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, 1149 insertions, 0 deletions

diff --git a/basegfx/source/polygon/b2dpolypolygoncutter.cxx b/basegfx/source/polygon/b2dpolypolygoncutter.cxx
new file mode 100644
index 000000000..b548939f3
--- /dev/null
+++ b/basegfx/source/polygon/b2dpolypolygoncutter.cxx
@@ -0,0 +1,1149 @@
+/* -*- 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 <basegfx/numeric/ftools.hxx>
+#include <basegfx/polygon/b2dpolypolygoncutter.hxx>
+#include <basegfx/point/b2dpoint.hxx>
+#include <basegfx/vector/b2dvector.hxx>
+#include <basegfx/polygon/b2dpolygon.hxx>
+#include <basegfx/polygon/b2dpolygontools.hxx>
+#include <basegfx/polygon/b2dpolygoncutandtouch.hxx>
+#include <basegfx/range/b2drange.hxx>
+#include <basegfx/polygon/b2dpolypolygontools.hxx>
+#include <basegfx/curve/b2dcubicbezier.hxx>
+#include <sal/log.hxx>
+#include <utility>
+#include <vector>
+#include <algorithm>
+
+namespace basegfx
+{
+    namespace
+    {
+
+        struct StripHelper
+        {
+            B2DRange                                maRange;
+            sal_Int32                               mnDepth;
+            B2VectorOrientation                     meOrinetation;
+        };
+
+        struct PN
+        {
+        public:
+            B2DPoint                maPoint;
+            sal_uInt32              mnI;
+            sal_uInt32              mnIP;
+            sal_uInt32              mnIN;
+        };
+
+        struct VN
+        {
+        public:
+            B2DVector               maPrev;
+            B2DVector               maNext;
+
+            // to have the correct curve segments in the crossover checks,
+            // it is necessary to keep the original next vectors, too. Else,
+            // it may happen to use an already switched next vector which
+            // would interpolate the wrong comparison point
+            B2DVector               maOriginalNext;
+        };
+
+        struct SN
+        {
+        public:
+            PN*                     mpPN;
+
+            bool operator<(const SN& rComp) const
+            {
+                if(fTools::equal(mpPN->maPoint.getX(), rComp.mpPN->maPoint.getX()))
+                {
+                    if(fTools::equal(mpPN->maPoint.getY(), rComp.mpPN->maPoint.getY()))
+                    {
+                        return (mpPN->mnI < rComp.mpPN->mnI);
+                    }
+                    else
+                    {
+                        return fTools::less(mpPN->maPoint.getY(), rComp.mpPN->maPoint.getY());
+                    }
+                }
+                else
+                {
+                    return fTools::less(mpPN->maPoint.getX(), rComp.mpPN->maPoint.getX());
+                }
+            }
+        };
+
+        typedef std::vector< PN > PNV;
+        typedef std::vector< VN > VNV;
+        typedef std::vector< SN > SNV;
+        typedef std::pair< basegfx::B2DPoint /*orig*/, basegfx::B2DPoint /*repl*/ > CorrectionPair;
+
+        class solver
+        {
+        private:
+            const B2DPolyPolygon    maOriginal;
+            PNV                     maPNV;
+            VNV                     maVNV;
+            SNV                     maSNV;
+            std::vector< CorrectionPair >
+                                    maCorrectionTable;
+
+            bool                    mbIsCurve : 1;
+            bool                    mbChanged : 1;
+
+            void impAddPolygon(const sal_uInt32 aPos, const B2DPolygon& rGeometry)
+            {
+                const sal_uInt32 nCount(rGeometry.count());
+                PN aNewPN;
+                VN aNewVN;
+                SN aNewSN;
+
+                for(sal_uInt32 a(0); a < nCount; a++)
+                {
+                    const B2DPoint aPoint(rGeometry.getB2DPoint(a));
+                    aNewPN.maPoint = aPoint;
+                    aNewPN.mnI = aPos + a;
+                    aNewPN.mnIP = aPos + ((a != 0) ? a - 1 : nCount - 1);
+                    aNewPN.mnIN = aPos + ((a + 1 == nCount) ? 0 : a + 1);
+                    maPNV.push_back(aNewPN);
+
+                    if(mbIsCurve)
+                    {
+                        aNewVN.maPrev = rGeometry.getPrevControlPoint(a) - aPoint;
+                        aNewVN.maNext = rGeometry.getNextControlPoint(a) - aPoint;
+                        aNewVN.maOriginalNext = aNewVN.maNext;
+                        maVNV.push_back(aNewVN);
+                    }
+
+                    aNewSN.mpPN = &maPNV[maPNV.size() - 1];
+                    maSNV.push_back(aNewSN);
+                }
+            }
+
+            static bool impLeftOfEdges(const B2DVector& rVecA, const B2DVector& rVecB, const B2DVector& rTest)
+            {
+                // tests if rTest is left of both directed line segments along the line -rVecA, rVecB. Test is
+                // with border.
+                if(rVecA.cross(rVecB) > 0.0)
+                {
+                    // b is left turn seen from a, test if Test is left of both and so inside (left is seen as inside)
+                    const bool bBoolA(fTools::moreOrEqual(rVecA.cross(rTest), 0.0));
+                    const bool bBoolB(fTools::lessOrEqual(rVecB.cross(rTest), 0.0));
+
+                    return (bBoolA && bBoolB);
+                }
+                else
+                {
+                    // b is right turn seen from a, test if Test is right of both and so outside (left is seen as inside)
+                    const bool bBoolA(fTools::lessOrEqual(rVecA.cross(rTest), 0.0));
+                    const bool bBoolB(fTools::moreOrEqual(rVecB.cross(rTest), 0.0));
+
+                    return (!(bBoolA && bBoolB));
+                }
+            }
+
+            void impSwitchNext(PN& rPNa, PN& rPNb)
+            {
+                std::swap(rPNa.mnIN, rPNb.mnIN);
+
+                if(mbIsCurve)
+                {
+                    VN& rVNa = maVNV[rPNa.mnI];
+                    VN& rVNb = maVNV[rPNb.mnI];
+
+                    std::swap(rVNa.maNext, rVNb.maNext);
+                }
+
+                if(!mbChanged)
+                {
+                    mbChanged = true;
+                }
+            }
+
+            B2DCubicBezier createSegment(const PN& rPN, bool bPrev) const
+            {
+                const B2DPoint& rStart(rPN.maPoint);
+                const B2DPoint& rEnd(maPNV[bPrev ? rPN.mnIP : rPN.mnIN].maPoint);
+                const B2DVector& rCPA(bPrev ? maVNV[rPN.mnI].maPrev : maVNV[rPN.mnI].maNext);
+                // Use maOriginalNext, not maNext to create the original (yet unchanged)
+                // curve segment. Otherwise, this segment would NOT ne correct.
+                const B2DVector& rCPB(bPrev ? maVNV[maPNV[rPN.mnIP].mnI].maOriginalNext : maVNV[maPNV[rPN.mnIN].mnI].maPrev);
+
+                return B2DCubicBezier(rStart, rStart + rCPA, rEnd + rCPB, rEnd);
+            }
+
+            void impHandleCommon(PN& rPNa, PN& rPNb)
+            {
+                if(mbIsCurve)
+                {
+                    const B2DCubicBezier aNextA(createSegment(rPNa, false));
+                    const B2DCubicBezier aPrevA(createSegment(rPNa, true));
+
+                    if(aNextA.equal(aPrevA))
+                    {
+                        // deadend on A (identical edge)
+                        return;
+                    }
+
+                    const B2DCubicBezier aNextB(createSegment(rPNb, false));
+                    const B2DCubicBezier aPrevB(createSegment(rPNb, true));
+
+                    if(aNextB.equal(aPrevB))
+                    {
+                        // deadend on B (identical edge)
+                        return;
+                    }
+
+                    if(aPrevA.equal(aPrevB))
+                    {
+                        // common edge in same direction
+                        return;
+                    }
+                    else if(aPrevA.equal(aNextB))
+                    {
+                        // common edge in opposite direction
+                        if(aNextA.equal(aPrevB))
+                        {
+                            // common edge in opposite direction continues
+                            return;
+                        }
+                        else
+                        {
+                            // common edge in opposite direction leave
+                            impSwitchNext(rPNa, rPNb);
+                        }
+                    }
+                    else if(aNextA.equal(aNextB))
+                    {
+                        // common edge in same direction enter
+                        // search leave edge
+                        PN* pPNa2 = &maPNV[rPNa.mnIN];
+                        PN* pPNb2 = &maPNV[rPNb.mnIN];
+                        bool bOnEdge(true);
+
+                        do
+                        {
+                            const B2DCubicBezier aNextA2(createSegment(*pPNa2, false));
+                            const B2DCubicBezier aNextB2(createSegment(*pPNb2, false));
+
+                            if(aNextA2.equal(aNextB2))
+                            {
+                                pPNa2 = &maPNV[pPNa2->mnIN];
+                                pPNb2 = &maPNV[pPNb2->mnIN];
+                            }
+                            else
+                            {
+                                bOnEdge = false;
+                            }
+                        }
+                        while(bOnEdge && pPNa2 != &rPNa && pPNb2 != &rPNb);
+
+                        if(bOnEdge)
+                        {
+                            // loop over two identical polygon paths
+                            return;
+                        }
+                        else
+                        {
+                            // enter at rPNa, rPNb; leave at pPNa2, pPNb2. No common edges
+                            // at enter/leave. Check for crossover.
