    /* -*- 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
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     */

    #include <svgsvgnode.hxx>
    #include <drawinglayer/geometry/viewinformation2d.hxx>
    #include <drawinglayer/primitive2d/transformprimitive2d.hxx>
    #include <drawinglayer/primitive2d/maskprimitive2d.hxx>
    #include <basegfx/polygon/b2dpolygontools.hxx>
    #include <basegfx/polygon/b2dpolygon.hxx>
    #include <basegfx/matrix/b2dhommatrixtools.hxx>
    #include <drawinglayer/primitive2d/polygonprimitive2d.hxx>
    #include <drawinglayer/primitive2d/hiddengeometryprimitive2d.hxx>
    #include <svgdocument.hxx>

    namespace svgio
    {
        namespace svgreader
        {
            SvgSvgNode::SvgSvgNode(
                SvgDocument& rDocument,
                SvgNode* pParent)
            :   SvgNode(SVGTokenSvg, rDocument, pParent),
                maSvgStyleAttributes(*this),
                maSvgAspectRatio(),
                maX(),
                maY(),
                maWidth(),
                maHeight(),
                maVersion(),
                mbStyleAttributesInitialized(false) // #i125258#
            {
            }

            // #i125258#
            void SvgSvgNode::initializeStyleAttributes()
            {
                if(!mbStyleAttributesInitialized)
                {
                    // #i125258# determine if initial values need to be initialized with hard values
                    // for the case that this is the outmost SVG statement and it has no parent
                    // stale (CssStyle for svg may be defined)
                    bool bSetInitialValues(true);

                    if(getParent())
                    {
                        // #i125258# no initial values when it's a SVG element embedded in SVG
                        bSetInitialValues = false;
                    }

                    if(bSetInitialValues)
                    {
                        const SvgStyleAttributes* pStyles = getSvgStyleAttributes();

                        if(pStyles && pStyles->getParentStyle())
                        {
                            // SVG has a parent style (probably CssStyle), check if fill is set there anywhere
                            // already. If yes, do not set the default fill (black)
                            bool bFillSet(false);
                            const SvgStyleAttributes* pParentStyle = pStyles->getParentStyle();

                            while(pParentStyle && !bFillSet)
                            {
                                bFillSet = pParentStyle->isFillSet();
                                pParentStyle = pParentStyle->getParentStyle();
                            }

                            if(bFillSet)
                            {
                                // #125258# no initial values when SVG has a parent style at which a fill
                                // is already set
                                bSetInitialValues = false;
                            }
                        }
                    }

                    if(bSetInitialValues)
                    {
                        // #i125258# only set if not yet initialized (SvgSvgNode::parseAttribute is already done,
                        // just setting may revert an already set valid value)
                        if(!maSvgStyleAttributes.isFillSet())
                        {
                            // #i125258# initial fill is black (see SVG1.1 spec)
                            maSvgStyleAttributes.setFill(SvgPaint(basegfx::BColor(0.0, 0.0, 0.0), true, true));
                        }
                    }

                    mbStyleAttributesInitialized = true;
                }
            }

            SvgSvgNode::~SvgSvgNode()
            {
            }

            const SvgStyleAttributes* SvgSvgNode::getSvgStyleAttributes() const
            {
                // #i125258# svg node can have CssStyles, too, so check for it here
                return checkForCssStyle("svg", maSvgStyleAttributes);
            }

            void SvgSvgNode::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 SVGTokenStyle:
                    {
                        readLocalCssStyle(aContent);
                        break;
                    }
                    case SVGTokenViewBox:
                    {
                        const basegfx::B2DRange aRange(readViewBox(aContent, *this));

                        if(!aRange.isEmpty())
                        {
                            setViewBox(&aRange);
                        }
                        break;
                    }
                    case SVGTokenPreserveAspectRatio:
                    {
                        maSvgAspectRatio = readSvgAspectRatio(aContent);
                        break;
                    }
                    case SVGTokenX:
                    {
                        SvgNumber aNum;

                        if(readSingleNumber(aContent, aNum))
                        {
                            maX = aNum;
                        }
                        break;
                    }
                    case SVGTokenY:
                    {
                        SvgNumber aNum;

