242b7d0162
Change-Id: I100256b63fadeb4a0e4b8e4cbb67e58d2a1ce433 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137096 Tested-by: Jenkins Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
260 lines
10 KiB
C++
260 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <svgclippathnode.hxx>
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#include <drawinglayer/primitive2d/transformprimitive2d.hxx>
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#include <drawinglayer/primitive2d/maskprimitive2d.hxx>
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#include <basegfx/matrix/b2dhommatrixtools.hxx>
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#include <drawinglayer/geometry/viewinformation2d.hxx>
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#include <drawinglayer/processor2d/contourextractor2d.hxx>
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#include <basegfx/polygon/b2dpolypolygoncutter.hxx>
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#include <basegfx/polygon/b2dpolygontools.hxx>
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#include <o3tl/string_view.hxx>
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namespace svgio::svgreader
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{
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SvgClipPathNode::SvgClipPathNode(
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SvgDocument& rDocument,
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SvgNode* pParent)
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: SvgNode(SVGToken::ClipPathNode, rDocument, pParent),
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maSvgStyleAttributes(*this),
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maClipPathUnits(SvgUnits::userSpaceOnUse)
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{
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}
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SvgClipPathNode::~SvgClipPathNode()
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{
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}
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const SvgStyleAttributes* SvgClipPathNode::getSvgStyleAttributes() const
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{
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return &maSvgStyleAttributes;
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}
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void SvgClipPathNode::parseAttribute(const OUString& rTokenName, SVGToken aSVGToken, const OUString& aContent)
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{
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// call parent
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SvgNode::parseAttribute(rTokenName, aSVGToken, aContent);
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// read style attributes
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maSvgStyleAttributes.parseStyleAttribute(aSVGToken, aContent);
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// parse own
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switch(aSVGToken)
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{
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case SVGToken::Style:
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{
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readLocalCssStyle(aContent);
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break;
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}
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case SVGToken::Transform:
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{
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const basegfx::B2DHomMatrix aMatrix(readTransform(aContent, *this));
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if(!aMatrix.isIdentity())
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{
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setTransform(aMatrix);
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}
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break;
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}
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case SVGToken::ClipPathUnits:
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{
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if(!aContent.isEmpty())
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{
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if(o3tl::equalsIgnoreAsciiCase(o3tl::trim(aContent), commonStrings::aStrUserSpaceOnUse))
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{
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setClipPathUnits(SvgUnits::userSpaceOnUse);
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}
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else if(o3tl::equalsIgnoreAsciiCase(o3tl::trim(aContent), commonStrings::aStrObjectBoundingBox))
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{
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setClipPathUnits(SvgUnits::objectBoundingBox);
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}
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}
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break;
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}
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default:
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{
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break;
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}
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}
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}
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void SvgClipPathNode::decomposeSvgNode(drawinglayer::primitive2d::Primitive2DContainer& rTarget, bool bReferenced) const
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{
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drawinglayer::primitive2d::Primitive2DContainer aNewTarget;
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// decompose children
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SvgNode::decomposeSvgNode(aNewTarget, bReferenced);
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if(aNewTarget.empty())
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return;
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if(getTransform())
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{
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// create embedding group element with transformation
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const drawinglayer::primitive2d::Primitive2DReference xRef(
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new drawinglayer::primitive2d::TransformPrimitive2D(
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*getTransform(),
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std::move(aNewTarget)));
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rTarget.push_back(xRef);
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}
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else
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{
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// append to current target
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rTarget.append(aNewTarget);
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}
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}
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void SvgClipPathNode::apply(
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drawinglayer::primitive2d::Primitive2DContainer& rContent,
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const std::optional<basegfx::B2DHomMatrix>& pTransform) const
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{
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if (rContent.empty() || Display::None == getDisplay())
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return;
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const drawinglayer::geometry::ViewInformation2D aViewInformation2D;
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drawinglayer::primitive2d::Primitive2DContainer aClipTarget;
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basegfx::B2DPolyPolygon aClipPolyPolygon;
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// get clipPath definition as primitives
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decomposeSvgNode(aClipTarget, true);
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if(!aClipTarget.empty())
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{
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// extract filled polygons as base for a mask PolyPolygon
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drawinglayer::processor2d::ContourExtractor2D aExtractor(aViewInformation2D, true);
