Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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: */