's current URL.
// Initially, the pending request turns into current request when it is either available or broken.
// We use the image's dimensions as a proxy to it being in any of these states.
if (!imageLoader().image() || !imageLoader().image()->image() || !imageLoader().image()->image()->width())
return emptyAtom;
return imageLoader().image()->url().string();
}
bool HTMLImageElement::isURLAttribute(const Attribute& attribute) const
{
return attribute.name() == srcAttr
|| attribute.name() == lowsrcAttr
|| attribute.name() == longdescAttr
|| (attribute.name() == usemapAttr && attribute.value().string()[0] != '#')
|| HTMLElement::isURLAttribute(attribute);
}
bool HTMLImageElement::hasLegalLinkAttribute(const QualifiedName& name) const
{
return name == srcAttr || HTMLElement::hasLegalLinkAttribute(name);
}
const QualifiedName& HTMLImageElement::subResourceAttributeName() const
{
return srcAttr;
}
const AtomicString& HTMLImageElement::alt() const
{
return fastGetAttribute(altAttr);
}
bool HTMLImageElement::draggable() const
{
// Image elements are draggable by default.
return !equalIgnoringCase(getAttribute(draggableAttr), "false");
}
void HTMLImageElement::setHeight(int value)
{
setIntegralAttribute(heightAttr, value);
}
KURL HTMLImageElement::src() const
{
return document().completeURL(getAttribute(srcAttr));
}
void HTMLImageElement::setSrc(const String& value)
{
setAttribute(srcAttr, AtomicString(value));
}
void HTMLImageElement::setWidth(int value)
{
setIntegralAttribute(widthAttr, value);
}
int HTMLImageElement::x() const
{
RenderObject* r = renderer();
if (!r)
return 0;
// FIXME: This doesn't work correctly with transforms.
FloatPoint absPos = r->localToAbsolute();
return absPos.x();
}
int HTMLImageElement::y() const
{
RenderObject* r = renderer();
if (!r)
return 0;
// FIXME: This doesn't work correctly with transforms.
FloatPoint absPos = r->localToAbsolute();
return absPos.y();
}
bool HTMLImageElement::complete() const
{
return imageLoader().imageComplete();
}
void HTMLImageElement::didMoveToNewDocument(Document& oldDocument)
{
imageLoader().elementDidMoveToNewDocument();
HTMLElement::didMoveToNewDocument(oldDocument);
}
bool HTMLImageElement::isServerMap() const
{
if (!fastHasAttribute(ismapAttr))
return false;
const AtomicString& usemap = fastGetAttribute(usemapAttr);
// If the usemap attribute starts with '#', it refers to a map element in the document.
if (usemap.string()[0] == '#')
return false;
return document().completeURL(stripLeadingAndTrailingHTMLSpaces(usemap)).isEmpty();
}
Image* HTMLImageElement::imageContents()
{
if (!imageLoader().imageComplete())
return 0;
return imageLoader().image()->image();
}
bool HTMLImageElement::isInteractiveContent() const
{
return fastHasAttribute(usemapAttr);
}
PassRefPtr<Image> HTMLImageElement::getSourceImageForCanvas(SourceImageMode, SourceImageStatus* status) const
{
if (!complete() || !cachedImage()) {
*status = IncompleteSourceImageStatus;
return nullptr;
}
if (cachedImage()->errorOccurred()) {
*status = UndecodableSourceImageStatus;
return nullptr;
}
RefPtr<Image> sourceImage = cachedImage()->imageForRenderer(renderer());
// We need to synthesize a container size if a renderer is not available to provide one.
if (!renderer() && sourceImage->usesContainerSize())
sourceImage->setContainerSize(sourceImage->size());
*status = NormalSourceImageStatus;
return sourceImage.release();
}
bool HTMLImageElement::wouldTaintOrigin(SecurityOrigin* destinationSecurityOrigin) const
{
ImageResource* image = cachedImage();
if (!image)
return false;
return !image->isAccessAllowed(destinationSecurityOrigin);
}
FloatSize HTMLImageElement::sourceSize() const
{
ImageResource* image = cachedImage();
if (!image)
return FloatSize();
LayoutSize size;
size = image->imageSizeForRenderer(renderer(), 1.0f); // FIXME: Not sure about this.
return size;
}
FloatSize HTMLImageElement::defaultDestinationSize() const
{
ImageResource* image = cachedImage();
if (!image)
return FloatSize();
LayoutSize size;
size = image->imageSizeForRenderer(renderer(), 1.0f); // FIXME: Not sure about this.
if (renderer() && renderer()->isRenderImage() && image->image() && !image->image()->hasRelativeWidth())
size.scale(toRenderImage(renderer())->imageDevicePixelRatio());
return size;
}
void HTMLImageElement::selectSourceURL(UpdateFromElementBehavior behavior)
{
bool foundURL = false;
if (RuntimeEnabledFeatures::pictureEnabled()) {
ImageCandidate candidate = findBestFitImageFromPictureParent();
if (!candidate.isEmpty()) {
setBestFitURLAndDPRFromImageCandidate(candidate);
foundURL = true;
}
}
if (!foundURL) {
unsigned effectiveSize = 0;
if (RuntimeEnabledFeatures::pictureSizesEnabled())
effectiveSize = SizesAttributeParser::findEffectiveSize(fastGetAttribute(sizesAttr), MediaValuesCached::create(document()));
ImageCandidate candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), effectiveSize, fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr));
setBestFitURLAndDPRFromImageCandidate(candidate);
}
if (behavior == UpdateIgnorePreviousError)
imageLoader().updateFromElementIgnoringPreviousError();
else
imageLoader().updateFromElement();
}
const KURL& HTMLImageElement::sourceURL() const
{
return cachedImage()->response().url();
}
}