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
documentResourceReference(const FilterOperation * filterOperation)48 DocumentResourceReference* ReferenceFilterBuilder::documentResourceReference(const FilterOperation* filterOperation)
49 {
50 if (!documentResourceReferences)
51 return 0;
52
53 return documentResourceReferences->get(filterOperation);
54 }
55
setDocumentResourceReference(const FilterOperation * filterOperation,PassOwnPtr<DocumentResourceReference> documentResourceReference)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
clearDocumentResourceReference(const FilterOperation * filterOperation)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
getSVGElementColorSpace(SVGElement * svgElement,ColorSpace & cs)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
build(Filter * parentFilter,RenderObject * renderer,FilterEffect * previousEffect,const ReferenceFilterOperation * filterOperation)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