PassRefPtr<FilterEffect> FilterEffectRenderer::buildReferenceFilter(RenderElement* renderer, PassRefPtr<FilterEffect> previousEffect, ReferenceFilterOperation* filterOperation)
{
if (!renderer)
return nullptr;
Document* document = &renderer->document();
CachedSVGDocumentReference* cachedSVGDocumentReference = filterOperation->cachedSVGDocumentReference();
CachedSVGDocument* cachedSVGDocument = cachedSVGDocumentReference ? cachedSVGDocumentReference->document() : 0;
// If we have an SVG document, this is an external reference. Otherwise
// we look up the referenced node in the current document.
if (cachedSVGDocument)
document = cachedSVGDocument->document();
if (!document)
return nullptr;
Element* filter = document->getElementById(filterOperation->fragment());
if (!filter) {
// Although we did not find the referenced filter, it might exist later in the document.
// FIXME: This skips anonymous RenderObjects. <https://webkit.org/b/131085>
if (Element* element = renderer->element())
document->accessSVGExtensions().addPendingResource(filterOperation->fragment(), element);
return nullptr;
}
RefPtr<FilterEffect> effect;
auto builder = std::make_unique<SVGFilterBuilder>(previousEffect);
for (auto& effectElement : childrenOfType<SVGFilterPrimitiveStandardAttributes>(*filter)) {
effect = effectElement.build(builder.get(), *this);
if (!effect)
continue;
effectElement.setStandardAttributes(effect.get());
builder->add(effectElement.result(), effect);
m_effects.append(effect);
}
return effect;
}
PassRefPtr<FilterEffect> FilterEffectRenderer::buildReferenceFilter(RenderObject* renderer, PassRefPtr<FilterEffect> previousEffect, ReferenceFilterOperation* filterOperation)
{
#if ENABLE(SVG)
if (!renderer)
return 0;
Document* document = renderer->document();
ASSERT(document);
CachedSVGDocumentReference* cachedSVGDocumentReference = filterOperation->cachedSVGDocumentReference();
CachedSVGDocument* cachedSVGDocument = cachedSVGDocumentReference ? cachedSVGDocumentReference->document() : 0;
// If we have an SVG document, this is an external reference. Otherwise
// we look up the referenced node in the current document.
if (cachedSVGDocument)
document = cachedSVGDocument->document();
if (!document)
return 0;
Element* filter = document->getElementById(filterOperation->fragment());
if (!filter) {
// Although we did not find the referenced filter, it might exist later
// in the document
document->accessSVGExtensions()->addPendingResource(filterOperation->fragment(), toElement(renderer->node()));
return 0;
}
RefPtr<FilterEffect> effect;
// FIXME: Figure out what to do with SourceAlpha. Right now, we're
// using the alpha of the original input layer, which is obviously
// wrong. We should probably be extracting the alpha from the
// previousEffect, but this requires some more processing.
// This may need a spec clarification.
RefPtr<SVGFilterBuilder> builder = SVGFilterBuilder::create(previousEffect, SourceAlpha::create(this));
for (Node* node = filter->firstChild(); node; node = node->nextSibling()) {
if (!node->isSVGElement())
continue;
SVGElement* element = toSVGElement(node);
if (!element->isFilterEffect())
continue;
SVGFilterPrimitiveStandardAttributes* effectElement = static_cast<SVGFilterPrimitiveStandardAttributes*>(element);
effect = effectElement->build(builder.get(), this);
if (!effect)
continue;
effectElement->setStandardAttributes(effect.get());
builder->add(effectElement->result(), effect);
m_effects.append(effect);
}
return effect;
#else
UNUSED_PARAM(renderer);
UNUSED_PARAM(previousEffect);
UNUSED_PARAM(filterOperation);
return 0;
#endif
}