+                            const B2DVector aPrevCA(aPrevA.interpolatePoint(0.5) - aPrevA.getStartPoint());
+                            const B2DVector aNextCA(aNextA.interpolatePoint(0.5) - aNextA.getStartPoint());
+                            const B2DVector aPrevCB(aPrevB.interpolatePoint(0.5) - aPrevB.getStartPoint());
+                            const bool bEnter(impLeftOfEdges(aPrevCA, aNextCA, aPrevCB));
+
+                            const B2DCubicBezier aNextA2(createSegment(*pPNa2, false));
+                            const B2DCubicBezier aPrevA2(createSegment(*pPNa2, true));
+                            const B2DCubicBezier aNextB2(createSegment(*pPNb2, false));
+                            const B2DVector aPrevCA2(aPrevA2.interpolatePoint(0.5) - aPrevA2.getStartPoint());
+                            const B2DVector aNextCA2(aNextA2.interpolatePoint(0.5) - aNextA2.getStartPoint());
+                            const B2DVector aNextCB2(aNextB2.interpolatePoint(0.5) - aNextB2.getStartPoint());
+                            const bool bLeave(impLeftOfEdges(aPrevCA2, aNextCA2, aNextCB2));
+
+                            if(bEnter != bLeave)
+                            {
+                                // crossover
+                                impSwitchNext(rPNa, rPNb);
+                            }
+                        }
+                    }
+                    else if(aNextA.equal(aPrevB))
+                    {
+                        // common edge in opposite direction enter
+                        impSwitchNext(rPNa, rPNb);
+                    }
+                    else
+                    {
+                        // no common edges, check for crossover
+                        const B2DVector aPrevCA(aPrevA.interpolatePoint(0.5) - aPrevA.getStartPoint());
+                        const B2DVector aNextCA(aNextA.interpolatePoint(0.5) - aNextA.getStartPoint());
+                        const B2DVector aPrevCB(aPrevB.interpolatePoint(0.5) - aPrevB.getStartPoint());
+                        const B2DVector aNextCB(aNextB.interpolatePoint(0.5) - aNextB.getStartPoint());
+
+                        const bool bEnter(impLeftOfEdges(aPrevCA, aNextCA, aPrevCB));
+                        const bool bLeave(impLeftOfEdges(aPrevCA, aNextCA, aNextCB));
+
+                        if(bEnter != bLeave)
+                        {
+                            // crossover
+                            impSwitchNext(rPNa, rPNb);
+                        }
+                    }
+                }
+                else
+                {
+                    const B2DPoint& rNextA(maPNV[rPNa.mnIN].maPoint);
+                    const B2DPoint& rPrevA(maPNV[rPNa.mnIP].maPoint);
+
+                    if(rNextA.equal(rPrevA))
+                    {
+                        // deadend on A
+                        return;
+                    }
+
+                    const B2DPoint& rNextB(maPNV[rPNb.mnIN].maPoint);
+                    const B2DPoint& rPrevB(maPNV[rPNb.mnIP].maPoint);
+
+                    if(rNextB.equal(rPrevB))
+                    {
+                        // deadend on B
+                        return;
+                    }
+
+                    if(rPrevA.equal(rPrevB))
+                    {
+                        // common edge in same direction
+                        return;
+                    }
+                    else if(rPrevA.equal(rNextB))
+                    {
+                        // common edge in opposite direction
+                        if(rNextA.equal(rPrevB))
+                        {
+                            // common edge in opposite direction continues
+                            return;
+                        }
+                        else
+                        {
+                            // common edge in opposite direction leave
+                            impSwitchNext(rPNa, rPNb);
+                        }
+                    }
+                    else if(rNextA.equal(rNextB))
+                    {
+                        // common edge in same direction enter
+                        // search leave edge
+                        PN* pPNa2 = &maPNV[rPNa.mnIN];
+                        PN* pPNb2 = &maPNV[rPNb.mnIN];
+                        bool bOnEdge(true);
+
+                        do
+                        {
+                            const B2DPoint& rNextA2(maPNV[pPNa2->mnIN].maPoint);
+                            const B2DPoint& rNextB2(maPNV[pPNb2->mnIN].maPoint);
+
+                            if(rNextA2.equal(rNextB2))
+                            {
+                                pPNa2 = &maPNV[pPNa2->mnIN];
+                                pPNb2 = &maPNV[pPNb2->mnIN];
+                            }
+                            else
+                            {
+                                bOnEdge = false;
+                            }
+                        }
+                        while(bOnEdge && pPNa2 != &rPNa && pPNb2 != &rPNb);
+
+                        if(bOnEdge)
+                        {
+                            // loop over two identical polygon paths
+                            return;
+                        }
+                        else
+                        {
+                            // enter at rPNa, rPNb; leave at pPNa2, pPNb2. No common edges
+                            // at enter/leave. Check for crossover.
+                            const B2DPoint& aPointE(rPNa.maPoint);
+                            const B2DVector aPrevAE(rPrevA - aPointE);
+                            const B2DVector aNextAE(rNextA - aPointE);
+                            const B2DVector aPrevBE(rPrevB - aPointE);
+
+                            const B2DPoint& aPointL(pPNa2->maPoint);
+                            const B2DVector aPrevAL(maPNV[pPNa2->mnIP].maPoint - aPointL);
+                            const B2DVector aNextAL(maPNV[pPNa2->mnIN].maPoint - aPointL);
+                            const B2DVector aNextBL(maPNV[pPNb2->mnIN].maPoint - aPointL);
+
+                            const bool bEnter(impLeftOfEdges(aPrevAE, aNextAE, aPrevBE));
+                            const bool bLeave(impLeftOfEdges(aPrevAL, aNextAL, aNextBL));
+
+                            if(bEnter != bLeave)
+                            {
+                                // crossover; switch start or end
+                                impSwitchNext(rPNa, rPNb);
+                            }
+                        }
+                    }
+                    else if(rNextA.equal(rPrevB))
+                    {
+                        // common edge in opposite direction enter
+                        impSwitchNext(rPNa, rPNb);
+                    }
+                    else
+                    {
+                        // no common edges, check for crossover
+                        const B2DPoint& aPoint(rPNa.maPoint);
+                        const B2DVector aPrevA(rPrevA - aPoint);
+                        const B2DVector aNextA(rNextA - aPoint);
+                        const B2DVector aPrevB(rPrevB - aPoint);
+                        const B2DVector aNextB(rNextB - aPoint);
+
+                        const bool bEnter(impLeftOfEdges(aPrevA, aNextA, aPrevB));
+                        const bool bLeave(impLeftOfEdges(aPrevA, aNextA, aNextB));
+
+                        if(bEnter != bLeave)
+                        {
+                            // crossover
+                            impSwitchNext(rPNa, rPNb);
+                        }
+                    }
+                }
+            }
+
+            void impSolve()
+            {
+                // sort by point to identify common nodes easier
+                std::sort(maSNV.begin(), maSNV.end());
+
+                // handle common nodes
+                const sal_uInt32 nNodeCount(maSNV.size());
+                sal_uInt32 a(0);
+
+                // snap unsharp-equal points
+                if(nNodeCount)
+                {
+                    basegfx::B2DPoint* pLast(&maSNV[0].mpPN->maPoint);
+
+                    for(a = 1; a < nNodeCount; a++)
+                    {
+                        basegfx::B2DPoint* pCurrent(&maSNV[a].mpPN->maPoint);
+
+                        if(pLast->equal(*pCurrent) && (pLast->getX() != pCurrent->getX() || pLast->getY() != pCurrent->getY()))
+                        {
+                            const basegfx::B2DPoint aMiddle((*pLast + *pCurrent) * 0.5);
+
+                            if(pLast->getX() != aMiddle.getX() || pLast->getY() != aMiddle.getY())
+                            {
+                                maCorrectionTable.emplace_back(*pLast, aMiddle);
+                                *pLast = aMiddle;
+                            }
+
+                            if(pCurrent->getX() != aMiddle.getX() || pCurrent->getY() != aMiddle.getY())
+                            {
+                                maCorrectionTable.emplace_back(*pCurrent, aMiddle);
+                                *pCurrent = aMiddle;
+                            }
+                        }
+
+                        pLast = pCurrent;
+                    }
+                }
+
+                for(a = 0; a < nNodeCount - 1; a++)
+                {
+                    // test a before using it, not after. Also use nPointCount instead of aSortNodes.size()
+                    PN& rPNb = *(maSNV[a].mpPN);
+
+                    for(sal_uInt32 b(a + 1); b < nNodeCount && rPNb.maPoint.equal(maSNV[b].mpPN->maPoint); b++)
+                    {
+                        impHandleCommon(rPNb, *maSNV[b].mpPN);
+                    }
+                }
+            }
+
+        public:
+            explicit solver(const B2DPolygon& rOriginal)
+            :   maOriginal(B2DPolyPolygon(rOriginal)),
+                mbIsCurve(false),
+                mbChanged(false)
+            {
+                const sal_uInt32 nOriginalCount(rOriginal.count());
+
+                if(!nOriginalCount)
+                    return;
+
+                B2DPolygon aGeometry(utils::addPointsAtCutsAndTouches(rOriginal));
+                aGeometry.removeDoublePoints();
+                aGeometry = utils::simplifyCurveSegments(aGeometry);
+                mbIsCurve = aGeometry.areControlPointsUsed();
+
+                const sal_uInt32 nPointCount(aGeometry.count());
+
+                // If it's not a bezier polygon, at least four points are needed to create
+                // a self-intersection. If it's a bezier polygon, the minimum point number
+                // is two, since with a single point You get a curve, but no self-intersection
+                if(!(nPointCount > 3 || (nPointCount > 1 && mbIsCurve)))
+                    return;
+
+                // reserve space in point, control and sort vector.
+                maSNV.reserve(nPointCount);
+                maPNV.reserve(nPointCount);
+                maVNV.reserve(mbIsCurve ? nPointCount : 0);
+
+                // fill data
+                impAddPolygon(0, aGeometry);
+
+                // solve common nodes
+                impSolve();
+            }
+
+            explicit solver(B2DPolyPolygon aOriginal, size_t* pPointLimit = nullptr)
+            :   maOriginal(std::move(aOriginal)),
+                mbIsCurve(false),
+                mbChanged(false)
+            {
+                sal_uInt32 nOriginalCount(maOriginal.count());
+
+                if(!nOriginalCount)
+                    return;
+
+                B2DPolyPolygon aGeometry(utils::addPointsAtCutsAndTouches(maOriginal, pPointLimit));
+                aGeometry.removeDoublePoints();
+                aGeometry = utils::simplifyCurveSegments(aGeometry);
+                mbIsCurve = aGeometry.areControlPointsUsed();
+                nOriginalCount = aGeometry.count();
+
+                if(!nOriginalCount)
+                    return;
+
+                sal_uInt32 nPointCount(0);
+                sal_uInt32 a(0);
+
+                // count points
+                for(a = 0; a < nOriginalCount; a++)
+                {
+                    const B2DPolygon& aCandidate(aGeometry.getB2DPolygon(a));
+                    const sal_uInt32 nCandCount(aCandidate.count());
+
+                    // If it's not a bezier curve, at least three points would be needed to have a
+                    // topological relevant (not empty) polygon. Since it's not known here if trivial
+                    // edges (dead ends) will be kept or sorted out, add non-bezier polygons with
+                    // more than one point.
+                    // For bezier curves, the minimum for defining an area is also one.
+                    if(nCandCount)
+                    {
+                        nPointCount += nCandCount;
+                    }
+                }
+
+                if(!nPointCount)
+                    return;
+
+                // reserve space in point, control and sort vector.
+                maSNV.reserve(nPointCount);
+                maPNV.reserve(nPointCount);
+                maVNV.reserve(mbIsCurve ? nPointCount : 0);
+
+                // fill data
+                sal_uInt32 nInsertIndex(0);
+
+                for(a = 0; a < nOriginalCount; a++)
+                {
+                    const B2DPolygon& aCandidate(aGeometry.getB2DPolygon(a));
+                    const sal_uInt32 nCandCount(aCandidate.count());
+
+                    // use same condition as above, the data vector is
+                    // pre-allocated
+                    if(nCandCount)
+                    {
+                        impAddPolygon(nInsertIndex, aCandidate);
+                        nInsertIndex += nCandCount;
+                    }
+                }
+
+                // solve common nodes
+                impSolve();
+            }
+
+            B2DPolyPolygon getB2DPolyPolygon()
+            {
+                if(mbChanged)
+                {
+                    B2DPolyPolygon aRetval;
+                    const sal_uInt32 nCount(maPNV.size());
+                    sal_uInt32 nCountdown(nCount);
+
+                    for(sal_uInt32 a(0); nCountdown && a < nCount; a++)
+                    {
+                        PN& rPN = maPNV[a];
+
+                        if(rPN.mnI != SAL_MAX_UINT32)
+                        {
+                            // unused node, start new part polygon
+                            B2DPolygon aNewPart;
+                            PN* pPNCurr = &rPN;
+
+                            do
+                            {
+                                const B2DPoint& rPoint = pPNCurr->maPoint;
+                                aNewPart.append(rPoint);
+
+                                if(mbIsCurve)
+                                {
+                                    const VN& rVNCurr = maVNV[pPNCurr->mnI];
+
+                                    if(!rVNCurr.maPrev.equalZero())
+                                    {
+                                        aNewPart.setPrevControlPoint(aNewPart.count() - 1, rPoint + rVNCurr.maPrev);
+                                    }
+
+                                    if(!rVNCurr.maNext.equalZero())
+                                    {
+                                        aNewPart.setNextControlPoint(aNewPart.count() - 1, rPoint + rVNCurr.maNext);
+                                    }
+                                }
+
+                                pPNCurr->mnI = SAL_MAX_UINT32;
+                                nCountdown--;
+                                pPNCurr = &(maPNV[pPNCurr->mnIN]);
+                            }
+                            while(pPNCurr != &rPN && pPNCurr->mnI != SAL_MAX_UINT32);
+
+                            // close and add
+                            aNewPart.setClosed(true);
+                            aRetval.append(aNewPart);
+                        }
+                    }
+
+                    return aRetval;
+                }
+                else
+                {
+                    const sal_uInt32 nCorrectionSize(maCorrectionTable.size());
+
+                    // no change, return original
+                    if(!nCorrectionSize)
+                    {
+                        return maOriginal;
+                    }
+
+                    // apply coordinate corrections to ensure inside/outside correctness after solving
+                    const sal_uInt32 nPolygonCount(maOriginal.count());
+                    basegfx::B2DPolyPolygon aRetval(maOriginal);
+
+                    for(sal_uInt32 a(0); a < nPolygonCount; a++)
+                    {
+                        basegfx::B2DPolygon aTemp(aRetval.getB2DPolygon(a));
+                        const sal_uInt32 nPointCount(aTemp.count());
+                        bool bChanged(false);
+
+                        for(sal_uInt32 b(0); b < nPointCount; b++)
+                        {
+                            const basegfx::B2DPoint aCandidate(aTemp.getB2DPoint(b));
+
+                            for(sal_uInt32 c(0); c < nCorrectionSize; c++)
+                            {
+                                if(maCorrectionTable[c].first.getX() == aCandidate.getX() && maCorrectionTable[c].first.getY() == aCandidate.getY())
+                                {
+                                    aTemp.setB2DPoint(b, maCorrectionTable[c].second);
+                                    bChanged = true;
+                                }
+                            }
+                        }
+
+                        if(bChanged)
+                        {
+                            aRetval.setB2DPolygon(a, aTemp);
+                        }
+                    }
+
+                    return aRetval;
+                }
+            }
+        };
+
+    } // end of anonymous namespace
+} // end of namespace basegfx
+
+namespace basegfx::utils
+{
+
+        B2DPolyPolygon solveCrossovers(const B2DPolyPolygon& rCandidate, size_t* pPointLimit)
+        {
+            if(rCandidate.count() > 0)
+            {
+                solver aSolver(rCandidate, pPointLimit);
+                return aSolver.getB2DPolyPolygon();
+            }
+            else
+            {
+                return rCandidate;
+            }
+        }
+
+        B2DPolyPolygon solveCrossovers(const B2DPolygon& rCandidate)
+        {
+            solver aSolver(rCandidate);
+            return aSolver.getB2DPolyPolygon();
+        }
+
+        B2DPolyPolygon stripNeutralPolygons(const B2DPolyPolygon& rCandidate)
+        {
+            B2DPolyPolygon aRetval;
+
+            for(sal_uInt32 a(0); a < rCandidate.count(); a++)
+            {
+                const B2DPolygon& aCandidate(rCandidate.getB2DPolygon(a));
+
+                if(utils::getOrientation(aCandidate) != B2VectorOrientation::Neutral)
+                {
+                    aRetval.append(aCandidate);
+                }
+            }
+
+            return aRetval;
+        }
+
+        B2DPolyPolygon createNonzeroConform(const B2DPolyPolygon& rCandidate)
+        {
+            if (rCandidate.count() > 1000)
+            {
+                SAL_WARN("basegfx", "this poly is too large, " << rCandidate.count() << " elements, to be able to process timeously, falling back to ignoring the winding rule, which is likely to cause rendering artifacts");
+                return rCandidate;
+            }
+
+            B2DPolyPolygon aCandidate;
+
+            // remove all self-intersections and intersections
+            if(rCandidate.count() == 1)
+            {
+                aCandidate = basegfx::utils::solveCrossovers(rCandidate.getB2DPolygon(0));
+            }
+            else
+            {
+                aCandidate = basegfx::utils::solveCrossovers(rCandidate);
+            }
+
+            // cleanup evtl. neutral polygons
+            aCandidate = basegfx::utils::stripNeutralPolygons(aCandidate);
+
+            // remove all polygons which have the same orientation as the polygon they are directly contained in
+            const sal_uInt32 nCount(aCandidate.count());
+
+            if(nCount > 1)
+            {
+                sal_uInt32 a, b;
+                std::vector< StripHelper > aHelpers;
+                aHelpers.resize(nCount);
+
+                for(a = 0; a < nCount; a++)
+                {
+                    const B2DPolygon& aCand(aCandidate.getB2DPolygon(a));
+                    StripHelper* pNewHelper = &(aHelpers[a]);
+                    pNewHelper->maRange = utils::getRange(aCand);
+                    pNewHelper->meOrinetation = utils::getOrientation(aCand);
+
+                    // initialize with own orientation
+                    pNewHelper->mnDepth = (pNewHelper->meOrinetation == B2VectorOrientation::Negative ? -1 : 1);
+                }
+
+                for(a = 0; a < nCount - 1; a++)
+                {
+                    const B2DPolygon& aCandA(aCandidate.getB2DPolygon(a));
+                    StripHelper& rHelperA = aHelpers[a];
+
+                    for(b = a + 1; b < nCount; b++)
+                    {
+                        const B2DPolygon& aCandB(aCandidate.getB2DPolygon(b));
+                        StripHelper& rHelperB = aHelpers[b];
+                        const bool bAInB(rHelperB.maRange.isInside(rHelperA.maRange) && utils::isInside(aCandB, aCandA, true));
+
+                        if(bAInB)
+                        {
+                            // A is inside B, add orientation of B to A
+                            rHelperA.mnDepth += (rHelperB.meOrinetation == B2VectorOrientation::Negative ? -1 : 1);
+                        }
+
+                        const bool bBInA(rHelperA.maRange.isInside(rHelperB.maRange) && utils::isInside(aCandA, aCandB, true));
+
+                        if(bBInA)
+                        {
+                            // B is inside A, add orientation of A to B
+                            rHelperB.mnDepth += (rHelperA.meOrinetation == B2VectorOrientation::Negative ? -1 : 1);
+                        }
+                    }
+                }
+
+                const B2DPolyPolygon aSource(aCandidate);
+                aCandidate.clear();
+
+                for(a = 0; a < nCount; a++)
+                {
+                    const StripHelper& rHelper = aHelpers[a];
+                    // for contained unequal oriented polygons sum will be 0
+                    // for contained equal it will be >=2 or <=-2
+                    // for free polygons (not contained) it will be 1 or -1
+                    // -> accept all which are >=-1 && <= 1
+                    bool bAcceptEntry(rHelper.mnDepth >= -1 && rHelper.mnDepth <= 1);
+
+                    if(bAcceptEntry)
+                    {
+                        aCandidate.append(aSource.getB2DPolygon(a));
+                    }
+                }
+            }
+
+            return aCandidate;
+        }
+
+        B2DPolyPolygon stripDispensablePolygons(const B2DPolyPolygon& rCandidate, bool bKeepAboveZero)
+        {
+            const sal_uInt32 nCount(rCandidate.count());
+            B2DPolyPolygon aRetval;
+
+            if(nCount)
+            {
+                if(nCount == 1)
+                {
+                    if(!bKeepAboveZero && utils::getOrientation(rCandidate.getB2DPolygon(0)) == B2VectorOrientation::Positive)
+                    {
+                        aRetval = rCandidate;
+                    }
+                }
+                else
+                {
+                    sal_uInt32 a, b;
+                    std::vector< StripHelper > aHelpers;
+                    aHelpers.resize(nCount);
+
+                    for(a = 0; a < nCount; a++)
+                    {
+                        const B2DPolygon& aCandidate(rCandidate.getB2DPolygon(a));
+                        StripHelper* pNewHelper = &(aHelpers[a]);
+                        pNewHelper->maRange = utils::getRange(aCandidate);
+                        pNewHelper->meOrinetation = utils::getOrientation(aCandidate);
+                        pNewHelper->mnDepth = (pNewHelper->meOrinetation == B2VectorOrientation::Negative ? -1 : 0);
+                    }
+
+                    for(a = 0; a < nCount - 1; a++)
+                    {
+                        const B2DPolygon& aCandA(rCandidate.getB2DPolygon(a));
+                        StripHelper& rHelperA = aHelpers[a];
+
+                        for(b = a + 1; b < nCount; b++)
+                        {
+                            const B2DPolygon& aCandB(rCandidate.getB2DPolygon(b));
+                            StripHelper& rHelperB = aHelpers[b];
+                            const bool bAInB(rHelperB.maRange.isInside(rHelperA.maRange) && utils::isInside(aCandB, aCandA, true));
+                            const bool bBInA(rHelperA.maRange.isInside(rHelperB.maRange) && utils::isInside(aCandA, aCandB, true));
+
+                            if(bAInB && bBInA)
+                            {
+                                // congruent
+                                if(rHelperA.meOrinetation == rHelperB.meOrinetation)
+                                {
+                                    // two polys or two holes. Lower one of them to get one of them out of the way.
+                                    // Since each will be contained in the other one, both will be increased, too.
+                                    // So, for lowering, increase only one of them
+                                    rHelperA.mnDepth++;
+                                }
+                                else
+                                {
+                                    // poly and hole. They neutralize, so get rid of both. Move securely below zero.
+                                    rHelperA.mnDepth = - static_cast<sal_Int32>(nCount);
+                                    rHelperB.mnDepth = - static_cast<sal_Int32>(nCount);
+                                }
+                            }
+                            else
+                            {
+                                if(bAInB)
+                                {
+                                    if(rHelperB.meOrinetation == B2VectorOrientation::Negative)
+                                    {
+                                        rHelperA.mnDepth--;
+                                    }
+                                    else
+                                    {
+                                        rHelperA.mnDepth++;
+                                    }
+                                }
+                                else if(bBInA)
+                                {
+                                    if(rHelperA.meOrinetation == B2VectorOrientation::Negative)
+                                    {
+                                        rHelperB.mnDepth--;
+                                    }
+                                    else
+                                    {
+                                        rHelperB.mnDepth++;
+                                    }
+                                }
+                            }
+                        }
+                    }
+
+                    for(a = 0; a < nCount; a++)
+                    {
+                        const StripHelper& rHelper = aHelpers[a];
+                        bool bAcceptEntry(bKeepAboveZero ? 1 <= rHelper.mnDepth : rHelper.mnDepth == 0);
+
+                        if(bAcceptEntry)
+                        {
+                            aRetval.append(rCandidate.getB2DPolygon(a));
+                        }
+                    }
+                }
+            }
+
+            return aRetval;
+        }
+
+        B2DPolyPolygon prepareForPolygonOperation(const B2DPolygon& rCandidate)
+        {
+            solver aSolver(rCandidate);
+            B2DPolyPolygon aRetval(stripNeutralPolygons(aSolver.getB2DPolyPolygon()));
+
+            return correctOrientations(aRetval);
+        }
+
+        B2DPolyPolygon prepareForPolygonOperation(const B2DPolyPolygon& rCandidate)
+        {
+            solver aSolver(rCandidate);
+            B2DPolyPolygon aRetval(stripNeutralPolygons(aSolver.getB2DPolyPolygon()));
+
+            return correctOrientations(aRetval);
+        }
+
+        B2DPolyPolygon solvePolygonOperationOr(const B2DPolyPolygon& rCandidateA, const B2DPolyPolygon& rCandidateB)
+        {
+            if(!rCandidateA.count())
+            {
+                return rCandidateB;
+            }
+            else if(!rCandidateB.count())
+            {
+                return rCandidateA;
+            }
+            else
+            {
+                // concatenate polygons, solve crossovers and throw away all sub-polygons
+                // which have a depth other than 0.
+                B2DPolyPolygon aRetval(rCandidateA);
+
+                aRetval.append(rCandidateB);
+                aRetval = solveCrossovers(aRetval);
+                aRetval = stripNeutralPolygons(aRetval);
+
+                return stripDispensablePolygons(aRetval);
+            }
+        }
+
+        B2DPolyPolygon solvePolygonOperationXor(const B2DPolyPolygon& rCandidateA, const B2DPolyPolygon& rCandidateB)
+        {
+            if(!rCandidateA.count())
+            {
+                return rCandidateB;
+            }
+            else if(!rCandidateB.count())
+            {
+                return rCandidateA;
+            }
+            else
+            {
+                // XOR is pretty simple: By definition it is the simple concatenation of
+                // the single polygons since we imply XOR fill rule. Make it intersection-free
+                // and correct orientations
+                B2DPolyPolygon aRetval(rCandidateA);
+
+                aRetval.append(rCandidateB);
+                aRetval = solveCrossovers(aRetval);
+                aRetval = stripNeutralPolygons(aRetval);
+
+                return correctOrientations(aRetval);
+            }
+        }
+
+        B2DPolyPolygon solvePolygonOperationAnd(const B2DPolyPolygon& rCandidateA, const B2DPolyPolygon& rCandidateB)
+        {
+            if(!rCandidateA.count())
+            {
+                return B2DPolyPolygon();
+            }
+            else if(!rCandidateB.count())
+            {
+                return B2DPolyPolygon();
+            }
+            else
+            {
+                // tdf#130150 shortcut & precision: If both are simple ranges,
+                // solve based on ranges
+                if(basegfx::utils::isRectangle(rCandidateA) && basegfx::utils::isRectangle(rCandidateB))
+                {
+                    // *if* both are ranges, AND always can be solved
+                    const basegfx::B2DRange aRangeA(rCandidateA.getB2DRange());
+                    const basegfx::B2DRange aRangeB(rCandidateB.getB2DRange());
+
+                    if(aRangeA.isInside(aRangeB))
+                    {
+                        // 2nd completely inside 1st -> 2nd is result of AND
+                        return rCandidateB;
+                    }
+
+                    if(aRangeB.isInside(aRangeA))
+                    {
+                        // 2nd completely inside 1st -> 2nd is result of AND
+                        return rCandidateA;
+                    }
+
+                    // solve by intersection
+                    basegfx::B2DRange aIntersect(aRangeA);
+                    aIntersect.intersect(aRangeB);
+
+                    if(aIntersect.isEmpty())
+                    {
+                        // no overlap -> empty polygon as result of AND
+                        return B2DPolyPolygon();
+                    }
+
+                    // create polygon result
+                    return B2DPolyPolygon(
+                        basegfx::utils::createPolygonFromRect(
+                            aIntersect));
+                }
+
+                // concatenate polygons, solve crossovers and throw away all sub-polygons
+                // with a depth of < 1. This means to keep all polygons where at least two
+                // polygons do overlap.
+                B2DPolyPolygon aRetval(rCandidateA);
+
+                aRetval.append(rCandidateB);
+                aRetval = solveCrossovers(aRetval);
+                aRetval = stripNeutralPolygons(aRetval);
+
+                return stripDispensablePolygons(aRetval, true);
+            }
+        }
+
+        B2DPolyPolygon solvePolygonOperationDiff(const B2DPolyPolygon& rCandidateA, const B2DPolyPolygon& rCandidateB)
+        {
+            if(!rCandidateA.count())
+            {
+                return B2DPolyPolygon();
+            }
+            else if(!rCandidateB.count())
+            {
+                return rCandidateA;
+            }
+            else
+            {
+                // Make B topologically to holes and append to A
+                B2DPolyPolygon aRetval(rCandidateB);
+
+                aRetval.flip();
+                aRetval.append(rCandidateA);
+
+                // solve crossovers and throw away all sub-polygons which have a
+                // depth other than 0.
+                aRetval = basegfx::utils::solveCrossovers(aRetval);
+                aRetval = basegfx::utils::stripNeutralPolygons(aRetval);
+
+                return basegfx::utils::stripDispensablePolygons(aRetval);
+            }
+        }
+
+        B2DPolyPolygon mergeToSinglePolyPolygon(const B2DPolyPolygonVector& rInput)
+        {
+            if(rInput.empty())
+                return B2DPolyPolygon();
+
+            // first step: prepareForPolygonOperation and simple merge of non-overlapping
+            // PolyPolygons for speedup; this is possible for the wanted OR-operation
+            B2DPolyPolygonVector aResult;
+            aResult.reserve(rInput.size());
+
+            for(const basegfx::B2DPolyPolygon & a : rInput)
+            {
+                const basegfx::B2DPolyPolygon aCandidate(prepareForPolygonOperation(a));
+
+                if(!aResult.empty())
+                {
+                    const B2DRange aCandidateRange(aCandidate.getB2DRange());
+                    bool bCouldMergeSimple(false);
+
+                    for(auto & b: aResult)
+                    {
+                        basegfx::B2DPolyPolygon aTarget(b);
+                        const B2DRange aTargetRange(aTarget.getB2DRange());
+
+                        if(!aCandidateRange.overlaps(aTargetRange))
+                        {
+                            aTarget.append(aCandidate);
+                            b = aTarget;
+                            bCouldMergeSimple = true;
+                            break;
+                        }
+                    }
+
+                    if(!bCouldMergeSimple)
+                    {
+                        aResult.push_back(aCandidate);
+                    }
+                }
+                else
+                {
+                    aResult.push_back(aCandidate);
+                }
+            }
+
+            // second step: melt pairwise to a single PolyPolygon
+            while(aResult.size() > 1)
+            {
+                B2DPolyPolygonVector aResult2;
+                aResult2.reserve((aResult.size() / 2) + 1);
+
+                for(size_t a(0); a < aResult.size(); a += 2)
+                {
+                    if(a + 1 < aResult.size())
+                    {
+                        // a pair for processing
+                        aResult2.push_back(solvePolygonOperationOr(aResult[a], aResult[a + 1]));
+                    }
+                    else
+                    {
+                        // last single PolyPolygon; copy to target to not lose it
+                        aResult2.push_back(aResult[a]);
+                    }
+                }
+
+                aResult = aResult2;
+            }
+
+            // third step: get result
+            if(aResult.size() == 1)
+            {
+                return aResult[0];
+            }
+
+            return B2DPolyPolygon();
+        }
+
+} // end of namespace
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */