1 /* 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. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "config.h" 29 30 #include "core/rendering/svg/ReferenceFilterBuilder.h" 31 32 #include "core/css/CSSPrimitiveValue.h" 33 #include "core/css/CSSPrimitiveValueMappings.h" 34 #include "core/css/StylePropertySet.h" 35 #include "core/dom/Element.h" 36 #include "core/dom/ElementTraversal.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" 43 44 namespace blink { 45 46 HashMap<const FilterOperation*, OwnPtr<DocumentResourceReference> >* ReferenceFilterBuilder::documentResourceReferences = 0; 47 48 DocumentResourceReference* ReferenceFilterBuilder::documentResourceReference(const FilterOperation* filterOperation) 49 { 50 if (!documentResourceReferences) 51 return 0; 52 53 return documentResourceReferences->get(filterOperation); 54 } 55 56 void ReferenceFilterBuilder::setDocumentResourceReference(const FilterOperation* filterOperation, PassOwnPtr<DocumentResourceReference> documentResourceReference) 57 { 58 if (!documentResourceReferences) 59 documentResourceReferences = new HashMap<const FilterOperation*, OwnPtr<DocumentResourceReference> >; 60 documentResourceReferences->add(filterOperation, documentResourceReference); 61 } 62 63 void ReferenceFilterBuilder::clearDocumentResourceReference(const FilterOperation* filterOperation) 64 { 65 if (!documentResourceReferences) 66 return; 67 68 documentResourceReferences->remove(filterOperation); 69 } 70 71 // Returns whether or not the SVGElement object contains a valid color-interpolation-filters attribute 72 static bool getSVGElementColorSpace(SVGElement* svgElement, ColorSpace& cs) 73 { 74 if (!svgElement) 75 return false; 76 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; 81 if (svgStyle) { 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()) { 85 return false; 86 } else { 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; 92 } else { 93 return false; 94 } 95 } 96 97 switch (eColorInterpolation) { 98 case CI_AUTO: 99 case CI_SRGB: 100 cs = ColorSpaceDeviceRGB; 101 break; 102 case CI_LINEARRGB: 103 cs = ColorSpaceLinearRGB; 104 break; 105 default: 106 return false; 107 } 108 109 return true; 110 } 111 112 PassRefPtr<FilterEffect> ReferenceFilterBuilder::build(Filter* parentFilter, RenderObject* renderer, FilterEffect* previousEffect, const ReferenceFilterOperation* filterOperation) 113 { 114 if (!renderer) 115 return nullptr; 116 117 TreeScope* treeScope = &renderer->node()->treeScope(); 118 119 if (DocumentResourceReference* documentResourceRef = documentResourceReference(filterOperation)) { 120 DocumentResource* cachedSVGDocument = documentResourceRef->document(); 121 122 // 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(); 126 } 127 128 if (!treeScope) 129 return nullptr; 130 131 Element* filter = treeScope->getElementById(filterOperation->fragment()); 132 133 if (!filter) { 134 // Although we did not find the referenced filter, it might exist later 135 // in the document. 136 treeScope->document().accessSVGExtensions().addPendingResource(filterOperation->fragment(), toElement(renderer->node())); 137 return nullptr; 138 } 139 140 if (!isSVGFilterElement(*filter)) 141 return nullptr; 142 143 SVGFilterElement& filterElement = toSVGFilterElement(*filter); 144 145 // 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)); 151 152 ColorSpace filterColorSpace = ColorSpaceDeviceRGB; 153 bool useFilterColorSpace = getSVGElementColorSpace(&filterElement, filterColorSpace); 154 155 for (SVGElement* element = Traversal<SVGElement>::firstChild(filterElement); element; element = Traversal<SVGElement>::nextSibling(*element)) { 156 if (!element->isFilterEffect()) 157 continue; 158 159 SVGFilterPrimitiveStandardAttributes* effectElement = static_cast<SVGFilterPrimitiveStandardAttributes*>(element); 160 161 RefPtr<FilterEffect> effect = effectElement->build(builder.get(), parentFilter); 162 if (!effect) 163 continue; 164 165 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); 171 } 172 return builder->lastEffect(); 173 } 174 175 } // namespace blink 176