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aExtractor.process(aClipTarget);
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const basegfx::B2DPolyPolygonVector& rResult(aExtractor.getExtractedContour());
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const sal_uInt32 nSize(rResult.size());
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if(nSize > 1)
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{
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// merge to single clipPolyPolygon
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aClipPolyPolygon = basegfx::utils::mergeToSinglePolyPolygon(rResult);
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}
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else
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{
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aClipPolyPolygon = rResult[0];
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}
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}
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if(aClipPolyPolygon.count())
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{
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if (SvgUnits::objectBoundingBox == getClipPathUnits())
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{
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// clip is object-relative, transform using content transformation
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const basegfx::B2DRange aContentRange(rContent.getB2DRange(aViewInformation2D));
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aClipPolyPolygon.transform(
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basegfx::utils::createScaleTranslateB2DHomMatrix(
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aContentRange.getRange(),
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aContentRange.getMinimum()));
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}
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else // userSpaceOnUse
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{
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// #i124852#
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if(pTransform)
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{
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aClipPolyPolygon.transform(*pTransform);
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}
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}
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// #i124313# try to avoid creating an embedding to a MaskPrimitive2D if
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// possible; MaskPrimitive2D processing is potentially expensive
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bool bCreateEmbedding(true);
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bool bAddContent(true);
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if(basegfx::utils::isRectangle(aClipPolyPolygon))
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{
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// ClipRegion is a rectangle, thus it is not expensive to tell
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// if the content is completely inside or outside of it; get ranges
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const basegfx::B2DRange aClipRange(aClipPolyPolygon.getB2DRange());
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const basegfx::B2DRange aContentRange(
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rContent.getB2DRange(
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aViewInformation2D));
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if(aClipRange.isInside(aContentRange))
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{
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// completely contained, no need to clip at all, so no need for embedding
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bCreateEmbedding = false;
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}
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else if(aClipRange.overlaps(aContentRange))
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{
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// overlap; embedding needed. ClipRegion can be minimized by using
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// the intersection of the ClipRange and the ContentRange. Minimizing
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// the ClipRegion potentially enhances further processing since
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// usually clip operations are expensive.
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basegfx::B2DRange aCommonRange(aContentRange);
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aCommonRange.intersect(aClipRange);
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aClipPolyPolygon = basegfx::B2DPolyPolygon(basegfx::utils::createPolygonFromRect(aCommonRange));
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}
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else
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{
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// not inside and no overlap -> completely outside
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// no need for embedding, no need for content at all
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bCreateEmbedding = false;
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bAddContent = false;
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}
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}
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else
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{
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// ClipRegion is not a simple rectangle, it would be possible but expensive to
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// tell if the content needs clipping or not. It is also dependent of
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// the content's decomposition. To do this, a processor would be needed that
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// is capable if processing the given sequence of primitives and decide
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// if all is inside or all is outside. Such a ClipProcessor could be written,
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// but for now just create the embedding
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}
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if(bCreateEmbedding)
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{
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// redefine target. Use MaskPrimitive2D with created clip
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// geometry. Using the automatically set mbIsClipPathContent at
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// SvgStyleAttributes the clip definition is without fill, stroke,
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// and strokeWidth and forced to black
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drawinglayer::primitive2d::Primitive2DReference xEmbedTransparence(
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new drawinglayer::primitive2d::MaskPrimitive2D(
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std::move(aClipPolyPolygon),
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std::move(rContent)));
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rContent = drawinglayer::primitive2d::Primitive2DContainer { xEmbedTransparence };
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}
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else
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{
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if(!bAddContent)
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{
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rContent.clear();
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}
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}
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}
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else
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{
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// An empty clipping path will completely clip away the element that had
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// the clip-path property applied. (Svg spec)
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rContent.clear();
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}
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}
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} // end of namespace svgio::svgreader
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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