1 /*
2 Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 2004, 2005 Rob Buis <buis@kde.org>
4 2005 Eric Seidel <eric@webkit.org>
5 2009 Dirk Schulze <krit@webkit.org>
6
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
11
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
16
17 You should have received a copy of the GNU Library General Public License
18 aint with this library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA.
21 */
22
23 #include "config.h"
24
25 #if ENABLE(SVG) && ENABLE(FILTERS)
26 #include "SVGResourceFilter.h"
27
28 #include "FilterEffect.h"
29 #include "GraphicsContext.h"
30 #include "ImageBuffer.h"
31 #include "PlatformString.h"
32 #include "SVGFilter.h"
33 #include "SVGFilterBuilder.h"
34 #include "SVGFilterElement.h"
35 #include "SVGRenderSupport.h"
36 #include "SVGRenderTreeAsText.h"
37 #include "SVGFilterPrimitiveStandardAttributes.h"
38
39 static const float kMaxFilterSize = 5000.0f;
40
41 using std::min;
42
43 namespace WebCore {
44
SVGResourceFilter(const SVGFilterElement * ownerElement)45 SVGResourceFilter::SVGResourceFilter(const SVGFilterElement* ownerElement)
46 : SVGResource()
47 , m_ownerElement(ownerElement)
48 , m_filterBBoxMode(false)
49 , m_effectBBoxMode(false)
50 , m_filterRes(false)
51 , m_scaleX(1.f)
52 , m_scaleY(1.f)
53 , m_savedContext(0)
54 , m_sourceGraphicBuffer(0)
55 {
56 m_filterBuilder.set(new SVGFilterBuilder());
57 }
58
~SVGResourceFilter()59 SVGResourceFilter::~SVGResourceFilter()
60 {
61 }
62
filterBoundingBox(const FloatRect & obb) const63 FloatRect SVGResourceFilter::filterBoundingBox(const FloatRect& obb) const
64 {
65 return m_ownerElement->filterBoundingBox(obb);
66 }
67
shouldProcessFilter(SVGResourceFilter * filter,const FloatRect & filterRect)68 static inline bool shouldProcessFilter(SVGResourceFilter* filter, const FloatRect& filterRect)
69 {
70 return (!filter->scaleX() || !filter->scaleY() || !filterRect.width() || !filterRect.height());
71 }
72
addFilterEffect(SVGFilterPrimitiveStandardAttributes * effectAttributes,PassRefPtr<FilterEffect> effect)73 void SVGResourceFilter::addFilterEffect(SVGFilterPrimitiveStandardAttributes* effectAttributes, PassRefPtr<FilterEffect> effect)
74 {
75 effectAttributes->setStandardAttributes(this, effect.get());
76 builder()->add(effectAttributes->result(), effect);
77 }
78
fitsInMaximumImageSize(const FloatSize & size)79 bool SVGResourceFilter::fitsInMaximumImageSize(const FloatSize& size)
80 {
81 bool matchesFilterSize = true;
82 if (size.width() > kMaxFilterSize) {
83 m_scaleX *= kMaxFilterSize / size.width();
84 matchesFilterSize = false;
85 }
86 if (size.height() > kMaxFilterSize) {
87 m_scaleY *= kMaxFilterSize / size.height();
88 matchesFilterSize = false;
89 }
90
91 return matchesFilterSize;
92 }
93
prepareFilter(GraphicsContext * & context,const RenderObject * object)94 bool SVGResourceFilter::prepareFilter(GraphicsContext*& context, const RenderObject* object)
95 {
96 m_ownerElement->buildFilter(object->objectBoundingBox());
97 const SVGRenderBase* renderer = object->toSVGRenderBase();
98 if (!renderer)
99 return false;
100
101 FloatRect paintRect = renderer->strokeBoundingBox();
102 paintRect.unite(renderer->markerBoundingBox());
103
104 if (shouldProcessFilter(this, m_filterBBox))
105 return false;
106
107 // clip sourceImage to filterRegion
108 FloatRect clippedSourceRect = paintRect;
109 clippedSourceRect.intersect(m_filterBBox);
110
111 // scale filter size to filterRes
112 FloatRect tempSourceRect = clippedSourceRect;
113 if (m_filterRes) {
114 m_scaleX = m_filterResSize.width() / m_filterBBox.width();
115 m_scaleY = m_filterResSize.height() / m_filterBBox.height();
116 }
117
118 // scale to big sourceImage size to kMaxFilterSize
119 tempSourceRect.scale(m_scaleX, m_scaleY);
120 fitsInMaximumImageSize(tempSourceRect.size());
121
122 // prepare Filters
123 m_filter = SVGFilter::create(paintRect, m_filterBBox, m_effectBBoxMode);
124 m_filter->setFilterResolution(FloatSize(m_scaleX, m_scaleY));
125
126 FilterEffect* lastEffect = m_filterBuilder->lastEffect();
127 if (lastEffect) {
128 lastEffect->calculateEffectRect(m_filter.get());
129 // at least one FilterEffect has a too big image size,
130 // recalculate the effect sizes with new scale factors
131 if (!fitsInMaximumImageSize(m_filter->maxImageSize())) {
132 m_filter->setFilterResolution(FloatSize(m_scaleX, m_scaleY));
133 lastEffect->calculateEffectRect(m_filter.get());
134 }
135 } else
136 return false;
137
138 clippedSourceRect.scale(m_scaleX, m_scaleY);
139
140 // Draw the content of the current element and it's childs to a imageBuffer to get the SourceGraphic.
141 // The size of the SourceGraphic is clipped to the size of the filterRegion.
142 IntRect bufferRect = enclosingIntRect(clippedSourceRect);
143 OwnPtr<ImageBuffer> sourceGraphic(ImageBuffer::create(bufferRect.size(), LinearRGB));
144
145 if (!sourceGraphic.get())
146 return false;
147
148 GraphicsContext* sourceGraphicContext = sourceGraphic->context();
149 sourceGraphicContext->translate(-clippedSourceRect.x(), -clippedSourceRect.y());
150 sourceGraphicContext->scale(FloatSize(m_scaleX, m_scaleY));
151 sourceGraphicContext->clearRect(FloatRect(FloatPoint(), paintRect.size()));
152 m_sourceGraphicBuffer.set(sourceGraphic.release());
153 m_savedContext = context;
154
155 context = sourceGraphicContext;
156 return true;
157 }
158
applyFilter(GraphicsContext * & context,const RenderObject * object)159 void SVGResourceFilter::applyFilter(GraphicsContext*& context, const RenderObject* object)
160 {
161 if (!m_savedContext)
162 return;
163
164 context = m_savedContext;
165 m_savedContext = 0;
166 #if !PLATFORM(CG)
167 m_sourceGraphicBuffer->transformColorSpace(DeviceRGB, LinearRGB);
168 #endif
169
170 FilterEffect* lastEffect = m_filterBuilder->lastEffect();
171
172 if (lastEffect && !m_filterBBox.isEmpty() && !lastEffect->subRegion().isEmpty()) {
173 m_filter->setSourceImage(m_sourceGraphicBuffer.release());
174 lastEffect->apply(m_filter.get());
175
176 ImageBuffer* resultImage = lastEffect->resultImage();
177 if (resultImage) {
178 #if !PLATFORM(CG)
179 resultImage->transformColorSpace(LinearRGB, DeviceRGB);
180 #endif
181 ColorSpace colorSpace = DeviceColorSpace;
182 if (object)
183 colorSpace = object->style()->colorSpace();
184 context->drawImage(resultImage->image(), colorSpace, lastEffect->subRegion());
185 }
186 }
187
188 m_sourceGraphicBuffer.clear();
189 }
190
externalRepresentation(TextStream & ts) const191 TextStream& SVGResourceFilter::externalRepresentation(TextStream& ts) const
192 {
193 ts << "[type=FILTER] ";
194
195 FloatRect bbox = filterRect();
196 static FloatRect defaultFilterRect(0, 0, 1, 1);
197
198 if (!filterBoundingBoxMode() || bbox != defaultFilterRect) {
199 ts << " [bounding box=";
200 if (filterBoundingBoxMode()) {
201 bbox.scale(100.f);
202 ts << "at (" << bbox.x() << "%," << bbox.y() << "%) size " << bbox.width() << "%x" << bbox.height() << "%";
203 } else
204 ts << filterRect();
205 ts << "]";
206 }
207
208 if (!filterBoundingBoxMode()) // default is true
209 ts << " [bounding box mode=" << filterBoundingBoxMode() << "]";
210 if (effectBoundingBoxMode()) // default is false
211 ts << " [effect bounding box mode=" << effectBoundingBoxMode() << "]";
212
213 return ts;
214 }
215
getFilterById(Document * document,const AtomicString & id,const RenderObject * object)216 SVGResourceFilter* getFilterById(Document* document, const AtomicString& id, const RenderObject* object)
217 {
218 SVGResource* resource = getResourceById(document, id, object);
219 if (resource && resource->isFilter())
220 return static_cast<SVGResourceFilter*>(resource);
221
222 return 0;
223 }
224
225
226 } // namespace WebCore
227
228 #endif // ENABLE(SVG)
229