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, 826 insertions, 0 deletions

diff --git a/svgio/source/svgreader/svgsvgnode.cxx b/svgio/source/svgreader/svgsvgnode.cxx
new file mode 100644
index 000000000..cd8d25df0
--- /dev/null
+++ b/svgio/source/svgreader/svgsvgnode.cxx
@@ -0,0 +1,826 @@
+/* -*- 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 <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/PolygonHairlinePrimitive2D.hxx>
+#include <drawinglayer/primitive2d/hiddengeometryprimitive2d.hxx>
+#include <o3tl/unit_conversion.hxx>
+#include <svgdocument.hxx>
+
+namespace svgio::svgreader
+{
+        SvgSvgNode::SvgSvgNode(
+            SvgDocument& rDocument,
+            SvgNode* pParent)
+        :   SvgNode(SVGToken::Svg, rDocument, pParent),
+            maSvgStyleAttributes(*this),
+            mbStyleAttributesInitialized(false) // #i125258#
+        {
+        }
+
+        // #i125258#
+        void SvgSvgNode::initializeStyleAttributes()
+        {
+            if(mbStyleAttributesInitialized)
+                return;
+
+            // #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 SVGToken::Style:
+                {
+                    readLocalCssStyle(aContent);
+                    break;
+                }
+                case SVGToken::ViewBox:
+                {
+                    const basegfx::B2DRange aRange(readViewBox(aContent, *this));
+
+                    if(!aRange.isEmpty())
+                    {
+                        setViewBox(&aRange);
+                    }
+                    break;
+                }
+                case SVGToken::PreserveAspectRatio:
+                {
+                    maSvgAspectRatio = readSvgAspectRatio(aContent);
+                    break;
+                }
+                case SVGToken::X:
+                {
+                    SvgNumber aNum;
+
+                    if(readSingleNumber(aContent, aNum))
+                    {
+                        maX = aNum;
+                    }
+                    break;
+                }
+                case SVGToken::Y:
+                {
+                    SvgNumber aNum;
+
+                    if(readSingleNumber(aContent, aNum))
+                    {
+                        maY = aNum;
+                    }
+                    break;
+                }
+                case SVGToken::Width:
+                {
+                    SvgNumber aNum;
+
+                    if(readSingleNumber(aContent, aNum))
+                    {
+                        if(aNum.isPositive())
+                        {
+                            maWidth = aNum;
+                        }
+                    }
+                    break;
+                }
+                case SVGToken::Height:
+                {
+                    SvgNumber aNum;
+
+                    if(readSingleNumber(aContent, aNum))
+                    {
+                        if(aNum.isPositive())
+                        {
+                            maHeight = aNum;
+                        }
+                    }
+                    break;
+                }
+                case SVGToken::Version:
+                {
+                    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 (SvgUnit::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 (SvgUnit::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() && SvgUnit::percent != getWidth().getUnit());
+                    double fW( bWidthIsAbsolute ? getWidth().solveNonPercentage(*this) : 0.0);
+
+                    bool bHeightIsAbsolute(getHeight().isSet() && SvgUnit::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() && SvgUnit::percent != getX().getUnit()) || !getX().isSet());
+                    double fX( bXIsAbsolute && getX().isSet() ? getX().solveNonPercentage(*this) : 0.0);
+
+                    bool bYIsAbsolute((getY().isSet() && SvgUnit::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 preserveAspectRatio is not specified,
+                                // then the effect is as if a value of 'xMidYMid meet' were specified.
+                                SvgAspectRatio aRatioDefault(SvgAlign::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,
+                                        drawinglayer::primitive2d::Primitive2DContainer(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),
+                                        std::move(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))),
+                                    drawinglayer::primitive2d::Primitive2DContainer(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 (const basegfx::B2DRange* pBox = 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 = pBox->getWidth();
+                            const double fViewBoxHeight = pBox->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() && SvgUnit::percent != getWidth().getUnit());
+                                const bool bHeightIsAbsolute(getHeight().isSet() && SvgUnit::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 double fChildWidth(pBox->getWidth());
+                                    const double fChildHeight(pBox->getHeight());
+                                    const double fLeft(pBox->getMinX());
+                                    const double fTop(pBox->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 preserveAspectRatio is not specified,
+                                    // then the effect is as if a value of 'xMidYMid meet' were specified.
+                                    SvgAspectRatio aRatioDefault(SvgAlign::xMidYMid, true);
+                                    const SvgAspectRatio& rRatio = getSvgAspectRatio().isSet()? getSvgAspectRatio() : aRatioDefault;
+
+                                    basegfx::B2DHomMatrix aViewBoxMapping = rRatio.createMapping(aSvgCanvasRange, *pBox);
+                                    // 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,
+                                            std::move(aSequence)));
+
+                                    aSequence = drawinglayer::primitive2d::Primitive2DContainer { xTransform };
+                                }
+                            }
+                        }
+                        else // no viewbox => no mapping
+                        {
+                            const bool bWidthIsAbsolute(getWidth().isSet() && SvgUnit::percent != getWidth().getUnit());
+                            const bool bHeightIsAbsolute(getHeight().isSet() && SvgUnit::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)),
+                                    std::move(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
+                                // to get from Svg coordinates (px) to drawinglayer coordinates
+                                constexpr double fScaleTo100thmm(o3tl::convert(1.0, o3tl::Length::px, o3tl::Length::mm100));
+                                const basegfx::B2DHomMatrix aTransform(
+                                    basegfx::utils::createScaleB2DHomMatrix(
+                                        fScaleTo100thmm,
+                                        fScaleTo100thmm));
+
+                                const drawinglayer::primitive2d::Primitive2DReference xTransform(
+                                    new drawinglayer::primitive2d::TransformPrimitive2D(
+                                        aTransform,
+                                        std::move(aSequence)));
+
+                                aSequence = drawinglayer::primitive2d::Primitive2DContainer { xTransform };
+                            }
+
+                            // append to result
+                            rTarget.append(aSequence);
+                        }
+                    }
+                }
+            }
+
+            if(!(aSequence.empty() && !getParent() && getViewBox()))
+                return;
+
+            // 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);
+        }
+
+        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() && SvgUnit::percent != getWidth().getUnit());
+                    double fW( bWidthIsAbsolute ? getWidth().solveNonPercentage(*this) : 0.0);
+                    bool bHeightIsAbsolute(getHeight().isSet() && SvgUnit::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() && SvgUnit::percent != getX().getUnit()) || !getX().isSet());
+                    double fX( bXIsAbsolute && getX().isSet() ? getX().solveNonPercentage(*this) : 0.0);
+
+                    bool bYIsAbsolute((getY().isSet() && SvgUnit::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() && SvgUnit::percent != getWidth().getUnit());
+                    bool bHeightIsAbsolute(getHeight().isSet() && SvgUnit::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 svgio
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */