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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #include <svgio/svgreader/svgclippathnode.hxx>
21 : #include <drawinglayer/primitive2d/transformprimitive2d.hxx>
22 : #include <drawinglayer/primitive2d/maskprimitive2d.hxx>
23 : #include <basegfx/matrix/b2dhommatrixtools.hxx>
24 : #include <drawinglayer/geometry/viewinformation2d.hxx>
25 : #include <drawinglayer/processor2d/contourextractor2d.hxx>
26 : #include <basegfx/polygon/b2dpolypolygoncutter.hxx>
27 : #include <basegfx/polygon/b2dpolygontools.hxx>
28 :
29 : namespace svgio
30 : {
31 : namespace svgreader
32 : {
33 93 : SvgClipPathNode::SvgClipPathNode(
34 : SvgDocument& rDocument,
35 : SvgNode* pParent)
36 : : SvgNode(SVGTokenClipPathNode, rDocument, pParent),
37 : maSvgStyleAttributes(*this),
38 : mpaTransform(0),
39 93 : maClipPathUnits(userSpaceOnUse)
40 : {
41 93 : }
42 :
43 279 : SvgClipPathNode::~SvgClipPathNode()
44 : {
45 93 : if(mpaTransform) delete mpaTransform;
46 186 : }
47 :
48 687 : const SvgStyleAttributes* SvgClipPathNode::getSvgStyleAttributes() const
49 : {
50 687 : return &maSvgStyleAttributes;
51 : }
52 :
53 93 : void SvgClipPathNode::parseAttribute(const OUString& rTokenName, SVGToken aSVGToken, const OUString& aContent)
54 : {
55 : // call parent
56 93 : SvgNode::parseAttribute(rTokenName, aSVGToken, aContent);
57 :
58 : // read style attributes
59 93 : maSvgStyleAttributes.parseStyleAttribute(rTokenName, aSVGToken, aContent, false);
60 :
61 : // parse own
62 93 : switch(aSVGToken)
63 : {
64 : case SVGTokenStyle:
65 : {
66 0 : readLocalCssStyle(aContent);
67 0 : break;
68 : }
69 : case SVGTokenTransform:
70 : {
71 0 : const basegfx::B2DHomMatrix aMatrix(readTransform(aContent, *this));
72 :
73 0 : if(!aMatrix.isIdentity())
74 : {
75 0 : setTransform(&aMatrix);
76 : }
77 0 : break;
78 : }
79 : case SVGTokenClipPathUnits:
80 : {
81 0 : if(!aContent.isEmpty())
82 : {
83 0 : if(aContent.match(commonStrings::aStrUserSpaceOnUse, 0))
84 : {
85 0 : setClipPathUnits(userSpaceOnUse);
86 : }
87 0 : else if(aContent.match(commonStrings::aStrObjectBoundingBox, 0))
88 : {
89 0 : setClipPathUnits(objectBoundingBox);
90 : }
91 : }
92 0 : break;
93 : }
94 : default:
95 : {
96 93 : break;
97 : }
98 : }
99 93 : }
100 :
101 249 : void SvgClipPathNode::decomposeSvgNode(drawinglayer::primitive2d::Primitive2DSequence& rTarget, bool bReferenced) const
102 : {
103 249 : drawinglayer::primitive2d::Primitive2DSequence aNewTarget;
104 :
105 : // decompose children
106 249 : SvgNode::decomposeSvgNode(aNewTarget, bReferenced);
107 :
108 249 : if(aNewTarget.hasElements())
109 : {
110 156 : if(getTransform())
111 : {
112 : // create embedding group element with transformation
113 : const drawinglayer::primitive2d::Primitive2DReference xRef(
114 : new drawinglayer::primitive2d::TransformPrimitive2D(
115 : *getTransform(),
116 0 : aNewTarget));
117 :
118 0 : drawinglayer::primitive2d::appendPrimitive2DReferenceToPrimitive2DSequence(rTarget, xRef);
119 : }
120 : else
121 : {
122 : // append to current target
123 156 : drawinglayer::primitive2d::appendPrimitive2DSequenceToPrimitive2DSequence(rTarget, aNewTarget);
124 : }
125 249 : }
126 249 : }
127 :
128 156 : void SvgClipPathNode::apply(
129 : drawinglayer::primitive2d::Primitive2DSequence& rContent,
130 : const basegfx::B2DHomMatrix* pTransform) const
131 : {
132 156 : if(rContent.hasElements() && Display_none != getDisplay())
133 : {
134 156 : const drawinglayer::geometry::ViewInformation2D aViewInformation2D;
135 312 : drawinglayer::primitive2d::Primitive2DSequence aClipTarget;
136 312 : basegfx::B2DPolyPolygon aClipPolyPolygon;
137 :
138 : // get clipPath definition as primitives
139 156 : decomposeSvgNode(aClipTarget, true);
140 :
141 156 : if(aClipTarget.hasElements())
142 : {
143 : // extract filled polygons as base for a mask PolyPolygon
144 156 : drawinglayer::processor2d::ContourExtractor2D aExtractor(aViewInformation2D, true);
145 :
146 156 : aExtractor.process(aClipTarget);
147 :
148 156 : const basegfx::B2DPolyPolygonVector& rResult(aExtractor.getExtractedContour());
149 156 : const sal_uInt32 nSize(rResult.size());
150 :
151 156 : if(nSize > 1)
152 : {
153 : // merge to single clipPolyPolygon
154 0 : aClipPolyPolygon = basegfx::tools::mergeToSinglePolyPolygon(rResult);
155 : }
156 : else
157 : {
158 156 : aClipPolyPolygon = rResult[0];
159 156 : }
160 : }
161 :
162 156 : if(aClipPolyPolygon.count())
163 : {
164 156 : if(objectBoundingBox == getClipPathUnits())
165 : {
166 : // clip is object-relative, transform using content transformation
167 : const basegfx::B2DRange aContentRange(
168 : drawinglayer::primitive2d::getB2DRangeFromPrimitive2DSequence(
169 : rContent,
170 0 : aViewInformation2D));
171 :
172 : aClipPolyPolygon.transform(
173 : basegfx::tools::createScaleTranslateB2DHomMatrix(
174 : aContentRange.getRange(),
175 0 : aContentRange.getMinimum()));
176 : }
177 : else // userSpaceOnUse
178 : {
179 : // #i124852#
180 156 : if(pTransform)
181 : {
182 25 : aClipPolyPolygon.transform(*pTransform);
183 : }
184 : }
185 :
186 : // #i124313# try to avoid creating an embedding to a MaskPrimitive2D if
187 : // possible; MaskPrimitive2D processing is potentially expensive
188 156 : bool bCreateEmbedding(true);
189 156 : bool bAddContent(true);
190 :
191 156 : if(basegfx::tools::isRectangle(aClipPolyPolygon))
192 : {
193 : // ClipRegion is a rectangle, thus it is not expensive to tell
194 : // if the content is completely inside or outside of it; get ranges
195 0 : const basegfx::B2DRange aClipRange(aClipPolyPolygon.getB2DRange());
196 : const basegfx::B2DRange aContentRange(
197 : drawinglayer::primitive2d::getB2DRangeFromPrimitive2DSequence(
198 : rContent,
199 0 : aViewInformation2D));
200 :
201 0 : if(aClipRange.isInside(aContentRange))
202 : {
203 : // completely contained, no need to clip at all, so no need for embedding
204 0 : bCreateEmbedding = false;
205 : }
206 0 : else if(aClipRange.overlaps(aContentRange))
207 : {
208 : // overlap; embedding needed. ClipRegion can be minimized by using
209 : // the intersection of the ClipRange and the ContentRange. Minimizing
210 : // the ClipRegion potentially enhances further processing since
211 : // usually clip operations are expensive.
212 0 : basegfx::B2DRange aCommonRange(aContentRange);
213 :
214 0 : aCommonRange.intersect(aClipRange);
215 0 : aClipPolyPolygon = basegfx::B2DPolyPolygon(basegfx::tools::createPolygonFromRect(aCommonRange));
216 : }
217 : else
218 : {
219 : // not inside and no overlap -> completely outside
220 : // no need for embedding, no need for content at all
221 0 : bCreateEmbedding = false;
222 0 : bAddContent = false;
223 : }
224 : }
225 : else
226 : {
227 : // ClipRegion is not a simple rectangle, it would be possible but expensive to
228 : // tell if the content needs clipping or not. It is also dependent of
229 : // the content's decomposition. To do this, a processor would be needed that
230 : // is capable if processing the given sequence of primitives and decide
231 : // if all is inside or all is outside. Such a ClipProcessor could be written,
232 : // but for now just create the embedding
233 : }
234 :
235 156 : if(bCreateEmbedding)
236 : {
237 : // redefine target. Use MaskPrimitive2D with created clip
238 : // geometry. Using the automatically set mbIsClipPathContent at
239 : // SvgStyleAttributes the clip definition is without fill, stroke,
240 : // and strokeWidth and forced to black
241 : const drawinglayer::primitive2d::Primitive2DReference xEmbedTransparence(
242 : new drawinglayer::primitive2d::MaskPrimitive2D(
243 : aClipPolyPolygon,
244 156 : rContent));
245 :
246 156 : rContent = drawinglayer::primitive2d::Primitive2DSequence(&xEmbedTransparence, 1);
247 : }
248 : else
249 : {
250 0 : if(!bAddContent)
251 : {
252 0 : rContent.realloc(0);
253 : }
254 : }
255 : }
256 : else
257 : {
258 : // An empty clipping path will completely clip away the element that had
259 : // the clip-path property applied. (Svg spec)
260 0 : rContent.realloc(0);
261 156 : }
262 : }
263 156 : }
264 :
265 : } // end of namespace svgreader
266 : } // end of namespace svgio
267 :
268 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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