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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 #if ENABLE(SVG) && ENABLE(FILTERS)
     25 #include "SVGFEImageElement.h"
     26 
     27 #include "Attr.h"
     28 #include "CachedImage.h"
     29 #include "CachedResourceLoader.h"
     30 #include "ColorSpace.h"
     31 #include "Document.h"
     32 #include "Image.h"
     33 #include "RenderObject.h"
     34 #include "RenderSVGResource.h"
     35 #include "SVGImageBufferTools.h"
     36 #include "SVGNames.h"
     37 #include "SVGPreserveAspectRatio.h"
     38 
     39 namespace WebCore {
     40 
     41 // Animated property definitions
     42 DEFINE_ANIMATED_PRESERVEASPECTRATIO(SVGFEImageElement, SVGNames::preserveAspectRatioAttr, PreserveAspectRatio, preserveAspectRatio)
     43 DEFINE_ANIMATED_STRING(SVGFEImageElement, XLinkNames::hrefAttr, Href, href)
     44 DEFINE_ANIMATED_BOOLEAN(SVGFEImageElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
     45 
     46 inline SVGFEImageElement::SVGFEImageElement(const QualifiedName& tagName, Document* document)
     47     : SVGFilterPrimitiveStandardAttributes(tagName, document)
     48 {
     49 }
     50 
     51 PassRefPtr<SVGFEImageElement> SVGFEImageElement::create(const QualifiedName& tagName, Document* document)
     52 {
     53     return adoptRef(new SVGFEImageElement(tagName, document));
     54 }
     55 
     56 SVGFEImageElement::~SVGFEImageElement()
     57 {
     58     if (m_cachedImage)
     59         m_cachedImage->removeClient(this);
     60 }
     61 
     62 void SVGFEImageElement::requestImageResource()
     63 {
     64     if (m_cachedImage) {
     65         m_cachedImage->removeClient(this);
     66         m_cachedImage = 0;
     67     }
     68 
     69     Element* hrefElement = document()->getElementById(SVGURIReference::getTarget(href()));
     70     if (hrefElement && hrefElement->isSVGElement() && hrefElement->renderer())
     71         return;
     72 
     73     m_cachedImage = ownerDocument()->cachedResourceLoader()->requestImage(href());
     74 
     75     if (m_cachedImage)
     76         m_cachedImage->addClient(this);
     77 }
     78 
     79 void SVGFEImageElement::parseMappedAttribute(Attribute* attr)
     80 {
     81     const String& value = attr->value();
     82     if (attr->name() == SVGNames::preserveAspectRatioAttr)
     83         SVGPreserveAspectRatio::parsePreserveAspectRatio(this, value);
     84     else {
     85         if (SVGURIReference::parseMappedAttribute(attr)) {
     86             requestImageResource();
     87             return;
     88         }
     89         if (SVGLangSpace::parseMappedAttribute(attr))
     90             return;
     91         if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
     92             return;
     93 
     94         SVGFilterPrimitiveStandardAttributes::parseMappedAttribute(attr);
     95     }
     96 }
     97 
     98 void SVGFEImageElement::svgAttributeChanged(const QualifiedName& attrName)
     99 {
    100     SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
    101 
    102     if (attrName == SVGNames::preserveAspectRatioAttr)
    103         invalidate();
    104 }
    105 
    106 void SVGFEImageElement::synchronizeProperty(const QualifiedName& attrName)
    107 {
    108     SVGFilterPrimitiveStandardAttributes::synchronizeProperty(attrName);
    109 
    110     if (attrName == anyQName()) {
    111         synchronizePreserveAspectRatio();
    112         synchronizeHref();
    113         synchronizeExternalResourcesRequired();
    114         return;
    115     }
    116 
    117     if (attrName == SVGNames::preserveAspectRatioAttr)
    118         synchronizePreserveAspectRatio();
    119     else if (SVGURIReference::isKnownAttribute(attrName))
    120         synchronizeHref();
    121     else if (SVGExternalResourcesRequired::isKnownAttribute(attrName))
    122         synchronizeExternalResourcesRequired();
    123 }
    124 
    125 AttributeToPropertyTypeMap& SVGFEImageElement::attributeToPropertyTypeMap()
    126 {
    127     DEFINE_STATIC_LOCAL(AttributeToPropertyTypeMap, s_attributeToPropertyTypeMap, ());
    128     return s_attributeToPropertyTypeMap;
    129 }
    130 
    131 void SVGFEImageElement::fillAttributeToPropertyTypeMap()
    132 {
    133     AttributeToPropertyTypeMap& attributeToPropertyTypeMap = this->attributeToPropertyTypeMap();
    134 
    135     SVGFilterPrimitiveStandardAttributes::fillPassedAttributeToPropertyTypeMap(attributeToPropertyTypeMap);
    136     attributeToPropertyTypeMap.set(SVGNames::preserveAspectRatioAttr, AnimatedPreserveAspectRatio);
    137     attributeToPropertyTypeMap.set(XLinkNames::hrefAttr, AnimatedString);
    138 }
    139 
    140 void SVGFEImageElement::notifyFinished(CachedResource*)
    141 {
    142     if (!inDocument())
    143         return;
    144 
    145     Element* parent = parentElement();
    146     ASSERT(parent);
    147 
    148     if (!parent->hasTagName(SVGNames::filterTag) || !parent->renderer())
    149         return;
    150 
    151     RenderSVGResource::markForLayoutAndParentResourceInvalidation(parent->renderer());
    152 }
    153 
    154 PassRefPtr<FilterEffect> SVGFEImageElement::build(SVGFilterBuilder*, Filter* filter)
    155 {
    156     if (!m_cachedImage && !m_targetImage) {
    157         Element* hrefElement = document()->getElementById(SVGURIReference::getTarget(href()));
    158         if (!hrefElement || !hrefElement->isSVGElement())
    159             return 0;
    160 
    161         RenderObject* renderer = hrefElement->renderer();
    162         if (!renderer)
    163             return 0;
    164 
    165         IntRect targetRect = enclosingIntRect(renderer->objectBoundingBox());
    166         m_targetImage = ImageBuffer::create(targetRect.size(), ColorSpaceLinearRGB);
    167 
    168         AffineTransform contentTransformation;
    169         SVGImageBufferTools::renderSubtreeToImageBuffer(m_targetImage.get(), renderer, contentTransformation);
    170     }
    171 
    172     return FEImage::create(filter, m_targetImage ? m_targetImage->copyImage() : m_cachedImage->image(), preserveAspectRatio());
    173 }
    174 
    175 void SVGFEImageElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
    176 {
    177     SVGFilterPrimitiveStandardAttributes::addSubresourceAttributeURLs(urls);
    178 
    179     addSubresourceURL(urls, document()->completeURL(href()));
    180 }
    181 
    182 }
    183 
    184 #endif // ENABLE(SVG)
    185