                        if(readSingleNumber(aContent, aNum))
                        {
                            maY = aNum;
                        }
                        break;
                    }
                    case SVGTokenWidth:
                    {
                        SvgNumber aNum;

                        if(readSingleNumber(aContent, aNum))
                        {
                            if(aNum.isPositive())
                            {
                                maWidth = aNum;
                            }
                        }
                        break;
                    }
                    case SVGTokenHeight:
                    {
                        SvgNumber aNum;

                        if(readSingleNumber(aContent, aNum))
                        {
                            if(aNum.isPositive())
                            {
                                maHeight = aNum;
                            }
                        }
                        break;
                    }
                    case SVGTokenVersion:
                    {
                        SvgNumber aNum;

                        if(readSingleNumber(aContent, aNum))
                        {
                            maVersion = aNum;
                        }
                        break;
                    }
                    default:
                    {
                        break;
                    }
                }
            }

            void SvgSvgNode::seekReferenceWidth(double& fWidth, bool& bHasFound) const
            {
                if (!getParent() || bHasFound)
                {
                    return;
                }
                const SvgSvgNode* pParentSvgSvgNode = nullptr;
                // enclosing svg might have relative width, need to cumulate them till they are
                // resolved somewhere up in the node tree
                double fPercentage(1.0);
                for(const SvgNode* pParent = getParent(); pParent && !bHasFound; pParent = pParent->getParent())
                {
                    // dynamic_cast results Null-pointer for not SvgSvgNode and so skips them in if condition
                    pParentSvgSvgNode = dynamic_cast< const SvgSvgNode* >(pParent);
                    if (pParentSvgSvgNode)
                    {
                        if (pParentSvgSvgNode->getViewBox())
                        {
                            // viewbox values are already in 'user unit'.
                            fWidth = pParentSvgSvgNode->getViewBox()->getWidth() * fPercentage;
                            bHasFound = true;
                        }
                        else
                        {
                            // take absolute value or cumulate percentage
                            if (pParentSvgSvgNode->getWidth().isSet())
                            {
                                if (Unit_percent == pParentSvgSvgNode->getWidth().getUnit())
                                {
                                    fPercentage *= pParentSvgSvgNode->getWidth().getNumber() * 0.01;
                                }
                                else
                                {
                                    fWidth = pParentSvgSvgNode->getWidth().solveNonPercentage(*pParentSvgSvgNode) * fPercentage;
                                    bHasFound = true;
                                }
                            } // not set => width=100% => factor 1, no need for else
                        }
                    }
                }
            }

            void SvgSvgNode::seekReferenceHeight(double& fHeight, bool& bHasFound) const
            {
                if (!getParent() || bHasFound)
                {
                    return;
                }
                const SvgSvgNode* pParentSvgSvgNode = nullptr;
                // enclosing svg might have relative width and height, need to cumulate them till they are
                // resolved somewhere up in the node tree
                double fPercentage(1.0);
                for(const SvgNode* pParent = getParent(); pParent && !bHasFound; pParent = pParent->getParent())
                {
                    // dynamic_cast results Null-pointer for not SvgSvgNode and so skips them in if condition
                    pParentSvgSvgNode = dynamic_cast< const SvgSvgNode* >(pParent);
                    if (pParentSvgSvgNode)
                    {
                        if (pParentSvgSvgNode->getViewBox())
                        {
                            // viewbox values are already in 'user unit'.
                            fHeight = pParentSvgSvgNode->getViewBox()->getHeight() * fPercentage;
                            bHasFound = true;
                        }
                        else
                        {
                            // take absolute value or cumulate percentage
                            if (pParentSvgSvgNode->getHeight().isSet())
                            {
                                if (Unit_percent == pParentSvgSvgNode->getHeight().getUnit())
                                {
                                    fPercentage *= pParentSvgSvgNode->getHeight().getNumber() * 0.01;
                                }
                                else
                                {
                                    fHeight = pParentSvgSvgNode->getHeight().solveNonPercentage(*pParentSvgSvgNode) * fPercentage;
                                    bHasFound = true;
                                }
                            } // not set => height=100% => factor 1, no need for else
                        }
                    }
                }
            }

    // ToDo: Consider attribute overflow in method decomposeSvgNode
            void SvgSvgNode::decomposeSvgNode(drawinglayer::primitive2d::Primitive2DContainer& rTarget, bool bReferenced) const
            {
                drawinglayer::primitive2d::Primitive2DContainer aSequence;

                // #i125258# check now if we need to init some style settings locally. Do not do this
                // in the constructor, there is not yet information e.g. about existing CssStyles.
                // Here all nodes are read and interpreted
                const_cast< SvgSvgNode* >(this)->initializeStyleAttributes();

                // decompose children
                SvgNode::decomposeSvgNode(aSequence, bReferenced);

                if(!aSequence.empty())
                {
                    if(getParent())
                    {
                        // #i122594# if width/height is not given, it's 100% (see 5.1.2 The 'svg' element in SVG1.1 spec).
                        // If it is relative, the question is to what. The previous implementation assumed relative to the
                        // local ViewBox which is implied by (4.2 Basic data types):

                        // "Note that the non-property <length> definition also allows a percentage unit identifier.
                        // The meaning of a percentage length value depends on the attribute for which the percentage
                        // length value has been specified. Two common cases are: (a) when a percentage length value
                        // represents a percentage of the viewport width or height (refer to the section that discusses
                        // units in general), and (b) when a percentage length value represents a percentage of the
                        // bounding box width or height on a given object (refer to the section that describes object
                        // bounding box units)."

                        // Comparisons with common browsers show that it's mostly interpreted relative to the viewport
                        // of the parent, and so does the new implementation.

                        // Extract known viewport data
                        // bXXXIsAbsolute tracks whether relative values could be resolved to absolute values

                        // If width or height is not provided, the default 100% is used, see SVG 1.1 section 5.1.2
                        // value 0.0 here is only to initialize variable
                        bool bWidthIsAbsolute(getWidth().isSet() && Unit_percent != getWidth().getUnit());
                        double fW( bWidthIsAbsolute ? getWidth().solveNonPercentage(*this) : 0.0);

                        bool bHeightIsAbsolute(getHeight().isSet() && Unit_percent != getHeight().getUnit());
                        double fH( bHeightIsAbsolute ? getHeight().solveNonPercentage(*this) : 0.0);

                        // If x or y not provided, then default 0.0 is used, see SVG 1.1 Section 5.1.2
                        bool bXIsAbsolute((getX().isSet() && Unit_percent != getX().getUnit()) || !getX().isSet());
                        double fX( bXIsAbsolute && getX().isSet() ? getX().solveNonPercentage(*this) : 0.0);

                        bool bYIsAbsolute((getY().isSet() && Unit_percent != getY().getUnit()) || !getY().isSet());
                        double fY( bYIsAbsolute && getY().isSet() ? getY().solveNonPercentage(*this) : 0.0);

                        if ( !bXIsAbsolute || !bWidthIsAbsolute)
                        {
                            // get width of enclosing svg and resolve percentage in x and width;
                            double fWReference(0.0);
                            bool bHasFoundWidth(false);
                            seekReferenceWidth(fWReference, bHasFoundWidth);
                            if (!bHasFoundWidth)
                            {
                                if (getViewBox())
                                {
                                    fWReference = getViewBox()->getWidth();
                                }
                                else
                                {
                                    // Even outermost svg has not all information to resolve relative values,
                                    // I use content itself as fallback to set missing values for viewport
                                    // Any better idea for such ill structured svg documents?
                                    const basegfx::B2DRange aChildRange(
                                                aSequence.getB2DRange(
                                                    drawinglayer::geometry::ViewInformation2D()));
                                    fWReference = aChildRange.getWidth();
                                }
                            }
                            // referenced values are already in 'user unit'
                            if (!bXIsAbsolute)
                            {
                                fX = getX().getNumber() * 0.01 * fWReference;
                            }
                            if (!bWidthIsAbsolute)
                            {
                                fW = (getWidth().isSet() ? getWidth().getNumber() *0.01 : 1.0) * fWReference;
                            }
                        }

                        if ( !bYIsAbsolute || !bHeightIsAbsolute)
                        {
                            // get height of enclosing svg and resolve percentage in y and height
                            double fHReference(0.0);
                            bool bHasFoundHeight(false);
                            seekReferenceHeight(fHReference, bHasFoundHeight);
                            if (!bHasFoundHeight)
                            {
                                if (getViewBox())
                                {
                                    fHReference = getViewBox()->getHeight();
                                }
                                else
                                {
                                // Even outermost svg has not all information to resolve relative values,
                                    // I use content itself as fallback to set missing values for viewport
                                    // Any better idea for such ill structured svg documents?
                                    const basegfx::B2DRange aChildRange(
                                            aSequence.getB2DRange(
                                                drawinglayer::geometry::ViewInformation2D()));
                                    fHReference = aChildRange.getHeight();
                                }
                            }

                            // referenced values are already in 'user unit'
                            if (!bYIsAbsolute)
                            {
                                fY = getY().getNumber() * 0.01 * fHReference;
                            }
                            if (!bHeightIsAbsolute)
                            {
                                fH = (getHeight().isSet() ? getHeight().getNumber() *0.01 : 1.0) * fHReference;
                            }
                        }

                        if(getViewBox())
                        {
                            // SVG 1.1 defines in section 7.7 that a negative value for width or height
                            // in viewBox is an error and that 0.0 disables rendering
                            if(basegfx::fTools::more(getViewBox()->getWidth(),0.0) && basegfx::fTools::more(getViewBox()->getHeight(),0.0))
                            {
                                // create target range homing x,y, width and height as calculated above
                                const basegfx::B2DRange aTarget(fX, fY, fX + fW, fY + fH);

                                if(aTarget.equal(*getViewBox()))
                                {
                                    // no mapping needed, append
                                    rTarget.append(aSequence);
                                }
                                else
                                {
                                    // create mapping
                                    // #i122610 SVG 1.1 defines in section 5.1.2 that if the attribute perserveAspectRatio is not specified,
                                    // then the effect is as if a value of 'xMidYMid meet' were specified.
                                    SvgAspectRatio aRatioDefault(Align_xMidYMid,true);
                                    const SvgAspectRatio& rRatio = getSvgAspectRatio().isSet()? getSvgAspectRatio() : aRatioDefault;

                                    // let mapping be created from SvgAspectRatio
                                    const basegfx::B2DHomMatrix aEmbeddingTransform(
                                        rRatio.createMapping(aTarget, *getViewBox()));

                                    // prepare embedding in transformation
                                    const drawinglayer::primitive2d::Primitive2DReference xRef(
                                        new drawinglayer::primitive2d::TransformPrimitive2D(
                                            aEmbeddingTransform,
                                            aSequence));

                                    if(rRatio.isMeetOrSlice())
                                    {
                                        // embed in transformation
                                        rTarget.push_back(xRef);
                                    }
                                    else
                                    {
                                        // need to embed in MaskPrimitive2D, too
                                        const drawinglayer::primitive2d::Primitive2DReference xMask(
                                            new drawinglayer::primitive2d::MaskPrimitive2D(
                                                basegfx::B2DPolyPolygon(basegfx::utils::createPolygonFromRect(aTarget)),
                                                drawinglayer::primitive2d::Primitive2DContainer { xRef }));

                                        rTarget.push_back(xMask);
                                    }
                                }
                            }
                        }
                        else // no viewBox attribute
                        {
                            // Svg defines that a negative value is an error and that 0.0 disables rendering
                            if(basegfx::fTools::more(fW, 0.0) && basegfx::fTools::more(fH, 0.0))
                            {
                                if(!basegfx::fTools::equalZero(fX) || !basegfx::fTools::equalZero(fY))
                                {
                                    // embed in transform
                                    const drawinglayer::primitive2d::Primitive2DReference xRef(
                                        new drawinglayer::primitive2d::TransformPrimitive2D(
                                            basegfx::utils::createTranslateB2DHomMatrix(fX, fY),
                                            aSequence));

                                    aSequence = drawinglayer::primitive2d::Primitive2DContainer { xRef, };
                                }

                                // embed in MaskPrimitive2D to clip
                                const drawinglayer::primitive2d::Primitive2DReference xMask(
                                    new drawinglayer::primitive2d::MaskPrimitive2D(
                                        basegfx::B2DPolyPolygon(
                                            basegfx::utils::createPolygonFromRect(
                                                basegfx::B2DRange(fX, fY, fX + fW, fY + fH))),
                                        aSequence));

                                // append
                                rTarget.push_back(xMask);
                            }
                        }
                    }
                    else // Outermost SVG element
                    {
                        // Svg defines that a negative value is an error and that 0.0 disables rendering
                        // isPositive() not usable because it allows 0.0 in contrast to mathematical definition of 'positive'
                        const bool bWidthInvalid(getWidth().isSet() && basegfx::fTools::lessOrEqual(getWidth().getNumber(), 0.0));
                        const bool bHeightInvalid(getHeight().isSet() && basegfx::fTools::lessOrEqual(getHeight().getNumber(), 0.0));
                        if(!bWidthInvalid && !bHeightInvalid)
                        {
                            basegfx::B2DRange aSvgCanvasRange; // viewport
                            double fW = 0.0; // dummy values
                            double fH = 0.0;
                            if(getViewBox())
                            {
                                // SVG 1.1 defines in section 7.7 that a negative value for width or height
                                // in viewBox is an error and that 0.0 disables rendering
                                const double fViewBoxWidth = getViewBox()->getWidth();
                                const double fViewBoxHeight = getViewBox()->getHeight();
                                if(basegfx::fTools::more(fViewBoxWidth,0.0) && basegfx::fTools::more(fViewBoxHeight,0.0))
                                {
                                    // The intrinsic aspect ratio of the svg element is given by absolute values of svg width and svg height
                                    // or by the width and height of the viewBox, if svg width or svg height is relative.
                                    // see SVG 1.1 section 7.12
                                    bool bNeedsMapping(true);
                                    const bool bWidthIsAbsolute(getWidth().isSet() && Unit_percent != getWidth().getUnit());
                                    const bool bHeightIsAbsolute(getHeight().isSet() && Unit_percent != getHeight().getUnit());
                                    const double fViewBoxRatio(fViewBoxWidth/fViewBoxHeight);
                                    if(bWidthIsAbsolute && bHeightIsAbsolute)
                                    {
                                        fW = getWidth().solveNonPercentage(*this);
                                        fH = getHeight().solveNonPercentage(*this);
                                        aSvgCanvasRange = basegfx::B2DRange(0.0, 0.0, fW, fH);
                                    }
                                    else if (bWidthIsAbsolute)
                                    {
                                        fW = getWidth().solveNonPercentage(*this);
                                        fH = fW / fViewBoxRatio ;
                                        aSvgCanvasRange = basegfx::B2DRange(0.0, 0.0, fW, fH);
                                    }
                                    else if (bHeightIsAbsolute)
                                    {
                                        fH = getHeight().solveNonPercentage(*this);
                                        fW = fH * fViewBoxRatio ;
                                        aSvgCanvasRange = basegfx::B2DRange(0.0, 0.0, fW, fH);
                                    }
                                    else
                                    {
                                        // There exists no parent to resolve relative width or height.
                                        // Use child size as fallback and expand to aspect ratio given
                                        // by the viewBox. No mapping.
                                        // We get viewport >= content, therefore no clipping.
                                        bNeedsMapping = false;

                                        const basegfx::B2DRange aChildRange(
                                            aSequence.getB2DRange(
                                                drawinglayer::geometry::ViewInformation2D()));

                                        const double fChildWidth(getViewBox() ? getViewBox()->getWidth() : aChildRange.getWidth());
                                        const double fChildHeight(getViewBox() ? getViewBox()->getHeight() : aChildRange.getHeight());
                                        const double fLeft(getViewBox() ? getViewBox()->getMinX()  : aChildRange.getMinX());
                                        const double fTop (getViewBox() ? getViewBox()->getMinY() : aChildRange.getMinY());
                                        if ( fChildWidth / fViewBoxWidth > fChildHeight / fViewBoxHeight )
                                        {  // expand y
                                            fW = fChildWidth;
                                            fH = fChildWidth / fViewBoxRatio;
                                        }
                                        else
                                        {  // expand x
                                            fH = fChildHeight;
                                            fW = fChildHeight * fViewBoxRatio;
                                        }
                                        aSvgCanvasRange = basegfx::B2DRange(fLeft, fTop, fLeft + fW, fTop + fH);
                                    }

                                    if (bNeedsMapping)
                                    {
                                        // create mapping
                                        // SVG 1.1 defines in section 5.1.2 that if the attribute perserveAspectRatio is not specified,
                                        // then the effect is as if a value of 'xMidYMid meet' were specified.
                                        SvgAspectRatio aRatioDefault(Align_xMidYMid,true);
                                        const SvgAspectRatio& rRatio = getSvgAspectRatio().isSet()? getSvgAspectRatio() : aRatioDefault;

                                        basegfx::B2DHomMatrix aViewBoxMapping;
                                        aViewBoxMapping = rRatio.createMapping(aSvgCanvasRange, *getViewBox());
                                        // no need to check ratio here for slice, the outermost Svg will
                                        // be clipped anyways (see below)

                                        // scale content to viewBox definitions
                                        const drawinglayer::primitive2d::Primitive2DReference xTransform(
                                            new drawinglayer::primitive2d::TransformPrimitive2D(
                                                aViewBoxMapping,
                                                aSequence));

                                        aSequence = drawinglayer::primitive2d::Primitive2DContainer { xTransform };
                                    }
                                }
                            }
                            else // no viewbox => no mapping
                            {
                                const bool bWidthIsAbsolute(getWidth().isSet() && Unit_percent != getWidth().getUnit());
                                const bool bHeightIsAbsolute(getHeight().isSet() && Unit_percent != getHeight().getUnit());
                                if (bWidthIsAbsolute && bHeightIsAbsolute)
                                {
                                    fW =getWidth().solveNonPercentage(*this);
                                    fH =getHeight().solveNonPercentage(*this);
                                    aSvgCanvasRange = basegfx::B2DRange(0.0, 0.0, fW, fH);
                                }
                                else
                                {
                                    // There exists no parent to resolve relative width or height.
                                    // Use child size as fallback. We get viewport >= content, therefore no clipping.
                                    const basegfx::B2DRange aChildRange(
                                         aSequence.getB2DRange(
                                             drawinglayer::geometry::ViewInformation2D()));
                                    const double fChildWidth(aChildRange.getWidth());
                                    const double fChildHeight(aChildRange.getHeight());
                                    const double fChildLeft(aChildRange.getMinX());
                                    const double fChildTop(aChildRange.getMinY());
                                    fW = bWidthIsAbsolute ? getWidth().solveNonPercentage(*this) : fChildWidth;
                                    fH = bHeightIsAbsolute ? getHeight().solveNonPercentage(*this) : fChildHeight;
                                    const double fLeft(bWidthIsAbsolute ? 0.0 : fChildLeft);
                                    const double fTop(bHeightIsAbsolute ? 0.0 : fChildTop);
                                    aSvgCanvasRange = basegfx::B2DRange(fLeft, fTop, fLeft+fW, fTop+fH);
                                }

                            }

                            // to be completely correct in Svg sense it is necessary to clip
                            // the whole content to the given canvas. I choose here to do this
                            // initially despite I found various examples of Svg files out there
                            // which have no correct values for this clipping. It's correct
                            // due to the Svg spec.

                            // different from Svg we have the possibility with primitives to get
                            // a correct bounding box for the geometry. Get it for evtl. taking action
                            const basegfx::B2DRange aContentRange(
                                aSequence.getB2DRange(
                                    drawinglayer::geometry::ViewInformation2D()));

                            if(aSvgCanvasRange.isInside(aContentRange))
                            {
                                // no clip needed, but an invisible HiddenGeometryPrimitive2D
                                // to allow getting the full Svg range using the primitive mechanisms.
                                // This is needed since e.g. an SdrObject using this as graphic will
                                // create a mapping transformation to exactly map the content to its
                                // real life size
                                const drawinglayer::primitive2d::Primitive2DReference xLine(
                                    new drawinglayer::primitive2d::PolygonHairlinePrimitive2D(
                                        basegfx::utils::createPolygonFromRect(
                                            aSvgCanvasRange),
                                        basegfx::BColor(0.0, 0.0, 0.0)));
                                const drawinglayer::primitive2d::Primitive2DReference xHidden(
                                    new drawinglayer::primitive2d::HiddenGeometryPrimitive2D(
                                        drawinglayer::primitive2d::Primitive2DContainer { xLine }));

                                aSequence.push_back(xHidden);
                            }
                            else if(aSvgCanvasRange.overlaps(aContentRange))
                            {
                                // Clip is necessary. This will make Svg images evtl. smaller
                                // than wanted from Svg (the free space which may be around it is
                                // conform to the Svg spec), but avoids an expensive and unnecessary
                                // clip. Keep the full Svg range here to get the correct mappings
                                // to objects using this. Optimizations can be done in the processors
                                const drawinglayer::primitive2d::Primitive2DReference xMask(
                                    new drawinglayer::primitive2d::MaskPrimitive2D(
                                        basegfx::B2DPolyPolygon(
                                            basegfx::utils::createPolygonFromRect(
                                                aSvgCanvasRange)),
                                        aSequence));

                                aSequence = drawinglayer::primitive2d::Primitive2DContainer { xMask };
                            }
                            else
                            {
                                // not inside, no overlap. Empty Svg
                                aSequence.clear();
                            }

                            if(!aSequence.empty())
                            {
                                // Another correction:
                                // If no Width/Height is set (usually done in
                                // <svg ... width="215.9mm" height="279.4mm" >) which
                                // is the case for own-Impress-exports, assume that
                                // the Units are already 100ThMM.
                                // Maybe only for own-Impress-exports, thus may need to be
                                // &&ed with getDocument().findSvgNodeById("ooo:meta_slides"),
                                // but does not need to be.
                                bool bEmbedInFinalTransformPxTo100ThMM(true);

                                if(getDocument().findSvgNodeById("ooo:meta_slides")
                                    && !getWidth().isSet()
                                    && !getHeight().isSet())
                                {
                                    bEmbedInFinalTransformPxTo100ThMM = false;
                                }

                                if(bEmbedInFinalTransformPxTo100ThMM)
                                {
                                    // embed in transform primitive to scale to 1/100th mm
                                    // where 1 inch == 25.4 mm to get from Svg coordinates (px) to
                                    // drawinglayer coordinates
                                    const double fScaleTo100thmm(25.4 * 100.0 / F_SVG_PIXEL_PER_INCH);
                                    const basegfx::B2DHomMatrix aTransform(
                                        basegfx::utils::createScaleB2DHomMatrix(
                                            fScaleTo100thmm,
                                            fScaleTo100thmm));

                                    const drawinglayer::primitive2d::Primitive2DReference xTransform(
                                        new drawinglayer::primitive2d::TransformPrimitive2D(
                                            aTransform,
                                            aSequence));

                                    aSequence = drawinglayer::primitive2d::Primitive2DContainer { xTransform };
                                }

                                // append to result
                                rTarget.append(aSequence);
                            }
                        }
                    }
                }

                if(aSequence.empty() && !getParent() && getViewBox())
                {
                    // tdf#118232 No geometry, Outermost SVG element and we have a ViewBox.
                    // Create a HiddenGeometry Primitive containing an expanded
                    // hairline geometry to have the size contained
                    const drawinglayer::primitive2d::Primitive2DReference xLine(
                        new drawinglayer::primitive2d::PolygonHairlinePrimitive2D(
                            basegfx::utils::createPolygonFromRect(
                                *getViewBox()),
                            basegfx::BColor(0.0, 0.0, 0.0)));
                    const drawinglayer::primitive2d::Primitive2DReference xHidden(
                        new drawinglayer::primitive2d::HiddenGeometryPrimitive2D(
                            drawinglayer::primitive2d::Primitive2DContainer { xLine }));

                    rTarget.push_back(xHidden);
                }
            }

            const basegfx::B2DRange SvgSvgNode::getCurrentViewPort() const
            {
                if(getViewBox())
                {
                    return *(getViewBox());
                }
                else // viewport should be given by x, y, width, and height
                {
                    // Extract known viewport data
                    // bXXXIsAbsolute tracks whether relative values could be resolved to absolute values
                    if (getParent())
                        {
                        // If width or height is not provided, the default 100% is used, see SVG 1.1 section 5.1.2
                        // value 0.0 here is only to initialize variable
                        bool bWidthIsAbsolute(getWidth().isSet() && Unit_percent != getWidth().getUnit());
                        double fW( bWidthIsAbsolute ? getWidth().solveNonPercentage(*this) : 0.0);
                        bool bHeightIsAbsolute(getHeight().isSet() && Unit_percent != getHeight().getUnit());
                        double fH( bHeightIsAbsolute ? getHeight().solveNonPercentage(*this) : 0.0);

                        // If x or y not provided, then default 0.0 is used, see SVG 1.1 Section 5.1.2
                        bool bXIsAbsolute((getX().isSet() && Unit_percent != getX().getUnit()) || !getX().isSet());
                        double fX( bXIsAbsolute && getX().isSet() ? getX().solveNonPercentage(*this) : 0.0);

                        bool bYIsAbsolute((getY().isSet() && Unit_percent != getY().getUnit()) || !getY().isSet());
                        double fY( bYIsAbsolute && getY().isSet() ? getY().solveNonPercentage(*this) : 0.0);

                        if (bXIsAbsolute && bYIsAbsolute && bWidthIsAbsolute && bHeightIsAbsolute)
                        {
                            return basegfx::B2DRange(fX, fY, fX+fW, fY+fH);
                        }
                        else // try to resolve relative values
                        {
                            if (!bXIsAbsolute || !bWidthIsAbsolute)
                            {
                                // get width of enclosing svg and resolve percentage in x and width
                                double fWReference(0.0);
                                bool bHasFoundWidth(false);
                                seekReferenceWidth(fWReference, bHasFoundWidth);
                                // referenced values are already in 'user unit'
                                if (!bXIsAbsolute && bHasFoundWidth)
                                {
                                    fX = getX().getNumber() * 0.01 * fWReference;
                                    bXIsAbsolute = true;
                                }
                                if (!bWidthIsAbsolute && bHasFoundWidth)
                                {
                                    fW = (getWidth().isSet() ? getWidth().getNumber() *0.01 : 1.0) * fWReference;
                                    bWidthIsAbsolute = true;
                                }
                            }
                            if (!bYIsAbsolute || !bHeightIsAbsolute)
                            {
                                // get height of enclosing svg and resolve percentage in y and height
                                double fHReference(0.0);
                                bool bHasFoundHeight(false);
                                seekReferenceHeight(fHReference, bHasFoundHeight);
                                // referenced values are already in 'user unit'
                                if (!bYIsAbsolute && bHasFoundHeight)
                                {
                                    fY = getY().getNumber() * 0.01 * fHReference;
                                    bYIsAbsolute = true;
                                }
                                if (!bHeightIsAbsolute && bHasFoundHeight)
                                {
                                    fH = (getHeight().isSet() ? getHeight().getNumber() *0.01 : 1.0) * fHReference;
                                    bHeightIsAbsolute = true;
                                }
                            }

                            if (bXIsAbsolute && bYIsAbsolute && bWidthIsAbsolute && bHeightIsAbsolute)
                            {
                                return basegfx::B2DRange(fX, fY, fX+fW, fY+fH);
                            }
                            else // relative values could not be resolved, there exists no fallback
                            {
                                return SvgNode::getCurrentViewPort();
                            }
                        }
                    }
                    else //outermost svg
                    {
                        // If width or height is not provided, the default would be 100%, see SVG 1.1 section 5.1.2
                        // But here it cannot be resolved and no fallback exists.
                        // SVG 1.1 defines in section 5.1.2 that x,y has no meaning for the outermost SVG element.
                        bool bWidthIsAbsolute(getWidth().isSet() && Unit_percent != getWidth().getUnit());
                        bool bHeightIsAbsolute(getHeight().isSet() && Unit_percent != getHeight().getUnit());
                        if (bWidthIsAbsolute && bHeightIsAbsolute)
                        {
                            double fW( getWidth().solveNonPercentage(*this) );
                            double fH( getHeight().solveNonPercentage(*this) );
                            return basegfx::B2DRange(0.0, 0.0, fW, fH);
                        }
                        else // no fallback exists
                        {
                                return SvgNode::getCurrentViewPort();
                        }
                    }
    // TODO: Is it possible to decompose and use the bounding box of the children, if even the
    //       outermost svg has no information to resolve percentage? Is it worth, how expensive is it?

                }
            }

        } // end of namespace svgreader
    } // end of namespace svgio

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V547 Expression 'getViewBox()' is always true.

↑ V547 Expression 'getViewBox()' is always true.

↑ V547 Expression 'getViewBox()' is always true.

↑ V547 Expression 'getViewBox()' is always true.