svgio/source/svgreader/svgclippathnode.cxx

   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
  28 //////////////////////////////////////////////////////////////////////////////
  29
  30 namespace svgio
  31 {
  32     namespace svgreader
  33     {
  34         SvgClipPathNode::SvgClipPathNode(
  35             SvgDocument& rDocument,
  36             SvgNode* pParent)
  37         :   SvgNode(SVGTokenClipPathNode, rDocument, pParent),
  38             maSvgStyleAttributes(*this),
  39             mpaTransform(0),
  40             maClipPathUnits(userSpaceOnUse)
  41         {
  42         }
  43
  44         SvgClipPathNode::~SvgClipPathNode()
  45         {
  46             if(mpaTransform) delete mpaTransform;
  47         }
  48
  49         const SvgStyleAttributes* SvgClipPathNode::getSvgStyleAttributes() const
  50         {
  51             return &maSvgStyleAttributes;
  52         }
  53
  54         void SvgClipPathNode::parseAttribute(const OUString& rTokenName, SVGToken aSVGToken, const OUString& aContent)
  55         {
  56             // call parent
  57             SvgNode::parseAttribute(rTokenName, aSVGToken, aContent);
  58
  59             // read style attributes
  60             maSvgStyleAttributes.parseStyleAttribute(rTokenName, aSVGToken, aContent);
  61
  62             // parse own
  63             switch(aSVGToken)
  64             {
  65                 case SVGTokenStyle:
  66                 {
  67                     maSvgStyleAttributes.readStyle(aContent);
  68                     break;
  69                 }
  70                 case SVGTokenTransform:
  71                 {
  72                     const basegfx::B2DHomMatrix aMatrix(readTransform(aContent, *this));
  73
  74                     if(!aMatrix.isIdentity())
  75                     {
  76                         setTransform(&aMatrix);
  77                     }
  78                     break;
  79                 }
  80                 case SVGTokenClipPathUnits:
  81                 {
  82                     if(!aContent.isEmpty())
  83                     {
  84                         if(aContent.match(commonStrings::aStrUserSpaceOnUse, 0))
  85                         {
  86                             setClipPathUnits(userSpaceOnUse);
  87                         }
  88                         else if(aContent.match(commonStrings::aStrObjectBoundingBox, 0))
  89                         {
  90                             setClipPathUnits(objectBoundingBox);
  91                         }
  92                     }
  93                     break;
  94                 }
  95                 default:
  96                 {
  97                     break;
  98                 }
  99             }
 100         }
 101
 102         void SvgClipPathNode::decomposeSvgNode(drawinglayer::primitive2d::Primitive2DSequence& rTarget, bool bReferenced) const
 103         {
 104             drawinglayer::primitive2d::Primitive2DSequence aNewTarget;
 105
 106             // decompose children
 107             SvgNode::decomposeSvgNode(aNewTarget, bReferenced);
 108
 109             if(aNewTarget.hasElements())
 110             {
 111                 if(getTransform())
 112                 {
 113                     // create embedding group element with transformation
 114                     const drawinglayer::primitive2d::Primitive2DReference xRef(
 115                         new drawinglayer::primitive2d::TransformPrimitive2D(
 116                             *getTransform(),
 117                             aNewTarget));
 118
 119                     drawinglayer::primitive2d::appendPrimitive2DReferenceToPrimitive2DSequence(rTarget, xRef);
 120                 }
 121                 else
 122                 {
 123                     // append to current target
 124                     drawinglayer::primitive2d::appendPrimitive2DSequenceToPrimitive2DSequence(rTarget, aNewTarget);
 125                 }
 126             }
 127         }
 128
 129         void SvgClipPathNode::apply(drawinglayer::primitive2d::Primitive2DSequence& rContent) const
 130         {
 131             if(rContent.hasElements() && Display_none != getDisplay())
 132             {
 133                 const drawinglayer::geometry::ViewInformation2D aViewInformation2D;
 134                 drawinglayer::primitive2d::Primitive2DSequence aClipTarget;
 135                 basegfx::B2DPolyPolygon aClipPolyPolygon;
 136
 137                 // get clipPath definition as primitives
 138                 decomposeSvgNode(aClipTarget, true);
 139
 140                 if(aClipTarget.hasElements())
 141                 {
 142                     // extract filled plygons as base for a mask PolyPolygon
 143                     drawinglayer::processor2d::ContourExtractor2D aExtractor(aViewInformation2D, true);
 144
 145                     aExtractor.process(aClipTarget);
 146
 147                     const basegfx::B2DPolyPolygonVector& rResult(aExtractor.getExtractedContour());
 148                     const sal_uInt32 nSize(rResult.size());
 149
 150                     if(nSize > 1)
 151                     {
 152                         // merge to single clipPolyPolygon
 153                         aClipPolyPolygon = basegfx::tools::mergeToSinglePolyPolygon(rResult);
 154                     }
 155                     else
 156                     {
 157                         aClipPolyPolygon = rResult[0];
 158                     }
 159                 }
 160
 161                 if(aClipPolyPolygon.count())
 162                 {
 163                     if(objectBoundingBox == getClipPathUnits())
 164                     {
 165                         // clip is object-relative, transform using content transformation
 166                         const basegfx::B2DRange aContentRange(
 167                             drawinglayer::primitive2d::getB2DRangeFromPrimitive2DSequence(
 168                                 rContent,
 169                                 aViewInformation2D));
 170
 171                         aClipPolyPolygon.transform(
 172                             basegfx::tools::createScaleTranslateB2DHomMatrix(
 173                                 aContentRange.getRange(),
 174                                 aContentRange.getMinimum()));
 175                     }
 176
 177                     // redefine target. Use MaskPrimitive2D with created clip
 178                     // geometry. Using the automatically set mbIsClipPathContent at
 179                     // SvgStyleAttributes the clip definition is without fill, stroke,
 180                     // and strokeWidth and forced to black
 181                     const drawinglayer::primitive2d::Primitive2DReference xEmbedTransparence(
 182                         new drawinglayer::primitive2d::MaskPrimitive2D(
 183                             aClipPolyPolygon,
 184                             rContent));
 185
 186                     rContent = drawinglayer::primitive2d::Primitive2DSequence(&xEmbedTransparence, 1);
 187                 }
 188                 else
 189                 {
 190                     // An empty clipping path will completely clip away the element that had
 191                     // the ‘clip-path’ property applied. (Svg spec)
 192                     rContent.realloc(0);
 193                 }
 194             }
 195         }
 196
 197     } // end of namespace svgreader
 198 } // end of namespace svgio
 199
 200 //////////////////////////////////////////////////////////////////////////////
 201 // eof
 202
 203 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */