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      1 /*
      2  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2010 Dirk Schulze <krit (at) webkit.org>
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 
     24 #include "core/svg/SVGFEImageElement.h"
     25 
     26 #include "core/XLinkNames.h"
     27 #include "core/dom/Document.h"
     28 #include "core/fetch/FetchRequest.h"
     29 #include "core/fetch/ResourceFetcher.h"
     30 #include "core/rendering/svg/RenderSVGResource.h"
     31 #include "core/svg/SVGPreserveAspectRatio.h"
     32 #include "platform/graphics/Image.h"
     33 
     34 namespace WebCore {
     35 
     36 inline SVGFEImageElement::SVGFEImageElement(Document& document)
     37     : SVGFilterPrimitiveStandardAttributes(SVGNames::feImageTag, document)
     38     , SVGURIReference(this)
     39     , m_preserveAspectRatio(SVGAnimatedPreserveAspectRatio::create(this, SVGNames::preserveAspectRatioAttr, SVGPreserveAspectRatio::create()))
     40 {
     41     ScriptWrappable::init(this);
     42     addToPropertyMap(m_preserveAspectRatio);
     43 }
     44 
     45 DEFINE_NODE_FACTORY(SVGFEImageElement)
     46 
     47 SVGFEImageElement::~SVGFEImageElement()
     48 {
     49 #if ENABLE(OILPAN)
     50     if (m_cachedImage) {
     51         m_cachedImage->removeClient(this);
     52         m_cachedImage = 0;
     53     }
     54 #else
     55     clearResourceReferences();
     56 #endif
     57 }
     58 
     59 bool SVGFEImageElement::currentFrameHasSingleSecurityOrigin() const
     60 {
     61     if (m_cachedImage && m_cachedImage->image())
     62         return m_cachedImage->image()->currentFrameHasSingleSecurityOrigin();
     63 
     64     return true;
     65 }
     66 
     67 void SVGFEImageElement::clearResourceReferences()
     68 {
     69     if (m_cachedImage) {
     70         m_cachedImage->removeClient(this);
     71         m_cachedImage = 0;
     72     }
     73 
     74     document().accessSVGExtensions().removeAllTargetReferencesForElement(this);
     75 }
     76 
     77 void SVGFEImageElement::fetchImageResource()
     78 {
     79     FetchRequest request(ResourceRequest(ownerDocument()->completeURL(hrefString())), localName());
     80     m_cachedImage = document().fetcher()->fetchImage(request);
     81 
     82     if (m_cachedImage)
     83         m_cachedImage->addClient(this);
     84 }
     85 
     86 void SVGFEImageElement::buildPendingResource()
     87 {
     88     clearResourceReferences();
     89     if (!inDocument())
     90         return;
     91 
     92     AtomicString id;
     93     Element* target = SVGURIReference::targetElementFromIRIString(hrefString(), treeScope(), &id);
     94     if (!target) {
     95         if (id.isEmpty())
     96             fetchImageResource();
     97         else {
     98             document().accessSVGExtensions().addPendingResource(id, this);
     99             ASSERT(hasPendingResources());
    100         }
    101     } else if (target->isSVGElement()) {
    102         // Register us with the target in the dependencies map. Any change of hrefElement
    103         // that leads to relayout/repainting now informs us, so we can react to it.
    104         document().accessSVGExtensions().addElementReferencingTarget(this, toSVGElement(target));
    105     }
    106 
    107     invalidate();
    108 }
    109 
    110 bool SVGFEImageElement::isSupportedAttribute(const QualifiedName& attrName)
    111 {
    112     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
    113     if (supportedAttributes.isEmpty()) {
    114         SVGURIReference::addSupportedAttributes(supportedAttributes);
    115         supportedAttributes.add(SVGNames::preserveAspectRatioAttr);
    116     }
    117     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
    118 }
    119 
    120 void SVGFEImageElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
    121 {
    122     if (!isSupportedAttribute(name)) {
    123         SVGFilterPrimitiveStandardAttributes::parseAttribute(name, value);
    124         return;
    125     }
    126 
    127     SVGParsingError parseError = NoError;
    128 
    129     if (name == SVGNames::preserveAspectRatioAttr) {
    130         m_preserveAspectRatio->setBaseValueAsString(value, parseError);
    131     } else if (SVGURIReference::parseAttribute(name, value, parseError)) {
    132     } else {
    133         ASSERT_NOT_REACHED();
    134     }
    135 
    136     reportAttributeParsingError(parseError, name, value);
    137 }
    138 
    139 void SVGFEImageElement::svgAttributeChanged(const QualifiedName& attrName)
    140 {
    141     if (!isSupportedAttribute(attrName)) {
    142         SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
    143         return;
    144     }
    145 
    146     SVGElement::InvalidationGuard invalidationGuard(this);
    147 
    148     if (attrName == SVGNames::preserveAspectRatioAttr) {
    149         invalidate();
    150         return;
    151     }
    152 
    153     if (SVGURIReference::isKnownAttribute(attrName)) {
    154         buildPendingResource();
    155         return;
    156     }
    157 
    158     ASSERT_NOT_REACHED();
    159 }
    160 
    161 Node::InsertionNotificationRequest SVGFEImageElement::insertedInto(ContainerNode* rootParent)
    162 {
    163     SVGFilterPrimitiveStandardAttributes::insertedInto(rootParent);
    164     buildPendingResource();
    165     return InsertionDone;
    166 }
    167 
    168 void SVGFEImageElement::removedFrom(ContainerNode* rootParent)
    169 {
    170     SVGFilterPrimitiveStandardAttributes::removedFrom(rootParent);
    171     if (rootParent->inDocument())
    172         clearResourceReferences();
    173 }
    174 
    175 void SVGFEImageElement::notifyFinished(Resource*)
    176 {
    177     if (!inDocument())
    178         return;
    179 
    180     Element* parent = parentElement();
    181     ASSERT(parent);
    182 
    183     if (!isSVGFilterElement(*parent) || !parent->renderer())
    184         return;
    185 
    186     if (RenderObject* renderer = this->renderer())
    187         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
    188 }
    189 
    190 PassRefPtr<FilterEffect> SVGFEImageElement::build(SVGFilterBuilder*, Filter* filter)
    191 {
    192     if (m_cachedImage)
    193         return FEImage::createWithImage(filter, m_cachedImage->imageForRenderer(renderer()), m_preserveAspectRatio->currentValue());
    194     return FEImage::createWithIRIReference(filter, treeScope(), hrefString(), m_preserveAspectRatio->currentValue());
    195 }
    196 
    197 }
    198