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diff --git a/svgio/source/svgreader/svgclippathnode.cxx b/svgio/source/svgreader/svgclippathnode.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <svgclippathnode.hxx>
+#include <drawinglayer/primitive2d/transformprimitive2d.hxx>
+#include <drawinglayer/primitive2d/maskprimitive2d.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+#include <drawinglayer/geometry/viewinformation2d.hxx>
+#include <drawinglayer/processor2d/contourextractor2d.hxx>
+#include <basegfx/polygon/b2dpolypolygoncutter.hxx>
+#include <basegfx/polygon/b2dpolygontools.hxx>
+
+namespace svgio::svgreader
+{
+ SvgClipPathNode::SvgClipPathNode(
+ SvgDocument& rDocument,
+ SvgNode* pParent)
+ : SvgNode(SVGToken::ClipPathNode, rDocument, pParent),
+ maSvgStyleAttributes(*this),
+ maClipPathUnits(SvgUnits::userSpaceOnUse)
+ {
+ }
+
+ SvgClipPathNode::~SvgClipPathNode()
+ {
+ }
+
+ const SvgStyleAttributes* SvgClipPathNode::getSvgStyleAttributes() const
+ {
+ return &maSvgStyleAttributes;
+ }
+
+ void SvgClipPathNode::parseAttribute(const OUString& rTokenName, SVGToken aSVGToken, const OUString& aContent)
+ {
+ // call parent
+ SvgNode::parseAttribute(rTokenName, aSVGToken, aContent);
+
+ // read style attributes
+ maSvgStyleAttributes.parseStyleAttribute(aSVGToken, aContent, false);
+
+ // parse own
+ switch(aSVGToken)
+ {
+ case SVGToken::Style:
+ {
+ readLocalCssStyle(aContent);
+ break;
+ }
+ case SVGToken::Transform:
+ {
+ const basegfx::B2DHomMatrix aMatrix(readTransform(aContent, *this));
+
+ if(!aMatrix.isIdentity())
+ {
+ setTransform(aMatrix);
+ }
+ break;
+ }
+ case SVGToken::ClipPathUnits:
+ {
+ if(!aContent.isEmpty())
+ {
+ if(aContent.match(commonStrings::aStrUserSpaceOnUse))
+ {
+ setClipPathUnits(SvgUnits::userSpaceOnUse);
+ }
+ else if(aContent.match(commonStrings::aStrObjectBoundingBox))
+ {
+ setClipPathUnits(SvgUnits::objectBoundingBox);
+ }
+ }
+ break;
+ }
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ void SvgClipPathNode::decomposeSvgNode(drawinglayer::primitive2d::Primitive2DContainer& rTarget, bool bReferenced) const
+ {
+ drawinglayer::primitive2d::Primitive2DContainer aNewTarget;
+
+ // decompose children
+ SvgNode::decomposeSvgNode(aNewTarget, bReferenced);
+
+ if(aNewTarget.empty())
+ return;
+
+ if(getTransform())
+ {
+ // create embedding group element with transformation
+ const drawinglayer::primitive2d::Primitive2DReference xRef(
+ new drawinglayer::primitive2d::TransformPrimitive2D(
+ *getTransform(),
+ std::move(aNewTarget)));
+
+ rTarget.push_back(xRef);
+ }
+ else
+ {
+ // append to current target
+ rTarget.append(aNewTarget);
+ }
+ }
+
+ void SvgClipPathNode::apply(
+ drawinglayer::primitive2d::Primitive2DContainer& rContent,
+ const std::optional<basegfx::B2DHomMatrix>& pTransform) const
+ {
+ if (rContent.empty() || Display::None == getDisplay())
+ return;
+
+ const drawinglayer::geometry::ViewInformation2D aViewInformation2D;
+ drawinglayer::primitive2d::Primitive2DContainer aClipTarget;
+ basegfx::B2DPolyPolygon aClipPolyPolygon;
+
+ // get clipPath definition as primitives
+ decomposeSvgNode(aClipTarget, true);
+
+ if(!aClipTarget.empty())
+ {
+ // extract filled polygons as base for a mask PolyPolygon
+ drawinglayer::processor2d::ContourExtractor2D aExtractor(aViewInformation2D, true);
+
+ aExtractor.process(aClipTarget);
+
+ const basegfx::B2DPolyPolygonVector& rResult(aExtractor.getExtractedContour());
