2 * Copyright (C) 2013 Adobe Systems Inc. All rights reserved.
3 * Copyright (C) 2013 Google Inc. All rights reserved.
4 * Copyright (C) 2011 Apple Inc. All rights reserved.
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7 * modification, are permitted provided that the following conditions
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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30 #include "core/rendering/svg/ReferenceFilterBuilder.h"
33 #include "core/css/CSSPrimitiveValue.h"
34 #include "core/css/CSSPrimitiveValueMappings.h"
35 #include "core/css/StylePropertySet.h"
36 #include "core/dom/Element.h"
37 #include "core/fetch/DocumentResource.h"
38 #include "core/rendering/svg/RenderSVGResourceFilter.h"
39 #include "core/svg/SVGDocumentExtensions.h"
40 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
41 #include "core/svg/graphics/filters/SVGFilterBuilder.h"
42 #include "platform/graphics/filters/SourceAlpha.h"
46 HashMap<const FilterOperation*, OwnPtr<DocumentResourceReference> >* ReferenceFilterBuilder::documentResourceReferences = 0;
48 DocumentResourceReference* ReferenceFilterBuilder::documentResourceReference(const FilterOperation* filterOperation)
50 if (!documentResourceReferences)
53 return documentResourceReferences->get(filterOperation);
56 void ReferenceFilterBuilder::setDocumentResourceReference(const FilterOperation* filterOperation, PassOwnPtr<DocumentResourceReference> documentResourceReference)
58 if (!documentResourceReferences)
59 documentResourceReferences = new HashMap<const FilterOperation*, OwnPtr<DocumentResourceReference> >;
60 documentResourceReferences->add(filterOperation, documentResourceReference);
63 void ReferenceFilterBuilder::clearDocumentResourceReference(const FilterOperation* filterOperation)
65 if (!documentResourceReferences)
68 documentResourceReferences->remove(filterOperation);
71 // Returns whether or not the SVGElement object contains a valid color-interpolation-filters attribute
72 static bool getSVGElementColorSpace(SVGElement* svgElement, ColorSpace& cs)
77 const RenderObject* renderer = svgElement->renderer();
78 const RenderStyle* style = renderer ? renderer->style() : 0;
79 const SVGRenderStyle* svgStyle = style ? style->svgStyle() : 0;
80 EColorInterpolation eColorInterpolation = CI_AUTO;
82 // If a layout has been performed, then we can use the fast path to get this attribute
83 eColorInterpolation = svgStyle->colorInterpolationFilters();
84 } else if (!svgElement->presentationAttributeStyle()) {
87 // Otherwise, use the slow path by using string comparison (used by external svg files)
88 RefPtrWillBeRawPtr<CSSValue> cssValue = svgElement->presentationAttributeStyle()->getPropertyCSSValue(CSSPropertyColorInterpolationFilters);
89 if (cssValue.get() && cssValue->isPrimitiveValue()) {
90 const CSSPrimitiveValue& primitiveValue = *((CSSPrimitiveValue*)cssValue.get());
91 eColorInterpolation = (EColorInterpolation)primitiveValue;
97 switch (eColorInterpolation) {
100 cs = ColorSpaceDeviceRGB;
103 cs = ColorSpaceLinearRGB;
112 PassRefPtr<FilterEffect> ReferenceFilterBuilder::build(Filter* parentFilter, RenderObject* renderer, FilterEffect* previousEffect, const ReferenceFilterOperation* filterOperation)
117 TreeScope* treeScope = &renderer->node()->treeScope();
119 if (DocumentResourceReference* documentResourceRef = documentResourceReference(filterOperation)) {
120 DocumentResource* cachedSVGDocument = documentResourceRef->document();
122 // If we have an SVG document, this is an external reference. Otherwise
123 // we look up the referenced node in the current document.
124 if (cachedSVGDocument)
125 treeScope = cachedSVGDocument->document();
131 Element* filter = treeScope->getElementById(filterOperation->fragment());
134 // Although we did not find the referenced filter, it might exist later
136 treeScope->document().accessSVGExtensions().addPendingResource(filterOperation->fragment(), toElement(renderer->node()));
140 if (!isSVGFilterElement(*filter))
143 SVGFilterElement& filterElement = toSVGFilterElement(*filter);
145 // FIXME: Figure out what to do with SourceAlpha. Right now, we're
146 // using the alpha of the original input layer, which is obviously
147 // wrong. We should probably be extracting the alpha from the
148 // previousEffect, but this requires some more processing.
149 // This may need a spec clarification.
150 RefPtr<SVGFilterBuilder> builder = SVGFilterBuilder::create(previousEffect, SourceAlpha::create(parentFilter));
152 ColorSpace filterColorSpace = ColorSpaceDeviceRGB;
153 bool useFilterColorSpace = getSVGElementColorSpace(&filterElement, filterColorSpace);
155 for (SVGElement* element = Traversal<SVGElement>::firstChild(filterElement); element; element = Traversal<SVGElement>::nextSibling(*element)) {
156 if (!element->isFilterEffect())
159 SVGFilterPrimitiveStandardAttributes* effectElement = static_cast<SVGFilterPrimitiveStandardAttributes*>(element);
161 RefPtr<FilterEffect> effect = effectElement->build(builder.get(), parentFilter);
165 effectElement->setStandardAttributes(effect.get());
166 effect->setEffectBoundaries(SVGLengthContext::resolveRectangle<SVGFilterPrimitiveStandardAttributes>(effectElement, filterElement.primitiveUnits()->currentValue()->enumValue(), parentFilter->sourceImageRect()));
167 ColorSpace colorSpace = filterColorSpace;
168 if (useFilterColorSpace || getSVGElementColorSpace(effectElement, colorSpace))
169 effect->setOperatingColorSpace(colorSpace);
170 builder->add(AtomicString(effectElement->result()->currentValue()->value()), effect);
172 return builder->lastEffect();
175 } // namespace WebCore