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Diffstat (limited to 'svgio/source/svgreader/svgclippathnode.cxx')
| -rw-r--r-- | svgio/source/svgreader/svgclippathnode.cxx | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/svgio/source/svgreader/svgclippathnode.cxx b/svgio/source/svgreader/svgclippathnode.cxx new file mode 100644 index 000000000..31ac632d3 --- /dev/null +++ b/svgio/source/svgreader/svgclippathnode.cxx @@ -0,0 +1,259 @@ +/* -*- 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: */ |