+ const sal_uInt32 nSize(rResult.size());
+
+ if(nSize > 1)
+ {
+ // merge to single clipPolyPolygon
+ aClipPolyPolygon = basegfx::utils::mergeToSinglePolyPolygon(rResult);
+ }
+ else
+ {
+ aClipPolyPolygon = rResult[0];
+ }
+ }
+
+ if(aClipPolyPolygon.count())
+ {
+ if (SvgUnits::objectBoundingBox == getClipPathUnits())
+ {
+ // clip is object-relative, transform using content transformation
+ const basegfx::B2DRange aContentRange(rContent.getB2DRange(aViewInformation2D));
+
+ aClipPolyPolygon.transform(
+ basegfx::utils::createScaleTranslateB2DHomMatrix(
+ aContentRange.getRange(),
+ aContentRange.getMinimum()));
+ }
+ else // userSpaceOnUse
+ {
+ // #i124852#
+ if(pTransform)
+ {
+ aClipPolyPolygon.transform(*pTransform);
+ }
+ }
+
+ // #i124313# try to avoid creating an embedding to a MaskPrimitive2D if
+ // possible; MaskPrimitive2D processing is potentially expensive
+ bool bCreateEmbedding(true);
+ bool bAddContent(true);
+
+ if(basegfx::utils::isRectangle(aClipPolyPolygon))
+ {
+ // ClipRegion is a rectangle, thus it is not expensive to tell
+ // if the content is completely inside or outside of it; get ranges
+ const basegfx::B2DRange aClipRange(aClipPolyPolygon.getB2DRange());
+ const basegfx::B2DRange aContentRange(
+ rContent.getB2DRange(
+ aViewInformation2D));
+
+ if(aClipRange.isInside(aContentRange))
+ {
+ // completely contained, no need to clip at all, so no need for embedding
+ bCreateEmbedding = false;
+ }
+ else if(aClipRange.overlaps(aContentRange))
+ {
+ // overlap; embedding needed. ClipRegion can be minimized by using
+ // the intersection of the ClipRange and the ContentRange. Minimizing
+ // the ClipRegion potentially enhances further processing since
+ // usually clip operations are expensive.
+ basegfx::B2DRange aCommonRange(aContentRange);
+
+ aCommonRange.intersect(aClipRange);
+ aClipPolyPolygon = basegfx::B2DPolyPolygon(basegfx::utils::createPolygonFromRect(aCommonRange));
+ }
+ else
+ {
+ // not inside and no overlap -> completely outside
+ // no need for embedding, no need for content at all
+ bCreateEmbedding = false;
+ bAddContent = false;
+ }
+ }
+ else
+ {
+ // ClipRegion is not a simple rectangle, it would be possible but expensive to
+ // tell if the content needs clipping or not. It is also dependent of
+ // the content's decomposition. To do this, a processor would be needed that
+ // is capable if processing the given sequence of primitives and decide
+ // if all is inside or all is outside. Such a ClipProcessor could be written,
+ // but for now just create the embedding
+ }
+
+ if(bCreateEmbedding)
+ {
+ // redefine target. Use MaskPrimitive2D with created clip
+ // geometry. Using the automatically set mbIsClipPathContent at
+ // SvgStyleAttributes the clip definition is without fill, stroke,
+ // and strokeWidth and forced to black
+ drawinglayer::primitive2d::Primitive2DReference xEmbedTransparence(
+ new drawinglayer::primitive2d::MaskPrimitive2D(
+ aClipPolyPolygon,
+ std::move(rContent)));
+
+ rContent = drawinglayer::primitive2d::Primitive2DContainer { xEmbedTransparence };
+ }
+ else
+ {
+ if(!bAddContent)
+ {
+ rContent.clear();
+ }
+ }
+ }
+ else
+ {
+ // An empty clipping path will completely clip away the element that had
+ // the clip-path property applied. (Svg spec)
+ rContent.clear();
+ }
+ }
+
+} // end of namespace svgio::svgreader
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */