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/fetch/DocumentResource.h"
37 #include "core/rendering/svg/RenderSVGResourceFilter.h"
38 #include "core/svg/SVGDocumentExtensions.h"
39 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
40 #include "core/svg/graphics/filters/SVGFilterBuilder.h"
41 #include "platform/graphics/filters/SourceAlpha.h"
42
43 namespace WebCore {
44
45 HashMap<const FilterOperation*, OwnPtr<DocumentResourceReference> >* ReferenceFilterBuilder::documentResourceReferences = 0;
46
documentResourceReference(const FilterOperation * filterOperation)47 DocumentResourceReference* ReferenceFilterBuilder::documentResourceReference(const FilterOperation* filterOperation)
48 {
49 if (!documentResourceReferences)
50 return 0;
51
52 return documentResourceReferences->get(filterOperation);
53 }
54
setDocumentResourceReference(const FilterOperation * filterOperation,PassOwnPtr<DocumentResourceReference> documentResourceReference)55 void ReferenceFilterBuilder::setDocumentResourceReference(const FilterOperation* filterOperation, PassOwnPtr<DocumentResourceReference> documentResourceReference)
56 {
57 if (!documentResourceReferences)
58 documentResourceReferences = new HashMap<const FilterOperation*, OwnPtr<DocumentResourceReference> >;
59 documentResourceReferences->add(filterOperation, documentResourceReference);
60 }
61
clearDocumentResourceReference(const FilterOperation * filterOperation)62 void ReferenceFilterBuilder::clearDocumentResourceReference(const FilterOperation* filterOperation)
63 {
64 if (!documentResourceReferences)
65 return;
66
67 documentResourceReferences->remove(filterOperation);
68 }
69
70 // Returns whether or not the SVGElement object contains a valid color-interpolation-filters attribute
getSVGElementColorSpace(SVGElement * svgElement,ColorSpace & cs)71 static bool getSVGElementColorSpace(SVGElement* svgElement, ColorSpace& cs)
72 {
73 if (!svgElement)
74 return false;
75
76 const RenderObject* renderer = svgElement->renderer();
77 const RenderStyle* style = renderer ? renderer->style() : 0;
78 const SVGRenderStyle* svgStyle = style ? style->svgStyle() : 0;
79 EColorInterpolation eColorInterpolation = CI_AUTO;
80 if (svgStyle) {
81 // If a layout has been performed, then we can use the fast path to get this attribute
82 eColorInterpolation = svgStyle->colorInterpolationFilters();
83 } else if (!svgElement->presentationAttributeStyle()) {
84 return false;
85 } else {
86 // Otherwise, use the slow path by using string comparison (used by external svg files)
87 RefPtrWillBeRawPtr<CSSValue> cssValue = svgElement->presentationAttributeStyle()->getPropertyCSSValue(CSSPropertyColorInterpolationFilters);
88 if (cssValue.get() && cssValue->isPrimitiveValue()) {
89 const CSSPrimitiveValue& primitiveValue = *((CSSPrimitiveValue*)cssValue.get());
90 eColorInterpolation = (EColorInterpolation)primitiveValue;
91 } else {
92 return false;
93 }
94 }
95
96 switch (eColorInterpolation) {
97 case CI_AUTO:
98 case CI_SRGB:
99 cs = ColorSpaceDeviceRGB;
100 break;
101 case CI_LINEARRGB:
102 cs = ColorSpaceLinearRGB;
103 break;
104 default:
105 return false;
106 }
107
108 return true;
109 }
110
build(Filter * parentFilter,RenderObject * renderer,FilterEffect * previousEffect,const ReferenceFilterOperation * filterOperation)111 PassRefPtr<FilterEffect> ReferenceFilterBuilder::build(Filter* parentFilter, RenderObject* renderer, FilterEffect* previousEffect, const ReferenceFilterOperation* filterOperation)
112 {
113 if (!renderer)
114 return nullptr;
115
116 TreeScope* treeScope = &renderer->node()->treeScope();
117
118 if (DocumentResourceReference* documentResourceRef = documentResourceReference(filterOperation)) {
119 DocumentResource* cachedSVGDocument = documentResourceRef->document();
120
121 // If we have an SVG document, this is an external reference. Otherwise
122 // we look up the referenced node in the current document.
123 if (cachedSVGDocument)
124 treeScope = cachedSVGDocument->document();
125 }
126
127 if (!treeScope)
128 return nullptr;
129
130 Element* filter = treeScope->getElementById(filterOperation->fragment());
131
132 if (!filter) {
133 // Although we did not find the referenced filter, it might exist later
134 // in the document.
135 treeScope->document().accessSVGExtensions().addPendingResource(filterOperation->fragment(), toElement(renderer->node()));
136 return nullptr;
137 }
138
139 if (!isSVGFilterElement(*filter))
140 return nullptr;
141
142 SVGFilterElement& filterElement = toSVGFilterElement(*filter);
143
144 // FIXME: Figure out what to do with SourceAlpha. Right now, we're
145 // using the alpha of the original input layer, which is obviously
146 // wrong. We should probably be extracting the alpha from the
147 // previousEffect, but this requires some more processing.
148 // This may need a spec clarification.
149 RefPtr<SVGFilterBuilder> builder = SVGFilterBuilder::create(previousEffect, SourceAlpha::create(parentFilter));
150
151 ColorSpace filterColorSpace = ColorSpaceDeviceRGB;
152 bool useFilterColorSpace = getSVGElementColorSpace(&filterElement, filterColorSpace);
153
154 for (SVGElement* element = Traversal<SVGElement>::firstChild(filterElement); element; element = Traversal<SVGElement>::nextSibling(*element)) {
155 if (!element->isFilterEffect())
156 continue;
157
158 SVGFilterPrimitiveStandardAttributes* effectElement = static_cast<SVGFilterPrimitiveStandardAttributes*>(element);
159
160 RefPtr<FilterEffect> effect = effectElement->build(builder.get(), parentFilter);
161 if (!effect)
162 continue;
163
164 effectElement->setStandardAttributes(effect.get());
165 effect->setEffectBoundaries(SVGLengthContext::resolveRectangle<SVGFilterPrimitiveStandardAttributes>(effectElement, filterElement.primitiveUnits()->currentValue()->enumValue(), parentFilter->sourceImageRect()));
166 ColorSpace colorSpace = filterColorSpace;
167 if (useFilterColorSpace || getSVGElementColorSpace(effectElement, colorSpace))
168 effect->setOperatingColorSpace(colorSpace);
169 builder->add(AtomicString(effectElement->result()->currentValue()->value()), effect);
170 }
171 return builder->lastEffect();
172 }
173
174 } // namespace WebCore
175