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832 | /* -*- 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/polygonprimitive2d.hxx>
#include <drawinglayer/primitive2d/hiddengeometryprimitive2d.hxx>
#include <svgdocument.hxx>
namespace svgio::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)
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 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<--- Variable 'fW' is assigned a value that is never used.
double fH = 0.0;<--- Variable 'fH' is assigned a value that is never used.
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() && 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 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 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 = 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,
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()))
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() && 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 svgio
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