third_party/WebKit/Source/core/svg/SVGImageElement.cpp

/*
 * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Rob Buis <buis@kde.org>
 * Copyright (C) 2006 Alexander Kellett <lypanov@kde.org>
 *
 * 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 "core/svg/SVGImageElement.h"

#include "core/CSSPropertyNames.h"
#include "core/dom/StyleChangeReason.h"
#include "core/layout/LayoutImageResource.h"
#include "core/layout/svg/LayoutSVGImage.h"

namespace blink {

inline SVGImageElement::SVGImageElement(Document& document)
    : SVGGraphicsElement(SVGNames::imageTag, document),
      SVGURIReference(this),
      m_x(SVGAnimatedLength::create(this,
                                    SVGNames::xAttr,
                                    SVGLength::create(SVGLengthMode::Width))),
      m_y(SVGAnimatedLength::create(this,
                                    SVGNames::yAttr,
                                    SVGLength::create(SVGLengthMode::Height))),
      m_width(
          SVGAnimatedLength::create(this,
                                    SVGNames::widthAttr,
                                    SVGLength::create(SVGLengthMode::Width))),
      m_height(
          SVGAnimatedLength::create(this,
                                    SVGNames::heightAttr,
                                    SVGLength::create(SVGLengthMode::Height))),
      m_preserveAspectRatio(SVGAnimatedPreserveAspectRatio::create(
          this,
          SVGNames::preserveAspectRatioAttr,
          SVGPreserveAspectRatio::create())),
      m_imageLoader(SVGImageLoader::create(this)),
      m_needsLoaderURIUpdate(true) {
  addToPropertyMap(m_x);
  addToPropertyMap(m_y);
  addToPropertyMap(m_width);
  addToPropertyMap(m_height);
  addToPropertyMap(m_preserveAspectRatio);
}

DEFINE_NODE_FACTORY(SVGImageElement)

DEFINE_TRACE(SVGImageElement) {
  visitor->trace(m_x);
  visitor->trace(m_y);
  visitor->trace(m_width);
  visitor->trace(m_height);
  visitor->trace(m_preserveAspectRatio);
  visitor->trace(m_imageLoader);
  SVGGraphicsElement::trace(visitor);
  SVGURIReference::trace(visitor);
}

bool SVGImageElement::currentFrameHasSingleSecurityOrigin() const {
  if (LayoutSVGImage* layoutSVGImage = toLayoutSVGImage(layoutObject())) {
    if (layoutSVGImage->imageResource()->hasImage()) {
      if (Image* image =
              layoutSVGImage->imageResource()->cachedImage()->getImage())
        return image->currentFrameHasSingleSecurityOrigin();
    }
  }

  return true;
}

bool SVGImageElement::isPresentationAttribute(
    const QualifiedName& attrName) const {
  if (attrName == SVGNames::xAttr || attrName == SVGNames::yAttr ||
      attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr)
    return true;
  return SVGGraphicsElement::isPresentationAttribute(attrName);
}

bool SVGImageElement::isPresentationAttributeWithSVGDOM(
    const QualifiedName& attrName) const {
  if (attrName == SVGNames::xAttr || attrName == SVGNames::yAttr ||
      attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr)
    return true;
  return SVGGraphicsElement::isPresentationAttributeWithSVGDOM(attrName);
}

void SVGImageElement::collectStyleForPresentationAttribute(
    const QualifiedName& name,
    const AtomicString& value,
    MutableStylePropertySet* style) {
  SVGAnimatedPropertyBase* property = propertyFromAttribute(name);
  if (property == m_width)
    addPropertyToPresentationAttributeStyle(
        style, CSSPropertyWidth,
        m_width->currentValue()->asCSSPrimitiveValue());
  else if (property == m_height)
    addPropertyToPresentationAttributeStyle(
        style, CSSPropertyHeight,
        m_height->currentValue()->asCSSPrimitiveValue());
  else if (property == m_x)
    addPropertyToPresentationAttributeStyle(
        style, CSSPropertyX, m_x->currentValue()->asCSSPrimitiveValue());
  else if (property == m_y)
    addPropertyToPresentationAttributeStyle(
        style, CSSPropertyY, m_y->currentValue()->asCSSPrimitiveValue());
  else
    SVGGraphicsElement::collectStyleForPresentationAttribute(name, value,
                                                             style);
}

void SVGImageElement::svgAttributeChanged(const QualifiedName& attrName) {
  bool isLengthAttribute =
      attrName == SVGNames::xAttr || attrName == SVGNames::yAttr ||
      attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr;

  if (isLengthAttribute || attrName == SVGNames::preserveAspectRatioAttr) {
    SVGElement::InvalidationGuard invalidationGuard(this);

    if (isLengthAttribute) {
      invalidateSVGPresentationAttributeStyle();
      setNeedsStyleRecalc(LocalStyleChange,
                          StyleChangeReasonForTracing::fromAttribute(attrName));
      updateRelativeLengthsInformation();
    }

    LayoutObject* object = this->layoutObject();
    if (!object)
      return;

    // FIXME: if isLengthAttribute then we should avoid this call if the
    // viewport didn't change, however since we don't have the computed
    // style yet we can't use updateBoundingBox/updateImageContainerSize.
    // See http://crbug.com/466200.
    markForLayoutAndParentResourceInvalidation(object);
    return;
  }

  if (SVGURIReference::isKnownAttribute(attrName)) {
    SVGElement::InvalidationGuard invalidationGuard(this);
    if (isConnected())
      imageLoader().updateFromElement(ImageLoader::UpdateIgnorePreviousError);
    else
      m_needsLoaderURIUpdate = true;
    return;
  }

  SVGGraphicsElement::svgAttributeChanged(attrName);
}

bool SVGImageElement::selfHasRelativeLengths() const {
  return m_x->currentValue()->isRelative() ||
         m_y->currentValue()->isRelative() ||
         m_width->currentValue()->isRelative() ||
         m_height->currentValue()->isRelative();
}

LayoutObject* SVGImageElement::createLayoutObject(const ComputedStyle&) {
  return new LayoutSVGImage(this);
}

bool SVGImageElement::haveLoadedRequiredResources() {
  return !m_needsLoaderURIUpdate && !imageLoader().hasPendingActivity();
}

void SVGImageElement::attachLayoutTree(const AttachContext& context) {
  SVGGraphicsElement::attachLayoutTree(context);

  if (LayoutSVGImage* imageObj = toLayoutSVGImage(layoutObject())) {
    if (imageObj->imageResource()->hasImage())
      return;

    imageObj->imageResource()->setImageResource(imageLoader().image());
  }
}

Node::InsertionNotificationRequest SVGImageElement::insertedInto(
    ContainerNode* rootParent) {
  SVGGraphicsElement::insertedInto(rootParent);
  if (!rootParent->isConnected())
    return InsertionDone;

  // We can only resolve base URIs properly after tree insertion - hence, URI
  // mutations while detached are deferred until this point.
  if (m_needsLoaderURIUpdate) {
    imageLoader().updateFromElement(ImageLoader::UpdateIgnorePreviousError);
    m_needsLoaderURIUpdate = false;
  } else {
    // A previous loader update may have failed to actually fetch the image if
    // the document was inactive. In that case, force a re-update (but don't
    // clear previous errors).
    if (!imageLoader().image())
      imageLoader().updateFromElement();
  }

  return InsertionDone;
}

const AtomicString SVGImageElement::imageSourceURL() const {
  return AtomicString(hrefString());
}

void SVGImageElement::didMoveToNewDocument(Document& oldDocument) {
  imageLoader().elementDidMoveToNewDocument();
  SVGGraphicsElement::didMoveToNewDocument(oldDocument);
}

}  // namespace blink