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Diffstat (limited to 'svgio/source/svgreader/svgtextpathnode.cxx')
| -rw-r--r-- | svgio/source/svgreader/svgtextpathnode.cxx | 441 |
1 files changed, 441 insertions, 0 deletions
diff --git a/svgio/source/svgreader/svgtextpathnode.cxx b/svgio/source/svgreader/svgtextpathnode.cxx new file mode 100644 index 000000000..43fccfa43 --- /dev/null +++ b/svgio/source/svgreader/svgtextpathnode.cxx @@ -0,0 +1,441 @@ +/* -*- 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 <svgtextpathnode.hxx> +#include <svgstyleattributes.hxx> +#include <svgpathnode.hxx> +#include <svgdocument.hxx> +#include <basegfx/polygon/b2dpolygon.hxx> +#include <basegfx/polygon/b2dpolygontools.hxx> +#include <drawinglayer/primitive2d/textbreakuphelper.hxx> +#include <drawinglayer/primitive2d/textprimitive2d.hxx> +#include <basegfx/curve/b2dcubicbezier.hxx> +#include <basegfx/curve/b2dbeziertools.hxx> +#include <o3tl/string_view.hxx> + +namespace svgio::svgreader +{ + namespace { + + class pathTextBreakupHelper : public drawinglayer::primitive2d::TextBreakupHelper + { + private: + const basegfx::B2DPolygon& mrPolygon; + const double mfBasegfxPathLength; + double mfPosition; + const basegfx::B2DPoint& mrTextStart; + + const sal_uInt32 mnMaxIndex; + sal_uInt32 mnIndex; + basegfx::B2DCubicBezier maCurrentSegment; + std::unique_ptr<basegfx::B2DCubicBezierHelper> mpB2DCubicBezierHelper; + double mfCurrentSegmentLength; + double mfSegmentStartPosition; + + protected: + /// allow user callback to allow changes to the new TextTransformation. Default + /// does nothing. + virtual bool allowChange(sal_uInt32 nCount, basegfx::B2DHomMatrix& rNewTransform, sal_uInt32 nIndex, sal_uInt32 nLength) override; + + void freeB2DCubicBezierHelper(); + basegfx::B2DCubicBezierHelper* getB2DCubicBezierHelper(); + void advanceToPosition(double fNewPosition); + + public: + pathTextBreakupHelper( + const drawinglayer::primitive2d::TextSimplePortionPrimitive2D& rSource, + const basegfx::B2DPolygon& rPolygon, + const double fBasegfxPathLength, + double fPosition, + const basegfx::B2DPoint& rTextStart); + virtual ~pathTextBreakupHelper() override; + + // read access to evtl. advanced position + double getPosition() const { return mfPosition; } + }; + + } + + void pathTextBreakupHelper::freeB2DCubicBezierHelper() + { + mpB2DCubicBezierHelper.reset(); + } + + basegfx::B2DCubicBezierHelper* pathTextBreakupHelper::getB2DCubicBezierHelper() + { + if(!mpB2DCubicBezierHelper && maCurrentSegment.isBezier()) + { + mpB2DCubicBezierHelper.reset(new basegfx::B2DCubicBezierHelper(maCurrentSegment)); + } + + return mpB2DCubicBezierHelper.get(); + } + + void pathTextBreakupHelper::advanceToPosition(double fNewPosition) + { + while(mfSegmentStartPosition + mfCurrentSegmentLength < fNewPosition && mnIndex < mnMaxIndex) + { + mfSegmentStartPosition += mfCurrentSegmentLength; + mnIndex++; + + if(mnIndex < mnMaxIndex) + { + freeB2DCubicBezierHelper(); + mrPolygon.getBezierSegment(mnIndex % mrPolygon.count(), maCurrentSegment); + maCurrentSegment.testAndSolveTrivialBezier(); + mfCurrentSegmentLength = getB2DCubicBezierHelper() + ? getB2DCubicBezierHelper()->getLength() + : maCurrentSegment.getLength(); + } + } + + mfPosition = fNewPosition; + } + + pathTextBreakupHelper::pathTextBreakupHelper( + const drawinglayer::primitive2d::TextSimplePortionPrimitive2D& rSource, + const basegfx::B2DPolygon& rPolygon, + const double fBasegfxPathLength, + double fPosition, + const basegfx::B2DPoint& rTextStart) + : drawinglayer::primitive2d::TextBreakupHelper(rSource), + mrPolygon(rPolygon), + mfBasegfxPathLength(fBasegfxPathLength), + mfPosition(0.0), + mrTextStart(rTextStart), + mnMaxIndex(rPolygon.isClosed() ? rPolygon.count() : rPolygon.count() - 1), + mnIndex(0), + mfCurrentSegmentLength(0.0), + mfSegmentStartPosition(0.0) + { + mrPolygon.getBezierSegment(mnIndex % mrPolygon.count(), maCurrentSegment); + mfCurrentSegmentLength = maCurrentSegment.getLength(); + + advanceToPosition(fPosition); + } + + pathTextBreakupHelper::~pathTextBreakupHelper() + { + freeB2DCubicBezierHelper(); + } + + bool pathTextBreakupHelper::allowChange(sal_uInt32 /*nCount*/, basegfx::B2DHomMatrix& rNewTransform, sal_uInt32 nIndex, sal_uInt32 nLength) + { + bool bRetval(false); + + if(mfPosition < mfBasegfxPathLength && nLength && mnIndex < mnMaxIndex) + { + const double fSnippetWidth( + getTextLayouter().getTextWidth( + getSource().getText(), + nIndex, + nLength)); + + if(basegfx::fTools::more(fSnippetWidth, 0.0)) + { + const OUString aText(getSource().getText()); + const std::u16string_view aTrimmedChars(o3tl::trim(aText.subView(nIndex, nLength))); + const double fEndPos(mfPosition + fSnippetWidth); + + if(!aTrimmedChars.empty() && (mfPosition < mfBasegfxPathLength || fEndPos > 0.0)) + { + const double fHalfSnippetWidth(fSnippetWidth * 0.5); + + advanceToPosition(mfPosition + fHalfSnippetWidth); + + // create representation for this snippet + bRetval = true; + + // get target position and tangent in that point + basegfx::B2DPoint aPosition(0.0, 0.0); + basegfx::B2DVector aTangent(0.0, 1.0); + + if(mfPosition < 0.0) + { + // snippet center is left of first segment, but right edge is on it (SVG allows that) + aTangent = maCurrentSegment.getTangent(0.0); + aTangent.normalize(); + aPosition = maCurrentSegment.getStartPoint() + (aTangent * (mfPosition - mfSegmentStartPosition)); + } + else if(mfPosition > mfBasegfxPathLength) + { + // snippet center is right of last segment, but left edge is on it (SVG allows that) + aTangent = maCurrentSegment.getTangent(1.0); + aTangent.normalize(); + aPosition = maCurrentSegment.getEndPoint() + (aTangent * (mfPosition - mfSegmentStartPosition)); + } + else + { + // snippet center inside segment, interpolate + double fBezierDistance(mfPosition - mfSegmentStartPosition); + + if(getB2DCubicBezierHelper()) + { + // use B2DCubicBezierHelper to bridge the non-linear gap between + // length and bezier distances (if it's a bezier segment) + fBezierDistance = getB2DCubicBezierHelper()->distanceToRelative(fBezierDistance); + } + else + { + // linear relationship, make relative to segment length + fBezierDistance = fBezierDistance / mfCurrentSegmentLength; + } + + aPosition = maCurrentSegment.interpolatePoint(fBezierDistance); + aTangent = maCurrentSegment.getTangent(fBezierDistance); + aTangent.normalize(); + } + + // detect evtl. hor/ver translations (depends on text direction) + const basegfx::B2DPoint aBasePoint(rNewTransform * basegfx::B2DPoint(0.0, 0.0)); + const basegfx::B2DVector aOffset(aBasePoint - mrTextStart); + + if(!basegfx::fTools::equalZero(aOffset.getY())) + { + // ...and apply + aPosition.setY(aPosition.getY() + aOffset.getY()); + } + + // move target position from snippet center to left text start + aPosition -= fHalfSnippetWidth * aTangent; + + // remove current translation + rNewTransform.translate(-aBasePoint.getX(), -aBasePoint.getY()); + + // rotate due to tangent + rNewTransform.rotate(atan2(aTangent.getY(), aTangent.getX())); + + // add new translation + rNewTransform.translate(aPosition.getX(), aPosition.getY()); + } + + // advance to end + advanceToPosition(fEndPos); + } + } + + return bRetval; + } + +} // end of namespace svgio::svgreader + + +namespace svgio::svgreader +{ + SvgTextPathNode::SvgTextPathNode( + SvgDocument& rDocument, + SvgNode* pParent) + : SvgNode(SVGToken::TextPath, rDocument, pParent), + maSvgStyleAttributes(*this) + { + } + + SvgTextPathNode::~SvgTextPathNode() + { + } + + const SvgStyleAttributes* SvgTextPathNode::getSvgStyleAttributes() const + { + return &maSvgStyleAttributes; + } + + void SvgTextPathNode::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::StartOffset: + { + SvgNumber aNum; + + if(readSingleNumber(aContent, aNum)) + { + if(aNum.isPositive()) + { + maStartOffset = aNum; + } + } + break; + } + case SVGToken::Method: + { + break; + } + case SVGToken::Spacing: + { + break; + } + case SVGToken::Href: + case SVGToken::XlinkHref: + { + const sal_Int32 nLen(aContent.getLength()); + + if(nLen && '#' == aContent[0]) + { + maXLink = aContent.copy(1); + } + break; + } + default: + { + break; + } + } + } + + bool SvgTextPathNode::isValid() const + { + const SvgPathNode* pSvgPathNode = dynamic_cast< const SvgPathNode* >(getDocument().findSvgNodeById(maXLink)); + + if(!pSvgPathNode) + { + return false; + } + + const std::optional<basegfx::B2DPolyPolygon>& pPolyPolyPath = pSvgPathNode->getPath(); + + if(!pPolyPolyPath || !pPolyPolyPath->count()) + { + return false; + } + + const basegfx::B2DPolygon aPolygon(pPolyPolyPath->getB2DPolygon(0)); + + if(!aPolygon.count()) + { + return false; + } + + const double fBasegfxPathLength(basegfx::utils::getLength(aPolygon)); + + return !basegfx::fTools::equalZero(fBasegfxPathLength); + } + + void SvgTextPathNode::decomposePathNode( + const drawinglayer::primitive2d::Primitive2DContainer& rPathContent, + drawinglayer::primitive2d::Primitive2DContainer& rTarget, + const basegfx::B2DPoint& rTextStart) const + { + if(rPathContent.empty()) + return; + + const SvgPathNode* pSvgPathNode = dynamic_cast< const SvgPathNode* >(getDocument().findSvgNodeById(maXLink)); + + if(!pSvgPathNode) + return; + + const std::optional<basegfx::B2DPolyPolygon>& pPolyPolyPath = pSvgPathNode->getPath(); + + if(!(pPolyPolyPath && pPolyPolyPath->count())) + return; + + basegfx::B2DPolygon aPolygon(pPolyPolyPath->getB2DPolygon(0)); + + if(pSvgPathNode->getTransform()) + { + aPolygon.transform(*pSvgPathNode->getTransform()); + } + + const double fBasegfxPathLength(basegfx::utils::getLength(aPolygon)); + + if(basegfx::fTools::equalZero(fBasegfxPathLength)) + return; + + double fUserToBasegfx(1.0); // multiply: user->basegfx, divide: basegfx->user + + if(pSvgPathNode->getPathLength().isSet()) + { + const double fUserLength(pSvgPathNode->getPathLength().solve(*this)); + + if(fUserLength > 0.0 && !basegfx::fTools::equal(fUserLength, fBasegfxPathLength)) + { + fUserToBasegfx = fUserLength / fBasegfxPathLength; + } + } + + double fPosition(0.0); + + if(getStartOffset().isSet()) + { + if (SvgUnit::percent == getStartOffset().getUnit()) + { + // percent are relative to path length + fPosition = getStartOffset().getNumber() * 0.01 * fBasegfxPathLength; + } + else + { + fPosition = getStartOffset().solve(*this) * fUserToBasegfx; + } + } + + if(fPosition < 0.0) + return; + + const sal_Int32 nLength(rPathContent.size()); + sal_Int32 nCurrent(0); + + while(fPosition < fBasegfxPathLength && nCurrent < nLength) + { + const drawinglayer::primitive2d::TextSimplePortionPrimitive2D* pCandidate = nullptr; + const drawinglayer::primitive2d::Primitive2DReference xReference(rPathContent[nCurrent]); + + if(xReference.is()) + { + pCandidate = dynamic_cast< const drawinglayer::primitive2d::TextSimplePortionPrimitive2D* >(xReference.get()); + } + + if(pCandidate) + { + pathTextBreakupHelper aPathTextBreakupHelper( + *pCandidate, + aPolygon, + fBasegfxPathLength, + fPosition, + rTextStart); + + drawinglayer::primitive2d::Primitive2DContainer aResult = + aPathTextBreakupHelper.extractResult(); + + if(!aResult.empty()) + { + rTarget.append(std::move(aResult)); + } + + // advance position to consumed + fPosition = aPathTextBreakupHelper.getPosition(); + } + + nCurrent++; + } + } + +} // end of namespace svgio + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |